diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h index 19d499dcab76..0c0bea091de8 100644 --- a/drivers/infiniband/core/core_priv.h +++ b/drivers/infiniband/core/core_priv.h @@ -127,14 +127,7 @@ void ib_cache_release_one(struct ib_device *device); static inline bool rdma_is_upper_dev_rcu(struct net_device *dev, struct net_device *upper) { - struct net_device *_upper = NULL; - struct list_head *iter; - - netdev_for_each_all_upper_dev_rcu(dev, _upper, iter) - if (_upper == upper) - break; - - return _upper == upper; + return netdev_has_upper_dev_all_rcu(dev, upper); } int addr_init(void); diff --git a/drivers/infiniband/core/roce_gid_mgmt.c b/drivers/infiniband/core/roce_gid_mgmt.c index 06556c34606d..3a64a0881882 100644 --- a/drivers/infiniband/core/roce_gid_mgmt.c +++ b/drivers/infiniband/core/roce_gid_mgmt.c @@ -437,6 +437,28 @@ static void callback_for_addr_gid_device_scan(struct ib_device *device, &parsed->gid_attr); } +struct upper_list { + struct list_head list; + struct net_device *upper; +}; + +static int netdev_upper_walk(struct net_device *upper, void *data) +{ + struct upper_list *entry = kmalloc(sizeof(*entry), GFP_ATOMIC); + struct list_head *upper_list = data; + + if (!entry) { + pr_info("roce_gid_mgmt: couldn't allocate entry to delete ndev\n"); + return 0; + } + + list_add_tail(&entry->list, upper_list); + dev_hold(upper); + entry->upper = upper; + + return 0; +} + static void handle_netdev_upper(struct ib_device *ib_dev, u8 port, void *cookie, void (*handle_netdev)(struct ib_device *ib_dev, @@ -444,30 +466,12 @@ static void handle_netdev_upper(struct ib_device *ib_dev, u8 port, struct net_device *ndev)) { struct net_device *ndev = (struct net_device *)cookie; - struct upper_list { - struct list_head list; - struct net_device *upper; - }; - struct net_device *upper; - struct list_head *iter; struct upper_list *upper_iter; struct upper_list *upper_temp; LIST_HEAD(upper_list); rcu_read_lock(); - netdev_for_each_all_upper_dev_rcu(ndev, upper, iter) { - struct upper_list *entry = kmalloc(sizeof(*entry), - GFP_ATOMIC); - - if (!entry) { - pr_info("roce_gid_mgmt: couldn't allocate entry to delete ndev\n"); - continue; - } - - list_add_tail(&entry->list, &upper_list); - dev_hold(upper); - entry->upper = upper; - } + netdev_walk_all_upper_dev_rcu(ndev, netdev_upper_walk, &upper_list); rcu_read_unlock(); handle_netdev(ib_dev, port, ndev); diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index 5636fc3da6b8..cc059218c962 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -292,6 +292,25 @@ static struct net_device *ipoib_get_master_net_dev(struct net_device *dev) return dev; } +struct ipoib_walk_data { + const struct sockaddr *addr; + struct net_device *result; +}; + +static int ipoib_upper_walk(struct net_device *upper, void *_data) +{ + struct ipoib_walk_data *data = _data; + int ret = 0; + + if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) { + dev_hold(upper); + data->result = upper; + ret = 1; + } + + return ret; +} + /** * Find a net_device matching the given address, which is an upper device of * the given net_device. @@ -304,27 +323,21 @@ static struct net_device *ipoib_get_master_net_dev(struct net_device *dev) static struct net_device *ipoib_get_net_dev_match_addr( const struct sockaddr *addr, struct net_device *dev) { - struct net_device *upper, - *result = NULL; - struct list_head *iter; + struct ipoib_walk_data data = { + .addr = addr, + }; rcu_read_lock(); if (ipoib_is_dev_match_addr_rcu(addr, dev)) { dev_hold(dev); - result = dev; + data.result = dev; goto out; } - netdev_for_each_all_upper_dev_rcu(dev, upper, iter) { - if (ipoib_is_dev_match_addr_rcu(addr, upper)) { - dev_hold(upper); - result = upper; - break; - } - } + netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data); out: rcu_read_unlock(); - return result; + return data.result; } /* returns the number of IPoIB netdevs on top a given ipoib device matching a diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index 551f0f8dead3..c80b023092dd 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -950,13 +950,61 @@ static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], dev_queue_xmit(skb); } +struct alb_walk_data { + struct bonding *bond; + struct slave *slave; + u8 *mac_addr; + bool strict_match; +}; + +static int alb_upper_dev_walk(struct net_device *upper, void *_data) +{ + struct alb_walk_data *data = _data; + bool strict_match = data->strict_match; + struct bonding *bond = data->bond; + struct slave *slave = data->slave; + u8 *mac_addr = data->mac_addr; + struct bond_vlan_tag *tags; + + if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) { + if (strict_match && + ether_addr_equal_64bits(mac_addr, + upper->dev_addr)) { + alb_send_lp_vid(slave, mac_addr, + vlan_dev_vlan_proto(upper), + vlan_dev_vlan_id(upper)); + } else if (!strict_match) { + alb_send_lp_vid(slave, upper->dev_addr, + vlan_dev_vlan_proto(upper), + vlan_dev_vlan_id(upper)); + } + } + + /* If this is a macvlan device, then only send updates + * when strict_match is turned off. + */ + if (netif_is_macvlan(upper) && !strict_match) { + tags = bond_verify_device_path(bond->dev, upper, 0); + if (IS_ERR_OR_NULL(tags)) + BUG(); + alb_send_lp_vid(slave, upper->dev_addr, + tags[0].vlan_proto, tags[0].vlan_id); + kfree(tags); + } + + return 0; +} + static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], bool strict_match) { struct bonding *bond = bond_get_bond_by_slave(slave); - struct net_device *upper; - struct list_head *iter; - struct bond_vlan_tag *tags; + struct alb_walk_data data = { + .strict_match = strict_match, + .mac_addr = mac_addr, + .slave = slave, + .bond = bond, + }; /* send untagged */ alb_send_lp_vid(slave, mac_addr, 0, 0); @@ -965,33 +1013,7 @@ static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], * for that device. */ rcu_read_lock(); - netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { - if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) { - if (strict_match && - ether_addr_equal_64bits(mac_addr, - upper->dev_addr)) { - alb_send_lp_vid(slave, mac_addr, - vlan_dev_vlan_proto(upper), - vlan_dev_vlan_id(upper)); - } else if (!strict_match) { - alb_send_lp_vid(slave, upper->dev_addr, - vlan_dev_vlan_proto(upper), - vlan_dev_vlan_id(upper)); - } - } - - /* If this is a macvlan device, then only send updates - * when strict_match is turned off. - */ - if (netif_is_macvlan(upper) && !strict_match) { - tags = bond_verify_device_path(bond->dev, upper, 0); - if (IS_ERR_OR_NULL(tags)) - BUG(); - alb_send_lp_vid(slave, upper->dev_addr, - tags[0].vlan_proto, tags[0].vlan_id); - kfree(tags); - } - } + netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &data); rcu_read_unlock(); } diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 5fa36ebc0640..c9944d86d045 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2270,22 +2270,23 @@ re_arm: } } +static int bond_upper_dev_walk(struct net_device *upper, void *data) +{ + __be32 ip = *((__be32 *)data); + + return ip == bond_confirm_addr(upper, 0, ip); +} + static bool bond_has_this_ip(struct bonding *bond, __be32 ip) { - struct net_device *upper; - struct list_head *iter; bool ret = false; if (ip == bond_confirm_addr(bond->dev, 0, ip)) return true; rcu_read_lock(); - netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { - if (ip == bond_confirm_addr(upper, 0, ip)) { - ret = true; - break; - } - } + if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip)) + ret = true; rcu_read_unlock(); return ret; diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index 7dfde209b0e0..cbd2cfa1b154 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -5012,24 +5012,23 @@ fwd_queue_err: return err; } +static int ixgbe_upper_dev_walk(struct net_device *upper, void *data) +{ + if (netif_is_macvlan(upper)) { + struct macvlan_dev *dfwd = netdev_priv(upper); + struct ixgbe_fwd_adapter *vadapter = dfwd->fwd_priv; + + if (dfwd->fwd_priv) + ixgbe_fwd_ring_up(upper, vadapter); + } + + return 0; +} + static void ixgbe_configure_dfwd(struct ixgbe_adapter *adapter) { - struct net_device *upper; - struct list_head *iter; - int err; - - netdev_for_each_all_upper_dev_rcu(adapter->netdev, upper, iter) { - if (netif_is_macvlan(upper)) { - struct macvlan_dev *dfwd = netdev_priv(upper); - struct ixgbe_fwd_adapter *vadapter = dfwd->fwd_priv; - - if (dfwd->fwd_priv) { - err = ixgbe_fwd_ring_up(upper, vadapter); - if (err) - continue; - } - } - } + netdev_walk_all_upper_dev_rcu(adapter->netdev, + ixgbe_upper_dev_walk, NULL); } static void ixgbe_configure(struct ixgbe_adapter *adapter) @@ -5448,12 +5447,25 @@ static void ixgbe_fdir_filter_exit(struct ixgbe_adapter *adapter) spin_unlock(&adapter->fdir_perfect_lock); } +static int ixgbe_disable_macvlan(struct net_device *upper, void *data) +{ + if (netif_is_macvlan(upper)) { + struct macvlan_dev *vlan = netdev_priv(upper); + + if (vlan->fwd_priv) { + netif_tx_stop_all_queues(upper); + netif_carrier_off(upper); + netif_tx_disable(upper); + } + } + + return 0; +} + void ixgbe_down(struct ixgbe_adapter *adapter) { struct net_device *netdev = adapter->netdev; struct ixgbe_hw *hw = &adapter->hw; - struct net_device *upper; - struct list_head *iter; int i; /* signal that we are down to the interrupt handler */ @@ -5477,17 +5489,8 @@ void ixgbe_down(struct ixgbe_adapter *adapter) netif_tx_disable(netdev); /* disable any upper devices */ - netdev_for_each_all_upper_dev_rcu(adapter->netdev, upper, iter) { - if (netif_is_macvlan(upper)) { - struct macvlan_dev *vlan = netdev_priv(upper); - - if (vlan->fwd_priv) { - netif_tx_stop_all_queues(upper); - netif_carrier_off(upper); - netif_tx_disable(upper); - } - } - } + netdev_walk_all_upper_dev_rcu(adapter->netdev, + ixgbe_disable_macvlan, NULL); ixgbe_irq_disable(adapter); @@ -6723,6 +6726,18 @@ static void ixgbe_update_default_up(struct ixgbe_adapter *adapter) #endif } +static int ixgbe_enable_macvlan(struct net_device *upper, void *data) +{ + if (netif_is_macvlan(upper)) { + struct macvlan_dev *vlan = netdev_priv(upper); + + if (vlan->fwd_priv) + netif_tx_wake_all_queues(upper); + } + + return 0; +} + /** * ixgbe_watchdog_link_is_up - update netif_carrier status and * print link up message @@ -6732,8 +6747,6 @@ static void ixgbe_watchdog_link_is_up(struct ixgbe_adapter *adapter) { struct net_device *netdev = adapter->netdev; struct ixgbe_hw *hw = &adapter->hw; - struct net_device *upper; - struct list_head *iter; u32 link_speed = adapter->link_speed; const char *speed_str; bool flow_rx, flow_tx; @@ -6804,14 +6817,8 @@ static void ixgbe_watchdog_link_is_up(struct ixgbe_adapter *adapter) /* enable any upper devices */ rtnl_lock(); - netdev_for_each_all_upper_dev_rcu(adapter->netdev, upper, iter) { - if (netif_is_macvlan(upper)) { - struct macvlan_dev *vlan = netdev_priv(upper); - - if (vlan->fwd_priv) - netif_tx_wake_all_queues(upper); - } - } + netdev_walk_all_upper_dev_rcu(adapter->netdev, + ixgbe_enable_macvlan, NULL); rtnl_unlock(); /* update the default user priority for VFs */ @@ -8345,12 +8352,38 @@ static int ixgbe_configure_clsu32_del_hnode(struct ixgbe_adapter *adapter, } #ifdef CONFIG_NET_CLS_ACT +struct upper_walk_data { + struct ixgbe_adapter *adapter; + u64 action; + int ifindex; + u8 queue; +}; + +static int get_macvlan_queue(struct net_device *upper, void *_data) +{ + if (netif_is_macvlan(upper)) { + struct macvlan_dev *dfwd = netdev_priv(upper); + struct ixgbe_fwd_adapter *vadapter = dfwd->fwd_priv; + struct upper_walk_data *data = _data; + struct ixgbe_adapter *adapter = data->adapter; + int ifindex = data->ifindex; + + if (vadapter && vadapter->netdev->ifindex == ifindex) { + data->queue = adapter->rx_ring[vadapter->rx_base_queue]->reg_idx; + data->action = data->queue; + return 1; + } + } + + return 0; +} + static int handle_redirect_action(struct ixgbe_adapter *adapter, int ifindex, u8 *queue, u64 *action) { unsigned int num_vfs = adapter->num_vfs, vf; + struct upper_walk_data data; struct net_device *upper; - struct list_head *iter; /* redirect to a SRIOV VF */ for (vf = 0; vf < num_vfs; ++vf) { @@ -8368,17 +8401,16 @@ static int handle_redirect_action(struct ixgbe_adapter *adapter, int ifindex, } /* redirect to a offloaded macvlan netdev */ - netdev_for_each_all_upper_dev_rcu(adapter->netdev, upper, iter) { - if (netif_is_macvlan(upper)) { - struct macvlan_dev *dfwd = netdev_priv(upper); - struct ixgbe_fwd_adapter *vadapter = dfwd->fwd_priv; + data.adapter = adapter; + data.ifindex = ifindex; + data.action = 0; + data.queue = 0; + if (netdev_walk_all_upper_dev_rcu(adapter->netdev, + get_macvlan_queue, &data)) { + *action = data.action; + *queue = data.queue; - if (vadapter && vadapter->netdev->ifindex == ifindex) { - *queue = adapter->rx_ring[vadapter->rx_base_queue]->reg_idx; - *action = *queue; - return 0; - } - } + return 0; } return -EINVAL; diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c index 43a5eddc2c11..99805fd3d110 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c @@ -3092,19 +3092,30 @@ static bool mlxsw_sp_port_dev_check(const struct net_device *dev) return dev->netdev_ops == &mlxsw_sp_port_netdev_ops; } +static int mlxsw_lower_dev_walk(struct net_device *lower_dev, void *data) +{ + struct mlxsw_sp_port **port = data; + int ret = 0; + + if (mlxsw_sp_port_dev_check(lower_dev)) { + *port = netdev_priv(lower_dev); + ret = 1; + } + + return ret; +} + static struct mlxsw_sp_port *mlxsw_sp_port_dev_lower_find(struct net_device *dev) { - struct net_device *lower_dev; - struct list_head *iter; + struct mlxsw_sp_port *port; if (mlxsw_sp_port_dev_check(dev)) return netdev_priv(dev); - netdev_for_each_all_lower_dev(dev, lower_dev, iter) { - if (mlxsw_sp_port_dev_check(lower_dev)) - return netdev_priv(lower_dev); - } - return NULL; + port = NULL; + netdev_walk_all_lower_dev(dev, mlxsw_lower_dev_walk, &port); + + return port; } static struct mlxsw_sp *mlxsw_sp_lower_get(struct net_device *dev) @@ -3117,17 +3128,15 @@ static struct mlxsw_sp *mlxsw_sp_lower_get(struct net_device *dev) static struct mlxsw_sp_port *mlxsw_sp_port_dev_lower_find_rcu(struct net_device *dev) { - struct net_device *lower_dev; - struct list_head *iter; + struct mlxsw_sp_port *port; if (mlxsw_sp_port_dev_check(dev)) return netdev_priv(dev); - netdev_for_each_all_lower_dev_rcu(dev, lower_dev, iter) { - if (mlxsw_sp_port_dev_check(lower_dev)) - return netdev_priv(lower_dev); - } - return NULL; + port = NULL; + netdev_walk_all_lower_dev_rcu(dev, mlxsw_lower_dev_walk, &port); + + return port; } struct mlxsw_sp_port *mlxsw_sp_port_lower_dev_hold(struct net_device *dev) diff --git a/drivers/net/ethernet/rocker/rocker_main.c b/drivers/net/ethernet/rocker/rocker_main.c index 9b64f369076d..2e81b702a927 100644 --- a/drivers/net/ethernet/rocker/rocker_main.c +++ b/drivers/net/ethernet/rocker/rocker_main.c @@ -2839,20 +2839,37 @@ static bool rocker_port_dev_check_under(const struct net_device *dev, return true; } +struct rocker_walk_data { + struct rocker *rocker; + struct rocker_port *port; +}; + +static int rocker_lower_dev_walk(struct net_device *lower_dev, void *_data) +{ + struct rocker_walk_data *data = _data; + int ret = 0; + + if (rocker_port_dev_check_under(lower_dev, data->rocker)) { + data->port = netdev_priv(lower_dev); + ret = 1; + } + + return ret; +} + struct rocker_port *rocker_port_dev_lower_find(struct net_device *dev, struct rocker *rocker) { - struct net_device *lower_dev; - struct list_head *iter; + struct rocker_walk_data data; if (rocker_port_dev_check_under(dev, rocker)) return netdev_priv(dev); - netdev_for_each_all_lower_dev(dev, lower_dev, iter) { - if (rocker_port_dev_check_under(lower_dev, rocker)) - return netdev_priv(lower_dev); - } - return NULL; + data.rocker = rocker; + data.port = NULL; + netdev_walk_all_lower_dev(dev, rocker_lower_dev_walk, &data); + + return data.port; } static int rocker_netdevice_event(struct notifier_block *unused, diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index bf341b65ca5e..458c87631e7f 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1456,7 +1456,6 @@ enum netdev_priv_flags { * @ptype_specific: Device-specific, protocol-specific packet handlers * * @adj_list: Directly linked devices, like slaves for bonding - * @all_adj_list: All linked devices, *including* neighbours * @features: Currently active device features * @hw_features: User-changeable features * @@ -1675,11 +1674,6 @@ struct net_device { struct list_head lower; } adj_list; - struct { - struct list_head upper; - struct list_head lower; - } all_adj_list; - netdev_features_t features; netdev_features_t hw_features; netdev_features_t wanted_features; @@ -3771,12 +3765,13 @@ struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, updev; \ updev = netdev_upper_get_next_dev_rcu(dev, &(iter))) -/* iterate through upper list, must be called under RCU read lock */ -#define netdev_for_each_all_upper_dev_rcu(dev, updev, iter) \ - for (iter = &(dev)->all_adj_list.upper, \ - updev = netdev_all_upper_get_next_dev_rcu(dev, &(iter)); \ - updev; \ - updev = netdev_all_upper_get_next_dev_rcu(dev, &(iter))) +int netdev_walk_all_upper_dev_rcu(struct net_device *dev, + int (*fn)(struct net_device *upper_dev, + void *data), + void *data); + +bool netdev_has_upper_dev_all_rcu(struct net_device *dev, + struct net_device *upper_dev); void *netdev_lower_get_next_private(struct net_device *dev, struct list_head **iter); @@ -3809,17 +3804,14 @@ struct net_device *netdev_all_lower_get_next(struct net_device *dev, struct net_device *netdev_all_lower_get_next_rcu(struct net_device *dev, struct list_head **iter); -#define netdev_for_each_all_lower_dev(dev, ldev, iter) \ - for (iter = (dev)->all_adj_list.lower.next, \ - ldev = netdev_all_lower_get_next(dev, &(iter)); \ - ldev; \ - ldev = netdev_all_lower_get_next(dev, &(iter))) - -#define netdev_for_each_all_lower_dev_rcu(dev, ldev, iter) \ - for (iter = (dev)->all_adj_list.lower.next, \ - ldev = netdev_all_lower_get_next_rcu(dev, &(iter)); \ - ldev; \ - ldev = netdev_all_lower_get_next_rcu(dev, &(iter))) +int netdev_walk_all_lower_dev(struct net_device *dev, + int (*fn)(struct net_device *lower_dev, + void *data), + void *data); +int netdev_walk_all_lower_dev_rcu(struct net_device *dev, + int (*fn)(struct net_device *lower_dev, + void *data), + void *data); void *netdev_adjacent_get_private(struct list_head *adj_list); void *netdev_lower_get_first_private_rcu(struct net_device *dev); diff --git a/net/core/dev.c b/net/core/dev.c index 352e98129601..f55fb4536016 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -5137,6 +5137,13 @@ static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev, return NULL; } +static int __netdev_has_upper_dev(struct net_device *upper_dev, void *data) +{ + struct net_device *dev = data; + + return upper_dev == dev; +} + /** * netdev_has_upper_dev - Check if device is linked to an upper device * @dev: device @@ -5151,10 +5158,29 @@ bool netdev_has_upper_dev(struct net_device *dev, { ASSERT_RTNL(); - return __netdev_find_adj(upper_dev, &dev->all_adj_list.upper); + return netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev, + upper_dev); } EXPORT_SYMBOL(netdev_has_upper_dev); +/** + * netdev_has_upper_dev_all - Check if device is linked to an upper device + * @dev: device + * @upper_dev: upper device to check + * + * Find out if a device is linked to specified upper device and return true + * in case it is. Note that this checks the entire upper device chain. + * The caller must hold rcu lock. + */ + +bool netdev_has_upper_dev_all_rcu(struct net_device *dev, + struct net_device *upper_dev) +{ + return !!netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev, + upper_dev); +} +EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu); + /** * netdev_has_any_upper_dev - Check if device is linked to some device * @dev: device @@ -5166,7 +5192,7 @@ static bool netdev_has_any_upper_dev(struct net_device *dev) { ASSERT_RTNL(); - return !list_empty(&dev->all_adj_list.upper); + return !list_empty(&dev->adj_list.upper); } /** @@ -5193,6 +5219,20 @@ struct net_device *netdev_master_upper_dev_get(struct net_device *dev) } EXPORT_SYMBOL(netdev_master_upper_dev_get); +/** + * netdev_has_any_lower_dev - Check if device is linked to some device + * @dev: device + * + * Find out if a device is linked to a lower device and return true in case + * it is. The caller must hold the RTNL lock. + */ +static bool netdev_has_any_lower_dev(struct net_device *dev) +{ + ASSERT_RTNL(); + + return !list_empty(&dev->adj_list.lower); +} + void *netdev_adjacent_get_private(struct list_head *adj_list) { struct netdev_adjacent *adj; @@ -5229,16 +5269,8 @@ struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, } EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); -/** - * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list - * @dev: device - * @iter: list_head ** of the current position - * - * Gets the next device from the dev's upper list, starting from iter - * position. The caller must hold RCU read lock. - */ -struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, - struct list_head **iter) +static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev, + struct list_head **iter) { struct netdev_adjacent *upper; @@ -5246,14 +5278,41 @@ struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); - if (&upper->list == &dev->all_adj_list.upper) + if (&upper->list == &dev->adj_list.upper) return NULL; *iter = &upper->list; return upper->dev; } -EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu); + +int netdev_walk_all_upper_dev_rcu(struct net_device *dev, + int (*fn)(struct net_device *dev, + void *data), + void *data) +{ + struct net_device *udev; + struct list_head *iter; + int ret; + + for (iter = &dev->adj_list.upper, + udev = netdev_next_upper_dev_rcu(dev, &iter); + udev; + udev = netdev_next_upper_dev_rcu(dev, &iter)) { + /* first is the upper device itself */ + ret = fn(udev, data); + if (ret) + return ret; + + /* then look at all of its upper devices */ + ret = netdev_walk_all_upper_dev_rcu(udev, fn, data); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu); /** * netdev_lower_get_next_private - Get the next ->private from the @@ -5336,51 +5395,90 @@ void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) } EXPORT_SYMBOL(netdev_lower_get_next); -/** - * netdev_all_lower_get_next - Get the next device from all lower neighbour list - * @dev: device - * @iter: list_head ** of the current position - * - * Gets the next netdev_adjacent from the dev's all lower neighbour - * list, starting from iter position. The caller must hold RTNL lock or - * its own locking that guarantees that the neighbour all lower - * list will remain unchanged. - */ -struct net_device *netdev_all_lower_get_next(struct net_device *dev, struct list_head **iter) +static struct net_device *netdev_next_lower_dev(struct net_device *dev, + struct list_head **iter) { struct netdev_adjacent *lower; lower = list_entry(*iter, struct netdev_adjacent, list); - if (&lower->list == &dev->all_adj_list.lower) + if (&lower->list == &dev->adj_list.lower) return NULL; *iter = lower->list.next; return lower->dev; } -EXPORT_SYMBOL(netdev_all_lower_get_next); -/** - * netdev_all_lower_get_next_rcu - Get the next device from all - * lower neighbour list, RCU variant - * @dev: device - * @iter: list_head ** of the current position - * - * Gets the next netdev_adjacent from the dev's all lower neighbour - * list, starting from iter position. The caller must hold RCU read lock. - */ -struct net_device *netdev_all_lower_get_next_rcu(struct net_device *dev, - struct list_head **iter) +int netdev_walk_all_lower_dev(struct net_device *dev, + int (*fn)(struct net_device *dev, + void *data), + void *data) +{ + struct net_device *ldev; + struct list_head *iter; + int ret; + + for (iter = &dev->adj_list.lower, + ldev = netdev_next_lower_dev(dev, &iter); + ldev; + ldev = netdev_next_lower_dev(dev, &iter)) { + /* first is the lower device itself */ + ret = fn(ldev, data); + if (ret) + return ret; + + /* then look at all of its lower devices */ + ret = netdev_walk_all_lower_dev(ldev, fn, data); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev); + +static struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, + struct list_head **iter) { struct netdev_adjacent *lower; - lower = list_first_or_null_rcu(&dev->all_adj_list.lower, - struct netdev_adjacent, list); + lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); + if (&lower->list == &dev->adj_list.lower) + return NULL; - return lower ? lower->dev : NULL; + *iter = &lower->list; + + return lower->dev; } -EXPORT_SYMBOL(netdev_all_lower_get_next_rcu); + +int netdev_walk_all_lower_dev_rcu(struct net_device *dev, + int (*fn)(struct net_device *dev, + void *data), + void *data) +{ + struct net_device *ldev; + struct list_head *iter; + int ret; + + for (iter = &dev->adj_list.lower, + ldev = netdev_next_lower_dev_rcu(dev, &iter); + ldev; + ldev = netdev_next_lower_dev_rcu(dev, &iter)) { + /* first is the lower device itself */ + ret = fn(ldev, data); + if (ret) + return ret; + + /* then look at all of its lower devices */ + ret = netdev_walk_all_lower_dev_rcu(ldev, fn, data); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu); /** * netdev_lower_get_first_private_rcu - Get the first ->private from the @@ -5453,7 +5551,6 @@ static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, static int __netdev_adjacent_dev_insert(struct net_device *dev, struct net_device *adj_dev, - u16 ref_nr, struct list_head *dev_list, void *private, bool master) { @@ -5463,7 +5560,10 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev, adj = __netdev_find_adj(adj_dev, dev_list); if (adj) { - adj->ref_nr += ref_nr; + adj->ref_nr += 1; + pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n", + dev->name, adj_dev->name, adj->ref_nr); + return 0; } @@ -5473,12 +5573,12 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev, adj->dev = adj_dev; adj->master = master; - adj->ref_nr = ref_nr; + adj->ref_nr = 1; adj->private = private; dev_hold(adj_dev); - pr_debug("dev_hold for %s, because of link added from %s to %s\n", - adj_dev->name, dev->name, adj_dev->name); + pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n", + dev->name, adj_dev->name, adj->ref_nr, adj_dev->name); if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); @@ -5517,17 +5617,22 @@ static void __netdev_adjacent_dev_remove(struct net_device *dev, { struct netdev_adjacent *adj; + pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n", + dev->name, adj_dev->name, ref_nr); + adj = __netdev_find_adj(adj_dev, dev_list); if (!adj) { - pr_err("tried to remove device %s from %s\n", + pr_err("Adjacency does not exist for device %s from %s\n", dev->name, adj_dev->name); - BUG(); + WARN_ON(1); + return; } if (adj->ref_nr > ref_nr) { - pr_debug("%s to %s ref_nr-%d = %d\n", dev->name, adj_dev->name, - ref_nr, adj->ref_nr-ref_nr); + pr_debug("adjacency: %s to %s ref_nr - %d = %d\n", + dev->name, adj_dev->name, ref_nr, + adj->ref_nr - ref_nr); adj->ref_nr -= ref_nr; return; } @@ -5539,7 +5644,7 @@ static void __netdev_adjacent_dev_remove(struct net_device *dev, netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); list_del_rcu(&adj->list); - pr_debug("dev_put for %s, because link removed from %s to %s\n", + pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n", adj_dev->name, dev->name, adj_dev->name); dev_put(adj_dev); kfree_rcu(adj, rcu); @@ -5547,38 +5652,27 @@ static void __netdev_adjacent_dev_remove(struct net_device *dev, static int __netdev_adjacent_dev_link_lists(struct net_device *dev, struct net_device *upper_dev, - u16 ref_nr, struct list_head *up_list, struct list_head *down_list, void *private, bool master) { int ret; - ret = __netdev_adjacent_dev_insert(dev, upper_dev, ref_nr, up_list, + ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private, master); if (ret) return ret; - ret = __netdev_adjacent_dev_insert(upper_dev, dev, ref_nr, down_list, + ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private, false); if (ret) { - __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list); + __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list); return ret; } return 0; } -static int __netdev_adjacent_dev_link(struct net_device *dev, - struct net_device *upper_dev, - u16 ref_nr) -{ - return __netdev_adjacent_dev_link_lists(dev, upper_dev, ref_nr, - &dev->all_adj_list.upper, - &upper_dev->all_adj_list.lower, - NULL, false); -} - static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, struct net_device *upper_dev, u16 ref_nr, @@ -5589,40 +5683,19 @@ static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list); } -static void __netdev_adjacent_dev_unlink(struct net_device *dev, - struct net_device *upper_dev, - u16 ref_nr) -{ - __netdev_adjacent_dev_unlink_lists(dev, upper_dev, ref_nr, - &dev->all_adj_list.upper, - &upper_dev->all_adj_list.lower); -} - static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, struct net_device *upper_dev, void *private, bool master) { - int ret = __netdev_adjacent_dev_link(dev, upper_dev, 1); - - if (ret) - return ret; - - ret = __netdev_adjacent_dev_link_lists(dev, upper_dev, 1, - &dev->adj_list.upper, - &upper_dev->adj_list.lower, - private, master); - if (ret) { - __netdev_adjacent_dev_unlink(dev, upper_dev, 1); - return ret; - } - - return 0; + return __netdev_adjacent_dev_link_lists(dev, upper_dev, + &dev->adj_list.upper, + &upper_dev->adj_list.lower, + private, master); } static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, struct net_device *upper_dev) { - __netdev_adjacent_dev_unlink(dev, upper_dev, 1); __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1, &dev->adj_list.upper, &upper_dev->adj_list.lower); @@ -5633,7 +5706,6 @@ static int __netdev_upper_dev_link(struct net_device *dev, void *upper_priv, void *upper_info) { struct netdev_notifier_changeupper_info changeupper_info; - struct netdev_adjacent *i, *j, *to_i, *to_j; int ret = 0; ASSERT_RTNL(); @@ -5642,10 +5714,10 @@ static int __netdev_upper_dev_link(struct net_device *dev, return -EBUSY; /* To prevent loops, check if dev is not upper device to upper_dev. */ - if (__netdev_find_adj(dev, &upper_dev->all_adj_list.upper)) + if (netdev_has_upper_dev(upper_dev, dev)) return -EBUSY; - if (__netdev_find_adj(upper_dev, &dev->adj_list.upper)) + if (netdev_has_upper_dev(dev, upper_dev)) return -EEXIST; if (master && netdev_master_upper_dev_get(dev)) @@ -5667,80 +5739,15 @@ static int __netdev_upper_dev_link(struct net_device *dev, if (ret) return ret; - /* Now that we linked these devs, make all the upper_dev's - * all_adj_list.upper visible to every dev's all_adj_list.lower an - * versa, and don't forget the devices itself. All of these - * links are non-neighbours. - */ - list_for_each_entry(i, &dev->all_adj_list.lower, list) { - list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) { - pr_debug("Interlinking %s with %s, non-neighbour\n", - i->dev->name, j->dev->name); - ret = __netdev_adjacent_dev_link(i->dev, j->dev, i->ref_nr); - if (ret) - goto rollback_mesh; - } - } - - /* add dev to every upper_dev's upper device */ - list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { - pr_debug("linking %s's upper device %s with %s\n", - upper_dev->name, i->dev->name, dev->name); - ret = __netdev_adjacent_dev_link(dev, i->dev, i->ref_nr); - if (ret) - goto rollback_upper_mesh; - } - - /* add upper_dev to every dev's lower device */ - list_for_each_entry(i, &dev->all_adj_list.lower, list) { - pr_debug("linking %s's lower device %s with %s\n", dev->name, - i->dev->name, upper_dev->name); - ret = __netdev_adjacent_dev_link(i->dev, upper_dev, i->ref_nr); - if (ret) - goto rollback_lower_mesh; - } - ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev, &changeupper_info.info); ret = notifier_to_errno(ret); if (ret) - goto rollback_lower_mesh; + goto rollback; return 0; -rollback_lower_mesh: - to_i = i; - list_for_each_entry(i, &dev->all_adj_list.lower, list) { - if (i == to_i) - break; - __netdev_adjacent_dev_unlink(i->dev, upper_dev, i->ref_nr); - } - - i = NULL; - -rollback_upper_mesh: - to_i = i; - list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { - if (i == to_i) - break; - __netdev_adjacent_dev_unlink(dev, i->dev, i->ref_nr); - } - - i = j = NULL; - -rollback_mesh: - to_i = i; - to_j = j; - list_for_each_entry(i, &dev->all_adj_list.lower, list) { - list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) { - if (i == to_i && j == to_j) - break; - __netdev_adjacent_dev_unlink(i->dev, j->dev, i->ref_nr); - } - if (i == to_i) - break; - } - +rollback: __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); return ret; @@ -5797,7 +5804,6 @@ void netdev_upper_dev_unlink(struct net_device *dev, struct net_device *upper_dev) { struct netdev_notifier_changeupper_info changeupper_info; - struct netdev_adjacent *i, *j; ASSERT_RTNL(); changeupper_info.upper_dev = upper_dev; @@ -5809,23 +5815,6 @@ void netdev_upper_dev_unlink(struct net_device *dev, __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); - /* Here is the tricky part. We must remove all dev's lower - * devices from all upper_dev's upper devices and vice - * versa, to maintain the graph relationship. - */ - list_for_each_entry(i, &dev->all_adj_list.lower, list) - list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) - __netdev_adjacent_dev_unlink(i->dev, j->dev, i->ref_nr); - - /* remove also the devices itself from lower/upper device - * list - */ - list_for_each_entry(i, &dev->all_adj_list.lower, list) - __netdev_adjacent_dev_unlink(i->dev, upper_dev, i->ref_nr); - - list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) - __netdev_adjacent_dev_unlink(dev, i->dev, i->ref_nr); - call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev, &changeupper_info.info); } @@ -6649,6 +6638,7 @@ static void rollback_registered_many(struct list_head *head) /* Notifier chain MUST detach us all upper devices. */ WARN_ON(netdev_has_any_upper_dev(dev)); + WARN_ON(netdev_has_any_lower_dev(dev)); /* Remove entries from kobject tree */ netdev_unregister_kobject(dev); @@ -7527,8 +7517,6 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, INIT_LIST_HEAD(&dev->link_watch_list); INIT_LIST_HEAD(&dev->adj_list.upper); INIT_LIST_HEAD(&dev->adj_list.lower); - INIT_LIST_HEAD(&dev->all_adj_list.upper); - INIT_LIST_HEAD(&dev->all_adj_list.lower); INIT_LIST_HEAD(&dev->ptype_all); INIT_LIST_HEAD(&dev->ptype_specific); #ifdef CONFIG_NET_SCHED