From: Ben Greear <greearb@candelatech•com>
To: Jiri Pirko <jpirko@redhat•com>
Cc: netdev@vger•kernel.org, davem@davemloft•net,
shemminger@linux-foundation•org, kaber@trash•net,
fubar@us•ibm.com, eric.dumazet@gmail•com,
nicolas.2p.debian@gmail•com, andy@greyhouse•net
Subject: Re: [RFC patch net-next-2.6] net: allow multiple rx_handler registration
Date: Thu, 30 Jun 2011 11:53:50 -0700 [thread overview]
Message-ID: <4E0CC63E.3090807@candelatech.com> (raw)
In-Reply-To: <20110630182855.GD2056@minipsycho>
On 06/30/2011 11:28 AM, Jiri Pirko wrote:
> Thu, Jun 30, 2011 at 08:13:59PM CEST, greearb@candelatech•com wrote:
>> On 06/30/2011 08:16 AM, Jiri Pirko wrote:
>>> For some net topos it is necessary to have multiple "soft-net-devices"
>>> hooked on one netdev. For example very common is to have
>>> eth<->(br+vlan). Vlan is not using rh_handler (yet) but also for example
>>> macvlan would be useful to have hooked on same netdev as br.
>>>
>>> This patch introduces rx_handler list. size struct net_device stays
>>> intact. Measured performance regression on eth-br topo is ~1% (on received
>>> pkts generated by pktgen) and on eth-bond topo it is ~0.25%
>>>
>>> On br I think that the performance can be brought back maybe by using per-cpu
>>> variables to store port in rx_path (I must check this)
>>
>>> +enum rx_handler_prio {
>>> + RX_HANDLER_PRIO_BRIDGE,
>>> + RX_HANDLER_PRIO_BOND,
>>> + RX_HANDLER_PRIO_MACVLAN,
>>> +};
>>
>> Maybe add RX_HANDLER_PRIO_LATER, RX_HANDLER_PRIO_FIRST
>> for other modules that want to link
>> here, but don't have specific ordering other than before
>> or after these specific types?
>>
>> Or maybe start PRIO_BRIDGE at 100, BOND 110, MACVLAN 120
>> to leave gaps.
>
> I was thinking about this. But that would be useful only for out of the
> tree drivers. For in tree drivers, new prio would be just inserted
> whereever.
There might be a reason to add a hook at various places, depending
on user prefs. I don't know of one now, so it could stay as is and
we could change it later if the need came up. I assume this PRIO stuff is
purely private to the kernel, so it should be easy to change...
Thanks,
Ben
--
Ben Greear <greearb@candelatech•com>
Candela Technologies Inc http://www.candelatech.com
next prev parent reply other threads:[~2011-06-30 18:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-30 15:16 [RFC patch net-next-2.6] net: allow multiple rx_handler registration Jiri Pirko
2011-06-30 16:27 ` Stephen Hemminger
2011-06-30 17:22 ` Jiri Pirko
2011-06-30 17:29 ` Ben Greear
2011-06-30 17:32 ` Jiri Pirko
2011-07-01 6:36 ` Michał Mirosław
2011-07-01 14:57 ` Nicolas de Pesloüan
2011-07-01 15:00 ` Jiri Pirko
2011-07-01 15:01 ` Michał Mirosław
2011-07-01 16:45 ` Nicolas de Pesloüan
2011-07-01 16:49 ` Ben Greear
2011-07-01 16:58 ` Nicolas de Pesloüan
2011-07-01 17:08 ` David Lamparter
2011-07-01 17:50 ` Michał Mirosław
2011-06-30 18:13 ` Ben Greear
2011-06-30 18:28 ` Jiri Pirko
2011-06-30 18:53 ` Ben Greear [this message]
2011-06-30 19:50 ` Nicolas de Pesloüan
2011-07-01 5:45 ` Jiri Pirko
2011-07-01 16:55 ` David Lamparter
2011-07-01 12:48 ` Jiri Pirko
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