netdev - LRO disable warnings on kernel 2.6.38

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Date:	Fri, 18 Mar 2011 12:12:23 +0100
From:	Jesper Dangaard Brouer <jdb@...x.dk>
To:	netdev <netdev@...r.kernel.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Neil Horman <nhorman@...driver.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>
Subject: LRO disable warnings on kernel 2.6.38

Hi

I'm seeing the LRO disable warnings using kernel 2.6.38:

[    8.664759] NET: Registered protocol family 10
[    8.838148] ADDRCONF(NETDEV_UP): eth71: link is not ready
[    8.872639] ------------[ cut here ]------------
[    8.872645] WARNING: at net/core/dev.c:1363 dev_disable_lro+0x7b/0x80()
[    8.872647] Hardware name: ProLiant DL370 G6
[    8.872648] Modules linked in: ipv6 nf_conntrack ip_tables loop i7core_edac edac_core ipmi_si ipmi_msghandler joydev hpilo pcspkr sg hpsa igb ata_piix netxen_nic dca [last unloaded: scsi_wait_scan]
[    8.872660] Pid: 2221, comm: sysctl Not tainted 2.6.38-comx04 #2
[    8.872662] Call Trace:
[    8.872671]  [<ffffffff81056e1f>] ? warn_slowpath_common+0x7f/0xc0
[    8.872675]  [<ffffffff81056e7a>] ? warn_slowpath_null+0x1a/0x20
[    8.872680]  [<ffffffff8140c0ab>] ? dev_disable_lro+0x7b/0x80
[    8.872686]  [<ffffffff81474f27>] ? devinet_sysctl_forward+0x147/0x180
[    8.872691]  [<ffffffff811872f7>] ? proc_sys_call_handler+0x97/0xd0
[    8.872700]  [<ffffffff81187344>] ? proc_sys_write+0x14/0x20
[    8.872704]  [<ffffffff81124148>] ? vfs_write+0xc8/0x180
[    8.872707]  [<ffffffff81124301>] ? sys_write+0x51/0x90
[    8.872712]  [<ffffffff8100b8c2>] ? system_call_fastpath+0x16/0x1b
[    8.872714] ---[ end trace 6245283cb8d484cc ]---

The strange part is that I didn't see this warning on my testlab and
pre-prod servers.  The warning is from the first production server,
which got kernel 2.6.38 deployed this morning.

The NIC driver is igb.

The only difference in hardware between the production and
pre-production server (which didn't show the warning), is the
prod-server have an extra dual-port original Intel NIC, dev-named
"eth71".  And its just after the init of eth71, the warning occurs.

We usually use a 6 port NIC from Hotlava, which is based on the same
chip 82576 and also uses the same igb driver.

Intel orig NIC eth71
 albpd4:~# ethtool -i eth71
 driver: igb
 version: 2.1.0-k2
 firmware-version: 1.2-1
 bus-info: 0000:21:00.0

Hotlava Intel chip based NIC eth51:
 albpd4:~# ethtool -i eth51
 driver: igb
 version: 2.1.0-k2
 firmware-version: 1.2-1
 bus-info: 0000:1d:00.1

I don't understand why I don't see the warning on my pre-prod server,
which only have the Hotlava NIC?!?

-- 
Med venlig hilsen / Best regards
  Jesper Brouer
  ComX Networks A/S
  Linux Network Kernel Developer
  Cand. Scient Datalog / MSc.CS
  Author of http://adsl-optimizer.dk
  LinkedIn: http://www.linkedin.com/in/brouer

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