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

From: Li Zhijian <lizhijian@cn.fujitsu.com>
To: <linux-rdma@vger.kernel.org>, <zyjzyj2000@gmail.com>,
	<jgg@ziepe.ca>, <aharonl@nvidia.com>, <leon@kernel.org>
Cc: <linux-kernel@vger.kernel.org>, <mbloch@nvidia.com>,
	<liweihang@huawei.com>, <liangwenpeng@huawei.com>,
	<yangx.jy@cn.fujitsu.com>, <rpearsonhpe@gmail.com>,
	<y-goto@fujitsu.com>, Li Zhijian <lizhijian@cn.fujitsu.com>
Subject: [RFC PATCH rdma-next 03/10] RDMA/rxe: Allow registering FLUSH flags for supported device only
Date: Tue, 28 Dec 2021 16:07:10 +0800	[thread overview]
Message-ID: <20211228080717.10666-4-lizhijian@cn.fujitsu.com> (raw)
In-Reply-To: <20211228080717.10666-1-lizhijian@cn.fujitsu.com>

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

Signed-off-by: Li Zhijian <lizhijian@cn.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



