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net: lan966x: Add lag support for lan966x
Add link aggregation hardware offload support for lan966x Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Horatiu Vultur
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David S. Miller
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Aug 22, 2022
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,337 @@ | ||
| // SPDX-License-Identifier: GPL-2.0+ | ||
|
|
||
| #include <linux/if_bridge.h> | ||
|
|
||
| #include "lan966x_main.h" | ||
|
|
||
| static void lan966x_lag_set_aggr_pgids(struct lan966x *lan966x) | ||
| { | ||
| u32 visited = GENMASK(lan966x->num_phys_ports - 1, 0); | ||
| int p, lag, i; | ||
|
|
||
| /* Reset destination and aggregation PGIDS */ | ||
| for (p = 0; p < lan966x->num_phys_ports; ++p) | ||
| lan_wr(ANA_PGID_PGID_SET(BIT(p)), | ||
| lan966x, ANA_PGID(p)); | ||
|
|
||
| for (p = PGID_AGGR; p < PGID_SRC; ++p) | ||
| lan_wr(ANA_PGID_PGID_SET(visited), | ||
| lan966x, ANA_PGID(p)); | ||
|
|
||
| /* The visited ports bitmask holds the list of ports offloading any | ||
| * bonding interface. Initially we mark all these ports as unvisited, | ||
| * then every time we visit a port in this bitmask, we know that it is | ||
| * the lowest numbered port, i.e. the one whose logical ID == physical | ||
| * port ID == LAG ID. So we mark as visited all further ports in the | ||
| * bitmask that are offloading the same bonding interface. This way, | ||
| * we set up the aggregation PGIDs only once per bonding interface. | ||
| */ | ||
| for (p = 0; p < lan966x->num_phys_ports; ++p) { | ||
| struct lan966x_port *port = lan966x->ports[p]; | ||
|
|
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| if (!port || !port->bond) | ||
| continue; | ||
|
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| visited &= ~BIT(p); | ||
| } | ||
|
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| /* Now, set PGIDs for each active LAG */ | ||
| for (lag = 0; lag < lan966x->num_phys_ports; ++lag) { | ||
| struct net_device *bond = lan966x->ports[lag]->bond; | ||
| int num_active_ports = 0; | ||
| unsigned long bond_mask; | ||
| u8 aggr_idx[16]; | ||
|
|
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| if (!bond || (visited & BIT(lag))) | ||
| continue; | ||
|
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| bond_mask = lan966x_lag_get_mask(lan966x, bond); | ||
|
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| for_each_set_bit(p, &bond_mask, lan966x->num_phys_ports) { | ||
| struct lan966x_port *port = lan966x->ports[p]; | ||
|
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| lan_wr(ANA_PGID_PGID_SET(bond_mask), | ||
| lan966x, ANA_PGID(p)); | ||
| if (port->lag_tx_active) | ||
| aggr_idx[num_active_ports++] = p; | ||
| } | ||
|
|
||
| for (i = PGID_AGGR; i < PGID_SRC; ++i) { | ||
| u32 ac; | ||
|
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| ac = lan_rd(lan966x, ANA_PGID(i)); | ||
| ac &= ~bond_mask; | ||
| /* 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]); | ||
| lan_wr(ANA_PGID_PGID_SET(ac), | ||
| lan966x, ANA_PGID(i)); | ||
| } | ||
|
|
||
| /* Mark all ports in the same LAG as visited to avoid applying | ||
| * the same config again. | ||
| */ | ||
| for (p = lag; p < lan966x->num_phys_ports; p++) { | ||
| struct lan966x_port *port = lan966x->ports[p]; | ||
|
|
||
| if (!port) | ||
| continue; | ||
|
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| if (port->bond == bond) | ||
| visited |= BIT(p); | ||
| } | ||
| } | ||
| } | ||
|
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||
| static void lan966x_lag_set_port_ids(struct lan966x *lan966x) | ||
| { | ||
| struct lan966x_port *port; | ||
| u32 bond_mask; | ||
| u32 lag_id; | ||
| int p; | ||
|
|
||
| for (p = 0; p < lan966x->num_phys_ports; ++p) { | ||
| port = lan966x->ports[p]; | ||
| if (!port) | ||
| continue; | ||
|
|
||
| lag_id = port->chip_port; | ||
|
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| bond_mask = lan966x_lag_get_mask(lan966x, port->bond); | ||
| if (bond_mask) | ||
| lag_id = __ffs(bond_mask); | ||
|
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||
| lan_rmw(ANA_PORT_CFG_PORTID_VAL_SET(lag_id), | ||
| ANA_PORT_CFG_PORTID_VAL, | ||
| lan966x, ANA_PORT_CFG(port->chip_port)); | ||
| } | ||
| } | ||
|
|
||
| static void lan966x_lag_update_ids(struct lan966x *lan966x) | ||
| { | ||
| lan966x_lag_set_port_ids(lan966x); | ||
| lan966x_update_fwd_mask(lan966x); | ||
| lan966x_lag_set_aggr_pgids(lan966x); | ||
| } | ||
|
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||
| int lan966x_lag_port_join(struct lan966x_port *port, | ||
| struct net_device *brport_dev, | ||
| struct net_device *bond, | ||
| struct netlink_ext_ack *extack) | ||
| { | ||
| struct lan966x *lan966x = port->lan966x; | ||
| struct net_device *dev = port->dev; | ||
| int err; | ||
|
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| port->bond = bond; | ||
| lan966x_lag_update_ids(lan966x); | ||
|
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| err = switchdev_bridge_port_offload(brport_dev, dev, port, | ||
| &lan966x_switchdev_nb, | ||
| &lan966x_switchdev_blocking_nb, | ||
| false, extack); | ||
| if (err) | ||
| goto out; | ||
|
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| lan966x_port_stp_state_set(port, br_port_get_stp_state(brport_dev)); | ||
|
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| return 0; | ||
|
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| out: | ||
| port->bond = NULL; | ||
| lan966x_lag_update_ids(lan966x); | ||
|
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| return err; | ||
| } | ||
|
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| void lan966x_lag_port_leave(struct lan966x_port *port, struct net_device *bond) | ||
| { | ||
| struct lan966x *lan966x = port->lan966x; | ||
|
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| port->bond = NULL; | ||
| lan966x_lag_update_ids(lan966x); | ||
| lan966x_port_stp_state_set(port, BR_STATE_FORWARDING); | ||
| } | ||
|
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| static bool lan966x_lag_port_check_hash_types(struct lan966x *lan966x, | ||
| enum netdev_lag_hash hash_type) | ||
| { | ||
| int p; | ||
|
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| for (p = 0; p < lan966x->num_phys_ports; ++p) { | ||
| struct lan966x_port *port = lan966x->ports[p]; | ||
|
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| if (!port || !port->bond) | ||
| continue; | ||
|
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| if (port->hash_type != hash_type) | ||
| return false; | ||
| } | ||
|
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| return true; | ||
| } | ||
|
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| int lan966x_lag_port_prechangeupper(struct net_device *dev, | ||
| struct netdev_notifier_changeupper_info *info) | ||
| { | ||
| struct lan966x_port *port = netdev_priv(dev); | ||
| struct lan966x *lan966x = port->lan966x; | ||
| struct netdev_lag_upper_info *lui; | ||
| struct netlink_ext_ack *extack; | ||
|
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| extack = netdev_notifier_info_to_extack(&info->info); | ||
| lui = info->upper_info; | ||
| if (!lui) { | ||
| port->hash_type = NETDEV_LAG_HASH_NONE; | ||
| return NOTIFY_DONE; | ||
| } | ||
|
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| if (lui->tx_type != NETDEV_LAG_TX_TYPE_HASH) { | ||
| NL_SET_ERR_MSG_MOD(extack, | ||
| "LAG device using unsupported Tx type"); | ||
| return -EINVAL; | ||
| } | ||
|
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| if (!lan966x_lag_port_check_hash_types(lan966x, lui->hash_type)) { | ||
| NL_SET_ERR_MSG_MOD(extack, | ||
| "LAG devices can have only the same hash_type"); | ||
| return -EINVAL; | ||
| } | ||
|
|
||
| switch (lui->hash_type) { | ||
| case NETDEV_LAG_HASH_L2: | ||
| lan_wr(ANA_AGGR_CFG_AC_DMAC_ENA_SET(1) | | ||
| ANA_AGGR_CFG_AC_SMAC_ENA_SET(1), | ||
| lan966x, ANA_AGGR_CFG); | ||
| break; | ||
| case NETDEV_LAG_HASH_L34: | ||
| lan_wr(ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA_SET(1) | | ||
| ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA_SET(1) | | ||
| ANA_AGGR_CFG_AC_IP4_SIPDIP_ENA_SET(1), | ||
| lan966x, ANA_AGGR_CFG); | ||
| break; | ||
| case NETDEV_LAG_HASH_L23: | ||
| lan_wr(ANA_AGGR_CFG_AC_DMAC_ENA_SET(1) | | ||
| ANA_AGGR_CFG_AC_SMAC_ENA_SET(1) | | ||
| ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA_SET(1) | | ||
| ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA_SET(1), | ||
| lan966x, ANA_AGGR_CFG); | ||
| break; | ||
| default: | ||
| NL_SET_ERR_MSG_MOD(extack, | ||
| "LAG device using unsupported hash type"); | ||
| return -EINVAL; | ||
| } | ||
|
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| port->hash_type = lui->hash_type; | ||
|
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| return NOTIFY_OK; | ||
| } | ||
|
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| int lan966x_lag_port_changelowerstate(struct net_device *dev, | ||
| struct netdev_notifier_changelowerstate_info *info) | ||
| { | ||
| struct netdev_lag_lower_state_info *lag = info->lower_state_info; | ||
| struct lan966x_port *port = netdev_priv(dev); | ||
| struct lan966x *lan966x = port->lan966x; | ||
| bool is_active; | ||
|
|
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| if (!port->bond) | ||
| return NOTIFY_DONE; | ||
|
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| is_active = lag->link_up && lag->tx_enabled; | ||
| if (port->lag_tx_active == is_active) | ||
| return NOTIFY_DONE; | ||
|
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| port->lag_tx_active = is_active; | ||
| lan966x_lag_set_aggr_pgids(lan966x); | ||
|
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| return NOTIFY_OK; | ||
| } | ||
|
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| int lan966x_lag_netdev_prechangeupper(struct net_device *dev, | ||
| struct netdev_notifier_changeupper_info *info) | ||
| { | ||
| struct lan966x_port *port; | ||
| struct net_device *lower; | ||
| struct list_head *iter; | ||
| int err; | ||
|
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| netdev_for_each_lower_dev(dev, lower, iter) { | ||
| if (!lan966x_netdevice_check(lower)) | ||
| continue; | ||
|
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| port = netdev_priv(lower); | ||
| if (port->bond != dev) | ||
| continue; | ||
|
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| err = lan966x_port_prechangeupper(lower, dev, info); | ||
| if (err) | ||
| return err; | ||
| } | ||
|
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| return NOTIFY_DONE; | ||
| } | ||
|
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| int lan966x_lag_netdev_changeupper(struct net_device *dev, | ||
| struct netdev_notifier_changeupper_info *info) | ||
| { | ||
| struct lan966x_port *port; | ||
| struct net_device *lower; | ||
| struct list_head *iter; | ||
| int err; | ||
|
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| netdev_for_each_lower_dev(dev, lower, iter) { | ||
| if (!lan966x_netdevice_check(lower)) | ||
| continue; | ||
|
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| port = netdev_priv(lower); | ||
| if (port->bond != dev) | ||
| continue; | ||
|
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| err = lan966x_port_changeupper(lower, dev, info); | ||
| if (err) | ||
| return err; | ||
| } | ||
|
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| return NOTIFY_DONE; | ||
| } | ||
|
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| bool lan966x_lag_first_port(struct net_device *lag, struct net_device *dev) | ||
| { | ||
| struct lan966x_port *port = netdev_priv(dev); | ||
| struct lan966x *lan966x = port->lan966x; | ||
| unsigned long bond_mask; | ||
|
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| if (port->bond != lag) | ||
| return false; | ||
|
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| bond_mask = lan966x_lag_get_mask(lan966x, lag); | ||
| if (bond_mask && port->chip_port == __ffs(bond_mask)) | ||
| return true; | ||
|
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| return false; | ||
| } | ||
|
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| u32 lan966x_lag_get_mask(struct lan966x *lan966x, struct net_device *bond) | ||
| { | ||
| struct lan966x_port *port; | ||
| u32 mask = 0; | ||
| int p; | ||
|
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| if (!bond) | ||
| return mask; | ||
|
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| for (p = 0; p < lan966x->num_phys_ports; p++) { | ||
| port = lan966x->ports[p]; | ||
| if (!port) | ||
| continue; | ||
|
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| if (port->bond == bond) | ||
| mask |= BIT(p); | ||
| } | ||
|
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||
| return mask; | ||
| } |
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