[PATCH v2 4/5] net: thunderx: Switchon carrier only upon interface link up

[Pavel Fedin]

 Just a reminder, we have issue with this one too, which is not addressed yet.

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia


> -----Original Message-----
> From: netdev-owner at vger.kernel.org [mailto:netdev-owner at vger.kernel.org] On Behalf Of Sunil
> Goutham
> Sent: Wednesday, December 02, 2015 1:06 PM
> To: netdev at vger.kernel.org
> Cc: linux-kernel at vger.kernel.org; linux-arm-kernel at lists.infradead.org;
> Sunil.Goutham at caviumnetworks.com; Sunil Goutham
> Subject: [PATCH v2 4/5] net: thunderx: Switchon carrier only upon interface link up
> 
> From: Sunil Goutham <sgoutham at cavium.com>
> 
> Call netif_carrier_on() only if interface's link is up. Switching this on
> upon IFF_UP by default, is causing issues with ethernet channel bonding
> in LACP mode. Initial NETDEV_CHANGE notification was being skipped.
> 
> Also fixed some issues with link/speed/duplex reporting via ethtool.
> 
> Signed-off-by: Sunil Goutham <sgoutham at cavium.com>
> ---
>  .../net/ethernet/cavium/thunder/nicvf_ethtool.c    |   16 +++++++++++++++-
>  drivers/net/ethernet/cavium/thunder/nicvf_main.c   |    4 +---
>  drivers/net/ethernet/cavium/thunder/thunder_bgx.c  |    2 ++
>  3 files changed, 18 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c
> b/drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c
> index af54c10..a12b2e3 100644
> --- a/drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c
> +++ b/drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c
> @@ -112,6 +112,13 @@ static int nicvf_get_settings(struct net_device *netdev,
> 
>  	cmd->supported = 0;
>  	cmd->transceiver = XCVR_EXTERNAL;
> +
> +	if (!nic->link_up) {
> +		cmd->duplex = DUPLEX_UNKNOWN;
> +		ethtool_cmd_speed_set(cmd, SPEED_UNKNOWN);
> +		return 0;
> +	}
> +
>  	if (nic->speed <= 1000) {
>  		cmd->port = PORT_MII;
>  		cmd->autoneg = AUTONEG_ENABLE;
> @@ -125,6 +132,13 @@ static int nicvf_get_settings(struct net_device *netdev,
>  	return 0;
>  }
> 
> +static u32 nicvf_get_link(struct net_device *netdev)
> +{
> +	struct nicvf *nic = netdev_priv(netdev);
> +
> +	return nic->link_up;
> +}
> +
>  static void nicvf_get_drvinfo(struct net_device *netdev,
>  			      struct ethtool_drvinfo *info)
>  {
> @@ -660,7 +674,7 @@ static int nicvf_set_channels(struct net_device *dev,
> 
>  static const struct ethtool_ops nicvf_ethtool_ops = {
>  	.get_settings		= nicvf_get_settings,
> -	.get_link		= ethtool_op_get_link,
> +	.get_link		= nicvf_get_link,
>  	.get_drvinfo		= nicvf_get_drvinfo,
>  	.get_msglevel		= nicvf_get_msglevel,
>  	.set_msglevel		= nicvf_set_msglevel,
> diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
> b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
> index 7f709cb..dde8dc7 100644
> --- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
> +++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
> @@ -1057,6 +1057,7 @@ int nicvf_stop(struct net_device *netdev)
> 
>  	netif_carrier_off(netdev);
>  	netif_tx_stop_all_queues(nic->netdev);
> +	nic->link_up = false;
> 
>  	/* Teardown secondary qsets first */
>  	if (!nic->sqs_mode) {
> @@ -1211,9 +1212,6 @@ int nicvf_open(struct net_device *netdev)
>  	nic->drv_stats.txq_stop = 0;
>  	nic->drv_stats.txq_wake = 0;
> 
> -	netif_carrier_on(netdev);
> -	netif_tx_start_all_queues(netdev);
> -
>  	return 0;
>  cleanup:
>  	nicvf_disable_intr(nic, NICVF_INTR_MBOX, 0);
> diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
> b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
> index 6534b73..d77e41a 100644
> --- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
> +++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
> @@ -612,6 +612,8 @@ static void bgx_poll_for_link(struct work_struct *work)
>  		lmac->last_duplex = 1;
>  	} else {
>  		lmac->link_up = 0;
> +		lmac->last_speed = SPEED_UNKNOWN;
> +		lmac->last_duplex = DUPLEX_UNKNOWN;
>  	}
> 
>  	if (lmac->last_link != lmac->link_up) {
> --
> 1.7.1
> 
> --
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