[ofa-general] [PATCH] libibnetdisc: add retract_dpath function

[Ira Weiny]

From: Ira Weiny <wei...@llnl.gov>
Date: Wed, 26 Aug 2009 09:25:00 -0700
Subject: [PATCH] libibnetdisc: add retract_dpath function

        When using combined routing some switches do not handle Hop Count of 0
        well.  Detect when the drpath count is 0 and return to lid based
        routing in this case.

Signed-off-by: Ira Weiny <wei...@llnl.gov>
---
 infiniband-diags/libibnetdisc/src/ibnetdisc.c |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/infiniband-diags/libibnetdisc/src/ibnetdisc.c 
b/infiniband-diags/libibnetdisc/src/ibnetdisc.c
index c69467e..da8572c 100644
--- a/infiniband-diags/libibnetdisc/src/ibnetdisc.c
+++ b/infiniband-diags/libibnetdisc/src/ibnetdisc.c
@@ -175,6 +175,16 @@ static int add_port_to_dpath(ib_dr_path_t * path, int 
nextport)
        return path->cnt;
 }
 
+static int retract_dpath(ib_portid_t * path)
+{
+       path->drpath.cnt--;     /* restore path */
+       if (path->drpath.cnt == 0 && path->lid) {
+               /* return to lid based routing on this path */
+               path->drpath.drslid = 0;
+               path->drpath.drdlid = 0;
+       }
+}
+
 static int extend_dpath(struct ibmad_port *ibmad_port, ibnd_fabric_t * fabric,
                        ib_portid_t * portid, int nextport)
 {
@@ -502,7 +512,7 @@ static int get_remote_node(struct ibmad_port *ibmad_port,
        if (query_node(ibmad_port, fabric, &node_buf, &port_buf, path)) {
                IBND_ERROR("Query remote node (%s) failed, skipping port\n",
                           portid2str(path));
-               path->drpath.cnt--;     /* restore path */
+               retract_dpath(path);
                return 1;       /* positive == non-fatal error */
        }
 
@@ -530,7 +540,7 @@ static int get_remote_node(struct ibmad_port *ibmad_port,
        link_ports(node, port, remotenode, remoteport);
 
 error:
-       path->drpath.cnt--;     /* restore path */
+       retract_dpath(path);
        return (rc);
 }
 
-- 
1.5.4.5

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