Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge branch 'for-next-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
* 'for-next-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
ib_srpt: Initial SRP Target merge for v3.3-rc1
+4672
+1
drivers/infiniband/Kconfig
+1
drivers/infiniband/Kconfig
+1
drivers/infiniband/Makefile
+1
drivers/infiniband/Makefile
+12
drivers/infiniband/ulp/srpt/Kconfig
+12
drivers/infiniband/ulp/srpt/Kconfig
···
1
+
config INFINIBAND_SRPT
2
+
tristate "InfiniBand SCSI RDMA Protocol target support"
3
+
depends on INFINIBAND && TARGET_CORE
4
+
---help---
5
+
6
+
Support for the SCSI RDMA Protocol (SRP) Target driver. The
7
+
SRP protocol is a protocol that allows an initiator to access
8
+
a block storage device on another host (target) over a network
9
+
that supports the RDMA protocol. Currently the RDMA protocol is
10
+
supported by InfiniBand and by iWarp network hardware. More
11
+
information about the SRP protocol can be found on the website
12
+
of the INCITS T10 technical committee (http://www.t10.org/).
+2
drivers/infiniband/ulp/srpt/Makefile
+2
drivers/infiniband/ulp/srpt/Makefile
+139
drivers/infiniband/ulp/srpt/ib_dm_mad.h
+139
drivers/infiniband/ulp/srpt/ib_dm_mad.h
···
1
+
/*
2
+
* Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
3
+
*
4
+
* This software is available to you under a choice of one of two
5
+
* licenses. You may choose to be licensed under the terms of the GNU
6
+
* General Public License (GPL) Version 2, available from the file
7
+
* COPYING in the main directory of this source tree, or the
8
+
* OpenIB.org BSD license below:
9
+
*
10
+
* Redistribution and use in source and binary forms, with or
11
+
* without modification, are permitted provided that the following
12
+
* conditions are met:
13
+
*
14
+
* - Redistributions of source code must retain the above
15
+
* copyright notice, this list of conditions and the following
16
+
* disclaimer.
17
+
*
18
+
* - Redistributions in binary form must reproduce the above
19
+
* copyright notice, this list of conditions and the following
20
+
* disclaimer in the documentation and/or other materials
21
+
* provided with the distribution.
22
+
*
23
+
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24
+
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25
+
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26
+
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27
+
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28
+
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29
+
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30
+
* SOFTWARE.
31
+
*
32
+
*/
33
+
34
+
#ifndef IB_DM_MAD_H
35
+
#define IB_DM_MAD_H
36
+
37
+
#include <linux/types.h>
38
+
39
+
#include <rdma/ib_mad.h>
40
+
41
+
enum {
42
+
/*
43
+
* See also section 13.4.7 Status Field, table 115 MAD Common Status
44
+
* Field Bit Values and also section 16.3.1.1 Status Field in the
45
+
* InfiniBand Architecture Specification.
46
+
*/
47
+
DM_MAD_STATUS_UNSUP_METHOD = 0x0008,
48
+
DM_MAD_STATUS_UNSUP_METHOD_ATTR = 0x000c,
49
+
DM_MAD_STATUS_INVALID_FIELD = 0x001c,
50
+
DM_MAD_STATUS_NO_IOC = 0x0100,
51
+
52
+
/*
53
+
* See also the Device Management chapter, section 16.3.3 Attributes,
54
+
* table 279 Device Management Attributes in the InfiniBand
55
+
* Architecture Specification.
56
+
*/
57
+
DM_ATTR_CLASS_PORT_INFO = 0x01,
58
+
DM_ATTR_IOU_INFO = 0x10,
59
+
DM_ATTR_IOC_PROFILE = 0x11,
60
+
DM_ATTR_SVC_ENTRIES = 0x12
61
+
};
62
+
63
+
struct ib_dm_hdr {
64
+
u8 reserved[28];
65
+
};
66
+
67
+
/*
68
+
* Structure of management datagram sent by the SRP target implementation.
69
+
* Contains a management datagram header, reliable multi-packet transaction
70
+
* protocol (RMPP) header and ib_dm_hdr. Notes:
71
+
* - The SRP target implementation does not use RMPP or ib_dm_hdr when sending
72
+
* management datagrams.
73
+
* - The header size must be exactly 64 bytes (IB_MGMT_DEVICE_HDR), since this
74
+
* is the header size that is passed to ib_create_send_mad() in ib_srpt.c.
75
+
* - The maximum supported size for a management datagram when not using RMPP
76
+
* is 256 bytes -- 64 bytes header and 192 (IB_MGMT_DEVICE_DATA) bytes data.
77
+
*/
78
+
struct ib_dm_mad {
79
+
struct ib_mad_hdr mad_hdr;
80
+
struct ib_rmpp_hdr rmpp_hdr;
81
+
struct ib_dm_hdr dm_hdr;
82
+
u8 data[IB_MGMT_DEVICE_DATA];
83
+
};
84
+
85
+
/*
86
+
* IOUnitInfo as defined in section 16.3.3.3 IOUnitInfo of the InfiniBand
87
+
* Architecture Specification.
88
+
*/
89
+
struct ib_dm_iou_info {
90
+
__be16 change_id;
91
+
u8 max_controllers;
92
+
u8 op_rom;
93
+
u8 controller_list[128];
94
+
};
95
+
96
+
/*
97
+
* IOControllerprofile as defined in section 16.3.3.4 IOControllerProfile of
98
+
* the InfiniBand Architecture Specification.
99
+
*/
100
+
struct ib_dm_ioc_profile {
101
+
__be64 guid;
102
+
__be32 vendor_id;
103
+
__be32 device_id;
104
+
__be16 device_version;
105
+
__be16 reserved1;
106
+
__be32 subsys_vendor_id;
107
+
__be32 subsys_device_id;
108
+
__be16 io_class;
109
+
__be16 io_subclass;
110
+
__be16 protocol;
111
+
__be16 protocol_version;
112
+
__be16 service_conn;
113
+
__be16 initiators_supported;
114
+
__be16 send_queue_depth;
115
+
u8 reserved2;
116
+
u8 rdma_read_depth;
117
+
__be32 send_size;
118
+
__be32 rdma_size;
119
+
u8 op_cap_mask;
120
+
u8 svc_cap_mask;
121
+
u8 num_svc_entries;
122
+
u8 reserved3[9];
123
+
u8 id_string[64];
124
+
};
125
+
126
+
struct ib_dm_svc_entry {
127
+
u8 name[40];
128
+
__be64 id;
129
+
};
130
+
131
+
/*
132
+
* See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
133
+
* Specification. See also section B.7, table B.8 in the T10 SRP r16a document.
134
+
*/
135
+
struct ib_dm_svc_entries {
136
+
struct ib_dm_svc_entry service_entries[4];
137
+
};
138
+
139
+
#endif
+4073
drivers/infiniband/ulp/srpt/ib_srpt.c
+4073
drivers/infiniband/ulp/srpt/ib_srpt.c
···
1
+
/*
2
+
* Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
3
+
* Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>.
4
+
*
5
+
* This software is available to you under a choice of one of two
6
+
* licenses. You may choose to be licensed under the terms of the GNU
7
+
* General Public License (GPL) Version 2, available from the file
8
+
* COPYING in the main directory of this source tree, or the
9
+
* OpenIB.org BSD license below:
10
+
*
11
+
* Redistribution and use in source and binary forms, with or
12
+
* without modification, are permitted provided that the following
13
+
* conditions are met:
14
+
*
15
+
* - Redistributions of source code must retain the above
16
+
* copyright notice, this list of conditions and the following
17
+
* disclaimer.
18
+
*
19
+
* - Redistributions in binary form must reproduce the above
20
+
* copyright notice, this list of conditions and the following
21
+
* disclaimer in the documentation and/or other materials
22
+
* provided with the distribution.
23
+
*
24
+
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25
+
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26
+
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27
+
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28
+
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29
+
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30
+
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31
+
* SOFTWARE.
32
+
*
33
+
*/
34
+
35
+
#include <linux/module.h>
36
+
#include <linux/init.h>
37
+
#include <linux/slab.h>
38
+
#include <linux/err.h>
39
+
#include <linux/ctype.h>
40
+
#include <linux/kthread.h>
41
+
#include <linux/string.h>
42
+
#include <linux/delay.h>
43
+
#include <linux/atomic.h>
44
+
#include <scsi/scsi_tcq.h>
45
+
#include <target/configfs_macros.h>
46
+
#include <target/target_core_base.h>
47
+
#include <target/target_core_fabric_configfs.h>
48
+
#include <target/target_core_fabric.h>
49
+
#include <target/target_core_configfs.h>
50
+
#include "ib_srpt.h"
51
+
52
+
/* Name of this kernel module. */
53
+
#define DRV_NAME "ib_srpt"
54
+
#define DRV_VERSION "2.0.0"
55
+
#define DRV_RELDATE "2011-02-14"
56
+
57
+
#define SRPT_ID_STRING "Linux SRP target"
58
+
59
+
#undef pr_fmt
60
+
#define pr_fmt(fmt) DRV_NAME " " fmt
61
+
62
+
MODULE_AUTHOR("Vu Pham and Bart Van Assche");
63
+
MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
64
+
"v" DRV_VERSION " (" DRV_RELDATE ")");
65
+
MODULE_LICENSE("Dual BSD/GPL");
66
+
67
+
/*
68
+
* Global Variables
69
+
*/
70
+
71
+
static u64 srpt_service_guid;
72
+
static spinlock_t srpt_dev_lock; /* Protects srpt_dev_list. */
73
+
static struct list_head srpt_dev_list; /* List of srpt_device structures. */
74
+
75
+
static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
76
+
module_param(srp_max_req_size, int, 0444);
77
+
MODULE_PARM_DESC(srp_max_req_size,
78
+
"Maximum size of SRP request messages in bytes.");
79
+
80
+
static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
81
+
module_param(srpt_srq_size, int, 0444);
82
+
MODULE_PARM_DESC(srpt_srq_size,
83
+
"Shared receive queue (SRQ) size.");
84
+
85
+
static int srpt_get_u64_x(char *buffer, struct kernel_param *kp)
86
+
{
87
+
return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
88
+
}
89
+
module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
90
+
0444);
91
+
MODULE_PARM_DESC(srpt_service_guid,
92
+
"Using this value for ioc_guid, id_ext, and cm_listen_id"
93
+
" instead of using the node_guid of the first HCA.");
94
+
95
+
static struct ib_client srpt_client;
96
+
static struct target_fabric_configfs *srpt_target;
97
+
static void srpt_release_channel(struct srpt_rdma_ch *ch);
98
+
static int srpt_queue_status(struct se_cmd *cmd);
99
+
100
+
/**
101
+
* opposite_dma_dir() - Swap DMA_TO_DEVICE and DMA_FROM_DEVICE.
102
+
*/
103
+
static inline
104
+
enum dma_data_direction opposite_dma_dir(enum dma_data_direction dir)
105
+
{
106
+
switch (dir) {
107
+
case DMA_TO_DEVICE: return DMA_FROM_DEVICE;
108
+
case DMA_FROM_DEVICE: return DMA_TO_DEVICE;
109
+
default: return dir;
110
+
}
111
+
}
112
+
113
+
/**
114
+
* srpt_sdev_name() - Return the name associated with the HCA.
115
+
*
116
+
* Examples are ib0, ib1, ...
117
+
*/
118
+
static inline const char *srpt_sdev_name(struct srpt_device *sdev)
119
+
{
120
+
return sdev->device->name;
121
+
}
122
+
123
+
static enum rdma_ch_state srpt_get_ch_state(struct srpt_rdma_ch *ch)
124
+
{
125
+
unsigned long flags;
126
+
enum rdma_ch_state state;
127
+
128
+
spin_lock_irqsave(&ch->spinlock, flags);
129
+
state = ch->state;
130
+
spin_unlock_irqrestore(&ch->spinlock, flags);
131
+
return state;
132
+
}
133
+
134
+
static enum rdma_ch_state
135
+
srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new_state)
136
+
{
137
+
unsigned long flags;
138
+
enum rdma_ch_state prev;
139
+
140
+
spin_lock_irqsave(&ch->spinlock, flags);
141
+
prev = ch->state;
142
+
ch->state = new_state;
143
+
spin_unlock_irqrestore(&ch->spinlock, flags);
144
+
return prev;
145
+
}
146
+
147
+
/**
148
+
* srpt_test_and_set_ch_state() - Test and set the channel state.
149
+
*
150
+
* Returns true if and only if the channel state has been set to the new state.
151
+
*/
152
+
static bool
153
+
srpt_test_and_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state old,
154
+
enum rdma_ch_state new)
155
+
{
156
+
unsigned long flags;
157
+
enum rdma_ch_state prev;
158
+
159
+
spin_lock_irqsave(&ch->spinlock, flags);
160
+
prev = ch->state;
161
+
if (prev == old)
162
+
ch->state = new;
163
+
spin_unlock_irqrestore(&ch->spinlock, flags);
164
+
return prev == old;
165
+
}
166
+
167
+
/**
168
+
* srpt_event_handler() - Asynchronous IB event callback function.
169
+
*
170
+
* Callback function called by the InfiniBand core when an asynchronous IB
171
+
* event occurs. This callback may occur in interrupt context. See also
172
+
* section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
173
+
* Architecture Specification.
174
+
*/
175
+
static void srpt_event_handler(struct ib_event_handler *handler,
176
+
struct ib_event *event)
177
+
{
178
+
struct srpt_device *sdev;
179
+
struct srpt_port *sport;
180
+
181
+
sdev = ib_get_client_data(event->device, &srpt_client);
182
+
if (!sdev || sdev->device != event->device)
183
+
return;
184
+
185
+
pr_debug("ASYNC event= %d on device= %s\n", event->event,
186
+
srpt_sdev_name(sdev));
187
+
188
+
switch (event->event) {
189
+
case IB_EVENT_PORT_ERR:
190
+
if (event->element.port_num <= sdev->device->phys_port_cnt) {
191
+
sport = &sdev->port[event->element.port_num - 1];
192
+
sport->lid = 0;
193
+
sport->sm_lid = 0;
194
+
}
195
+
break;
196
+
case IB_EVENT_PORT_ACTIVE:
197
+
case IB_EVENT_LID_CHANGE:
198
+
case IB_EVENT_PKEY_CHANGE:
199
+
case IB_EVENT_SM_CHANGE:
200
+
case IB_EVENT_CLIENT_REREGISTER:
201
+
/* Refresh port data asynchronously. */
202
+
if (event->element.port_num <= sdev->device->phys_port_cnt) {
203
+
sport = &sdev->port[event->element.port_num - 1];
204
+
if (!sport->lid && !sport->sm_lid)
205
+
schedule_work(&sport->work);
206
+
}
207
+
break;
208
+
default:
209
+
printk(KERN_ERR "received unrecognized IB event %d\n",
210
+
event->event);
211
+
break;
212
+
}
213
+
}
214
+
215
+
/**
216
+
* srpt_srq_event() - SRQ event callback function.
217
+
*/
218
+
static void srpt_srq_event(struct ib_event *event, void *ctx)
219
+
{
220
+
printk(KERN_INFO "SRQ event %d\n", event->event);
221
+
}
222
+
223
+
/**
224
+
* srpt_qp_event() - QP event callback function.
225
+
*/
226
+
static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
227
+
{
228
+
pr_debug("QP event %d on cm_id=%p sess_name=%s state=%d\n",
229
+
event->event, ch->cm_id, ch->sess_name, srpt_get_ch_state(ch));
230
+
231
+
switch (event->event) {
232
+
case IB_EVENT_COMM_EST:
233
+
ib_cm_notify(ch->cm_id, event->event);
234
+
break;
235
+
case IB_EVENT_QP_LAST_WQE_REACHED:
236
+
if (srpt_test_and_set_ch_state(ch, CH_DRAINING,
237
+
CH_RELEASING))
238
+
srpt_release_channel(ch);
239
+
else
240
+
pr_debug("%s: state %d - ignored LAST_WQE.\n",
241
+
ch->sess_name, srpt_get_ch_state(ch));
242
+
break;
243
+
default:
244
+
printk(KERN_ERR "received unrecognized IB QP event %d\n",
245
+
event->event);
246
+
break;
247
+
}
248
+
}
249
+
250
+
/**
251
+
* srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure.
252
+
*
253
+
* @slot: one-based slot number.
254
+
* @value: four-bit value.
255
+
*
256
+
* Copies the lowest four bits of value in element slot of the array of four
257
+
* bit elements called c_list (controller list). The index slot is one-based.
258
+
*/
259
+
static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
260
+
{
261
+
u16 id;
262
+
u8 tmp;
263
+
264
+
id = (slot - 1) / 2;
265
+
if (slot & 0x1) {
266
+
tmp = c_list[id] & 0xf;
267
+
c_list[id] = (value << 4) | tmp;
268
+
} else {
269
+
tmp = c_list[id] & 0xf0;
270
+
c_list[id] = (value & 0xf) | tmp;
271
+
}
272
+
}
273
+
274
+
/**
275
+
* srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram.
276
+
*
277
+
* See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
278
+
* Specification.
279
+
*/
280
+
static void srpt_get_class_port_info(struct ib_dm_mad *mad)
281
+
{
282
+
struct ib_class_port_info *cif;
283
+
284
+
cif = (struct ib_class_port_info *)mad->data;
285
+
memset(cif, 0, sizeof *cif);
286
+
cif->base_version = 1;
287
+
cif->class_version = 1;
288
+
cif->resp_time_value = 20;
289
+
290
+
mad->mad_hdr.status = 0;
291
+
}
292
+
293
+
/**
294
+
* srpt_get_iou() - Write IOUnitInfo to a management datagram.
295
+
*
296
+
* See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
297
+
* Specification. See also section B.7, table B.6 in the SRP r16a document.
298
+
*/
299
+
static void srpt_get_iou(struct ib_dm_mad *mad)
300
+
{
301
+
struct ib_dm_iou_info *ioui;
302
+
u8 slot;
303
+
int i;
304
+
305
+
ioui = (struct ib_dm_iou_info *)mad->data;
306
+
ioui->change_id = __constant_cpu_to_be16(1);
307
+
ioui->max_controllers = 16;
308
+
309
+
/* set present for slot 1 and empty for the rest */
310
+
srpt_set_ioc(ioui->controller_list, 1, 1);
311
+
for (i = 1, slot = 2; i < 16; i++, slot++)
312
+
srpt_set_ioc(ioui->controller_list, slot, 0);
313
+
314
+
mad->mad_hdr.status = 0;
315
+
}
316
+
317
+
/**
318
+
* srpt_get_ioc() - Write IOControllerprofile to a management datagram.
319
+
*
320
+
* See also section 16.3.3.4 IOControllerProfile in the InfiniBand
321
+
* Architecture Specification. See also section B.7, table B.7 in the SRP
322
+
* r16a document.
323
+
*/
324
+
static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
325
+
struct ib_dm_mad *mad)
326
+
{
327
+
struct srpt_device *sdev = sport->sdev;
328
+
struct ib_dm_ioc_profile *iocp;
329
+
330
+
iocp = (struct ib_dm_ioc_profile *)mad->data;
331
+
332
+
if (!slot || slot > 16) {
333
+
mad->mad_hdr.status
334
+
= __constant_cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
335
+
return;
336
+
}
337
+
338
+
if (slot > 2) {
339
+
mad->mad_hdr.status
340
+
= __constant_cpu_to_be16(DM_MAD_STATUS_NO_IOC);
341
+
return;
342
+
}
343
+
344
+
memset(iocp, 0, sizeof *iocp);
345
+
strcpy(iocp->id_string, SRPT_ID_STRING);
346
+
iocp->guid = cpu_to_be64(srpt_service_guid);
347
+
iocp->vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
348
+
iocp->device_id = cpu_to_be32(sdev->dev_attr.vendor_part_id);
349
+
iocp->device_version = cpu_to_be16(sdev->dev_attr.hw_ver);
350
+
iocp->subsys_vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
351
+
iocp->subsys_device_id = 0x0;
352
+
iocp->io_class = __constant_cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
353
+
iocp->io_subclass = __constant_cpu_to_be16(SRP_IO_SUBCLASS);
354
+
iocp->protocol = __constant_cpu_to_be16(SRP_PROTOCOL);
355
+
iocp->protocol_version = __constant_cpu_to_be16(SRP_PROTOCOL_VERSION);
356
+
iocp->send_queue_depth = cpu_to_be16(sdev->srq_size);
357
+
iocp->rdma_read_depth = 4;
358
+
iocp->send_size = cpu_to_be32(srp_max_req_size);
359
+
iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
360
+
1U << 24));
361
+
iocp->num_svc_entries = 1;
362
+
iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
363
+
SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
364
+
365
+
mad->mad_hdr.status = 0;
366
+
}
367
+
368
+
/**
369
+
* srpt_get_svc_entries() - Write ServiceEntries to a management datagram.
370
+
*
371
+
* See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
372
+
* Specification. See also section B.7, table B.8 in the SRP r16a document.
373
+
*/
374
+
static void srpt_get_svc_entries(u64 ioc_guid,
375
+
u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
376
+
{
377
+
struct ib_dm_svc_entries *svc_entries;
378
+
379
+
WARN_ON(!ioc_guid);
380
+
381
+
if (!slot || slot > 16) {
382
+
mad->mad_hdr.status
383
+
= __constant_cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
384
+
return;
385
+
}
386
+
387
+
if (slot > 2 || lo > hi || hi > 1) {
388
+
mad->mad_hdr.status
389
+
= __constant_cpu_to_be16(DM_MAD_STATUS_NO_IOC);
390
+
return;
391
+
}
392
+
393
+
svc_entries = (struct ib_dm_svc_entries *)mad->data;
394
+
memset(svc_entries, 0, sizeof *svc_entries);
395
+
svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
396
+
snprintf(svc_entries->service_entries[0].name,
397
+
sizeof(svc_entries->service_entries[0].name),
398
+
"%s%016llx",
399
+
SRP_SERVICE_NAME_PREFIX,
400
+
ioc_guid);
401
+
402
+
mad->mad_hdr.status = 0;
403
+
}
404
+
405
+
/**
406
+
* srpt_mgmt_method_get() - Process a received management datagram.
407
+
* @sp: source port through which the MAD has been received.
408
+
* @rq_mad: received MAD.
409
+
* @rsp_mad: response MAD.
410
+
*/
411
+
static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
412
+
struct ib_dm_mad *rsp_mad)
413
+
{
414
+
u16 attr_id;
415
+
u32 slot;
416
+
u8 hi, lo;
417
+
418
+
attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
419
+
switch (attr_id) {
420
+
case DM_ATTR_CLASS_PORT_INFO:
421
+
srpt_get_class_port_info(rsp_mad);
422
+
break;
423
+
case DM_ATTR_IOU_INFO:
424
+
srpt_get_iou(rsp_mad);
425
+
break;
426
+
case DM_ATTR_IOC_PROFILE:
427
+
slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
428
+
srpt_get_ioc(sp, slot, rsp_mad);
429
+
break;
430
+
case DM_ATTR_SVC_ENTRIES:
431
+
slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
432
+
hi = (u8) ((slot >> 8) & 0xff);
433
+
lo = (u8) (slot & 0xff);
434
+
slot = (u16) ((slot >> 16) & 0xffff);
435
+
srpt_get_svc_entries(srpt_service_guid,
436
+
slot, hi, lo, rsp_mad);
437
+
break;
438
+
default:
439
+
rsp_mad->mad_hdr.status =
440
+
__constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
441
+
break;
442
+
}
443
+
}
444
+
445
+
/**
446
+
* srpt_mad_send_handler() - Post MAD-send callback function.
447
+
*/
448
+
static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
449
+
struct ib_mad_send_wc *mad_wc)
450
+
{
451
+
ib_destroy_ah(mad_wc->send_buf->ah);
452
+
ib_free_send_mad(mad_wc->send_buf);
453
+
}
454
+
455
+
/**
456
+
* srpt_mad_recv_handler() - MAD reception callback function.
457
+
*/
458
+
static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
459
+
struct ib_mad_recv_wc *mad_wc)
460
+
{
461
+
struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
462
+
struct ib_ah *ah;
463
+
struct ib_mad_send_buf *rsp;
464
+
struct ib_dm_mad *dm_mad;
465
+
466
+
if (!mad_wc || !mad_wc->recv_buf.mad)
467
+
return;
468
+
469
+
ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
470
+
mad_wc->recv_buf.grh, mad_agent->port_num);
471
+
if (IS_ERR(ah))
472
+
goto err;
473
+
474
+
BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
475
+
476
+
rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
477
+
mad_wc->wc->pkey_index, 0,
478
+
IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
479
+
GFP_KERNEL);
480
+
if (IS_ERR(rsp))
481
+
goto err_rsp;
482
+
483
+
rsp->ah = ah;
484
+
485
+
dm_mad = rsp->mad;
486
+
memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof *dm_mad);
487
+
dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
488
+
dm_mad->mad_hdr.status = 0;
489
+
490
+
switch (mad_wc->recv_buf.mad->mad_hdr.method) {
491
+
case IB_MGMT_METHOD_GET:
492
+
srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
493
+
break;
494
+
case IB_MGMT_METHOD_SET:
495
+
dm_mad->mad_hdr.status =
496
+
__constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
497
+
break;
498
+
default:
499
+
dm_mad->mad_hdr.status =
500
+
__constant_cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
501
+
break;
502
+
}
503
+
504
+
if (!ib_post_send_mad(rsp, NULL)) {
505
+
ib_free_recv_mad(mad_wc);
506
+
/* will destroy_ah & free_send_mad in send completion */
507
+
return;
508
+
}
509
+
510
+
ib_free_send_mad(rsp);
511
+
512
+
err_rsp:
513
+
ib_destroy_ah(ah);
514
+
err:
515
+
ib_free_recv_mad(mad_wc);
516
+
}
517
+
518
+
/**
519
+
* srpt_refresh_port() - Configure a HCA port.
520
+
*
521
+
* Enable InfiniBand management datagram processing, update the cached sm_lid,
522
+
* lid and gid values, and register a callback function for processing MADs
523
+
* on the specified port.
524
+
*
525
+
* Note: It is safe to call this function more than once for the same port.
526
+
*/
527
+
static int srpt_refresh_port(struct srpt_port *sport)
528
+
{
529
+
struct ib_mad_reg_req reg_req;
530
+
struct ib_port_modify port_modify;
531
+
struct ib_port_attr port_attr;
532
+
int ret;
533
+
534
+
memset(&port_modify, 0, sizeof port_modify);
535
+
port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
536
+
port_modify.clr_port_cap_mask = 0;
537
+
538
+
ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
539
+
if (ret)
540
+
goto err_mod_port;
541
+
542
+
ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
543
+
if (ret)
544
+
goto err_query_port;
545
+
546
+
sport->sm_lid = port_attr.sm_lid;
547
+
sport->lid = port_attr.lid;
548
+
549
+
ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid);
550
+
if (ret)
551
+
goto err_query_port;
552
+
553
+
if (!sport->mad_agent) {
554
+
memset(®_req, 0, sizeof reg_req);
555
+
reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
556
+
reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
557
+
set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
558
+
set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
559
+
560
+
sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
561
+
sport->port,
562
+
IB_QPT_GSI,
563
+
®_req, 0,
564
+
srpt_mad_send_handler,
565
+
srpt_mad_recv_handler,
566
+
sport);
567
+
if (IS_ERR(sport->mad_agent)) {
568
+
ret = PTR_ERR(sport->mad_agent);
569
+
sport->mad_agent = NULL;
570
+
goto err_query_port;
571
+
}
572
+
}
573
+
574
+
return 0;
575
+
576
+
err_query_port:
577
+
578
+
port_modify.set_port_cap_mask = 0;
579
+
port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
580
+
ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
581
+
582
+
err_mod_port:
583
+
584
+
return ret;
585
+
}
586
+
587
+
/**
588
+
* srpt_unregister_mad_agent() - Unregister MAD callback functions.
589
+
*
590
+
* Note: It is safe to call this function more than once for the same device.
591
+
*/
592
+
static void srpt_unregister_mad_agent(struct srpt_device *sdev)
593
+
{
594
+
struct ib_port_modify port_modify = {
595
+
.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
596
+
};
597
+
struct srpt_port *sport;
598
+
int i;
599
+
600
+
for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
601
+
sport = &sdev->port[i - 1];
602
+
WARN_ON(sport->port != i);
603
+
if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
604
+
printk(KERN_ERR "disabling MAD processing failed.\n");
605
+
if (sport->mad_agent) {
606
+
ib_unregister_mad_agent(sport->mad_agent);
607
+
sport->mad_agent = NULL;
608
+
}
609
+
}
610
+
}
611
+
612
+
/**
613
+
* srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
614
+
*/
615
+
static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
616
+
int ioctx_size, int dma_size,
617
+
enum dma_data_direction dir)
618
+
{
619
+
struct srpt_ioctx *ioctx;
620
+
621
+
ioctx = kmalloc(ioctx_size, GFP_KERNEL);
622
+
if (!ioctx)
623
+
goto err;
624
+
625
+
ioctx->buf = kmalloc(dma_size, GFP_KERNEL);
626
+
if (!ioctx->buf)
627
+
goto err_free_ioctx;
628
+
629
+
ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir);
630
+
if (ib_dma_mapping_error(sdev->device, ioctx->dma))
631
+
goto err_free_buf;
632
+
633
+
return ioctx;
634
+
635
+
err_free_buf:
636
+
kfree(ioctx->buf);
637
+
err_free_ioctx:
638
+
kfree(ioctx);
639
+
err:
640
+
return NULL;
641
+
}
642
+
643
+
/**
644
+
* srpt_free_ioctx() - Free an SRPT I/O context structure.
645
+
*/
646
+
static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
647
+
int dma_size, enum dma_data_direction dir)
648
+
{
649
+
if (!ioctx)
650
+
return;
651
+
652
+
ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir);
653
+
kfree(ioctx->buf);
654
+
kfree(ioctx);
655
+
}
656
+
657
+
/**
658
+
* srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
659
+
* @sdev: Device to allocate the I/O context ring for.
660
+
* @ring_size: Number of elements in the I/O context ring.
661
+
* @ioctx_size: I/O context size.
662
+
* @dma_size: DMA buffer size.
663
+
* @dir: DMA data direction.
664
+
*/
665
+
static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
666
+
int ring_size, int ioctx_size,
667
+
int dma_size, enum dma_data_direction dir)
668
+
{
669
+
struct srpt_ioctx **ring;
670
+
int i;
671
+
672
+
WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx)
673
+
&& ioctx_size != sizeof(struct srpt_send_ioctx));
674
+
675
+
ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL);
676
+
if (!ring)
677
+
goto out;
678
+
for (i = 0; i < ring_size; ++i) {
679
+
ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir);
680
+
if (!ring[i])
681
+
goto err;
682
+
ring[i]->index = i;
683
+
}
684
+
goto out;
685
+
686
+
err:
687
+
while (--i >= 0)
688
+
srpt_free_ioctx(sdev, ring[i], dma_size, dir);
689
+
kfree(ring);
690
+
out:
691
+
return ring;
692
+
}
693
+
694
+
/**
695
+
* srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
696
+
*/
697
+
static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
698
+
struct srpt_device *sdev, int ring_size,
699
+
int dma_size, enum dma_data_direction dir)
700
+
{
701
+
int i;
702
+
703
+
for (i = 0; i < ring_size; ++i)
704
+
srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir);
705
+
kfree(ioctx_ring);
706
+
}
707
+
708
+
/**
709
+
* srpt_get_cmd_state() - Get the state of a SCSI command.
710
+
*/
711
+
static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx)
712
+
{
713
+
enum srpt_command_state state;
714
+
unsigned long flags;
715
+
716
+
BUG_ON(!ioctx);
717
+
718
+
spin_lock_irqsave(&ioctx->spinlock, flags);
719
+
state = ioctx->state;
720
+
spin_unlock_irqrestore(&ioctx->spinlock, flags);
721
+
return state;
722
+
}
723
+
724
+
/**
725
+
* srpt_set_cmd_state() - Set the state of a SCSI command.
726
+
*
727
+
* Does not modify the state of aborted commands. Returns the previous command
728
+
* state.
729
+
*/
730
+
static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
731
+
enum srpt_command_state new)
732
+
{
733
+
enum srpt_command_state previous;
734
+
unsigned long flags;
735
+
736
+
BUG_ON(!ioctx);
737
+
738
+
spin_lock_irqsave(&ioctx->spinlock, flags);
739
+
previous = ioctx->state;
740
+
if (previous != SRPT_STATE_DONE)
741
+
ioctx->state = new;
742
+
spin_unlock_irqrestore(&ioctx->spinlock, flags);
743
+
744
+
return previous;
745
+
}
746
+
747
+
/**
748
+
* srpt_test_and_set_cmd_state() - Test and set the state of a command.
749
+
*
750
+
* Returns true if and only if the previous command state was equal to 'old'.
751
+
*/
752
+
static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
753
+
enum srpt_command_state old,
754
+
enum srpt_command_state new)
755
+
{
756
+
enum srpt_command_state previous;
757
+
unsigned long flags;
758
+
759
+
WARN_ON(!ioctx);
760
+
WARN_ON(old == SRPT_STATE_DONE);
761
+
WARN_ON(new == SRPT_STATE_NEW);
762
+
763
+
spin_lock_irqsave(&ioctx->spinlock, flags);
764
+
previous = ioctx->state;
765
+
if (previous == old)
766
+
ioctx->state = new;
767
+
spin_unlock_irqrestore(&ioctx->spinlock, flags);
768
+
return previous == old;
769
+
}
770
+
771
+
/**
772
+
* srpt_post_recv() - Post an IB receive request.
773
+
*/
774
+
static int srpt_post_recv(struct srpt_device *sdev,
775
+
struct srpt_recv_ioctx *ioctx)
776
+
{
777
+
struct ib_sge list;
778
+
struct ib_recv_wr wr, *bad_wr;
779
+
780
+
BUG_ON(!sdev);
781
+
wr.wr_id = encode_wr_id(SRPT_RECV, ioctx->ioctx.index);
782
+
783
+
list.addr = ioctx->ioctx.dma;
784
+
list.length = srp_max_req_size;
785
+
list.lkey = sdev->mr->lkey;
786
+
787
+
wr.next = NULL;
788
+
wr.sg_list = &list;
789
+
wr.num_sge = 1;
790
+
791
+
return ib_post_srq_recv(sdev->srq, &wr, &bad_wr);
792
+
}
793
+
794
+
/**
795
+
* srpt_post_send() - Post an IB send request.
796
+
*
797
+
* Returns zero upon success and a non-zero value upon failure.
798
+
*/
799
+
static int srpt_post_send(struct srpt_rdma_ch *ch,
800
+
struct srpt_send_ioctx *ioctx, int len)
801
+
{
802
+
struct ib_sge list;
803
+
struct ib_send_wr wr, *bad_wr;
804
+
struct srpt_device *sdev = ch->sport->sdev;
805
+
int ret;
806
+
807
+
atomic_inc(&ch->req_lim);
808
+
809
+
ret = -ENOMEM;
810
+
if (unlikely(atomic_dec_return(&ch->sq_wr_avail) < 0)) {
811
+
printk(KERN_WARNING "IB send queue full (needed 1)\n");
812
+
goto out;
813
+
}
814
+
815
+
ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, len,
816
+
DMA_TO_DEVICE);
817
+
818
+
list.addr = ioctx->ioctx.dma;
819
+
list.length = len;
820
+
list.lkey = sdev->mr->lkey;
821
+
822
+
wr.next = NULL;
823
+
wr.wr_id = encode_wr_id(SRPT_SEND, ioctx->ioctx.index);
824
+
wr.sg_list = &list;
825
+
wr.num_sge = 1;
826
+
wr.opcode = IB_WR_SEND;
827
+
wr.send_flags = IB_SEND_SIGNALED;
828
+
829
+
ret = ib_post_send(ch->qp, &wr, &bad_wr);
830
+
831
+
out:
832
+
if (ret < 0) {
833
+
atomic_inc(&ch->sq_wr_avail);
834
+
atomic_dec(&ch->req_lim);
835
+
}
836
+
return ret;
837
+
}
838
+
839
+
/**
840
+
* srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
841
+
* @ioctx: Pointer to the I/O context associated with the request.
842
+
* @srp_cmd: Pointer to the SRP_CMD request data.
843
+
* @dir: Pointer to the variable to which the transfer direction will be
844
+
* written.
845
+
* @data_len: Pointer to the variable to which the total data length of all
846
+
* descriptors in the SRP_CMD request will be written.
847
+
*
848
+
* This function initializes ioctx->nrbuf and ioctx->r_bufs.
849
+
*
850
+
* Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
851
+
* -ENOMEM when memory allocation fails and zero upon success.
852
+
*/
853
+
static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
854
+
struct srp_cmd *srp_cmd,
855
+
enum dma_data_direction *dir, u64 *data_len)
856
+
{
857
+
struct srp_indirect_buf *idb;
858
+
struct srp_direct_buf *db;
859
+
unsigned add_cdb_offset;
860
+
int ret;
861
+
862
+
/*
863
+
* The pointer computations below will only be compiled correctly
864
+
* if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
865
+
* whether srp_cmd::add_data has been declared as a byte pointer.
866
+
*/
867
+
BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0)
868
+
&& !__same_type(srp_cmd->add_data[0], (u8)0));
869
+
870
+
BUG_ON(!dir);
871
+
BUG_ON(!data_len);
872
+
873
+
ret = 0;
874
+
*data_len = 0;
875
+
876
+
/*
877
+
* The lower four bits of the buffer format field contain the DATA-IN
878
+
* buffer descriptor format, and the highest four bits contain the
879
+
* DATA-OUT buffer descriptor format.
880
+
*/
881
+
*dir = DMA_NONE;
882
+
if (srp_cmd->buf_fmt & 0xf)
883
+
/* DATA-IN: transfer data from target to initiator (read). */
884
+
*dir = DMA_FROM_DEVICE;
885
+
else if (srp_cmd->buf_fmt >> 4)
886
+
/* DATA-OUT: transfer data from initiator to target (write). */
887
+
*dir = DMA_TO_DEVICE;
888
+
889
+
/*
890
+
* According to the SRP spec, the lower two bits of the 'ADDITIONAL
891
+
* CDB LENGTH' field are reserved and the size in bytes of this field
892
+
* is four times the value specified in bits 3..7. Hence the "& ~3".
893
+
*/
894
+
add_cdb_offset = srp_cmd->add_cdb_len & ~3;
895
+
if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
896
+
((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
897
+
ioctx->n_rbuf = 1;
898
+
ioctx->rbufs = &ioctx->single_rbuf;
899
+
900
+
db = (struct srp_direct_buf *)(srp_cmd->add_data
901
+
+ add_cdb_offset);
902
+
memcpy(ioctx->rbufs, db, sizeof *db);
903
+
*data_len = be32_to_cpu(db->len);
904
+
} else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
905
+
((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
906
+
idb = (struct srp_indirect_buf *)(srp_cmd->add_data
907
+
+ add_cdb_offset);
908
+
909
+
ioctx->n_rbuf = be32_to_cpu(idb->table_desc.len) / sizeof *db;
910
+
911
+
if (ioctx->n_rbuf >
912
+
(srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
913
+
printk(KERN_ERR "received unsupported SRP_CMD request"
914
+
" type (%u out + %u in != %u / %zu)\n",
915
+
srp_cmd->data_out_desc_cnt,
916
+
srp_cmd->data_in_desc_cnt,
917
+
be32_to_cpu(idb->table_desc.len),
918
+
sizeof(*db));
919
+
ioctx->n_rbuf = 0;
920
+
ret = -EINVAL;
921
+
goto out;
922
+
}
923
+
924
+
if (ioctx->n_rbuf == 1)
925
+
ioctx->rbufs = &ioctx->single_rbuf;
926
+
else {
927
+
ioctx->rbufs =
928
+
kmalloc(ioctx->n_rbuf * sizeof *db, GFP_ATOMIC);
929
+
if (!ioctx->rbufs) {
930
+
ioctx->n_rbuf = 0;
931
+
ret = -ENOMEM;
932
+
goto out;
933
+
}
934
+
}
935
+
936
+
db = idb->desc_list;
937
+
memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof *db);
938
+
*data_len = be32_to_cpu(idb->len);
939
+
}
940
+
out:
941
+
return ret;
942
+
}
943
+
944
+
/**
945
+
* srpt_init_ch_qp() - Initialize queue pair attributes.
946
+
*
947
+
* Initialized the attributes of queue pair 'qp' by allowing local write,
948
+
* remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
949
+
*/
950
+
static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
951
+
{
952
+
struct ib_qp_attr *attr;
953
+
int ret;
954
+
955
+
attr = kzalloc(sizeof *attr, GFP_KERNEL);
956
+
if (!attr)
957
+
return -ENOMEM;
958
+
959
+
attr->qp_state = IB_QPS_INIT;
960
+
attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
961
+
IB_ACCESS_REMOTE_WRITE;
962
+
attr->port_num = ch->sport->port;
963
+
attr->pkey_index = 0;
964
+
965
+
ret = ib_modify_qp(qp, attr,
966
+
IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
967
+
IB_QP_PKEY_INDEX);
968
+
969
+
kfree(attr);
970
+
return ret;
971
+
}
972
+
973
+
/**
974
+
* srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
975
+
* @ch: channel of the queue pair.
976
+
* @qp: queue pair to change the state of.
977
+
*
978
+
* Returns zero upon success and a negative value upon failure.
979
+
*
980
+
* Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
981
+
* If this structure ever becomes larger, it might be necessary to allocate
982
+
* it dynamically instead of on the stack.
983
+
*/
984
+
static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
985
+
{
986
+
struct ib_qp_attr qp_attr;
987
+
int attr_mask;
988
+
int ret;
989
+
990
+
qp_attr.qp_state = IB_QPS_RTR;
991
+
ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
992
+
if (ret)
993
+
goto out;
994
+
995
+
qp_attr.max_dest_rd_atomic = 4;
996
+
997
+
ret = ib_modify_qp(qp, &qp_attr, attr_mask);
998
+
999
+
out:
1000
+
return ret;
1001
+
}
1002
+
1003
+
/**
1004
+
* srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
1005
+
* @ch: channel of the queue pair.
1006
+
* @qp: queue pair to change the state of.
1007
+
*
1008
+
* Returns zero upon success and a negative value upon failure.
1009
+
*
1010
+
* Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1011
+
* If this structure ever becomes larger, it might be necessary to allocate
1012
+
* it dynamically instead of on the stack.
1013
+
*/
1014
+
static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1015
+
{
1016
+
struct ib_qp_attr qp_attr;
1017
+
int attr_mask;
1018
+
int ret;
1019
+
1020
+
qp_attr.qp_state = IB_QPS_RTS;
1021
+
ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1022
+
if (ret)
1023
+
goto out;
1024
+
1025
+
qp_attr.max_rd_atomic = 4;
1026
+
1027
+
ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1028
+
1029
+
out:
1030
+
return ret;
1031
+
}
1032
+
1033
+
/**
1034
+
* srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
1035
+
*/
1036
+
static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
1037
+
{
1038
+
struct ib_qp_attr qp_attr;
1039
+
1040
+
qp_attr.qp_state = IB_QPS_ERR;
1041
+
return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
1042
+
}
1043
+
1044
+
/**
1045
+
* srpt_unmap_sg_to_ib_sge() - Unmap an IB SGE list.
1046
+
*/
1047
+
static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch,
1048
+
struct srpt_send_ioctx *ioctx)
1049
+
{
1050
+
struct scatterlist *sg;
1051
+
enum dma_data_direction dir;
1052
+
1053
+
BUG_ON(!ch);
1054
+
BUG_ON(!ioctx);
1055
+
BUG_ON(ioctx->n_rdma && !ioctx->rdma_ius);
1056
+
1057
+
while (ioctx->n_rdma)
1058
+
kfree(ioctx->rdma_ius[--ioctx->n_rdma].sge);
1059
+
1060
+
kfree(ioctx->rdma_ius);
1061
+
ioctx->rdma_ius = NULL;
1062
+
1063
+
if (ioctx->mapped_sg_count) {
1064
+
sg = ioctx->sg;
1065
+
WARN_ON(!sg);
1066
+
dir = ioctx->cmd.data_direction;
1067
+
BUG_ON(dir == DMA_NONE);
1068
+
ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt,
1069
+
opposite_dma_dir(dir));
1070
+
ioctx->mapped_sg_count = 0;
1071
+
}
1072
+
}
1073
+
1074
+
/**
1075
+
* srpt_map_sg_to_ib_sge() - Map an SG list to an IB SGE list.
1076
+
*/
1077
+
static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
1078
+
struct srpt_send_ioctx *ioctx)
1079
+
{
1080
+
struct se_cmd *cmd;
1081
+
struct scatterlist *sg, *sg_orig;
1082
+
int sg_cnt;
1083
+
enum dma_data_direction dir;
1084
+
struct rdma_iu *riu;
1085
+
struct srp_direct_buf *db;
1086
+
dma_addr_t dma_addr;
1087
+
struct ib_sge *sge;
1088
+
u64 raddr;
1089
+
u32 rsize;
1090
+
u32 tsize;
1091
+
u32 dma_len;
1092
+
int count, nrdma;
1093
+
int i, j, k;
1094
+
1095
+
BUG_ON(!ch);
1096
+
BUG_ON(!ioctx);
1097
+
cmd = &ioctx->cmd;
1098
+
dir = cmd->data_direction;
1099
+
BUG_ON(dir == DMA_NONE);
1100
+
1101
+
transport_do_task_sg_chain(cmd);
1102
+
ioctx->sg = sg = sg_orig = cmd->t_tasks_sg_chained;
1103
+
ioctx->sg_cnt = sg_cnt = cmd->t_tasks_sg_chained_no;
1104
+
1105
+
count = ib_dma_map_sg(ch->sport->sdev->device, sg, sg_cnt,
1106
+
opposite_dma_dir(dir));
1107
+
if (unlikely(!count))
1108
+
return -EAGAIN;
1109
+
1110
+
ioctx->mapped_sg_count = count;
1111
+
1112
+
if (ioctx->rdma_ius && ioctx->n_rdma_ius)
1113
+
nrdma = ioctx->n_rdma_ius;
1114
+
else {
1115
+
nrdma = (count + SRPT_DEF_SG_PER_WQE - 1) / SRPT_DEF_SG_PER_WQE
1116
+
+ ioctx->n_rbuf;
1117
+
1118
+
ioctx->rdma_ius = kzalloc(nrdma * sizeof *riu, GFP_KERNEL);
1119
+
if (!ioctx->rdma_ius)
1120
+
goto free_mem;
1121
+
1122
+
ioctx->n_rdma_ius = nrdma;
1123
+
}
1124
+
1125
+
db = ioctx->rbufs;
1126
+
tsize = cmd->data_length;
1127
+
dma_len = sg_dma_len(&sg[0]);
1128
+
riu = ioctx->rdma_ius;
1129
+
1130
+
/*
1131
+
* For each remote desc - calculate the #ib_sge.
1132
+
* If #ib_sge < SRPT_DEF_SG_PER_WQE per rdma operation then
1133
+
* each remote desc rdma_iu is required a rdma wr;
1134
+
* else
1135
+
* we need to allocate extra rdma_iu to carry extra #ib_sge in
1136
+
* another rdma wr
1137
+
*/
1138
+
for (i = 0, j = 0;
1139
+
j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
1140
+
rsize = be32_to_cpu(db->len);
1141
+
raddr = be64_to_cpu(db->va);
1142
+
riu->raddr = raddr;
1143
+
riu->rkey = be32_to_cpu(db->key);
1144
+
riu->sge_cnt = 0;
1145
+
1146
+
/* calculate how many sge required for this remote_buf */
1147
+
while (rsize > 0 && tsize > 0) {
1148
+
1149
+
if (rsize >= dma_len) {
1150
+
tsize -= dma_len;
1151
+
rsize -= dma_len;
1152
+
raddr += dma_len;
1153
+
1154
+
if (tsize > 0) {
1155
+
++j;
1156
+
if (j < count) {
1157
+
sg = sg_next(sg);
1158
+
dma_len = sg_dma_len(sg);
1159
+
}
1160
+
}
1161
+
} else {
1162
+
tsize -= rsize;
1163
+
dma_len -= rsize;
1164
+
rsize = 0;
1165
+
}
1166
+
1167
+
++riu->sge_cnt;
1168
+
1169
+
if (rsize > 0 && riu->sge_cnt == SRPT_DEF_SG_PER_WQE) {
1170
+
++ioctx->n_rdma;
1171
+
riu->sge =
1172
+
kmalloc(riu->sge_cnt * sizeof *riu->sge,
1173
+
GFP_KERNEL);
1174
+
if (!riu->sge)
1175
+
goto free_mem;
1176
+
1177
+
++riu;
1178
+
riu->sge_cnt = 0;
1179
+
riu->raddr = raddr;
1180
+
riu->rkey = be32_to_cpu(db->key);
1181
+
}
1182
+
}
1183
+
1184
+
++ioctx->n_rdma;
1185
+
riu->sge = kmalloc(riu->sge_cnt * sizeof *riu->sge,
1186
+
GFP_KERNEL);
1187
+
if (!riu->sge)
1188
+
goto free_mem;
1189
+
}
1190
+
1191
+
db = ioctx->rbufs;
1192
+
tsize = cmd->data_length;
1193
+
riu = ioctx->rdma_ius;
1194
+
sg = sg_orig;
1195
+
dma_len = sg_dma_len(&sg[0]);
1196
+
dma_addr = sg_dma_address(&sg[0]);
1197
+
1198
+
/* this second loop is really mapped sg_addres to rdma_iu->ib_sge */
1199
+
for (i = 0, j = 0;
1200
+
j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
1201
+
rsize = be32_to_cpu(db->len);
1202
+
sge = riu->sge;
1203
+
k = 0;
1204
+
1205
+
while (rsize > 0 && tsize > 0) {
1206
+
sge->addr = dma_addr;
1207
+
sge->lkey = ch->sport->sdev->mr->lkey;
1208
+
1209
+
if (rsize >= dma_len) {
1210
+
sge->length =
1211
+
(tsize < dma_len) ? tsize : dma_len;
1212
+
tsize -= dma_len;
1213
+
rsize -= dma_len;
1214
+
1215
+
if (tsize > 0) {
1216
+
++j;
1217
+
if (j < count) {
1218
+
sg = sg_next(sg);
1219
+
dma_len = sg_dma_len(sg);
1220
+
dma_addr = sg_dma_address(sg);
1221
+
}
1222
+
}
1223
+
} else {
1224
+
sge->length = (tsize < rsize) ? tsize : rsize;
1225
+
tsize -= rsize;
1226
+
dma_len -= rsize;
1227
+
dma_addr += rsize;
1228
+
rsize = 0;
1229
+
}
1230
+
1231
+
++k;
1232
+
if (k == riu->sge_cnt && rsize > 0 && tsize > 0) {
1233
+
++riu;
1234
+
sge = riu->sge;
1235
+
k = 0;
1236
+
} else if (rsize > 0 && tsize > 0)
1237
+
++sge;
1238
+
}
1239
+
}
1240
+
1241
+
return 0;
1242
+
1243
+
free_mem:
1244
+
srpt_unmap_sg_to_ib_sge(ch, ioctx);
1245
+
1246
+
return -ENOMEM;
1247
+
}
1248
+
1249
+
/**
1250
+
* srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
1251
+
*/
1252
+
static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
1253
+
{
1254
+
struct srpt_send_ioctx *ioctx;
1255
+
unsigned long flags;
1256
+
1257
+
BUG_ON(!ch);
1258
+
1259
+
ioctx = NULL;
1260
+
spin_lock_irqsave(&ch->spinlock, flags);
1261
+
if (!list_empty(&ch->free_list)) {
1262
+
ioctx = list_first_entry(&ch->free_list,
1263
+
struct srpt_send_ioctx, free_list);
1264
+
list_del(&ioctx->free_list);
1265
+
}
1266
+
spin_unlock_irqrestore(&ch->spinlock, flags);
1267
+
1268
+
if (!ioctx)
1269
+
return ioctx;
1270
+
1271
+
BUG_ON(ioctx->ch != ch);
1272
+
kref_init(&ioctx->kref);
1273
+
spin_lock_init(&ioctx->spinlock);
1274
+
ioctx->state = SRPT_STATE_NEW;
1275
+
ioctx->n_rbuf = 0;
1276
+
ioctx->rbufs = NULL;
1277
+
ioctx->n_rdma = 0;
1278
+
ioctx->n_rdma_ius = 0;
1279
+
ioctx->rdma_ius = NULL;
1280
+
ioctx->mapped_sg_count = 0;
1281
+
init_completion(&ioctx->tx_done);
1282
+
ioctx->queue_status_only = false;
1283
+
/*
1284
+
* transport_init_se_cmd() does not initialize all fields, so do it
1285
+
* here.
1286
+
*/
1287
+
memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
1288
+
memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
1289
+
1290
+
return ioctx;
1291
+
}
1292
+
1293
+
/**
1294
+
* srpt_put_send_ioctx() - Free up resources.
1295
+
*/
1296
+
static void srpt_put_send_ioctx(struct srpt_send_ioctx *ioctx)
1297
+
{
1298
+
struct srpt_rdma_ch *ch;
1299
+
unsigned long flags;
1300
+
1301
+
BUG_ON(!ioctx);
1302
+
ch = ioctx->ch;
1303
+
BUG_ON(!ch);
1304
+
1305
+
WARN_ON(srpt_get_cmd_state(ioctx) != SRPT_STATE_DONE);
1306
+
1307
+
srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
1308
+
transport_generic_free_cmd(&ioctx->cmd, 0);
1309
+
1310
+
if (ioctx->n_rbuf > 1) {
1311
+
kfree(ioctx->rbufs);
1312
+
ioctx->rbufs = NULL;
1313
+
ioctx->n_rbuf = 0;
1314
+
}
1315
+
1316
+
spin_lock_irqsave(&ch->spinlock, flags);
1317
+
list_add(&ioctx->free_list, &ch->free_list);
1318
+
spin_unlock_irqrestore(&ch->spinlock, flags);
1319
+
}
1320
+
1321
+
static void srpt_put_send_ioctx_kref(struct kref *kref)
1322
+
{
1323
+
srpt_put_send_ioctx(container_of(kref, struct srpt_send_ioctx, kref));
1324
+
}
1325
+
1326
+
/**
1327
+
* srpt_abort_cmd() - Abort a SCSI command.
1328
+
* @ioctx: I/O context associated with the SCSI command.
1329
+
* @context: Preferred execution context.
1330
+
*/
1331
+
static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
1332
+
{
1333
+
enum srpt_command_state state;
1334
+
unsigned long flags;
1335
+
1336
+
BUG_ON(!ioctx);
1337
+
1338
+
/*
1339
+
* If the command is in a state where the target core is waiting for
1340
+
* the ib_srpt driver, change the state to the next state. Changing
1341
+
* the state of the command from SRPT_STATE_NEED_DATA to
1342
+
* SRPT_STATE_DATA_IN ensures that srpt_xmit_response() will call this
1343
+
* function a second time.
1344
+
*/
1345
+
1346
+
spin_lock_irqsave(&ioctx->spinlock, flags);
1347
+
state = ioctx->state;
1348
+
switch (state) {
1349
+
case SRPT_STATE_NEED_DATA:
1350
+
ioctx->state = SRPT_STATE_DATA_IN;
1351
+
break;
1352
+
case SRPT_STATE_DATA_IN:
1353
+
case SRPT_STATE_CMD_RSP_SENT:
1354
+
case SRPT_STATE_MGMT_RSP_SENT:
1355
+
ioctx->state = SRPT_STATE_DONE;
1356
+
break;
1357
+
default:
1358
+
break;
1359
+
}
1360
+
spin_unlock_irqrestore(&ioctx->spinlock, flags);
1361
+
1362
+
if (state == SRPT_STATE_DONE)
1363
+
goto out;
1364
+
1365
+
pr_debug("Aborting cmd with state %d and tag %lld\n", state,
1366
+
ioctx->tag);
1367
+
1368
+
switch (state) {
1369
+
case SRPT_STATE_NEW:
1370
+
case SRPT_STATE_DATA_IN:
1371
+
case SRPT_STATE_MGMT:
1372
+
/*
1373
+
* Do nothing - defer abort processing until
1374
+
* srpt_queue_response() is invoked.
1375
+
*/
1376
+
WARN_ON(!transport_check_aborted_status(&ioctx->cmd, false));
1377
+
break;
1378
+
case SRPT_STATE_NEED_DATA:
1379
+
/* DMA_TO_DEVICE (write) - RDMA read error. */
1380
+
atomic_set(&ioctx->cmd.transport_lun_stop, 1);
1381
+
transport_generic_handle_data(&ioctx->cmd);
1382
+
break;
1383
+
case SRPT_STATE_CMD_RSP_SENT:
1384
+
/*
1385
+
* SRP_RSP sending failed or the SRP_RSP send completion has
1386
+
* not been received in time.
1387
+
*/
1388
+
srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
1389
+
atomic_set(&ioctx->cmd.transport_lun_stop, 1);
1390
+
kref_put(&ioctx->kref, srpt_put_send_ioctx_kref);
1391
+
break;
1392
+
case SRPT_STATE_MGMT_RSP_SENT:
1393
+
srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1394
+
kref_put(&ioctx->kref, srpt_put_send_ioctx_kref);
1395
+
break;
1396
+
default:
1397
+
WARN_ON("ERROR: unexpected command state");
1398
+
break;
1399
+
}
1400
+
1401
+
out:
1402
+
return state;
1403
+
}
1404
+
1405
+
/**
1406
+
* srpt_handle_send_err_comp() - Process an IB_WC_SEND error completion.
1407
+
*/
1408
+
static void srpt_handle_send_err_comp(struct srpt_rdma_ch *ch, u64 wr_id)
1409
+
{
1410
+
struct srpt_send_ioctx *ioctx;
1411
+
enum srpt_command_state state;
1412
+
struct se_cmd *cmd;
1413
+
u32 index;
1414
+
1415
+
atomic_inc(&ch->sq_wr_avail);
1416
+
1417
+
index = idx_from_wr_id(wr_id);
1418
+
ioctx = ch->ioctx_ring[index];
1419
+
state = srpt_get_cmd_state(ioctx);
1420
+
cmd = &ioctx->cmd;
1421
+
1422
+
WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
1423
+
&& state != SRPT_STATE_MGMT_RSP_SENT
1424
+
&& state != SRPT_STATE_NEED_DATA
1425
+
&& state != SRPT_STATE_DONE);
1426
+
1427
+
/* If SRP_RSP sending failed, undo the ch->req_lim change. */
1428
+
if (state == SRPT_STATE_CMD_RSP_SENT
1429
+
|| state == SRPT_STATE_MGMT_RSP_SENT)
1430
+
atomic_dec(&ch->req_lim);
1431
+
1432
+
srpt_abort_cmd(ioctx);
1433
+
}
1434
+
1435
+
/**
1436
+
* srpt_handle_send_comp() - Process an IB send completion notification.
1437
+
*/
1438
+
static void srpt_handle_send_comp(struct srpt_rdma_ch *ch,
1439
+
struct srpt_send_ioctx *ioctx)
1440
+
{
1441
+
enum srpt_command_state state;
1442
+
1443
+
atomic_inc(&ch->sq_wr_avail);
1444
+
1445
+
state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1446
+
1447
+
if (WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
1448
+
&& state != SRPT_STATE_MGMT_RSP_SENT
1449
+
&& state != SRPT_STATE_DONE))
1450
+
pr_debug("state = %d\n", state);
1451
+
1452
+
if (state != SRPT_STATE_DONE)
1453
+
kref_put(&ioctx->kref, srpt_put_send_ioctx_kref);
1454
+
else
1455
+
printk(KERN_ERR "IB completion has been received too late for"
1456
+
" wr_id = %u.\n", ioctx->ioctx.index);
1457
+
}
1458
+
1459
+
/**
1460
+
* srpt_handle_rdma_comp() - Process an IB RDMA completion notification.
1461
+
*
1462
+
* Note: transport_generic_handle_data() is asynchronous so unmapping the
1463
+
* data that has been transferred via IB RDMA must be postponed until the
1464
+
* check_stop_free() callback.
1465
+
*/
1466
+
static void srpt_handle_rdma_comp(struct srpt_rdma_ch *ch,
1467
+
struct srpt_send_ioctx *ioctx,
1468
+
enum srpt_opcode opcode)
1469
+
{
1470
+
WARN_ON(ioctx->n_rdma <= 0);
1471
+
atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1472
+
1473
+
if (opcode == SRPT_RDMA_READ_LAST) {
1474
+
if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
1475
+
SRPT_STATE_DATA_IN))
1476
+
transport_generic_handle_data(&ioctx->cmd);
1477
+
else
1478
+
printk(KERN_ERR "%s[%d]: wrong state = %d\n", __func__,
1479
+
__LINE__, srpt_get_cmd_state(ioctx));
1480
+
} else if (opcode == SRPT_RDMA_ABORT) {
1481
+
ioctx->rdma_aborted = true;
1482
+
} else {
1483
+
WARN(true, "unexpected opcode %d\n", opcode);
1484
+
}
1485
+
}
1486
+
1487
+
/**
1488
+
* srpt_handle_rdma_err_comp() - Process an IB RDMA error completion.
1489
+
*/
1490
+
static void srpt_handle_rdma_err_comp(struct srpt_rdma_ch *ch,
1491
+
struct srpt_send_ioctx *ioctx,
1492
+
enum srpt_opcode opcode)
1493
+
{
1494
+
struct se_cmd *cmd;
1495
+
enum srpt_command_state state;
1496
+
1497
+
cmd = &ioctx->cmd;
1498
+
state = srpt_get_cmd_state(ioctx);
1499
+
switch (opcode) {
1500
+
case SRPT_RDMA_READ_LAST:
1501
+
if (ioctx->n_rdma <= 0) {
1502
+
printk(KERN_ERR "Received invalid RDMA read"
1503
+
" error completion with idx %d\n",
1504
+
ioctx->ioctx.index);
1505
+
break;
1506
+
}
1507
+
atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1508
+
if (state == SRPT_STATE_NEED_DATA)
1509
+
srpt_abort_cmd(ioctx);
1510
+
else
1511
+
printk(KERN_ERR "%s[%d]: wrong state = %d\n",
1512
+
__func__, __LINE__, state);
1513
+
break;
1514
+
case SRPT_RDMA_WRITE_LAST:
1515
+
atomic_set(&ioctx->cmd.transport_lun_stop, 1);
1516
+
break;
1517
+
default:
1518
+
printk(KERN_ERR "%s[%d]: opcode = %u\n", __func__,
1519
+
__LINE__, opcode);
1520
+
break;
1521
+
}
1522
+
}
1523
+
1524
+
/**
1525
+
* srpt_build_cmd_rsp() - Build an SRP_RSP response.
1526
+
* @ch: RDMA channel through which the request has been received.
1527
+
* @ioctx: I/O context associated with the SRP_CMD request. The response will
1528
+
* be built in the buffer ioctx->buf points at and hence this function will
1529
+
* overwrite the request data.
1530
+
* @tag: tag of the request for which this response is being generated.
1531
+
* @status: value for the STATUS field of the SRP_RSP information unit.
1532
+
*
1533
+
* Returns the size in bytes of the SRP_RSP response.
1534
+
*
1535
+
* An SRP_RSP response contains a SCSI status or service response. See also
1536
+
* section 6.9 in the SRP r16a document for the format of an SRP_RSP
1537
+
* response. See also SPC-2 for more information about sense data.
1538
+
*/
1539
+
static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
1540
+
struct srpt_send_ioctx *ioctx, u64 tag,
1541
+
int status)
1542
+
{
1543
+
struct srp_rsp *srp_rsp;
1544
+
const u8 *sense_data;
1545
+
int sense_data_len, max_sense_len;
1546
+
1547
+
/*
1548
+
* The lowest bit of all SAM-3 status codes is zero (see also
1549
+
* paragraph 5.3 in SAM-3).
1550
+
*/
1551
+
WARN_ON(status & 1);
1552
+
1553
+
srp_rsp = ioctx->ioctx.buf;
1554
+
BUG_ON(!srp_rsp);
1555
+
1556
+
sense_data = ioctx->sense_data;
1557
+
sense_data_len = ioctx->cmd.scsi_sense_length;
1558
+
WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
1559
+
1560
+
memset(srp_rsp, 0, sizeof *srp_rsp);
1561
+
srp_rsp->opcode = SRP_RSP;
1562
+
srp_rsp->req_lim_delta =
1563
+
__constant_cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
1564
+
srp_rsp->tag = tag;
1565
+
srp_rsp->status = status;
1566
+
1567
+
if (sense_data_len) {
1568
+
BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
1569
+
max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
1570
+
if (sense_data_len > max_sense_len) {
1571
+
printk(KERN_WARNING "truncated sense data from %d to %d"
1572
+
" bytes\n", sense_data_len, max_sense_len);
1573
+
sense_data_len = max_sense_len;
1574
+
}
1575
+
1576
+
srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
1577
+
srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
1578
+
memcpy(srp_rsp + 1, sense_data, sense_data_len);
1579
+
}
1580
+
1581
+
return sizeof(*srp_rsp) + sense_data_len;
1582
+
}
1583
+
1584
+
/**
1585
+
* srpt_build_tskmgmt_rsp() - Build a task management response.
1586
+
* @ch: RDMA channel through which the request has been received.
1587
+
* @ioctx: I/O context in which the SRP_RSP response will be built.
1588
+
* @rsp_code: RSP_CODE that will be stored in the response.
1589
+
* @tag: Tag of the request for which this response is being generated.
1590
+
*
1591
+
* Returns the size in bytes of the SRP_RSP response.
1592
+
*
1593
+
* An SRP_RSP response contains a SCSI status or service response. See also
1594
+
* section 6.9 in the SRP r16a document for the format of an SRP_RSP
1595
+
* response.
1596
+
*/
1597
+
static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
1598
+
struct srpt_send_ioctx *ioctx,
1599
+
u8 rsp_code, u64 tag)
1600
+
{
1601
+
struct srp_rsp *srp_rsp;
1602
+
int resp_data_len;
1603
+
int resp_len;
1604
+
1605
+
resp_data_len = (rsp_code == SRP_TSK_MGMT_SUCCESS) ? 0 : 4;
1606
+
resp_len = sizeof(*srp_rsp) + resp_data_len;
1607
+
1608
+
srp_rsp = ioctx->ioctx.buf;
1609
+
BUG_ON(!srp_rsp);
1610
+
memset(srp_rsp, 0, sizeof *srp_rsp);
1611
+
1612
+
srp_rsp->opcode = SRP_RSP;
1613
+
srp_rsp->req_lim_delta = __constant_cpu_to_be32(1
1614
+
+ atomic_xchg(&ch->req_lim_delta, 0));
1615
+
srp_rsp->tag = tag;
1616
+
1617
+
if (rsp_code != SRP_TSK_MGMT_SUCCESS) {
1618
+
srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
1619
+
srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
1620
+
srp_rsp->data[3] = rsp_code;
1621
+
}
1622
+
1623
+
return resp_len;
1624
+
}
1625
+
1626
+
#define NO_SUCH_LUN ((uint64_t)-1LL)
1627
+
1628
+
/*
1629
+
* SCSI LUN addressing method. See also SAM-2 and the section about
1630
+
* eight byte LUNs.
1631
+
*/
1632
+
enum scsi_lun_addr_method {
1633
+
SCSI_LUN_ADDR_METHOD_PERIPHERAL = 0,
1634
+
SCSI_LUN_ADDR_METHOD_FLAT = 1,
1635
+
SCSI_LUN_ADDR_METHOD_LUN = 2,
1636
+
SCSI_LUN_ADDR_METHOD_EXTENDED_LUN = 3,
1637
+
};
1638
+
1639
+
/*
1640
+
* srpt_unpack_lun() - Convert from network LUN to linear LUN.
1641
+
*
1642
+
* Convert an 2-byte, 4-byte, 6-byte or 8-byte LUN structure in network byte
1643
+
* order (big endian) to a linear LUN. Supports three LUN addressing methods:
1644
+
* peripheral, flat and logical unit. See also SAM-2, section 4.9.4 (page 40).
1645
+
*/
1646
+
static uint64_t srpt_unpack_lun(const uint8_t *lun, int len)
1647
+
{
1648
+
uint64_t res = NO_SUCH_LUN;
1649
+
int addressing_method;
1650
+
1651
+
if (unlikely(len < 2)) {
1652
+
printk(KERN_ERR "Illegal LUN length %d, expected 2 bytes or "
1653
+
"more", len);
1654
+
goto out;
1655
+
}
1656
+
1657
+
switch (len) {
1658
+
case 8:
1659
+
if ((*((__be64 *)lun) &
1660
+
__constant_cpu_to_be64(0x0000FFFFFFFFFFFFLL)) != 0)
1661
+
goto out_err;
1662
+
break;
1663
+
case 4:
1664
+
if (*((__be16 *)&lun[2]) != 0)
1665
+
goto out_err;
1666
+
break;
1667
+
case 6:
1668
+
if (*((__be32 *)&lun[2]) != 0)
1669
+
goto out_err;
1670
+
break;
1671
+
case 2:
1672
+
break;
1673
+
default:
1674
+
goto out_err;
1675
+
}
1676
+
1677
+
addressing_method = (*lun) >> 6; /* highest two bits of byte 0 */
1678
+
switch (addressing_method) {
1679
+
case SCSI_LUN_ADDR_METHOD_PERIPHERAL:
1680
+
case SCSI_LUN_ADDR_METHOD_FLAT:
1681
+
case SCSI_LUN_ADDR_METHOD_LUN:
1682
+
res = *(lun + 1) | (((*lun) & 0x3f) << 8);
1683
+
break;
1684
+
1685
+
case SCSI_LUN_ADDR_METHOD_EXTENDED_LUN:
1686
+
default:
1687
+
printk(KERN_ERR "Unimplemented LUN addressing method %u",
1688
+
addressing_method);
1689
+
break;
1690
+
}
1691
+
1692
+
out:
1693
+
return res;
1694
+
1695
+
out_err:
1696
+
printk(KERN_ERR "Support for multi-level LUNs has not yet been"
1697
+
" implemented");
1698
+
goto out;
1699
+
}
1700
+
1701
+
static int srpt_check_stop_free(struct se_cmd *cmd)
1702
+
{
1703
+
struct srpt_send_ioctx *ioctx;
1704
+
1705
+
ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
1706
+
return kref_put(&ioctx->kref, srpt_put_send_ioctx_kref);
1707
+
}
1708
+
1709
+
/**
1710
+
* srpt_handle_cmd() - Process SRP_CMD.
1711
+
*/
1712
+
static int srpt_handle_cmd(struct srpt_rdma_ch *ch,
1713
+
struct srpt_recv_ioctx *recv_ioctx,
1714
+
struct srpt_send_ioctx *send_ioctx)
1715
+
{
1716
+
struct se_cmd *cmd;
1717
+
struct srp_cmd *srp_cmd;
1718
+
uint64_t unpacked_lun;
1719
+
u64 data_len;
1720
+
enum dma_data_direction dir;
1721
+
int ret;
1722
+
1723
+
BUG_ON(!send_ioctx);
1724
+
1725
+
srp_cmd = recv_ioctx->ioctx.buf;
1726
+
kref_get(&send_ioctx->kref);
1727
+
cmd = &send_ioctx->cmd;
1728
+
send_ioctx->tag = srp_cmd->tag;
1729
+
1730
+
switch (srp_cmd->task_attr) {
1731
+
case SRP_CMD_SIMPLE_Q:
1732
+
cmd->sam_task_attr = MSG_SIMPLE_TAG;
1733
+
break;
1734
+
case SRP_CMD_ORDERED_Q:
1735
+
default:
1736
+
cmd->sam_task_attr = MSG_ORDERED_TAG;
1737
+
break;
1738
+
case SRP_CMD_HEAD_OF_Q:
1739
+
cmd->sam_task_attr = MSG_HEAD_TAG;
1740
+
break;
1741
+
case SRP_CMD_ACA:
1742
+
cmd->sam_task_attr = MSG_ACA_TAG;
1743
+
break;
1744
+
}
1745
+
1746
+
ret = srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &data_len);
1747
+
if (ret) {
1748
+
printk(KERN_ERR "0x%llx: parsing SRP descriptor table failed.\n",
1749
+
srp_cmd->tag);
1750
+
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1751
+
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1752
+
goto send_sense;
1753
+
}
1754
+
1755
+
cmd->data_length = data_len;
1756
+
cmd->data_direction = dir;
1757
+
unpacked_lun = srpt_unpack_lun((uint8_t *)&srp_cmd->lun,
1758
+
sizeof(srp_cmd->lun));
1759
+
if (transport_lookup_cmd_lun(cmd, unpacked_lun) < 0)
1760
+
goto send_sense;
1761
+
ret = transport_generic_allocate_tasks(cmd, srp_cmd->cdb);
1762
+
if (cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
1763
+
srpt_queue_status(cmd);
1764
+
else if (cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION)
1765
+
goto send_sense;
1766
+
else
1767
+
WARN_ON_ONCE(ret);
1768
+
1769
+
transport_handle_cdb_direct(cmd);
1770
+
return 0;
1771
+
1772
+
send_sense:
1773
+
transport_send_check_condition_and_sense(cmd, cmd->scsi_sense_reason,
1774
+
0);
1775
+
return -1;
1776
+
}
1777
+
1778
+
/**
1779
+
* srpt_rx_mgmt_fn_tag() - Process a task management function by tag.
1780
+
* @ch: RDMA channel of the task management request.
1781
+
* @fn: Task management function to perform.
1782
+
* @req_tag: Tag of the SRP task management request.
1783
+
* @mgmt_ioctx: I/O context of the task management request.
1784
+
*
1785
+
* Returns zero if the target core will process the task management
1786
+
* request asynchronously.
1787
+
*
1788
+
* Note: It is assumed that the initiator serializes tag-based task management
1789
+
* requests.
1790
+
*/
1791
+
static int srpt_rx_mgmt_fn_tag(struct srpt_send_ioctx *ioctx, u64 tag)
1792
+
{
1793
+
struct srpt_device *sdev;
1794
+
struct srpt_rdma_ch *ch;
1795
+
struct srpt_send_ioctx *target;
1796
+
int ret, i;
1797
+
1798
+
ret = -EINVAL;
1799
+
ch = ioctx->ch;
1800
+
BUG_ON(!ch);
1801
+
BUG_ON(!ch->sport);
1802
+
sdev = ch->sport->sdev;
1803
+
BUG_ON(!sdev);
1804
+
spin_lock_irq(&sdev->spinlock);
1805
+
for (i = 0; i < ch->rq_size; ++i) {
1806
+
target = ch->ioctx_ring[i];
1807
+
if (target->cmd.se_lun == ioctx->cmd.se_lun &&
1808
+
target->tag == tag &&
1809
+
srpt_get_cmd_state(target) != SRPT_STATE_DONE) {
1810
+
ret = 0;
1811
+
/* now let the target core abort &target->cmd; */
1812
+
break;
1813
+
}
1814
+
}
1815
+
spin_unlock_irq(&sdev->spinlock);
1816
+
return ret;
1817
+
}
1818
+
1819
+
static int srp_tmr_to_tcm(int fn)
1820
+
{
1821
+
switch (fn) {
1822
+
case SRP_TSK_ABORT_TASK:
1823
+
return TMR_ABORT_TASK;
1824
+
case SRP_TSK_ABORT_TASK_SET:
1825
+
return TMR_ABORT_TASK_SET;
1826
+
case SRP_TSK_CLEAR_TASK_SET:
1827
+
return TMR_CLEAR_TASK_SET;
1828
+
case SRP_TSK_LUN_RESET:
1829
+
return TMR_LUN_RESET;
1830
+
case SRP_TSK_CLEAR_ACA:
1831
+
return TMR_CLEAR_ACA;
1832
+
default:
1833
+
return -1;
1834
+
}
1835
+
}
1836
+
1837
+
/**
1838
+
* srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
1839
+
*
1840
+
* Returns 0 if and only if the request will be processed by the target core.
1841
+
*
1842
+
* For more information about SRP_TSK_MGMT information units, see also section
1843
+
* 6.7 in the SRP r16a document.
1844
+
*/
1845
+
static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
1846
+
struct srpt_recv_ioctx *recv_ioctx,
1847
+
struct srpt_send_ioctx *send_ioctx)
1848
+
{
1849
+
struct srp_tsk_mgmt *srp_tsk;
1850
+
struct se_cmd *cmd;
1851
+
uint64_t unpacked_lun;
1852
+
int tcm_tmr;
1853
+
int res;
1854
+
1855
+
BUG_ON(!send_ioctx);
1856
+
1857
+
srp_tsk = recv_ioctx->ioctx.buf;
1858
+
cmd = &send_ioctx->cmd;
1859
+
1860
+
pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld"
1861
+
" cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func,
1862
+
srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess);
1863
+
1864
+
srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
1865
+
send_ioctx->tag = srp_tsk->tag;
1866
+
tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
1867
+
if (tcm_tmr < 0) {
1868
+
send_ioctx->cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1869
+
send_ioctx->cmd.se_tmr_req->response =
1870
+
TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
1871
+
goto process_tmr;
1872
+
}
1873
+
cmd->se_tmr_req = core_tmr_alloc_req(cmd, NULL, tcm_tmr, GFP_KERNEL);
1874
+
if (!cmd->se_tmr_req) {
1875
+
send_ioctx->cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1876
+
send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
1877
+
goto process_tmr;
1878
+
}
1879
+
1880
+
unpacked_lun = srpt_unpack_lun((uint8_t *)&srp_tsk->lun,
1881
+
sizeof(srp_tsk->lun));
1882
+
res = transport_lookup_tmr_lun(&send_ioctx->cmd, unpacked_lun);
1883
+
if (res) {
1884
+
pr_debug("rejecting TMR for LUN %lld\n", unpacked_lun);
1885
+
send_ioctx->cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1886
+
send_ioctx->cmd.se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1887
+
goto process_tmr;
1888
+
}
1889
+
1890
+
if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK)
1891
+
srpt_rx_mgmt_fn_tag(send_ioctx, srp_tsk->task_tag);
1892
+
1893
+
process_tmr:
1894
+
kref_get(&send_ioctx->kref);
1895
+
if (!(send_ioctx->cmd.se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1896
+
transport_generic_handle_tmr(&send_ioctx->cmd);
1897
+
else
1898
+
transport_send_check_condition_and_sense(cmd,
1899
+
cmd->scsi_sense_reason, 0);
1900
+
1901
+
}
1902
+
1903
+
/**
1904
+
* srpt_handle_new_iu() - Process a newly received information unit.
1905
+
* @ch: RDMA channel through which the information unit has been received.
1906
+
* @ioctx: SRPT I/O context associated with the information unit.
1907
+
*/
1908
+
static void srpt_handle_new_iu(struct srpt_rdma_ch *ch,
1909
+
struct srpt_recv_ioctx *recv_ioctx,
1910
+
struct srpt_send_ioctx *send_ioctx)
1911
+
{
1912
+
struct srp_cmd *srp_cmd;
1913
+
enum rdma_ch_state ch_state;
1914
+
1915
+
BUG_ON(!ch);
1916
+
BUG_ON(!recv_ioctx);
1917
+
1918
+
ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
1919
+
recv_ioctx->ioctx.dma, srp_max_req_size,
1920
+
DMA_FROM_DEVICE);
1921
+
1922
+
ch_state = srpt_get_ch_state(ch);
1923
+
if (unlikely(ch_state == CH_CONNECTING)) {
1924
+
list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
1925
+
goto out;
1926
+
}
1927
+
1928
+
if (unlikely(ch_state != CH_LIVE))
1929
+
goto out;
1930
+
1931
+
srp_cmd = recv_ioctx->ioctx.buf;
1932
+
if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) {
1933
+
if (!send_ioctx)
1934
+
send_ioctx = srpt_get_send_ioctx(ch);
1935
+
if (unlikely(!send_ioctx)) {
1936
+
list_add_tail(&recv_ioctx->wait_list,
1937
+
&ch->cmd_wait_list);
1938
+
goto out;
1939
+
}
1940
+
}
1941
+
1942
+
transport_init_se_cmd(&send_ioctx->cmd, &srpt_target->tf_ops, ch->sess,
1943
+
0, DMA_NONE, MSG_SIMPLE_TAG,
1944
+
send_ioctx->sense_data);
1945
+
1946
+
switch (srp_cmd->opcode) {
1947
+
case SRP_CMD:
1948
+
srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
1949
+
break;
1950
+
case SRP_TSK_MGMT:
1951
+
srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
1952
+
break;
1953
+
case SRP_I_LOGOUT:
1954
+
printk(KERN_ERR "Not yet implemented: SRP_I_LOGOUT\n");
1955
+
break;
1956
+
case SRP_CRED_RSP:
1957
+
pr_debug("received SRP_CRED_RSP\n");
1958
+
break;
1959
+
case SRP_AER_RSP:
1960
+
pr_debug("received SRP_AER_RSP\n");
1961
+
break;
1962
+
case SRP_RSP:
1963
+
printk(KERN_ERR "Received SRP_RSP\n");
1964
+
break;
1965
+
default:
1966
+
printk(KERN_ERR "received IU with unknown opcode 0x%x\n",
1967
+
srp_cmd->opcode);
1968
+
break;
1969
+
}
1970
+
1971
+
srpt_post_recv(ch->sport->sdev, recv_ioctx);
1972
+
out:
1973
+
return;
1974
+
}
1975
+
1976
+
static void srpt_process_rcv_completion(struct ib_cq *cq,
1977
+
struct srpt_rdma_ch *ch,
1978
+
struct ib_wc *wc)
1979
+
{
1980
+
struct srpt_device *sdev = ch->sport->sdev;
1981
+
struct srpt_recv_ioctx *ioctx;
1982
+
u32 index;
1983
+
1984
+
index = idx_from_wr_id(wc->wr_id);
1985
+
if (wc->status == IB_WC_SUCCESS) {
1986
+
int req_lim;
1987
+
1988
+
req_lim = atomic_dec_return(&ch->req_lim);
1989
+
if (unlikely(req_lim < 0))
1990
+
printk(KERN_ERR "req_lim = %d < 0\n", req_lim);
1991
+
ioctx = sdev->ioctx_ring[index];
1992
+
srpt_handle_new_iu(ch, ioctx, NULL);
1993
+
} else {
1994
+
printk(KERN_INFO "receiving failed for idx %u with status %d\n",
1995
+
index, wc->status);
1996
+
}
1997
+
}
1998
+
1999
+
/**
2000
+
* srpt_process_send_completion() - Process an IB send completion.
2001
+
*
2002
+
* Note: Although this has not yet been observed during tests, at least in
2003
+
* theory it is possible that the srpt_get_send_ioctx() call invoked by
2004
+
* srpt_handle_new_iu() fails. This is possible because the req_lim_delta
2005
+
* value in each response is set to one, and it is possible that this response
2006
+
* makes the initiator send a new request before the send completion for that
2007
+
* response has been processed. This could e.g. happen if the call to
2008
+
* srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
2009
+
* if IB retransmission causes generation of the send completion to be
2010
+
* delayed. Incoming information units for which srpt_get_send_ioctx() fails
2011
+
* are queued on cmd_wait_list. The code below processes these delayed
2012
+
* requests one at a time.
2013
+
*/
2014
+
static void srpt_process_send_completion(struct ib_cq *cq,
2015
+
struct srpt_rdma_ch *ch,
2016
+
struct ib_wc *wc)
2017
+
{
2018
+
struct srpt_send_ioctx *send_ioctx;
2019
+
uint32_t index;
2020
+
enum srpt_opcode opcode;
2021
+
2022
+
index = idx_from_wr_id(wc->wr_id);
2023
+
opcode = opcode_from_wr_id(wc->wr_id);
2024
+
send_ioctx = ch->ioctx_ring[index];
2025
+
if (wc->status == IB_WC_SUCCESS) {
2026
+
if (opcode == SRPT_SEND)
2027
+
srpt_handle_send_comp(ch, send_ioctx);
2028
+
else {
2029
+
WARN_ON(opcode != SRPT_RDMA_ABORT &&
2030
+
wc->opcode != IB_WC_RDMA_READ);
2031
+
srpt_handle_rdma_comp(ch, send_ioctx, opcode);
2032
+
}
2033
+
} else {
2034
+
if (opcode == SRPT_SEND) {
2035
+
printk(KERN_INFO "sending response for idx %u failed"
2036
+
" with status %d\n", index, wc->status);
2037
+
srpt_handle_send_err_comp(ch, wc->wr_id);
2038
+
} else if (opcode != SRPT_RDMA_MID) {
2039
+
printk(KERN_INFO "RDMA t %d for idx %u failed with"
2040
+
" status %d", opcode, index, wc->status);
2041
+
srpt_handle_rdma_err_comp(ch, send_ioctx, opcode);
2042
+
}
2043
+
}
2044
+
2045
+
while (unlikely(opcode == SRPT_SEND
2046
+
&& !list_empty(&ch->cmd_wait_list)
2047
+
&& srpt_get_ch_state(ch) == CH_LIVE
2048
+
&& (send_ioctx = srpt_get_send_ioctx(ch)) != NULL)) {
2049
+
struct srpt_recv_ioctx *recv_ioctx;
2050
+
2051
+
recv_ioctx = list_first_entry(&ch->cmd_wait_list,
2052
+
struct srpt_recv_ioctx,
2053
+
wait_list);
2054
+
list_del(&recv_ioctx->wait_list);
2055
+
srpt_handle_new_iu(ch, recv_ioctx, send_ioctx);
2056
+
}
2057
+
}
2058
+
2059
+
static void srpt_process_completion(struct ib_cq *cq, struct srpt_rdma_ch *ch)
2060
+
{
2061
+
struct ib_wc *const wc = ch->wc;
2062
+
int i, n;
2063
+
2064
+
WARN_ON(cq != ch->cq);
2065
+
2066
+
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
2067
+
while ((n = ib_poll_cq(cq, ARRAY_SIZE(ch->wc), wc)) > 0) {
2068
+
for (i = 0; i < n; i++) {
2069
+
if (opcode_from_wr_id(wc[i].wr_id) == SRPT_RECV)
2070
+
srpt_process_rcv_completion(cq, ch, &wc[i]);
2071
+
else
2072
+
srpt_process_send_completion(cq, ch, &wc[i]);
2073
+
}
2074
+
}
2075
+
}
2076
+
2077
+
/**
2078
+
* srpt_completion() - IB completion queue callback function.
2079
+
*
2080
+
* Notes:
2081
+
* - It is guaranteed that a completion handler will never be invoked
2082
+
* concurrently on two different CPUs for the same completion queue. See also
2083
+
* Documentation/infiniband/core_locking.txt and the implementation of
2084
+
* handle_edge_irq() in kernel/irq/chip.c.
2085
+
* - When threaded IRQs are enabled, completion handlers are invoked in thread
2086
+
* context instead of interrupt context.
2087
+
*/
2088
+
static void srpt_completion(struct ib_cq *cq, void *ctx)
2089
+
{
2090
+
struct srpt_rdma_ch *ch = ctx;
2091
+
2092
+
wake_up_interruptible(&ch->wait_queue);
2093
+
}
2094
+
2095
+
static int srpt_compl_thread(void *arg)
2096
+
{
2097
+
struct srpt_rdma_ch *ch;
2098
+
2099
+
/* Hibernation / freezing of the SRPT kernel thread is not supported. */
2100
+
current->flags |= PF_NOFREEZE;
2101
+
2102
+
ch = arg;
2103
+
BUG_ON(!ch);
2104
+
printk(KERN_INFO "Session %s: kernel thread %s (PID %d) started\n",
2105
+
ch->sess_name, ch->thread->comm, current->pid);
2106
+
while (!kthread_should_stop()) {
2107
+
wait_event_interruptible(ch->wait_queue,
2108
+
(srpt_process_completion(ch->cq, ch),
2109
+
kthread_should_stop()));
2110
+
}
2111
+
printk(KERN_INFO "Session %s: kernel thread %s (PID %d) stopped\n",
2112
+
ch->sess_name, ch->thread->comm, current->pid);
2113
+
return 0;
2114
+
}
2115
+
2116
+
/**
2117
+
* srpt_create_ch_ib() - Create receive and send completion queues.
2118
+
*/
2119
+
static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
2120
+
{
2121
+
struct ib_qp_init_attr *qp_init;
2122
+
struct srpt_port *sport = ch->sport;
2123
+
struct srpt_device *sdev = sport->sdev;
2124
+
u32 srp_sq_size = sport->port_attrib.srp_sq_size;
2125
+
int ret;
2126
+
2127
+
WARN_ON(ch->rq_size < 1);
2128
+
2129
+
ret = -ENOMEM;
2130
+
qp_init = kzalloc(sizeof *qp_init, GFP_KERNEL);
2131
+
if (!qp_init)
2132
+
goto out;
2133
+
2134
+
ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch,
2135
+
ch->rq_size + srp_sq_size, 0);
2136
+
if (IS_ERR(ch->cq)) {
2137
+
ret = PTR_ERR(ch->cq);
2138
+
printk(KERN_ERR "failed to create CQ cqe= %d ret= %d\n",
2139
+
ch->rq_size + srp_sq_size, ret);
2140
+
goto out;
2141
+
}
2142
+
2143
+
qp_init->qp_context = (void *)ch;
2144
+
qp_init->event_handler
2145
+
= (void(*)(struct ib_event *, void*))srpt_qp_event;
2146
+
qp_init->send_cq = ch->cq;
2147
+
qp_init->recv_cq = ch->cq;
2148
+
qp_init->srq = sdev->srq;
2149
+
qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
2150
+
qp_init->qp_type = IB_QPT_RC;
2151
+
qp_init->cap.max_send_wr = srp_sq_size;
2152
+
qp_init->cap.max_send_sge = SRPT_DEF_SG_PER_WQE;
2153
+
2154
+
ch->qp = ib_create_qp(sdev->pd, qp_init);
2155
+
if (IS_ERR(ch->qp)) {
2156
+
ret = PTR_ERR(ch->qp);
2157
+
printk(KERN_ERR "failed to create_qp ret= %d\n", ret);
2158
+
goto err_destroy_cq;
2159
+
}
2160
+
2161
+
atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
2162
+
2163
+
pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
2164
+
__func__, ch->cq->cqe, qp_init->cap.max_send_sge,
2165
+
qp_init->cap.max_send_wr, ch->cm_id);
2166
+
2167
+
ret = srpt_init_ch_qp(ch, ch->qp);
2168
+
if (ret)
2169
+
goto err_destroy_qp;
2170
+
2171
+
init_waitqueue_head(&ch->wait_queue);
2172
+
2173
+
pr_debug("creating thread for session %s\n", ch->sess_name);
2174
+
2175
+
ch->thread = kthread_run(srpt_compl_thread, ch, "ib_srpt_compl");
2176
+
if (IS_ERR(ch->thread)) {
2177
+
printk(KERN_ERR "failed to create kernel thread %ld\n",
2178
+
PTR_ERR(ch->thread));
2179
+
ch->thread = NULL;
2180
+
goto err_destroy_qp;
2181
+
}
2182
+
2183
+
out:
2184
+
kfree(qp_init);
2185
+
return ret;
2186
+
2187
+
err_destroy_qp:
2188
+
ib_destroy_qp(ch->qp);
2189
+
err_destroy_cq:
2190
+
ib_destroy_cq(ch->cq);
2191
+
goto out;
2192
+
}
2193
+
2194
+
static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
2195
+
{
2196
+
if (ch->thread)
2197
+
kthread_stop(ch->thread);
2198
+
2199
+
ib_destroy_qp(ch->qp);
2200
+
ib_destroy_cq(ch->cq);
2201
+
}
2202
+
2203
+
/**
2204
+
* __srpt_close_ch() - Close an RDMA channel by setting the QP error state.
2205
+
*
2206
+
* Reset the QP and make sure all resources associated with the channel will
2207
+
* be deallocated at an appropriate time.
2208
+
*
2209
+
* Note: The caller must hold ch->sport->sdev->spinlock.
2210
+
*/
2211
+
static void __srpt_close_ch(struct srpt_rdma_ch *ch)
2212
+
{
2213
+
struct srpt_device *sdev;
2214
+
enum rdma_ch_state prev_state;
2215
+
unsigned long flags;
2216
+
2217
+
sdev = ch->sport->sdev;
2218
+
2219
+
spin_lock_irqsave(&ch->spinlock, flags);
2220
+
prev_state = ch->state;
2221
+
switch (prev_state) {
2222
+
case CH_CONNECTING:
2223
+
case CH_LIVE:
2224
+
ch->state = CH_DISCONNECTING;
2225
+
break;
2226
+
default:
2227
+
break;
2228
+
}
2229
+
spin_unlock_irqrestore(&ch->spinlock, flags);
2230
+
2231
+
switch (prev_state) {
2232
+
case CH_CONNECTING:
2233
+
ib_send_cm_rej(ch->cm_id, IB_CM_REJ_NO_RESOURCES, NULL, 0,
2234
+
NULL, 0);
2235
+
/* fall through */
2236
+
case CH_LIVE:
2237
+
if (ib_send_cm_dreq(ch->cm_id, NULL, 0) < 0)
2238
+
printk(KERN_ERR "sending CM DREQ failed.\n");
2239
+
break;
2240
+
case CH_DISCONNECTING:
2241
+
break;
2242
+
case CH_DRAINING:
2243
+
case CH_RELEASING:
2244
+
break;
2245
+
}
2246
+
}
2247
+
2248
+
/**
2249
+
* srpt_close_ch() - Close an RDMA channel.
2250
+
*/
2251
+
static void srpt_close_ch(struct srpt_rdma_ch *ch)
2252
+
{
2253
+
struct srpt_device *sdev;
2254
+
2255
+
sdev = ch->sport->sdev;
2256
+
spin_lock_irq(&sdev->spinlock);
2257
+
__srpt_close_ch(ch);
2258
+
spin_unlock_irq(&sdev->spinlock);
2259
+
}
2260
+
2261
+
/**
2262
+
* srpt_drain_channel() - Drain a channel by resetting the IB queue pair.
2263
+
* @cm_id: Pointer to the CM ID of the channel to be drained.
2264
+
*
2265
+
* Note: Must be called from inside srpt_cm_handler to avoid a race between
2266
+
* accessing sdev->spinlock and the call to kfree(sdev) in srpt_remove_one()
2267
+
* (the caller of srpt_cm_handler holds the cm_id spinlock; srpt_remove_one()
2268
+
* waits until all target sessions for the associated IB device have been
2269
+
* unregistered and target session registration involves a call to
2270
+
* ib_destroy_cm_id(), which locks the cm_id spinlock and hence waits until
2271
+
* this function has finished).
2272
+
*/
2273
+
static void srpt_drain_channel(struct ib_cm_id *cm_id)
2274
+
{
2275
+
struct srpt_device *sdev;
2276
+
struct srpt_rdma_ch *ch;
2277
+
int ret;
2278
+
bool do_reset = false;
2279
+
2280
+
WARN_ON_ONCE(irqs_disabled());
2281
+
2282
+
sdev = cm_id->context;
2283
+
BUG_ON(!sdev);
2284
+
spin_lock_irq(&sdev->spinlock);
2285
+
list_for_each_entry(ch, &sdev->rch_list, list) {
2286
+
if (ch->cm_id == cm_id) {
2287
+
do_reset = srpt_test_and_set_ch_state(ch,
2288
+
CH_CONNECTING, CH_DRAINING) ||
2289
+
srpt_test_and_set_ch_state(ch,
2290
+
CH_LIVE, CH_DRAINING) ||
2291
+
srpt_test_and_set_ch_state(ch,
2292
+
CH_DISCONNECTING, CH_DRAINING);
2293
+
break;
2294
+
}
2295
+
}
2296
+
spin_unlock_irq(&sdev->spinlock);
2297
+
2298
+
if (do_reset) {
2299
+
ret = srpt_ch_qp_err(ch);
2300
+
if (ret < 0)
2301
+
printk(KERN_ERR "Setting queue pair in error state"
2302
+
" failed: %d\n", ret);
2303
+
}
2304
+
}
2305
+
2306
+
/**
2307
+
* srpt_find_channel() - Look up an RDMA channel.
2308
+
* @cm_id: Pointer to the CM ID of the channel to be looked up.
2309
+
*
2310
+
* Return NULL if no matching RDMA channel has been found.
2311
+
*/
2312
+
static struct srpt_rdma_ch *srpt_find_channel(struct srpt_device *sdev,
2313
+
struct ib_cm_id *cm_id)
2314
+
{
2315
+
struct srpt_rdma_ch *ch;
2316
+
bool found;
2317
+
2318
+
WARN_ON_ONCE(irqs_disabled());
2319
+
BUG_ON(!sdev);
2320
+
2321
+
found = false;
2322
+
spin_lock_irq(&sdev->spinlock);
2323
+
list_for_each_entry(ch, &sdev->rch_list, list) {
2324
+
if (ch->cm_id == cm_id) {
2325
+
found = true;
2326
+
break;
2327
+
}
2328
+
}
2329
+
spin_unlock_irq(&sdev->spinlock);
2330
+
2331
+
return found ? ch : NULL;
2332
+
}
2333
+
2334
+
/**
2335
+
* srpt_release_channel() - Release channel resources.
2336
+
*
2337
+
* Schedules the actual release because:
2338
+
* - Calling the ib_destroy_cm_id() call from inside an IB CM callback would
2339
+
* trigger a deadlock.
2340
+
* - It is not safe to call TCM transport_* functions from interrupt context.
2341
+
*/
2342
+
static void srpt_release_channel(struct srpt_rdma_ch *ch)
2343
+
{
2344
+
schedule_work(&ch->release_work);
2345
+
}
2346
+
2347
+
static void srpt_release_channel_work(struct work_struct *w)
2348
+
{
2349
+
struct srpt_rdma_ch *ch;
2350
+
struct srpt_device *sdev;
2351
+
2352
+
ch = container_of(w, struct srpt_rdma_ch, release_work);
2353
+
pr_debug("ch = %p; ch->sess = %p; release_done = %p\n", ch, ch->sess,
2354
+
ch->release_done);
2355
+
2356
+
sdev = ch->sport->sdev;
2357
+
BUG_ON(!sdev);
2358
+
2359
+
transport_deregister_session_configfs(ch->sess);
2360
+
transport_deregister_session(ch->sess);
2361
+
ch->sess = NULL;
2362
+
2363
+
srpt_destroy_ch_ib(ch);
2364
+
2365
+
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2366
+
ch->sport->sdev, ch->rq_size,
2367
+
ch->rsp_size, DMA_TO_DEVICE);
2368
+
2369
+
spin_lock_irq(&sdev->spinlock);
2370
+
list_del(&ch->list);
2371
+
spin_unlock_irq(&sdev->spinlock);
2372
+
2373
+
ib_destroy_cm_id(ch->cm_id);
2374
+
2375
+
if (ch->release_done)
2376
+
complete(ch->release_done);
2377
+
2378
+
wake_up(&sdev->ch_releaseQ);
2379
+
2380
+
kfree(ch);
2381
+
}
2382
+
2383
+
static struct srpt_node_acl *__srpt_lookup_acl(struct srpt_port *sport,
2384
+
u8 i_port_id[16])
2385
+
{
2386
+
struct srpt_node_acl *nacl;
2387
+
2388
+
list_for_each_entry(nacl, &sport->port_acl_list, list)
2389
+
if (memcmp(nacl->i_port_id, i_port_id,
2390
+
sizeof(nacl->i_port_id)) == 0)
2391
+
return nacl;
2392
+
2393
+
return NULL;
2394
+
}
2395
+
2396
+
static struct srpt_node_acl *srpt_lookup_acl(struct srpt_port *sport,
2397
+
u8 i_port_id[16])
2398
+
{
2399
+
struct srpt_node_acl *nacl;
2400
+
2401
+
spin_lock_irq(&sport->port_acl_lock);
2402
+
nacl = __srpt_lookup_acl(sport, i_port_id);
2403
+
spin_unlock_irq(&sport->port_acl_lock);
2404
+
2405
+
return nacl;
2406
+
}
2407
+
2408
+
/**
2409
+
* srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
2410
+
*
2411
+
* Ownership of the cm_id is transferred to the target session if this
2412
+
* functions returns zero. Otherwise the caller remains the owner of cm_id.
2413
+
*/
2414
+
static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
2415
+
struct ib_cm_req_event_param *param,
2416
+
void *private_data)
2417
+
{
2418
+
struct srpt_device *sdev = cm_id->context;
2419
+
struct srpt_port *sport = &sdev->port[param->port - 1];
2420
+
struct srp_login_req *req;
2421
+
struct srp_login_rsp *rsp;
2422
+
struct srp_login_rej *rej;
2423
+
struct ib_cm_rep_param *rep_param;
2424
+
struct srpt_rdma_ch *ch, *tmp_ch;
2425
+
struct srpt_node_acl *nacl;
2426
+
u32 it_iu_len;
2427
+
int i;
2428
+
int ret = 0;
2429
+
2430
+
WARN_ON_ONCE(irqs_disabled());
2431
+
2432
+
if (WARN_ON(!sdev || !private_data))
2433
+
return -EINVAL;
2434
+
2435
+
req = (struct srp_login_req *)private_data;
2436
+
2437
+
it_iu_len = be32_to_cpu(req->req_it_iu_len);
2438
+
2439
+
printk(KERN_INFO "Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx,"
2440
+
" t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d"
2441
+
" (guid=0x%llx:0x%llx)\n",
2442
+
be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]),
2443
+
be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]),
2444
+
be64_to_cpu(*(__be64 *)&req->target_port_id[0]),
2445
+
be64_to_cpu(*(__be64 *)&req->target_port_id[8]),
2446
+
it_iu_len,
2447
+
param->port,
2448
+
be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]),
2449
+
be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8]));
2450
+
2451
+
rsp = kzalloc(sizeof *rsp, GFP_KERNEL);
2452
+
rej = kzalloc(sizeof *rej, GFP_KERNEL);
2453
+
rep_param = kzalloc(sizeof *rep_param, GFP_KERNEL);
2454
+
2455
+
if (!rsp || !rej || !rep_param) {
2456
+
ret = -ENOMEM;
2457
+
goto out;
2458
+
}
2459
+
2460
+
if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
2461
+
rej->reason = __constant_cpu_to_be32(
2462
+
SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
2463
+
ret = -EINVAL;
2464
+
printk(KERN_ERR "rejected SRP_LOGIN_REQ because its"
2465
+
" length (%d bytes) is out of range (%d .. %d)\n",
2466
+
it_iu_len, 64, srp_max_req_size);
2467
+
goto reject;
2468
+
}
2469
+
2470
+
if (!sport->enabled) {
2471
+
rej->reason = __constant_cpu_to_be32(
2472
+
SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2473
+
ret = -EINVAL;
2474
+
printk(KERN_ERR "rejected SRP_LOGIN_REQ because the target port"
2475
+
" has not yet been enabled\n");
2476
+
goto reject;
2477
+
}
2478
+
2479
+
if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
2480
+
rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
2481
+
2482
+
spin_lock_irq(&sdev->spinlock);
2483
+
2484
+
list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) {
2485
+
if (!memcmp(ch->i_port_id, req->initiator_port_id, 16)
2486
+
&& !memcmp(ch->t_port_id, req->target_port_id, 16)
2487
+
&& param->port == ch->sport->port
2488
+
&& param->listen_id == ch->sport->sdev->cm_id
2489
+
&& ch->cm_id) {
2490
+
enum rdma_ch_state ch_state;
2491
+
2492
+
ch_state = srpt_get_ch_state(ch);
2493
+
if (ch_state != CH_CONNECTING
2494
+
&& ch_state != CH_LIVE)
2495
+
continue;
2496
+
2497
+
/* found an existing channel */
2498
+
pr_debug("Found existing channel %s"
2499
+
" cm_id= %p state= %d\n",
2500
+
ch->sess_name, ch->cm_id, ch_state);
2501
+
2502
+
__srpt_close_ch(ch);
2503
+
2504
+
rsp->rsp_flags =
2505
+
SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
2506
+
}
2507
+
}
2508
+
2509
+
spin_unlock_irq(&sdev->spinlock);
2510
+
2511
+
} else
2512
+
rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
2513
+
2514
+
if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
2515
+
|| *(__be64 *)(req->target_port_id + 8) !=
2516
+
cpu_to_be64(srpt_service_guid)) {
2517
+
rej->reason = __constant_cpu_to_be32(
2518
+
SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
2519
+
ret = -ENOMEM;
2520
+
printk(KERN_ERR "rejected SRP_LOGIN_REQ because it"
2521
+
" has an invalid target port identifier.\n");
2522
+
goto reject;
2523
+
}
2524
+
2525
+
ch = kzalloc(sizeof *ch, GFP_KERNEL);
2526
+
if (!ch) {
2527
+
rej->reason = __constant_cpu_to_be32(
2528
+
SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2529
+
printk(KERN_ERR "rejected SRP_LOGIN_REQ because no memory.\n");
2530
+
ret = -ENOMEM;
2531
+
goto reject;
2532
+
}
2533
+
2534
+
INIT_WORK(&ch->release_work, srpt_release_channel_work);
2535
+
memcpy(ch->i_port_id, req->initiator_port_id, 16);
2536
+
memcpy(ch->t_port_id, req->target_port_id, 16);
2537
+
ch->sport = &sdev->port[param->port - 1];
2538
+
ch->cm_id = cm_id;
2539
+
/*
2540
+
* Avoid QUEUE_FULL conditions by limiting the number of buffers used
2541
+
* for the SRP protocol to the command queue size.
2542
+
*/
2543
+
ch->rq_size = SRPT_RQ_SIZE;
2544
+
spin_lock_init(&ch->spinlock);
2545
+
ch->state = CH_CONNECTING;
2546
+
INIT_LIST_HEAD(&ch->cmd_wait_list);
2547
+
ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
2548
+
2549
+
ch->ioctx_ring = (struct srpt_send_ioctx **)
2550
+
srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2551
+
sizeof(*ch->ioctx_ring[0]),
2552
+
ch->rsp_size, DMA_TO_DEVICE);
2553
+
if (!ch->ioctx_ring)
2554
+
goto free_ch;
2555
+
2556
+
INIT_LIST_HEAD(&ch->free_list);
2557
+
for (i = 0; i < ch->rq_size; i++) {
2558
+
ch->ioctx_ring[i]->ch = ch;
2559
+
list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
2560
+
}
2561
+
2562
+
ret = srpt_create_ch_ib(ch);
2563
+
if (ret) {
2564
+
rej->reason = __constant_cpu_to_be32(
2565
+
SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2566
+
printk(KERN_ERR "rejected SRP_LOGIN_REQ because creating"
2567
+
" a new RDMA channel failed.\n");
2568
+
goto free_ring;
2569
+
}
2570
+
2571
+
ret = srpt_ch_qp_rtr(ch, ch->qp);
2572
+
if (ret) {
2573
+
rej->reason = __constant_cpu_to_be32(
2574
+
SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2575
+
printk(KERN_ERR "rejected SRP_LOGIN_REQ because enabling"
2576
+
" RTR failed (error code = %d)\n", ret);
2577
+
goto destroy_ib;
2578
+
}
2579
+
/*
2580
+
* Use the initator port identifier as the session name.
2581
+
*/
2582
+
snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx",
2583
+
be64_to_cpu(*(__be64 *)ch->i_port_id),
2584
+
be64_to_cpu(*(__be64 *)(ch->i_port_id + 8)));
2585
+
2586
+
pr_debug("registering session %s\n", ch->sess_name);
2587
+
2588
+
nacl = srpt_lookup_acl(sport, ch->i_port_id);
2589
+
if (!nacl) {
2590
+
printk(KERN_INFO "Rejected login because no ACL has been"
2591
+
" configured yet for initiator %s.\n", ch->sess_name);
2592
+
rej->reason = __constant_cpu_to_be32(
2593
+
SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
2594
+
goto destroy_ib;
2595
+
}
2596
+
2597
+
ch->sess = transport_init_session();
2598
+
if (!ch->sess) {
2599
+
rej->reason = __constant_cpu_to_be32(
2600
+
SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2601
+
pr_debug("Failed to create session\n");
2602
+
goto deregister_session;
2603
+
}
2604
+
ch->sess->se_node_acl = &nacl->nacl;
2605
+
transport_register_session(&sport->port_tpg_1, &nacl->nacl, ch->sess, ch);
2606
+
2607
+
pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess,
2608
+
ch->sess_name, ch->cm_id);
2609
+
2610
+
/* create srp_login_response */
2611
+
rsp->opcode = SRP_LOGIN_RSP;
2612
+
rsp->tag = req->tag;
2613
+
rsp->max_it_iu_len = req->req_it_iu_len;
2614
+
rsp->max_ti_iu_len = req->req_it_iu_len;
2615
+
ch->max_ti_iu_len = it_iu_len;
2616
+
rsp->buf_fmt = __constant_cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2617
+
| SRP_BUF_FORMAT_INDIRECT);
2618
+
rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
2619
+
atomic_set(&ch->req_lim, ch->rq_size);
2620
+
atomic_set(&ch->req_lim_delta, 0);
2621
+
2622
+
/* create cm reply */
2623
+
rep_param->qp_num = ch->qp->qp_num;
2624
+
rep_param->private_data = (void *)rsp;
2625
+
rep_param->private_data_len = sizeof *rsp;
2626
+
rep_param->rnr_retry_count = 7;
2627
+
rep_param->flow_control = 1;
2628
+
rep_param->failover_accepted = 0;
2629
+
rep_param->srq = 1;
2630
+
rep_param->responder_resources = 4;
2631
+
rep_param->initiator_depth = 4;
2632
+
2633
+
ret = ib_send_cm_rep(cm_id, rep_param);
2634
+
if (ret) {
2635
+
printk(KERN_ERR "sending SRP_LOGIN_REQ response failed"
2636
+
" (error code = %d)\n", ret);
2637
+
goto release_channel;
2638
+
}
2639
+
2640
+
spin_lock_irq(&sdev->spinlock);
2641
+
list_add_tail(&ch->list, &sdev->rch_list);
2642
+
spin_unlock_irq(&sdev->spinlock);
2643
+
2644
+
goto out;
2645
+
2646
+
release_channel:
2647
+
srpt_set_ch_state(ch, CH_RELEASING);
2648
+
transport_deregister_session_configfs(ch->sess);
2649
+
2650
+
deregister_session:
2651
+
transport_deregister_session(ch->sess);
2652
+
ch->sess = NULL;
2653
+
2654
+
destroy_ib:
2655
+
srpt_destroy_ch_ib(ch);
2656
+
2657
+
free_ring:
2658
+
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2659
+
ch->sport->sdev, ch->rq_size,
2660
+
ch->rsp_size, DMA_TO_DEVICE);
2661
+
free_ch:
2662
+
kfree(ch);
2663
+
2664
+
reject:
2665
+
rej->opcode = SRP_LOGIN_REJ;
2666
+
rej->tag = req->tag;
2667
+
rej->buf_fmt = __constant_cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2668
+
| SRP_BUF_FORMAT_INDIRECT);
2669
+
2670
+
ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
2671
+
(void *)rej, sizeof *rej);
2672
+
2673
+
out:
2674
+
kfree(rep_param);
2675
+
kfree(rsp);
2676
+
kfree(rej);
2677
+
2678
+
return ret;
2679
+
}
2680
+
2681
+
static void srpt_cm_rej_recv(struct ib_cm_id *cm_id)
2682
+
{
2683
+
printk(KERN_INFO "Received IB REJ for cm_id %p.\n", cm_id);
2684
+
srpt_drain_channel(cm_id);
2685
+
}
2686
+
2687
+
/**
2688
+
* srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event.
2689
+
*
2690
+
* An IB_CM_RTU_RECEIVED message indicates that the connection is established
2691
+
* and that the recipient may begin transmitting (RTU = ready to use).
2692
+
*/
2693
+
static void srpt_cm_rtu_recv(struct ib_cm_id *cm_id)
2694
+
{
2695
+
struct srpt_rdma_ch *ch;
2696
+
int ret;
2697
+
2698
+
ch = srpt_find_channel(cm_id->context, cm_id);
2699
+
BUG_ON(!ch);
2700
+
2701
+
if (srpt_test_and_set_ch_state(ch, CH_CONNECTING, CH_LIVE)) {
2702
+
struct srpt_recv_ioctx *ioctx, *ioctx_tmp;
2703
+
2704
+
ret = srpt_ch_qp_rts(ch, ch->qp);
2705
+
2706
+
list_for_each_entry_safe(ioctx, ioctx_tmp, &ch->cmd_wait_list,
2707
+
wait_list) {
2708
+
list_del(&ioctx->wait_list);
2709
+
srpt_handle_new_iu(ch, ioctx, NULL);
2710
+
}
2711
+
if (ret)
2712
+
srpt_close_ch(ch);
2713
+
}
2714
+
}
2715
+
2716
+
static void srpt_cm_timewait_exit(struct ib_cm_id *cm_id)
2717
+
{
2718
+
printk(KERN_INFO "Received IB TimeWait exit for cm_id %p.\n", cm_id);
2719
+
srpt_drain_channel(cm_id);
2720
+
}
2721
+
2722
+
static void srpt_cm_rep_error(struct ib_cm_id *cm_id)
2723
+
{
2724
+
printk(KERN_INFO "Received IB REP error for cm_id %p.\n", cm_id);
2725
+
srpt_drain_channel(cm_id);
2726
+
}
2727
+
2728
+
/**
2729
+
* srpt_cm_dreq_recv() - Process reception of a DREQ message.
2730
+
*/
2731
+
static void srpt_cm_dreq_recv(struct ib_cm_id *cm_id)
2732
+
{
2733
+
struct srpt_rdma_ch *ch;
2734
+
unsigned long flags;
2735
+
bool send_drep = false;
2736
+
2737
+
ch = srpt_find_channel(cm_id->context, cm_id);
2738
+
BUG_ON(!ch);
2739
+
2740
+
pr_debug("cm_id= %p ch->state= %d\n", cm_id, srpt_get_ch_state(ch));
2741
+
2742
+
spin_lock_irqsave(&ch->spinlock, flags);
2743
+
switch (ch->state) {
2744
+
case CH_CONNECTING:
2745
+
case CH_LIVE:
2746
+
send_drep = true;
2747
+
ch->state = CH_DISCONNECTING;
2748
+
break;
2749
+
case CH_DISCONNECTING:
2750
+
case CH_DRAINING:
2751
+
case CH_RELEASING:
2752
+
WARN(true, "unexpected channel state %d\n", ch->state);
2753
+
break;
2754
+
}
2755
+
spin_unlock_irqrestore(&ch->spinlock, flags);
2756
+
2757
+
if (send_drep) {
2758
+
if (ib_send_cm_drep(ch->cm_id, NULL, 0) < 0)
2759
+
printk(KERN_ERR "Sending IB DREP failed.\n");
2760
+
printk(KERN_INFO "Received DREQ and sent DREP for session %s.\n",
2761
+
ch->sess_name);
2762
+
}
2763
+
}
2764
+
2765
+
/**
2766
+
* srpt_cm_drep_recv() - Process reception of a DREP message.
2767
+
*/
2768
+
static void srpt_cm_drep_recv(struct ib_cm_id *cm_id)
2769
+
{
2770
+
printk(KERN_INFO "Received InfiniBand DREP message for cm_id %p.\n",
2771
+
cm_id);
2772
+
srpt_drain_channel(cm_id);
2773
+
}
2774
+
2775
+
/**
2776
+
* srpt_cm_handler() - IB connection manager callback function.
2777
+
*
2778
+
* A non-zero return value will cause the caller destroy the CM ID.
2779
+
*
2780
+
* Note: srpt_cm_handler() must only return a non-zero value when transferring
2781
+
* ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2782
+
* a non-zero value in any other case will trigger a race with the
2783
+
* ib_destroy_cm_id() call in srpt_release_channel().
2784
+
*/
2785
+
static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2786
+
{
2787
+
int ret;
2788
+
2789
+
ret = 0;
2790
+
switch (event->event) {
2791
+
case IB_CM_REQ_RECEIVED:
2792
+
ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd,
2793
+
event->private_data);
2794
+
break;
2795
+
case IB_CM_REJ_RECEIVED:
2796
+
srpt_cm_rej_recv(cm_id);
2797
+
break;
2798
+
case IB_CM_RTU_RECEIVED:
2799
+
case IB_CM_USER_ESTABLISHED:
2800
+
srpt_cm_rtu_recv(cm_id);
2801
+
break;
2802
+
case IB_CM_DREQ_RECEIVED:
2803
+
srpt_cm_dreq_recv(cm_id);
2804
+
break;
2805
+
case IB_CM_DREP_RECEIVED:
2806
+
srpt_cm_drep_recv(cm_id);
2807
+
break;
2808
+
case IB_CM_TIMEWAIT_EXIT:
2809
+
srpt_cm_timewait_exit(cm_id);
2810
+
break;
2811
+
case IB_CM_REP_ERROR:
2812
+
srpt_cm_rep_error(cm_id);
2813
+
break;
2814
+
case IB_CM_DREQ_ERROR:
2815
+
printk(KERN_INFO "Received IB DREQ ERROR event.\n");
2816
+
break;
2817
+
case IB_CM_MRA_RECEIVED:
2818
+
printk(KERN_INFO "Received IB MRA event\n");
2819
+
break;
2820
+
default:
2821
+
printk(KERN_ERR "received unrecognized IB CM event %d\n",
2822
+
event->event);
2823
+
break;
2824
+
}
2825
+
2826
+
return ret;
2827
+
}
2828
+
2829
+
/**
2830
+
* srpt_perform_rdmas() - Perform IB RDMA.
2831
+
*
2832
+
* Returns zero upon success or a negative number upon failure.
2833
+
*/
2834
+
static int srpt_perform_rdmas(struct srpt_rdma_ch *ch,
2835
+
struct srpt_send_ioctx *ioctx)
2836
+
{
2837
+
struct ib_send_wr wr;
2838
+
struct ib_send_wr *bad_wr;
2839
+
struct rdma_iu *riu;
2840
+
int i;
2841
+
int ret;
2842
+
int sq_wr_avail;
2843
+
enum dma_data_direction dir;
2844
+
const int n_rdma = ioctx->n_rdma;
2845
+
2846
+
dir = ioctx->cmd.data_direction;
2847
+
if (dir == DMA_TO_DEVICE) {
2848
+
/* write */
2849
+
ret = -ENOMEM;
2850
+
sq_wr_avail = atomic_sub_return(n_rdma, &ch->sq_wr_avail);
2851
+
if (sq_wr_avail < 0) {
2852
+
printk(KERN_WARNING "IB send queue full (needed %d)\n",
2853
+
n_rdma);
2854
+
goto out;
2855
+
}
2856
+
}
2857
+
2858
+
ioctx->rdma_aborted = false;
2859
+
ret = 0;
2860
+
riu = ioctx->rdma_ius;
2861
+
memset(&wr, 0, sizeof wr);
2862
+
2863
+
for (i = 0; i < n_rdma; ++i, ++riu) {
2864
+
if (dir == DMA_FROM_DEVICE) {
2865
+
wr.opcode = IB_WR_RDMA_WRITE;
2866
+
wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
2867
+
SRPT_RDMA_WRITE_LAST :
2868
+
SRPT_RDMA_MID,
2869
+
ioctx->ioctx.index);
2870
+
} else {
2871
+
wr.opcode = IB_WR_RDMA_READ;
2872
+
wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
2873
+
SRPT_RDMA_READ_LAST :
2874
+
SRPT_RDMA_MID,
2875
+
ioctx->ioctx.index);
2876
+
}
2877
+
wr.next = NULL;
2878
+
wr.wr.rdma.remote_addr = riu->raddr;
2879
+
wr.wr.rdma.rkey = riu->rkey;
2880
+
wr.num_sge = riu->sge_cnt;
2881
+
wr.sg_list = riu->sge;
2882
+
2883
+
/* only get completion event for the last rdma write */
2884
+
if (i == (n_rdma - 1) && dir == DMA_TO_DEVICE)
2885
+
wr.send_flags = IB_SEND_SIGNALED;
2886
+
2887
+
ret = ib_post_send(ch->qp, &wr, &bad_wr);
2888
+
if (ret)
2889
+
break;
2890
+
}
2891
+
2892
+
if (ret)
2893
+
printk(KERN_ERR "%s[%d]: ib_post_send() returned %d for %d/%d",
2894
+
__func__, __LINE__, ret, i, n_rdma);
2895
+
if (ret && i > 0) {
2896
+
wr.num_sge = 0;
2897
+
wr.wr_id = encode_wr_id(SRPT_RDMA_ABORT, ioctx->ioctx.index);
2898
+
wr.send_flags = IB_SEND_SIGNALED;
2899
+
while (ch->state == CH_LIVE &&
2900
+
ib_post_send(ch->qp, &wr, &bad_wr) != 0) {
2901
+
printk(KERN_INFO "Trying to abort failed RDMA transfer [%d]",
2902
+
ioctx->ioctx.index);
2903
+
msleep(1000);
2904
+
}
2905
+
while (ch->state != CH_RELEASING && !ioctx->rdma_aborted) {
2906
+
printk(KERN_INFO "Waiting until RDMA abort finished [%d]",
2907
+
ioctx->ioctx.index);
2908
+
msleep(1000);
2909
+
}
2910
+
}
2911
+
out:
2912
+
if (unlikely(dir == DMA_TO_DEVICE && ret < 0))
2913
+
atomic_add(n_rdma, &ch->sq_wr_avail);
2914
+
return ret;
2915
+
}
2916
+
2917
+
/**
2918
+
* srpt_xfer_data() - Start data transfer from initiator to target.
2919
+
*/
2920
+
static int srpt_xfer_data(struct srpt_rdma_ch *ch,
2921
+
struct srpt_send_ioctx *ioctx)
2922
+
{
2923
+
int ret;
2924
+
2925
+
ret = srpt_map_sg_to_ib_sge(ch, ioctx);
2926
+
if (ret) {
2927
+
printk(KERN_ERR "%s[%d] ret=%d\n", __func__, __LINE__, ret);
2928
+
goto out;
2929
+
}
2930
+
2931
+
ret = srpt_perform_rdmas(ch, ioctx);
2932
+
if (ret) {
2933
+
if (ret == -EAGAIN || ret == -ENOMEM)
2934
+
printk(KERN_INFO "%s[%d] queue full -- ret=%d\n",
2935
+
__func__, __LINE__, ret);
2936
+
else
2937
+
printk(KERN_ERR "%s[%d] fatal error -- ret=%d\n",
2938
+
__func__, __LINE__, ret);
2939
+
goto out_unmap;
2940
+
}
2941
+
2942
+
out:
2943
+
return ret;
2944
+
out_unmap:
2945
+
srpt_unmap_sg_to_ib_sge(ch, ioctx);
2946
+
goto out;
2947
+
}
2948
+
2949
+
static int srpt_write_pending_status(struct se_cmd *se_cmd)
2950
+
{
2951
+
struct srpt_send_ioctx *ioctx;
2952
+
2953
+
ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2954
+
return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA;
2955
+
}
2956
+
2957
+
/*
2958
+
* srpt_write_pending() - Start data transfer from initiator to target (write).
2959
+
*/
2960
+
static int srpt_write_pending(struct se_cmd *se_cmd)
2961
+
{
2962
+
struct srpt_rdma_ch *ch;
2963
+
struct srpt_send_ioctx *ioctx;
2964
+
enum srpt_command_state new_state;
2965
+
enum rdma_ch_state ch_state;
2966
+
int ret;
2967
+
2968
+
ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2969
+
2970
+
new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
2971
+
WARN_ON(new_state == SRPT_STATE_DONE);
2972
+
2973
+
ch = ioctx->ch;
2974
+
BUG_ON(!ch);
2975
+
2976
+
ch_state = srpt_get_ch_state(ch);
2977
+
switch (ch_state) {
2978
+
case CH_CONNECTING:
2979
+
WARN(true, "unexpected channel state %d\n", ch_state);
2980
+
ret = -EINVAL;
2981
+
goto out;
2982
+
case CH_LIVE:
2983
+
break;
2984
+
case CH_DISCONNECTING:
2985
+
case CH_DRAINING:
2986
+
case CH_RELEASING:
2987
+
pr_debug("cmd with tag %lld: channel disconnecting\n",
2988
+
ioctx->tag);
2989
+
srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN);
2990
+
ret = -EINVAL;
2991
+
goto out;
2992
+
}
2993
+
ret = srpt_xfer_data(ch, ioctx);
2994
+
2995
+
out:
2996
+
return ret;
2997
+
}
2998
+
2999
+
static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
3000
+
{
3001
+
switch (tcm_mgmt_status) {
3002
+
case TMR_FUNCTION_COMPLETE:
3003
+
return SRP_TSK_MGMT_SUCCESS;
3004
+
case TMR_FUNCTION_REJECTED:
3005
+
return SRP_TSK_MGMT_FUNC_NOT_SUPP;
3006
+
}
3007
+
return SRP_TSK_MGMT_FAILED;
3008
+
}
3009
+
3010
+
/**
3011
+
* srpt_queue_response() - Transmits the response to a SCSI command.
3012
+
*
3013
+
* Callback function called by the TCM core. Must not block since it can be
3014
+
* invoked on the context of the IB completion handler.
3015
+
*/
3016
+
static int srpt_queue_response(struct se_cmd *cmd)
3017
+
{
3018
+
struct srpt_rdma_ch *ch;
3019
+
struct srpt_send_ioctx *ioctx;
3020
+
enum srpt_command_state state;
3021
+
unsigned long flags;
3022
+
int ret;
3023
+
enum dma_data_direction dir;
3024
+
int resp_len;
3025
+
u8 srp_tm_status;
3026
+
3027
+
ret = 0;
3028
+
3029
+
ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
3030
+
ch = ioctx->ch;
3031
+
BUG_ON(!ch);
3032
+
3033
+
spin_lock_irqsave(&ioctx->spinlock, flags);
3034
+
state = ioctx->state;
3035
+
switch (state) {
3036
+
case SRPT_STATE_NEW:
3037
+
case SRPT_STATE_DATA_IN:
3038
+
ioctx->state = SRPT_STATE_CMD_RSP_SENT;
3039
+
break;
3040
+
case SRPT_STATE_MGMT:
3041
+
ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
3042
+
break;
3043
+
default:
3044
+
WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
3045
+
ch, ioctx->ioctx.index, ioctx->state);
3046
+
break;
3047
+
}
3048
+
spin_unlock_irqrestore(&ioctx->spinlock, flags);
3049
+
3050
+
if (unlikely(transport_check_aborted_status(&ioctx->cmd, false)
3051
+
|| WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) {
3052
+
atomic_inc(&ch->req_lim_delta);
3053
+
srpt_abort_cmd(ioctx);
3054
+
goto out;
3055
+
}
3056
+
3057
+
dir = ioctx->cmd.data_direction;
3058
+
3059
+
/* For read commands, transfer the data to the initiator. */
3060
+
if (dir == DMA_FROM_DEVICE && ioctx->cmd.data_length &&
3061
+
!ioctx->queue_status_only) {
3062
+
ret = srpt_xfer_data(ch, ioctx);
3063
+
if (ret) {
3064
+
printk(KERN_ERR "xfer_data failed for tag %llu\n",
3065
+
ioctx->tag);
3066
+
goto out;
3067
+
}
3068
+
}
3069
+
3070
+
if (state != SRPT_STATE_MGMT)
3071
+
resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->tag,
3072
+
cmd->scsi_status);
3073
+
else {
3074
+
srp_tm_status
3075
+
= tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
3076
+
resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
3077
+
ioctx->tag);
3078
+
}
3079
+
ret = srpt_post_send(ch, ioctx, resp_len);
3080
+
if (ret) {
3081
+
printk(KERN_ERR "sending cmd response failed for tag %llu\n",
3082
+
ioctx->tag);
3083
+
srpt_unmap_sg_to_ib_sge(ch, ioctx);
3084
+
srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
3085
+
kref_put(&ioctx->kref, srpt_put_send_ioctx_kref);
3086
+
}
3087
+
3088
+
out:
3089
+
return ret;
3090
+
}
3091
+
3092
+
static int srpt_queue_status(struct se_cmd *cmd)
3093
+
{
3094
+
struct srpt_send_ioctx *ioctx;
3095
+
3096
+
ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
3097
+
BUG_ON(ioctx->sense_data != cmd->sense_buffer);
3098
+
if (cmd->se_cmd_flags &
3099
+
(SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
3100
+
WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
3101
+
ioctx->queue_status_only = true;
3102
+
return srpt_queue_response(cmd);
3103
+
}
3104
+
3105
+
static void srpt_refresh_port_work(struct work_struct *work)
3106
+
{
3107
+
struct srpt_port *sport = container_of(work, struct srpt_port, work);
3108
+
3109
+
srpt_refresh_port(sport);
3110
+
}
3111
+
3112
+
static int srpt_ch_list_empty(struct srpt_device *sdev)
3113
+
{
3114
+
int res;
3115
+
3116
+
spin_lock_irq(&sdev->spinlock);
3117
+
res = list_empty(&sdev->rch_list);
3118
+
spin_unlock_irq(&sdev->spinlock);
3119
+
3120
+
return res;
3121
+
}
3122
+
3123
+
/**
3124
+
* srpt_release_sdev() - Free the channel resources associated with a target.
3125
+
*/
3126
+
static int srpt_release_sdev(struct srpt_device *sdev)
3127
+
{
3128
+
struct srpt_rdma_ch *ch, *tmp_ch;
3129
+
int res;
3130
+
3131
+
WARN_ON_ONCE(irqs_disabled());
3132
+
3133
+
BUG_ON(!sdev);
3134
+
3135
+
spin_lock_irq(&sdev->spinlock);
3136
+
list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list)
3137
+
__srpt_close_ch(ch);
3138
+
spin_unlock_irq(&sdev->spinlock);
3139
+
3140
+
res = wait_event_interruptible(sdev->ch_releaseQ,
3141
+
srpt_ch_list_empty(sdev));
3142
+
if (res)
3143
+
printk(KERN_ERR "%s: interrupted.\n", __func__);
3144
+
3145
+
return 0;
3146
+
}
3147
+
3148
+
static struct srpt_port *__srpt_lookup_port(const char *name)
3149
+
{
3150
+
struct ib_device *dev;
3151
+
struct srpt_device *sdev;
3152
+
struct srpt_port *sport;
3153
+
int i;
3154
+
3155
+
list_for_each_entry(sdev, &srpt_dev_list, list) {
3156
+
dev = sdev->device;
3157
+
if (!dev)
3158
+
continue;
3159
+
3160
+
for (i = 0; i < dev->phys_port_cnt; i++) {
3161
+
sport = &sdev->port[i];
3162
+
3163
+
if (!strcmp(sport->port_guid, name))
3164
+
return sport;
3165
+
}
3166
+
}
3167
+
3168
+
return NULL;
3169
+
}
3170
+
3171
+
static struct srpt_port *srpt_lookup_port(const char *name)
3172
+
{
3173
+
struct srpt_port *sport;
3174
+
3175
+
spin_lock(&srpt_dev_lock);
3176
+
sport = __srpt_lookup_port(name);
3177
+
spin_unlock(&srpt_dev_lock);
3178
+
3179
+
return sport;
3180
+
}
3181
+
3182
+
/**
3183
+
* srpt_add_one() - Infiniband device addition callback function.
3184
+
*/
3185
+
static void srpt_add_one(struct ib_device *device)
3186
+
{
3187
+
struct srpt_device *sdev;
3188
+
struct srpt_port *sport;
3189
+
struct ib_srq_init_attr srq_attr;
3190
+
int i;
3191
+
3192
+
pr_debug("device = %p, device->dma_ops = %p\n", device,
3193
+
device->dma_ops);
3194
+
3195
+
sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
3196
+
if (!sdev)
3197
+
goto err;
3198
+
3199
+
sdev->device = device;
3200
+
INIT_LIST_HEAD(&sdev->rch_list);
3201
+
init_waitqueue_head(&sdev->ch_releaseQ);
3202
+
spin_lock_init(&sdev->spinlock);
3203
+
3204
+
if (ib_query_device(device, &sdev->dev_attr))
3205
+
goto free_dev;
3206
+
3207
+
sdev->pd = ib_alloc_pd(device);
3208
+
if (IS_ERR(sdev->pd))
3209
+
goto free_dev;
3210
+
3211
+
sdev->mr = ib_get_dma_mr(sdev->pd, IB_ACCESS_LOCAL_WRITE);
3212
+
if (IS_ERR(sdev->mr))
3213
+
goto err_pd;
3214
+
3215
+
sdev->srq_size = min(srpt_srq_size, sdev->dev_attr.max_srq_wr);
3216
+
3217
+
srq_attr.event_handler = srpt_srq_event;
3218
+
srq_attr.srq_context = (void *)sdev;
3219
+
srq_attr.attr.max_wr = sdev->srq_size;
3220
+
srq_attr.attr.max_sge = 1;
3221
+
srq_attr.attr.srq_limit = 0;
3222
+
3223
+
sdev->srq = ib_create_srq(sdev->pd, &srq_attr);
3224
+
if (IS_ERR(sdev->srq))
3225
+
goto err_mr;
3226
+
3227
+
pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n",
3228
+
__func__, sdev->srq_size, sdev->dev_attr.max_srq_wr,
3229
+
device->name);
3230
+
3231
+
if (!srpt_service_guid)
3232
+
srpt_service_guid = be64_to_cpu(device->node_guid);
3233
+
3234
+
sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
3235
+
if (IS_ERR(sdev->cm_id))
3236
+
goto err_srq;
3237
+
3238
+
/* print out target login information */
3239
+
pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
3240
+
"pkey=ffff,service_id=%016llx\n", srpt_service_guid,
3241
+
srpt_service_guid, srpt_service_guid);
3242
+
3243
+
/*
3244
+
* We do not have a consistent service_id (ie. also id_ext of target_id)
3245
+
* to identify this target. We currently use the guid of the first HCA
3246
+
* in the system as service_id; therefore, the target_id will change
3247
+
* if this HCA is gone bad and replaced by different HCA
3248
+
*/
3249
+
if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0, NULL))
3250
+
goto err_cm;
3251
+
3252
+
INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
3253
+
srpt_event_handler);
3254
+
if (ib_register_event_handler(&sdev->event_handler))
3255
+
goto err_cm;
3256
+
3257
+
sdev->ioctx_ring = (struct srpt_recv_ioctx **)
3258
+
srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
3259
+
sizeof(*sdev->ioctx_ring[0]),
3260
+
srp_max_req_size, DMA_FROM_DEVICE);
3261
+
if (!sdev->ioctx_ring)
3262
+
goto err_event;
3263
+
3264
+
for (i = 0; i < sdev->srq_size; ++i)
3265
+
srpt_post_recv(sdev, sdev->ioctx_ring[i]);
3266
+
3267
+
WARN_ON(sdev->device->phys_port_cnt
3268
+
> sizeof(sdev->port)/sizeof(sdev->port[0]));
3269
+
3270
+
for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
3271
+
sport = &sdev->port[i - 1];
3272
+
sport->sdev = sdev;
3273
+
sport->port = i;
3274
+
sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
3275
+
sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
3276
+
sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
3277
+
INIT_WORK(&sport->work, srpt_refresh_port_work);
3278
+
INIT_LIST_HEAD(&sport->port_acl_list);
3279
+
spin_lock_init(&sport->port_acl_lock);
3280
+
3281
+
if (srpt_refresh_port(sport)) {
3282
+
printk(KERN_ERR "MAD registration failed for %s-%d.\n",
3283
+
srpt_sdev_name(sdev), i);
3284
+
goto err_ring;
3285
+
}
3286
+
snprintf(sport->port_guid, sizeof(sport->port_guid),
3287
+
"0x%016llx%016llx",
3288
+
be64_to_cpu(sport->gid.global.subnet_prefix),
3289
+
be64_to_cpu(sport->gid.global.interface_id));
3290
+
}
3291
+
3292
+
spin_lock(&srpt_dev_lock);
3293
+
list_add_tail(&sdev->list, &srpt_dev_list);
3294
+
spin_unlock(&srpt_dev_lock);
3295
+
3296
+
out:
3297
+
ib_set_client_data(device, &srpt_client, sdev);
3298
+
pr_debug("added %s.\n", device->name);
3299
+
return;
3300
+
3301
+
err_ring:
3302
+
srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
3303
+
sdev->srq_size, srp_max_req_size,
3304
+
DMA_FROM_DEVICE);
3305
+
err_event:
3306
+
ib_unregister_event_handler(&sdev->event_handler);
3307
+
err_cm:
3308
+
ib_destroy_cm_id(sdev->cm_id);
3309
+
err_srq:
3310
+
ib_destroy_srq(sdev->srq);
3311
+
err_mr:
3312
+
ib_dereg_mr(sdev->mr);
3313
+
err_pd:
3314
+
ib_dealloc_pd(sdev->pd);
3315
+
free_dev:
3316
+
kfree(sdev);
3317
+
err:
3318
+
sdev = NULL;
3319
+
printk(KERN_INFO "%s(%s) failed.\n", __func__, device->name);
3320
+
goto out;
3321
+
}
3322
+
3323
+
/**
3324
+
* srpt_remove_one() - InfiniBand device removal callback function.
3325
+
*/
3326
+
static void srpt_remove_one(struct ib_device *device)
3327
+
{
3328
+
struct srpt_device *sdev;
3329
+
int i;
3330
+
3331
+
sdev = ib_get_client_data(device, &srpt_client);
3332
+
if (!sdev) {
3333
+
printk(KERN_INFO "%s(%s): nothing to do.\n", __func__,
3334
+
device->name);
3335
+
return;
3336
+
}
3337
+
3338
+
srpt_unregister_mad_agent(sdev);
3339
+
3340
+
ib_unregister_event_handler(&sdev->event_handler);
3341
+
3342
+
/* Cancel any work queued by the just unregistered IB event handler. */
3343
+
for (i = 0; i < sdev->device->phys_port_cnt; i++)
3344
+
cancel_work_sync(&sdev->port[i].work);
3345
+
3346
+
ib_destroy_cm_id(sdev->cm_id);
3347
+
3348
+
/*
3349
+
* Unregistering a target must happen after destroying sdev->cm_id
3350
+
* such that no new SRP_LOGIN_REQ information units can arrive while
3351
+
* destroying the target.
3352
+
*/
3353
+
spin_lock(&srpt_dev_lock);
3354
+
list_del(&sdev->list);
3355
+
spin_unlock(&srpt_dev_lock);
3356
+
srpt_release_sdev(sdev);
3357
+
3358
+
ib_destroy_srq(sdev->srq);
3359
+
ib_dereg_mr(sdev->mr);
3360
+
ib_dealloc_pd(sdev->pd);
3361
+
3362
+
srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
3363
+
sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
3364
+
sdev->ioctx_ring = NULL;
3365
+
kfree(sdev);
3366
+
}
3367
+
3368
+
static struct ib_client srpt_client = {
3369
+
.name = DRV_NAME,
3370
+
.add = srpt_add_one,
3371
+
.remove = srpt_remove_one
3372
+
};
3373
+
3374
+
static int srpt_check_true(struct se_portal_group *se_tpg)
3375
+
{
3376
+
return 1;
3377
+
}
3378
+
3379
+
static int srpt_check_false(struct se_portal_group *se_tpg)
3380
+
{
3381
+
return 0;
3382
+
}
3383
+
3384
+
static char *srpt_get_fabric_name(void)
3385
+
{
3386
+
return "srpt";
3387
+
}
3388
+
3389
+
static u8 srpt_get_fabric_proto_ident(struct se_portal_group *se_tpg)
3390
+
{
3391
+
return SCSI_TRANSPORTID_PROTOCOLID_SRP;
3392
+
}
3393
+
3394
+
static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
3395
+
{
3396
+
struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1);
3397
+
3398
+
return sport->port_guid;
3399
+
}
3400
+
3401
+
static u16 srpt_get_tag(struct se_portal_group *tpg)
3402
+
{
3403
+
return 1;
3404
+
}
3405
+
3406
+
static u32 srpt_get_default_depth(struct se_portal_group *se_tpg)
3407
+
{
3408
+
return 1;
3409
+
}
3410
+
3411
+
static u32 srpt_get_pr_transport_id(struct se_portal_group *se_tpg,
3412
+
struct se_node_acl *se_nacl,
3413
+
struct t10_pr_registration *pr_reg,
3414
+
int *format_code, unsigned char *buf)
3415
+
{
3416
+
struct srpt_node_acl *nacl;
3417
+
struct spc_rdma_transport_id *tr_id;
3418
+
3419
+
nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3420
+
tr_id = (void *)buf;
3421
+
tr_id->protocol_identifier = SCSI_TRANSPORTID_PROTOCOLID_SRP;
3422
+
memcpy(tr_id->i_port_id, nacl->i_port_id, sizeof(tr_id->i_port_id));
3423
+
return sizeof(*tr_id);
3424
+
}
3425
+
3426
+
static u32 srpt_get_pr_transport_id_len(struct se_portal_group *se_tpg,
3427
+
struct se_node_acl *se_nacl,
3428
+
struct t10_pr_registration *pr_reg,
3429
+
int *format_code)
3430
+
{
3431
+
*format_code = 0;
3432
+
return sizeof(struct spc_rdma_transport_id);
3433
+
}
3434
+
3435
+
static char *srpt_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
3436
+
const char *buf, u32 *out_tid_len,
3437
+
char **port_nexus_ptr)
3438
+
{
3439
+
struct spc_rdma_transport_id *tr_id;
3440
+
3441
+
*port_nexus_ptr = NULL;
3442
+
*out_tid_len = sizeof(struct spc_rdma_transport_id);
3443
+
tr_id = (void *)buf;
3444
+
return (char *)tr_id->i_port_id;
3445
+
}
3446
+
3447
+
static struct se_node_acl *srpt_alloc_fabric_acl(struct se_portal_group *se_tpg)
3448
+
{
3449
+
struct srpt_node_acl *nacl;
3450
+
3451
+
nacl = kzalloc(sizeof(struct srpt_node_acl), GFP_KERNEL);
3452
+
if (!nacl) {
3453
+
printk(KERN_ERR "Unable to alocate struct srpt_node_acl\n");
3454
+
return NULL;
3455
+
}
3456
+
3457
+
return &nacl->nacl;
3458
+
}
3459
+
3460
+
static void srpt_release_fabric_acl(struct se_portal_group *se_tpg,
3461
+
struct se_node_acl *se_nacl)
3462
+
{
3463
+
struct srpt_node_acl *nacl;
3464
+
3465
+
nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3466
+
kfree(nacl);
3467
+
}
3468
+
3469
+
static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
3470
+
{
3471
+
return 1;
3472
+
}
3473
+
3474
+
static void srpt_release_cmd(struct se_cmd *se_cmd)
3475
+
{
3476
+
}
3477
+
3478
+
/**
3479
+
* srpt_shutdown_session() - Whether or not a session may be shut down.
3480
+
*/
3481
+
static int srpt_shutdown_session(struct se_session *se_sess)
3482
+
{
3483
+
return true;
3484
+
}
3485
+
3486
+
/**
3487
+
* srpt_close_session() - Forcibly close a session.
3488
+
*
3489
+
* Callback function invoked by the TCM core to clean up sessions associated
3490
+
* with a node ACL when the user invokes
3491
+
* rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3492
+
*/
3493
+
static void srpt_close_session(struct se_session *se_sess)
3494
+
{
3495
+
DECLARE_COMPLETION_ONSTACK(release_done);
3496
+
struct srpt_rdma_ch *ch;
3497
+
struct srpt_device *sdev;
3498
+
int res;
3499
+
3500
+
ch = se_sess->fabric_sess_ptr;
3501
+
WARN_ON(ch->sess != se_sess);
3502
+
3503
+
pr_debug("ch %p state %d\n", ch, srpt_get_ch_state(ch));
3504
+
3505
+
sdev = ch->sport->sdev;
3506
+
spin_lock_irq(&sdev->spinlock);
3507
+
BUG_ON(ch->release_done);
3508
+
ch->release_done = &release_done;
3509
+
__srpt_close_ch(ch);
3510
+
spin_unlock_irq(&sdev->spinlock);
3511
+
3512
+
res = wait_for_completion_timeout(&release_done, 60 * HZ);
3513
+
WARN_ON(res <= 0);
3514
+
}
3515
+
3516
+
/**
3517
+
* To do: Find out whether stop_session() has a meaning for transports
3518
+
* other than iSCSI.
3519
+
*/
3520
+
static void srpt_stop_session(struct se_session *se_sess, int sess_sleep,
3521
+
int conn_sleep)
3522
+
{
3523
+
}
3524
+
3525
+
static void srpt_reset_nexus(struct se_session *sess)
3526
+
{
3527
+
printk(KERN_ERR "This is the SRP protocol, not iSCSI\n");
3528
+
}
3529
+
3530
+
static int srpt_sess_logged_in(struct se_session *se_sess)
3531
+
{
3532
+
return true;
3533
+
}
3534
+
3535
+
/**
3536
+
* srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB).
3537
+
*
3538
+
* A quote from RFC 4455 (SCSI-MIB) about this MIB object:
3539
+
* This object represents an arbitrary integer used to uniquely identify a
3540
+
* particular attached remote initiator port to a particular SCSI target port
3541
+
* within a particular SCSI target device within a particular SCSI instance.
3542
+
*/
3543
+
static u32 srpt_sess_get_index(struct se_session *se_sess)
3544
+
{
3545
+
return 0;
3546
+
}
3547
+
3548
+
static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
3549
+
{
3550
+
}
3551
+
3552
+
static u32 srpt_get_task_tag(struct se_cmd *se_cmd)
3553
+
{
3554
+
struct srpt_send_ioctx *ioctx;
3555
+
3556
+
ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
3557
+
return ioctx->tag;
3558
+
}
3559
+
3560
+
/* Note: only used from inside debug printk's by the TCM core. */
3561
+
static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
3562
+
{
3563
+
struct srpt_send_ioctx *ioctx;
3564
+
3565
+
ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
3566
+
return srpt_get_cmd_state(ioctx);
3567
+
}
3568
+
3569
+
static u16 srpt_set_fabric_sense_len(struct se_cmd *cmd, u32 sense_length)
3570
+
{
3571
+
return 0;
3572
+
}
3573
+
3574
+
static u16 srpt_get_fabric_sense_len(void)
3575
+
{
3576
+
return 0;
3577
+
}
3578
+
3579
+
static int srpt_is_state_remove(struct se_cmd *se_cmd)
3580
+
{
3581
+
return 0;
3582
+
}
3583
+
3584
+
/**
3585
+
* srpt_parse_i_port_id() - Parse an initiator port ID.
3586
+
* @name: ASCII representation of a 128-bit initiator port ID.
3587
+
* @i_port_id: Binary 128-bit port ID.
3588
+
*/
3589
+
static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
3590
+
{
3591
+
const char *p;
3592
+
unsigned len, count, leading_zero_bytes;
3593
+
int ret, rc;
3594
+
3595
+
p = name;
3596
+
if (strnicmp(p, "0x", 2) == 0)
3597
+
p += 2;
3598
+
ret = -EINVAL;
3599
+
len = strlen(p);
3600
+
if (len % 2)
3601
+
goto out;
3602
+
count = min(len / 2, 16U);
3603
+
leading_zero_bytes = 16 - count;
3604
+
memset(i_port_id, 0, leading_zero_bytes);
3605
+
rc = hex2bin(i_port_id + leading_zero_bytes, p, count);
3606
+
if (rc < 0)
3607
+
pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc);
3608
+
ret = 0;
3609
+
out:
3610
+
return ret;
3611
+
}
3612
+
3613
+
/*
3614
+
* configfs callback function invoked for
3615
+
* mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3616
+
*/
3617
+
static struct se_node_acl *srpt_make_nodeacl(struct se_portal_group *tpg,
3618
+
struct config_group *group,
3619
+
const char *name)
3620
+
{
3621
+
struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1);
3622
+
struct se_node_acl *se_nacl, *se_nacl_new;
3623
+
struct srpt_node_acl *nacl;
3624
+
int ret = 0;
3625
+
u32 nexus_depth = 1;
3626
+
u8 i_port_id[16];
3627
+
3628
+
if (srpt_parse_i_port_id(i_port_id, name) < 0) {
3629
+
printk(KERN_ERR "invalid initiator port ID %s\n", name);
3630
+
ret = -EINVAL;
3631
+
goto err;
3632
+
}
3633
+
3634
+
se_nacl_new = srpt_alloc_fabric_acl(tpg);
3635
+
if (!se_nacl_new) {
3636
+
ret = -ENOMEM;
3637
+
goto err;
3638
+
}
3639
+
/*
3640
+
* nacl_new may be released by core_tpg_add_initiator_node_acl()
3641
+
* when converting a node ACL from demo mode to explict
3642
+
*/
3643
+
se_nacl = core_tpg_add_initiator_node_acl(tpg, se_nacl_new, name,
3644
+
nexus_depth);
3645
+
if (IS_ERR(se_nacl)) {
3646
+
ret = PTR_ERR(se_nacl);
3647
+
goto err;
3648
+
}
3649
+
/* Locate our struct srpt_node_acl and set sdev and i_port_id. */
3650
+
nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3651
+
memcpy(&nacl->i_port_id[0], &i_port_id[0], 16);
3652
+
nacl->sport = sport;
3653
+
3654
+
spin_lock_irq(&sport->port_acl_lock);
3655
+
list_add_tail(&nacl->list, &sport->port_acl_list);
3656
+
spin_unlock_irq(&sport->port_acl_lock);
3657
+
3658
+
return se_nacl;
3659
+
err:
3660
+
return ERR_PTR(ret);
3661
+
}
3662
+
3663
+
/*
3664
+
* configfs callback function invoked for
3665
+
* rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3666
+
*/
3667
+
static void srpt_drop_nodeacl(struct se_node_acl *se_nacl)
3668
+
{
3669
+
struct srpt_node_acl *nacl;
3670
+
struct srpt_device *sdev;
3671
+
struct srpt_port *sport;
3672
+
3673
+
nacl = container_of(se_nacl, struct srpt_node_acl, nacl);
3674
+
sport = nacl->sport;
3675
+
sdev = sport->sdev;
3676
+
spin_lock_irq(&sport->port_acl_lock);
3677
+
list_del(&nacl->list);
3678
+
spin_unlock_irq(&sport->port_acl_lock);
3679
+
core_tpg_del_initiator_node_acl(&sport->port_tpg_1, se_nacl, 1);
3680
+
srpt_release_fabric_acl(NULL, se_nacl);
3681
+
}
3682
+
3683
+
static ssize_t srpt_tpg_attrib_show_srp_max_rdma_size(
3684
+
struct se_portal_group *se_tpg,
3685
+
char *page)
3686
+
{
3687
+
struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3688
+
3689
+
return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
3690
+
}
3691
+
3692
+
static ssize_t srpt_tpg_attrib_store_srp_max_rdma_size(
3693
+
struct se_portal_group *se_tpg,
3694
+
const char *page,
3695
+
size_t count)
3696
+
{
3697
+
struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3698
+
unsigned long val;
3699
+
int ret;
3700
+
3701
+
ret = strict_strtoul(page, 0, &val);
3702
+
if (ret < 0) {
3703
+
pr_err("strict_strtoul() failed with ret: %d\n", ret);
3704
+
return -EINVAL;
3705
+
}
3706
+
if (val > MAX_SRPT_RDMA_SIZE) {
3707
+
pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
3708
+
MAX_SRPT_RDMA_SIZE);
3709
+
return -EINVAL;
3710
+
}
3711
+
if (val < DEFAULT_MAX_RDMA_SIZE) {
3712
+
pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
3713
+
val, DEFAULT_MAX_RDMA_SIZE);
3714
+
return -EINVAL;
3715
+
}
3716
+
sport->port_attrib.srp_max_rdma_size = val;
3717
+
3718
+
return count;
3719
+
}
3720
+
3721
+
TF_TPG_ATTRIB_ATTR(srpt, srp_max_rdma_size, S_IRUGO | S_IWUSR);
3722
+
3723
+
static ssize_t srpt_tpg_attrib_show_srp_max_rsp_size(
3724
+
struct se_portal_group *se_tpg,
3725
+
char *page)
3726
+
{
3727
+
struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3728
+
3729
+
return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
3730
+
}
3731
+
3732
+
static ssize_t srpt_tpg_attrib_store_srp_max_rsp_size(
3733
+
struct se_portal_group *se_tpg,
3734
+
const char *page,
3735
+
size_t count)
3736
+
{
3737
+
struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3738
+
unsigned long val;
3739
+
int ret;
3740
+
3741
+
ret = strict_strtoul(page, 0, &val);
3742
+
if (ret < 0) {
3743
+
pr_err("strict_strtoul() failed with ret: %d\n", ret);
3744
+
return -EINVAL;
3745
+
}
3746
+
if (val > MAX_SRPT_RSP_SIZE) {
3747
+
pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
3748
+
MAX_SRPT_RSP_SIZE);
3749
+
return -EINVAL;
3750
+
}
3751
+
if (val < MIN_MAX_RSP_SIZE) {
3752
+
pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
3753
+
MIN_MAX_RSP_SIZE);
3754
+
return -EINVAL;
3755
+
}
3756
+
sport->port_attrib.srp_max_rsp_size = val;
3757
+
3758
+
return count;
3759
+
}
3760
+
3761
+
TF_TPG_ATTRIB_ATTR(srpt, srp_max_rsp_size, S_IRUGO | S_IWUSR);
3762
+
3763
+
static ssize_t srpt_tpg_attrib_show_srp_sq_size(
3764
+
struct se_portal_group *se_tpg,
3765
+
char *page)
3766
+
{
3767
+
struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3768
+
3769
+
return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size);
3770
+
}
3771
+
3772
+
static ssize_t srpt_tpg_attrib_store_srp_sq_size(
3773
+
struct se_portal_group *se_tpg,
3774
+
const char *page,
3775
+
size_t count)
3776
+
{
3777
+
struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3778
+
unsigned long val;
3779
+
int ret;
3780
+
3781
+
ret = strict_strtoul(page, 0, &val);
3782
+
if (ret < 0) {
3783
+
pr_err("strict_strtoul() failed with ret: %d\n", ret);
3784
+
return -EINVAL;
3785
+
}
3786
+
if (val > MAX_SRPT_SRQ_SIZE) {
3787
+
pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
3788
+
MAX_SRPT_SRQ_SIZE);
3789
+
return -EINVAL;
3790
+
}
3791
+
if (val < MIN_SRPT_SRQ_SIZE) {
3792
+
pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
3793
+
MIN_SRPT_SRQ_SIZE);
3794
+
return -EINVAL;
3795
+
}
3796
+
sport->port_attrib.srp_sq_size = val;
3797
+
3798
+
return count;
3799
+
}
3800
+
3801
+
TF_TPG_ATTRIB_ATTR(srpt, srp_sq_size, S_IRUGO | S_IWUSR);
3802
+
3803
+
static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
3804
+
&srpt_tpg_attrib_srp_max_rdma_size.attr,
3805
+
&srpt_tpg_attrib_srp_max_rsp_size.attr,
3806
+
&srpt_tpg_attrib_srp_sq_size.attr,
3807
+
NULL,
3808
+
};
3809
+
3810
+
static ssize_t srpt_tpg_show_enable(
3811
+
struct se_portal_group *se_tpg,
3812
+
char *page)
3813
+
{
3814
+
struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3815
+
3816
+
return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0);
3817
+
}
3818
+
3819
+
static ssize_t srpt_tpg_store_enable(
3820
+
struct se_portal_group *se_tpg,
3821
+
const char *page,
3822
+
size_t count)
3823
+
{
3824
+
struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3825
+
unsigned long tmp;
3826
+
int ret;
3827
+
3828
+
ret = strict_strtoul(page, 0, &tmp);
3829
+
if (ret < 0) {
3830
+
printk(KERN_ERR "Unable to extract srpt_tpg_store_enable\n");
3831
+
return -EINVAL;
3832
+
}
3833
+
3834
+
if ((tmp != 0) && (tmp != 1)) {
3835
+
printk(KERN_ERR "Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
3836
+
return -EINVAL;
3837
+
}
3838
+
if (tmp == 1)
3839
+
sport->enabled = true;
3840
+
else
3841
+
sport->enabled = false;
3842
+
3843
+
return count;
3844
+
}
3845
+
3846
+
TF_TPG_BASE_ATTR(srpt, enable, S_IRUGO | S_IWUSR);
3847
+
3848
+
static struct configfs_attribute *srpt_tpg_attrs[] = {
3849
+
&srpt_tpg_enable.attr,
3850
+
NULL,
3851
+
};
3852
+
3853
+
/**
3854
+
* configfs callback invoked for
3855
+
* mkdir /sys/kernel/config/target/$driver/$port/$tpg
3856
+
*/
3857
+
static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
3858
+
struct config_group *group,
3859
+
const char *name)
3860
+
{
3861
+
struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3862
+
int res;
3863
+
3864
+
/* Initialize sport->port_wwn and sport->port_tpg_1 */
3865
+
res = core_tpg_register(&srpt_target->tf_ops, &sport->port_wwn,
3866
+
&sport->port_tpg_1, sport, TRANSPORT_TPG_TYPE_NORMAL);
3867
+
if (res)
3868
+
return ERR_PTR(res);
3869
+
3870
+
return &sport->port_tpg_1;
3871
+
}
3872
+
3873
+
/**
3874
+
* configfs callback invoked for
3875
+
* rmdir /sys/kernel/config/target/$driver/$port/$tpg
3876
+
*/
3877
+
static void srpt_drop_tpg(struct se_portal_group *tpg)
3878
+
{
3879
+
struct srpt_port *sport = container_of(tpg,
3880
+
struct srpt_port, port_tpg_1);
3881
+
3882
+
sport->enabled = false;
3883
+
core_tpg_deregister(&sport->port_tpg_1);
3884
+
}
3885
+
3886
+
/**
3887
+
* configfs callback invoked for
3888
+
* mkdir /sys/kernel/config/target/$driver/$port
3889
+
*/
3890
+
static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
3891
+
struct config_group *group,
3892
+
const char *name)
3893
+
{
3894
+
struct srpt_port *sport;
3895
+
int ret;
3896
+
3897
+
sport = srpt_lookup_port(name);
3898
+
pr_debug("make_tport(%s)\n", name);
3899
+
ret = -EINVAL;
3900
+
if (!sport)
3901
+
goto err;
3902
+
3903
+
return &sport->port_wwn;
3904
+
3905
+
err:
3906
+
return ERR_PTR(ret);
3907
+
}
3908
+
3909
+
/**
3910
+
* configfs callback invoked for
3911
+
* rmdir /sys/kernel/config/target/$driver/$port
3912
+
*/
3913
+
static void srpt_drop_tport(struct se_wwn *wwn)
3914
+
{
3915
+
struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3916
+
3917
+
pr_debug("drop_tport(%s\n", config_item_name(&sport->port_wwn.wwn_group.cg_item));
3918
+
}
3919
+
3920
+
static ssize_t srpt_wwn_show_attr_version(struct target_fabric_configfs *tf,
3921
+
char *buf)
3922
+
{
3923
+
return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION);
3924
+
}
3925
+
3926
+
TF_WWN_ATTR_RO(srpt, version);
3927
+
3928
+
static struct configfs_attribute *srpt_wwn_attrs[] = {
3929
+
&srpt_wwn_version.attr,
3930
+
NULL,
3931
+
};
3932
+
3933
+
static struct target_core_fabric_ops srpt_template = {
3934
+
.get_fabric_name = srpt_get_fabric_name,
3935
+
.get_fabric_proto_ident = srpt_get_fabric_proto_ident,
3936
+
.tpg_get_wwn = srpt_get_fabric_wwn,
3937
+
.tpg_get_tag = srpt_get_tag,
3938
+
.tpg_get_default_depth = srpt_get_default_depth,
3939
+
.tpg_get_pr_transport_id = srpt_get_pr_transport_id,
3940
+
.tpg_get_pr_transport_id_len = srpt_get_pr_transport_id_len,
3941
+
.tpg_parse_pr_out_transport_id = srpt_parse_pr_out_transport_id,
3942
+
.tpg_check_demo_mode = srpt_check_false,
3943
+
.tpg_check_demo_mode_cache = srpt_check_true,
3944
+
.tpg_check_demo_mode_write_protect = srpt_check_true,
3945
+
.tpg_check_prod_mode_write_protect = srpt_check_false,
3946
+
.tpg_alloc_fabric_acl = srpt_alloc_fabric_acl,
3947
+
.tpg_release_fabric_acl = srpt_release_fabric_acl,
3948
+
.tpg_get_inst_index = srpt_tpg_get_inst_index,
3949
+
.release_cmd = srpt_release_cmd,
3950
+
.check_stop_free = srpt_check_stop_free,
3951
+
.shutdown_session = srpt_shutdown_session,
3952
+
.close_session = srpt_close_session,
3953
+
.stop_session = srpt_stop_session,
3954
+
.fall_back_to_erl0 = srpt_reset_nexus,
3955
+
.sess_logged_in = srpt_sess_logged_in,
3956
+
.sess_get_index = srpt_sess_get_index,
3957
+
.sess_get_initiator_sid = NULL,
3958
+
.write_pending = srpt_write_pending,
3959
+
.write_pending_status = srpt_write_pending_status,
3960
+
.set_default_node_attributes = srpt_set_default_node_attrs,
3961
+
.get_task_tag = srpt_get_task_tag,
3962
+
.get_cmd_state = srpt_get_tcm_cmd_state,
3963
+
.queue_data_in = srpt_queue_response,
3964
+
.queue_status = srpt_queue_status,
3965
+
.queue_tm_rsp = srpt_queue_response,
3966
+
.get_fabric_sense_len = srpt_get_fabric_sense_len,
3967
+
.set_fabric_sense_len = srpt_set_fabric_sense_len,
3968
+
.is_state_remove = srpt_is_state_remove,
3969
+
/*
3970
+
* Setup function pointers for generic logic in
3971
+
* target_core_fabric_configfs.c
3972
+
*/
3973
+
.fabric_make_wwn = srpt_make_tport,
3974
+
.fabric_drop_wwn = srpt_drop_tport,
3975
+
.fabric_make_tpg = srpt_make_tpg,
3976
+
.fabric_drop_tpg = srpt_drop_tpg,
3977
+
.fabric_post_link = NULL,
3978
+
.fabric_pre_unlink = NULL,
3979
+
.fabric_make_np = NULL,
3980
+
.fabric_drop_np = NULL,
3981
+
.fabric_make_nodeacl = srpt_make_nodeacl,
3982
+
.fabric_drop_nodeacl = srpt_drop_nodeacl,
3983
+
};
3984
+
3985
+
/**
3986
+
* srpt_init_module() - Kernel module initialization.
3987
+
*
3988
+
* Note: Since ib_register_client() registers callback functions, and since at
3989
+
* least one of these callback functions (srpt_add_one()) calls target core
3990
+
* functions, this driver must be registered with the target core before
3991
+
* ib_register_client() is called.
3992
+
*/
3993
+
static int __init srpt_init_module(void)
3994
+
{
3995
+
int ret;
3996
+
3997
+
ret = -EINVAL;
3998
+
if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
3999
+
printk(KERN_ERR "invalid value %d for kernel module parameter"
4000
+
" srp_max_req_size -- must be at least %d.\n",
4001
+
srp_max_req_size, MIN_MAX_REQ_SIZE);
4002
+
goto out;
4003
+
}
4004
+
4005
+
if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
4006
+
|| srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
4007
+
printk(KERN_ERR "invalid value %d for kernel module parameter"
4008
+
" srpt_srq_size -- must be in the range [%d..%d].\n",
4009
+
srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
4010
+
goto out;
4011
+
}
4012
+
4013
+
spin_lock_init(&srpt_dev_lock);
4014
+
INIT_LIST_HEAD(&srpt_dev_list);
4015
+
4016
+
ret = -ENODEV;
4017
+
srpt_target = target_fabric_configfs_init(THIS_MODULE, "srpt");
4018
+
if (!srpt_target) {
4019
+
printk(KERN_ERR "couldn't register\n");
4020
+
goto out;
4021
+
}
4022
+
4023
+
srpt_target->tf_ops = srpt_template;
4024
+
4025
+
/* Enable SG chaining */
4026
+
srpt_target->tf_ops.task_sg_chaining = true;
4027
+
4028
+
/*
4029
+
* Set up default attribute lists.
4030
+
*/
4031
+
srpt_target->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = srpt_wwn_attrs;
4032
+
srpt_target->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = srpt_tpg_attrs;
4033
+
srpt_target->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = srpt_tpg_attrib_attrs;
4034
+
srpt_target->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
4035
+
srpt_target->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
4036
+
srpt_target->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
4037
+
srpt_target->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
4038
+
srpt_target->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
4039
+
srpt_target->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
4040
+
4041
+
ret = target_fabric_configfs_register(srpt_target);
4042
+
if (ret < 0) {
4043
+
printk(KERN_ERR "couldn't register\n");
4044
+
goto out_free_target;
4045
+
}
4046
+
4047
+
ret = ib_register_client(&srpt_client);
4048
+
if (ret) {
4049
+
printk(KERN_ERR "couldn't register IB client\n");
4050
+
goto out_unregister_target;
4051
+
}
4052
+
4053
+
return 0;
4054
+
4055
+
out_unregister_target:
4056
+
target_fabric_configfs_deregister(srpt_target);
4057
+
srpt_target = NULL;
4058
+
out_free_target:
4059
+
if (srpt_target)
4060
+
target_fabric_configfs_free(srpt_target);
4061
+
out:
4062
+
return ret;
4063
+
}
4064
+
4065
+
static void __exit srpt_cleanup_module(void)
4066
+
{
4067
+
ib_unregister_client(&srpt_client);
4068
+
target_fabric_configfs_deregister(srpt_target);
4069
+
srpt_target = NULL;
4070
+
}
4071
+
4072
+
module_init(srpt_init_module);
4073
+
module_exit(srpt_cleanup_module);
+444
drivers/infiniband/ulp/srpt/ib_srpt.h
+444
drivers/infiniband/ulp/srpt/ib_srpt.h
···
1
+
/*
2
+
* Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
3
+
* Copyright (C) 2009 - 2010 Bart Van Assche <bvanassche@acm.org>.
4
+
*
5
+
* This software is available to you under a choice of one of two
6
+
* licenses. You may choose to be licensed under the terms of the GNU
7
+
* General Public License (GPL) Version 2, available from the file
8
+
* COPYING in the main directory of this source tree, or the
9
+
* OpenIB.org BSD license below:
10
+
*
11
+
* Redistribution and use in source and binary forms, with or
12
+
* without modification, are permitted provided that the following
13
+
* conditions are met:
14
+
*
15
+
* - Redistributions of source code must retain the above
16
+
* copyright notice, this list of conditions and the following
17
+
* disclaimer.
18
+
*
19
+
* - Redistributions in binary form must reproduce the above
20
+
* copyright notice, this list of conditions and the following
21
+
* disclaimer in the documentation and/or other materials
22
+
* provided with the distribution.
23
+
*
24
+
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25
+
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26
+
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27
+
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28
+
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29
+
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30
+
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31
+
* SOFTWARE.
32
+
*
33
+
*/
34
+
35
+
#ifndef IB_SRPT_H
36
+
#define IB_SRPT_H
37
+
38
+
#include <linux/version.h>
39
+
#include <linux/types.h>
40
+
#include <linux/list.h>
41
+
#include <linux/wait.h>
42
+
43
+
#include <rdma/ib_verbs.h>
44
+
#include <rdma/ib_sa.h>
45
+
#include <rdma/ib_cm.h>
46
+
47
+
#include <scsi/srp.h>
48
+
49
+
#include "ib_dm_mad.h"
50
+
51
+
/*
52
+
* The prefix the ServiceName field must start with in the device management
53
+
* ServiceEntries attribute pair. See also the SRP specification.
54
+
*/
55
+
#define SRP_SERVICE_NAME_PREFIX "SRP.T10:"
56
+
57
+
enum {
58
+
/*
59
+
* SRP IOControllerProfile attributes for SRP target ports that have
60
+
* not been defined in <scsi/srp.h>. Source: section B.7, table B.7
61
+
* in the SRP specification.
62
+
*/
63
+
SRP_PROTOCOL = 0x0108,
64
+
SRP_PROTOCOL_VERSION = 0x0001,
65
+
SRP_IO_SUBCLASS = 0x609e,
66
+
SRP_SEND_TO_IOC = 0x01,
67
+
SRP_SEND_FROM_IOC = 0x02,
68
+
SRP_RDMA_READ_FROM_IOC = 0x08,
69
+
SRP_RDMA_WRITE_FROM_IOC = 0x20,
70
+
71
+
/*
72
+
* srp_login_cmd.req_flags bitmasks. See also table 9 in the SRP
73
+
* specification.
74
+
*/
75
+
SRP_MTCH_ACTION = 0x03, /* MULTI-CHANNEL ACTION */
76
+
SRP_LOSOLNT = 0x10, /* logout solicited notification */
77
+
SRP_CRSOLNT = 0x20, /* credit request solicited notification */
78
+
SRP_AESOLNT = 0x40, /* asynchronous event solicited notification */
79
+
80
+
/*
81
+
* srp_cmd.sol_nt / srp_tsk_mgmt.sol_not bitmasks. See also tables
82
+
* 18 and 20 in the SRP specification.
83
+
*/
84
+
SRP_SCSOLNT = 0x02, /* SCSOLNT = successful solicited notification */
85
+
SRP_UCSOLNT = 0x04, /* UCSOLNT = unsuccessful solicited notification */
86
+
87
+
/*
88
+
* srp_rsp.sol_not / srp_t_logout.sol_not bitmasks. See also tables
89
+
* 16 and 22 in the SRP specification.
90
+
*/
91
+
SRP_SOLNT = 0x01, /* SOLNT = solicited notification */
92
+
93
+
/* See also table 24 in the SRP specification. */
94
+
SRP_TSK_MGMT_SUCCESS = 0x00,
95
+
SRP_TSK_MGMT_FUNC_NOT_SUPP = 0x04,
96
+
SRP_TSK_MGMT_FAILED = 0x05,
97
+
98
+
/* See also table 21 in the SRP specification. */
99
+
SRP_CMD_SIMPLE_Q = 0x0,
100
+
SRP_CMD_HEAD_OF_Q = 0x1,
101
+
SRP_CMD_ORDERED_Q = 0x2,
102
+
SRP_CMD_ACA = 0x4,
103
+
104
+
SRP_LOGIN_RSP_MULTICHAN_NO_CHAN = 0x0,
105
+
SRP_LOGIN_RSP_MULTICHAN_TERMINATED = 0x1,
106
+
SRP_LOGIN_RSP_MULTICHAN_MAINTAINED = 0x2,
107
+
108
+
SRPT_DEF_SG_TABLESIZE = 128,
109
+
SRPT_DEF_SG_PER_WQE = 16,
110
+
111
+
MIN_SRPT_SQ_SIZE = 16,
112
+
DEF_SRPT_SQ_SIZE = 4096,
113
+
SRPT_RQ_SIZE = 128,
114
+
MIN_SRPT_SRQ_SIZE = 4,
115
+
DEFAULT_SRPT_SRQ_SIZE = 4095,
116
+
MAX_SRPT_SRQ_SIZE = 65535,
117
+
MAX_SRPT_RDMA_SIZE = 1U << 24,
118
+
MAX_SRPT_RSP_SIZE = 1024,
119
+
120
+
MIN_MAX_REQ_SIZE = 996,
121
+
DEFAULT_MAX_REQ_SIZE
122
+
= sizeof(struct srp_cmd)/*48*/
123
+
+ sizeof(struct srp_indirect_buf)/*20*/
124
+
+ 128 * sizeof(struct srp_direct_buf)/*16*/,
125
+
126
+
MIN_MAX_RSP_SIZE = sizeof(struct srp_rsp)/*36*/ + 4,
127
+
DEFAULT_MAX_RSP_SIZE = 256, /* leaves 220 bytes for sense data */
128
+
129
+
DEFAULT_MAX_RDMA_SIZE = 65536,
130
+
};
131
+
132
+
enum srpt_opcode {
133
+
SRPT_RECV,
134
+
SRPT_SEND,
135
+
SRPT_RDMA_MID,
136
+
SRPT_RDMA_ABORT,
137
+
SRPT_RDMA_READ_LAST,
138
+
SRPT_RDMA_WRITE_LAST,
139
+
};
140
+
141
+
static inline u64 encode_wr_id(u8 opcode, u32 idx)
142
+
{
143
+
return ((u64)opcode << 32) | idx;
144
+
}
145
+
static inline enum srpt_opcode opcode_from_wr_id(u64 wr_id)
146
+
{
147
+
return wr_id >> 32;
148
+
}
149
+
static inline u32 idx_from_wr_id(u64 wr_id)
150
+
{
151
+
return (u32)wr_id;
152
+
}
153
+
154
+
struct rdma_iu {
155
+
u64 raddr;
156
+
u32 rkey;
157
+
struct ib_sge *sge;
158
+
u32 sge_cnt;
159
+
int mem_id;
160
+
};
161
+
162
+
/**
163
+
* enum srpt_command_state - SCSI command state managed by SRPT.
164
+
* @SRPT_STATE_NEW: New command arrived and is being processed.
165
+
* @SRPT_STATE_NEED_DATA: Processing a write or bidir command and waiting
166
+
* for data arrival.
167
+
* @SRPT_STATE_DATA_IN: Data for the write or bidir command arrived and is
168
+
* being processed.
169
+
* @SRPT_STATE_CMD_RSP_SENT: SRP_RSP for SRP_CMD has been sent.
170
+
* @SRPT_STATE_MGMT: Processing a SCSI task management command.
171
+
* @SRPT_STATE_MGMT_RSP_SENT: SRP_RSP for SRP_TSK_MGMT has been sent.
172
+
* @SRPT_STATE_DONE: Command processing finished successfully, command
173
+
* processing has been aborted or command processing
174
+
* failed.
175
+
*/
176
+
enum srpt_command_state {
177
+
SRPT_STATE_NEW = 0,
178
+
SRPT_STATE_NEED_DATA = 1,
179
+
SRPT_STATE_DATA_IN = 2,
180
+
SRPT_STATE_CMD_RSP_SENT = 3,
181
+
SRPT_STATE_MGMT = 4,
182
+
SRPT_STATE_MGMT_RSP_SENT = 5,
183
+
SRPT_STATE_DONE = 6,
184
+
};
185
+
186
+
/**
187
+
* struct srpt_ioctx - Shared SRPT I/O context information.
188
+
* @buf: Pointer to the buffer.
189
+
* @dma: DMA address of the buffer.
190
+
* @index: Index of the I/O context in its ioctx_ring array.
191
+
*/
192
+
struct srpt_ioctx {
193
+
void *buf;
194
+
dma_addr_t dma;
195
+
uint32_t index;
196
+
};
197
+
198
+
/**
199
+
* struct srpt_recv_ioctx - SRPT receive I/O context.
200
+
* @ioctx: See above.
201
+
* @wait_list: Node for insertion in srpt_rdma_ch.cmd_wait_list.
202
+
*/
203
+
struct srpt_recv_ioctx {
204
+
struct srpt_ioctx ioctx;
205
+
struct list_head wait_list;
206
+
};
207
+
208
+
/**
209
+
* struct srpt_send_ioctx - SRPT send I/O context.
210
+
* @ioctx: See above.
211
+
* @ch: Channel pointer.
212
+
* @free_list: Node in srpt_rdma_ch.free_list.
213
+
* @n_rbuf: Number of data buffers in the received SRP command.
214
+
* @rbufs: Pointer to SRP data buffer array.
215
+
* @single_rbuf: SRP data buffer if the command has only a single buffer.
216
+
* @sg: Pointer to sg-list associated with this I/O context.
217
+
* @sg_cnt: SG-list size.
218
+
* @mapped_sg_count: ib_dma_map_sg() return value.
219
+
* @n_rdma_ius: Number of elements in the rdma_ius array.
220
+
* @rdma_ius: Array with information about the RDMA mapping.
221
+
* @tag: Tag of the received SRP information unit.
222
+
* @spinlock: Protects 'state'.
223
+
* @state: I/O context state.
224
+
* @rdma_aborted: If initiating a multipart RDMA transfer failed, whether
225
+
* the already initiated transfers have finished.
226
+
* @cmd: Target core command data structure.
227
+
* @sense_data: SCSI sense data.
228
+
*/
229
+
struct srpt_send_ioctx {
230
+
struct srpt_ioctx ioctx;
231
+
struct srpt_rdma_ch *ch;
232
+
struct kref kref;
233
+
struct rdma_iu *rdma_ius;
234
+
struct srp_direct_buf *rbufs;
235
+
struct srp_direct_buf single_rbuf;
236
+
struct scatterlist *sg;
237
+
struct list_head free_list;
238
+
spinlock_t spinlock;
239
+
enum srpt_command_state state;
240
+
bool rdma_aborted;
241
+
struct se_cmd cmd;
242
+
struct completion tx_done;
243
+
u64 tag;
244
+
int sg_cnt;
245
+
int mapped_sg_count;
246
+
u16 n_rdma_ius;
247
+
u8 n_rdma;
248
+
u8 n_rbuf;
249
+
bool queue_status_only;
250
+
u8 sense_data[SCSI_SENSE_BUFFERSIZE];
251
+
};
252
+
253
+
/**
254
+
* enum rdma_ch_state - SRP channel state.
255
+
* @CH_CONNECTING: QP is in RTR state; waiting for RTU.
256
+
* @CH_LIVE: QP is in RTS state.
257
+
* @CH_DISCONNECTING: DREQ has been received; waiting for DREP
258
+
* or DREQ has been send and waiting for DREP
259
+
* or .
260
+
* @CH_DRAINING: QP is in ERR state; waiting for last WQE event.
261
+
* @CH_RELEASING: Last WQE event has been received; releasing resources.
262
+
*/
263
+
enum rdma_ch_state {
264
+
CH_CONNECTING,
265
+
CH_LIVE,
266
+
CH_DISCONNECTING,
267
+
CH_DRAINING,
268
+
CH_RELEASING
269
+
};
270
+
271
+
/**
272
+
* struct srpt_rdma_ch - RDMA channel.
273
+
* @wait_queue: Allows the kernel thread to wait for more work.
274
+
* @thread: Kernel thread that processes the IB queues associated with
275
+
* the channel.
276
+
* @cm_id: IB CM ID associated with the channel.
277
+
* @qp: IB queue pair used for communicating over this channel.
278
+
* @cq: IB completion queue for this channel.
279
+
* @rq_size: IB receive queue size.
280
+
* @rsp_size IB response message size in bytes.
281
+
* @sq_wr_avail: number of work requests available in the send queue.
282
+
* @sport: pointer to the information of the HCA port used by this
283
+
* channel.
284
+
* @i_port_id: 128-bit initiator port identifier copied from SRP_LOGIN_REQ.
285
+
* @t_port_id: 128-bit target port identifier copied from SRP_LOGIN_REQ.
286
+
* @max_ti_iu_len: maximum target-to-initiator information unit length.
287
+
* @req_lim: request limit: maximum number of requests that may be sent
288
+
* by the initiator without having received a response.
289
+
* @req_lim_delta: Number of credits not yet sent back to the initiator.
290
+
* @spinlock: Protects free_list and state.
291
+
* @free_list: Head of list with free send I/O contexts.
292
+
* @state: channel state. See also enum rdma_ch_state.
293
+
* @ioctx_ring: Send ring.
294
+
* @wc: IB work completion array for srpt_process_completion().
295
+
* @list: Node for insertion in the srpt_device.rch_list list.
296
+
* @cmd_wait_list: List of SCSI commands that arrived before the RTU event. This
297
+
* list contains struct srpt_ioctx elements and is protected
298
+
* against concurrent modification by the cm_id spinlock.
299
+
* @sess: Session information associated with this SRP channel.
300
+
* @sess_name: Session name.
301
+
* @release_work: Allows scheduling of srpt_release_channel().
302
+
* @release_done: Enables waiting for srpt_release_channel() completion.
303
+
*/
304
+
struct srpt_rdma_ch {
305
+
wait_queue_head_t wait_queue;
306
+
struct task_struct *thread;
307
+
struct ib_cm_id *cm_id;
308
+
struct ib_qp *qp;
309
+
struct ib_cq *cq;
310
+
int rq_size;
311
+
u32 rsp_size;
312
+
atomic_t sq_wr_avail;
313
+
struct srpt_port *sport;
314
+
u8 i_port_id[16];
315
+
u8 t_port_id[16];
316
+
int max_ti_iu_len;
317
+
atomic_t req_lim;
318
+
atomic_t req_lim_delta;
319
+
spinlock_t spinlock;
320
+
struct list_head free_list;
321
+
enum rdma_ch_state state;
322
+
struct srpt_send_ioctx **ioctx_ring;
323
+
struct ib_wc wc[16];
324
+
struct list_head list;
325
+
struct list_head cmd_wait_list;
326
+
struct se_session *sess;
327
+
u8 sess_name[36];
328
+
struct work_struct release_work;
329
+
struct completion *release_done;
330
+
};
331
+
332
+
/**
333
+
* struct srpt_port_attib - Attributes for SRPT port
334
+
* @srp_max_rdma_size: Maximum size of SRP RDMA transfers for new connections.
335
+
* @srp_max_rsp_size: Maximum size of SRP response messages in bytes.
336
+
* @srp_sq_size: Shared receive queue (SRQ) size.
337
+
*/
338
+
struct srpt_port_attrib {
339
+
u32 srp_max_rdma_size;
340
+
u32 srp_max_rsp_size;
341
+
u32 srp_sq_size;
342
+
};
343
+
344
+
/**
345
+
* struct srpt_port - Information associated by SRPT with a single IB port.
346
+
* @sdev: backpointer to the HCA information.
347
+
* @mad_agent: per-port management datagram processing information.
348
+
* @enabled: Whether or not this target port is enabled.
349
+
* @port_guid: ASCII representation of Port GUID
350
+
* @port: one-based port number.
351
+
* @sm_lid: cached value of the port's sm_lid.
352
+
* @lid: cached value of the port's lid.
353
+
* @gid: cached value of the port's gid.
354
+
* @port_acl_lock spinlock for port_acl_list:
355
+
* @work: work structure for refreshing the aforementioned cached values.
356
+
* @port_tpg_1 Target portal group = 1 data.
357
+
* @port_wwn: Target core WWN data.
358
+
* @port_acl_list: Head of the list with all node ACLs for this port.
359
+
*/
360
+
struct srpt_port {
361
+
struct srpt_device *sdev;
362
+
struct ib_mad_agent *mad_agent;
363
+
bool enabled;
364
+
u8 port_guid[64];
365
+
u8 port;
366
+
u16 sm_lid;
367
+
u16 lid;
368
+
union ib_gid gid;
369
+
spinlock_t port_acl_lock;
370
+
struct work_struct work;
371
+
struct se_portal_group port_tpg_1;
372
+
struct se_wwn port_wwn;
373
+
struct list_head port_acl_list;
374
+
struct srpt_port_attrib port_attrib;
375
+
};
376
+
377
+
/**
378
+
* struct srpt_device - Information associated by SRPT with a single HCA.
379
+
* @device: Backpointer to the struct ib_device managed by the IB core.
380
+
* @pd: IB protection domain.
381
+
* @mr: L_Key (local key) with write access to all local memory.
382
+
* @srq: Per-HCA SRQ (shared receive queue).
383
+
* @cm_id: Connection identifier.
384
+
* @dev_attr: Attributes of the InfiniBand device as obtained during the
385
+
* ib_client.add() callback.
386
+
* @srq_size: SRQ size.
387
+
* @ioctx_ring: Per-HCA SRQ.
388
+
* @rch_list: Per-device channel list -- see also srpt_rdma_ch.list.
389
+
* @ch_releaseQ: Enables waiting for removal from rch_list.
390
+
* @spinlock: Protects rch_list and tpg.
391
+
* @port: Information about the ports owned by this HCA.
392
+
* @event_handler: Per-HCA asynchronous IB event handler.
393
+
* @list: Node in srpt_dev_list.
394
+
*/
395
+
struct srpt_device {
396
+
struct ib_device *device;
397
+
struct ib_pd *pd;
398
+
struct ib_mr *mr;
399
+
struct ib_srq *srq;
400
+
struct ib_cm_id *cm_id;
401
+
struct ib_device_attr dev_attr;
402
+
int srq_size;
403
+
struct srpt_recv_ioctx **ioctx_ring;
404
+
struct list_head rch_list;
405
+
wait_queue_head_t ch_releaseQ;
406
+
spinlock_t spinlock;
407
+
struct srpt_port port[2];
408
+
struct ib_event_handler event_handler;
409
+
struct list_head list;
410
+
};
411
+
412
+
/**
413
+
* struct srpt_node_acl - Per-initiator ACL data (managed via configfs).
414
+
* @i_port_id: 128-bit SRP initiator port ID.
415
+
* @sport: port information.
416
+
* @nacl: Target core node ACL information.
417
+
* @list: Element of the per-HCA ACL list.
418
+
*/
419
+
struct srpt_node_acl {
420
+
u8 i_port_id[16];
421
+
struct srpt_port *sport;
422
+
struct se_node_acl nacl;
423
+
struct list_head list;
424
+
};
425
+
426
+
/*
427
+
* SRP-releated SCSI persistent reservation definitions.
428
+
*
429
+
* See also SPC4r28, section 7.6.1 (Protocol specific parameters introduction).
430
+
* See also SPC4r28, section 7.6.4.5 (TransportID for initiator ports using
431
+
* SCSI over an RDMA interface).
432
+
*/
433
+
434
+
enum {
435
+
SCSI_TRANSPORTID_PROTOCOLID_SRP = 4,
436
+
};
437
+
438
+
struct spc_rdma_transport_id {
439
+
uint8_t protocol_identifier;
440
+
uint8_t reserved[7];
441
+
uint8_t i_port_id[16];
442
+
};
443
+
444
+
#endif /* IB_SRPT_H */