void
tcp_connection_reset (tcp_connection_t * tc)
{
- if (tc->state == TCP_STATE_CLOSED)
- return;
+ switch (tc->state)
+ {
+ case TCP_STATE_SYN_RCVD:
+ /* Cleanup everything. App wasn't notified yet */
+ stream_session_delete_notify (&tc->connection);
+ tcp_connection_cleanup (tc);
+ break;
+ case TCP_STATE_SYN_SENT:
+ case TCP_STATE_ESTABLISHED:
+ case TCP_STATE_CLOSE_WAIT:
+ case TCP_STATE_FIN_WAIT_1:
+ case TCP_STATE_FIN_WAIT_2:
+ case TCP_STATE_CLOSING:
+ tc->state = TCP_STATE_CLOSED;
+
+ /* Make sure all timers are cleared */
+ tcp_connection_timers_reset (tc);
+
+ stream_session_reset_notify (&tc->connection);
+ break;
+ case TCP_STATE_CLOSED:
+ return;
+ }
- tc->state = TCP_STATE_CLOSED;
- stream_session_reset_notify (&tc->connection);
}
/**
TCP_EVT_DBG (TCP_EVT_CLOSE, tc);
/* Send FIN if needed */
- if (tc->state == TCP_STATE_ESTABLISHED || tc->state == TCP_STATE_SYN_RCVD
- || tc->state == TCP_STATE_CLOSE_WAIT)
+ if (tc->state == TCP_STATE_ESTABLISHED
+ || tc->state == TCP_STATE_SYN_RCVD || tc->state == TCP_STATE_CLOSE_WAIT)
tcp_send_fin (tc);
/* Switch state */
tcp_connection_init_vars (tcp_connection_t * tc)
{
tcp_connection_timers_init (tc);
- tcp_set_snd_mss (tc);
+ tcp_init_mss (tc);
scoreboard_init (&tc->sack_sb);
tcp_cc_init (tc);
}
u8 *
format_tcp_state (u8 * s, va_list * args)
{
- tcp_state_t *state = va_arg (*args, tcp_state_t *);
+ u32 state = va_arg (*args, u32);
- if (*state < TCP_N_STATES)
- s = format (s, "%s", tcp_fsm_states[*state]);
+ if (state < TCP_N_STATES)
+ s = format (s, "%s", tcp_fsm_states[state]);
else
- s = format (s, "UNKNOWN (%d (0x%x))", *state, *state);
-
+ s = format (s, "UNKNOWN (%d (0x%x))", state, state);
return s;
}
format_tcp_timers (u8 * s, va_list * args)
{
tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
- int i, last = 0;
+ int i, last = -1;
for (i = 0; i < TCP_N_TIMERS; i++)
if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID)
s = format (s, "%s,", tcp_conn_timers[i]);
}
- if (last > 0)
+ if (last >= 0)
s = format (s, "%s]", tcp_conn_timers[i]);
else
s = format (s, "]");
}
u8 *
-format_tcp_connection (u8 * s, va_list * args)
+format_tcp_congestion_status (u8 * s, va_list * args)
+{
+ tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
+ if (tcp_in_recovery (tc))
+ s = format (s, "recovery");
+ else if (tcp_in_fastrecovery (tc))
+ s = format (s, "fastrecovery");
+ else
+ s = format (s, "none");
+ return s;
+}
+
+u8 *
+format_tcp_vars (u8 * s, va_list * args)
+{
+ tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
+ s = format (s, " snd_una %u snd_nxt %u snd_una_max %u\n",
+ tc->snd_una - tc->iss, tc->snd_nxt - tc->iss,
+ tc->snd_una_max - tc->iss);
+ s = format (s, " rcv_nxt %u rcv_las %u\n",
+ tc->rcv_nxt - tc->irs, tc->rcv_las - tc->irs);
+ s = format (s, " snd_wnd %u rcv_wnd %u snd_wl1 %u snd_wl2 %u\n",
+ tc->snd_wnd, tc->rcv_wnd, tc->snd_wl1 - tc->irs,
+ tc->snd_wl2 - tc->iss);
+ s = format (s, " flight size %u send space %u rcv_wnd_av %d\n",
+ tcp_flight_size (tc), tcp_available_snd_space (tc),
+ tcp_rcv_wnd_available (tc));
+ s = format (s, " cong %U ", format_tcp_congestion_status, tc);
+ s = format (s, "cwnd %u ssthresh %u rtx_bytes %u bytes_acked %u\n",
+ tc->cwnd, tc->ssthresh, tc->snd_rxt_bytes, tc->bytes_acked);
+ s = format (s, " prev_ssthresh %u snd_congestion %u dupack %u\n",
+ tc->prev_ssthresh, tc->snd_congestion - tc->iss,
+ tc->rcv_dupacks);
+ s = format (s, " rto %u rto_boff %u srtt %u rttvar %u rtt_ts %u ", tc->rto,
+ tc->rto_boff, tc->srtt, tc->rttvar, tc->rtt_ts);
+ s = format (s, "rtt_seq %u\n", tc->rtt_seq);
+ s = format (s, " scoreboard: %U\n", format_tcp_scoreboard, &tc->sack_sb);
+ if (vec_len (tc->snd_sacks))
+ s = format (s, " sacks tx: %U\n", format_tcp_sacks, tc);
+
+ return s;
+}
+
+u8 *
+format_tcp_connection_id (u8 * s, va_list * args)
{
tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
if (!tc)
}
u8 *
-format_tcp_connection_verbose (u8 * s, va_list * args)
+format_tcp_connection (u8 * s, va_list * args)
{
tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
- s = format (s, "%U %U %U", format_tcp_connection, tc, format_tcp_state,
- &tc->state, format_tcp_timers, tc);
+ u32 verbose = va_arg (*args, u32);
+
+ s = format (s, "%-50U", format_tcp_connection_id, tc);
+ if (verbose)
+ {
+ s = format (s, "%-15U", format_tcp_state, tc->state);
+ if (verbose > 1)
+ s = format (s, " %U\n%U", format_tcp_timers, tc, format_tcp_vars, tc);
+ }
return s;
}
{
u32 tci = va_arg (*args, u32);
u32 thread_index = va_arg (*args, u32);
+ u32 verbose = va_arg (*args, u32);
tcp_connection_t *tc;
tc = tcp_connection_get (tci, thread_index);
if (tc)
- return format (s, "%U", format_tcp_connection, tc);
+ s = format (s, "%U", format_tcp_connection, tc, verbose);
else
- return format (s, "empty");
+ s = format (s, "empty");
+ return s;
}
u8 *
{
u32 tci = va_arg (*args, u32);
tcp_connection_t *tc = tcp_listener_get (tci);
- return format (s, "%U", format_tcp_connection, tc);
+ return format (s, "%U", format_tcp_connection_id, tc);
}
u8 *
{
u32 tci = va_arg (*args, u32);
tcp_connection_t *tc = tcp_half_open_connection_get (tci);
- return format (s, "%U", format_tcp_connection, tc);
+ return format (s, "%U", format_tcp_connection_id, tc);
+}
+
+u8 *
+format_tcp_sacks (u8 * s, va_list * args)
+{
+ tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
+ sack_block_t *sacks = tc->snd_sacks;
+ sack_block_t *block;
+ vec_foreach (block, sacks)
+ {
+ s = format (s, " start %u end %u\n", block->start - tc->irs,
+ block->end - tc->irs);
+ }
+ return s;
+}
+
+u8 *
+format_tcp_sack_hole (u8 * s, va_list * args)
+{
+ sack_scoreboard_hole_t *hole = va_arg (*args, sack_scoreboard_hole_t *);
+ s = format (s, "[%u, %u]", hole->start, hole->end);
+ return s;
+}
+
+u8 *
+format_tcp_scoreboard (u8 * s, va_list * args)
+{
+ sack_scoreboard_t *sb = va_arg (*args, sack_scoreboard_t *);
+ sack_scoreboard_hole_t *hole;
+ s = format (s, "sacked_bytes %u last_sacked_bytes %u lost_bytes %u\n",
+ sb->sacked_bytes, sb->last_sacked_bytes, sb->lost_bytes);
+ s = format (s, " last_bytes_delivered %u high_sacked %u snd_una_adv %u\n",
+ sb->last_bytes_delivered, sb->high_sacked, sb->snd_una_adv);
+ s = format (s, " cur_rxt_hole %u high_rxt %u rescue_rxt %u",
+ sb->cur_rxt_hole, sb->high_rxt, sb->rescue_rxt);
+
+ hole = scoreboard_first_hole (sb);
+ if (hole)
+ s = format (s, "\n head %u tail %u holes:\n", sb->head, sb->tail);
+
+ while (hole)
+ {
+ s = format (s, "%U", format_tcp_sack_hole, hole);
+ hole = scoreboard_next_hole (sb, hole);
+ }
+ return s;
}
transport_connection_t *
return &tc->connection;
}
+/**
+ * Compute maximum segment size for session layer.
+ *
+ * Since the result needs to be the actual data length, it first computes
+ * the tcp options to be used in the next burst and subtracts their
+ * length from the connection's snd_mss.
+ */
u16
tcp_session_send_mss (transport_connection_t * trans_conn)
{
tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
+
+ /* Ensure snd_mss does accurately reflect the amount of data we can push
+ * in a segment. This also makes sure that options are updated according to
+ * the current state of the connection. */
+ tcp_update_snd_mss (tc);
+
return tc->snd_mss;
}
+always_inline u32
+tcp_round_snd_space (tcp_connection_t * tc, u32 snd_space)
+{
+ if (tc->snd_wnd < tc->snd_mss)
+ {
+ return tc->snd_wnd <= snd_space ? tc->snd_wnd : 0;
+ }
+
+ /* If we can't write at least a segment, don't try at all */
+ if (snd_space < tc->snd_mss)
+ return 0;
+
+ /* round down to mss multiple */
+ return snd_space - (snd_space % tc->snd_mss);
+}
+
/**
* Compute tx window session is allowed to fill.
+ *
+ * Takes into account available send space, snd_mss and the congestion
+ * state of the connection. If possible, the value returned is a multiple
+ * of snd_mss.
+ *
+ * @param tc tcp connection
+ * @return number of bytes session is allowed to write
*/
u32
-tcp_session_send_space (transport_connection_t * trans_conn)
+tcp_snd_space (tcp_connection_t * tc)
{
- u32 snd_space, chunk;
- tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
+ int snd_space;
/* 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_fastrecovery (tc) == 0
+ if (PREDICT_TRUE (tcp_in_cong_recovery (tc) == 0
&& (tc->rcv_dupacks == 0
|| tc->sack_sb.last_sacked_bytes)))
{
- chunk = tc->snd_wnd > tc->snd_mss ? tc->snd_mss : tc->snd_wnd;
snd_space = tcp_available_snd_space (tc);
+ return tcp_round_snd_space (tc, snd_space);
+ }
- /* If we can't write at least a segment, don't try at all */
- if (chunk == 0 || snd_space < chunk)
+ if (tcp_in_recovery (tc))
+ {
+ tc->snd_nxt = tc->snd_una_max;
+ snd_space = tcp_available_wnd (tc) - tc->snd_rxt_bytes
+ - (tc->snd_una_max - tc->snd_congestion);
+ if (snd_space <= 0 || (tc->snd_una_max - tc->snd_una) >= tc->snd_wnd)
return 0;
-
- /* round down to mss multiple */
- return snd_space - (snd_space % chunk);
+ return tcp_round_snd_space (tc, snd_space);
}
/* If in fast recovery, send 1 SMSS if wnd allows */
- if (tcp_in_fastrecovery (tc) && tcp_available_snd_space (tc)
- && tcp_fastrecovery_sent_1_smss (tc))
+ if (tcp_in_fastrecovery (tc)
+ && tcp_available_snd_space (tc) && !tcp_fastrecovery_sent_1_smss (tc))
{
tcp_fastrecovery_1_smss_on (tc);
return tc->snd_mss;
return 0;
}
+u32
+tcp_session_send_space (transport_connection_t * trans_conn)
+{
+ tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
+ return tcp_snd_space (tc);
+}
+
+i32
+tcp_rcv_wnd_available (tcp_connection_t * tc)
+{
+ return (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
+}
+
u32
tcp_session_tx_fifo_offset (transport_connection_t * trans_conn)
{
Code Review / vpp.git / blobdiff