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authorChuck Lever <chuck.lever@oracle.com>2017-08-28 22:06:06 +0300
committerJ. Bruce Fields <bfields@redhat.com>2017-09-05 22:15:30 +0300
commit5a25bfd28c321e522dbe8083ad6219fa2a820610 (patch)
tree5f6ea54a6eb62c4417536cbcfde6ff241e928399 /net
parent193bcb7b3719a315814dce40fc8dcd1af786ea64 (diff)
downloadlinux-5a25bfd28c321e522dbe8083ad6219fa2a820610.tar.xz
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')
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_transport.c19
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);