Re: [dpdk-dev] [PATCH v2 1/3] ethdev: new API to free consumed buffers in Tx ring

[Stephen Hemminger <stephen@networkplumber.org>]

On Wed, 11 Jan 2017 15:03:21 -0500
Billy McFall <bmcfall@redhat.com> wrote:

>  /**
> + * Request the driver to free mbufs currently cached by the driver. The
> + * driver will only free the mbuf if it is no longer in use. It is the
> + * application's responsibity to ensure rte_eth_tx_buffer_flush(..) is
> + * called if needed.
> + *
> + * @param port_id
> + *   The port identifier of the Ethernet device.
> + * @param queue_id
> + *   The index of the transmit queue through which output packets must be
> + *   sent.
> + *   The value must be in the range [0, nb_tx_queue - 1] previously supplied
> + *   to rte_eth_dev_configure().
> + * @param free_cnt
> + *   Maximum number of packets to free. Use 0 to indicate all possible packets
> + *   should be freed. Note that a packet may be using multiple mbufs.
> + * @return
> + *   Failure: < 0
> + *     -ENODEV: Invalid interface
> + *     -ENOTSUP: Driver does not support function
> + *   Success: >= 0
> + *     0-n: Number of packets freed. More packets may still remain in ring that
> + *     are in use.
> + */
> +
> +static inline int
> +rte_eth_tx_done_cleanup(uint8_t port_id, uint16_t queue_id,  uint32_t free_cnt)

Extra white space.

> +{
> +	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
> +
> +	/* Validate Input Data. Bail if not valid or not supported. */
> +	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
> +	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->tx_done_cleanup, -ENOTSUP);
> +
> +	/* Call driver to free pending mbufs. */
> +	return (*dev->dev_ops->tx_done_cleanup)(dev->data->tx_queues[queue_id],
> +			free_cnt);
> +}
> +

It doesn't look like this is something that needs to be in critical
path. Therefore it makes no sense to inline it.