* - Ingress support
*/
-#include <asm/uaccess.h>
-#include <asm/system.h>
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/socket.h>
-#include <linux/sockios.h>
-#include <linux/in.h>
#include <linux/errno.h>
-#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/init.h>
#include <linux/rcupdate.h>
#include <linux/list.h>
-#include <net/sock.h>
+#include <linux/slab.h>
#include <net/pkt_sched.h>
+#include <net/dst.h>
/* Main transmission queue. */
/* Modifications to data participating in scheduling must be protected with
- * dev->queue_lock spinlock.
+ * qdisc_lock(qdisc) spinlock.
*
* The idea is the following:
- * - enqueue, dequeue are serialized via top level device
- * spinlock dev->queue_lock.
- * - ingress filtering is serialized via top level device
- * spinlock dev->ingress_lock.
+ * - enqueue, dequeue are serialized via qdisc root lock
+ * - ingress filtering is also serialized via qdisc root lock
* - updates to tree and tree walking are only done under the rtnl mutex.
*/
-void qdisc_lock_tree(struct net_device *dev)
+static inline int dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q)
{
- spin_lock_bh(&dev->queue_lock);
- spin_lock(&dev->ingress_lock);
+ skb_dst_force(skb);
+ q->gso_skb = skb;
+ q->qstats.requeues++;
+ q->q.qlen++; /* it's still part of the queue */
+ __netif_schedule(q);
+
+ return 0;
}
-void qdisc_unlock_tree(struct net_device *dev)
+static inline struct sk_buff *dequeue_skb(struct Qdisc *q)
{
- spin_unlock(&dev->ingress_lock);
- spin_unlock_bh(&dev->queue_lock);
+ struct sk_buff *skb = q->gso_skb;
+
+ if (unlikely(skb)) {
+ struct net_device *dev = qdisc_dev(q);
+ struct netdev_queue *txq;
+
+ /* check the reason of requeuing without tx lock first */
+ txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
+ if (!netif_tx_queue_stopped(txq) &&
+ !netif_tx_queue_frozen(txq)) {
+ q->gso_skb = NULL;
+ q->q.qlen--;
+ } else
+ skb = NULL;
+ } else {
+ skb = q->dequeue(q);
+ }
+
+ return skb;
}
-/*
- dev->queue_lock serializes queue accesses for this device
- AND dev->qdisc pointer itself.
+static inline int handle_dev_cpu_collision(struct sk_buff *skb,
+ struct netdev_queue *dev_queue,
+ struct Qdisc *q)
+{
+ int ret;
+
+ if (unlikely(dev_queue->xmit_lock_owner == smp_processor_id())) {
+ /*
+ * Same CPU holding the lock. It may be a transient
+ * configuration error, when hard_start_xmit() recurses. We
+ * detect it by checking xmit owner and drop the packet when
+ * deadloop is detected. Return OK to try the next skb.
+ */
+ kfree_skb(skb);
+ if (net_ratelimit())
+ printk(KERN_WARNING "Dead loop on netdevice %s, "
+ "fix it urgently!\n", dev_queue->dev->name);
+ ret = qdisc_qlen(q);
+ } else {
+ /*
+ * Another cpu is holding lock, requeue & delay xmits for
+ * some time.
+ */
+ __get_cpu_var(softnet_data).cpu_collision++;
+ ret = dev_requeue_skb(skb, q);
+ }
- netif_tx_lock serializes accesses to device driver.
+ return ret;
+}
- dev->queue_lock and netif_tx_lock are mutually exclusive,
- if one is grabbed, another must be free.
+/*
+ * Transmit one skb, and handle the return status as required. Holding the
+ * __QDISC_STATE_RUNNING bit guarantees that only one CPU can execute this
+ * function.
+ *
+ * Returns to the caller:
+ * 0 - queue is empty or throttled.
+ * >0 - queue is not empty.
*/
+int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
+ struct net_device *dev, struct netdev_queue *txq,
+ spinlock_t *root_lock)
+{
+ int ret = NETDEV_TX_BUSY;
+
+ /* And release qdisc */
+ spin_unlock(root_lock);
+ HARD_TX_LOCK(dev, txq, smp_processor_id());
+ if (!netif_tx_queue_stopped(txq) && !netif_tx_queue_frozen(txq))
+ ret = dev_hard_start_xmit(skb, dev, txq);
-/* Kick device.
- Note, that this procedure can be called by a watchdog timer, so that
- we do not check dev->tbusy flag here.
+ HARD_TX_UNLOCK(dev, txq);
- Returns: 0 - queue is empty.
- >0 - queue is not empty, but throttled.
- <0 - queue is not empty. Device is throttled, if dev->tbusy != 0.
+ spin_lock(root_lock);
- NOTE: Called under dev->queue_lock with locally disabled BH.
-*/
+ if (dev_xmit_complete(ret)) {
+ /* Driver sent out skb successfully or skb was consumed */
+ ret = qdisc_qlen(q);
+ } else if (ret == NETDEV_TX_LOCKED) {
+ /* Driver try lock failed */
+ ret = handle_dev_cpu_collision(skb, txq, q);
+ } else {
+ /* Driver returned NETDEV_TX_BUSY - requeue skb */
+ if (unlikely (ret != NETDEV_TX_BUSY && net_ratelimit()))
+ printk(KERN_WARNING "BUG %s code %d qlen %d\n",
+ dev->name, ret, q->q.qlen);
+
+ ret = dev_requeue_skb(skb, q);
+ }
+
+ if (ret && (netif_tx_queue_stopped(txq) ||
+ netif_tx_queue_frozen(txq)))
+ ret = 0;
+
+ return ret;
+}
-static inline int qdisc_restart(struct net_device *dev)
+/*
+ * NOTE: Called under qdisc_lock(q) with locally disabled BH.
+ *
+ * __QDISC_STATE_RUNNING guarantees only one CPU can process
+ * this qdisc at a time. qdisc_lock(q) serializes queue accesses for
+ * this queue.
+ *
+ * netif_tx_lock serializes accesses to device driver.
+ *
+ * qdisc_lock(q) and netif_tx_lock are mutually exclusive,
+ * if one is grabbed, another must be free.
+ *
+ * Note, that this procedure can be called by a watchdog timer
+ *
+ * Returns to the caller:
+ * 0 - queue is empty or throttled.
+ * >0 - queue is not empty.
+ *
+ */
+static inline int qdisc_restart(struct Qdisc *q)
{
- struct Qdisc *q = dev->qdisc;
+ struct netdev_queue *txq;
+ struct net_device *dev;
+ spinlock_t *root_lock;
struct sk_buff *skb;
/* Dequeue packet */
- if (((skb = dev->gso_skb)) || ((skb = q->dequeue(q)))) {
- unsigned nolock = (dev->features & NETIF_F_LLTX);
+ skb = dequeue_skb(q);
+ if (unlikely(!skb))
+ return 0;
+ WARN_ON_ONCE(skb_dst_is_noref(skb));
+ root_lock = qdisc_lock(q);
+ dev = qdisc_dev(q);
+ txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
+
+ return sch_direct_xmit(skb, q, dev, txq, root_lock);
+}
- dev->gso_skb = NULL;
+void __qdisc_run(struct Qdisc *q)
+{
+ unsigned long start_time = jiffies;
+ while (qdisc_restart(q)) {
/*
- * When the driver has LLTX set it does its own locking
- * in start_xmit. No need to add additional overhead by
- * locking again. These checks are worth it because
- * even uncongested locks can be quite expensive.
- * The driver can do trylock like here too, in case
- * of lock congestion it should return -1 and the packet
- * will be requeued.
+ * Postpone processing if
+ * 1. another process needs the CPU;
+ * 2. we've been doing it for too long.
*/
- if (!nolock) {
- if (!netif_tx_trylock(dev)) {
- collision:
- /* So, someone grabbed the driver. */
-
- /* It may be transient configuration error,
- when hard_start_xmit() recurses. We detect
- it by checking xmit owner and drop the
- packet when deadloop is detected.
- */
- if (dev->xmit_lock_owner == smp_processor_id()) {
- kfree_skb(skb);
- if (net_ratelimit())
- printk(KERN_DEBUG "Dead loop on netdevice %s, fix it urgently!\n", dev->name);
- return -1;
- }
- __get_cpu_var(netdev_rx_stat).cpu_collision++;
- goto requeue;
- }
+ if (need_resched() || jiffies != start_time) {
+ __netif_schedule(q);
+ break;
}
-
- {
- /* And release queue */
- spin_unlock(&dev->queue_lock);
-
- if (!netif_queue_stopped(dev)) {
- int ret;
-
- ret = dev_hard_start_xmit(skb, dev);
- if (ret == NETDEV_TX_OK) {
- if (!nolock) {
- netif_tx_unlock(dev);
- }
- spin_lock(&dev->queue_lock);
- return -1;
- }
- if (ret == NETDEV_TX_LOCKED && nolock) {
- spin_lock(&dev->queue_lock);
- goto collision;
- }
- }
-
- /* NETDEV_TX_BUSY - we need to requeue */
- /* Release the driver */
- if (!nolock) {
- netif_tx_unlock(dev);
- }
- spin_lock(&dev->queue_lock);
- q = dev->qdisc;
- }
-
- /* Device kicked us out :(
- This is possible in three cases:
-
- 0. driver is locked
- 1. fastroute is enabled
- 2. device cannot determine busy state
- before start of transmission (f.e. dialout)
- 3. device is buggy (ppp)
- */
-
-requeue:
- if (skb->next)
- dev->gso_skb = skb;
- else
- q->ops->requeue(skb, q);
- netif_schedule(dev);
- return 1;
}
- BUG_ON((int) q->q.qlen < 0);
- return q->q.qlen;
+
+ clear_bit(__QDISC_STATE_RUNNING, &q->state);
}
-void __qdisc_run(struct net_device *dev)
+unsigned long dev_trans_start(struct net_device *dev)
{
- if (unlikely(dev->qdisc == &noop_qdisc))
- goto out;
-
- while (qdisc_restart(dev) < 0 && !netif_queue_stopped(dev))
- /* NOTHING */;
+ unsigned long val, res = dev->trans_start;
+ unsigned int i;
-out:
- clear_bit(__LINK_STATE_QDISC_RUNNING, &dev->state);
+ for (i = 0; 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;
}
+EXPORT_SYMBOL(dev_trans_start);
static void dev_watchdog(unsigned long arg)
{
struct net_device *dev = (struct net_device *)arg;
netif_tx_lock(dev);
- if (dev->qdisc != &noop_qdisc) {
+ if (!qdisc_tx_is_noop(dev)) {
if (netif_device_present(dev) &&
netif_running(dev) &&
netif_carrier_ok(dev)) {
- if (netif_queue_stopped(dev) &&
- time_after(jiffies, dev->trans_start + dev->watchdog_timeo)) {
+ int some_queue_timedout = 0;
+ unsigned int i;
+ unsigned long trans_start;
+
+ for (i = 0; i < dev->num_tx_queues; i++) {
+ 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;
+ if (netif_tx_queue_stopped(txq) &&
+ time_after(jiffies, (trans_start +
+ dev->watchdog_timeo))) {
+ some_queue_timedout = 1;
+ break;
+ }
+ }
- printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n",
- dev->name);
- dev->tx_timeout(dev);
+ if (some_queue_timedout) {
+ char drivername[64];
+ WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n",
+ dev->name, netdev_drivername(dev, drivername, 64), i);
+ dev->netdev_ops->ndo_tx_timeout(dev);
}
- if (!mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + dev->watchdog_timeo)))
+ if (!mod_timer(&dev->watchdog_timer,
+ round_jiffies(jiffies +
+ dev->watchdog_timeo)))
dev_hold(dev);
}
}
dev_put(dev);
}
-static void dev_watchdog_init(struct net_device *dev)
-{
- init_timer(&dev->watchdog_timer);
- dev->watchdog_timer.data = (unsigned long)dev;
- dev->watchdog_timer.function = dev_watchdog;
-}
-
void __netdev_watchdog_up(struct net_device *dev)
{
- if (dev->tx_timeout) {
+ if (dev->netdev_ops->ndo_tx_timeout) {
if (dev->watchdog_timeo <= 0)
dev->watchdog_timeo = 5*HZ;
- if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo))
+ if (!mod_timer(&dev->watchdog_timer,
+ round_jiffies(jiffies + dev->watchdog_timeo)))
dev_hold(dev);
}
}
netif_tx_unlock_bh(dev);
}
+/**
+ * netif_carrier_on - set carrier
+ * @dev: network device
+ *
+ * Device has detected that carrier.
+ */
void netif_carrier_on(struct net_device *dev)
{
- if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state))
+ if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) {
+ if (dev->reg_state == NETREG_UNINITIALIZED)
+ return;
linkwatch_fire_event(dev);
- if (netif_running(dev))
- __netdev_watchdog_up(dev);
+ if (netif_running(dev))
+ __netdev_watchdog_up(dev);
+ }
}
+EXPORT_SYMBOL(netif_carrier_on);
+/**
+ * netif_carrier_off - clear carrier
+ * @dev: network device
+ *
+ * Device has detected loss of carrier.
+ */
void netif_carrier_off(struct net_device *dev)
{
- if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state))
+ if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) {
+ if (dev->reg_state == NETREG_UNINITIALIZED)
+ return;
linkwatch_fire_event(dev);
+ }
}
+EXPORT_SYMBOL(netif_carrier_off);
/* "NOOP" scheduler: the best scheduler, recommended for all interfaces
under all circumstances. It is difficult to invent anything faster or
return NULL;
}
-static int noop_requeue(struct sk_buff *skb, struct Qdisc* qdisc)
-{
- if (net_ratelimit())
- printk(KERN_DEBUG "%s deferred output. It is buggy.\n",
- skb->dev->name);
- kfree_skb(skb);
- return NET_XMIT_CN;
-}
-
-struct Qdisc_ops noop_qdisc_ops = {
+struct Qdisc_ops noop_qdisc_ops __read_mostly = {
.id = "noop",
.priv_size = 0,
.enqueue = noop_enqueue,
.dequeue = noop_dequeue,
- .requeue = noop_requeue,
+ .peek = noop_dequeue,
.owner = THIS_MODULE,
};
+static struct netdev_queue noop_netdev_queue = {
+ .qdisc = &noop_qdisc,
+ .qdisc_sleeping = &noop_qdisc,
+};
+
struct Qdisc noop_qdisc = {
.enqueue = noop_enqueue,
.dequeue = noop_dequeue,
.flags = TCQ_F_BUILTIN,
.ops = &noop_qdisc_ops,
.list = LIST_HEAD_INIT(noop_qdisc.list),
+ .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock),
+ .dev_queue = &noop_netdev_queue,
};
+EXPORT_SYMBOL(noop_qdisc);
-static struct Qdisc_ops noqueue_qdisc_ops = {
+static struct Qdisc_ops noqueue_qdisc_ops __read_mostly = {
.id = "noqueue",
.priv_size = 0,
.enqueue = noop_enqueue,
.dequeue = noop_dequeue,
- .requeue = noop_requeue,
+ .peek = noop_dequeue,
.owner = THIS_MODULE,
};
+static struct Qdisc noqueue_qdisc;
+static struct netdev_queue noqueue_netdev_queue = {
+ .qdisc = &noqueue_qdisc,
+ .qdisc_sleeping = &noqueue_qdisc,
+};
+
static struct Qdisc noqueue_qdisc = {
.enqueue = NULL,
.dequeue = noop_dequeue,
.flags = TCQ_F_BUILTIN,
.ops = &noqueue_qdisc_ops,
.list = LIST_HEAD_INIT(noqueue_qdisc.list),
+ .q.lock = __SPIN_LOCK_UNLOCKED(noqueue_qdisc.q.lock),
+ .dev_queue = &noqueue_netdev_queue,
};
#define PFIFO_FAST_BANDS 3
-static inline struct sk_buff_head *prio2list(struct sk_buff *skb,
- struct Qdisc *qdisc)
+/*
+ * Private data for a pfifo_fast scheduler containing:
+ * - queues for the three band
+ * - bitmap indicating which of the bands contain skbs
+ */
+struct pfifo_fast_priv {
+ u32 bitmap;
+ struct sk_buff_head q[PFIFO_FAST_BANDS];
+};
+
+/*
+ * Convert a bitmap to the first band number where an skb is queued, where:
+ * bitmap=0 means there are no skbs on any band.
+ * bitmap=1 means there is an skb on band 0.
+ * bitmap=7 means there are skbs on all 3 bands, etc.
+ */
+static const int bitmap2band[] = {-1, 0, 1, 0, 2, 0, 1, 0};
+
+static inline struct sk_buff_head *band2list(struct pfifo_fast_priv *priv,
+ int band)
{
- struct sk_buff_head *list = qdisc_priv(qdisc);
- return list + prio2band[skb->priority & TC_PRIO_MAX];
+ return priv->q + band;
}
static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc)
{
- struct sk_buff_head *list = prio2list(skb, qdisc);
+ if (skb_queue_len(&qdisc->q) < qdisc_dev(qdisc)->tx_queue_len) {
+ int band = prio2band[skb->priority & TC_PRIO_MAX];
+ struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
+ struct sk_buff_head *list = band2list(priv, band);
- if (skb_queue_len(list) < qdisc->dev->tx_queue_len) {
+ priv->bitmap |= (1 << band);
qdisc->q.qlen++;
return __qdisc_enqueue_tail(skb, qdisc, list);
}
static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc)
{
- int prio;
- struct sk_buff_head *list = qdisc_priv(qdisc);
+ struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
+ int band = bitmap2band[priv->bitmap];
- for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
- if (!skb_queue_empty(list + prio)) {
- qdisc->q.qlen--;
- return __qdisc_dequeue_head(qdisc, list + prio);
- }
+ if (likely(band >= 0)) {
+ struct sk_buff_head *list = band2list(priv, band);
+ struct sk_buff *skb = __qdisc_dequeue_head(qdisc, list);
+
+ qdisc->q.qlen--;
+ if (skb_queue_empty(list))
+ priv->bitmap &= ~(1 << band);
+
+ return skb;
}
return NULL;
}
-static int pfifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc)
+static struct sk_buff *pfifo_fast_peek(struct Qdisc* qdisc)
{
- qdisc->q.qlen++;
- return __qdisc_requeue(skb, qdisc, prio2list(skb, qdisc));
+ struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
+ int band = bitmap2band[priv->bitmap];
+
+ if (band >= 0) {
+ struct sk_buff_head *list = band2list(priv, band);
+
+ return skb_peek(list);
+ }
+
+ return NULL;
}
static void pfifo_fast_reset(struct Qdisc* qdisc)
{
int prio;
- struct sk_buff_head *list = qdisc_priv(qdisc);
+ struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
- __qdisc_reset_queue(qdisc, list + prio);
+ __qdisc_reset_queue(qdisc, band2list(priv, prio));
+ priv->bitmap = 0;
qdisc->qstats.backlog = 0;
qdisc->q.qlen = 0;
}
struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS };
memcpy(&opt.priomap, prio2band, TC_PRIO_MAX+1);
- RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
+ NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
return skb->len;
-rtattr_failure:
+nla_put_failure:
return -1;
}
-static int pfifo_fast_init(struct Qdisc *qdisc, struct rtattr *opt)
+static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt)
{
int prio;
- struct sk_buff_head *list = qdisc_priv(qdisc);
+ struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
- skb_queue_head_init(list + prio);
+ skb_queue_head_init(band2list(priv, prio));
return 0;
}
-static struct Qdisc_ops pfifo_fast_ops = {
+struct Qdisc_ops pfifo_fast_ops __read_mostly = {
.id = "pfifo_fast",
- .priv_size = PFIFO_FAST_BANDS * sizeof(struct sk_buff_head),
+ .priv_size = sizeof(struct pfifo_fast_priv),
.enqueue = pfifo_fast_enqueue,
.dequeue = pfifo_fast_dequeue,
- .requeue = pfifo_fast_requeue,
+ .peek = pfifo_fast_peek,
.init = pfifo_fast_init,
.reset = pfifo_fast_reset,
.dump = pfifo_fast_dump,
.owner = THIS_MODULE,
};
-struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops)
+struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
+ struct Qdisc_ops *ops)
{
void *p;
struct Qdisc *sch;
unsigned int size;
int err = -ENOBUFS;
- /* ensure that the Qdisc and the private data are 32-byte aligned */
+ /* ensure that the Qdisc and the private data are 64-byte aligned */
size = QDISC_ALIGN(sizeof(*sch));
size += ops->priv_size + (QDISC_ALIGNTO - 1);
sch->ops = ops;
sch->enqueue = ops->enqueue;
sch->dequeue = ops->dequeue;
- sch->dev = dev;
- dev_hold(dev);
+ sch->dev_queue = dev_queue;
+ dev_hold(qdisc_dev(sch));
atomic_set(&sch->refcnt, 1);
return sch;
errout:
- return ERR_PTR(-err);
+ return ERR_PTR(err);
}
-struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops,
+struct Qdisc * qdisc_create_dflt(struct net_device *dev,
+ struct netdev_queue *dev_queue,
+ struct Qdisc_ops *ops,
unsigned int parentid)
{
struct Qdisc *sch;
- sch = qdisc_alloc(dev, ops);
+ sch = qdisc_alloc(dev_queue, ops);
if (IS_ERR(sch))
goto errout;
- sch->stats_lock = &dev->queue_lock;
sch->parent = parentid;
if (!ops->init || ops->init(sch, NULL) == 0)
errout:
return NULL;
}
+EXPORT_SYMBOL(qdisc_create_dflt);
-/* Under dev->queue_lock and BH! */
+/* Under qdisc_lock(qdisc) and BH! */
void qdisc_reset(struct Qdisc *qdisc)
{
- struct Qdisc_ops *ops = qdisc->ops;
+ const struct Qdisc_ops *ops = qdisc->ops;
if (ops->reset)
ops->reset(qdisc);
-}
-/* this is the rcu callback function to clean up a qdisc when there
- * are no further references to it */
+ if (qdisc->gso_skb) {
+ kfree_skb(qdisc->gso_skb);
+ qdisc->gso_skb = NULL;
+ qdisc->q.qlen = 0;
+ }
+}
+EXPORT_SYMBOL(qdisc_reset);
-static void __qdisc_destroy(struct rcu_head *head)
+static void qdisc_rcu_free(struct rcu_head *head)
{
- struct Qdisc *qdisc = container_of(head, struct Qdisc, q_rcu);
+ struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head);
+
kfree((char *) qdisc - qdisc->padded);
}
-/* Under dev->queue_lock and BH! */
-
void qdisc_destroy(struct Qdisc *qdisc)
{
- struct Qdisc_ops *ops = qdisc->ops;
+ const struct Qdisc_ops *ops = qdisc->ops;
if (qdisc->flags & TCQ_F_BUILTIN ||
!atomic_dec_and_test(&qdisc->refcnt))
return;
- list_del(&qdisc->list);
-#ifdef CONFIG_NET_ESTIMATOR
- gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est);
+#ifdef CONFIG_NET_SCHED
+ qdisc_list_del(qdisc);
+
+ qdisc_put_stab(qdisc->stab);
#endif
+ gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est);
if (ops->reset)
ops->reset(qdisc);
if (ops->destroy)
ops->destroy(qdisc);
module_put(ops->owner);
- dev_put(qdisc->dev);
- call_rcu(&qdisc->q_rcu, __qdisc_destroy);
+ dev_put(qdisc_dev(qdisc));
+
+ kfree_skb(qdisc->gso_skb);
+ /*
+ * gen_estimator est_timer() might access qdisc->q.lock,
+ * wait a RCU grace period before freeing qdisc.
+ */
+ call_rcu(&qdisc->rcu_head, qdisc_rcu_free);
+}
+EXPORT_SYMBOL(qdisc_destroy);
+
+/* Attach toplevel qdisc to device queue. */
+struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
+ struct Qdisc *qdisc)
+{
+ struct Qdisc *oqdisc = dev_queue->qdisc_sleeping;
+ spinlock_t *root_lock;
+
+ root_lock = qdisc_lock(oqdisc);
+ spin_lock_bh(root_lock);
+
+ /* Prune old scheduler */
+ if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1)
+ qdisc_reset(oqdisc);
+
+ /* ... and graft new one */
+ if (qdisc == NULL)
+ qdisc = &noop_qdisc;
+ dev_queue->qdisc_sleeping = qdisc;
+ rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);
+
+ spin_unlock_bh(root_lock);
+
+ return oqdisc;
+}
+
+static void attach_one_default_qdisc(struct net_device *dev,
+ struct netdev_queue *dev_queue,
+ void *_unused)
+{
+ struct Qdisc *qdisc;
+
+ if (dev->tx_queue_len) {
+ qdisc = qdisc_create_dflt(dev, dev_queue,
+ &pfifo_fast_ops, TC_H_ROOT);
+ if (!qdisc) {
+ printk(KERN_INFO "%s: activation failed\n", dev->name);
+ return;
+ }
+
+ /* Can by-pass the queue discipline for default qdisc */
+ qdisc->flags |= TCQ_F_CAN_BYPASS;
+ } else {
+ qdisc = &noqueue_qdisc;
+ }
+ dev_queue->qdisc_sleeping = qdisc;
+}
+
+static void attach_default_qdiscs(struct net_device *dev)
+{
+ struct netdev_queue *txq;
+ struct Qdisc *qdisc;
+
+ txq = netdev_get_tx_queue(dev, 0);
+
+ if (!netif_is_multiqueue(dev) || dev->tx_queue_len == 0) {
+ netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL);
+ dev->qdisc = txq->qdisc_sleeping;
+ atomic_inc(&dev->qdisc->refcnt);
+ } else {
+ qdisc = qdisc_create_dflt(dev, txq, &mq_qdisc_ops, TC_H_ROOT);
+ if (qdisc) {
+ qdisc->ops->attach(qdisc);
+ dev->qdisc = qdisc;
+ }
+ }
+}
+
+static void transition_one_qdisc(struct net_device *dev,
+ struct netdev_queue *dev_queue,
+ void *_need_watchdog)
+{
+ struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping;
+ int *need_watchdog_p = _need_watchdog;
+
+ if (!(new_qdisc->flags & TCQ_F_BUILTIN))
+ clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state);
+
+ rcu_assign_pointer(dev_queue->qdisc, new_qdisc);
+ if (need_watchdog_p && new_qdisc != &noqueue_qdisc) {
+ dev_queue->trans_start = 0;
+ *need_watchdog_p = 1;
+ }
}
void dev_activate(struct net_device *dev)
{
+ int need_watchdog;
+
/* No queueing discipline is attached to device;
create default one i.e. pfifo_fast for devices,
which need queueing and noqueue_qdisc for
virtual interfaces
*/
- if (dev->qdisc_sleeping == &noop_qdisc) {
- struct Qdisc *qdisc;
- if (dev->tx_queue_len) {
- qdisc = qdisc_create_dflt(dev, &pfifo_fast_ops,
- TC_H_ROOT);
- if (qdisc == NULL) {
- printk(KERN_INFO "%s: activation failed\n", dev->name);
- return;
- }
- list_add_tail(&qdisc->list, &dev->qdisc_list);
- } else {
- qdisc = &noqueue_qdisc;
- }
- dev->qdisc_sleeping = qdisc;
- }
+ if (dev->qdisc == &noop_qdisc)
+ attach_default_qdiscs(dev);
if (!netif_carrier_ok(dev))
/* Delay activation until next carrier-on event */
return;
- spin_lock_bh(&dev->queue_lock);
- rcu_assign_pointer(dev->qdisc, dev->qdisc_sleeping);
- if (dev->qdisc != &noqueue_qdisc) {
+ need_watchdog = 0;
+ netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog);
+ transition_one_qdisc(dev, &dev->rx_queue, NULL);
+
+ if (need_watchdog) {
dev->trans_start = jiffies;
dev_watchdog_up(dev);
}
- spin_unlock_bh(&dev->queue_lock);
}
-void dev_deactivate(struct net_device *dev)
+static void dev_deactivate_queue(struct net_device *dev,
+ struct netdev_queue *dev_queue,
+ void *_qdisc_default)
{
+ struct Qdisc *qdisc_default = _qdisc_default;
struct Qdisc *qdisc;
- spin_lock_bh(&dev->queue_lock);
- qdisc = dev->qdisc;
- dev->qdisc = &noop_qdisc;
+ qdisc = dev_queue->qdisc;
+ if (qdisc) {
+ spin_lock_bh(qdisc_lock(qdisc));
+
+ if (!(qdisc->flags & TCQ_F_BUILTIN))
+ set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state);
+
+ rcu_assign_pointer(dev_queue->qdisc, qdisc_default);
+ qdisc_reset(qdisc);
+
+ spin_unlock_bh(qdisc_lock(qdisc));
+ }
+}
+
+static bool some_qdisc_is_busy(struct net_device *dev)
+{
+ unsigned int i;
+
+ for (i = 0; i < dev->num_tx_queues; i++) {
+ struct netdev_queue *dev_queue;
+ spinlock_t *root_lock;
+ struct Qdisc *q;
+ int val;
+
+ dev_queue = netdev_get_tx_queue(dev, i);
+ q = dev_queue->qdisc_sleeping;
+ root_lock = qdisc_lock(q);
+
+ spin_lock_bh(root_lock);
- qdisc_reset(qdisc);
+ val = (test_bit(__QDISC_STATE_RUNNING, &q->state) ||
+ test_bit(__QDISC_STATE_SCHED, &q->state));
- spin_unlock_bh(&dev->queue_lock);
+ spin_unlock_bh(root_lock);
+
+ if (val)
+ return true;
+ }
+ return false;
+}
+
+void dev_deactivate(struct net_device *dev)
+{
+ netdev_for_each_tx_queue(dev, dev_deactivate_queue, &noop_qdisc);
+ dev_deactivate_queue(dev, &dev->rx_queue, &noop_qdisc);
dev_watchdog_down(dev);
- /* Wait for outstanding dev_queue_xmit calls. */
+ /* Wait for outstanding qdisc-less dev_queue_xmit calls. */
synchronize_rcu();
/* Wait for outstanding qdisc_run calls. */
- while (test_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
+ while (some_qdisc_is_busy(dev))
yield();
+}
- if (dev->gso_skb) {
- kfree_skb(dev->gso_skb);
- dev->gso_skb = NULL;
- }
+static void dev_init_scheduler_queue(struct net_device *dev,
+ struct netdev_queue *dev_queue,
+ void *_qdisc)
+{
+ struct Qdisc *qdisc = _qdisc;
+
+ dev_queue->qdisc = qdisc;
+ dev_queue->qdisc_sleeping = qdisc;
}
void dev_init_scheduler(struct net_device *dev)
{
- qdisc_lock_tree(dev);
dev->qdisc = &noop_qdisc;
- dev->qdisc_sleeping = &noop_qdisc;
- INIT_LIST_HEAD(&dev->qdisc_list);
- qdisc_unlock_tree(dev);
+ netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc);
+ dev_init_scheduler_queue(dev, &dev->rx_queue, &noop_qdisc);
- dev_watchdog_init(dev);
+ setup_timer(&dev->watchdog_timer, dev_watchdog, (unsigned long)dev);
}
-void dev_shutdown(struct net_device *dev)
+static void shutdown_scheduler_queue(struct net_device *dev,
+ struct netdev_queue *dev_queue,
+ void *_qdisc_default)
{
- struct Qdisc *qdisc;
+ struct Qdisc *qdisc = dev_queue->qdisc_sleeping;
+ struct Qdisc *qdisc_default = _qdisc_default;
+
+ if (qdisc) {
+ rcu_assign_pointer(dev_queue->qdisc, qdisc_default);
+ dev_queue->qdisc_sleeping = qdisc_default;
- qdisc_lock_tree(dev);
- qdisc = dev->qdisc_sleeping;
- dev->qdisc = &noop_qdisc;
- dev->qdisc_sleeping = &noop_qdisc;
- qdisc_destroy(qdisc);
-#if defined(CONFIG_NET_SCH_INGRESS) || defined(CONFIG_NET_SCH_INGRESS_MODULE)
- if ((qdisc = dev->qdisc_ingress) != NULL) {
- dev->qdisc_ingress = NULL;
qdisc_destroy(qdisc);
}
-#endif
- BUG_TRAP(!timer_pending(&dev->watchdog_timer));
- qdisc_unlock_tree(dev);
}
-EXPORT_SYMBOL(netif_carrier_on);
-EXPORT_SYMBOL(netif_carrier_off);
-EXPORT_SYMBOL(noop_qdisc);
-EXPORT_SYMBOL(qdisc_create_dflt);
-EXPORT_SYMBOL(qdisc_destroy);
-EXPORT_SYMBOL(qdisc_reset);
-EXPORT_SYMBOL(qdisc_lock_tree);
-EXPORT_SYMBOL(qdisc_unlock_tree);
+void dev_shutdown(struct net_device *dev)
+{
+ netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc);
+ shutdown_scheduler_queue(dev, &dev->rx_queue, &noop_qdisc);
+ qdisc_destroy(dev->qdisc);
+ dev->qdisc = &noop_qdisc;
+
+ WARN_ON(timer_pending(&dev->watchdog_timer));
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff