netdev - [PATCH rdma-next 08/10] RDMA/uverbs: Add new relaxed ordering memory region access flag

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Message-Id: <1578506740-22188-9-git-send-email-yishaih@mellanox.com>
Date:   Wed,  8 Jan 2020 20:05:38 +0200
From:   Yishai Hadas <yishaih@...lanox.com>
To:     linux-rdma@...r.kernel.org, jgg@...lanox.com, dledford@...hat.com
Cc:     saeedm@...lanox.com, yishaih@...lanox.com, maorg@...lanox.com,
        michaelgur@...lanox.com, netdev@...r.kernel.org
Subject: [PATCH rdma-next 08/10] RDMA/uverbs: Add new relaxed ordering memory region access flag

From: Michael Guralnik <michaelgur@...lanox.com>

Adding 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.

Signed-off-by: Michael Guralnik <michaelgur@...lanox.com>
Signed-off-by: Yishai Hadas <yishaih@...lanox.com>
---
 include/rdma/ib_verbs.h                 | 1 +
 include/uapi/rdma/ib_user_ioctl_verbs.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index ffb358f..2b3c16f 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1418,6 +1418,7 @@ enum ib_access_flags {
 	IB_ZERO_BASED = IB_UVERBS_ACCESS_ZERO_BASED,
 	IB_ACCESS_ON_DEMAND = IB_UVERBS_ACCESS_ON_DEMAND,
 	IB_ACCESS_HUGETLB = IB_UVERBS_ACCESS_HUGETLB,
+	IB_ACCESS_RELAXED_ORDERING = IB_UVERBS_ACCESS_RELAXED_ORDERING,
 
 	IB_ACCESS_OPTIONAL = IB_UVERBS_ACCESS_OPTIONAL_RANGE,
 	IB_ACCESS_SUPPORTED =
diff --git a/include/uapi/rdma/ib_user_ioctl_verbs.h b/include/uapi/rdma/ib_user_ioctl_verbs.h
index 76dbbd9..2a165f4 100644
--- a/include/uapi/rdma/ib_user_ioctl_verbs.h
+++ b/include/uapi/rdma/ib_user_ioctl_verbs.h
@@ -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)
-- 
1.8.3.1