bond_debugfs.c

Go to the documentation of this file.

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/netdevice.h>

#include "bonding.h"
#include "bond_alb.h"

#if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_NET_NS)

#include <linux/debugfs.h>
#include <linux/seq_file.h>

static struct dentry *bonding_debug_root;

/*
 *  Show RLB hash table
 */
static int bond_debug_rlb_hash_show(struct seq_file *m, void *v)
{
    struct bonding *bond = m->private;
    struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
    struct rlb_client_info *client_info;
    u32 hash_index;

    if (bond->params.mode != BOND_MODE_ALB)
        return 0;

    seq_printf(m, "SourceIP        DestinationIP   "
            "Destination MAC   DEV\n");

    spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));

    hash_index = bond_info->rx_hashtbl_head;
    for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
        client_info = &(bond_info->rx_hashtbl[hash_index]);
        seq_printf(m, "%-15pI4 %-15pI4 %-17pM %s\n",
            &client_info->ip_src,
            &client_info->ip_dst,
            &client_info->mac_dst,
            client_info->slave->dev->name);
    }

    spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));

    return 0;
}

static int bond_debug_rlb_hash_open(struct inode *inode, struct file *file)
{
    return single_open(file, bond_debug_rlb_hash_show, inode->i_private);
}

static const struct file_operations bond_debug_rlb_hash_fops = {
    .owner      = THIS_MODULE,
    .open       = bond_debug_rlb_hash_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = single_release,
};

void bond_debug_register(struct bonding *bond)
{
    if (!bonding_debug_root)
        return;

    bond->debug_dir =
        debugfs_create_dir(bond->dev->name, bonding_debug_root);

    if (!bond->debug_dir) {
        pr_warning("%s: Warning: failed to register to debugfs\n",
            bond->dev->name);
        return;
    }

    debugfs_create_file("rlb_hash_table", 0400, bond->debug_dir,
                bond, &bond_debug_rlb_hash_fops);
}

void bond_debug_unregister(struct bonding *bond)
{
    if (!bonding_debug_root)
        return;

    debugfs_remove_recursive(bond->debug_dir);
}

void bond_debug_reregister(struct bonding *bond)
{
    struct dentry *d;

    if (!bonding_debug_root)
        return;

    d = debugfs_rename(bonding_debug_root, bond->debug_dir,
               bonding_debug_root, bond->dev->name);
    if (d) {
        bond->debug_dir = d;
    } else {
        pr_warning("%s: Warning: failed to reregister, "
                "so just unregister old one\n",
                bond->dev->name);
        bond_debug_unregister(bond);
    }
}

void bond_create_debugfs(void)
{
    bonding_debug_root = debugfs_create_dir("bonding", NULL);

    if (!bonding_debug_root) {
        pr_warning("Warning: Cannot create bonding directory"
                " in debugfs\n");
    }
}

void bond_destroy_debugfs(void)
{
    debugfs_remove_recursive(bonding_debug_root);
    bonding_debug_root = NULL;
}


#else /* !CONFIG_DEBUG_FS */

void bond_debug_register(struct bonding *bond)
{
}

void bond_debug_unregister(struct bonding *bond)
{
}

void bond_debug_reregister(struct bonding *bond)
{
}

void bond_create_debugfs(void)
{
}

void bond_destroy_debugfs(void)
{
}

#endif /* CONFIG_DEBUG_FS */