[PATCH V8] ethdev: fix one address occupies two entries in MAC addrs

[Thomas Monjalon]

02/02/2023 13:36, Huisong Li:
> The dev->data->mac_addrs[0] will be changed to a new MAC address when
> applications modify the default MAC address by .mac_addr_set(). However,
> if the new default one has been added as a non-default MAC address by
> .mac_addr_add(), the .mac_addr_set() doesn't remove it from the mac_addrs
> list. As a result, one MAC address occupies two entries in the list. Like:
> add(MAC1)
> add(MAC2)
> add(MAC3)
> add(MAC4)
> set_default(MAC3)
> default=MAC3, the rest of the list=MAC1, MAC2, MAC3, MAC4
> Note: MAC3 occupies two entries.
> 
> In addition, some PMDs, such as i40e, ice, hns3 and so on, do remove the
> old default MAC when set default MAC. If user continues to do
> set_default(MAC5), and the mac_addrs list is default=MAC5, filters=(MAC1,
> MAC2, MAC3, MAC4). At this moment, user can still see MAC3 from the list,
> but packets with MAC3 aren't actually received by the PMD.
> 
> So need to ensure that the new default address is removed from the rest of
> the list if the address was already in the list.
> 
> Fixes: 854d8ad4ef68 ("ethdev: add default mac address modifier")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Huisong Li <lihuisong at huawei.com>
> Acked-by: Chengwen Feng <fengchengwen at huawei.com>

Acked-by: Thomas Monjalon <thomas at monjalon.net>

Thank you