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Date: Tue, 15 Dec 2020 15:37:11 +0100
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: Tobias Waldekranz <tobias@...dekranz.com>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Vivien Didelot <vivien.didelot@...il.com>,
Claudiu Manoil <claudiu.manoil@....com>
Subject: Re: [RFC PATCH net-next 01/16] net: mscc: ocelot: offload bridge
port flags to device
On 08/12/2020 14:07:47+0200, Vladimir Oltean wrote:
> We should not be unconditionally enabling address learning, since doing
> that is actively detrimential when a port is standalone and not offloading
> a bridge. Namely, if a port in the switch is standalone and others are
> offloading the bridge, then we could enter a situation where we learn an
> address towards the standalone port, but the bridged ports could not
> forward the packet there, because the CPU is the only path between the
> standalone and the bridged ports. The solution of course is to not
> enable address learning unless the bridge asks for it. Currently this is
> the only bridge port flag we are looking at. The others (flooding etc)
> are TBD.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> ---
> drivers/net/ethernet/mscc/ocelot.c | 21 ++++++++++++++++++++-
> drivers/net/ethernet/mscc/ocelot.h | 3 +++
> drivers/net/ethernet/mscc/ocelot_net.c | 4 ++++
> include/soc/mscc/ocelot.h | 2 ++
> 4 files changed, 29 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
> index b9626eec8db6..7a5c534099d3 100644
> --- a/drivers/net/ethernet/mscc/ocelot.c
> +++ b/drivers/net/ethernet/mscc/ocelot.c
> @@ -883,6 +883,7 @@ EXPORT_SYMBOL(ocelot_get_ts_info);
>
> void ocelot_bridge_stp_state_set(struct ocelot *ocelot, int port, u8 state)
> {
> + struct ocelot_port *ocelot_port = ocelot->ports[port];
> u32 port_cfg;
> int p, i;
>
> @@ -896,7 +897,8 @@ void ocelot_bridge_stp_state_set(struct ocelot *ocelot, int port, u8 state)
> ocelot->bridge_fwd_mask |= BIT(port);
> fallthrough;
> case BR_STATE_LEARNING:
> - port_cfg |= ANA_PORT_PORT_CFG_LEARN_ENA;
> + if (ocelot_port->brport_flags & BR_LEARNING)
> + port_cfg |= ANA_PORT_PORT_CFG_LEARN_ENA;
> break;
>
> default:
> @@ -1178,6 +1180,7 @@ EXPORT_SYMBOL(ocelot_port_bridge_join);
> int ocelot_port_bridge_leave(struct ocelot *ocelot, int port,
> struct net_device *bridge)
> {
> + struct ocelot_port *ocelot_port = ocelot->ports[port];
> struct ocelot_vlan pvid = {0}, native_vlan = {0};
> struct switchdev_trans trans;
> int ret;
> @@ -1200,6 +1203,10 @@ int ocelot_port_bridge_leave(struct ocelot *ocelot, int port,
> ocelot_port_set_pvid(ocelot, port, pvid);
> ocelot_port_set_native_vlan(ocelot, port, native_vlan);
>
> + ocelot_port->brport_flags = 0;
> + ocelot_rmw_gix(ocelot, 0, ANA_PORT_PORT_CFG_LEARN_ENA,
> + ANA_PORT_PORT_CFG, port);
> +
> return 0;
> }
> EXPORT_SYMBOL(ocelot_port_bridge_leave);
> @@ -1391,6 +1398,18 @@ int ocelot_get_max_mtu(struct ocelot *ocelot, int port)
> }
> EXPORT_SYMBOL(ocelot_get_max_mtu);
>
> +void ocelot_port_bridge_flags(struct ocelot *ocelot, int port,
> + unsigned long flags,
> + struct switchdev_trans *trans)
> +{
> + struct ocelot_port *ocelot_port = ocelot->ports[port];
> +
> + if (switchdev_trans_ph_prepare(trans))
> + return;
> +
> + ocelot_port->brport_flags = flags;
> +}
> +
> void ocelot_init_port(struct ocelot *ocelot, int port)
> {
> struct ocelot_port *ocelot_port = ocelot->ports[port];
> diff --git a/drivers/net/ethernet/mscc/ocelot.h b/drivers/net/ethernet/mscc/ocelot.h
> index 291d39d49c4e..739bd201d951 100644
> --- a/drivers/net/ethernet/mscc/ocelot.h
> +++ b/drivers/net/ethernet/mscc/ocelot.h
> @@ -102,6 +102,9 @@ struct ocelot_multicast {
> struct ocelot_pgid *pgid;
> };
>
> +void ocelot_port_bridge_flags(struct ocelot *ocelot, int port,
> + unsigned long flags,
> + struct switchdev_trans *trans);
> int ocelot_port_fdb_do_dump(const unsigned char *addr, u16 vid,
> bool is_static, void *data);
> int ocelot_mact_learn(struct ocelot *ocelot, int port,
> diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
> index 9ba7e2b166e9..93ecd5274156 100644
> --- a/drivers/net/ethernet/mscc/ocelot_net.c
> +++ b/drivers/net/ethernet/mscc/ocelot_net.c
> @@ -882,6 +882,10 @@ static int ocelot_port_attr_set(struct net_device *dev,
> case SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED:
> ocelot_port_attr_mc_set(ocelot, port, !attr->u.mc_disabled);
> break;
> + case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
> + ocelot_port_bridge_flags(ocelot, port, attr->u.brport_flags,
> + trans);
> + break;
> default:
> err = -EOPNOTSUPP;
> break;
> diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
> index 2f4cd3288bcc..50514c087231 100644
> --- a/include/soc/mscc/ocelot.h
> +++ b/include/soc/mscc/ocelot.h
> @@ -581,6 +581,8 @@ struct ocelot_port {
>
> struct regmap *target;
>
> + unsigned long brport_flags;
> +
> bool vlan_aware;
> /* VLAN that untagged frames are classified to, on ingress */
> struct ocelot_vlan pvid_vlan;
> --
> 2.25.1
>
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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