[RFC PATCH v2 2/9] net: Add queue state xoff flag for stack
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From: Tom Herbert <hidden>
Date: 2011-08-08 04:44:41
Subsystem:
networking drivers, networking [general], tc subsystem, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Jamal Hadi Salim, Jiri Pirko, Linus Torvalds
From c3a8c0ace2322f9ccf78089936a504af9c9e0c7f Mon Sep 17 00:00:00 2001
From: Tom Herbert <redacted> Date: Thu, 14 Jul 2011 22:08:27 -0700 Subject: [PATCH 2/9] 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 usedin the stack to determine if a queue is really stopped (either by stack of driver) Signed-off-by: Tom Herbert <redacted> --- include/linux/netdevice.h | 32 +++++++++++++++++++++----------- net/core/dev.c | 4 ++-- net/core/netpoll.c | 4 ++-- net/core/pktgen.c | 2 +- net/sched/sch_generic.c | 8 ++++---- net/sched/sch_multiq.c | 6 ++++-- net/sched/sch_teql.c | 6 +++--- 7 files changed, 37 insertions(+), 25 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ddee79b..4115b4d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h@@ -516,10 +516,13 @@ 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)) }; struct netdev_queue {
@@ -1778,7 +1781,7 @@ 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); }
@@ -1792,7 +1795,7 @@ 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); } /**
@@ -1824,7 +1827,7 @@ 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); }
@@ -1856,7 +1859,7 @@ 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); } /**
@@ -1883,7 +1886,7 @@ 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); } /**
@@ -1897,9 +1900,16 @@ 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; +} + } /**
@@ -1986,7 +1996,7 @@ 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); }
diff --git a/net/core/dev.c b/net/core/dev.c
index 17d67b5..a7f8c38 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c@@ -2190,7 +2190,7 @@ 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);
@@ -2464,7 +2464,7 @@ 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);
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index adf84dd..9c71328 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c@@ -75,7 +75,7 @@ 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);
@@ -316,7 +316,7 @@ 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);
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index e35a6fb..5c481c5 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c@@ -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;
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 69fca27..7c84f08 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c@@ -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;
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index edc1950..49131d7 100644
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c@@ -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)
diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index a3b7120..283bfe3 100644
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c@@ -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:
--
1.7.3.1