u32
tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state)
{
- u32 available_space, max_fifo, observed_wnd;
-
if (state < TCP_STATE_ESTABLISHED)
return tcp_initial_window_to_advertise (tc);
+ tcp_update_rcv_wnd (tc);
+
+ if (tc->rcv_wnd == 0)
+ {
+ tc->flags |= TCP_CONN_SENT_RCV_WND0;
+ }
+ else
+ {
+ tc->flags &= ~TCP_CONN_SENT_RCV_WND0;
+ }
+
+ return tc->rcv_wnd >> tc->rcv_wscale;
+}
+
+void
+tcp_update_rcv_wnd (tcp_connection_t * tc)
+{
+ i32 observed_wnd;
+ u32 available_space, max_fifo, wnd;
+
/*
* Figure out how much space we have available
*/
- available_space = stream_session_max_enqueue (&tc->connection);
+ available_space = stream_session_max_rx_enqueue (&tc->connection);
max_fifo = stream_session_fifo_size (&tc->connection);
ASSERT (tc->opt.mss < max_fifo);
* Use the above and what we know about what we've previously advertised
* to compute the new window
*/
- observed_wnd = tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
+ observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
+ if (observed_wnd < 0)
+ observed_wnd = 0;
/* Bad. Thou shalt not shrink */
if (available_space < observed_wnd)
{
- if (available_space == 0)
- clib_warning ("Didn't shrink rcv window despite not having space");
+ /* Does happen! */
+ wnd = observed_wnd;
}
-
- tc->rcv_wnd = clib_min (available_space, TCP_WND_MAX << tc->rcv_wscale);
-
- if (tc->rcv_wnd == 0)
+ else
{
- tc->flags |= TCP_CONN_SENT_RCV_WND0;
+ wnd = available_space;
}
- return tc->rcv_wnd >> tc->rcv_wscale;
+ if (wnd && ((wnd << tc->rcv_wscale) >> tc->rcv_wscale != wnd))
+ wnd += 1 << tc->rcv_wscale;
+
+ tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
}
/**
#define tcp_get_free_buffer_index(tm, bidx) \
do { \
u32 *my_tx_buffers, n_free_buffers; \
- u32 cpu_index = tm->vlib_main->cpu_index; \
+ u32 cpu_index = os_get_cpu_number(); \
my_tx_buffers = tm->tx_buffers[cpu_index]; \
if (PREDICT_FALSE(vec_len (my_tx_buffers) == 0)) \
{ \
_vec_len (my_tx_buffers) -= 1; \
} while (0)
+#define tcp_return_buffer(tm) \
+do { \
+ u32 *my_tx_buffers; \
+ u32 cpu_index = os_get_cpu_number(); \
+ my_tx_buffers = tm->tx_buffers[cpu_index]; \
+ _vec_len (my_tx_buffers) +=1; \
+} while (0)
+
always_inline void
tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
{
tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd);
tcp_options_write ((u8 *) (th + 1), snd_opts);
-
- /* Mark as ACK */
vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
}
void
tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b)
{
- tcp_main_t *tm = vnet_get_tcp_main ();
- vlib_main_t *vm = tm->vlib_main;
+ vlib_main_t *vm = vlib_get_main ();
tcp_reuse_buffer (vm, b);
tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK);
vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
+ TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc);
}
/**
void
tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b)
{
- tcp_main_t *tm = vnet_get_tcp_main ();
- vlib_main_t *vm = tm->vlib_main;
+ vlib_main_t *vm = vlib_get_main ();
u8 flags = 0;
tcp_reuse_buffer (vm, b);
void
tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b)
{
- tcp_main_t *tm = vnet_get_tcp_main ();
- vlib_main_t *vm = tm->vlib_main;
+ vlib_main_t *vm = vlib_get_main ();
tcp_options_t _snd_opts, *snd_opts = &_snd_opts;
u8 tcp_opts_len, tcp_hdr_opts_len;
tcp_header_t *th;
vlib_buffer_t *b;
u32 bi;
tcp_main_t *tm = vnet_get_tcp_main ();
- vlib_main_t *vm = tm->vlib_main;
+ vlib_main_t *vm = vlib_get_main ();
u8 tcp_hdr_len, flags = 0;
tcp_header_t *th, *pkt_th;
u32 seq, ack;
vlib_buffer_t *b;
u32 bi;
tcp_main_t *tm = vnet_get_tcp_main ();
- vlib_main_t *vm = tm->vlib_main;
+ vlib_main_t *vm = vlib_get_main ();
u8 tcp_hdr_opts_len, tcp_opts_len;
tcp_header_t *th;
u32 time_now;
/* Decide where to send the packet */
next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
- f = vlib_get_frame_to_node (vm, next_index);
/* Enqueue the packet */
+ f = vlib_get_frame_to_node (vm, next_index);
to_next = vlib_frame_vector_args (f);
to_next[0] = bi;
f->n_vectors = 1;
vlib_buffer_t *b;
u32 bi;
tcp_main_t *tm = vnet_get_tcp_main ();
- vlib_main_t *vm = tm->vlib_main;
+ vlib_main_t *vm = vlib_get_main ();
tcp_get_free_buffer_index (tm, &bi);
b = vlib_get_buffer (vm, bi);
vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
tc->snd_nxt += data_len;
+ /* TODO this is updated in output as well ... */
+ if (tc->snd_nxt > tc->snd_una_max)
+ tc->snd_una_max = tc->snd_nxt;
TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
}
-/* Send delayed ACK when timer expires */
void
-tcp_timer_delack_handler (u32 index)
+tcp_send_ack (tcp_connection_t * tc)
{
tcp_main_t *tm = vnet_get_tcp_main ();
- vlib_main_t *vm = tm->vlib_main;
- u32 thread_index = os_get_cpu_number ();
- tcp_connection_t *tc;
+ vlib_main_t *vm = vlib_get_main ();
+
vlib_buffer_t *b;
u32 bi;
- tc = tcp_connection_get (index, thread_index);
-
/* Get buffer */
tcp_get_free_buffer_index (tm, &bi);
b = vlib_get_buffer (vm, bi);
/* Fill in the ACK */
tcp_make_ack (tc, b);
- tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
- tc->flags &= ~TCP_CONN_DELACK;
-
tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
}
+/* Send delayed ACK when timer expires */
+void
+tcp_timer_delack_handler (u32 index)
+{
+ u32 thread_index = os_get_cpu_number ();
+ tcp_connection_t *tc;
+
+ tc = tcp_connection_get (index, thread_index);
+ tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID;
+// tc->flags &= ~TCP_CONN_DELACK;
+ tcp_send_ack (tc);
+}
+
/** Build a retransmit segment
*
* @return the number of bytes in the segment or 0 if there's nothing to
* */
u32
tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b,
- u32 max_bytes)
+ u32 offset, u32 max_bytes)
{
- tcp_main_t *tm = vnet_get_tcp_main ();
- vlib_main_t *vm = tm->vlib_main;
- u32 n_bytes, offset = 0;
- sack_scoreboard_hole_t *hole;
- u32 hole_size;
+ vlib_main_t *vm = vlib_get_main ();
+ u32 n_bytes = 0;
tcp_reuse_buffer (vm, b);
ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
ASSERT (max_bytes != 0);
- if (tcp_opts_sack_permitted (&tc->opt))
- {
- /* XXX get first hole not retransmitted yet */
- hole = scoreboard_first_hole (&tc->sack_sb);
- if (!hole)
- return 0;
-
- offset = hole->start - tc->snd_una;
- hole_size = hole->end - hole->start;
+ max_bytes = clib_min (tc->snd_mss, max_bytes);
- ASSERT (hole_size);
+ /* Start is beyond snd_congestion */
+ if (seq_geq (tc->snd_una + offset, tc->snd_congestion))
+ goto done;
- if (hole_size < max_bytes)
- max_bytes = hole_size;
- }
- else
+ /* Don't overshoot snd_congestion */
+ if (seq_gt (tc->snd_nxt + max_bytes, tc->snd_congestion))
{
- if (seq_geq (tc->snd_nxt, tc->snd_una_max))
- return 0;
+ max_bytes = tc->snd_congestion - tc->snd_nxt;
+ if (max_bytes == 0)
+ goto done;
}
+ ASSERT (max_bytes <= tc->snd_mss);
+
n_bytes = stream_session_peek_bytes (&tc->connection,
vlib_buffer_get_current (b), offset,
max_bytes);
ASSERT (n_bytes != 0);
-
+ b->current_length = n_bytes;
tcp_push_hdr_i (tc, b, tc->state);
+done:
+ TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
return n_bytes;
}
+/**
+ * Reset congestion control, switch cwnd to loss window and try again.
+ */
+static void
+tcp_rtx_timeout_cc_recover (tcp_connection_t * tc)
+{
+ /* Cleanly recover cc (also clears up fast retransmit) */
+ if (tcp_in_fastrecovery (tc))
+ {
+ tcp_cc_recover (tc);
+ }
+ else
+ {
+ tc->ssthresh = clib_max (tcp_flight_size (tc) / 2, 2 * tc->snd_mss);
+ }
+
+ /* Start again from the beginning */
+ tc->cwnd = tcp_loss_wnd (tc);
+ tc->snd_congestion = tc->snd_una_max;
+}
+
static void
tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
{
tcp_main_t *tm = vnet_get_tcp_main ();
- vlib_main_t *vm = tm->vlib_main;
+ vlib_main_t *vm = vlib_get_main ();
u32 thread_index = os_get_cpu_number ();
tcp_connection_t *tc;
vlib_buffer_t *b;
- u32 bi, max_bytes, snd_space;
+ u32 bi, snd_space, n_bytes;
if (is_syn)
{
if (tc->state >= TCP_STATE_ESTABLISHED)
{
- tcp_fastrecovery_off (tc);
+ /* First retransmit timeout */
+ if (tc->rto_boff == 1)
+ tcp_rtx_timeout_cc_recover (tc);
/* Exponential backoff */
tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
/* Figure out what and how many bytes we can send */
snd_space = tcp_available_snd_space (tc);
- max_bytes = clib_min (tc->snd_mss, snd_space);
- if (max_bytes == 0)
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
+
+ if (snd_space == 0)
{
clib_warning ("no wnd to retransmit");
+ tcp_return_buffer (tm);
+
+ /* Force one segment */
+ tcp_retransmit_first_unacked (tc);
+
+ /* Re-enable retransmit timer. Output may be unwilling
+ * to do it for us */
+ tcp_retransmit_timer_set (tc);
+
return;
}
- tcp_prepare_retransmit_segment (tc, b, max_bytes);
+ else
+ {
+ /* No fancy recovery for now! */
+ n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, snd_space);
+ scoreboard_clear (&tc->sack_sb);
- tc->rtx_bytes += max_bytes;
+ if (n_bytes == 0)
+ return;
- /* No fancy recovery for now! */
- scoreboard_clear (&tc->sack_sb);
+ tc->rtx_bytes += n_bytes;
+ }
}
else
{
}
/**
- * Retansmit first unacked segment */
+ * Retransmit first unacked segment
+ */
void
tcp_retransmit_first_unacked (tcp_connection_t * tc)
{
tcp_main_t *tm = vnet_get_tcp_main ();
- u32 snd_nxt = tc->snd_nxt;
+ vlib_main_t *vm = vlib_get_main ();
vlib_buffer_t *b;
- u32 bi;
+ u32 bi, n_bytes;
tc->snd_nxt = tc->snd_una;
/* Get buffer */
tcp_get_free_buffer_index (tm, &bi);
- b = vlib_get_buffer (tm->vlib_main, bi);
+ b = vlib_get_buffer (vm, bi);
+
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
- tcp_prepare_retransmit_segment (tc, b, tc->snd_mss);
- tcp_enqueue_to_output (tm->vlib_main, b, bi, tc->c_is_ip4);
+ n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss);
+ if (n_bytes == 0)
+ return;
- tc->snd_nxt = snd_nxt;
- tc->rtx_bytes += tc->snd_mss;
+ tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ tc->rtx_bytes += n_bytes;
+}
+
+sack_scoreboard_hole_t *
+scoreboard_first_rtx_hole (sack_scoreboard_t * sb)
+{
+ sack_scoreboard_hole_t *hole = 0;
+
+// hole = scoreboard_first_hole (&tc->sack_sb);
+// if (hole)
+// {
+//
+// offset = hole->start - tc->snd_una;
+// hole_size = hole->end - hole->start;
+//
+// ASSERT(hole_size);
+//
+// if (hole_size < max_bytes)
+// max_bytes = hole_size;
+// }
+ return hole;
}
+/**
+ * Do fast retransmit.
+ */
void
tcp_fast_retransmit (tcp_connection_t * tc)
{
tcp_main_t *tm = vnet_get_tcp_main ();
- u32 snd_space, max_bytes, n_bytes, bi;
+ vlib_main_t *vm = vlib_get_main ();
+ u32 bi;
+ int snd_space;
+ u32 n_written = 0, offset = 0;
vlib_buffer_t *b;
+ u8 use_sacks = 0;
ASSERT (tcp_in_fastrecovery (tc));
- clib_warning ("fast retransmit!");
-
/* Start resending from first un-acked segment */
tc->snd_nxt = tc->snd_una;
snd_space = tcp_available_snd_space (tc);
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
+
+ /* If we have SACKs use them */
+ if (tcp_opts_sack_permitted (&tc->opt)
+ && scoreboard_first_hole (&tc->sack_sb))
+ use_sacks = 0;
- while (snd_space)
+ while (snd_space > 0)
{
tcp_get_free_buffer_index (tm, &bi);
- b = vlib_get_buffer (tm->vlib_main, bi);
+ b = vlib_get_buffer (vm, bi);
+
+ if (use_sacks)
+ {
+ scoreboard_first_rtx_hole (&tc->sack_sb);
+ }
+ else
+ {
+ offset += n_written;
+ }
- max_bytes = clib_min (tc->snd_mss, snd_space);
- n_bytes = tcp_prepare_retransmit_segment (tc, b, max_bytes);
+ n_written = tcp_prepare_retransmit_segment (tc, b, offset, snd_space);
/* Nothing left to retransmit */
- if (n_bytes == 0)
- return;
-
- tcp_enqueue_to_output (tm->vlib_main, b, bi, tc->c_is_ip4);
+ if (n_written == 0)
+ {
+ tcp_return_buffer (tm);
+ break;
+ }
- snd_space -= n_bytes;
+ tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ tc->rtx_bytes += n_written;
+ snd_space -= n_written;
}
- /* If window allows, send new data */
- tc->snd_nxt = tc->snd_una_max;
+ /* If window allows, send 1 SMSS of new data */
+ if (seq_lt (tc->snd_nxt, tc->snd_congestion))
+ tc->snd_nxt = tc->snd_congestion;
}
always_inline u32
if (PREDICT_FALSE
(vnet_buffer (b0)->tcp.flags & TCP_BUF_FLAG_DUPACK))
{
- ASSERT (tc0->snt_dupacks > 0);
- tc0->snt_dupacks--;
if (!tcp_session_has_ooo_data (tc0))
{
error0 = TCP_ERROR_FILTERED_DUPACKS;
tc0->rcv_las = tc0->rcv_nxt;
/* Stop DELACK timer and fix flags */
- tc0->flags &=
- ~(TCP_CONN_SNDACK | TCP_CONN_DELACK | TCP_CONN_BURSTACK);
+ tc0->flags &= ~(TCP_CONN_SNDACK);
if (tcp_timer_is_active (tc0, TCP_TIMER_DELACK))
{
tcp_timer_reset (tc0, TCP_TIMER_DELACK);
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