Re: [dpdk-dev] [PATCH v2 1/2] lib/security: add support for get metadata

[Radu Nicolau <radu.nicolau@intel.com>]

On 11/22/2017 6:55 AM, Anoob Joseph wrote:
> In case of inline protocol processed ingress traffic, the packet may not
> have enough information to determine the security parameters with which
> the packet was processed. For such cases, application could register a
> 64 bit metadata in security session, which could be retrieved from the
> packet using "rte_security_get_pkt_metadata" API. Application can use
> this metadata to identify the parameters it need.
>
> Application can choose what it should register as the metadata. It can
> register SPI or a pointer to SA.
>
> Signed-off-by: Anoob Joseph <anoob.joseph@caviumnetworks.com>
> ---
> v2:
> * Replaced get_session and get_cookie APIs with get_pkt_metadata API
>
>   lib/librte_security/rte_security.c        | 13 +++++++++++++
>   lib/librte_security/rte_security.h        | 19 +++++++++++++++++++
>   lib/librte_security/rte_security_driver.h | 16 ++++++++++++++++
>   3 files changed, 48 insertions(+)
>
> diff --git a/lib/librte_security/rte_security.c b/lib/librte_security/rte_security.c
> index 1227fca..804f11f 100644
> --- a/lib/librte_security/rte_security.c
> +++ b/lib/librte_security/rte_security.c
> @@ -108,6 +108,19 @@ rte_security_set_pkt_metadata(struct rte_security_ctx *instance,
>   					       sess, m, params);
>   }
>   
> +uint64_t
> +rte_security_get_pkt_metadata(struct rte_security_ctx *instance,
> +			      struct rte_mbuf *pkt)
> +{
> +	uint64_t mdata = 0;
> +
> +	RTE_FUNC_PTR_OR_ERR_RET(*instance->ops->get_pkt_metadata, 0);
> +	if (instance->ops->get_pkt_metadata(instance->device, pkt, &mdata))
> +		return 0;
> +
> +	return mdata;
> +}
> +
Can you change the returned type to void *?
>   const struct rte_security_capability *
>   rte_security_capabilities_get(struct rte_security_ctx *instance)
>   {
> diff --git a/lib/librte_security/rte_security.h b/lib/librte_security/rte_security.h
> index 653929b..aa3a471 100644
> --- a/lib/librte_security/rte_security.h
> +++ b/lib/librte_security/rte_security.h
> @@ -274,6 +274,8 @@ struct rte_security_session_conf {
>   	/**< Configuration parameters for security session */
>   	struct rte_crypto_sym_xform *crypto_xform;
>   	/**< Security Session Crypto Transformations */
> +	uint64_t metadata;
> +	/**< Metadata registered by application */
>   };
Can you rename it to userdata?
>   
>   struct rte_security_session {
> @@ -346,6 +348,23 @@ rte_security_set_pkt_metadata(struct rte_security_ctx *instance,
>   			      struct rte_mbuf *mb, void *params);
>   
>   /**
> + * Get metadata from the packet. This is an application registered 64 bit
> + * value, associated with the security session which processed the packet.
> + *
> + * This is valid only for inline processed ingress packets.
> + *
> + * @param   instance	security instance
> + * @param   pkt		packet mbuf
> + *
> + * @return
> + *  - On success, metadata
> + *  - On failure, 0
> + */
> +uint64_t
> +rte_security_get_pkt_metadata(struct rte_security_ctx *instance,
> +			      struct rte_mbuf *pkt);
> +
> +/**
>    * Attach a session to a symmetric crypto operation
>    *
>    * @param	sym_op	crypto operation
> diff --git a/lib/librte_security/rte_security_driver.h b/lib/librte_security/rte_security_driver.h
> index 997fbe7..da0ebf4 100644
> --- a/lib/librte_security/rte_security_driver.h
> +++ b/lib/librte_security/rte_security_driver.h
> @@ -122,6 +122,20 @@ typedef int (*security_set_pkt_metadata_t)(void *device,
>   		void *params);
>   
>   /**
> + * Get application interpretable metadata from the packet.
> + *
> + * @param	device		Crypto/eth device pointer
> + * @param	pkt		Packet mbuf
> + * @param	mt		Pointer to receive metadata
> + *
> + * @return
> + *  - Returns 0 if metadata is retrieved successfully.
> + *  - Returns -ve value for errors.
> + */
> +typedef int (*security_get_pkt_metadata_t)(void *device,
> +		struct rte_mbuf *pkt, uint64_t *mt);
> +
> +/**
>    * Get security capabilities of the device.
>    *
>    * @param	device		crypto/eth device pointer
> @@ -145,6 +159,8 @@ struct rte_security_ops {
>   	/**< Clear a security sessions private data. */
>   	security_set_pkt_metadata_t set_pkt_metadata;
>   	/**< Update mbuf metadata. */
> +	security_get_pkt_metadata_t get_pkt_metadata;
> +	/**< Get metadata from packet. */
>   	security_capabilities_get_t capabilities_get;
>   	/**< Get security capabilities. */
>   };