On Wed, Dec 22, 2021 at 11:35:44AM +0800, Cheng Xu wrote:

<...>

quoted

quoted

For the ECS instance with RDMA enabled, there are two kinds of devices
allocated, one for ERDMA, and one for the original netdev (virtio-net).
They are different PCI deivces. ERDMA driver can get the information about
which netdev attached to in its PCIe barspace (by MAC address matching).

This is very questionable. The netdev part should be kept in the
drivers/ethernet/... part of the kernel.

Thanks

The net device used in Alibaba ECS instance is virtio-net device, driven
by virtio-pci/virtio-net drivers. ERDMA device does not need its own net
device, and will be attached to an existed virtio-net device. The
relationship between ibdev and netdev in erdma is similar to siw/rxe.

siw/rxe binds through RDMA_NLDEV_CMD_NEWLINK netlink command and not
through MAC's matching.

Thanks