From 28c719260da032c999ecb4b73ba56311c635ef4e Mon Sep 17 00:00:00 2001 From: dingtianhong Date: Tue, 15 Oct 2013 16:28:39 +0800 Subject: bonding: use RCU protection for alb xmit path The commit 278b20837511776dc9d5f6ee1c7fabd5479838bb (bonding: initial RCU conversion) has convert the roundrobin, active-backup, broadcast and xor xmit path to rcu protection, the performance will be better for these mode, so this time, convert xmit path for alb mode. Signed-off-by: Ding Tianhong Signed-off-by: Yang Yingliang Cc: Nikolay Aleksandrov Cc: Veaceslav Falico Signed-off-by: David S. Miller diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index 576ccea..0287240 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -230,7 +230,7 @@ static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) max_gap = LLONG_MIN; /* Find the slave with the largest gap */ - bond_for_each_slave(bond, slave, iter) { + bond_for_each_slave_rcu(bond, slave, iter) { if (SLAVE_IS_OK(slave)) { long long gap = compute_gap(slave); @@ -412,6 +412,39 @@ static struct slave *rlb_next_rx_slave(struct bonding *bond) return rx_slave; } +/* Caller must hold rcu_read_lock() for read */ +static struct slave *__rlb_next_rx_slave(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct slave *before = NULL, *rx_slave = NULL, *slave; + struct list_head *iter; + bool found = false; + + bond_for_each_slave_rcu(bond, slave, iter) { + if (!SLAVE_IS_OK(slave)) + continue; + if (!found) { + if (!before || before->speed < slave->speed) + before = slave; + } else { + if (!rx_slave || rx_slave->speed < slave->speed) + rx_slave = slave; + } + if (slave == bond_info->rx_slave) + found = true; + } + /* we didn't find anything after the current or we have something + * better before and up to the current slave + */ + if (!rx_slave || (before && rx_slave->speed < before->speed)) + rx_slave = before; + + if (rx_slave) + bond_info->rx_slave = rx_slave; + + return rx_slave; +} + /* teach the switch the mac of a disabled slave * on the primary for fault tolerance * @@ -628,12 +661,14 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon { struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); struct arp_pkt *arp = arp_pkt(skb); - struct slave *assigned_slave; + struct slave *assigned_slave, *curr_active_slave; struct rlb_client_info *client_info; u32 hash_index = 0; _lock_rx_hashtbl(bond); + curr_active_slave = rcu_dereference(bond->curr_active_slave); + hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); client_info = &(bond_info->rx_hashtbl[hash_index]); @@ -658,14 +693,14 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon * that the new client can be assigned to this entry. */ if (bond->curr_active_slave && - client_info->slave != bond->curr_active_slave) { - client_info->slave = bond->curr_active_slave; + client_info->slave != curr_active_slave) { + client_info->slave = curr_active_slave; rlb_update_client(client_info); } } } /* assign a new slave */ - assigned_slave = rlb_next_rx_slave(bond); + assigned_slave = __rlb_next_rx_slave(bond); if (assigned_slave) { if (!(client_info->assigned && @@ -728,7 +763,7 @@ static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) /* Don't modify or load balance ARPs that do not originate locally * (e.g.,arrive via a bridge). */ - if (!bond_slave_has_mac(bond, arp->mac_src)) + if (!bond_slave_has_mac_rcu(bond, arp->mac_src)) return NULL; if (arp->op_code == htons(ARPOP_REPLY)) { @@ -1343,11 +1378,6 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) skb_reset_mac_header(skb); eth_data = eth_hdr(skb); - /* make sure that the curr_active_slave do not change during tx - */ - read_lock(&bond->lock); - read_lock(&bond->curr_slave_lock); - switch (ntohs(skb->protocol)) { case ETH_P_IP: { const struct iphdr *iph = ip_hdr(skb); @@ -1429,12 +1459,12 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) if (!tx_slave) { /* unbalanced or unassigned, send through primary */ - tx_slave = bond->curr_active_slave; + tx_slave = rcu_dereference(bond->curr_active_slave); bond_info->unbalanced_load += skb->len; } if (tx_slave && SLAVE_IS_OK(tx_slave)) { - if (tx_slave != bond->curr_active_slave) { + if (tx_slave != rcu_dereference(bond->curr_active_slave)) { memcpy(eth_data->h_source, tx_slave->dev->dev_addr, ETH_ALEN); @@ -1449,8 +1479,6 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) } } - read_unlock(&bond->curr_slave_lock); - read_unlock(&bond->lock); if (res) { /* no suitable interface, frame not sent */ kfree_skb(skb); diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h index 0bd04fb..bb5c731 100644 --- a/drivers/net/bonding/bonding.h +++ b/drivers/net/bonding/bonding.h @@ -464,6 +464,20 @@ static inline struct slave *bond_slave_has_mac(struct bonding *bond, return NULL; } +/* Caller must hold rcu_read_lock() for read */ +static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond, + const u8 *mac) +{ + struct list_head *iter; + struct slave *tmp; + + bond_for_each_slave_rcu(bond, tmp, iter) + if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr)) + return tmp; + + return NULL; +} + /* Check if the ip is present in arp ip list, or first free slot if ip == 0 * Returns -1 if not found, index if found */ -- cgit v0.10.2