[dpdk-dev] [PATCH 4/4] ethdev: add helpers to move to the new offloads API

[Ananyev, Konstantin]

Hi Shahaf,

>  }
> 
> +/**
> + * A conversion function from rxmode offloads API to rte_eth_rxq_conf
> + * offloads API.
> + */
> +static void
> +rte_eth_convert_rxmode_offloads(struct rte_eth_rxmode *rxmode,
> +				struct rte_eth_rxq_conf *rxq_conf)
> +{
> +	if (rxmode->header_split == 1)
> +		rxq_conf->offloads |= DEV_RX_OFFLOAD_HEADER_SPLIT;
> +	if (rxmode->hw_ip_checksum == 1)
> +		rxq_conf->offloads |= DEV_RX_OFFLOAD_CHECKSUM;
> +	if (rxmode->hw_vlan_filter == 1)
> +		rxq_conf->offloads |= DEV_RX_OFFLOAD_VLAN_FILTER;

Thinking on it a bit more:
VLAN_FILTER is definitely one per device, as it would affect VFs also.
At least that's what we have for Intel devices (ixgbe, i40e) right now.
For Intel devices VLAN_STRIP is also per device and
will also be  applied to all corresponding VFs.
In fact, right now it is possible to query/change these 3 vlan offload flags on the fly
(after dev_start) on  port basis by rte_eth_dev_(get|set)_vlan_offload API.
So, I think at least these 3 flags need to be remained on a port basis.
In fact, why can't we have both per port and per queue RX offload:
- dev_configure() will accept RX_OFFLOAD_* flags and apply them on a port basis.
- rx_queue_setup() will also accept RX_OFFLOAD_* flags and apply them on a queue basis.
- if particular RX_OFFLOAD flag for that device couldn't be setup on a queue basis  -
   rx_queue_setup() will return an error.
- rte_eth_rxq_info can be extended to provide information which RX_OFFLOADs
  can be configured on a per queue basis.
BTW - in that case we probably wouldn't need ignore flag inside rx_conf anymore.


> +	if (rxmode->hw_vlan_strip == 1)
> +		rxq_conf->offloads |= DEV_RX_OFFLOAD_VLAN_STRIP;
> +	if (rxmode->hw_vlan_extend == 1)
> +		rxq_conf->offloads |= DEV_RX_OFFLOAD_VLAN_EXTEND;
> +	if (rxmode->jumbo_frame == 1)
> +		rxq_conf->offloads |= DEV_RX_OFFLOAD_JUMBO_FRAME;

There are some extra checks for that flag inside rte_eth_dev_configure().
If we going so support it per queue - then it probably need to be updated. 

> +	if (rxmode->hw_strip_crc == 1)
> +		rxq_conf->offloads |= DEV_RX_OFFLOAD_CRC_STRIP;
> +	if (rxmode->enable_scatter == 1)
> +		rxq_conf->offloads |= DEV_RX_OFFLOAD_SCATTER;
> +	if (rxmode->enable_lro == 1)
> +		rxq_conf->offloads |= DEV_RX_OFFLOAD_TCP_LRO;
> +}
> +

Konstantin