netdev - Re: 3.3.0-rc5: OOps in dql_completed (Broadcom tg3 driver)

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Message-ID: <CA+mtBx_vNcPr-q7FSKXCAsVqvjZt=4UpWfv5eAp0=diG0wnbjQ@mail.gmail.com>
Date:	Fri, 2 Mar 2012 09:23:20 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Christoph Lameter <cl@...two.org>, mcarlson@...adcom.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: 3.3.0-rc5: OOps in dql_completed (Broadcom tg3 driver)

Hi Christoph, Eric,

Looks like we're hitting BUG_ON(count > dql->num_queued -
dql->num_completed).  This is indicative of mis-accounting occurring
between netdev_sent_queue and netdev_completed_queue.  I don't
immediately see how this could happen here in the tg3_tso_bug path,
this is still using the same calls to transmit and complete as other
paths.  I suppose it's possible that skb_gso_segment is somehow
munging skb->len in segments.

I'll try to reproduce this.

> In case we hit BQL limit in one of the tg3_start_xmit() calls, we should
> 'abort' the following ones, dont you think ?

I'm not sure what you mean Eric.  It should be okay to exceed the BQL
limit up to the point that num_queued rolls over (probably should be a
BUG_ON for that).  This is a much greater number than could ever be
queued to tg3.

Thanks,
Tom

>
> Or maybe thats irrelevant, and only dql_queued() comment is wrong.
>
> Thanks
>
>
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