xprtrdma: Disconnect on flushed completion

Completion errors after a disconnect often occur much sooner than a
CM_DISCONNECT event. Use this to try to detect connection loss more
quickly.

Note that other kernel ULPs do take care to disconnect explicitly
when a WR is flushed.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

include/trace/events/rpcrdma.h

@@ -109,7 +109,7 @@ DECLARE_EVENT_CLASS(xprtrdma_connect_class,
 		__assign_str(port, rpcrdma_portstr(r_xprt));
 	),
 
-	TP_printk("peer=[%s]:%s r_xprt=%p: rc=%d connect status=%d",
+	TP_printk("peer=[%s]:%s r_xprt=%p: rc=%d connection status=%d",
 		__get_str(addr), __get_str(port), __entry->r_xprt,
 		__entry->rc, __entry->connect_status
 	)
@@ -411,6 +411,7 @@ TRACE_EVENT(xprtrdma_inline_thresh,
 
 DEFINE_CONN_EVENT(connect);
 DEFINE_CONN_EVENT(disconnect);
+DEFINE_CONN_EVENT(flush_dct);
 
 DEFINE_RXPRT_EVENT(xprtrdma_create);
 DEFINE_RXPRT_EVENT(xprtrdma_op_destroy);

net/sunrpc/xprtrdma/frwr_ops.c

@@ -358,8 +358,8 @@ struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
 
 /**
  * frwr_wc_fastreg - Invoked by RDMA provider for a flushed FastReg WC
- * @cq:	completion queue (ignored)
- * @wc:	completed WR
+ * @cq: completion queue
+ * @wc: WCE for a completed FastReg WR
  *
  */
 static void frwr_wc_fastreg(struct ib_cq *cq, struct ib_wc *wc)
@@ -371,6 +371,8 @@ static void frwr_wc_fastreg(struct ib_cq *cq, struct ib_wc *wc)
 	/* WARNING: Only wr_cqe and status are reliable at this point */
 	trace_xprtrdma_wc_fastreg(wc, frwr);
 	/* The MR will get recycled when the associated req is retransmitted */
+
+	rpcrdma_flush_disconnect(cq, wc);
 }
 
 /**
@@ -441,8 +443,8 @@ static void __frwr_release_mr(struct ib_wc *wc, struct rpcrdma_mr *mr)
 
 /**
  * frwr_wc_localinv - Invoked by RDMA provider for a LOCAL_INV WC
- * @cq:	completion queue (ignored)
- * @wc:	completed WR
+ * @cq: completion queue
+ * @wc: WCE for a completed LocalInv WR
  *
  */
 static void frwr_wc_localinv(struct ib_cq *cq, struct ib_wc *wc)
@@ -455,12 +457,14 @@ static void frwr_wc_localinv(struct ib_cq *cq, struct ib_wc *wc)
 	/* WARNING: Only wr_cqe and status are reliable at this point */
 	trace_xprtrdma_wc_li(wc, frwr);
 	__frwr_release_mr(wc, mr);
+
+	rpcrdma_flush_disconnect(cq, wc);
 }
 
 /**
  * frwr_wc_localinv_wake - Invoked by RDMA provider for a LOCAL_INV WC
- * @cq:	completion queue (ignored)
- * @wc:	completed WR
+ * @cq: completion queue
+ * @wc: WCE for a completed LocalInv WR
  *
  * Awaken anyone waiting for an MR to finish being fenced.
  */
@@ -475,6 +479,8 @@ static void frwr_wc_localinv_wake(struct ib_cq *cq, struct ib_wc *wc)
 	trace_xprtrdma_wc_li_wake(wc, frwr);
 	__frwr_release_mr(wc, mr);
 	complete(&frwr->fr_linv_done);
+
+	rpcrdma_flush_disconnect(cq, wc);
 }
 
 /**
@@ -562,8 +568,8 @@ void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
 
 /**
  * frwr_wc_localinv_done - Invoked by RDMA provider for a signaled LOCAL_INV WC
- * @cq:	completion queue (ignored)
- * @wc:	completed WR
+ * @cq:	completion queue
+ * @wc:	WCE for a completed LocalInv WR
  *
  */
 static void frwr_wc_localinv_done(struct ib_cq *cq, struct ib_wc *wc)
@@ -581,6 +587,8 @@ static void frwr_wc_localinv_done(struct ib_cq *cq, struct ib_wc *wc)
 	/* Ensure @rep is generated before __frwr_release_mr */
 	smp_rmb();
 	rpcrdma_complete_rqst(rep);
+
+	rpcrdma_flush_disconnect(cq, wc);
 }
 
 /**

net/sunrpc/xprtrdma/verbs.c

@@ -128,14 +128,32 @@ rpcrdma_qp_event_handler(struct ib_event *event, void *context)
 	trace_xprtrdma_qp_event(r_xprt, event);
 }
 
+/**
+ * rpcrdma_flush_disconnect - Disconnect on flushed completion
+ * @cq: completion queue
+ * @wc: work completion entry
+ *
+ * Must be called in process context.
+ */
+void rpcrdma_flush_disconnect(struct ib_cq *cq, struct ib_wc *wc)
+{
+	struct rpcrdma_xprt *r_xprt = cq->cq_context;
+	struct rpc_xprt *xprt = &r_xprt->rx_xprt;
+
+	if (wc->status != IB_WC_SUCCESS && r_xprt->rx_ep.rep_connected == 1) {
+		r_xprt->rx_ep.rep_connected = -ECONNABORTED;
+		trace_xprtrdma_flush_dct(r_xprt, wc->status);
+		xprt_force_disconnect(xprt);
+	}
+}
+
 /**
  * rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC
  * @cq:	completion queue
- * @wc:	completed WR
+ * @wc:	WCE for a completed Send WR
  *
  */
-static void
-rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
+static void rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
 {
 	struct ib_cqe *cqe = wc->wr_cqe;
 	struct rpcrdma_sendctx *sc =
@@ -144,21 +162,21 @@ rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
 	/* WARNING: Only wr_cqe and status are reliable at this point */
 	trace_xprtrdma_wc_send(sc, wc);
 	rpcrdma_sendctx_put_locked((struct rpcrdma_xprt *)cq->cq_context, sc);
+	rpcrdma_flush_disconnect(cq, wc);
 }
 
 /**
  * rpcrdma_wc_receive - Invoked by RDMA provider for each polled Receive WC
- * @cq:	completion queue (ignored)
- * @wc:	completed WR
+ * @cq:	completion queue
+ * @wc:	WCE for a completed Receive WR
  *
  */
-static void
-rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
+static void rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
 {
 	struct ib_cqe *cqe = wc->wr_cqe;
 	struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep,
 					       rr_cqe);
-	struct rpcrdma_xprt *r_xprt = rep->rr_rxprt;
+	struct rpcrdma_xprt *r_xprt = cq->cq_context;
 
 	/* WARNING: Only wr_cqe and status are reliable at this point */
 	trace_xprtrdma_wc_receive(wc);
@@ -179,6 +197,7 @@ rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
 	return;
 
 out_flushed:
+	rpcrdma_flush_disconnect(cq, wc);
 	rpcrdma_rep_destroy(rep);
 }
 
@@ -395,7 +414,7 @@ static int rpcrdma_ep_create(struct rpcrdma_xprt *r_xprt)
 		goto out_destroy;
 	}
 
-	ep->rep_attr.recv_cq = ib_alloc_cq_any(id->device, NULL,
+	ep->rep_attr.recv_cq = ib_alloc_cq_any(id->device, r_xprt,
 					       ep->rep_attr.cap.max_recv_wr,
 					       IB_POLL_WORKQUEUE);
 	if (IS_ERR(ep->rep_attr.recv_cq)) {

net/sunrpc/xprtrdma/xprt_rdma.h

@@ -452,6 +452,7 @@ extern unsigned int xprt_rdma_memreg_strategy;
 /*
  * Endpoint calls - xprtrdma/verbs.c
  */
+void rpcrdma_flush_disconnect(struct ib_cq *cq, struct ib_wc *wc);
 int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt);
 void rpcrdma_xprt_disconnect(struct rpcrdma_xprt *r_xprt);