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svcrdma: Enqueue after setting XPT_CLOSE in completion handlers 

I noticed the server was sometimes not closing the connection after
a flushed Send. For example, if the client responds with an RNR NAK
to a Reply from the server, that client might be deadlocked, and
thus wouldn't send any more traffic. Thus the server wouldn't have
any opportunity to notice the XPT_CLOSE bit has been set.

Enqueue the transport so that svcxprt notices the bit even if there
is no more transport activity after a flushed completion, QP access
error, or device removal event.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-By: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2017-10-27 10:49:51 -04:00 committed by J. Bruce Fields
parent 7e981a8afa
commit 77a08867a6
1 changed files with 8 additions and 3 deletions
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11
net/sunrpc/xprtrdma/svc_rdma_transport.c
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@ -290,6 +290,7 @@ static void qp_event_handler(struct ib_event *event, void *context)
ib_event_msg(event->event), event->event,
event->element.qp);
set_bit(XPT_CLOSE, &xprt->xpt_flags);
svc_xprt_enqueue(xprt);
break;
}
}
@ -322,8 +323,7 @@ static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
if (test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags))
goto out;
svc_xprt_enqueue(&xprt->sc_xprt);
goto out;
goto out_enqueue;
flushed:
if (wc->status != IB_WC_WR_FLUSH_ERR)
@ -333,6 +333,8 @@ flushed:
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
svc_rdma_put_context(ctxt, 1);
out_enqueue:
svc_xprt_enqueue(&xprt->sc_xprt);
out:
svc_xprt_put(&xprt->sc_xprt);
}
@ -358,6 +360,7 @@ void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
if (unlikely(wc->status != IB_WC_SUCCESS)) {
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
svc_xprt_enqueue(&xprt->sc_xprt);
if (wc->status != IB_WC_WR_FLUSH_ERR)
pr_err("svcrdma: Send: %s (%u/0x%x)\n",
ib_wc_status_msg(wc->status),
@ -569,8 +572,10 @@ static int rdma_listen_handler(struct rdma_cm_id *cma_id,
case RDMA_CM_EVENT_DEVICE_REMOVAL:
dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n",
xprt, cma_id);
if (xprt)
if (xprt) {
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
svc_xprt_enqueue(&xprt->sc_xprt);
}
break;
default: