bonding: allow use of tx hashing in balance-alb

The rx load balancing provided by balance-alb is not mutually
exclusive with using hashing for tx selection, and should provide a decent
speed increase because this eliminates spinlocks and cache contention.

Signed-off-by: Debabrata Banerjee <dbanerje@akamai.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 67fd1af..e82108c 100644 (file)
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -1478,8 +1478,24 @@ netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
        }
 
        if (do_tx_balance) {
-               hash_index = _simple_hash(hash_start, hash_size);
-               tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
+               if (bond->params.tlb_dynamic_lb) {
+                       hash_index = _simple_hash(hash_start, hash_size);
+                       tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
+               } else {
+                       /*
+                        * do_tx_balance means we are free to select the tx_slave
+                        * So we do exactly what tlb would do for hash selection
+                        */
+
+                       struct bond_up_slave *slaves;
+                       unsigned int count;
+
+                       slaves = rcu_dereference(bond->slave_arr);
+                       count = slaves ? READ_ONCE(slaves->count) : 0;
+                       if (likely(count))
+                               tx_slave = slaves->arr[bond_xmit_hash(bond, skb) %
+                                                      count];
+               }
        }
 
        return bond_do_alb_xmit(skb, bond, tx_slave);

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 4176e1d..a4cd7f6 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -159,7 +159,7 @@ module_param(min_links, int, 0);
 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 
 module_param(xmit_hash_policy, charp, 0);
-MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
+MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
                                   "0 for layer 2 (default), 1 for layer 3+4, "
                                   "2 for layer 2+3, 3 for encap layer 2+3, "
                                   "4 for encap layer 3+4");
@@ -1735,7 +1735,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
                unblock_netpoll_tx();
        }
 
-       if (bond_mode_uses_xmit_hash(bond))
+       if (bond_mode_can_use_xmit_hash(bond))
                bond_update_slave_arr(bond, NULL);
 
        bond->nest_level = dev_get_nest_level(bond_dev);
@@ -1870,7 +1870,7 @@ static int __bond_release_one(struct net_device *bond_dev,
        if (BOND_MODE(bond) == BOND_MODE_8023AD)
                bond_3ad_unbind_slave(slave);
 
-       if (bond_mode_uses_xmit_hash(bond))
+       if (bond_mode_can_use_xmit_hash(bond))
                bond_update_slave_arr(bond, slave);
 
        netdev_info(bond_dev, "Releasing %s interface %s\n",
@@ -3102,7 +3102,7 @@ static int bond_slave_netdev_event(unsigned long event,
                 * events. If these (miimon/arpmon) parameters are configured
                 * then array gets refreshed twice and that should be fine!
                 */
-               if (bond_mode_uses_xmit_hash(bond))
+               if (bond_mode_can_use_xmit_hash(bond))
                        bond_update_slave_arr(bond, NULL);
                break;
        case NETDEV_CHANGEMTU:
@@ -3322,7 +3322,7 @@ static int bond_open(struct net_device *bond_dev)
                 */
                if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
                        return -ENOMEM;
-               if (bond->params.tlb_dynamic_lb)
+               if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
                        queue_delayed_work(bond->wq, &bond->alb_work, 0);
        }
 
@@ -3341,7 +3341,7 @@ static int bond_open(struct net_device *bond_dev)
                bond_3ad_initiate_agg_selection(bond, 1);
        }
 
-       if (bond_mode_uses_xmit_hash(bond))
+       if (bond_mode_can_use_xmit_hash(bond))
                bond_update_slave_arr(bond, NULL);
 
        return 0;
@@ -3894,7 +3894,7 @@ err:
  * to determine the slave interface -
  * (a) BOND_MODE_8023AD
  * (b) BOND_MODE_XOR
- * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
+ * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
  *
  * The caller is expected to hold RTNL only and NO other lock!
  */
@@ -3947,6 +3947,11 @@ int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
                        continue;
                if (skipslave == slave)
                        continue;
+
+               netdev_dbg(bond->dev,
+                          "Adding slave dev %s to tx hash array[%d]\n",
+                          slave->dev->name, new_arr->count);
+
                new_arr->arr[new_arr->count++] = slave;
        }
 
@@ -4324,9 +4329,9 @@ static int bond_check_params(struct bond_params *params)
        }
 
        if (xmit_hash_policy) {
-               if ((bond_mode != BOND_MODE_XOR) &&
-                   (bond_mode != BOND_MODE_8023AD) &&
-                   (bond_mode != BOND_MODE_TLB)) {
+               if (bond_mode == BOND_MODE_ROUNDROBIN ||
+                   bond_mode == BOND_MODE_ACTIVEBACKUP ||
+                   bond_mode == BOND_MODE_BROADCAST) {
                        pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
                                bond_mode_name(bond_mode));
                } else {

diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index 58c705f..8a945c9 100644 (file)
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -395,7 +395,7 @@ static const struct bond_option bond_opts[BOND_OPT_LAST] = {
                .id = BOND_OPT_TLB_DYNAMIC_LB,
                .name = "tlb_dynamic_lb",
                .desc = "Enable dynamic flow shuffling",
-               .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_TLB)),
+               .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_TLB) | BIT(BOND_MODE_ALB)),
                .values = bond_tlb_dynamic_lb_tbl,
                .flags = BOND_OPTFLAG_IFDOWN,
                .set = bond_option_tlb_dynamic_lb_set,

diff --git a/include/net/bonding.h b/include/net/bonding.h
index b522351..808f1d1 100644 (file)
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -285,8 +285,15 @@ static inline bool bond_needs_speed_duplex(const struct bonding *bond)
 
 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
 {
-       return (BOND_MODE(bond) == BOND_MODE_TLB)  &&
-              (bond->params.tlb_dynamic_lb == 0);
+       return (bond_is_lb(bond) && bond->params.tlb_dynamic_lb == 0);
+}
+
+static inline bool bond_mode_can_use_xmit_hash(const struct bonding *bond)
+{
+       return (BOND_MODE(bond) == BOND_MODE_8023AD ||
+               BOND_MODE(bond) == BOND_MODE_XOR ||
+               BOND_MODE(bond) == BOND_MODE_TLB ||
+               BOND_MODE(bond) == BOND_MODE_ALB);
 }
 
 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)