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Date: Wed, 15 Jun 2022 12:38:04 +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: [PATCH v2 bpf-next 01/10] ice: allow toggling loopback mode via ndo_set_features callback
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Date: Tue, 14 Jun 2022 19:47:40 +0200
> Add support for NETIF_F_LOOPBACK. Also, simplify checks throughout whole
> ice_set_features().
>
> CC: Alexandr Lobakin <alexandr.lobakin@...el.com>
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> ---
> drivers/net/ethernet/intel/ice/ice_main.c | 54 ++++++++++++++---------
> 1 file changed, 34 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
> index e1cae253412c..ab00b0361e87 100644
> --- a/drivers/net/ethernet/intel/ice/ice_main.c
> +++ b/drivers/net/ethernet/intel/ice/ice_main.c
> @@ -3358,6 +3358,7 @@ static void ice_set_netdev_features(struct net_device *netdev)
> netdev->features |= netdev->hw_features;
>
> netdev->hw_features |= NETIF_F_HW_TC;
> + netdev->hw_features |= NETIF_F_LOOPBACK;
>
> /* encap and VLAN devices inherit default, csumo and tso features */
> netdev->hw_enc_features |= dflt_features | csumo_features |
> @@ -5902,6 +5903,18 @@ ice_set_vlan_features(struct net_device *netdev, netdev_features_t features)
> return 0;
> }
>
> +static void ice_set_loopback(struct ice_pf *pf, struct net_device *netdev, bool ena)
I feel like the first argument is redundant in here since we can do
const struct ice_netdev_priv *np = netdev_priv(netdev);
struct ice_pf *pf = np->vsi->back;
But at the same time one function argument can be cheaper than two
jumps, so up to you.
> +{
> + bool if_running = netif_running(netdev);
> +
> + if (if_running)
> + ice_stop(netdev);
> + if (ice_aq_set_mac_loopback(&pf->hw, ena, NULL))
> + dev_err(ice_pf_to_dev(pf), "Failed to toggle loopback state\n");
netdev_err() instead probably? I guess dev_err() is used for
consistency with the rest of ice_set_features(), but I'd recommend
using the former anyways.
> + if (if_running)
> + ice_open(netdev);
> +}
> +
> /**
> * ice_set_features - set the netdev feature flags
> * @netdev: ptr to the netdev being adjusted
> @@ -5910,6 +5923,7 @@ ice_set_vlan_features(struct net_device *netdev, netdev_features_t features)
> static int
> ice_set_features(struct net_device *netdev, netdev_features_t features)
> {
> + netdev_features_t changed = netdev->features ^ features;
> struct ice_netdev_priv *np = netdev_priv(netdev);
> struct ice_vsi *vsi = np->vsi;
> struct ice_pf *pf = vsi->back;
> @@ -5917,37 +5931,33 @@ ice_set_features(struct net_device *netdev, netdev_features_t features)
>
> /* Don't set any netdev advanced features with device in Safe Mode */
> if (ice_is_safe_mode(vsi->back)) {
> - dev_err(ice_pf_to_dev(vsi->back), "Device is in Safe Mode - not enabling advanced netdev features\n");
> + dev_err(ice_pf_to_dev(vsi->back),
> + "Device is in Safe Mode - not enabling advanced netdev features\n");
This (I mean the whole ice_set_features() cleanup) deserves to be in
a separate patch to me. In can be a past of this series for sure.
> return ret;
> }
>
> /* Do not change setting during reset */
> if (ice_is_reset_in_progress(pf->state)) {
> - dev_err(ice_pf_to_dev(vsi->back), "Device is resetting, changing advanced netdev features temporarily unavailable.\n");
> + dev_err(ice_pf_to_dev(vsi->back),
> + "Device is resetting, changing advanced netdev features temporarily unavailable.\n");
> return -EBUSY;
> }
>
> /* Multiple features can be changed in one call so keep features in
> * separate if/else statements to guarantee each feature is checked
> */
> - if (features & NETIF_F_RXHASH && !(netdev->features & NETIF_F_RXHASH))
> - ice_vsi_manage_rss_lut(vsi, true);
> - else if (!(features & NETIF_F_RXHASH) &&
> - netdev->features & NETIF_F_RXHASH)
> - ice_vsi_manage_rss_lut(vsi, false);
> + if (changed & NETIF_F_RXHASH)
> + ice_vsi_manage_rss_lut(vsi, !!(features & NETIF_F_RXHASH));
>
> ret = ice_set_vlan_features(netdev, features);
> if (ret)
> return ret;
>
> - if ((features & NETIF_F_NTUPLE) &&
> - !(netdev->features & NETIF_F_NTUPLE)) {
> - ice_vsi_manage_fdir(vsi, true);
> - ice_init_arfs(vsi);
> - } else if (!(features & NETIF_F_NTUPLE) &&
> - (netdev->features & NETIF_F_NTUPLE)) {
> - ice_vsi_manage_fdir(vsi, false);
> - ice_clear_arfs(vsi);
> + if (changed & NETIF_F_NTUPLE) {
> + bool ena = !!(features & NETIF_F_NTUPLE);
> +
> + ice_vsi_manage_fdir(vsi, ena);
> + ena ? ice_init_arfs(vsi) : ice_clear_arfs(vsi);
> }
>
> /* don't turn off hw_tc_offload when ADQ is already enabled */
> @@ -5956,11 +5966,15 @@ ice_set_features(struct net_device *netdev, netdev_features_t features)
> return -EACCES;
> }
>
> - if ((features & NETIF_F_HW_TC) &&
> - !(netdev->features & NETIF_F_HW_TC))
> - set_bit(ICE_FLAG_CLS_FLOWER, pf->flags);
> - else
> - clear_bit(ICE_FLAG_CLS_FLOWER, pf->flags);
> + if (changed & NETIF_F_HW_TC) {
> + bool ena = !!(features & NETIF_F_HW_TC);
> +
> + ena ? set_bit(ICE_FLAG_CLS_FLOWER, pf->flags) :
> + clear_bit(ICE_FLAG_CLS_FLOWER, pf->flags);
> + }
> +
> + if (changed & NETIF_F_LOOPBACK)
> + ice_set_loopback(pf, netdev, !!(features & NETIF_F_LOOPBACK));
>
> return 0;
> }
> --
> 2.27.0
The rest is good, I like wiring up standard interfaces with the
existing hardware functionality :) Loopback mode is useful for
testing stuff.
Thanks!
Olek
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