From: Eric Dumazet <eric.dumazet@gmail.com>
To: Thomas De Schampheleire <patrickdepinguin+linuxppc@gmail.com>
Cc: linuxppc-dev@ozlabs.org, netdev@vger.kernel.org,
afleming@freescale.com, David Miller <davem@davemloft.net>,
ronny.meeus@gmail.com
Subject: Re: softirqs are invoked while bottom halves are masked
Date: Wed, 13 Jul 2011 09:38:53 +0200 [thread overview]
Message-ID: <1310542733.2634.17.camel@edumazet-laptop> (raw)
In-Reply-To: <CAAXf6LXddZUHEz738DDTi-XqENRYT7dTODw+1C4RTYsCdyro7g@mail.gmail.com>
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.
next prev parent reply other threads:[~2011-07-13 7:39 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-12 9:23 softirqs are invoked while bottom halves are masked (was: Re: [PATCH] [PATCH] Fix deadlock in af_packet while stressing raw ethernet socket interface) Thomas De Schampheleire
2011-07-12 10:01 ` softirqs are invoked while bottom halves are masked David Miller
2011-07-12 10:10 ` softirqs are invoked while bottom halves are masked (was: Re: [PATCH] [PATCH] Fix deadlock in af_packet while stressing raw ethernet socket interface) Eric Dumazet
2011-07-12 12:03 ` Ronny Meeus
2011-07-12 12:08 ` softirqs are invoked while bottom halves are masked David Miller
2011-07-12 12:13 ` David Miller
2011-07-13 7:20 ` Thomas De Schampheleire
2011-07-13 7:38 ` Eric Dumazet [this message]
2011-07-12 15:27 ` softirqs are invoked while bottom halves are masked (was: Re: [PATCH] [PATCH] Fix deadlock in af_packet while stressing raw ethernet socket interface) Eric Dumazet
2011-07-12 19:52 ` Ronny Meeus
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