From 2f268f129c2d1a05d297fe3ee34d393f862d2b22 Mon Sep 17 00:00:00 2001 From: Veaceslav Falico Date: Wed, 25 Sep 2013 09:20:07 +0200 Subject: [PATCH] net: add adj_list to save only neighbours Currently, we distinguish neighbours (first-level linked devices) from non-neighbours by the neighbour bool in the netdev_adjacent. This could be quite time-consuming in case we would like to traverse *only* through neighbours - cause we'd have to traverse through all devices and check for this flag, and in a (quite common) scenario where we have lots of vlans on top of bridge, which is on top of a bond - the bonding would have to go through all those vlans to get its upper neighbour linked devices. This situation is really unpleasant, cause there are already a lot of cases when a device with slaves needs to go through them in hot path. To fix this, introduce a new upper/lower device lists structure - adj_list, which contains only the neighbours. It works always in pair with the all_adj_list structure (renamed from upper/lower_dev_list), i.e. both of them contain the same links, only that all_adj_list contains also non-neighbour device links. It's really a small change visible, currently, only for __netdev_adjacent_dev_insert/remove(), and doesn't change the main linked logic at all. Also, add some comments a fix a name collision in netdev_for_each_upper_dev_rcu() and rework the naming by the following rules: netdev_(all_)(upper|lower)_* If "all_" is present, then we work with the whole list of upper/lower devices, otherwise - only with direct neighbours. Uninline functions - to get better stack traces. CC: "David S. Miller" CC: Eric Dumazet CC: Jiri Pirko CC: Alexander Duyck CC: Cong Wang Signed-off-by: Veaceslav Falico Signed-off-by: David S. Miller --- drivers/net/bonding/bond_alb.c | 2 +- drivers/net/bonding/bond_main.c | 10 +- include/linux/netdevice.h | 28 +++-- net/core/dev.c | 203 ++++++++++++++++---------------- 4 files changed, 129 insertions(+), 114 deletions(-) diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index f428ef57437..8524e33e675 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -1019,7 +1019,7 @@ static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) /* loop through vlans and send one packet for each */ rcu_read_lock(); - netdev_for_each_upper_dev_rcu(bond->dev, upper, iter) { + netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { if (upper->priv_flags & IFF_802_1Q_VLAN) alb_send_lp_vid(slave, mac_addr, vlan_dev_vlan_id(upper)); diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 55bbb8b8200..91c4ab8913b 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2267,7 +2267,7 @@ static bool bond_has_this_ip(struct bonding *bond, __be32 ip) return true; rcu_read_lock(); - netdev_for_each_upper_dev_rcu(bond->dev, upper, iter) { + netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { if (ip == bond_confirm_addr(upper, 0, ip)) { ret = true; break; @@ -2342,10 +2342,12 @@ static void bond_arp_send_all(struct bonding *bond, struct slave *slave) * * TODO: QinQ? */ - netdev_for_each_upper_dev_rcu(bond->dev, vlan_upper, vlan_iter) { + netdev_for_each_all_upper_dev_rcu(bond->dev, vlan_upper, + vlan_iter) { if (!is_vlan_dev(vlan_upper)) continue; - netdev_for_each_upper_dev_rcu(vlan_upper, upper, iter) { + netdev_for_each_all_upper_dev_rcu(vlan_upper, upper, + iter) { if (upper == rt->dst.dev) { vlan_id = vlan_dev_vlan_id(vlan_upper); rcu_read_unlock(); @@ -2358,7 +2360,7 @@ static void bond_arp_send_all(struct bonding *bond, struct slave *slave) * our upper vlans, then just search for any dev that * matches, and in case it's a vlan - save the id */ - netdev_for_each_upper_dev_rcu(bond->dev, upper, iter) { + netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { if (upper == rt->dst.dev) { /* if it's a vlan - get its VID */ if (is_vlan_dev(upper)) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 3de49aca451..514045c704a 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1143,8 +1143,18 @@ struct net_device { struct list_head dev_list; struct list_head napi_list; struct list_head unreg_list; - struct list_head upper_dev_list; /* List of upper devices */ - struct list_head lower_dev_list; + + /* directly linked devices, like slaves for bonding */ + struct { + struct list_head upper; + struct list_head lower; + } adj_list; + + /* all linked devices, *including* neighbours */ + struct { + struct list_head upper; + struct list_head lower; + } all_adj_list; /* currently active device features */ @@ -2813,15 +2823,15 @@ extern int bpf_jit_enable; extern bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev); extern bool netdev_has_any_upper_dev(struct net_device *dev); -extern struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, - struct list_head **iter); +extern struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, + struct list_head **iter); /* iterate through upper list, must be called under RCU read lock */ -#define netdev_for_each_upper_dev_rcu(dev, upper, iter) \ - for (iter = &(dev)->upper_dev_list, \ - upper = netdev_upper_get_next_dev_rcu(dev, &(iter)); \ - upper; \ - upper = netdev_upper_get_next_dev_rcu(dev, &(iter))) +#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))) extern struct net_device *netdev_master_upper_dev_get(struct net_device *dev); extern struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev); diff --git a/net/core/dev.c b/net/core/dev.c index 9be79377a0f..9a395e03da7 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4373,9 +4373,6 @@ struct netdev_adjacent { /* upper master flag, there can only be one master device per list */ bool master; - /* indicates that this dev is our first-level lower/upper device */ - bool neighbour; - /* counter for the number of times this device was added to us */ u16 ref_nr; @@ -4385,29 +4382,17 @@ struct netdev_adjacent { static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev, struct net_device *adj_dev, - struct list_head *dev_list) + struct list_head *adj_list) { struct netdev_adjacent *adj; - list_for_each_entry(adj, dev_list, list) { + list_for_each_entry(adj, adj_list, list) { if (adj->dev == adj_dev) return adj; } return NULL; } -static inline struct netdev_adjacent *__netdev_find_upper(struct net_device *dev, - struct net_device *udev) -{ - return __netdev_find_adj(dev, udev, &dev->upper_dev_list); -} - -static inline struct netdev_adjacent *__netdev_find_lower(struct net_device *dev, - struct net_device *ldev) -{ - return __netdev_find_adj(dev, ldev, &dev->lower_dev_list); -} - /** * netdev_has_upper_dev - Check if device is linked to an upper device * @dev: device @@ -4422,7 +4407,7 @@ bool netdev_has_upper_dev(struct net_device *dev, { ASSERT_RTNL(); - return __netdev_find_upper(dev, upper_dev); + return __netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper); } EXPORT_SYMBOL(netdev_has_upper_dev); @@ -4437,7 +4422,7 @@ bool netdev_has_any_upper_dev(struct net_device *dev) { ASSERT_RTNL(); - return !list_empty(&dev->upper_dev_list); + return !list_empty(&dev->all_adj_list.upper); } EXPORT_SYMBOL(netdev_has_any_upper_dev); @@ -4454,10 +4439,10 @@ struct net_device *netdev_master_upper_dev_get(struct net_device *dev) ASSERT_RTNL(); - if (list_empty(&dev->upper_dev_list)) + if (list_empty(&dev->adj_list.upper)) return NULL; - upper = list_first_entry(&dev->upper_dev_list, + upper = list_first_entry(&dev->adj_list.upper, struct netdev_adjacent, list); if (likely(upper->master)) return upper->dev; @@ -4465,15 +4450,15 @@ struct net_device *netdev_master_upper_dev_get(struct net_device *dev) } EXPORT_SYMBOL(netdev_master_upper_dev_get); -/* netdev_upper_get_next_dev_rcu - Get the next dev from upper list +/* 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_upper_get_next_dev_rcu(struct net_device *dev, - struct list_head **iter) +struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, + struct list_head **iter) { struct netdev_adjacent *upper; @@ -4481,14 +4466,14 @@ struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); - if (&upper->list == &dev->upper_dev_list) + if (&upper->list == &dev->all_adj_list.upper) return NULL; *iter = &upper->list; return upper->dev; } -EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); +EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu); /** * netdev_master_upper_dev_get_rcu - Get master upper device @@ -4501,7 +4486,7 @@ struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) { struct netdev_adjacent *upper; - upper = list_first_or_null_rcu(&dev->upper_dev_list, + upper = list_first_or_null_rcu(&dev->adj_list.upper, struct netdev_adjacent, list); if (upper && likely(upper->master)) return upper->dev; @@ -4512,14 +4497,13 @@ EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); static int __netdev_adjacent_dev_insert(struct net_device *dev, struct net_device *adj_dev, struct list_head *dev_list, - bool neighbour, bool master) + bool master) { struct netdev_adjacent *adj; adj = __netdev_find_adj(dev, adj_dev, dev_list); if (adj) { - BUG_ON(neighbour); adj->ref_nr++; return 0; } @@ -4530,13 +4514,11 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev, adj->dev = adj_dev; adj->master = master; - adj->neighbour = neighbour; adj->ref_nr = 1; - dev_hold(adj_dev); - pr_debug("dev_hold for %s, because of %s link added from %s to %s\n", - adj_dev->name, dev_list == &dev->upper_dev_list ? - "upper" : "lower", dev->name, adj_dev->name); + + pr_debug("dev_hold for %s, because of link added from %s to %s\n", + adj_dev->name, dev->name, adj_dev->name); /* Ensure that master link is always the first item in list. */ if (master) @@ -4547,22 +4529,6 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev, return 0; } -static inline int __netdev_upper_dev_insert(struct net_device *dev, - struct net_device *udev, - bool master, bool neighbour) -{ - return __netdev_adjacent_dev_insert(dev, udev, &dev->upper_dev_list, - neighbour, master); -} - -static inline int __netdev_lower_dev_insert(struct net_device *dev, - struct net_device *ldev, - bool neighbour) -{ - return __netdev_adjacent_dev_insert(dev, ldev, &dev->lower_dev_list, - neighbour, false); -} - void __netdev_adjacent_dev_remove(struct net_device *dev, struct net_device *adj_dev, struct list_head *dev_list) @@ -4571,73 +4537,102 @@ void __netdev_adjacent_dev_remove(struct net_device *dev, adj = __netdev_find_adj(dev, adj_dev, dev_list); - if (!adj) + if (!adj) { + pr_err("tried to remove device %s from %s\n", + dev->name, adj_dev->name); BUG(); + } if (adj->ref_nr > 1) { + pr_debug("%s to %s ref_nr-- = %d\n", dev->name, adj_dev->name, + adj->ref_nr-1); adj->ref_nr--; return; } list_del_rcu(&adj->list); - pr_debug("dev_put for %s, because of %s link removed from %s to %s\n", - adj_dev->name, dev_list == &dev->upper_dev_list ? - "upper" : "lower", dev->name, adj_dev->name); + pr_debug("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); } -static inline void __netdev_upper_dev_remove(struct net_device *dev, - struct net_device *udev) -{ - return __netdev_adjacent_dev_remove(dev, udev, &dev->upper_dev_list); -} - -static inline void __netdev_lower_dev_remove(struct net_device *dev, - struct net_device *ldev) -{ - return __netdev_adjacent_dev_remove(dev, ldev, &dev->lower_dev_list); -} - -int __netdev_adjacent_dev_insert_link(struct net_device *dev, - struct net_device *upper_dev, - bool master, bool neighbour) +int __netdev_adjacent_dev_link_lists(struct net_device *dev, + struct net_device *upper_dev, + struct list_head *up_list, + struct list_head *down_list, + bool master) { int ret; - ret = __netdev_upper_dev_insert(dev, upper_dev, master, neighbour); + ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, master); if (ret) return ret; - ret = __netdev_lower_dev_insert(upper_dev, dev, neighbour); + ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, false); if (ret) { - __netdev_upper_dev_remove(dev, upper_dev); + __netdev_adjacent_dev_remove(dev, upper_dev, up_list); return ret; } return 0; } -static inline int __netdev_adjacent_dev_link(struct net_device *dev, - struct net_device *udev) +int __netdev_adjacent_dev_link(struct net_device *dev, + struct net_device *upper_dev) { - return __netdev_adjacent_dev_insert_link(dev, udev, false, false); + return __netdev_adjacent_dev_link_lists(dev, upper_dev, + &dev->all_adj_list.upper, + &upper_dev->all_adj_list.lower, + false); } -static inline int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, - struct net_device *udev, - bool master) +void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, + struct net_device *upper_dev, + struct list_head *up_list, + struct list_head *down_list) { - return __netdev_adjacent_dev_insert_link(dev, udev, master, true); + __netdev_adjacent_dev_remove(dev, upper_dev, up_list); + __netdev_adjacent_dev_remove(upper_dev, dev, down_list); } void __netdev_adjacent_dev_unlink(struct net_device *dev, struct net_device *upper_dev) { - __netdev_upper_dev_remove(dev, upper_dev); - __netdev_lower_dev_remove(upper_dev, dev); + __netdev_adjacent_dev_unlink_lists(dev, upper_dev, + &dev->all_adj_list.upper, + &upper_dev->all_adj_list.lower); +} + +int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, + struct net_device *upper_dev, + bool master) +{ + int ret = __netdev_adjacent_dev_link(dev, upper_dev); + + if (ret) + return ret; + + ret = __netdev_adjacent_dev_link_lists(dev, upper_dev, + &dev->adj_list.upper, + &upper_dev->adj_list.lower, + master); + if (ret) { + __netdev_adjacent_dev_unlink(dev, upper_dev); + return ret; + } + + return 0; } +void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, + struct net_device *upper_dev) +{ + __netdev_adjacent_dev_unlink(dev, upper_dev); + __netdev_adjacent_dev_unlink_lists(dev, upper_dev, + &dev->adj_list.upper, + &upper_dev->adj_list.lower); +} static int __netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, bool master) @@ -4651,10 +4646,10 @@ 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_upper(upper_dev, dev)) + if (__netdev_find_adj(upper_dev, dev, &upper_dev->all_adj_list.upper)) return -EBUSY; - if (__netdev_find_upper(dev, upper_dev)) + if (__netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper)) return -EEXIST; if (master && netdev_master_upper_dev_get(dev)) @@ -4665,12 +4660,14 @@ static int __netdev_upper_dev_link(struct net_device *dev, return ret; /* Now that we linked these devs, make all the upper_dev's - * upper_dev_list visible to every dev's lower_dev_list and vice + * 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->lower_dev_list, list) { - list_for_each_entry(j, &upper_dev->upper_dev_list, list) { + 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); if (ret) goto rollback_mesh; @@ -4678,14 +4675,18 @@ static int __netdev_upper_dev_link(struct net_device *dev, } /* add dev to every upper_dev's upper device */ - list_for_each_entry(i, &upper_dev->upper_dev_list, list) { + 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); if (ret) goto rollback_upper_mesh; } /* add upper_dev to every dev's lower device */ - list_for_each_entry(i, &dev->lower_dev_list, list) { + 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); if (ret) goto rollback_lower_mesh; @@ -4696,7 +4697,7 @@ static int __netdev_upper_dev_link(struct net_device *dev, rollback_lower_mesh: to_i = i; - list_for_each_entry(i, &dev->lower_dev_list, list) { + list_for_each_entry(i, &dev->all_adj_list.lower, list) { if (i == to_i) break; __netdev_adjacent_dev_unlink(i->dev, upper_dev); @@ -4706,7 +4707,7 @@ rollback_lower_mesh: rollback_upper_mesh: to_i = i; - list_for_each_entry(i, &upper_dev->upper_dev_list, list) { + list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { if (i == to_i) break; __netdev_adjacent_dev_unlink(dev, i->dev); @@ -4717,8 +4718,8 @@ rollback_upper_mesh: rollback_mesh: to_i = i; to_j = j; - list_for_each_entry(i, &dev->lower_dev_list, list) { - list_for_each_entry(j, &upper_dev->upper_dev_list, list) { + 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); @@ -4727,7 +4728,7 @@ rollback_mesh: break; } - __netdev_adjacent_dev_unlink(dev, upper_dev); + __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); return ret; } @@ -4781,23 +4782,23 @@ void netdev_upper_dev_unlink(struct net_device *dev, struct netdev_adjacent *i, *j; ASSERT_RTNL(); - __netdev_adjacent_dev_unlink(dev, upper_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->lower_dev_list, list) - list_for_each_entry(j, &upper_dev->upper_dev_list, list) + 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); /* remove also the devices itself from lower/upper device * list */ - list_for_each_entry(i, &dev->lower_dev_list, list) + list_for_each_entry(i, &dev->all_adj_list.lower, list) __netdev_adjacent_dev_unlink(i->dev, upper_dev); - list_for_each_entry(i, &upper_dev->upper_dev_list, list) + list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) __netdev_adjacent_dev_unlink(dev, i->dev); call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); @@ -6059,8 +6060,10 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, INIT_LIST_HEAD(&dev->napi_list); INIT_LIST_HEAD(&dev->unreg_list); INIT_LIST_HEAD(&dev->link_watch_list); - INIT_LIST_HEAD(&dev->upper_dev_list); - INIT_LIST_HEAD(&dev->lower_dev_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); dev->priv_flags = IFF_XMIT_DST_RELEASE; setup(dev); -- 2.46.0