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xprtrdma: Disconnect on flushed completion

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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>
This commit is contained in:
Chuck Lever 2020-02-21 17:00:49 -05:00 committed by Anna Schumaker
parent 897b7be9bc
commit d6ccebf956
4 changed files with 47 additions and 18 deletions
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3
include/trace/events/rpcrdma.h
View File

@ -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);

24
net/sunrpc/xprtrdma/frwr_ops.c
View File

@ -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);
}
/**

37
net/sunrpc/xprtrdma/verbs.c
View File

@ -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)) {

1
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -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);