tcp: remove CA_ACK_SLOWPATH

re-indent tcp_ack, and remove CA_ACK_SLOWPATH; it is always set now.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/tcp.h

@@ -880,9 +880,8 @@ enum tcp_ca_event {
 
 /* Information about inbound ACK, passed to cong_ops->in_ack_event() */
 enum tcp_ca_ack_event_flags {
-	CA_ACK_SLOWPATH		= (1 << 0),	/* In slow path processing */
-	CA_ACK_WIN_UPDATE	= (1 << 1),	/* ACK updated window */
-	CA_ACK_ECE		= (1 << 2),	/* ECE bit is set on ack */
+	CA_ACK_WIN_UPDATE	= (1 << 0),	/* ACK updated window */
+	CA_ACK_ECE		= (1 << 1),	/* ECE bit is set on ack */
 };
 
 /*

net/ipv4/tcp_input.c

@@ -3547,6 +3547,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 	u32 lost = tp->lost;
 	int acked = 0; /* Number of packets newly acked */
 	int rexmit = REXMIT_NONE; /* Flag to (re)transmit to recover losses */
+	u32 ack_ev_flags = 0;
 
 	sack_state.first_sackt = 0;
 	sack_state.rate = &rs;
@@ -3590,9 +3591,6 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 	if (flag & FLAG_UPDATE_TS_RECENT)
 		tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq);
 
-	{
-		u32 ack_ev_flags = CA_ACK_SLOWPATH;
-
 	if (ack_seq != TCP_SKB_CB(skb)->end_seq)
 		flag |= FLAG_DATA;
 	else
@@ -3606,14 +3604,13 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 
 	if (tcp_ecn_rcv_ecn_echo(tp, tcp_hdr(skb))) {
 		flag |= FLAG_ECE;
-			ack_ev_flags |= CA_ACK_ECE;
+		ack_ev_flags = CA_ACK_ECE;
 	}
 
 	if (flag & FLAG_WIN_UPDATE)
 		ack_ev_flags |= CA_ACK_WIN_UPDATE;
 
 	tcp_in_ack_event(sk, ack_ev_flags);
-	}
 
 	/* We passed data and got it acked, remove any soft error
 	 * log. Something worked...

net/ipv4/tcp_westwood.c

@@ -153,24 +153,6 @@ static inline void update_rtt_min(struct westwood *w)
 		w->rtt_min = min(w->rtt, w->rtt_min);
 }
 
-/*
- * @westwood_fast_bw
- * It is called when we are in fast path. In particular it is called when
- * header prediction is successful. In such case in fact update is
- * straight forward and doesn't need any particular care.
- */
-static inline void westwood_fast_bw(struct sock *sk)
-{
-	const struct tcp_sock *tp = tcp_sk(sk);
-	struct westwood *w = inet_csk_ca(sk);
-
-	westwood_update_window(sk);
-
-	w->bk += tp->snd_una - w->snd_una;
-	w->snd_una = tp->snd_una;
-	update_rtt_min(w);
-}
-
 /*
  * @westwood_acked_count
  * This function evaluates cumul_ack for evaluating bk in case of
@@ -223,17 +205,12 @@ static u32 tcp_westwood_bw_rttmin(const struct sock *sk)
 
 static void tcp_westwood_ack(struct sock *sk, u32 ack_flags)
 {
-	if (ack_flags & CA_ACK_SLOWPATH) {
 	struct westwood *w = inet_csk_ca(sk);
 
 	westwood_update_window(sk);
 	w->bk += westwood_acked_count(sk);
 
 	update_rtt_min(w);
-		return;
-	}
-
-	westwood_fast_bw(sk);
 }
 
 static void tcp_westwood_event(struct sock *sk, enum tcp_ca_event event)