netdev - Re: [PATCH v3 net-next 06/12] bpf: helpers: add multibuffer support

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Message-ID: <20200930191121.jm62rlopekegbjx5@ast-mbp.dhcp.thefacebook.com>
Date:   Wed, 30 Sep 2020 12:11:21 -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,
        sameehj@...zon.com, kuba@...nel.org, john.fastabend@...il.com,
        daniel@...earbox.net, ast@...nel.org, shayagr@...zon.com,
        brouer@...hat.com, echaudro@...hat.com,
        lorenzo.bianconi@...hat.com, dsahern@...nel.org
Subject: Re: [PATCH v3 net-next 06/12] bpf: helpers: add multibuffer support

On Wed, Sep 30, 2020 at 05:41:57PM +0200, Lorenzo Bianconi wrote:
> From: Sameeh Jubran <sameehj@...zon.com>
> 
> The implementation is based on this [0] draft by Jesper D. Brouer.
> 
> Provided two new helpers:
> 
> * bpf_xdp_get_frag_count()
> * bpf_xdp_get_frags_total_size()
> 
> [0] xdp mb design - https://github.com/xdp-project/xdp-project/blob/master/areas/core/xdp-multi-buffer01-design.org
> Signed-off-by: Sameeh Jubran <sameehj@...zon.com>
> Co-developed-by: Lorenzo Bianconi <lorenzo@...nel.org>
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  include/uapi/linux/bpf.h       | 14 ++++++++++++
>  net/core/filter.c              | 42 ++++++++++++++++++++++++++++++++++
>  tools/include/uapi/linux/bpf.h | 14 ++++++++++++
>  3 files changed, 70 insertions(+)
> 
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index a22812561064..6f97dce8cccf 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -3586,6 +3586,18 @@ union bpf_attr {
>   * 		the data in *dst*. This is a wrapper of **copy_from_user**\ ().
>   * 	Return
>   * 		0 on success, or a negative error in case of failure.
> + *
> + * int bpf_xdp_get_frag_count(struct xdp_buff *xdp_md)
> + *	Description
> + *		Get the number of fragments for a given xdp multi-buffer.
> + *	Return
> + *		The number of fragments
> + *
> + * int bpf_xdp_get_frags_total_size(struct xdp_buff *xdp_md)
> + *	Description
> + *		Get the total size of fragments for a given xdp multi-buffer.
> + *	Return
> + *		The total size of fragments for a given xdp multi-buffer.
>   */
>  #define __BPF_FUNC_MAPPER(FN)		\
>  	FN(unspec),			\
> @@ -3737,6 +3749,8 @@ union bpf_attr {
>  	FN(inode_storage_delete),	\
>  	FN(d_path),			\
>  	FN(copy_from_user),		\
> +	FN(xdp_get_frag_count),		\
> +	FN(xdp_get_frags_total_size),	\
>  	/* */

Please route the set via bpf-next otherwise merge conflicts will be severe.