X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fnet%2Ftcp.h;h=f0c5e7a2940045fbe80da96c41f1078ea5236e8a;hb=ab70768ec78c6784958bab3b58fbe3f4150006df;hp=299872d461c7c5bb3f0d136d6be5cecb788883b1;hpb=b5860bbac7be1381626f3dc8a0cb970a60fcefb4;p=linux-2.6

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 299872d461..f0c5e7a294 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -309,6 +309,9 @@ extern int			tcp_twsk_unique(struct sock *sk,
 
 extern void			tcp_twsk_destructor(struct sock *sk);
 
+extern ssize_t			tcp_splice_read(struct socket *sk, loff_t *ppos,
+					        struct pipe_inode_info *pipe, size_t len, unsigned int flags);
+
 static inline void tcp_dec_quickack_mode(struct sock *sk,
 					 const unsigned int pkts)
 {
@@ -614,24 +617,6 @@ static inline void tcp_dec_pcount_approx(__u32 *count,
 	tcp_dec_pcount_approx_int(count, tcp_skb_pcount(skb));
 }
 
-static inline void tcp_packets_out_inc(struct sock *sk,
-				       const struct sk_buff *skb)
-{
-	struct tcp_sock *tp = tcp_sk(sk);
-	int orig = tp->packets_out;
-
-	tp->packets_out += tcp_skb_pcount(skb);
-	if (!orig)
-		inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
-					  inet_csk(sk)->icsk_rto, TCP_RTO_MAX);
-}
-
-static inline void tcp_packets_out_dec(struct tcp_sock *tp, 
-				       const struct sk_buff *skb)
-{
-	tp->packets_out -= tcp_skb_pcount(skb);
-}
-
 /* Events passed to congestion control interface */
 enum tcp_ca_event {
 	CA_EVENT_TX_START,	/* first transmit when no packets in flight */
@@ -719,6 +704,39 @@ static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event)
 		icsk->icsk_ca_ops->cwnd_event(sk, event);
 }
 
+/* These functions determine how the current flow behaves in respect of SACK
+ * handling. SACK is negotiated with the peer, and therefore it can vary
+ * between different flows.
+ *
+ * tcp_is_sack - SACK enabled
+ * tcp_is_reno - No SACK
+ * tcp_is_fack - FACK enabled, implies SACK enabled
+ */
+static inline int tcp_is_sack(const struct tcp_sock *tp)
+{
+	return tp->rx_opt.sack_ok;
+}
+
+static inline int tcp_is_reno(const struct tcp_sock *tp)
+{
+	return !tcp_is_sack(tp);
+}
+
+static inline int tcp_is_fack(const struct tcp_sock *tp)
+{
+	return tp->rx_opt.sack_ok & 2;
+}
+
+static inline void tcp_enable_fack(struct tcp_sock *tp)
+{
+	tp->rx_opt.sack_ok |= 2;
+}
+
+static inline unsigned int tcp_left_out(const struct tcp_sock *tp)
+{
+	return tp->sacked_out + tp->lost_out;
+}
+
 /* This determines how many packets are "in the network" to the best
  * of our knowledge.  In many cases it is conservative, but where
  * detailed information is available from the receiver (via SACK
@@ -735,8 +753,7 @@ static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event)
  */
 static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp)
 {
-	return tp->packets_out - (tp->sacked_out + tp->lost_out) +
-		tp->retrans_out;
+	return tp->packets_out - tcp_left_out(tp) + tp->retrans_out;
 }
 
 /* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd.
@@ -754,11 +771,8 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk)
 			    (tp->snd_cwnd >> 2)));
 }
 
-static inline void tcp_sync_left_out(struct tcp_sock *tp)
-{
-	BUG_ON(tp->rx_opt.sack_ok &&
-	       (tp->sacked_out + tp->lost_out > tp->packets_out));
-}
+/* Use define here intentionally to get WARN_ON location shown at the caller */
+#define tcp_verify_left_out(tp)	WARN_ON(tcp_left_out(tp) > tp->packets_out)
 
 extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh);
 extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst);
@@ -792,7 +806,7 @@ static inline int tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight)
 		return left <= tcp_max_burst(tp);
 }
 
-static inline void tcp_minshall_update(struct tcp_sock *tp, int mss,
+static inline void tcp_minshall_update(struct tcp_sock *tp, unsigned int mss,
 				       const struct sk_buff *skb)
 {
 	if (skb->len < mss)
@@ -1055,13 +1069,18 @@ static inline void tcp_mib_init(void)
 	TCP_ADD_STATS_USER(TCP_MIB_MAXCONN, -1);
 }
 
-/*from STCP */
-static inline void clear_all_retrans_hints(struct tcp_sock *tp){
+/* from STCP */
+static inline void tcp_clear_retrans_hints_partial(struct tcp_sock *tp)
+{
 	tp->lost_skb_hint = NULL;
 	tp->scoreboard_skb_hint = NULL;
 	tp->retransmit_skb_hint = NULL;
 	tp->forward_skb_hint = NULL;
-	tp->fastpath_skb_hint = NULL;
+}
+
+static inline void tcp_clear_all_retrans_hints(struct tcp_sock *tp)
+{
+	tcp_clear_retrans_hints_partial(tp);
 }
 
 /* MD5 Signature */
@@ -1271,6 +1290,9 @@ static inline void tcp_insert_write_queue_before(struct sk_buff *new,
 						  struct sock *sk)
 {
 	__skb_insert(new, skb->prev, skb, &sk->sk_write_queue);
+
+	if (sk->sk_send_head == skb)
+		sk->sk_send_head = new;
 }
 
 static inline void tcp_unlink_write_queue(struct sk_buff *skb, struct sock *sk)
@@ -1289,6 +1311,16 @@ static inline int tcp_write_queue_empty(struct sock *sk)
 	return skb_queue_empty(&sk->sk_write_queue);
 }
 
+/* Start sequence of the highest skb with SACKed bit, valid only if
+ * sacked > 0 or when the caller has ensured validity by itself.
+ */
+static inline u32 tcp_highest_sack_seq(struct tcp_sock *tp)
+{
+	if (!tp->sacked_out)
+		return tp->snd_una;
+	return TCP_SKB_CB(tp->highest_sack)->seq;
+}
+
 /* /proc */
 enum tcp_seq_states {
 	TCP_SEQ_STATE_LISTENING,