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RDMA/uverbs: Add new relaxed ordering memory region access flag

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Add a new relaxed ordering access flag for memory regions.  Using memory
regions with relaxed ordeing set can enhance performance.

This access flag is handled in a best-effort manner, drivers should ignore
if they don't support setting relaxed ordering.

Link: https://lore.kernel.org/r/1578506740-22188-9-git-send-email-yishaih@mellanox.com
Signed-off-by: Michael Guralnik <michaelgur@mellanox.com>
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Michael Guralnik
2020-01-08 20:05:38 +02:00
committed by Jason Gunthorpe
parent 86dd738cf2
commit 2233c6609c
2 changed files with 2 additions and 0 deletions
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include/uapi/rdma/ib_user_ioctl_verbs.h
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@@ -54,6 +54,7 @@ enum ib_uverbs_access_flags {
IB_UVERBS_ACCESS_ON_DEMAND = 1 << 6,
IB_UVERBS_ACCESS_HUGETLB = 1 << 7,
IB_UVERBS_ACCESS_RELAXED_ORDERING = IB_UVERBS_ACCESS_OPTIONAL_FIRST,
IB_UVERBS_ACCESS_OPTIONAL_RANGE =
((IB_UVERBS_ACCESS_OPTIONAL_LAST << 1) - 1) &
~(IB_UVERBS_ACCESS_OPTIONAL_FIRST - 1)