[PATCH v6 1/3] ethdev: introduce IP reassembly offload

[Ferruh Yigit]

On 2/8/2022 10:20 PM, Akhil Goyal wrote:
> IP Reassembly is a costly operation if it is done in software.
> The operation becomes even more costlier if IP fragments are encrypted.
> However, if it is offloaded to HW, it can considerably save application
> cycles.
> 
> Hence, a new offload feature is exposed in eth_dev ops for devices which
> can attempt IP reassembly of packets in hardware.
> - rte_eth_ip_reassembly_capability_get() - to get the maximum values
>    of reassembly configuration which can be set.
> - rte_eth_ip_reassembly_conf_set() - to set IP reassembly configuration
>    and to enable the feature in the PMD (to be called before
>    rte_eth_dev_start()).
> - rte_eth_ip_reassembly_conf_get() - to get the current configuration
>    set in PMD.
> 
> Now when the offload is enabled using rte_eth_ip_reassembly_conf_set(),
> the resulting reassembled IP packet would be a typical segmented mbuf in
> case of success.
> 
> And if reassembly of IP fragments is failed or is incomplete (if
> fragments do not come before the reass_timeout, overlap, etc), the mbuf
> dynamic flags can be updated by the PMD. This is updated in a subsequent
> patch.
> 
> Signed-off-by: Akhil Goyal<gakhil at marvell.com>

Reviewed-by: Ferruh Yigit <ferruh.yigit at intel.com>