[dpdk-dev] [PATCH] doc: announce ABI change for rte_eth_dev structure
Vlad Zolotarov
vladz at cloudius-systems.com
Sun Jul 31 09:46:05 CEST 2016
On 07/20/2016 05:24 PM, Tomasz Kulasek wrote:
> This is an ABI deprecation notice for DPDK 16.11 in librte_ether about
> changes in rte_eth_dev and rte_eth_desc_lim structures.
>
> In 16.11, we plan to introduce rte_eth_tx_prep() function to do
> necessary preparations of packet burst to be safely transmitted on
> device for desired HW offloads (set/reset checksum field according to
> the hardware requirements) and check HW constraints (number of segments
> per packet, etc).
>
> While the limitations and requirements may differ for devices, it
> requires to extend rte_eth_dev structure with new function pointer
> "tx_pkt_prep" which can be implemented in the driver to prepare and
> verify packets, in devices specific way, before burst, what should to
> prevent application to send malformed packets.
>
> Also new fields will be introduced in rte_eth_desc_lim: nb_seg_max and
> nb_mtu_seg_max, providing an information about max segments in TSO and
> non TSO packets acceptable by device.
>
> Signed-off-by: Tomasz Kulasek <tomaszx.kulasek at intel.com>
Acked-by: Vlad Zolotarov <vladz at scylladb.com>
> ---
> doc/guides/rel_notes/deprecation.rst | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
> index f502f86..485aacb 100644
> --- a/doc/guides/rel_notes/deprecation.rst
> +++ b/doc/guides/rel_notes/deprecation.rst
> @@ -41,3 +41,10 @@ Deprecation Notices
> * The mempool functions for single/multi producer/consumer are deprecated and
> will be removed in 16.11.
> It is replaced by rte_mempool_generic_get/put functions.
> +
> +* In 16.11 ABI changes are plained: the ``rte_eth_dev`` structure will be
> + extended with new function pointer ``tx_pkt_prep`` allowing verification
> + and processing of packet burst to meet HW specific requirements before
> + transmit. Also new fields will be added to the ``rte_eth_desc_lim`` structure:
> + ``nb_seg_max`` and ``nb_mtu_seg_max`` provideing information about number of
> + segments limit to be transmitted by device for TSO/non-TSO packets.
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