[PATCH for-rc] RDMA/core: Fix corrupted SL on passive side

["Håkon Bugge" <haakon.bugge@oracle.com>]

On RoCE systems, a CM REQ contains a Primary Hop Limit > 1 and Primary
Subnet Local is zero.

In cm_req_handler(), the cm_process_routed_req() function is
called. Since the Primary Subnet Local value is zero in the request,
and since this is RoCE (Primary Local LID is permissive), the
following statement will be executed:

      IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl);

This corrupts SL in req_msg if it was different from zero. In other
words, a request to setup a connection using an SL != zero, will not
be honored, and a connection using SL zero will be created instead.

Fixed by not calling cm_process_routed_req() on RoCE systems.

Fixes: 3971c9f6dbf2 ("IB/cm: Add interim support for routed paths")
Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
---
 drivers/infiniband/core/cm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 3d194bb..6adbaea 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -2138,7 +2138,8 @@ static int cm_req_handler(struct cm_work *work)
 		goto destroy;
 	}
 
-	cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
+	if (cm_id_priv->av.ah_attr.type != RDMA_AH_ATTR_TYPE_ROCE)
+		cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
 
 	memset(&work->path[0], 0, sizeof(work->path[0]));
 	if (cm_req_has_alt_path(req_msg))
-- 
1.8.3.1