cregit-Linux how code gets into the kernel

Release 4.8 net/can/proc.c

Directory: net/can
/*
 * proc.c - procfs support for Protocol family CAN core module
 *
 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Volkswagen nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Alternatively, provided that this notice is retained in full, this
 * software may be distributed under the terms of the GNU General
 * Public License ("GPL") version 2, in which case the provisions of the
 * GPL apply INSTEAD OF those given above.
 *
 * The provided data structures and external interfaces from this code
 * are not restricted to be used by modules with a GPL compatible license.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 */

#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/if_arp.h>
#include <linux/can/core.h>

#include "af_can.h"

/*
 * proc filenames for the PF_CAN core
 */


#define CAN_PROC_VERSION     "version"

#define CAN_PROC_STATS       "stats"

#define CAN_PROC_RESET_STATS "reset_stats"

#define CAN_PROC_RCVLIST_ALL "rcvlist_all"

#define CAN_PROC_RCVLIST_FIL "rcvlist_fil"

#define CAN_PROC_RCVLIST_INV "rcvlist_inv"

#define CAN_PROC_RCVLIST_SFF "rcvlist_sff"

#define CAN_PROC_RCVLIST_EFF "rcvlist_eff"

#define CAN_PROC_RCVLIST_ERR "rcvlist_err"


static struct proc_dir_entry *can_dir;

static struct proc_dir_entry *pde_version;

static struct proc_dir_entry *pde_stats;

static struct proc_dir_entry *pde_reset_stats;

static struct proc_dir_entry *pde_rcvlist_all;

static struct proc_dir_entry *pde_rcvlist_fil;

static struct proc_dir_entry *pde_rcvlist_inv;

static struct proc_dir_entry *pde_rcvlist_sff;

static struct proc_dir_entry *pde_rcvlist_eff;

static struct proc_dir_entry *pde_rcvlist_err;


static int user_reset;


static const char rx_list_name[][8] = {
	[RX_ERR] = "rx_err",
	[RX_ALL] = "rx_all",
	[RX_FIL] = "rx_fil",
	[RX_INV] = "rx_inv",
};

/*
 * af_can statistics stuff
 */


static void can_init_stats(void) { /* * This memset function is called from a timer context (when * can_stattimer is active which is the default) OR in a process * context (reading the proc_fs when can_stattimer is disabled). */ memset(&can_stats, 0, sizeof(can_stats)); can_stats.jiffies_init = jiffies; can_pstats.stats_reset++; if (user_reset) { user_reset = 0; can_pstats.user_reset++; } }

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static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif, unsigned long count) { unsigned long rate; if (oldjif == newjif) return 0; /* see can_stat_update() - this should NEVER happen! */ if (count > (ULONG_MAX / HZ)) { printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n", count); return 99999999; } rate = (count * HZ) / (newjif - oldjif); return rate; }

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void can_stat_update(unsigned long data) { unsigned long j = jiffies; /* snapshot */ /* restart counting in timer context on user request */ if (user_reset) can_init_stats(); /* restart counting on jiffies overflow */ if (j < can_stats.jiffies_init) can_init_stats(); /* prevent overflow in calc_rate() */ if (can_stats.rx_frames > (ULONG_MAX / HZ)) can_init_stats(); /* prevent overflow in calc_rate() */ if (can_stats.tx_frames > (ULONG_MAX / HZ)) can_init_stats(); /* matches overflow - very improbable */ if (can_stats.matches > (ULONG_MAX / 100)) can_init_stats(); /* calc total values */ if (can_stats.rx_frames) can_stats.total_rx_match_ratio = (can_stats.matches * 100) / can_stats.rx_frames; can_stats.total_tx_rate = calc_rate(can_stats.jiffies_init, j, can_stats.tx_frames); can_stats.total_rx_rate = calc_rate(can_stats.jiffies_init, j, can_stats.rx_frames); /* calc current values */ if (can_stats.rx_frames_delta) can_stats.current_rx_match_ratio = (can_stats.matches_delta * 100) / can_stats.rx_frames_delta; can_stats.current_tx_rate = calc_rate(0, HZ, can_stats.tx_frames_delta); can_stats.current_rx_rate = calc_rate(0, HZ, can_stats.rx_frames_delta); /* check / update maximum values */ if (can_stats.max_tx_rate < can_stats.current_tx_rate) can_stats.max_tx_rate = can_stats.current_tx_rate; if (can_stats.max_rx_rate < can_stats.current_rx_rate) can_stats.max_rx_rate = can_stats.current_rx_rate; if (can_stats.max_rx_match_ratio < can_stats.current_rx_match_ratio) can_stats.max_rx_match_ratio = can_stats.current_rx_match_ratio; /* clear values for 'current rate' calculation */ can_stats.tx_frames_delta = 0; can_stats.rx_frames_delta = 0; can_stats.matches_delta = 0; /* restart timer (one second) */ mod_timer(&can_stattimer, round_jiffies(jiffies + HZ)); }

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/* * proc read functions */
static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list, struct net_device *dev) { struct receiver *r; hlist_for_each_entry_rcu(r, rx_list, list) { char *fmt = (r->can_id & CAN_EFF_FLAG)? " %-5s %08x %08x %pK %pK %8ld %s\n" : " %-5s %03x %08x %pK %pK %8ld %s\n"; seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask, r->func, r->data, r->matches, r->ident); } }

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static void can_print_recv_banner(struct seq_file *m) { /* * can1. 00000000 00000000 00000000 * ....... 0 tp20 */ seq_puts(m, " device can_id can_mask function" " userdata matches ident\n"); }

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static int can_stats_proc_show(struct seq_file *m, void *v) { seq_putc(m, '\n'); seq_printf(m, " %8ld transmitted frames (TXF)\n", can_stats.tx_frames); seq_printf(m, " %8ld received frames (RXF)\n", can_stats.rx_frames); seq_printf(m, " %8ld matched frames (RXMF)\n", can_stats.matches); seq_putc(m, '\n'); if (can_stattimer.function == can_stat_update) { seq_printf(m, " %8ld %% total match ratio (RXMR)\n", can_stats.total_rx_match_ratio); seq_printf(m, " %8ld frames/s total tx rate (TXR)\n", can_stats.total_tx_rate); seq_printf(m, " %8ld frames/s total rx rate (RXR)\n", can_stats.total_rx_rate); seq_putc(m, '\n'); seq_printf(m, " %8ld %% current match ratio (CRXMR)\n", can_stats.current_rx_match_ratio); seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n", can_stats.current_tx_rate); seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n", can_stats.current_rx_rate); seq_putc(m, '\n'); seq_printf(m, " %8ld %% max match ratio (MRXMR)\n", can_stats.max_rx_match_ratio); seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n", can_stats.max_tx_rate); seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n", can_stats.max_rx_rate); seq_putc(m, '\n'); } seq_printf(m, " %8ld current receive list entries (CRCV)\n", can_pstats.rcv_entries); seq_printf(m, " %8ld maximum receive list entries (MRCV)\n", can_pstats.rcv_entries_max); if (can_pstats.stats_reset) seq_printf(m, "\n %8ld statistic resets (STR)\n", can_pstats.stats_reset); if (can_pstats.user_reset) seq_printf(m, " %8ld user statistic resets (USTR)\n", can_pstats.user_reset); seq_putc(m, '\n'); return 0; }

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static int can_stats_proc_open(struct inode *inode, struct file *file) { return single_open(file, can_stats_proc_show, NULL); }

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static const struct file_operations can_stats_proc_fops = { .owner = THIS_MODULE, .open = can_stats_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, };
static int can_reset_stats_proc_show(struct seq_file *m, void *v) { user_reset = 1; if (can_stattimer.function == can_stat_update) { seq_printf(m, "Scheduled statistic reset #%ld.\n", can_pstats.stats_reset + 1); } else { if (can_stats.jiffies_init != jiffies) can_init_stats(); seq_printf(m, "Performed statistic reset #%ld.\n", can_pstats.stats_reset); } return 0; }

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static int can_reset_stats_proc_open(struct inode *inode, struct file *file) { return single_open(file, can_reset_stats_proc_show, NULL); }

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static const struct file_operations can_reset_stats_proc_fops = { .owner = THIS_MODULE, .open = can_reset_stats_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, };
static int can_version_proc_show(struct seq_file *m, void *v) { seq_printf(m, "%s\n", CAN_VERSION_STRING); return 0; }

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static int can_version_proc_open(struct inode *inode, struct file *file) { return single_open(file, can_version_proc_show, NULL); }

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static const struct file_operations can_version_proc_fops = { .owner = THIS_MODULE, .open = can_version_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, };
static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx, struct net_device *dev, struct dev_rcv_lists *d) { if (!hlist_empty(&d->rx[idx])) { can_print_recv_banner(m); can_print_rcvlist(m, &d->rx[idx], dev); } else seq_printf(m, " (%s: no entry)\n", DNAME(dev)); }

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static int can_rcvlist_proc_show(struct seq_file *m, void *v) { /* double cast to prevent GCC warning */ int idx = (int)(long)m->private; struct net_device *dev; struct dev_rcv_lists *d; seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]); rcu_read_lock(); /* receive list for 'all' CAN devices (dev == NULL) */ d = &can_rx_alldev_list; can_rcvlist_proc_show_one(m, idx, NULL, d); /* receive list for registered CAN devices */ for_each_netdev_rcu(&init_net, dev) { if (dev->type == ARPHRD_CAN && dev->ml_priv) can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv); } rcu_read_unlock(); seq_putc(m, '\n'); return 0; }

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static int can_rcvlist_proc_open(struct inode *inode, struct file *file) { return single_open(file, can_rcvlist_proc_show, PDE_DATA(inode)); }

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static const struct file_operations can_rcvlist_proc_fops = { .owner = THIS_MODULE, .open = can_rcvlist_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, };
static inline void can_rcvlist_proc_show_array(struct seq_file *m, struct net_device *dev, struct hlist_head *rcv_array, unsigned int rcv_array_sz) { unsigned int i; int all_empty = 1; /* check whether at least one list is non-empty */ for (i = 0; i < rcv_array_sz; i++) if (!hlist_empty(&rcv_array[i])) { all_empty = 0; break; } if (!all_empty) { can_print_recv_banner(m); for (i = 0; i < rcv_array_sz; i++) { if (!hlist_empty(&rcv_array[i])) can_print_rcvlist(m, &rcv_array[i], dev); } } else seq_printf(m, " (%s: no entry)\n", DNAME(dev)); }

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static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v) { struct net_device *dev; struct dev_rcv_lists *d; /* RX_SFF */ seq_puts(m, "\nreceive list 'rx_sff':\n"); rcu_read_lock(); /* sff receive list for 'all' CAN devices (dev == NULL) */ d = &can_rx_alldev_list; can_rcvlist_proc_show_array(m, NULL, d->rx_sff, ARRAY_SIZE(d->rx_sff)); /* sff receive list for registered CAN devices */ for_each_netdev_rcu(&init_net, dev) { if (dev->type == ARPHRD_CAN && dev->ml_priv) { d = dev->ml_priv; can_rcvlist_proc_show_array(m, dev, d->rx_sff, ARRAY_SIZE(d->rx_sff)); } } rcu_read_unlock(); seq_putc(m, '\n'); return 0; }

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static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file) { return single_open(file, can_rcvlist_sff_proc_show, NULL); }

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static const struct file_operations can_rcvlist_sff_proc_fops = { .owner = THIS_MODULE, .open = can_rcvlist_sff_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, };
static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v) { struct net_device *dev; struct dev_rcv_lists *d; /* RX_EFF */ seq_puts(m, "\nreceive list 'rx_eff':\n"); rcu_read_lock(); /* eff receive list for 'all' CAN devices (dev == NULL) */ d = &can_rx_alldev_list; can_rcvlist_proc_show_array(m, NULL, d->rx_eff, ARRAY_SIZE(d->rx_eff)); /* eff receive list for registered CAN devices */ for_each_netdev_rcu(&init_net, dev) { if (dev->type == ARPHRD_CAN && dev->ml_priv) { d = dev->ml_priv; can_rcvlist_proc_show_array(m, dev, d->rx_eff, ARRAY_SIZE(d->rx_eff)); } } rcu_read_unlock(); seq_putc(m, '\n'); return 0; }

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static int can_rcvlist_eff_proc_open(struct inode *inode, struct file *file) { return single_open(file, can_rcvlist_eff_proc_show, NULL); }

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static const struct file_operations can_rcvlist_eff_proc_fops = { .owner = THIS_MODULE, .open = can_rcvlist_eff_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; /* * proc utility functions */
static void can_remove_proc_readentry(const char *name) { if (can_dir) remove_proc_entry(name, can_dir); }

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/* * can_init_proc - create main CAN proc directory and procfs entries */
void can_init_proc(void) { /* create /proc/net/can directory */ can_dir = proc_mkdir("can", init_net.proc_net); if (!can_dir) { pr_info("can: failed to create /proc/net/can.\n"); return; } /* own procfs entries from the AF_CAN core */ pde_version = proc_create(CAN_PROC_VERSION, 0644, can_dir, &can_version_proc_fops); pde_stats = proc_create(CAN_PROC_STATS, 0644, can_dir, &can_stats_proc_fops); pde_reset_stats = proc_create(CAN_PROC_RESET_STATS, 0644, can_dir, &can_reset_stats_proc_fops); pde_rcvlist_err = proc_create_data(CAN_PROC_RCVLIST_ERR, 0644, can_dir, &can_rcvlist_proc_fops, (void *)RX_ERR); pde_rcvlist_all = proc_create_data(CAN_PROC_RCVLIST_ALL, 0644, can_dir, &can_rcvlist_proc_fops, (void *)RX_ALL); pde_rcvlist_fil = proc_create_data(CAN_PROC_RCVLIST_FIL, 0644, can_dir, &can_rcvlist_proc_fops, (void *)RX_FIL); pde_rcvlist_inv = proc_create_data(CAN_PROC_RCVLIST_INV, 0644, can_dir, &can_rcvlist_proc_fops, (void *)RX_INV); pde_rcvlist_eff = proc_create(CAN_PROC_RCVLIST_EFF, 0644, can_dir, &can_rcvlist_eff_proc_fops); pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir, &can_rcvlist_sff_proc_fops); }

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Total183100.00%4100.00%

/* * can_remove_proc - remove procfs entries and main CAN proc directory */
void can_remove_proc(void) { if (pde_version) can_remove_proc_readentry(CAN_PROC_VERSION); if (pde_stats) can_remove_proc_readentry(CAN_PROC_STATS); if (pde_reset_stats) can_remove_proc_readentry(CAN_PROC_RESET_STATS); if (pde_rcvlist_err) can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR); if (pde_rcvlist_all) can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL); if (pde_rcvlist_fil) can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL); if (pde_rcvlist_inv) can_remove_proc_readentry(CAN_PROC_RCVLIST_INV); if (pde_rcvlist_eff) can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF); if (pde_rcvlist_sff) can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF); if (can_dir) remove_proc_entry("can", init_net.proc_net); }

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alexander aringalexander aring20.09%19.09%
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Directory: net/can
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