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Message-ID: <YqnmTUpTgquVOsP5@boxer>
Date: Wed, 15 Jun 2022 16:01:49 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Alexander Lobakin <alexandr.lobakin@...el.com>
Cc: bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
netdev@...r.kernel.org, magnus.karlsson@...el.com, bjorn@...nel.org
Subject: Re: [PATCH v2 bpf-next 01/10] ice: allow toggling loopback mode via
ndo_set_features callback
On Wed, Jun 15, 2022 at 12:38:04PM +0200, Alexander Lobakin wrote:
> 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.
So let's use netdev_err and drop the pf from arguments that are passed
>
> > + 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.
ack, will pull out this to a standalone patch followed by loopback
enablement
>
> > 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 for review!
>
> Thanks!
> Olek
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