Re: [PATCH v3 1/3] ether: support runtime queue setup

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

> -----Original Message-----
> From: Zhang, Qi Z
> Sent: Wednesday, March 21, 2018 7:28 AM
> To: thomas@monjalon.net; Ananyev, Konstantin <konstantin.ananyev@intel.com>
> Cc: dev@dpdk.org; Xing, Beilei <beilei.xing@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>;
> Zhang, Qi Z <qi.z.zhang@intel.com>
> Subject: [PATCH v3 1/3] ether: support runtime queue setup
> 
> The patch let etherdev driver expose the capability flag through
> rte_eth_dev_info_get when it support runtime queue configuraiton,
> then base on the flag rte_eth_[rx|tx]_queue_setup could decide
> continue to setup the queue or just return fail when device already
> started.
> 
> Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
> ---
> v3:
> - not overload deferred start
> - rename deferred setup to runtime setup
> 
> v2:
> - enhance comment
> 
>  doc/guides/nics/features.rst  |  8 ++++++++
>  lib/librte_ether/rte_ethdev.c | 30 ++++++++++++++++++------------
>  lib/librte_ether/rte_ethdev.h |  7 +++++++
>  3 files changed, 33 insertions(+), 12 deletions(-)
> 
> diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst
> index 1b4fb979f..6983faa4e 100644
> --- a/doc/guides/nics/features.rst
> +++ b/doc/guides/nics/features.rst
> @@ -892,7 +892,15 @@ Documentation describes performance values.
> 
>  See ``dpdk.org/doc/perf/*``.
> 
> +.. _nic_features_queue_runtime_setup_capabilities:
> 
> +Queue runtime setup capabilities
> +---------------------------------
> +
> +Supports queue setup / release after device started.
> +
> +* **[provides] rte_eth_dev_info**:
> ``runtime_queue_config_capa:DEV_RUNTIME_RX_QUEUE_SETUP,DEV_RUNTIME_TX_QUEUE_SETUP``.
> +* **[related]  API**: ``rte_eth_dev_info_get()``.
> 
>  .. _nic_features_other:
> 
> diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
> index 0590f0c10..343b1a6c0 100644
> --- a/lib/librte_ether/rte_ethdev.c
> +++ b/lib/librte_ether/rte_ethdev.c
> @@ -1425,12 +1425,6 @@ rte_eth_rx_queue_setup(uint16_t port_id, uint16_t rx_queue_id,
>  		return -EINVAL;
>  	}
> 
> -	if (dev->data->dev_started) {
> -		RTE_PMD_DEBUG_TRACE(
> -		    "port %d must be stopped to allow configuration\n", port_id);
> -		return -EBUSY;
> -	}
> -
>  	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_infos_get, -ENOTSUP);
>  	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_setup, -ENOTSUP);
> 
> @@ -1474,6 +1468,15 @@ rte_eth_rx_queue_setup(uint16_t port_id, uint16_t rx_queue_id,
>  		return -EINVAL;
>  	}
> 
> +	if (dev->data->dev_started &&
> +		!(dev_info.runtime_queue_setup_capa &
> +			DEV_RUNTIME_RX_QUEUE_SETUP))
> +		return -EBUSY;
> +
> +	if (dev->data->rx_queue_state[rx_queue_id] !=
> +		RTE_ETH_QUEUE_STATE_STOPPED)
> +		return -EBUSY;
> +
>  	rxq = dev->data->rx_queues;
>  	if (rxq[rx_queue_id]) {
>  		RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_release,
> @@ -1573,12 +1576,6 @@ rte_eth_tx_queue_setup(uint16_t port_id, uint16_t tx_queue_id,
>  		return -EINVAL;
>  	}
> 
> -	if (dev->data->dev_started) {
> -		RTE_PMD_DEBUG_TRACE(
> -		    "port %d must be stopped to allow configuration\n", port_id);
> -		return -EBUSY;
> -	}
> -
>  	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_infos_get, -ENOTSUP);
>  	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->tx_queue_setup, -ENOTSUP);
> 
> @@ -1596,6 +1593,15 @@ rte_eth_tx_queue_setup(uint16_t port_id, uint16_t tx_queue_id,
>  		return -EINVAL;
>  	}
> 
> +	if (dev->data->dev_started &&
> +		!(dev_info.runtime_queue_setup_capa &
> +			DEV_RUNTIME_TX_QUEUE_SETUP))
> +		return -EBUSY;
> +
> +	if (dev->data->rx_queue_state[tx_queue_id] !=
> +		RTE_ETH_QUEUE_STATE_STOPPED)
> +		return -EBUSY;
> +
>  	txq = dev->data->tx_queues;
>  	if (txq[tx_queue_id]) {
>  		RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->tx_queue_release,
> diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
> index 036153306..4e2088458 100644
> --- a/lib/librte_ether/rte_ethdev.h
> +++ b/lib/librte_ether/rte_ethdev.h
> @@ -981,6 +981,11 @@ struct rte_eth_conf {
>   */
>  #define DEV_TX_OFFLOAD_SECURITY         0x00020000
> 
> +#define DEV_RUNTIME_RX_QUEUE_SETUP 0x00000001
> +/**< Deferred setup rx queue */
> +#define DEV_RUNTIME_TX_QUEUE_SETUP 0x00000002
> +/**< Deferred setup tx queue */
> +
>  /*
>   * If new Tx offload capabilities are defined, they also must be
>   * mentioned in rte_tx_offload_names in rte_ethdev.c file.
> @@ -1029,6 +1034,8 @@ struct rte_eth_dev_info {
>  	/** Configured number of rx/tx queues */
>  	uint16_t nb_rx_queues; /**< Number of RX queues. */
>  	uint16_t nb_tx_queues; /**< Number of TX queues. */
> +	uint64_t runtime_queue_setup_capa;
> +	/**< queues can be setup after dev_start (DEV_DEFERRED_). */
>  };
> 
>  /**
> --

Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

> 2.13.6