linux-kernel - Re: [ 33/52] net: Fix issue with netdev_tx_reset_queue not resetting queue from XOFF state

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FAC26A5.3050606@intel.com>
Date:	Thu, 10 May 2012 13:35:49 -0700
From:	Alexander Duyck <alexander.h.duyck@...el.com>
To:	Jonathan Nieder <jrnieder@...il.com>
CC:	David Miller <davem@...emloft.net>, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, stephen.s.ko@...el.com,
	jeffrey.t.kirsher@...el.com
Subject: Re: [ 33/52] net: Fix issue with netdev_tx_reset_queue not resetting
 queue from XOFF state

On 05/10/2012 12:46 PM, Jonathan Nieder wrote:
> David Miller wrote:
>> From: Alexander Duyck <alexander.h.duyck@...el.com>
>>> All of the changes in igb are unnecessary.  I think they can be dropped
>>> from the patch as they have already been reverted from the latest
>>> net-next.  The only change that is really needed is the piece in
>>> netdevice.h below.
>> Does it hurt?  If not, just let it be.
> Based on the commit description for dad8a3b3eaa0 ("igb, ixgbe:
> netdev_tx_reset_queue incorrectly called from tx init path"), yes, it
> hurts.  I don't know if it hurts enough to justify holding up this
> patch until dad8a3b3eaa0 hits mainline.
>
> |                            this sort of works in most cases except
> | when the number of real tx queues changes. When the number of real
> | tx queues changes netdev_tx_reset_queue() only gets called on the
> | new number of queues so when we reduce the number of queues we risk
> | triggering the watchdog timer and repeated device resets.
> |
> | So this is not only a cosmetic issue but causes real bugs. For
> | example enabling/disabling DCB or FCoE in ixgbe will trigger this.
I'm fairly certain we really shouldn't make the changes to igb.  I would
say to just modify the existing patch by just dropping the igb portion
of it and it would be fine.

Thanks,

Alex
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/