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SubjectRe: [PATCH net-next v2 13/14] sfc: update vdpa device MAC address
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On 3/10/23 10:35, Jason Wang wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>
>
> On Tue, Mar 7, 2023 at 7:38 PM Gautam Dawar <gautam.dawar@amd.com> wrote:
>> As the VF MAC address can now be updated using `devlink port function set`
> What happens if we run this while the vpda is being used by a VM?
IIUC, updating the MAC address using devlink interface requires
unbinding the device from driver and hence updating the MAC while vdpa
device is in-use won't be possible. It can only be done via control vq
VIRTIO_NET_CTRL_MAC_ADDR_SET command, when available.
>
>> interface, fetch the vdpa device MAC address from the underlying VF during
>> vdpa device creation.
>>
>> Signed-off-by: Gautam Dawar <gautam.dawar@amd.com>
>> ---
>> drivers/net/ethernet/sfc/ef100_vdpa.c | 12 ++++++++++++
>> 1 file changed, 12 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.c b/drivers/net/ethernet/sfc/ef100_vdpa.c
>> index 30ca4ab00175..32182a01f6a5 100644
>> --- a/drivers/net/ethernet/sfc/ef100_vdpa.c
>> +++ b/drivers/net/ethernet/sfc/ef100_vdpa.c
>> @@ -272,6 +272,18 @@ static int get_net_config(struct ef100_vdpa_nic *vdpa_nic)
>> vdpa_nic->net_config.max_virtqueue_pairs =
>> cpu_to_efx_vdpa16(vdpa_nic, vdpa_nic->max_queue_pairs);
>>
>> + rc = ef100_get_mac_address(efx, vdpa_nic->mac_address,
>> + efx->client_id, true);
>> + if (rc) {
>> + dev_err(&vdpa_nic->vdpa_dev.dev,
>> + "%s: Get MAC for vf:%u failed:%d\n", __func__,
>> + vdpa_nic->vf_index, rc);
>> + return rc;
>> + }
> Can this override what is provisioned by the userspace?

No, this was carefully avoided by overwriting the userspace provisioned
MAC in ef100_vdpa_create():

        rc = get_net_config(vdpa_nic);
        if (rc)
                goto err_put_device;

        if (mac) {
                ether_addr_copy(vdpa_nic->mac_address, mac);
                vdpa_nic->mac_configured = true;
        }

>
> Thanks
>
>
>> +
>> + if (is_valid_ether_addr(vdpa_nic->mac_address))
>> + vdpa_nic->mac_configured = true;
>> +
>> rc = efx_vdpa_get_mtu(efx, &mtu);
>> if (rc) {
>> dev_err(&vdpa_nic->vdpa_dev.dev,
>> --
>> 2.30.1
>>

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