netdev - Re: [PATCH v2 net-next 6/9] bpf: helpers: add bpf_xdp_adjust_mb

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Message-ID: <20200904080729.GE2884@lore-desk>
Date:   Fri, 4 Sep 2020 10:07:29 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, davem@...emloft.net,
        lorenzo.bianconi@...hat.com, brouer@...hat.com,
        echaudro@...hat.com, sameehj@...zon.com, kuba@...nel.org,
        john.fastabend@...il.com, daniel@...earbox.net, ast@...nel.org,
        shayagr@...zon.com
Subject: Re: [PATCH v2 net-next 6/9] bpf: helpers: add
 bpf_xdp_adjust_mb_header helper

On Sep 03, Alexei Starovoitov wrote:
> On Thu, Sep 03, 2020 at 10:58:50PM +0200, Lorenzo Bianconi wrote:
> > Introduce bpf_xdp_adjust_mb_header helper in order to adjust frame
> > headers moving *offset* bytes from/to the second buffer to/from the
> > first one.
> > This helper can be used to move headers when the hw DMA SG is not able
> > to copy all the headers in the first fragment and split header and data
> > pages.
> > 
> > Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> > ---
> >  include/uapi/linux/bpf.h       | 25 ++++++++++++----
> >  net/core/filter.c              | 54 ++++++++++++++++++++++++++++++++++
> >  tools/include/uapi/linux/bpf.h | 26 ++++++++++++----
> >  3 files changed, 95 insertions(+), 10 deletions(-)
> > 
> > diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> > index 8dda13880957..c4a6d245619c 100644
> > --- a/include/uapi/linux/bpf.h
> > +++ b/include/uapi/linux/bpf.h
> > @@ -3571,11 +3571,25 @@ union bpf_attr {
> >   *		value.
> >   *
> >   * long bpf_copy_from_user(void *dst, u32 size, const void *user_ptr)
> > - * 	Description
> > - * 		Read *size* bytes from user space address *user_ptr* and store
> > - * 		the data in *dst*. This is a wrapper of copy_from_user().
> > - * 	Return
> > - * 		0 on success, or a negative error in case of failure.
> > + *	Description
> > + *		Read *size* bytes from user space address *user_ptr* and store
> > + *		the data in *dst*. This is a wrapper of copy_from_user().
> > + *
> > + * long bpf_xdp_adjust_mb_header(struct xdp_buff *xdp_md, int offset)
> 
> botched rebase?

Yes, sorry. I will fix in v3.

Regards,
Lorenzo

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