[openib-general] IPoIB still not working

[England, Joshua J]

Roland,

Thanks for taking the time to debug this issue.  I'll definitely pound on the stuff and let you know if anything breaks.

-JE

-----Original Message-----
From: openib-general-bounces at openib.org on behalf of Roland Dreier
Sent: Wed 12/15/2004 8:51 AM
To: Woodruff, Robert J
Cc: openib-general at openib.org
Subject: Re: [openib-general] IPoIB still not working
 
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) {
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