Re: [dpdk-dev] [PATCH V5] ethdev: add queue state when retrieve queue information

["Kinsella, Ray" <mdr@ashroe.eu>]

On 17/04/2021 04:09, Lijun Ou wrote:
> Currently, upper-layer application could get queue state only
> through pointers such as dev->data->tx_queue_state[queue_id],
> this is not the recommended way to access it. So this patch
> add get queue state when call rte_eth_rx_queue_info_get and
> rte_eth_tx_queue_info_get API.
> 
> Note: After add queue_state field, the 'struct rte_eth_rxq_info' size
> remains 128B, and the 'struct rte_eth_txq_info' size remains 64B, so
> it could be ABI compatible.
> 
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> Signed-off-by: Lijun Ou <oulijun@huawei.com>
> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> ---
> V4->V5:
> - Add acked-by
> - add a note to the "New features" section to annouce the new feature.
> 
> V3->V4:
> - update libabigail.abignore for removing the CI warnings
> 
> V2->V3:
> - rewrite the commit log and delete the part Note
> - rewrite tht comments for queue state
> - move the queue_state definition locations
> 
> V1->V2:
> - move queue state defines to public file
> ---
>  doc/guides/rel_notes/release_21_05.rst | 6 ++++++
>  lib/librte_ethdev/ethdev_driver.h      | 7 -------
>  lib/librte_ethdev/rte_ethdev.c         | 3 +++
>  lib/librte_ethdev/rte_ethdev.h         | 9 +++++++++
>  4 files changed, 18 insertions(+), 7 deletions(-)
> 
> diff --git a/doc/guides/rel_notes/release_21_05.rst b/doc/guides/rel_notes/release_21_05.rst
> index 58272e1..1ab3681 100644
> --- a/doc/guides/rel_notes/release_21_05.rst
> +++ b/doc/guides/rel_notes/release_21_05.rst
> @@ -81,6 +81,12 @@ New Features
>        representor=[[c#]pf#]sf# sf[0,2-1023] /* 1023 SFs.                     */
>        representor=[c#]pf#      c2pf[0,1]    /* 2 PFs on controller 2.        */
>  
> +* **Enhanced function for getting rxq/txq info ABI.**
> +  * Added new field ``queue_state`` to ``rte_eth_rxq_info`` structure to
> +    provide indicated rxq queue state.
> +  * Added new field ``queue_state`` to ``rte_eth_txq_info`` structure to
> +    provide indicated txq queue state.
> +
>  * **Added support for meter PPS profile.**
>  
>    Currently meter algorithms only supports bytes per second(BPS).
> diff --git a/lib/librte_ethdev/ethdev_driver.h b/lib/librte_ethdev/ethdev_driver.h
> index 113129d..40e474a 100644
> --- a/lib/librte_ethdev/ethdev_driver.h
> +++ b/lib/librte_ethdev/ethdev_driver.h
> @@ -952,13 +952,6 @@ struct eth_dev_ops {
>  };
>  
>  /**
> - * RX/TX queue states
> - */
> -#define RTE_ETH_QUEUE_STATE_STOPPED 0
> -#define RTE_ETH_QUEUE_STATE_STARTED 1
> -#define RTE_ETH_QUEUE_STATE_HAIRPIN 2
> -
> -/**
>   * @internal
>   * Check if the selected Rx queue is hairpin queue.
>   *
> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
> index c73d263..d5adf4f 100644
> --- a/lib/librte_ethdev/rte_ethdev.c
> +++ b/lib/librte_ethdev/rte_ethdev.c
> @@ -5038,6 +5038,8 @@ rte_eth_rx_queue_info_get(uint16_t port_id, uint16_t queue_id,
>  
>  	memset(qinfo, 0, sizeof(*qinfo));
>  	dev->dev_ops->rxq_info_get(dev, queue_id, qinfo);
> +	qinfo->queue_state = dev->data->rx_queue_state[queue_id];
> +
>  	return 0;
>  }
>  
> @@ -5078,6 +5080,7 @@ rte_eth_tx_queue_info_get(uint16_t port_id, uint16_t queue_id,
>  
>  	memset(qinfo, 0, sizeof(*qinfo));
>  	dev->dev_ops->txq_info_get(dev, queue_id, qinfo);
> +	qinfo->queue_state = dev->data->tx_queue_state[queue_id];
>  
>  	return 0;
>  }
> diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
> index 3b773b6..a0d01d2 100644
> --- a/lib/librte_ethdev/rte_ethdev.h
> +++ b/lib/librte_ethdev/rte_ethdev.h
> @@ -1588,6 +1588,13 @@ struct rte_eth_dev_info {
>  };
>  
>  /**
> + * RX/TX queue states
> + */
> +#define RTE_ETH_QUEUE_STATE_STOPPED 0
> +#define RTE_ETH_QUEUE_STATE_STARTED 1
> +#define RTE_ETH_QUEUE_STATE_HAIRPIN 2
> +
> +/**
>   * Ethernet device RX queue information structure.
>   * Used to retrieve information about configured queue.
>   */
> @@ -1595,6 +1602,7 @@ struct rte_eth_rxq_info {
>  	struct rte_mempool *mp;     /**< mempool used by that queue. */
>  	struct rte_eth_rxconf conf; /**< queue config parameters. */
>  	uint8_t scattered_rx;       /**< scattered packets RX supported. */
> +	uint8_t queue_state;        /**< one of RTE_ETH_QUEUE_STATE_*. */

Are we sure this is a false positive? - it is being added mid-structure on the rx-side at least.
Shouldn't this be appended to the end - unless it is being sneaked into padding between fields. 

>  	uint16_t nb_desc;           /**< configured number of RXDs. */
>  	uint16_t rx_buf_size;       /**< hardware receive buffer size. */
>  } __rte_cache_min_aligned;
> @@ -1606,6 +1614,7 @@ struct rte_eth_rxq_info {
>  struct rte_eth_txq_info {
>  	struct rte_eth_txconf conf; /**< queue config parameters. */
>  	uint16_t nb_desc;           /**< configured number of TXDs. */
> +	uint8_t queue_state;        /**< one of RTE_ETH_QUEUE_STATE_*. */
>  } __rte_cache_min_aligned;
>  
>  /* Generic Burst mode flag definition, values can be ORed. */
>