[PATCH 1/1] test/pmd_perf: handling of unknown connection speed

[Heinrich Schuchardt <heinrich.schuchardt@canonical.com>]

When running DPDK in QEMU it cannot determine the connection speed.
pmd_perf_autotest treats this as if the connection speed where
UNIT32_MAX Mbps:

    RTE>>pmd_perf_autotest
    Start PMD RXTX cycles cost test.
    Allocated mbuf pool on socket 0
    CONFIG RXD=1024 TXD=1024
    Performance test runs on lcore 1 socket 0
    Port 0 Address:52:54:00:12:34:57
    Port 1 Address:52:54:00:12:34:58
    Checking link statuses...
    Port 0 Link up at Unknown FDX Autoneg
    Port 1 Link up at Unknown FDX Autoneg
    IPv4 pktlen 46
    UDP pktlen 26
    Generate 4096 packets @socket 0
    inject 2048 packet to port 0
    inject 2048 packet to port 1
    Total packets inject to prime ports = 4096
    Each port will do 6391320379464 packets per second
    Test will stop after at least 25565281517856 packets received

This will not allow the test to terminate in a reasonable timespan.
Just assume 10 Gbps in this case instead:

    ...
    Test will stop after at least 59523808 packets received

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
---
 app/test/test_pmd_perf.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/app/test/test_pmd_perf.c b/app/test/test_pmd_perf.c
index 25611bfe9b..ee08c8aade 100644
--- a/app/test/test_pmd_perf.c
+++ b/app/test/test_pmd_perf.c
@@ -486,10 +486,17 @@ main_loop(__rte_unused void *args)
 	}
 	printf("Total packets inject to prime ports = %u\n", idx);
 
-	packets_per_second = (link_mbps * 1000 * 1000) /
-		((PACKET_SIZE + FRAME_GAP + MAC_PREAMBLE) * CHAR_BIT);
-	printf("Each port will do %"PRIu64" packets per second\n",
-	       packets_per_second);
+	if (link_mbps != RTE_ETH_SPEED_NUM_UNKNOWN) {
+		packets_per_second = (link_mbps * 1000 * 1000) /
+			((PACKET_SIZE + FRAME_GAP + MAC_PREAMBLE) * CHAR_BIT);
+		printf("Each port will do %"PRIu64" packets per second\n",
+		       packets_per_second);
+		total_packets = RTE_TEST_DURATION * conf->nb_ports * packets_per_second;
+	} else {
+		/* We don't know the speed. Pretend it is 10G */
+		packets_per_second = ((uint64_t)RTE_ETH_SPEED_NUM_10G * 1000 * 1000) /
+			((PACKET_SIZE + FRAME_GAP + MAC_PREAMBLE) * CHAR_BIT);
+	}
 
 	total_packets = RTE_TEST_DURATION * conf->nb_ports * packets_per_second;
 	printf("Test will stop after at least %"PRIu64" packets received\n",
-- 
2.34.1