svcrdma: remove rdma_create_qp() failure recovery logic

In svc_rdma_accept(), if rdma_create_qp() fails, there is useless
logic to try and call rdma_create_qp() again with reduced sge depths.
The assumption, I guess, was that perhaps the initial sge depths
chosen were too big.  However they initial depths are selected based
on the rdma device attribute max_sge returned from ib_query_device().
If rdma_create_qp() fails, it would not be because the max_send_sge and
max_recv_sge values passed in exceed the device's max.  So just remove
this code.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

net/sunrpc/xprtrdma/svc_rdma_transport.c

@@ -943,23 +943,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 
 	ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr);
 	if (ret) {
-		/*
-		 * XXX: This is a hack. We need a xx_request_qp interface
-		 * that will adjust the qp_attr's with a best-effort
-		 * number
-		 */
-		qp_attr.cap.max_send_sge -= 2;
-		qp_attr.cap.max_recv_sge -= 2;
-		ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd,
-				     &qp_attr);
-		if (ret) {
-			dprintk("svcrdma: failed to create QP, ret=%d\n", ret);
-			goto errout;
-		}
-		newxprt->sc_max_sge = qp_attr.cap.max_send_sge;
-		newxprt->sc_max_sge = qp_attr.cap.max_recv_sge;
-		newxprt->sc_sq_depth = qp_attr.cap.max_send_wr;
-		newxprt->sc_max_requests = qp_attr.cap.max_recv_wr;
+		dprintk("svcrdma: failed to create QP, ret=%d\n", ret);
+		goto errout;
 	}
 	newxprt->sc_qp = newxprt->sc_cm_id->qp;