netprio_cgroup.h

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/*
 * netprio_cgroup.h         Control Group Priority set
 *
 *
 * Authors: Neil Horman <[email protected]>
 *
 * 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/cgroup.h>
#include <linux/hardirq.h>
#include <linux/rcupdate.h>


#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
struct netprio_map {
    struct rcu_head rcu;
    u32 priomap_len;
    u32 priomap[];
};

struct cgroup_netprio_state {
    struct cgroup_subsys_state css;
    u32 prioidx;
};

extern void sock_update_netprioidx(struct sock *sk, struct task_struct *task);

#if IS_BUILTIN(CONFIG_NETPRIO_CGROUP)

static inline u32 task_netprioidx(struct task_struct *p)
{
    struct cgroup_netprio_state *state;
    u32 idx;

    rcu_read_lock();
    state = container_of(task_subsys_state(p, net_prio_subsys_id),
                 struct cgroup_netprio_state, css);
    idx = state->prioidx;
    rcu_read_unlock();
    return idx;
}

#elif IS_MODULE(CONFIG_NETPRIO_CGROUP)

static inline u32 task_netprioidx(struct task_struct *p)
{
    struct cgroup_subsys_state *css;
    u32 idx = 0;

    rcu_read_lock();
    css = task_subsys_state(p, net_prio_subsys_id);
    if (css)
        idx = container_of(css,
                   struct cgroup_netprio_state, css)->prioidx;
    rcu_read_unlock();
    return idx;
}
#endif

#else /* !CONFIG_NETPRIO_CGROUP */

static inline u32 task_netprioidx(struct task_struct *p)
{
    return 0;
}

#define sock_update_netprioidx(sk, task)

#endif /* CONFIG_NETPRIO_CGROUP */

#endif  /* _NET_CLS_CGROUP_H */