Commit eeed992b authored by Petr Machata's avatar Petr Machata Committed by David S. Miller

net: Add lag.h, net_lag_port_dev_txable()

LAG devices (team or bond) recognize for each one of their slave devices
whether LAG traffic is going to be sent through that device. Bond calls
such devices "active", team calls them "txable". When this state
changes, a NETDEV_CHANGELOWERSTATE notification is distributed, together
with a netdev_notifier_changelowerstate_info structure that for LAG
devices includes a tx_enabled flag that refers to the new state. The
notification thus makes it possible to react to the changes in txability
in drivers.

However there's no way to query txability from the outside on demand.
That is problematic namely for mlxsw, which when resolving ERSPAN packet
path, may encounter a LAG device, and needs to determine which of the
slaves it should choose.

To that end, introduce a new function, net_lag_port_dev_txable(), which
determines whether a given slave device is "active" or
"txable" (depending on the flavor of the LAG device). That function then
dispatches to per-LAG-flavor helpers, bond_is_active_slave_dev() resp.
team_port_dev_txable().

Because there currently is no good place where net_lag_port_dev_txable()
should be added, introduce a new header file, lag.h, which should from
now on hold any logic common to both team and bond. (But keep
netif_is_lag_master() together with the rest of netif_is_*_master()
functions).
Signed-off-by: default avatarPetr Machata <petrm@mellanox.com>
Reviewed-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3443b00e
...@@ -89,6 +89,19 @@ static inline bool team_port_txable(struct team_port *port) ...@@ -89,6 +89,19 @@ static inline bool team_port_txable(struct team_port *port)
return port->linkup && team_port_enabled(port); return port->linkup && team_port_enabled(port);
} }
static inline bool team_port_dev_txable(const struct net_device *port_dev)
{
struct team_port *port;
bool txable;
rcu_read_lock();
port = team_port_get_rcu(port_dev);
txable = port ? team_port_txable(port) : false;
rcu_read_unlock();
return txable;
}
#ifdef CONFIG_NET_POLL_CONTROLLER #ifdef CONFIG_NET_POLL_CONTROLLER
static inline void team_netpoll_send_skb(struct team_port *port, static inline void team_netpoll_send_skb(struct team_port *port,
struct sk_buff *skb) struct sk_buff *skb)
......
...@@ -411,6 +411,19 @@ static inline bool bond_slave_can_tx(struct slave *slave) ...@@ -411,6 +411,19 @@ static inline bool bond_slave_can_tx(struct slave *slave)
bond_is_active_slave(slave); bond_is_active_slave(slave);
} }
static inline bool bond_is_active_slave_dev(const struct net_device *slave_dev)
{
struct slave *slave;
bool active;
rcu_read_lock();
slave = bond_slave_get_rcu(slave_dev);
active = bond_is_active_slave(slave);
rcu_read_unlock();
return active;
}
static inline void bond_hw_addr_copy(u8 *dst, const u8 *src, unsigned int len) static inline void bond_hw_addr_copy(u8 *dst, const u8 *src, unsigned int len)
{ {
if (len == ETH_ALEN) { if (len == ETH_ALEN) {
......
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_IF_LAG_H
#define _LINUX_IF_LAG_H
#include <linux/netdevice.h>
#include <linux/if_team.h>
#include <net/bonding.h>
static inline bool net_lag_port_dev_txable(const struct net_device *port_dev)
{
if (netif_is_team_port(port_dev))
return team_port_dev_txable(port_dev);
else
return bond_is_active_slave_dev(port_dev);
}
#endif /* _LINUX_IF_LAG_H */
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