netdev - Re: [PATCH v3 bpf-next 1/5] devmap: Formalize map value as a named struct

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Message-ID: <20200529102256.22dd50da@carbon>
Date:   Fri, 29 May 2020 10:22:56 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     David Ahern <dsahern@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, davem@...emloft.net,
        kuba@...nel.org, toke@...hat.com, lorenzo@...nel.org,
        daniel@...earbox.net, john.fastabend@...il.com, ast@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com, andriin@...com,
        dsahern@...il.com, brouer@...hat.com
Subject: Re: [PATCH v3 bpf-next 1/5] devmap: Formalize map value as a named
 struct

On Thu, 28 May 2020 23:20:53 -0600
David Ahern <dsahern@...nel.org> wrote:

> Add 'struct bpf_devmap_val' to the bpf uapi to formalize the
> expected values that can be passed in for a DEVMAP.
> Update devmap code to use the struct.
> 
> Signed-off-by: David Ahern <dsahern@...nel.org>
> ---
>  include/uapi/linux/bpf.h       |  5 +++++
>  kernel/bpf/devmap.c            | 40 +++++++++++++++++++---------------
>  tools/include/uapi/linux/bpf.h |  5 +++++
>  3 files changed, 33 insertions(+), 17 deletions(-)
> 
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index 54b93f8b49b8..42c884dfbad9 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -3625,6 +3625,11 @@ struct xdp_md {
>  	__u32 rx_queue_index;  /* rxq->queue_index  */
>  };
>  
> +/* DEVMAP values */
> +struct bpf_devmap_val {
> +	__u32 ifindex;   /* device index */
> +};

We do need this struct bpf_devmap_val, but I think it is wrong to make this UAPI.

A BPF-prog can get this via:  #include "vmlinux.h"

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer