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From: "Kinsella, Ray" <mdr@ashroe.eu>
To: Andrey Vesnovaty <andreyv@nvidia.com>, dev@dpdk.org
Cc: thomas@nvidia.net, orika@nvidia.com, viacheslavo@nvidia.com,
	andrey.vesnovaty@gmail.com, ozsh@nvidia.com, elibr@nvidia.com,
	alexr@nvidia.com, roniba@nvidia.com,
	Neil Horman <nhorman@tuxdriver.com>
Subject: Re: [dpdk-dev] [RFC 3/3] sft: introduce API
Date: Fri, 18 Sep 2020 14:34:48 +0100
Message-ID: <fd5a6056-c2f5-ca24-8076-66f6acde535b@ashroe.eu> (raw)
In-Reply-To: <20200909203008.25563-4-andreyv@nvidia.com>



On 09/09/2020 21:30, Andrey Vesnovaty wrote:
> Defines RTE SFT APIs for Statefull Flow Table library.
> 
> SFT General description:
> SFT library provides a framework for applications that need to maintain
> context across different packets of the connection.
> Examples for such applications:
> - Next-generation firewalls
> - Intrusion detection/prevention systems (IDS/IPS): Suricata, snort
> - SW/Virtual Switching: OVS
> The goals of the SFT library:
> - Accelerate flow recognition & its context retrieval for further
>   lookaside processing.
> - Enable context-aware flow handling offload.
> 
> Signed-off-by: Andrey Vesnovaty <andreyv@nvidia.com>
> ---
>  lib/librte_sft/Makefile            |  28 +
>  lib/librte_sft/meson.build         |   7 +
>  lib/librte_sft/rte_sft.c           |   9 +
>  lib/librte_sft/rte_sft.h           | 845 +++++++++++++++++++++++++++++
>  lib/librte_sft/rte_sft_driver.h    | 195 +++++++
>  lib/librte_sft/rte_sft_version.map |  21 +
>  6 files changed, 1105 insertions(+)
>  create mode 100644 lib/librte_sft/Makefile
>  create mode 100644 lib/librte_sft/meson.build
>  create mode 100644 lib/librte_sft/rte_sft.c
>  create mode 100644 lib/librte_sft/rte_sft.h
>  create mode 100644 lib/librte_sft/rte_sft_driver.h
>  create mode 100644 lib/librte_sft/rte_sft_version.map
> 
> diff --git a/lib/librte_sft/Makefile b/lib/librte_sft/Makefile
> new file mode 100644
> index 0000000000..23c6eee849
> --- /dev/null
> +++ b/lib/librte_sft/Makefile
> @@ -0,0 +1,28 @@
> +# SPDX-License-Identifier: BSD-3-Clause
> +# Copyright 2020 Mellanox Technologies, Ltd
> +
> +include $(RTE_SDK)/mk/rte.vars.mk
> +
> +# library name
> +LIB = librte_sft.a
> +
> +# library version
> +LIBABIVER := 1
> +
> +# build flags
> +CFLAGS += -O3
> +CFLAGS += $(WERROR_FLAGS)
> +LDLIBS += -lrte_eal -lrte_mbuf
> +
> +# library source files
> +# all source are stored in SRCS-y
> +SRCS-$(CONFIG_RTE_LIBRTE_REGEXDEV) := rte_sft.c
> +
> +# export include files
> +SYMLINK-$(CONFIG_RTE_LIBRTE_REGEXDEV)-include += rte_sft.h
> +SYMLINK-$(CONFIG_RTE_LIBRTE_REGEXDEV)-include += rte_sft_driver.h
> +
> +# versioning export map
> +EXPORT_MAP := rte_sft_version.map
> +
> +include $(RTE_SDK)/mk/rte.lib.mk
> diff --git a/lib/librte_sft/meson.build b/lib/librte_sft/meson.build
> new file mode 100644
> index 0000000000..b210e43f29
> --- /dev/null
> +++ b/lib/librte_sft/meson.build
> @@ -0,0 +1,7 @@
> +# SPDX-License-Identifier: BSD-3-Clause
> +# Copyright 2020 Mellanox Technologies, Ltd
> +
> +sources = files('rte_sft.c')
> +headers = files('rte_sft.h',
> +	'rte_sft_driver.h')
> +deps += ['mbuf']
> diff --git a/lib/librte_sft/rte_sft.c b/lib/librte_sft/rte_sft.c
> new file mode 100644
> index 0000000000..f3d3945545
> --- /dev/null
> +++ b/lib/librte_sft/rte_sft.c
> @@ -0,0 +1,9 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright 2020 Mellanox Technologies, Ltd
> + */
> +
> +
> +#include "rte_sft.h"
> +#include "rte_sft_driver.h"
> +
> +/* Placeholder for RTE SFT library APIs implementation */
> diff --git a/lib/librte_sft/rte_sft.h b/lib/librte_sft/rte_sft.h
> new file mode 100644
> index 0000000000..5c9f92ea9f
> --- /dev/null
> +++ b/lib/librte_sft/rte_sft.h
> @@ -0,0 +1,845 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright 2020 Mellanox Technologies, Ltd
> + */
> +
> +#ifndef _RTE_SFT_H_
> +#define _RTE_SFT_H_
> +
> +/**
> + * @file
> + *
> + * RTE SFT API
> + *
> + * Defines RTE SFT APIs for Statefull Flow Table library.
> + *
> + * SFT General description:
> + * SFT library provides a framework for applications that need to maintain
> + * context across different packets of the connection.
> + * Examples for such applications:
> + * - Next-generation firewalls
> + * - Intrusion detection/prevention systems (IDS/IPS): Suricata, Snort
> + * - SW/Virtual Switching: OVS
> + * The goals of the SFT library:
> + * - Accelerate flow recognition & its context retrieval for further lookaside
> + *   processing.
> + * - Enable context-aware flow handling offload.
> + *
> + * Definitions and Abbreviations:
> + * - 5-tuple: defined by:
> + *     -- Source IP address
> + *     -- Source port
> + *     -- Destination IP address
> + *     -- Destination port
> + *     -- IP protocol number
> + * - 7-tuple: 5-tuple zone and port (see struct rte_sft_7tuple)
> + * - 5/7-tuple: 5/7-tuple of the packet from connection initiator
> + * - revers 5/7-tuple: 5/7-tuple of the packet from connection initiate
> + * - application: SFT library API consumer
> + * - APP: see application
> + * - CID: client ID
> + * - CT: connection tracking
> + * - FID: Flow identifier
> + * - FIF: First In Flow
> + * - Flow: defined by 7-tuple and its reverse i.e. flow is bidirectional
> + * - SFT: Stateful Flow Table
> + * - user: see application
> + * - zone: additional user defined value used as differentiator for
> + *         connections having same 5-tuple (for example different VxLan
> + *         connections with same inner 5-tuple).
> + *
> + * SFT components:
> + *
> + * +-----------------------------------+
> + * | RTE flow                          |
> + * |                                   |
> + * | +-------------------------------+ |  +----------------+
> + * | | group X                       | |  | RTE_SFT        |
> + * | |                               | |  |                |
> + * | | +---------------------------+ | |  |                |
> + * | | | rule ...                  | | |  |                |
> + * | | | .                         | | |  +-----------+----+
> + * | | | .                         | | |              |
> + * | | | .                         | | |          entry
> + * | | +---------------------------+ | |            create
> + * | | | rule                      | | |              |
> + * | | |   patterns ...            +---------+        |
> + * | | |   actions                 | | |     |        |
> + * | | |     SFT (zone=Z)          | | |     |        |
> + * | | |     JUMP (group=Y)        | | |  lookup      |
> + * | | +---------------------------+ | |    zone=Z,   |
> + * | | | rule ...                  | | |    5tuple    |
> + * | | | .                         | | |     |        |
> + * | | | .                         | | |  +--v-------------+
> + * | | | .                         | | |  | SFT       |    |
> + * | | |                           | | |  |           |    |
> + * | | +---------------------------+ | |  |        +--v--+ |
> + * | |                               | |  |        |     | |
> + * | +-------------------------------+ |  |        | PMD | |
> + * |                                   |  |        |     | |
> + * |                                   |  |        +-----+ |
> + * | +-------------------------------+ |  |                |
> + * | | group Y                       | |  |                |
> + * | |                               | |  | set flow CTX   |
> + * | | +---------------------------+ | |  |                |
> + * | | | rule                      | | |  +--------+-------+
> + * | | |   patterns                | | |           |
> + * | | |     SFT (state=UNDEFINED) | | |           |
> + * | | |   actions RSS             | | |           |
> + * | | +---------------------------+ | |           |
> + * | | | rule                      | | |           |
> + * | | |   patterns                | | |           |
> + * | | |     SFT (state=INVALID)   | <-------------+
> + * | | |   actions DROP            | | |  forward
> + * | | +---------------------------+ | |    group=Y
> + * | | | rule                      | | |
> + * | | |   patterns                | | |
> + * | | |     SFT (state=ACCEPTED)  | | |
> + * | | |   actions PORT            | | |
> + * | | +---------------------------+ | |
> + * | |  ...                          | |
> + * | |                               | |
> + * | +-------------------------------+ |
> + * |  ...                              |
> + * |                                   |
> + * +-----------------------------------+
> + *
> + * SFT as datastructure:
> + * SFT can be treated as datastructure maintaining flow context across its
> + * lifetime. SFT flow entry represent bidirectional network flow and defined by
> + * 7-tuple & its reverse 7-tuple.
> + * Each entry in SFT has:
> + * - FID: 1:1 mapped & used as entry handle & encapsulating internal
> + *   implementation of the entry.
> + * - State: user-defined value attached to each entry, the only library
> + *   reserved value for state unset (the actual value defined by SFT
> + *   configuration). The application should define flow state encodings and
> + *   set it for flow via rte_sft_flow_set_ctx() than what actions should be
> + *   applied on packets can be defined via related RTE flow rule matching SFT
> + *   state (see rules in SFT components diagram above).
> + * - Timestamp: for the last seen in flow packet used for flow aging mechanism
> + *   implementation.
> + * - Client Objects: user-defined flow contexts attached as opaques to flow.
> + * - Acceleration & offloading - utilize RTE flow capabilities, when supported
> + *   (see action ``SFT``), for flow lookup acceleration and further
> + *   context-aware flow handling offload.
> + * - CT state: optionally for TCP connections CT state can be maintained
> + *   (see enum rte_sft_flow_ct_state).
> + * - Out of order TCP packets: optionally SFT can keep out of order TCP
> + *   packets aside the flow context till the arrival of the missing in-order
> + *   packet.
> + *
> + * RTE flow changes:
> + * The SFT flow state (or context) for RTE flow is defined by fields of
> + * struct rte_flow_item_sft.
> + * To utilize SFT capabilities new item and action types introduced:
> + * - item SFT: matching on SFT flow state (see RTE_FLOW_ITEM_TYPE_SFT).
> + * - action SFT: retrieve SFT flow context and attache it to the processed
> + *   packet (see RTE_FLOW_ACTION_TYPE_SFT).
> + *
> + * The contents of per port SFT serving RTE flow action ``SFT`` managed via
> + * SFT PMD APIs (see struct rte_sft_ops).
> + * The SFT flow state/context retrieval performed by user-defined zone ``SFT``
> + * action argument and processed packet 5-tuple.
> + * If in scope of action ``SFT`` there is no context/state for the flow in SFT
> + * undefined sate attached to the packet meaning that the flow is not
> + * recognized by SFT, most probably FIF packet.
> + *
> + * Once the SFT state set for a packet it can match on item SFT
> + * (see RTE_FLOW_ITEM_TYPE_SFT) and forwarding design can be done for the
> + * packet, for example:
> + * - if state value == x than queue for further processing by the application
> + * - if state value == y than forward it to eth port (full offload)
> + * - if state value == 'undefined' than queue for further processing by
> + *   the application (handle FIF packets)
> + *
> + * Processing packets with SFT library:
> + *
> + * FIF packet:
> + * To recognize upcoming packets of the SFT flow every FIF packet should be
> + * forwarded to the application utilizing the SFT library. Non-FIF packets can
> + * be processed by the application or its processing can be fully offloaded.
> + * Processing of the packets in SFT library starts with rte_sft_process_mbuf
> + * or rte_sft_process_mbuf_with_zone. If mbuf recognized as FIF application
> + * should make a design to destroy flow or complete flow creation process in
> + * SFT using rte_sft_flow_activate.
> + *
> + * Recognized SFT flow:
> + * Once struct rte_sft_flow_status with valid fid field posesed by application
> + * it can:
> + * - mange client objects on it (see client_obj field in
> + *   struct rte_sft_flow_status) using rte_sft_flow_<OP>_client_obj APIs
> + * - analyze user-defined flow state and CT state (see state & ct_sate fields
> + *   in struct rte_sft_flow_status).
> + * - set flow state to be attached to the upcoming packets by action ``SFT``
> + *   via struct rte_sft_flow_status API.
> + * - decide to destroy flow via rte_sft_flow_destroy API.
> + *
> + * Flow aging:
> + *
> + * SFT library manages the aging for each flow. On flow creation, it's
> + * assigned an aging value, the maximal number of seconds passed since the
> + * last flow packet arrived, once exceeded flow considered aged.
> + * The application notified of aged flow asynchronously via event queues.
> + * The device and port IDs tuple to identify the event queue to enqueue
> + * flow aged events passed on flow creation as arguments
> + * (see rte_sft_flow_activate). It's the application responsibility to
> + * initialize event queues and assign them to each flow for EOF event
> + * notifications.
> + * Aged EOF event handling:
> + * - Should be considered as application responsibility.
> + * - The last stage should be the release of the flow resources via
> + *    rte_sft_flow_destroy API.
> + * - All client objects should be removed from flow before the
> + *   rte_sft_flow_destroy API call.
> + * See the description of rete_sft_flow_destroy for an example of aged flow
> + * handling.
> + *
> + * SFT API thread safety:
> + *
> + * SFT library APIs are thread-safe while handling of specific flow can be
> + * done in a single thread simultaneously. Exclusive access to specific SFT
> + * flow guaranteed by:
> + * - rte_sft_process_mbuf
> + * - rte_sft_process_mbuf_with_zone
> + * - rte_sft_flow_create
> + * - rte_sft_flow_lock
> + * When application is done with the flow handling for the current packet it
> + * should call rte_sft_flow_unlock API to maintain exclusive access to the
> + * flow with other threads.
> + *
> + * SFT Library initialization and cleanup:
> + *
> + * SFT library should be considered as a single instance, preconfigured and
> + * initialized via rte_sft_init() API.
> + * SFT library resource deallocation and cleanup should be done via
> + * rte_sft_init() API as a stage of the application termination procedure.
> + */
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +#include <rte_common.h>
> +#include <rte_config.h>
> +#include <rte_errno.h>
> +#include <rte_mbuf.h>
> +#include <rte_ethdev.h>
> +#include <rte_flow.h>
> +
> +/**
> + * L3/L4 5-tuple - src/dest IP and port and IP protocol.
> + *
> + * Used for flow/connection identification.
> + */
> +struct rte_sft_5tuple {
> +	union {
> +		struct {
> +			rte_be32_t src_addr; /**< IPv4 source address. */
> +			rte_be32_t dst_addr; /**< IPv4 destination address. */
> +		} ipv4;
> +		struct {
> +			uint8_t src_addr[16]; /**< IPv6 source address. */
> +			uint8_t dst_addr[16]; /**< IPv6 destination address. */
> +		} ipv6;
> +	};
> +	uint16_t src_port; /**< Source port. */
> +	uint16_t dst_port; /**< Destination port. */
> +	uint8_t proto; /**< IP protocol. */
> +	uint8_t is_ipv6: 1; /**< True for valid IPv6 fields. Otherwise IPv4. */
> +};
> +
> +/**
> + * Port flow identification.
> + *
> + * @p zone used for setups where 5-tuple is not enough to identify flow.
> + * For example different VLANs/VXLANs may have similar 5-tuples.
> + */
> +struct rte_sft_7tuple {
> +	struct rte_sft_5tuple flow_5tuple; /**< L3/L4 5-tuple. */
> +	uint32_t zone; /**< Zone assigned to flow. */
> +	uint16_t port_id; /** <Port identifier of Ethernet device. */
> +};
> +
> +/**
> + * Flow connection tracking states
> + */
> +enum rte_sft_flow_ct_state {
> +	RTE_SFT_FLOW_CT_STATE_NEW  = (1 << 0),
> +	RTE_SFT_FLOW_CT_STATE_EST  = (1 << 1),
> +	RTE_SFT_FLOW_CT_STATE_REL  = (1 << 2),
> +	RTE_SFT_FLOW_CT_STATE_RPL  = (1 << 3),
> +	RTE_SFT_FLOW_CT_STATE_INV  = (1 << 4),
> +	RTE_SFT_FLOW_CT_STATE_TRK  = (1 << 5),
> +	RTE_SFT_FLOW_CT_STATE_SNAT = (1 << 6),
> +	RTE_SFT_FLOW_CT_STATE_DNAT = (1 << 7),
> +};
> +
> +/**
> + * Structure describes SFT library configuration
> + */
> +struct rte_sft_conf {
> +	uint32_t UDP_aging; /**< UDP proto default aging. */
> +	uint32_t TCP_aging; /**< TCP proto default aging. */
> +	uint32_t TCP_SYN_aging; /**< TCP SYN default aging. */
> +	uint32_t OTHER_aging; /**< All unlisted proto default aging. */
> +	uint32_t size; /**< Max entries in SFT. */
> +	uint8_t undefined_state; /**< Undefined state constant. */
> +	uint8_t reorder_enable: 1;
> +	/**< TCP packet reordering feature enabled bit. */
> +	uint8_t ct_enable: 1; /**< Connection tracking feature enabled bit. */
> +};
> +
> +/**
> + * Structure describes the state of the flow in SFT.
> + */
> +struct rte_sft_flow_status {
> +	uint32_t fid; /**< SFT flow id. */
> +	uint32_t zone; /**< Zone for lookup in SFT */
> +	uint8_t state; /**< Application defined bidirectional flow state. */
> +	uint8_t ct_state; /**< Connection tracking flow state. */
> +	uint32_t age; /**< Seconds passed since last flown packet. */
> +	uint32_t aging;
> +	/**< Flow considered aged once this age (seconds) reached. */
> +	uint32_t nb_in_order_mbufs;
> +	/**< Number of in-order mbufs available for drain */
> +	void **client_obj; /**< Array of clients attached to flow. */
> +	int nb_clients; /**< Number of clients attached to flow. */
> +	uint8_t defined: 1; /**< Flow defined in SFT bit. */
> +	uint8_t activated: 1; /**< Flow activation bit. */
> +	uint8_t fragmented: 1; /**< Last flow mbuf was fragmented. */
> +	uint8_t out_of_order: 1; /**< Last flow mbuf was out of order (TCP). */
> +};
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Get SFT flow status.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * @param fid
> + *   SFT flow ID.
> + * @param[out] status
> + *   Structure to dump actual SFT flow status.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +rte_sft_flow_get_status(const uint32_t fid,
> +			struct rte_sft_flow_status *status,
> +			struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Set user defined context.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * Updates per ethernet dev SFT entries:
> + * - flow lookup acceleration
> + * - partial/full flow offloading managed by flow context
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * @param fid
> + *   SFT flow ID.
> + * @param ctx
> + *   User defined state to set.
> + *   Update of *fid* or *zone* fields in struct rte_flow_item_sft unsupported.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success , a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +rte_sft_flow_set_ctx(uint32_t fid,
> +		     const struct rte_flow_item_sft *ctx,
> +		     struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Initialize SFT library instance.
> + *
> + * @param conf
> + *   SFT library instance configuration.
> + *
> + * @return
> + *   0 on success , a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +rte_sft_init(const struct rte_sft_conf *conf);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Finalize SFT library instance.
> + * Cleanup & release allocated resources.
> + */
> +void
> +rte_sft_fini(void);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Process mbuf received on RX queue.
> + *
> + * Fragmentation handling (SFT fragmentation feature configured):
> + * If *mbuf_in* of fragmented packet received it will be stored by SFT library.
> + * status->fragmented bit will be set and *mbuf_out* will be set to NULL.
> + * On reception of all related fragments of IP packet it will be reassembled
> + * and further processed by this function on reception of last fragment.
> + *
> + * Flow definition:
> + * SFT flow defined by one of its 7-tuples, since there is no zone value as
> + * argument flow should be defined by context attached to mbuf with action
> + * ``SFT`` (see RTE flow RTE_FLOW_ACTION_TYPE_SFT). Otherwise status->defined
> + * field will be turned off & *mbuf_out* will be set to *mbuf_in*.
> + * In order to define flow for *mbuf_in* without attached sft context
> + * rte_sft_process_mbuf_with_zone() should be used with *zone* argument
> + * supplied by caller.
> + *
> + * Flow lookup:
> + * If SFT flow identifier can't be retrieved from SFT context attached to
> + * *mbuf_in* by action ``SFT`` - SFT lookup should be performmed by zone,
> + * retrieved from SFT context attached to *mbuf_in*, and 5-tuple, extracted
> + * form mbuf outer header contents.
> + *
> + * Flow defined but does not exists:
> + * If flow not found in SFT inactivated flow will be created in SFT.
> + * status->activated field will be turned off & *mbuf_out* be set to *mbuf_in*.
> + * In order to activate created flow rte_sft_flow_activate() should be used
> + * with reverse 7-tuple supplied by caller.
> + * This is first phase of flow creation in SFT for second phase & more detailed
> + * descriotion of flow creation see rte_sft_flow_activate.
> + *
> + * Out of order (SFT out of oreder feature configured):
> + * If flow defined & activated but *mbuf_in* is TCP out of order packet it will
> + * be stored by SFT library. status->out_of_order bit will be set & *mbuf_out*
> + * will be set to NULL. On reception of the first missing in order packet
> + * status->nb_in_order_mbufs will be set to number of mbufs that available for
> + * processing with rte_sft_drain_mbuf().
> + *
> + * Flow defined & activated, mbuf not fragmented and 'in order':
> + * - Flow aging related data (see age field in `struct rte_sft_flow_status`)
> + *   will be updated according to *mbuf_in* timestamp.
> + * - Flow connection tracking state (see ct_state field in
> + *   `struct rte_sft_flow_status`)  will be updated according to *mbuf_in* L4
> + *   header contents.
> + * - *mbuf_out* will be set to last processed mbuf.
> + *
> + * @param[in] mbuf_in
> + *   mbuf to process; mbuf pinter considered 'consumed' and should not be used
> + *   after successful call to this function.
> + * @param[out] mbuf_out
> + *   last processed not fragmented and in order mbuf.
> + * @param[out] status
> + *   Structure to dump SFT flow status once updated according to contents of
> + *   *mbuf_in*.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success:
> + *   - *mbuf_out* contains valid mbuf pointer, locked SFT flow recognized by
> + *     status->fid.
> + *   - *mbuf_out* is NULL and status->fragmented bit on in case of
> + *     non last fragment *mbuf_in*.
> + *   - *mbuf_out* is NULL and status->out_of_order bit on in case of out of
> + *     order *mbuf_in*, locked SFT flow recognized by status->fid.
> + *   On failure a negative errno value and rte_errno is set.
> + */
> +int
> +rte_sft_process_mbuf(struct rte_mbuf *mbuf_in,
> +		     struct rte_mbuf **mbuf_out,
> +		     struct rte_sft_flow_status *status,
> +		     struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Process mbuf received on RX queue while zone value provided by caller.
> + *
> + * The behaviour of this function is similar to rte_sft_process_mbuf except
> + * the lookup in SFT procedure. The lookup in SFT always done by the *zone*
> + * arg and 5-tuple 5-tuple, extracted form mbuf outer header contents.
> + *
> + * @see rte_sft_process_mbuf
> + *
> + * @param[in] mbuf_in
> + *   mbuf to process; mbuf pinter considered 'consumed' and should not be used
> + *   after successful call to this function.
> + * @param[out] mbuf_out
> + *   last processed not fragmented and in order mbuf.
> + * @param[out] status
> + *   Structure to dump SFT flow status once updated according to contents of
> + *   *mbuf_in*.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success:
> + *   - *mbuf_out* contains valid mbuf pointer.
> + *   - *mbuf_out* is NULL and status->fragmented bit on in case of
> + *     non last fragment *mbuf_in*.
> + *   - *mbuf_out* is NULL and status->out_of_order bit on in case of out of
> + *     order *mbuf_in*.
> + *   On failure a negative errno value and rte_errno is set.
> + */
> +int
> +rte_sft_process_mbuf_with_zone(struct rte_mbuf *mbuf_in,
> +			       uint32_t zone,
> +			       struct rte_mbuf **mbuf_out,
> +			       struct rte_sft_flow_status *status,
> +			       struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Drain next in order mbuf.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * This function behaves similar to rte_sft_process_mbuf() but acts on packets
> + * accumulated in SFT flow due to missing in order packet. Processing done on
> + * single mbuf at a time and `in order`. Other than above the behavior is
> + * same as of rte_sft_process_mbuf for flow defined & activated & mbuf isn't
> + * fragmented & 'in order'. This function should be called when
> + * rte_sft_process_mbuf or rte_sft_process_mbuf_with_zone sets
> + * status->nb_in_order_mbufs output param !=0 and until
> + * status->nb_in_order_mbufs == 0.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * @param fid
> + *   SFT flow ID.
> + * @param[out] status
> + *   Structure to dump SFT flow status once updated according to contents of
> + *   *mbuf_in*.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   A valid mbuf in case of success, NULL otherwise and rte_errno is set.
> + */
> +struct rte_mbuf *
> +rte_sft_drain_mbuf(uint32_t fid,
> +		   struct rte_sft_flow_status *status,
> +		   struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Activate flow in SFT.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * This function performs second phase of flow creation in SFT.
> + * The reasons for 2 phase flow creation procedure:
> + * 1. Missing reverse flow - flow context is shared for both flow directions
> + *    i.e. in order maintain bidirectional flow context in RTE SFT packets
> + *    arriving from both dirrections should be identified as packets of the
> + *    RTE SFT flow. Consequently before creation of the SFT flow caller should
> + *    provide reverse flow direction 7-tuple.
> + * 2. The caller of rte_sft_process_mbuf/rte_sft_process_mbuf_with_zone should
> + *   be notified that arrived mbuf is first in flow & decide weather to
> + *   create new flow or it distroy before it was activated with
> + *   rte_sft_flow_destroy.
> + * This function completes creation of the bidirectional SFT flow & creates
> + * entry for 7-tuple on SFT PMD defined by the tuple port for both
> + * initiator/initiate 7-tuples.
> + * Flow aging, connection tracking state & out of order handling will be
> + * initialized according to the content of the *mbuf_in* passes to
> + * rte_sft_process_mbuf/_with_zone during the phase 1 of flow creation.
> + * Once this function returns upcoming calls rte_sft_process_mbuf/_with_zone
> + * with 7-tuple or its reverse will return handle to this flow.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * @param fid
> + *   SFT flow ID.
> + * @param reverse_tuple
> + *   Expected response flow 7-tuple.
> + * @param ctx
> + *   User defined state to set.
> + *   Update of *fid* or *zone* fields in struct rte_flow_item_sft unsupported.
> + * @param ct_enable
> + *   Enables maintenance of status->ct_state connection tracking value for the
> + *   flow; otherwise status->ct_state will be initialized with zeros.
> + * @param evdev_id
> + *   Event dev ID to enqueue end of flow event.
> + * @param evport_id
> + *   Event port ID to enqueue end of flow event.
> + * @param[out] status
> + *   Structure to dump SFT flow status once activated.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +rte_sft_flow_activate(uint32_t fid,
> +		      const struct rte_sft_7tuple *reverse_tuple,
> +		      const struct rte_flow_item_sft *ctx,
> +		      uint8_t ct_enable,
> +		      uint8_t dev_id,
> +		      uint8_t port_id,
> +		      struct rte_sft_flow_status *status,
> +		      struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Artificially create SFT flow.
> + *
> + * Function to create SFT flow before reception of the first flow packet.
> + *
> + * @param tuple
> + *   Expected initiator flow 7-tuple.
> + * @param reverse_tuple
> + *   Expected initiate flow 7-tuple.
> + * @param ctx
> + *   User defined state to set.
> + *   Setting of *fid* or *zone* fields in struct rte_flow_item_sft unsupported.
> + * @param[out] ct_enable
> + *   Enables maintenance of status->ct_state connection tracking value for the
> + *   flow; otherwise status->ct_state will be initialized with zeros.
> + * @param[out] status
> + *   Structure to dump SFT flow status once created.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   - on success: 0, locked SFT flow recognized by status->fid.
> + *   - on error: a negative errno value otherwise and rte_errno is set.
> + */
> +
> +int
> +rte_sft_flow_create(const struct rte_sft_7tuple *tuple,
> +		    const struct rte_sft_7tuple *reverse_tuple,
> +		    const struct rte_flow_item_sft *ctx,
> +		    uint8_t ct_enable,
> +		    struct rte_sft_flow_status *status,
> +		    struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Lock exclusively SFT flow.
> + *
> + * Explicit flow locking; used for handling aged flows.
> + *
> + * @param fid
> + *   SFT flow ID.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +rte_sft_flow_lock(uint32_t fid);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Release exclusively locked SFT flow.
> + *
> + * When rte_sft_process_mbuf/_with_zone and rte_sft_flow_create
> + * return *status* containing fid with defined bit on the flow considered
> + * exclusively locked and should be unlocked with this function.
> + *
> + * @param fid
> + *   SFT flow ID.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +rte_sft_flow_unlock(uint32_t fid);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Removes flow from SFT.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * - Flow should be locked by caller in order to remove it.
> + * - Flow should have no client objects attached.
> + *
> + * Should be applied on aged flows, when flow aged event received.
> + *
> + * @code{.c}
> + *     while (1) {
> + *         rte_event_dequeue_burst(...);
> + *         FOR_EACH_EV(ev) {
> + *             uint32_t fid = ev.u64;
> + *             rte_sft_flow_lock(fid);
> + *             FOR_EACH_CLIENT(fid, client_id) {
> + *                 rte_sft_flow_reset_client_obj(fid, client_obj);
> + *                 // detached client object handling
> + *             }
> + *             rte_sft_flow_destroy(fid, &error);
> + *         }
> + *     }
> + * @endcode
> + *
> + * @param fid
> + *   SFT flow ID to destroy.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +rte_sft_flow_destroy(uint32_t fid, struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Reset flow age to zero.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * Simulates last flow packet with timestamp set to just now.
> + *
> + * @param fid
> + *   SFT flow ID.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +rte_sft_flow_touch(uint32_t fid, struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Set flow aging to specific value.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * @param fid
> + *   SFT flow ID.
> + * @param aging
> + *   New flow aging value.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +rte_sft_flow_set_aging(uint32_t fid,
> +		       uint32_t aging,
> +		       struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Set client object for given client ID.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * @param fid
> + *   SFT flow ID.
> + * @param client_id
> + *   Client ID to set object for.
> + * @param client_obj
> + *   Pointer to opaque client object structure.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +rte_sft_flow_set_client_obj(uint32_t fid,
> +			    uint8_t client_id,
> +			    void *client_obj,
> +			    struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Get client object for given client ID.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * @param fid
> + *   SFT flow ID.
> + * @param client_id
> + *   Client ID to get object for.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   A valid client object opaque pointer in case of success, NULL otherwise
> + *   and rte_errno is set.
> + */
> +void *
> +rte_sft_flow_get_client_obj(const uint32_t fid,
> +			    uint8_t client_id,
> +			    struct rte_sft_error *error);
> +
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Remove client object for given client ID.
> + * Flow should be locked by caller (see rte_sft_flow_lock).
> + *
> + * Detaches client object from SFT flow and returns the ownership for the
> + * client object to the caller by returning client object pointer value.
> + * The pointer returned by this function won't be accessed any more, the caller
> + * may release all client obj related resources & the memory allocated for
> + * this client object.
> + *
> + * @param fid
> + *   SFT flow ID.
> + * @param client_id
> + *   Client ID to remove object for.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   A valid client object opaque pointer in case of success, NULL otherwise
> + *   and rte_errno is set.
> + */
> +void *
> +rte_sft_flow_reset_client_obj(uint32_t fid,
> +			      uint8_t client_id,
> +			      struct rte_sft_error *error);
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif /* _RTE_SFT_H_ */
> diff --git a/lib/librte_sft/rte_sft_driver.h b/lib/librte_sft/rte_sft_driver.h
> new file mode 100644
> index 0000000000..0c9e28fe17
> --- /dev/null
> +++ b/lib/librte_sft/rte_sft_driver.h
> @@ -0,0 +1,195 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright 2020 Mellanox Technologies, Ltd
> + */
> +
> +#ifndef _RTE_SFT_DRIVER_H_
> +#define _RTE_SFT_DRIVER_H_
> +
> +/**
> + * @file
> + *
> + * RTE SFT Ethernet device PMD API
> + *
> + * APIs that are used by the SFT library to offload SFT operationons
> + * to Ethernet device.
> + */
> +
> +#include "rte_sft.h"
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +/**
> + * Opaque type returned after successfully creating an entry in SFT.
> + *
> + * This handle can be used to manage and query the related entry (e.g. to
> + * destroy it or update age).
> + */
> +struct rte_sft_entry;
> +
> +/**
> + * Create SFT entry in eth_dev SFT.
> + *
> + * @param dev
> + *   Pointer to Ethernet device structure.
> + * @param tuple
> + *   L3/L4 5-tuple - src/dest IP and port and IP protocol.
> + * @param nat_tuple
> + *   L3/L4 5-tuple to replace in packet original 5-tuple in order to implement
> + *   NAT offloading; if NULL NAT offloading won't be configured for the flow.
> + * @param aging
> + *   Flow aging timeout in seconds.
> + * @param ctx
> + *   Initial values in SFT flow context
> + *   (see RTE flow struct rte_flow_item_sft).
> + *   ctx->zone should be valid.
> + * @param fid
> + *   SFT flow ID for the entry to create on *device*.
> + *   If there is an entry for the *fid* in PMD it will be updated with the
> + *   values of *ctx*.
> + * @param[out] queue_index
> + *   if PMD can figure out the queue where the flow packets will
> + *   arrive in RX data path it will set the value of queue_index; otherwise
> + *   all bits will be turned on.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   A valid handle in case of success, NULL otherwise and rte_errno is set.
> + */
> +typedef struct rte_sft_entry *(*sft_entry_create_t) (struct rte_eth_dev *dev,
> +		const struct rte_sft_5tuple *tuple,
> +		const struct rte_sft_5tuple *nat_tuple,
> +		const uint32_t aging,
> +		const struct rte_flow_item_sft *ctx,
> +		const uint32_t fid,
> +		uint16_t *queue_index,
> +		struct rte_sft_error *error);
> +
> +/**
> + * Destroy SFT entry in eth_dev SFT.
> + *
> + * @param dev
> + *   Pointer to Ethernet device structure.
> + * @param entry
> + *   Handle to the SFT entry to destroy.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +typedef int (*sft_entry_destroy_t)(struct rte_eth_dev *dev,
> +		struct rte_sft_entry *entry,
> +		struct rte_sft_error *error);
> +
> +/**
> + * Decodes SFT flow context if attached to mbuf by action ``SFT``.
> + * @see RTE flow RTE_FLOW_ACTION_TYPE_SFT.
> + *
> + * @param dev
> + *   Pointer to Ethernet device structure.
> + * @param mbuf
> + *   mbuf of the packet to decode attached state from.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   A valid SFT flow context in case of success, NULL otherwise and rte_errno
> + *   is set.
> + */
> +typedef struct rte_flow_item_sft *(*sft_entry_mbuf_decode_ctx_t)(
> +		struct rte_eth_dev *dev,
> +		const struct rte_mbuf *mbuf,
> +		struct rte_sft_error *error);
> +
> +/**
> + * Get aged-out SFT entries.
> + *
> + * Report entry as aged-out if timeout passed without any matching
> + * on the SFT entry.
> + *
> + * @param[in] dev
> + *   Pointer to Ethernet device structure.
> + * @param[in, out] fid_aged
> + *   The address of an array of aged-out SFT flow IDs.
> + * @param[in] nb_aged
> + *   The length of *fid_aged* array pointers.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. Initialized in case of
> + *   error only.
> + *
> + * @return
> + *   if nb_aged is 0, return the amount of all aged flows.
> + *   if nb_aged is not 0 , return the amount of aged flows reported
> + *   in the *fid_aged* array, otherwise negative errno value.
> + */
> +typedef int (*sft_entry_get_aged_entries_t)(struct rte_eth_dev *dev,
> +		uint32_t *fid_aged,
> +		int nb_aged,
> +		struct rte_sft_error *error);
> +
> +/**
> + * Simulate SFT entry match in terms of entry aging.
> + *
> + * @param dev
> + *   Pointer to Ethernet device structure.
> + * @param fid
> + *   SFT flow ID paired with dev to retrieve related SFT entry.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +typedef int (*sft_entry_touch_t)(struct rte_eth_dev *dev,
> +		uint32_t fid,
> +		struct rte_sft_error *error);
> +
> +/**
> + * Set SFT entry aging to specific value.
> + *
> + * @param dev
> + *   Pointer to Ethernet device structure.
> + * @param fid
> + *   SFT flow ID paired with dev to retrieve related SFT entry.
> + * @param aging
> + *   New entry aging value.
> + * @param[out] error
> + *   Perform verbose error reporting if not NULL. PMDs initialize this
> + *   structure in case of error only.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +typedef int (*sft_entry_set_aging_t)(struct rte_eth_dev *dev,
> +		uint32_t fid,
> +		uint32_t aging,
> +		struct rte_sft_error *error);
> +
> +/** SFT operations function pointer table */
> +struct rte_sft_ops {
> +	sft_entry_create_t entry_create;
> +	/**< Create SFT entry in eth_dev SFT. */
> +	sft_entry_destroy_t entry_destroy;
> +	/**< Destroy SFT entry in eth_dev SFT. */
> +	sft_entry_mbuf_decode_ctx_t mbuf_decode_ctx;
> +	/**< Decodes SFT flow context if attached to mbuf by action ``SFT``. */
> +	sft_entry_get_aged_entries_t get_aged_entries;
> +	/**< Get aged-out SFT entries. */
> +	sft_entry_touch_t entry_touch;
> +	/**< Simulate SFT entry match in terms of entry aging. */
> +	sft_entry_set_aging_t set_aging;
> +	/**< Set SFT entry aging to specific value. */
> +};
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif /* _RTE_SFT_DRIVER_H_ */
> diff --git a/lib/librte_sft/rte_sft_version.map b/lib/librte_sft/rte_sft_version.map
> new file mode 100644
> index 0000000000..747e100ac5
> --- /dev/null
> +++ b/lib/librte_sft/rte_sft_version.map
> @@ -0,0 +1,21 @@
> +EXPERIMENTAL {
> +	global:
> +
> +	rte_sft_flow_get_status;
> +	rte_sft_flow_set_ctx;
> +	rte_sft_init;
> +	rte_sft_fini;
> +	rte_sft_process_mbuf;
> +	rte_sft_process_mbuf_with_zone;
> +	rte_sft_drain_mbuf;
> +	rte_sft_flow_activate;
> +	rte_sft_flow_create;
> +	rte_sft_flow_lock;
> +	rte_sft_flow_unlock;
> +	rte_sft_flow_destroy;
> +	rte_sft_flow_touch;
> +	rte_sft_flow_set_aging;
> +	rte_sft_flow_set_client_obj;
> +	rte_sft_flow_get_client_obj;
> +	rte_sft_flow_reset_client_obj;
> +};
> 

Missing the __rte_experimental  attribute in front of all these in the header.

  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-09 20:30 [dpdk-dev] [RFC 0/3] introduce Stateful Flow Table Andrey Vesnovaty
2020-09-09 20:30 ` [dpdk-dev] [RFC 1/3] ethdev: add item/action for SFT Andrey Vesnovaty
2020-09-16 15:46   ` Ori Kam
2020-09-18  7:04     ` Andrew Rybchenko
2020-09-09 20:30 ` [dpdk-dev] [RFC 2/3] ethdev: support SFT APIs Andrey Vesnovaty
2020-09-09 20:30 ` [dpdk-dev] [RFC 3/3] sft: introduce API Andrey Vesnovaty
2020-09-16 18:33   ` Ori Kam
2020-09-18  7:43     ` Andrew Rybchenko
2020-11-02 10:49       ` Andrey Vesnovaty
2020-09-18 13:34   ` Kinsella, Ray [this message]
2020-09-15 11:59 ` [dpdk-dev] [RFC 0/3] introduce Stateful Flow Table Andrey Vesnovaty
2020-11-04 12:59 ` [dpdk-dev] [PATCH v2 0/2] introduce stateful flow table Ori Kam
2020-11-04 12:59   ` [dpdk-dev] [PATCH v2 1/2] ethdev: add item/action for SFT Ori Kam
2020-11-04 12:59   ` [dpdk-dev] [PATCH v2 2/2] ethdev: introduce sft lib Ori Kam
2020-11-04 13:17 ` [dpdk-dev] [RFC v3 0/2] introduce stateful flow table Ori Kam
2020-11-04 13:17   ` [dpdk-dev] [RFC v3 1/2] ethdev: add item/action for SFT Ori Kam
2020-11-04 13:17   ` [dpdk-dev] [RFC v3 2/2] ethdev: introduce sft lib Ori Kam

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