can: complete initial namespace support

The statistics and its proc output was not implemented as per-net in the
initial network namespace support by Mario Kicherer (8e8cda6d737d).
This patch adds the missing per-net statistics for the CAN subsystem.

Signed-off-by: Oliver Hartkopp <[e-mail]>
Signed-off-by: Marc Kleine-Budde <[e-mail]>

include/linux/can/core.h

···
  *
  * Authors: Oliver Hartkopp <[e-mail]>
  *          Urs Thuermann   <[e-mail]>
- * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
+ * Copyright (c) 2002-2017 Volkswagen Group Electronic Research
  * All rights reserved.
  *
  */
···
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
 
-#define CAN_VERSION "20120528"
+#define CAN_VERSION "20170425"
 
 /* increment this number each time you change some user-space interface */
 #define CAN_ABI_VERSION "9"

include/net/netns/can.h

···
 #include <linux/spinlock.h>
 
 struct dev_rcv_lists;
+struct s_stats;
+struct s_pstats;
 
 struct netns_can {
 #if IS_ENABLED(CONFIG_PROC_FS)
···
 	/* receive filters subscribed for 'all' CAN devices */
 	struct dev_rcv_lists *can_rx_alldev_list;
 	spinlock_t can_rcvlists_lock;
+	struct timer_list can_stattimer;/* timer for statistics update */
+	struct s_stats *can_stats;	/* packet statistics */
+	struct s_pstats *can_pstats;	/* receive list statistics */
 };
 
 #endif /* __NETNS_CAN_H__ */

net/can/af_can.c

···
  * af_can.c - Protocol family CAN core module
  *            (used by different CAN protocol modules)
  *
- * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
+ * Copyright (c) 2002-2017 Volkswagen Group Electronic Research
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
···
 /* table of registered CAN protocols */
 static const struct can_proto *proto_tab[CAN_NPROTO] __read_mostly;
 static DEFINE_MUTEX(proto_tab_lock);
-
-struct timer_list can_stattimer;   /* timer for statistics update */
-struct s_stats    can_stats;       /* packet statistics */
-struct s_pstats   can_pstats;      /* receive list statistics */
 
 static atomic_t skbcounter = ATOMIC_INIT(0);
 
···
 {
 	struct sk_buff *newskb = NULL;
 	struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
+	struct s_stats *can_stats = dev_net(skb->dev)->can.can_stats;
 	int err = -EINVAL;
 
 	if (skb->len == CAN_MTU) {
···
 		netif_rx_ni(newskb);
 
 	/* update statistics */
-	can_stats.tx_frames++;
-	can_stats.tx_frames_delta++;
+	can_stats->tx_frames++;
+	can_stats->tx_frames_delta++;
 
 	return 0;
 
···
 	struct receiver *r;
 	struct hlist_head *rl;
 	struct dev_rcv_lists *d;
+	struct s_pstats *can_pstats = net->can.can_pstats;
 	int err = 0;
 
 	/* insert new receiver  (dev,canid,mask) -> (func,data) */
···
 		hlist_add_head_rcu(&r->list, rl);
 		d->entries++;
 
-		can_pstats.rcv_entries++;
-		if (can_pstats.rcv_entries_max < can_pstats.rcv_entries)
-			can_pstats.rcv_entries_max = can_pstats.rcv_entries;
+		can_pstats->rcv_entries++;
+		if (can_pstats->rcv_entries_max < can_pstats->rcv_entries)
+			can_pstats->rcv_entries_max = can_pstats->rcv_entries;
 	} else {
 		kmem_cache_free(rcv_cache, r);
 		err = -ENODEV;
···
 {
 	struct receiver *r = NULL;
 	struct hlist_head *rl;
+	struct s_pstats *can_pstats = net->can.can_pstats;
 	struct dev_rcv_lists *d;
 
 	if (dev && dev->type != ARPHRD_CAN)
···
 	hlist_del_rcu(&r->list);
 	d->entries--;
 
-	if (can_pstats.rcv_entries > 0)
-		can_pstats.rcv_entries--;
+	if (can_pstats->rcv_entries > 0)
+		can_pstats->rcv_entries--;
 
 	/* remove device structure requested by NETDEV_UNREGISTER */
 	if (d->remove_on_zero_entries && !d->entries) {
···
 static void can_receive(struct sk_buff *skb, struct net_device *dev)
 {
 	struct dev_rcv_lists *d;
+	struct net *net = dev_net(dev);
+	struct s_stats *can_stats = net->can.can_stats;
 	int matches;
 
 	/* update statistics */
-	can_stats.rx_frames++;
-	can_stats.rx_frames_delta++;
+	can_stats->rx_frames++;
+	can_stats->rx_frames_delta++;
 
 	/* create non-zero unique skb identifier together with *skb */
 	while (!(can_skb_prv(skb)->skbcnt))
···
 	rcu_read_lock();
 
 	/* deliver the packet to sockets listening on all devices */
-	matches = can_rcv_filter(dev_net(dev)->can.can_rx_alldev_list, skb);
+	matches = can_rcv_filter(net->can.can_rx_alldev_list, skb);
 
 	/* find receive list for this device */
-	d = find_dev_rcv_lists(dev_net(dev), dev);
+	d = find_dev_rcv_lists(net, dev);
 	if (d)
 		matches += can_rcv_filter(d, skb);
 
···
 	consume_skb(skb);
 
 	if (matches > 0) {
-		can_stats.matches++;
-		can_stats.matches_delta++;
+		can_stats->matches++;
+		can_stats->matches_delta++;
 	}
 }
 
···
 	net->can.can_rx_alldev_list =
 		kzalloc(sizeof(struct dev_rcv_lists), GFP_KERNEL);
 
-	if (IS_ENABLED(CONFIG_PROC_FS))
+	net->can.can_stats = kzalloc(sizeof(struct s_stats), GFP_KERNEL);
+	net->can.can_pstats = kzalloc(sizeof(struct s_pstats), GFP_KERNEL);
+
+	if (IS_ENABLED(CONFIG_PROC_FS)) {
+		/* the statistics are updated every second (timer triggered) */
+		if (stats_timer) {
+			setup_timer(&net->can.can_stattimer, can_stat_update,
+				    (unsigned long)net);
+			mod_timer(&net->can.can_stattimer,
+				  round_jiffies(jiffies + HZ));
+		}
+		net->can.can_stats->jiffies_init = jiffies;
 		can_init_proc(net);
+	}
 
 	return 0;
 }
···
 {
 	struct net_device *dev;
 
-	if (IS_ENABLED(CONFIG_PROC_FS))
+	if (IS_ENABLED(CONFIG_PROC_FS)) {
 		can_remove_proc(net);
+		if (stats_timer)
+			del_timer_sync(&net->can.can_stattimer);
+	}
 
 	/* remove created dev_rcv_lists from still registered CAN devices */
 	rcu_read_lock();
···
 	rcu_read_unlock();
 
 	kfree(net->can.can_rx_alldev_list);
+	kfree(net->can.can_stats);
+	kfree(net->can.can_pstats);
 }
 
 /*
···
 	if (!rcv_cache)
 		return -ENOMEM;
 
-	if (IS_ENABLED(CONFIG_PROC_FS)) {
-		if (stats_timer) {
-		/* the statistics are updated every second (timer triggered) */
-			setup_timer(&can_stattimer, can_stat_update, 0);
-			mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
-		}
-	}
-
 	register_pernet_subsys(&can_pernet_ops);
 
 	/* protocol register */
···
 
 static __exit void can_exit(void)
 {
-	if (IS_ENABLED(CONFIG_PROC_FS)) {
-		if (stats_timer)
-			del_timer_sync(&can_stattimer);
-	}
-
 	/* protocol unregister */
 	dev_remove_pack(&canfd_packet);
 	dev_remove_pack(&can_packet);

net/can/af_can.h

···
 void can_remove_proc(struct net *net);
 void can_stat_update(unsigned long data);
 
-/* structures and variables from af_can.c needed in proc.c for reading */
-extern struct timer_list can_stattimer;    /* timer for statistics update */
-extern struct s_stats    can_stats;        /* packet statistics */
-extern struct s_pstats   can_pstats;       /* receive list statistics */
-
 #endif /* AF_CAN_H */

net/can/proc.c

···
  * af_can statistics stuff
  */
 
-static void can_init_stats(void)
+static void can_init_stats(struct net *net)
 {
+	struct s_stats *can_stats = net->can.can_stats;
+	struct s_pstats *can_pstats = net->can.can_pstats;
 	/*
 	 * 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;
+	memset(can_stats, 0, sizeof(struct s_stats));
+	can_stats->jiffies_init = jiffies;
 
-	can_pstats.stats_reset++;
+	can_pstats->stats_reset++;
 
 	if (user_reset) {
 		user_reset = 0;
-		can_pstats.user_reset++;
+		can_pstats->user_reset++;
 	}
 }
 
···
 
 void can_stat_update(unsigned long data)
 {
+	struct net *net = (struct net *)data;
+	struct s_stats *can_stats = net->can.can_stats;
 	unsigned long j = jiffies; /* snapshot */
 
 	/* restart counting in timer context on user request */
 	if (user_reset)
-		can_init_stats();
+		can_init_stats(net);
 
 	/* restart counting on jiffies overflow */
-	if (j < can_stats.jiffies_init)
-		can_init_stats();
+	if (j < can_stats->jiffies_init)
+		can_init_stats(net);
 
 	/* prevent overflow in calc_rate() */
-	if (can_stats.rx_frames > (ULONG_MAX / HZ))
-		can_init_stats();
+	if (can_stats->rx_frames > (ULONG_MAX / HZ))
+		can_init_stats(net);
 
 	/* prevent overflow in calc_rate() */
-	if (can_stats.tx_frames > (ULONG_MAX / HZ))
-		can_init_stats();
+	if (can_stats->tx_frames > (ULONG_MAX / HZ))
+		can_init_stats(net);
 
 	/* matches overflow - very improbable */
-	if (can_stats.matches > (ULONG_MAX / 100))
-		can_init_stats();
+	if (can_stats->matches > (ULONG_MAX / 100))
+		can_init_stats(net);
 
 	/* calc total values */
-	if (can_stats.rx_frames)
-		can_stats.total_rx_match_ratio = (can_stats.matches * 100) /
-			can_stats.rx_frames;
+	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);
+	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;
+	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);
+	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_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_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;
+	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;
+	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));
+	mod_timer(&net->can.can_stattimer, round_jiffies(jiffies + HZ));
 }
 
 /*
···
 
 static int can_stats_proc_show(struct seq_file *m, void *v)
 {
+	struct net *net = m->private;
+	struct s_stats *can_stats = net->can.can_stats;
+	struct s_pstats *can_pstats = net->can.can_pstats;
+
 	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_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) {
+	if (net->can.can_stattimer.function == can_stat_update) {
 		seq_printf(m, " %8ld %% total match ratio (RXMR)\n",
-				can_stats.total_rx_match_ratio);
+				can_stats->total_rx_match_ratio);
 
 		seq_printf(m, " %8ld frames/s total tx rate (TXR)\n",
-				can_stats.total_tx_rate);
+				can_stats->total_tx_rate);
 		seq_printf(m, " %8ld frames/s total rx rate (RXR)\n",
-				can_stats.total_rx_rate);
+				can_stats->total_rx_rate);
 
 		seq_putc(m, '\n');
 
 		seq_printf(m, " %8ld %% current match ratio (CRXMR)\n",
-				can_stats.current_rx_match_ratio);
+				can_stats->current_rx_match_ratio);
 
 		seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n",
-				can_stats.current_tx_rate);
+				can_stats->current_tx_rate);
 		seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n",
-				can_stats.current_rx_rate);
+				can_stats->current_rx_rate);
 
 		seq_putc(m, '\n');
 
 		seq_printf(m, " %8ld %% max match ratio (MRXMR)\n",
-				can_stats.max_rx_match_ratio);
+				can_stats->max_rx_match_ratio);
 
 		seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n",
-				can_stats.max_tx_rate);
+				can_stats->max_tx_rate);
 		seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n",
-				can_stats.max_rx_rate);
+				can_stats->max_rx_rate);
 
 		seq_putc(m, '\n');
 	}
 
 	seq_printf(m, " %8ld current receive list entries (CRCV)\n",
-			can_pstats.rcv_entries);
+			can_pstats->rcv_entries);
 	seq_printf(m, " %8ld maximum receive list entries (MRCV)\n",
-			can_pstats.rcv_entries_max);
+			can_pstats->rcv_entries_max);
 
-	if (can_pstats.stats_reset)
+	if (can_pstats->stats_reset)
 		seq_printf(m, "\n %8ld statistic resets (STR)\n",
-				can_pstats.stats_reset);
+				can_pstats->stats_reset);
 
-	if (can_pstats.user_reset)
+	if (can_pstats->user_reset)
 		seq_printf(m, " %8ld user statistic resets (USTR)\n",
-				can_pstats.user_reset);
+				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);
+	return single_open_net(inode, file, can_stats_proc_show);
 }
 
 static const struct file_operations can_stats_proc_fops = {
···
 
 static int can_reset_stats_proc_show(struct seq_file *m, void *v)
 {
+	struct net *net = m->private;
+	struct s_pstats *can_pstats = net->can.can_pstats;
+	struct s_stats *can_stats = net->can.can_stats;
+
 	user_reset = 1;
 
-	if (can_stattimer.function == can_stat_update) {
+	if (net->can.can_stattimer.function == can_stat_update) {
 		seq_printf(m, "Scheduled statistic reset #%ld.\n",
-				can_pstats.stats_reset + 1);
-
+				can_pstats->stats_reset + 1);
 	} else {
-		if (can_stats.jiffies_init != jiffies)
-			can_init_stats();
+		if (can_stats->jiffies_init != jiffies)
+			can_init_stats(net);
 
 		seq_printf(m, "Performed statistic reset #%ld.\n",
-				can_pstats.stats_reset);
+				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);
+	return single_open_net(inode, file, can_reset_stats_proc_show);
 }
 
 static const struct file_operations can_reset_stats_proc_fops = {
···
 
 static int can_version_proc_open(struct inode *inode, struct file *file)
 {
-	return single_open(file, can_version_proc_show, NULL);
+	return single_open_net(inode, file, can_version_proc_show);
 }
 
 static const struct file_operations can_version_proc_fops = {