2015-03-23 16:38, Ouyang, Changchun:
> On 3/23/2015 3:20 PM, David Marchand wrote:
> > On Mon, Mar 23, 2015 at 7:56 AM, Ouyang Changchun
> > <changchun.ouyang at intel.com <mailto:changchun.ouyang at intel.com>>
> > wrote:
> >
> > It need clear/reset the stats information before count in all
> > queues data.
> >
> > Signed-off-by: Changchun Ouyang <changchun.ouyang at intel.com
> > <mailto:changchun.ouyang at intel.com>>
> > ---
> > lib/librte_pmd_virtio/virtio_ethdev.c | 8 ++++++++
> > 1 file changed, 8 insertions(+)
> >
> > diff --git a/lib/librte_pmd_virtio/virtio_ethdev.c
> > b/lib/librte_pmd_virtio/virtio_ethdev.c
> > index 603be2d..e4cb55e 100644
> > --- a/lib/librte_pmd_virtio/virtio_ethdev.c
> > +++ b/lib/librte_pmd_virtio/virtio_ethdev.c
> > @@ -572,6 +572,10 @@ virtio_dev_stats_get(struct rte_eth_dev *dev,
> > struct rte_eth_stats *stats)
> > {
> > unsigned i;
> >
> > + stats->opackets = 0;
> > + stats->obytes = 0;
> > + stats->oerrors = 0;
> >
> >
> > stats are supposed to be zero'd in generic rte_ethdev.c before this
> > pmd function is called, so this patch seems useless to me.
> > Can you give some context ?
> >
> > Same comment for the i* part.
> >
> 2 reasons:
> 1. this change could keep the stats_get has consistent behavior with the
> one in other drivers;
If there are some useless reset in other drivers, they should be removed.
> 2. we don't rely on the assumption of caller always zero'd the stats,
> and still can return correct value;
The caller is ethdev and it is zero'ing the structure before the call:
http://dpdk.org/browse/dpdk/commit/?id=02331c16ec0
