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authorFlorin Coras <fcoras@cisco.com>2019-10-16 19:28:17 -0700
committerAndrew Yourtchenko <ayourtch@gmail.com>2019-11-05 10:23:52 +0000
commit3d30598b7b4dd6d7dbffc883a96692e90e4320f5 (patch)
tree62fb869363ce6230cfe1ec12d24f0fd5cb106af3
parentefb8db4c8a59ad5c9b66cad6f8b9c7862e3001aa (diff)
tcp: avoid sending acks when data available
Type: fix Change-Id: I02e2cb2d349f9ddb2bfed040a08ca448f379d565 Signed-off-by: Florin Coras <fcoras@cisco.com> (cherry picked from commit cb711a4ec908b89edc9da29d3c2e093dab85fbbf)
-rw-r--r--src/vnet/tcp/tcp.h1
-rwxr-xr-xsrc/vnet/tcp/tcp_input.c5
-rw-r--r--src/vnet/tcp/tcp_output.c23
3 files changed, 24 insertions, 5 deletions
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index 8636a7c85db..657f1bea449 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -786,6 +786,7 @@ void tcp_send_reset (tcp_connection_t * tc);
void tcp_send_syn (tcp_connection_t * tc);
void tcp_send_synack (tcp_connection_t * tc);
void tcp_send_fin (tcp_connection_t * tc);
+void tcp_send_ack (tcp_connection_t * tc);
void tcp_update_burst_snd_vars (tcp_connection_t * tc);
void tcp_update_rto (tcp_connection_t * tc);
void tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4);
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index de59a4da0af..83769465525 100755
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -1687,6 +1687,7 @@ tcp_rcv_fin (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
/* Account for the FIN and send ack */
tc->rcv_nxt += 1;
+ tc->flags |= TCP_CONN_FINRCVD;
tcp_program_ack (tc);
/* Enter CLOSE-WAIT and notify session. To avoid lingering
* in CLOSE-WAIT, set timer (reuse WAITCLOSE). */
@@ -2599,7 +2600,9 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
}
else
{
- tcp_program_ack (new_tc0);
+ /* Send ack now instead of programming it because connection was
+ * just established and it's not optional. */
+ tcp_send_ack (new_tc0);
}
drop:
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 33bfe100a10..2437b7bf28f 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -518,7 +518,6 @@ tcp_compute_checksum (tcp_connection_t * tc, vlib_buffer_t * b)
return checksum;
}
-
/**
* Prepare ACK
*/
@@ -1086,6 +1085,10 @@ tcp_send_fin (tcp_connection_t * tc)
return;
}
+ /* If we have non-dupacks programmed, no need to send them */
+ if ((tc->flags & TCP_CONN_SNDACK) && !tc->pending_dupacks)
+ tc->flags &= ~TCP_CONN_SNDACK;
+
tcp_retransmit_timer_force_update (tc);
b = vlib_get_buffer (vm, bi);
tcp_init_buffer (vm, b);
@@ -1165,7 +1168,6 @@ tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt,
tc->bytes_out += data_len;
tc->data_segs_out += 1;
-
th->checksum = tcp_compute_checksum (tc, b);
TCP_EVT (TCP_EVT_PKTIZE, tc);
@@ -1897,6 +1899,13 @@ tcp_retransmit_should_retry_head (tcp_connection_t * tc,
return (tx_adv_sack > (tc->snd_una - tc->prr_start) * rr);
}
+static inline u8
+tcp_max_tx_deq (tcp_connection_t * tc)
+{
+ return (transport_max_tx_dequeue (&tc->connection)
+ - (tc->snd_nxt - tc->snd_una));
+}
+
#define scoreboard_rescue_rxt_valid(_sb, _tc) \
(seq_geq (_sb->rescue_rxt, _tc->snd_una) \
&& seq_leq (_sb->rescue_rxt, _tc->snd_congestion))
@@ -2161,8 +2170,13 @@ tcp_send_acks (tcp_connection_t * tc, u32 max_burst_size)
if (!tc->pending_dupacks)
{
- tcp_send_ack (tc);
- return 1;
+ if (tcp_in_cong_recovery (tc) || !tcp_max_tx_deq (tc)
+ || tc->state != TCP_STATE_ESTABLISHED)
+ {
+ tcp_send_ack (tc);
+ return 1;
+ }
+ return 0;
}
/* If we're supposed to send dupacks but have no ooo data
@@ -2170,6 +2184,7 @@ tcp_send_acks (tcp_connection_t * tc, u32 max_burst_size)
if (!vec_len (tc->snd_sacks))
{
tcp_send_ack (tc);
+ tc->pending_dupacks = 0;
return 1;
}