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>

1 files changed, 76 insertions, 36 deletions

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 106b88a04738..342626f4bc46 100644
--- 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);
                 }
         }