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Date: Wed, 26 Jul 2023 15:12:13 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: Christian Marangi <ansuelsmth@...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 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.
> }
>
> 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
>
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