xprtrdma: Fix max_send_wr computation
For FRWR, the computation of max_send_wr is split between
frwr_op_open and rpcrdma_ep_create, which makes it difficult to tell
that the max_send_wr result is currently incorrect if frwr_op_open
has to reduce the credit limit to accommodate a small max_qp_wr.
This is a problem now that extra WRs are needed for backchannel
operations and a drain CQE.
So, refactor the computation so that it is all done in ->ro_open,
and fix the FRWR version of this computation so that it
accommodates HCAs with small max_qp_wr correctly.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 07529ef..62badde 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -501,8 +501,8 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
struct rpcrdma_create_data_internal *cdata)
{
struct rpcrdma_connect_private *pmsg = &ep->rep_cm_private;
- unsigned int max_qp_wr, max_sge;
struct ib_cq *sendcq, *recvcq;
+ unsigned int max_sge;
int rc;
max_sge = min_t(unsigned int, ia->ri_device->attrs.max_sge,
@@ -513,29 +513,13 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
}
ia->ri_max_send_sges = max_sge;
- if (ia->ri_device->attrs.max_qp_wr <= RPCRDMA_BACKWARD_WRS) {
- dprintk("RPC: %s: insufficient wqe's available\n",
- __func__);
- return -ENOMEM;
- }
- max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS - 1;
-
- /* check provider's send/recv wr limits */
- if (cdata->max_requests > max_qp_wr)
- cdata->max_requests = max_qp_wr;
+ rc = ia->ri_ops->ro_open(ia, ep, cdata);
+ if (rc)
+ return rc;
ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
ep->rep_attr.qp_context = ep;
ep->rep_attr.srq = NULL;
- ep->rep_attr.cap.max_send_wr = cdata->max_requests;
- ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
- ep->rep_attr.cap.max_send_wr += 1; /* drain cqe */
- rc = ia->ri_ops->ro_open(ia, ep, cdata);
- if (rc)
- return rc;
- ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
- ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
- ep->rep_attr.cap.max_recv_wr += 1; /* drain cqe */
ep->rep_attr.cap.max_send_sge = max_sge;
ep->rep_attr.cap.max_recv_sge = 1;
ep->rep_attr.cap.max_inline_data = 0;