bond_alb: don't disable softirq under bond_alb_xmit

No need to lock soft irqs under bond_alb_xmit()
which already has softirq disabled.

Changes:
1. add non-bh/bh version to tlb_clear_slave()

2. represent BH and non BH hash table locks
_lock_rx_hashtbl_bh/_unlock_rx_hashtbl_bh
_lock_rx_hashtbl/_unlock_rx_hashtbl
_lock_tx_hashtbl_bh/_unlock_tx_hashtbl_bh
_lock_tx_hashtbl/_unlock_tx_hashtbl

Signed-off-by: Maxim Uvarov <maxim.uvarov@oracle.com>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 106b88a..342626f 100644 (file)
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -99,16 +99,26 @@ static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
 
 /*********************** tlb specific functions ***************************/
 
-static inline void _lock_tx_hashtbl(struct bonding *bond)
+static inline void _lock_tx_hashtbl_bh(struct bonding *bond)
 {
        spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
 }
 
-static inline void _unlock_tx_hashtbl(struct bonding *bond)
+static inline void _unlock_tx_hashtbl_bh(struct bonding *bond)
 {
        spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
 }
 
+static inline void _lock_tx_hashtbl(struct bonding *bond)
+{
+       spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
+}
+
+static inline void _unlock_tx_hashtbl(struct bonding *bond)
+{
+       spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
+}
+
 /* Caller must hold tx_hashtbl lock */
 static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
 {
@@ -129,14 +139,13 @@ static inline void tlb_init_slave(struct slave *slave)
        SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
 }
 
-/* Caller must hold bond lock for read */
-static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load)
+/* Caller must hold bond lock for read, BH disabled */
+static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
+                        int save_load)
 {
        struct tlb_client_info *tx_hash_table;
        u32 index;
 
-       _lock_tx_hashtbl(bond);
-
        /* clear slave from tx_hashtbl */
        tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
 
@@ -151,8 +160,15 @@ static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_
        }
 
        tlb_init_slave(slave);
+}
 
-       _unlock_tx_hashtbl(bond);
+/* Caller must hold bond lock for read */
+static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
+                        int save_load)
+{
+       _lock_tx_hashtbl_bh(bond);
+       __tlb_clear_slave(bond, slave, save_load);
+       _unlock_tx_hashtbl_bh(bond);
 }
 
 /* Must be called before starting the monitor timer */
@@ -169,7 +185,7 @@ static int tlb_initialize(struct bonding *bond)
                       bond->dev->name);
                return -1;
        }
-       _lock_tx_hashtbl(bond);
+       _lock_tx_hashtbl_bh(bond);
 
        bond_info->tx_hashtbl = new_hashtbl;
 
@@ -177,7 +193,7 @@ static int tlb_initialize(struct bonding *bond)
                tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
        }
 
-       _unlock_tx_hashtbl(bond);
+       _unlock_tx_hashtbl_bh(bond);
 
        return 0;
 }
@@ -187,12 +203,12 @@ static void tlb_deinitialize(struct bonding *bond)
 {
        struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 
-       _lock_tx_hashtbl(bond);
+       _lock_tx_hashtbl_bh(bond);
 
        kfree(bond_info->tx_hashtbl);
        bond_info->tx_hashtbl = NULL;
 
-       _unlock_tx_hashtbl(bond);
+       _unlock_tx_hashtbl_bh(bond);
 }
 
 static long long compute_gap(struct slave *slave)
@@ -226,15 +242,13 @@ static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
        return least_loaded;
 }
 
-/* Caller must hold bond lock for read */
-static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len)
+static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
+                                               u32 skb_len)
 {
        struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
        struct tlb_client_info *hash_table;
        struct slave *assigned_slave;
 
-       _lock_tx_hashtbl(bond);
-
        hash_table = bond_info->tx_hashtbl;
        assigned_slave = hash_table[hash_index].tx_slave;
        if (!assigned_slave) {
@@ -263,22 +277,46 @@ static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u3
                hash_table[hash_index].tx_bytes += skb_len;
        }
 
-       _unlock_tx_hashtbl(bond);
-
        return assigned_slave;
 }
 
+/* Caller must hold bond lock for read */
+static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
+                                       u32 skb_len)
+{
+       struct slave *tx_slave;
+       /*
+        * We don't need to disable softirq here, becase
+        * tlb_choose_channel() is only called by bond_alb_xmit()
+        * which already has softirq disabled.
+        */
+       _lock_tx_hashtbl(bond);
+       tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
+       _unlock_tx_hashtbl(bond);
+       return tx_slave;
+}
+
 /*********************** rlb specific functions ***************************/
-static inline void _lock_rx_hashtbl(struct bonding *bond)
+static inline void _lock_rx_hashtbl_bh(struct bonding *bond)
 {
        spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
 }
 
-static inline void _unlock_rx_hashtbl(struct bonding *bond)
+static inline void _unlock_rx_hashtbl_bh(struct bonding *bond)
 {
        spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
 }
 
+static inline void _lock_rx_hashtbl(struct bonding *bond)
+{
+       spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
+}
+
+static inline void _unlock_rx_hashtbl(struct bonding *bond)
+{
+       spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
+}
+
 /* when an ARP REPLY is received from a client update its info
  * in the rx_hashtbl
  */
@@ -288,7 +326,7 @@ static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
        struct rlb_client_info *client_info;
        u32 hash_index;
 
-       _lock_rx_hashtbl(bond);
+       _lock_rx_hashtbl_bh(bond);
 
        hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
        client_info = &(bond_info->rx_hashtbl[hash_index]);
@@ -303,7 +341,7 @@ static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
                bond_info->rx_ntt = 1;
        }
 
-       _unlock_rx_hashtbl(bond);
+       _unlock_rx_hashtbl_bh(bond);
 }
 
 static void rlb_arp_recv(struct sk_buff *skb, struct bonding *bond,
@@ -401,7 +439,7 @@ static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
        u32 index, next_index;
 
        /* clear slave from rx_hashtbl */
-       _lock_rx_hashtbl(bond);
+       _lock_rx_hashtbl_bh(bond);
 
        rx_hash_table = bond_info->rx_hashtbl;
        index = bond_info->rx_hashtbl_head;
@@ -432,7 +470,7 @@ static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
                }
        }
 
-       _unlock_rx_hashtbl(bond);
+       _unlock_rx_hashtbl_bh(bond);
 
        write_lock_bh(&bond->curr_slave_lock);
 
@@ -489,7 +527,7 @@ static void rlb_update_rx_clients(struct bonding *bond)
        struct rlb_client_info *client_info;
        u32 hash_index;
 
-       _lock_rx_hashtbl(bond);
+       _lock_rx_hashtbl_bh(bond);
 
        hash_index = bond_info->rx_hashtbl_head;
        for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
@@ -507,7 +545,7 @@ static void rlb_update_rx_clients(struct bonding *bond)
         */
        bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
 
-       _unlock_rx_hashtbl(bond);
+       _unlock_rx_hashtbl_bh(bond);
 }
 
 /* The slave was assigned a new mac address - update the clients */
@@ -518,7 +556,7 @@ static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *sla
        int ntt = 0;
        u32 hash_index;
 
-       _lock_rx_hashtbl(bond);
+       _lock_rx_hashtbl_bh(bond);
 
        hash_index = bond_info->rx_hashtbl_head;
        for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
@@ -538,7 +576,7 @@ static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *sla
                bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
        }
 
-       _unlock_rx_hashtbl(bond);
+       _unlock_rx_hashtbl_bh(bond);
 }
 
 /* mark all clients using src_ip to be updated */
@@ -709,7 +747,7 @@ static void rlb_rebalance(struct bonding *bond)
        int ntt;
        u32 hash_index;
 
-       _lock_rx_hashtbl(bond);
+       _lock_rx_hashtbl_bh(bond);
 
        ntt = 0;
        hash_index = bond_info->rx_hashtbl_head;
@@ -727,7 +765,7 @@ static void rlb_rebalance(struct bonding *bond)
        if (ntt) {
                bond_info->rx_ntt = 1;
        }
-       _unlock_rx_hashtbl(bond);
+       _unlock_rx_hashtbl_bh(bond);
 }
 
 /* Caller must hold rx_hashtbl lock */
@@ -751,7 +789,7 @@ static int rlb_initialize(struct bonding *bond)
                       bond->dev->name);
                return -1;
        }
-       _lock_rx_hashtbl(bond);
+       _lock_rx_hashtbl_bh(bond);
 
        bond_info->rx_hashtbl = new_hashtbl;
 
@@ -761,7 +799,7 @@ static int rlb_initialize(struct bonding *bond)
                rlb_init_table_entry(bond_info->rx_hashtbl + i);
        }
 
-       _unlock_rx_hashtbl(bond);
+       _unlock_rx_hashtbl_bh(bond);
 
        /* register to receive ARPs */
        bond->recv_probe = rlb_arp_recv;
@@ -773,13 +811,13 @@ static void rlb_deinitialize(struct bonding *bond)
 {
        struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
 
-       _lock_rx_hashtbl(bond);
+       _lock_rx_hashtbl_bh(bond);
 
        kfree(bond_info->rx_hashtbl);
        bond_info->rx_hashtbl = NULL;
        bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
 
-       _unlock_rx_hashtbl(bond);
+       _unlock_rx_hashtbl_bh(bond);
 }
 
 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
@@ -787,7 +825,7 @@ static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
        struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
        u32 curr_index;
 
-       _lock_rx_hashtbl(bond);
+       _lock_rx_hashtbl_bh(bond);
 
        curr_index = bond_info->rx_hashtbl_head;
        while (curr_index != RLB_NULL_INDEX) {
@@ -812,7 +850,7 @@ static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
                curr_index = next_index;
        }
 
-       _unlock_rx_hashtbl(bond);
+       _unlock_rx_hashtbl_bh(bond);
 }
 
 /*********************** tlb/rlb shared functions *********************/
@@ -1320,7 +1358,9 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
                res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
        } else {
                if (tx_slave) {
-                       tlb_clear_slave(bond, tx_slave, 0);
+                       _lock_tx_hashtbl(bond);
+                       __tlb_clear_slave(bond, tx_slave, 0);
+                       _unlock_tx_hashtbl(bond);
                }
        }