Re: [dpdk-dev] [PATCH v1 1/5] ethdev: add rx interrupt enable/disable functions

["Qiu, Michael" <michael.qiu@intel.com>]

On 1/28/2015 5:51 PM, Danny Zhou wrote:

Commit log is better for others to review the patch I think, it's
helpful for others to understand your patch.
 
> Signed-off-by: Danny Zhou <danny.zhou@intel.com>
> ---
>  lib/librte_ether/rte_ethdev.c | 45 ++++++++++++++++++++++++++++++++++
>  lib/librte_ether/rte_ethdev.h | 57 +++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 102 insertions(+)
>
> diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
> index ea3a1fb..dd66cd9 100644
> --- a/lib/librte_ether/rte_ethdev.c
> +++ b/lib/librte_ether/rte_ethdev.c
> @@ -2825,6 +2825,51 @@ _rte_eth_dev_callback_process(struct rte_eth_dev *dev,
>  	}
>  	rte_spinlock_unlock(&rte_eth_dev_cb_lock);
>  }
> +
> +int
> +rte_eth_dev_rx_queue_intr_enable(uint8_t port_id,
> +				uint16_t queue_id)
> +{
> +	struct rte_eth_dev *dev;
> +
> +	if (port_id >= nb_ports) {
> +		PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
> +		return (-ENODEV);
> +	}
> +
> +	dev = &rte_eth_devices[port_id];
> +	if (dev == NULL) {
> +		PMD_DEBUG_TRACE("Invalid port device\n");
> +		return (-ENODEV);
> +	}
> +
> +	FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_intr_enable, -ENOTSUP);
> +	(*dev->dev_ops->rx_queue_intr_enable)(dev, queue_id);

As callback function rx_queue_intr_enabl() has a return value, I think
it better to do a check, although all your implement always return a
value of zero.

BTW, better to add a blank line before last return.

Thanks,
Michael
> +	return 0;
> +}
> +
> +int
> +rte_eth_dev_rx_queue_intr_disable(uint8_t port_id,
> +				uint16_t queue_id)
> +{
> +	struct rte_eth_dev *dev;
> +
> +	if (port_id >= nb_ports) {
> +		PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
> +		return (-ENODEV);
> +	}
> +
> +	dev = &rte_eth_devices[port_id];
> +	if (dev == NULL) {
> +		PMD_DEBUG_TRACE("Invalid port device\n");
> +		return (-ENODEV);
> +	}
> +
> +	FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_intr_disable, -ENOTSUP);
> +	(*dev->dev_ops->rx_queue_intr_disable)(dev, queue_id);
> +	return 0;
> +}
> +
>  #ifdef RTE_NIC_BYPASS
>  int rte_eth_dev_bypass_init(uint8_t port_id)
>  {
> diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
> index 1200c1c..c080039 100644
> --- a/lib/librte_ether/rte_ethdev.h
> +++ b/lib/librte_ether/rte_ethdev.h
> @@ -848,6 +848,8 @@ struct rte_eth_fdir {
>  struct rte_intr_conf {
>  	/** enable/disable lsc interrupt. 0 (default) - disable, 1 enable */
>  	uint16_t lsc;
> +	/** enable/disable rxq interrupt. 0 (default) - disable, 1 enable */
> +	uint16_t rxq;
>  };
>  
>  /**
> @@ -1108,6 +1110,14 @@ typedef int (*eth_tx_queue_setup_t)(struct rte_eth_dev *dev,
>  				    const struct rte_eth_txconf *tx_conf);
>  /**< @internal Setup a transmit queue of an Ethernet device. */
>  
> +typedef int (*eth_rx_enable_intr_t)(struct rte_eth_dev *dev,
> +				    uint16_t rx_queue_id);
> +/**< @internal Enable interrupt of a receive queue of an Ethernet device. */
> +
> +typedef int (*eth_rx_disable_intr_t)(struct rte_eth_dev *dev,
> +				    uint16_t rx_queue_id);
> +/**< @internal Disable interrupt of a receive queue of an Ethernet device. */
> +
>  typedef void (*eth_queue_release_t)(void *queue);
>  /**< @internal Release memory resources allocated by given RX/TX queue. */
>  
> @@ -1444,6 +1454,8 @@ struct eth_dev_ops {
>  	eth_queue_start_t          tx_queue_start;/**< Start TX for a queue.*/
>  	eth_queue_stop_t           tx_queue_stop;/**< Stop TX for a queue.*/
>  	eth_rx_queue_setup_t       rx_queue_setup;/**< Set up device RX queue.*/
> +	eth_rx_enable_intr_t       rx_queue_intr_enable; /**< Enable Rx queue interrupt. */
> +	eth_rx_disable_intr_t      rx_queue_intr_disable; /**< Disable Rx queue interrupt.*/
>  	eth_queue_release_t        rx_queue_release;/**< Release RX queue.*/
>  	eth_rx_queue_count_t       rx_queue_count; /**< Get Rx queue count. */
>  	eth_rx_descriptor_done_t   rx_descriptor_done;  /**< Check rxd DD bit */
> @@ -2810,6 +2822,51 @@ void _rte_eth_dev_callback_process(struct rte_eth_dev *dev,
>  				enum rte_eth_event_type event);
>  
>  /**
> + * When there is no rx packet coming in Rx Queue for a long time, we can
> + * sleep lcore related to RX Queue for power saving, and enable rx interrupt
> + * to be triggered when rx packect arrives.
> + *
> + * The rte_eth_dev_rx_queue_intr_enable() function enables rx queue
> + * interrupt on specific rx queue of a port.
> + *
> + * @param port_id
> + *   The port identifier of the Ethernet device.
> + * @param queue_id
> + *   The index of the receive queue from which to retrieve input packets.
> + *   The value must be in the range [0, nb_rx_queue - 1] previously supplied
> + *   to rte_eth_dev_configure().
> + * @return
> + *   - (0) if successful.
> + *   - (-ENOTSUP) if underlying hardware OR driver doesn't support
> + *     that operation.
> + *   - (-ENODEV) if *port_id* invalid.
> + */
> +int rte_eth_dev_rx_queue_intr_enable(uint8_t port_id,
> +				uint16_t queue_id);
> +
> +/**
> + * When lcore wakes up from rx interrupt indicating packet coming, disable rx
> + * interrupt and returns to polling mode.
> + *
> + * The rte_eth_dev_rx_queue_intr_disable() function disables rx queue
> + * interrupt on specific rx queue of a port.
> + *
> + * @param port_id
> + *   The port identifier of the Ethernet device.
> + * @param queue_id
> + *   The index of the receive queue from which to retrieve input packets.
> + *   The value must be in the range [0, nb_rx_queue - 1] previously supplied
> + *   to rte_eth_dev_configure().
> + * @return
> + *   - (0) if successful.
> + *   - (-ENOTSUP) if underlying hardware OR driver doesn't support
> + *     that operation.
> + *   - (-ENODEV) if *port_id* invalid.
> + */
> +int rte_eth_dev_rx_queue_intr_disable(uint8_t port_id,
> +				uint16_t queue_id);
> +
> +/**
>   * Turn on the LED on the Ethernet device.
>   * This function turns on the LED on the Ethernet device.
>   *