[RFC 1/3] ethdev: support GRE optional fields

[Sean Zhang (Networking SW)]

Hi Ori,

> -----Original Message-----
> From: Ori Kam <orika at nvidia.com>
> Sent: Sunday, January 9, 2022 8:30 PM
> To: Sean Zhang (Networking SW) <xiazhang at nvidia.com>; Matan Azrad
> <matan at nvidia.com>; NBU-Contact-Thomas Monjalon (EXTERNAL)
> <thomas at monjalon.net>; Ferruh Yigit <ferruh.yigit at intel.com>; Andrew
> Rybchenko <andrew.rybchenko at oktetlabs.ru>
> Cc: dev at dpdk.org
> Subject: RE: [RFC 1/3] ethdev: support GRE optional fields
> 
> Hi Sean,
> 
> 
> > -----Original Message-----
> > From: Sean Zhang <xiazhang at nvidia.com>
> > Subject: [RFC 1/3] ethdev: support GRE optional fields
> >
> > Add flow pattern items and header format for matching optional fields
> > (checksum/key/sequence) in GRE header. And the flags in gre item
> > should be correspondingly set with the new added items.
> >
> > Signed-off-by: Sean Zhang <xiazhang at nvidia.com>
> > ---
> >  doc/guides/prog_guide/rte_flow.rst | 16 ++++++++++++++++
> >  lib/ethdev/rte_flow.c              |  1 +
> >  lib/ethdev/rte_flow.h              | 18 ++++++++++++++++++
> >  3 files changed, 35 insertions(+)
> >
> > diff --git a/doc/guides/prog_guide/rte_flow.rst
> > b/doc/guides/prog_guide/rte_flow.rst
> > index c51ed88..48d5685 100644
> > --- a/doc/guides/prog_guide/rte_flow.rst
> > +++ b/doc/guides/prog_guide/rte_flow.rst
> > @@ -1113,6 +1113,22 @@ This should be preceded by item ``GRE``.
> >  - Value to be matched is a big-endian 32 bit integer.
> >  - When this item present it implicitly match K bit in default mask as "1"
> >
> > +Item: ``GRE_OPTION``
> > +^^^^^^^^^^^^^^^^^^^^
> > +
> > +Matches a GRE optional fields (checksum/key/sequence).
> > +This should be preceded by item ``GRE``.
> > +
> > +- ``checksum``: checksum.
> > +- ``key``: key.
> > +- ``sequence``: sequence.
> > +- The items in GRE_OPTION do not change bit flags(c_bit/k_bit/s_bit)
> > +in GRE
> > +  item. The bit flags need be set with GRE item by application. When
> > +the items
> > +  present, the corresponding bits in GRE spec and mask should be set
> > +"1" by
> > +  application, it means to match specified value of the fields. When
> > +the items
> > +  no present, but the corresponding bits in GRE spec and mask is "1",
> > +it means
> > +  to match any value of the fields.
> > +
> >  Item: ``FUZZY``
> >  ^^^^^^^^^^^^^^^
> >
> > diff --git a/lib/ethdev/rte_flow.c b/lib/ethdev/rte_flow.c index
> > a93f68a..03bd1df 100644
> > --- a/lib/ethdev/rte_flow.c
> > +++ b/lib/ethdev/rte_flow.c
> > @@ -139,6 +139,7 @@ struct rte_flow_desc_data {
> >  	MK_FLOW_ITEM(META, sizeof(struct rte_flow_item_meta)),
> >  	MK_FLOW_ITEM(TAG, sizeof(struct rte_flow_item_tag)),
> >  	MK_FLOW_ITEM(GRE_KEY, sizeof(rte_be32_t)),
> > +	MK_FLOW_ITEM(GRE_OPTION, sizeof(struct rte_gre_hdr_option)),
> 
> I think that this new item is making the gre_key redundant, why not
> deprecate it?

Do you mean to add description like bellow?

  Item: ``GRE_KEY``
  ^^^^^^^^^^^^^^^
 +This action is deprecated. Consider `Item: GRE_OPTION`.

> 
> >  	MK_FLOW_ITEM(GTP_PSC, sizeof(struct rte_flow_item_gtp_psc)),
> >  	MK_FLOW_ITEM(PPPOES, sizeof(struct rte_flow_item_pppoe)),
> >  	MK_FLOW_ITEM(PPPOED, sizeof(struct rte_flow_item_pppoe)), diff -
> -git
> > a/lib/ethdev/rte_flow.h b/lib/ethdev/rte_flow.h index 1031fb2..27b4140
> > 100644
> > --- a/lib/ethdev/rte_flow.h
> > +++ b/lib/ethdev/rte_flow.h
> > @@ -660,6 +660,13 @@ enum rte_flow_item_type {
> >  	 * See struct rte_flow_item_ppp.
> >  	 */
> >  	RTE_FLOW_ITEM_TYPE_PPP,
> > +
> > +	/**
> > +	 * Matches GRE optional fields.
> > +	 *
> > +	 * See struct rte_gre_hdr_option.
> > +	 */
> > +	RTE_FLOW_ITEM_TYPE_GRE_OPTION,
> >  };
> >
> >  /**
> > @@ -1196,6 +1203,17 @@ struct rte_flow_item_gre {  #endif
> >
> >  /**
> > + * RTE_FLOW_ITEM_TYPE_GRE_OPTION.
> > + *
> > + * Matches GRE optional fields in header.
> > + */
> > +struct rte_gre_hdr_option {
> > +	rte_be16_t checksum;
> > +	rte_be32_t key;
> > +	rte_be32_t sequence;
> > +};
> > +
> > +/**
> >   * RTE_FLOW_ITEM_TYPE_FUZZY
> >   *
> >   * Fuzzy pattern match, expect faster than default.
> > --
> > 1.8.3.1
> 
> Best,
> Ori

Thanks,
Sean