devlink: Introduce switchdev_inactive eswitch mode

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

Adds DEVLINK_ESWITCH_MODE_SWITCHDEV_INACTIVE attribute to UAPI and
documentation.

Before having traffic flow through an eswitch, a user may want to have the
ability to block traffic towards the FDB until FDB is fully programmed and
the user is ready to send traffic to it. For example: when two eswitches
are present for vports in a multi-PF setup, one eswitch may take over the
traffic from the other when the user chooses.
Before this take over, a user may want to first program the inactive
eswitch and then once ready redirect traffic to this new eswitch.

switchdev modes transition semantics:

legacy->switchdev_inactive: Create switchdev mode normally, traffic not
allowed to flow yet.

switchdev_inactive->switchdev: Enable traffic to flow.

switchdev->switchdev_inactive: Block traffic on the FDB, FDB and
representros state and content is preserved.

When eswitch is configured to this mode, traffic is ignored/dropped on
this eswitch FDB, while current configuration is kept, e.g FDB rules and
netdev representros are kept available, FDB programming is allowed.

Example:
# start inactive switchdev
devlink dev eswitch set pci/0000:08:00.1 mode switchdev_inactive
# setup TC rules, representors etc ..
# activate
devlink dev eswitch set pci/0000:08:00.1 mode switchdev

Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://patch.msgid.link/20251108070404.1551708-2-saeed@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

authored by

Saeed Mahameed and committed by

Paolo Abeni 7 months ago 0e535824 8180c4fa

+17 -1

4 changed files

expand all

Documentation

netlink

specs

devlink.yaml

networking

devlink

devlink-eswitch-attr.rst

include

uapi

linux

devlink.h

net

devlink

netlink_gen.c

Documentation/netlink/specs/devlink.yaml

··· 99 99 name: legacy 100 100 - 101 101 name: switchdev 102 + - 103 + name: switchdev-inactive 102 104 - 103 105 type: enum 104 106 name: eswitch-inline-mode

+13

Documentation/networking/devlink/devlink-eswitch-attr.rst

··· 39 39 rules. 40 40 * ``switchdev`` allows for more advanced offloading capabilities of 41 41 the E-Switch to hardware. 42 + * ``switchdev_inactive`` switchdev mode but starts inactive, doesn't allow traffic 43 + until explicitly activated. This mode is useful for orchestrators that 44 + want to prepare the device in switchdev mode but only activate it when 45 + all configurations are done. 42 46 * - ``inline-mode`` 43 47 - enum 44 48 - Some HWs need the VF driver to put part of the packet ··· 78 74 79 75 # enable encap-mode with legacy mode 80 76 $ devlink dev eswitch set pci/0000:08:00.0 mode legacy inline-mode none encap-mode basic 77 + 78 + # start switchdev mode in inactive state 79 + $ devlink dev eswitch set pci/0000:08:00.0 mode switchdev_inactive 80 + 81 + # setup switchdev configurations, representors, FDB entries, etc.. 82 + ... 83 + 84 + # activate switchdev mode to allow traffic 85 + $ devlink dev eswitch set pci/0000:08:00.0 mode switchdev

include/uapi/linux/devlink.h

··· 181 181 enum devlink_eswitch_mode { 182 182 DEVLINK_ESWITCH_MODE_LEGACY, 183 183 DEVLINK_ESWITCH_MODE_SWITCHDEV, 184 + DEVLINK_ESWITCH_MODE_SWITCHDEV_INACTIVE, 184 185 }; 185 186 186 187 enum devlink_eswitch_inline_mode {

+1 -1

net/devlink/netlink_gen.c

··· 229 229 static const struct nla_policy devlink_eswitch_set_nl_policy[DEVLINK_ATTR_ESWITCH_ENCAP_MODE + 1] = { 230 230 [DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, }, 231 231 [DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, }, 232 - [DEVLINK_ATTR_ESWITCH_MODE] = NLA_POLICY_MAX(NLA_U16, 1), 232 + [DEVLINK_ATTR_ESWITCH_MODE] = NLA_POLICY_MAX(NLA_U16, 2), 233 233 [DEVLINK_ATTR_ESWITCH_INLINE_MODE] = NLA_POLICY_MAX(NLA_U8, 3), 234 234 [DEVLINK_ATTR_ESWITCH_ENCAP_MODE] = NLA_POLICY_MAX(NLA_U8, 1), 235 235 };

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