xprtrdma: Faster server reboot recovery (b2dde94b) · Commits · 戴 / test

In a cluster failover scenario, it is desirable for the client to attempt to reconnect quickly, as an alternate NFS server is already waiting to take over for the down server. The client can't see that a server IP address has moved to a new server until the existing connection is gone. For fabrics and devices where it is meaningful, set a definite upper bound on the amount of time before it is determined that a connection is no longer valid. This allows the RPC client to detect connection loss in a timely matter, then perform a fresh resolution of the server GUID in case it has changed (cluster failover). Signed-off-by:

Chuck Lever <chuck.lever@oracle.com> Tested-by:

Steve Wise <swise@opengridcomputing.com> Signed-off-by:

Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/xprtrdma/verbs.c

+11 −1

Original line number	Diff line number	Diff line
		@@ -554,6 +554,7 @@ rpcrdma_ep_create(struct rpcrdma_ep ep, struct rpcrdma_ia ia,
		ep->rep_attr.recv_cq = recvcq;

		/* Initialize cma parameters */
		memset(&ep->rep_remote_cma, 0, sizeof(ep->rep_remote_cma));

		/* RPC/RDMA does not use private data */
		ep->rep_remote_cma.private_data = NULL;
		@@ -567,7 +568,16 @@ rpcrdma_ep_create(struct rpcrdma_ep ep, struct rpcrdma_ia ia,
		ep->rep_remote_cma.responder_resources =
		ia->ri_device->attrs.max_qp_rd_atom;

		ep->rep_remote_cma.retry_count = 7;
		/* Limit transport retries so client can detect server
		* GID changes quickly. RPC layer handles re-establishing
		* transport connection and retransmission.
		*/
		ep->rep_remote_cma.retry_count = 6;

		/* RPC-over-RDMA handles its own flow control. In addition,
		* make all RNR NAKs visible so we know that RPC-over-RDMA
		* flow control is working correctly (no NAKs should be seen).
		*/
		ep->rep_remote_cma.flow_control = 0;
		ep->rep_remote_cma.rnr_retry_count = 0;

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