| From | Kamal Mostafa <> | Subject | [PATCH 3.13 039/212] Revert "macvlan : fix checksums error when we are in bridge mode" | Date | Tue, 17 Jun 2014 14:42:13 -0700 |
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3.13.11.4 -stable review patch. If anyone has any objections, please let me know.
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From: Vlad Yasevich <vyasevic@redhat.com>
[ Upstream commit f114890cdf84d753f6b41cd0cc44ba51d16313da ]
This reverts commit 12a2856b604476c27d85a5f9a57ae1661fc46019. The commit above doesn't appear to be necessary any more as the checksums appear to be correctly computed/validated.
Additionally the above commit breaks kvm configurations where one VM is using a device that support checksum offload (virtio) and the other VM does not. In this case, packets leaving virtio device will have CHECKSUM_PARTIAL set. The packets is forwarded to a macvtap that has offload features turned off. Since we use CHECKSUM_UNNECESSARY, the host does does not update the checksum and thus a bad checksum is passed up to the guest.
CC: Daniel Lezcano <daniel.lezcano@free.fr> CC: Patrick McHardy <kaber@trash.net> CC: Andrian Nord <nightnord@gmail.com> CC: Eric Dumazet <eric.dumazet@gmail.com> CC: Michael S. Tsirkin <mst@redhat.com> CC: Jason Wang <jasowang@redhat.com> Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/net/macvlan.c | 3 --- 1 file changed, 3 deletions(-)
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index ac8355f..fbb21fa 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -263,11 +263,9 @@ static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) const struct macvlan_dev *vlan = netdev_priv(dev); const struct macvlan_port *port = vlan->port; const struct macvlan_dev *dest; - __u8 ip_summed = skb->ip_summed; if (vlan->mode == MACVLAN_MODE_BRIDGE) { const struct ethhdr *eth = (void *)skb->data; - skb->ip_summed = CHECKSUM_UNNECESSARY; /* send to other bridge ports directly */ if (is_multicast_ether_addr(eth->h_dest)) { @@ -285,7 +283,6 @@ static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) } xmit_world: - skb->ip_summed = ip_summed; skb->dev = vlan->lowerdev; return dev_queue_xmit(skb); } -- 1.9.1
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