diff options
| author | Chuck Lever <chuck.lever@oracle.com> | 2017-08-28 15:06:06 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2017-09-05 15:15:30 -0400 |
| commit | 5a25bfd28c321e522dbe8083ad6219fa2a820610 (patch) | |
| tree | 5f6ea54a6eb62c4417536cbcfde6ff241e928399 /net/sunrpc/xprtrdma | |
| parent | 193bcb7b3719a315814dce40fc8dcd1af786ea64 (diff) | |
svcrdma: Limit RQ depth
Ensure that the chosen Receive Queue depth for a newly created
transport does not overrun the QP WR limit of the underlying device.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc/xprtrdma')
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_transport.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index 2aa8473dcc97..cdb04f8a0c25 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -167,8 +167,8 @@ static bool svc_rdma_prealloc_ctxts(struct svcxprt_rdma *xprt) { unsigned int i; - /* Each RPC/RDMA credit can consume a number of send - * and receive WQEs. One ctxt is allocated for each. + /* Each RPC/RDMA credit can consume one Receive and + * one Send WQE at the same time. */ i = xprt->sc_sq_depth + xprt->sc_rq_depth; @@ -742,13 +742,18 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) newxprt->sc_max_sge = min((size_t)dev->attrs.max_sge, (size_t)RPCSVC_MAXPAGES); newxprt->sc_max_req_size = svcrdma_max_req_size; - newxprt->sc_max_requests = min_t(u32, dev->attrs.max_qp_wr, - svcrdma_max_requests); - newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests); - newxprt->sc_max_bc_requests = min_t(u32, dev->attrs.max_qp_wr, - svcrdma_max_bc_requests); + newxprt->sc_max_requests = svcrdma_max_requests; + newxprt->sc_max_bc_requests = svcrdma_max_bc_requests; newxprt->sc_rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests; + if (newxprt->sc_rq_depth > dev->attrs.max_qp_wr) { + pr_warn("svcrdma: reducing receive depth to %d\n", + dev->attrs.max_qp_wr); + newxprt->sc_rq_depth = dev->attrs.max_qp_wr; + newxprt->sc_max_requests = newxprt->sc_rq_depth - 2; + newxprt->sc_max_bc_requests = 2; + } + newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests); newxprt->sc_sq_depth = newxprt->sc_rq_depth; atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth); |