linux-kernel - [RFC PATCH rdma-next 03/10] RDMA/rxe: Allow registering FLUSH flags for supported device only

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Date:   Tue, 28 Dec 2021 16:07:10 +0800
From:   Li Zhijian <lizhijian@...fujitsu.com>
To:     <linux-rdma@...r.kernel.org>, <zyjzyj2000@...il.com>,
        <jgg@...pe.ca>, <aharonl@...dia.com>, <leon@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <mbloch@...dia.com>,
        <liweihang@...wei.com>, <liangwenpeng@...wei.com>,
        <yangx.jy@...fujitsu.com>, <rpearsonhpe@...il.com>,
        <y-goto@...itsu.com>, Li Zhijian <lizhijian@...fujitsu.com>
Subject: [RFC PATCH rdma-next 03/10] RDMA/rxe: Allow registering FLUSH flags for supported device only

Device should enable IB_DEVICE_RDMA_FLUSH capability if it want to
support RDMA FLUSH.

Signed-off-by: Li Zhijian <lizhijian@...fujitsu.com>
---
 include/rdma/ib_verbs.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index f04d66539879..51d58b641201 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -291,6 +291,7 @@ enum ib_device_cap_flags {
 	/* The device supports padding incoming writes to cacheline. */
 	IB_DEVICE_PCI_WRITE_END_PADDING		= (1ULL << 36),
 	IB_DEVICE_ALLOW_USER_UNREG		= (1ULL << 37),
+	IB_DEVICE_RDMA_FLUSH			= (1ULL << 38),
 };
 
 enum ib_atomic_cap {
@@ -4319,6 +4320,10 @@ static inline int ib_check_mr_access(struct ib_device *ib_dev,
 	if (flags & IB_ACCESS_ON_DEMAND &&
 	    !(ib_dev->attrs.device_cap_flags & IB_DEVICE_ON_DEMAND_PAGING))
 		return -EINVAL;
+
+	if (flags & IB_ACCESS_FLUSH &&
+	    !(ib_dev->attrs.device_cap_flags & IB_DEVICE_RDMA_FLUSH))
+		return -EINVAL;
 	return 0;
 }
 
-- 
2.31.1