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bonding: allow use of tx hashing in balance-alb

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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>
This commit is contained in:
Debabrata Banerjee 2018-05-14 14:48:09 -04:00 committed by David S. Miller
parent cbeeea70de
commit e79c105574
4 changed files with 43 additions and 15 deletions
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20
drivers/net/bonding/bond_alb.c
View File

@ -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);

25
drivers/net/bonding/bond_main.c
View File

@ -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 {

2
drivers/net/bonding/bond_options.c
View File

@ -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,

11
include/net/bonding.h
View File

@ -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)