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:
parent
1949e084bf
commit
1ac9ad1394
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@ -433,7 +433,6 @@ static void gfar_init_mac(struct net_device *ndev)
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static struct net_device_stats *gfar_get_stats(struct net_device *dev)
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{
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struct gfar_private *priv = netdev_priv(dev);
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struct netdev_queue *txq;
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unsigned long rx_packets = 0, rx_bytes = 0, rx_dropped = 0;
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unsigned long tx_packets = 0, tx_bytes = 0;
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int i = 0;
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@ -449,9 +448,8 @@ static struct net_device_stats *gfar_get_stats(struct net_device *dev)
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dev->stats.rx_dropped = rx_dropped;
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for (i = 0; i < priv->num_tx_queues; i++) {
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txq = netdev_get_tx_queue(dev, i);
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tx_bytes += txq->tx_bytes;
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tx_packets += txq->tx_packets;
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tx_bytes += priv->tx_queue[i]->stats.tx_bytes;
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tx_packets += priv->tx_queue[i]->stats.tx_packets;
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}
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dev->stats.tx_bytes = tx_bytes;
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@ -2108,8 +2106,8 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
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}
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/* Update transmit stats */
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txq->tx_bytes += skb->len;
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txq->tx_packets ++;
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tx_queue->stats.tx_bytes += skb->len;
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tx_queue->stats.tx_packets++;
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txbdp = txbdp_start = tx_queue->cur_tx;
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lstatus = txbdp->lstatus;
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@ -907,12 +907,21 @@ enum {
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MQ_MG_MODE
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};
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/*
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* Per TX queue stats
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*/
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struct tx_q_stats {
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unsigned long tx_packets;
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unsigned long tx_bytes;
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};
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/**
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* struct gfar_priv_tx_q - per tx queue structure
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* @txlock: per queue tx spin lock
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* @tx_skbuff:skb pointers
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* @skb_curtx: to be used skb pointer
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* @skb_dirtytx:the last used skb pointer
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* @stats: bytes/packets stats
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* @qindex: index of this queue
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* @dev: back pointer to the dev structure
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* @grp: back pointer to the group to which this queue belongs
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@ -934,6 +943,7 @@ struct gfar_priv_tx_q {
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struct txbd8 *tx_bd_base;
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struct txbd8 *cur_tx;
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struct txbd8 *dirty_tx;
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struct tx_q_stats stats;
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struct net_device *dev;
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struct gfar_priv_grp *grp;
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u16 skb_curtx;
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@ -6667,8 +6667,6 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
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struct ixgbe_adapter *adapter,
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struct ixgbe_ring *tx_ring)
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{
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struct net_device *netdev = tx_ring->netdev;
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struct netdev_queue *txq;
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unsigned int first;
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unsigned int tx_flags = 0;
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u8 hdr_len = 0;
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@ -6765,9 +6763,6 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
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/* add the ATR filter if ATR is on */
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if (test_bit(__IXGBE_TX_FDIR_INIT_DONE, &tx_ring->state))
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ixgbe_atr(tx_ring, skb, tx_flags, protocol);
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txq = netdev_get_tx_queue(netdev, tx_ring->queue_index);
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txq->tx_bytes += skb->len;
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txq->tx_packets++;
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ixgbe_tx_queue(tx_ring, tx_flags, count, skb->len, hdr_len);
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ixgbe_maybe_stop_tx(tx_ring, DESC_NEEDED);
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@ -6925,8 +6920,6 @@ static struct rtnl_link_stats64 *ixgbe_get_stats64(struct net_device *netdev,
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struct ixgbe_adapter *adapter = netdev_priv(netdev);
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int i;
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/* accurate rx/tx bytes/packets stats */
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dev_txq_stats_fold(netdev, stats);
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rcu_read_lock();
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for (i = 0; i < adapter->num_rx_queues; i++) {
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struct ixgbe_ring *ring = ACCESS_ONCE(adapter->rx_ring[i]);
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@ -6943,6 +6936,22 @@ static struct rtnl_link_stats64 *ixgbe_get_stats64(struct net_device *netdev,
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stats->rx_bytes += bytes;
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}
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}
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for (i = 0; i < adapter->num_tx_queues; i++) {
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struct ixgbe_ring *ring = ACCESS_ONCE(adapter->tx_ring[i]);
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u64 bytes, packets;
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unsigned int start;
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if (ring) {
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do {
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start = u64_stats_fetch_begin_bh(&ring->syncp);
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packets = ring->stats.packets;
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bytes = ring->stats.bytes;
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} while (u64_stats_fetch_retry_bh(&ring->syncp, start));
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stats->tx_packets += packets;
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stats->tx_bytes += bytes;
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}
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}
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rcu_read_unlock();
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/* following stats updated by ixgbe_watchdog_task() */
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stats->multicast = netdev->stats.multicast;
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@ -585,7 +585,7 @@ err:
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rcu_read_lock_bh();
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vlan = rcu_dereference(q->vlan);
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if (vlan)
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netdev_get_tx_queue(vlan->dev, 0)->tx_dropped++;
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vlan->dev->stats.tx_dropped++;
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rcu_read_unlock_bh();
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return err;
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@ -520,9 +520,6 @@ struct netdev_queue {
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* please use this field instead of dev->trans_start
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*/
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unsigned long trans_start;
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u64 tx_bytes;
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u64 tx_packets;
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u64 tx_dropped;
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} ____cacheline_aligned_in_smp;
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static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
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@ -2265,8 +2262,6 @@ extern void dev_load(struct net *net, const char *name);
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extern void dev_mcast_init(void);
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extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
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struct rtnl_link_stats64 *storage);
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extern void dev_txq_stats_fold(const struct net_device *dev,
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struct rtnl_link_stats64 *stats);
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extern int netdev_max_backlog;
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extern int netdev_tstamp_prequeue;
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@ -5523,34 +5523,6 @@ void netdev_run_todo(void)
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}
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}
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/**
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* dev_txq_stats_fold - fold tx_queues stats
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* @dev: device to get statistics from
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* @stats: struct rtnl_link_stats64 to hold results
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*/
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void dev_txq_stats_fold(const struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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u64 tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
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unsigned int i;
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struct netdev_queue *txq;
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for (i = 0; i < dev->num_tx_queues; i++) {
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txq = netdev_get_tx_queue(dev, i);
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spin_lock_bh(&txq->_xmit_lock);
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tx_bytes += txq->tx_bytes;
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tx_packets += txq->tx_packets;
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tx_dropped += txq->tx_dropped;
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spin_unlock_bh(&txq->_xmit_lock);
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}
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if (tx_bytes || tx_packets || tx_dropped) {
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stats->tx_bytes = tx_bytes;
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stats->tx_packets = tx_packets;
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stats->tx_dropped = tx_dropped;
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}
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}
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EXPORT_SYMBOL(dev_txq_stats_fold);
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/* Convert net_device_stats to rtnl_link_stats64. They have the same
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* fields in the same order, with only the type differing.
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*/
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@ -5594,7 +5566,6 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
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netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
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} else {
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netdev_stats_to_stats64(storage, &dev->stats);
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dev_txq_stats_fold(dev, storage);
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}
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storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
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return storage;
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@ -59,6 +59,10 @@ struct teql_master
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struct net_device *dev;
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struct Qdisc *slaves;
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struct list_head master_list;
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unsigned long tx_bytes;
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unsigned long tx_packets;
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unsigned long tx_errors;
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unsigned long tx_dropped;
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};
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struct teql_sched_data
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@ -274,7 +278,6 @@ static inline int teql_resolve(struct sk_buff *skb,
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static netdev_tx_t teql_master_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct teql_master *master = netdev_priv(dev);
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struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
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struct Qdisc *start, *q;
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int busy;
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int nores;
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@ -314,8 +317,8 @@ restart:
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__netif_tx_unlock(slave_txq);
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master->slaves = NEXT_SLAVE(q);
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netif_wake_queue(dev);
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txq->tx_packets++;
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txq->tx_bytes += length;
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master->tx_packets++;
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master->tx_bytes += length;
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return NETDEV_TX_OK;
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}
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__netif_tx_unlock(slave_txq);
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@ -342,10 +345,10 @@ restart:
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netif_stop_queue(dev);
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return NETDEV_TX_BUSY;
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}
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dev->stats.tx_errors++;
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master->tx_errors++;
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drop:
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txq->tx_dropped++;
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master->tx_dropped++;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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@ -398,6 +401,18 @@ static int teql_master_close(struct net_device *dev)
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return 0;
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}
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static struct rtnl_link_stats64 *teql_master_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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struct teql_master *m = netdev_priv(dev);
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stats->tx_packets = m->tx_packets;
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stats->tx_bytes = m->tx_bytes;
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stats->tx_errors = m->tx_errors;
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stats->tx_dropped = m->tx_dropped;
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return stats;
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}
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static int teql_master_mtu(struct net_device *dev, int new_mtu)
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{
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struct teql_master *m = netdev_priv(dev);
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@ -422,6 +437,7 @@ static const struct net_device_ops teql_netdev_ops = {
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.ndo_open = teql_master_open,
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.ndo_stop = teql_master_close,
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.ndo_start_xmit = teql_master_xmit,
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.ndo_get_stats64 = teql_master_stats64,
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.ndo_change_mtu = teql_master_mtu,
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};
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