TSO issue - "DNAT/mark based routing/MASQUEARDE on locally genrated traffic"

TSO issue - "DNAT/mark based routing/MASQUEARDE on locally genrated traffic"

[Nishit Shah]

Hi,
                Whenever there is a output device change for locally
generated traffic due to,
                           DNAT/mark based routing in OUTPUT nat/mangle
                           MASQURADE in POSTROUTING nat
                 NETIF_F_TSO flag is not unset from sk->sk_route_caps.

So, there are chances that, output device returned at TCP/IP layer
routing supports NETIF_F_TSO  and changed output device due to
DNAT/mark based routing/MASQUERADE doesn’t support NETIF_F_TSO.
In some of my experiments for some interfaces, I got “NETDEV_WATCHDOG:
eth1 transmit timeout” messages and for some others packets doesn’t go
out of the box.
Currently I have disabled TSO on all interfaces through ethtool.

Is there any other way to solve this issue (something like resetting
the flag in route_me_harder() if device doesn’t support TSO ) ?

Rgds,
Nishit Shah.
--
To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html