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Date: Thu, 3 Sep 2020 18:09:24 -0700 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Lorenzo Bianconi <lorenzo@...nel.org> 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 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?
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