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.
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