netdev - Re: [PATCH net-next-2.6] tc: report informations for multiqueue devices

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]

Date:	Wed, 02 Sep 2009 15:49:59 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
CC:	David Miller <davem@...emloft.net>, jarkao2@...il.com,
	cl@...ux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] tc: report informations for multiqueue devices

Patrick McHardy a écrit :
> Eric Dumazet wrote:
>> [PATCH net-next-2.6] tc: report informations for multiqueue devices
>>
>> qdisc and classes are not yet displayed by "tc -s -d {qdisc|class} show"
>> for multiqueue devices.
>>
>> We use a new TCA_QINDEX attribute, to report queue index to user space.
>> iproute2 tc should be changed to eventually display this queue index as in :
>>
>> $ tc -s -d qdisc
>> qdisc pfifo_fast 0: dev eth0 root bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
>>  Sent 52498 bytes 465 pkt (dropped 0, overlimits 0 requeues 0)
>>  rate 0bit 0pps backlog 0b 0p requeues 0
>> qdisc pfifo_fast 0: dev eth0 qindex 1 root bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
>>  Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>>  rate 0bit 0pps backlog 0b 0p requeues 0
> 
> This might confuse existing userspace since the handle is not unique
> anymore. libnl f.i. will treat all but the first root qdisc as an
> update and use it to update the state of the first one. There's also
> no combined view for applications unaware of multiqueue.
> 
> Please have a look at the mail I just wrote for some possible ways
> around this.

Hum, how can we combine infos on qdisc/class if in the future we allow each queue index
to have its own qdisc/classes ?

htb on queue index 0
cbq on queue index 1

Combining info would lock us and not allow for special configurations.
Say 
   macvlan device 0 mapped to queue index 0
   macvlan device 1 mapped to queue index 1...

For old apps, just give informations for queue 0 as we do now, and
allow kernel to give more informations only if new application provided a TCA_INDEX attribute
in its request ?

(-1 : all queue indexes,  >=0 for a given queue index)
--
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