linux-kernel - Re: [PATCH 2/2] iproute2: add support for invisible qdisc dumping

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Message-ID: <20170227115218.GO6099@orbyte.nwl.cc>
Date:   Mon, 27 Feb 2017 12:52:18 +0100
From:   Phil Sutter <phil@....cc>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] iproute2: add support for invisible qdisc dumping

On Sat, Feb 25, 2017 at 10:29:17PM +0100, Jiri Kosina wrote:
> From: Jiri Kosina <jkosina@...e.cz>
> 
> Support the new TCA_DUMP_INVISIBLE netlink attribute that allows asking 
> kernel to perform 'full qdisc dump', as for historical reasons some of the 
> default qdiscs are being hidden by the kernel.
> 
> The command syntax is being extended by voluntary 'invisible' argument to
> 'tc qdisc show'.
> 
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>
> ---
>  tc/tc_qdisc.c | 25 +++++++++++++++++++++++--
>  1 file changed, 23 insertions(+), 2 deletions(-)

Would you mind adding a description of the new keyword to tc man page as
well?

> diff --git a/tc/tc_qdisc.c b/tc/tc_qdisc.c
> index 3a3701c2..29da9269 100644
> --- a/tc/tc_qdisc.c
> +++ b/tc/tc_qdisc.c
> @@ -34,7 +34,7 @@ static int usage(void)
>  	fprintf(stderr, "       [ stab [ help | STAB_OPTIONS] ]\n");
>  	fprintf(stderr, "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n");
>  	fprintf(stderr, "\n");
> -	fprintf(stderr, "       tc qdisc show [ dev STRING ] [ ingress | clsact ]\n");
> +	fprintf(stderr, "       tc qdisc show [ dev STRING ] [ ingress | clsact | invisible ]\n");

Doesn't look like these are mutually exclusive. Therefore I would
suggest fixing the syntax to:

| +	fprintf(stderr, "       tc qdisc show [ dev STRING ] [ ingress | clsact ] [ invisible ]\n");

Cheers, Phil