diff options
Diffstat (limited to 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 74 |
1 files changed, 67 insertions, 7 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index c24339c4e310..0f9848011972 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -27,6 +27,7 @@ #include <linux/slab.h> #include <linux/cache.h> #include <linux/percpu.h> +#include <linux/skbuff.h> #include <net/inet_connection_sock.h> #include <net/inet_timewait_sock.h> @@ -88,10 +89,10 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo); */ #define TCP_SYN_RETRIES 5 /* number of times to retry active opening a - * connection: ~180sec is RFC minumum */ + * connection: ~180sec is RFC minimum */ #define TCP_SYNACK_RETRIES 5 /* number of times to retry passive opening a - * connection: ~180sec is RFC minumum */ + * connection: ~180sec is RFC minimum */ #define TCP_ORPHAN_RETRIES 7 /* number of times to retry on an orphaned @@ -179,7 +180,7 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo); /* Flags in tp->nonagle */ #define TCP_NAGLE_OFF 1 /* Nagle's algo is disabled */ #define TCP_NAGLE_CORK 2 /* Socket is corked */ -#define TCP_NAGLE_PUSH 4 /* Cork is overriden for already queued data */ +#define TCP_NAGLE_PUSH 4 /* Cork is overridden for already queued data */ extern struct inet_timewait_death_row tcp_death_row; @@ -217,6 +218,7 @@ extern int sysctl_tcp_low_latency; extern int sysctl_tcp_nometrics_save; extern int sysctl_tcp_moderate_rcvbuf; extern int sysctl_tcp_tso_win_divisor; +extern int sysctl_tcp_abc; extern atomic_t tcp_memory_allocated; extern atomic_t tcp_sockets_allocated; @@ -550,13 +552,13 @@ extern u32 __tcp_select_window(struct sock *sk); /* TCP timestamps are only 32-bits, this causes a slight * complication on 64-bit systems since we store a snapshot - * of jiffies in the buffer control blocks below. We decidely + * of jiffies in the buffer control blocks below. We decidedly * only use of the low 32-bits of jiffies and hide the ugly * casts with the following macro. */ #define tcp_time_stamp ((__u32)(jiffies)) -/* This is what the send packet queueing engine uses to pass +/* This is what the send packet queuing engine uses to pass * TCP per-packet control information to the transmission * code. We also store the host-order sequence numbers in * here too. This is 36 bytes on 32-bit architectures, @@ -596,7 +598,7 @@ struct tcp_skb_cb { #define TCPCB_EVER_RETRANS 0x80 /* Ever retransmitted frame */ #define TCPCB_RETRANS (TCPCB_SACKED_RETRANS|TCPCB_EVER_RETRANS) -#define TCPCB_URG 0x20 /* Urgent pointer advenced here */ +#define TCPCB_URG 0x20 /* Urgent pointer advanced here */ #define TCPCB_AT_TAIL (TCPCB_URG) @@ -764,6 +766,33 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk) (tp->snd_cwnd >> 2))); } +/* + * Linear increase during slow start + */ +static inline void tcp_slow_start(struct tcp_sock *tp) +{ + if (sysctl_tcp_abc) { + /* RFC3465: Slow Start + * TCP sender SHOULD increase cwnd by the number of + * previously unacknowledged bytes ACKed by each incoming + * acknowledgment, provided the increase is not more than L + */ + if (tp->bytes_acked < tp->mss_cache) + return; + + /* We MAY increase by 2 if discovered delayed ack */ + if (sysctl_tcp_abc > 1 && tp->bytes_acked > 2*tp->mss_cache) { + if (tp->snd_cwnd < tp->snd_cwnd_clamp) + tp->snd_cwnd++; + } + } + tp->bytes_acked = 0; + + if (tp->snd_cwnd < tp->snd_cwnd_clamp) + tp->snd_cwnd++; +} + + static inline void tcp_sync_left_out(struct tcp_sock *tp) { if (tp->rx_opt.sack_ok && @@ -793,6 +822,7 @@ static inline void tcp_enter_cwr(struct sock *sk) struct tcp_sock *tp = tcp_sk(sk); tp->prior_ssthresh = 0; + tp->bytes_acked = 0; if (inet_csk(sk)->icsk_ca_state < TCP_CA_CWR) { __tcp_enter_cwr(sk); tcp_set_ca_state(sk, TCP_CA_CWR); @@ -809,6 +839,27 @@ static __inline__ __u32 tcp_max_burst(const struct tcp_sock *tp) return 3; } +/* RFC2861 Check whether we are limited by application or congestion window + * This is the inverse of cwnd check in tcp_tso_should_defer + */ +static inline int tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight) +{ + const struct tcp_sock *tp = tcp_sk(sk); + u32 left; + + if (in_flight >= tp->snd_cwnd) + return 1; + + if (!(sk->sk_route_caps & NETIF_F_TSO)) + return 0; + + left = tp->snd_cwnd - in_flight; + if (sysctl_tcp_tso_win_divisor) + return left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd; + else + return left <= tcp_max_burst(tp); +} + static __inline__ void tcp_minshall_update(struct tcp_sock *tp, int mss, const struct sk_buff *skb) { @@ -852,7 +903,7 @@ static __inline__ u16 tcp_v4_check(struct tcphdr *th, int len, static __inline__ int __tcp_checksum_complete(struct sk_buff *skb) { - return (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)); + return __skb_checksum_complete(skb); } static __inline__ int tcp_checksum_complete(struct sk_buff *skb) @@ -1156,6 +1207,15 @@ 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){ + 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; +} + /* /proc */ enum tcp_seq_states { TCP_SEQ_STATE_LISTENING, |