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net: Add queue state xoff flag for stack 

Create separate queue state flags so that either the stack or drivers
can turn on XOFF.  Added a set of functions used in the stack to determine
if a queue is really stopped (either by stack or driver)

Signed-off-by: Tom Herbert <therbert@google.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2011-11-28 16:32:44 +00:00 committed by David S. Miller
parent 75957ba36c
commit 7346649826
7 changed files with 46 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
include/linux/netdevice.h
View File

@ -517,11 +517,23 @@ static inline void napi_synchronize(const struct napi_struct *n)
#endif
enum netdev_queue_state_t {
__QUEUE_STATE_XOFF,
__QUEUE_STATE_DRV_XOFF,
__QUEUE_STATE_STACK_XOFF,
__QUEUE_STATE_FROZEN,
#define QUEUE_STATE_XOFF_OR_FROZEN ((1 << __QUEUE_STATE_XOFF) | \
(1 << __QUEUE_STATE_FROZEN))
#define QUEUE_STATE_ANY_XOFF ((1 << __QUEUE_STATE_DRV_XOFF) | \
(1 << __QUEUE_STATE_STACK_XOFF))
#define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \
(1 << __QUEUE_STATE_FROZEN))
};
/*
* __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue. The
* netif_tx_* functions below are used to manipulate this flag. The
* __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
* queue independently. The netif_xmit_*stopped functions below are called
* to check if the queue has been stopped by the driver or stack (either
* of the XOFF bits are set in the state). Drivers should not need to call
* netif_xmit*stopped functions, they should only be using netif_tx_*.
*/
struct netdev_queue {
/*
@ -1718,7 +1730,7 @@ extern void __netif_schedule(struct Qdisc *q);
static inline void netif_schedule_queue(struct netdev_queue *txq)
{
if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
if (!(txq->state & QUEUE_STATE_ANY_XOFF))
__netif_schedule(txq->qdisc);
}
@ -1732,7 +1744,7 @@ static inline void netif_tx_schedule_all(struct net_device *dev)
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
}
/**
@ -1764,7 +1776,7 @@ static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
return;
}
#endif
if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
__netif_schedule(dev_queue->qdisc);
}
@ -1796,7 +1808,7 @@ static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
return;
}
set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
}
/**
@ -1823,7 +1835,7 @@ static inline void netif_tx_stop_all_queues(struct net_device *dev)
static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
{
return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
}
/**
@ -1837,9 +1849,16 @@ static inline int netif_queue_stopped(const struct net_device *dev)
return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
}
static inline int netif_tx_queue_frozen_or_stopped(const struct netdev_queue *dev_queue)
static inline int netif_xmit_stopped(const struct netdev_queue *dev_queue)
{
return dev_queue->state & QUEUE_STATE_XOFF_OR_FROZEN;
return dev_queue->state & QUEUE_STATE_ANY_XOFF;
}
static inline int netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
{
return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
}
}
/**
@ -1926,7 +1945,7 @@ static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
if (netpoll_trap())
return;
#endif
if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
__netif_schedule(txq->qdisc);
}

4
net/core/dev.c
View File

@ -2270,7 +2270,7 @@ gso:
return rc;
}
txq_trans_update(txq);
if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
if (unlikely(netif_xmit_stopped(txq) && skb->next))
return NETDEV_TX_BUSY;
} while (skb->next);
@ -2558,7 +2558,7 @@ int dev_queue_xmit(struct sk_buff *skb)
HARD_TX_LOCK(dev, txq, cpu);
if (!netif_tx_queue_stopped(txq)) {
if (!netif_xmit_stopped(txq)) {
__this_cpu_inc(xmit_recursion);
rc = dev_hard_start_xmit(skb, dev, txq);
__this_cpu_dec(xmit_recursion);

4
net/core/netpoll.c
View File

@ -76,7 +76,7 @@ static void queue_process(struct work_struct *work)
local_irq_save(flags);
__netif_tx_lock(txq, smp_processor_id());
if (netif_tx_queue_frozen_or_stopped(txq) ||
if (netif_xmit_frozen_or_stopped(txq) ||
ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) {
skb_queue_head(&npinfo->txq, skb);
__netif_tx_unlock(txq);
@ -317,7 +317,7 @@ void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
tries > 0; --tries) {
if (__netif_tx_trylock(txq)) {
if (!netif_tx_queue_stopped(txq)) {
if (!netif_xmit_stopped(txq)) {
status = ops->ndo_start_xmit(skb, dev);
if (status == NETDEV_TX_OK)
txq_trans_update(txq);

2
net/core/pktgen.c
View File

@ -3342,7 +3342,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
__netif_tx_lock_bh(txq);
if (unlikely(netif_tx_queue_frozen_or_stopped(txq))) {
if (unlikely(netif_xmit_frozen_or_stopped(txq))) {
ret = NETDEV_TX_BUSY;
pkt_dev->last_ok = 0;
goto unlock;

8
net/sched/sch_generic.c
View File

@ -60,7 +60,7 @@ static inline struct sk_buff *dequeue_skb(struct Qdisc *q)
/* check the reason of requeuing without tx lock first */
txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
if (!netif_tx_queue_frozen_or_stopped(txq)) {
if (!netif_xmit_frozen_or_stopped(txq)) {
q->gso_skb = NULL;
q->q.qlen--;
} else
@ -121,7 +121,7 @@ int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
spin_unlock(root_lock);
HARD_TX_LOCK(dev, txq, smp_processor_id());
if (!netif_tx_queue_frozen_or_stopped(txq))
if (!netif_xmit_frozen_or_stopped(txq))
ret = dev_hard_start_xmit(skb, dev, txq);
HARD_TX_UNLOCK(dev, txq);
@ -143,7 +143,7 @@ int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
ret = dev_requeue_skb(skb, q);
}
if (ret && netif_tx_queue_frozen_or_stopped(txq))
if (ret && netif_xmit_frozen_or_stopped(txq))
ret = 0;
return ret;
@ -242,7 +242,7 @@ static void dev_watchdog(unsigned long arg)
* old device drivers set dev->trans_start
*/
trans_start = txq->trans_start ? : dev->trans_start;
if (netif_tx_queue_stopped(txq) &&
if (netif_xmit_stopped(txq) &&
time_after(jiffies, (trans_start +
dev->watchdog_timeo))) {
some_queue_timedout = 1;

6
net/sched/sch_multiq.c
View File

@ -107,7 +107,8 @@ static struct sk_buff *multiq_dequeue(struct Qdisc *sch)
/* Check that target subqueue is available before
* pulling an skb to avoid head-of-line blocking.
*/
if (!__netif_subqueue_stopped(qdisc_dev(sch), q->curband)) {
if (!netif_xmit_stopped(
netdev_get_tx_queue(qdisc_dev(sch), q->curband))) {
qdisc = q->queues[q->curband];
skb = qdisc->dequeue(qdisc);
if (skb) {
@ -138,7 +139,8 @@ static struct sk_buff *multiq_peek(struct Qdisc *sch)
/* Check that target subqueue is available before
* pulling an skb to avoid head-of-line blocking.
*/
if (!__netif_subqueue_stopped(qdisc_dev(sch), curband)) {
if (!netif_xmit_stopped(
netdev_get_tx_queue(qdisc_dev(sch), curband))) {
qdisc = q->queues[curband];
skb = qdisc->ops->peek(qdisc);
if (skb)

6
net/sched/sch_teql.c
View File

@ -301,7 +301,7 @@ restart:
if (slave_txq->qdisc_sleeping != q)
continue;
if (__netif_subqueue_stopped(slave, subq) ||
if (netif_xmit_stopped(netdev_get_tx_queue(slave, subq)) ||
!netif_running(slave)) {
busy = 1;
continue;
@ -312,7 +312,7 @@ restart:
if (__netif_tx_trylock(slave_txq)) {
unsigned int length = qdisc_pkt_len(skb);
if (!netif_tx_queue_frozen_or_stopped(slave_txq) &&
if (!netif_xmit_frozen_or_stopped(slave_txq) &&
slave_ops->ndo_start_xmit(skb, slave) == NETDEV_TX_OK) {
txq_trans_update(slave_txq);
__netif_tx_unlock(slave_txq);
@ -324,7 +324,7 @@ restart:
}
__netif_tx_unlock(slave_txq);
}
if (netif_queue_stopped(dev))
if (netif_xmit_stopped(netdev_get_tx_queue(dev, 0)))
busy = 1;
break;
case 1: