qperf: Add IBV_QP_CAP to ibv_query_qp call

Add IBV_QP_CAP to make sure the capabilities field is returned by the device.
According to the man page devices are allowed to abbreviate the data returned.
This ensures we get the capabilities at a minimum.

Reviewed-by: Dean Luick <[email protected]>
Signed-off-by: Somnath Kotur <[email protected]>
Signed-off-by: Ira Weiny <[email protected]>

Author: Dean Luick

src/rdma.c

@@ -1494,7 +1494,7 @@ rd_open(DEVICE *dev, int trans, int max_send_wr, int max_recv_wr)
         struct ibv_qp_attr qp_attr;
         struct ibv_qp_init_attr qp_init_attr;
 
-        if (ibv_query_qp(dev->qp, &qp_attr, 0, &qp_init_attr) != 0)
+        if (ibv_query_qp(dev->qp, &qp_attr, IBV_QP_CAP, &qp_init_attr) != 0)
             error(SYS, "query QP failed");
         dev->max_inline = qp_attr.cap.max_inline_data;
     }