[dpdk-dev] [PATCH v2] test/pmd_perf: fix for segmentation fault

[Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>]

Error can be reproduce if we run pmd_perf_autotest with more then
one device in such way:
RTE>>set_rxtx_sc poll_before_xmit
RTE>>pmd_perf_autotest

if first burst was value less than MAX_PKT_BURST in the end we overwrite
pkts_burst table for rx which was supposed for another interface.

Fixes: 002ade70e933 ("app/test: measure cycles per packet in Rx/Tx")
Cc: cunming.liang@intel.com
Cc: stable@dpdk.org

Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>
---
 test/test/test_pmd_perf.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/test/test/test_pmd_perf.c b/test/test/test_pmd_perf.c
index a3e29ed..255f260 100644
--- a/test/test/test_pmd_perf.c
+++ b/test/test/test_pmd_perf.c
@@ -572,6 +572,7 @@ poll_burst(void *args)
 	unsigned i, portid, nb_rx = 0;
 	uint64_t total;
 	uint64_t timeout = MAX_IDLE;
+	int num[RTE_MAX_ETHPORTS];
 
 	lcore_id = rte_lcore_id();
 	conf = &lcore_conf[lcore_id];
@@ -591,6 +592,7 @@ poll_burst(void *args)
 	for (i = 0; i < conf->nb_ports; i++) {
 		portid = conf->portlist[i];
 		next[portid] = i * pkt_per_port;
+		num[portid] = pkt_per_port;
 	}
 
 	while (!rte_atomic64_read(&start))
@@ -601,8 +603,8 @@ poll_burst(void *args)
 		for (i = 0; i < conf->nb_ports; i++) {
 			portid = conf->portlist[i];
 			nb_rx = rte_eth_rx_burst(portid, 0,
-						 &pkts_burst[next[portid]],
-						 MAX_PKT_BURST);
+					&pkts_burst[next[portid]],
+					RTE_MIN(MAX_PKT_BURST, num[portid]));
 			if (unlikely(nb_rx == 0)) {
 				timeout--;
 				if (unlikely(timeout == 0))
@@ -610,6 +612,7 @@ poll_burst(void *args)
 				continue;
 			}
 			next[portid] += nb_rx;
+			num[portid] -= nb_rx;
 			total -= nb_rx;
 		}
 	}
@@ -618,7 +621,6 @@ poll_burst(void *args)
 
 	printf("%"PRIu64" packets lost, IDLE %"PRIu64" times\n",
 	       total, MAX_IDLE - timeout);
-
 	/* clean up */
 	total = pkt_per_port * conf->nb_ports - total;
 	for (i = 0; i < total; i++)
@@ -644,7 +646,7 @@ exec_burst(uint32_t flags, int lcore)
 	conf = &lcore_conf[lcore];
 
 	pkt_per_port = MAX_TRAFFIC_BURST;
-	num = pkt_per_port;
+	num = pkt_per_port * conf->nb_ports;
 
 	rte_atomic64_init(&start);
 
@@ -661,11 +663,12 @@ exec_burst(uint32_t flags, int lcore)
 		nb_tx = RTE_MIN(MAX_PKT_BURST, num);
 		for (i = 0; i < conf->nb_ports; i++) {
 			portid = conf->portlist[i];
-			rte_eth_tx_burst(portid, 0,
+			nb_tx = rte_eth_tx_burst(portid, 0,
 					 &tx_burst[idx], nb_tx);
 			idx += nb_tx;
+			num -= nb_tx;
 		}
-		num -= nb_tx;
+
 	}
 
 	sleep(5);
-- 
2.7.4