netdev - Re: [PATCH bpf-next 01/10] ice: introduce priv-flag for toggling loopback mode

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Date:   Fri, 10 Jun 2022 17:22:16 +0200
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        netdev@...r.kernel.org, magnus.karlsson@...el.com, bjorn@...nel.org
Subject: Re: [PATCH bpf-next 01/10] ice: introduce priv-flag for toggling loopback mode

From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
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@...el.com>
> ---
>  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