Re: [PATCH v2] net/mlx5: fix link status query

["Nélio Laranjeiro" <nelio.laranjeiro@6wind.com>]

On Tue, Jan 31, 2017 at 01:45:29PM +0200, Shahaf Shuler wrote:
> Trying to query the link status through new kernel ioctl API
> ETHTOOL_GLINKSETTINGS was always failing due to kernel bug.
> The bug was fixed on version 4.9
> this patch uses the legacy ioctl API for lower kernels.
> 
> Fixes: 188408719888 ("net/mlx5: fix support for newer link speeds")
> CC: stable@dpdk.org
> 
> Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
> ---
> on v2:
> * remove HAVE_ETHTOOL_LINK_MODE_*
> 
> ---
>  drivers/net/mlx5/Makefile      | 15 ---------------
>  drivers/net/mlx5/mlx5_ethdev.c | 12 +++---------
>  2 files changed, 3 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/net/mlx5/Makefile b/drivers/net/mlx5/Makefile
> index 671089c..0b8f7ba 100644
> --- a/drivers/net/mlx5/Makefile
> +++ b/drivers/net/mlx5/Makefile
> @@ -122,21 +122,6 @@ mlx5_autoconf.h.new: $(RTE_SDK)/buildtools/auto-config-h.sh
>  		infiniband/mlx5_hw.h \
>  		enum MLX5_OPCODE_TSO \
>  		$(AUTOCONF_OUTPUT)
> -	$Q sh -- '$<' '$@' \
> -		HAVE_ETHTOOL_LINK_MODE_25G \
> -		/usr/include/linux/ethtool.h \
> -		enum ETHTOOL_LINK_MODE_25000baseCR_Full_BIT \
> -		$(AUTOCONF_OUTPUT)
> -	$Q sh -- '$<' '$@' \
> -		HAVE_ETHTOOL_LINK_MODE_50G \
> -		/usr/include/linux/ethtool.h \
> -		enum ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT \
> -		$(AUTOCONF_OUTPUT)
> -	$Q sh -- '$<' '$@' \
> -		HAVE_ETHTOOL_LINK_MODE_100G \
> -		/usr/include/linux/ethtool.h \
> -		enum ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT \
> -		$(AUTOCONF_OUTPUT)
>  
>  # Create mlx5_autoconf.h or update it in case it differs from the new one.
>  
> diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
> index 8efdff7..53599fa 100644
> --- a/drivers/net/mlx5/mlx5_ethdev.c
> +++ b/drivers/net/mlx5/mlx5_ethdev.c
> @@ -46,6 +46,7 @@
>  #include <netinet/in.h>
>  #include <linux/ethtool.h>
>  #include <linux/sockios.h>
> +#include <linux/version.h>
>  #include <fcntl.h>
>  
>  /* DPDK headers don't like -pedantic. */
> @@ -697,7 +698,7 @@ struct priv *
>  
>  /**
>   * Retrieve physical link information (unlocked version using new ioctl from
> - * Linux 4.5).
> + * Linux 4.9).
>   *
>   * @param dev
>   *   Pointer to Ethernet device structure.
> @@ -707,7 +708,7 @@ struct priv *
>  static int
>  mlx5_link_update_unlocked_gs(struct rte_eth_dev *dev, int wait_to_complete)
>  {
> -#ifdef ETHTOOL_GLINKSETTINGS
> +#if KERNEL_VERSION(4, 9, 0) <= LINUX_VERSION_CODE
>  	struct priv *priv = mlx5_get_priv(dev);
>  	struct ethtool_link_settings edata = {
>  		.cmd = ETHTOOL_GLINKSETTINGS,
> @@ -757,25 +758,18 @@ struct priv *
>  		  ETHTOOL_LINK_MODE_56000baseSR4_Full_BIT |
>  		  ETHTOOL_LINK_MODE_56000baseLR4_Full_BIT))
>  		priv->link_speed_capa |= ETH_LINK_SPEED_56G;
> -	/* Link speeds available in kernel v4.6. */
> -#ifdef HAVE_ETHTOOL_LINK_MODE_25G
>  	if (sc & (ETHTOOL_LINK_MODE_25000baseCR_Full_BIT |
>  		  ETHTOOL_LINK_MODE_25000baseKR_Full_BIT |
>  		  ETHTOOL_LINK_MODE_25000baseSR_Full_BIT))
>  		priv->link_speed_capa |= ETH_LINK_SPEED_25G;
> -#endif
> -#ifdef HAVE_ETHTOOL_LINK_MODE_50G
>  	if (sc & (ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT |
>  		  ETHTOOL_LINK_MODE_50000baseKR2_Full_BIT))
>  		priv->link_speed_capa |= ETH_LINK_SPEED_50G;
> -#endif
> -#ifdef HAVE_ETHTOOL_LINK_MODE_100G
>  	if (sc & (ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT |
>  		  ETHTOOL_LINK_MODE_100000baseSR4_Full_BIT |
>  		  ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT |
>  		  ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT))
>  		priv->link_speed_capa |= ETH_LINK_SPEED_100G;
> -#endif
>  	dev_link.link_duplex = ((edata.duplex == DUPLEX_HALF) ?
>  				ETH_LINK_HALF_DUPLEX : ETH_LINK_FULL_DUPLEX);
>  	dev_link.link_autoneg = !(dev->data->dev_conf.link_speeds &
> -- 
> 1.8.3.1

Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

-- 
Nélio Laranjeiro
6WIND