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man: tc: Describe qevents 

Add some general remarks about qevents.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David Ahern <dsahern@kernel.org>
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Petr Machata 2020-06-30 13:14:51 +03:00 committed by David Ahern
parent 01bb0bcd00
commit 3cf51fb3c8
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man/man8/tc.8
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@ -254,6 +254,25 @@ Traffic control filter that matches every packet. See
.BR tc-matchall (8) .BR tc-matchall (8)
for details. 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 .SH CLASSLESS QDISCS
The classless qdiscs are: The classless qdiscs are:
.TP .TP