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Subject[PATCH 0/4] virtio_net: vdpa: update MAC address when it is generated by virtio-net
When the MAC address is not provided by the vdpa device virtio_net
driver assigns a random one without notifying the device.
The consequence, in the case of mlx5_vdpa, is the internal routing
tables of the device are not updated and this can block the
communication between two namespaces.

To fix this problem, use virtnet_send_command(VIRTIO_NET_CTRL_MAC)
to set the address from virtnet_probe() when the MAC address is
randomly assigned from virtio_net.

While I was testing this change I found 3 other bugs in vdpa_sim_net:

- vdpa_sim_net sets the VIRTIO_NET_F_MAC even if no MAC address is
provided. So virtio_net doesn't generate a random MAC address and
the MAC address appears to be 00:00:00:00:00:00

- vdpa_sim_net never processes the command and virtnet_send_command()
hangs in an infinite loop. To avoid a kernel crash add a timeout
in the loop.

- To allow vdpa_sim_net to process the command, replace the cpu_relax()
in the loop by a schedule(). vdpa_sim_net uses a workqueue to process
the queue, and if we don't allow the kernel to schedule, the queue
is not processed and the loop is infinite.

Laurent Vivier (4):
virtio_net: notify MAC address change on device initialization
virtio_net: add a timeout in virtnet_send_command()
vdpa_sim_net: don't always set VIRTIO_NET_F_MAC
virtio_net: fix virtnet_send_command() with vdpa_sim_net

drivers/net/virtio_net.c | 21 +++++++++++++++++++--
drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 6 ++++++
2 files changed, 25 insertions(+), 2 deletions(-)


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