diff options
Diffstat (limited to 'target/linux/generic/patches-3.12/663-remove_pfifo_fast.patch')
| -rw-r--r-- | target/linux/generic/patches-3.12/663-remove_pfifo_fast.patch | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.12/663-remove_pfifo_fast.patch b/target/linux/generic/patches-3.12/663-remove_pfifo_fast.patch new file mode 100644 index 0000000..3420d3d --- /dev/null +++ b/target/linux/generic/patches-3.12/663-remove_pfifo_fast.patch @@ -0,0 +1,143 @@ +--- a/net/sched/sch_generic.c ++++ b/net/sched/sch_generic.c +@@ -401,140 +401,6 @@ static struct Qdisc noqueue_qdisc = { + .busylock = __SPIN_LOCK_UNLOCKED(noqueue_qdisc.busylock), + }; + +- +-static const u8 prio2band[TC_PRIO_MAX + 1] = { +- 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 +-}; +- +-/* 3-band FIFO queue: old style, but should be a bit faster than +- generic prio+fifo combination. +- */ +- +-#define PFIFO_FAST_BANDS 3 +- +-/* +- * 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) +-{ +- return priv->q + band; +-} +- +-static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *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); +- +- priv->bitmap |= (1 << band); +- qdisc->q.qlen++; +- return __qdisc_enqueue_tail(skb, qdisc, list); +- } +- +- return qdisc_drop(skb, qdisc); +-} +- +-static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) +-{ +- struct pfifo_fast_priv *priv = qdisc_priv(qdisc); +- int band = bitmap2band[priv->bitmap]; +- +- 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 struct sk_buff *pfifo_fast_peek(struct Qdisc *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 pfifo_fast_priv *priv = qdisc_priv(qdisc); +- +- for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) +- __qdisc_reset_queue(qdisc, band2list(priv, prio)); +- +- priv->bitmap = 0; +- qdisc->qstats.backlog = 0; +- qdisc->q.qlen = 0; +-} +- +-static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) +-{ +- struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; +- +- memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1); +- if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) +- goto nla_put_failure; +- return skb->len; +- +-nla_put_failure: +- return -1; +-} +- +-static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt) +-{ +- int prio; +- struct pfifo_fast_priv *priv = qdisc_priv(qdisc); +- +- for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) +- skb_queue_head_init(band2list(priv, prio)); +- +- /* Can by-pass the queue discipline */ +- qdisc->flags |= TCQ_F_CAN_BYPASS; +- return 0; +-} +- +-struct Qdisc_ops pfifo_fast_ops __read_mostly = { +- .id = "pfifo_fast", +- .priv_size = sizeof(struct pfifo_fast_priv), +- .enqueue = pfifo_fast_enqueue, +- .dequeue = pfifo_fast_dequeue, +- .peek = pfifo_fast_peek, +- .init = pfifo_fast_init, +- .reset = pfifo_fast_reset, +- .dump = pfifo_fast_dump, +- .owner = THIS_MODULE, +-}; +- + static struct lock_class_key qdisc_tx_busylock; + + struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |