linux-kernel - [PATCH v2 0/1] virtio_net: vdpa: update MAC address when it is generated by virtio-net

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Date:   Mon, 23 Jan 2023 13:00:21 +0100
From:   Laurent Vivier <lvivier@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Gautam Dawar <gautam.dawar@...inx.com>,
        Eugenio Pérez <eperezma@...hat.com>,
        netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        Eli Cohen <elic@...dia.com>, Cindy Lu <lulu@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Parav Pandit <parav@...dia.com>
Subject: [PATCH v2 0/1] 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
not provided by the device.

v2:
  - remove vdpa_sim related fixes
  - check virtio_has_feature(vdev, VIRTIO_NET_F_MAC) rather than
    addr_assign_type

Laurent Vivier (1):
  virtio_net: notify MAC address change on device initialization

 drivers/net/virtio_net.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

-- 
2.39.0