Maciej Fijalkowski wrote:
> Add support for NETIF_F_LOOPBACK. This feature can be set via:
> $ ethtool -K eth0 loopback <on|off>
>
> Feature can be useful for local data path tests.
>
> CC: Alexandr Lobakin <alexandr.lobakin@xxxxxxxxx>
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
> ---
Patch looks fine one question about that ice_set_features() function
though.
Acked-by: John Fastabend <john.fastabend@xxxxxxxxx>
[...]
> +/**
> + * ice_set_loopback - turn on/off loopback mode on underlying PF
> + * @vsi: ptr to VSI
> + * @ena: flag to indicate the on/off setting
> + */
> +static int
> +ice_set_loopback(struct ice_vsi *vsi, bool ena)
> +{
> + bool if_running = netif_running(vsi->netdev);
> + int ret;
> +
> + if (if_running && !test_and_set_bit(ICE_VSI_DOWN, vsi->state)) {
> + ret = ice_down(vsi);
> + if (ret) {
> + netdev_err(vsi->netdev, "Preparing device to toggle loopback failed\n");
> + return ret;
> + }
> + }
> + ret = ice_aq_set_mac_loopback(&vsi->back->hw, ena, NULL);
> + if (ret)
> + netdev_err(vsi->netdev, "Failed to toggle loopback state\n");
> + if (if_running)
> + ret = ice_up(vsi);
> +
> + return ret;
> +}
> +
> /**
> * ice_set_features - set the netdev feature flags
> * @netdev: ptr to the netdev being adjusted
> @@ -5960,7 +5988,10 @@ ice_set_features(struct net_device *netdev, netdev_features_t features)
> clear_bit(ICE_FLAG_CLS_FLOWER, pf->flags);
> }
>
> - return 0;
> + if (changed & NETIF_F_LOOPBACK)
> + ret = ice_set_loopback(vsi, !!(features & NETIF_F_LOOPBACK));
> +
> + return ret;
Unrelated to your patch, but because you are messing with 'ret' here a bit,
how come you return 0 when ice_is_safe_mode() shouldn't you push that
error up so the user who is doing the setting knows it didn't actually
work?
> }
>
> /**
> --
> 2.27.0
>
