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

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Date:   Mon, 9 May 2022 13:10:42 -0700
From:   Brian Vazquez <brianvv@...gle.com>
To:     Jeffrey Ji <jeffreyjilinux@...il.com>
Cc:     David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Eric Dumazet <edumazet@...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

Hey Jeffrey, thanks for working on this, some comments:

I think you meant iproute2-next in the subject. Could you resend, please?

On Mon, May 9, 2022 at 12:18 PM Jeffrey Ji <jeffreyjilinux@...il.com> 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;
>  };
>
>  /* 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"),
>         };
>         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",
I think you're missing a space in the line above (but code shouldn't
be here, see my comment below)
>                         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_);
rx_otherhost_dropped code should be below in the "RX error stats" not
here, it should be after the rx_nohandler stat. Also IIUC, the code
should be:
  cols[7], s->rx_otherhost_dropped? "otherhost_dropped" : "",

>
>                 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
>