Re: [dpdk-dev] [PATCH v2] net/mlx5: fix wrong representor port link status

["Xueming(Steven) Li" <xuemingl@mellanox.com>]

> -----Original Message-----
> From: Yongseok Koh
> Sent: Saturday, September 15, 2018 12:43 AM
> To: Xueming(Steven) Li <xuemingl@mellanox.com>
> Cc: Shahaf Shuler <shahafs@mellanox.com>; dev@dpdk.org; Adrien Mazarguil <adrien.mazarguil@6wind.com>
> Subject: Re: [PATCH v2] net/mlx5: fix wrong representor port link status
> 
> 
> > On Sep 13, 2018, at 11:27 PM, Xueming Li <xuemingl@mellanox.com> wrote:
> >
> > Current code uses PF links status for representor port, not the
> > representor interface itself. This caused wrong representor port link
> > status when toggling linterface up or down.
> >
> > Fixes: 5a4b8e2612c5 ("net/mlx5: probe all port representors")
> 
> Wrong commit SHA.
> Please always check it by running
>         ./devtools/check-git-log.sh -$n
>         ./devtools/checkpatches.sh -n$n
> 
> > Cc: adrien.mazarguil@6wind.com
> >
> > Signed-off-by: Xueming Li <xuemingl@mellanox.com>
> > ---
> > drivers/net/mlx5/mlx5_ethdev.c | 16 ++++++++++------
> > 1 file changed, 10 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/net/mlx5/mlx5_ethdev.c
> > b/drivers/net/mlx5/mlx5_ethdev.c index 34c5b95..7391ab8 100644
> > --- a/drivers/net/mlx5/mlx5_ethdev.c
> > +++ b/drivers/net/mlx5/mlx5_ethdev.c
> > @@ -627,7 +627,7 @@ struct ethtool_link_settings {
> > 	int link_speed = 0;
> > 	int ret;
> >
> > -	ret = mlx5_ifreq(dev, SIOCGIFFLAGS, &ifr, 1);
> > +	ret = mlx5_ifreq(dev, SIOCGIFFLAGS, &ifr, 0);
> > 	if (ret) {
> > 		DRV_LOG(WARNING, "port %u ioctl(SIOCGIFFLAGS) failed: %s",
> > 			dev->data->port_id, strerror(rte_errno)); @@ -636,6 +636,7 @@
> > struct ethtool_link_settings {
> > 	memset(&dev_link, 0, sizeof(dev_link));
> > 	dev_link.link_status = ((ifr.ifr_flags & IFF_UP) &&
> > 				(ifr.ifr_flags & IFF_RUNNING));
> > +	memset(&ifr, 0, sizeof(ifr));
> > 	ifr.ifr_data = (void *)&edata;
> 
> It would be enough to be done like:
> 
> ifr = {
> 	.ifr_data = (void *)&edata,
> };
> 
> And please do the same for dev_link even though it isn't relevant in the patch.
> 
> > 	ret = mlx5_ifreq(dev, SIOCETHTOOL, &ifr, 1);
> > 	if (ret) {
> > @@ -666,8 +667,9 @@ struct ethtool_link_settings {
> > 				ETH_LINK_HALF_DUPLEX : ETH_LINK_FULL_DUPLEX);
> > 	dev_link.link_autoneg = !(dev->data->dev_conf.link_speeds &
> > 			ETH_LINK_SPEED_FIXED);
> > -	if ((dev_link.link_speed && !dev_link.link_status) ||
> > -	    (!dev_link.link_speed && dev_link.link_status)) {
> > +	if (!priv->representor &&
> > +	    ((dev_link.link_speed && !dev_link.link_status) ||
> > +	     (!dev_link.link_speed && dev_link.link_status))) {
> 
> What does this change mean?
> Is it allowed for representors?

Performance the check only if not representor port.
For representor port, the status not consistent here due to speed info retrieved from PF.

> 
> > 		rte_errno = EAGAIN;
> > 		return -rte_errno;
> > 	}
> > @@ -698,7 +700,7 @@ struct ethtool_link_settings {
> > 	uint64_t sc;
> > 	int ret;
> >
> > -	ret = mlx5_ifreq(dev, SIOCGIFFLAGS, &ifr, 1);
> > +	ret = mlx5_ifreq(dev, SIOCGIFFLAGS, &ifr, 0);
> > 	if (ret) {
> > 		DRV_LOG(WARNING, "port %u ioctl(SIOCGIFFLAGS) failed: %s",
> > 			dev->data->port_id, strerror(rte_errno)); @@ -707,6 +709,7 @@
> > struct ethtool_link_settings {
> > 	memset(&dev_link, 0, sizeof(dev_link));
> > 	dev_link.link_status = ((ifr.ifr_flags & IFF_UP) &&
> > 				(ifr.ifr_flags & IFF_RUNNING));
> > +	memset(&ifr, 0, sizeof(ifr));
> 
> Same here for dev_link and ifr.
> 
> Thanks,
> Yongseok
> 
> > 	ifr.ifr_data = (void *)&gcmd;
> > 	ret = mlx5_ifreq(dev, SIOCETHTOOL, &ifr, 1);
> > 	if (ret) {
> > @@ -775,8 +778,9 @@ struct ethtool_link_settings {
> > 				ETH_LINK_HALF_DUPLEX : ETH_LINK_FULL_DUPLEX);
> > 	dev_link.link_autoneg = !(dev->data->dev_conf.link_speeds &
> > 				  ETH_LINK_SPEED_FIXED);
> > -	if ((dev_link.link_speed && !dev_link.link_status) ||
> > -	    (!dev_link.link_speed && dev_link.link_status)) {
> > +	if (!priv->representor &&
> > +	    ((dev_link.link_speed && !dev_link.link_status) ||
> > +	     (!dev_link.link_speed && dev_link.link_status))) {
> > 		rte_errno = EAGAIN;
> > 		return -rte_errno;
> > 	}
> > --
> > 1.8.3.1
> >