diff options
| -rw-r--r-- | include/linux/tcp.h | 1 | ||||
| -rw-r--r-- | include/net/tcp.h | 1 | ||||
| -rw-r--r-- | net/ipv4/tcp_input.c | 65 |
3 files changed, 1 insertions, 66 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 5adbc33d1ab3..472120b4fac5 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -246,7 +246,6 @@ struct tcp_sock { /* from STCP, retrans queue hinting */ struct sk_buff* lost_skb_hint; - struct sk_buff *scoreboard_skb_hint; struct sk_buff *retransmit_skb_hint; struct sk_buff_head out_of_order_queue; /* Out of order segments go here */ diff --git a/include/net/tcp.h b/include/net/tcp.h index 5bba80fbd1d9..e1c3723f161f 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1193,7 +1193,6 @@ static inline void tcp_mib_init(struct net *net) static inline void tcp_clear_retrans_hints_partial(struct tcp_sock *tp) { tp->lost_skb_hint = NULL; - tp->scoreboard_skb_hint = NULL; } static inline void tcp_clear_all_retrans_hints(struct tcp_sock *tp) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index b358e8c98607..d7d369428ae4 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -1255,8 +1255,6 @@ static bool tcp_shifted_skb(struct sock *sk, struct sk_buff *skb, if (skb == tp->retransmit_skb_hint) tp->retransmit_skb_hint = prev; - if (skb == tp->scoreboard_skb_hint) - tp->scoreboard_skb_hint = prev; if (skb == tp->lost_skb_hint) { tp->lost_skb_hint = prev; tp->lost_cnt_hint -= tcp_skb_pcount(prev); @@ -1964,20 +1962,6 @@ static bool tcp_pause_early_retransmit(struct sock *sk, int flag) return true; } -static inline int tcp_skb_timedout(const struct sock *sk, - const struct sk_buff *skb) -{ - return tcp_time_stamp - TCP_SKB_CB(skb)->when > inet_csk(sk)->icsk_rto; -} - -static inline int tcp_head_timedout(const struct sock *sk) -{ - const struct tcp_sock *tp = tcp_sk(sk); - - return tp->packets_out && - tcp_skb_timedout(sk, tcp_write_queue_head(sk)); -} - /* Linux NewReno/SACK/FACK/ECN state machine. * -------------------------------------- * @@ -2084,12 +2068,6 @@ static bool tcp_time_to_recover(struct sock *sk, int flag) if (tcp_dupack_heuristics(tp) > tp->reordering) return true; - /* Trick#3 : when we use RFC2988 timer restart, fast - * retransmit can be triggered by timeout of queue head. - */ - if (tcp_is_fack(tp) && tcp_head_timedout(sk)) - return true; - /* Trick#4: It is still not OK... But will it be useful to delay * recovery more? */ @@ -2126,44 +2104,6 @@ static bool tcp_time_to_recover(struct sock *sk, int flag) return false; } -/* New heuristics: it is possible only after we switched to restart timer - * each time when something is ACKed. Hence, we can detect timed out packets - * during fast retransmit without falling to slow start. - * - * Usefulness of this as is very questionable, since we should know which of - * the segments is the next to timeout which is relatively expensive to find - * in general case unless we add some data structure just for that. The - * current approach certainly won't find the right one too often and when it - * finally does find _something_ it usually marks large part of the window - * right away (because a retransmission with a larger timestamp blocks the - * loop from advancing). -ij - */ -static void tcp_timeout_skbs(struct sock *sk) -{ - struct tcp_sock *tp = tcp_sk(sk); - struct sk_buff *skb; - - if (!tcp_is_fack(tp) || !tcp_head_timedout(sk)) - return; - - skb = tp->scoreboard_skb_hint; - if (tp->scoreboard_skb_hint == NULL) - skb = tcp_write_queue_head(sk); - - tcp_for_write_queue_from(skb, sk) { - if (skb == tcp_send_head(sk)) - break; - if (!tcp_skb_timedout(sk, skb)) - break; - - tcp_skb_mark_lost(tp, skb); - } - - tp->scoreboard_skb_hint = skb; - - tcp_verify_left_out(tp); -} - /* Detect loss in event "A" above by marking head of queue up as lost. * For FACK or non-SACK(Reno) senders, the first "packets" number of segments * are considered lost. For RFC3517 SACK, a segment is considered lost if it @@ -2249,8 +2189,6 @@ static void tcp_update_scoreboard(struct sock *sk, int fast_rexmit) else if (fast_rexmit) tcp_mark_head_lost(sk, 1, 1); } - - tcp_timeout_skbs(sk); } /* CWND moderation, preventing bursts due to too big ACKs @@ -2842,7 +2780,7 @@ static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked, fast_rexmit = 1; } - if (do_lost || (tcp_is_fack(tp) && tcp_head_timedout(sk))) + if (do_lost) tcp_update_scoreboard(sk, fast_rexmit); tcp_cwnd_reduction(sk, newly_acked_sacked, fast_rexmit); tcp_xmit_retransmit_queue(sk); @@ -3075,7 +3013,6 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets, tcp_unlink_write_queue(skb, sk); sk_wmem_free_skb(sk, skb); - tp->scoreboard_skb_hint = NULL; if (skb == tp->retransmit_skb_hint) tp->retransmit_skb_hint = NULL; if (skb == tp->lost_skb_hint) |