diff options
Diffstat (limited to 'src/vnet/tcp/tcp.c')
| -rw-r--r-- | src/vnet/tcp/tcp.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c index e0b67a8e5e5..5c554bac5a9 100644 --- a/src/vnet/tcp/tcp.c +++ b/src/vnet/tcp/tcp.c @@ -726,15 +726,25 @@ tcp_round_snd_space (tcp_connection_t * tc, u32 snd_space) u32 tcp_snd_space (tcp_connection_t * tc) { - int snd_space; + int snd_space, snt_limited; - /* If we haven't gotten dupacks or if we did and have gotten sacked bytes - * then we can still send */ - if (PREDICT_TRUE (tcp_in_cong_recovery (tc) == 0 - && (tc->rcv_dupacks == 0 - || tc->sack_sb.last_sacked_bytes))) + if (PREDICT_TRUE (tcp_in_cong_recovery (tc) == 0)) { snd_space = tcp_available_snd_space (tc); + + /* If we haven't gotten dupacks or if we did and have gotten sacked + * bytes then we can still send as per Limited Transmit (RFC3042) */ + if (PREDICT_FALSE (tc->rcv_dupacks != 0 + && (tcp_opts_sack_permitted (tc) + && tc->sack_sb.last_sacked_bytes == 0))) + { + if (tc->rcv_dupacks == 1 && tc->limited_transmit != tc->snd_nxt) + tc->limited_transmit = tc->snd_nxt; + ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt)); + + snt_limited = tc->snd_nxt - tc->limited_transmit; + snd_space = clib_max (2 * tc->snd_mss - snt_limited, 0); + } return tcp_round_snd_space (tc, snd_space); } |