[ewg] [PATCH] IB/IPoIB Check if grat. ARP changed had arrived when working in connected mode

[Moni Shoua]

    move a little up the code that checks for a situation where the remote GID stored in the ipoib_neigh is
    different than the one present in the neighbour (handle Gratuitous ARP) or that a bonding fail over has
    happened but the neighbour still has a pointer to an ipoib_neigh created not by the current slave. This
    will cause the driver to apply the check also for connected mode neighbours.
    This patch was tested against upstream kernel and ofed_kernel.
    
    Signed-off-by: Or Gerlitz <ogerlitz at voltaire.com>
    Signed-off-by: Moni Shoua <monis at voltaire.com>

diff --git a/kernel_patches/fixes/ipoib_0120_check_grat_arp_with_cm.patch b/kernel_patches/fixes/ipoib_0120_check_grat_arp_with_cm.patch
new file mode 100644
index 0000000..8b2c32e
--- /dev/null
+++ b/kernel_patches/fixes/ipoib_0120_check_grat_arp_with_cm.patch
@@ -0,0 +1,34 @@
+Index: ofa_kernel-1.3/drivers/infiniband/ulp/ipoib/ipoib_main.c
+===================================================================
+--- ofa_kernel-1.3.orig/drivers/infiniband/ulp/ipoib/ipoib_main.c	2008-01-29 08:55:33.000000000 -0500
++++ ofa_kernel-1.3/drivers/infiniband/ulp/ipoib/ipoib_main.c	2008-01-29 09:17:30.000000000 -0500
+@@ -716,12 +716,7 @@
+ 
+ 		neigh = *to_ipoib_neigh(skb->dst->neighbour);
+ 
+-		if (ipoib_cm_get(neigh)) {
+-			if (ipoib_cm_up(neigh)) {
+-				ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
+-				goto out;
+-			}
+-		} else if (neigh->ah) {
++		if (neigh->ah)
+ 			if (unlikely((memcmp(&neigh->dgid.raw,
+ 					    skb->dst->neighbour->ha + 4,
+ 					    sizeof(union ib_gid))) ||
+@@ -742,9 +737,14 @@
+ 				goto out;
+ 			}
+ 
++		if (ipoib_cm_get(neigh)) {
++			if (ipoib_cm_up(neigh)) {
++				ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
++				goto out;
++			}
++		} else if (neigh->ah) {
+ 			ipoib_send(dev, skb, neigh->ah,
+ 				   IPOIB_QPN(skb->dst->neighbour->ha));
+-
+ 			goto out;
+ 		}
+