[dpdk-dev] [PATCH 3/8] net/bnxt: add support for rx_descriptor_status

[Ferruh Yigit]

On 8/24/2017 5:29 PM, Ajit Khaparde wrote:
> add support for rx_descriptor_status dev_op
> Signed-off-by: Ajit Khaparde <ajit.khaparde at broadcom.com>

<...>

> +static int
> +bnxt_rx_descriptor_status_op(void *rx_queue, uint16_t offset)
> +{
> +	struct bnxt_rx_queue *rxq = (struct bnxt_rx_queue *)rx_queue;
> +	struct bnxt_cp_ring_info *cpr;
> +	struct rx_pkt_cmpl *rxcmp;
> +	uint32_t cons;
> +
> +	if (!rxq)
> +		return -EINVAL;
> +
> +	cpr = rxq->cp_ring;
> +
> +	if (offset >= rxq->nb_rx_desc)
> +		return -EINVAL;
> +
> +	cons = RING_CMP(cpr->cp_ring_struct, offset);
> +	rxcmp = (struct rx_pkt_cmpl *)&cpr->cp_desc_ring[cons];
> +
> +	if (CMP_VALID(rxcmp, offset, cpr->cp_ring_struct))
> +		return RTE_ETH_RX_DESC_DONE;
> +
> +	return RTE_ETH_RX_DESC_AVAIL;

Do we need a check to be sure if descriptor is available. Is PMD using
rx_free_thresh?

If so descriptor can be in a state that packet parsed by software but
descriptor not freed yet: RTE_ETH_RX_DESC_UNAVAIL

> +}

<...>