From: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
Date: Fri, 10 Jun 2022 17:09:14 +0200
> Add a knob that will allow user to turn the underlying net device into
> loopback mode. The use case for this will be the AF_XDP ZC tests. Once
> the device is in loopback mode, then it will be possible from AF_XDP
> perspective to see if zero copy implementations in drivers work
> properly.
>
> The code for interaction with admin queue is reused from ethtool's
> loopback test.
>
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
> ---
> drivers/net/ethernet/intel/ice/ice.h | 1 +
> drivers/net/ethernet/intel/ice/ice_ethtool.c | 17 +++++++++++++++++
> 2 files changed, 18 insertions(+)
>
> diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
> index 60453b3b8d23..90c066f3782b 100644
> --- a/drivers/net/ethernet/intel/ice/ice.h
> +++ b/drivers/net/ethernet/intel/ice/ice.h
> @@ -487,6 +487,7 @@ enum ice_pf_flags {
> ICE_FLAG_PLUG_AUX_DEV,
> ICE_FLAG_MTU_CHANGED,
> ICE_FLAG_GNSS, /* GNSS successfully initialized */
> + ICE_FLAG_LOOPBACK,
I'do for %NETIF_F_LOOPBACK, should work in here, too :)
> ICE_PF_FLAGS_NBITS /* must be last */
> };
>
> diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
> index 1e71b70f0e52..cfc3c5e36907 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
> @@ -166,6 +166,7 @@ static const struct ice_priv_flag ice_gstrings_priv_flags[] = {
> ICE_PRIV_FLAG("mdd-auto-reset-vf", ICE_FLAG_MDD_AUTO_RESET_VF),
> ICE_PRIV_FLAG("vf-vlan-pruning", ICE_FLAG_VF_VLAN_PRUNING),
> ICE_PRIV_FLAG("legacy-rx", ICE_FLAG_LEGACY_RX),
> + ICE_PRIV_FLAG("loopback", ICE_FLAG_LOOPBACK),
> };
>
> #define ICE_PRIV_FLAG_ARRAY_SIZE ARRAY_SIZE(ice_gstrings_priv_flags)
> @@ -1288,6 +1289,22 @@ static int ice_set_priv_flags(struct net_device *netdev, u32 flags)
> ice_up(vsi);
> }
> }
> +
> + if (test_bit(ICE_FLAG_LOOPBACK, change_flags)) {
> + if (!test_bit(ICE_FLAG_LOOPBACK, orig_flags)) {
> + /* Enable MAC loopback in firmware */
> + if (ice_aq_set_mac_loopback(&pf->hw, true, NULL)) {
> + dev_err(dev, "Failed to enable loopback\n");
> + ret = -ENXIO;
> + }
> + } else {
> + /* Disable MAC loopback in firmware */
> + if (ice_aq_set_mac_loopback(&pf->hw, false, NULL)) {
> + dev_err(dev, "Failed to disable loopback\n");
> + ret = -ENXIO;
> + }
> + }
> + }
> /* don't allow modification of this flag when a single VF is in
> * promiscuous mode because it's not supported
> */
> --
> 2.27.0
Thanks,
Olek
