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@xxxxxxxxxx>
> > ---
> > 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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