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

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Message-ID: <20200904010924.m7h434gms27a3r77@ast-mbp.dhcp.thefacebook.com>
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?