xprtrdma: Use core ib_drain_qp() API

Clean up: Replace rpcrdma_flush_cqs() and rpcrdma_clean_cqs() with
the new ib_drain_qp() API.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-By: Leon Romanovsky <leonro@mellanox.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 9f8d6c1..b7a5bc1 100644 (file)
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -203,15 +203,6 @@ out_fail:
        goto out_schedule;
 }
 
-static void
-rpcrdma_flush_cqs(struct rpcrdma_ep *ep)
-{
-       struct ib_wc wc;
-
-       while (ib_poll_cq(ep->rep_attr.recv_cq, 1, &wc) > 0)
-               rpcrdma_receive_wc(NULL, &wc);
-}
-
 static int
 rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
 {
@@ -374,23 +365,6 @@ out:
 }
 
 /*
- * Drain any cq, prior to teardown.
- */
-static void
-rpcrdma_clean_cq(struct ib_cq *cq)
-{
-       struct ib_wc wc;
-       int count = 0;
-
-       while (1 == ib_poll_cq(cq, 1, &wc))
-               ++count;
-
-       if (count)
-               dprintk("RPC:       %s: flushed %d events (last 0x%x)\n",
-                       __func__, count, wc.opcode);
-}
-
-/*
  * Exported functions.
  */
 
@@ -515,7 +489,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
                        __func__);
                return -ENOMEM;
        }
-       max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS;
+       max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS - 1;
 
        /* check provider's send/recv wr limits */
        if (cdata->max_requests > max_qp_wr)
@@ -526,11 +500,13 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
        ep->rep_attr.srq = NULL;
        ep->rep_attr.cap.max_send_wr = cdata->max_requests;
        ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
+       ep->rep_attr.cap.max_send_wr += 1;      /* drain cqe */
        rc = ia->ri_ops->ro_open(ia, ep, cdata);
        if (rc)
                return rc;
        ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
        ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
+       ep->rep_attr.cap.max_recv_wr += 1;      /* drain cqe */
        ep->rep_attr.cap.max_send_sge = RPCRDMA_MAX_IOVS;
        ep->rep_attr.cap.max_recv_sge = 1;
        ep->rep_attr.cap.max_inline_data = 0;
@@ -622,13 +598,8 @@ rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
 
        cancel_delayed_work_sync(&ep->rep_connect_worker);
 
-       if (ia->ri_id->qp)
-               rpcrdma_ep_disconnect(ep, ia);
-
-       rpcrdma_clean_cq(ep->rep_attr.recv_cq);
-       rpcrdma_clean_cq(ep->rep_attr.send_cq);
-
        if (ia->ri_id->qp) {
+               rpcrdma_ep_disconnect(ep, ia);
                rdma_destroy_qp(ia->ri_id);
                ia->ri_id->qp = NULL;
        }
@@ -659,7 +630,6 @@ retry:
                dprintk("RPC:       %s: reconnecting...\n", __func__);
 
                rpcrdma_ep_disconnect(ep, ia);
-               rpcrdma_flush_cqs(ep);
 
                xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
                id = rpcrdma_create_id(xprt, ia,
@@ -785,7 +755,6 @@ rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
 {
        int rc;
 
-       rpcrdma_flush_cqs(ep);
        rc = rdma_disconnect(ia->ri_id);
        if (!rc) {
                /* returns without wait if not connected */
@@ -797,6 +766,8 @@ rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
                dprintk("RPC:       %s: rdma_disconnect %i\n", __func__, rc);
                ep->rep_connected = rc;
        }
+
+       ib_drain_qp(ia->ri_id->qp);
 }
 
 struct rpcrdma_req *