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authorCong Wang <xiyou.wangcong@gmail.com>2018-01-25 18:26:24 -0800
committerDavid S. Miller <davem@davemloft.net>2018-01-29 12:42:15 -0500
commit7007ba630e4a6f809eab9abfc0e3a6e864e9d880 (patch)
treed9dc654a4b66663779cea40ea7ac1fee6312c91e /net
parent48bfd55e7e4149a304e89c1999436cf52d094a27 (diff)
downloadlinux-7007ba630e4a6f809eab9abfc0e3a6e864e9d880.tar.bz2
net_sched: implement ->change_tx_queue_len() for pfifo_fast
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>
Diffstat (limited to 'net')
-rw-r--r--net/sched/sch_generic.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 08f9fa27e06e..190570f21b20 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -763,6 +763,23 @@ static void pfifo_fast_destroy(struct Qdisc *sch)
}
}
+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),
@@ -773,6 +790,7 @@ struct Qdisc_ops pfifo_fast_ops __read_mostly = {
.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,
};