/*
- * af_can_proc.c
+ * proc.c - procfs support for Protocol family CAN core module
*
- * Copyright (c) 2002-2005 Volkswagen Group Electronic Research
+ * 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, the following disclaimer and
- * the referenced file 'COPYING'.
+ * 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.
*
* 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 as distributed in the 'COPYING'
- * file from the main directory of the linux kernel source.
+ * 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.
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
- * Send feedback to <llcf@volkswagen.de>
+ * Send feedback to <socketcan-users@lists.berlios.de>
*
*/
#include <linux/module.h>
+#include <linux/version.h>
#include <linux/proc_fs.h>
+#include <linux/list.h>
+#include <linux/rcupdate.h>
+#include <socketcan/can/core.h>
-#include <linux/can/af_can.h>
-
-#include "version.h"
+#include "af_can.h"
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
+#include "compat.h"
+#endif
+#include <socketcan/can/version.h> /* for RCSID. Removed by mkpatch script */
RCSID("$Id$");
-/* proc filenames */
+/*
+ * proc filenames for the PF_CAN core
+ */
#define CAN_PROC_VERSION "version"
#define CAN_PROC_STATS "stats"
#define CAN_PROC_RCVLIST_EFF "rcvlist_eff"
#define CAN_PROC_RCVLIST_ERR "rcvlist_err"
-static void can_init_stats(int caller);
-static void can_stat_update(unsigned long data);
-
-static struct proc_dir_entry *can_create_proc_read_entry(const char *name, mode_t mode, read_proc_t* read_proc, void *data);
-static void can_remove_proc_entry(const char *name);
-static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif, unsigned long count);
-
-static int can_proc_read_version(char *page, char **start, off_t off, int count, int *eof, void *data);
-static int can_proc_read_stats(char *page, char **start, off_t off, int count, int *eof, void *data);
-static int can_proc_read_reset_stats(char *page, char **start, off_t off, int count, int *eof, void *data);
-static int can_proc_read_rcvlist_all(char *page, char **start, off_t off, int count, int *eof, void *data);
-static int can_proc_read_rcvlist_fil(char *page, char **start, off_t off, int count, int *eof, void *data);
-static int can_proc_read_rcvlist_inv(char *page, char **start, off_t off, int count, int *eof, void *data);
-static int can_proc_read_rcvlist_sff(char *page, char **start, off_t off, int count, int *eof, void *data);
-static int can_proc_read_rcvlist_eff(char *page, char **start, off_t off, int count, int *eof, void *data);
-static int can_proc_read_rcvlist_err(char *page, char **start, off_t off, int count, int *eof, void *data);
-
-static struct proc_dir_entry *can_dir = NULL;
-static struct proc_dir_entry *pde_version = NULL;
-static struct proc_dir_entry *pde_stats = NULL;
-static struct proc_dir_entry *pde_reset_stats = NULL;
-static struct proc_dir_entry *pde_rcvlist_all = NULL;
-static struct proc_dir_entry *pde_rcvlist_fil = NULL;
-static struct proc_dir_entry *pde_rcvlist_inv = NULL;
-static struct proc_dir_entry *pde_rcvlist_sff = NULL;
-static struct proc_dir_entry *pde_rcvlist_eff = NULL;
-static struct proc_dir_entry *pde_rcvlist_err = NULL;
-
-struct timer_list stattimer; /* timer for statistics update */
-
-struct s_stats stats; /* statistics */
-struct s_pstats pstats;
-
-extern struct rcv_dev_list *rx_dev_list; /* rx dispatcher structures */
-extern int stats_timer; /* module parameter. default: on */
-
-/**************************************************/
-/* procfs init / remove */
-/**************************************************/
+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",
+};
-void can_init_proc(void)
+/*
+ * 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++;
+ }
+}
- /* procfs init */
+static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
+ unsigned long count)
+{
+ unsigned long rate;
- /* create /proc/can directory */
- can_dir = proc_mkdir(CAN_PROC_DIR, NULL);
+ if (oldjif == newjif)
+ return 0;
- if (can_dir) {
+ /* 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;
+ }
- can_dir->owner = THIS_MODULE;
+ rate = (count * HZ) / (newjif - oldjif);
- /* own procfs entries from the AF_CAN core */
- pde_version = can_create_proc_read_entry(CAN_PROC_VERSION, 0644, can_proc_read_version, NULL);
- pde_stats = can_create_proc_read_entry(CAN_PROC_STATS, 0644, can_proc_read_stats, NULL);
- pde_reset_stats = can_create_proc_read_entry(CAN_PROC_RESET_STATS, 0644, can_proc_read_reset_stats, NULL);
- pde_rcvlist_all = can_create_proc_read_entry(CAN_PROC_RCVLIST_ALL, 0644, can_proc_read_rcvlist_all, NULL);
- pde_rcvlist_fil = can_create_proc_read_entry(CAN_PROC_RCVLIST_FIL, 0644, can_proc_read_rcvlist_fil, NULL);
- pde_rcvlist_inv = can_create_proc_read_entry(CAN_PROC_RCVLIST_INV, 0644, can_proc_read_rcvlist_inv, NULL);
- pde_rcvlist_sff = can_create_proc_read_entry(CAN_PROC_RCVLIST_SFF, 0644, can_proc_read_rcvlist_sff, NULL);
- pde_rcvlist_eff = can_create_proc_read_entry(CAN_PROC_RCVLIST_EFF, 0644, can_proc_read_rcvlist_eff, NULL);
- pde_rcvlist_err = can_create_proc_read_entry(CAN_PROC_RCVLIST_ERR, 0644, can_proc_read_rcvlist_err, NULL);
-
- if (stats_timer) {
- /* the statistics are updated every second (timer triggered) */
- stattimer.function = can_stat_update;
- stattimer.data = 0;
- stattimer.expires = jiffies + HZ; /* every second */
- add_timer(&stattimer); /* start statistics timer */
- }
- } else
- printk(KERN_INFO "af_can: failed to create CAN_PROC_DIR. CONFIG_PROC_FS missing?\n");
+ return rate;
}
-void can_remove_proc(void)
+void can_stat_update(unsigned long data)
{
- /* procfs remove */
- if (pde_version) {
- can_remove_proc_entry(CAN_PROC_VERSION);
- }
-
- if (pde_stats) {
- can_remove_proc_entry(CAN_PROC_STATS);
- }
-
- if (pde_reset_stats) {
- can_remove_proc_entry(CAN_PROC_RESET_STATS);
- }
-
- if (pde_rcvlist_all) {
- can_remove_proc_entry(CAN_PROC_RCVLIST_ALL);
- }
-
- if (pde_rcvlist_fil) {
- can_remove_proc_entry(CAN_PROC_RCVLIST_FIL);
- }
-
- if (pde_rcvlist_inv) {
- can_remove_proc_entry(CAN_PROC_RCVLIST_INV);
- }
-
- if (pde_rcvlist_sff) {
- can_remove_proc_entry(CAN_PROC_RCVLIST_SFF);
- }
-
- if (pde_rcvlist_eff) {
- can_remove_proc_entry(CAN_PROC_RCVLIST_EFF);
- }
-
- if (pde_rcvlist_err) {
- can_remove_proc_entry(CAN_PROC_RCVLIST_ERR);
- }
-
- if (can_dir) {
- remove_proc_entry(CAN_PROC_DIR, NULL);
- }
+ 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 */
-/**************************************************/
+/*
+ * 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.
+ *
+ */
-int can_print_recv_list(char *page, int len, struct rcv_list *rx_list, struct net_device *dev)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
+static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
+ struct net_device *dev)
{
- struct rcv_list *p;
-
- if (rx_list) {
- for (p = rx_list; p; p = p->next) {
-
- /* can1. 00000000 00000000 00000000 .......0 tp20 */
- if (p->can_id & CAN_EFF_FLAG) /* EFF & CAN_ID_ALL */
- len += snprintf(page + len, PAGE_SIZE - len, " %-5s %08X %08x %08x %08x %8ld %s\n",
- dev->name, p->can_id, p->mask, (unsigned int)p->func,
- (unsigned int)p->data, p->matches, p->ident);
- else
- len += snprintf(page + len, PAGE_SIZE - len, " %-5s %03X %08x %08x %08x %8ld %s\n",
- dev->name, p->can_id, p->mask, (unsigned int)p->func,
- (unsigned int)p->data, p->matches, p->ident);
-
- /* does a typical line fit into the current buffer? */
- if (len > PAGE_SIZE - 100) { /* 100 Bytes before end of buffer */
- len += snprintf(page + len, PAGE_SIZE - len, " (..)\n"); /* mark output cutted off */
- return len;
- }
+ struct receiver *r;
+ struct hlist_node *n;
+
+ hlist_for_each_entry_rcu(r, n, rx_list, list) {
+ char *fmt = (r->can_id & CAN_EFF_FLAG)?
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,0,0)
+ " %-5s %08x %08x %p %p %8ld %s\n" :
+ " %-5s %03x %08x %p %p %8ld %s\n";
+#else
+ " %-5s %08x %08x %pK %pK %8ld %s\n" :
+ " %-5s %03x %08x %pK %pK %8ld %s\n";
+#endif
+
+ seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask,
+ r->func, r->data, r->matches, r->ident);
}
- }
-
- return len;
}
-static int can_print_recv_banner(char *page, int len)
+static void can_print_recv_banner(struct seq_file *m)
{
- /* 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;
+ /*
+ * can1. 00000000 00000000 00000000
+ * ....... 0 tp20
+ */
+ seq_puts(m, " device can_id can_mask function"
+ " userdata matches ident\n");
}
-int can_proc_read_stats(char *page, char **start, off_t off, int count, int *eof, void *data)
+static int can_stats_proc_show(struct seq_file *m, void *v)
{
- int len = 0;
+ 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);
- len += snprintf(page + len, PAGE_SIZE - len, "\n");
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld transmitted frames (TXF)\n",
- stats.tx_frames);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld received frames (RXF)\n",
- stats.rx_frames);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld matched frames (RXMF)\n",
- stats.matches);
+ seq_putc(m, '\n');
- len += snprintf(page + len, PAGE_SIZE - len, "\n");
+ if (can_stattimer.function == can_stat_update) {
+ seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
+ can_stats.total_rx_match_ratio);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld %% total match ratio (RXMR)\n",
- 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);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld frames/s total tx rate (TXR)\n",
- stats.total_tx_rate);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld frames/s total rx rate (RXR)\n",
- stats.total_rx_rate);
+ seq_putc(m, '\n');
- len += snprintf(page + len, PAGE_SIZE - len, "\n");
+ seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
+ can_stats.current_rx_match_ratio);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld %% current match ratio (CRXMR)\n",
- 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);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld frames/s current tx rate (CTXR)\n",
- stats.current_tx_rate);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld frames/s current rx rate (CRXR)\n",
- stats.current_rx_rate);
+ seq_putc(m, '\n');
- len += snprintf(page + len, PAGE_SIZE - len, "\n");
+ seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
+ can_stats.max_rx_match_ratio);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld %% max match ratio (MRXMR)\n",
- 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);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld frames/s max tx rate (MTXR)\n",
- stats.max_tx_rate);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld frames/s max rx rate (MRXR)\n",
- stats.max_rx_rate);
+ seq_putc(m, '\n');
+ }
- len += snprintf(page + len, PAGE_SIZE - len, "\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);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld current receive list entries (CRCV)\n", pstats.rcv_entries);
- len += snprintf(page + len, PAGE_SIZE - len, " %8ld maximum receive list entries (MRCV)\n", pstats.rcv_entries_max);
+ if (can_pstats.stats_reset)
+ seq_printf(m, "\n %8ld statistic resets (STR)\n",
+ can_pstats.stats_reset);
- if (pstats.stats_reset)
- len += snprintf(page + len, PAGE_SIZE - len, "\n %8ld statistic resets (STR)\n", pstats.stats_reset);
+ if (can_pstats.user_reset)
+ seq_printf(m, " %8ld user statistic resets (USTR)\n",
+ can_pstats.user_reset);
- len += snprintf(page + len, PAGE_SIZE - len, "\n");
+ seq_putc(m, '\n');
+ return 0;
+}
- *eof = 1;
- return len;
+static int can_stats_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, can_stats_proc_show, NULL);
}
-int can_proc_read_reset_stats(char *page, char **start, off_t off, int count, int *eof, void *data)
+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)
{
- int len = 0;
+ user_reset = 1;
- can_init_stats(1);
+ if (can_stattimer.function == can_stat_update) {
+ seq_printf(m, "Scheduled statistic reset #%ld.\n",
+ can_pstats.stats_reset + 1);
- len += snprintf(page + len, PAGE_SIZE - len, "CAN statistic reset #%ld done.\n", pstats.stats_reset);
+ } else {
+ if (can_stats.jiffies_init != jiffies)
+ can_init_stats();
- *eof = 1;
- return len;
+ seq_printf(m, "Performed statistic reset #%ld.\n",
+ can_pstats.stats_reset);
+ }
+ return 0;
}
-int can_proc_read_version(char *page, char **start, off_t off, int count, int *eof, void *data)
+static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
{
- int len = 0;
+ return single_open(file, can_reset_stats_proc_show, NULL);
+}
- len += snprintf(page + len, PAGE_SIZE - len,
- "%06X [ Volkswagen AG - Low Level CAN Framework (LLCF) v%s ]\n",
- LLCF_VERSION_CODE, VERSION);
+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,
+};
- *eof = 1;
- return len;
+static int can_version_proc_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "%s\n", CAN_VERSION_STRING);
+ return 0;
}
-int can_proc_read_rcvlist_all(char *page, char **start, off_t off, int count, int *eof, void *data)
+static int can_version_proc_open(struct inode *inode, struct file *file)
{
- int len = 0;
- struct rcv_dev_list *p;
+ return single_open(file, can_version_proc_show, NULL);
+}
+
+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,
+};
- /* RX_ALL */
- len += snprintf(page + len, PAGE_SIZE - len, "\nreceive list 'rx_all':\n");
+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 dev_rcv_lists *d;
+ struct hlist_node *n;
- /* find receive list for this device */
- for (p = rx_dev_list; p; p = p->next) {
+ seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
- if (p->rx_all) {
- len = can_print_recv_banner(page, len);
- len = can_print_recv_list(page, len, p->rx_all, p->dev);
- } else
- if (p->dev)
- len += snprintf(page + len, PAGE_SIZE - len, " (%s: no entry)\n", p->dev->name);
- }
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
- len += snprintf(page + len, PAGE_SIZE - len, "\n");
+ if (!hlist_empty(&d->rx[idx])) {
+ can_print_recv_banner(m);
+ can_print_rcvlist(m, &d->rx[idx], d->dev);
+ } else
+ seq_printf(m, " (%s: no entry)\n", DNAME(d->dev));
+ }
+ rcu_read_unlock();
- *eof = 1;
- return len;
+ seq_putc(m, '\n');
+ return 0;
}
-int can_proc_read_rcvlist_fil(char *page, char **start, off_t off, int count, int *eof, void *data)
+static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
{
- int len = 0;
- struct rcv_dev_list *p;
-
- /* RX_FIL */
- len += snprintf(page + len, PAGE_SIZE - len, "\nreceive list 'rx_fil':\n");
-
- /* find receive list for this device */
- for (p = rx_dev_list; p; p = p->next) {
+ return single_open(file, can_rcvlist_proc_show, PDE(inode)->data);
+}
- if (p->rx_fil) {
- len = can_print_recv_banner(page, len);
- len = can_print_recv_list(page, len, p->rx_fil, p->dev);
- } else
- if (p->dev)
- len += snprintf(page + len, PAGE_SIZE - len, " (%s: no entry)\n", p->dev->name);
- }
+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,
+};
- len += snprintf(page + len, PAGE_SIZE - len, "\n");
+static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
+{
+ struct dev_rcv_lists *d;
+ struct hlist_node *n;
+
+ /* RX_SFF */
+ seq_puts(m, "\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) {
+ can_print_recv_banner(m);
+ for (i = 0; i < 0x800; i++) {
+ if (!hlist_empty(&d->rx_sff[i]))
+ can_print_rcvlist(m, &d->rx_sff[i],
+ d->dev);
+ }
+ } else
+ seq_printf(m, " (%s: no entry)\n", DNAME(d->dev));
+ }
+ rcu_read_unlock();
- *eof = 1;
- return len;
+ seq_putc(m, '\n');
+ return 0;
}
-int can_proc_read_rcvlist_inv(char *page, char **start, off_t off, int count, int *eof, void *data)
+static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
{
- int len = 0;
- struct rcv_dev_list *p;
-
- /* RX_INV */
- len += snprintf(page + len, PAGE_SIZE - len, "\nreceive list 'rx_inv':\n");
-
- /* find receive list for this device */
- for (p = rx_dev_list; p; p = p->next) {
-
- if (p->rx_inv) {
- len = can_print_recv_banner(page, len);
- len = can_print_recv_list(page, len, p->rx_inv, p->dev);
- } else
- if (p->dev)
- len += snprintf(page + len, PAGE_SIZE - len, " (%s: no entry)\n", p->dev->name);
- }
+ return single_open(file, can_rcvlist_sff_proc_show, NULL);
+}
- len += snprintf(page + len, PAGE_SIZE - len, "\n");
+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,
+};
+#else
+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;
+
+ 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;
+ }
+ }
- *eof = 1;
- return len;
+ return len;
}
-int can_proc_read_rcvlist_sff(char *page, char **start, off_t off, int count, int *eof, void *data)
+static int can_print_recv_banner(char *page, int len)
{
- int len = 0;
- unsigned long id = 0;
- int i;
- struct rcv_dev_list *p;
-
- /* RX_SFF */
- len += snprintf(page + len, PAGE_SIZE - len, "\nreceive list 'rx_sff':\n");
-
- /* find receive list for this device */
- for (p = rx_dev_list; p; p = p->next) {
-
- for(i=0; i<0x800; i++)
- id |= (unsigned long) p->rx_sff[i]; /* check if any entry available */
-
- if (id) {
- len = can_print_recv_banner(page, len);
- for(i=0; i<0x800; i++) {
- if ((p->rx_sff[i]) && (len < PAGE_SIZE - 100))
- len = can_print_recv_list(page, len, p->rx_sff[i], p->dev);
- }
- } else
- if (p->dev)
- len += snprintf(page + len, PAGE_SIZE - len, " (%s: no entry)\n", p->dev->name);
- }
-
- len += snprintf(page + len, PAGE_SIZE - len, "\n");
-
- *eof = 1;
- return 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;
}
-int can_proc_read_rcvlist_eff(char *page, char **start, off_t off, int count, int *eof, void *data)
+static int can_proc_read_stats(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
{
- int len = 0;
- struct rcv_dev_list *p;
+ 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");
+ }
- /* RX_EFF */
- len += snprintf(page + len, PAGE_SIZE - len, "\nreceive list 'rx_eff':\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);
- /* find receive list for this device */
- for (p = rx_dev_list; p; p = p->next) {
+ if (can_pstats.stats_reset)
+ len += snprintf(page + len, PAGE_SIZE - len,
+ "\n %8ld statistic resets (STR)\n",
+ can_pstats.stats_reset);
- if (p->rx_eff) {
- len = can_print_recv_banner(page, len);
- len = can_print_recv_list(page, len, p->rx_eff, p->dev);
- } else
- if (p->dev)
- len += snprintf(page + len, PAGE_SIZE - len, " (%s: no entry)\n", p->dev->name);
- }
+ 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");
+ len += snprintf(page + len, PAGE_SIZE - len, "\n");
- *eof = 1;
- return len;
+ *eof = 1;
+ return len;
}
-int can_proc_read_rcvlist_err(char *page, char **start, off_t off, int count, int *eof, void *data)
+static int can_proc_read_reset_stats(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
{
- int len = 0;
- struct rcv_dev_list *p;
+ int len = 0;
- /* RX_ERR */
- len += snprintf(page + len, PAGE_SIZE - len, "\nreceive list 'rx_err':\n");
+ user_reset = 1;
- /* find receive list for this device */
- for (p = rx_dev_list; p; p = p->next) {
+ if (can_stattimer.function == can_stat_update) {
+ len += snprintf(page + len, PAGE_SIZE - len,
+ "Scheduled statistic reset #%ld.\n",
+ can_pstats.stats_reset + 1);
- if (p->rx_err) {
- len = can_print_recv_banner(page, len);
- len = can_print_recv_list(page, len, p->rx_err, p->dev);
- } else
- if (p->dev)
- len += snprintf(page + len, PAGE_SIZE - len, " (%s: no entry)\n", p->dev->name);
- }
+ } else {
+ if (can_stats.jiffies_init != jiffies)
+ can_init_stats();
- len += snprintf(page + len, PAGE_SIZE - len, "\n");
+ len += snprintf(page + len, PAGE_SIZE - len,
+ "Performed statistic reset #%ld.\n",
+ can_pstats.stats_reset);
+ }
- *eof = 1;
- return len;
+ *eof = 1;
+ return len;
}
-/**************************************************/
-/* proc utility functions */
-/**************************************************/
-
-static struct proc_dir_entry *can_create_proc_read_entry(const char *name, mode_t mode, read_proc_t* read_proc, void *data)
+static int can_proc_read_version(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
{
- if (can_dir)
- return create_proc_read_entry(name, mode, can_dir, read_proc, data);
- else
- return NULL;
-}
+ int len = 0;
-static void can_remove_proc_entry(const char *name)
-{
- if (can_dir)
- remove_proc_entry(name, can_dir);
+ len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
+ CAN_VERSION_STRING);
+ *eof = 1;
+ return len;
}
-static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif, unsigned long count){
-
- unsigned long ret = 0;
-
- if (oldjif == newjif)
- return 0;
-
- if (count > (ULONG_MAX / HZ)) { /* see can_rcv() - this should NEVER happen! */
- printk(KERN_ERR "af_can: calc_rate: count exceeded! %ld\n", count);
- return 99999999;
- }
+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();
- ret = ((count * HZ) / (newjif - oldjif));
+ len += snprintf(page + len, PAGE_SIZE - len, "\n");
- return ret;
-};
+ *eof = 1;
+ return len;
+}
-/**************************************************/
-/* af_can statistics stuff */
-/**************************************************/
+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();
-static void can_init_stats(int caller){
+ len += snprintf(page + len, PAGE_SIZE - len, "\n");
- memset(&stats, 0, sizeof(stats));
- stats.jiffies_init = jiffies;
- pstats.stats_reset++;
-};
+ *eof = 1;
+ return len;
+}
+#endif
-static void can_stat_update(unsigned long data){
+/*
+ * proc utility functions
+ */
- unsigned long j = jiffies; /* snapshot */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
+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;
+}
+#endif
- //DBG("af_can: can_stat_update() jiffies = %ld\n", j);
+static void can_remove_proc_readentry(const char *name)
+{
+ if (can_dir)
+ remove_proc_entry(name, can_dir);
+}
- if (j < stats.jiffies_init) /* jiffies overflow */
- can_init_stats(2);
+/*
+ * can_init_proc - create main CAN proc directory and procfs entries
+ */
+void can_init_proc(void)
+{
+ /* create /proc/net/can directory */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
+ can_dir = proc_mkdir("can", init_net.proc_net);
+#else
+ can_dir = proc_mkdir("can", proc_net);
+#endif
+
+ if (!can_dir) {
+ printk(KERN_INFO "can: failed to create /proc/net/can . "
+ "CONFIG_PROC_FS missing?\n");
+ return;
+ }
- /* stats.rx_frames is the definitively max. statistic value */
- if (stats.rx_frames > (ULONG_MAX / HZ)) /* prevent overflow in calc_rate() */
- can_init_stats(3); /* restart */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30)
+ can_dir->owner = THIS_MODULE;
+#endif
- if (stats.matches > (ULONG_MAX / 100)) /* matches overflow - very improbable */
- can_init_stats(4);
+ /* own procfs entries from the AF_CAN core */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
+ 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_data(CAN_PROC_RCVLIST_EFF, 0644, can_dir,
+ &can_rcvlist_proc_fops, (void *)RX_EFF);
+ pde_rcvlist_sff = proc_create(CAN_PROC_RCVLIST_SFF, 0644, can_dir,
+ &can_rcvlist_sff_proc_fops);
+#else
+ 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);
+#endif
+}
- /* calc total values */
- if (stats.rx_frames)
- stats.total_rx_match_ratio = (stats.matches * 100) / stats.rx_frames;
+/*
+ * 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);
- stats.total_tx_rate = calc_rate(stats.jiffies_init, j, stats.tx_frames);
- stats.total_rx_rate = calc_rate(stats.jiffies_init, j, stats.rx_frames);
+ if (pde_stats)
+ can_remove_proc_readentry(CAN_PROC_STATS);
- /* calc current values */
- if (stats.rx_frames_delta)
- stats.current_rx_match_ratio = (stats.matches_delta * 100) / stats.rx_frames_delta;
+ if (pde_reset_stats)
+ can_remove_proc_readentry(CAN_PROC_RESET_STATS);
- stats.current_tx_rate = calc_rate(0, HZ, stats.tx_frames_delta);
- stats.current_rx_rate = calc_rate(0, HZ, stats.rx_frames_delta);
+ if (pde_rcvlist_err)
+ can_remove_proc_readentry(CAN_PROC_RCVLIST_ERR);
- /* check / update maximum values */
- if (stats.max_tx_rate < stats.current_tx_rate)
- stats.max_tx_rate = stats.current_tx_rate;
+ if (pde_rcvlist_all)
+ can_remove_proc_readentry(CAN_PROC_RCVLIST_ALL);
- if (stats.max_rx_rate < stats.current_rx_rate)
- stats.max_rx_rate = stats.current_rx_rate;
+ if (pde_rcvlist_fil)
+ can_remove_proc_readentry(CAN_PROC_RCVLIST_FIL);
- if (stats.max_rx_match_ratio < stats.current_rx_match_ratio)
- stats.max_rx_match_ratio = stats.current_rx_match_ratio;
+ if (pde_rcvlist_inv)
+ can_remove_proc_readentry(CAN_PROC_RCVLIST_INV);
- /* clear values for 'current rate' calculation */
- stats.tx_frames_delta = 0;
- stats.rx_frames_delta = 0;
- stats.matches_delta = 0;
+ if (pde_rcvlist_eff)
+ can_remove_proc_readentry(CAN_PROC_RCVLIST_EFF);
- /* restart timer */
- stattimer.expires = jiffies + HZ; /* every second */
- add_timer(&stattimer);
-};
+ if (pde_rcvlist_sff)
+ can_remove_proc_readentry(CAN_PROC_RCVLIST_SFF);
-/**************************************************/
-/* EOF */
-/**************************************************/
+ if (can_dir)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
+ proc_net_remove(&init_net, "can");
+#else
+ proc_net_remove("can");
+#endif
+}
projects / socketcan-devel.git / blobdiff