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net: remove dev_txq_stats_fold() 

After recent changes, (percpu stats on vlan/tunnels...), we dont need
anymore per struct netdev_queue tx_bytes/tx_packets/tx_dropped counters.

Only remaining users are ixgbe, sch_teql, gianfar & macvlan :

1) ixgbe can be converted to use existing tx_ring counters.

2) macvlan incremented txq->tx_dropped, it can use the
dev->stats.tx_dropped counter.

3) sch_teql : almost revert ab35cd4b8f (Use net_device internal stats)
    Now we have ndo_get_stats64(), use it, even for "unsigned long"
fields (No need to bring back a struct net_device_stats)

4) gianfar adds a stats structure per tx queue to hold
tx_bytes/tx_packets

This removes a lockdep warning (and possible lockup) in rndis gadget,
calling dev_get_stats() from hard IRQ context.

Ref: http://www.spinics.net/lists/netdev/msg149202.html

Reported-by: Neil Jones <neiljay@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Jarek Poplawski <jarkao2@gmail.com>
CC: Alexander Duyck <alexander.h.duyck@intel.com>
CC: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
CC: Sandeep Gopalpet <sandeep.kumar@freescale.com>
CC: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-01-12 12:13:14 +00:00 committed by David S. Miller
parent 1949e084bf
commit 1ac9ad1394
7 changed files with 52 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/gianfar.c
View File

@ -433,7 +433,6 @@ static void gfar_init_mac(struct net_device *ndev)
static struct net_device_stats *gfar_get_stats(struct net_device *dev)
{
struct gfar_private *priv = netdev_priv(dev);
struct netdev_queue *txq;
unsigned long rx_packets = 0, rx_bytes = 0, rx_dropped = 0;
unsigned long tx_packets = 0, tx_bytes = 0;
int i = 0;
@ -449,9 +448,8 @@ static struct net_device_stats *gfar_get_stats(struct net_device *dev)
dev->stats.rx_dropped = rx_dropped;
for (i = 0; i < priv->num_tx_queues; i++) {
txq = netdev_get_tx_queue(dev, i);
tx_bytes += txq->tx_bytes;
tx_packets += txq->tx_packets;
tx_bytes += priv->tx_queue[i]->stats.tx_bytes;
tx_packets += priv->tx_queue[i]->stats.tx_packets;
}
dev->stats.tx_bytes = tx_bytes;
@ -2108,8 +2106,8 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
}
/* Update transmit stats */
txq->tx_bytes += skb->len;
txq->tx_packets ++;
tx_queue->stats.tx_bytes += skb->len;
tx_queue->stats.tx_packets++;
txbdp = txbdp_start = tx_queue->cur_tx;
lstatus = txbdp->lstatus;

10
drivers/net/gianfar.h
View File

@ -907,12 +907,21 @@ enum {
MQ_MG_MODE
};
/*
* Per TX queue stats
*/
struct tx_q_stats {
unsigned long tx_packets;
unsigned long tx_bytes;
};
/**
* struct gfar_priv_tx_q - per tx queue structure
* @txlock: per queue tx spin lock
* @tx_skbuff:skb pointers
* @skb_curtx: to be used skb pointer
* @skb_dirtytx:the last used skb pointer
* @stats: bytes/packets stats
* @qindex: index of this queue
* @dev: back pointer to the dev structure
* @grp: back pointer to the group to which this queue belongs
@ -934,6 +943,7 @@ struct gfar_priv_tx_q {
struct txbd8 *tx_bd_base;
struct txbd8 *cur_tx;
struct txbd8 *dirty_tx;
struct tx_q_stats stats;
struct net_device *dev;
struct gfar_priv_grp *grp;
u16 skb_curtx;

23
drivers/net/ixgbe/ixgbe_main.c
View File

@ -6667,8 +6667,6 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
struct ixgbe_adapter *adapter,
struct ixgbe_ring *tx_ring)
{
struct net_device *netdev = tx_ring->netdev;
struct netdev_queue *txq;
unsigned int first;
unsigned int tx_flags = 0;
u8 hdr_len = 0;
@ -6765,9 +6763,6 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
/* add the ATR filter if ATR is on */
if (test_bit(__IXGBE_TX_FDIR_INIT_DONE, &tx_ring->state))
ixgbe_atr(tx_ring, skb, tx_flags, protocol);
txq = netdev_get_tx_queue(netdev, tx_ring->queue_index);
txq->tx_bytes += skb->len;
txq->tx_packets++;
ixgbe_tx_queue(tx_ring, tx_flags, count, skb->len, hdr_len);
ixgbe_maybe_stop_tx(tx_ring, DESC_NEEDED);
@ -6925,8 +6920,6 @@ static struct rtnl_link_stats64 *ixgbe_get_stats64(struct net_device *netdev,
struct ixgbe_adapter *adapter = netdev_priv(netdev);
int i;
/* accurate rx/tx bytes/packets stats */
dev_txq_stats_fold(netdev, stats);
rcu_read_lock();
for (i = 0; i < adapter->num_rx_queues; i++) {
struct ixgbe_ring *ring = ACCESS_ONCE(adapter->rx_ring[i]);
@ -6943,6 +6936,22 @@ static struct rtnl_link_stats64 *ixgbe_get_stats64(struct net_device *netdev,
stats->rx_bytes += bytes;
}
}
for (i = 0; i < adapter->num_tx_queues; i++) {
struct ixgbe_ring *ring = ACCESS_ONCE(adapter->tx_ring[i]);
u64 bytes, packets;
unsigned int start;
if (ring) {
do {
start = u64_stats_fetch_begin_bh(&ring->syncp);
packets = ring->stats.packets;
bytes = ring->stats.bytes;
} while (u64_stats_fetch_retry_bh(&ring->syncp, start));
stats->tx_packets += packets;
stats->tx_bytes += bytes;
}
}
rcu_read_unlock();
/* following stats updated by ixgbe_watchdog_task() */
stats->multicast = netdev->stats.multicast;

2
drivers/net/macvtap.c
View File

@ -585,7 +585,7 @@ err:
rcu_read_lock_bh();
vlan = rcu_dereference(q->vlan);
if (vlan)
netdev_get_tx_queue(vlan->dev, 0)->tx_dropped++;
vlan->dev->stats.tx_dropped++;
rcu_read_unlock_bh();
return err;

5
include/linux/netdevice.h
View File

@ -520,9 +520,6 @@ struct netdev_queue {
* please use this field instead of dev->trans_start
*/
unsigned long trans_start;
u64 tx_bytes;
u64 tx_packets;
u64 tx_dropped;
} ____cacheline_aligned_in_smp;
static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
@ -2265,8 +2262,6 @@ extern void dev_load(struct net *net, const char *name);
extern void dev_mcast_init(void);
extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
struct rtnl_link_stats64 *storage);
extern void dev_txq_stats_fold(const struct net_device *dev,
struct rtnl_link_stats64 *stats);
extern int netdev_max_backlog;
extern int netdev_tstamp_prequeue;

29
net/core/dev.c
View File

@ -5523,34 +5523,6 @@ void netdev_run_todo(void)
}
}
/**
* dev_txq_stats_fold - fold tx_queues stats
* @dev: device to get statistics from
* @stats: struct rtnl_link_stats64 to hold results
*/
void dev_txq_stats_fold(const struct net_device *dev,
struct rtnl_link_stats64 *stats)
{
u64 tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
unsigned int i;
struct netdev_queue *txq;
for (i = 0; i < dev->num_tx_queues; i++) {
txq = netdev_get_tx_queue(dev, i);
spin_lock_bh(&txq->_xmit_lock);
tx_bytes += txq->tx_bytes;
tx_packets += txq->tx_packets;
tx_dropped += txq->tx_dropped;
spin_unlock_bh(&txq->_xmit_lock);
}
if (tx_bytes || tx_packets || tx_dropped) {
stats->tx_bytes = tx_bytes;
stats->tx_packets = tx_packets;
stats->tx_dropped = tx_dropped;
}
}
EXPORT_SYMBOL(dev_txq_stats_fold);
/* Convert net_device_stats to rtnl_link_stats64. They have the same
* fields in the same order, with only the type differing.
*/
@ -5594,7 +5566,6 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
} else {
netdev_stats_to_stats64(storage, &dev->stats);
dev_txq_stats_fold(dev, storage);
}
storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
return storage;

26
net/sched/sch_teql.c
View File

@ -59,6 +59,10 @@ struct teql_master
struct net_device *dev;
struct Qdisc *slaves;
struct list_head master_list;
unsigned long tx_bytes;
unsigned long tx_packets;
unsigned long tx_errors;
unsigned long tx_dropped;
};
struct teql_sched_data
@ -274,7 +278,6 @@ static inline int teql_resolve(struct sk_buff *skb,
static netdev_tx_t teql_master_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct teql_master *master = netdev_priv(dev);
struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
struct Qdisc *start, *q;
int busy;
int nores;
@ -314,8 +317,8 @@ restart:
__netif_tx_unlock(slave_txq);
master->slaves = NEXT_SLAVE(q);
netif_wake_queue(dev);
txq->tx_packets++;
txq->tx_bytes += length;
master->tx_packets++;
master->tx_bytes += length;
return NETDEV_TX_OK;
}
__netif_tx_unlock(slave_txq);
@ -342,10 +345,10 @@ restart:
netif_stop_queue(dev);
return NETDEV_TX_BUSY;
}
dev->stats.tx_errors++;
master->tx_errors++;
drop:
txq->tx_dropped++;
master->tx_dropped++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
@ -398,6 +401,18 @@ static int teql_master_close(struct net_device *dev)
return 0;
}
static struct rtnl_link_stats64 *teql_master_stats64(struct net_device *dev,
struct rtnl_link_stats64 *stats)
{
struct teql_master *m = netdev_priv(dev);
stats->tx_packets = m->tx_packets;
stats->tx_bytes = m->tx_bytes;
stats->tx_errors = m->tx_errors;
stats->tx_dropped = m->tx_dropped;
return stats;
}
static int teql_master_mtu(struct net_device *dev, int new_mtu)
{
struct teql_master *m = netdev_priv(dev);
@ -422,6 +437,7 @@ static const struct net_device_ops teql_netdev_ops = {
.ndo_open = teql_master_open,
.ndo_stop = teql_master_close,
.ndo_start_xmit = teql_master_xmit,
.ndo_get_stats64 = teql_master_stats64,
.ndo_change_mtu = teql_master_mtu,
};