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

  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(-)
  

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Daniel Mrzyglod
> Sent: Friday, October 27, 2017 6:24 PM
> To: dev@dpdk.org
> Cc: Mrzyglod, DanielX T <danielx.t.mrzyglod@intel.com>; Liang, Cunming
> <cunming.liang@intel.com>; stable@dpdk.org
> Subject: [dpdk-dev] [PATCH v2] test/pmd_perf: fix for segmentation fault
> 
> 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

Acked-by: Michal Jastrzebski <michalx.k.jastrzebski@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>
> 
> Acked-by: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>

Applied, thanks