[PATCH net-next v3 1/6] net/tcp: Use static_branch_tcp_{md5,ao} to drop ifdefs

[Dmitry Safonov via B4 Relay]

From: Dmitry Safonov <0x7f454...@gmail.com>

It's possible to clean-up some ifdefs by hiding that
tcp_{md5,ao}_needed static branch is defined and compiled only
under related configs, since commit 4c8530dc7d7d ("net/tcp: Only produce
AO/MD5 logs if there are any keys").

Reviewed-by: Eric Dumazet <eduma...@google.com>
Signed-off-by: Dmitry Safonov <0x7f454...@gmail.com>
---
 include/net/tcp.h   | 14 ++++----------
 net/ipv4/tcp_ipv4.c |  8 ++------
 2 files changed, 6 insertions(+), 16 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index a70fc39090fe..e5427b05129b 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2386,21 +2386,15 @@ static inline void tcp_get_current_key(const struct 
sock *sk,
 
 static inline bool tcp_key_is_md5(const struct tcp_key *key)
 {
-#ifdef CONFIG_TCP_MD5SIG
-       if (static_branch_unlikely(&tcp_md5_needed.key) &&
-           key->type == TCP_KEY_MD5)
-               return true;
-#endif
+       if (static_branch_tcp_md5())
+               return key->type == TCP_KEY_MD5;
        return false;
 }
 
 static inline bool tcp_key_is_ao(const struct tcp_key *key)
 {
-#ifdef CONFIG_TCP_AO
-       if (static_branch_unlikely(&tcp_ao_needed.key) &&
-           key->type == TCP_KEY_AO)
-               return true;
-#endif
+       if (static_branch_tcp_ao())
+               return key->type == TCP_KEY_AO;
        return false;
 }
 
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 3613e08ca794..b36bfd64382f 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1054,12 +1054,10 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct 
sk_buff *skb)
 #else
        if (0) {
 #endif
-#ifdef CONFIG_TCP_MD5SIG
-       } else if (static_branch_unlikely(&tcp_md5_needed.key)) {
+       } else if (static_branch_tcp_md5()) {
                key.md5_key = tcp_twsk_md5_key(tcptw);
                if (key.md5_key)
                        key.type = TCP_KEY_MD5;
-#endif
        }
 
        tcp_v4_send_ack(sk, skb,
@@ -1128,8 +1126,7 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, 
struct sk_buff *skb,
 #else
        if (0) {
 #endif
-#ifdef CONFIG_TCP_MD5SIG
-       } else if (static_branch_unlikely(&tcp_md5_needed.key)) {
+       } else if (static_branch_tcp_md5()) {
                const union tcp_md5_addr *addr;
                int l3index;
 
@@ -1138,7 +1135,6 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, 
struct sk_buff *skb,
                key.md5_key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
                if (key.md5_key)
                        key.type = TCP_KEY_MD5;
-#endif
        }
 
        tcp_v4_send_ack(sk, skb, seq,

-- 
2.42.0