Re: [dpdk-dev] [DPDK] net/ixgbe: fix missing Port Representor data-path callbacks

[Mohammad Abdul Awal <mohammad.abdul.awal@intel.com>]

On 09/05/2018 16:00, Remy Horton wrote:
> This patch adds Rx and Tx burst functions to the ixgbe
> Port Representors, so that the implementation within
> ixgbe PMD can be tested using applications such as
> testpmd which require data-path functionality.
>
> Fixes: cf80ba6e2038 ("net/ixgbe: add support for representor ports")
>
> Signed-off-by: Remy Horton <remy.horton@intel.com>
> ---
>   drivers/net/ixgbe/ixgbe_vf_representor.c | 27 ++++++++++++++++++++++++---
>   1 file changed, 24 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ixgbe/ixgbe_vf_representor.c b/drivers/net/ixgbe/ixgbe_vf_representor.c
> index 8f8af49..21c44d1 100644
> --- a/drivers/net/ixgbe/ixgbe_vf_representor.c
> +++ b/drivers/net/ixgbe/ixgbe_vf_representor.c
> @@ -153,6 +153,25 @@ struct eth_dev_ops ixgbe_vf_representor_dev_ops = {
>   	.mac_addr_set		= ixgbe_vf_representor_mac_addr_set,
>   };
>   
> +static uint16_t
> +ixgbe_vf_representor_rx_burst(__rte_unused void *rx_queue,
> +	__rte_unused struct rte_mbuf **rx_pkts, __rte_unused uint16_t nb_pkts)
> +{
> +	return 0;
> +}
> +
> +static uint16_t
> +ixgbe_vf_representor_tx_burst(__rte_unused void *tx_queue,
> +	struct rte_mbuf **tx_pkts,
> +	uint16_t nb_pkts)
> +{
> +	uint16_t idx_pkt;
> +
> +	for (idx_pkt = 0; idx_pkt < nb_pkts; idx_pkt++)
> +		rte_pktmbuf_free(tx_pkts[idx_pkt]);
We should not free them in the driver silently whereas the application 
will think that it has been sent successfully.
Please use the same rule for rx_burst, and return 0.
> +	return nb_pkts;
> +}
> +
>   int
>   ixgbe_vf_representor_init(struct rte_eth_dev *ethdev, void *init_params)
>   {
> @@ -182,9 +201,11 @@ ixgbe_vf_representor_init(struct rte_eth_dev *ethdev, void *init_params)
>   	/* Set representor device ops */
>   	ethdev->dev_ops = &ixgbe_vf_representor_dev_ops;
>   
> -	/* No data-path so no RX/TX functions */
> -	ethdev->rx_pkt_burst = NULL;
> -	ethdev->tx_pkt_burst = NULL;
> +	/* No data-path, but need stub Rx/Tx functions to avoid crash
> +	 * when testing with the likes of testpmd.
> +	 */
> +	ethdev->rx_pkt_burst = ixgbe_vf_representor_rx_burst;
> +	ethdev->tx_pkt_burst = ixgbe_vf_representor_tx_burst;
>   
>   	/* Setting the number queues allocated to the VF */
>   	ethdev->data->nb_rx_queues = IXGBE_VF_MAX_RX_QUEUES;