team.c

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/*
 * drivers/net/team/team.c - Network team device driver
 * Copyright (c) 2011 Jiri Pirko <[email protected]>
 *
 * 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/netpoll.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 <net/sch_generic.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 device 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_dev_addr(struct net_device *port_dev,
                   const unsigned char *dev_addr)
{
    struct sockaddr addr;

    memcpy(addr.sa_data, dev_addr, port_dev->addr_len);
    addr.sa_family = port_dev->type;
    return dev_set_mac_address(port_dev, &addr);
}

static int team_port_set_orig_dev_addr(struct team_port *port)
{
    return __set_port_dev_addr(port->dev, port->orig.dev_addr);
}

int team_port_set_team_dev_addr(struct team_port *port)
{
    return __set_port_dev_addr(port->dev, port->team->dev->dev_addr);
}
EXPORT_SYMBOL(team_port_set_team_dev_addr);

static void team_refresh_port_linkup(struct team_port *port)
{
    port->linkup = port->user.linkup_enabled ? port->user.linkup :
                           port->state.linkup;
}


/*******************
 * Options handling
 *******************/

struct team_option_inst { /* One for each option instance */
    struct list_head list;
    struct list_head tmp_list;
    struct team_option *option;
    struct team_option_inst_info info;
    bool changed;
    bool removed;
};

static 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;
}

static void __team_option_inst_del(struct team_option_inst *opt_inst)
{
    list_del(&opt_inst->list);
    kfree(opt_inst);
}

static void __team_option_inst_del_option(struct team *team,
                      struct team_option *option)
{
    struct team_option_inst *opt_inst, *tmp;

    list_for_each_entry_safe(opt_inst, tmp, &team->option_inst_list, list) {
        if (opt_inst->option == option)
            __team_option_inst_del(opt_inst);
    }
}

static int __team_option_inst_add(struct team *team, struct team_option *option,
                  struct team_port *port)
{
    struct team_option_inst *opt_inst;
    unsigned int array_size;
    unsigned int i;
    int err;

    array_size = option->array_size;
    if (!array_size)
        array_size = 1; /* No array but still need one instance */

    for (i = 0; i < array_size; i++) {
        opt_inst = kmalloc(sizeof(*opt_inst), GFP_KERNEL);
        if (!opt_inst)
            return -ENOMEM;
        opt_inst->option = option;
        opt_inst->info.port = port;
        opt_inst->info.array_index = i;
        opt_inst->changed = true;
        opt_inst->removed = false;
        list_add_tail(&opt_inst->list, &team->option_inst_list);
        if (option->init) {
            err = option->init(team, &opt_inst->info);
            if (err)
                return err;
        }

    }
    return 0;
}

static int __team_option_inst_add_option(struct team *team,
                     struct team_option *option)
{
    struct team_port *port;
    int err;

    if (!option->per_port) {
        err = __team_option_inst_add(team, option, NULL);
        if (err)
            goto inst_del_option;
    }

    list_for_each_entry(port, &team->port_list, list) {
        err = __team_option_inst_add(team, option, port);
        if (err)
            goto inst_del_option;
    }
    return 0;

inst_del_option:
    __team_option_inst_del_option(team, option);
    return err;
}

static void __team_option_inst_mark_removed_option(struct team *team,
                           struct team_option *option)
{
    struct team_option_inst *opt_inst;

    list_for_each_entry(opt_inst, &team->option_inst_list, list) {
        if (opt_inst->option == option) {
            opt_inst->changed = true;
            opt_inst->removed = true;
        }
    }
}

static void __team_option_inst_del_port(struct team *team,
                    struct team_port *port)
{
    struct team_option_inst *opt_inst, *tmp;

    list_for_each_entry_safe(opt_inst, tmp, &team->option_inst_list, list) {
        if (opt_inst->option->per_port &&
            opt_inst->info.port == port)
            __team_option_inst_del(opt_inst);
    }
}

static int __team_option_inst_add_port(struct team *team,
                       struct team_port *port)
{
    struct team_option *option;
    int err;

    list_for_each_entry(option, &team->option_list, list) {
        if (!option->per_port)
            continue;
        err = __team_option_inst_add(team, option, port);
        if (err)
            goto inst_del_port;
    }
    return 0;

inst_del_port:
    __team_option_inst_del_port(team, port);
    return err;
}

static void __team_option_inst_mark_removed_port(struct team *team,
                         struct team_port *port)
{
    struct team_option_inst *opt_inst;

    list_for_each_entry(opt_inst, &team->option_inst_list, list) {
        if (opt_inst->info.port == port) {
            opt_inst->changed = true;
            opt_inst->removed = true;
        }
    }
}

static 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 alloc_rollback;
        }
        dst_opts[i] = kmemdup(option, sizeof(*option), GFP_KERNEL);
        if (!dst_opts[i]) {
            err = -ENOMEM;
            goto alloc_rollback;
        }
    }

    for (i = 0; i < option_count; i++) {
        err = __team_option_inst_add_option(team, dst_opts[i]);
        if (err)
            goto inst_rollback;
        list_add_tail(&dst_opts[i]->list, &team->option_list);
    }

    kfree(dst_opts);
    return 0;

inst_rollback:
    for (i--; i >= 0; i--)
        __team_option_inst_del_option(team, dst_opts[i]);

    i = option_count - 1;
alloc_rollback:
    for (i--; i >= 0; 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)
            __team_option_inst_mark_removed_option(team, del_opt);
    }
}

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) {
            __team_option_inst_del_option(team, 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_inst *opt_inst,
               struct team_gsetter_ctx *ctx)
{
    if (!opt_inst->option->getter)
        return -EOPNOTSUPP;
    return opt_inst->option->getter(team, ctx);
}

static int team_option_set(struct team *team,
               struct team_option_inst *opt_inst,
               struct team_gsetter_ctx *ctx)
{
    if (!opt_inst->option->setter)
        return -EOPNOTSUPP;
    return opt_inst->option->setter(team, ctx);
}

void team_option_inst_set_change(struct team_option_inst_info *opt_inst_info)
{
    struct team_option_inst *opt_inst;

    opt_inst = container_of(opt_inst_info, struct team_option_inst, info);
    opt_inst->changed = true;
}
EXPORT_SYMBOL(team_option_inst_set_change);

void team_options_change_check(struct team *team)
{
    __team_options_change_check(team);
}
EXPORT_SYMBOL(team_options_change_check);


/****************
 * Mode handling
 ****************/

static LIST_HEAD(mode_list);
static DEFINE_SPINLOCK(mode_list_lock);

struct team_mode_item {
    struct list_head list;
    const struct team_mode *mode;
};

static struct team_mode_item *__find_mode(const char *kind)
{
    struct team_mode_item *mitem;

    list_for_each_entry(mitem, &mode_list, list) {
        if (strcmp(mitem->mode->kind, kind) == 0)
            return mitem;
    }
    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(const struct team_mode *mode)
{
    int err = 0;
    struct team_mode_item *mitem;

    if (!is_good_mode_name(mode->kind) ||
        mode->priv_size > TEAM_MODE_PRIV_SIZE)
        return -EINVAL;

    mitem = kmalloc(sizeof(*mitem), GFP_KERNEL);
    if (!mitem)
        return -ENOMEM;

    spin_lock(&mode_list_lock);
    if (__find_mode(mode->kind)) {
        err = -EEXIST;
        kfree(mitem);
        goto unlock;
    }
    mitem->mode = mode;
    list_add_tail(&mitem->list, &mode_list);
unlock:
    spin_unlock(&mode_list_lock);
    return err;
}
EXPORT_SYMBOL(team_mode_register);

void team_mode_unregister(const struct team_mode *mode)
{
    struct team_mode_item *mitem;

    spin_lock(&mode_list_lock);
    mitem = __find_mode(mode->kind);
    if (mitem) {
        list_del_init(&mitem->list);
        kfree(mitem);
    }
    spin_unlock(&mode_list_lock);
}
EXPORT_SYMBOL(team_mode_unregister);

static const struct team_mode *team_mode_get(const char *kind)
{
    struct team_mode_item *mitem;
    const struct team_mode *mode = NULL;

    spin_lock(&mode_list_lock);
    mitem = __find_mode(kind);
    if (!mitem) {
        spin_unlock(&mode_list_lock);
        request_module("team-mode-%s", kind);
        spin_lock(&mode_list_lock);
        mitem = __find_mode(kind);
    }
    if (mitem) {
        mode = mitem->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 const struct team_mode __team_no_mode = {
    .kind       = "*NOMODE*",
};

static bool team_is_mode_set(struct team *team)
{
    return team->mode != &__team_no_mode;
}

static void team_set_no_mode(struct team *team)
{
    team->mode = &__team_no_mode;
}

static void __team_adjust_ops(struct team *team, int en_port_count)
{
    /*
     * To avoid checks in rx/tx skb paths, ensure here that non-null and
     * correct ops are always set.
     */

    if (!en_port_count || !team_is_mode_set(team) ||
        !team->mode->ops->transmit)
        team->ops.transmit = team_dummy_transmit;
    else
        team->ops.transmit = team->mode->ops->transmit;

    if (!en_port_count || !team_is_mode_set(team) ||
        !team->mode->ops->receive)
        team->ops.receive = team_dummy_receive;
    else
        team->ops.receive = team->mode->ops->receive;
}

static void team_adjust_ops(struct team *team)
{
    __team_adjust_ops(team, team->en_port_count);
}

/*
 * 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_is_mode_set(team)) {
        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_set_no_mode(team);
        /* 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)
{
    const 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_is_mode_set(team) && 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;
    if (!team_port_enabled(port)) {
        /* allow exact match delivery for disabled ports */
        res = RX_HANDLER_EXACT;
    } else {
        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;
}


/*************************************
 * Multiqueue Tx port select override
 *************************************/

static int team_queue_override_init(struct team *team)
{
    struct list_head *listarr;
    unsigned int queue_cnt = team->dev->num_tx_queues - 1;
    unsigned int i;

    if (!queue_cnt)
        return 0;
    listarr = kmalloc(sizeof(struct list_head) * queue_cnt, GFP_KERNEL);
    if (!listarr)
        return -ENOMEM;
    team->qom_lists = listarr;
    for (i = 0; i < queue_cnt; i++)
        INIT_LIST_HEAD(listarr++);
    return 0;
}

static void team_queue_override_fini(struct team *team)
{
    kfree(team->qom_lists);
}

static struct list_head *__team_get_qom_list(struct team *team, u16 queue_id)
{
    return &team->qom_lists[queue_id - 1];
}

/*
 * note: already called with rcu_read_lock
 */
static bool team_queue_override_transmit(struct team *team, struct sk_buff *skb)
{
    struct list_head *qom_list;
    struct team_port *port;

    if (!team->queue_override_enabled || !skb->queue_mapping)
        return false;
    qom_list = __team_get_qom_list(team, skb->queue_mapping);
    list_for_each_entry_rcu(port, qom_list, qom_list) {
        if (!team_dev_queue_xmit(team, port, skb))
            return true;
    }
    return false;
}

static void __team_queue_override_port_del(struct team *team,
                       struct team_port *port)
{
    list_del_rcu(&port->qom_list);
    synchronize_rcu();
    INIT_LIST_HEAD(&port->qom_list);
}

static bool team_queue_override_port_has_gt_prio_than(struct team_port *port,
                              struct team_port *cur)
{
    if (port->priority < cur->priority)
        return true;
    if (port->priority > cur->priority)
        return false;
    if (port->index < cur->index)
        return true;
    return false;
}

static void __team_queue_override_port_add(struct team *team,
                       struct team_port *port)
{
    struct team_port *cur;
    struct list_head *qom_list;
    struct list_head *node;

    if (!port->queue_id || !team_port_enabled(port))
        return;

    qom_list = __team_get_qom_list(team, port->queue_id);
    node = qom_list;
    list_for_each_entry(cur, qom_list, qom_list) {
        if (team_queue_override_port_has_gt_prio_than(port, cur))
            break;
        node = &cur->qom_list;
    }
    list_add_tail_rcu(&port->qom_list, node);
}

static void __team_queue_override_enabled_check(struct team *team)
{
    struct team_port *port;
    bool enabled = false;

    list_for_each_entry(port, &team->port_list, list) {
        if (!list_empty(&port->qom_list)) {
            enabled = true;
            break;
        }
    }
    if (enabled == team->queue_override_enabled)
        return;
    netdev_dbg(team->dev, "%s queue override\n",
           enabled ? "Enabling" : "Disabling");
    team->queue_override_enabled = enabled;
}

static void team_queue_override_port_refresh(struct team *team,
                         struct team_port *port)
{
    __team_queue_override_port_del(team, port);
    __team_queue_override_port_add(team, port);
    __team_queue_override_enabled_check(team);
}


/****************
 * 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;
}

/*
 * Enable/disable port by adding to enabled port hashlist and setting
 * port->index (Might be racy so reader could see incorrect ifindex when
 * processing a flying packet, but that is not a problem). Write guarded
 * by team->lock.
 */
static void team_port_enable(struct team *team,
                 struct team_port *port)
{
    if (team_port_enabled(port))
        return;
    port->index = team->en_port_count++;
    hlist_add_head_rcu(&port->hlist,
               team_port_index_hash(team, port->index));
    team_adjust_ops(team);
    team_queue_override_port_refresh(team, port);
    if (team->ops.port_enabled)
        team->ops.port_enabled(team, port);
}

static void __reconstruct_port_hlist(struct team *team, int rm_index)
{
    int i;
    struct team_port *port;

    for (i = rm_index + 1; i < team->en_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_disable(struct team *team,
                  struct team_port *port)
{
    if (!team_port_enabled(port))
        return;
    if (team->ops.port_disabled)
        team->ops.port_disabled(team, port);
    hlist_del_rcu(&port->hlist);
    __reconstruct_port_hlist(team, port->index);
    port->index = -1;
    team_queue_override_port_refresh(team, port);
    __team_adjust_ops(team, team->en_port_count - 1);
    /*
     * Wait until readers see adjusted ops. This ensures that
     * readers never see team->en_port_count == 0
     */
    synchronize_rcu();
    team->en_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;
    unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;

    list_for_each_entry(port, &team->port_list, list) {
        vlan_features = netdev_increment_features(vlan_features,
                    port->dev->vlan_features,
                    TEAM_VLAN_FEATURES);

        dst_release_flag &= port->dev->priv_flags;
        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;

    flags = team->dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
    team->dev->priv_flags = flags | dst_release_flag;

    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);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static int team_port_enable_netpoll(struct team *team, struct team_port *port,
                    gfp_t gfp)
{
    struct netpoll *np;
    int err;

    np = kzalloc(sizeof(*np), gfp);
    if (!np)
        return -ENOMEM;

    err = __netpoll_setup(np, port->dev, gfp);
    if (err) {
        kfree(np);
        return err;
    }
    port->np = np;
    return err;
}

static void team_port_disable_netpoll(struct team_port *port)
{
    struct netpoll *np = port->np;

    if (!np)
        return;
    port->np = NULL;

    /* Wait for transmitting packets to finish before freeing. */
    synchronize_rcu_bh();
    __netpoll_cleanup(np);
    kfree(np);
}

static struct netpoll_info *team_netpoll_info(struct team *team)
{
    return team->dev->npinfo;
}

#else
static int team_port_enable_netpoll(struct team *team, struct team_port *port,
                    gfp_t gfp)
{
    return 0;
}
static void team_port_disable_netpoll(struct team_port *port)
{
}
static struct netpoll_info *team_netpoll_info(struct team *team)
{
    return NULL;
}
#endif

static void __team_port_change_port_added(struct team_port *port, bool linkup);
static int team_dev_type_check_change(struct net_device *dev,
                      struct net_device *port_dev);

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) {
        netdev_err(dev, "Device %s is loopback device. Loopback devices can't be added as a team port\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->features & NETIF_F_VLAN_CHALLENGED &&
        vlan_uses_dev(dev)) {
        netdev_err(dev, "Device %s is VLAN challenged and team device has VLAN set up\n",
               portname);
        return -EPERM;
    }

    err = team_dev_type_check_change(dev, port_dev);
    if (err)
        return err;

    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) + team->mode->port_priv_size,
               GFP_KERNEL);
    if (!port)
        return -ENOMEM;

    port->dev = port_dev;
    port->team = team;
    INIT_LIST_HEAD(&port->qom_list);

    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, port_dev->addr_len);

    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;
    }

    if (team_netpoll_info(team)) {
        err = team_port_enable_netpoll(team, port, GFP_KERNEL);
        if (err) {
            netdev_err(dev, "Failed to enable netpoll on device %s\n",
                   portname);
            goto err_enable_netpoll;
        }
    }

    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;
    }

    err = __team_option_inst_add_port(team, port);
    if (err) {
        netdev_err(dev, "Device %s failed to add per-port options\n",
               portname);
        goto err_option_port_add;
    }

    port->index = -1;
    team_port_enable(team, port);
    list_add_tail_rcu(&port->list, &team->port_list);
    __team_compute_features(team);
    __team_port_change_port_added(port, !!netif_carrier_ok(port_dev));
    __team_options_change_check(team);

    netdev_info(dev, "Port device %s added\n", portname);

    return 0;

err_option_port_add:
    netdev_rx_handler_unregister(port_dev);

err_handler_register:
    netdev_set_master(port_dev, NULL);

err_set_master:
    team_port_disable_netpoll(port);

err_enable_netpoll:
    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_dev_addr(port);

err_port_enter:
    dev_set_mtu(port_dev, port->orig.mtu);

err_set_mtu:
    kfree(port);

    return err;
}

static void __team_port_change_port_removed(struct team_port *port);

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;
    }

    __team_option_inst_mark_removed_port(team, port);
    __team_options_change_check(team);
    __team_option_inst_del_port(team, port);
    __team_port_change_port_removed(port);
    team_port_disable(team, port);
    list_del_rcu(&port->list);
    netdev_rx_handler_unregister(port_dev);
    netdev_set_master(port_dev, NULL);
    team_port_disable_netpoll(port);
    vlan_vids_del_by_dev(port_dev, dev);
    dev_close(port_dev);
    team_port_leave(team, port);
    team_port_set_orig_dev_addr(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 int team_mode_option_get(struct team *team, struct team_gsetter_ctx *ctx)
{
    ctx->data.str_val = team->mode->kind;
    return 0;
}

static int team_mode_option_set(struct team *team, struct team_gsetter_ctx *ctx)
{
    return team_change_mode(team, ctx->data.str_val);
}

static int team_port_en_option_get(struct team *team,
                   struct team_gsetter_ctx *ctx)
{
    struct team_port *port = ctx->info->port;

    ctx->data.bool_val = team_port_enabled(port);
    return 0;
}

static int team_port_en_option_set(struct team *team,
                   struct team_gsetter_ctx *ctx)
{
    struct team_port *port = ctx->info->port;

    if (ctx->data.bool_val)
        team_port_enable(team, port);
    else
        team_port_disable(team, port);
    return 0;
}

static int team_user_linkup_option_get(struct team *team,
                       struct team_gsetter_ctx *ctx)
{
    struct team_port *port = ctx->info->port;

    ctx->data.bool_val = port->user.linkup;
    return 0;
}

static int team_user_linkup_option_set(struct team *team,
                       struct team_gsetter_ctx *ctx)
{
    struct team_port *port = ctx->info->port;

    port->user.linkup = ctx->data.bool_val;
    team_refresh_port_linkup(port);
    return 0;
}

static int team_user_linkup_en_option_get(struct team *team,
                      struct team_gsetter_ctx *ctx)
{
    struct team_port *port = ctx->info->port;

    ctx->data.bool_val = port->user.linkup_enabled;
    return 0;
}

static int team_user_linkup_en_option_set(struct team *team,
                      struct team_gsetter_ctx *ctx)
{
    struct team_port *port = ctx->info->port;

    port->user.linkup_enabled = ctx->data.bool_val;
    team_refresh_port_linkup(port);
    return 0;
}

static int team_priority_option_get(struct team *team,
                    struct team_gsetter_ctx *ctx)
{
    struct team_port *port = ctx->info->port;

    ctx->data.s32_val = port->priority;
    return 0;
}

static int team_priority_option_set(struct team *team,
                    struct team_gsetter_ctx *ctx)
{
    struct team_port *port = ctx->info->port;

    port->priority = ctx->data.s32_val;
    team_queue_override_port_refresh(team, port);
    return 0;
}

static int team_queue_id_option_get(struct team *team,
                    struct team_gsetter_ctx *ctx)
{
    struct team_port *port = ctx->info->port;

    ctx->data.u32_val = port->queue_id;
    return 0;
}

static int team_queue_id_option_set(struct team *team,
                    struct team_gsetter_ctx *ctx)
{
    struct team_port *port = ctx->info->port;

    if (port->queue_id == ctx->data.u32_val)
        return 0;
    if (ctx->data.u32_val >= team->dev->real_num_tx_queues)
        return -EINVAL;
    port->queue_id = ctx->data.u32_val;
    team_queue_override_port_refresh(team, port);
    return 0;
}


static const struct team_option team_options[] = {
    {
        .name = "mode",
        .type = TEAM_OPTION_TYPE_STRING,
        .getter = team_mode_option_get,
        .setter = team_mode_option_set,
    },
    {
        .name = "enabled",
        .type = TEAM_OPTION_TYPE_BOOL,
        .per_port = true,
        .getter = team_port_en_option_get,
        .setter = team_port_en_option_set,
    },
    {
        .name = "user_linkup",
        .type = TEAM_OPTION_TYPE_BOOL,
        .per_port = true,
        .getter = team_user_linkup_option_get,
        .setter = team_user_linkup_option_set,
    },
    {
        .name = "user_linkup_enabled",
        .type = TEAM_OPTION_TYPE_BOOL,
        .per_port = true,
        .getter = team_user_linkup_en_option_get,
        .setter = team_user_linkup_en_option_set,
    },
    {
        .name = "priority",
        .type = TEAM_OPTION_TYPE_S32,
        .per_port = true,
        .getter = team_priority_option_get,
        .setter = team_priority_option_set,
    },
    {
        .name = "queue_id",
        .type = TEAM_OPTION_TYPE_U32,
        .per_port = true,
        .getter = team_queue_id_option_get,
        .setter = team_queue_id_option_set,
    },
};

static struct lock_class_key team_netdev_xmit_lock_key;
static struct lock_class_key team_netdev_addr_lock_key;
static struct lock_class_key team_tx_busylock_key;

static void team_set_lockdep_class_one(struct net_device *dev,
                       struct netdev_queue *txq,
                       void *unused)
{
    lockdep_set_class(&txq->_xmit_lock, &team_netdev_xmit_lock_key);
}

static void team_set_lockdep_class(struct net_device *dev)
{
    lockdep_set_class(&dev->addr_list_lock, &team_netdev_addr_lock_key);
    netdev_for_each_tx_queue(dev, team_set_lockdep_class_one, NULL);
    dev->qdisc_tx_busylock = &team_tx_busylock_key;
}

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_set_no_mode(team);

    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->en_port_hlist[i]);
    INIT_LIST_HEAD(&team->port_list);
    err = team_queue_override_init(team);
    if (err)
        goto err_team_queue_override_init;

    team_adjust_ops(team);

    INIT_LIST_HEAD(&team->option_list);
    INIT_LIST_HEAD(&team->option_inst_list);
    err = team_options_register(team, team_options, ARRAY_SIZE(team_options));
    if (err)
        goto err_options_register;
    netif_carrier_off(dev);

    team_set_lockdep_class(dev);

    return 0;

err_options_register:
    team_queue_override_fini(team);
err_team_queue_override_init:
    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));
    team_queue_override_fini(team);
    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;
    unsigned int len = skb->len;

    tx_success = team_queue_override_transmit(team, skb);
    if (!tx_success)
        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 u16 team_select_queue(struct net_device *dev, struct sk_buff *skb)
{
    /*
     * This helper function exists to help dev_pick_tx get the correct
     * destination queue.  Using a helper function skips a call to
     * skb_tx_hash and will put the skbs in the queue we expect on their
     * way down to the team driver.
     */
    u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;

    /*
     * Save the original txq to restore before passing to the driver
     */
    qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;

    if (unlikely(txq >= dev->real_num_tx_queues)) {
        do {
            txq -= dev->real_num_tx_queues;
        } while (txq >= dev->real_num_tx_queues);
    }
    return txq;
}

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 sockaddr *addr = p;
    struct team *team = netdev_priv(dev);
    struct team_port *port;

    if (dev->type == ARPHRD_ETHER && !is_valid_ether_addr(addr->sa_data))
        return -EADDRNOTAVAIL;
    memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
    dev->addr_assign_type &= ~NET_ADDR_RANDOM;
    rcu_read_lock();
    list_for_each_entry_rcu(port, &team->port_list, list)
        if (team->ops.port_change_dev_addr)
            team->ops.port_change_dev_addr(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;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void team_poll_controller(struct net_device *dev)
{
}

static void __team_netpoll_cleanup(struct team *team)
{
    struct team_port *port;

    list_for_each_entry(port, &team->port_list, list)
        team_port_disable_netpoll(port);
}

static void team_netpoll_cleanup(struct net_device *dev)
{
    struct team *team = netdev_priv(dev);

    mutex_lock(&team->lock);
    __team_netpoll_cleanup(team);
    mutex_unlock(&team->lock);
}

static int team_netpoll_setup(struct net_device *dev,
                  struct netpoll_info *npifo, gfp_t gfp)
{
    struct team *team = netdev_priv(dev);
    struct team_port *port;
    int err = 0;

    mutex_lock(&team->lock);
    list_for_each_entry(port, &team->port_list, list) {
        err = team_port_enable_netpoll(team, port, gfp);
        if (err) {
            __team_netpoll_cleanup(team);
            break;
        }
    }
    mutex_unlock(&team->lock);
    return err;
}
#endif

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_select_queue   = team_select_queue,
    .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,
#ifdef CONFIG_NET_POLL_CONTROLLER
    .ndo_poll_controller    = team_poll_controller,
    .ndo_netpoll_setup  = team_netpoll_setup,
    .ndo_netpoll_cleanup    = team_netpoll_cleanup,
#endif
    .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_by_port(struct net_device *dev,
                   struct net_device *port_dev)
{
    dev->header_ops = port_dev->header_ops;
    dev->type = port_dev->type;
    dev->hard_header_len = port_dev->hard_header_len;
    dev->addr_len = port_dev->addr_len;
    dev->mtu = port_dev->mtu;
    memcpy(dev->broadcast, port_dev->broadcast, port_dev->addr_len);
    memcpy(dev->dev_addr, port_dev->dev_addr, port_dev->addr_len);
    dev->addr_assign_type &= ~NET_ADDR_RANDOM;
}

static int team_dev_type_check_change(struct net_device *dev,
                      struct net_device *port_dev)
{
    struct team *team = netdev_priv(dev);
    char *portname = port_dev->name;
    int err;

    if (dev->type == port_dev->type)
        return 0;
    if (!list_empty(&team->port_list)) {
        netdev_err(dev, "Device %s is of different type\n", portname);
        return -EBUSY;
    }
    err = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, dev);
    err = notifier_to_errno(err);
    if (err) {
        netdev_err(dev, "Refused to change device type\n");
        return err;
    }
    dev_uc_flush(dev);
    dev_mc_flush(dev);
    team_setup_by_port(dev, port_dev);
    call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
    return 0;
}

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 | IFF_LIVE_ADDR_CHANGE;

    dev->features |= NETIF_F_LLTX;
    dev->features |= NETIF_F_GRO;
    dev->hw_features = TEAM_VLAN_FEATURES |
               NETIF_F_HW_VLAN_TX |
               NETIF_F_HW_VLAN_RX |
               NETIF_F_HW_VLAN_FILTER;

    dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
    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)
        eth_hw_addr_random(dev);

    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 unsigned int team_get_num_tx_queues(void)
{
    return TEAM_DEFAULT_NUM_TX_QUEUES;
}

static unsigned int team_get_num_rx_queues(void)
{
    return TEAM_DEFAULT_NUM_RX_QUEUES;
}

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,
    .get_num_tx_queues  = team_get_num_tx_queues,
    .get_num_rx_queues  = team_get_num_rx_queues,
};


/***********************************
 * 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 },
};

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_DEFAULT_SIZE, GFP_KERNEL);
    if (!msg)
        return -ENOMEM;

    hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
              &team_nl_family, 0, TEAM_CMD_NOOP);
    if (!hdr) {
        err = -EMSGSIZE;
        goto err_msg_put;
    }

    genlmsg_end(msg, hdr);

    return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);

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_DEFAULT_SIZE, 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_portid);
    return err;

err_fill:
    nlmsg_free(skb);
    return err;
}

typedef int team_nl_send_func_t(struct sk_buff *skb,
                struct team *team, u32 portid);

static int team_nl_send_unicast(struct sk_buff *skb, struct team *team, u32 portid)
{
    return genlmsg_unicast(dev_net(team->dev), skb, portid);
}

static int team_nl_fill_one_option_get(struct sk_buff *skb, struct team *team,
                       struct team_option_inst *opt_inst)
{
    struct nlattr *option_item;
    struct team_option *option = opt_inst->option;
    struct team_option_inst_info *opt_inst_info = &opt_inst->info;
    struct team_gsetter_ctx ctx;
    int err;

    ctx.info = opt_inst_info;
    err = team_option_get(team, opt_inst, &ctx);
    if (err)
        return err;

    option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
    if (!option_item)
        return -EMSGSIZE;

    if (nla_put_string(skb, TEAM_ATTR_OPTION_NAME, option->name))
        goto nest_cancel;
    if (opt_inst_info->port &&
        nla_put_u32(skb, TEAM_ATTR_OPTION_PORT_IFINDEX,
            opt_inst_info->port->dev->ifindex))
        goto nest_cancel;
    if (opt_inst->option->array_size &&
        nla_put_u32(skb, TEAM_ATTR_OPTION_ARRAY_INDEX,
            opt_inst_info->array_index))
        goto nest_cancel;

    switch (option->type) {
    case TEAM_OPTION_TYPE_U32:
        if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32))
            goto nest_cancel;
        if (nla_put_u32(skb, TEAM_ATTR_OPTION_DATA, ctx.data.u32_val))
            goto nest_cancel;
        break;
    case TEAM_OPTION_TYPE_STRING:
        if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING))
            goto nest_cancel;
        if (nla_put_string(skb, TEAM_ATTR_OPTION_DATA,
                   ctx.data.str_val))
            goto nest_cancel;
        break;
    case TEAM_OPTION_TYPE_BINARY:
        if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_BINARY))
            goto nest_cancel;
        if (nla_put(skb, TEAM_ATTR_OPTION_DATA, ctx.data.bin_val.len,
                ctx.data.bin_val.ptr))
            goto nest_cancel;
        break;
    case TEAM_OPTION_TYPE_BOOL:
        if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_FLAG))
            goto nest_cancel;
        if (ctx.data.bool_val &&
            nla_put_flag(skb, TEAM_ATTR_OPTION_DATA))
            goto nest_cancel;
        break;
    case TEAM_OPTION_TYPE_S32:
        if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_S32))
            goto nest_cancel;
        if (nla_put_s32(skb, TEAM_ATTR_OPTION_DATA, ctx.data.s32_val))
            goto nest_cancel;
        break;
    default:
        BUG();
    }
    if (opt_inst->removed && nla_put_flag(skb, TEAM_ATTR_OPTION_REMOVED))
        goto nest_cancel;
    if (opt_inst->changed) {
        if (nla_put_flag(skb, TEAM_ATTR_OPTION_CHANGED))
            goto nest_cancel;
        opt_inst->changed = false;
    }
    nla_nest_end(skb, option_item);
    return 0;

nest_cancel:
    nla_nest_cancel(skb, option_item);
    return -EMSGSIZE;
}

static int __send_and_alloc_skb(struct sk_buff **pskb,
                struct team *team, u32 portid,
                team_nl_send_func_t *send_func)
{
    int err;

    if (*pskb) {
        err = send_func(*pskb, team, portid);
        if (err)
            return err;
    }
    *pskb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
    if (!*pskb)
        return -ENOMEM;
    return 0;
}

static int team_nl_send_options_get(struct team *team, u32 portid, u32 seq,
                    int flags, team_nl_send_func_t *send_func,
                    struct list_head *sel_opt_inst_list)
{
    struct nlattr *option_list;
    struct nlmsghdr *nlh;
    void *hdr;
    struct team_option_inst *opt_inst;
    int err;
    struct sk_buff *skb = NULL;
    bool incomplete;
    int i;

    opt_inst = list_first_entry(sel_opt_inst_list,
                    struct team_option_inst, tmp_list);

start_again:
    err = __send_and_alloc_skb(&skb, team, portid, send_func);
    if (err)
        return err;

    hdr = genlmsg_put(skb, portid, seq, &team_nl_family, flags | NLM_F_MULTI,
              TEAM_CMD_OPTIONS_GET);
    if (!hdr)
        return -EMSGSIZE;

    if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
        goto nla_put_failure;
    option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
    if (!option_list)
        goto nla_put_failure;

    i = 0;
    incomplete = false;
    list_for_each_entry_from(opt_inst, sel_opt_inst_list, tmp_list) {
        err = team_nl_fill_one_option_get(skb, team, opt_inst);
        if (err) {
            if (err == -EMSGSIZE) {
                if (!i)
                    goto errout;
                incomplete = true;
                break;
            }
            goto errout;
        }
        i++;
    }

    nla_nest_end(skb, option_list);
    genlmsg_end(skb, hdr);
    if (incomplete)
        goto start_again;

send_done:
    nlh = nlmsg_put(skb, portid, seq, NLMSG_DONE, 0, flags | NLM_F_MULTI);
    if (!nlh) {
        err = __send_and_alloc_skb(&skb, team, portid, send_func);
        if (err)
            goto errout;
        goto send_done;
    }

    return send_func(skb, team, portid);

nla_put_failure:
    err = -EMSGSIZE;
errout:
    genlmsg_cancel(skb, hdr);
    nlmsg_free(skb);
    return err;
}

static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info)
{
    struct team *team;
    struct team_option_inst *opt_inst;
    int err;
    LIST_HEAD(sel_opt_inst_list);

    team = team_nl_team_get(info);
    if (!team)
        return -EINVAL;

    list_for_each_entry(opt_inst, &team->option_inst_list, list)
        list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list);
    err = team_nl_send_options_get(team, info->snd_portid, info->snd_seq,
                       NLM_F_ACK, team_nl_send_unicast,
                       &sel_opt_inst_list);

    team_nl_team_put(team);

    return err;
}

static int team_nl_send_event_options_get(struct team *team,
                      struct list_head *sel_opt_inst_list);

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;
    LIST_HEAD(opt_inst_list);

    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 *opt_attrs[TEAM_ATTR_OPTION_MAX + 1];
        struct nlattr *attr;
        struct nlattr *attr_data;
        enum team_option_type opt_type;
        int opt_port_ifindex = 0; /* != 0 for per-port options */
        u32 opt_array_index = 0;
        bool opt_is_array = false;
        struct team_option_inst *opt_inst;
        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(opt_attrs, TEAM_ATTR_OPTION_MAX,
                       nl_option, team_nl_option_policy);
        if (err)
            goto team_put;
        if (!opt_attrs[TEAM_ATTR_OPTION_NAME] ||
            !opt_attrs[TEAM_ATTR_OPTION_TYPE]) {
            err = -EINVAL;
            goto team_put;
        }
        switch (nla_get_u8(opt_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;
        case NLA_BINARY:
            opt_type = TEAM_OPTION_TYPE_BINARY;
            break;
        case NLA_FLAG:
            opt_type = TEAM_OPTION_TYPE_BOOL;
            break;
        case NLA_S32:
            opt_type = TEAM_OPTION_TYPE_S32;
            break;
        default:
            goto team_put;
        }

        attr_data = opt_attrs[TEAM_ATTR_OPTION_DATA];
        if (opt_type != TEAM_OPTION_TYPE_BOOL && !attr_data) {
            err = -EINVAL;
            goto team_put;
        }

        opt_name = nla_data(opt_attrs[TEAM_ATTR_OPTION_NAME]);
        attr = opt_attrs[TEAM_ATTR_OPTION_PORT_IFINDEX];
        if (attr)
            opt_port_ifindex = nla_get_u32(attr);

        attr = opt_attrs[TEAM_ATTR_OPTION_ARRAY_INDEX];
        if (attr) {
            opt_is_array = true;
            opt_array_index = nla_get_u32(attr);
        }

        list_for_each_entry(opt_inst, &team->option_inst_list, list) {
            struct team_option *option = opt_inst->option;
            struct team_gsetter_ctx ctx;
            struct team_option_inst_info *opt_inst_info;
            int tmp_ifindex;

            opt_inst_info = &opt_inst->info;
            tmp_ifindex = opt_inst_info->port ?
                      opt_inst_info->port->dev->ifindex : 0;
            if (option->type != opt_type ||
                strcmp(option->name, opt_name) ||
                tmp_ifindex != opt_port_ifindex ||
                (option->array_size && !opt_is_array) ||
                opt_inst_info->array_index != opt_array_index)
                continue;
            opt_found = true;
            ctx.info = opt_inst_info;
            switch (opt_type) {
            case TEAM_OPTION_TYPE_U32:
                ctx.data.u32_val = nla_get_u32(attr_data);
                break;
            case TEAM_OPTION_TYPE_STRING:
                if (nla_len(attr_data) > TEAM_STRING_MAX_LEN) {
                    err = -EINVAL;
                    goto team_put;
                }
                ctx.data.str_val = nla_data(attr_data);
                break;
            case TEAM_OPTION_TYPE_BINARY:
                ctx.data.bin_val.len = nla_len(attr_data);
                ctx.data.bin_val.ptr = nla_data(attr_data);
                break;
            case TEAM_OPTION_TYPE_BOOL:
                ctx.data.bool_val = attr_data ? true : false;
                break;
            case TEAM_OPTION_TYPE_S32:
                ctx.data.s32_val = nla_get_s32(attr_data);
                break;
            default:
                BUG();
            }
            err = team_option_set(team, opt_inst, &ctx);
            if (err)
                goto team_put;
            opt_inst->changed = true;
            list_add(&opt_inst->tmp_list, &opt_inst_list);
        }
        if (!opt_found) {
            err = -ENOENT;
            goto team_put;
        }
    }

    err = team_nl_send_event_options_get(team, &opt_inst_list);

team_put:
    team_nl_team_put(team);

    return err;
}

static int team_nl_fill_port_list_get(struct sk_buff *skb,
                      u32 portid, u32 seq, int flags,
                      struct team *team,
                      bool fillall)
{
    struct nlattr *port_list;
    void *hdr;
    struct team_port *port;

    hdr = genlmsg_put(skb, portid, seq, &team_nl_family, flags,
              TEAM_CMD_PORT_LIST_GET);
    if (!hdr)
        return -EMSGSIZE;

    if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
        goto nla_put_failure;
    port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
    if (!port_list)
        goto nla_put_failure;

    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;
        if (nla_put_u32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex))
            goto nla_put_failure;
        if (port->changed) {
            if (nla_put_flag(skb, TEAM_ATTR_PORT_CHANGED))
                goto nla_put_failure;
            port->changed = false;
        }
        if ((port->removed &&
             nla_put_flag(skb, TEAM_ATTR_PORT_REMOVED)) ||
            (port->state.linkup &&
             nla_put_flag(skb, TEAM_ATTR_PORT_LINKUP)) ||
            nla_put_u32(skb, TEAM_ATTR_PORT_SPEED, port->state.speed) ||
            nla_put_u8(skb, TEAM_ATTR_PORT_DUPLEX, port->state.duplex))
            goto nla_put_failure;
        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_portid,
                      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_multicast(struct sk_buff *skb,
                  struct team *team, u32 portid)
{
    return genlmsg_multicast_netns(dev_net(team->dev), skb, 0,
                       team_change_event_mcgrp.id, GFP_KERNEL);
}

static int team_nl_send_event_options_get(struct team *team,
                      struct list_head *sel_opt_inst_list)
{
    return team_nl_send_options_get(team, 0, 0, 0, team_nl_send_multicast,
                    sel_opt_inst_list);
}

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_DEFAULT_SIZE, 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;
    struct team_option_inst *opt_inst;
    LIST_HEAD(sel_opt_inst_list);

    list_for_each_entry(opt_inst, &team->option_inst_list, list) {
        if (opt_inst->changed)
            list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list);
    }
    err = team_nl_send_event_options_get(team, &sel_opt_inst_list);
    if (err && err != -ESRCH)
        netdev_warn(team->dev, "Failed to send options change via netlink (err %d)\n",
                err);
}

/* rtnl lock is held */

static void __team_port_change_send(struct team_port *port, bool linkup)
{
    int err;

    port->changed = true;
    port->state.linkup = linkup;
    team_refresh_port_linkup(port);
    if (linkup) {
        struct ethtool_cmd ecmd;

        err = __ethtool_get_settings(port->dev, &ecmd);
        if (!err) {
            port->state.speed = ethtool_cmd_speed(&ecmd);
            port->state.duplex = ecmd.duplex;
            goto send_event;
        }
    }
    port->state.speed = 0;
    port->state.duplex = 0;

send_event:
    err = team_nl_send_event_port_list_get(port->team);
    if (err && err != -ESRCH)
        netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink (err %d)\n",
                port->dev->name, err);

}

static void __team_port_change_check(struct team_port *port, bool linkup)
{
    if (port->state.linkup != linkup)
        __team_port_change_send(port, linkup);
}

static void __team_port_change_port_added(struct team_port *port, bool linkup)
{
    __team_port_change_send(port, linkup);
}

static void __team_port_change_port_removed(struct team_port *port)
{
    port->removed = true;
    __team_port_change_send(port, false);
}

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 <[email protected]>");
MODULE_DESCRIPTION("Ethernet team device driver");
MODULE_ALIAS_RTNL_LINK(DRV_NAME);