tcp_comp: add init and cleanup hook for compression

hulk inclusion
category: feature
bugzilla: NA
CVE: NA

-------------------------------------------------

When establishing a tcp connection or closing it, the
tcp compression needs to be initialized or cleaned
up at the same time.

Add dummy init and cleanup hook for tcp compression.
It will be implemented later.
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: NWang Yufen <wangyufen@huawei.com>
Reviewed-by: NWei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: NYue Haibing <yuehaibing@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

include/net/tcp.h

@@ -2213,11 +2213,20 @@ void clean_acked_data_disable(struct inet_connection_sock *icsk);
 #if IS_ENABLED(CONFIG_TCP_COMP)
 extern struct static_key_false tcp_have_comp;
 bool tcp_syn_comp_enabled(const struct tcp_sock *tp);
+void tcp_init_compression(struct sock *sk);
+void tcp_cleanup_compression(struct sock *sk);
 #else
 static inline bool tcp_syn_comp_enabled(const struct tcp_sock *tp)
 {
 	return false;
 }
+static inline void tcp_init_compression(struct sock *sk)
+{
+}
+
+static inline void tcp_cleanup_compression(struct sock *sk)
+{
+}
 #endif
 
 #endif	/* _TCP_H */

net/ipv4/tcp.c

@@ -470,6 +470,7 @@ void tcp_init_transfer(struct sock *sk, int bpf_op)
 	tcp_init_metrics(sk);
 	tcp_call_bpf(sk, bpf_op, 0, NULL);
 	tcp_init_congestion_control(sk);
+	tcp_init_compression(sk);
 	tcp_init_buffer_space(sk);
 }
 

net/ipv4/tcp_comp.c

@@ -11,3 +11,11 @@ bool tcp_syn_comp_enabled(const struct tcp_sock *tp)
 {
 	return true;
 }
+
+void tcp_init_compression(struct sock *sk)
+{
+}
+
+void tcp_cleanup_compression(struct sock *sk)
+{
+}

net/ipv4/tcp_ipv4.c

@@ -2074,6 +2074,8 @@ void tcp_v4_destroy_sock(struct sock *sk)
 
 	tcp_cleanup_congestion_control(sk);
 
+	tcp_cleanup_compression(sk);
+
 	tcp_cleanup_ulp(sk);
 
 	/* Cleanup up the write buffer. */