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Date: Thu, 17 Dec 2015 17:14:21 -0800
From: Stephen Hemminger <shemming@...cade.com>
To: Phil Sutter <phil@....cc>
CC: <netdev@...r.kernel.org>
Subject: Re: [iproute PATCH] ip{,6}tunnel: have a shared stats
parser/printer
On Fri, 11 Dec 2015 13:23:44 +0100
Phil Sutter <phil@....cc> wrote:
> This has a slight side-effect of not aborting when /proc/net/dev is
> malformed, but OTOH stats are not parsed for uninteresting interfaces.
>
> Signed-off-by: Phil Sutter <phil@....cc>
> ---
> ip/ip6tunnel.c | 21 ++-------------------
> ip/iptunnel.c | 21 ++-------------------
> ip/tunnel.c | 28 ++++++++++++++++++++++++++++
> ip/tunnel.h | 1 +
> 4 files changed, 33 insertions(+), 38 deletions(-)
>
> diff --git a/ip/ip6tunnel.c b/ip/ip6tunnel.c
> index 1737d884319ec..7a3cd0461fff1 100644
> --- a/ip/ip6tunnel.c
> +++ b/ip/ip6tunnel.c
> @@ -341,10 +341,6 @@ static int do_tunnels_list(struct ip6_tnl_parm2 *p)
> while (fgets(buf, sizeof(buf), fp) != NULL) {
> char name[IFNAMSIZ];
> int index, type;
> - unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
> - rx_fifo, rx_frame,
> - tx_bytes, tx_packets, tx_errs, tx_drops,
> - tx_fifo, tx_colls, tx_carrier, rx_multi;
> struct ip6_tnl_parm2 p1;
> char *ptr;
>
> @@ -354,12 +350,6 @@ static int do_tunnels_list(struct ip6_tnl_parm2 *p)
> fprintf(stderr, "Wrong format for /proc/net/dev. Giving up.\n");
> goto end;
> }
> - if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
> - &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
> - &rx_fifo, &rx_frame, &rx_multi,
> - &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
> - &tx_fifo, &tx_colls, &tx_carrier) != 14)
> - continue;
> if (p->name[0] && strcmp(p->name, name))
> continue;
> index = ll_name_to_index(name);
> @@ -385,15 +375,8 @@ static int do_tunnels_list(struct ip6_tnl_parm2 *p)
> if (!ip6_tnl_parm_match(p, &p1))
> continue;
> print_tunnel(&p1);
> - if (show_stats) {
> - printf("%s", _SL_);
> - printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
> - printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
> - rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
> - printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_);
> - printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
> - tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
> - }
> + if (show_stats)
> + tnl_print_stats(ptr);
> printf("\n");
> }
> err = 0;
> diff --git a/ip/iptunnel.c b/ip/iptunnel.c
> index a3ff99bd87eb8..65a4e6e9c1a5a 100644
> --- a/ip/iptunnel.c
> +++ b/ip/iptunnel.c
> @@ -405,10 +405,6 @@ static int do_tunnels_list(struct ip_tunnel_parm *p)
> while (fgets(buf, sizeof(buf), fp) != NULL) {
> char name[IFNAMSIZ];
> int index, type;
> - unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
> - rx_fifo, rx_frame,
> - tx_bytes, tx_packets, tx_errs, tx_drops,
> - tx_fifo, tx_colls, tx_carrier, rx_multi;
> struct ip_tunnel_parm p1;
> char *ptr;
>
> @@ -419,12 +415,6 @@ static int do_tunnels_list(struct ip_tunnel_parm *p)
> fprintf(stderr, "Wrong format for /proc/net/dev. Giving up.\n");
> goto end;
> }
> - if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
> - &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
> - &rx_fifo, &rx_frame, &rx_multi,
> - &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
> - &tx_fifo, &tx_colls, &tx_carrier) != 14)
> - continue;
> if (p->name[0] && strcmp(p->name, name))
> continue;
> index = ll_name_to_index(name);
> @@ -447,15 +437,8 @@ static int do_tunnels_list(struct ip_tunnel_parm *p)
> (p->i_key && p1.i_key != p->i_key))
> continue;
> print_tunnel(&p1);
> - if (show_stats) {
> - printf("%s", _SL_);
> - printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
> - printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
> - rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
> - printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_);
> - printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
> - tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
> - }
> + if (show_stats)
> + tnl_print_stats(ptr);
> printf("\n");
> }
> err = 0;
> diff --git a/ip/tunnel.c b/ip/tunnel.c
> index 79f2201f2356f..1dd809227fed4 100644
> --- a/ip/tunnel.c
> +++ b/ip/tunnel.c
> @@ -195,3 +195,31 @@ __be32 tnl_parse_key(const char *name, const char *key)
> }
> return htonl(uval);
> }
> +
> +/* tnl_print_stats - print tunnel statistics
> + *
> + * @buf - tunnel interface's line in /proc/net/dev,
> + * starting past the interface name and following colon
> + */
> +void tnl_print_stats(const char *buf)
> +{
> + unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
> + rx_fifo, rx_frame,
> + tx_bytes, tx_packets, tx_errs, tx_drops,
> + tx_fifo, tx_colls, tx_carrier, rx_multi;
> +
> + if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
> + &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
> + &rx_fifo, &rx_frame, &rx_multi,
> + &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
> + &tx_fifo, &tx_colls, &tx_carrier) != 14)
> + return;
> +
> + printf("%s", _SL_);
> + printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
> + printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
> + rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
> + printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_);
> + printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
> + tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
> +}
> diff --git a/ip/tunnel.h b/ip/tunnel.h
> index 9fb4a186176fa..9a03c0d7756e3 100644
> --- a/ip/tunnel.h
> +++ b/ip/tunnel.h
> @@ -32,5 +32,6 @@ int tnl_prl_ioctl(int cmd, const char *name, void *p);
> int tnl_6rd_ioctl(int cmd, const char *name, void *p);
> int tnl_ioctl_get_6rd(const char *name, void *p);
> __be32 tnl_parse_key(const char *name, const char *key);
> +void tnl_print_stats(const char *buf);
>
> #endif
I just fixed the sscanf formats and after that this patch caused build error.
tunnel.c: In function ‘tnl_print_stats’:
tunnel.c:211:13: error: ‘ptr’ undeclared (first use in this function)
if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
^
tunnel.c:211:13: note: each undeclared identifier is reported only once for each function it appears in
<builtin>: recipe for target 'tunnel.o' failed
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