* [PATCH RFC v2] can: complete initial namespace support
@ 2017-04-10 12:41 Oliver Hartkopp
2017-04-14 12:51 ` Marc Kleine-Budde
0 siblings, 1 reply; 2+ messages in thread
From: Oliver Hartkopp @ 2017-04-10 12:41 UTC (permalink / raw)
To: linux-can; +Cc: dev, mkl, Oliver Hartkopp
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 per-net statistics and fixes a memory leak due to the
missing kfree of can_rx_alldev_list in can_pernet_exit().
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
include/net/netns/can.h | 5 ++
net/can/af_can.c | 71 +++++++++++++------------
net/can/af_can.h | 9 ----
net/can/proc.c | 135 ++++++++++++++++++++++++++----------------------
4 files changed, 117 insertions(+), 103 deletions(-)
diff --git a/include/net/netns/can.h b/include/net/netns/can.h
index e8beba772f1a..574157dbc43a 100644
--- a/include/net/netns/can.h
+++ b/include/net/netns/can.h
@@ -8,6 +8,8 @@
#include <linux/spinlock.h>
struct dev_rcv_lists;
+struct s_stats;
+struct s_pstats;
struct netns_can {
#if IS_ENABLED(CONFIG_PROC_FS)
@@ -26,6 +28,9 @@ struct netns_can {
/* 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__ */
diff --git a/net/can/af_can.c b/net/can/af_can.c
index abf7d854a94d..e53030289531 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -83,10 +83,6 @@ static struct kmem_cache *rcv_cache __read_mostly;
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);
/*
@@ -223,6 +219,7 @@ int can_send(struct sk_buff *skb, int loop)
{
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) {
@@ -311,8 +308,8 @@ int can_send(struct sk_buff *skb, int loop)
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;
@@ -470,6 +467,7 @@ int can_rx_register(struct net *net, struct net_device *dev, canid_t can_id,
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) */
@@ -501,9 +499,9 @@ int can_rx_register(struct net *net, struct net_device *dev, canid_t can_id,
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;
@@ -545,6 +543,7 @@ void can_rx_unregister(struct net *net, struct net_device *dev, canid_t can_id,
{
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)
@@ -591,8 +590,8 @@ void can_rx_unregister(struct net *net, struct net_device *dev, canid_t can_id,
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) {
@@ -686,11 +685,13 @@ static int can_rcv_filter(struct dev_rcv_lists *d, struct sk_buff *skb)
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))
@@ -699,10 +700,10 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev)
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);
@@ -712,8 +713,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev)
consume_skb(skb);
if (matches > 0) {
- can_stats.matches++;
- can_stats.matches_delta++;
+ can_stats->matches++;
+ can_stats->matches_delta++;
}
}
@@ -878,8 +879,20 @@ static int can_pernet_init(struct net *net)
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;
}
@@ -888,8 +901,11 @@ static void can_pernet_exit(struct net *net)
{
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();
@@ -903,6 +919,10 @@ static void can_pernet_exit(struct net *net)
}
}
rcu_read_unlock();
+
+ kfree(net->can.can_rx_alldev_list);
+ kfree(net->can.can_stats);
+ kfree(net->can.can_pstats);
}
/*
@@ -952,14 +972,6 @@ static __init int can_init(void)
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 */
@@ -973,11 +985,6 @@ static __init int can_init(void)
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);
diff --git a/net/can/af_can.h b/net/can/af_can.h
index f273c9d9b129..d0ef45bb2a72 100644
--- a/net/can/af_can.h
+++ b/net/can/af_can.h
@@ -110,18 +110,9 @@ struct s_pstats {
unsigned long rcv_entries_max;
};
-/* receive filters subscribed for 'all' CAN devices */
-extern struct dev_rcv_lists can_rx_alldev_list;
-
/* function prototypes for the CAN networklayer procfs (proc.c) */
void can_init_proc(struct net *net);
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 */
-extern struct hlist_head can_rx_dev_list; /* rx dispatcher structures */
-
#endif /* AF_CAN_H */
diff --git a/net/can/proc.c b/net/can/proc.c
index 9a8d54d57b22..1a7d95e2335b 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -75,21 +75,23 @@ static const char rx_list_name[][8] = {
* 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++;
}
}
@@ -115,64 +117,66 @@ static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
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));
}
/*
@@ -206,57 +210,61 @@ static void can_print_recv_banner(struct seq_file *m)
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;
@@ -277,18 +285,21 @@ 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;
}
--
2.11.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH RFC v2] can: complete initial namespace support
2017-04-10 12:41 [PATCH RFC v2] can: complete initial namespace support Oliver Hartkopp
@ 2017-04-14 12:51 ` Marc Kleine-Budde
0 siblings, 0 replies; 2+ messages in thread
From: Marc Kleine-Budde @ 2017-04-14 12:51 UTC (permalink / raw)
To: Oliver Hartkopp, linux-can; +Cc: dev
[-- Attachment #1.1: Type: text/plain, Size: 759 bytes --]
On 04/10/2017 02:41 PM, Oliver Hartkopp wrote:
> 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 per-net statistics and fixes a memory leak due to the
> missing kfree of can_rx_alldev_list in can_pernet_exit().
>
> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
I've split the memleak fix into a seperate patch - added both to can-next.
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-04-10 12:41 [PATCH RFC v2] can: complete initial namespace support Oliver Hartkopp
2017-04-14 12:51 ` Marc Kleine-Budde
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