[PATCH] lib: add get/set link settings interface

[Tyler Retzlaff]

On Wed, Apr 03, 2024 at 06:40:24AM -0700, Marek Pazdan wrote:
>  There are link settings parameters available from PMD drivers level
>  which are currently not exposed to the user via consistent interface.
>  When interface is available for system level those information can
>  be acquired with 'ethtool DEVNAME' (ioctl: ETHTOOL_SLINKSETTINGS/
>  ETHTOOL_GLINKSETTINGS). There are use cases where
>  physical interface is passthrough to dpdk driver and is not available
>  from system level. Information provided by ioctl carries information
>  useful for link auto negotiation settings among others.
> 
> Signed-off-by: Marek Pazdan <mpazdan at arista.com>
> ---
> diff --git a/lib/ethdev/rte_ethdev.h b/lib/ethdev/rte_ethdev.h
> index 147257d6a2..66aad925d0 100644
> --- a/lib/ethdev/rte_ethdev.h
> +++ b/lib/ethdev/rte_ethdev.h
> @@ -335,7 +335,7 @@ struct rte_eth_stats {
>  __extension__
>  struct __rte_aligned(8) rte_eth_link { /**< aligned for atomic64 read/write */
>  	uint32_t link_speed;        /**< RTE_ETH_SPEED_NUM_ */
> -	uint16_t link_duplex  : 1;  /**< RTE_ETH_LINK_[HALF/FULL]_DUPLEX */
> +	uint16_t link_duplex  : 2;  /**< RTE_ETH_LINK_[HALF/FULL/UNKNOWN]_DUPLEX */
>  	uint16_t link_autoneg : 1;  /**< RTE_ETH_LINK_[AUTONEG/FIXED] */
>  	uint16_t link_status  : 1;  /**< RTE_ETH_LINK_[DOWN/UP] */
>  };

this breaks the abi. David does libabigail pick this up i wonder?