Re: [PATCH nf-next 0/5] Add IP6IP6 flowtable SW acceleration

[Jakub Kicinski <kuba@kernel.org>]

On Sun, 07 Dec 2025 17:06:40 +0100 Lorenzo Bianconi wrote:
> Introduce SW acceleration for IP6IP6 tunnels in the netfilter flowtable
> infrastructure.

tc-testing build fails with this:

net/netfilter/nf_flow_table_ip.c: In function ‘nf_flow_ip6_tunnel_proto’:
net/netfilter/nf_flow_table_ip.c:370:42: error: ‘inet6_protos’ undeclared (first use in this function); did you mean ‘inet_protos’?
  370 |                 ipprot = rcu_dereference(inet6_protos[nexthdr]);
      |                                          ^~~~~~~~~~~~
./include/linux/rcupdate.h:532:17: note: in definition of macro ‘__rcu_dereference_check’
  532 |         typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
      |                 ^
./include/linux/rcupdate.h:770:28: note: in expansion of macro ‘rcu_dereference_check’
  770 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
      |                            ^~~~~~~~~~~~~~~~~~~~~
net/netfilter/nf_flow_table_ip.c:370:26: note: in expansion of macro ‘rcu_dereference’
  370 |                 ipprot = rcu_dereference(inet6_protos[nexthdr]);
      |                          ^~~~~~~~~~~~~~~
net/netfilter/nf_flow_table_ip.c:370:42: note: each undeclared identifier is reported only once for each function it appears in
  370 |                 ipprot = rcu_dereference(inet6_protos[nexthdr]);
      |                                          ^~~~~~~~~~~~
./include/linux/rcupdate.h:532:17: note: in definition of macro ‘__rcu_dereference_check’
  532 |         typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
      |                 ^
./include/linux/rcupdate.h:770:28: note: in expansion of macro ‘rcu_dereference_check’
  770 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
      |                            ^~~~~~~~~~~~~~~~~~~~~
net/netfilter/nf_flow_table_ip.c:370:26: note: in expansion of macro ‘rcu_dereference’
  370 |                 ipprot = rcu_dereference(inet6_protos[nexthdr]);
      |                          ^~~~~~~~~~~~~~~
net/netfilter/nf_flow_table_ip.c:374:27: error: invalid use of undefined type ‘const struct inet6_protocol’
  374 |                 if (ipprot->flags & INET6_PROTO_FINAL) {
      |                           ^~
net/netfilter/nf_flow_table_ip.c:374:37: error: ‘INET6_PROTO_FINAL’ undeclared (first use in this function)
  374 |                 if (ipprot->flags & INET6_PROTO_FINAL) {
      |                                     ^~~~~~~~~~~~~~~~~
net/netfilter/nf_flow_table_ip.c:383:29: error: invalid use of undefined type ‘const struct inet6_protocol’
  383 |                 ret = ipprot->handler(skb);
      |                             ^~