[dpdk-dev] [PATCH v4 02/15] crypto: add total raw buffer length

[Ananyev, Konstantin]

> The current crypto raw data vectors is extended to support
> rte_security usecases, where we need total data length to know
> how much additional memory space is available in buffer other
> than data length so that driver/HW can write expanded size
> data after encryption.
> 
> Signed-off-by: Gagandeep Singh <g.singh at nxp.com>
> Acked-by: Akhil Goyal <gakhil at marvell.com>
> ---
>  doc/guides/rel_notes/deprecation.rst | 7 -------
>  lib/cryptodev/rte_crypto_sym.h       | 7 +++++++
>  2 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
> index a4e86b31f5..53155459a0 100644
> --- a/doc/guides/rel_notes/deprecation.rst
> +++ b/doc/guides/rel_notes/deprecation.rst
> @@ -188,13 +188,6 @@ Deprecation Notices
>    This field will be null for inplace processing.
>    This change is targeted for DPDK 21.11.
> 
> -* cryptodev: The structure ``rte_crypto_vec`` would be updated to add
> -  ``tot_len`` to support total buffer length.
> -  This is required for security cases like IPsec and PDCP encryption offload
> -  to know how much additional memory space is available in buffer other than
> -  data length so that driver/HW can write expanded size data after encryption.
> -  This change is targeted for DPDK 21.11.
> -
>  * cryptodev: Hide structures ``rte_cryptodev_sym_session`` and
>    ``rte_cryptodev_asym_session`` to remove unnecessary indirection between
>    session and the private data of session. An opaque pointer can be exposed
> diff --git a/lib/cryptodev/rte_crypto_sym.h b/lib/cryptodev/rte_crypto_sym.h
> index dcc0bd5933..6be283e83c 100644
> --- a/lib/cryptodev/rte_crypto_sym.h
> +++ b/lib/cryptodev/rte_crypto_sym.h
> @@ -37,6 +37,8 @@ struct rte_crypto_vec {
>  	rte_iova_t iova;
>  	/** length of the data buffer */
>  	uint32_t len;
> +	/** total buffer length */
> +	uint32_t tot_len;
>  };
> 
>  /**
> @@ -980,12 +982,14 @@ rte_crypto_mbuf_to_vec(const struct rte_mbuf *mb, uint32_t ofs, uint32_t len,
>  	seglen = mb->data_len - ofs;
>  	if (len <= seglen) {
>  		vec[0].len = len;
> +		vec[0].tot_len = mb->buf_len - rte_pktmbuf_headroom(mb) - ofs;
>  		return 1;
>  	}
> 
>  	/* data spread across segments */
>  	vec[0].len = seglen;
>  	left = len - seglen;
> +	vec[0].tot_len = mb->buf_len - rte_pktmbuf_headroom(mb) - ofs;

As a nit this line and similar line above can be merged into one and put
before 'if' statement above, i.e.:

vec[0].base = rte_pktmbuf_mtod_offset(mb, void *, ofs);
vec[0].iova = rte_pktmbuf_iova_offset(mb, ofs);
vec[0].tot_len = mb->buf_len - rte_pktmbuf_headroom(mb) - ofs;

>  	for (i = 1, nseg = mb->next; nseg != NULL; nseg = nseg->next, i++) {
> 
>  		vec[i].base = rte_pktmbuf_mtod(nseg, void *);
> @@ -995,6 +999,8 @@ rte_crypto_mbuf_to_vec(const struct rte_mbuf *mb, uint32_t ofs, uint32_t len,
>  		if (left <= seglen) {
>  			/* whole requested data is completed */
>  			vec[i].len = left;
> +			vec[i].tot_len = mb->buf_len - rte_pktmbuf_headroom(mb)
> +					- ofs;

Same as above - these two lines can be put as one before 'if'.


>  			left = 0;
>  			break;
>  		}
> @@ -1002,6 +1008,7 @@ rte_crypto_mbuf_to_vec(const struct rte_mbuf *mb, uint32_t ofs, uint32_t len,
>  		/* use whole segment */
>  		vec[i].len = seglen;
>  		left -= seglen;
> +		vec[i].tot_len = mb->buf_len - rte_pktmbuf_headroom(mb) - ofs;
>  	}
> 
>  	RTE_ASSERT(left == 0);
> --
> 2.17.1

With nits above applied:
Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>