netdev - BQL support in gianfar causes network hickup

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Date:	Fri, 23 Nov 2012 16:58:13 +0100
From:	"Keitel, Tino (ALC NetworX GmbH)" <Tino.Keitel@...networx.de>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: BQL support in gianfar causes network hickup

Hi,

commit d8a0f1b0af67679bba886784de10d8c21acc4e0e causes the following
trace on a Freescale RDB8313 board:

NETDEV WATCHDOG: eth1 (fsl-gianfar): transmit queue 0 timed out
------------[ cut here ]------------
WARNING:
at /home/keitelt1/src/git/linux-stable/net/sched/sch_generic.c:255
Modules linked in:
NIP: c02448b0 LR: c02448b0 CTR: c01c19b8
REGS: c7ffbe40 TRAP: 0700   Not tainted  (3.7.0-rc6-rt18)
MSR: 00029032 <EE,ME,IR,DR,RI>  CR: 24002044  XER: 20000000
TASK = c03dd370[0] 'swapper' THREAD: c03fe000
GPR00: c02448b0 c7ffbef0 c03dd370 0000003f 00000001 c001aea8 00000000
00000001
GPR08: 00000001 c03e0000 00000000 0000009d 24002084 1008eb5c 07ffb000
ffffffff
GPR16: 00000004 c0362c7c c03dfbf8 00200000 c0411ed0 c0411cd0 c0411ad0
ffffffff
GPR24: 00000000 c749e1d8 00000004 c783d1b0 c0400000 c03e0000 c749e000
00000000
NIP [c02448b0] dev_watchdog+0x288/0x298
LR [c02448b0] dev_watchdog+0x288/0x298
Call Trace:
[c7ffbef0] [c02448b0] dev_watchdog+0x288/0x298 (unreliable)
[c7ffbf20] [c00267f8] call_timer_fn+0x6c/0xd8
[c7ffbf50] [c00269e4] run_timer_softirq+0x180/0x1f8
[c7ffbfa0] [c0021144] __do_softirq+0xc4/0x160
[c7ffbff0] [c000d0b8] call_do_softirq+0x14/0x24
[c03ffe90] [c00058e8] do_softirq+0x8c/0xb8
[c03ffeb0] [c0021358] irq_exit+0x98/0xb4
[c03ffec0] [c0009fb0] timer_interrupt+0x158/0x170
[c03ffee0] [c000f02c] ret_from_except+0x0/0x14
--- Exception: 901 at cpu_idle+0x94/0x100
    LR = cpu_idle+0x94/0x100
[c03fffa0] [c00088ec] cpu_idle+0x5c/0x100 (unreliable)
[c03fffc0] [c03b37b0] start_kernel+0x2dc/0x2f0
[c03ffff0] [00003438] 0x3438
Instruction dump:
7d2903a6 4e800421 80fe01fc 4bffff74 7fc3f378 4bfecb7d 7fc4f378 7fe6fb78
7c651b78 3c60c038 38637280 48090e69 <0fe00000> 39200001 993cc7c9
4bffffb8
---[ end trace 32125455035c2f70 ]---

With this commit reverted, it works fine. v3.3 is ok, v3.4 contains the
bad commit. The commit doesn't revert in a clean way in 3.7-rc6. I
attached diff without the tqi changes.

The above trace happens while a ptp client (for IEEE1588) is running, so
there is some locally generated network traffic. The client stops to
work after this, but maybe this is due to bad error handling.

Regards,
Tino


View attachment "gianfar_fix_ptp.diff" of type "text/x-patch" (2551 bytes)