[dpdk-dev] [PATCH v18 1/8] dmadev: introduce DMA device library public APIs

[Chengwen Feng <fengchengwen@huawei.com>]

The 'dmadevice' is a generic type of DMA device.

This patch introduce the 'dmadevice' public APIs which expose generic
operations that can enable configuration and I/O with the DMA devices.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Jerin Jacob <jerinjacobk@gmail.com>
---
 doc/api/doxy-api-index.md |   1 +
 doc/api/doxy-api.conf.in  |   1 +
 lib/dmadev/meson.build    |   4 +
 lib/dmadev/rte_dmadev.h   | 949 ++++++++++++++++++++++++++++++++++++++++++++++
 lib/dmadev/version.map    |  24 ++
 lib/meson.build           |   1 +
 6 files changed, 980 insertions(+)
 create mode 100644 lib/dmadev/meson.build
 create mode 100644 lib/dmadev/rte_dmadev.h
 create mode 100644 lib/dmadev/version.map

diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
index 1992107..ce08250 100644
--- a/doc/api/doxy-api-index.md
+++ b/doc/api/doxy-api-index.md
@@ -27,6 +27,7 @@ The public API headers are grouped by topics:
   [event_timer_adapter]    (@ref rte_event_timer_adapter.h),
   [event_crypto_adapter]   (@ref rte_event_crypto_adapter.h),
   [rawdev]             (@ref rte_rawdev.h),
+  [dmadev]             (@ref rte_dmadev.h),
   [metrics]            (@ref rte_metrics.h),
   [bitrate]            (@ref rte_bitrate.h),
   [latency]            (@ref rte_latencystats.h),
diff --git a/doc/api/doxy-api.conf.in b/doc/api/doxy-api.conf.in
index 325a019..a44a92b 100644
--- a/doc/api/doxy-api.conf.in
+++ b/doc/api/doxy-api.conf.in
@@ -34,6 +34,7 @@ INPUT                   = @TOPDIR@/doc/api/doxy-api-index.md \
                           @TOPDIR@/lib/cmdline \
                           @TOPDIR@/lib/compressdev \
                           @TOPDIR@/lib/cryptodev \
+                          @TOPDIR@/lib/dmadev \
                           @TOPDIR@/lib/distributor \
                           @TOPDIR@/lib/efd \
                           @TOPDIR@/lib/ethdev \
diff --git a/lib/dmadev/meson.build b/lib/dmadev/meson.build
new file mode 100644
index 0000000..6d5bd85
--- /dev/null
+++ b/lib/dmadev/meson.build
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2021 HiSilicon Limited.
+
+headers = files('rte_dmadev.h')
diff --git a/lib/dmadev/rte_dmadev.h b/lib/dmadev/rte_dmadev.h
new file mode 100644
index 0000000..40ae3b1
--- /dev/null
+++ b/lib/dmadev/rte_dmadev.h
@@ -0,0 +1,949 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2021 HiSilicon Limited.
+ * Copyright(c) 2021 Intel Corporation.
+ * Copyright(c) 2021 Marvell International Ltd.
+ * Copyright(c) 2021 SmartShare Systems.
+ */
+
+#ifndef _RTE_DMADEV_H_
+#define _RTE_DMADEV_H_
+
+/**
+ * @file rte_dmadev.h
+ *
+ * RTE DMA (Direct Memory Access) device APIs.
+ *
+ * The DMA framework is built on the following model:
+ *
+ *     ---------------   ---------------       ---------------
+ *     | virtual DMA |   | virtual DMA |       | virtual DMA |
+ *     | channel     |   | channel     |       | channel     |
+ *     ---------------   ---------------       ---------------
+ *            |                |                      |
+ *            ------------------                      |
+ *                     |                              |
+ *               ------------                    ------------
+ *               |  dmadev  |                    |  dmadev  |
+ *               ------------                    ------------
+ *                     |                              |
+ *            ------------------               ------------------
+ *            | HW-DMA-channel |               | HW-DMA-channel |
+ *            ------------------               ------------------
+ *                     |                              |
+ *                     --------------------------------
+ *                                     |
+ *                           ---------------------
+ *                           | HW-DMA-Controller |
+ *                           ---------------------
+ *
+ * The DMA controller could have multiple HW-DMA-channels (aka. HW-DMA-queues),
+ * each HW-DMA-channel should be represented by a dmadev.
+ *
+ * The dmadev could create multiple virtual DMA channels, each virtual DMA
+ * channel represents a different transfer context. The DMA operation request
+ * must be submitted to the virtual DMA channel. e.g. Application could create
+ * virtual DMA channel 0 for memory-to-memory transfer scenario, and create
+ * virtual DMA channel 1 for memory-to-device transfer scenario.
+ *
+ * The dmadev are dynamically allocated by rte_dmadev_pmd_allocate() during the
+ * PCI/SoC device probing phase performed at EAL initialization time. And could
+ * be released by rte_dmadev_pmd_release() during the PCI/SoC device removing
+ * phase.
+ *
+ * This framework uses 'uint16_t dev_id' as the device identifier of a dmadev,
+ * and 'uint16_t vchan' as the virtual DMA channel identifier in one dmadev.
+ *
+ * The functions exported by the dmadev API to setup a device designated by its
+ * device identifier must be invoked in the following order:
+ *     - rte_dmadev_configure()
+ *     - rte_dmadev_vchan_setup()
+ *     - rte_dmadev_start()
+ *
+ * Then, the application can invoke dataplane APIs to process jobs.
+ *
+ * If the application wants to change the configuration (i.e. invoke
+ * rte_dmadev_configure() or rte_dmadev_vchan_setup()), it must invoke
+ * rte_dmadev_stop() first to stop the device and then do the reconfiguration
+ * before invoking rte_dmadev_start() again. The dataplane APIs should not be
+ * invoked when the device is stopped.
+ *
+ * Finally, an application can close a dmadev by invoking the
+ * rte_dmadev_close() function.
+ *
+ * The dataplane APIs include two parts:
+ * The first part is the submission of operation requests:
+ *     - rte_dmadev_copy()
+ *     - rte_dmadev_copy_sg()
+ *     - rte_dmadev_fill()
+ *     - rte_dmadev_submit()
+ *
+ * These APIs could work with different virtual DMA channels which have
+ * different contexts.
+ *
+ * The first three APIs are used to submit the operation request to the virtual
+ * DMA channel, if the submission is successful, an uint16_t ring_idx is
+ * returned, otherwise a negative number is returned.
+ *
+ * The last API was used to issue doorbell to hardware, and also there are flags
+ * (@see RTE_DMA_OP_FLAG_SUBMIT) parameter of the first three APIs could do the
+ * same work.
+ *
+ * The second part is to obtain the result of requests:
+ *     - rte_dmadev_completed()
+ *         - return the number of operation requests completed successfully.
+ *     - rte_dmadev_completed_status()
+ *         - return the number of operation requests completed.
+ *
+ * @note The two completed APIs also support return the last completed
+ * operation's ring_idx.
+ * @note If the dmadev works in silent mode (@see RTE_DMADEV_CAPA_SILENT),
+ * application does not invoke the above two completed APIs.
+ *
+ * About the ring_idx which enqueue APIs (e.g. rte_dmadev_copy()
+ * rte_dmadev_fill()) returned, the rules are as follows:
+ *     - ring_idx for each virtual DMA channel are independent.
+ *     - For a virtual DMA channel, the ring_idx is monotonically incremented,
+ *       when it reach UINT16_MAX, it wraps back to zero.
+ *     - This ring_idx can be used by applications to track per-operation
+ *       metadata in an application-defined circular ring.
+ *     - The initial ring_idx of a virtual DMA channel is zero, after the
+ *       device is stopped, the ring_idx needs to be reset to zero.
+ *
+ * One example:
+ *     - step-1: start one dmadev
+ *     - step-2: enqueue a copy operation, the ring_idx return is 0
+ *     - step-3: enqueue a copy operation again, the ring_idx return is 1
+ *     - ...
+ *     - step-101: stop the dmadev
+ *     - step-102: start the dmadev
+ *     - step-103: enqueue a copy operation, the ring_idx return is 0
+ *     - ...
+ *     - step-x+0: enqueue a fill operation, the ring_idx return is 65535
+ *     - step-x+1: enqueue a copy operation, the ring_idx return is 0
+ *     - ...
+ *
+ * The DMA operation address used in enqueue APIs (i.e. rte_dmadev_copy(),
+ * rte_dmadev_copy_sg(), rte_dmadev_fill()) defined as rte_iova_t type. The
+ * dmadev supports two types of address: memory address and device address.
+ *
+ * - memory address: the source and destination address of the memory-to-memory
+ * transfer type, or the source address of the memory-to-device transfer type,
+ * or the destination address of the device-to-memory transfer type.
+ * @note If the device support SVA (@see RTE_DMADEV_CAPA_SVA), the memory
+ * address can be any VA address, otherwise it must be an IOVA address.
+ *
+ * - device address: the source and destination address of the device-to-device
+ * transfer type, or the source address of the device-to-memory transfer type,
+ * or the destination address of the memory-to-device transfer type.
+ *
+ * By default, all the functions of the dmadev API exported by a PMD are
+ * lock-free functions which assume to not be invoked in parallel on different
+ * logical cores to work on the same target dmadev object.
+ * @note Different virtual DMA channels on the same dmadev *DO NOT* support
+ * parallel invocation because these virtual DMA channels share the same
+ * HW-DMA-channel.
+ *
+ */
+
+#include <rte_common.h>
+#include <rte_compat.h>
+#include <rte_dev.h>
+#include <rte_errno.h>
+#include <rte_memory.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define RTE_DMADEV_NAME_MAX_LEN	RTE_DEV_NAME_MAX_LEN
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Get the device identifier for the named DMA device.
+ *
+ * @param name
+ *   DMA device name.
+ *
+ * @return
+ *   Returns DMA device identifier on success.
+ *   - <0: Failure to find named DMA device.
+ */
+__rte_experimental
+int
+rte_dmadev_get_dev_id(const char *name);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * @param dev_id
+ *   DMA device index.
+ *
+ * @return
+ *   - If the device index is valid (true) or not (false).
+ */
+__rte_experimental
+bool
+rte_dmadev_is_valid_dev(uint16_t dev_id);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Get the total number of DMA devices that have been successfully
+ * initialised.
+ *
+ * @return
+ *   The total number of usable DMA devices.
+ */
+__rte_experimental
+uint16_t
+rte_dmadev_count(void);
+
+/* Enumerates DMA device capabilities. */
+#define RTE_DMADEV_CAPA_MEM_TO_MEM	(1ull << 0)
+/**< DMA device support memory-to-memory transfer.
+ *
+ * @see struct rte_dmadev_info::dev_capa
+ */
+
+#define RTE_DMADEV_CAPA_MEM_TO_DEV	(1ull << 1)
+/**< DMA device support memory-to-device transfer.
+ *
+ * @see struct rte_dmadev_info::dev_capa
+ * @see struct rte_dmadev_port_param::port_type
+ */
+
+#define RTE_DMADEV_CAPA_DEV_TO_MEM	(1ull << 2)
+/**< DMA device support device-to-memory transfer.
+ *
+ * @see struct rte_dmadev_info::dev_capa
+ * @see struct rte_dmadev_port_param::port_type
+ */
+
+#define RTE_DMADEV_CAPA_DEV_TO_DEV	(1ull << 3)
+/**< DMA device support device-to-device transfer.
+ *
+ * @see struct rte_dmadev_info::dev_capa
+ * @see struct rte_dmadev_port_param::port_type
+ */
+
+#define RTE_DMADEV_CAPA_SVA		(1ull << 4)
+/**< DMA device support SVA which could use VA as DMA address.
+ * If device support SVA then application could pass any VA address like memory
+ * from rte_malloc(), rte_memzone(), malloc, stack memory.
+ * If device don't support SVA, then application should pass IOVA address which
+ * from rte_malloc(), rte_memzone().
+ *
+ * @see struct rte_dmadev_info::dev_capa
+ */
+
+#define RTE_DMADEV_CAPA_SILENT		(1ull << 5)
+/**< DMA device support work in silent mode.
+ * In this mode, application don't required to invoke rte_dmadev_completed*()
+ * API.
+ *
+ * @see struct rte_dmadev_conf::silent_mode
+ */
+
+#define RTE_DMADEV_CAPA_OPS_COPY	(1ull << 32)
+/**< DMA device support copy ops.
+ * This capability start with index of 32, so that it could leave gap between
+ * normal capability and ops capability.
+ *
+ * @see struct rte_dmadev_info::dev_capa
+ */
+
+#define RTE_DMADEV_CAPA_OPS_COPY_SG	(1ull << 33)
+/**< DMA device support scatter-gather list copy ops.
+ *
+ * @see struct rte_dmadev_info::dev_capa
+ */
+
+#define RTE_DMADEV_CAPA_OPS_FILL	(1ull << 34)
+/**< DMA device support fill ops.
+ *
+ * @see struct rte_dmadev_info::dev_capa
+ */
+
+/**
+ * A structure used to retrieve the information of a DMA device.
+ */
+struct rte_dmadev_info {
+	struct rte_device *device; /**< Generic Device information. */
+	uint64_t dev_capa; /**< Device capabilities (RTE_DMADEV_CAPA_*). */
+	uint16_t max_vchans;
+	/**< Maximum number of virtual DMA channels supported. */
+	uint16_t max_desc;
+	/**< Maximum allowed number of virtual DMA channel descriptors. */
+	uint16_t min_desc;
+	/**< Minimum allowed number of virtual DMA channel descriptors. */
+	uint16_t max_sges;
+	/**< Maximum number of source or destination scatter-gather entry
+	 * supported.
+	 * If the device does not support COPY_SG capability, this value can be
+	 * zero.
+	 * If the device supports COPY_SG capability, then rte_dmadev_copy_sg()
+	 * parameter nb_src/nb_dst should not exceed this value.
+	 */
+	uint16_t nb_vchans; /**< Number of virtual DMA channel configured. */
+};
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Retrieve information of a DMA device.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param[out] dev_info
+ *   A pointer to a structure of type *rte_dmadev_info* to be filled with the
+ *   information of the device.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int
+rte_dmadev_info_get(uint16_t dev_id, struct rte_dmadev_info *dev_info);
+
+/**
+ * A structure used to configure a DMA device.
+ */
+struct rte_dmadev_conf {
+	uint16_t nb_vchans;
+	/**< The number of virtual DMA channels to set up for the DMA device.
+	 * This value cannot be greater than the field 'max_vchans' of struct
+	 * rte_dmadev_info which get from rte_dmadev_info_get().
+	 */
+	bool enable_silent;
+	/**< Indicates whether to enable silent mode.
+	 * false-default mode, true-silent mode.
+	 * This value can be set to true only when the SILENT capability is
+	 * supported.
+	 *
+	 * @see RTE_DMADEV_CAPA_SILENT
+	 */
+};
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Configure a DMA device.
+ *
+ * This function must be invoked first before any other function in the
+ * API. This function can also be re-invoked when a device is in the
+ * stopped state.
+ *
+ * @param dev_id
+ *   The identifier of the device to configure.
+ * @param dev_conf
+ *   The DMA device configuration structure encapsulated into rte_dmadev_conf
+ *   object.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int
+rte_dmadev_configure(uint16_t dev_id, const struct rte_dmadev_conf *dev_conf);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Start a DMA device.
+ *
+ * The device start step is the last one and consists of setting the DMA
+ * to start accepting jobs.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int
+rte_dmadev_start(uint16_t dev_id);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Stop a DMA device.
+ *
+ * The device can be restarted with a call to rte_dmadev_start().
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int
+rte_dmadev_stop(uint16_t dev_id);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Close a DMA device.
+ *
+ * The device cannot be restarted after this call.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int
+rte_dmadev_close(uint16_t dev_id);
+
+/**
+ * rte_dma_direction - DMA transfer direction defines.
+ */
+enum rte_dma_direction {
+	RTE_DMA_DIR_MEM_TO_MEM,
+	/**< DMA transfer direction - from memory to memory.
+	 *
+	 * @see struct rte_dmadev_vchan_conf::direction
+	 */
+	RTE_DMA_DIR_MEM_TO_DEV,
+	/**< DMA transfer direction - from memory to device.
+	 * In a typical scenario, the SoCs are installed on host servers as
+	 * iNICs through the PCIe interface. In this case, the SoCs works in
+	 * EP(endpoint) mode, it could initiate a DMA move request from memory
+	 * (which is SoCs memory) to device (which is host memory).
+	 *
+	 * @see struct rte_dmadev_vchan_conf::direction
+	 */
+	RTE_DMA_DIR_DEV_TO_MEM,
+	/**< DMA transfer direction - from device to memory.
+	 * In a typical scenario, the SoCs are installed on host servers as
+	 * iNICs through the PCIe interface. In this case, the SoCs works in
+	 * EP(endpoint) mode, it could initiate a DMA move request from device
+	 * (which is host memory) to memory (which is SoCs memory).
+	 *
+	 * @see struct rte_dmadev_vchan_conf::direction
+	 */
+	RTE_DMA_DIR_DEV_TO_DEV,
+	/**< DMA transfer direction - from device to device.
+	 * In a typical scenario, the SoCs are installed on host servers as
+	 * iNICs through the PCIe interface. In this case, the SoCs works in
+	 * EP(endpoint) mode, it could initiate a DMA move request from device
+	 * (which is host memory) to the device (which is another host memory).
+	 *
+	 * @see struct rte_dmadev_vchan_conf::direction
+	 */
+};
+
+/**
+ * enum rte_dmadev_port_type - DMA access port type defines.
+ *
+ * @see struct rte_dmadev_port_param::port_type
+ */
+enum rte_dmadev_port_type {
+	RTE_DMADEV_PORT_NONE,
+	RTE_DMADEV_PORT_PCIE, /**< The DMA access port is PCIe. */
+};
+
+/**
+ * A structure used to descript DMA access port parameters.
+ *
+ * @see struct rte_dmadev_vchan_conf::src_port
+ * @see struct rte_dmadev_vchan_conf::dst_port
+ */
+struct rte_dmadev_port_param {
+	enum rte_dmadev_port_type port_type;
+	/**< The device access port type.
+	 * @see enum rte_dmadev_port_type
+	 */
+	union {
+		/** PCIe access port parameters.
+		 *
+		 * The following model shows SoC's PCIe module connects to
+		 * multiple PCIe hosts and multiple endpoints. The PCIe module
+		 * has an integrated DMA controller.
+		 *
+		 * If the DMA wants to access the memory of host A, it can be
+		 * initiated by PF1 in core0, or by VF0 of PF0 in core0.
+		 *
+		 * \code{.unparsed}
+		 * System Bus
+		 *    |     ----------PCIe module----------
+		 *    |     Bus
+		 *    |     Interface
+		 *    |     -----        ------------------
+		 *    |     |   |        | PCIe Core0     |
+		 *    |     |   |        |                |        -----------
+		 *    |     |   |        |   PF-0 -- VF-0 |        | Host A  |
+		 *    |     |   |--------|        |- VF-1 |--------| Root    |
+		 *    |     |   |        |   PF-1         |        | Complex |
+		 *    |     |   |        |   PF-2         |        -----------
+		 *    |     |   |        ------------------
+		 *    |     |   |
+		 *    |     |   |        ------------------
+		 *    |     |   |        | PCIe Core1     |
+		 *    |     |   |        |                |        -----------
+		 *    |     |   |        |   PF-0 -- VF-0 |        | Host B  |
+		 *    |-----|   |--------|   PF-1 -- VF-0 |--------| Root    |
+		 *    |     |   |        |        |- VF-1 |        | Complex |
+		 *    |     |   |        |   PF-2         |        -----------
+		 *    |     |   |        ------------------
+		 *    |     |   |
+		 *    |     |   |        ------------------
+		 *    |     |DMA|        |                |        ------
+		 *    |     |   |        |                |--------| EP |
+		 *    |     |   |--------| PCIe Core2     |        ------
+		 *    |     |   |        |                |        ------
+		 *    |     |   |        |                |--------| EP |
+		 *    |     |   |        |                |        ------
+		 *    |     -----        ------------------
+		 *
+		 * \endcode
+		 *
+		 * @note If some fields can not be supported by the
+		 * hardware/driver, then the driver ignores those fields.
+		 * Please check driver-specific documentation for limitations
+		 * and capablites.
+		 */
+		struct {
+			uint64_t coreid : 4; /**< PCIe core id used. */
+			uint64_t pfid : 8; /**< PF id used. */
+			uint64_t vfen : 1; /**< VF enable bit. */
+			uint64_t vfid : 16; /**< VF id used. */
+			uint64_t pasid : 20;
+			/**< The pasid filed in TLP packet. */
+			uint64_t attr : 3;
+			/**< The attributes filed in TLP packet. */
+			uint64_t ph : 2;
+			/**< The processing hint filed in TLP packet. */
+			uint64_t st : 16;
+			/**< The steering tag filed in TLP packet. */
+		} pcie;
+	};
+	uint64_t reserved[2]; /**< Reserved for future fields. */
+};
+
+/**
+ * A structure used to configure a virtual DMA channel.
+ */
+struct rte_dmadev_vchan_conf {
+	enum rte_dma_direction direction;
+	/**< Transfer direction
+	 * @see enum rte_dma_direction
+	 */
+	uint16_t nb_desc;
+	/**< Number of descriptor for the virtual DMA channel */
+	struct rte_dmadev_port_param src_port;
+	/**< 1) Used to describes the device access port parameter in the
+	 * device-to-memory transfer scenario.
+	 * 2) Used to describes the source device access port parameter in the
+	 * device-to-device transfer scenario.
+	 * @see struct rte_dmadev_port_param
+	 */
+	struct rte_dmadev_port_param dst_port;
+	/**< 1) Used to describes the device access port parameter in the
+	 * memory-to-device transfer scenario.
+	 * 2) Used to describes the destination device access port parameter in
+	 * the device-to-device transfer scenario.
+	 * @see struct rte_dmadev_port_param
+	 */
+};
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Allocate and set up a virtual DMA channel.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param vchan
+ *   The identifier of virtual DMA channel. The value must be in the range
+ *   [0, nb_vchans - 1] previously supplied to rte_dmadev_configure().
+ * @param conf
+ *   The virtual DMA channel configuration structure encapsulated into
+ *   rte_dmadev_vchan_conf object.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int
+rte_dmadev_vchan_setup(uint16_t dev_id, uint16_t vchan,
+		       const struct rte_dmadev_vchan_conf *conf);
+
+/**
+ * rte_dmadev_stats - running statistics.
+ */
+struct rte_dmadev_stats {
+	uint64_t submitted;
+	/**< Count of operations which were submitted to hardware. */
+	uint64_t completed;
+	/**< Count of operations which were completed. */
+	uint64_t errors;
+	/**< Count of operations which failed to complete. */
+};
+
+#define RTE_DMADEV_ALL_VCHAN	0xFFFFu
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Retrieve basic statistics of a or all virtual DMA channel(s).
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param vchan
+ *   The identifier of virtual DMA channel.
+ *   If equal RTE_DMADEV_ALL_VCHAN means all channels.
+ * @param[out] stats
+ *   The basic statistics structure encapsulated into rte_dmadev_stats
+ *   object.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int
+rte_dmadev_stats_get(uint16_t dev_id, uint16_t vchan,
+		     struct rte_dmadev_stats *stats);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Reset basic statistics of a or all virtual DMA channel(s).
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param vchan
+ *   The identifier of virtual DMA channel.
+ *   If equal RTE_DMADEV_ALL_VCHAN means all channels.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int
+rte_dmadev_stats_reset(uint16_t dev_id, uint16_t vchan);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Dump DMA device info.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param f
+ *   The file to write the output to.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int
+rte_dmadev_dump(uint16_t dev_id, FILE *f);
+
+/**
+ * rte_dma_status_code - DMA transfer result status code defines.
+ */
+enum rte_dma_status_code {
+	RTE_DMA_STATUS_SUCCESSFUL,
+	/**< The operation completed successfully. */
+	RTE_DMA_STATUS_USER_ABORT,
+	/**< The operation failed to complete due abort by user.
+	 * This is mainly used when processing dev_stop, user could modidy the
+	 * descriptors (e.g. change one bit to tell hardware abort this job),
+	 * it allows outstanding requests to be complete as much as possible,
+	 * so reduce the time to stop the device.
+	 */
+	RTE_DMA_STATUS_NOT_ATTEMPTED,
+	/**< The operation failed to complete due to following scenarios:
+	 * The jobs in a particular batch are not attempted because they
+	 * appeared after a fence where a previous job failed. In some HW
+	 * implementation it's possible for jobs from later batches would be
+	 * completed, though, so report the status from the not attempted jobs
+	 * before reporting those newer completed jobs.
+	 */
+	RTE_DMA_STATUS_INVALID_SRC_ADDR,
+	/**< The operation failed to complete due invalid source address. */
+	RTE_DMA_STATUS_INVALID_DST_ADDR,
+	/**< The operation failed to complete due invalid destination
+	 * address.
+	 */
+	RTE_DMA_STATUS_INVALID_ADDR,
+	/**< The operation failed to complete due invalid source or destination
+	 * address, cover the case that only knows the address error, but not
+	 * sure which address error.
+	 */
+	RTE_DMA_STATUS_INVALID_LENGTH,
+	/**< The operation failed to complete due invalid length. */
+	RTE_DMA_STATUS_INVALID_OPCODE,
+	/**< The operation failed to complete due invalid opcode.
+	 * The DMA descriptor could have multiple format, which are
+	 * distinguished by the opcode field.
+	 */
+	RTE_DMA_STATUS_BUS_READ_ERROR,
+	/**< The operation failed to complete due bus read error. */
+	RTE_DMA_STATUS_BUS_WRITE_ERROR,
+	/**< The operation failed to complete due bus write error. */
+	RTE_DMA_STATUS_BUS_ERROR,
+	/**< The operation failed to complete due bus error, cover the case that
+	 * only knows the bus error, but not sure which direction error.
+	 */
+	RTE_DMA_STATUS_DATA_POISION,
+	/**< The operation failed to complete due data poison. */
+	RTE_DMA_STATUS_DESCRIPTOR_READ_ERROR,
+	/**< The operation failed to complete due descriptor read error. */
+	RTE_DMA_STATUS_DEV_LINK_ERROR,
+	/**< The operation failed to complete due device link error.
+	 * Used to indicates that the link error in the memory-to-device/
+	 * device-to-memory/device-to-device transfer scenario.
+	 */
+	RTE_DMA_STATUS_PAGE_FAULT,
+	/**< The operation failed to complete due lookup page fault. */
+	RTE_DMA_STATUS_ERROR_UNKNOWN = 0x100,
+	/**< The operation failed to complete due unknown reason.
+	 * The initial value is 256, which reserves space for future errors.
+	 */
+};
+
+/**
+ * rte_dmadev_sge - can hold scatter-gather DMA operation request entry.
+ */
+struct rte_dmadev_sge {
+	rte_iova_t addr; /**< The DMA operation address. */
+	uint32_t length; /**< The DMA operation length. */
+};
+
+/* DMA flags to augment operation preparation. */
+#define RTE_DMA_OP_FLAG_FENCE	(1ull << 0)
+/**< DMA fence flag.
+ * It means the operation with this flag must be processed only after all
+ * previous operations are completed.
+ * If the specify DMA HW works in-order (it means it has default fence between
+ * operations), this flag could be NOP.
+ *
+ * @see rte_dmadev_copy()
+ * @see rte_dmadev_copy_sg()
+ * @see rte_dmadev_fill()
+ */
+
+#define RTE_DMA_OP_FLAG_SUBMIT	(1ull << 1)
+/**< DMA submit flag.
+ * It means the operation with this flag must issue doorbell to hardware after
+ * enqueued jobs.
+ */
+
+#define RTE_DMA_OP_FLAG_LLC	(1ull << 2)
+/**< DMA write data to low level cache hint.
+ * Used for performance optimization, this is just a hint, and there is no
+ * capability bit for this, driver should not return error if this flag was set.
+ */
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Enqueue a copy operation onto the virtual DMA channel.
+ *
+ * This queues up a copy operation to be performed by hardware, if the 'flags'
+ * parameter contains RTE_DMA_OP_FLAG_SUBMIT then trigger doorbell to begin
+ * this operation, otherwise do not trigger doorbell.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param vchan
+ *   The identifier of virtual DMA channel.
+ * @param src
+ *   The address of the source buffer.
+ * @param dst
+ *   The address of the destination buffer.
+ * @param length
+ *   The length of the data to be copied.
+ * @param flags
+ *   An flags for this operation.
+ *   @see RTE_DMA_OP_FLAG_*
+ *
+ * @return
+ *   - 0..UINT16_MAX: index of enqueued job.
+ *   - -ENOSPC: if no space left to enqueue.
+ *   - other values < 0 on failure.
+ */
+__rte_experimental
+int
+rte_dmadev_copy(uint16_t dev_id, uint16_t vchan, rte_iova_t src, rte_iova_t dst,
+		uint32_t length, uint64_t flags);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Enqueue a scatter-gather list copy operation onto the virtual DMA channel.
+ *
+ * This queues up a scatter-gather list copy operation to be performed by
+ * hardware, if the 'flags' parameter contains RTE_DMA_OP_FLAG_SUBMIT then
+ * trigger doorbell to begin this operation, otherwise do not trigger doorbell.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param vchan
+ *   The identifier of virtual DMA channel.
+ * @param src
+ *   The pointer of source scatter-gather entry array.
+ * @param dst
+ *   The pointer of destination scatter-gather entry array.
+ * @param nb_src
+ *   The number of source scatter-gather entry.
+ *   @see struct rte_dmadev_info::max_sges
+ * @param nb_dst
+ *   The number of destination scatter-gather entry.
+ *   @see struct rte_dmadev_info::max_sges
+ * @param flags
+ *   An flags for this operation.
+ *   @see RTE_DMA_OP_FLAG_*
+ *
+ * @return
+ *   - 0..UINT16_MAX: index of enqueued job.
+ *   - -ENOSPC: if no space left to enqueue.
+ *   - other values < 0 on failure.
+ */
+__rte_experimental
+int
+rte_dmadev_copy_sg(uint16_t dev_id, uint16_t vchan, struct rte_dmadev_sge *src,
+		   struct rte_dmadev_sge *dst, uint16_t nb_src, uint16_t nb_dst,
+		   uint64_t flags);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Enqueue a fill operation onto the virtual DMA channel.
+ *
+ * This queues up a fill operation to be performed by hardware, if the 'flags'
+ * parameter contains RTE_DMA_OP_FLAG_SUBMIT then trigger doorbell to begin
+ * this operation, otherwise do not trigger doorbell.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param vchan
+ *   The identifier of virtual DMA channel.
+ * @param pattern
+ *   The pattern to populate the destination buffer with.
+ * @param dst
+ *   The address of the destination buffer.
+ * @param length
+ *   The length of the destination buffer.
+ * @param flags
+ *   An flags for this operation.
+ *   @see RTE_DMA_OP_FLAG_*
+ *
+ * @return
+ *   - 0..UINT16_MAX: index of enqueued job.
+ *   - -ENOSPC: if no space left to enqueue.
+ *   - other values < 0 on failure.
+ */
+__rte_experimental
+int
+rte_dmadev_fill(uint16_t dev_id, uint16_t vchan, uint64_t pattern,
+		rte_iova_t dst, uint32_t length, uint64_t flags);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Trigger hardware to begin performing enqueued operations.
+ *
+ * This API is used to write the "doorbell" to the hardware to trigger it
+ * to begin the operations previously enqueued by rte_dmadev_copy/fill().
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param vchan
+ *   The identifier of virtual DMA channel.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int
+rte_dmadev_submit(uint16_t dev_id, uint16_t vchan);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Returns the number of operations that have been successfully completed.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param vchan
+ *   The identifier of virtual DMA channel.
+ * @param nb_cpls
+ *   The maximum number of completed operations that can be processed.
+ * @param[out] last_idx
+ *   The last completed operation's ring_idx.
+ *   If not required, NULL can be passed in.
+ * @param[out] has_error
+ *   Indicates if there are transfer error.
+ *   If not required, NULL can be passed in.
+ *
+ * @return
+ *   The number of operations that successfully completed. This return value
+ *   must be less than or equal to the value of nb_cpls.
+ */
+__rte_experimental
+uint16_t
+rte_dmadev_completed(uint16_t dev_id, uint16_t vchan, const uint16_t nb_cpls,
+		     uint16_t *last_idx, bool *has_error);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Returns the number of operations that have been completed, and the
+ * operations result may succeed or fail.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ * @param vchan
+ *   The identifier of virtual DMA channel.
+ * @param nb_cpls
+ *   Indicates the size of status array.
+ * @param[out] last_idx
+ *   The last completed operation's ring_idx.
+ *   If not required, NULL can be passed in.
+ * @param[out] status
+ *   This is a pointer to an array of length 'nb_cpls' that holds the completion
+ *   status code of each operation.
+ *   @see enum rte_dma_status_code
+ *
+ * @return
+ *   The number of operations that completed. This return value must be less
+ *   than or equal to the value of nb_cpls.
+ *   If this number is greater than zero (assuming n), then n values in the
+ *   status array are also set.
+ */
+__rte_experimental
+uint16_t
+rte_dmadev_completed_status(uint16_t dev_id, uint16_t vchan,
+			    const uint16_t nb_cpls, uint16_t *last_idx,
+			    enum rte_dma_status_code *status);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_DMADEV_H_ */
diff --git a/lib/dmadev/version.map b/lib/dmadev/version.map
new file mode 100644
index 0000000..2e37882
--- /dev/null
+++ b/lib/dmadev/version.map
@@ -0,0 +1,24 @@
+EXPERIMENTAL {
+	global:
+
+	rte_dmadev_close;
+	rte_dmadev_completed;
+	rte_dmadev_completed_status;
+	rte_dmadev_configure;
+	rte_dmadev_copy;
+	rte_dmadev_copy_sg;
+	rte_dmadev_count;
+	rte_dmadev_dump;
+	rte_dmadev_fill;
+	rte_dmadev_get_dev_id;
+	rte_dmadev_info_get;
+	rte_dmadev_is_valid_dev;
+	rte_dmadev_start;
+	rte_dmadev_stats_get;
+	rte_dmadev_stats_reset;
+	rte_dmadev_stop;
+	rte_dmadev_submit;
+	rte_dmadev_vchan_setup;
+
+	local: *;
+};
diff --git a/lib/meson.build b/lib/meson.build
index 1673ca4..a542c23 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -44,6 +44,7 @@ libraries = [
         'power',
         'pdump',
         'rawdev',
+        'dmadev',
         'regexdev',
         'rib',
         'reorder',
-- 
2.8.1