kernel: remove out-of-tree patches for reducing qdisc truesize

The copy overhead can be quite expensive

Signed-off-by: Felix Fietkau <nbd@nbd.name>

7 files changed, 7 insertions, 111 deletions

diff --git a/target/linux/generic/patches-4.4/656-skb_reduce_truesize-helper.patch b/target/linux/generic/patches-4.4/656-skb_reduce_truesize-helper.patch
deleted file mode 100644
index dad74482ab..0000000000
--- a/target/linux/generic/patches-4.4/656-skb_reduce_truesize-helper.patch
+++ /dev/null
@@ -1,41 +0,0 @@
-From 4593a806e31119c5bd3faa00c7210ad862d515af Mon Sep 17 00:00:00 2001
-From: Dave Taht <dave.taht@bufferbloat.net>
-Date: Mon, 31 Dec 2012 10:02:21 -0800
-Subject: [PATCH 3/7] skb_reduce_truesize: helper function for shrinking skbs
- whenever needed
-
-On embedded devices in particular, large queues of small packets from the rx
-path with a large truesize can exist. Reducing their size can reduce
-memory pressure. skb_reduce_truesize is a helper function for doing this,
-when needed.
----
- include/linux/skbuff.h |   18 ++++++++++++++++++
- 1 file changed, 18 insertions(+)
-
---- a/include/linux/skbuff.h
-+++ b/include/linux/skbuff.h
-@@ -2224,6 +2224,24 @@ static inline void pskb_trim_unique(stru
- 	BUG_ON(err);
- }
- 
-+/*
-+ * Caller wants to reduce memory needs before queueing skb
-+ * The (expensive) copy should not be be done in fast path.
-+ */
-+static inline struct sk_buff *skb_reduce_truesize(struct sk_buff *skb)
-+{
-+	if (skb->truesize > 2 * SKB_TRUESIZE(skb->len)) {
-+		struct sk_buff *nskb;
-+		nskb = skb_copy_expand(skb, skb_headroom(skb), 0,
-+			GFP_ATOMIC | __GFP_NOWARN);
-+		if (nskb) {
-+			__kfree_skb(skb);
-+			skb = nskb;
-+		}
-+	}
-+	return skb;
-+}
-+
- /**
-  *	skb_orphan - orphan a buffer
-  *	@skb: buffer to orphan
diff --git a/target/linux/generic/patches-4.4/657-qdisc_reduce_truesize.patch b/target/linux/generic/patches-4.4/657-qdisc_reduce_truesize.patch
deleted file mode 100644
index d9f5b4fb63..0000000000
--- a/target/linux/generic/patches-4.4/657-qdisc_reduce_truesize.patch
+++ /dev/null
@@ -1,63 +0,0 @@
-From bc9fec2f87d57bdbff30d296605e24504513f65c Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Dave=20T=C3=A4ht?= <dave.taht@bufferbloat.net>
-Date: Mon, 17 Sep 2012 19:20:22 -0700
-Subject: [PATCH 4/7] net: add skb_reduce_truesize support to common qdiscs
-
-Reduce skb size under load when queues begin to fill on the
-commont qdiscs.
----
- net/sched/sch_codel.c    |    2 ++
- net/sched/sch_fifo.c     |   12 ++++++++----
- net/sched/sch_fq_codel.c |    2 ++
- 3 files changed, 12 insertions(+), 4 deletions(-)
-
---- a/net/sched/sch_codel.c
-+++ b/net/sched/sch_codel.c
-@@ -96,6 +96,8 @@ static int codel_qdisc_enqueue(struct sk
- 	struct codel_sched_data *q;
- 
- 	if (likely(qdisc_qlen(sch) < sch->limit)) {
-+		if(qdisc_qlen(sch) > 128)
-+			skb = skb_reduce_truesize(skb);
- 		codel_set_enqueue_time(skb);
- 		return qdisc_enqueue_tail(skb, sch);
- 	}
---- a/net/sched/sch_fifo.c
-+++ b/net/sched/sch_fifo.c
-@@ -29,17 +29,21 @@ static int bfifo_enqueue(struct sk_buff
- 
- static int pfifo_enqueue(struct sk_buff *skb, struct Qdisc *sch)
- {
--	if (likely(skb_queue_len(&sch->q) < sch->limit))
-+	if (likely(skb_queue_len(&sch->q) < sch->limit)) {
-+		if (skb_queue_len(&sch->q) > 128)
-+			skb = skb_reduce_truesize(skb);
- 		return qdisc_enqueue_tail(skb, sch);
--
-+	}
- 	return qdisc_reshape_fail(skb, sch);
- }
- 
- static int pfifo_tail_enqueue(struct sk_buff *skb, struct Qdisc *sch)
- {
--	if (likely(skb_queue_len(&sch->q) < sch->limit))
-+	if (likely(skb_queue_len(&sch->q) < sch->limit)) {
-+		if (skb_queue_len(&sch->q) > 128)
-+			skb = skb_reduce_truesize(skb);
- 		return qdisc_enqueue_tail(skb, sch);
--
-+	}
- 	/* queue full, remove one skb to fulfill the limit */
- 	__qdisc_queue_drop_head(sch, &sch->q);
- 	qdisc_qstats_drop(sch);
---- a/net/sched/sch_fq_codel.c
-+++ b/net/sched/sch_fq_codel.c
-@@ -187,6 +187,8 @@ static int fq_codel_enqueue(struct sk_bu
- 		return ret;
- 	}
- 	idx--;
-+	if (sch->q.qlen > 128)
-+		skb = skb_reduce_truesize(skb);
- 
- 	codel_set_enqueue_time(skb);
- 	flow = &q->flows[idx];
diff --git a/target/linux/generic/patches-4.4/660-fq_codel_defaults.patch b/target/linux/generic/patches-4.4/660-fq_codel_defaults.patch
index 5d99cd7fb4..bee4fcd86b 100644
--- a/target/linux/generic/patches-4.4/660-fq_codel_defaults.patch
+++ b/target/linux/generic/patches-4.4/660-fq_codel_defaults.patch
@@ -1,6 +1,6 @@
 --- a/net/sched/sch_fq_codel.c
 +++ b/net/sched/sch_fq_codel.c
-@@ -412,8 +412,8 @@ static int fq_codel_init(struct Qdisc *s
+@@ -410,8 +410,8 @@ static int fq_codel_init(struct Qdisc *s
  	struct fq_codel_sched_data *q = qdisc_priv(sch);
  	int i;
  
diff --git a/target/linux/generic/patches-4.4/661-fq_codel_keep_dropped_stats.patch b/target/linux/generic/patches-4.4/661-fq_codel_keep_dropped_stats.patch
index 0efc61b1b0..45a8d68367 100644
--- a/target/linux/generic/patches-4.4/661-fq_codel_keep_dropped_stats.patch
+++ b/target/linux/generic/patches-4.4/661-fq_codel_keep_dropped_stats.patch
@@ -1,6 +1,6 @@
 --- a/net/sched/sch_fq_codel.c
 +++ b/net/sched/sch_fq_codel.c
-@@ -200,7 +200,6 @@ static int fq_codel_enqueue(struct sk_bu
+@@ -198,7 +198,6 @@ static int fq_codel_enqueue(struct sk_bu
  		list_add_tail(&flow->flowchain, &q->new_flows);
  		q->new_flow_count++;
  		flow->deficit = q->quantum;
diff --git a/target/linux/generic/patches-4.4/662-use_fq_codel_by_default.patch b/target/linux/generic/patches-4.4/662-use_fq_codel_by_default.patch
index 096d239238..6910cfa0e6 100644
--- a/target/linux/generic/patches-4.4/662-use_fq_codel_by_default.patch
+++ b/target/linux/generic/patches-4.4/662-use_fq_codel_by_default.patch
@@ -13,7 +13,7 @@
  	  device, it has to decide which ones to send first, which ones to
 --- a/net/sched/sch_fq_codel.c
 +++ b/net/sched/sch_fq_codel.c
-@@ -623,7 +623,7 @@ static const struct Qdisc_class_ops fq_c
+@@ -621,7 +621,7 @@ static const struct Qdisc_class_ops fq_c
  	.walk		=	fq_codel_walk,
  };
  
@@ -22,7 +22,7 @@
  	.cl_ops		=	&fq_codel_class_ops,
  	.id		=	"fq_codel",
  	.priv_size	=	sizeof(struct fq_codel_sched_data),
-@@ -639,6 +639,7 @@ static struct Qdisc_ops fq_codel_qdisc_o
+@@ -637,6 +637,7 @@ static struct Qdisc_ops fq_codel_qdisc_o
  	.dump_stats =	fq_codel_dump_stats,
  	.owner		=	THIS_MODULE,
  };
diff --git a/target/linux/generic/patches-4.4/721-phy_packets.patch b/target/linux/generic/patches-4.4/721-phy_packets.patch
index 79af5f91cd..e232c0f563 100644
--- a/target/linux/generic/patches-4.4/721-phy_packets.patch
+++ b/target/linux/generic/patches-4.4/721-phy_packets.patch
@@ -52,7 +52,7 @@
  /**
   *	pskb_trim_unique - remove end from a paged unique (not cloned) buffer
   *	@skb: buffer to alter
-@@ -2332,16 +2336,6 @@ static inline struct sk_buff *dev_alloc_
+@@ -2314,16 +2318,6 @@ static inline struct sk_buff *dev_alloc_
  }
  
  
diff --git a/target/linux/generic/patches-4.4/834-ledtrig-libata.patch b/target/linux/generic/patches-4.4/834-ledtrig-libata.patch
index c60fc1a515..9a9203b140 100644
--- a/target/linux/generic/patches-4.4/834-ledtrig-libata.patch
+++ b/target/linux/generic/patches-4.4/834-ledtrig-libata.patch
@@ -110,11 +110,11 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
 +	for (i = 0; i < host->n_ports; i++) {
 +		if (unlikely(!host->ports[i]->ledtrig))
 +			continue;
- 
++
 +		snprintf(host->ports[i]->ledtrig_name,
 +			sizeof(host->ports[i]->ledtrig_name), "ata%u",
 +			host->ports[i]->print_id);
-+
+ 
 +		host->ports[i]->ledtrig->name = host->ports[i]->ledtrig_name;
 +
 +		if (led_trigger_register(host->ports[i]->ledtrig)) {