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Date: Thu, 11 Jun 2009 18:05:55 +0900
From: Minoru Usui <usui@....nes.nec.co.jp>
To: containers@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc: tgraf@...g.ch, hadi@...erus.ca, jarkao2@...il.com
Subject: [PATCH 1/1] cls_cgroup: unify classid syntax to tc
cls_cgroup: unify classid syntax to tc
This patch unifies classid syntax of cls_cgroup to tc.
In present implementation of cls_cgroup, classid read/write syntax is different from tc's one.
tc 1:10
write 0x10010 (hexadecimal)
read 65552 (decimal)
-------------------------------------------------
# echo 0x10010 > /cgroup/net/net_cls.classid
# cat /cgroup/net/net_cls.classid
65552
-------------------------------------------------
This is very inconvenient, so I made a patch which enables only tc syntax.
If we don't classify with net_cls.classid, we write 0 to net_cls.classid.
(This behavior is the same as present implementation.)
-------------------------------------------------
# echo 1:10 > /cgroup/net/net_cls.classid
# cat /cgroup/net/net_cls.classid
1:10
# echo 0 > /cgroup/net/net_cls.classid
# cat /cgroup/net/net_cls.classid
0
-------------------------------------------------
Signed-off-by: Minoru Usui <usui@....nes.nec.co.jp>
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index e5becb9..6d87d00 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
+#include <linux/ctype.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/cgroup.h>
@@ -55,17 +56,76 @@ static void cgrp_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
kfree(cgrp_cls_state(cgrp));
}
-static u64 read_classid(struct cgroup *cgrp, struct cftype *cft)
+#define CLS_CGROUP_CLASSID_LEN 16
+
+static ssize_t read_classid(struct cgroup *cgrp, struct cftype *cft,
+ struct file *file, char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ u32 value;
+ char classid[CLS_CGROUP_CLASSID_LEN];
+
+ value = cgrp_cls_state(cgrp)->classid;
+ if (value)
+ sprintf(classid, "%x:%x\n",
+ TC_H_MAJ(value)>>16, TC_H_MIN(value));
+ else
+ strcpy(classid, "0\n");
+
+ return simple_read_from_buffer(buf, nbytes, ppos,
+ classid, strlen(classid));
+}
+
+static int get_tc_classid(u32 *classid, const char *str)
{
- return cgrp_cls_state(cgrp)->classid;
+ u32 maj, min;
+ char *p;
+
+ /* check "0" for reset request */
+ if (!strcmp(str, "0")) {
+ *classid = 0;
+ return 0;
+ }
+
+ /* parse major number */
+ maj = simple_strtoul(str, &p, 16);
+ if (p == str) {
+ maj = 0;
+ if (*p != ':')
+ return -EINVAL;
+ }
+
+ /* parse minor number */
+ if (*p == ':') {
+ if (maj >= (1<<16))
+ return -EINVAL;
+
+ str = p + 1;
+ min = simple_strtoul(str, &p, 16);
+ if (*p != 0)
+ return -EINVAL;
+ if (min >= (1<<16))
+ return -EINVAL;
+ } else if (*p != 0)
+ return -EINVAL;
+
+ *classid = TC_H_MAKE(maj<<16, min);
+
+ return 0;
}
-static int write_classid(struct cgroup *cgrp, struct cftype *cft, u64 value)
+static int write_classid(struct cgroup *cgrp, struct cftype *cft,
+ const char *buf)
{
+ u32 classid;
+
if (!cgroup_lock_live_group(cgrp))
return -ENODEV;
- cgrp_cls_state(cgrp)->classid = (u32) value;
+ if (get_tc_classid(&classid, buf) < 0)
+ return -EINVAL;
+
+ cgrp_cls_state(cgrp)->classid = classid;
cgroup_unlock();
@@ -75,8 +135,8 @@ static int write_classid(struct cgroup *cgrp, struct cftype *cft, u64 value)
static struct cftype ss_files[] = {
{
.name = "classid",
- .read_u64 = read_classid,
- .write_u64 = write_classid,
+ .read = read_classid,
+ .write_string = write_classid,
},
};
--
Minoru Usui <usui@....nes.nec.co.jp>
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