* [PATCH] can: add missing initialization of CAN statistics
@ 2016-07-05 17:29 Oliver Hartkopp
2016-07-06 5:55 ` Oliver Hartkopp
0 siblings, 1 reply; 2+ messages in thread
From: Oliver Hartkopp @ 2016-07-05 17:29 UTC (permalink / raw)
To: linux-can; +Cc: Oliver Hartkopp
The total rx/tx rate (TXR and RXR) only start working after a statistic reset.
This fix initializes the statistic data structures and the timer init value to
provide proper values directly from the start.
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
The issue can be fixed by resetting the statistics by hand:
cat /proc/net/can/reset_stats
As nobody discovered the missing values so far there's no need to put this
patch to linux stable tree IMO.
---
net/can/af_can.c | 1 +
net/can/af_can.h | 1 +
net/can/proc.c | 21 ++++++++++++++-------
3 files changed, 16 insertions(+), 7 deletions(-)
diff --git a/net/can/af_can.c b/net/can/af_can.c
index 166d436..df8dcc3 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -911,6 +911,7 @@ static __init int can_init(void)
if (!rcv_cache)
return -ENOMEM;
+ can_init_stats();
if (stats_timer) {
/* the statistics are updated every second (timer triggered) */
setup_timer(&can_stattimer, can_stat_update, 0);
diff --git a/net/can/af_can.h b/net/can/af_can.h
index fca0fe9..8361047 100644
--- a/net/can/af_can.h
+++ b/net/can/af_can.h
@@ -115,6 +115,7 @@ extern struct dev_rcv_lists can_rx_alldev_list;
/* function prototypes for the CAN networklayer procfs (proc.c) */
void can_init_proc(void);
void can_remove_proc(void);
+void can_init_stats(void);
void can_stat_update(unsigned long data);
/* structures and variables from af_can.c needed in proc.c for reading */
diff --git a/net/can/proc.c b/net/can/proc.c
index 1a19b98..438c196 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -86,7 +86,7 @@ static const char rx_list_name[][8] = {
* af_can statistics stuff
*/
-static void can_init_stats(void)
+static void can_reset_stats(void)
{
/*
* This memset function is called from a timer context (when
@@ -104,6 +104,13 @@ static void can_init_stats(void)
}
}
+void can_init_stats(void)
+{
+ memset(&can_pstats, 0, sizeof(can_pstats));
+ memset(&can_stats, 0, sizeof(can_stats));
+ can_stats.jiffies_init = jiffies;
+}
+
static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
unsigned long count)
{
@@ -130,23 +137,23 @@ void can_stat_update(unsigned long data)
/* restart counting in timer context on user request */
if (user_reset)
- can_init_stats();
+ can_reset_stats();
/* restart counting on jiffies overflow */
if (j < can_stats.jiffies_init)
- can_init_stats();
+ can_reset_stats();
/* prevent overflow in calc_rate() */
if (can_stats.rx_frames > (ULONG_MAX / HZ))
- can_init_stats();
+ can_reset_stats();
/* prevent overflow in calc_rate() */
if (can_stats.tx_frames > (ULONG_MAX / HZ))
- can_init_stats();
+ can_reset_stats();
/* matches overflow - very improbable */
if (can_stats.matches > (ULONG_MAX / 100))
- can_init_stats();
+ can_reset_stats();
/* calc total values */
if (can_stats.rx_frames)
@@ -296,7 +303,7 @@ static int can_reset_stats_proc_show(struct seq_file *m, void *v)
} else {
if (can_stats.jiffies_init != jiffies)
- can_init_stats();
+ can_reset_stats();
seq_printf(m, "Performed statistic reset #%ld.\n",
can_pstats.stats_reset);
--
2.8.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] can: add missing initialization of CAN statistics
2016-07-05 17:29 [PATCH] can: add missing initialization of CAN statistics Oliver Hartkopp
@ 2016-07-06 5:55 ` Oliver Hartkopp
0 siblings, 0 replies; 2+ messages in thread
From: Oliver Hartkopp @ 2016-07-06 5:55 UTC (permalink / raw)
To: Marc Kleine-Budde, linux-can
Hi Marc,
as this patch was intended for can-next but based on net I'll send a
rebased version which takes care of the recent changes to the procfs
stuff from Alexander and Arnd.
Best regards,
Oliver
On 07/05/2016 07:29 PM, Oliver Hartkopp wrote:
> The total rx/tx rate (TXR and RXR) only start working after a statistic reset.
> This fix initializes the statistic data structures and the timer init value to
> provide proper values directly from the start.
>
> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
>
> ---
>
> The issue can be fixed by resetting the statistics by hand:
> cat /proc/net/can/reset_stats
>
> As nobody discovered the missing values so far there's no need to put this
> patch to linux stable tree IMO.
> ---
> net/can/af_can.c | 1 +
> net/can/af_can.h | 1 +
> net/can/proc.c | 21 ++++++++++++++-------
> 3 files changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/net/can/af_can.c b/net/can/af_can.c
> index 166d436..df8dcc3 100644
> --- a/net/can/af_can.c
> +++ b/net/can/af_can.c
> @@ -911,6 +911,7 @@ static __init int can_init(void)
> if (!rcv_cache)
> return -ENOMEM;
>
> + can_init_stats();
> if (stats_timer) {
> /* the statistics are updated every second (timer triggered) */
> setup_timer(&can_stattimer, can_stat_update, 0);
> diff --git a/net/can/af_can.h b/net/can/af_can.h
> index fca0fe9..8361047 100644
> --- a/net/can/af_can.h
> +++ b/net/can/af_can.h
> @@ -115,6 +115,7 @@ extern struct dev_rcv_lists can_rx_alldev_list;
> /* function prototypes for the CAN networklayer procfs (proc.c) */
> void can_init_proc(void);
> void can_remove_proc(void);
> +void can_init_stats(void);
> void can_stat_update(unsigned long data);
>
> /* structures and variables from af_can.c needed in proc.c for reading */
> diff --git a/net/can/proc.c b/net/can/proc.c
> index 1a19b98..438c196 100644
> --- a/net/can/proc.c
> +++ b/net/can/proc.c
> @@ -86,7 +86,7 @@ static const char rx_list_name[][8] = {
> * af_can statistics stuff
> */
>
> -static void can_init_stats(void)
> +static void can_reset_stats(void)
> {
> /*
> * This memset function is called from a timer context (when
> @@ -104,6 +104,13 @@ static void can_init_stats(void)
> }
> }
>
> +void can_init_stats(void)
> +{
> + memset(&can_pstats, 0, sizeof(can_pstats));
> + memset(&can_stats, 0, sizeof(can_stats));
> + can_stats.jiffies_init = jiffies;
> +}
> +
> static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
> unsigned long count)
> {
> @@ -130,23 +137,23 @@ void can_stat_update(unsigned long data)
>
> /* restart counting in timer context on user request */
> if (user_reset)
> - can_init_stats();
> + can_reset_stats();
>
> /* restart counting on jiffies overflow */
> if (j < can_stats.jiffies_init)
> - can_init_stats();
> + can_reset_stats();
>
> /* prevent overflow in calc_rate() */
> if (can_stats.rx_frames > (ULONG_MAX / HZ))
> - can_init_stats();
> + can_reset_stats();
>
> /* prevent overflow in calc_rate() */
> if (can_stats.tx_frames > (ULONG_MAX / HZ))
> - can_init_stats();
> + can_reset_stats();
>
> /* matches overflow - very improbable */
> if (can_stats.matches > (ULONG_MAX / 100))
> - can_init_stats();
> + can_reset_stats();
>
> /* calc total values */
> if (can_stats.rx_frames)
> @@ -296,7 +303,7 @@ static int can_reset_stats_proc_show(struct seq_file *m, void *v)
>
> } else {
> if (can_stats.jiffies_init != jiffies)
> - can_init_stats();
> + can_reset_stats();
>
> seq_printf(m, "Performed statistic reset #%ld.\n",
> can_pstats.stats_reset);
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-07-06 5:55 ` Oliver Hartkopp
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