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Commit 077f02f1 authored by Rami Rosen's avatar Rami Rosen Committed by David S. Miller
Browse files

Documentation: cgroup: add documentation for net_cls cgroups. 



This patch adds a new file, Documentation/cgroups/net_cls.txt, with info
about net_cls cgroups, and updates the 00-INDEX accordingly.

Signed-off-by: default avatarRami Rosen <ramirose@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f53adae4

Documentation/cgroups/00-INDEX

+2 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ memcg_test.txt 
	- Memory Resource Controller; implementation details.

memory.txt

	- Memory Resource Controller; design, accounting, interface, testing.

net_cls.txt

	- Network classifier cgroups details and usages.

net_prio.txt

	- Network priority cgroups details and usages.

resource_counter.txt

Documentation/cgroups/net_cls.txt

0 → 100644
+34 −0
Original line number Diff line number Diff line 
Network classifier cgroup

-------------------------



The Network classifier cgroup provides an interface to

tag network packets with a class identifier (classid).



The Traffic Controller (tc) can be used to assign

different priorities to packets from different cgroups.



Creating a net_cls cgroups instance creates a net_cls.classid file.

This net_cls.classid value is initialized to 0.



You can write hexadecimal values to net_cls.classid; the format for these

values is 0xAAAABBBB; AAAA is the major handle number and BBBB

is the minor handle number.

Reading net_cls.classid yields a decimal result.



Example:

mkdir /sys/fs/cgroup/net_cls

mount -t cgroup -onet_cls net_cls /sys/fs/cgroup/net_cls

mkdir /sys/fs/cgroup/net_cls/0

echo 0x100001 >  /sys/fs/cgroup/net_cls/0/net_cls.classid

	- setting a 10:1 handle.



cat /sys/fs/cgroup/net_cls/0/net_cls.classid

1048577



configuring tc:

tc qdisc add dev eth0 root handle 10: htb



tc class add dev eth0 parent 10: classid 10:1 htb rate 40mbit

 - creating traffic class 10:1



tc filter add dev eth0 parent 10: protocol ip prio 10 handle 1: cgroup