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| author |   Vlad Yasevich <vyasevich@gmail.com> | 2017-05-23 13:38:41 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-05-24 16:27:14 -0400 |
| commit | 35d2f80b07bbe03fb358afb0bdeff7437a7d67ff (patch) | |
| tree | bc2dc13dc4416dae8b0a57460f5d13aa65e6ffec /drivers/net/ethernet/emulex/benet/be_main.c | |
| parent | net: phy: marvell: Limit errata to 88m1101 (diff) | |
| download | linux-dev-35d2f80b07bbe03fb358afb0bdeff7437a7d67ff.tar.xz linux-dev-35d2f80b07bbe03fb358afb0bdeff7437a7d67ff.zip | |
vlan: Fix tcp checksum offloads in Q-in-Q vlans
It appears that TCP checksum offloading has been broken for
Q-in-Q vlans. The behavior was execerbated by the
series
commit afb0bc972b52 ("Merge branch 'stacked_vlan_tso'")
that that enabled accleleration features on stacked vlans.
However, event without that series, it is possible to trigger
this issue. It just requires a lot more specialized configuration.
The root cause is the interaction between how
netdev_intersect_features() works, the features actually set on
the vlan devices and HW having the ability to run checksum with
longer headers.
The issue starts when netdev_interesect_features() replaces
NETIF_F_HW_CSUM with a combination of NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM,
if the HW advertises IP|IPV6 specific checksums. This happens
for tagged and multi-tagged packets. However, HW that enables
IP|IPV6 checksum offloading doesn't gurantee that packets with
arbitrarily long headers can be checksummed.
This patch disables IP|IPV6 checksums on the packet for multi-tagged
packets.
CC: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
CC: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Acked-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/emulex/benet/be_main.c')
0 files changed, 0 insertions, 0 deletions