On Wed, 12 Jun 2019 05:15:47 +0000 Matan Azrad <ma...@mellanox.com> wrote:
> From: Stephen Hemminger > > > Hi Stephen > > > > > > From: Stephen Hemminger > > > > When using DPDK on Azure it is common to have one non-DPDK > > interface. > > > > If that non-DPDK interface is present vdev_netvsc correctly skip it. > > > > But if the non-DPDK has accelerated networking the Mellanox driver > > > > will still get associated with DPDK (and break connectivity). > > > > > > > > The current process is to tell users to do whitelist or blacklist > > > > the PCI > > > > device(s) not used for DPDK. But vdev_netvsc already is doing a lot > > > > of looking at devices and VF devices. > > > > > > > > Could vdev_netvsc just do this automatically by setting devargs for > > > > the VF to blacklist? > > > > > > > > > There is way to blacklist a device by setting it a rout\IP\IPv6, from the > > > > > VDEV_NETVSC doc: > > > "Not specifying either iface or mac makes this driver attach itself to > > > all > > unrouted NetVSC interfaces found on the system. Specifying the device > > makes this driver attach itself to the device regardless the device > > routes." > > > > > > So, we are expecting that used VFs will be with a rout and DPDK VFs will > > > not > > be with a rout. > > > > > > Doesn't it enough? > > > > > > > > > Matan > > > > I am talking about if eth0 has a route, it gets skipped but the associated > > MLX > > SR-IOV device does not. When the MLX device is then configured for DPDK, it > > breaks it for use by kernel; and therefore connectivity with the VM is > > lost. > > Ok, I think I got you. > You want to blacklist the PCI device which its netvsc net-device is detected > as routed. Do you? > > If so, > > I don't think that probing the pci device hurts the connectivity, only the > configuration should hurt it. > > It means that the application configures the device and hurt it. > Doesn't it an application issue? > > Matan Actually probing does hurt, it corrupts the MLX driver. In theory, the driver supports bifurcated but in practice it is greedy and grabs all flows.
