IB/core: Use hop-limit from IP stack for RoCE

Previously, IPV6_DEFAULT_HOPLIMIT was used as the hop limit value for
RoCE. Fixing that by taking ip4_dst_hoplimit and ip6_dst_hoplimit as
hop limit values.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 0ba0463..1d92e09 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -1641,6 +1641,7 @@
 	cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
 
 	memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN);
+	work->path[0].hop_limit = cm_id_priv->av.ah_attr.grh.hop_limit;
 	ret = ib_get_cached_gid(work->port->cm_dev->ib_device,
 				work->port->port_num,
 				cm_id_priv->av.ah_attr.grh.sgid_index,