From: Jakub Kicinski <kuba@kernel.org>
To: Ido Schimmel <idosch@idosch.org>
Cc: netdev@vger.kernel.org, davem@davemloft.net, jiri@mellanox.com,
petrm@mellanox.com, jhs@mojatatu.com, xiyou.wangcong@gmail.com,
mlxsw@mellanox.com, Ido Schimmel <idosch@mellanox.com>
Subject: Re: [PATCH net-next 3/6] net: sched: RED: Introduce an ECN tail-dropping mode
Date: Mon, 9 Mar 2020 15:12:55 -0700 [thread overview]
Message-ID: <20200309151255.29bb3a4b@kicinski-fedora-PC1C0HJN> (raw)
In-Reply-To: <20200309183503.173802-4-idosch@idosch.org>
On Mon, 9 Mar 2020 20:35:00 +0200 Ido Schimmel wrote:
> diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
> index f9839d68b811..d72db7643a37 100644
> --- a/net/sched/sch_red.c
> +++ b/net/sched/sch_red.c
> @@ -44,7 +44,8 @@ struct red_sched_data {
> struct Qdisc *qdisc;
> };
>
> -#define RED_SUPPORTED_FLAGS (TC_RED_ECN | TC_RED_HARDDROP | TC_RED_ADAPTATIVE)
> +#define RED_SUPPORTED_FLAGS (TC_RED_ECN | TC_RED_HARDDROP | \
> + TC_RED_ADAPTATIVE | TC_RED_TAILDROP)
>
> static inline int red_use_ecn(struct red_sched_data *q)
> {
> @@ -56,6 +57,11 @@ static inline int red_use_harddrop(struct red_sched_data *q)
> return q->flags & TC_RED_HARDDROP;
> }
>
> +static inline int red_use_taildrop(struct red_sched_data *q)
Please don't do static inlines in C code, even if the neighboring code
does.
> +{
> + return q->flags & TC_RED_TAILDROP;
> +}
> +
> static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch,
> struct sk_buff **to_free)
> {
> @@ -76,23 +82,36 @@ static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch,
>
> case RED_PROB_MARK:
> qdisc_qstats_overlimit(sch);
> - if (!red_use_ecn(q) || !INET_ECN_set_ce(skb)) {
> + if (!red_use_ecn(q)) {
> q->stats.prob_drop++;
> goto congestion_drop;
> }
>
> - q->stats.prob_mark++;
> + if (INET_ECN_set_ce(skb)) {
> + q->stats.prob_mark++;
> + } else if (red_use_taildrop(q)) {
This condition is inverted, no?
If user requested taildrop the packet should be queued.
> + q->stats.prob_drop++;
> + goto congestion_drop;
> + }
> +
> + /* Non-ECT packet in ECN taildrop mode: queue it. */
> break;
>
> case RED_HARD_MARK:
> qdisc_qstats_overlimit(sch);
> - if (red_use_harddrop(q) || !red_use_ecn(q) ||
> - !INET_ECN_set_ce(skb)) {
> + if (red_use_harddrop(q) || !red_use_ecn(q)) {
> + q->stats.forced_drop++;
> + goto congestion_drop;
> + }
> +
> + if (INET_ECN_set_ce(skb)) {
> + q->stats.forced_mark++;
> + } else if (!red_use_taildrop(q)) {
This one looks correct.
> q->stats.forced_drop++;
> goto congestion_drop;
> }
>
> - q->stats.forced_mark++;
> + /* Non-ECT packet in ECN taildrop mode: queue it. */
> break;
> }
>
next prev parent reply other threads:[~2020-03-09 22:12 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-09 18:34 [PATCH net-next 0/6] RED: Introduce an ECN tail-dropping mode Ido Schimmel
2020-03-09 18:34 ` [PATCH net-next 1/6] selftests: qdiscs: Add TDC test for RED Ido Schimmel
2020-03-10 15:40 ` Roman Mashak
2020-03-10 16:56 ` Petr Machata
2020-03-10 17:28 ` Roman Mashak
2020-03-09 18:34 ` [PATCH net-next 2/6] net: sched: Add centralized RED flag checking Ido Schimmel
2020-03-09 22:18 ` Jakub Kicinski
2020-03-10 9:48 ` Petr Machata
2020-03-10 19:53 ` Jakub Kicinski
2020-03-10 22:23 ` Petr Machata
2020-03-10 23:00 ` Jakub Kicinski
2020-03-10 23:53 ` Petr Machata
2020-03-09 18:35 ` [PATCH net-next 3/6] net: sched: RED: Introduce an ECN tail-dropping mode Ido Schimmel
2020-03-09 22:12 ` Jakub Kicinski [this message]
2020-03-10 9:48 ` Petr Machata
2020-03-09 18:35 ` [PATCH net-next 4/6] mlxsw: spectrum_qdisc: Offload RED " Ido Schimmel
2020-03-09 18:35 ` [PATCH net-next 5/6] selftests: qdiscs: RED: Add taildrop tests Ido Schimmel
2020-03-09 18:35 ` [PATCH net-next 6/6] selftests: mlxsw: RED: Test RED ECN taildrop offload Ido Schimmel
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