Re: [dpdk-dev] [PATCH v2 1/3] security: add SA config option for inner pkt csum

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

Hi Anoob,

> >
> > External Email
> >
> > ----------------------------------------------------------------------
> > Hi Anoob,
> >
> > > Hi Konstanin,
> > >
> > > Please see inline.
> > >
> > > Thanks,
> > > Anoob
> > >
> > > > -----Original Message-----
> > > > From: Ananyev, Konstantin <konstantin.ananyev@intel.com>
> > > > Sent: Wednesday, September 29, 2021 4:26 PM
> > > > To: Archana Muniganti <marchana@marvell.com>; Akhil Goyal
> > > > <gakhil@marvell.com>; Nicolau, Radu <radu.nicolau@intel.com>; Zhang,
> > > > Roy Fan <roy.fan.zhang@intel.com>; hemant.agrawal@nxp.com
> > > > Cc: Anoob Joseph <anoobj@marvell.com>; Tejasree Kondoj
> > > > <ktejasree@marvell.com>; Ankur Dwivedi <adwivedi@marvell.com>; Jerin
> > > > Jacob Kollanukkaran <jerinj@marvell.com>; dev@dpdk.org
> > > > Subject: [EXT] RE: [PATCH v2 1/3] security: add SA config option for
> > > > inner pkt csum
> > > >
> > > > External Email
> > > >
> > > > --------------------------------------------------------------------
> > > > --
> > > > > Add inner packet IPv4 hdr and L4 checksum enable options in conf.
> > > > > These will be used in case of protocol offload.
> > > > > Per SA, application could specify whether the
> > > > > checksum(compute/verify) can be offloaded to security device.
> > > > >
> > > > > Signed-off-by: Archana Muniganti <marchana@marvell.com>
> > > > > ---
> > > > >  doc/guides/cryptodevs/features/default.ini |  1 +
> > > > >  doc/guides/rel_notes/deprecation.rst       |  4 ++--
> > > > >  doc/guides/rel_notes/release_21_11.rst     |  4 ++++
> > > > >  lib/cryptodev/rte_cryptodev.h              |  2 ++
> > > > >  lib/security/rte_security.h                | 18 ++++++++++++++++++
> > > > >  5 files changed, 27 insertions(+), 2 deletions(-)
> > > > >
> > > > > diff --git a/doc/guides/cryptodevs/features/default.ini
> > > > > b/doc/guides/cryptodevs/features/default.ini
> > > > > index c24814de98..96d95ddc81 100644
> > > > > --- a/doc/guides/cryptodevs/features/default.ini
> > > > > +++ b/doc/guides/cryptodevs/features/default.ini
> > > > > @@ -33,6 +33,7 @@ Non-Byte aligned data  =  Sym raw data path API
> > > > > = Cipher multiple data units =
> > > > >  Cipher wrapped key     =
> > > > > +Inner checksum         =
> > > > >
> > > > >  ;
> > > > >  ; Supported crypto algorithms of a default crypto driver.
> > > > > diff --git a/doc/guides/rel_notes/deprecation.rst
> > > > > b/doc/guides/rel_notes/deprecation.rst
> > > > > index 05fc2fdee7..8308e00ed4 100644
> > > > > --- a/doc/guides/rel_notes/deprecation.rst
> > > > > +++ b/doc/guides/rel_notes/deprecation.rst
> > > > > @@ -232,8 +232,8 @@ Deprecation Notices
> > > > >    IPsec payload MSS (Maximum Segment Size), and ESN (Extended
> > > > > Sequence
> > > > Number).
> > > > >
> > > > >  * security: The IPsec SA config options ``struct
> > > > > rte_security_ipsec_sa_options``
> > > > > -  will be updated with new fields to support new features like
> > > > > IPsec inner
> > > > > -  checksum, TSO in case of protocol offload.
> > > > > +  will be updated with new fields to support new features like
> > > > > + TSO in case of  protocol offload.
> > > > >
> > > > >  * ipsec: The structure ``rte_ipsec_sa_prm`` will be extended with a new
> > field
> > > > >    ``hdr_l3_len`` to configure tunnel L3 header length.
> > > > > diff --git a/doc/guides/rel_notes/release_21_11.rst
> > > > > b/doc/guides/rel_notes/release_21_11.rst
> > > > > index 8da851cccc..93d1b36889 100644
> > > > > --- a/doc/guides/rel_notes/release_21_11.rst
> > > > > +++ b/doc/guides/rel_notes/release_21_11.rst
> > > > > @@ -194,6 +194,10 @@ ABI Changes
> > > > >    ``rte_security_ipsec_xform`` to allow applications to configure SA soft
> > > > >    and hard expiry limits. Limits can be either in number of packets or bytes.
> > > > >
> > > > > +* security: The new options ``ip_csum_enable`` and
> > > > > +``l4_csum_enable`` were added
> > > > > +  in structure ``rte_security_ipsec_sa_options`` to indicate
> > > > > +whether inner
> > > > > +  packet IPv4 header checksum and L4 checksum need to be
> > > > > +offloaded to
> > > > > +  security device.
> > > > >
> > > > >  Known Issues
> > > > >  ------------
> > > > > diff --git a/lib/cryptodev/rte_cryptodev.h
> > > > > b/lib/cryptodev/rte_cryptodev.h index bb01f0f195..d9271a6c45
> > > > > 100644
> > > > > --- a/lib/cryptodev/rte_cryptodev.h
> > > > > +++ b/lib/cryptodev/rte_cryptodev.h
> > > > > @@ -479,6 +479,8 @@ rte_cryptodev_asym_get_xform_enum(enum
> > > > > rte_crypto_asym_xform_type *xform_enum,  /**< Support operations
> > > > > on
> > > > multiple data-units message */
> > > > >  #define RTE_CRYPTODEV_FF_CIPHER_WRAPPED_KEY		(1ULL
> > << 26)
> > > > >  /**< Support wrapped key in cipher xform  */
> > > > > +#define RTE_CRYPTODEV_FF_SECURITY_INNER_CSUM		(1ULL
> > > > << 27)
> > > > > +/**< Support inner checksum computation/verification */
> > > > >
> > > > >  /**
> > > > >   * Get the name of a crypto device feature flag diff --git
> > > > > a/lib/security/rte_security.h b/lib/security/rte_security.h index
> > > > > ab1a6e1f65..945f45ad76 100644
> > > > > --- a/lib/security/rte_security.h
> > > > > +++ b/lib/security/rte_security.h
> > > > > @@ -230,6 +230,24 @@ struct rte_security_ipsec_sa_options {
> > > > >  	 * * 0: Do not match UDP ports
> > > > >  	 */
> > > > >  	uint32_t udp_ports_verify : 1;
> > > > > +
> > > > > +	/** Compute/verify inner packet IPv4 header checksum in tunnel mode
> > > > > +	 *
> > > > > +	 * * 1: For outbound, compute inner packet IPv4 header checksum
> > > > > +	 *      before tunnel encapsulation and for inbound, verify after
> > > > > +	 *      tunnel decapsulation.
> > > > > +	 * * 0: Inner packet IP header checksum is not computed/verified.
> > > > > +	 */
> > > > > +	uint32_t ip_csum_enable : 1;
> > > > > +
> > > > > +	/** Compute/verify inner packet L4 checksum in tunnel mode
> > > > > +	 *
> > > > > +	 * * 1: For outbound, compute inner packet L4 checksum before
> > > > > +	 *      tunnel encapsulation and for inbound, verify after
> > > > > +	 *      tunnel decapsulation.
> > > > > +	 * * 0: Inner packet L4 checksum is not computed/verified.
> > > > > +	 */
> > > > > +	uint32_t l4_csum_enable : 1;
> > > >
> > > > As I understand these 2 new flags serve two purposes:
> > > > 1. report HW/PMD ability to perform these offloads.
> > > > 2. allow user to enable/disable this offload on SA basis.
> > >
> > > [Anoob] Correct
> > >
> > > >
> > > > One question I have - how it will work on data-path?
> > > > Would decision to perform these offloads be based on mbuf->ol_flags
> > > > value (same as we doing for ethdev TX offloads)?
> > > > Or some other approach is implied?
> > >
> > > [Anoob] There will be two settings. It can enabled per SA or enabled per
> > packet.
> >
> > Ok, will it be documented somewhere?
> > Or probably it already is, and I just missed/forgot it somehow?
> 
> [Anoob] Looks like we missed documenting this. Will update in the next version. Should we add documentation around SA options or around
> TX offload flags? I think it's better around SA options. 

Same thought here.
Thanks