From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bruce Richardson Subject: Re: Using multi-queue with RSS on X540 VF Date: Mon, 15 Dec 2014 10:47:40 +0000 Message-ID: <20141215104739.GA11332@bricha3-MOBL3> References: Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Cc: "dev-VfR2kkLFssw@public.gmane.org" To: Anant Mudambi Return-path: Content-Disposition: inline In-Reply-To: List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org Sender: "dev" On Sat, Dec 13, 2014 at 01:44:36AM +0000, Anant Mudambi wrote: > Hi all, > I am using DPDK 1.7.0. > Qemu-KVM system with the Intel 10G X540 NIC; host has the Linux ixgbe P= F driver and a guest is using a VF with the DPDK ixgbevf PMD (uio). > I am trying to configure multiple (2 for now) receive queues on the VF = and use RSS. > I see packets coming only to queue 0 for some reason. Some questions ab= out this: >=20 > 1] I see that most of the initial configuration to make multi-queue + R= SS work is done in ixgbe_dev_mq_rx_configure() > [e.g. Setting up the redirect table and the MRQC register]. Howeve= r, only the non-VF ixgbe_dev_rx_init() calls the above function; > ixgbevf_dev_rx_init() doesn't configure RSS-related hardware. Don'= t we need to do this configuration to use RSS on a VF? > 2] Even after configuring the RSS-related hardware in ixgbevf PMD, pack= ets only come to queue 0. I printed out the RSS-type and RSS-hash-value > fields from the write back Rx descriptor and they are both set to = 0. So for some reason no RSS hash is being done for any packets. > 3] Has anyone seen this kind of configuration work (multi-queue + RSS += VF)? I have an X540 NIC but has this worked on any other NIC for anyone? > 4] Also any ideas on how to debug this problem further? >=20 > Thanks, > Anant RSS redirection of traffic in a VF is not supported by the hardware, so y= ou are pretty much stuck with all VF traffic going to queue 0. [Later hardware, = such as 4x10G NICs e.g. "Intel=AE Ethernet Converged Network Adapters XL710" usin= g the i40e driver should support RSS with VFs] /Bruce