[patch net-next 24/26] mlxsw: spectrum: Implement LAG port join/leave

Jiri Pirko
2015-12-01T13:49:38Z

From: Jiri Pirko <jiri@mellanox.com>

Implement basic procedures for joining/leaving port to/from LAG. That
includes HW setup of collector, core LAG mapping setup.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
---
drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 284 +++++++++++++++++++++++--
drivers/net/ethernet/mellanox/mlxsw/spectrum.h | 35 ++-
2 files changed, 302 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index a397cc1..171748e 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -1712,6 +1712,22 @@ static int mlxsw_sp_flood_init(struct mlxsw_sp *mlxsw_sp)
return 0;
}

+static int mlxsw_sp_lag_init(struct mlxsw_sp *mlxsw_sp)
+{
+ char slcr_pl[MLXSW_REG_SLCR_LEN];
+
+ mlxsw_reg_slcr_pack(slcr_pl, MLXSW_REG_SLCR_LAG_HASH_SMAC |
+ MLXSW_REG_SLCR_LAG_HASH_DMAC |
+ MLXSW_REG_SLCR_LAG_HASH_ETHERTYPE |
+ MLXSW_REG_SLCR_LAG_HASH_VLANID |
+ MLXSW_REG_SLCR_LAG_HASH_SIP |
+ MLXSW_REG_SLCR_LAG_HASH_DIP |
+ MLXSW_REG_SLCR_LAG_HASH_SPORT |
+ MLXSW_REG_SLCR_LAG_HASH_DPORT |
+ MLXSW_REG_SLCR_LAG_HASH_IPPROTO);
+ return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(slcr), slcr_pl);
+}
+
static int mlxsw_sp_init(void *priv, struct mlxsw_core *mlxsw_core,
const struct mlxsw_bus_info *mlxsw_bus_info)
{
@@ -1757,6 +1773,12 @@ static int mlxsw_sp_init(void *priv, struct mlxsw_core *mlxsw_core,
goto err_buffers_init;
}

+ err = mlxsw_sp_lag_init(mlxsw_sp);
+ if (err) {
+ dev_err(mlxsw_sp->bus_info->dev, "Failed to initialize LAG\n");
+ goto err_lag_init;
+ }
+
err = mlxsw_sp_switchdev_init(mlxsw_sp);
if (err) {
dev_err(mlxsw_sp->bus_info->dev, "Failed to initialize switchdev\n");
@@ -1766,6 +1788,7 @@ static int mlxsw_sp_init(void *priv, struct mlxsw_core *mlxsw_core,
return 0;

err_switchdev_init:
+err_lag_init:
err_buffers_init:
err_flood_init:
mlxsw_sp_traps_fini(mlxsw_sp);
@@ -1793,9 +1816,9 @@ static struct mlxsw_config_profile mlxsw_sp_config_profile = {
.used_max_vepa_channels = 1,
.max_vepa_channels = 0,
.used_max_lag = 1,
- .max_lag = 64,
+ .max_lag = MLXSW_SP_LAG_MAX,
.used_max_port_per_lag = 1,
- .max_port_per_lag = 16,
+ .max_port_per_lag = MLXSW_SP_PORT_PER_LAG_MAX,
.used_max_mid = 1,
.max_mid = 7000,
.used_max_pgt = 1,
@@ -1894,19 +1917,206 @@ static void mlxsw_sp_master_bridge_dec(struct mlxsw_sp *mlxsw_sp,
mlxsw_sp->master_bridge.dev = NULL;
}

-static int mlxsw_sp_netdevice_event(struct notifier_block *unused,
- unsigned long event, void *ptr)
+static int mlxsw_sp_lag_create(struct mlxsw_sp *mlxsw_sp, u16 lag_id)
+{
+ char sldr_pl[MLXSW_REG_SLDR_LEN];
+
+ mlxsw_reg_sldr_lag_create_pack(sldr_pl, lag_id);
+ return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sldr), sldr_pl);
+}
+
+static int mlxsw_sp_lag_destroy(struct mlxsw_sp *mlxsw_sp, u16 lag_id)
+{
+ char sldr_pl[MLXSW_REG_SLDR_LEN];
+
+ mlxsw_reg_sldr_lag_destroy_pack(sldr_pl, lag_id);
+ return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sldr), sldr_pl);
+}
+
+static int mlxsw_sp_lag_col_port_add(struct mlxsw_sp_port *mlxsw_sp_port,
+ u16 lag_id, u8 port_index)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ char slcor_pl[MLXSW_REG_SLCOR_LEN];
+
+ mlxsw_reg_slcor_port_add_pack(slcor_pl, mlxsw_sp_port->local_port,
+ lag_id, port_index);
+ return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(slcor), slcor_pl);
+}
+
+static int mlxsw_sp_lag_col_port_remove(struct mlxsw_sp_port *mlxsw_sp_port,
+ u16 lag_id)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ char slcor_pl[MLXSW_REG_SLCOR_LEN];
+
+ mlxsw_reg_slcor_port_remove_pack(slcor_pl, mlxsw_sp_port->local_port,
+ lag_id);
+ return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(slcor), slcor_pl);
+}
+
+static int mlxsw_sp_lag_col_port_enable(struct mlxsw_sp_port *mlxsw_sp_port,
+ u16 lag_id)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ char slcor_pl[MLXSW_REG_SLCOR_LEN];
+
+ mlxsw_reg_slcor_col_enable_pack(slcor_pl, mlxsw_sp_port->local_port,
+ lag_id);
+ return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(slcor), slcor_pl);
+}
+
+static int mlxsw_sp_lag_col_port_disable(struct mlxsw_sp_port *mlxsw_sp_port,
+ u16 lag_id)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ char slcor_pl[MLXSW_REG_SLCOR_LEN];
+
+ mlxsw_reg_slcor_col_disable_pack(slcor_pl, mlxsw_sp_port->local_port,
+ lag_id);
+ return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(slcor), slcor_pl);
+}
+
+static int mlxsw_sp_lag_index_get(struct mlxsw_sp *mlxsw_sp,
+ struct net_device *lag_dev,
+ u16 *p_lag_id)
+{
+ struct mlxsw_sp_upper *lag;
+ int free_lag_id = -1;
+ int i;
+
+ for (i = 0; i < MLXSW_SP_LAG_MAX; i++) {
+ lag = mlxsw_sp_lag_get(mlxsw_sp, i);
+ if (lag->ref_count) {
+ if (lag->dev == lag_dev) {
+ *p_lag_id = i;
+ return 0;
+ }
+ } else if (free_lag_id < 0) {
+ free_lag_id = i;
+ }
+ }
+ if (free_lag_id < 0)
+ return -EBUSY;
+ *p_lag_id = free_lag_id;
+ return 0;
+}
+
+static bool
+mlxsw_sp_master_lag_check(struct mlxsw_sp *mlxsw_sp,
+ struct net_device *lag_dev,
+ struct netdev_lag_upper_info *lag_upper_info)
+{
+ u16 lag_id;
+
+ if (mlxsw_sp_lag_index_get(mlxsw_sp, lag_dev, &lag_id) != 0)
+ return false;
+ if (lag_upper_info->tx_type != NETDEV_LAG_TX_TYPE_HASH)
+ return false;
+ return true;
+}
+
+static int mlxsw_sp_port_lag_index_get(struct mlxsw_sp *mlxsw_sp,
+ u16 lag_id, u8 *p_port_index)
+{
+ int i;
+
+ for (i = 0; i < MLXSW_SP_PORT_PER_LAG_MAX; i++) {
+ if (!mlxsw_sp_port_lagged_get(mlxsw_sp, lag_id, i)) {
+ *p_port_index = i;
+ return 0;
+ }
+ }
+ return -EBUSY;
+}
+
+static int mlxsw_sp_port_lag_join(struct mlxsw_sp_port *mlxsw_sp_port,
+ struct net_device *lag_dev)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ struct mlxsw_sp_upper *lag;
+ u16 lag_id;
+ u8 port_index;
+ int err;
+
+ err = mlxsw_sp_lag_index_get(mlxsw_sp, lag_dev, &lag_id);
+ if (err)
+ return err;
+ lag = mlxsw_sp_lag_get(mlxsw_sp, lag_id);
+ if (!lag->ref_count) {
+ err = mlxsw_sp_lag_create(mlxsw_sp, lag_id);
+ if (err)
+ return err;
+ lag->dev = lag_dev;
+ }
+
+ err = mlxsw_sp_port_lag_index_get(mlxsw_sp, lag_id, &port_index);
+ if (err)
+ return err;
+ err = mlxsw_sp_lag_col_port_add(mlxsw_sp_port, lag_id, port_index);
+ if (err)
+ goto err_col_port_add;
+ err = mlxsw_sp_lag_col_port_enable(mlxsw_sp_port, lag_id);
+ if (err)
+ goto err_col_port_enable;
+
+ mlxsw_core_lag_mapping_set(mlxsw_sp->core, lag_id, port_index,
+ mlxsw_sp_port->local_port);
+ mlxsw_sp_port->lag_id = lag_id;
+ mlxsw_sp_port->lagged = 1;
+ lag->ref_count++;
+ return 0;
+
+err_col_port_add:
+ if (!lag->ref_count)
+ mlxsw_sp_lag_destroy(mlxsw_sp, lag_id);
+err_col_port_enable:
+ mlxsw_sp_lag_col_port_remove(mlxsw_sp_port, lag_id);
+ return err;
+}
+
+static int mlxsw_sp_port_lag_leave(struct mlxsw_sp_port *mlxsw_sp_port,
+ struct net_device *lag_dev)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ struct mlxsw_sp_upper *lag;
+ u16 lag_id = mlxsw_sp_port->lag_id;
+ int err;
+
+ if (!mlxsw_sp_port->lagged)
+ return 0;
+ lag = mlxsw_sp_lag_get(mlxsw_sp, lag_id);
+ BUG_ON(lag->ref_count == 0);
+
+ err = mlxsw_sp_lag_col_port_disable(mlxsw_sp_port, lag_id);
+ if (err)
+ return err;
+ mlxsw_sp_lag_col_port_remove(mlxsw_sp_port, lag_id);
+ if (err)
+ return err;
+
+ if (lag->ref_count == 1) {
+ err = mlxsw_sp_lag_destroy(mlxsw_sp, lag_id);
+ if (err)
+ return err;
+ }
+
+ mlxsw_core_lag_mapping_clear(mlxsw_sp->core, lag_id,
+ mlxsw_sp_port->local_port);
+ mlxsw_sp_port->lagged = 0;
+ lag->ref_count--;
+ return 0;
+}
+
+static int mlxsw_sp_netdevice_port_event(struct net_device *dev,
+ unsigned long event, void *ptr)
{
- struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct netdev_notifier_changeupper_info *info;
struct mlxsw_sp_port *mlxsw_sp_port;
struct net_device *upper_dev;
struct mlxsw_sp *mlxsw_sp;
int err;

- if (!mlxsw_sp_port_dev_check(dev))
- return NOTIFY_DONE;
-
mlxsw_sp_port = netdev_priv(dev);
mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
info = ptr;
@@ -1914,16 +2124,22 @@ static int mlxsw_sp_netdevice_event(struct notifier_block *unused,
switch (event) {
case NETDEV_PRECHANGEUPPER:
upper_dev = info->upper_dev;
+ if (!info->master || !info->linking)
+ break;
/* HW limitation forbids to put ports to multiple bridges. */
- if (info->master && info->linking &&
- netif_is_bridge_master(upper_dev) &&
+ if (netif_is_bridge_master(upper_dev) &&
!mlxsw_sp_master_bridge_check(mlxsw_sp, upper_dev))
return NOTIFY_BAD;
+ if (netif_is_lag_master(upper_dev) &&
+ !mlxsw_sp_master_lag_check(mlxsw_sp, upper_dev,
+ info->upper_info))
+ return NOTIFY_BAD;
break;
case NETDEV_CHANGEUPPER:
upper_dev = info->upper_dev;
- if (info->master &&
- netif_is_bridge_master(upper_dev)) {
+ if (!info->master)
+ break;
+ if (netif_is_bridge_master(upper_dev)) {
if (info->linking) {
err = mlxsw_sp_port_bridge_join(mlxsw_sp_port);
if (err)
@@ -1937,6 +2153,18 @@ static int mlxsw_sp_netdevice_event(struct notifier_block *unused,
mlxsw_sp_port->bridged = 0;
mlxsw_sp_master_bridge_dec(mlxsw_sp, upper_dev);
}
+ } else if (netif_is_lag_master(upper_dev)) {
+ if (info->linking) {
+ err = mlxsw_sp_port_lag_join(mlxsw_sp_port,
+ upper_dev);
+ if (err)
+ netdev_err(dev, "Failed to join link aggregation\n");
+ } else {
+ err = mlxsw_sp_port_lag_leave(mlxsw_sp_port,
+ upper_dev);
+ if (err)
+ netdev_err(dev, "Failed to leave link aggregation\n");
+ }
}
break;
}
@@ -1944,6 +2172,38 @@ static int mlxsw_sp_netdevice_event(struct notifier_block *unused,
return NOTIFY_DONE;
}

+static int mlxsw_sp_netdevice_lag_event(struct net_device *lag_dev,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev;
+ struct list_head *iter;
+ int ret;
+
+ netdev_for_each_lower_dev(lag_dev, dev, iter) {
+ if (mlxsw_sp_port_dev_check(dev)) {
+ ret = mlxsw_sp_netdevice_port_event(dev, event, ptr);
+ if (ret == NOTIFY_BAD)
+ return ret;
+ }
+ }
+
+ return NOTIFY_DONE;
+}
+
+static int mlxsw_sp_netdevice_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+ if (mlxsw_sp_port_dev_check(dev))
+ return mlxsw_sp_netdevice_port_event(dev, event, ptr);
+
+ if (netif_is_lag_master(dev))
+ return mlxsw_sp_netdevice_lag_event(dev, event, ptr);
+
+ return NOTIFY_DONE;
+}
+
static struct notifier_block mlxsw_sp_netdevice_nb __read_mostly = {
.notifier_call = mlxsw_sp_netdevice_event,
};
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index 4365c8b..48be5a6 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -46,9 +46,16 @@
#include "core.h"

#define MLXSW_SP_VFID_BASE VLAN_N_VID
+#define MLXSW_SP_LAG_MAX 64
+#define MLXSW_SP_PORT_PER_LAG_MAX 16

struct mlxsw_sp_port;

+struct mlxsw_sp_upper {
+ struct net_device *dev;
+ unsigned int ref_count;
+};
+
struct mlxsw_sp {
unsigned long active_vfids[BITS_TO_LONGS(VLAN_N_VID)];
unsigned long active_fids[BITS_TO_LONGS(VLAN_N_VID)];
@@ -63,12 +70,16 @@ struct mlxsw_sp {
} fdb_notify;
#define MLXSW_SP_DEFAULT_AGEING_TIME 300
u32 ageing_time;
- struct {
- struct net_device *dev;
- unsigned int ref_count;
- } master_bridge;
+ struct mlxsw_sp_upper master_bridge;
+ struct mlxsw_sp_upper lags[MLXSW_SP_LAG_MAX];
};

+static inline struct mlxsw_sp_upper *
+mlxsw_sp_lag_get(struct mlxsw_sp *mlxsw_sp, u16 lag_id)
+{
+ return &mlxsw_sp->lags[lag_id];
+}
+
struct mlxsw_sp_port_pcpu_stats {
u64 rx_packets;
u64 rx_bytes;
@@ -87,8 +98,10 @@ struct mlxsw_sp_port {
u8 learning:1,
learning_sync:1,
uc_flood:1,
- bridged:1;
+ bridged:1,
+ lagged:1;
u16 pvid;
+ u16 lag_id;
/* 802.1Q bridge VLANs */
unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
/* VLAN interfaces */
@@ -96,6 +109,18 @@ struct mlxsw_sp_port {
u16 nr_vfids;
};

+static inline struct mlxsw_sp_port *
+mlxsw_sp_port_lagged_get(struct mlxsw_sp *mlxsw_sp, u16 lag_id, u8 port_index)
+{
+ struct mlxsw_sp_port *mlxsw_sp_port;
+ u8 local_port;
+
+ local_port = mlxsw_core_lag_mapping_get(mlxsw_sp->core,
+ lag_id, port_index);
+ mlxsw_sp_port = mlxsw_sp->ports[local_port];
+ return mlxsw_sp_port && mlxsw_sp_port->lagged ? mlxsw_sp_port : NULL;
+}
+
enum mlxsw_sp_flood_table {
MLXSW_SP_FLOOD_TABLE_UC,
MLXSW_SP_FLOOD_TABLE_BM,
--
1.9.3