Re: [E1000-devel] Issues with x520/ixgbe when enabling forwarding

[Tantilov, E. S <emi...@in...>]

>-----Original Message-----
>From: Daniel S. Cohen [mailto:ds...@te...]
>Sent: Thursday, May 08, 2014 10:10 AM
>To: e10...@li...
>Subject: [E1000-devel] Issues with x520/ixgbe when enabling
>forwarding
>
>Hello,
>
>I have a pair of Dell PowerEdge R720s running Fedora 20 and
>a 3.13.11
>kernel built from kernel.org.  The system has 7 dual port x520 cards,
>and becomes unstable when I enable forwarding.
>
>system details:
>
># ethtool -i eth0
>driver: ixgbe
>version: 3.15.1-k
>firmware-version: 0x80000656
>bus-info: 0000:03:00.0
>supports-statistics: yes
>supports-test: yes
>supports-eeprom-access: yes
>supports-register-dump: yes
>supports-priv-flags: no

This is a known bug in ixgbe where ndo_start_xmit can be called while the driver is resetting. This is pretty easy to see when using netconsole.

This is the upstream patch:
https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c?id=cdc04dcce0598fead6029a2f95e95a4d2ea419c2

It is also resolved in the current ixgbe version on SF.

Thanks,
Emil