netdev - Re: [PATCH v3 1/1] xdp: remove the function xsk_map

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Date:   Mon, 23 Nov 2020 22:28:49 +0800
From:   Zhu Yanjun <zyjzyj2000@...il.com>
To:     magnus.karlsson@...el.com, bjorn.topel@...el.com,
        "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 1/1] xdp: remove the function xsk_map_inc

On Mon, Nov 23, 2020 at 10:27 PM <zyjzyj2000@...il.com> wrote:
>
> From: Zhu Yanjun <zyjzyj2000@...il.com>
>
> The function xsk_map_inc is a simple wrapper of bpf_map_inc and
> always returns zero. As such, replacing this function with bpf_map_inc
> and removing the test code.
>
> Signed-off-by: Zhu Yanjun <zyjzyj2000@...il.com>
> ---
>  net/xdp/xsk.c    |  2 +-
>  net/xdp/xsk.h    |  1 -
>  net/xdp/xskmap.c | 13 +------------
>  3 files changed, 2 insertions(+), 14 deletions(-)
>
> diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
> index cfbec3989a76..a3c1f07d77d8 100644
> --- a/net/xdp/xsk.c
> +++ b/net/xdp/xsk.c
> @@ -548,7 +548,7 @@ static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs,
>         node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node,
>                                         node);
>         if (node) {
> -               WARN_ON(xsk_map_inc(node->map));
> +               bpf_map_inc(&node->map->map);

Thanks. This is the latest version.

Zhu Yanjun

>                 map = node->map;
>                 *map_entry = node->map_entry;
>         }
> diff --git a/net/xdp/xsk.h b/net/xdp/xsk.h
> index b9e896cee5bb..0aad25c0e223 100644
> --- a/net/xdp/xsk.h
> +++ b/net/xdp/xsk.h
> @@ -41,7 +41,6 @@ static inline struct xdp_sock *xdp_sk(struct sock *sk)
>
>  void xsk_map_try_sock_delete(struct xsk_map *map, struct xdp_sock *xs,
>                              struct xdp_sock **map_entry);
> -int xsk_map_inc(struct xsk_map *map);
>  void xsk_map_put(struct xsk_map *map);
>  void xsk_clear_pool_at_qid(struct net_device *dev, u16 queue_id);
>  int xsk_reg_pool_at_qid(struct net_device *dev, struct xsk_buff_pool *pool,
> diff --git a/net/xdp/xskmap.c b/net/xdp/xskmap.c
> index 49da2b8ace8b..6b7e9a72b101 100644
> --- a/net/xdp/xskmap.c
> +++ b/net/xdp/xskmap.c
> @@ -11,12 +11,6 @@
>
>  #include "xsk.h"
>
> -int xsk_map_inc(struct xsk_map *map)
> -{
> -       bpf_map_inc(&map->map);
> -       return 0;
> -}
> -
>  void xsk_map_put(struct xsk_map *map)
>  {
>         bpf_map_put(&map->map);
> @@ -26,17 +20,12 @@ static struct xsk_map_node *xsk_map_node_alloc(struct xsk_map *map,
>                                                struct xdp_sock **map_entry)
>  {
>         struct xsk_map_node *node;
> -       int err;
>
>         node = kzalloc(sizeof(*node), GFP_ATOMIC | __GFP_NOWARN);
>         if (!node)
>                 return ERR_PTR(-ENOMEM);
>
> -       err = xsk_map_inc(map);
> -       if (err) {
> -               kfree(node);
> -               return ERR_PTR(err);
> -       }
> +       bpf_map_inc(&map->map);
>
>         node->map = map;
>         node->map_entry = map_entry;
> --
> 2.25.1
>