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02d1aa7af1
Add extensible query device capabilities verb to allow adding new features.
ib_uverbs_ex_query_device is added and copy_query_dev_fields is used to copy
capability fields to be used by both ib_uverbs_query_device and
ib_uverbs_ex_query_device.
Following the discussion about this patch [1], the code now validates
the command's comp_mask is zero, returning -EINVAL for unknown values,
in order to allow extending the verb in the future.
The verb also checks the user-space provided response buffer size and
only fills in capabilities that will fit in the buffer. In attempt to
follow the spirit of presentation [2] by Tzahi Oved that was presented
during OpenFabrics Alliance International Developer Workshop 2013, the
comp_mask bits will only describe which fields are valid. Furthermore,
fields that can simply be cleared when they are not supported, do not
require a comp_mask bit at all. The verb returns a response_length
field containing the actual number of bytes written by the kernel, so
that a newer version running on an older kernel can tell which fields
were actually returned.
[1] [PATCH v1 0/5] IB/core: extended query device caps cleanup for v3.19
http://thread.gmane.org/gmane.linux.kernel.api/7889/
[2] https://www.openfabrics.org/images/docs/2013_Dev_Workshop/Tues_0423/2013_Workshop_Tues_0830_Tzahi_Oved-verbs_extensions_ofa_2013-tzahio.pdf
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Reviewed-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
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| .. | ||
| addr.c | ||
| agent.c | ||
| agent.h | ||
| cache.c | ||
| cm.c | ||
| cm_msgs.h | ||
| cma.c | ||
| core_priv.h | ||
| device.c | ||
| fmr_pool.c | ||
| iwcm.c | ||
| iwcm.h | ||
| iwpm_msg.c | ||
| iwpm_util.c | ||
| iwpm_util.h | ||
| mad.c | ||
| mad_priv.h | ||
| mad_rmpp.c | ||
| mad_rmpp.h | ||
| Makefile | ||
| multicast.c | ||
| netlink.c | ||
| packer.c | ||
| sa.h | ||
| sa_query.c | ||
| smi.c | ||
| smi.h | ||
| sysfs.c | ||
| ucm.c | ||
| ucma.c | ||
| ud_header.c | ||
| umem.c | ||
| umem_odp.c | ||
| umem_rbtree.c | ||
| user_mad.c | ||
| uverbs.h | ||
| uverbs_cmd.c | ||
| uverbs_main.c | ||
| uverbs_marshall.c | ||
| verbs.c | ||