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Date: Mon, 10 Oct 2011 12:16:41 -0700
From: John Fastabend <john.r.fastabend@...el.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, jpirko@...hat.com, jesse@...ira.com,
fubar@...ibm.com
Subject: [net-next PATCH] net: allow vlan traffic to be received under bond
The following configuration used to work as I expected. At least
we could use the fcoe interfaces to do MPIO and the bond0 iface
to do load balancing or failover.
---eth2.228-fcoe
|
eth2 -----|
|
|---- bond0
|
eth3 -----|
|
---eth3.228-fcoe
This worked because of a change we added to allow inactive slaves
to rx 'exact' matches. This functionality was kept intact with the
rx_handler mechanism. However now the vlan interface attached to the
active slave never receives traffic because the bonding rx_handler
updates the skb->dev and goto's another_round. Previously, the
vlan_do_receive() logic was called before the bonding rx_handler.
Now by the time vlan_do_receive calls vlan_find_dev() the
skb->dev is set to bond0 and it is clear no vlan is attached
to this iface. The vlan lookup fails.
This patch moves the VLAN check above the rx_handler. A VLAN
tagged frame is now routed to the eth2.228-fcoe iface in the
above schematic. Untagged frames continue to the bond0 as
normal. This case also remains intact,
eth2 --> bond0 --> vlan.228
Here the skb is VLAN tagged but the vlan lookup fails on eth2
causing the bonding rx_handler to be called. On the second
pass the vlan lookup is on the bond0 iface and completes as
expected.
Putting a VLAN.228 on both the bond0 and eth2 device will
result in eth2.228 receiving the skb. I don't think this is
completely unexpected and was the result prior to the rx_handler
result.
Note, the same setup is also used for other storage traffic that
MPIO is used with eg. iSCSI and similar setups can be contrived
without storage protocols.
Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
---
net/core/dev.c | 22 +++++++++++-----------
1 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 70ecb86..8b6118a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3231,6 +3231,17 @@ another_round:
ncls:
#endif
+ if (vlan_tx_tag_present(skb)) {
+ if (pt_prev) {
+ ret = deliver_skb(skb, pt_prev, orig_dev);
+ pt_prev = NULL;
+ }
+ if (vlan_do_receive(&skb))
+ goto another_round;
+ else if (unlikely(!skb))
+ goto out;
+ }
+
rx_handler = rcu_dereference(skb->dev->rx_handler);
if (rx_handler) {
if (pt_prev) {
@@ -3251,17 +3262,6 @@ ncls:
}
}
- if (vlan_tx_tag_present(skb)) {
- if (pt_prev) {
- ret = deliver_skb(skb, pt_prev, orig_dev);
- pt_prev = NULL;
- }
- if (vlan_do_receive(&skb))
- goto another_round;
- else if (unlikely(!skb))
- goto out;
- }
-
/* deliver only exact match when indicated */
null_or_dev = deliver_exact ? skb->dev : NULL;
--
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