diff options
Diffstat (limited to 'net/ipv4/tcp_output.c')
-rw-r--r-- | net/ipv4/tcp_output.c | 46 |
1 files changed, 28 insertions, 18 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index cfae61b40c4..957c4e3d217 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1992,6 +1992,33 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb) return err; } +static int tcp_can_forward_retransmit(struct sock *sk) +{ + const struct inet_connection_sock *icsk = inet_csk(sk); + struct tcp_sock *tp = tcp_sk(sk); + + /* Forward retransmissions are possible only during Recovery. */ + if (icsk->icsk_ca_state != TCP_CA_Recovery) + return 0; + + /* No forward retransmissions in Reno are possible. */ + if (tcp_is_reno(tp)) + return 0; + + /* Yeah, we have to make difficult choice between forward transmission + * and retransmission... Both ways have their merits... + * + * For now we do not retransmit anything, while we have some new + * segments to send. In the other cases, follow rule 3 for + * NextSeg() specified in RFC3517. + */ + + if (tcp_may_send_now(sk)) + return 0; + + return 1; +} + /* This gets called after a retransmit timeout, and the initially * retransmitted data is acknowledged. It tries to continue * resending the rest of the retransmit queue, until either @@ -2057,24 +2084,7 @@ void tcp_xmit_retransmit_queue(struct sock *sk) } /* OK, demanded retransmission is finished. */ - - /* Forward retransmissions are possible only during Recovery. */ - if (icsk->icsk_ca_state != TCP_CA_Recovery) - return; - - /* No forward retransmissions in Reno are possible. */ - if (tcp_is_reno(tp)) - return; - - /* Yeah, we have to make difficult choice between forward transmission - * and retransmission... Both ways have their merits... - * - * For now we do not retransmit anything, while we have some new - * segments to send. In the other cases, follow rule 3 for - * NextSeg() specified in RFC3517. - */ - - if (tcp_may_send_now(sk)) + if (!tcp_can_forward_retransmit(sk)) return; /* If nothing is SACKed, highest_sack in the loop won't be valid */ |