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net: add network priority cgroup infrastructure (v4)

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This patch adds in the infrastructure code to create the network priority
cgroup.  The cgroup, in addition to the standard processes file creates two
control files:

1) prioidx - This is a read-only file that exports the index of this cgroup.
This is a value that is both arbitrary and unique to a cgroup in this subsystem,
and is used to index the per-device priority map

2) priomap - This is a writeable file.  On read it reports a table of 2-tuples
<name:priority> where name is the name of a network interface and priority is
indicates the priority assigned to frames egresessing on the named interface and
originating from a pid in this cgroup

This cgroup allows for skb priority to be set prior to a root qdisc getting
selected. This is benenficial for DCB enabled systems, in that it allows for any
application to use dcb configured priorities so without application modification

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
CC: Robert Love <robert.w.love@intel.com>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman
2011-11-22 05:10:51 +00:00
committed by David S. Miller
parent 202ff1c26c
commit 5bc1421e34
10 changed files with 469 additions and 1 deletions
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65
include/net/netprio_cgroup.h Normal file
View File

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/*
* netprio_cgroup.h Control Group Priority set
*
*
* Authors: Neil Horman <nhorman@tuxdriver.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#ifndef _NETPRIO_CGROUP_H
#define _NETPRIO_CGROUP_H
#include <linux/module.h>
#include <linux/cgroup.h>
#include <linux/hardirq.h>
#include <linux/rcupdate.h>
struct cgroup_netprio_state
{
struct cgroup_subsys_state css;
u32 prioidx;
};
struct netprio_map {
struct rcu_head rcu;
u32 priomap_len;
u32 priomap[];
};
#ifdef CONFIG_CGROUPS
#ifndef CONFIG_NETPRIO_CGROUP
extern int net_prio_subsys_id;
#endif
extern void sock_update_netprioidx(struct sock *sk);
static inline struct cgroup_netprio_state
*task_netprio_state(struct task_struct *p)
{
#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
return container_of(task_subsys_state(p, net_prio_subsys_id),
struct cgroup_netprio_state, css);
#else
return NULL;
#endif
}
#else
#define sock_update_netprioidx(sk)
#define skb_update_prio(skb)
static inline struct cgroup_netprio_state
*task_netprio_state(struct task_struct *p)
{
return NULL;
}
#endif
#endif /* _NET_CLS_CGROUP_H */