xprtrdma: Increase maximum number of backchannel requests

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>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index b942c9d322a78d7d9420156b8aa3f01b964105eb..7621e2d0f107442d5574d8a910df9b7a9629cf74 100644 (file)
--- 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