netdev - Re: [PATCH net-next v5 1/2] net: Use 16bits for *

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Message-ID: <CAOesGMjuOaSr6vG+bPQGAdNKa4yeAOFLA+eyBHS+rDvevQASHQ@mail.gmail.com>
Date:	Wed, 29 May 2013 16:02:12 -0700
From:	Olof Johansson <olof@...om.net>
To:	Simon Horman <horms@...ge.net.au>
Cc:	dev <dev@...nvswitch.org>,
	Network Development <netdev@...r.kernel.org>,
	Jesse Gross <jesse@...ira.com>,
	Pravin B Shelar <pshelar@...ira.com>,
	"jarno.rajahalme" <jarno.rajahalme@....com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Maciej Żenczykowski <maze@...gle.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next v5 1/2] net: Use 16bits for *_headers fields of
 struct skbuff

Hi,

On Wed, May 29, 2013 at 3:54 PM, Simon Horman <horms@...ge.net.au> wrote:
> On Wed, May 29, 2013 at 02:46:05PM -0700, Olof Johansson wrote:
>> Sorry, that was not a great bug report.
>>
>> So, looks like it's the removal of NET_SKBUFF_DATA_USES_OFFSET that
>> does it for me.
>>
>> The devices I've seen it with are with asix usb-ethernet adapters (on
>> Tegra seaboard) and with mv643xx_eth on cubox (dove).
>>
>> I'll try to get a better stacktrace out of it. Simon, maybe you can
>> reproduce on shmobile hardware?
>
> Sure, I will try and reproduce it.
>
> I did subsequently post some fixes for fallout resulting from
> the patch listed below. Those changes are now net-next.
> Are you seeing the crash with those patches?
>
> The fix-up patches are:
>
> net,ipv4,ipv6: Correct assignment of skb->network_header to skb->tail
> sctp: Correct access to skb->{network,transport}_header
> ipv4: Correct comparisons and calculations using skb->tail and skb-transport_header
> ipv6: Correct comparisons and calculations using skb->tail and skb-transport_header
> net: Correct comparisons and calculations using skb->tail and skb-transport_header
> cxgb3: Correct comparisons and calculations using skb->tail and skb-transport_header
> isdn: Correct comparison of skb->tail and skb-transport_header
> net: Fix build warnings after mac_header and transport_header became __u16.

Ah, no, looks like those didn't make it into the 0529 linux-next.

I've merged net-next on top and retested, and I no longer see the panics.


Thanks!


-Olof
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