netdev - Re: [PATCH bpf-next] samples/bpf: fix compilation failure

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Date:   Thu, 20 Sep 2018 10:50:15 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next] samples/bpf: fix compilation failure

On Thu, Sep 20, 2018 at 12:53 AM Prashant Bhole
<bhole_prashant_q7@....ntt.co.jp> wrote:
>
> following commit:
> commit d58e468b1112 ("flow_dissector: implements flow dissector BPF hook")
> added struct bpf_flow_keys which conflicts with the struct with
> same name in sockex2_kern.c and sockex3_kern.c
>
> similar to commit:
> commit 534e0e52bc23 ("samples/bpf: fix a compilation failure")
> we tried the rename it "flow_keys" but it also conflicted with struct
> having same name in include/net/flow_dissector.h. Hence renaming the
> struct to "flow_key_record". Also, this commit doesn't fix the
> compilation error completely because the similar struct is present in
> sockex3_kern.c. Hence renaming it in both files sockex3_user.c and
> sockex3_kern.c
>
> Signed-off-by: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>

Acked-by: Song Liu <songliubraving@...com>


> ---
>  samples/bpf/sockex2_kern.c | 11 ++++++-----
>  samples/bpf/sockex3_kern.c |  8 ++++----
>  samples/bpf/sockex3_user.c |  4 ++--
>  3 files changed, 12 insertions(+), 11 deletions(-)
>
> diff --git a/samples/bpf/sockex2_kern.c b/samples/bpf/sockex2_kern.c
> index f58acfc92556..f2f9dbc021b0 100644
> --- a/samples/bpf/sockex2_kern.c
> +++ b/samples/bpf/sockex2_kern.c
> @@ -14,7 +14,7 @@ struct vlan_hdr {
>         __be16 h_vlan_encapsulated_proto;
>  };
>
> -struct bpf_flow_keys {
> +struct flow_key_record {
>         __be32 src;
>         __be32 dst;
>         union {
> @@ -59,7 +59,7 @@ static inline __u32 ipv6_addr_hash(struct __sk_buff *ctx, __u64 off)
>  }
>
>  static inline __u64 parse_ip(struct __sk_buff *skb, __u64 nhoff, __u64 *ip_proto,
> -                            struct bpf_flow_keys *flow)
> +                            struct flow_key_record *flow)
>  {
>         __u64 verlen;
>
> @@ -83,7 +83,7 @@ static inline __u64 parse_ip(struct __sk_buff *skb, __u64 nhoff, __u64 *ip_proto
>  }
>
>  static inline __u64 parse_ipv6(struct __sk_buff *skb, __u64 nhoff, __u64 *ip_proto,
> -                              struct bpf_flow_keys *flow)
> +                              struct flow_key_record *flow)
>  {
>         *ip_proto = load_byte(skb,
>                               nhoff + offsetof(struct ipv6hdr, nexthdr));
> @@ -96,7 +96,8 @@ static inline __u64 parse_ipv6(struct __sk_buff *skb, __u64 nhoff, __u64 *ip_pro
>         return nhoff;
>  }
>
> -static inline bool flow_dissector(struct __sk_buff *skb, struct bpf_flow_keys *flow)
> +static inline bool flow_dissector(struct __sk_buff *skb,
> +                                 struct flow_key_record *flow)
>  {
>         __u64 nhoff = ETH_HLEN;
>         __u64 ip_proto;
> @@ -198,7 +199,7 @@ struct bpf_map_def SEC("maps") hash_map = {
>  SEC("socket2")
>  int bpf_prog2(struct __sk_buff *skb)
>  {
> -       struct bpf_flow_keys flow = {};
> +       struct flow_key_record flow = {};
>         struct pair *value;
>         u32 key;
>
> diff --git a/samples/bpf/sockex3_kern.c b/samples/bpf/sockex3_kern.c
> index 95907f8d2b17..c527b57d3ec8 100644
> --- a/samples/bpf/sockex3_kern.c
> +++ b/samples/bpf/sockex3_kern.c
> @@ -61,7 +61,7 @@ struct vlan_hdr {
>         __be16 h_vlan_encapsulated_proto;
>  };
>
> -struct bpf_flow_keys {
> +struct flow_key_record {
>         __be32 src;
>         __be32 dst;
>         union {
> @@ -88,7 +88,7 @@ static inline __u32 ipv6_addr_hash(struct __sk_buff *ctx, __u64 off)
>  }
>
>  struct globals {
> -       struct bpf_flow_keys flow;
> +       struct flow_key_record flow;
>  };
>
>  struct bpf_map_def SEC("maps") percpu_map = {
> @@ -114,14 +114,14 @@ struct pair {
>
>  struct bpf_map_def SEC("maps") hash_map = {
>         .type = BPF_MAP_TYPE_HASH,
> -       .key_size = sizeof(struct bpf_flow_keys),
> +       .key_size = sizeof(struct flow_key_record),
>         .value_size = sizeof(struct pair),
>         .max_entries = 1024,
>  };
>
>  static void update_stats(struct __sk_buff *skb, struct globals *g)
>  {
> -       struct bpf_flow_keys key = g->flow;
> +       struct flow_key_record key = g->flow;
>         struct pair *value;
>
>         value = bpf_map_lookup_elem(&hash_map, &key);
> diff --git a/samples/bpf/sockex3_user.c b/samples/bpf/sockex3_user.c
> index 22f74d0e1493..9d02e0404719 100644
> --- a/samples/bpf/sockex3_user.c
> +++ b/samples/bpf/sockex3_user.c
> @@ -13,7 +13,7 @@
>  #define PARSE_IP_PROG_FD (prog_fd[0])
>  #define PROG_ARRAY_FD (map_fd[0])
>
> -struct flow_keys {
> +struct flow_key_record {
>         __be32 src;
>         __be32 dst;
>         union {
> @@ -64,7 +64,7 @@ int main(int argc, char **argv)
>         (void) f;
>
>         for (i = 0; i < 5; i++) {
> -               struct flow_keys key = {}, next_key;
> +               struct flow_key_record key = {}, next_key;
>                 struct pair value;
>
>                 sleep(1);
> --
> 2.17.1
>
>