regexdev: add core functions

This commit introduce the API that is needed by the RegEx devices in
order to work with the RegEX lib.

During the probe of a RegEx device, the device should configure itself,
and allocate the resources it requires.
On completion of the device init, it should call the
rte_regex_dev_register in order to register itself as a RegEx device.

Signed-off-by: Ori Kam <orika@mellanox.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Acked-by: Guy Kaneti <guyk@marvell.com>

config/common_base

@@ -739,6 +739,7 @@ CONFIG_RTE_LIBRTE_PMD_ZLIB=n
 # Compile RegEx device support
 #
 CONFIG_RTE_LIBRTE_REGEXDEV=y
+CONFIG_RTE_MAX_REGEXDEV_DEVS=32
 
 #
 # Compile generic event device library

config/rte_config.h

@@ -69,6 +69,9 @@
 /* compressdev defines */
 #define RTE_COMPRESS_MAX_DEVS 64
 
+/* regexdev defines */
+#define RTE_MAX_REGEXDEV_DEVS 32
+
 /* eventdev defines */
 #define RTE_EVENT_MAX_DEVS 16
 #define RTE_EVENT_MAX_QUEUES_PER_DEV 64

lib/librte_regexdev/Makefile

@@ -24,6 +24,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_REGEXDEV) := rte_regexdev.c
 # export include files
 SYMLINK-$(CONFIG_RTE_LIBRTE_REGEXDEV)-include += rte_regexdev.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_REGEXDEV)-include += rte_regexdev_core.h
+SYMLINK-$(CONFIG_RTE_LIBRTE_REGEXDEV)-include += rte_regexdev_driver.h
 
 # versioning export map
 EXPORT_MAP := rte_regexdev_version.map

lib/librte_regexdev/meson.build

@@ -3,5 +3,6 @@
 
 sources = files('rte_regexdev.c')
 headers = files('rte_regexdev.h',
-	'rte_regexdev_core.h')
+	'rte_regexdev_core.h',
+	'rte_regexdev_driver.h')
 deps += ['mbuf']

lib/librte_regexdev/rte_regexdev.c

@@ -3,4 +3,141 @@
  * Copyright 2020 Mellanox Technologies, Ltd
  */
 
+#include <string.h>
+
+#include <rte_memory.h>
+#include <rte_memcpy.h>
+#include <rte_memzone.h>
+#include <rte_string_fns.h>
+
 #include "rte_regexdev.h"
+#include "rte_regexdev_core.h"
+#include "rte_regexdev_driver.h"
+
+static const char *MZ_RTE_REGEXDEV_DATA = "rte_regexdev_data";
+static struct rte_regexdev regex_devices[RTE_MAX_REGEXDEV_DEVS];
+/* Shared memory between primary and secondary processes. */
+static struct {
+	struct rte_regexdev_data data[RTE_MAX_REGEXDEV_DEVS];
+} *rte_regexdev_shared_data;
+
+int rte_regexdev_logtype;
+
+static uint16_t
+regexdev_find_free_dev(void)
+{
+	uint16_t i;
+
+	for (i = 0; i < RTE_MAX_REGEXDEV_DEVS; i++) {
+		if (regex_devices[i].state == RTE_REGEXDEV_UNUSED)
+			return i;
+	}
+	return RTE_MAX_REGEXDEV_DEVS;
+}
+
+static struct rte_regexdev*
+regexdev_allocated(const char *name)
+{
+	uint16_t i;
+
+	for (i = 0; i < RTE_MAX_REGEXDEV_DEVS; i++) {
+		if (regex_devices[i].state != RTE_REGEXDEV_UNUSED)
+			if (!strcmp(name, regex_devices[i].data->dev_name))
+				return &regex_devices[i];
+	}
+	return NULL;
+}
+
+static int
+regexdev_shared_data_prepare(void)
+{
+	const unsigned int flags = 0;
+	const struct rte_memzone *mz;
+
+	if (rte_regexdev_shared_data == NULL) {
+		/* Allocate port data and ownership shared memory. */
+		mz = rte_memzone_reserve(MZ_RTE_REGEXDEV_DATA,
+					 sizeof(*rte_regexdev_shared_data),
+					 rte_socket_id(), flags);
+		if (mz == NULL)
+			return -ENOMEM;
+
+		rte_regexdev_shared_data = mz->addr;
+		memset(rte_regexdev_shared_data->data, 0,
+		       sizeof(rte_regexdev_shared_data->data));
+	}
+	return 0;
+}
+
+static int
+regexdev_check_name(const char *name)
+{
+	size_t name_len;
+
+	if (name == NULL) {
+		RTE_REGEXDEV_LOG(ERR, "Name can't be NULL\n");
+		return -EINVAL;
+	}
+	name_len = strnlen(name, RTE_REGEXDEV_NAME_MAX_LEN);
+	if (name_len == 0) {
+		RTE_REGEXDEV_LOG(ERR, "Zero length RegEx device name\n");
+		return -EINVAL;
+	}
+	if (name_len >= RTE_REGEXDEV_NAME_MAX_LEN) {
+		RTE_REGEXDEV_LOG(ERR, "RegEx device name is too long\n");
+		return -EINVAL;
+	}
+	return (int)name_len;
+
+}
+
+struct rte_regexdev *
+rte_regexdev_register(const char *name)
+{
+	uint16_t dev_id;
+	int name_len;
+	struct rte_regexdev *dev;
+
+	name_len = regexdev_check_name(name);
+	if (name_len < 0)
+		return NULL;
+	dev = regexdev_allocated(name);
+	if (dev != NULL) {
+		RTE_REGEXDEV_LOG(ERR, "RegEx device already allocated\n");
+		return NULL;
+	}
+	dev_id = regexdev_find_free_dev();
+	if (dev_id == RTE_MAX_REGEXDEV_DEVS) {
+		RTE_REGEXDEV_LOG
+			(ERR, "Reached maximum number of RegEx devices\n");
+		return NULL;
+	}
+	if (regexdev_shared_data_prepare() < 0) {
+		RTE_REGEXDEV_LOG(ERR, "Cannot allocate RegEx shared data\n");
+		return NULL;
+	}
+
+	dev = &regex_devices[dev_id];
+	dev->state = RTE_REGEXDEV_REGISTERED;
+	if (dev->data == NULL)
+		dev->data = &rte_regexdev_shared_data->data[dev_id];
+	else
+		memset(dev->data, 1, sizeof(*dev->data));
+	dev->data->dev_id = dev_id;
+	strlcpy(dev->data->dev_name, name, sizeof(dev->data->dev_name));
+	return dev;
+}
+
+void
+rte_regexdev_unregister(struct rte_regexdev *dev)
+{
+	dev->state = RTE_REGEXDEV_UNUSED;
+}
+
+struct rte_regexdev *
+rte_regexdev_get_device_by_name(const char *name)
+{
+	if (regexdev_check_name(name) < 0)
+		return NULL;
+	return regexdev_allocated(name);
+}

lib/librte_regexdev/rte_regexdev.h

@@ -205,6 +205,13 @@ extern "C" {
 #include <rte_mbuf.h>
 #include <rte_memory.h>
 
+#define RTE_REGEXDEV_NAME_MAX_LEN RTE_DEV_NAME_MAX_LEN
+
+extern int rte_regexdev_logtype;
+
+#define RTE_REGEXDEV_LOG(level, ...) \
+	rte_log(RTE_LOG_ ## level, rte_regexdev_logtype, "" __VA_ARGS__)
+
 /**
  * @warning
  * @b EXPERIMENTAL: this API may change without prior notice.

lib/librte_regexdev/rte_regexdev_core.h

@@ -127,6 +127,17 @@ struct rte_regexdev_ops {
 	regexdev_dump_t dev_dump;
 };
 
+/**
+ * Possible states of a RegEx device.
+ */
+enum rte_regexdev_state {
+	RTE_REGEXDEV_UNUSED = 0, /**< Device is unused. */
+	RTE_REGEXDEV_REGISTERED,
+	/**< Device is registered, but not ready to be used. */
+	RTE_REGEXDEV_READY,
+	/**< Device is ready for use. This is set by the PMD. */
+};
+
 /**
  * @internal
  * The data part, with no function pointers, associated with each RegEx device.
@@ -136,6 +147,8 @@ struct rte_regexdev_ops {
  */
 struct rte_regexdev_data {
 	void *dev_private; /**< PMD-specific private data. */
+	char dev_name[RTE_REGEXDEV_NAME_MAX_LEN]; /**< Unique identifier name */
+	uint16_t dev_id; /**< Device [external]  identifier. */
 } __rte_cache_aligned;
 
 /**
@@ -154,6 +167,7 @@ struct rte_regexdev {
 	const struct rte_regexdev_ops *dev_ops;
 	/**< Functions exported by PMD */
 	struct rte_device *device; /**< Backing device */
+	enum rte_regexdev_state state; /**< The device state. */
 	struct rte_regexdev_data *data;  /**< Pointer to device data. */
 } __rte_cache_aligned;
 

lib/librte_regexdev/rte_regexdev_driver.h

@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2020 Mellanox Technologies, Ltd
+ */
+
+#ifndef _RTE_REGEXDEV_DRIVER_H_
+#define _RTE_REGEXDEV_DRIVER_H_
+
+/**
+ * @file
+ *
+ * RTE RegEx Device PMD API
+ *
+ * APIs that are used by the RegEx drivers, to communicate with the
+ * RegEx lib.
+ */
+
+#include "rte_regexdev.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @internal
+ * Register a RegEx device slot for a RegEx device and return the
+ * pointer to that slot.
+ *
+ * @param name
+ *   RegEx device name.
+ *
+ * @return
+ *   A pointer to the RegEx device slot case of success,
+ *   NULL otherwise.
+ */
+struct rte_regexdev *rte_regexdev_register(const char *name);
+
+/**
+ * @internal
+ * Unregister the specified regexdev port.
+ *
+ * @param dev
+ *   Device to be released.
+ */
+void rte_regexdev_unregister(struct rte_regexdev *dev);
+
+/**
+ * @internal
+ * Return the RegEx device based on the device name.
+ *
+ * @param name
+ *   The device name.
+ */
+struct rte_regexdev *rte_regexdev_get_device_by_name(const char *name);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_REGEXDEV_DRIVER_H_ */