The btf_sock_ids array needs struct mptcp_sock BTF ID for
the bpf_skc_to_mptcp_sock helper.

When CONFIG_MPTCP is disabled, the 'struct mptcp_sock' is not
defined and resolve_btfids will complain with:

  BTFIDS  vmlinux
WARN: resolve_btfids: unresolved symbol mptcp_sock

Adding empty difinition for struct mptcp_sock when CONFIG_MPTCP
is disabled.

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 include/net/mptcp.h | 4 ++++
 1 file changed, 4 insertions(+)

v2 changes:
  - moved the new empty struct declaration next to the inline
    bpf_mptcp_sock_from_subflow function [Mat]

diff --git a/include/net/mptcp.h b/include/net/mptcp.h
index ac9cf7271d46..412479ebf5ad 100644
--- a/include/net/mptcp.h
+++ b/include/net/mptcp.h
@@ -291,4 +291,8 @@ struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk);
 static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; }
 #endif
 
+#if !IS_ENABLED(CONFIG_MPTCP)
+struct mptcp_sock { };
+#endif
+
 #endif /* __NET_MPTCP_H */
-- 
2.37.1

Hi Jiri,

Thank you for your modifications, that's great!

Our CI did some validations and here is its report:

- KVM Validation: normal:
  - Unstable: 1 failed test(s): selftest_mptcp_join 🔴:
  - Task: https://cirrus-ci.com/task/4744036484382720
  - Summary: https://api.cirrus-ci.com/v1/artifact/task/4744036484382720/summary/summary.txt

- KVM Validation: debug:
  - Success! ✅:
  - Task: https://cirrus-ci.com/task/5869936391225344
  - Summary: https://api.cirrus-ci.com/v1/artifact/task/5869936391225344/summary/summary.txt

Initiator: Patchew Applier
Commits: https://github.com/multipath-tcp/mptcp_net-next/commits/71103ca3923b


If there are some issues, you can reproduce them using the same environment as
the one used by the CI thanks to a docker image, e.g.:

    $ cd [kernel source code]
    $ docker run -v "${PWD}:${PWD}:rw" -w "${PWD}" --privileged --rm -it \
        --pull always mptcp/mptcp-upstream-virtme-docker:latest \
        auto-debug

For more details:

    https://github.com/multipath-tcp/mptcp-upstream-virtme-docker


Please note that despite all the efforts that have been already done to have a
stable tests suite when executed on a public CI like here, it is possible some
reported issues are not due to your modifications. Still, do not hesitate to
help us improve that ;-)

Cheers,
MPTCP GH Action bot
Bot operated by Matthieu Baerts (Tessares)

Hi Jiri, Mat,

(MPTCP ML only)

On 02/08/2022 18:33, Jiri Olsa wrote:
> The btf_sock_ids array needs struct mptcp_sock BTF ID for
> the bpf_skc_to_mptcp_sock helper.
> 
> When CONFIG_MPTCP is disabled, the 'struct mptcp_sock' is not
> defined and resolve_btfids will complain with:
> 
>   BTFIDS  vmlinux
> WARN: resolve_btfids: unresolved symbol mptcp_sock
> 
> Adding empty difinition for struct mptcp_sock when CONFIG_MPTCP
> is disabled.

Thank you for the patch and the review!

FYI, I just applied this patch in MPTCP tree (feat. for other trees)
just to track it and prevent conflicts on our side with the future
bpf-next/net-next.


New patches for t/upstream:
- fa5c3bcfae6e: mptcp: Add struct mptcp_sock definition when
CONFIG_MPTCP is disabled
- Results: 982ba3087aac..ba0f79895fde (export)


Tests are now in progress:

https://cirrus-ci.com/github/multipath-tcp/mptcp_net-next/export/20220803T162341


Cheers,
Matt
-- 
Tessares | Belgium | Hybrid Access Solutions
www.tessares.net

On Tue, 2 Aug 2022, Jiri Olsa wrote:

> The btf_sock_ids array needs struct mptcp_sock BTF ID for
> the bpf_skc_to_mptcp_sock helper.
>
> When CONFIG_MPTCP is disabled, the 'struct mptcp_sock' is not
> defined and resolve_btfids will complain with:
>
>  BTFIDS  vmlinux
> WARN: resolve_btfids: unresolved symbol mptcp_sock
>
> Adding empty difinition for struct mptcp_sock when CONFIG_MPTCP
> is disabled.
>
> Acked-by: Martin KaFai Lau <kafai@fb.com>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>

Thanks Jiri, v2 looks good to merge in bpf-next:

Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>


> ---
> include/net/mptcp.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
> v2 changes:
>  - moved the new empty struct declaration next to the inline
>    bpf_mptcp_sock_from_subflow function [Mat]
>
> diff --git a/include/net/mptcp.h b/include/net/mptcp.h
> index ac9cf7271d46..412479ebf5ad 100644
> --- a/include/net/mptcp.h
> +++ b/include/net/mptcp.h
> @@ -291,4 +291,8 @@ struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk);
> static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; }
> #endif
>
> +#if !IS_ENABLED(CONFIG_MPTCP)
> +struct mptcp_sock { };
> +#endif
> +
> #endif /* __NET_MPTCP_H */
> -- 
> 2.37.1
>
>

--
Mat Martineau
Intel

Hi Jiri,

Thank you for your modifications, that's great!

Our CI did some validations and here is its report:

- KVM Validation: Script error! ❓:
  - :
  - Task: https://cirrus-ci.com/task/4921402208813056
  - Summary: https://api.cirrus-ci.com/v1/artifact/task/4921402208813056/summary/summary.txt

- KVM Validation: Script error! ❓:
  - :
  - Task: https://cirrus-ci.com/task/6047302115655680
  - Summary: https://api.cirrus-ci.com/v1/artifact/task/6047302115655680/summary/summary.txt

Initiator: Patchew Applier
Commits: https://github.com/multipath-tcp/mptcp_net-next/commits/71103ca3923b


If there are some issues, you can reproduce them using the same environment as
the one used by the CI thanks to a docker image, e.g.:

    $ cd [kernel source code]
    $ docker run -v "${PWD}:${PWD}:rw" -w "${PWD}" --privileged --rm -it \
        --pull always mptcp/mptcp-upstream-virtme-docker:latest \
        auto-debug

For more details:

    https://github.com/multipath-tcp/mptcp-upstream-virtme-docker


Please note that despite all the efforts that have been already done to have a
stable tests suite when executed on a public CI like here, it is possible some
reported issues are not due to your modifications. Still, do not hesitate to
help us improve that ;-)

Cheers,
MPTCP GH Action bot
Bot operated by Matthieu Baerts (Tessares)