netdev - Re: [PATCH iproute2-next] tc: full JSON support for 'bpf' actions

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Date:   Wed, 06 Feb 2019 10:14:09 +0100
From:   Davide Caratti <dcaratti@...hat.com>
To:     David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next] tc: full JSON support for 'bpf' actions

On Tue, 2019-02-05 at 14:59 -0800, David Ahern wrote:
> On 2/5/19 2:53 PM, Stephen Hemminger wrote:
> > On Thu, 31 Jan 2019 18:58:09 +0100
> > Davide Caratti <dcaratti@...hat.com> wrote:
> > 
> > > +		print_uint(PRINT_ANY, "code", "%hu ", ops[i].code);
> > > +		print_uint(PRINT_ANY, "jt", "%hhu ", ops[i].jt);
> > > +		print_uint(PRINT_ANY, "jf", "%hhu ", ops[i].jf);
> > 
> > Did you know that print_uint promotes the argument to unsigned int

this happens frequently in iproute2 code,

> > then you are printing it with %hhu which expects only a u8.

but indeed, %hu and %hhu made the former cast just useless: thanks for
noticing.

> I did look at the print_hhu option and it seems really weird that you
> use "print_hhu(..., "%hhu", ...)" which is why I took the patch as is.
> There are existing examples of print_uint with '%hu' too.
> The print_ functions really should be renamed (print_uchar,
> print_ushort, etc).

maybe this can be done more reliably with an automatic tool, like
coccinelle. There are only 5 lines with the print_uint(...
"%hu" ...) pattern, so this can be uniformed easily with a small patch.

-- 
davide