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Added unit test case for persist timer / zero window probes

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This commit is contained in:
Simon Goldschmidt
2011-10-10 21:06:50 +02:00
parent f29bdd21a7
commit ce98df59f1
3 changed files with 213 additions and 22 deletions
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160
test/unit/tcp/test_tcp.c
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@@ -7,6 +7,9 @@
#if !LWIP_STATS || !TCP_STATS || !MEMP_STATS
#error "This tests needs TCP- and MEMP-statistics enabled"
#endif
#if TCP_SND_BUF <= TCP_WND
#error "This tests needs TCP_SND_BUF to be > TCP_WND"
#endif
/* Setups/teardown functions */
@@ -265,6 +268,159 @@ START_TEST(test_tcp_fast_retx_recover)
}
END_TEST
static u8_t tx_data[TCP_WND*2];
/** Provoke fast retransmission by duplicate ACKs and then recover by ACKing all sent data.
* At the end, send more data. */
static void test_tcp_tx_full_window_lost(u8_t zero_window_probe_from_unsent)
{
struct netif netif;
struct test_tcp_txcounters txcounters;
struct test_tcp_counters counters;
struct tcp_pcb* pcb;
struct pbuf *p;
ip_addr_t remote_ip, local_ip, netmask;
u16_t remote_port = 0x100, local_port = 0x101;
err_t err;
u16_t sent_total, i;
u8_t expected = 0xFE;
for (i = 0; i < sizeof(tx_data); i++) {
u8_t d = (u8_t)i;
if (d == 0xFE) {
d = 0xF0;
}
tx_data[i] = d;
}
if (zero_window_probe_from_unsent) {
tx_data[TCP_WND] = expected;
} else {
tx_data[0] = expected;
}
/* initialize local vars */
IP4_ADDR(&local_ip, 192, 168, 1, 1);
IP4_ADDR(&remote_ip, 192, 168, 1, 2);
IP4_ADDR(&netmask, 255, 255, 255, 0);
test_tcp_init_netif(&netif, &txcounters, &local_ip, &netmask);
memset(&counters, 0, sizeof(counters));
memset(&txcounters, 0, sizeof(txcounters));
/* create and initialize the pcb */
pcb = test_tcp_new_counters_pcb(&counters);
EXPECT_RET(pcb != NULL);
tcp_set_state(pcb, ESTABLISHED, &local_ip, &remote_ip, local_port, remote_port);
pcb->mss = TCP_MSS;
/* disable initial congestion window (we don't send a SYN here...) */
pcb->cwnd = pcb->snd_wnd;
/* send a full window (minus 1 packets) of TCP data in MSS-sized chunks */
sent_total = 0;
if ((TCP_WND - TCP_MSS) % TCP_MSS != 0) {
u16_t initial_data_len = (TCP_WND - TCP_MSS) % TCP_MSS;
err = tcp_write(pcb, &tx_data[sent_total], initial_data_len, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == initial_data_len + 40U);
memset(&txcounters, 0, sizeof(txcounters));
sent_total += initial_data_len;
}
for (; sent_total < (TCP_WND - TCP_MSS); sent_total += TCP_MSS) {
err = tcp_write(pcb, &tx_data[sent_total], TCP_MSS, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == TCP_MSS + 40U);
memset(&txcounters, 0, sizeof(txcounters));
}
EXPECT(sent_total == (TCP_WND - TCP_MSS));
/* now ACK the packet before the first */
p = tcp_create_rx_segment(pcb, NULL, 0, 0, 0, TCP_ACK);
test_tcp_input(p, &netif);
/* ensure this didn't trigger a retransmission */
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
/* send the last packet, now a complete window has been sent */
err = tcp_write(pcb, &tx_data[sent_total], TCP_MSS, TCP_WRITE_FLAG_COPY);
sent_total += TCP_MSS;
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == TCP_MSS + 40U);
memset(&txcounters, 0, sizeof(txcounters));
if (zero_window_probe_from_unsent) {
/* ACK all data but close the TX window */
p = tcp_create_rx_segment_wnd(pcb, NULL, 0, 0, TCP_WND, TCP_ACK, 0);
test_tcp_input(p, &netif);
/* ensure this didn't trigger any transmission */
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
}
/* send one byte more (out of window) -> persist timer starts */
err = tcp_write(pcb, &tx_data[sent_total], 1, TCP_WRITE_FLAG_COPY);
EXPECT_RET(err == ERR_OK);
err = tcp_output(pcb);
EXPECT_RET(err == ERR_OK);
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
memset(&txcounters, 0, sizeof(txcounters));
/* call tcp_timer some more times to let persist timer count up */
if (zero_window_probe_from_unsent) {
tcp_tmr();
}
for (i = 0; i < 4; i++) {
tcp_tmr();
EXPECT(txcounters.num_tx_calls == 0);
EXPECT(txcounters.num_tx_bytes == 0);
}
/* this should trigger the zero-window-probe */
txcounters.copy_tx_packets = 1;
tcp_tmr();
txcounters.copy_tx_packets = 0;
EXPECT(txcounters.num_tx_calls == 1);
EXPECT(txcounters.num_tx_bytes == 1 + 40U);
EXPECT(txcounters.tx_packets != NULL);
if (txcounters.tx_packets != NULL) {
u8_t sent;
u16_t ret;
ret = pbuf_copy_partial(txcounters.tx_packets, &sent, 1, 40U);
EXPECT(ret == 1);
EXPECT(sent == expected);
}
if (txcounters.tx_packets != NULL) {
pbuf_free(txcounters.tx_packets);
txcounters.tx_packets = NULL;
}
/* make sure the pcb is freed */
EXPECT_RET(lwip_stats.memp[MEMP_TCP_PCB].used == 1);
tcp_abort(pcb);
EXPECT_RET(lwip_stats.memp[MEMP_TCP_PCB].used == 0);
}
START_TEST(test_tcp_tx_full_window_lost_from_unsent)
{
LWIP_UNUSED_ARG(_i);
test_tcp_tx_full_window_lost(1);
}
END_TEST
START_TEST(test_tcp_tx_full_window_lost_from_unacked)
{
LWIP_UNUSED_ARG(_i);
test_tcp_tx_full_window_lost(0);
}
END_TEST
/** Create the suite including all tests for this module */
Suite *
@@ -273,7 +429,9 @@ tcp_suite(void)
TFun tests[] = {
test_tcp_new_abort,
test_tcp_recv_inseq,
test_tcp_fast_retx_recover
test_tcp_fast_retx_recover,
test_tcp_tx_full_window_lost_from_unacked,
test_tcp_tx_full_window_lost_from_unsent
};
return create_suite("TCP", tests, sizeof(tests)/sizeof(TFun), tcp_setup, tcp_teardown);
}