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Revert "igb: reduce CPU0 latency when updating statistics" 

This reverts commit 59361316af.

Due to problems found in additional testing, this causes an illegal
context switch in the RCU read-side critical section.

CC: Dave Jones <davej@codemonkey.org.uk>
CC: Cong Wang <xiyou.wangcong@gmail.com>
CC: Jan Jablonsky <jan.jablonsky@thalesgroup.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeff Kirsher 2019-01-09 09:10:53 -08:00 committed by David S. Miller
parent 5be99560c6
commit 5642e27bf6
3 changed files with 10 additions and 10 deletions
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2
drivers/net/ethernet/intel/igb/igb.h
View File

@ -515,7 +515,7 @@ struct igb_adapter {
/* OS defined structs */
struct pci_dev *pdev;
struct mutex stats64_lock;
spinlock_t stats64_lock;
struct rtnl_link_stats64 stats64;
/* structs defined in e1000_hw.h */

4
drivers/net/ethernet/intel/igb/igb_ethtool.c
View File

@ -2295,7 +2295,7 @@ static void igb_get_ethtool_stats(struct net_device *netdev,
int i, j;
char *p;
mutex_lock(&adapter->stats64_lock);
spin_lock(&adapter->stats64_lock);
igb_update_stats(adapter);
for (i = 0; i < IGB_GLOBAL_STATS_LEN; i++) {
@ -2338,7 +2338,7 @@ static void igb_get_ethtool_stats(struct net_device *netdev,
} while (u64_stats_fetch_retry_irq(&ring->rx_syncp, start));
i += IGB_RX_QUEUE_STATS_LEN;
}
mutex_unlock(&adapter->stats64_lock);
spin_unlock(&adapter->stats64_lock);
}
static void igb_get_strings(struct net_device *netdev, u32 stringset, u8 *data)

14
drivers/net/ethernet/intel/igb/igb_main.c
View File

@ -2203,9 +2203,9 @@ void igb_down(struct igb_adapter *adapter)
del_timer_sync(&adapter->phy_info_timer);
/* record the stats before reset*/
mutex_lock(&adapter->stats64_lock);
spin_lock(&adapter->stats64_lock);
igb_update_stats(adapter);
mutex_unlock(&adapter->stats64_lock);
spin_unlock(&adapter->stats64_lock);
adapter->link_speed = 0;
adapter->link_duplex = 0;
@ -3840,7 +3840,7 @@ static int igb_sw_init(struct igb_adapter *adapter)
adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
spin_lock_init(&adapter->nfc_lock);
mutex_init(&adapter->stats64_lock);
spin_lock_init(&adapter->stats64_lock);
#ifdef CONFIG_PCI_IOV
switch (hw->mac.type) {
case e1000_82576:
@ -5406,9 +5406,9 @@ no_wait:
}
}
mutex_lock(&adapter->stats64_lock);
spin_lock(&adapter->stats64_lock);
igb_update_stats(adapter);
mutex_unlock(&adapter->stats64_lock);
spin_unlock(&adapter->stats64_lock);
for (i = 0; i < adapter->num_tx_queues; i++) {
struct igb_ring *tx_ring = adapter->tx_ring[i];
@ -6235,10 +6235,10 @@ static void igb_get_stats64(struct net_device *netdev,
{
struct igb_adapter *adapter = netdev_priv(netdev);
mutex_lock(&adapter->stats64_lock);
spin_lock(&adapter->stats64_lock);
igb_update_stats(adapter);
memcpy(stats, &adapter->stats64, sizeof(*stats));
mutex_unlock(&adapter->stats64_lock);
spin_unlock(&adapter->stats64_lock);
}
/**