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authorRami Rosen <ramirose@gmail.com>2013-04-08 08:04:20 +0400
committerDavid S. Miller <davem@davemloft.net>2013-04-09 00:55:28 +0400
commit077f02f1baee7c1eed800e95c7bb76a6be5226d4 (patch)
tree14f23789c2ae0731b2a2e3b9af1306c6e6042304
parentf53adae4eae5ad9f7343ff4a0fc68b468c981138 (diff)
downloadlinux-077f02f1baee7c1eed800e95c7bb76a6be5226d4.tar.xz
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: Rami Rosen <ramirose@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--Documentation/cgroups/00-INDEX2
-rw-r--r--Documentation/cgroups/net_cls.txt34
2 files changed, 36 insertions, 0 deletions
diff --git a/Documentation/cgroups/00-INDEX b/Documentation/cgroups/00-INDEX
index f5635a09c3f6..bc461b6425a7 100644
--- a/Documentation/cgroups/00-INDEX
+++ b/Documentation/cgroups/00-INDEX
@@ -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
diff --git a/Documentation/cgroups/net_cls.txt b/Documentation/cgroups/net_cls.txt
new file mode 100644
index 000000000000..9face6bb578a
--- /dev/null
+++ b/Documentation/cgroups/net_cls.txt
@@ -0,0 +1,34 @@
+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