Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
RDMA: Add ib_is_udata_in_empty()
If the driver doesn't yet support any request driver data it should check
that it is all zeroed. This is a common pattern, add a helper around
_ib_copy_validate_udata_in() to do this.
Link: https://patch.msgid.link/r/6-v3-bd56dd443069+49-bnxt_re_uapi_jgg@nvidia.com
Tested-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Acked-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
+15
+15
include/rdma/uverbs_ioctl.h
+15
include/rdma/uverbs_ioctl.h
···
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})
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/**
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* ib_is_udata_in_empty - Check if the udata input buffer is all zeros
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* @udata: The system calls ib_udata struct
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*
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* This should be used if the driver does not currently define a driver data
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* struct. Returns 0 if the buffer is empty or all zeros, -EOPNOTSUPP if
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* non-zero data is present, or a negative error code on failure.
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*/
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static inline int ib_is_udata_in_empty(struct ib_udata *udata)
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{
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if (!udata || udata->inlen == 0)
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return 0;
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return _ib_copy_validate_udata_in(udata, NULL, 0, 0);
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}
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/**
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* ib_respond_udata - Copy a driver data response to userspace
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* @_udata: The system calls ib_udata struct
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* @_rep: Kernel buffer containing the response driver data on the stack