linux/drivers/net/team/team.c

1729 lines
39 KiB
C

/*
* net/drivers/team/team.c - Network team device driver
* Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/rcupdate.h>
#include <linux/errno.h>
#include <linux/ctype.h>
#include <linux/notifier.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/if_arp.h>
#include <linux/socket.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <net/rtnetlink.h>
#include <net/genetlink.h>
#include <net/netlink.h>
#include <linux/if_team.h>
#define DRV_NAME "team"
/**********
* Helpers
**********/
#define team_port_exists(dev) (dev->priv_flags & IFF_TEAM_PORT)
static struct team_port *team_port_get_rcu(const struct net_device *dev)
{
struct team_port *port = rcu_dereference(dev->rx_handler_data);
return team_port_exists(dev) ? port : NULL;
}
static struct team_port *team_port_get_rtnl(const struct net_device *dev)
{
struct team_port *port = rtnl_dereference(dev->rx_handler_data);
return team_port_exists(dev) ? port : NULL;
}
/*
* Since the ability to change mac address for open port device is tested in
* team_port_add, this function can be called without control of return value
*/
static int __set_port_mac(struct net_device *port_dev,
const unsigned char *dev_addr)
{
struct sockaddr addr;
memcpy(addr.sa_data, dev_addr, ETH_ALEN);
addr.sa_family = ARPHRD_ETHER;
return dev_set_mac_address(port_dev, &addr);
}
int team_port_set_orig_mac(struct team_port *port)
{
return __set_port_mac(port->dev, port->orig.dev_addr);
}
int team_port_set_team_mac(struct team_port *port)
{
return __set_port_mac(port->dev, port->team->dev->dev_addr);
}
EXPORT_SYMBOL(team_port_set_team_mac);
/*******************
* Options handling
*******************/
struct team_option *__team_find_option(struct team *team, const char *opt_name)
{
struct team_option *option;
list_for_each_entry(option, &team->option_list, list) {
if (strcmp(option->name, opt_name) == 0)
return option;
}
return NULL;
}
int __team_options_register(struct team *team,
const struct team_option *option,
size_t option_count)
{
int i;
struct team_option **dst_opts;
int err;
dst_opts = kzalloc(sizeof(struct team_option *) * option_count,
GFP_KERNEL);
if (!dst_opts)
return -ENOMEM;
for (i = 0; i < option_count; i++, option++) {
if (__team_find_option(team, option->name)) {
err = -EEXIST;
goto rollback;
}
dst_opts[i] = kmemdup(option, sizeof(*option), GFP_KERNEL);
if (!dst_opts[i]) {
err = -ENOMEM;
goto rollback;
}
}
for (i = 0; i < option_count; i++) {
dst_opts[i]->changed = true;
dst_opts[i]->removed = false;
list_add_tail(&dst_opts[i]->list, &team->option_list);
}
kfree(dst_opts);
return 0;
rollback:
for (i = 0; i < option_count; i++)
kfree(dst_opts[i]);
kfree(dst_opts);
return err;
}
static void __team_options_mark_removed(struct team *team,
const struct team_option *option,
size_t option_count)
{
int i;
for (i = 0; i < option_count; i++, option++) {
struct team_option *del_opt;
del_opt = __team_find_option(team, option->name);
if (del_opt) {
del_opt->changed = true;
del_opt->removed = true;
}
}
}
static void __team_options_unregister(struct team *team,
const struct team_option *option,
size_t option_count)
{
int i;
for (i = 0; i < option_count; i++, option++) {
struct team_option *del_opt;
del_opt = __team_find_option(team, option->name);
if (del_opt) {
list_del(&del_opt->list);
kfree(del_opt);
}
}
}
static void __team_options_change_check(struct team *team);
int team_options_register(struct team *team,
const struct team_option *option,
size_t option_count)
{
int err;
err = __team_options_register(team, option, option_count);
if (err)
return err;
__team_options_change_check(team);
return 0;
}
EXPORT_SYMBOL(team_options_register);
void team_options_unregister(struct team *team,
const struct team_option *option,
size_t option_count)
{
__team_options_mark_removed(team, option, option_count);
__team_options_change_check(team);
__team_options_unregister(team, option, option_count);
}
EXPORT_SYMBOL(team_options_unregister);
static int team_option_get(struct team *team, struct team_option *option,
void *arg)
{
return option->getter(team, arg);
}
static int team_option_set(struct team *team, struct team_option *option,
void *arg)
{
int err;
err = option->setter(team, arg);
if (err)
return err;
option->changed = true;
__team_options_change_check(team);
return err;
}
/****************
* Mode handling
****************/
static LIST_HEAD(mode_list);
static DEFINE_SPINLOCK(mode_list_lock);
static struct team_mode *__find_mode(const char *kind)
{
struct team_mode *mode;
list_for_each_entry(mode, &mode_list, list) {
if (strcmp(mode->kind, kind) == 0)
return mode;
}
return NULL;
}
static bool is_good_mode_name(const char *name)
{
while (*name != '\0') {
if (!isalpha(*name) && !isdigit(*name) && *name != '_')
return false;
name++;
}
return true;
}
int team_mode_register(struct team_mode *mode)
{
int err = 0;
if (!is_good_mode_name(mode->kind) ||
mode->priv_size > TEAM_MODE_PRIV_SIZE)
return -EINVAL;
spin_lock(&mode_list_lock);
if (__find_mode(mode->kind)) {
err = -EEXIST;
goto unlock;
}
list_add_tail(&mode->list, &mode_list);
unlock:
spin_unlock(&mode_list_lock);
return err;
}
EXPORT_SYMBOL(team_mode_register);
int team_mode_unregister(struct team_mode *mode)
{
spin_lock(&mode_list_lock);
list_del_init(&mode->list);
spin_unlock(&mode_list_lock);
return 0;
}
EXPORT_SYMBOL(team_mode_unregister);
static struct team_mode *team_mode_get(const char *kind)
{
struct team_mode *mode;
spin_lock(&mode_list_lock);
mode = __find_mode(kind);
if (!mode) {
spin_unlock(&mode_list_lock);
request_module("team-mode-%s", kind);
spin_lock(&mode_list_lock);
mode = __find_mode(kind);
}
if (mode)
if (!try_module_get(mode->owner))
mode = NULL;
spin_unlock(&mode_list_lock);
return mode;
}
static void team_mode_put(const struct team_mode *mode)
{
module_put(mode->owner);
}
static bool team_dummy_transmit(struct team *team, struct sk_buff *skb)
{
dev_kfree_skb_any(skb);
return false;
}
rx_handler_result_t team_dummy_receive(struct team *team,
struct team_port *port,
struct sk_buff *skb)
{
return RX_HANDLER_ANOTHER;
}
static void team_adjust_ops(struct team *team)
{
/*
* To avoid checks in rx/tx skb paths, ensure here that non-null and
* correct ops are always set.
*/
if (list_empty(&team->port_list) ||
!team->mode || !team->mode->ops->transmit)
team->ops.transmit = team_dummy_transmit;
else
team->ops.transmit = team->mode->ops->transmit;
if (list_empty(&team->port_list) ||
!team->mode || !team->mode->ops->receive)
team->ops.receive = team_dummy_receive;
else
team->ops.receive = team->mode->ops->receive;
}
/*
* We can benefit from the fact that it's ensured no port is present
* at the time of mode change. Therefore no packets are in fly so there's no
* need to set mode operations in any special way.
*/
static int __team_change_mode(struct team *team,
const struct team_mode *new_mode)
{
/* Check if mode was previously set and do cleanup if so */
if (team->mode) {
void (*exit_op)(struct team *team) = team->ops.exit;
/* Clear ops area so no callback is called any longer */
memset(&team->ops, 0, sizeof(struct team_mode_ops));
team_adjust_ops(team);
if (exit_op)
exit_op(team);
team_mode_put(team->mode);
team->mode = NULL;
/* zero private data area */
memset(&team->mode_priv, 0,
sizeof(struct team) - offsetof(struct team, mode_priv));
}
if (!new_mode)
return 0;
if (new_mode->ops->init) {
int err;
err = new_mode->ops->init(team);
if (err)
return err;
}
team->mode = new_mode;
memcpy(&team->ops, new_mode->ops, sizeof(struct team_mode_ops));
team_adjust_ops(team);
return 0;
}
static int team_change_mode(struct team *team, const char *kind)
{
struct team_mode *new_mode;
struct net_device *dev = team->dev;
int err;
if (!list_empty(&team->port_list)) {
netdev_err(dev, "No ports can be present during mode change\n");
return -EBUSY;
}
if (team->mode && strcmp(team->mode->kind, kind) == 0) {
netdev_err(dev, "Unable to change to the same mode the team is in\n");
return -EINVAL;
}
new_mode = team_mode_get(kind);
if (!new_mode) {
netdev_err(dev, "Mode \"%s\" not found\n", kind);
return -EINVAL;
}
err = __team_change_mode(team, new_mode);
if (err) {
netdev_err(dev, "Failed to change to mode \"%s\"\n", kind);
team_mode_put(new_mode);
return err;
}
netdev_info(dev, "Mode changed to \"%s\"\n", kind);
return 0;
}
/************************
* Rx path frame handler
************************/
/* note: already called with rcu_read_lock */
static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
struct team_port *port;
struct team *team;
rx_handler_result_t res;
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
return RX_HANDLER_CONSUMED;
*pskb = skb;
port = team_port_get_rcu(skb->dev);
team = port->team;
res = team->ops.receive(team, port, skb);
if (res == RX_HANDLER_ANOTHER) {
struct team_pcpu_stats *pcpu_stats;
pcpu_stats = this_cpu_ptr(team->pcpu_stats);
u64_stats_update_begin(&pcpu_stats->syncp);
pcpu_stats->rx_packets++;
pcpu_stats->rx_bytes += skb->len;
if (skb->pkt_type == PACKET_MULTICAST)
pcpu_stats->rx_multicast++;
u64_stats_update_end(&pcpu_stats->syncp);
skb->dev = team->dev;
} else {
this_cpu_inc(team->pcpu_stats->rx_dropped);
}
return res;
}
/****************
* Port handling
****************/
static bool team_port_find(const struct team *team,
const struct team_port *port)
{
struct team_port *cur;
list_for_each_entry(cur, &team->port_list, list)
if (cur == port)
return true;
return false;
}
/*
* Add/delete port to the team port list. Write guarded by rtnl_lock.
* Takes care of correct port->index setup (might be racy).
*/
static void team_port_list_add_port(struct team *team,
struct team_port *port)
{
port->index = team->port_count++;
hlist_add_head_rcu(&port->hlist,
team_port_index_hash(team, port->index));
list_add_tail_rcu(&port->list, &team->port_list);
}
static void __reconstruct_port_hlist(struct team *team, int rm_index)
{
int i;
struct team_port *port;
for (i = rm_index + 1; i < team->port_count; i++) {
port = team_get_port_by_index(team, i);
hlist_del_rcu(&port->hlist);
port->index--;
hlist_add_head_rcu(&port->hlist,
team_port_index_hash(team, port->index));
}
}
static void team_port_list_del_port(struct team *team,
struct team_port *port)
{
int rm_index = port->index;
hlist_del_rcu(&port->hlist);
list_del_rcu(&port->list);
__reconstruct_port_hlist(team, rm_index);
team->port_count--;
}
#define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
NETIF_F_HIGHDMA | NETIF_F_LRO)
static void __team_compute_features(struct team *team)
{
struct team_port *port;
u32 vlan_features = TEAM_VLAN_FEATURES;
unsigned short max_hard_header_len = ETH_HLEN;
list_for_each_entry(port, &team->port_list, list) {
vlan_features = netdev_increment_features(vlan_features,
port->dev->vlan_features,
TEAM_VLAN_FEATURES);
if (port->dev->hard_header_len > max_hard_header_len)
max_hard_header_len = port->dev->hard_header_len;
}
team->dev->vlan_features = vlan_features;
team->dev->hard_header_len = max_hard_header_len;
netdev_change_features(team->dev);
}
static void team_compute_features(struct team *team)
{
mutex_lock(&team->lock);
__team_compute_features(team);
mutex_unlock(&team->lock);
}
static int team_port_enter(struct team *team, struct team_port *port)
{
int err = 0;
dev_hold(team->dev);
port->dev->priv_flags |= IFF_TEAM_PORT;
if (team->ops.port_enter) {
err = team->ops.port_enter(team, port);
if (err) {
netdev_err(team->dev, "Device %s failed to enter team mode\n",
port->dev->name);
goto err_port_enter;
}
}
return 0;
err_port_enter:
port->dev->priv_flags &= ~IFF_TEAM_PORT;
dev_put(team->dev);
return err;
}
static void team_port_leave(struct team *team, struct team_port *port)
{
if (team->ops.port_leave)
team->ops.port_leave(team, port);
port->dev->priv_flags &= ~IFF_TEAM_PORT;
dev_put(team->dev);
}
static void __team_port_change_check(struct team_port *port, bool linkup);
static int team_port_add(struct team *team, struct net_device *port_dev)
{
struct net_device *dev = team->dev;
struct team_port *port;
char *portname = port_dev->name;
int err;
if (port_dev->flags & IFF_LOOPBACK ||
port_dev->type != ARPHRD_ETHER) {
netdev_err(dev, "Device %s is of an unsupported type\n",
portname);
return -EINVAL;
}
if (team_port_exists(port_dev)) {
netdev_err(dev, "Device %s is already a port "
"of a team device\n", portname);
return -EBUSY;
}
if (port_dev->flags & IFF_UP) {
netdev_err(dev, "Device %s is up. Set it down before adding it as a team port\n",
portname);
return -EBUSY;
}
port = kzalloc(sizeof(struct team_port), GFP_KERNEL);
if (!port)
return -ENOMEM;
port->dev = port_dev;
port->team = team;
port->orig.mtu = port_dev->mtu;
err = dev_set_mtu(port_dev, dev->mtu);
if (err) {
netdev_dbg(dev, "Error %d calling dev_set_mtu\n", err);
goto err_set_mtu;
}
memcpy(port->orig.dev_addr, port_dev->dev_addr, ETH_ALEN);
err = team_port_enter(team, port);
if (err) {
netdev_err(dev, "Device %s failed to enter team mode\n",
portname);
goto err_port_enter;
}
err = dev_open(port_dev);
if (err) {
netdev_dbg(dev, "Device %s opening failed\n",
portname);
goto err_dev_open;
}
err = vlan_vids_add_by_dev(port_dev, dev);
if (err) {
netdev_err(dev, "Failed to add vlan ids to device %s\n",
portname);
goto err_vids_add;
}
err = netdev_set_master(port_dev, dev);
if (err) {
netdev_err(dev, "Device %s failed to set master\n", portname);
goto err_set_master;
}
err = netdev_rx_handler_register(port_dev, team_handle_frame,
port);
if (err) {
netdev_err(dev, "Device %s failed to register rx_handler\n",
portname);
goto err_handler_register;
}
team_port_list_add_port(team, port);
team_adjust_ops(team);
__team_compute_features(team);
__team_port_change_check(port, !!netif_carrier_ok(port_dev));
netdev_info(dev, "Port device %s added\n", portname);
return 0;
err_handler_register:
netdev_set_master(port_dev, NULL);
err_set_master:
vlan_vids_del_by_dev(port_dev, dev);
err_vids_add:
dev_close(port_dev);
err_dev_open:
team_port_leave(team, port);
team_port_set_orig_mac(port);
err_port_enter:
dev_set_mtu(port_dev, port->orig.mtu);
err_set_mtu:
kfree(port);
return err;
}
static int team_port_del(struct team *team, struct net_device *port_dev)
{
struct net_device *dev = team->dev;
struct team_port *port;
char *portname = port_dev->name;
port = team_port_get_rtnl(port_dev);
if (!port || !team_port_find(team, port)) {
netdev_err(dev, "Device %s does not act as a port of this team\n",
portname);
return -ENOENT;
}
port->removed = true;
__team_port_change_check(port, false);
team_port_list_del_port(team, port);
team_adjust_ops(team);
netdev_rx_handler_unregister(port_dev);
netdev_set_master(port_dev, NULL);
vlan_vids_del_by_dev(port_dev, dev);
dev_close(port_dev);
team_port_leave(team, port);
team_port_set_orig_mac(port);
dev_set_mtu(port_dev, port->orig.mtu);
synchronize_rcu();
kfree(port);
netdev_info(dev, "Port device %s removed\n", portname);
__team_compute_features(team);
return 0;
}
/*****************
* Net device ops
*****************/
static const char team_no_mode_kind[] = "*NOMODE*";
static int team_mode_option_get(struct team *team, void *arg)
{
const char **str = arg;
*str = team->mode ? team->mode->kind : team_no_mode_kind;
return 0;
}
static int team_mode_option_set(struct team *team, void *arg)
{
const char **str = arg;
return team_change_mode(team, *str);
}
static const struct team_option team_options[] = {
{
.name = "mode",
.type = TEAM_OPTION_TYPE_STRING,
.getter = team_mode_option_get,
.setter = team_mode_option_set,
},
};
static int team_init(struct net_device *dev)
{
struct team *team = netdev_priv(dev);
int i;
int err;
team->dev = dev;
mutex_init(&team->lock);
team->pcpu_stats = alloc_percpu(struct team_pcpu_stats);
if (!team->pcpu_stats)
return -ENOMEM;
for (i = 0; i < TEAM_PORT_HASHENTRIES; i++)
INIT_HLIST_HEAD(&team->port_hlist[i]);
INIT_LIST_HEAD(&team->port_list);
team_adjust_ops(team);
INIT_LIST_HEAD(&team->option_list);
err = team_options_register(team, team_options, ARRAY_SIZE(team_options));
if (err)
goto err_options_register;
netif_carrier_off(dev);
return 0;
err_options_register:
free_percpu(team->pcpu_stats);
return err;
}
static void team_uninit(struct net_device *dev)
{
struct team *team = netdev_priv(dev);
struct team_port *port;
struct team_port *tmp;
mutex_lock(&team->lock);
list_for_each_entry_safe(port, tmp, &team->port_list, list)
team_port_del(team, port->dev);
__team_change_mode(team, NULL); /* cleanup */
__team_options_unregister(team, team_options, ARRAY_SIZE(team_options));
mutex_unlock(&team->lock);
}
static void team_destructor(struct net_device *dev)
{
struct team *team = netdev_priv(dev);
free_percpu(team->pcpu_stats);
free_netdev(dev);
}
static int team_open(struct net_device *dev)
{
netif_carrier_on(dev);
return 0;
}
static int team_close(struct net_device *dev)
{
netif_carrier_off(dev);
return 0;
}
/*
* note: already called with rcu_read_lock
*/
static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct team *team = netdev_priv(dev);
bool tx_success = false;
unsigned int len = skb->len;
tx_success = team->ops.transmit(team, skb);
if (tx_success) {
struct team_pcpu_stats *pcpu_stats;
pcpu_stats = this_cpu_ptr(team->pcpu_stats);
u64_stats_update_begin(&pcpu_stats->syncp);
pcpu_stats->tx_packets++;
pcpu_stats->tx_bytes += len;
u64_stats_update_end(&pcpu_stats->syncp);
} else {
this_cpu_inc(team->pcpu_stats->tx_dropped);
}
return NETDEV_TX_OK;
}
static void team_change_rx_flags(struct net_device *dev, int change)
{
struct team *team = netdev_priv(dev);
struct team_port *port;
int inc;
rcu_read_lock();
list_for_each_entry_rcu(port, &team->port_list, list) {
if (change & IFF_PROMISC) {
inc = dev->flags & IFF_PROMISC ? 1 : -1;
dev_set_promiscuity(port->dev, inc);
}
if (change & IFF_ALLMULTI) {
inc = dev->flags & IFF_ALLMULTI ? 1 : -1;
dev_set_allmulti(port->dev, inc);
}
}
rcu_read_unlock();
}
static void team_set_rx_mode(struct net_device *dev)
{
struct team *team = netdev_priv(dev);
struct team_port *port;
rcu_read_lock();
list_for_each_entry_rcu(port, &team->port_list, list) {
dev_uc_sync(port->dev, dev);
dev_mc_sync(port->dev, dev);
}
rcu_read_unlock();
}
static int team_set_mac_address(struct net_device *dev, void *p)
{
struct team *team = netdev_priv(dev);
struct team_port *port;
struct sockaddr *addr = p;
memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
rcu_read_lock();
list_for_each_entry_rcu(port, &team->port_list, list)
if (team->ops.port_change_mac)
team->ops.port_change_mac(team, port);
rcu_read_unlock();
return 0;
}
static int team_change_mtu(struct net_device *dev, int new_mtu)
{
struct team *team = netdev_priv(dev);
struct team_port *port;
int err;
/*
* Alhough this is reader, it's guarded by team lock. It's not possible
* to traverse list in reverse under rcu_read_lock
*/
mutex_lock(&team->lock);
list_for_each_entry(port, &team->port_list, list) {
err = dev_set_mtu(port->dev, new_mtu);
if (err) {
netdev_err(dev, "Device %s failed to change mtu",
port->dev->name);
goto unwind;
}
}
mutex_unlock(&team->lock);
dev->mtu = new_mtu;
return 0;
unwind:
list_for_each_entry_continue_reverse(port, &team->port_list, list)
dev_set_mtu(port->dev, dev->mtu);
mutex_unlock(&team->lock);
return err;
}
static struct rtnl_link_stats64 *
team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
{
struct team *team = netdev_priv(dev);
struct team_pcpu_stats *p;
u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
u32 rx_dropped = 0, tx_dropped = 0;
unsigned int start;
int i;
for_each_possible_cpu(i) {
p = per_cpu_ptr(team->pcpu_stats, i);
do {
start = u64_stats_fetch_begin_bh(&p->syncp);
rx_packets = p->rx_packets;
rx_bytes = p->rx_bytes;
rx_multicast = p->rx_multicast;
tx_packets = p->tx_packets;
tx_bytes = p->tx_bytes;
} while (u64_stats_fetch_retry_bh(&p->syncp, start));
stats->rx_packets += rx_packets;
stats->rx_bytes += rx_bytes;
stats->multicast += rx_multicast;
stats->tx_packets += tx_packets;
stats->tx_bytes += tx_bytes;
/*
* rx_dropped & tx_dropped are u32, updated
* without syncp protection.
*/
rx_dropped += p->rx_dropped;
tx_dropped += p->tx_dropped;
}
stats->rx_dropped = rx_dropped;
stats->tx_dropped = tx_dropped;
return stats;
}
static int team_vlan_rx_add_vid(struct net_device *dev, uint16_t vid)
{
struct team *team = netdev_priv(dev);
struct team_port *port;
int err;
/*
* Alhough this is reader, it's guarded by team lock. It's not possible
* to traverse list in reverse under rcu_read_lock
*/
mutex_lock(&team->lock);
list_for_each_entry(port, &team->port_list, list) {
err = vlan_vid_add(port->dev, vid);
if (err)
goto unwind;
}
mutex_unlock(&team->lock);
return 0;
unwind:
list_for_each_entry_continue_reverse(port, &team->port_list, list)
vlan_vid_del(port->dev, vid);
mutex_unlock(&team->lock);
return err;
}
static int team_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
{
struct team *team = netdev_priv(dev);
struct team_port *port;
rcu_read_lock();
list_for_each_entry_rcu(port, &team->port_list, list)
vlan_vid_del(port->dev, vid);
rcu_read_unlock();
return 0;
}
static int team_add_slave(struct net_device *dev, struct net_device *port_dev)
{
struct team *team = netdev_priv(dev);
int err;
mutex_lock(&team->lock);
err = team_port_add(team, port_dev);
mutex_unlock(&team->lock);
return err;
}
static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
{
struct team *team = netdev_priv(dev);
int err;
mutex_lock(&team->lock);
err = team_port_del(team, port_dev);
mutex_unlock(&team->lock);
return err;
}
static netdev_features_t team_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct team_port *port;
struct team *team = netdev_priv(dev);
netdev_features_t mask;
mask = features;
features &= ~NETIF_F_ONE_FOR_ALL;
features |= NETIF_F_ALL_FOR_ALL;
rcu_read_lock();
list_for_each_entry_rcu(port, &team->port_list, list) {
features = netdev_increment_features(features,
port->dev->features,
mask);
}
rcu_read_unlock();
return features;
}
static const struct net_device_ops team_netdev_ops = {
.ndo_init = team_init,
.ndo_uninit = team_uninit,
.ndo_open = team_open,
.ndo_stop = team_close,
.ndo_start_xmit = team_xmit,
.ndo_change_rx_flags = team_change_rx_flags,
.ndo_set_rx_mode = team_set_rx_mode,
.ndo_set_mac_address = team_set_mac_address,
.ndo_change_mtu = team_change_mtu,
.ndo_get_stats64 = team_get_stats64,
.ndo_vlan_rx_add_vid = team_vlan_rx_add_vid,
.ndo_vlan_rx_kill_vid = team_vlan_rx_kill_vid,
.ndo_add_slave = team_add_slave,
.ndo_del_slave = team_del_slave,
.ndo_fix_features = team_fix_features,
};
/***********************
* rt netlink interface
***********************/
static void team_setup(struct net_device *dev)
{
ether_setup(dev);
dev->netdev_ops = &team_netdev_ops;
dev->destructor = team_destructor;
dev->tx_queue_len = 0;
dev->flags |= IFF_MULTICAST;
dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
/*
* Indicate we support unicast address filtering. That way core won't
* bring us to promisc mode in case a unicast addr is added.
* Let this up to underlay drivers.
*/
dev->priv_flags |= IFF_UNICAST_FLT;
dev->features |= NETIF_F_LLTX;
dev->features |= NETIF_F_GRO;
dev->hw_features = NETIF_F_HW_VLAN_TX |
NETIF_F_HW_VLAN_RX |
NETIF_F_HW_VLAN_FILTER;
dev->features |= dev->hw_features;
}
static int team_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
int err;
if (tb[IFLA_ADDRESS] == NULL)
random_ether_addr(dev->dev_addr);
err = register_netdevice(dev);
if (err)
return err;
return 0;
}
static int team_validate(struct nlattr *tb[], struct nlattr *data[])
{
if (tb[IFLA_ADDRESS]) {
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
return -EINVAL;
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
return -EADDRNOTAVAIL;
}
return 0;
}
static struct rtnl_link_ops team_link_ops __read_mostly = {
.kind = DRV_NAME,
.priv_size = sizeof(struct team),
.setup = team_setup,
.newlink = team_newlink,
.validate = team_validate,
};
/***********************************
* Generic netlink custom interface
***********************************/
static struct genl_family team_nl_family = {
.id = GENL_ID_GENERATE,
.name = TEAM_GENL_NAME,
.version = TEAM_GENL_VERSION,
.maxattr = TEAM_ATTR_MAX,
.netnsok = true,
};
static const struct nla_policy team_nl_policy[TEAM_ATTR_MAX + 1] = {
[TEAM_ATTR_UNSPEC] = { .type = NLA_UNSPEC, },
[TEAM_ATTR_TEAM_IFINDEX] = { .type = NLA_U32 },
[TEAM_ATTR_LIST_OPTION] = { .type = NLA_NESTED },
[TEAM_ATTR_LIST_PORT] = { .type = NLA_NESTED },
};
static const struct nla_policy
team_nl_option_policy[TEAM_ATTR_OPTION_MAX + 1] = {
[TEAM_ATTR_OPTION_UNSPEC] = { .type = NLA_UNSPEC, },
[TEAM_ATTR_OPTION_NAME] = {
.type = NLA_STRING,
.len = TEAM_STRING_MAX_LEN,
},
[TEAM_ATTR_OPTION_CHANGED] = { .type = NLA_FLAG },
[TEAM_ATTR_OPTION_TYPE] = { .type = NLA_U8 },
[TEAM_ATTR_OPTION_DATA] = {
.type = NLA_BINARY,
.len = TEAM_STRING_MAX_LEN,
},
};
static int team_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *msg;
void *hdr;
int err;
msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
&team_nl_family, 0, TEAM_CMD_NOOP);
if (IS_ERR(hdr)) {
err = PTR_ERR(hdr);
goto err_msg_put;
}
genlmsg_end(msg, hdr);
return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
err_msg_put:
nlmsg_free(msg);
return err;
}
/*
* Netlink cmd functions should be locked by following two functions.
* Since dev gets held here, that ensures dev won't disappear in between.
*/
static struct team *team_nl_team_get(struct genl_info *info)
{
struct net *net = genl_info_net(info);
int ifindex;
struct net_device *dev;
struct team *team;
if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX])
return NULL;
ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]);
dev = dev_get_by_index(net, ifindex);
if (!dev || dev->netdev_ops != &team_netdev_ops) {
if (dev)
dev_put(dev);
return NULL;
}
team = netdev_priv(dev);
mutex_lock(&team->lock);
return team;
}
static void team_nl_team_put(struct team *team)
{
mutex_unlock(&team->lock);
dev_put(team->dev);
}
static int team_nl_send_generic(struct genl_info *info, struct team *team,
int (*fill_func)(struct sk_buff *skb,
struct genl_info *info,
int flags, struct team *team))
{
struct sk_buff *skb;
int err;
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOMEM;
err = fill_func(skb, info, NLM_F_ACK, team);
if (err < 0)
goto err_fill;
err = genlmsg_unicast(genl_info_net(info), skb, info->snd_pid);
return err;
err_fill:
nlmsg_free(skb);
return err;
}
static int team_nl_fill_options_get(struct sk_buff *skb,
u32 pid, u32 seq, int flags,
struct team *team, bool fillall)
{
struct nlattr *option_list;
void *hdr;
struct team_option *option;
hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
TEAM_CMD_OPTIONS_GET);
if (IS_ERR(hdr))
return PTR_ERR(hdr);
NLA_PUT_U32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex);
option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
if (!option_list)
return -EMSGSIZE;
list_for_each_entry(option, &team->option_list, list) {
struct nlattr *option_item;
long arg;
/* Include only changed options if fill all mode is not on */
if (!fillall && !option->changed)
continue;
option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
if (!option_item)
goto nla_put_failure;
NLA_PUT_STRING(skb, TEAM_ATTR_OPTION_NAME, option->name);
if (option->changed) {
NLA_PUT_FLAG(skb, TEAM_ATTR_OPTION_CHANGED);
option->changed = false;
}
if (option->removed)
NLA_PUT_FLAG(skb, TEAM_ATTR_OPTION_REMOVED);
switch (option->type) {
case TEAM_OPTION_TYPE_U32:
NLA_PUT_U8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32);
team_option_get(team, option, &arg);
NLA_PUT_U32(skb, TEAM_ATTR_OPTION_DATA, arg);
break;
case TEAM_OPTION_TYPE_STRING:
NLA_PUT_U8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING);
team_option_get(team, option, &arg);
NLA_PUT_STRING(skb, TEAM_ATTR_OPTION_DATA,
(char *) arg);
break;
default:
BUG();
}
nla_nest_end(skb, option_item);
}
nla_nest_end(skb, option_list);
return genlmsg_end(skb, hdr);
nla_put_failure:
genlmsg_cancel(skb, hdr);
return -EMSGSIZE;
}
static int team_nl_fill_options_get_all(struct sk_buff *skb,
struct genl_info *info, int flags,
struct team *team)
{
return team_nl_fill_options_get(skb, info->snd_pid,
info->snd_seq, NLM_F_ACK,
team, true);
}
static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info)
{
struct team *team;
int err;
team = team_nl_team_get(info);
if (!team)
return -EINVAL;
err = team_nl_send_generic(info, team, team_nl_fill_options_get_all);
team_nl_team_put(team);
return err;
}
static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
{
struct team *team;
int err = 0;
int i;
struct nlattr *nl_option;
team = team_nl_team_get(info);
if (!team)
return -EINVAL;
err = -EINVAL;
if (!info->attrs[TEAM_ATTR_LIST_OPTION]) {
err = -EINVAL;
goto team_put;
}
nla_for_each_nested(nl_option, info->attrs[TEAM_ATTR_LIST_OPTION], i) {
struct nlattr *mode_attrs[TEAM_ATTR_OPTION_MAX + 1];
enum team_option_type opt_type;
struct team_option *option;
char *opt_name;
bool opt_found = false;
if (nla_type(nl_option) != TEAM_ATTR_ITEM_OPTION) {
err = -EINVAL;
goto team_put;
}
err = nla_parse_nested(mode_attrs, TEAM_ATTR_OPTION_MAX,
nl_option, team_nl_option_policy);
if (err)
goto team_put;
if (!mode_attrs[TEAM_ATTR_OPTION_NAME] ||
!mode_attrs[TEAM_ATTR_OPTION_TYPE] ||
!mode_attrs[TEAM_ATTR_OPTION_DATA]) {
err = -EINVAL;
goto team_put;
}
switch (nla_get_u8(mode_attrs[TEAM_ATTR_OPTION_TYPE])) {
case NLA_U32:
opt_type = TEAM_OPTION_TYPE_U32;
break;
case NLA_STRING:
opt_type = TEAM_OPTION_TYPE_STRING;
break;
default:
goto team_put;
}
opt_name = nla_data(mode_attrs[TEAM_ATTR_OPTION_NAME]);
list_for_each_entry(option, &team->option_list, list) {
long arg;
struct nlattr *opt_data_attr;
if (option->type != opt_type ||
strcmp(option->name, opt_name))
continue;
opt_found = true;
opt_data_attr = mode_attrs[TEAM_ATTR_OPTION_DATA];
switch (opt_type) {
case TEAM_OPTION_TYPE_U32:
arg = nla_get_u32(opt_data_attr);
break;
case TEAM_OPTION_TYPE_STRING:
arg = (long) nla_data(opt_data_attr);
break;
default:
BUG();
}
err = team_option_set(team, option, &arg);
if (err)
goto team_put;
}
if (!opt_found) {
err = -ENOENT;
goto team_put;
}
}
team_put:
team_nl_team_put(team);
return err;
}
static int team_nl_fill_port_list_get(struct sk_buff *skb,
u32 pid, u32 seq, int flags,
struct team *team,
bool fillall)
{
struct nlattr *port_list;
void *hdr;
struct team_port *port;
hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
TEAM_CMD_PORT_LIST_GET);
if (IS_ERR(hdr))
return PTR_ERR(hdr);
NLA_PUT_U32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex);
port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
if (!port_list)
return -EMSGSIZE;
list_for_each_entry(port, &team->port_list, list) {
struct nlattr *port_item;
/* Include only changed ports if fill all mode is not on */
if (!fillall && !port->changed)
continue;
port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT);
if (!port_item)
goto nla_put_failure;
NLA_PUT_U32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex);
if (port->changed) {
NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_CHANGED);
port->changed = false;
}
if (port->removed)
NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_REMOVED);
if (port->linkup)
NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_LINKUP);
NLA_PUT_U32(skb, TEAM_ATTR_PORT_SPEED, port->speed);
NLA_PUT_U8(skb, TEAM_ATTR_PORT_DUPLEX, port->duplex);
nla_nest_end(skb, port_item);
}
nla_nest_end(skb, port_list);
return genlmsg_end(skb, hdr);
nla_put_failure:
genlmsg_cancel(skb, hdr);
return -EMSGSIZE;
}
static int team_nl_fill_port_list_get_all(struct sk_buff *skb,
struct genl_info *info, int flags,
struct team *team)
{
return team_nl_fill_port_list_get(skb, info->snd_pid,
info->snd_seq, NLM_F_ACK,
team, true);
}
static int team_nl_cmd_port_list_get(struct sk_buff *skb,
struct genl_info *info)
{
struct team *team;
int err;
team = team_nl_team_get(info);
if (!team)
return -EINVAL;
err = team_nl_send_generic(info, team, team_nl_fill_port_list_get_all);
team_nl_team_put(team);
return err;
}
static struct genl_ops team_nl_ops[] = {
{
.cmd = TEAM_CMD_NOOP,
.doit = team_nl_cmd_noop,
.policy = team_nl_policy,
},
{
.cmd = TEAM_CMD_OPTIONS_SET,
.doit = team_nl_cmd_options_set,
.policy = team_nl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = TEAM_CMD_OPTIONS_GET,
.doit = team_nl_cmd_options_get,
.policy = team_nl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = TEAM_CMD_PORT_LIST_GET,
.doit = team_nl_cmd_port_list_get,
.policy = team_nl_policy,
.flags = GENL_ADMIN_PERM,
},
};
static struct genl_multicast_group team_change_event_mcgrp = {
.name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME,
};
static int team_nl_send_event_options_get(struct team *team)
{
struct sk_buff *skb;
int err;
struct net *net = dev_net(team->dev);
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOMEM;
err = team_nl_fill_options_get(skb, 0, 0, 0, team, false);
if (err < 0)
goto err_fill;
err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
GFP_KERNEL);
return err;
err_fill:
nlmsg_free(skb);
return err;
}
static int team_nl_send_event_port_list_get(struct team *team)
{
struct sk_buff *skb;
int err;
struct net *net = dev_net(team->dev);
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOMEM;
err = team_nl_fill_port_list_get(skb, 0, 0, 0, team, false);
if (err < 0)
goto err_fill;
err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
GFP_KERNEL);
return err;
err_fill:
nlmsg_free(skb);
return err;
}
static int team_nl_init(void)
{
int err;
err = genl_register_family_with_ops(&team_nl_family, team_nl_ops,
ARRAY_SIZE(team_nl_ops));
if (err)
return err;
err = genl_register_mc_group(&team_nl_family, &team_change_event_mcgrp);
if (err)
goto err_change_event_grp_reg;
return 0;
err_change_event_grp_reg:
genl_unregister_family(&team_nl_family);
return err;
}
static void team_nl_fini(void)
{
genl_unregister_family(&team_nl_family);
}
/******************
* Change checkers
******************/
static void __team_options_change_check(struct team *team)
{
int err;
err = team_nl_send_event_options_get(team);
if (err)
netdev_warn(team->dev, "Failed to send options change via netlink\n");
}
/* rtnl lock is held */
static void __team_port_change_check(struct team_port *port, bool linkup)
{
int err;
if (!port->removed && port->linkup == linkup)
return;
port->changed = true;
port->linkup = linkup;
if (linkup) {
struct ethtool_cmd ecmd;
err = __ethtool_get_settings(port->dev, &ecmd);
if (!err) {
port->speed = ethtool_cmd_speed(&ecmd);
port->duplex = ecmd.duplex;
goto send_event;
}
}
port->speed = 0;
port->duplex = 0;
send_event:
err = team_nl_send_event_port_list_get(port->team);
if (err)
netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink\n",
port->dev->name);
}
static void team_port_change_check(struct team_port *port, bool linkup)
{
struct team *team = port->team;
mutex_lock(&team->lock);
__team_port_change_check(port, linkup);
mutex_unlock(&team->lock);
}
/************************************
* Net device notifier event handler
************************************/
static int team_device_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = (struct net_device *) ptr;
struct team_port *port;
port = team_port_get_rtnl(dev);
if (!port)
return NOTIFY_DONE;
switch (event) {
case NETDEV_UP:
if (netif_carrier_ok(dev))
team_port_change_check(port, true);
case NETDEV_DOWN:
team_port_change_check(port, false);
case NETDEV_CHANGE:
if (netif_running(port->dev))
team_port_change_check(port,
!!netif_carrier_ok(port->dev));
break;
case NETDEV_UNREGISTER:
team_del_slave(port->team->dev, dev);
break;
case NETDEV_FEAT_CHANGE:
team_compute_features(port->team);
break;
case NETDEV_CHANGEMTU:
/* Forbid to change mtu of underlaying device */
return NOTIFY_BAD;
case NETDEV_PRE_TYPE_CHANGE:
/* Forbid to change type of underlaying device */
return NOTIFY_BAD;
}
return NOTIFY_DONE;
}
static struct notifier_block team_notifier_block __read_mostly = {
.notifier_call = team_device_event,
};
/***********************
* Module init and exit
***********************/
static int __init team_module_init(void)
{
int err;
register_netdevice_notifier(&team_notifier_block);
err = rtnl_link_register(&team_link_ops);
if (err)
goto err_rtnl_reg;
err = team_nl_init();
if (err)
goto err_nl_init;
return 0;
err_nl_init:
rtnl_link_unregister(&team_link_ops);
err_rtnl_reg:
unregister_netdevice_notifier(&team_notifier_block);
return err;
}
static void __exit team_module_exit(void)
{
team_nl_fini();
rtnl_link_unregister(&team_link_ops);
unregister_netdevice_notifier(&team_notifier_block);
}
module_init(team_module_init);
module_exit(team_module_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
MODULE_DESCRIPTION("Ethernet team device driver");
MODULE_ALIAS_RTNL_LINK(DRV_NAME);