Re: DPDK RSS support for ixgbevf PMD

[Vlad Zolotarov <vladz-RmZWMc9puTNJc61us3aD9laTQe2KTcn/@public.gmane.org>]

On 12/15/14 22:33, Thomas Monjalon wrote:
> 2014-12-15 21:11, Vladislav Zolotarov:
>> Hi,
>> I'm running an ixgbevf PMD on an AWS guests with extended networking
>> (SR-IOV functions of 82599 Intel's NIC) and noticed that even in the
>> current git tree there is no support for a multi-queue in this PMD: reta
>> size returned by rte_eth_dev_info_get() call is 0, while max_rx_queues and
>> max_tx_queues are both 4.
>>
>> Linux ixgbevf-2.15.3 driver on the other hand successfully initializes 2
>> RSS queues: for some reason it always limits the number of RSS queues by 2.
>>
>> ixgbevf_main.c: line 2539
>> u16 rss = min_t(u16, num_online_cpus(), 2);
>>
>> The above is strange since if MRQE is set to 1010b there are 4 RSS queues
>> available which seems to be the case in my AWS Guest.
>>
>> However, let's get back to DPDK. As I've mentioned above the SR-IOV
>> function i have is RSS capable (to be 100% sure I've verified both queues
>> are receiving packets in a multi-socket TCP test). And it's a shame I can't
>> utilize it with a DPDK.
> Yes, it is not yet supported.
> But a patch was recently sent:
> 	http://dpdk.org/ml/archives/dev/2014-December/010028.html

Applying this patchset seems to break the NIC fast path functionality of 
a AWS Guest NIC.
I'm still debugging it - will update u as soon as I have more specific info.

vlad

>
>> I wonder if there are any blockers to add this capability to the ixgbevf
>> PMD and if not is it scheduled to some time soon?
> Please jump in the above thread for your questions.
>
> My turn to ask a question:
> Does it mean DPDK is going to be supported in your system (OSv)?
> I've seen it in the OSv roadmap.
> Could we have more details about how it would be integrated?
>
> Thanks