Re: [dpdk-dev] [PATCH v3 1/5] ethdev: add rx interrupt enable/disable functions

["Zhou, Danny" <danny.zhou@intel.com>]

> -----Original Message-----
> From: Gonzalez Monroy, Sergio
> Sent: Thursday, February 19, 2015 4:22 PM
> To: Zhou, Danny; Neil Horman
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v3 1/5] ethdev: add rx interrupt enable/disable functions
> 
> On 19/02/2015 08:06, Zhou, Danny wrote:
> >
> >> -----Original Message-----
> >> From: Neil Horman [mailto:nhorman@tuxdriver.com]
> >> Sent: Tuesday, February 17, 2015 11:53 PM
> >> To: Zhou, Danny
> >> Cc: dev@dpdk.org
> >> Subject: Re: [dpdk-dev] [PATCH v3 1/5] ethdev: add rx interrupt enable/disable functions
> >>
> >> On Tue, Feb 17, 2015 at 09:47:15PM +0800, Zhou Danny wrote:
> >>> v3 changes
> >>> - Add return value for interrupt enable/disable functions
> >>>
> >>> Add two dev_ops functions to enable and disable rx queue interrupts
> >>>
> >>> Signed-off-by: Danny Zhou <danny.zhou@intel.com>
> >>> Tested-by: Yong Liu <yong.liu@intel.com>
> >>> ---
> >>>   lib/librte_ether/rte_ethdev.c | 43 ++++++++++++++++++++++++++++++++
> >>>   lib/librte_ether/rte_ethdev.h | 57 +++++++++++++++++++++++++++++++++++++++++++
> >>>   2 files changed, 100 insertions(+)
> >>>
> >>> diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
> >>> index ea3a1fb..d27469a 100644
> >>> --- a/lib/librte_ether/rte_ethdev.c
> >>> +++ b/lib/librte_ether/rte_ethdev.c
> >>> @@ -2825,6 +2825,49 @@ _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);
> >>> +	return (*dev->dev_ops->rx_queue_intr_enable)(dev, queue_id);
> >>> +}
> >>> +
> >>> +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);
> >>> +	return (*dev->dev_ops->rx_queue_intr_disable)(dev, queue_id);
> >>> +}
> >>> +
> >>>   #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 84160c3..0f320a9 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;
> >>>   };
> >>>
> >>>   /**
> >>> @@ -1109,6 +1111,14 @@ 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. */
> >>>
> >>> @@ -1445,6 +1455,8 @@ 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 */
> >>> @@ -2811,6 +2823,51 @@ 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.
> >>>    *
> >>> --
> >>> 1.8.1.4
> >>>
> >>>
> >> Need to export these functions
> >> Neil
> > Sorry, I do not get it. What do you mean export these functions? They have been
> > declared in rte_ethdev.h and defined here in rte_ethdev.c. And caller in
> > L3fwd-power example is able to link those two functions in the library.
> Hi Danny,
> 
> I think what he meant is that you need to add them to the version map
> file so they are accessible when building shared libraries.
> 
> Sergio

Thanks Sergio for pointing this out, I will add them to the version map file in V4 patch.