netdev - Re: [PATCH net-next] ixgbe: flush when in xmit_more mode and under descriptor pressure

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] [day] [month] [year] [list]

Date:	Tue, 26 Aug 2014 09:24:16 -0700
From:	Alexander Duyck <alexander.h.duyck@...el.com>
To:	Daniel Borkmann <dborkman@...hat.com>
CC:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ixgbe: flush when in xmit_more mode and under
 descriptor pressure

On 08/26/2014 09:21 AM, Daniel Borkmann wrote:
> On 08/26/2014 06:01 PM, Alexander Duyck wrote:
> ...
>> My thought is to just fold ixgbe_maybe_stop_tx into the if statement.
>>
>> So it shoudl be:
>>   if (!skb->smit_more || ixgbe_maybe_stop_tx(tx_ring, DESC_NEEDED))
> 
> Right, that's better; I was just thinking about the DMA error case,
> but in that case we release resources back anyway.

Actually the order does need to be reversed though.  We should test for
stop_tx first, then xmit_more.  Doing it the other way around would
cause issues as maybe_stop_tx has some other side effects.

Thaks,

Alex
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html