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Date: Tue, 18 Jun 2024 15:16:26 +0200
From: Wojciech Drewek <wojciech.drewek@...el.com>
To: Matthias Schiffer <mschiffer@...verse-factory.net>,
Arınç ÜNAL <arinc.unal@...nc9.com>, Daniel Golle
<daniel@...rotopia.org>, DENG Qingfang <dqfext@...il.com>, Sean Wang
<sean.wang@...iatek.com>
CC: Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>,
Vladimir Oltean <olteanv@...il.com>, "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, "Paolo
Abeni" <pabeni@...hat.com>, Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH net-next v3 1/2] net: dsa: mt7530: factor out bridge
join/leave logic
On 18.06.2024 09:17, Matthias Schiffer wrote:
> As preparation for implementing bridge port isolation, move the logic to
> add and remove bits in the port matrix into a new helper
> mt7530_update_port_member(), which is called from
> mt7530_port_bridge_join() and mt7530_port_bridge_leave().
>
> Another part of the preparation is using dsa_port_offloads_bridge_dev()
> instead of dsa_port_offloads_bridge() to check for bridge membership, as
> we don't have a struct dsa_bridge in mt7530_port_bridge_flags().
>
> The port matrix setting is slightly streamlined, now always first setting
> the mt7530_port's pm field and then writing the port matrix from that
> field into the hardware register, instead of duplicating the bit
> manipulation for both the struct field and the register.
>
> mt7530_port_bridge_join() was previously using |= to update the port
> matrix with the port bitmap, which was unnecessary, as pm would only
> have the CPU port set before joining a bridge; a simple assignment can
> be used for both joining and leaving (and will also work when individual
> bits are added/removed in port_bitmap with regard to the previous port
> matrix, which is what happens with port isolation).
>
> No functional change intended.
>
> Signed-off-by: Matthias Schiffer <mschiffer@...verse-factory.net>
> ---
Nice cleanup :)
Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
>
> v2: no changes
> v3: addressed overlooked review comments:
> - Ran clang-format on the patch
> - Restored code comment
> - Extended commit message
>
> Thanks for the clang-format pointer - last time I tried that on kernel
> code (years ago), it was rather underwhelming, but it seems it has
> improved a lot.
>
> drivers/net/dsa/mt7530.c | 105 ++++++++++++++++++---------------------
> 1 file changed, 48 insertions(+), 57 deletions(-)
>
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index 598434d8d6e4..9ce27ce07d77 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -1302,6 +1302,52 @@ mt7530_stp_state_set(struct dsa_switch *ds, int port, u8 state)
> FID_PST(FID_BRIDGED, stp_state));
> }
>
> +static void mt7530_update_port_member(struct mt7530_priv *priv, int port,
> + const struct net_device *bridge_dev,
> + bool join) __must_hold(&priv->reg_mutex)
> +{
> + struct dsa_port *dp = dsa_to_port(priv->ds, port), *other_dp;
> + struct mt7530_port *p = &priv->ports[port], *other_p;
> + struct dsa_port *cpu_dp = dp->cpu_dp;
> + u32 port_bitmap = BIT(cpu_dp->index);
> + int other_port;
> +
> + dsa_switch_for_each_user_port(other_dp, priv->ds) {
> + other_port = other_dp->index;
> + other_p = &priv->ports[other_port];
> +
> + if (dp == other_dp)
> + continue;
> +
> + /* Add/remove this port to/from the port matrix of the other
> + * ports in the same bridge. If the port is disabled, port
> + * matrix is kept and not being setup until the port becomes
> + * enabled.
> + */
> + if (!dsa_port_offloads_bridge_dev(other_dp, bridge_dev))
> + continue;
> +
> + if (join) {
> + other_p->pm |= PCR_MATRIX(BIT(port));
> + port_bitmap |= BIT(other_port);
> + } else {
> + other_p->pm &= ~PCR_MATRIX(BIT(port));
> + }
> +
> + if (other_p->enable)
> + mt7530_rmw(priv, MT7530_PCR_P(other_port),
> + PCR_MATRIX_MASK, other_p->pm);
> + }
> +
> + /* Add/remove the all other ports to this port matrix. For !join
> + * (leaving the bridge), only the CPU port will remain in the port matrix
> + * of this port.
> + */
> + p->pm = PCR_MATRIX(port_bitmap);
> + if (priv->ports[port].enable)
> + mt7530_rmw(priv, MT7530_PCR_P(port), PCR_MATRIX_MASK, p->pm);
> +}
> +
> static int
> mt7530_port_pre_bridge_flags(struct dsa_switch *ds, int port,
> struct switchdev_brport_flags flags,
> @@ -1345,39 +1391,11 @@ mt7530_port_bridge_join(struct dsa_switch *ds, int port,
> struct dsa_bridge bridge, bool *tx_fwd_offload,
> struct netlink_ext_ack *extack)
> {
> - struct dsa_port *dp = dsa_to_port(ds, port), *other_dp;
> - struct dsa_port *cpu_dp = dp->cpu_dp;
> - u32 port_bitmap = BIT(cpu_dp->index);
> struct mt7530_priv *priv = ds->priv;
>
> mutex_lock(&priv->reg_mutex);
>
> - dsa_switch_for_each_user_port(other_dp, ds) {
> - int other_port = other_dp->index;
> -
> - if (dp == other_dp)
> - continue;
> -
> - /* Add this port to the port matrix of the other ports in the
> - * same bridge. If the port is disabled, port matrix is kept
> - * and not being setup until the port becomes enabled.
> - */
> - if (!dsa_port_offloads_bridge(other_dp, &bridge))
> - continue;
> -
> - if (priv->ports[other_port].enable)
> - mt7530_set(priv, MT7530_PCR_P(other_port),
> - PCR_MATRIX(BIT(port)));
> - priv->ports[other_port].pm |= PCR_MATRIX(BIT(port));
> -
> - port_bitmap |= BIT(other_port);
> - }
> -
> - /* Add the all other ports to this port matrix. */
> - if (priv->ports[port].enable)
> - mt7530_rmw(priv, MT7530_PCR_P(port),
> - PCR_MATRIX_MASK, PCR_MATRIX(port_bitmap));
> - priv->ports[port].pm |= PCR_MATRIX(port_bitmap);
> + mt7530_update_port_member(priv, port, bridge.dev, true);
>
> /* Set to fallback mode for independent VLAN learning */
> mt7530_rmw(priv, MT7530_PCR_P(port), PCR_PORT_VLAN_MASK,
> @@ -1478,38 +1496,11 @@ static void
> mt7530_port_bridge_leave(struct dsa_switch *ds, int port,
> struct dsa_bridge bridge)
> {
> - struct dsa_port *dp = dsa_to_port(ds, port), *other_dp;
> - struct dsa_port *cpu_dp = dp->cpu_dp;
> struct mt7530_priv *priv = ds->priv;
>
> mutex_lock(&priv->reg_mutex);
>
> - dsa_switch_for_each_user_port(other_dp, ds) {
> - int other_port = other_dp->index;
> -
> - if (dp == other_dp)
> - continue;
> -
> - /* Remove this port from the port matrix of the other ports
> - * in the same bridge. If the port is disabled, port matrix
> - * is kept and not being setup until the port becomes enabled.
> - */
> - if (!dsa_port_offloads_bridge(other_dp, &bridge))
> - continue;
> -
> - if (priv->ports[other_port].enable)
> - mt7530_clear(priv, MT7530_PCR_P(other_port),
> - PCR_MATRIX(BIT(port)));
> - priv->ports[other_port].pm &= ~PCR_MATRIX(BIT(port));
> - }
> -
> - /* Set the cpu port to be the only one in the port matrix of
> - * this port.
> - */
> - if (priv->ports[port].enable)
> - mt7530_rmw(priv, MT7530_PCR_P(port), PCR_MATRIX_MASK,
> - PCR_MATRIX(BIT(cpu_dp->index)));
> - priv->ports[port].pm = PCR_MATRIX(BIT(cpu_dp->index));
> + mt7530_update_port_member(priv, port, bridge.dev, false);
>
> /* When a port is removed from the bridge, the port would be set up
> * back to the default as is at initial boot which is a VLAN-unaware
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