From 7007ba630e4a6f809eab9abfc0e3a6e864e9d880 Mon Sep 17 00:00:00 2001 From: Cong Wang Date: Thu, 25 Jan 2018 18:26:24 -0800 Subject: [PATCH] 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 Signed-off-by: Cong Wang Signed-off-by: David S. Miller --- net/sched/sch_generic.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) 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, };