Hi > -----Original Message----- > From: Vlad Zolotarov [mailto:vladz at cloudius-systems.com] > Sent: Wednesday, December 17, 2014 4:47 PM > To: Ouyang, Changchun; Thomas Monjalon > Cc: dev at dpdk.org; Avi Kivity; Gleb Natapov > Subject: Re: [dpdk-dev] DPDK RSS support for ixgbevf PMD > > > On 12/17/14 03:03, Ouyang, Changchun wrote: > > Hi , > > > >> -----Original Message----- > >> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Vlad Zolotarov > >> Sent: Tuesday, December 16, 2014 11:36 PM > >> To: Thomas Monjalon > >> Cc: dev at dpdk.org; Avi Kivity; Gleb Natapov > >> Subject: Re: [dpdk-dev] DPDK RSS support for ixgbevf PMD > >> > >> > >> 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. > > Hi, thanks for tips but I have a question below. > > > Pls make sure enabling and using 4 queues on guest > > Why should I enable all 4? Won't any number below or equal 4 work if (!) > 4 queues are available? > Note that there is a 82599 mode when only 2 RSS queues are available per > VF: MRQE=1011b. >
Yes you are right, it could be 2 queues, the actual queue number per VF depends on the number of VF: VF number from 1~32: 4 queues per VF; VF number from 33~64: 2 queues per VF; The queue number is determined by the vf number at the pf init stage, If pf setup 4 queues for each vf and distribute packets to 4 queues, but vf only poll 1 or 2 queue, Then packets in other queues will be lost. You can try to poll 4 queues firstly to debug your issue. Thanks Changchun