[dpdk-dev] [PATCH 1/2] cryptodev: add min headroom and tailroom requirement
Akhil Goyal
akhil.goyal at nxp.com
Thu Jun 21 16:24:31 CEST 2018
On 6/19/2018 11:56 AM, Anoob Joseph wrote:
> Enabling crypto devs to specify the minimum headroom and tailroom it
> expects in the mbuf. For net PMDs, standard headroom has to be honoured
> by applications, which is not strictly followed for crypto devs. This
> prevents crypto devs from using free space in mbuf (available as
> head/tailroom) for internal requirements in crypto operations. Addition
> of head/tailroom requirement will help PMDs to communicate such
> requirements to the application.
>
> The availability and use of head/tailroom is an optimization if the
> hardware supports use of head/tailroom for crypto-op info. For devices
> that do not support using the head/tailroom, they can continue to operate
> without any performance-drop.
>
> Signed-off-by: Anoob Joseph <anoob.joseph at caviumnetworks.com>
> ---
> doc/guides/rel_notes/deprecation.rst | 4 ++++
> lib/librte_cryptodev/rte_cryptodev.h | 6 ++++++
> 2 files changed, 10 insertions(+)
>
> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
> index 1ce692e..a547289 100644
> --- a/doc/guides/rel_notes/deprecation.rst
> +++ b/doc/guides/rel_notes/deprecation.rst
> @@ -122,3 +122,7 @@ Deprecation Notices
> - Function ``rte_cryptodev_get_private_session_size()`` will be deprecated
> in 18.05, and it gets replaced with ``rte_cryptodev_sym_get_private_session_size()``.
> It will be removed in 18.08.
> + - New field, ``min_headroom_req``, added in ``rte_cryptodev_info`` structure. It will be
> + added in 18.11.
> + - New field, ``min_tailroom_req``, added in ``rte_cryptodev_info`` structure. It will be
> + added in 18.11.
Is this targeted for 18.08 or 18.11?
> diff --git a/lib/librte_cryptodev/rte_cryptodev.h b/lib/librte_cryptodev/rte_cryptodev.h
> index 92ce6d4..fa944b8 100644
> --- a/lib/librte_cryptodev/rte_cryptodev.h
> +++ b/lib/librte_cryptodev/rte_cryptodev.h
> @@ -382,6 +382,12 @@ struct rte_cryptodev_info {
> unsigned max_nb_queue_pairs;
> /**< Maximum number of queues pairs supported by device. */
>
> + uint32_t min_headroom_req;
> + /**< Minimum mbuf headroom required by device */
> +
> + uint32_t min_tailroom_req;
> + /**< Minimum mbuf tailroom required by device */
> +
> struct {
> unsigned max_nb_sessions;
> /**< Maximum number of sessions supported by device. */
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