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domenico
159
target/linux/generic/hack-4.14/662-remove_pfifo_fast.patch
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159
target/linux/generic/hack-4.14/662-remove_pfifo_fast.patch
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@@ -0,0 +1,159 @@
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From b531d492d5ef1cf9dba0f4888eb5fd8624a6d762 Mon Sep 17 00:00:00 2001
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From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 7 Jul 2017 17:23:42 +0200
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Subject: net: sched: switch default qdisc from pfifo_fast to fq_codel and remove pfifo_fast
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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net/sched/sch_generic.c | 140 ------------------------------------------------
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1 file changed, 140 deletions(-)
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--- a/net/sched/sch_generic.c
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+++ b/net/sched/sch_generic.c
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@@ -454,146 +454,6 @@ struct Qdisc_ops noqueue_qdisc_ops __rea
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.owner = THIS_MODULE,
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};
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-static const u8 prio2band[TC_PRIO_MAX + 1] = {
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- 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1
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-};
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-
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-/* 3-band FIFO queue: old style, but should be a bit faster than
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- generic prio+fifo combination.
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- */
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-
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-#define PFIFO_FAST_BANDS 3
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-
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-/*
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- * Private data for a pfifo_fast scheduler containing:
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- * - queues for the three band
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- * - bitmap indicating which of the bands contain skbs
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- */
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-struct pfifo_fast_priv {
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- u32 bitmap;
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- struct qdisc_skb_head q[PFIFO_FAST_BANDS];
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-};
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-
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-/*
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- * Convert a bitmap to the first band number where an skb is queued, where:
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- * bitmap=0 means there are no skbs on any band.
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- * bitmap=1 means there is an skb on band 0.
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- * bitmap=7 means there are skbs on all 3 bands, etc.
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- */
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-static const int bitmap2band[] = {-1, 0, 1, 0, 2, 0, 1, 0};
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-
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-static inline struct qdisc_skb_head *band2list(struct pfifo_fast_priv *priv,
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- int band)
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-{
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- return priv->q + band;
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-}
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-
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-static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc,
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- struct sk_buff **to_free)
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-{
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- if (qdisc->q.qlen < qdisc_dev(qdisc)->tx_queue_len) {
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- int band = prio2band[skb->priority & TC_PRIO_MAX];
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- struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
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- struct qdisc_skb_head *list = band2list(priv, band);
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-
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- priv->bitmap |= (1 << band);
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- qdisc->q.qlen++;
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- return __qdisc_enqueue_tail(skb, qdisc, list);
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- }
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-
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- return qdisc_drop(skb, qdisc, to_free);
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-}
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-
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-static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc)
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-{
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- struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
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- int band = bitmap2band[priv->bitmap];
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-
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- if (likely(band >= 0)) {
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- struct qdisc_skb_head *qh = band2list(priv, band);
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- struct sk_buff *skb = __qdisc_dequeue_head(qh);
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-
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- if (likely(skb != NULL)) {
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- qdisc_qstats_backlog_dec(qdisc, skb);
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- qdisc_bstats_update(qdisc, skb);
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- }
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-
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- qdisc->q.qlen--;
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- if (qh->qlen == 0)
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- priv->bitmap &= ~(1 << band);
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-
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- return skb;
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- }
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-
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- return NULL;
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-}
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-
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-static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc)
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-{
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- struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
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- int band = bitmap2band[priv->bitmap];
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-
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- if (band >= 0) {
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- struct qdisc_skb_head *qh = band2list(priv, band);
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-
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- return qh->head;
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- }
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-
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- return NULL;
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-}
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-
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-static void pfifo_fast_reset(struct Qdisc *qdisc)
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-{
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- int prio;
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- struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
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-
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- for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
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- __qdisc_reset_queue(band2list(priv, prio));
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-
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- priv->bitmap = 0;
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- qdisc->qstats.backlog = 0;
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- qdisc->q.qlen = 0;
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-}
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-
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-static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb)
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-{
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- struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS };
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-
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- memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1);
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- if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
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- goto nla_put_failure;
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- return skb->len;
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-
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-nla_put_failure:
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- return -1;
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-}
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-
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-static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt)
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-{
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- int prio;
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- struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
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-
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- for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
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- qdisc_skb_head_init(band2list(priv, prio));
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-
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- /* Can by-pass the queue discipline */
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- qdisc->flags |= TCQ_F_CAN_BYPASS;
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- return 0;
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-}
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-
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-struct Qdisc_ops pfifo_fast_ops __read_mostly = {
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- .id = "pfifo_fast",
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- .priv_size = sizeof(struct pfifo_fast_priv),
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- .enqueue = pfifo_fast_enqueue,
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- .dequeue = pfifo_fast_dequeue,
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- .peek = pfifo_fast_peek,
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- .init = pfifo_fast_init,
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- .reset = pfifo_fast_reset,
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- .dump = pfifo_fast_dump,
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- .owner = THIS_MODULE,
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-};
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-EXPORT_SYMBOL(pfifo_fast_ops);
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-
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static struct lock_class_key qdisc_tx_busylock;
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static struct lock_class_key qdisc_running_key;
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