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Diffstat (limited to 'src/vnet/tcp/tcp_input.c')
-rw-r--r--src/vnet/tcp/tcp_input.c29
1 files changed, 18 insertions, 11 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 21e5f3cdaba..0b79a6699d7 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -719,8 +719,7 @@ scoreboard_update_bytes (tcp_connection_t * tc, sack_scoreboard_t * sb)
sack_scoreboard_hole_t *
scoreboard_next_rxt_hole (sack_scoreboard_t * sb,
sack_scoreboard_hole_t * start,
- u8 have_sent_1_smss,
- u8 * can_rescue, u8 * snd_limited)
+ u8 have_unsent, u8 * can_rescue, u8 * snd_limited)
{
sack_scoreboard_hole_t *hole = 0;
@@ -742,11 +741,11 @@ scoreboard_next_rxt_hole (sack_scoreboard_t * sb,
}
else
{
- /* Rule (2): output takes care of transmitting new data */
- if (!have_sent_1_smss)
+ /* Rule (2): available unsent data */
+ if (have_unsent)
{
- hole = 0;
sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
+ return 0;
}
/* Rule (3): if hole not lost */
else if (seq_lt (hole->start, sb->high_sacked))
@@ -772,16 +771,17 @@ scoreboard_next_rxt_hole (sack_scoreboard_t * sb,
}
static void
-scoreboard_init_high_rxt (sack_scoreboard_t * sb, u32 seq)
+scoreboard_init_high_rxt (sack_scoreboard_t * sb, u32 snd_una)
{
sack_scoreboard_hole_t *hole;
hole = scoreboard_first_hole (sb);
if (hole)
{
- seq = seq_gt (seq, hole->start) ? seq : hole->start;
+ snd_una = seq_gt (snd_una, hole->start) ? snd_una : hole->start;
sb->cur_rxt_hole = sb->head;
}
- sb->high_rxt = seq;
+ sb->high_rxt = snd_una;
+ sb->rescue_rxt = snd_una - 1;
}
void
@@ -1306,7 +1306,6 @@ tcp_cc_handle_event (tcp_connection_t * tc, u32 is_dack)
{
tc->cwnd = tc->ssthresh;
scoreboard_init_high_rxt (&tc->sack_sb, tc->snd_una);
- tc->sack_sb.rescue_rxt = tc->snd_una - 1;
}
else
{
@@ -1316,6 +1315,7 @@ tcp_cc_handle_event (tcp_connection_t * tc, u32 is_dack)
tc->cwnd = tc->ssthresh + 3 * tc->snd_mss;
}
+ /* Constrain rate until we get a partial ack */
pacer_wnd = clib_max (0.1 * tc->cwnd, 2 * tc->snd_mss);
tcp_connection_tx_pacer_reset (tc, pacer_wnd,
0 /* start bucket */ );
@@ -1387,6 +1387,10 @@ partial_ack:
* Legitimate ACK. 2) If PARTIAL ACK try to retransmit
*/
+ /* Update the pacing rate. For the first partial ack we move from
+ * the artificially constrained rate to the one after congestion */
+ tcp_connection_tx_pacer_update (tc);
+
/* XXX limit this only to first partial ack? */
tcp_retransmit_timer_force_update (tc);
@@ -1422,10 +1426,14 @@ partial_ack:
{
/* Apparently all retransmitted holes have been acked */
tc->snd_rxt_bytes = 0;
+ tc->sack_sb.high_rxt = tc->snd_una;
}
}
else
{
+ tcp_fastrecovery_first_on (tc);
+ /* Reuse last bytes delivered to track total bytes acked */
+ tc->sack_sb.last_bytes_delivered += tc->bytes_acked;
if (tc->snd_rxt_bytes > tc->bytes_acked)
tc->snd_rxt_bytes -= tc->bytes_acked;
else
@@ -1473,7 +1481,7 @@ tcp_rcv_ack (tcp_connection_t * tc, vlib_buffer_t * b,
{
tcp_make_ack (tc, b);
*next = tcp_next_output (tc->c_is_ip4);
- *error = TCP_ERROR_ACK_INVALID;
+ *error = TCP_ERROR_ACK_FUTURE;
TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 0,
vnet_buffer (b)->tcp.ack_number);
return -1;
@@ -1483,7 +1491,6 @@ tcp_rcv_ack (tcp_connection_t * tc, vlib_buffer_t * b,
vnet_buffer (b)->tcp.ack_number);
tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
- *error = TCP_ERROR_ACK_FUTURE;
}
/* If old ACK, probably it's an old dupack */