netdev - RE: [PATCH RESEND] bnx2x: fix crash during TSO tunneling

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Date:	Thu, 24 Jul 2014 21:48:34 +0000
From:	Dmitry Kravkov <Dmitry.Kravkov@...gic.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Dmitry Kravkov <dkravkov@...il.com>
CC:	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	"ypei@...hat.com" <ypei@...hat.com>,
	"mschmidt@...hat.com" <mschmidt@...hat.com>
Subject: RE: [PATCH RESEND] bnx2x: fix crash during TSO tunneling


> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
> Sent: Thursday, July 24, 2014 7:38 PM
> To: Dmitry Kravkov
> Cc: netdev; David Miller; ypei@...hat.com; mschmidt@...hat.com; Dmitry
> Kravkov
> Subject: Re: [PATCH RESEND] bnx2x: fix crash during TSO tunneling
> 
> On Thu, 2014-07-24 at 18:54 +0300, Dmitry Kravkov wrote:
> > From: Dmitry Kravkov <Dmitry.Kravkov@...gic.com>
> >
> > When TSO packet is transmitted additional BD w/o mapping is used to
> > describe the packed. The BD needs special handling in tx completion.
> >
> > kernel: Call Trace:
> > kernel: <IRQ>  [<ffffffff815e19ba>] dump_stack+0x19/0x1b
> > kernel: [<ffffffff8105dee1>] warn_slowpath_common+0x61/0x80
> > kernel: [<ffffffff8105df5c>] warn_slowpath_fmt+0x5c/0x80
> > kernel: [<ffffffff814a8c0d>] ? find_iova+0x4d/0x90
> > kernel: [<ffffffff814ab0e2>] intel_unmap_page.part.36+0x142/0x160
> > kernel: [<ffffffff814ad0e6>] intel_unmap_page+0x26/0x30
> > kernel: [<ffffffffa01f55d7>] bnx2x_free_tx_pkt+0x157/0x2b0 [bnx2x]
> > kernel: [<ffffffffa01f8dac>] bnx2x_tx_int+0xac/0x220 [bnx2x]
> > kernel: [<ffffffff8101a0d9>] ? read_tsc+0x9/0x20
> > kernel: [<ffffffffa01f8fdb>] bnx2x_poll+0xbb/0x3c0 [bnx2x]
> > kernel: [<ffffffff814d041a>] net_rx_action+0x15a/0x250
> > kernel: [<ffffffff81067047>] __do_softirq+0xf7/0x290
> > kernel: [<ffffffff815f3a5c>] call_softirq+0x1c/0x30
> > kernel: [<ffffffff81014d25>] do_softirq+0x55/0x90
> > kernel: [<ffffffff810673e5>] irq_exit+0x115/0x120
> > kernel: [<ffffffff815f4358>] do_IRQ+0x58/0xf0
> > kernel: [<ffffffff815e94ad>] common_interrupt+0x6d/0x6d
> > kernel: <EOI>  [<ffffffff810bbff7>] ? clockevents_notify+0x127/0x140
> > kernel: [<ffffffff814834df>] ? cpuidle_enter_state+0x4f/0xc0
> > kernel: [<ffffffff81483615>] cpuidle_idle_call+0xc5/0x200
> > kernel: [<ffffffff8101bc7e>] arch_cpu_idle+0xe/0x30
> > kernel: [<ffffffff810b4725>] cpu_startup_entry+0xf5/0x290
> > kernel: [<ffffffff815cfee1>] start_secondary+0x265/0x27b
> > kernel: ---[ end trace 11aa7726f18d7e80 ]---
> >
> > Reported-by: Yulong Pei <ypei@...hat.com>
> > Cc: Michal Schmidt <mschmidt@...hat.com>
> > Signed-off-by: Dmitry Kravkov <Dmitry.Kravkov@...gic.com>
> > ---
> 
> How old is this bug ? Can you point original commit adding it ?
> 
> Thanks !
>
Added with initial TSO support for tunneling back in 3.10 with
a848ade408b6bfab59d575d6c246efb20afe88e3 
"bnx2x: add CSUM and TSO support for encapsulation protocols"
and can be seen only with *_iommu=on