Re: [dpdk-dev] [EXT] [RFC v5] regexdev: introduce regexdev subsystem

[Ori Kam <orika@mellanox.com>]

Hi Pavan,

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Pavan Nikhilesh Bhagavatula
> Sent: Sunday, March 1, 2020 3:23 PM
> To: Ori Kam <orika@mellanox.com>; Jerin Jacob Kollanukkaran
> <jerinj@marvell.com>; xiang.w.wang@intel.com
> Cc: dev@dpdk.org; Shahaf Shuler <shahafs@mellanox.com>;
> hemant.agrawal@nxp.com; Opher Reviv <opher@mellanox.com>; Alex
> Rosenbaum <alexr@mellanox.com>; Dovrat Zifroni <dovrat@marvell.com>;
> Prasun Kapoor <pkapoor@marvell.com>; nipun.gupta@nxp.com;
> bruce.richardson@intel.com; yang.a.hong@intel.com; harry.chang@intel.com;
> gu.jian1@zte.com.cn; shanjiangh@chinatelecom.cn;
> zhangy.yun@chinatelecom.cn; lixingfu@huachentel.com; wushuai@inspur.com;
> yuyingxia@yxlink.com; fanchenggang@sunyainfo.com;
> davidfgao@tencent.com; liuzhong1@chinaunicom.cn;
> zhaoyong11@huawei.com; oc@yunify.com; jim@netgate.com;
> hongjun.ni@intel.com; j.bromhead@titan-ic.com; deri@ntop.org;
> fc@napatech.com; arthur.su@lionic.com; Thomas Monjalon
> <thomas@monjalon.net>
> Subject: Re: [dpdk-dev] [EXT] [RFC v5] regexdev: introduce regexdev subsystem
> 
> Hi Ori,
> 
> >
> >Hi Pavan,
> >Thanks for the comments please see below.
> >
> >> -----Original Message-----
> >> From: dev <dev-bounces@dpdk.org> On Behalf Of Pavan Nikhilesh
> >Bhagavatula
> >> Sent: Sunday, March 1, 2020 8:13 AM
> >> To: Ori Kam <orika@mellanox.com>; Jerin Jacob Kollanukkaran
> >> <jerinj@marvell.com>; xiang.w.wang@intel.com
> >> Cc: dev@dpdk.org; Shahaf Shuler <shahafs@mellanox.com>;
> >> hemant.agrawal@nxp.com; Opher Reviv <opher@mellanox.com>;
> >Alex
> >> Rosenbaum <alexr@mellanox.com>; Dovrat Zifroni
> ><dovrat@marvell.com>;
> >> Prasun Kapoor <pkapoor@marvell.com>; nipun.gupta@nxp.com;
> >> bruce.richardson@intel.com; yang.a.hong@intel.com;
> >harry.chang@intel.com;
> >> gu.jian1@zte.com.cn; shanjiangh@chinatelecom.cn;
> >> zhangy.yun@chinatelecom.cn; lixingfu@huachentel.com;
> >wushuai@inspur.com;
> >> yuyingxia@yxlink.com; fanchenggang@sunyainfo.com;
> >> davidfgao@tencent.com; liuzhong1@chinaunicom.cn;
> >> zhaoyong11@huawei.com; oc@yunify.com; jim@netgate.com;
> >> hongjun.ni@intel.com; j.bromhead@titan-ic.com; deri@ntop.org;
> >> fc@napatech.com; arthur.su@lionic.com; Thomas Monjalon
> >> <thomas@monjalon.net>
> >> Subject: Re: [dpdk-dev] [EXT] [RFC v5] regexdev: introduce regexdev
> >subsystem
> >>
> >> Hi Ori,
> >>
> >> Minor comments below.
> >>
> >> <snip>
> >>
> >> >+/**
> >> >+ * The generic *rte_regex_ops* structure to hold the RegEx
> >attributes
> >> >+ * for enqueue and dequeue operation.
> >> >+ */
> >> >+struct rte_regex_ops {
> >> >+	/* W0 */
> >> >+	uint16_t req_flags;
> >> >+	/**< Request flags for the RegEx ops.
> >> >+	 * @see RTE_REGEX_OPS_REQ_*
> >> >+	 */
> >> >+	uint16_t rsp_flags;
> >> >+	/**< Response flags for the RegEx ops.
> >> >+	 * @see RTE_REGEX_OPS_RSP_*
> >> >+	 */
> >> >+	uint16_t nb_actual_matches;
> >> >+	/**< The total number of actual matches detected by the
> >> >Regex device.*/
> >> >+	uint16_t nb_matches;
> >> >+	/**< The total number of matches returned by the RegEx
> >> >device for this
> >> >+	 * scan. The size of *rte_regex_ops::matches* zero length array
> >> >will be
> >> >+	 * this value.
> >> >+	 *
> >> >+	 * @see struct rte_regex_ops::matches, struct
> >> >rte_regex_match
> >> >+	 */
> >> >+
> >> >+	/* W1 */
> >> >+	struct rte_mbuf mbuf; /**< source mbuf, to search in. */
> >>
> >> This should be *mbuf.
> >
> >Yes you are correct will fix.
> >
> >>
> >> >+
> >> >+	/* W2 */
> >> >+	uint16_t group_id0;
> >>
> >> This should be group_id1.
> >>
> >No this is correct is should be id0. We are starting from group 0.
> >The comment below states that the first group, meaning group 0 must
> >be
> >valid group while group 1 doesn’t have to be vaild.
> 
> Would that mean that group_id0 is always valid?
> Since there is no `RTE_REGEX_OPS_REQ_GROUP_ID0_VALID_F` flag.
> 
Yes, you must have at least one group.

> >
> >> >+	/**< First group_id to match the rule against. Minimum one
> >> >group id
> >> >+	 * must be provided by application.
> >> >+	 * When RTE_REGEX_OPS_REQ_GROUP_ID1_VALID_F set then
> >> >group_id1
> >> >+	 * is valid, respectively similar flags for group_id2 and group_id3.
> >> >+	 * Upon the match, struct rte_regex_match::group_id shall be
> >> >updated
> >> >+	 * with matching group ID by the device. Group ID scheme
> >> >provides
> >> >+	 * rule isolation and effective pattern matching.
> >> >+	 */
> >> >+	uint16_t group_id1;
> >> >+	/**< Second group_id to match the rule against.
> >> >+	 *
> >> >+	 * @see RTE_REGEX_OPS_REQ_GROUP_ID1_VALID_F
> >> >+	 */
> >>
> >> The above `group_id1` should be removed as its duplicate.
> >>
> >
> >This is not duplicate, see above comment.
> >
> >> >+	uint16_t group_id2;
> >> >+	/**< Third group_id to match the rule against.
> >> >+	 *
> >> >+	 * @see RTE_REGEX_OPS_REQ_GROUP_ID2_VALID_F
> >> >+	 */
> >> >+	uint16_t group_id3;
> >> >+	/**< Forth group_id to match the rule against.
> >> >+	 *
> >> >+	 * @see RTE_REGEX_OPS_REQ_GROUP_ID3_VALID_F
> >> >+	 */
> >> >+
> >> >+	/* W3 */
> >> >+	RTE_STD_C11
> >> >+	union {
> >> >+		uint64_t user_id;
> >> >+		/**< Application specific opaque value. An application
> >> >may use
> >> >+		 * this field to hold application specific value to share
> >> >+		 * between dequeue and enqueue operation.
> >> >+		 * Implementation should not modify this field.
> >> >+		 */
> >> >+		void *user_ptr;
> >> >+		/**< Pointer representation of *user_id* */
> >> >+	};
> >> >+
> >> >+	/* W4 */
> >> >+	struct rte_regex_match matches[];
> >> >+	/**< Zero length array to hold the match tuples.
> >> >+	 * The struct rte_regex_ops::nb_matches value holds the
> >> >number of
> >> >+	 * elements in this array.
> >> >+	 *
> >> >+	 * @see struct rte_regex_ops::nb_matches
> >> >+	 */
> >> >+};