netdev - [PATCH iproute2-next v2 3/4] man: tc: Describe qevents

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Message-Id: <aa54b0b3a97ae3355b8e91089cd3944ab975347d.1593509090.git.petrm@mellanox.com>
Date:   Tue, 30 Jun 2020 13:14:51 +0300
From:   Petr Machata <petrm@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        David Ahern <dsahern@...il.com>,
        Petr Machata <petrm@...lanox.com>
Subject: [PATCH iproute2-next v2 3/4] man: tc: Describe qevents

Add some general remarks about qevents.

Signed-off-by: Petr Machata <petrm@...lanox.com>
---

Notes:
    v2:
    - s/early/early_drop/ in the example.

 man/man8/tc.8 | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/man/man8/tc.8 b/man/man8/tc.8
index e8e0cd0f..eba73dbf 100644
--- a/man/man8/tc.8
+++ b/man/man8/tc.8
@@ -254,6 +254,25 @@ Traffic control filter that matches every packet. See
 .BR tc-matchall (8)
 for details.
 
+.SH QEVENTS
+Qdiscs may invoke user-configured actions when certain interesting events
+take place in the qdisc. Each qevent can either be unused, or can have a
+block attached to it. To this block are then attached filters using the "tc
+block BLOCK_IDX" syntax. The block is executed when the qevent associated
+with the attachment point takes place. For example, packet could be
+dropped, or delayed, etc., depending on the qdisc and the qevent in
+question.
+
+For example:
+.PP
+.RS
+tc qdisc add dev eth0 root handle 1: red limit 500K avpkt 1K \\
+   qevent early_drop block 10
+.RE
+.RS
+tc filter add block 10 matchall action mirred egress mirror dev eth1
+.RE
+
 .SH CLASSLESS QDISCS
 The classless qdiscs are:
 .TP
-- 
2.20.1