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svcrdma: Add tracepoints to report ->xpo_accept failures 

Failure to accept a connection is typically due to a problem
specific to a transport type. Also, ->xpo_accept returns NULL
on error rather than reporting a specific problem.

So, add failure-specific tracepoints in svc_rdma_accept().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-04-30 15:25:01 -04:00
parent decc13f7eb
commit e979a173a0
2 changed files with 48 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
include/trace/events/rpcrdma.h
View File

@ -1309,9 +1309,45 @@ DECLARE_EVENT_CLASS(svcrdma_xprt_event,
TP_ARGS(xprt))
DEFINE_XPRT_EVENT(accept);
DEFINE_XPRT_EVENT(fail);
DEFINE_XPRT_EVENT(free);
DECLARE_EVENT_CLASS(svcrdma_accept_class,
TP_PROTO(
const struct svcxprt_rdma *rdma,
long status
),
TP_ARGS(rdma, status),
TP_STRUCT__entry(
__field(long, status)
__string(addr, rdma->sc_xprt.xpt_remotebuf)
),
TP_fast_assign(
__entry->status = status;
__assign_str(addr, rdma->sc_xprt.xpt_remotebuf);
),
TP_printk("addr=%s status=%ld",
__get_str(addr), __entry->status
)
);
#define DEFINE_ACCEPT_EVENT(name) \
DEFINE_EVENT(svcrdma_accept_class, svcrdma_##name##_err, \
TP_PROTO( \
const struct svcxprt_rdma *rdma, \
long status \
), \
TP_ARGS(rdma, status))
DEFINE_ACCEPT_EVENT(pd);
DEFINE_ACCEPT_EVENT(qp);
DEFINE_ACCEPT_EVENT(fabric);
DEFINE_ACCEPT_EVENT(initdepth);
DEFINE_ACCEPT_EVENT(accept);
TRACE_DEFINE_ENUM(RDMA_MSG);
TRACE_DEFINE_ENUM(RDMA_NOMSG);
TRACE_DEFINE_ENUM(RDMA_MSGP);

27
net/sunrpc/xprtrdma/svc_rdma_transport.c
View File

@ -410,9 +410,6 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
if (!newxprt)
return NULL;
dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n",
newxprt, newxprt->sc_cm_id);
dev = newxprt->sc_cm_id->device;
newxprt->sc_port_num = newxprt->sc_cm_id->port_num;
@ -448,21 +445,17 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
newxprt->sc_pd = ib_alloc_pd(dev, 0);
if (IS_ERR(newxprt->sc_pd)) {
dprintk("svcrdma: error creating PD for connect request\n");
trace_svcrdma_pd_err(newxprt, PTR_ERR(newxprt->sc_pd));
goto errout;
}
newxprt->sc_sq_cq = ib_alloc_cq_any(dev, newxprt, newxprt->sc_sq_depth,
IB_POLL_WORKQUEUE);
if (IS_ERR(newxprt->sc_sq_cq)) {
dprintk("svcrdma: error creating SQ CQ for connect request\n");
if (IS_ERR(newxprt->sc_sq_cq))
goto errout;
}
newxprt->sc_rq_cq =
ib_alloc_cq_any(dev, newxprt, rq_depth, IB_POLL_WORKQUEUE);
if (IS_ERR(newxprt->sc_rq_cq)) {
dprintk("svcrdma: error creating RQ CQ for connect request\n");
if (IS_ERR(newxprt->sc_rq_cq))
goto errout;
}
memset(&qp_attr, 0, sizeof qp_attr);
qp_attr.event_handler = qp_event_handler;
@ -486,7 +479,7 @@ 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) {
dprintk("svcrdma: failed to create QP, ret=%d\n", ret);
trace_svcrdma_qp_err(newxprt, ret);
goto errout;
}
newxprt->sc_qp = newxprt->sc_cm_id->qp;
@ -494,8 +487,10 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
if (!(dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
newxprt->sc_snd_w_inv = false;
if (!rdma_protocol_iwarp(dev, newxprt->sc_port_num) &&
!rdma_ib_or_roce(dev, newxprt->sc_port_num))
!rdma_ib_or_roce(dev, newxprt->sc_port_num)) {
trace_svcrdma_fabric_err(newxprt, -EINVAL);
goto errout;
}
if (!svc_rdma_post_recvs(newxprt))
goto errout;
@ -517,15 +512,17 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
conn_param.initiator_depth = min_t(int, newxprt->sc_ord,
dev->attrs.max_qp_init_rd_atom);
if (!conn_param.initiator_depth) {
dprintk("svcrdma: invalid ORD setting\n");
ret = -EINVAL;
trace_svcrdma_initdepth_err(newxprt, ret);
goto errout;
}
conn_param.private_data = &pmsg;
conn_param.private_data_len = sizeof(pmsg);
ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
if (ret)
if (ret) {
trace_svcrdma_accept_err(newxprt, ret);
goto errout;
}
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
dprintk("svcrdma: new connection %p accepted:\n", newxprt);
@ -544,8 +541,6 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
return &newxprt->sc_xprt;
errout:
dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret);
trace_svcrdma_xprt_fail(&newxprt->sc_xprt);
/* Take a reference in case the DTO handler runs */
svc_xprt_get(&newxprt->sc_xprt);
if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))