[PATCH 3.2 54/62] IB/core: Use GRH when the path hop-limit > 0

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.kernel
Subject	[PATCH 3.2 54/62] IB/core: Use GRH when the path hop-limit > 0
Date	2016-03-29 22:20 +0200
Message-ID	<ri8hk-2Tk-29@gated-at.bofh.it> (permalink)
References	<ri87D-2Ps-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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3.2.79-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Or Gerlitz <ogerlitz@mellanox.com>

commit 11d8d645343efba0c975aefe7c2cf3b33c836c75 upstream.

According to IBTA spec v1.3 section 12.7.19, QPs should use GRH when
the path returned by the SA has hop-limit > 0. Currently, we do that
only for the > 1 case, fix that.

Fixes: 6d969a471ba1 ('IB/sa: Add ib_init_ah_from_path()')
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/infiniband/core/sa_query.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -508,7 +508,7 @@ int ib_init_ah_from_path(struct ib_devic
 
 	force_grh = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_ETHERNET;
 
-	if (rec->hop_limit > 1 || force_grh) {
+	if (rec->hop_limit > 0 || force_grh) {
 		ah_attr->ah_flags = IB_AH_GRH;
 		ah_attr->grh.dgid = rec->dgid;

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[PATCH 3.2 54/62] IB/core: Use GRH when the path hop-limit > 0 Ben Hutchings <ben@decadent.org.uk> - 2016-03-29 22:20 +0200

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