Re: softirqs are invoked while bottom halves are masked

Le mercredi 13 juillet 2011 à 09:20 +0200, Thomas De Schampheleire a
écrit :

I just want to mention that, although you seem to think that we
shouldn't have created this thread in the first place, your and Eric's
remarks have actually helped us in identifying the problem and
increasing our understanding.

Thread was fine IMHO, but should have mentioned the context of "non
standard linux-2.6 or net-next-2.6 trees"

I would like to mention NETIF_F_LLTX existence.

While being marked deprecated, it allows a lockless tx path :

The device transmit handler can then perform custom actions, including
its own locking if needed.

If the user wants a specific Qdisc setup (instead of a no qdisc one), it
still can.

veth, loopback, dummy, macvlan & bond devices use NETIF_F_LLTX for
example.

But ndo_start_xmit() must always be called with BH disabled.