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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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/can-ml.h>#include <linux/can/core.h>
#include "af_can.h"
/* * proc filenames for the PF_CAN core */
#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 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(struct net *net){ struct can_pkg_stats *pkg_stats = net->can.pkg_stats; struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; /* * 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(pkg_stats, 0, sizeof(struct can_pkg_stats)); pkg_stats->jiffies_init = jiffies;
rcv_lists_stats->stats_reset++;
if (user_reset) { user_reset = 0; rcv_lists_stats->user_reset++; }}
static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif, unsigned long count){ 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; }
return (count * HZ) / (newjif - oldjif);}
void can_stat_update(struct timer_list *t){ struct net *net = timer_container_of(net, t, can.stattimer); struct can_pkg_stats *pkg_stats = net->can.pkg_stats; unsigned long j = jiffies; /* snapshot */
long rx_frames = atomic_long_read(&pkg_stats->rx_frames); long tx_frames = atomic_long_read(&pkg_stats->tx_frames); long matches = atomic_long_read(&pkg_stats->matches); long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta); long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta); long matches_delta = atomic_long_read(&pkg_stats->matches_delta);
/* restart counting in timer context on user request */ if (user_reset) can_init_stats(net);
/* restart counting on jiffies overflow */ if (j < pkg_stats->jiffies_init) can_init_stats(net);
/* prevent overflow in calc_rate() */ if (rx_frames > (LONG_MAX / HZ)) can_init_stats(net);
/* prevent overflow in calc_rate() */ if (tx_frames > (LONG_MAX / HZ)) can_init_stats(net);
/* matches overflow - very improbable */ if (matches > (LONG_MAX / 100)) can_init_stats(net);
/* calc total values */ if (rx_frames) pkg_stats->total_rx_match_ratio = (matches * 100) / rx_frames;
pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j, tx_frames); pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j, rx_frames);
/* calc current values */ if (rx_frames_delta) pkg_stats->current_rx_match_ratio = (matches_delta * 100) / rx_frames_delta;
pkg_stats->current_tx_rate = calc_rate(0, HZ, tx_frames_delta); pkg_stats->current_rx_rate = calc_rate(0, HZ, rx_frames_delta);
/* check / update maximum values */ if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate) pkg_stats->max_tx_rate = pkg_stats->current_tx_rate;
if (pkg_stats->max_rx_rate < pkg_stats->current_rx_rate) pkg_stats->max_rx_rate = pkg_stats->current_rx_rate;
if (pkg_stats->max_rx_match_ratio < pkg_stats->current_rx_match_ratio) pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio;
/* clear values for 'current rate' calculation */ atomic_long_set(&pkg_stats->tx_frames_delta, 0); atomic_long_set(&pkg_stats->rx_frames_delta, 0); atomic_long_set(&pkg_stats->matches_delta, 0);
/* restart timer (one second) */ mod_timer(&net->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;
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, atomic_long_read(&r->matches), r->ident); }}
static void can_print_recv_banner(struct seq_file *m){ /* * can1. 00000000 00000000 00000000 * ....... 0 tp20 */ if (IS_ENABLED(CONFIG_64BIT)) seq_puts(m, " device can_id can_mask function userdata matches ident\n"); else 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){ struct net *net = m->private; struct can_pkg_stats *pkg_stats = net->can.pkg_stats; struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
seq_putc(m, '\n'); seq_printf(m, " %8ld transmitted frames (TXF)\n", atomic_long_read(&pkg_stats->tx_frames)); seq_printf(m, " %8ld received frames (RXF)\n", atomic_long_read(&pkg_stats->rx_frames)); seq_printf(m, " %8ld matched frames (RXMF)\n", atomic_long_read(&pkg_stats->matches));
seq_putc(m, '\n');
if (net->can.stattimer.function == can_stat_update) { seq_printf(m, " %8ld %% total match ratio (RXMR)\n", pkg_stats->total_rx_match_ratio);
seq_printf(m, " %8ld frames/s total tx rate (TXR)\n", pkg_stats->total_tx_rate); seq_printf(m, " %8ld frames/s total rx rate (RXR)\n", pkg_stats->total_rx_rate);
seq_putc(m, '\n');
seq_printf(m, " %8ld %% current match ratio (CRXMR)\n", pkg_stats->current_rx_match_ratio);
seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n", pkg_stats->current_tx_rate); seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n", pkg_stats->current_rx_rate);
seq_putc(m, '\n');
seq_printf(m, " %8ld %% max match ratio (MRXMR)\n", pkg_stats->max_rx_match_ratio);
seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n", pkg_stats->max_tx_rate); seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n", pkg_stats->max_rx_rate);
seq_putc(m, '\n'); }
seq_printf(m, " %8ld current receive list entries (CRCV)\n", rcv_lists_stats->rcv_entries); seq_printf(m, " %8ld maximum receive list entries (MRCV)\n", rcv_lists_stats->rcv_entries_max);
if (rcv_lists_stats->stats_reset) seq_printf(m, "\n %8ld statistic resets (STR)\n", rcv_lists_stats->stats_reset);
if (rcv_lists_stats->user_reset) seq_printf(m, " %8ld user statistic resets (USTR)\n", rcv_lists_stats->user_reset);
seq_putc(m, '\n'); return 0;}
static int can_reset_stats_proc_show(struct seq_file *m, void *v){ struct net *net = m->private; struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
user_reset = 1;
if (net->can.stattimer.function == can_stat_update) { seq_printf(m, "Scheduled statistic reset #%ld.\n", rcv_lists_stats->stats_reset + 1); } else { if (pkg_stats->jiffies_init != jiffies) can_init_stats(net);
seq_printf(m, "Performed statistic reset #%ld.\n", rcv_lists_stats->stats_reset); } return 0;}
static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx, struct net_device *dev, struct can_dev_rcv_lists *dev_rcv_lists){ if (!hlist_empty(&dev_rcv_lists->rx[idx])) { can_print_recv_banner(m); can_print_rcvlist(m, &dev_rcv_lists->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)pde_data(m->file->f_inode); struct net_device *dev; struct can_dev_rcv_lists *dev_rcv_lists; struct net *net = m->private;
seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
rcu_read_lock();
/* receive list for 'all' CAN devices (dev == NULL) */ dev_rcv_lists = net->can.rx_alldev_list; can_rcvlist_proc_show_one(m, idx, NULL, dev_rcv_lists);
/* receive list for registered CAN devices */ for_each_netdev_rcu(net, dev) { struct can_ml_priv *can_ml = can_get_ml_priv(dev);
if (can_ml) can_rcvlist_proc_show_one(m, idx, dev, &can_ml->dev_rcv_lists); }
rcu_read_unlock();
seq_putc(m, '\n'); return 0;}
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));}
static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v){ struct net_device *dev; struct can_dev_rcv_lists *dev_rcv_lists; struct net *net = m->private;
/* RX_SFF */ seq_puts(m, "\nreceive list 'rx_sff':\n");
rcu_read_lock();
/* sff receive list for 'all' CAN devices (dev == NULL) */ dev_rcv_lists = net->can.rx_alldev_list; can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_sff, ARRAY_SIZE(dev_rcv_lists->rx_sff));
/* sff receive list for registered CAN devices */ for_each_netdev_rcu(net, dev) { struct can_ml_priv *can_ml = can_get_ml_priv(dev);
if (can_ml) { dev_rcv_lists = &can_ml->dev_rcv_lists; can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_sff, ARRAY_SIZE(dev_rcv_lists->rx_sff)); } }
rcu_read_unlock();
seq_putc(m, '\n'); return 0;}
static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v){ struct net_device *dev; struct can_dev_rcv_lists *dev_rcv_lists; struct net *net = m->private;
/* RX_EFF */ seq_puts(m, "\nreceive list 'rx_eff':\n");
rcu_read_lock();
/* eff receive list for 'all' CAN devices (dev == NULL) */ dev_rcv_lists = net->can.rx_alldev_list; can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_eff, ARRAY_SIZE(dev_rcv_lists->rx_eff));
/* eff receive list for registered CAN devices */ for_each_netdev_rcu(net, dev) { struct can_ml_priv *can_ml = can_get_ml_priv(dev);
if (can_ml) { dev_rcv_lists = &can_ml->dev_rcv_lists; can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_eff, ARRAY_SIZE(dev_rcv_lists->rx_eff)); } }
rcu_read_unlock();
seq_putc(m, '\n'); return 0;}
/* * can_init_proc - create main CAN proc directory and procfs entries */void can_init_proc(struct net *net){ /* create /proc/net/can directory */ net->can.proc_dir = proc_net_mkdir(net, "can", net->proc_net);
if (!net->can.proc_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 */ net->can.pde_stats = proc_create_net_single(CAN_PROC_STATS, 0644, net->can.proc_dir, can_stats_proc_show, NULL); net->can.pde_reset_stats = proc_create_net_single(CAN_PROC_RESET_STATS, 0644, net->can.proc_dir, can_reset_stats_proc_show, NULL); net->can.pde_rcvlist_err = proc_create_net_single(CAN_PROC_RCVLIST_ERR, 0644, net->can.proc_dir, can_rcvlist_proc_show, (void *)RX_ERR); net->can.pde_rcvlist_all = proc_create_net_single(CAN_PROC_RCVLIST_ALL, 0644, net->can.proc_dir, can_rcvlist_proc_show, (void *)RX_ALL); net->can.pde_rcvlist_fil = proc_create_net_single(CAN_PROC_RCVLIST_FIL, 0644, net->can.proc_dir, can_rcvlist_proc_show, (void *)RX_FIL); net->can.pde_rcvlist_inv = proc_create_net_single(CAN_PROC_RCVLIST_INV, 0644, net->can.proc_dir, can_rcvlist_proc_show, (void *)RX_INV); net->can.pde_rcvlist_eff = proc_create_net_single(CAN_PROC_RCVLIST_EFF, 0644, net->can.proc_dir, can_rcvlist_eff_proc_show, NULL); net->can.pde_rcvlist_sff = proc_create_net_single(CAN_PROC_RCVLIST_SFF, 0644, net->can.proc_dir, can_rcvlist_sff_proc_show, NULL);}
/* * can_remove_proc - remove procfs entries and main CAN proc directory */void can_remove_proc(struct net *net){ if (!net->can.proc_dir) return;
if (net->can.pde_stats) remove_proc_entry(CAN_PROC_STATS, net->can.proc_dir);
if (net->can.pde_reset_stats) remove_proc_entry(CAN_PROC_RESET_STATS, net->can.proc_dir);
if (net->can.pde_rcvlist_err) remove_proc_entry(CAN_PROC_RCVLIST_ERR, net->can.proc_dir);
if (net->can.pde_rcvlist_all) remove_proc_entry(CAN_PROC_RCVLIST_ALL, net->can.proc_dir);
if (net->can.pde_rcvlist_fil) remove_proc_entry(CAN_PROC_RCVLIST_FIL, net->can.proc_dir);
if (net->can.pde_rcvlist_inv) remove_proc_entry(CAN_PROC_RCVLIST_INV, net->can.proc_dir);
if (net->can.pde_rcvlist_eff) remove_proc_entry(CAN_PROC_RCVLIST_EFF, net->can.proc_dir);
if (net->can.pde_rcvlist_sff) remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);
remove_proc_entry("can", net->proc_net);}