[dpdk-stable] [dpdk-dev] [PATCH] ethdev: fix setting of MAC address
Andrew Rybchenko
arybchenko at solarflare.com
Mon Dec 18 11:35:52 CET 2017
On 12/14/2017 08:15 PM, Olivier Matz wrote:
> From: Laurent Hardy <laurent.hardy at 6wind.com>
>
> When a new mac address is set, it is saved in dev->data->mac_addrs
> before the ethdev handler is called.
>
> First, it is inconsistent with the other ethdev functions
> rte_eth_dev_mac_addr_remove() and rte_eth_dev_mac_addr_add().
>
> Moreover, it prevents the drivers from wrongly comparing the old address
> and the new one, like it's done in i40evf driver:
>
> if (is_same_ether_addr(mac_addr, dev->data->mac_addrs))
> return;
>
> Fixes: 943c2d899a0c ("net/i40e: set VF MAC from VF")
> Fixes: 854d8ad4ef68 ("ethdev: add default mac address modifier")
> Cc: stable at dpdk.org
>
> Signed-off-by: Laurent Hardy <laurent.hardy at 6wind.com>
> ---
> lib/librte_ether/rte_ethdev.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
> index 4f492e3db..297c02a54 100644
> --- a/lib/librte_ether/rte_ethdev.c
> +++ b/lib/librte_ether/rte_ethdev.c
> @@ -2643,11 +2643,11 @@ rte_eth_dev_default_mac_addr_set(uint16_t port_id, struct ether_addr *addr)
> dev = &rte_eth_devices[port_id];
> RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->mac_addr_set, -ENOTSUP);
>
> + (*dev->dev_ops->mac_addr_set)(dev, addr);
> +
> /* Update default address in NIC data structure */
> ether_addr_copy(addr, &dev->data->mac_addrs[0]);
>
> - (*dev->dev_ops->mac_addr_set)(dev, addr);
> -
> return 0;
> }
NACK, unfortunately it will break net/sfc in one of branches when a new MAC
is set using restart. It relies on the fact that a new MAC is already
available in
device data.
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