532 lines
15 KiB
C
532 lines
15 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Send feedback to <socketcan-users@lists.berlios.de>
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/list.h>
|
|
#include <linux/rcupdate.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",
|
|
[RX_EFF] = "rx_eff",
|
|
};
|
|
|
|
/*
|
|
* 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++;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
/*
|
|
* proc read functions
|
|
*
|
|
* From known use-cases we expect about 10 entries in a receive list to be
|
|
* printed in the proc_fs. So PAGE_SIZE is definitely enough space here.
|
|
*
|
|
*/
|
|
|
|
static int can_print_rcvlist(char *page, int len, struct hlist_head *rx_list,
|
|
struct net_device *dev)
|
|
{
|
|
struct receiver *r;
|
|
struct hlist_node *n;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(r, n, rx_list, list) {
|
|
char *fmt = (r->can_id & CAN_EFF_FLAG)?
|
|
" %-5s %08X %08x %08x %08x %8ld %s\n" :
|
|
" %-5s %03X %08x %08lx %08lx %8ld %s\n";
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, fmt,
|
|
DNAME(dev), r->can_id, r->mask,
|
|
(unsigned long)r->func, (unsigned long)r->data,
|
|
r->matches, r->ident);
|
|
|
|
/* does a typical line fit into the current buffer? */
|
|
|
|
/* 100 Bytes before end of buffer */
|
|
if (len > PAGE_SIZE - 100) {
|
|
/* mark output cut off */
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" (..)\n");
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return len;
|
|
}
|
|
|
|
static int can_print_recv_banner(char *page, int len)
|
|
{
|
|
/*
|
|
* can1. 00000000 00000000 00000000
|
|
* ....... 0 tp20
|
|
*/
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" device can_id can_mask function"
|
|
" userdata matches ident\n");
|
|
|
|
return len;
|
|
}
|
|
|
|
static int can_proc_read_stats(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int len = 0;
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, "\n");
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld transmitted frames (TXF)\n",
|
|
can_stats.tx_frames);
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld received frames (RXF)\n", can_stats.rx_frames);
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld matched frames (RXMF)\n", can_stats.matches);
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, "\n");
|
|
|
|
if (can_stattimer.function == can_stat_update) {
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld %% total match ratio (RXMR)\n",
|
|
can_stats.total_rx_match_ratio);
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld frames/s total tx rate (TXR)\n",
|
|
can_stats.total_tx_rate);
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld frames/s total rx rate (RXR)\n",
|
|
can_stats.total_rx_rate);
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, "\n");
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld %% current match ratio (CRXMR)\n",
|
|
can_stats.current_rx_match_ratio);
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld frames/s current tx rate (CTXR)\n",
|
|
can_stats.current_tx_rate);
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld frames/s current rx rate (CRXR)\n",
|
|
can_stats.current_rx_rate);
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, "\n");
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld %% max match ratio (MRXMR)\n",
|
|
can_stats.max_rx_match_ratio);
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld frames/s max tx rate (MTXR)\n",
|
|
can_stats.max_tx_rate);
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld frames/s max rx rate (MRXR)\n",
|
|
can_stats.max_rx_rate);
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, "\n");
|
|
}
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld current receive list entries (CRCV)\n",
|
|
can_pstats.rcv_entries);
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld maximum receive list entries (MRCV)\n",
|
|
can_pstats.rcv_entries_max);
|
|
|
|
if (can_pstats.stats_reset)
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
"\n %8ld statistic resets (STR)\n",
|
|
can_pstats.stats_reset);
|
|
|
|
if (can_pstats.user_reset)
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" %8ld user statistic resets (USTR)\n",
|
|
can_pstats.user_reset);
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, "\n");
|
|
|
|
*eof = 1;
|
|
return len;
|
|
}
|
|
|
|
static int can_proc_read_reset_stats(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int len = 0;
|
|
|
|
user_reset = 1;
|
|
|
|
if (can_stattimer.function == can_stat_update) {
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
"Scheduled statistic reset #%ld.\n",
|
|
can_pstats.stats_reset + 1);
|
|
|
|
} else {
|
|
if (can_stats.jiffies_init != jiffies)
|
|
can_init_stats();
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
"Performed statistic reset #%ld.\n",
|
|
can_pstats.stats_reset);
|
|
}
|
|
|
|
*eof = 1;
|
|
return len;
|
|
}
|
|
|
|
static int can_proc_read_version(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int len = 0;
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
|
|
CAN_VERSION_STRING);
|
|
*eof = 1;
|
|
return len;
|
|
}
|
|
|
|
static int can_proc_read_rcvlist(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
/* double cast to prevent GCC warning */
|
|
int idx = (int)(long)data;
|
|
int len = 0;
|
|
struct dev_rcv_lists *d;
|
|
struct hlist_node *n;
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
"\nreceive list '%s':\n", rx_list_name[idx]);
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
|
|
|
|
if (!hlist_empty(&d->rx[idx])) {
|
|
len = can_print_recv_banner(page, len);
|
|
len = can_print_rcvlist(page, len, &d->rx[idx], d->dev);
|
|
} else
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" (%s: no entry)\n", DNAME(d->dev));
|
|
|
|
/* exit on end of buffer? */
|
|
if (len > PAGE_SIZE - 100)
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, "\n");
|
|
|
|
*eof = 1;
|
|
return len;
|
|
}
|
|
|
|
static int can_proc_read_rcvlist_sff(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int len = 0;
|
|
struct dev_rcv_lists *d;
|
|
struct hlist_node *n;
|
|
|
|
/* RX_SFF */
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
"\nreceive list 'rx_sff':\n");
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
|
|
int i, all_empty = 1;
|
|
/* check wether at least one list is non-empty */
|
|
for (i = 0; i < 0x800; i++)
|
|
if (!hlist_empty(&d->rx_sff[i])) {
|
|
all_empty = 0;
|
|
break;
|
|
}
|
|
|
|
if (!all_empty) {
|
|
len = can_print_recv_banner(page, len);
|
|
for (i = 0; i < 0x800; i++) {
|
|
if (!hlist_empty(&d->rx_sff[i]) &&
|
|
len < PAGE_SIZE - 100)
|
|
len = can_print_rcvlist(page, len,
|
|
&d->rx_sff[i],
|
|
d->dev);
|
|
}
|
|
} else
|
|
len += snprintf(page + len, PAGE_SIZE - len,
|
|
" (%s: no entry)\n", DNAME(d->dev));
|
|
|
|
/* exit on end of buffer? */
|
|
if (len > PAGE_SIZE - 100)
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, "\n");
|
|
|
|
*eof = 1;
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* proc utility functions
|
|
*/
|
|
|
|
static struct proc_dir_entry *can_create_proc_readentry(const char *name,
|
|
mode_t mode,
|
|
read_proc_t *read_proc,
|
|
void *data)
|
|
{
|
|
if (can_dir)
|
|
return create_proc_read_entry(name, mode, can_dir, read_proc,
|
|
data);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
static void can_remove_proc_readentry(const char *name)
|
|
{
|
|
if (can_dir)
|
|
remove_proc_entry(name, can_dir);
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
printk(KERN_INFO "can: failed to create /proc/net/can . "
|
|
"CONFIG_PROC_FS missing?\n");
|
|
return;
|
|
}
|
|
|
|
/* own procfs entries from the AF_CAN core */
|
|
pde_version = can_create_proc_readentry(CAN_PROC_VERSION, 0644,
|
|
can_proc_read_version, NULL);
|
|
pde_stats = can_create_proc_readentry(CAN_PROC_STATS, 0644,
|
|
can_proc_read_stats, NULL);
|
|
pde_reset_stats = can_create_proc_readentry(CAN_PROC_RESET_STATS, 0644,
|
|
can_proc_read_reset_stats, NULL);
|
|
pde_rcvlist_err = can_create_proc_readentry(CAN_PROC_RCVLIST_ERR, 0644,
|
|
can_proc_read_rcvlist, (void *)RX_ERR);
|
|
pde_rcvlist_all = can_create_proc_readentry(CAN_PROC_RCVLIST_ALL, 0644,
|
|
can_proc_read_rcvlist, (void *)RX_ALL);
|
|
pde_rcvlist_fil = can_create_proc_readentry(CAN_PROC_RCVLIST_FIL, 0644,
|
|
can_proc_read_rcvlist, (void *)RX_FIL);
|
|
pde_rcvlist_inv = can_create_proc_readentry(CAN_PROC_RCVLIST_INV, 0644,
|
|
can_proc_read_rcvlist, (void *)RX_INV);
|
|
pde_rcvlist_eff = can_create_proc_readentry(CAN_PROC_RCVLIST_EFF, 0644,
|
|
can_proc_read_rcvlist, (void *)RX_EFF);
|
|
pde_rcvlist_sff = can_create_proc_readentry(CAN_PROC_RCVLIST_SFF, 0644,
|
|
can_proc_read_rcvlist_sff, NULL);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
proc_net_remove(&init_net, "can");
|
|
}
|