kernel: copy kernel 4.19 code to 5.4

No changes were done to the patches while coping them. Currently they do
not apply on top of kernel 5.4.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 220 insertions, 0 deletions

diff --git a/target/linux/generic/hack-5.4/662-remove_pfifo_fast.patch b/target/linux/generic/hack-5.4/662-remove_pfifo_fast.patch
new file mode 100644
index 0000000000..e49507a590
--- /dev/null
+++ b/target/linux/generic/hack-5.4/662-remove_pfifo_fast.patch
@@ -0,0 +1,220 @@
+From b531d492d5ef1cf9dba0f4888eb5fd8624a6d762 Mon Sep 17 00:00:00 2001
+From: Felix Fietkau <nbd@nbd.name>
+Date: Fri, 7 Jul 2017 17:23:42 +0200
+Subject: net: sched: switch default qdisc from pfifo_fast to fq_codel and remove pfifo_fast
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+ net/sched/sch_generic.c | 140 ------------------------------------------------
+ 1 file changed, 140 deletions(-)
+
+--- a/net/sched/sch_generic.c
++++ b/net/sched/sch_generic.c
+@@ -612,207 +612,6 @@ struct Qdisc_ops noqueue_qdisc_ops __rea
+ 	.owner		=	THIS_MODULE,
+ };
+ 
+-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:
+- *	- rings for priority bands
+- */
+-struct pfifo_fast_priv {
+-	struct skb_array q[PFIFO_FAST_BANDS];
+-};
+-
+-static inline struct skb_array *band2list(struct pfifo_fast_priv *priv,
+-					  int band)
+-{
+-	return &priv->q[band];
+-}
+-
+-static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc,
+-			      struct sk_buff **to_free)
+-{
+-	int band = prio2band[skb->priority & TC_PRIO_MAX];
+-	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
+-	struct skb_array *q = band2list(priv, band);
+-	unsigned int pkt_len = qdisc_pkt_len(skb);
+-	int err;
+-
+-	err = skb_array_produce(q, skb);
+-
+-	if (unlikely(err))
+-		return qdisc_drop_cpu(skb, qdisc, to_free);
+-
+-	qdisc_qstats_atomic_qlen_inc(qdisc);
+-	/* Note: skb can not be used after skb_array_produce(),
+-	 * so we better not use qdisc_qstats_cpu_backlog_inc()
+-	 */
+-	this_cpu_add(qdisc->cpu_qstats->backlog, pkt_len);
+-	return NET_XMIT_SUCCESS;
+-}
+-
+-static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc)
+-{
+-	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
+-	struct sk_buff *skb = NULL;
+-	int band;
+-
+-	for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) {
+-		struct skb_array *q = band2list(priv, band);
+-
+-		if (__skb_array_empty(q))
+-			continue;
+-
+-		skb = __skb_array_consume(q);
+-	}
+-	if (likely(skb)) {
+-		qdisc_qstats_cpu_backlog_dec(qdisc, skb);
+-		qdisc_bstats_cpu_update(qdisc, skb);
+-		qdisc_qstats_atomic_qlen_dec(qdisc);
+-	}
+-
+-	return skb;
+-}
+-
+-static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc)
+-{
+-	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
+-	struct sk_buff *skb = NULL;
+-	int band;
+-
+-	for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) {
+-		struct skb_array *q = band2list(priv, band);
+-
+-		skb = __skb_array_peek(q);
+-	}
+-
+-	return skb;
+-}
+-
+-static void pfifo_fast_reset(struct Qdisc *qdisc)
+-{
+-	int i, band;
+-	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
+-
+-	for (band = 0; band < PFIFO_FAST_BANDS; band++) {
+-		struct skb_array *q = band2list(priv, band);
+-		struct sk_buff *skb;
+-
+-		/* NULL ring is possible if destroy path is due to a failed
+-		 * skb_array_init() in pfifo_fast_init() case.
+-		 */
+-		if (!q->ring.queue)
+-			continue;
+-
+-		while ((skb = __skb_array_consume(q)) != NULL)
+-			kfree_skb(skb);
+-	}
+-
+-	for_each_possible_cpu(i) {
+-		struct gnet_stats_queue *q = per_cpu_ptr(qdisc->cpu_qstats, i);
+-
+-		q->backlog = 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,
+-			   struct netlink_ext_ack *extack)
+-{
+-	unsigned int qlen = qdisc_dev(qdisc)->tx_queue_len;
+-	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
+-	int prio;
+-
+-	/* guard against zero length rings */
+-	if (!qlen)
+-		return -EINVAL;
+-
+-	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
+-		struct skb_array *q = band2list(priv, prio);
+-		int err;
+-
+-		err = skb_array_init(q, qlen, GFP_KERNEL);
+-		if (err)
+-			return -ENOMEM;
+-	}
+-
+-	/* Can by-pass the queue discipline */
+-	qdisc->flags |= TCQ_F_CAN_BYPASS;
+-	return 0;
+-}
+-
+-static void pfifo_fast_destroy(struct Qdisc *sch)
+-{
+-	struct pfifo_fast_priv *priv = qdisc_priv(sch);
+-	int prio;
+-
+-	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
+-		struct skb_array *q = band2list(priv, prio);
+-
+-		/* NULL ring is possible if destroy path is due to a failed
+-		 * skb_array_init() in pfifo_fast_init() case.
+-		 */
+-		if (!q->ring.queue)
+-			continue;
+-		/* Destroy ring but no need to kfree_skb because a call to
+-		 * pfifo_fast_reset() has already done that work.
+-		 */
+-		ptr_ring_cleanup(&q->ring, NULL);
+-	}
+-}
+-
+-static int pfifo_fast_change_tx_queue_len(struct Qdisc *sch,
+-					  unsigned int new_len)
+-{
+-	struct pfifo_fast_priv *priv = qdisc_priv(sch);
+-	struct skb_array *bands[PFIFO_FAST_BANDS];
+-	int prio;
+-
+-	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
+-		struct skb_array *q = band2list(priv, prio);
+-
+-		bands[prio] = q;
+-	}
+-
+-	return skb_array_resize_multiple(bands, PFIFO_FAST_BANDS, new_len,
+-					 GFP_KERNEL);
+-}
+-
+-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,
+-	.destroy	=	pfifo_fast_destroy,
+-	.reset		=	pfifo_fast_reset,
+-	.dump		=	pfifo_fast_dump,
+-	.change_tx_queue_len =  pfifo_fast_change_tx_queue_len,
+-	.owner		=	THIS_MODULE,
+-	.static_flags	=	TCQ_F_NOLOCK | TCQ_F_CPUSTATS,
+-};
+-EXPORT_SYMBOL(pfifo_fast_ops);
+-
+ static struct lock_class_key qdisc_tx_busylock;
+ static struct lock_class_key qdisc_running_key;
+