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Message-ID: <20090106195408.51cd3810@extreme>
Date: Tue, 6 Jan 2009 19:54:08 -0800
From: Stephen Hemminger <shemminger@...tta.com>
To: "Huascar Tejeda" <htejeda@...il.com>
Cc: "Rick Jones" <rick.jones2@...com>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: reset network device counters on the fly
On Tue, 6 Jan 2009 23:17:57 -0400
"Huascar Tejeda" <htejeda@...il.com> wrote:
> Thanks a lot for your reply and sorry for sending the patch as an
> attachment; Anyway, here is the patch in case someone finds it useful.
You need to follow the required format (see Documentation/SubmittingPatches).
Patch is not properly based and does not have certificate of origin.
Also for first time submitters I recommend using the script scripts/checkpatch.pl
to make sure there are no style issues:
ERROR: trailing whitespace
#90: FILE: core/dev.c:2680:
+/*^I$
ERROR: patch seems to be corrupt (line wrapped?)
#94: FILE: core/dev.c:2683:
*buffer, size_t len, loff_t * off)
WARNING: unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html
#101: FILE: core/dev.c:2690:
+ char **argv = (char **) kmalloc(sizeof(char *), GFP_KERNEL);
WARNING: line over 80 characters
#105: FILE: core/dev.c:2694:
+ cmd_size = ( len > RSTDEV_COMMAND_MAX_SIZE ) ? RSTDEV_COMMAND_MAX_SIZE : len;
ERROR: space prohibited after that open parenthesis '('
#105: FILE: core/dev.c:2694:
+ cmd_size = ( len > RSTDEV_COMMAND_MAX_SIZE ) ? RSTDEV_COMMAND_MAX_SIZE : len;
ERROR: space prohibited before that close parenthesis ')'
#105: FILE: core/dev.c:2694:
+ cmd_size = ( len > RSTDEV_COMMAND_MAX_SIZE ) ? RSTDEV_COMMAND_MAX_SIZE : len;
ERROR: space prohibited after that open parenthesis '('
#106: FILE: core/dev.c:2695:
+ if ( copy_from_user(cmd, buffer, cmd_size) ) {
ERROR: space prohibited before that close parenthesis ')'
#106: FILE: core/dev.c:2695:
+ if ( copy_from_user(cmd, buffer, cmd_size) ) {
WARNING: braces {} are not necessary for single statement blocks
#106: FILE: core/dev.c:2695:
+ if ( copy_from_user(cmd, buffer, cmd_size) ) {
+ return -EFAULT;
+ }
ERROR: do not use C99 // comments
#110: FILE: core/dev.c:2699:
+ //Parse user input
ERROR: space prohibited after that open parenthesis '('
#111: FILE: core/dev.c:2700:
+ while ( (tmp_token = strsep(&cmd_ptr, " \n")) ) {
ERROR: space prohibited before that close parenthesis ')'
#111: FILE: core/dev.c:2700:
+ while ( (tmp_token = strsep(&cmd_ptr, " \n")) ) {
ERROR: space prohibited after that open parenthesis '('
#112: FILE: core/dev.c:2701:
+ if ( *tmp_token ) {
ERROR: space prohibited before that close parenthesis ')'
#112: FILE: core/dev.c:2701:
+ if ( *tmp_token ) {
WARNING: unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html
#113: FILE: core/dev.c:2702:
+ argv[argc] = (char *) kmalloc((strlen(tmp_token) + 1) *
ERROR: space prohibited after that open parenthesis '('
#119: FILE: core/dev.c:2707:
+ if ( !argv[0] || !argv[1] ) {
ERROR: space prohibited before that close parenthesis ')'
#119: FILE: core/dev.c:2707:
+ if ( !argv[0] || !argv[1] ) {
ERROR: trailing whitespace
#128: FILE: core/dev.c:2715:
+^I$
WARNING: line over 80 characters
#136: FILE: core/dev.c:2723:
+ memset(stats, 0, sizeof(struct net_device_stats));
WARNING: line over 80 characters
#144: FILE: core/dev.c:2731:
+ memset(stats, 0, sizeof(struct net_device_stats));
WARNING: line over 80 characters
#147: FILE: core/dev.c:2734:
+ printk(KERN_INFO "Device %s not found!\n", ifname);
ERROR: need consistent spacing around '%' (ctx:WxV)
#147: FILE: core/dev.c:2734:
+ printk(KERN_INFO "Device %s not found!\n", ifname);
^
ERROR: space required before that '!' (ctx:VxV)
#147: FILE: core/dev.c:2734:
+ printk(KERN_INFO "Device %s not found!\n", ifname);
^
ERROR: code indent should use tabs where possible
#163: FILE: core/dev.c:2750:
+ .write = reset_device_counters,$
ERROR: Missing Signed-off-by: line(s)
total: 18 errors, 7 warnings, 92 lines checked
/tmp/cntr.patch has style problems, please review. If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.
> --- net/core/dev.c.orig 2009-01-05 17:38:51.000000000 -0400
> +++ net/core/dev.c 2009-01-06 16:36:35.000000000 -0400
> @@ -161,6 +161,11 @@
> #define PTYPE_HASH_SIZE (16)
> #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
>
> +/*
> + * Maximum length of the command sent by the user
> + */
> +#define RSTDEV_COMMAND_MAX_SIZE (15)
> +
> static DEFINE_SPINLOCK(ptype_lock);
> static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
> static struct list_head ptype_all __read_mostly; /* Taps */
> @@ -2671,10 +2676,78 @@
> sizeof(struct seq_net_private));
> }
>
> +
> +/*
> + * Called when /proc/net/dev is written
> + */
> +static ssize_t reset_device_counters(struct file *file, const char
> *buffer, size_t len, loff_t * off)
> +{
> + struct net_device *dev;
> + struct net_device_stats *stats;
> + char cmd[RSTDEV_COMMAND_MAX_SIZE];
> + unsigned long cmd_size = 0;
> + char *cmd_ptr = cmd;
> + char **argv = (char **) kmalloc(sizeof(char *), GFP_KERNEL);
> + char *tmp_token, *action, *ifname;
> + int argc = 0;
> +
> + cmd_size = ( len > RSTDEV_COMMAND_MAX_SIZE ) ? RSTDEV_COMMAND_MAX_SIZE : len;
> + if ( copy_from_user(cmd, buffer, cmd_size) ) {
> + return -EFAULT;
> + }
> +
> + //Parse user input
Useless comment and it is C++ format
> + while ( (tmp_token = strsep(&cmd_ptr, " \n")) ) {
> + if ( *tmp_token ) {
> + argv[argc] = (char *) kmalloc((strlen(tmp_token) + 1) *
> sizeof(char), GFP_KERNEL);
> + strcpy(argv[argc++], tmp_token);
> + }
> + }
> +
> + if ( !argv[0] || !argv[1] ) {
> + printk(KERN_INFO "Please usage: reset \"[network interface]\" or
> \"reset all\"\n");
> + return -EINVAL;
> + }
> +
> + //TODO: create a struct for this.
> + action = argv[0];
> + ifname = argv[1];
> +
> + kfree(argv);
> +
> + if ( strstr(action, "reset") ) {
> + if ( !strcmp(ifname, "all") ) {
> + for_each_netdev(&init_net, dev) {
Action should take place in network namespace of the caller
> + stats = dev->get_stats(dev);
The stat structure in the device is not changeable. Many devices regenerate
it on each call.
> + if ( stats ) {
> + memset(stats, 0, sizeof(struct net_device_stats));
> + }
> + }
> + } else {
> + dev = dev_get_by_name(&init_net, ifname);
> + if ( dev ) {
> + stats = dev->get_stats(dev);
> + if ( stats ) {
> + memset(stats, 0, sizeof(struct net_device_stats));
> + }
> + } else {
> + printk(KERN_INFO "Device %s not found!\n", ifname);
> + return -ENODEV;
> + }
> + }
> + } else {
> + printk(KERN_INFO "\"reset\" is the only supported command!\n");
> + return -EINVAL;
> + }
> +
> + return cmd_size;
> +}
--
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