Hi James/Tom,
MLX4 transport (connectX HCA) need 2 extra S/G entries per work request.
One is for the header and one for the checksum at the end. This patch
will fix rpc rdma transport to create qp with max_send_sge =
device_cap.max_sge - 2 if low-level device hca is connectX
thanks,
-vu
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c
b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index e132509..955cd75 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -827,7 +827,14 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt
*xprt)
qp_attr.qp_context = &newxprt->sc_xprt;
qp_attr.cap.max_send_wr = newxprt->sc_sq_depth;
qp_attr.cap.max_recv_wr = newxprt->sc_max_requests;
- qp_attr.cap.max_send_sge = newxprt->sc_max_sge;
+ /*
+ * MLX4 transport (connectX HCA) need 2 extra S/G entries
+ * one for the header and one for the checksum at the end
+ */
+ if (!strnicmp("mlx4", newxprt->sc_cm_id->device->name, 4))
+ qp_attr.cap.max_send_sge = newxprt->sc_max_sge - 2;
+ else
+ qp_attr.cap.max_send_sge = newxprt->sc_max_sge;
qp_attr.cap.max_recv_sge = newxprt->sc_max_sge;
qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
qp_attr.qp_type = IB_QPT_RC;
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