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Date: Thu, 27 Jul 2023 21:05:28 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Vladimir Oltean <olteanv@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Atin Bainada <hi@...nb.me>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH 2/3] net: dsa: qca8k: make learning configurable
and keep off if standalone
On Wed, Jul 26, 2023 at 03:12:13PM +0300, Vladimir Oltean wrote:
> On Mon, Jul 24, 2023 at 05:30:57AM +0200, Christian Marangi wrote:
> > Address learning should initially be turned off by the driver for port
> > operation in standalone mode, then the DSA core handles changes to it
> > via ds->ops->port_bridge_flags().
> >
> > Currently this is not the case for qca8k where learning is enabled
> > unconditionally in qca8k_setup for every user port.
> >
> > Handle ports configured in standalone mode by making the learning
> > configurable and not enabling it by default.
> >
> > Implement .port_pre_bridge_flags and .port_bridge_flags dsa ops to
> > enable learning for bridge that request it and tweak
> > .port_stp_state_set to correctly disable learning when port is
> > configured in standalone mode.
> >
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > ---
>
> Reviewed-by: Vladimir Oltean <olteanv@...il.com>
>
> Small nitpick below.
>
> > drivers/net/dsa/qca/qca8k-8xxx.c | 7 +++--
> > drivers/net/dsa/qca/qca8k-common.c | 44 ++++++++++++++++++++++++++++++
> > drivers/net/dsa/qca/qca8k.h | 6 ++++
> > 3 files changed, 54 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/dsa/qca/qca8k-8xxx.c b/drivers/net/dsa/qca/qca8k-8xxx.c
> > index ae088a4df794..31552853fdd4 100644
> > --- a/drivers/net/dsa/qca/qca8k-8xxx.c
> > +++ b/drivers/net/dsa/qca/qca8k-8xxx.c
> > @@ -1870,9 +1870,8 @@ qca8k_setup(struct dsa_switch *ds)
> > if (ret)
> > return ret;
> >
> > - /* Enable ARP Auto-learning by default */
> > - ret = regmap_set_bits(priv->regmap, QCA8K_PORT_LOOKUP_CTRL(i),
> > - QCA8K_PORT_LOOKUP_LEARN);
> > + ret = regmap_clear_bits(priv->regmap, QCA8K_PORT_LOOKUP_CTRL(i),
> > + QCA8K_PORT_LOOKUP_LEARN);
> > if (ret)
> > return ret;
> >
> > @@ -1978,6 +1977,8 @@ static const struct dsa_switch_ops qca8k_switch_ops = {
> > .port_change_mtu = qca8k_port_change_mtu,
> > .port_max_mtu = qca8k_port_max_mtu,
> > .port_stp_state_set = qca8k_port_stp_state_set,
> > + .port_pre_bridge_flags = qca8k_port_pre_bridge_flags,
> > + .port_bridge_flags = qca8k_port_bridge_flags,
> > .port_bridge_join = qca8k_port_bridge_join,
> > .port_bridge_leave = qca8k_port_bridge_leave,
> > .port_fast_age = qca8k_port_fast_age,
> > diff --git a/drivers/net/dsa/qca/qca8k-common.c b/drivers/net/dsa/qca/qca8k-common.c
> > index 13b8452ce5b2..e53694d2852a 100644
> > --- a/drivers/net/dsa/qca/qca8k-common.c
> > +++ b/drivers/net/dsa/qca/qca8k-common.c
> > @@ -565,9 +565,26 @@ int qca8k_get_mac_eee(struct dsa_switch *ds, int port,
> > return 0;
> > }
> >
> > +static int qca8k_port_configure_learning(struct dsa_switch *ds, int port,
> > + bool learning)
> > +{
> > + struct qca8k_priv *priv = ds->priv;
> > +
> > + if (learning)
> > + return regmap_set_bits(priv->regmap,
> > + QCA8K_PORT_LOOKUP_CTRL(port),
> > + QCA8K_PORT_LOOKUP_LEARN);
> > + else
> > + return regmap_clear_bits(priv->regmap,
> > + QCA8K_PORT_LOOKUP_CTRL(port),
> > + QCA8K_PORT_LOOKUP_LEARN);
> > +}
> > +
> > void qca8k_port_stp_state_set(struct dsa_switch *ds, int port, u8 state)
> > {
> > + struct dsa_port *dp = dsa_to_port(ds, port);
> > struct qca8k_priv *priv = ds->priv;
> > + bool learning = false;
> > u32 stp_state;
> >
> > switch (state) {
> > @@ -582,8 +599,11 @@ void qca8k_port_stp_state_set(struct dsa_switch *ds, int port, u8 state)
> > break;
> > case BR_STATE_LEARNING:
> > stp_state = QCA8K_PORT_LOOKUP_STATE_LEARNING;
> > + learning = dp->learning;
> > break;
> > case BR_STATE_FORWARDING:
> > + learning = dp->learning;
> > + fallthrough;
> > default:
> > stp_state = QCA8K_PORT_LOOKUP_STATE_FORWARD;
> > break;
> > @@ -591,6 +611,30 @@ void qca8k_port_stp_state_set(struct dsa_switch *ds, int port, u8 state)
> >
> > qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(port),
> > QCA8K_PORT_LOOKUP_STATE_MASK, stp_state);
> > +
> > + qca8k_port_configure_learning(ds, port, learning);
> > +}
> > +
> > +int qca8k_port_pre_bridge_flags(struct dsa_switch *ds, int port,
> > + struct switchdev_brport_flags flags,
> > + struct netlink_ext_ack *extack)
> > +{
> > + if (flags.mask & ~BR_LEARNING)
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
> > +
> > +int qca8k_port_bridge_flags(struct dsa_switch *ds, int port,
> > + struct switchdev_brport_flags flags,
> > + struct netlink_ext_ack *extack)
> > +{
> > + int ret;
> > +
> > + ret = qca8k_port_configure_learning(ds, port,
> > + flags.val & BR_LEARNING);
> > +
> > + return ret;
>
> I worry that the way in this is formulated will attract patches from
> kernel janitors to simplify it to:
>
> return qca8k_port_configure_learning(...)
>
> I agree that it's not strictly necessary to check flags.mask when
> port_pre_bridge_flags supports a single flag, but if you did that and
> structured the code for more future flags, you could avoid that.
>
> int ret;
>
> if (flags.mask & BR_LEARNING) {
> ret = qca8k_port_configure_learning(...,
> flags.val & BR_LEARNING);
> if (ret)
> return ret;
> }
>
> return 0;
>
> Anyway, probably not a big deal.
>
> > }
I hope and expect to send fbd isolation later with FLOOD flags so I will
send v2 of this with the suggested format.
> >
> > int qca8k_port_bridge_join(struct dsa_switch *ds, int port,
> > diff --git a/drivers/net/dsa/qca/qca8k.h b/drivers/net/dsa/qca/qca8k.h
> > index c5cc8a172d65..8f88b7db384d 100644
> > --- a/drivers/net/dsa/qca/qca8k.h
> > +++ b/drivers/net/dsa/qca/qca8k.h
> > @@ -522,6 +522,12 @@ int qca8k_get_mac_eee(struct dsa_switch *ds, int port, struct ethtool_eee *e);
> >
> > /* Common bridge function */
> > void qca8k_port_stp_state_set(struct dsa_switch *ds, int port, u8 state);
> > +int qca8k_port_pre_bridge_flags(struct dsa_switch *ds, int port,
> > + struct switchdev_brport_flags flags,
> > + struct netlink_ext_ack *extack);
> > +int qca8k_port_bridge_flags(struct dsa_switch *ds, int port,
> > + struct switchdev_brport_flags flags,
> > + struct netlink_ext_ack *extack);
> > int qca8k_port_bridge_join(struct dsa_switch *ds, int port,
> > struct dsa_bridge bridge,
> > bool *tx_fwd_offload,
> > --
> > 2.40.1
> >
>
--
Ansuel
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