Re: [dpdk-dev] [PATCH] test: fix buffer overflow

["Guo, Jia" <jia.guo@intel.com>]

Acked-by: Jeff Guo <jia.guo@intel.com>

> -----Original Message-----
> From: Guo, Jia
> Sent: Friday, January 15, 2021 4:31 PM
> To: 'Zhang,Alvin' <alvinx.zhang@intel.com>; Liang, Cunming
> <cunming.liang@intel.com>
> Cc: dev@dpdk.org; Zhang, AlvinX <alvinx.zhang@intel.com>;
> stable@dpdk.org
> Subject: RE: [dpdk-dev] [PATCH] test: fix buffer overflow
> 
> Hi, Alvin
> 
> > -----Original Message-----
> > From: dev <dev-bounces@dpdk.org> On Behalf Of Zhang,Alvin
> > Sent: Wednesday, November 25, 2020 5:46 PM
> > To: Liang, Cunming <cunming.liang@intel.com>
> > Cc: dev@dpdk.org; Zhang, AlvinX <alvinx.zhang@intel.com>;
> > stable@dpdk.org
> > Subject: [dpdk-dev] [PATCH] test: fix buffer overflow
> >
> > From: Alvin Zhang <alvinx.zhang@intel.com>
> >
> > The Tx buffer may overflow when there is more than one port.
> >
> > Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
> >
> > Fixes: 002ade70e933 ("app/test: measure cycles per packet in Rx/Tx")
> > Cc: stable@dpdk.org
> > ---
> >  app/test/test_pmd_perf.c | 18 ++++++++----------
> >  1 file changed, 8 insertions(+), 10 deletions(-)
> >
> > diff --git a/app/test/test_pmd_perf.c b/app/test/test_pmd_perf.c index
> > 4db816a..3a248d5 100644
> > --- a/app/test/test_pmd_perf.c
> > +++ b/app/test/test_pmd_perf.c
> > @@ -606,10 +606,10 @@ enum {
> >  static int
> >  exec_burst(uint32_t flags, int lcore)  {
> > -	unsigned i, portid, nb_tx = 0;
> > +	unsigned int portid, nb_tx = 0;
> >  	struct lcore_conf *conf;
> >  	uint32_t pkt_per_port;
> > -	int num, idx = 0;
> > +	int num, i, idx = 0;
> >  	int diff_tsc;
> >
> >  	conf = &lcore_conf[lcore];
> > @@ -628,16 +628,14 @@ enum {
> >  		rte_atomic64_set(&start, 1);
> >
> >  	/* start xmit */
> > +	i = 0;
> >  	while (num) {
> >  		nb_tx = RTE_MIN(MAX_PKT_BURST, num);
> > -		for (i = 0; i < conf->nb_ports; i++) {
> > -			portid = conf->portlist[i];
> > -			nb_tx = rte_eth_tx_burst(portid, 0,
> > -					 &tx_burst[idx], nb_tx);
> > -			idx += nb_tx;
> > -			num -= nb_tx;
> > -		}
> > -
> > +		portid = conf->portlist[i];
> > +		nb_tx = rte_eth_tx_burst(portid, 0, &tx_burst[idx], nb_tx);
> > +		idx += nb_tx;
> > +		num -= nb_tx;
> > +		i = (i >= conf->nb_ports - 1) ? 0 : (i + 1);
> 
> If conf->nb_ports = 1, after the above assign, the i should be 1 and is that
> your expected?

Please ignore above comment, this code should be works.

> 
> >  	}
> >
> >  	sleep(5);
> > --
> > 1.8.3.1