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Date: Wed, 16 Dec 2020 22:32:24 +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 14/16] net: mscc: ocelot: rebalance LAGs on
link up/down events
On 08/12/2020 14:08:00+0200, Vladimir Oltean wrote:
> At present there is an issue when ocelot is offloading a bonding
> interface, but one of the links of the physical ports goes down. Traffic
> keeps being hashed towards that destination, and of course gets dropped
> on egress.
>
> Monitor the netdev notifier events emitted by the bonding driver for
> changes in the physical state of lower interfaces, to determine which
> ports are active and which ones are no longer.
>
> Then extend ocelot_get_bond_mask to return either the configured bonding
> interfaces, or the active ones, depending on a boolean argument. The
> code that does rebalancing only needs to do so among the active ports,
> whereas the bridge forwarding mask and the logical port IDs still need
> to look at the permanently bonded ports.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
> drivers/net/ethernet/mscc/ocelot.c | 43 ++++++++++++++++++++------
> drivers/net/ethernet/mscc/ocelot.h | 2 ++
> drivers/net/ethernet/mscc/ocelot_net.c | 26 ++++++++++++++++
> include/soc/mscc/ocelot.h | 1 +
> 4 files changed, 63 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
> index d87e80a15ca5..5c71d121048d 100644
> --- a/drivers/net/ethernet/mscc/ocelot.c
> +++ b/drivers/net/ethernet/mscc/ocelot.c
> @@ -881,7 +881,8 @@ int ocelot_get_ts_info(struct ocelot *ocelot, int port,
> }
> EXPORT_SYMBOL(ocelot_get_ts_info);
>
> -static u32 ocelot_get_bond_mask(struct ocelot *ocelot, struct net_device *bond)
> +static u32 ocelot_get_bond_mask(struct ocelot *ocelot, struct net_device *bond,
> + bool just_active_ports)
only_active_ports maybe ?
> {
> u32 bond_mask = 0;
> int port;
> @@ -892,8 +893,12 @@ static u32 ocelot_get_bond_mask(struct ocelot *ocelot, struct net_device *bond)
> if (!ocelot_port)
> continue;
>
> - if (ocelot_port->bond == bond)
> + if (ocelot_port->bond == bond) {
> + if (just_active_ports && !ocelot_port->lag_tx_active)
> + continue;
> +
> bond_mask |= BIT(port);
> + }
> }
>
> return bond_mask;
> @@ -919,7 +924,7 @@ static void ocelot_apply_bridge_fwd_mask(struct ocelot *ocelot)
> struct net_device *bond = ocelot_port->bond;
>
> if (bond)
> - mask &= ~ocelot_get_bond_mask(ocelot, bond);
> + mask &= ~ocelot_get_bond_mask(ocelot, bond, false);
>
> ocelot_write_rix(ocelot, mask,
> ANA_PGID_PGID, PGID_SRC + port);
> @@ -1261,22 +1266,22 @@ static int ocelot_set_aggr_pgids(struct ocelot *ocelot)
> bonds[port] = ocelot_port->bond;
> }
>
> - /* Now, set PGIDs for each LAG */
> + /* Now, set PGIDs for each active LAG */
> for (lag = 0; lag < ocelot->num_phys_ports; lag++) {
> - int num_ports_in_lag = 0;
> + int num_active_ports = 0;
> unsigned long bond_mask;
> u8 aggr_idx[16];
>
> if (!bonds[lag])
> continue;
>
> - bond_mask = ocelot_get_bond_mask(ocelot, bonds[lag]);
> + bond_mask = ocelot_get_bond_mask(ocelot, bonds[lag], true);
>
> for_each_set_bit(port, &bond_mask, ocelot->num_phys_ports) {
> // Destination mask
> ocelot_write_rix(ocelot, bond_mask,
> ANA_PGID_PGID, port);
> - aggr_idx[num_ports_in_lag++] = port;
> + aggr_idx[num_active_ports++] = port;
> }
>
> for_each_aggr_pgid(ocelot, i) {
> @@ -1284,7 +1289,11 @@ static int ocelot_set_aggr_pgids(struct ocelot *ocelot)
>
> ac = ocelot_read_rix(ocelot, ANA_PGID_PGID, i);
> ac &= ~bond_mask;
> - ac |= BIT(aggr_idx[i % num_ports_in_lag]);
> + /* Don't do division by zero if there was no active
> + * port. Just make all aggregation codes zero.
> + */
> + if (num_active_ports)
> + ac |= BIT(aggr_idx[i % num_active_ports]);
> ocelot_write_rix(ocelot, ac, ANA_PGID_PGID, i);
> }
>
> @@ -1320,7 +1329,8 @@ static void ocelot_setup_logical_port_ids(struct ocelot *ocelot)
>
> bond = ocelot_port->bond;
> if (bond) {
> - int lag = __ffs(ocelot_get_bond_mask(ocelot, bond));
> + int lag = __ffs(ocelot_get_bond_mask(ocelot, bond,
> + false));
>
> ocelot_rmw_gix(ocelot,
> ANA_PORT_PORT_CFG_PORTID_VAL(lag),
> @@ -1357,6 +1367,21 @@ int ocelot_port_lag_leave(struct ocelot *ocelot, int port,
> }
> EXPORT_SYMBOL(ocelot_port_lag_leave);
>
> +int ocelot_port_lag_change(struct ocelot *ocelot, int port,
> + struct netdev_lag_lower_state_info *info)
> +{
> + struct ocelot_port *ocelot_port = ocelot->ports[port];
> + bool is_active = info->link_up && info->tx_enabled;
> +
> + if (ocelot_port->lag_tx_active == is_active)
> + return 0;
> +
> + ocelot_port->lag_tx_active = is_active;
> +
> + /* Rebalance the LAGs */
> + return ocelot_set_aggr_pgids(ocelot);
> +}
> +
> /* Configure the maximum SDU (L2 payload) on RX to the value specified in @sdu.
> * The length of VLAN tags is accounted for automatically via DEV_MAC_TAGS_CFG.
> * In the special case that it's the NPI port that we're configuring, the
> diff --git a/drivers/net/ethernet/mscc/ocelot.h b/drivers/net/ethernet/mscc/ocelot.h
> index bef8d5f8e6e5..0860125b623c 100644
> --- a/drivers/net/ethernet/mscc/ocelot.h
> +++ b/drivers/net/ethernet/mscc/ocelot.h
> @@ -116,6 +116,8 @@ int ocelot_port_lag_join(struct ocelot *ocelot, int port,
> struct net_device *bond);
> int ocelot_port_lag_leave(struct ocelot *ocelot, int port,
> struct net_device *bond);
> +int ocelot_port_lag_change(struct ocelot *ocelot, int port,
> + struct netdev_lag_lower_state_info *info);
> struct net_device *ocelot_port_to_netdev(struct ocelot *ocelot, int port);
> int ocelot_netdev_to_port(struct net_device *dev);
>
> diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
> index 93aaa631e347..714fc99f8339 100644
> --- a/drivers/net/ethernet/mscc/ocelot_net.c
> +++ b/drivers/net/ethernet/mscc/ocelot_net.c
> @@ -1065,6 +1065,23 @@ ocelot_netdevice_lag_changeupper(struct net_device *dev,
> return NOTIFY_DONE;
> }
>
> +static int
> +ocelot_netdevice_changelowerstate(struct net_device *dev,
> + struct netdev_lag_lower_state_info *linfo)
> +{
> + struct ocelot_port_private *priv = netdev_priv(dev);
> + struct ocelot_port *ocelot_port = &priv->port;
> + struct ocelot *ocelot = ocelot_port->ocelot;
> + int port = priv->chip_port;
> + int err;
> +
> + if (!ocelot_port->bond)
> + return NOTIFY_DONE;
> +
> + err = ocelot_port_lag_change(ocelot, port, linfo);
> + return notifier_from_errno(err);
> +}
> +
> static int ocelot_netdevice_event(struct notifier_block *unused,
> unsigned long event, void *ptr)
> {
> @@ -1082,6 +1099,15 @@ static int ocelot_netdevice_event(struct notifier_block *unused,
>
> break;
> }
> + case NETDEV_CHANGELOWERSTATE: {
> + struct netdev_notifier_changelowerstate_info *info = ptr;
> +
> + if (!ocelot_netdevice_dev_check(dev))
> + break;
> +
> + return ocelot_netdevice_changelowerstate(dev,
> + info->lower_state_info);
> + }
> default:
> break;
> }
> diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
> index 0cd45659430f..8a44b9064789 100644
> --- a/include/soc/mscc/ocelot.h
> +++ b/include/soc/mscc/ocelot.h
> @@ -599,6 +599,7 @@ struct ocelot_port {
> u8 *xmit_template;
>
> struct net_device *bond;
> + bool lag_tx_active;
> };
>
> struct ocelot {
> --
> 2.25.1
>
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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