The 'dmadev' is a generic type of DMA device.
This patch introduce the 'dmadev' device allocation functions.
The infrastructure is prepared to welcome drivers in drivers/dma/
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 <jerinj@marvell.com>
Reviewed-by: Kevin Laatz <kevin.laatz@intel.com>
Reviewed-by: Conor Walsh <conor.walsh@intel.com>
F: doc/guides/prog_guide/regexdev.rst
F: doc/guides/regexdevs/features/default.ini
+DMA device API - EXPERIMENTAL
+M: Chengwen Feng <fengchengwen@huawei.com>
+F: lib/dmadev/
+F: doc/guides/prog_guide/dmadev.rst
+
Eventdev API
M: Jerin Jacob <jerinj@marvell.com>
T: git://dpdk.org/next/dpdk-next-eventdev
[compressdev] (@ref rte_compressdev.h),
[compress] (@ref rte_comp.h),
[regexdev] (@ref rte_regexdev.h),
+ [dmadev] (@ref rte_dmadev.h),
[eventdev] (@ref rte_eventdev.h),
[event_eth_rx_adapter] (@ref rte_event_eth_rx_adapter.h),
[event_eth_tx_adapter] (@ref rte_event_eth_tx_adapter.h),
@TOPDIR@/lib/compressdev \
@TOPDIR@/lib/cryptodev \
@TOPDIR@/lib/distributor \
+ @TOPDIR@/lib/dmadev \
@TOPDIR@/lib/efd \
@TOPDIR@/lib/ethdev \
@TOPDIR@/lib/eventdev \
--- /dev/null
+.. SPDX-License-Identifier: BSD-3-Clause
+ Copyright 2021 HiSilicon Limited
+
+DMA Device Drivers
+==================
+
+The following are a list of DMA device drivers, which can be used from
+an application through DMA API.
+
+.. toctree::
+ :maxdepth: 2
+ :numbered:
compressdevs/index
vdpadevs/index
regexdevs/index
+ dmadevs/index
eventdevs/index
rawdevs/index
mempool/index
--- /dev/null
+.. SPDX-License-Identifier: BSD-3-Clause
+ Copyright 2021 HiSilicon Limited
+
+DMA Device Library
+==================
+
+The DMA library provides a DMA device framework for management and provisioning
+of hardware and software DMA poll mode drivers, defining generic API which
+support a number of different DMA operations.
+
+
+Design Principles
+-----------------
+
+The DMA framework provides a generic DMA device framework which supports both
+physical (hardware) and virtual (software) DMA devices, as well as a generic DMA
+API which allows DMA devices to be managed and configured, and supports DMA
+operations to be provisioned on DMA poll mode driver.
+
+.. _figure_dmadev:
+
+.. figure:: img/dmadev.*
+
+The above figure shows the model on which the DMA framework is built on:
+
+ * The DMA controller could have multiple hardware DMA channels (aka. hardware
+ DMA queues), each hardware 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.
+
+
+Device Management
+-----------------
+
+Device Creation
+~~~~~~~~~~~~~~~
+
+Physical DMA controllers are discovered during the PCI probe/enumeration of the
+EAL function which is executed at DPDK initialization, this is based on their
+PCI BDF (bus/bridge, device, function). Specific physical DMA controllers, like
+other physical devices in DPDK can be listed using the EAL command line options.
+
+The dmadevs are dynamically allocated by using the function
+``rte_dma_pmd_allocate`` based on the number of hardware DMA channels.
+
+
+Device Identification
+~~~~~~~~~~~~~~~~~~~~~
+
+Each DMA device, whether physical or virtual is uniquely designated by two
+identifiers:
+
+- A unique device index used to designate the DMA device in all functions
+ exported by the DMA API.
+
+- A device name used to designate the DMA device in console messages, for
+ administration or debugging purposes.
--- /dev/null
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cryptodev_lib
compressdev
regexdev
+ dmadev
rte_security
rawdev
link_bonding_poll_mode_drv_lib
* Modified to allow ``--huge-dir`` option to specify a sub-directory
within a hugetlbfs mountpoint.
+* **Added dmadev library.**
+
+ * Added a DMA device framework for management and provision of
+ hardware and software DMA devices.
+
* **Added new RSS offload types for IPv4/L4 checksum in RSS flow.**
Added macros ETH_RSS_IPV4_CHKSUM and ETH_RSS_L4_CHKSUM, now IPv4 and
--- /dev/null
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright 2021 HiSilicon Limited
+
+drivers = []
'vdpa', # depends on common, bus and mempool.
'event', # depends on common, bus, mempool and net.
'baseband', # depends on common and bus.
+ 'dma', # depends on common and bus.
]
if meson.is_cross_build()
--- /dev/null
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2021 HiSilicon Limited.
+
+sources = files('rte_dmadev.c')
+headers = files('rte_dmadev.h')
+driver_sdk_headers += files('rte_dmadev_pmd.h')
--- /dev/null
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2021 HiSilicon Limited
+ * Copyright(c) 2021 Intel Corporation
+ */
+
+#include <inttypes.h>
+
+#include <rte_eal.h>
+#include <rte_lcore.h>
+#include <rte_log.h>
+#include <rte_malloc.h>
+#include <rte_memzone.h>
+#include <rte_string_fns.h>
+
+#include "rte_dmadev.h"
+#include "rte_dmadev_pmd.h"
+
+static int16_t dma_devices_max;
+
+struct rte_dma_dev *rte_dma_devices;
+
+RTE_LOG_REGISTER_DEFAULT(rte_dma_logtype, INFO);
+#define RTE_DMA_LOG(level, ...) \
+ rte_log(RTE_LOG_ ## level, rte_dma_logtype, RTE_FMT("dma: " \
+ RTE_FMT_HEAD(__VA_ARGS__,) "\n", RTE_FMT_TAIL(__VA_ARGS__,)))
+
+int
+rte_dma_dev_max(size_t dev_max)
+{
+ /* This function may be called before rte_eal_init(), so no rte library
+ * function can be called in this function.
+ */
+ if (dev_max == 0 || dev_max > INT16_MAX)
+ return -EINVAL;
+
+ if (dma_devices_max > 0)
+ return -EINVAL;
+
+ dma_devices_max = dev_max;
+
+ return 0;
+}
+
+static int
+dma_check_name(const char *name)
+{
+ size_t name_len;
+
+ if (name == NULL) {
+ RTE_DMA_LOG(ERR, "Name can't be NULL");
+ return -EINVAL;
+ }
+
+ name_len = strnlen(name, RTE_DEV_NAME_MAX_LEN);
+ if (name_len == 0) {
+ RTE_DMA_LOG(ERR, "Zero length DMA device name");
+ return -EINVAL;
+ }
+ if (name_len >= RTE_DEV_NAME_MAX_LEN) {
+ RTE_DMA_LOG(ERR, "DMA device name is too long");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int16_t
+dma_find_free_id(void)
+{
+ int16_t i;
+
+ if (rte_dma_devices == NULL)
+ return -1;
+
+ for (i = 0; i < dma_devices_max; i++) {
+ if (rte_dma_devices[i].state == RTE_DMA_DEV_UNUSED)
+ return i;
+ }
+
+ return -1;
+}
+
+static struct rte_dma_dev*
+dma_find_by_name(const char *name)
+{
+ int16_t i;
+
+ if (rte_dma_devices == NULL)
+ return NULL;
+
+ for (i = 0; i < dma_devices_max; i++) {
+ if ((rte_dma_devices[i].state != RTE_DMA_DEV_UNUSED) &&
+ (!strcmp(name, rte_dma_devices[i].dev_name)))
+ return &rte_dma_devices[i];
+ }
+
+ return NULL;
+}
+
+static int
+dma_dev_data_prepare(void)
+{
+ size_t size;
+
+ if (rte_dma_devices != NULL)
+ return 0;
+
+ size = dma_devices_max * sizeof(struct rte_dma_dev);
+ rte_dma_devices = malloc(size);
+ if (rte_dma_devices == NULL)
+ return -ENOMEM;
+ memset(rte_dma_devices, 0, size);
+
+ return 0;
+}
+
+static int
+dma_data_prepare(void)
+{
+ if (dma_devices_max == 0)
+ dma_devices_max = RTE_DMADEV_DEFAULT_MAX;
+ return dma_dev_data_prepare();
+}
+
+static struct rte_dma_dev *
+dma_allocate(const char *name, int numa_node, size_t private_data_size)
+{
+ struct rte_dma_dev *dev;
+ void *dev_private;
+ int16_t dev_id;
+ int ret;
+
+ ret = dma_data_prepare();
+ if (ret < 0) {
+ RTE_DMA_LOG(ERR, "Cannot initialize dmadevs data");
+ return NULL;
+ }
+
+ dev = dma_find_by_name(name);
+ if (dev != NULL) {
+ RTE_DMA_LOG(ERR, "DMA device already allocated");
+ return NULL;
+ }
+
+ dev_private = rte_zmalloc_socket(name, private_data_size,
+ RTE_CACHE_LINE_SIZE, numa_node);
+ if (dev_private == NULL) {
+ RTE_DMA_LOG(ERR, "Cannot allocate private data");
+ return NULL;
+ }
+
+ dev_id = dma_find_free_id();
+ if (dev_id < 0) {
+ RTE_DMA_LOG(ERR, "Reached maximum number of DMA devices");
+ rte_free(dev_private);
+ return NULL;
+ }
+
+ dev = &rte_dma_devices[dev_id];
+ rte_strscpy(dev->dev_name, name, sizeof(dev->dev_name));
+ dev->dev_id = dev_id;
+ dev->numa_node = numa_node;
+ dev->dev_private = dev_private;
+
+ return dev;
+}
+
+static void
+dma_release(struct rte_dma_dev *dev)
+{
+ rte_free(dev->dev_private);
+ memset(dev, 0, sizeof(struct rte_dma_dev));
+}
+
+struct rte_dma_dev *
+rte_dma_pmd_allocate(const char *name, int numa_node, size_t private_data_size)
+{
+ struct rte_dma_dev *dev;
+
+ if (dma_check_name(name) != 0 || private_data_size == 0)
+ return NULL;
+
+ dev = dma_allocate(name, numa_node, private_data_size);
+ if (dev == NULL)
+ return NULL;
+
+ dev->state = RTE_DMA_DEV_REGISTERED;
+
+ return dev;
+}
+
+int
+rte_dma_pmd_release(const char *name)
+{
+ struct rte_dma_dev *dev;
+
+ if (dma_check_name(name) != 0)
+ return -EINVAL;
+
+ dev = dma_find_by_name(name);
+ if (dev == NULL)
+ return -EINVAL;
+
+ dma_release(dev);
+ return 0;
+}
+
+int
+rte_dma_get_dev_id_by_name(const char *name)
+{
+ struct rte_dma_dev *dev;
+
+ if (dma_check_name(name) != 0)
+ return -EINVAL;
+
+ dev = dma_find_by_name(name);
+ if (dev == NULL)
+ return -EINVAL;
+
+ return dev->dev_id;
+}
+
+bool
+rte_dma_is_valid(int16_t dev_id)
+{
+ return (dev_id >= 0) && (dev_id < dma_devices_max) &&
+ rte_dma_devices != NULL &&
+ rte_dma_devices[dev_id].state != RTE_DMA_DEV_UNUSED;
+}
+
+uint16_t
+rte_dma_count_avail(void)
+{
+ uint16_t count = 0;
+ uint16_t i;
+
+ if (rte_dma_devices == NULL)
+ return count;
+
+ for (i = 0; i < dma_devices_max; i++) {
+ if (rte_dma_devices[i].state != RTE_DMA_DEV_UNUSED)
+ count++;
+ }
+
+ return count;
+}
--- /dev/null
+/* 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
+ *
+ * DMA (Direct Memory Access) device API.
+ *
+ * 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.
+ *
+ * This framework uses 'int16_t dev_id' as the device identifier of a dmadev,
+ * and 'uint16_t vchan' as the virtual DMA channel identifier in one dmadev.
+ *
+ */
+
+#include <stdint.h>
+
+#include <rte_bitops.h>
+#include <rte_common.h>
+#include <rte_compat.h>
+#include <rte_dev.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Maximum number of devices if rte_dma_dev_max() is not called. */
+#define RTE_DMADEV_DEFAULT_MAX 64
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Configure the maximum number of dmadevs.
+ * @note This function can be invoked before the primary process rte_eal_init()
+ * to change the maximum number of dmadevs. If not invoked, the maximum number
+ * of dmadevs is @see RTE_DMADEV_DEFAULT_MAX
+ *
+ * @param dev_max
+ * maximum number of dmadevs.
+ *
+ * @return
+ * 0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int rte_dma_dev_max(size_t dev_max);
+
+/**
+ * @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_dma_get_dev_id_by_name(const char *name);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Check whether the dev_id is valid.
+ *
+ * @param dev_id
+ * DMA device index.
+ *
+ * @return
+ * - If the device index is valid (true) or not (false).
+ */
+__rte_experimental
+bool rte_dma_is_valid(int16_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_dma_count_avail(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_DMADEV_H */
--- /dev/null
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2021 HiSilicon Limited
+ */
+
+#ifndef RTE_DMADEV_PMD_H
+#define RTE_DMADEV_PMD_H
+
+/**
+ * @file
+ *
+ * DMA Device PMD interface
+ *
+ * Driver facing interface for a DMA device. These are not to be called directly
+ * by any application.
+ */
+
+#include "rte_dmadev.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Possible states of a DMA device.
+ *
+ * @see struct rte_dma_dev::state
+ */
+enum rte_dma_dev_state {
+ RTE_DMA_DEV_UNUSED = 0, /**< Device is unused. */
+ /** Device is registered, but not ready to be used. */
+ RTE_DMA_DEV_REGISTERED,
+ /** Device is ready for use. This is set by the PMD. */
+ RTE_DMA_DEV_READY,
+};
+
+/**
+ * @internal
+ * The generic data structure associated with each DMA device.
+ */
+struct rte_dma_dev {
+ char dev_name[RTE_DEV_NAME_MAX_LEN]; /**< Unique identifier name */
+ int16_t dev_id; /**< Device [external] identifier. */
+ int16_t numa_node; /**< Local NUMA memory ID. -1 if unknown. */
+ void *dev_private; /**< PMD-specific private data. */
+ /** Device info which supplied during device initialization. */
+ struct rte_device *device;
+ enum rte_dma_dev_state state; /**< Flag indicating the device state. */
+ uint64_t reserved[2]; /**< Reserved for future fields. */
+} __rte_cache_aligned;
+
+extern struct rte_dma_dev *rte_dma_devices;
+
+/**
+ * @internal
+ * Allocate a new dmadev slot for an DMA device and return the pointer to that
+ * slot for the driver to use.
+ *
+ * @param name
+ * DMA device name.
+ * @param numa_node
+ * Driver's private data's NUMA node.
+ * @param private_data_size
+ * Driver's private data size.
+ *
+ * @return
+ * A pointer to the DMA device slot case of success,
+ * NULL otherwise.
+ */
+__rte_internal
+struct rte_dma_dev *rte_dma_pmd_allocate(const char *name, int numa_node,
+ size_t private_data_size);
+
+/**
+ * @internal
+ * Release the specified dmadev.
+ *
+ * @param name
+ * DMA device name.
+ *
+ * @return
+ * - 0 on success, negative on error.
+ */
+__rte_internal
+int rte_dma_pmd_release(const char *name);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_DMADEV_PMD_H */
--- /dev/null
+EXPERIMENTAL {
+ global:
+
+ rte_dma_count_avail;
+ rte_dma_dev_max;
+ rte_dma_get_dev_id_by_name;
+ rte_dma_is_valid;
+
+ local: *;
+};
+
+INTERNAL {
+ global:
+
+ rte_dma_devices;
+ rte_dma_pmd_allocate;
+ rte_dma_pmd_release;
+
+ local: *;
+};
'pdump',
'rawdev',
'regexdev',
+ 'dmadev',
'rib',
'reorder',
'sched',
git.droids-corp.org / dpdk.git / commitdiff
