netdev - Re: [PATCH 6/8] socket: Add struct sock

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Message-ID: <CABeXuvrV+xN3O8BSmJ7bGR+8uYmtrCk2YL37HQZrBSO8YSvzJQ@mail.gmail.com>
Date:   Sat, 24 Nov 2018 20:52:08 -0800
From:   Deepa Dinamani <deepa.kernel@...il.com>
To:     willemdebruijn.kernel@...il.com
Cc:     "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Network Devel Mailing List <netdev@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        y2038 Mailman List <y2038@...ts.linaro.org>
Subject: Re: [PATCH 6/8] socket: Add struct sock_timeval

On Sat, Nov 24, 2018 at 11:38 AM Willem de Bruijn
<willemdebruijn.kernel@...il.com> wrote:
>
> On Sat, Nov 24, 2018 at 4:00 AM Deepa Dinamani <deepa.kernel@...il.com> wrote:
> >
> > The new type is meant to be used as a y2038 safe structure
> > to be used as part of cmsg data.
> > Presently the SO_TIMESTAMP socket option uses struct timeval
> > for timestamps. This is not y2038 safe.
> > Subsequent patches in the series add new y2038 safe socket
> > option to be used in the place of SO_TIMESTAMP_OLD.
> > struct sock_timeval will be used as the timestamp format
> > at that time.
> >
> > struct sock_timeval also maintains the same layout across
> > 32 bit and 64 bit ABIs.
> >
> > Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
> > ---
> >  include/uapi/linux/time.h | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/include/uapi/linux/time.h b/include/uapi/linux/time.h
> > index 04d5587f30d3..106f9398c285 100644
> > --- a/include/uapi/linux/time.h
> > +++ b/include/uapi/linux/time.h
> > @@ -70,6 +70,11 @@ struct __kernel_old_timeval {
> >  };
> >  #endif
> >
> > +struct sock_timeval {
> > +       long long tv_sec;
> > +       long long tv_usec;
>
> should these use fixed-width type __u64?

We have avoided using __u64/__s64 types for time types in uapi.
I think we did this for portability reasons.
Although this new type might not be required to be interpreted in
libc, I would prefer for this to be long long.
If there is a strong preference then I can change it.

-Deepa