Re: [RFC 11/14] liquidio: use _rte_eth_link_update

[Shijith Thotton <shijith.thotton@caviumnetworks.com>]

On Fri, Jul 14, 2017 at 11:30:24AM -0700, Stephen Hemminger wrote:
> Use the new link update API, and cleanup the logic in the the
> link update routine.
> 
> Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
> ---
>  drivers/net/liquidio/lio_ethdev.c | 76 ++++++++++-----------------------------
>  1 file changed, 19 insertions(+), 57 deletions(-)
> 
> diff --git a/drivers/net/liquidio/lio_ethdev.c b/drivers/net/liquidio/lio_ethdev.c
> index 479936a52ff9..95dc7232601e 100644
> --- a/drivers/net/liquidio/lio_ethdev.c
> +++ b/drivers/net/liquidio/lio_ethdev.c
> @@ -888,32 +888,6 @@ lio_dev_vlan_filter_set(struct rte_eth_dev *eth_dev, uint16_t vlan_id, int on)
>  	return 0;
>  }
>  
> -/**
> - * Atomically writes the link status information into global
> - * structure rte_eth_dev.
> - *
> - * @param eth_dev
> - *   - Pointer to the structure rte_eth_dev to read from.
> - *   - Pointer to the buffer to be saved with the link status.
> - *
> - * @return
> - *   - On success, zero.
> - *   - On failure, negative value.
> - */
> -static inline int
> -lio_dev_atomic_write_link_status(struct rte_eth_dev *eth_dev,
> -				 struct rte_eth_link *link)
> -{
> -	struct rte_eth_link *dst = &eth_dev->data->dev_link;
> -	struct rte_eth_link *src = link;
> -
> -	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
> -				*(uint64_t *)src) == 0)
> -		return -1;
> -
> -	return 0;
> -}
> -
>  static uint64_t
>  lio_hweight64(uint64_t w)
>  {
> @@ -933,45 +907,33 @@ lio_dev_link_update(struct rte_eth_dev *eth_dev,
>  		    int wait_to_complete __rte_unused)
>  {
>  	struct lio_device *lio_dev = LIO_DEV(eth_dev);
> -	struct rte_eth_link link, old;
> +	struct rte_eth_link link;
>  
>  	/* Initialize */
> -	link.link_status = ETH_LINK_DOWN;
> -	link.link_speed = ETH_SPEED_NUM_NONE;
> -	link.link_duplex = ETH_LINK_HALF_DUPLEX;
> -	memset(&old, 0, sizeof(old));
> -
> +	memset(&link, 0, sizeof(link));
>  	/* Return what we found */
>  	if (lio_dev->linfo.link.s.link_up == 0) {
> -		/* Interface is down */
> -		if (lio_dev_atomic_write_link_status(eth_dev, &link))
> -			return -1;
> -		if (link.link_status == old.link_status)
> -			return -1;
> -		return 0;
> -	}
> -
> -	link.link_status = ETH_LINK_UP; /* Interface is up */
> -	link.link_duplex = ETH_LINK_FULL_DUPLEX;
> -	switch (lio_dev->linfo.link.s.speed) {
> -	case LIO_LINK_SPEED_10000:
> -		link.link_speed = ETH_SPEED_NUM_10G;
> -		break;
> -	case LIO_LINK_SPEED_25000:
> -		link.link_speed = ETH_SPEED_NUM_25G;
> -		break;
> -	default:
> +		link.link_status = ETH_LINK_DOWN;
>  		link.link_speed = ETH_SPEED_NUM_NONE;
>  		link.link_duplex = ETH_LINK_HALF_DUPLEX;
> -	}
> -
> -	if (lio_dev_atomic_write_link_status(eth_dev, &link))
> -		return -1;
> +	} else {
> +		link.link_status = ETH_LINK_UP; /* Interface is up */
> +		link.link_duplex = ETH_LINK_FULL_DUPLEX;
> +		switch (lio_dev->linfo.link.s.speed) {
> +		case LIO_LINK_SPEED_10000:
> +			link.link_speed = ETH_SPEED_NUM_10G;
> +			break;
> +		case LIO_LINK_SPEED_25000:
> +			link.link_speed = ETH_SPEED_NUM_25G;
> +			break;
> +		default:
> +			link.link_speed = ETH_SPEED_NUM_NONE;
> +			link.link_duplex = ETH_LINK_HALF_DUPLEX;
> +		}
>  
> -	if (link.link_status == old.link_status)
> -		return -1;
> +	}
>  
> -	return 0;
> +	return _rte_eth_link_update(eth_dev, &link);
>  }
>  
>  /**
> -- 
> 2.11.0
> 

Tested-by: Shijith Thotton <shijith.thotton@caviumnetworks.com>

Thanks,
Shijith