RDMA/counter: Check CAP_NET_RAW check in user namespace for RDMA counters

Currently, the capability check is done in the default
init_user_ns user namespace. When a process runs in a
non default user namespace, such check fails.

Since the RDMA device is a resource within a network namespace,
use the network namespace associated with the RDMA device to
determine its owning user namespace.

Fixes: 1bd8e0a9d0fd ("RDMA/counter: Allow manual mode configuration support")
Signed-off-by: Parav Pandit <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Leon Romanovsky <[e-mail]>

drivers/infiniband/core/counters.c

···
 		return NULL;
 
 	qp = container_of(res, struct ib_qp, res);
-	if (qp->qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
+	if (qp->qp_type == IB_QPT_RAW_PACKET && !rdma_dev_has_raw_cap(dev))
 		goto err;
 
 	return qp;