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-rw-r--r--net/can/proc.c538
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diff --git a/net/can/proc.c b/net/can/proc.c
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+++ b/net/can/proc.c
@@ -0,0 +1,538 @@
+/*
+ * 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",
+ [RX_EFF] = "rx_eff",
+};
+
+/* receive filters subscribed for 'all' CAN devices */
+extern struct dev_rcv_lists can_rx_alldev_list;
+
+/*
+ * 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
+ */
+
+static void can_print_rcvlist(struct seq_file *m, 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 %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);
+ }
+}
+
+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");
+}
+
+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;
+}
+
+static int can_stats_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, can_stats_proc_show, NULL);
+}
+
+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;
+}
+
+static int can_reset_stats_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, can_reset_stats_proc_show, NULL);
+}
+
+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;
+}
+
+static int can_version_proc_open(struct inode *inode, struct file *file)
+{
+ 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,
+};
+
+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));
+
+}
+
+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;
+}
+
+static int can_rcvlist_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, can_rcvlist_proc_show, PDE(inode)->data);
+}
+
+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_sff_proc_show_one(struct seq_file *m,
+ struct net_device *dev,
+ struct dev_rcv_lists *d)
+{
+ int i;
+ int 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], dev);
+ }
+ } else
+ seq_printf(m, " (%s: no entry)\n", DNAME(dev));
+}
+
+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_sff_proc_show_one(m, NULL, d);
+
+ /* sff receive list for registered CAN devices */
+ for_each_netdev_rcu(&init_net, dev) {
+ if (dev->type == ARPHRD_CAN && dev->ml_priv)
+ can_rcvlist_sff_proc_show_one(m, dev, dev->ml_priv);
+ }
+
+ rcu_read_unlock();
+
+ seq_putc(m, '\n');
+ return 0;
+}
+
+static int can_rcvlist_sff_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, can_rcvlist_sff_proc_show, NULL);
+}
+
+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,
+};
+
+/*
+ * proc utility functions
+ */
+
+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 = 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);
+}
+
+/*
+ * 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");
+}
generated by cgit (git 2.34.1) at 2024-12-20 11:40:29 +0000