From: Cong Wang <xiyou.wangcong@gmail.com>
Date: Thu, 25 Jan 2018 18:26:24 -0800
Subject: net_sched: implement ->change_tx_queue_len() for pfifo_fast
Patch-mainline: v4.16-rc1
Git-commit: 7007ba630e4a6f809eab9abfc0e3a6e864e9d880
References: bsc#1109837

pfifo_fast used to drop based on qdisc_dev(qdisc)->tx_queue_len,
so we have to resize skb array when we change tx_queue_len.

Other qdiscs which read tx_queue_len are fine because they
all save it to sch->limit or somewhere else in qdisc during init.
They don't have to implement this, it is nicer if they do so
that users don't have to re-configure qdisc after changing
tx_queue_len.

Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/sched/sch_generic.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -746,6 +746,23 @@ static void pfifo_fast_destroy(struct Qd
 	}
 }
 
+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),
@@ -756,6 +773,7 @@ struct Qdisc_ops pfifo_fast_ops __read_m
 	.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,
 };