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-rw-r--r--src/plugins/unittest/tcp_test.c312
1 files changed, 312 insertions, 0 deletions
diff --git a/src/plugins/unittest/tcp_test.c b/src/plugins/unittest/tcp_test.c
index f919790b031..e604884d107 100644
--- a/src/plugins/unittest/tcp_test.c
+++ b/src/plugins/unittest/tcp_test.c
@@ -780,6 +780,312 @@ tcp_test_session (vlib_main_t * vm, unformat_input_t * input)
return rv;
}
+static inline int
+tbt_seq_lt (u32 a, u32 b)
+{
+ return seq_lt (a, b);
+}
+
+static int
+tcp_test_delivery (vlib_main_t * vm, unformat_input_t * input)
+{
+ u32 thread_index = 0, snd_una, *min_seqs = 0;
+ tcp_rate_sample_t _rs = { 0 }, *rs = &_rs;
+ tcp_connection_t _tc, *tc = &_tc;
+ sack_scoreboard_t *sb = &tc->sack_sb;
+ int __clib_unused verbose = 0, i;
+ u64 rate = 100, burst = 100;
+ sack_block_t *sacks = 0;
+ tcp_byte_tracker_t *bt;
+ rb_node_t *root, *rbn;
+ tcp_bt_sample_t *bts;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "verbose"))
+ verbose = 1;
+ else
+ {
+ vlib_cli_output (vm, "parse error: '%U'", format_unformat_error,
+ input);
+ return -1;
+ }
+ }
+
+ /* Init data structures */
+ memset (tc, 0, sizeof (*tc));
+ session_main.wrk[thread_index].last_vlib_time = 1;
+ transport_connection_tx_pacer_update (&tc->connection, rate);
+
+ tcp_bt_init (tc);
+ bt = tc->bt;
+
+ /*
+ * Track simple bursts without rxt
+ */
+
+ /* 1) track first burst a time 1 */
+ tcp_bt_track_tx (tc);
+
+ TCP_TEST (tcp_bt_is_sane (bt), "tracker should be sane");
+ TCP_TEST (pool_elts (bt->samples) == 1, "should have 1 sample");
+ bts = pool_elt_at_index (bt->samples, bt->head);
+ TCP_TEST (bts->min_seq == tc->snd_una, "min seq should be snd_una");
+ TCP_TEST (bts->next == TCP_BTS_INVALID_INDEX, "next should be invalid");
+ TCP_TEST (bts->prev == TCP_BTS_INVALID_INDEX, "prev should be invalid");
+ TCP_TEST (bts->delivered_time == 1, "delivered time should be 1");
+ TCP_TEST (bts->delivered == 0, "delivered should be 0");
+ TCP_TEST (!(bts->flags & TCP_BTS_IS_RXT), "not retransmitted");
+ TCP_TEST (!(bts->flags & TCP_BTS_IS_APP_LIMITED), "not app limited");
+
+ /* 2) check delivery rate at time 2 */
+ session_main.wrk[thread_index].last_vlib_time = 2;
+ tc->snd_una = tc->snd_nxt = burst;
+ tc->bytes_acked = burst;
+
+ tcp_bt_sample_delivery_rate (tc, rs);
+
+ TCP_TEST (tcp_bt_is_sane (bt), "tracker should be sane");
+ TCP_TEST (pool_elts (bt->samples) == 0, "sample should've been consumed");
+ TCP_TEST (tc->delivered_time == 2, "delivered time should be 2");
+ TCP_TEST (tc->delivered == burst, "delivered should be 100");
+ TCP_TEST (rs->ack_time == 1, "ack time should be 1");
+ TCP_TEST (rs->delivered == burst, "delivered should be 100");
+ TCP_TEST (rs->sample_delivered == 0, "sample delivered should be 0");
+ TCP_TEST (rs->tx_rate == rate, "delivered should be %u", rate);
+ TCP_TEST (!(rs->flags & TCP_BTS_IS_RXT), "not retransmitted");
+
+ /* 3) track second burst at time 2 */
+ tcp_bt_track_tx (tc);
+ tc->snd_nxt += burst;
+
+ /* 4) track second burst at time 3 */
+ session_main.wrk[thread_index].last_vlib_time = 3;
+ tcp_bt_track_tx (tc);
+ tc->snd_nxt += burst;
+
+ TCP_TEST (pool_elts (bt->samples) == 2, "should have 2 samples");
+
+ TCP_TEST (tcp_bt_is_sane (bt), "tracker should be sane");
+ bts = pool_elt_at_index (bt->samples, bt->head);
+ TCP_TEST (bts->min_seq == tc->snd_una, "min seq should be snd_una");
+ TCP_TEST (bts->next == bt->tail, "next should tail");
+
+ bts = pool_elt_at_index (bt->samples, bt->tail);
+ TCP_TEST (bts->min_seq == tc->snd_nxt - burst,
+ "min seq should be snd_nxt prior to burst");
+ TCP_TEST (bts->prev == bt->head, "prev should be head");
+
+ /* 5) check delivery rate at time 4 */
+ session_main.wrk[thread_index].last_vlib_time = 4;
+ tc->snd_una = tc->snd_nxt;
+ tc->bytes_acked = 2 * burst;
+
+ tcp_bt_sample_delivery_rate (tc, rs);
+
+ TCP_TEST (tcp_bt_is_sane (bt), "tracker should be sane");
+ TCP_TEST (pool_elts (bt->samples) == 0, "sample should've been consumed");
+ TCP_TEST (tc->delivered_time == 4, "delivered time should be 4");
+ TCP_TEST (tc->delivered == 3 * burst, "delivered should be 300 is %u",
+ tc->delivered);
+ TCP_TEST (rs->ack_time == 2, "ack time should be 2");
+ TCP_TEST (rs->delivered == 2 * burst, "delivered should be 200");
+ TCP_TEST (rs->sample_delivered == burst, "delivered should be 100");
+ TCP_TEST (rs->tx_rate == rate, "delivered should be %u", rate);
+ TCP_TEST (!(rs->flags & TCP_BTS_IS_RXT), "not retransmitted");
+ TCP_TEST (!(bts->flags & TCP_BTS_IS_APP_LIMITED), "not app limited");
+
+ /*
+ * Track retransmissions
+ *
+ * snd_una should be 300 at this point
+ */
+
+ snd_una = tc->snd_una;
+
+ /* 1) track first burst a time 4 */
+ tcp_bt_track_tx (tc);
+ tc->snd_nxt += burst;
+
+ /* 2) track second burst at time 5 */
+ session_main.wrk[thread_index].last_vlib_time = 5;
+ tcp_bt_track_tx (tc);
+ tc->snd_nxt += burst;
+
+ /* 3) track third burst at time 6 */
+ session_main.wrk[thread_index].last_vlib_time = 6;
+ tcp_bt_track_tx (tc);
+ tc->snd_nxt += burst;
+
+ /* 4) track fourth burst at time 7 */
+ session_main.wrk[thread_index].last_vlib_time = 7;
+ /* Limited until last burst is acked */
+ tc->app_limited = snd_una + 4 * burst - 1;
+ tcp_bt_track_tx (tc);
+ tc->snd_nxt += burst;
+
+ /* 5) check delivery rate at time 8
+ *
+ * tc->snd_una = snd_una + 10
+ * sacks:
+ * [snd_una + burst, snd_una + burst + 10]
+ * [snd_una + 2 * burst + 10, snd_una + 2 * burst + 20]
+ */
+ session_main.wrk[thread_index].last_vlib_time = 8;
+ tc->snd_una += 10;
+ tc->bytes_acked = 10;
+ sb->last_sacked_bytes = 20;
+
+ TCP_TEST (pool_elts (bt->samples) == 4, "there should be 4 samples");
+
+ vec_validate (sacks, 1);
+ sacks[0].start = snd_una + burst;
+ sacks[0].end = snd_una + burst + 10;
+ sacks[1].start = snd_una + 2 * burst + 10;
+ sacks[1].end = snd_una + 2 * burst + 20;
+ tc->rcv_opts.sacks = sacks;
+
+ tcp_bt_sample_delivery_rate (tc, rs);
+
+ TCP_TEST (tcp_bt_is_sane (bt), "tracker should be sane");
+ TCP_TEST (pool_elts (bt->samples) == 4, "there should be 4 samples");
+ TCP_TEST (tc->delivered_time == 8, "delivered time should be 8");
+ TCP_TEST (tc->delivered == 3 * burst + 30, "delivered should be %u is %u",
+ 3 * burst + 30, tc->delivered);
+ /* All 3 samples have the same delivered number of bytes. So the first is
+ * the reference for delivery estimate. */
+ TCP_TEST (rs->ack_time == 4, "ack time should be 4 is %.2f", rs->ack_time);
+ TCP_TEST (rs->delivered == 30, "delivered should be 30");
+ TCP_TEST (rs->sample_delivered == 3 * burst,
+ "sample delivered should be %u", 3 * burst);
+ TCP_TEST (rs->tx_rate == rate, "delivered should be %u", rate);
+ TCP_TEST (!(rs->flags & TCP_BTS_IS_RXT), "not retransmitted");
+ TCP_TEST (!(rs->flags & TCP_BTS_IS_APP_LIMITED), "not app limited");
+
+ /* 6) Retransmit and track at time 9
+ *
+ * delivered = 3 * burst + 30
+ * delivered_time = 8 (last ack)
+ *
+ * segments:
+ * [snd_una + 10, snd_una + burst]
+ * [snd_una + burst + 10, snd_una + 2 * burst + 10]
+ * [snd_una + 2 * burst + 20, snd_una + 4 * burst]
+ */
+ session_main.wrk[thread_index].last_vlib_time = 9;
+
+ tcp_bt_track_rxt (tc, snd_una + 10, snd_una + burst);
+ TCP_TEST (tcp_bt_is_sane (bt), "tracker should be sane");
+ /* The retransmit covers everything left from first burst */
+ TCP_TEST (pool_elts (bt->samples) == 4, "there should be 4 samples");
+
+ tcp_bt_track_rxt (tc, snd_una + burst + 10, snd_una + 2 * burst + 10);
+ TCP_TEST (tcp_bt_is_sane (bt), "tracker should be sane");
+ TCP_TEST (pool_elts (bt->samples) == 5, "there should be 5 samples");
+
+ /* Retransmit covers last sample entirely so it should be removed */
+ tcp_bt_track_rxt (tc, snd_una + 2 * burst + 20, snd_una + 4 * burst);
+ TCP_TEST (tcp_bt_is_sane (bt), "tracker should be sane");
+ TCP_TEST (pool_elts (bt->samples) == 5, "there should be 5 samples");
+
+ vec_validate (min_seqs, 4);
+ min_seqs[0] = snd_una + 10;
+ min_seqs[1] = snd_una + burst;
+ min_seqs[2] = snd_una + burst + 10;
+ min_seqs[3] = snd_una + 2 * burst + 10;
+ min_seqs[4] = snd_una + 2 * burst + 20;
+
+ root = bt->sample_lookup.nodes + bt->sample_lookup.root;
+ bts = bt->samples + bt->head;
+ for (i = 0; i < vec_len (min_seqs); i++)
+ {
+ if (bts->min_seq != min_seqs[i])
+ TCP_TEST (0, "should be %u is %u", min_seqs[i], bts->min_seq);
+ rbn = rb_tree_search_subtree_custom (&bt->sample_lookup, root,
+ bts->min_seq, tbt_seq_lt);
+ if (rbn->opaque != bts - bt->samples)
+ TCP_TEST (0, "lookup should work");
+ bts = bt->samples + bts->next;
+ }
+
+ /* 7) check delivery rate at time 10
+ *
+ * tc->snd_una = snd_una + 2 * burst
+ * sacks:
+ * [snd_una + 2 * burst + 20, snd_una + 2 * burst + 30]
+ * [snd_una + 2 * burst + 50, snd_una + 2 * burst + 60]
+ */
+ session_main.wrk[thread_index].last_vlib_time = 10;
+ tc->snd_una = snd_una + 2 * burst;
+ tc->bytes_acked = 2 * burst - 10;
+ sb->last_sacked_bytes = 20;
+
+ sacks[0].start = snd_una + 2 * burst + 20;
+ sacks[0].end = snd_una + 2 * burst + 30;
+ sacks[1].start = snd_una + 2 * burst + 50;
+ sacks[1].end = snd_una + 2 * burst + 60;
+
+ tcp_bt_sample_delivery_rate (tc, rs);
+
+ TCP_TEST (tcp_bt_is_sane (bt), "tracker should be sane");
+ TCP_TEST (pool_elts (bt->samples) == 3, "num samples should be 3 is %u",
+ pool_elts (bt->samples));
+ TCP_TEST (tc->delivered_time == 10, "delivered time should be 10");
+ TCP_TEST (tc->delivered == 5 * burst + 40, "delivered should be %u is %u",
+ 5 * burst + 40, tc->delivered);
+ /* A rxt was acked and delivered time for it is 8 (last ack time) */
+ TCP_TEST (rs->ack_time == 2, "ack time should be 2 is %.2f", rs->ack_time);
+ /* delivered_now - delivered_rxt ~ 5 * burst + 40 - 3 * burst - 30 */
+ TCP_TEST (rs->delivered == 2 * burst + 10, "delivered should be 210 is %u",
+ rs->delivered);
+ TCP_TEST (rs->sample_delivered == 3 * burst + 30,
+ "sample delivered should be %u", 3 * burst + 30);
+ TCP_TEST (rs->tx_rate == rate, "delivered should be %u", rate);
+ TCP_TEST (rs->flags & TCP_BTS_IS_RXT, "is retransmitted");
+ /* Sample is app limited because of the retransmits */
+ TCP_TEST (rs->flags & TCP_BTS_IS_APP_LIMITED, "is app limited");
+ TCP_TEST (tc->app_limited, "app limited should be set");
+
+ /*
+ * 8) check delivery rate at time 11
+ */
+ session_main.wrk[thread_index].last_vlib_time = 11;
+ tc->snd_una = tc->snd_nxt;
+ tc->bytes_acked = 2 * burst;
+ sb->last_sacked_bytes = 0;
+ sb->last_bytes_delivered = 40;
+
+ memset (rs, 0, sizeof (*rs));
+ tcp_bt_sample_delivery_rate (tc, rs);
+
+ TCP_TEST (tcp_bt_is_sane (bt), "tracker should be sane");
+ TCP_TEST (pool_elts (bt->samples) == 0, "num samples should be 3 is %u",
+ pool_elts (bt->samples));
+ TCP_TEST (tc->delivered_time == 11, "delivered time should be 10");
+ TCP_TEST (tc->delivered == 7 * burst, "delivered should be %u is %u",
+ 7 * burst, tc->delivered);
+ /* Last rxt was at time 8 */
+ TCP_TEST (rs->ack_time == 3, "ack time should be 3 is %.2f", rs->ack_time);
+ /* delivered_now - delivered_rxt ~ 7 * burst - 3 * burst - 30.
+ * That's because we didn't retransmit any new segment. */
+ TCP_TEST (rs->delivered == 4 * burst - 30, "delivered should be 160 is %u",
+ rs->delivered);
+ TCP_TEST (rs->sample_delivered == 3 * burst + 30,
+ "sample delivered should be %u", 3 * burst + 30);
+ TCP_TEST (rs->tx_rate == rate, "delivered should be %u", rate);
+ TCP_TEST (rs->flags & TCP_BTS_IS_RXT, "is retransmitted");
+ TCP_TEST (rs->flags & TCP_BTS_IS_APP_LIMITED, "is app limited");
+ TCP_TEST (tc->app_limited == 0, "app limited should be cleared");
+
+ /*
+ * Cleanup
+ */
+ vec_free (sacks);
+ vec_free (min_seqs);
+ tcp_bt_cleanup (tc);
+ return 0;
+}
+
static clib_error_t *
tcp_test (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd_arg)
@@ -800,12 +1106,18 @@ tcp_test (vlib_main_t * vm,
{
res = tcp_test_lookup (vm, input);
}
+ else if (unformat (input, "delivery"))
+ {
+ res = tcp_test_delivery (vm, input);
+ }
else if (unformat (input, "all"))
{
if ((res = tcp_test_sack (vm, input)))
goto done;
if ((res = tcp_test_lookup (vm, input)))
goto done;
+ if ((res = tcp_test_delivery (vm, input)))
+ goto done;
}
else
break;