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Date:   Tue, 26 May 2020 20:10:10 +0300
From:   Petr Machata <>
Cc:     Jakub Kicinski <>,
        Eric Dumazet <>,,,,
        Petr Machata <>
Subject: [RFC PATCH iproute2-next 3/4] man: tc: Describe qevents

Add some general remarks about qevents.

Signed-off-by: Petr Machata <>
 man/man8/tc.8 | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/man/man8/tc.8 b/man/man8/tc.8
index e8e0cd0f..970440f6 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.
+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
+For example:
+tc qdisc add dev eth0 root handle 1: red limit 500K avpkt 1K \\
+   qevent early block 10
+tc filter add block 10 matchall action mirred egress mirror dev eth1
 The classless qdiscs are:

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