Commit 1ac9ad13 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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 ab35cd4b (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: default avatarNeil Jones <neiljay@gmail.com>
Signed-off-by: default avatarEric 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: default avatarDavid S. Miller <davem@davemloft.net>
parent 1949e084

drivers/net/gianfar.c

+4 −6
Original line number Diff line number Diff line
@@ -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;

drivers/net/gianfar.h

+10 −0
Original line number Diff line number Diff line
@@ -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;

drivers/net/ixgbe/ixgbe_main.c

+16 −7
Original line number Diff line number Diff line
@@ -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;

drivers/net/macvtap.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

include/linux/netdevice.h

+0 −5
Original line number Diff line number Diff line
@@ -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;

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