diff mbox series

[v22,4/5] dma/skeleton: introduce skeleton dmadev driver

Message ID 20210916034145.51561-5-fengchengwen@huawei.com (mailing list archive)
State Superseded
Delegated to: Thomas Monjalon
Headers show
Series support dmadev | expand

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

fengchengwen Sept. 16, 2021, 3:41 a.m. UTC
Skeleton dmadevice driver, on the lines of rawdev skeleton, is for
showcasing of the dmadev library.

Design of skeleton involves a virtual device which is plugged into VDEV
bus on initialization.

Also, enable compilation of dmadev skeleton drivers.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Reviewed-by: Kevin Laatz <kevin.laatz@intel.com>
Reviewed-by: Conor Walsh <conor.walsh@intel.com>
---
 MAINTAINERS                            |   1 +
 drivers/dma/meson.build                |   4 +-
 drivers/dma/skeleton/meson.build       |   7 +
 drivers/dma/skeleton/skeleton_dmadev.c | 571 +++++++++++++++++++++++++
 drivers/dma/skeleton/skeleton_dmadev.h |  61 +++
 drivers/dma/skeleton/version.map       |   3 +
 6 files changed, 646 insertions(+), 1 deletion(-)
 create mode 100644 drivers/dma/skeleton/meson.build
 create mode 100644 drivers/dma/skeleton/skeleton_dmadev.c
 create mode 100644 drivers/dma/skeleton/skeleton_dmadev.h
 create mode 100644 drivers/dma/skeleton/version.map
diff mbox series

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index 8af9522a5a..418f775382 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -455,6 +455,7 @@  F: doc/guides/regexdevs/features/default.ini
 DMA device API - EXPERIMENTAL
 M: Chengwen Feng <fengchengwen@huawei.com>
 F: lib/dmadev/
+F: drivers/dma/skeleton/
 F: doc/guides/prog_guide/dmadev.rst
 
 Eventdev API
diff --git a/drivers/dma/meson.build b/drivers/dma/meson.build
index a24c56d8ff..d9c7ede32f 100644
--- a/drivers/dma/meson.build
+++ b/drivers/dma/meson.build
@@ -1,4 +1,6 @@ 
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright 2021 HiSilicon Limited
 
-drivers = []
+drivers = [
+        'skeleton',
+]
diff --git a/drivers/dma/skeleton/meson.build b/drivers/dma/skeleton/meson.build
new file mode 100644
index 0000000000..8871b80956
--- /dev/null
+++ b/drivers/dma/skeleton/meson.build
@@ -0,0 +1,7 @@ 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2021 HiSilicon Limited
+
+deps += ['dmadev', 'kvargs', 'ring', 'bus_vdev']
+sources = files(
+        'skeleton_dmadev.c',
+)
diff --git a/drivers/dma/skeleton/skeleton_dmadev.c b/drivers/dma/skeleton/skeleton_dmadev.c
new file mode 100644
index 0000000000..876878bb78
--- /dev/null
+++ b/drivers/dma/skeleton/skeleton_dmadev.c
@@ -0,0 +1,571 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2021 HiSilicon Limited
+ */
+
+#include <inttypes.h>
+
+#include <rte_bus_vdev.h>
+#include <rte_cycles.h>
+#include <rte_eal.h>
+#include <rte_kvargs.h>
+#include <rte_lcore.h>
+#include <rte_log.h>
+#include <rte_malloc.h>
+#include <rte_memcpy.h>
+
+#include <rte_dmadev_pmd.h>
+
+#include "skeleton_dmadev.h"
+
+RTE_LOG_REGISTER_DEFAULT(skeldma_logtype, INFO);
+#define SKELDMA_LOG(level, fmt, args...) \
+	rte_log(RTE_LOG_ ## level, skeldma_logtype, "%s(): " fmt "\n", \
+		__func__, ##args)
+
+/* Count of instances, currently only 1 is supported. */
+static uint16_t skeldma_count;
+
+static int
+skeldma_info_get(const struct rte_dma_dev *dev, struct rte_dma_info *dev_info,
+		 uint32_t info_sz)
+{
+#define SKELDMA_MAX_DESC	8192
+#define SKELDMA_MIN_DESC	32
+
+	RTE_SET_USED(dev);
+	RTE_SET_USED(info_sz);
+
+	dev_info->dev_capa = RTE_DMA_CAPA_MEM_TO_MEM |
+			     RTE_DMA_CAPA_SVA |
+			     RTE_DMA_CAPA_OPS_COPY;
+	dev_info->max_vchans = 1;
+	dev_info->max_desc = SKELDMA_MAX_DESC;
+	dev_info->min_desc = SKELDMA_MIN_DESC;
+
+	return 0;
+}
+
+static int
+skeldma_configure(struct rte_dma_dev *dev, const struct rte_dma_conf *conf,
+		  uint32_t conf_sz)
+{
+	RTE_SET_USED(dev);
+	RTE_SET_USED(conf);
+	RTE_SET_USED(conf_sz);
+	return 0;
+}
+
+static void *
+cpucopy_thread(void *param)
+{
+#define SLEEP_THRESHOLD		10000
+#define SLEEP_US_VAL		10
+
+	struct rte_dma_dev *dev = param;
+	struct skeldma_hw *hw = dev->dev_private;
+	struct skeldma_desc *desc = NULL;
+	int ret;
+
+	while (!hw->exit_flag) {
+		ret = rte_ring_dequeue(hw->desc_running, (void **)&desc);
+		if (ret) {
+			hw->zero_req_count++;
+			if (hw->zero_req_count > SLEEP_THRESHOLD) {
+				if (hw->zero_req_count == 0)
+					hw->zero_req_count = SLEEP_THRESHOLD;
+				rte_delay_us_sleep(SLEEP_US_VAL);
+			}
+			continue;
+		}
+
+		hw->zero_req_count = 0;
+		rte_memcpy(desc->dst, desc->src, desc->len);
+		hw->completed_count++;
+		(void)rte_ring_enqueue(hw->desc_completed, (void *)desc);
+	}
+
+	return NULL;
+}
+
+static void
+fflush_ring(struct skeldma_hw *hw, struct rte_ring *ring)
+{
+	struct skeldma_desc *desc = NULL;
+	while (rte_ring_count(ring) > 0) {
+		(void)rte_ring_dequeue(ring, (void **)&desc);
+		(void)rte_ring_enqueue(hw->desc_empty, (void *)desc);
+	}
+}
+
+static int
+skeldma_start(struct rte_dma_dev *dev)
+{
+	struct skeldma_hw *hw = dev->dev_private;
+	rte_cpuset_t cpuset;
+	int ret;
+
+	if (hw->desc_mem == NULL) {
+		SKELDMA_LOG(ERR, "Vchan was not setup, start fail!");
+		return -EINVAL;
+	}
+
+	/* Reset the dmadev to a known state, include:
+	 * 1) fflush pending/running/completed ring to empty ring.
+	 * 2) init ring idx to zero.
+	 * 3) init running statistics.
+	 * 4) mark cpucopy task exit_flag to false.
+	 */
+	fflush_ring(hw, hw->desc_pending);
+	fflush_ring(hw, hw->desc_running);
+	fflush_ring(hw, hw->desc_completed);
+	hw->ridx = 0;
+	hw->submitted_count = 0;
+	hw->zero_req_count = 0;
+	hw->completed_count = 0;
+	hw->exit_flag = false;
+
+	rte_mb();
+
+	ret = rte_ctrl_thread_create(&hw->thread, "dma_skeleton", NULL,
+				     cpucopy_thread, dev);
+	if (ret) {
+		SKELDMA_LOG(ERR, "Start cpucopy thread fail!");
+		return -EINVAL;
+	}
+
+	if (hw->lcore_id != -1) {
+		cpuset = rte_lcore_cpuset(hw->lcore_id);
+		ret = pthread_setaffinity_np(hw->thread, sizeof(cpuset),
+					     &cpuset);
+		if (ret)
+			SKELDMA_LOG(WARNING,
+				"Set thread affinity lcore = %d fail!",
+				hw->lcore_id);
+	}
+
+	return 0;
+}
+
+static int
+skeldma_stop(struct rte_dma_dev *dev)
+{
+	struct skeldma_hw *hw = dev->dev_private;
+
+	hw->exit_flag = true;
+	rte_delay_ms(1);
+
+	pthread_cancel(hw->thread);
+	pthread_join(hw->thread, NULL);
+
+	return 0;
+}
+
+static int
+vchan_setup(struct skeldma_hw *hw, uint16_t nb_desc)
+{
+	struct skeldma_desc *desc;
+	struct rte_ring *empty;
+	struct rte_ring *pending;
+	struct rte_ring *running;
+	struct rte_ring *completed;
+	uint16_t i;
+
+	desc = rte_zmalloc_socket("dma_skelteon_desc",
+				  nb_desc * sizeof(struct skeldma_desc),
+				  RTE_CACHE_LINE_SIZE, hw->socket_id);
+	if (desc == NULL) {
+		SKELDMA_LOG(ERR, "Malloc dma skeleton desc fail!");
+		return -ENOMEM;
+	}
+
+	empty = rte_ring_create("dma_skeleton_desc_empty", nb_desc,
+				hw->socket_id, RING_F_SP_ENQ | RING_F_SC_DEQ);
+	pending = rte_ring_create("dma_skeleton_desc_pending", nb_desc,
+				  hw->socket_id, RING_F_SP_ENQ | RING_F_SC_DEQ);
+	running = rte_ring_create("dma_skeleton_desc_running", nb_desc,
+				  hw->socket_id, RING_F_SP_ENQ | RING_F_SC_DEQ);
+	completed = rte_ring_create("dma_skeleton_desc_completed", nb_desc,
+				  hw->socket_id, RING_F_SP_ENQ | RING_F_SC_DEQ);
+	if (empty == NULL || pending == NULL || running == NULL ||
+	    completed == NULL) {
+		SKELDMA_LOG(ERR, "Create dma skeleton desc ring fail!");
+		rte_ring_free(empty);
+		rte_ring_free(pending);
+		rte_ring_free(running);
+		rte_ring_free(completed);
+		rte_free(desc);
+		return -ENOMEM;
+	}
+
+	/* The real usable ring size is *count-1* instead of *count* to
+	 * differentiate a free ring from an empty ring.
+	 * @see rte_ring_create
+	 */
+	for (i = 0; i < nb_desc - 1; i++)
+		(void)rte_ring_enqueue(empty, (void *)(desc + i));
+
+	hw->desc_mem = desc;
+	hw->desc_empty = empty;
+	hw->desc_pending = pending;
+	hw->desc_running = running;
+	hw->desc_completed = completed;
+
+	return 0;
+}
+
+static void
+vchan_release(struct skeldma_hw *hw)
+{
+	if (hw->desc_mem == NULL)
+		return;
+
+	rte_free(hw->desc_mem);
+	hw->desc_mem = NULL;
+	rte_ring_free(hw->desc_empty);
+	hw->desc_empty = NULL;
+	rte_ring_free(hw->desc_pending);
+	hw->desc_pending = NULL;
+	rte_ring_free(hw->desc_running);
+	hw->desc_running = NULL;
+	rte_ring_free(hw->desc_completed);
+	hw->desc_completed = NULL;
+}
+
+static int
+skeldma_close(struct rte_dma_dev *dev)
+{
+	/* The device already stopped */
+	vchan_release(dev->dev_private);
+	return 0;
+}
+
+static int
+skeldma_vchan_setup(struct rte_dma_dev *dev, uint16_t vchan,
+		    const struct rte_dma_vchan_conf *conf,
+		    uint32_t conf_sz)
+{
+	struct skeldma_hw *hw = dev->dev_private;
+
+	RTE_SET_USED(vchan);
+	RTE_SET_USED(conf_sz);
+
+	if (!rte_is_power_of_2(conf->nb_desc)) {
+		SKELDMA_LOG(ERR, "Number of desc must be power of 2!");
+		return -EINVAL;
+	}
+
+	vchan_release(hw);
+	return vchan_setup(hw, conf->nb_desc);
+}
+
+static int
+skeldma_stats_get(const struct rte_dma_dev *dev, uint16_t vchan,
+		  struct rte_dma_stats *stats, uint32_t stats_sz)
+{
+	struct skeldma_hw *hw = dev->dev_private;
+
+	RTE_SET_USED(vchan);
+	RTE_SET_USED(stats_sz);
+
+	stats->submitted = hw->submitted_count;
+	stats->completed = hw->completed_count;
+	stats->errors = 0;
+
+	return 0;
+}
+
+static int
+skeldma_stats_reset(struct rte_dma_dev *dev, uint16_t vchan)
+{
+	struct skeldma_hw *hw = dev->dev_private;
+
+	RTE_SET_USED(vchan);
+
+	hw->submitted_count = 0;
+	hw->completed_count = 0;
+
+	return 0;
+}
+
+static int
+skeldma_dump(const struct rte_dma_dev *dev, FILE *f)
+{
+#define GET_RING_COUNT(ring)	((ring) ? (rte_ring_count(ring)) : 0)
+
+	struct skeldma_hw *hw = dev->dev_private;
+
+	fprintf(f,
+		"    lcore_id: %d\n"
+		"    socket_id: %d\n"
+		"    desc_empty_ring_count: %u\n"
+		"    desc_pending_ring_count: %u\n"
+		"    desc_running_ring_count: %u\n"
+		"    desc_completed_ring_count: %u\n",
+		hw->lcore_id, hw->socket_id,
+		GET_RING_COUNT(hw->desc_empty),
+		GET_RING_COUNT(hw->desc_pending),
+		GET_RING_COUNT(hw->desc_running),
+		GET_RING_COUNT(hw->desc_completed));
+	fprintf(f,
+		"    next_ring_idx: %u\n"
+		"    submitted_count: %" PRIu64 "\n"
+		"    completed_count: %" PRIu64 "\n",
+		hw->ridx, hw->submitted_count, hw->completed_count);
+
+	return 0;
+}
+
+static inline void
+submit(struct skeldma_hw *hw, struct skeldma_desc *desc)
+{
+	uint16_t count = rte_ring_count(hw->desc_pending);
+	struct skeldma_desc *pend_desc = NULL;
+
+	while (count > 0) {
+		(void)rte_ring_dequeue(hw->desc_pending, (void **)&pend_desc);
+		(void)rte_ring_enqueue(hw->desc_running, (void *)pend_desc);
+		count--;
+	}
+
+	if (desc)
+		(void)rte_ring_enqueue(hw->desc_running, (void *)desc);
+}
+
+static int
+skeldma_copy(struct rte_dma_dev *dev, uint16_t vchan,
+	     rte_iova_t src, rte_iova_t dst,
+	     uint32_t length, uint64_t flags)
+{
+	struct skeldma_hw *hw = dev->dev_private;
+	struct skeldma_desc *desc;
+	int ret;
+
+	RTE_SET_USED(vchan);
+	RTE_SET_USED(flags);
+
+	ret = rte_ring_dequeue(hw->desc_empty, (void **)&desc);
+	if (ret)
+		return -ENOSPC;
+	desc->src = (void *)(uintptr_t)src;
+	desc->dst = (void *)(uintptr_t)dst;
+	desc->len = length;
+	desc->ridx = hw->ridx;
+	if (flags & RTE_DMA_OP_FLAG_SUBMIT)
+		submit(hw, desc);
+	else
+		(void)rte_ring_enqueue(hw->desc_pending, (void *)desc);
+	hw->submitted_count++;
+
+	return hw->ridx++;
+}
+
+static int
+skeldma_submit(struct rte_dma_dev *dev, uint16_t vchan)
+{
+	struct skeldma_hw *hw = dev->dev_private;
+	RTE_SET_USED(vchan);
+	submit(hw, NULL);
+	return 0;
+}
+
+static uint16_t
+skeldma_completed(struct rte_dma_dev *dev,
+		  uint16_t vchan, const uint16_t nb_cpls,
+		  uint16_t *last_idx, bool *has_error)
+{
+	struct skeldma_hw *hw = dev->dev_private;
+	struct skeldma_desc *desc = NULL;
+	uint16_t index = 0;
+	uint16_t count;
+
+	RTE_SET_USED(vchan);
+	RTE_SET_USED(has_error);
+
+	count = RTE_MIN(nb_cpls, rte_ring_count(hw->desc_completed));
+	while (index < count) {
+		(void)rte_ring_dequeue(hw->desc_completed, (void **)&desc);
+		if (index == count - 1)
+			*last_idx = desc->ridx;
+		index++;
+		(void)rte_ring_enqueue(hw->desc_empty, (void *)desc);
+	}
+
+	return count;
+}
+
+static uint16_t
+skeldma_completed_status(struct rte_dma_dev *dev,
+			 uint16_t vchan, const uint16_t nb_cpls,
+			 uint16_t *last_idx, enum rte_dma_status_code *status)
+{
+	struct skeldma_hw *hw = dev->dev_private;
+	struct skeldma_desc *desc = NULL;
+	uint16_t index = 0;
+	uint16_t count;
+
+	RTE_SET_USED(vchan);
+
+	count = RTE_MIN(nb_cpls, rte_ring_count(hw->desc_completed));
+	while (index < count) {
+		(void)rte_ring_dequeue(hw->desc_completed, (void **)&desc);
+		if (index == count - 1)
+			*last_idx = desc->ridx;
+		status[index++] = RTE_DMA_STATUS_SUCCESSFUL;
+		(void)rte_ring_enqueue(hw->desc_empty, (void *)desc);
+	}
+
+	return count;
+}
+
+static const struct rte_dma_dev_ops skeldma_ops = {
+	.dev_info_get  = skeldma_info_get,
+	.dev_configure = skeldma_configure,
+	.dev_start     = skeldma_start,
+	.dev_stop      = skeldma_stop,
+	.dev_close     = skeldma_close,
+
+	.vchan_setup   = skeldma_vchan_setup,
+
+	.stats_get     = skeldma_stats_get,
+	.stats_reset   = skeldma_stats_reset,
+
+	.dev_dump      = skeldma_dump,
+};
+
+static int
+skeldma_create(const char *name, struct rte_vdev_device *vdev, int lcore_id)
+{
+	struct rte_dma_dev *dev;
+	struct skeldma_hw *hw;
+	int socket_id;
+
+	socket_id = (lcore_id < 0) ? rte_socket_id() :
+				     rte_lcore_to_socket_id(lcore_id);
+	dev = rte_dma_pmd_allocate(name, socket_id, sizeof(struct skeldma_hw));
+	if (dev == NULL) {
+		SKELDMA_LOG(ERR, "Unable to allocate dmadev: %s", name);
+		return -EINVAL;
+	}
+
+	dev->copy = skeldma_copy;
+	dev->submit = skeldma_submit;
+	dev->completed = skeldma_completed;
+	dev->completed_status = skeldma_completed_status;
+	dev->dev_ops = &skeldma_ops;
+	dev->device = &vdev->device;
+
+	hw = dev->dev_private;
+	hw->lcore_id = lcore_id;
+	hw->socket_id = socket_id;
+
+	dev->state = RTE_DMA_DEV_READY;
+
+	return dev->data->dev_id;
+}
+
+static int
+skeldma_destroy(const char *name)
+{
+	return rte_dma_pmd_release(name);
+}
+
+static int
+skeldma_parse_lcore(const char *key __rte_unused,
+		    const char *value,
+		    void *opaque)
+{
+	int lcore_id = atoi(value);
+	if (lcore_id >= 0 && lcore_id < RTE_MAX_LCORE)
+		*(int *)opaque = lcore_id;
+	return 0;
+}
+
+static void
+skeldma_parse_vdev_args(struct rte_vdev_device *vdev, int *lcore_id)
+{
+	static const char *const args[] = {
+		SKELDMA_ARG_LCORE,
+		NULL
+	};
+
+	struct rte_kvargs *kvlist;
+	const char *params;
+
+	params = rte_vdev_device_args(vdev);
+	if (params == NULL || params[0] == '\0')
+		return;
+
+	kvlist = rte_kvargs_parse(params, args);
+	if (!kvlist)
+		return;
+
+	(void)rte_kvargs_process(kvlist, SKELDMA_ARG_LCORE,
+				 skeldma_parse_lcore, lcore_id);
+	SKELDMA_LOG(INFO, "Parse lcore_id = %d", *lcore_id);
+
+	rte_kvargs_free(kvlist);
+}
+
+static int
+skeldma_probe(struct rte_vdev_device *vdev)
+{
+	const char *name;
+	int lcore_id = -1;
+	int ret;
+
+	name = rte_vdev_device_name(vdev);
+	if (name == NULL)
+		return -EINVAL;
+
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
+		SKELDMA_LOG(ERR, "Multiple process not supported for %s", name);
+		return -EINVAL;
+	}
+
+	/* More than one instance is not supported */
+	if (skeldma_count > 0) {
+		SKELDMA_LOG(ERR, "Multiple instance not supported for %s",
+			name);
+		return -EINVAL;
+	}
+
+	skeldma_parse_vdev_args(vdev, &lcore_id);
+
+	ret = skeldma_create(name, vdev, lcore_id);
+	if (ret >= 0) {
+		SKELDMA_LOG(INFO, "Create %s dmadev with lcore-id %d",
+			name, lcore_id);
+		skeldma_count = 1;
+	}
+
+	return ret < 0 ? ret : 0;
+}
+
+static int
+skeldma_remove(struct rte_vdev_device *vdev)
+{
+	const char *name;
+	int ret;
+
+	name = rte_vdev_device_name(vdev);
+	if (name == NULL)
+		return -1;
+
+	ret = skeldma_destroy(name);
+	if (!ret) {
+		skeldma_count = 0;
+		SKELDMA_LOG(INFO, "Remove %s dmadev", name);
+	}
+
+	return ret;
+}
+
+static struct rte_vdev_driver skeldma_pmd_drv = {
+	.probe = skeldma_probe,
+	.remove = skeldma_remove,
+	.drv_flags = RTE_VDEV_DRV_NEED_IOVA_AS_VA,
+};
+
+RTE_PMD_REGISTER_VDEV(dma_skeleton, skeldma_pmd_drv);
+RTE_PMD_REGISTER_PARAM_STRING(dma_skeleton,
+		SKELDMA_ARG_LCORE "=<uint16> ");
diff --git a/drivers/dma/skeleton/skeleton_dmadev.h b/drivers/dma/skeleton/skeleton_dmadev.h
new file mode 100644
index 0000000000..eaa52364bf
--- /dev/null
+++ b/drivers/dma/skeleton/skeleton_dmadev.h
@@ -0,0 +1,61 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2021 HiSilicon Limited
+ */
+
+#ifndef SKELETON_DMADEV_H
+#define SKELETON_DMADEV_H
+
+#include <pthread.h>
+
+#include <rte_ring.h>
+
+#define SKELDMA_ARG_LCORE	"lcore"
+
+struct skeldma_desc {
+	void *src;
+	void *dst;
+	uint32_t len;
+	uint16_t ridx; /* ring idx */
+};
+
+struct skeldma_hw {
+	int lcore_id; /* cpucopy task affinity core */
+	int socket_id;
+	pthread_t thread; /* cpucopy task thread */
+	volatile int exit_flag; /* cpucopy task exit flag */
+
+	struct skeldma_desc *desc_mem;
+
+	/* Descriptor ring state machine:
+	 *
+	 *  -----------     enqueue without submit     -----------
+	 *  |  empty  |------------------------------->| pending |
+	 *  -----------\                               -----------
+	 *       ^      \------------                       |
+	 *       |                  |                       |submit doorbell
+	 *       |                  |                       |
+	 *       |                  |enqueue with submit    |
+	 *       |get completed     |------------------|    |
+	 *       |                                     |    |
+	 *       |                                     v    v
+	 *  -----------     cpucopy thread working     -----------
+	 *  |completed|<-------------------------------| running |
+	 *  -----------                                -----------
+	 */
+	struct rte_ring *desc_empty;
+	struct rte_ring *desc_pending;
+	struct rte_ring *desc_running;
+	struct rte_ring *desc_completed;
+
+	/* Cache delimiter for dataplane API's operation data */
+	char cache1 __rte_cache_aligned;
+	uint16_t ridx;  /* ring idx */
+	uint64_t submitted_count;
+
+	/* Cache delimiter for cpucopy thread's operation data */
+	char cache2 __rte_cache_aligned;
+	uint32_t zero_req_count;
+	uint64_t completed_count;
+};
+
+#endif /* SKELETON_DMADEV_H */
diff --git a/drivers/dma/skeleton/version.map b/drivers/dma/skeleton/version.map
new file mode 100644
index 0000000000..c2e0723b4c
--- /dev/null
+++ b/drivers/dma/skeleton/version.map
@@ -0,0 +1,3 @@ 
+DPDK_22 {
+	local: *;
+};