diff options
Diffstat (limited to 'net/ipv4/tcp_yeah.h')
| -rw-r--r-- | net/ipv4/tcp_yeah.h | 131 |
1 files changed, 0 insertions, 131 deletions
diff --git a/net/ipv4/tcp_yeah.h b/net/ipv4/tcp_yeah.h index 33ad5385c188..ed3b7198f23c 100644 --- a/net/ipv4/tcp_yeah.h +++ b/net/ipv4/tcp_yeah.h @@ -5,134 +5,3 @@ #include <asm/div64.h> #include <net/tcp.h> - -/* Vegas variables */ -struct vegas { - u32 beg_snd_nxt; /* right edge during last RTT */ - u32 beg_snd_una; /* left edge during last RTT */ - u32 beg_snd_cwnd; /* saves the size of the cwnd */ - u8 doing_vegas_now;/* if true, do vegas for this RTT */ - u16 cntRTT; /* # of RTTs measured within last RTT */ - u32 minRTT; /* min of RTTs measured within last RTT (in usec) */ - u32 baseRTT; /* the min of all Vegas RTT measurements seen (in usec) */ -}; - -/* There are several situations when we must "re-start" Vegas: - * - * o when a connection is established - * o after an RTO - * o after fast recovery - * o when we send a packet and there is no outstanding - * unacknowledged data (restarting an idle connection) - * - * In these circumstances we cannot do a Vegas calculation at the - * end of the first RTT, because any calculation we do is using - * stale info -- both the saved cwnd and congestion feedback are - * stale. - * - * Instead we must wait until the completion of an RTT during - * which we actually receive ACKs. - */ -static inline void vegas_enable(struct sock *sk) -{ - const struct tcp_sock *tp = tcp_sk(sk); - struct vegas *vegas = inet_csk_ca(sk); - - /* Begin taking Vegas samples next time we send something. */ - vegas->doing_vegas_now = 1; - - /* Set the beginning of the next send window. */ - vegas->beg_snd_nxt = tp->snd_nxt; - - vegas->cntRTT = 0; - vegas->minRTT = 0x7fffffff; -} - -/* Stop taking Vegas samples for now. */ -static inline void vegas_disable(struct sock *sk) -{ - struct vegas *vegas = inet_csk_ca(sk); - - vegas->doing_vegas_now = 0; -} - -static void tcp_vegas_init(struct sock *sk) -{ - struct vegas *vegas = inet_csk_ca(sk); - - vegas->baseRTT = 0x7fffffff; - vegas_enable(sk); -} - -static void tcp_vegas_state(struct sock *sk, u8 ca_state) -{ - - if (ca_state == TCP_CA_Open) - vegas_enable(sk); - else - vegas_disable(sk); -} - -/* Do RTT sampling needed for Vegas. - * Basically we: - * o min-filter RTT samples from within an RTT to get the current - * propagation delay + queuing delay (we are min-filtering to try to - * avoid the effects of delayed ACKs) - * o min-filter RTT samples from a much longer window (forever for now) - * to find the propagation delay (baseRTT) - */ -static void tcp_vegas_pkts_acked(struct sock *sk, u32 cnt, ktime_t last) -{ - struct vegas *vegas = inet_csk_ca(sk); - u32 vrtt; - - /* Never allow zero rtt or baseRTT */ - vrtt = (ktime_to_ns(net_timedelta(last)) / NSEC_PER_USEC) + 1; - - /* Filter to find propagation delay: */ - if (vrtt < vegas->baseRTT) - vegas->baseRTT = vrtt; - - /* Find the min RTT during the last RTT to find - * the current prop. delay + queuing delay: - */ - vegas->minRTT = min(vegas->minRTT, vrtt); - vegas->cntRTT++; -} - -/* - * If the connection is idle and we are restarting, - * then we don't want to do any Vegas calculations - * until we get fresh RTT samples. So when we - * restart, we reset our Vegas state to a clean - * slate. After we get acks for this flight of - * packets, _then_ we can make Vegas calculations - * again. - */ -static void tcp_vegas_cwnd_event(struct sock *sk, enum tcp_ca_event event) -{ - if (event == CA_EVENT_CWND_RESTART || - event == CA_EVENT_TX_START) - tcp_vegas_init(sk); -} - -/* Extract info for Tcp socket info provided via netlink. */ -static void tcp_vegas_get_info(struct sock *sk, u32 ext, - struct sk_buff *skb) -{ - const struct vegas *ca = inet_csk_ca(sk); - if (ext & (1 << (INET_DIAG_VEGASINFO - 1))) { - struct tcpvegas_info *info; - - info = RTA_DATA(__RTA_PUT(skb, INET_DIAG_VEGASINFO, - sizeof(*info))); - - info->tcpv_enabled = ca->doing_vegas_now; - info->tcpv_rttcnt = ca->cntRTT; - info->tcpv_rtt = ca->baseRTT; - info->tcpv_minrtt = ca->minRTT; - rtattr_failure: ; - } -} - - |