From 932ff279a43ab7257942cddff2595acd541cc49b Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Fri, 9 Jun 2006 12:20:56 -0700 Subject: [PATCH] [NET]: Add netif_tx_lock Various drivers use xmit_lock internally to synchronise with their transmission routines. They do so without setting xmit_lock_owner. This is fine as long as netpoll is not in use. With netpoll it is possible for deadlocks to occur if xmit_lock_owner isn't set. This is because if a printk occurs while xmit_lock is held and xmit_lock_owner is not set can cause netpoll to attempt to take xmit_lock recursively. While it is possible to resolve this by getting netpoll to use trylock, it is suboptimal because netpoll's sole objective is to maximise the chance of getting the printk out on the wire. So delaying or dropping the message is to be avoided as much as possible. So the only alternative is to always set xmit_lock_owner. The following patch does this by introducing the netif_tx_lock family of functions that take care of setting/unsetting xmit_lock_owner. I renamed xmit_lock to _xmit_lock to indicate that it should not be used directly. I didn't provide irq versions of the netif_tx_lock functions since xmit_lock is meant to be a BH-disabling lock. This is pretty much a straight text substitution except for a small bug fix in winbond. It currently uses netif_stop_queue/spin_unlock_wait to stop transmission. This is unsafe as an IRQ can potentially wake up the queue. So it is safer to use netif_tx_disable. The hamradio bits used spin_lock_irq but it is unnecessary as xmit_lock must never be taken in an IRQ handler. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- Documentation/networking/netdevices.txt | 8 ++-- .../infiniband/ulp/ipoib/ipoib_multicast.c | 6 ++- drivers/media/dvb/dvb-core/dvb_net.c | 4 +- drivers/net/bnx2.c | 4 +- drivers/net/bonding/bond_main.c | 2 +- drivers/net/forcedeth.c | 18 ++++----- drivers/net/hamradio/6pack.c | 8 ++-- drivers/net/hamradio/mkiss.c | 8 ++-- drivers/net/ifb.c | 10 ++--- drivers/net/irda/vlsi_ir.c | 2 +- drivers/net/natsemi.c | 4 +- drivers/net/tulip/winbond-840.c | 9 ++--- drivers/net/wireless/orinoco.c | 4 +- include/linux/netdevice.h | 38 +++++++++++++++++-- net/atm/clip.c | 4 +- net/core/dev.c | 12 +++--- net/core/dev_mcast.c | 28 +++++++------- net/core/netpoll.c | 9 ++--- net/core/pktgen.c | 4 +- net/sched/sch_generic.c | 28 ++++++-------- net/sched/sch_teql.c | 9 ++--- 21 files changed, 121 insertions(+), 98 deletions(-) diff --git a/Documentation/networking/netdevices.txt b/Documentation/networking/netdevices.txt index 3c0a5ba614..847cedb238 100644 --- a/Documentation/networking/netdevices.txt +++ b/Documentation/networking/netdevices.txt @@ -42,9 +42,9 @@ dev->get_stats: Context: nominally process, but don't sleep inside an rwlock dev->hard_start_xmit: - Synchronization: dev->xmit_lock spinlock. + Synchronization: netif_tx_lock spinlock. When the driver sets NETIF_F_LLTX in dev->features this will be - called without holding xmit_lock. In this case the driver + called without holding netif_tx_lock. In this case the driver has to lock by itself when needed. It is recommended to use a try lock for this and return -1 when the spin lock fails. The locking there should also properly protect against @@ -62,12 +62,12 @@ dev->hard_start_xmit: Only valid when NETIF_F_LLTX is set. dev->tx_timeout: - Synchronization: dev->xmit_lock spinlock. + Synchronization: netif_tx_lock spinlock. Context: BHs disabled Notes: netif_queue_stopped() is guaranteed true dev->set_multicast_list: - Synchronization: dev->xmit_lock spinlock. + Synchronization: netif_tx_lock spinlock. Context: BHs disabled dev->poll: diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c index 1dae4b2382..1d917edcf9 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c @@ -821,7 +821,8 @@ void ipoib_mcast_restart_task(void *dev_ptr) ipoib_mcast_stop_thread(dev, 0); - spin_lock_irqsave(&dev->xmit_lock, flags); + local_irq_save(flags); + netif_tx_lock(dev); spin_lock(&priv->lock); /* @@ -896,7 +897,8 @@ void ipoib_mcast_restart_task(void *dev_ptr) } spin_unlock(&priv->lock); - spin_unlock_irqrestore(&dev->xmit_lock, flags); + netif_tx_unlock(dev); + local_irq_restore(flags); /* We have to cancel outside of the spinlock */ list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { diff --git a/drivers/media/dvb/dvb-core/dvb_net.c b/drivers/media/dvb/dvb-core/dvb_net.c index 2f0f35811b..9fd87521a1 100644 --- a/drivers/media/dvb/dvb-core/dvb_net.c +++ b/drivers/media/dvb/dvb-core/dvb_net.c @@ -1052,7 +1052,7 @@ static void wq_set_multicast_list (void *data) dvb_net_feed_stop(dev); priv->rx_mode = RX_MODE_UNI; - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); if (dev->flags & IFF_PROMISC) { dprintk("%s: promiscuous mode\n", dev->name); @@ -1077,7 +1077,7 @@ static void wq_set_multicast_list (void *data) } } - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); dvb_net_feed_start(dev); } diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c index 54161aef3c..9c5a8842ed 100644 --- a/drivers/net/bnx2.c +++ b/drivers/net/bnx2.c @@ -2009,7 +2009,7 @@ bnx2_poll(struct net_device *dev, int *budget) return 1; } -/* Called with rtnl_lock from vlan functions and also dev->xmit_lock +/* Called with rtnl_lock from vlan functions and also netif_tx_lock * from set_multicast. */ static void @@ -4252,7 +4252,7 @@ bnx2_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid) } #endif -/* Called with dev->xmit_lock. +/* Called with netif_tx_lock. * hard_start_xmit is pseudo-lockless - a lock is only required when * the tx queue is full. This way, we get the benefit of lockless * operations most of the time without the complexities to handle diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 55d236726d..46326cdfb2 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -4191,7 +4191,7 @@ static int bond_init(struct net_device *bond_dev, struct bond_params *params) */ bond_dev->features |= NETIF_F_VLAN_CHALLENGED; - /* don't acquire bond device's xmit_lock when + /* don't acquire bond device's netif_tx_lock when * transmitting */ bond_dev->features |= NETIF_F_LLTX; diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c index feb5b223cd..5a8651b4b0 100644 --- a/drivers/net/forcedeth.c +++ b/drivers/net/forcedeth.c @@ -533,9 +533,9 @@ typedef union _ring_type { * critical parts: * - rx is (pseudo-) lockless: it relies on the single-threading provided * by the arch code for interrupts. - * - tx setup is lockless: it relies on dev->xmit_lock. Actual submission + * - tx setup is lockless: it relies on netif_tx_lock. Actual submission * needs dev->priv->lock :-( - * - set_multicast_list: preparation lockless, relies on dev->xmit_lock. + * - set_multicast_list: preparation lockless, relies on netif_tx_lock. */ /* in dev: base, irq */ @@ -1213,7 +1213,7 @@ static void drain_ring(struct net_device *dev) /* * nv_start_xmit: dev->hard_start_xmit function - * Called with dev->xmit_lock held. + * Called with netif_tx_lock held. */ static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev) { @@ -1407,7 +1407,7 @@ static void nv_tx_done(struct net_device *dev) /* * nv_tx_timeout: dev->tx_timeout function - * Called with dev->xmit_lock held. + * Called with netif_tx_lock held. */ static void nv_tx_timeout(struct net_device *dev) { @@ -1737,7 +1737,7 @@ static int nv_change_mtu(struct net_device *dev, int new_mtu) * Changing the MTU is a rare event, it shouldn't matter. */ nv_disable_irq(dev); - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); spin_lock(&np->lock); /* stop engines */ nv_stop_rx(dev); @@ -1768,7 +1768,7 @@ static int nv_change_mtu(struct net_device *dev, int new_mtu) nv_start_rx(dev); nv_start_tx(dev); spin_unlock(&np->lock); - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); nv_enable_irq(dev); } return 0; @@ -1803,7 +1803,7 @@ static int nv_set_mac_address(struct net_device *dev, void *addr) memcpy(dev->dev_addr, macaddr->sa_data, ETH_ALEN); if (netif_running(dev)) { - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); spin_lock_irq(&np->lock); /* stop rx engine */ @@ -1815,7 +1815,7 @@ static int nv_set_mac_address(struct net_device *dev, void *addr) /* restart rx engine */ nv_start_rx(dev); spin_unlock_irq(&np->lock); - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); } else { nv_copy_mac_to_hw(dev); } @@ -1824,7 +1824,7 @@ static int nv_set_mac_address(struct net_device *dev, void *addr) /* * nv_set_multicast: dev->set_multicast function - * Called with dev->xmit_lock held. + * Called with netif_tx_lock held. */ static void nv_set_multicast(struct net_device *dev) { diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c index 102c1f0b90..d12605f0ac 100644 --- a/drivers/net/hamradio/6pack.c +++ b/drivers/net/hamradio/6pack.c @@ -308,9 +308,9 @@ static int sp_set_mac_address(struct net_device *dev, void *addr) { struct sockaddr_ax25 *sa = addr; - spin_lock_irq(&dev->xmit_lock); + netif_tx_lock_bh(dev); memcpy(dev->dev_addr, &sa->sax25_call, AX25_ADDR_LEN); - spin_unlock_irq(&dev->xmit_lock); + netif_tx_unlock_bh(dev); return 0; } @@ -767,9 +767,9 @@ static int sixpack_ioctl(struct tty_struct *tty, struct file *file, break; } - spin_lock_irq(&dev->xmit_lock); + netif_tx_lock_bh(dev); memcpy(dev->dev_addr, &addr, AX25_ADDR_LEN); - spin_unlock_irq(&dev->xmit_lock); + netif_tx_unlock_bh(dev); err = 0; break; diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c index d81a8e1eeb..3ebbbe56b6 100644 --- a/drivers/net/hamradio/mkiss.c +++ b/drivers/net/hamradio/mkiss.c @@ -357,9 +357,9 @@ static int ax_set_mac_address(struct net_device *dev, void *addr) { struct sockaddr_ax25 *sa = addr; - spin_lock_irq(&dev->xmit_lock); + netif_tx_lock_bh(dev); memcpy(dev->dev_addr, &sa->sax25_call, AX25_ADDR_LEN); - spin_unlock_irq(&dev->xmit_lock); + netif_tx_unlock_bh(dev); return 0; } @@ -886,9 +886,9 @@ static int mkiss_ioctl(struct tty_struct *tty, struct file *file, break; } - spin_lock_irq(&dev->xmit_lock); + netif_tx_lock_bh(dev); memcpy(dev->dev_addr, addr, AX25_ADDR_LEN); - spin_unlock_irq(&dev->xmit_lock); + netif_tx_unlock_bh(dev); err = 0; break; diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c index 31fb2d75dc..2e222ef91e 100644 --- a/drivers/net/ifb.c +++ b/drivers/net/ifb.c @@ -76,13 +76,13 @@ static void ri_tasklet(unsigned long dev) dp->st_task_enter++; if ((skb = skb_peek(&dp->tq)) == NULL) { dp->st_txq_refl_try++; - if (spin_trylock(&_dev->xmit_lock)) { + if (netif_tx_trylock(_dev)) { dp->st_rxq_enter++; while ((skb = skb_dequeue(&dp->rq)) != NULL) { skb_queue_tail(&dp->tq, skb); dp->st_rx2tx_tran++; } - spin_unlock(&_dev->xmit_lock); + netif_tx_unlock(_dev); } else { /* reschedule */ dp->st_rxq_notenter++; @@ -110,7 +110,7 @@ static void ri_tasklet(unsigned long dev) } } - if (spin_trylock(&_dev->xmit_lock)) { + if (netif_tx_trylock(_dev)) { dp->st_rxq_check++; if ((skb = skb_peek(&dp->rq)) == NULL) { dp->tasklet_pending = 0; @@ -118,10 +118,10 @@ static void ri_tasklet(unsigned long dev) netif_wake_queue(_dev); } else { dp->st_rxq_rsch++; - spin_unlock(&_dev->xmit_lock); + netif_tx_unlock(_dev); goto resched; } - spin_unlock(&_dev->xmit_lock); + netif_tx_unlock(_dev); } else { resched: dp->tasklet_pending = 1; diff --git a/drivers/net/irda/vlsi_ir.c b/drivers/net/irda/vlsi_ir.c index 97a49e0be7..d70b9e8d6e 100644 --- a/drivers/net/irda/vlsi_ir.c +++ b/drivers/net/irda/vlsi_ir.c @@ -959,7 +959,7 @@ static int vlsi_hard_start_xmit(struct sk_buff *skb, struct net_device *ndev) || (now.tv_sec==ready.tv_sec && now.tv_usec>=ready.tv_usec)) break; udelay(100); - /* must not sleep here - we are called under xmit_lock! */ + /* must not sleep here - called under netif_tx_lock! */ } } diff --git a/drivers/net/natsemi.c b/drivers/net/natsemi.c index 90627756d6..2e4ecedba0 100644 --- a/drivers/net/natsemi.c +++ b/drivers/net/natsemi.c @@ -318,12 +318,12 @@ performance critical codepaths: The rx process only runs in the interrupt handler. Access from outside the interrupt handler is only permitted after disable_irq(). -The rx process usually runs under the dev->xmit_lock. If np->intr_tx_reap +The rx process usually runs under the netif_tx_lock. If np->intr_tx_reap is set, then access is permitted under spin_lock_irq(&np->lock). Thus configuration functions that want to access everything must call disable_irq(dev->irq); - spin_lock_bh(dev->xmit_lock); + netif_tx_lock_bh(dev); spin_lock_irq(&np->lock); IV. Notes diff --git a/drivers/net/tulip/winbond-840.c b/drivers/net/tulip/winbond-840.c index 136a70c4d5..56d86c7c03 100644 --- a/drivers/net/tulip/winbond-840.c +++ b/drivers/net/tulip/winbond-840.c @@ -1605,11 +1605,11 @@ static void __devexit w840_remove1 (struct pci_dev *pdev) * - get_stats: * spin_lock_irq(np->lock), doesn't touch hw if not present * - hard_start_xmit: - * netif_stop_queue + spin_unlock_wait(&dev->xmit_lock); + * synchronize_irq + netif_tx_disable; * - tx_timeout: - * netif_device_detach + spin_unlock_wait(&dev->xmit_lock); + * netif_device_detach + netif_tx_disable; * - set_multicast_list - * netif_device_detach + spin_unlock_wait(&dev->xmit_lock); + * netif_device_detach + netif_tx_disable; * - interrupt handler * doesn't touch hw if not present, synchronize_irq waits for * running instances of the interrupt handler. @@ -1635,11 +1635,10 @@ static int w840_suspend (struct pci_dev *pdev, pm_message_t state) netif_device_detach(dev); update_csr6(dev, 0); iowrite32(0, ioaddr + IntrEnable); - netif_stop_queue(dev); spin_unlock_irq(&np->lock); - spin_unlock_wait(&dev->xmit_lock); synchronize_irq(dev->irq); + netif_tx_disable(dev); np->stats.rx_missed_errors += ioread32(ioaddr + RxMissed) & 0xffff; diff --git a/drivers/net/wireless/orinoco.c b/drivers/net/wireless/orinoco.c index c2d0b09e04..a5fcfcde63 100644 --- a/drivers/net/wireless/orinoco.c +++ b/drivers/net/wireless/orinoco.c @@ -1833,7 +1833,9 @@ static int __orinoco_program_rids(struct net_device *dev) /* Set promiscuity / multicast*/ priv->promiscuous = 0; priv->mc_count = 0; - __orinoco_set_multicast_list(dev); /* FIXME: what about the xmit_lock */ + + /* FIXME: what about netif_tx_lock */ + __orinoco_set_multicast_list(dev); return 0; } diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index b5760c67af..067b9ccafd 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -407,7 +407,7 @@ struct net_device * One part is mostly used on xmit path (device) */ /* hard_start_xmit synchronizer */ - spinlock_t xmit_lock ____cacheline_aligned_in_smp; + spinlock_t _xmit_lock ____cacheline_aligned_in_smp; /* cpu id of processor entered to hard_start_xmit or -1, if nobody entered there. */ @@ -893,11 +893,43 @@ static inline void __netif_rx_complete(struct net_device *dev) clear_bit(__LINK_STATE_RX_SCHED, &dev->state); } +static inline void netif_tx_lock(struct net_device *dev) +{ + spin_lock(&dev->_xmit_lock); + dev->xmit_lock_owner = smp_processor_id(); +} + +static inline void netif_tx_lock_bh(struct net_device *dev) +{ + spin_lock_bh(&dev->_xmit_lock); + dev->xmit_lock_owner = smp_processor_id(); +} + +static inline int netif_tx_trylock(struct net_device *dev) +{ + int err = spin_trylock(&dev->_xmit_lock); + if (!err) + dev->xmit_lock_owner = smp_processor_id(); + return err; +} + +static inline void netif_tx_unlock(struct net_device *dev) +{ + dev->xmit_lock_owner = -1; + spin_unlock(&dev->_xmit_lock); +} + +static inline void netif_tx_unlock_bh(struct net_device *dev) +{ + dev->xmit_lock_owner = -1; + spin_unlock_bh(&dev->_xmit_lock); +} + static inline void netif_tx_disable(struct net_device *dev) { - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); netif_stop_queue(dev); - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); } /* These functions live elsewhere (drivers/net/net_init.c, but related) */ diff --git a/net/atm/clip.c b/net/atm/clip.c index 72d8529826..f92f9c94d2 100644 --- a/net/atm/clip.c +++ b/net/atm/clip.c @@ -98,7 +98,7 @@ static void unlink_clip_vcc(struct clip_vcc *clip_vcc) printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); return; } - spin_lock_bh(&entry->neigh->dev->xmit_lock); /* block clip_start_xmit() */ + netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ entry->neigh->used = jiffies; for (walk = &entry->vccs; *walk; walk = &(*walk)->next) if (*walk == clip_vcc) { @@ -122,7 +122,7 @@ static void unlink_clip_vcc(struct clip_vcc *clip_vcc) printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc " "0x%p)\n", entry, clip_vcc); out: - spin_unlock_bh(&entry->neigh->dev->xmit_lock); + netif_tx_unlock_bh(entry->neigh->dev); } /* The neighbour entry n->lock is held. */ diff --git a/net/core/dev.c b/net/core/dev.c index 6bfa78c66c..1b09f1cae4 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1282,15 +1282,13 @@ int __skb_linearize(struct sk_buff *skb, gfp_t gfp_mask) #define HARD_TX_LOCK(dev, cpu) { \ if ((dev->features & NETIF_F_LLTX) == 0) { \ - spin_lock(&dev->xmit_lock); \ - dev->xmit_lock_owner = cpu; \ + netif_tx_lock(dev); \ } \ } #define HARD_TX_UNLOCK(dev) { \ if ((dev->features & NETIF_F_LLTX) == 0) { \ - dev->xmit_lock_owner = -1; \ - spin_unlock(&dev->xmit_lock); \ + netif_tx_unlock(dev); \ } \ } @@ -1389,8 +1387,8 @@ int dev_queue_xmit(struct sk_buff *skb) /* The device has no queue. Common case for software devices: loopback, all the sorts of tunnels... - Really, it is unlikely that xmit_lock protection is necessary here. - (f.e. loopback and IP tunnels are clean ignoring statistics + Really, it is unlikely that netif_tx_lock protection is necessary + here. (f.e. loopback and IP tunnels are clean ignoring statistics counters.) However, it is possible, that they rely on protection made by us here. @@ -2805,7 +2803,7 @@ int register_netdevice(struct net_device *dev) BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); spin_lock_init(&dev->queue_lock); - spin_lock_init(&dev->xmit_lock); + spin_lock_init(&dev->_xmit_lock); dev->xmit_lock_owner = -1; #ifdef CONFIG_NET_CLS_ACT spin_lock_init(&dev->ingress_lock); diff --git a/net/core/dev_mcast.c b/net/core/dev_mcast.c index 05d6085084..c57d887da2 100644 --- a/net/core/dev_mcast.c +++ b/net/core/dev_mcast.c @@ -62,7 +62,7 @@ * Device mc lists are changed by bh at least if IPv6 is enabled, * so that it must be bh protected. * - * We block accesses to device mc filters with dev->xmit_lock. + * We block accesses to device mc filters with netif_tx_lock. */ /* @@ -93,9 +93,9 @@ static void __dev_mc_upload(struct net_device *dev) void dev_mc_upload(struct net_device *dev) { - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); __dev_mc_upload(dev); - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); } /* @@ -107,7 +107,7 @@ int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl) int err = 0; struct dev_mc_list *dmi, **dmip; - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); for (dmip = &dev->mc_list; (dmi = *dmip) != NULL; dmip = &dmi->next) { /* @@ -139,13 +139,13 @@ int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl) */ __dev_mc_upload(dev); - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); return 0; } } err = -ENOENT; done: - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); return err; } @@ -160,7 +160,7 @@ int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl) dmi1 = kmalloc(sizeof(*dmi), GFP_ATOMIC); - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); for (dmi = dev->mc_list; dmi != NULL; dmi = dmi->next) { if (memcmp(dmi->dmi_addr, addr, dmi->dmi_addrlen) == 0 && dmi->dmi_addrlen == alen) { @@ -176,7 +176,7 @@ int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl) } if ((dmi = dmi1) == NULL) { - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); return -ENOMEM; } memcpy(dmi->dmi_addr, addr, alen); @@ -189,11 +189,11 @@ int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl) __dev_mc_upload(dev); - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); return 0; done: - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); kfree(dmi1); return err; } @@ -204,7 +204,7 @@ done: void dev_mc_discard(struct net_device *dev) { - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); while (dev->mc_list != NULL) { struct dev_mc_list *tmp = dev->mc_list; @@ -215,7 +215,7 @@ void dev_mc_discard(struct net_device *dev) } dev->mc_count = 0; - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); } #ifdef CONFIG_PROC_FS @@ -250,7 +250,7 @@ static int dev_mc_seq_show(struct seq_file *seq, void *v) struct dev_mc_list *m; struct net_device *dev = v; - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); for (m = dev->mc_list; m; m = m->next) { int i; @@ -262,7 +262,7 @@ static int dev_mc_seq_show(struct seq_file *seq, void *v) seq_putc(seq, '\n'); } - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); return 0; } diff --git a/net/core/netpoll.c b/net/core/netpoll.c index e8e05cebd9..9cb7818303 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -273,24 +273,21 @@ static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) do { npinfo->tries--; - spin_lock(&np->dev->xmit_lock); - np->dev->xmit_lock_owner = smp_processor_id(); + netif_tx_lock(np->dev); /* * network drivers do not expect to be called if the queue is * stopped. */ if (netif_queue_stopped(np->dev)) { - np->dev->xmit_lock_owner = -1; - spin_unlock(&np->dev->xmit_lock); + netif_tx_unlock(np->dev); netpoll_poll(np); udelay(50); continue; } status = np->dev->hard_start_xmit(skb, np->dev); - np->dev->xmit_lock_owner = -1; - spin_unlock(&np->dev->xmit_lock); + netif_tx_unlock(np->dev); /* success */ if(!status) { diff --git a/net/core/pktgen.c b/net/core/pktgen.c index c23e9c06ee..67ed14ddab 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -2897,7 +2897,7 @@ static __inline__ void pktgen_xmit(struct pktgen_dev *pkt_dev) } } - spin_lock_bh(&odev->xmit_lock); + netif_tx_lock_bh(odev); if (!netif_queue_stopped(odev)) { atomic_inc(&(pkt_dev->skb->users)); @@ -2942,7 +2942,7 @@ static __inline__ void pktgen_xmit(struct pktgen_dev *pkt_dev) pkt_dev->next_tx_ns = 0; } - spin_unlock_bh(&odev->xmit_lock); + netif_tx_unlock_bh(odev); /* If pkt_dev->count is zero, then run forever */ if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) { diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 138ea92ed2..b1e4c5e20a 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -72,9 +72,9 @@ void qdisc_unlock_tree(struct net_device *dev) dev->queue_lock serializes queue accesses for this device AND dev->qdisc pointer itself. - dev->xmit_lock serializes accesses to device driver. + netif_tx_lock serializes accesses to device driver. - dev->queue_lock and dev->xmit_lock are mutually exclusive, + dev->queue_lock and netif_tx_lock are mutually exclusive, if one is grabbed, another must be free. */ @@ -108,7 +108,7 @@ int qdisc_restart(struct net_device *dev) * will be requeued. */ if (!nolock) { - if (!spin_trylock(&dev->xmit_lock)) { + if (!netif_tx_trylock(dev)) { collision: /* So, someone grabbed the driver. */ @@ -126,8 +126,6 @@ int qdisc_restart(struct net_device *dev) __get_cpu_var(netdev_rx_stat).cpu_collision++; goto requeue; } - /* Remember that the driver is grabbed by us. */ - dev->xmit_lock_owner = smp_processor_id(); } { @@ -142,8 +140,7 @@ int qdisc_restart(struct net_device *dev) ret = dev->hard_start_xmit(skb, dev); if (ret == NETDEV_TX_OK) { if (!nolock) { - dev->xmit_lock_owner = -1; - spin_unlock(&dev->xmit_lock); + netif_tx_unlock(dev); } spin_lock(&dev->queue_lock); return -1; @@ -157,8 +154,7 @@ int qdisc_restart(struct net_device *dev) /* NETDEV_TX_BUSY - we need to requeue */ /* Release the driver */ if (!nolock) { - dev->xmit_lock_owner = -1; - spin_unlock(&dev->xmit_lock); + netif_tx_unlock(dev); } spin_lock(&dev->queue_lock); q = dev->qdisc; @@ -187,7 +183,7 @@ static void dev_watchdog(unsigned long arg) { struct net_device *dev = (struct net_device *)arg; - spin_lock(&dev->xmit_lock); + netif_tx_lock(dev); if (dev->qdisc != &noop_qdisc) { if (netif_device_present(dev) && netif_running(dev) && @@ -203,7 +199,7 @@ static void dev_watchdog(unsigned long arg) dev_hold(dev); } } - spin_unlock(&dev->xmit_lock); + netif_tx_unlock(dev); dev_put(dev); } @@ -227,17 +223,17 @@ void __netdev_watchdog_up(struct net_device *dev) static void dev_watchdog_up(struct net_device *dev) { - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); __netdev_watchdog_up(dev); - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); } static void dev_watchdog_down(struct net_device *dev) { - spin_lock_bh(&dev->xmit_lock); + netif_tx_lock_bh(dev); if (del_timer(&dev->watchdog_timer)) dev_put(dev); - spin_unlock_bh(&dev->xmit_lock); + netif_tx_unlock_bh(dev); } void netif_carrier_on(struct net_device *dev) @@ -582,7 +578,7 @@ void dev_deactivate(struct net_device *dev) while (test_bit(__LINK_STATE_SCHED, &dev->state)) yield(); - spin_unlock_wait(&dev->xmit_lock); + spin_unlock_wait(&dev->_xmit_lock); } void dev_init_scheduler(struct net_device *dev) diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c index 79b8ef34c6..4c16ad57a3 100644 --- a/net/sched/sch_teql.c +++ b/net/sched/sch_teql.c @@ -302,20 +302,17 @@ restart: switch (teql_resolve(skb, skb_res, slave)) { case 0: - if (spin_trylock(&slave->xmit_lock)) { - slave->xmit_lock_owner = smp_processor_id(); + if (netif_tx_trylock(slave)) { if (!netif_queue_stopped(slave) && slave->hard_start_xmit(skb, slave) == 0) { - slave->xmit_lock_owner = -1; - spin_unlock(&slave->xmit_lock); + netif_tx_unlock(slave); master->slaves = NEXT_SLAVE(q); netif_wake_queue(dev); master->stats.tx_packets++; master->stats.tx_bytes += len; return 0; } - slave->xmit_lock_owner = -1; - spin_unlock(&slave->xmit_lock); + netif_tx_unlock(slave); } if (netif_queue_stopped(dev)) busy = 1; -- 2.39.5