linux-kernel - Re: [PATCH] xfrm: kconfig: Fix XFRM

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Message-ID: <CA+5LGR2oDFEjJL5j715Pi9AtmJ7LXM82a63+rcyYow-E5trXtg@mail.gmail.com>
Date:   Tue, 25 Jul 2023 12:11:06 +0300
From:   Ilia Lin <ilia.lin@...il.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Ilia Lin <ilia.lin@...nel.org>, steffen.klassert@...unet.com,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        jeffrey.t.kirsher@...el.com
Subject: Re: [PATCH] xfrm: kconfig: Fix XFRM_OFFLOAD dependency on XFRM

On Tue, Jul 25, 2023 at 8:19 AM Leon Romanovsky <leon@...nel.org> wrote:
>
> On Tue, Jul 25, 2023 at 07:41:49AM +0300, Ilia Lin wrote:
> > Hi Leon,
>
> You was already asked do not top-post.
> https://lore.kernel.org/netdev/20230718105446.GD8808@unreal/
> Please stop it.
>
> >
> > This is exactly like I described:
> > * xfrm.h is included from the net/core/sock.c unconditionally.
> > * If CONFIG_XFRM_OFFLOAD is set, then the xfrm_dst_offload_ok() is
> > being compiled.
> > * If CONFIG_XFRM is not set, the struct dst_entry doesn't have the xfrm member.
> > * xfrm_dst_offload_ok() tries to access the dst->xfrm and that fails to compile.
>
> I asked two questions. First one was "How did you set XFRM_OFFLOAD
> without XFRM?".
>
> Thanks
>
In driver Kconfig: "select XFRM_OFFLOAD"
>
> >
> >
> > Thanks,
> > Ilia Lin
> >
> > On Mon, Jul 24, 2023 at 9:11 PM Leon Romanovsky <leon@...nel.org> wrote:
> > >
> > > On Mon, Jul 24, 2023 at 12:00:44PM +0300, Ilia Lin wrote:
> > > > If XFRM_OFFLOAD is configured, but XFRM is not
> > >
> > > How did you do it?
> > >
> > > >, it will cause
> > > > compilation error on include xfrm.h:
> > > >  C 05:56:39 In file included from /src/linux/kernel_platform/msm-kernel/net/core/sock.c:127:
> > > >  C 05:56:39 /src/linux/kernel_platform/msm-kernel/include/net/xfrm.h:1932:30: error: no member named 'xfrm' in 'struct dst_entry'
> > > >  C 05:56:39         struct xfrm_state *x = dst->xfrm;
> > > >  C 05:56:39                                ~~~  ^
> > > >
> > > > Making the XFRM_OFFLOAD select the XFRM.
> > > >
> > > > Fixes: 48e01e001da31 ("ixgbe/ixgbevf: fix XFRM_ALGO dependency")
> > > > Reported-by: Ilia Lin <ilia.lin@...nel.org>
> > > > Signed-off-by: Ilia Lin <ilia.lin@...nel.org>
> > > > ---
> > > >  net/xfrm/Kconfig | 1 +
> > > >  1 file changed, 1 insertion(+)
> > > >
> > > > diff --git a/net/xfrm/Kconfig b/net/xfrm/Kconfig
> > > > index 3adf31a83a79a..3fc2c1bcb5bbe 100644
> > > > --- a/net/xfrm/Kconfig
> > > > +++ b/net/xfrm/Kconfig
> > > > @@ -10,6 +10,7 @@ config XFRM
> > > >
> > > >  config XFRM_OFFLOAD
> > > >       bool
> > > > +     select XFRM
> > >
> > > struct dst_entry depends on CONFIG_XFRM and not on CONFIG_XFRM_OFFLOAD,
> > > so it is unclear to me why do you need to add new "select XFRM" line.
> > >
> > >    26 struct dst_entry {
> > >    27         struct net_device       *dev;
> > >    28         struct  dst_ops         *ops;
> > >    29         unsigned long           _metrics;
> > >    30         unsigned long           expires;
> > >    31 #ifdef CONFIG_XFRM
> > >    32         struct xfrm_state       *xfrm;
> > >    33 #else
> > >    34         void                    *__pad1;
> > >    35 #endif
> > >    36         int
> > >
> > > Thanks