netdev - [PATCH]: bonding: Fix 802.3ad no carrier on "no partner found" instance

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Date:	Fri, 1 Jun 2007 09:33:42 -0700
From:	"Laurent Chavey" <chavey@...gle.com>
To:	netdev@...r.kernel.org
Subject: [PATCH]: bonding: Fix 802.3ad no carrier on "no partner found" instance

%diff -ru linux-2.6.21.3/drivers/net/bonding/bond_3ad.c
linux-2.6.21.3.new/drivers/net/bonding/bond_3ad.c
--- linux-2.6.21.3/drivers/net/bonding/bond_3ad.c       2007-05-24
14:22:47.000000000 -0700
+++ linux-2.6.21.3.new/drivers/net/bonding/bond_3ad.c   2007-06-01
09:28:07.000000000 -0700
@@ -2312,10 +2312,7 @@
  */
 int bond_3ad_set_carrier(struct bonding *bond)
 {
-       struct aggregator *agg;
-
-       agg = __get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator));
-       if (agg && MAC_ADDRESS_COMPARE(&agg->partner_system, &null_mac_addr)) {
+       if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
                if (!netif_carrier_ok(bond->dev)) {
                        netif_carrier_on(bond->dev);
                        return 1;


On 5/31/07, Laurent Chavey <chavey@...gle.com> wrote:
> if a host configured with 802.3ad bond mode is connected to a switch
> that does not support 802.3ad,  then an aggregator is selected as the
> active aggregator (first link that has carrier in the slave list).
> This is perfectly fine, since it lets at least one of the link become active.
> (this was the behavior prior to 2.6.18)
>
> In 2.6.18 and above, a new check for the partner mac address was added
> before an aggregator's carrier is set on. If a host is  configured as
> previously
> described,  then no links will become active.
>
> is that the intended behavior ?
>
>
> -----
> in the scenario described here, the partner mac address is always set to NULL.
> so the statement is always false.
>
>         if (agg && MAC_ADDRESS_COMPARE(&agg->partner_system, &null_mac_addr)) {
>                 if (!netif_carrier_ok(bond->dev)) {
>                         netif_carrier_on(bond->dev);
>                         return 1;
>                 }
>                 return 0;
>         }
> ----
>
-
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