ANDROID: GKI: net: add vendor hook to check if out of order occurs

1.android_vh_tcp_rcv_established_fast_path
Check if there are received packets out of order for the fast path.
2.android_vh_tcp_rcv_established_slow_path
Check if there are received packets out of order for the slow path.

Bug: 378600969
Change-Id: Ifad16bd9523ac0c3cc0c0c98dfb0884635f3a537
Signed-off-by: Chenghao Zhao <[email protected]>

Author: Chenghao Zhao

drivers/android/vendor_hooks.c

@@ -387,6 +387,8 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_tcp_clean_rtx_queue);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_tcp_rcv_synack);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_udp_unicast_rcv_skb);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_udp6_unicast_rcv_skb);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_tcp_rcv_established_fast_path);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_tcp_rcv_established_slow_path);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_try_to_unmap_one);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_record_rwsem_reader_owned);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_clear_rwsem_reader_owned);

include/trace/hooks/net.h

@@ -120,6 +120,10 @@ DECLARE_HOOK(android_vh_udp_unicast_rcv_skb,
 DECLARE_HOOK(android_vh_udp6_unicast_rcv_skb,
 	TP_PROTO(struct sk_buff *skb, struct sock *sk),
 	TP_ARGS(skb, sk));
+DECLARE_HOOK(android_vh_tcp_rcv_established_fast_path,
+	TP_PROTO(struct sock *sk), TP_ARGS(sk));
+DECLARE_HOOK(android_vh_tcp_rcv_established_slow_path,
+	TP_PROTO(struct sock *sk), TP_ARGS(sk));
 /* macro versions of hooks are no longer required */
 
 #endif /* _TRACE_HOOK_NET_VH_H */

net/ipv4/tcp_input.c

@@ -6079,6 +6079,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb)
 
 			__tcp_ack_snd_check(sk, 0);
 no_ack:
+			trace_android_vh_tcp_rcv_established_fast_path(sk);
 			if (eaten)
 				kfree_skb_partial(skb, fragstolen);
 			tcp_data_ready(sk);
@@ -6118,6 +6119,8 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb)
 
 	tcp_data_snd_check(sk);
 	tcp_ack_snd_check(sk);
+
+	trace_android_vh_tcp_rcv_established_slow_path(sk);
 	return;
 
 csum_error: