[PATCHv2 bpf-next] mptcp: Add struct mptcp_sock definition when CONFIG_MPTCP is disabled

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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@xxxxxx>
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
 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




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