netdev - Re: [PATCH net-next] show rx_otherhost

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Date:   Tue, 10 May 2022 10:09:19 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Jeffrey Ji <jeffreyjilinux@...il.com>
Cc:     David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Brian Vazquez <brianvv@...gle.com>, netdev@...r.kernel.org,
        Jeffrey Ji <jeffreyji@...gle.com>
Subject: Re: [PATCH net-next] show rx_otherhost_dropped stat in ip link show

On Mon, May 09, 2022 at 07:18:10PM +0000, Jeffrey Ji wrote:
> From: Jeffrey Ji <jeffreyji@...gle.com>
> 
> This stat was added in commit 794c24e9921f ("net-core: rx_otherhost_dropped to core_stats")
> 
> Tested: sent packet with wrong MAC address from 1
> network namespace to another, verified that counter showed "1" in
> `ip -s -s link sh` and `ip -s -s -j link sh`
> 
> Signed-off-by: Jeffrey Ji <jeffreyji@...gle.com>
> ---
>  include/uapi/linux/if_link.h |  2 ++
>  ip/ipaddress.c               | 15 +++++++++++++--
>  2 files changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> index 22e21e57afc9..50477985bfea 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -243,6 +243,8 @@ struct rtnl_link_stats64 {
>  	__u64	rx_compressed;
>  	__u64	tx_compressed;
>  	__u64	rx_nohandler;
> +
> +	__u64	rx_otherhost_dropped;

I believe you need to rebase against current iproute2-next. The kernel
headers are already updated there. This tree:
https://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git

>  };
>  
>  /* Subset of link stats useful for in-HW collection. Meaning of the fields is as
> diff --git a/ip/ipaddress.c b/ip/ipaddress.c
> index a80996efdc28..9d6af56e2a72 100644
> --- a/ip/ipaddress.c
> +++ b/ip/ipaddress.c
> @@ -692,6 +692,7 @@ static void __print_link_stats(FILE *fp, struct rtattr *tb[])
>  		strlen("heartbt"),
>  		strlen("overrun"),
>  		strlen("compressed"),
> +		strlen("otherhost_dropped"),

There were a lot of changes in this area as part of the "ip stats"
work. See print_stats64() in current iproute2-next.

>  	};
>  	int ret;
>  
> @@ -713,6 +714,10 @@ static void __print_link_stats(FILE *fp, struct rtattr *tb[])
>  		if (s->rx_compressed)
>  			print_u64(PRINT_JSON,
>  				   "compressed", NULL, s->rx_compressed);
> +		if (s->rx_otherhost_dropped)
> +			print_u64(PRINT_JSON,
> +				   "otherhost_dropped",
> +				   NULL, s->rx_otherhost_dropped);
>  
>  		/* RX error stats */
>  		if (show_stats > 1) {
> @@ -795,11 +800,15 @@ static void __print_link_stats(FILE *fp, struct rtattr *tb[])
>  				     rta_getattr_u32(carrier_changes) : 0);
>  
>  		/* RX stats */
> -		fprintf(fp, "    RX: %*s %*s %*s %*s %*s %*s %*s%s",
> +		fprintf(fp, "    RX: %*s %*s %*s %*s %*s %*s %*s%*s%s",
>  			cols[0] - 4, "bytes", cols[1], "packets",
>  			cols[2], "errors", cols[3], "dropped",
>  			cols[4], "missed", cols[5], "mcast",
> -			cols[6], s->rx_compressed ? "compressed" : "", _SL_);
> +			s->rx_compressed ? cols[6] : 0,
> +			s->rx_compressed ? "compressed " : "",
> +			s->rx_otherhost_dropped ? cols[7] : 0,
> +			s->rx_otherhost_dropped ? "otherhost_dropped" : "",
> +			_SL_);
>  
>  		fprintf(fp, "    ");
>  		print_num(fp, cols[0], s->rx_bytes);
> @@ -810,6 +819,8 @@ static void __print_link_stats(FILE *fp, struct rtattr *tb[])
>  		print_num(fp, cols[5], s->multicast);
>  		if (s->rx_compressed)
>  			print_num(fp, cols[6], s->rx_compressed);
> +		if (s->rx_otherhost_dropped)
> +			print_num(fp, cols[7], s->rx_otherhost_dropped);
>  
>  		/* RX error stats */
>  		if (show_stats > 1) {
> -- 
> 2.36.0.512.ge40c2bad7a-goog
>