[openib-general] IPoIB still not working

[Roland Dreier]

OK, I think the following change (already committed) should fix IPoIB
with PCI Express HCAs.  Thanks to Josh England for giving me access to
a couple of his machines for debugging, and to Tziporet Koren for
pointing out this Arbel "feature."

 - Roland

Index: infiniband/hw/mthca/mthca_av.c
===================================================================
--- infiniband/hw/mthca/mthca_av.c	(revision 1331)
+++ infiniband/hw/mthca/mthca_av.c	(working copy)
@@ -97,6 +97,9 @@
 			cpu_to_be32((ah_attr->grh.traffic_class << 20) |
 				    ah_attr->grh.flow_label);
 		memcpy(av->dgid, ah_attr->grh.dgid.raw, 16);
+	} else {
+		/* Arbel workaround -- low byte of GID must be 2 */
+		av->dgid[3] = cpu_to_be32(2);
 	}
 
 	if (0) {