linux-kernel - Re: xfrm4_state_afinfo size increase (was: Re: xfrm: Add a xfrm type offload.)

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Date:   Thu, 4 May 2017 11:16:40 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: xfrm4_state_afinfo size increase (was: Re: xfrm: Add a xfrm type
 offload.)

On Thu, May 04, 2017 at 10:08:07AM +0200, Geert Uytterhoeven wrote:
> > @@ -314,12 +316,14 @@ void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
> >  int __xfrm_state_delete(struct xfrm_state *x);
> >
> >  struct xfrm_state_afinfo {
> > -       unsigned int            family;
> > -       unsigned int            proto;
> > -       __be16                  eth_proto;
> > -       struct module           *owner;
> > -       const struct xfrm_type  *type_map[IPPROTO_MAX];
> > -       struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
> > +       unsigned int                    family;
> > +       unsigned int                    proto;
> > +       __be16                          eth_proto;
> > +       struct module                   *owner;
> > +       const struct xfrm_type          *type_map[IPPROTO_MAX];
> > +       const struct xfrm_type_offload  *type_offload_map[IPPROTO_MAX];
> > +       struct xfrm_mode                *mode_map[XFRM_MODE_MAX];
> 
> Bloat-o-meter reports the addition of xfrm_state_afinfo.type_offload_map[]
> increases the static kernel size by 1 KiB on 32-bit platforms (double on 64-bit
> platforms):
> 
> function                                     old     new   delta
>     xfrm4_state_afinfo                          1102    2126   +1024
> 
> While IPPROTO_MAX = 256, the defined list of IP protocols is spread
> sparsely over the number space, but I assume all values may occur?

Actually no, I think we could boil this down to less than ten
really used protocols by mapping the IPPROTO numbers to some
XFRMPROTO numbers.

I'll look into this.

Thanks!