Subject: [PATCH v1 11/19] xprtrdma: Increase maximum number of backchannel
 request
From:   Chuck Lever <chuck.lever@oracle.com>
To:     linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org
Date:   Wed, 10 Apr 2019 16:07:30 -0400
Message-ID: <20190410200730.11522.38203.stgit@manet.1015granger.net>
In-Reply-To: <20190410200446.11522.21145.stgit@manet.1015granger.net>
References: <20190410200446.11522.21145.stgit@manet.1015granger.net>
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Sender: linux-nfs-owner@vger.kernel.org
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Reflects the change introduced in commit 067c46967160 ("NFSv4.1:
Bump the default callback session slot count to 16").

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 net/sunrpc/xprtrdma/xprt_rdma.h |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 9871cd9..f1bbe36 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -103,12 +103,14 @@ struct rpcrdma_ep {
 
 /* Pre-allocate extra Work Requests for handling backward receives
  * and sends. This is a fixed value because the Work Queues are
- * allocated when the forward channel is set up.
+ * allocated when the forward channel is set up, long before the
+ * backchannel is provisioned. This value is two times
+ * NFS4_DEF_CB_SLOT_TABLE_SIZE.
  */
 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
-#define RPCRDMA_BACKWARD_WRS		(8)
+#define RPCRDMA_BACKWARD_WRS (32)
 #else
-#define RPCRDMA_BACKWARD_WRS		(0)
+#define RPCRDMA_BACKWARD_WRS (0)
 #endif
 
 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV