netdev - Re: does intel X520-SR(ixgbe) support RSS on single VLAN?

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Date:	Tue, 25 Jan 2011 17:03:10 +0800
From:	Rui <wirelesser@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Alexander Duyck <alexander.h.duyck@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>
Subject: Re: does intel X520-SR(ixgbe) support RSS on single VLAN?

On Tue, Jan 25, 2011 at 11:05 AM, Ben Hutchings
<bhutchings@...arflare.com> wrote:
> On Tue, 2011-01-25 at 10:10 +0800, Rui wrote:
>> On Tue, Jan 25, 2011 at 1:09 AM, Alexander Duyck
>> <alexander.h.duyck@...el.com> wrote:
>> > On 1/24/2011 6:18 AM, Rui wrote:
>> >>
>> >> hi
>> >> does intel X520-SR support RSS on single VLAN?
>> >>
>> >> tested with 3 different vlan id and priority packets
>> >> What I saw is that all packets were always delivered to the same RxQ.
>> >> looks can not get a different RSS index for these packet?
>> >> any setting needed?
>> >> --
>> >> 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
>> >
>> > The X520 should have no problems hashing on a single VLAN tagged frame.
>> >  However the VLAN will not be a part of the RSS hash.  The  only components
>> > of the hash are the IPv4/IPv6 source and destination addresses, and if the
>> > flow is TCP then the port numbers.
>> >
>> hi alexander
>> I got these information from the intel community:
>>
>> 'I asked our software engineers about your question, and this is what I learned.
>> You cannot filter by just VLAN or VLAN priority.  The L4 type will
>> also play a role in the filter and as such you would only be able to
>> filter TCP, UDP, and SCTP packets that are bound for a VLAN.
>> The command itself to setup a filter is “ethtool –U ethX flow-type
>> tcp4 vlan 0x2000 vlan-mask 0xE000 action Y” where X is the correct
>> index for the interface and Y is the queue you want to route the
>> traffic to.  This would have to be repeated for udp4 and sctp4.
>> I hope this will help.
>> Mark H"
>
> The mask specifies bits to be ignored, so if you want to filter on the
> basis of only the priority bits you should use vlan-mask 0xfff.  Unless
> this is another inconsistency I failed to notice...
>
>> so my question is that the VLAN is PART of the RSS or not?
>
> It's not part of any specified Toeplitz hash.  However, some hardware
> supports adding the hash (after indirection) to the queue number
> specified by a filter.  Currently the ethtool API doesn't have a way to
> request that.
>
>> looks the
>> perfect filter support vlan id ?can the perfect filter support
>> wildchar,such as: flow-type ANY?
>
> It is possible to specify this using flow-type ether, but the ixgbe
> driver does not yet support that (and I have no idea whether the
> hardware does).
>
> Ben.
>
> --
> Ben Hutchings, Senior Software Engineer, Solarflare Communications
> Not speaking for my employer; that's the marketing department's job.
> They asked us to note that Solarflare product names are trademarked.
>
>

I got this msg:
Cannot add new RX n-tuple filter: Operation not supported
This command is only supported after 2.6.34?
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