From: "Kok, Auke" <auke-jan.h.kok@intel.com>
To: David Miller <davem@davemloft.net>
Cc: gallatin@myri.com, joonwpark81@gmail.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, jgarzik@pobox.com,
shemminger@linux-foundation.org,
Jesse Brandeburg <jesse.brandeburg@intel.com>
Subject: Re: [RFC] net: napi fix
Date: Wed, 12 Dec 2007 10:41:59 -0800 [thread overview]
Message-ID: <47602B77.2090202@intel.com> (raw)
In-Reply-To: <20071212.093819.205755031.davem@davemloft.net>
David Miller wrote:
> From: Andrew Gallatin <gallatin@myri.com>
> Date: Wed, 12 Dec 2007 12:29:23 -0500
>
>> Is the netif_running() check even required?
>
> No, it is not.
>
> When a device is brought down, one of the first things
> that happens is that we wait for all pending NAPI polls
> to complete, then block any new polls from starting.
I think this was previously (pre-2.6.24) not the case, which is why e1000 et al
has this check as well and that's exactly what is causing most of the
net_rx_action oopses in the first place. Without the netif_running() check
previously the drivers were just unusable with NAPI and prone to many races with
down (i.e. touching some ethtool ioctl which wants to do a reset while routing
small packets at high numbers). that's why we added the netif_running() check in
the first place :)
There might be more drivers lurking that need this change...
Auke
next prev parent reply other threads:[~2007-12-12 18:45 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-12 17:29 [RFC] net: napi fix Andrew Gallatin
2007-12-12 17:38 ` David Miller
2007-12-12 17:40 ` Andrew Gallatin
2007-12-12 18:41 ` Kok, Auke [this message]
2007-12-13 7:41 ` Joonwoo Park
2007-12-13 14:13 ` Andrew Gallatin
2007-12-13 14:19 ` David Miller
2007-12-13 16:45 ` Kok, Auke
2007-12-13 18:22 ` Stephen Hemminger
2007-12-13 19:02 ` Andrew Gallatin
2007-12-13 19:09 ` David Miller
2007-12-13 19:35 ` Stephen Hemminger
2007-12-13 20:38 ` David Miller
2007-12-14 2:06 ` Joonwoo Park
2007-12-13 13:49 ` Jarek Poplawski
2007-12-13 13:50 ` David Miller
2007-12-13 14:14 ` Jarek Poplawski
2007-12-13 20:16 ` Jarek Poplawski
2007-12-13 20:37 ` David Miller
2007-12-13 20:41 ` Stephen Hemminger
2007-12-13 21:55 ` Jarek Poplawski
2007-12-13 22:28 ` Jarek Poplawski
2007-12-13 22:34 ` David Miller
2007-12-13 22:58 ` Jarek Poplawski
2007-12-20 9:52 ` Robert Olsson
2007-12-20 11:22 ` David Miller
-- strict thread matches above, loose matches on Subject: below --
2007-12-12 4:01 [PATCH 6/7] [NETDEV]: tehuti Fix possible causing oops of net_rx_action Joonwoo Park
2007-12-12 5:39 ` Stephen Hemminger
2007-12-12 5:46 ` [RFC] net: napi fix Stephen Hemminger
2007-12-12 6:05 ` Joonwoo Park
2007-12-12 15:22 ` David Miller
2007-12-12 15:21 ` David Miller
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