netdev - Re: [PATCH bpf v2] selftests: bpf: fix inlines in test_lwt

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Message-ID: <CAH3MdRWkErtRCDG6hLheEcpzo9baoP2LR6QJ31niGpvCCmV+Rw@mail.gmail.com>
Date:   Tue, 2 Jul 2019 10:58:18 -0700
From:   Y Song <ys114321@...il.com>
To:     Jiri Benc <jbenc@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Mathieu Xhonneux <m.xhonneux@...il.com>,
        Song Liu <liu.song.a23@...il.com>
Subject: Re: [PATCH bpf v2] selftests: bpf: fix inlines in test_lwt_seg6local

On Tue, Jul 2, 2019 at 10:41 AM Jiri Benc <jbenc@...hat.com> wrote:
>
> Selftests are reporting this failure in test_lwt_seg6local.sh:
>
> + ip netns exec ns2 ip -6 route add fb00::6 encap bpf in obj test_lwt_seg6local.o sec encap_srh dev veth2
> Error fetching program/map!
> Failed to parse eBPF program: Operation not permitted
>
> The problem is __attribute__((always_inline)) alone is not enough to prevent
> clang from inserting those functions in .text. In that case, .text is not
> marked as relocateable.
>
> See the output of objdump -h test_lwt_seg6local.o:
>
> Idx Name          Size      VMA               LMA               File off  Algn
>   0 .text         00003530  0000000000000000  0000000000000000  00000040  2**3
>                   CONTENTS, ALLOC, LOAD, READONLY, CODE
>
> This causes the iproute bpf loader to fail in bpf_fetch_prog_sec:
> bpf_has_call_data returns true but bpf_fetch_prog_relo fails as there's no
> relocateable .text section in the file.
>
> To fix this, convert to 'static __always_inline'.
>
> v2: Use 'static __always_inline' instead of 'static inline
>     __attribute__((always_inline))'
>
> Fixes: c99a84eac026 ("selftests/bpf: test for seg6local End.BPF action")
> Signed-off-by: Jiri Benc <jbenc@...hat.com>

Acked-by: Yonghong Song <yhs@...com>

> ---
>  .../testing/selftests/bpf/progs/test_lwt_seg6local.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/progs/test_lwt_seg6local.c b/tools/testing/selftests/bpf/progs/test_lwt_seg6local.c
> index 0575751bc1bc..e2f6ed0a583d 100644
> --- a/tools/testing/selftests/bpf/progs/test_lwt_seg6local.c
> +++ b/tools/testing/selftests/bpf/progs/test_lwt_seg6local.c
> @@ -61,7 +61,7 @@ struct sr6_tlv_t {
>         unsigned char value[0];
>  } BPF_PACKET_HEADER;
>
> -__attribute__((always_inline)) struct ip6_srh_t *get_srh(struct __sk_buff *skb)
> +static __always_inline struct ip6_srh_t *get_srh(struct __sk_buff *skb)
>  {
>         void *cursor, *data_end;
>         struct ip6_srh_t *srh;
> @@ -95,7 +95,7 @@ __attribute__((always_inline)) struct ip6_srh_t *get_srh(struct __sk_buff *skb)
>         return srh;
>  }
>
> -__attribute__((always_inline))
> +static __always_inline
>  int update_tlv_pad(struct __sk_buff *skb, uint32_t new_pad,
>                    uint32_t old_pad, uint32_t pad_off)
>  {
> @@ -125,7 +125,7 @@ int update_tlv_pad(struct __sk_buff *skb, uint32_t new_pad,
>         return 0;
>  }
>
> -__attribute__((always_inline))
> +static __always_inline
>  int is_valid_tlv_boundary(struct __sk_buff *skb, struct ip6_srh_t *srh,
>                           uint32_t *tlv_off, uint32_t *pad_size,
>                           uint32_t *pad_off)
> @@ -184,7 +184,7 @@ int is_valid_tlv_boundary(struct __sk_buff *skb, struct ip6_srh_t *srh,
>         return 0;
>  }
>
> -__attribute__((always_inline))
> +static __always_inline
>  int add_tlv(struct __sk_buff *skb, struct ip6_srh_t *srh, uint32_t tlv_off,
>             struct sr6_tlv_t *itlv, uint8_t tlv_size)
>  {
> @@ -228,7 +228,7 @@ int add_tlv(struct __sk_buff *skb, struct ip6_srh_t *srh, uint32_t tlv_off,
>         return update_tlv_pad(skb, new_pad, pad_size, pad_off);
>  }
>
> -__attribute__((always_inline))
> +static __always_inline
>  int delete_tlv(struct __sk_buff *skb, struct ip6_srh_t *srh,
>                uint32_t tlv_off)
>  {
> @@ -266,7 +266,7 @@ int delete_tlv(struct __sk_buff *skb, struct ip6_srh_t *srh,
>         return update_tlv_pad(skb, new_pad, pad_size, pad_off);
>  }
>
> -__attribute__((always_inline))
> +static __always_inline
>  int has_egr_tlv(struct __sk_buff *skb, struct ip6_srh_t *srh)
>  {
>         int tlv_offset = sizeof(struct ip6_t) + sizeof(struct ip6_srh_t) +
> --
> 2.18.1
>