IB/core: Fix query port failure in RoCE

Currently ib_query_port always attempts to to read the subnet prefix by
calling ib_query_gid(). For RoCE/iWARP there is no subnet manager and no
subnet prefix. Fix this by querying GID[0] only for IB networks.

Fixes: fad61ad4e755 ('IB/core: Add subnet prefix to port info')
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 8b8a8d9cf13448049de37914305a78d2d451e0d6..5c155fa91eec8380a463ad687a6aa977c10bcefd 100644 (file)
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -661,6 +661,9 @@ int ib_query_port(struct ib_device *device,
        if (err || port_attr->subnet_prefix)
                return err;
 
+       if (rdma_port_get_link_layer(device, port_num) != IB_LINK_LAYER_INFINIBAND)
+               return 0;
+
        err = ib_query_gid(device, port_num, 0, &gid, NULL);
        if (err)
                return err;