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 <lore...@kernel.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?
