netdev - Re: [PATCH iproute2-next] Update tc-bpf.8 man page examples

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Date:   Fri, 26 Apr 2019 11:40:27 -0600
From:   David Ahern <dsahern@...il.com>
To:     Lucas Siba <lucas.siba@...il.com>, netdev@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH iproute2-next] Update tc-bpf.8 man page examples

On 4/20/19 1:06 PM, Lucas Siba wrote:
> From: Lucas Siba @ 2019-04-20 11:40 UTC
> To: netdev
> 
> This patch updates the tc-bpf.8 example application for changes to the
> struct bpf_elf_map definition. In it's current form, things compile, but
> the resulting object file is rejected by the verifier when attempting to
> load it through tc.
> 
> Signed-off-by: Lucas Siba <lucas.siba@...il.com>
> ---
>  man/man8/tc-bpf.8 | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)

Daniel: you agree with this change?

> 
> diff --git a/man/man8/tc-bpf.8 b/man/man8/tc-bpf.8
> index b2f9344f..b6cfeab9 100644
> --- a/man/man8/tc-bpf.8
> +++ b/man/man8/tc-bpf.8
> @@ -597,6 +597,8 @@ struct bpf_elf_map __section("maps") map_stats = {
>          .size_key       =       sizeof(uint32_t),
>          .size_value     =       sizeof(struct tuple),
>          .max_elem       =       BPF_MAX_MARK,
> +        .pinning        =       PIN_GLOBAL_NS,
> +        .flags          =       0,
>  };
> 
>  static inline void cls_update_stats(const struct __sk_buff *skb,
> @@ -709,13 +711,22 @@ in both examples was:
>  #define likely(x) __builtin_expect(!!(x), 1)
>  #define unlikely(x) __builtin_expect(!!(x), 0)
> 
> -/* Used map structure */
> +/* Object pinning settings */
> +#define PIN_NONE       0
> +#define PIN_OBJECT_NS  1
> +#define PIN_GLOBAL_NS  2
> +
> +/* ELF map definition */
>  struct bpf_elf_map {
>      __u32 type;
>      __u32 size_key;
>      __u32 size_value;
>      __u32 max_elem;
> +    __u32 flags;
>      __u32 id;
> +    __u32 pinning;
> +    __u32 inner_id;
> +    __u32 inner_idx;
>  };
> 
>  /* Some used BPF function calls. */
> --
> In a future patch, it might be worth changing the man page to refer to
> "bpf_elf.h" and "uapi/linux/bpf.h" for the definition of structures and
> constants, as they may be changed again without the man page being updated.
>