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igb: fix stats handling

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There are currently some problems with igb.

- On 32bit arches, maintaining 64bit counters without proper
synchronization between writers and readers.

- Stats updated every two seconds, as reported by Jesper.
   (Jesper provided a patch for this)

- Potential problem between worker thread and ethtool -S

This patch uses u64_stats_sync, and convert everything to be 64bit safe,
SMP safe, even on 32bit arches. It integrates Jesper idea of providing
accurate stats at the time user reads them.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Tested-by: Emil Tantilov <emil.s.tantilov@intel.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:
Eric Dumazet 2010-10-15 17:27:10 +00:00 committed by David S. Miller
parent dce87b960c
commit 12dcd86b75
3 changed files with 129 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/net/igb/igb.h
View File

@ -159,6 +159,7 @@ struct igb_tx_queue_stats {
u64 packets;
u64 bytes;
u64 restart_queue;
u64 restart_queue2;
};
struct igb_rx_queue_stats {
@ -210,11 +211,14 @@ struct igb_ring {
/* TX */
struct {
struct igb_tx_queue_stats tx_stats;
struct u64_stats_sync tx_syncp;
struct u64_stats_sync tx_syncp2;
bool detect_tx_hung;
};
/* RX */
struct {
struct igb_rx_queue_stats rx_stats;
struct u64_stats_sync rx_syncp;
u32 rx_buffer_len;
};
};
@ -288,6 +292,9 @@ struct igb_adapter {
struct timecompare compare;
struct hwtstamp_config hwtstamp_config;
spinlock_t stats64_lock;
struct rtnl_link_stats64 stats64;
/* structs defined in e1000_hw.h */
struct e1000_hw hw;
struct e1000_hw_stats stats;
@ -357,7 +364,7 @@ extern netdev_tx_t igb_xmit_frame_ring_adv(struct sk_buff *, struct igb_ring *);
extern void igb_unmap_and_free_tx_resource(struct igb_ring *,
struct igb_buffer *);
extern void igb_alloc_rx_buffers_adv(struct igb_ring *, int);
extern void igb_update_stats(struct igb_adapter *);
extern void igb_update_stats(struct igb_adapter *, struct rtnl_link_stats64 *);
extern bool igb_has_link(struct igb_adapter *adapter);
extern void igb_set_ethtool_ops(struct net_device *);
extern void igb_power_up_link(struct igb_adapter *);

52
drivers/net/igb/igb_ethtool.c
View File

@ -90,8 +90,8 @@ static const struct igb_stats igb_gstrings_stats[] = {
#define IGB_NETDEV_STAT(_net_stat) { \
.stat_string = __stringify(_net_stat), \
.sizeof_stat = FIELD_SIZEOF(struct net_device_stats, _net_stat), \
.stat_offset = offsetof(struct net_device_stats, _net_stat) \
.sizeof_stat = FIELD_SIZEOF(struct rtnl_link_stats64, _net_stat), \
.stat_offset = offsetof(struct rtnl_link_stats64, _net_stat) \
}
static const struct igb_stats igb_gstrings_net_stats[] = {
IGB_NETDEV_STAT(rx_errors),
@ -111,8 +111,9 @@ static const struct igb_stats igb_gstrings_net_stats[] = {
(sizeof(igb_gstrings_net_stats) / sizeof(struct igb_stats))
#define IGB_RX_QUEUE_STATS_LEN \
(sizeof(struct igb_rx_queue_stats) / sizeof(u64))
#define IGB_TX_QUEUE_STATS_LEN \
(sizeof(struct igb_tx_queue_stats) / sizeof(u64))
#define IGB_TX_QUEUE_STATS_LEN 3 /* packets, bytes, restart_queue */
#define IGB_QUEUE_STATS_LEN \
((((struct igb_adapter *)netdev_priv(netdev))->num_rx_queues * \
IGB_RX_QUEUE_STATS_LEN) + \
@ -2070,12 +2071,14 @@ static void igb_get_ethtool_stats(struct net_device *netdev,
struct ethtool_stats *stats, u64 *data)
{
struct igb_adapter *adapter = netdev_priv(netdev);
struct net_device_stats *net_stats = &netdev->stats;
u64 *queue_stat;
int i, j, k;
struct rtnl_link_stats64 *net_stats = &adapter->stats64;
unsigned int start;
struct igb_ring *ring;
int i, j;
char *p;
igb_update_stats(adapter);
spin_lock(&adapter->stats64_lock);
igb_update_stats(adapter, net_stats);
for (i = 0; i < IGB_GLOBAL_STATS_LEN; i++) {
p = (char *)adapter + igb_gstrings_stats[i].stat_offset;
@ -2088,15 +2091,36 @@ static void igb_get_ethtool_stats(struct net_device *netdev,
sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
}
for (j = 0; j < adapter->num_tx_queues; j++) {
queue_stat = (u64 *)&adapter->tx_ring[j]->tx_stats;
for (k = 0; k < IGB_TX_QUEUE_STATS_LEN; k++, i++)
data[i] = queue_stat[k];
u64 restart2;
ring = adapter->tx_ring[j];
do {
start = u64_stats_fetch_begin_bh(&ring->tx_syncp);
data[i] = ring->tx_stats.packets;
data[i+1] = ring->tx_stats.bytes;
data[i+2] = ring->tx_stats.restart_queue;
} while (u64_stats_fetch_retry_bh(&ring->tx_syncp, start));
do {
start = u64_stats_fetch_begin_bh(&ring->tx_syncp2);
restart2 = ring->tx_stats.restart_queue2;
} while (u64_stats_fetch_retry_bh(&ring->tx_syncp2, start));
data[i+2] += restart2;
i += IGB_TX_QUEUE_STATS_LEN;
}
for (j = 0; j < adapter->num_rx_queues; j++) {
queue_stat = (u64 *)&adapter->rx_ring[j]->rx_stats;
for (k = 0; k < IGB_RX_QUEUE_STATS_LEN; k++, i++)
data[i] = queue_stat[k];
ring = adapter->rx_ring[j];
do {
start = u64_stats_fetch_begin_bh(&ring->rx_syncp);
data[i] = ring->rx_stats.packets;
data[i+1] = ring->rx_stats.bytes;
data[i+2] = ring->rx_stats.drops;
data[i+3] = ring->rx_stats.csum_err;
data[i+4] = ring->rx_stats.alloc_failed;
} while (u64_stats_fetch_retry_bh(&ring->rx_syncp, start));
i += IGB_RX_QUEUE_STATS_LEN;
}
spin_unlock(&adapter->stats64_lock);
}
static void igb_get_strings(struct net_device *netdev, u32 stringset, u8 *data)

113
drivers/net/igb/igb_main.c
View File

@ -96,7 +96,6 @@ static int igb_setup_all_rx_resources(struct igb_adapter *);
static void igb_free_all_tx_resources(struct igb_adapter *);
static void igb_free_all_rx_resources(struct igb_adapter *);
static void igb_setup_mrqc(struct igb_adapter *);
void igb_update_stats(struct igb_adapter *);
static int igb_probe(struct pci_dev *, const struct pci_device_id *);
static void __devexit igb_remove(struct pci_dev *pdev);
static int igb_sw_init(struct igb_adapter *);
@ -113,7 +112,8 @@ static void igb_update_phy_info(unsigned long);
static void igb_watchdog(unsigned long);
static void igb_watchdog_task(struct work_struct *);
static netdev_tx_t igb_xmit_frame_adv(struct sk_buff *skb, struct net_device *);
static struct net_device_stats *igb_get_stats(struct net_device *);
static struct rtnl_link_stats64 *igb_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *stats);
static int igb_change_mtu(struct net_device *, int);
static int igb_set_mac(struct net_device *, void *);
static void igb_set_uta(struct igb_adapter *adapter);
@ -1536,7 +1536,9 @@ void igb_down(struct igb_adapter *adapter)
netif_carrier_off(netdev);
/* record the stats before reset*/
igb_update_stats(adapter);
spin_lock(&adapter->stats64_lock);
igb_update_stats(adapter, &adapter->stats64);
spin_unlock(&adapter->stats64_lock);
adapter->link_speed = 0;
adapter->link_duplex = 0;
@ -1689,7 +1691,7 @@ static const struct net_device_ops igb_netdev_ops = {
.ndo_open = igb_open,
.ndo_stop = igb_close,
.ndo_start_xmit = igb_xmit_frame_adv,
.ndo_get_stats = igb_get_stats,
.ndo_get_stats64 = igb_get_stats64,
.ndo_set_rx_mode = igb_set_rx_mode,
.ndo_set_multicast_list = igb_set_rx_mode,
.ndo_set_mac_address = igb_set_mac,
@ -2276,6 +2278,7 @@ static int __devinit igb_sw_init(struct igb_adapter *adapter)
adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
spin_lock_init(&adapter->stats64_lock);
#ifdef CONFIG_PCI_IOV
if (hw->mac.type == e1000_82576)
adapter->vfs_allocated_count = (max_vfs > 7) ? 7 : max_vfs;
@ -3483,7 +3486,9 @@ static void igb_watchdog_task(struct work_struct *work)
}
}
igb_update_stats(adapter);
spin_lock(&adapter->stats64_lock);
igb_update_stats(adapter, &adapter->stats64);
spin_unlock(&adapter->stats64_lock);
for (i = 0; i < adapter->num_tx_queues; i++) {
struct igb_ring *tx_ring = adapter->tx_ring[i];
@ -3550,6 +3555,8 @@ static void igb_update_ring_itr(struct igb_q_vector *q_vector)
int new_val = q_vector->itr_val;
int avg_wire_size = 0;
struct igb_adapter *adapter = q_vector->adapter;
struct igb_ring *ring;
unsigned int packets;
/* For non-gigabit speeds, just fix the interrupt rate at 4000
* ints/sec - ITR timer value of 120 ticks.
@ -3559,16 +3566,21 @@ static void igb_update_ring_itr(struct igb_q_vector *q_vector)
goto set_itr_val;
}
if (q_vector->rx_ring && q_vector->rx_ring->total_packets) {
struct igb_ring *ring = q_vector->rx_ring;
avg_wire_size = ring->total_bytes / ring->total_packets;
ring = q_vector->rx_ring;
if (ring) {
packets = ACCESS_ONCE(ring->total_packets);
if (packets)
avg_wire_size = ring->total_bytes / packets;
}
if (q_vector->tx_ring && q_vector->tx_ring->total_packets) {
struct igb_ring *ring = q_vector->tx_ring;
avg_wire_size = max_t(u32, avg_wire_size,
(ring->total_bytes /
ring->total_packets));
ring = q_vector->tx_ring;
if (ring) {
packets = ACCESS_ONCE(ring->total_packets);
if (packets)
avg_wire_size = max_t(u32, avg_wire_size,
ring->total_bytes / packets);
}
/* if avg_wire_size isn't set no work was done */
@ -4077,7 +4089,11 @@ static int __igb_maybe_stop_tx(struct igb_ring *tx_ring, int size)
/* A reprieve! */
netif_wake_subqueue(netdev, tx_ring->queue_index);
tx_ring->tx_stats.restart_queue++;
u64_stats_update_begin(&tx_ring->tx_syncp2);
tx_ring->tx_stats.restart_queue2++;
u64_stats_update_end(&tx_ring->tx_syncp2);
return 0;
}
@ -4214,16 +4230,22 @@ static void igb_reset_task(struct work_struct *work)
}
/**
* igb_get_stats - Get System Network Statistics
* igb_get_stats64 - Get System Network Statistics
* @netdev: network interface device structure
* @stats: rtnl_link_stats64 pointer
*
* Returns the address of the device statistics structure.
* The statistics are actually updated from the timer callback.
**/
static struct net_device_stats *igb_get_stats(struct net_device *netdev)
static struct rtnl_link_stats64 *igb_get_stats64(struct net_device *netdev,
struct rtnl_link_stats64 *stats)
{
/* only return the current stats */
return &netdev->stats;
struct igb_adapter *adapter = netdev_priv(netdev);
spin_lock(&adapter->stats64_lock);
igb_update_stats(adapter, &adapter->stats64);
memcpy(stats, &adapter->stats64, sizeof(*stats));
spin_unlock(&adapter->stats64_lock);
return stats;
}
/**
@ -4305,15 +4327,17 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
* @adapter: board private structure
**/
void igb_update_stats(struct igb_adapter *adapter)
void igb_update_stats(struct igb_adapter *adapter,
struct rtnl_link_stats64 *net_stats)
{
struct net_device_stats *net_stats = igb_get_stats(adapter->netdev);
struct e1000_hw *hw = &adapter->hw;
struct pci_dev *pdev = adapter->pdev;
u32 reg, mpc;
u16 phy_tmp;
int i;
u64 bytes, packets;
unsigned int start;
u64 _bytes, _packets;
#define PHY_IDLE_ERROR_COUNT_MASK 0x00FF
@ -4331,10 +4355,17 @@ void igb_update_stats(struct igb_adapter *adapter)
for (i = 0; i < adapter->num_rx_queues; i++) {
u32 rqdpc_tmp = rd32(E1000_RQDPC(i)) & 0x0FFF;
struct igb_ring *ring = adapter->rx_ring[i];
ring->rx_stats.drops += rqdpc_tmp;
net_stats->rx_fifo_errors += rqdpc_tmp;
bytes += ring->rx_stats.bytes;
packets += ring->rx_stats.packets;
do {
start = u64_stats_fetch_begin_bh(&ring->rx_syncp);
_bytes = ring->rx_stats.bytes;
_packets = ring->rx_stats.packets;
} while (u64_stats_fetch_retry_bh(&ring->rx_syncp, start));
bytes += _bytes;
packets += _packets;
}
net_stats->rx_bytes = bytes;
@ -4344,8 +4375,13 @@ void igb_update_stats(struct igb_adapter *adapter)
packets = 0;
for (i = 0; i < adapter->num_tx_queues; i++) {
struct igb_ring *ring = adapter->tx_ring[i];
bytes += ring->tx_stats.bytes;
packets += ring->tx_stats.packets;
do {
start = u64_stats_fetch_begin_bh(&ring->tx_syncp);
_bytes = ring->tx_stats.bytes;
_packets = ring->tx_stats.packets;
} while (u64_stats_fetch_retry_bh(&ring->tx_syncp, start));
bytes += _bytes;
packets += _packets;
}
net_stats->tx_bytes = bytes;
net_stats->tx_packets = packets;
@ -5397,7 +5433,10 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector)
if (__netif_subqueue_stopped(netdev, tx_ring->queue_index) &&
!(test_bit(__IGB_DOWN, &adapter->state))) {
netif_wake_subqueue(netdev, tx_ring->queue_index);
u64_stats_update_begin(&tx_ring->tx_syncp);
tx_ring->tx_stats.restart_queue++;
u64_stats_update_end(&tx_ring->tx_syncp);
}
}
@ -5437,8 +5476,10 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector)
}
tx_ring->total_bytes += total_bytes;
tx_ring->total_packets += total_packets;
u64_stats_update_begin(&tx_ring->tx_syncp);
tx_ring->tx_stats.bytes += total_bytes;
tx_ring->tx_stats.packets += total_packets;
u64_stats_update_end(&tx_ring->tx_syncp);
return count < tx_ring->count;
}
@ -5480,9 +5521,11 @@ static inline void igb_rx_checksum_adv(struct igb_ring *ring,
* packets, (aka let the stack check the crc32c)
*/
if ((skb->len == 60) &&
(ring->flags & IGB_RING_FLAG_RX_SCTP_CSUM))
(ring->flags & IGB_RING_FLAG_RX_SCTP_CSUM)) {
u64_stats_update_begin(&ring->rx_syncp);
ring->rx_stats.csum_err++;
u64_stats_update_end(&ring->rx_syncp);
}
/* let the stack verify checksum errors */
return;
}
@ -5669,8 +5712,10 @@ next_desc:
rx_ring->total_packets += total_packets;
rx_ring->total_bytes += total_bytes;
u64_stats_update_begin(&rx_ring->rx_syncp);
rx_ring->rx_stats.packets += total_packets;
rx_ring->rx_stats.bytes += total_bytes;
u64_stats_update_end(&rx_ring->rx_syncp);
return cleaned;
}
@ -5698,8 +5743,10 @@ void igb_alloc_rx_buffers_adv(struct igb_ring *rx_ring, int cleaned_count)
if ((bufsz < IGB_RXBUFFER_1024) && !buffer_info->page_dma) {
if (!buffer_info->page) {
buffer_info->page = netdev_alloc_page(netdev);
if (!buffer_info->page) {
if (unlikely(!buffer_info->page)) {
u64_stats_update_begin(&rx_ring->rx_syncp);
rx_ring->rx_stats.alloc_failed++;
u64_stats_update_end(&rx_ring->rx_syncp);
goto no_buffers;
}
buffer_info->page_offset = 0;
@ -5714,7 +5761,9 @@ void igb_alloc_rx_buffers_adv(struct igb_ring *rx_ring, int cleaned_count)
if (dma_mapping_error(rx_ring->dev,
buffer_info->page_dma)) {
buffer_info->page_dma = 0;
u64_stats_update_begin(&rx_ring->rx_syncp);
rx_ring->rx_stats.alloc_failed++;
u64_stats_update_end(&rx_ring->rx_syncp);
goto no_buffers;
}
}
@ -5722,8 +5771,10 @@ void igb_alloc_rx_buffers_adv(struct igb_ring *rx_ring, int cleaned_count)
skb = buffer_info->skb;
if (!skb) {
skb = netdev_alloc_skb_ip_align(netdev, bufsz);
if (!skb) {
if (unlikely(!skb)) {
u64_stats_update_begin(&rx_ring->rx_syncp);
rx_ring->rx_stats.alloc_failed++;
u64_stats_update_end(&rx_ring->rx_syncp);
goto no_buffers;
}
@ -5737,7 +5788,9 @@ void igb_alloc_rx_buffers_adv(struct igb_ring *rx_ring, int cleaned_count)
if (dma_mapping_error(rx_ring->dev,
buffer_info->dma)) {
buffer_info->dma = 0;
u64_stats_update_begin(&rx_ring->rx_syncp);
rx_ring->rx_stats.alloc_failed++;
u64_stats_update_end(&rx_ring->rx_syncp);
goto no_buffers;
}
}