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igc: Change adapter->nfc_rule_lock to mutex 

This patch changes adapter->nfc_rule_lock type from spin_lock to mutex
so we avoid unnecessary busy waiting on lock contention.

A closer look at the execution context of NFC rule API users shows that
all of them run in process context. The API users are: ethtool ops,
igc_configure(), called when interface is brought up by user or reset
workequeue thread, igc_down(), called when interface is brought down,
and igc_remove(), called when driver is unloaded.

Signed-off-by: Andre Guedes <andre.guedes@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Andre Guedes 2020-04-24 13:16:22 -07:00 committed by Jeff Kirsher
parent acda576f72
commit 42fc5dc042
3 changed files with 20 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/intel/igc/igc.h
View File

@ -190,7 +190,7 @@ struct igc_adapter {
/* Any access to elements in nfc_rule_list is protected by the
* nfc_rule_lock.
*/
spinlock_t nfc_rule_lock;
struct mutex nfc_rule_lock;
struct list_head nfc_rule_list;
unsigned int nfc_rule_count;

24
drivers/net/ethernet/intel/igc/igc_ethtool.c
View File

@ -939,7 +939,7 @@ static int igc_ethtool_get_nfc_rule(struct igc_adapter *adapter,
cmd->data = IGC_MAX_RXNFC_RULES;
spin_lock(&adapter->nfc_rule_lock);
mutex_lock(&adapter->nfc_rule_lock);
rule = igc_get_nfc_rule(adapter, fsp->location);
if (!rule)
@ -971,11 +971,11 @@ static int igc_ethtool_get_nfc_rule(struct igc_adapter *adapter,
eth_broadcast_addr(fsp->m_u.ether_spec.h_source);
}
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
return 0;
out:
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
return -EINVAL;
}
@ -988,18 +988,18 @@ static int igc_ethtool_get_nfc_rules(struct igc_adapter *adapter,
cmd->data = IGC_MAX_RXNFC_RULES;
spin_lock(&adapter->nfc_rule_lock);
mutex_lock(&adapter->nfc_rule_lock);
list_for_each_entry(rule, &adapter->nfc_rule_list, list) {
if (cnt == cmd->rule_cnt) {
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
return -EMSGSIZE;
}
rule_locs[cnt] = rule->location;
cnt++;
}
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
cmd->rule_cnt = cnt;
@ -1303,7 +1303,7 @@ static int igc_ethtool_add_nfc_rule(struct igc_adapter *adapter,
igc_ethtool_init_nfc_rule(rule, fsp);
spin_lock(&adapter->nfc_rule_lock);
mutex_lock(&adapter->nfc_rule_lock);
err = igc_ethtool_check_nfc_rule(adapter, rule);
if (err)
@ -1317,11 +1317,11 @@ static int igc_ethtool_add_nfc_rule(struct igc_adapter *adapter,
if (err)
goto err;
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
return 0;
err:
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
kfree(rule);
return err;
}
@ -1333,17 +1333,17 @@ static int igc_ethtool_del_nfc_rule(struct igc_adapter *adapter,
(struct ethtool_rx_flow_spec *)&cmd->fs;
struct igc_nfc_rule *rule;
spin_lock(&adapter->nfc_rule_lock);
mutex_lock(&adapter->nfc_rule_lock);
rule = igc_get_nfc_rule(adapter, fsp->location);
if (!rule) {
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
return -EINVAL;
}
igc_del_nfc_rule(adapter, rule);
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
return 0;
}

14
drivers/net/ethernet/intel/igc/igc_main.c
View File

@ -2539,12 +2539,12 @@ static void igc_flush_nfc_rules(struct igc_adapter *adapter)
{
struct igc_nfc_rule *rule, *tmp;
spin_lock(&adapter->nfc_rule_lock);
mutex_lock(&adapter->nfc_rule_lock);
list_for_each_entry_safe(rule, tmp, &adapter->nfc_rule_list, list)
igc_del_nfc_rule(adapter, rule);
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
}
/**
@ -2583,24 +2583,24 @@ static void igc_restore_nfc_rules(struct igc_adapter *adapter)
{
struct igc_nfc_rule *rule;
spin_lock(&adapter->nfc_rule_lock);
mutex_lock(&adapter->nfc_rule_lock);
list_for_each_entry_reverse(rule, &adapter->nfc_rule_list, list)
igc_enable_nfc_rule(adapter, rule);
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
}
static void igc_nfc_rule_exit(struct igc_adapter *adapter)
{
struct igc_nfc_rule *rule;
spin_lock(&adapter->nfc_rule_lock);
mutex_lock(&adapter->nfc_rule_lock);
list_for_each_entry(rule, &adapter->nfc_rule_list, list)
igc_disable_nfc_rule(adapter, rule);
spin_unlock(&adapter->nfc_rule_lock);
mutex_unlock(&adapter->nfc_rule_lock);
}
static int igc_uc_sync(struct net_device *netdev, const unsigned char *addr)
@ -3573,7 +3573,7 @@ static int igc_sw_init(struct igc_adapter *adapter)
VLAN_HLEN;
adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
spin_lock_init(&adapter->nfc_rule_lock);
mutex_init(&adapter->nfc_rule_lock);
INIT_LIST_HEAD(&adapter->nfc_rule_list);
adapter->nfc_rule_count = 0;