Re: [dpdk-dev] [PATCH 1/5] ethdev: add API to negotiate support for Rx meta information

["Kinsella, Ray" <mdr@ashroe.eu>]

On 02/09/2021 15:23, Ivan Malov wrote:
> Per-packet meta information (flag, mark and the likes) might
> be expensive to deliver in terms of small packet performance.
> If the features are not enabled by default, enabling them at
> short notice (for example, when a flow rule with action MARK
> gets created) without traffic disruption may not be possible.
> 
> Letting applications request delivery of Rx meta information
> during initialisation can solve the said problem efficiently.
> 
> Technically, that could be accomplished by defining new bits
> in DEV_RX_OFFLOAD namespace, but the ability to extract meta
> data cannot be considered an offload on its own. For example,
> Rx checksumming is an offload, while mark delivery is not as
> it needs an external party, a flow rule with action MARK, to
> hold the value and trigger mark insertion in the first place.
> 
> With this in mind, add a means to let applications negotiate
> adapter support for the very delivery of Rx meta information.
> 
> Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
> Reviewed-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
> ---
>  lib/ethdev/ethdev_driver.h | 19 +++++++++++
>  lib/ethdev/rte_ethdev.c    | 25 +++++++++++++++
>  lib/ethdev/rte_ethdev.h    | 66 ++++++++++++++++++++++++++++++++++++++
>  lib/ethdev/version.map     |  3 ++
>  4 files changed, 113 insertions(+)
> 
Acked-by: Ray Kinsella <mdr@ashroe.eu>