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498 lines
15 KiB
498 lines
15 KiB
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
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/* |
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* proc.c - procfs support for Protocol family CAN core module |
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* |
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* Copyright (c) 2002-2007 Volkswagen Group Electronic Research |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of Volkswagen nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* Alternatively, provided that this notice is retained in full, this |
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* software may be distributed under the terms of the GNU General |
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* Public License ("GPL") version 2, in which case the provisions of the |
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* GPL apply INSTEAD OF those given above. |
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* |
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* The provided data structures and external interfaces from this code |
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* are not restricted to be used by modules with a GPL compatible license. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/proc_fs.h> |
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#include <linux/list.h> |
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#include <linux/rcupdate.h> |
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#include <linux/if_arp.h> |
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#include <linux/can/can-ml.h> |
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#include <linux/can/core.h> |
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#include "af_can.h" |
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/* |
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* proc filenames for the PF_CAN core |
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*/ |
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#define CAN_PROC_STATS "stats" |
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#define CAN_PROC_RESET_STATS "reset_stats" |
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#define CAN_PROC_RCVLIST_ALL "rcvlist_all" |
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#define CAN_PROC_RCVLIST_FIL "rcvlist_fil" |
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#define CAN_PROC_RCVLIST_INV "rcvlist_inv" |
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#define CAN_PROC_RCVLIST_SFF "rcvlist_sff" |
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#define CAN_PROC_RCVLIST_EFF "rcvlist_eff" |
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#define CAN_PROC_RCVLIST_ERR "rcvlist_err" |
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static int user_reset; |
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static const char rx_list_name[][8] = { |
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[RX_ERR] = "rx_err", |
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[RX_ALL] = "rx_all", |
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[RX_FIL] = "rx_fil", |
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[RX_INV] = "rx_inv", |
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}; |
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/* |
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* af_can statistics stuff |
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*/ |
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static void can_init_stats(struct net *net) |
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{ |
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struct can_pkg_stats *pkg_stats = net->can.pkg_stats; |
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struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; |
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/* |
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* This memset function is called from a timer context (when |
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* can_stattimer is active which is the default) OR in a process |
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* context (reading the proc_fs when can_stattimer is disabled). |
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*/ |
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memset(pkg_stats, 0, sizeof(struct can_pkg_stats)); |
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pkg_stats->jiffies_init = jiffies; |
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rcv_lists_stats->stats_reset++; |
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if (user_reset) { |
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user_reset = 0; |
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rcv_lists_stats->user_reset++; |
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} |
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} |
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static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif, |
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unsigned long count) |
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{ |
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if (oldjif == newjif) |
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return 0; |
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/* see can_stat_update() - this should NEVER happen! */ |
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if (count > (ULONG_MAX / HZ)) { |
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printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n", |
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count); |
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return 99999999; |
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} |
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return (count * HZ) / (newjif - oldjif); |
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} |
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void can_stat_update(struct timer_list *t) |
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{ |
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struct net *net = from_timer(net, t, can.stattimer); |
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struct can_pkg_stats *pkg_stats = net->can.pkg_stats; |
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unsigned long j = jiffies; /* snapshot */ |
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/* restart counting in timer context on user request */ |
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if (user_reset) |
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can_init_stats(net); |
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/* restart counting on jiffies overflow */ |
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if (j < pkg_stats->jiffies_init) |
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can_init_stats(net); |
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/* prevent overflow in calc_rate() */ |
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if (pkg_stats->rx_frames > (ULONG_MAX / HZ)) |
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can_init_stats(net); |
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/* prevent overflow in calc_rate() */ |
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if (pkg_stats->tx_frames > (ULONG_MAX / HZ)) |
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can_init_stats(net); |
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/* matches overflow - very improbable */ |
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if (pkg_stats->matches > (ULONG_MAX / 100)) |
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can_init_stats(net); |
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/* calc total values */ |
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if (pkg_stats->rx_frames) |
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pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) / |
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pkg_stats->rx_frames; |
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pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j, |
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pkg_stats->tx_frames); |
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pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j, |
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pkg_stats->rx_frames); |
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/* calc current values */ |
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if (pkg_stats->rx_frames_delta) |
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pkg_stats->current_rx_match_ratio = |
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(pkg_stats->matches_delta * 100) / |
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pkg_stats->rx_frames_delta; |
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pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta); |
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pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta); |
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/* check / update maximum values */ |
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if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate) |
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pkg_stats->max_tx_rate = pkg_stats->current_tx_rate; |
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if (pkg_stats->max_rx_rate < pkg_stats->current_rx_rate) |
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pkg_stats->max_rx_rate = pkg_stats->current_rx_rate; |
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if (pkg_stats->max_rx_match_ratio < pkg_stats->current_rx_match_ratio) |
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pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio; |
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/* clear values for 'current rate' calculation */ |
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pkg_stats->tx_frames_delta = 0; |
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pkg_stats->rx_frames_delta = 0; |
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pkg_stats->matches_delta = 0; |
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/* restart timer (one second) */ |
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mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ)); |
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} |
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/* |
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* proc read functions |
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*/ |
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static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list, |
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struct net_device *dev) |
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{ |
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struct receiver *r; |
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hlist_for_each_entry_rcu(r, rx_list, list) { |
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char *fmt = (r->can_id & CAN_EFF_FLAG)? |
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" %-5s %08x %08x %pK %pK %8ld %s\n" : |
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" %-5s %03x %08x %pK %pK %8ld %s\n"; |
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seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask, |
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r->func, r->data, r->matches, r->ident); |
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} |
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} |
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static void can_print_recv_banner(struct seq_file *m) |
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{ |
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/* |
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* can1. 00000000 00000000 00000000 |
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* ....... 0 tp20 |
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*/ |
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if (IS_ENABLED(CONFIG_64BIT)) |
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seq_puts(m, " device can_id can_mask function userdata matches ident\n"); |
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else |
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seq_puts(m, " device can_id can_mask function userdata matches ident\n"); |
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} |
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static int can_stats_proc_show(struct seq_file *m, void *v) |
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{ |
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struct net *net = m->private; |
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struct can_pkg_stats *pkg_stats = net->can.pkg_stats; |
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struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; |
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seq_putc(m, '\n'); |
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seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames); |
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seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames); |
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seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches); |
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seq_putc(m, '\n'); |
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if (net->can.stattimer.function == can_stat_update) { |
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seq_printf(m, " %8ld %% total match ratio (RXMR)\n", |
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pkg_stats->total_rx_match_ratio); |
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seq_printf(m, " %8ld frames/s total tx rate (TXR)\n", |
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pkg_stats->total_tx_rate); |
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seq_printf(m, " %8ld frames/s total rx rate (RXR)\n", |
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pkg_stats->total_rx_rate); |
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seq_putc(m, '\n'); |
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seq_printf(m, " %8ld %% current match ratio (CRXMR)\n", |
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pkg_stats->current_rx_match_ratio); |
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seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n", |
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pkg_stats->current_tx_rate); |
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seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n", |
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pkg_stats->current_rx_rate); |
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seq_putc(m, '\n'); |
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seq_printf(m, " %8ld %% max match ratio (MRXMR)\n", |
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pkg_stats->max_rx_match_ratio); |
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seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n", |
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pkg_stats->max_tx_rate); |
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seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n", |
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pkg_stats->max_rx_rate); |
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seq_putc(m, '\n'); |
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} |
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seq_printf(m, " %8ld current receive list entries (CRCV)\n", |
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rcv_lists_stats->rcv_entries); |
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seq_printf(m, " %8ld maximum receive list entries (MRCV)\n", |
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rcv_lists_stats->rcv_entries_max); |
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if (rcv_lists_stats->stats_reset) |
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seq_printf(m, "\n %8ld statistic resets (STR)\n", |
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rcv_lists_stats->stats_reset); |
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if (rcv_lists_stats->user_reset) |
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seq_printf(m, " %8ld user statistic resets (USTR)\n", |
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rcv_lists_stats->user_reset); |
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seq_putc(m, '\n'); |
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return 0; |
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} |
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static int can_reset_stats_proc_show(struct seq_file *m, void *v) |
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{ |
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struct net *net = m->private; |
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struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; |
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struct can_pkg_stats *pkg_stats = net->can.pkg_stats; |
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user_reset = 1; |
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if (net->can.stattimer.function == can_stat_update) { |
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seq_printf(m, "Scheduled statistic reset #%ld.\n", |
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rcv_lists_stats->stats_reset + 1); |
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} else { |
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if (pkg_stats->jiffies_init != jiffies) |
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can_init_stats(net); |
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seq_printf(m, "Performed statistic reset #%ld.\n", |
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rcv_lists_stats->stats_reset); |
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} |
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return 0; |
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} |
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static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx, |
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struct net_device *dev, |
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struct can_dev_rcv_lists *dev_rcv_lists) |
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{ |
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if (!hlist_empty(&dev_rcv_lists->rx[idx])) { |
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can_print_recv_banner(m); |
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can_print_rcvlist(m, &dev_rcv_lists->rx[idx], dev); |
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} else |
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seq_printf(m, " (%s: no entry)\n", DNAME(dev)); |
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} |
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static int can_rcvlist_proc_show(struct seq_file *m, void *v) |
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{ |
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/* double cast to prevent GCC warning */ |
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int idx = (int)(long)PDE_DATA(m->file->f_inode); |
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struct net_device *dev; |
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struct can_dev_rcv_lists *dev_rcv_lists; |
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struct net *net = m->private; |
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seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]); |
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rcu_read_lock(); |
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/* receive list for 'all' CAN devices (dev == NULL) */ |
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dev_rcv_lists = net->can.rx_alldev_list; |
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can_rcvlist_proc_show_one(m, idx, NULL, dev_rcv_lists); |
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/* receive list for registered CAN devices */ |
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for_each_netdev_rcu(net, dev) { |
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struct can_ml_priv *can_ml = can_get_ml_priv(dev); |
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if (can_ml) |
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can_rcvlist_proc_show_one(m, idx, dev, |
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&can_ml->dev_rcv_lists); |
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} |
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rcu_read_unlock(); |
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seq_putc(m, '\n'); |
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return 0; |
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} |
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static inline void can_rcvlist_proc_show_array(struct seq_file *m, |
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struct net_device *dev, |
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struct hlist_head *rcv_array, |
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unsigned int rcv_array_sz) |
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{ |
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unsigned int i; |
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int all_empty = 1; |
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/* check whether at least one list is non-empty */ |
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for (i = 0; i < rcv_array_sz; i++) |
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if (!hlist_empty(&rcv_array[i])) { |
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all_empty = 0; |
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break; |
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} |
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if (!all_empty) { |
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can_print_recv_banner(m); |
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for (i = 0; i < rcv_array_sz; i++) { |
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if (!hlist_empty(&rcv_array[i])) |
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can_print_rcvlist(m, &rcv_array[i], dev); |
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} |
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} else |
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seq_printf(m, " (%s: no entry)\n", DNAME(dev)); |
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} |
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static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v) |
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{ |
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struct net_device *dev; |
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struct can_dev_rcv_lists *dev_rcv_lists; |
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struct net *net = m->private; |
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/* RX_SFF */ |
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seq_puts(m, "\nreceive list 'rx_sff':\n"); |
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rcu_read_lock(); |
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/* sff receive list for 'all' CAN devices (dev == NULL) */ |
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dev_rcv_lists = net->can.rx_alldev_list; |
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can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_sff, |
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ARRAY_SIZE(dev_rcv_lists->rx_sff)); |
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/* sff receive list for registered CAN devices */ |
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for_each_netdev_rcu(net, dev) { |
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struct can_ml_priv *can_ml = can_get_ml_priv(dev); |
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if (can_ml) { |
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dev_rcv_lists = &can_ml->dev_rcv_lists; |
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can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_sff, |
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ARRAY_SIZE(dev_rcv_lists->rx_sff)); |
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} |
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} |
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rcu_read_unlock(); |
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seq_putc(m, '\n'); |
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return 0; |
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} |
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static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v) |
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{ |
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struct net_device *dev; |
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struct can_dev_rcv_lists *dev_rcv_lists; |
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struct net *net = m->private; |
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/* RX_EFF */ |
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seq_puts(m, "\nreceive list 'rx_eff':\n"); |
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rcu_read_lock(); |
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/* eff receive list for 'all' CAN devices (dev == NULL) */ |
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dev_rcv_lists = net->can.rx_alldev_list; |
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can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_eff, |
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ARRAY_SIZE(dev_rcv_lists->rx_eff)); |
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/* eff receive list for registered CAN devices */ |
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for_each_netdev_rcu(net, dev) { |
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struct can_ml_priv *can_ml = can_get_ml_priv(dev); |
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if (can_ml) { |
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dev_rcv_lists = &can_ml->dev_rcv_lists; |
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can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_eff, |
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ARRAY_SIZE(dev_rcv_lists->rx_eff)); |
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} |
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} |
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rcu_read_unlock(); |
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seq_putc(m, '\n'); |
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return 0; |
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} |
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/* |
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* can_init_proc - create main CAN proc directory and procfs entries |
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*/ |
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void can_init_proc(struct net *net) |
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{ |
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/* create /proc/net/can directory */ |
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net->can.proc_dir = proc_net_mkdir(net, "can", net->proc_net); |
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if (!net->can.proc_dir) { |
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printk(KERN_INFO "can: failed to create /proc/net/can . " |
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"CONFIG_PROC_FS missing?\n"); |
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return; |
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} |
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/* own procfs entries from the AF_CAN core */ |
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net->can.pde_stats = proc_create_net_single(CAN_PROC_STATS, 0644, |
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net->can.proc_dir, can_stats_proc_show, NULL); |
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net->can.pde_reset_stats = proc_create_net_single(CAN_PROC_RESET_STATS, |
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0644, net->can.proc_dir, can_reset_stats_proc_show, |
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NULL); |
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net->can.pde_rcvlist_err = proc_create_net_single(CAN_PROC_RCVLIST_ERR, |
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0644, net->can.proc_dir, can_rcvlist_proc_show, |
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(void *)RX_ERR); |
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net->can.pde_rcvlist_all = proc_create_net_single(CAN_PROC_RCVLIST_ALL, |
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0644, net->can.proc_dir, can_rcvlist_proc_show, |
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(void *)RX_ALL); |
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net->can.pde_rcvlist_fil = proc_create_net_single(CAN_PROC_RCVLIST_FIL, |
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0644, net->can.proc_dir, can_rcvlist_proc_show, |
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(void *)RX_FIL); |
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net->can.pde_rcvlist_inv = proc_create_net_single(CAN_PROC_RCVLIST_INV, |
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0644, net->can.proc_dir, can_rcvlist_proc_show, |
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(void *)RX_INV); |
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net->can.pde_rcvlist_eff = proc_create_net_single(CAN_PROC_RCVLIST_EFF, |
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0644, net->can.proc_dir, can_rcvlist_eff_proc_show, NULL); |
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net->can.pde_rcvlist_sff = proc_create_net_single(CAN_PROC_RCVLIST_SFF, |
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0644, net->can.proc_dir, can_rcvlist_sff_proc_show, NULL); |
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} |
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/* |
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* can_remove_proc - remove procfs entries and main CAN proc directory |
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*/ |
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void can_remove_proc(struct net *net) |
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{ |
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if (!net->can.proc_dir) |
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return; |
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if (net->can.pde_stats) |
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remove_proc_entry(CAN_PROC_STATS, net->can.proc_dir); |
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if (net->can.pde_reset_stats) |
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remove_proc_entry(CAN_PROC_RESET_STATS, net->can.proc_dir); |
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if (net->can.pde_rcvlist_err) |
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remove_proc_entry(CAN_PROC_RCVLIST_ERR, net->can.proc_dir); |
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if (net->can.pde_rcvlist_all) |
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remove_proc_entry(CAN_PROC_RCVLIST_ALL, net->can.proc_dir); |
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if (net->can.pde_rcvlist_fil) |
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remove_proc_entry(CAN_PROC_RCVLIST_FIL, net->can.proc_dir); |
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if (net->can.pde_rcvlist_inv) |
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remove_proc_entry(CAN_PROC_RCVLIST_INV, net->can.proc_dir); |
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if (net->can.pde_rcvlist_eff) |
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remove_proc_entry(CAN_PROC_RCVLIST_EFF, net->can.proc_dir); |
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if (net->can.pde_rcvlist_sff) |
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remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir); |
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remove_proc_entry("can", net->proc_net); |
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}
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