tcp: use RACK to detect losses

[deliverable/linux.git] / include / net / tcp.h

diff --git a/include/net/tcp.h b/include/net/tcp.h
index a6be56d5f0e3757cb0b0f6f5d6caf2c63ea66203..11e3204122167e55d4a6bcf142f5ac34d5ccb85d 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -279,6 +279,7 @@ extern int sysctl_tcp_limit_output_bytes;
 extern int sysctl_tcp_challenge_ack_limit;
 extern unsigned int sysctl_tcp_notsent_lowat;
 extern int sysctl_tcp_min_tso_segs;
+extern int sysctl_tcp_min_rtt_wlen;
 extern int sysctl_tcp_autocorking;
 extern int sysctl_tcp_invalid_ratelimit;
 extern int sysctl_tcp_pacing_ss_ratio;
@@ -566,6 +567,7 @@ void tcp_resume_early_retransmit(struct sock *sk);
 void tcp_rearm_rto(struct sock *sk);
 void tcp_synack_rtt_meas(struct sock *sk, struct request_sock *req);
 void tcp_reset(struct sock *sk);
+void tcp_skb_mark_lost_uncond_verify(struct tcp_sock *tp, struct sk_buff *skb);
 
 /* tcp_timer.c */
 void tcp_init_xmit_timers(struct sock *);
@@ -671,6 +673,12 @@ static inline bool tcp_ca_dst_locked(const struct dst_entry *dst)
        return dst_metric_locked(dst, RTAX_CC_ALGO);
 }
 
+/* Minimum RTT in usec. ~0 means not available. */
+static inline u32 tcp_min_rtt(const struct tcp_sock *tp)
+{
+       return tp->rtt_min[0].rtt;
+}
+
 /* Compute the actual receive window we are currently advertising.
  * Rcv_nxt can be after the window if our peer push more data
  * than the offered window.
@@ -1716,7 +1724,7 @@ struct tcp_request_sock_ops {
        __u32 (*init_seq)(const struct sk_buff *skb);
        int (*send_synack)(const struct sock *sk, struct dst_entry *dst,
                           struct flowi *fl, struct request_sock *req,
-                          u16 queue_mapping, struct tcp_fastopen_cookie *foc,
+                          struct tcp_fastopen_cookie *foc,
                           bool attach_req);
 };
 
@@ -1743,6 +1751,19 @@ int tcpv4_offload_init(void);
 void tcp_v4_init(void);
 void tcp_init(void);
 
+/* tcp_recovery.c */
+
+/* Flags to enable various loss recovery features. See below */
+extern int sysctl_tcp_recovery;
+
+/* Use TCP RACK to detect (some) tail and retransmit losses */
+#define TCP_RACK_LOST_RETRANS  0x1
+
+extern int tcp_rack_mark_lost(struct sock *sk);
+
+extern void tcp_rack_advance(struct tcp_sock *tp,
+                            const struct skb_mstamp *xmit_time, u8 sacked);
+
 /*
  * Save and compile IPv4 options, return a pointer to it
  */