On Wed, Nov 9, 2022 at 9:46 AM Donald Hunter <donald.hunter@xxxxxxxxx> wrote:
>
> From: Dave Tucker <dave@xxxxxxxxxxxxx>
>
> Add documentation for the BPF_MAP_TYPE_ARRAY including kernel version
> introduced, usage and examples. Also document BPF_MAP_TYPE_PERCPU_ARRAY
> which is similar.
>
> Signed-off-by: Dave Tucker <dave@xxxxxxxxxxxxx>
> Co-developed-by: Donald Hunter <donald.hunter@xxxxxxxxx>
> Signed-off-by: Donald Hunter <donald.hunter@xxxxxxxxx>
> Reviewed-by: Maryam Tahhan <mtahhan@xxxxxxxxxx>
> ---
> Documentation/bpf/map_array.rst | 250 ++++++++++++++++++++++++++++++++
> 1 file changed, 250 insertions(+)
> create mode 100644 Documentation/bpf/map_array.rst
>
[...]
> +This example BPF program shows how to access an array element.
> +
> +.. code-block:: c
> +
> + int bpf_prog(struct __sk_buff *skb)
> + {
> + struct iphdr ip;
> + int index;
> + long *value;
> +
> + if (bpf_skb_load_bytes(skb, ETH_HLEN, &ip, sizeof(ip)) < 0)
> + return 0;
> +
> + index = ip.protocol;
> + value = bpf_map_lookup_elem(&my_map, &index);
> + if (value)
> + __sync_fetch_and_add(value, skb->len);
should be &value
I fixed it up and applied to bpf-next, thanks.
> +
> + return 0;
> + }
> +
> +Userspace
> +---------
> +
> +BPF_MAP_TYPE_ARRAY
> +~~~~~~~~~~~~~~~~~~
> +
> +This snippet shows how to create an array, using ``bpf_map_create_opts`` to
> +set flags.
> +
[...]
