On Wed, 2019-10-30 at 16:38 -0700, Peter Krystad wrote:
> Implemented support for IPv6. selftests pass with ipv6=true, 

Nice! 

> but they take twice as long to run...

Yep, that is expected, right? ;)

> With re-factoring the addition of IPv6 is very clean but I did not
> split files yet as it will be hard to squash any changes after the
> such a split.

We still need the Kconfig boilerplate, right? something alike:

---
diff --git a/net/mptcp/Kconfig b/net/mptcp/Kconfig
index f21190a4f7e9..3fa6d91f57ee 100644
--- a/net/mptcp/Kconfig
+++ b/net/mptcp/Kconfig
@@ -9,3 +9,8 @@ config MPTCP
          uses the TCP protocol, and TCP options carry header
information for
          MPTCP.
 
+config MPTCP_IPV6
+       bool "IPv6 support form Multipath TCP"
+       depends on MPTCP
+       select IPV6
+       default y
---

and than replace IS_ENABLED(IPV6) with CONFIG_MPTCP_IPV6.

Additinal question: what happens if ipv6 is disabled at boot time
(ipv6.disable=1 on the kernel command line)?

Thanks,

Paolo