Hi Jason, Also i would like to add another issue, that is location of 'net' sysfs inside PCI devices sysfs. Libvirt also expects to find folder '/sys/bus/pci/devices/<PF addr>/net' to get corresponding network interface. However, for virtio-net managed devices, the 'net' folder is located in virtioX folder, i.e. '/sys/bus/pci/devices/<PF addr>/virtioX/net'.
AFAIK it is due to how sysfs works and usage of virtual bus in virtio driver implementation, or am i wrong? Is there any way to create somehow some symlink e.g. for this case, so libvirt finds it? Regarding the ndo_* SRIOV callbacks, a proper implementation would actually need to tell the PF the VF config somehow. How would virtio-net do that? Wouldn't that need extending virtio specification? Or is it worked on for virtio 1.2? (AFAIK it isn't released yet) Thanks and regards, AK On Wed, Apr 28, 2021 at 3:33 PM Walukiewicz, Miroslaw < [email protected]> wrote: > HI Jason, > > You are right here. We did not catch your change in driver and the SRIOV > flag is set correctly as you stated. > > We want to orchestrate the HW implementation of VFs and PFs for virtio-net > using libvirt. > > The issue that we want to resolve is that there is no .ndo_get_vf_config > Callback implemented in virtio-net driver as other NIC's drivers have, > called by libvirt. > See > https://github.com/torvalds/linux/blob/master/drivers/net/ethernet/intel/igb/igb_main.c#L2996, > for example > This callback really should create a minimal configuration inside of > driver, but we cannot avoid it. > > Another issue is lack of sysfs fro virtual functions > /sys/class/net/ens801f0/device/virtfnX (where X is VF number and ens801fo > is its PF netdev), > > Could you advise us, how we can solve our issue and drive us to proper > solution? > > Regards, > > Mirek > -----Original Message----- > From: Jason Wang <[email protected]> > Sent: wtorek, 27 kwietnia 2021 04:44 > To: Arkadiusz Kudan <[email protected]>; > [email protected] > Cc: [email protected]; [email protected]; Walukiewicz, Miroslaw < > [email protected]> > Subject: Re: [PATCH] virtio-net: enable SRIOV > > > 在 2021/4/26 下午6:21, Arkadiusz Kudan 写道: > > With increasing interest for virtio, NIC have appeared that provide > > SRIOV with PF appearing in the host as a virtio network device and > > probably more similiar NICs will emerge. > > igb_uio of DPDK or pci-pf-stub can be used to provide SRIOV, however > > there are hypervisors/VMMs that require VFs, which are to be PCI > > passthrued to a VM, to have its PF with network representation in the > > kernel. For virtio-net based PFs, virtio-net could do that by > > providing both SRIOV interface and netdev representation. > > > > Enable SRIOV via VIRTIO_F_SR_IOV feature bit if the device supports > > it. > > > > Signed-off-by: Arkadiusz Kudan <[email protected]> > > Signed-off-by: Miroslaw Walukiewicz <[email protected]> > > --- > > drivers/net/virtio_net.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index > > 0824e6999e49..a03aa7e99689 100644 > > --- a/drivers/net/virtio_net.c > > +++ b/drivers/net/virtio_net.c > > @@ -3249,6 +3249,7 @@ static struct virtio_device_id id_table[] = { > > > > static unsigned int features[] = { > > VIRTNET_FEATURES, > > + VIRTIO_F_SR_IOV, > > }; > > > So I'm suprised that it needs to be enabled per device. We had: > > static void vp_transport_features(struct virtio_device *vdev, u64 > features) { > struct virtio_pci_device *vp_dev = to_vp_device(vdev); > struct pci_dev *pci_dev = vp_dev->pci_dev; > > if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) && > pci_find_ext_capability(pci_dev, > PCI_EXT_CAP_ID_SRIOV)) > __virtio_set_bit(vdev, VIRTIO_F_SR_IOV); } > > And I had used this driver for SRIOV virtio-pci hardware for more than one > year. > > Thanks > > > > > > static unsigned int features_legacy[] = { > > -- Arkadiusz Kudan Software Engineer [email protected] [image: Logo Codilime] <http://www.codilime.com/?utm_source=Stopka&utm_medium=Email&utm_campaign=Stopka> [image: Logo Facebook] <https://www.facebook.com/codilime/> [image: Logo Linkedin] <https://www.linkedin.com/company/codilime> [image: Logo Twitter] <https://twitter.com/codilime> CodiLime Sp. z o.o. - Ltd. company with its registered office in Poland, 02-493 Warsaw, ul. Krancowa 5. Registered by The District Court for the Capital City of Warsaw, XII Commercial Department of the National Court Register. Entered into National Court Register under No. KRS 0000388871. Tax identification number (NIP) 5272657478. Statistical number (REGON) 142974628. -- ------------------------------- This document contains material that is confidential in CodiLime Sp. z o.o. DO NOT PRINT. DO NOT COPY. DO NOT DISTRIBUTE. If you are not the intended recipient of this document, be aware that any use, review, retransmission, distribution, reproduction or any action taken in reliance upon this message is strictly prohibited. If you received this in error, please contact the sender and [email protected] <mailto:[email protected]>. Return the paper copy, delete the material from all computers and storage media.
_______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
