From 9b36627acecd5792e81daf1a3bff8eab39ed45fb Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Tue, 3 May 2016 16:33:14 +0200 Subject: [PATCH] net: remove dev->trans_start previous patches removed all direct accesses to dev->trans_start, so change the netif_trans_update helper to update trans_start of netdev queue 0 instead and then remove trans_start from struct net_device. AFAICS a lot of the netif_trans_update() invocations are now useless because they occur in ndo_start_xmit and driver doesn't set LLTX (i.e. stack already took care of the update). As I can't test any of them it seems better to just leave them alone. Signed-off-by: Florian Westphal Signed-off-by: David S. Miller --- drivers/net/ethernet/intel/i40e/i40e_main.c | 2 +- include/linux/netdevice.h | 15 +++++---------- net/sched/sch_generic.c | 10 +++------- 3 files changed, 9 insertions(+), 18 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 8e6c0f2487d7..f6da6b76e678 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -328,7 +328,7 @@ static void i40e_tx_timeout(struct net_device *netdev) unsigned long trans_start; q = netdev_get_tx_queue(netdev, i); - trans_start = q->trans_start ? : netdev->trans_start; + trans_start = q->trans_start; if (netif_xmit_stopped(q) && time_after(jiffies, (trans_start + netdev->watchdog_timeo))) { diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index f53412cccbaa..63580e6d0df4 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -581,7 +581,7 @@ struct netdev_queue { spinlock_t _xmit_lock ____cacheline_aligned_in_smp; int xmit_lock_owner; /* - * please use this field instead of dev->trans_start + * Time (in jiffies) of last Tx */ unsigned long trans_start; @@ -1545,7 +1545,6 @@ enum netdev_priv_flags { * * @offload_fwd_mark: Offload device fwding mark * - * @trans_start: Time (in jiffies) of last Tx * @watchdog_timeo: Represents the timeout that is used by * the watchdog (see dev_watchdog()) * @watchdog_timer: List of timers @@ -1794,13 +1793,6 @@ struct net_device { #endif /* These may be needed for future network-power-down code. */ - - /* - * trans_start here is expensive for high speed devices on SMP, - * please use netdev_queue->trans_start instead. - */ - unsigned long trans_start; - struct timer_list watchdog_timer; int __percpu *pcpu_refcnt; @@ -3484,7 +3476,10 @@ static inline void txq_trans_update(struct netdev_queue *txq) /* legacy drivers only, netdev_start_xmit() sets txq->trans_start */ static inline void netif_trans_update(struct net_device *dev) { - dev->trans_start = jiffies; + struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); + + if (txq->trans_start != jiffies) + txq->trans_start = jiffies; } /** diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 70182cfe119c..269dd71b3828 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -227,13 +227,12 @@ unsigned long dev_trans_start(struct net_device *dev) if (is_vlan_dev(dev)) dev = vlan_dev_real_dev(dev); - res = dev->trans_start; - for (i = 0; i < dev->num_tx_queues; i++) { + res = netdev_get_tx_queue(dev, 0)->trans_start; + for (i = 1; i < dev->num_tx_queues; i++) { val = netdev_get_tx_queue(dev, i)->trans_start; if (val && time_after(val, res)) res = val; } - dev->trans_start = res; return res; } @@ -256,10 +255,7 @@ static void dev_watchdog(unsigned long arg) struct netdev_queue *txq; txq = netdev_get_tx_queue(dev, i); - /* - * old device drivers set dev->trans_start - */ - trans_start = txq->trans_start ? : dev->trans_start; + trans_start = txq->trans_start; if (netif_xmit_stopped(txq) && time_after(jiffies, (trans_start + dev->watchdog_timeo))) {