/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2018-2022 Intel Corporation
 */

#include <rte_string_fns.h>
#include <rte_devargs.h>
#include <ctype.h>

#include "qat_device.h"
#include "adf_transport_access_macros.h"
#include "qat_sym.h"
#include "qat_comp_pmd.h"
#include "adf_pf2vf_msg.h"
#include "qat_pf2vf.h"

#define NOT_NULL(arg, func, msg, ...)		\
	do {					\
		if (arg == NULL) {		\
			QAT_LOG(ERR,		\
			msg, ##__VA_ARGS__);	\
			func;			\
		}				\
	} while (0)

/* Hardware device information per generation */
struct qat_gen_hw_data qat_gen_config[QAT_N_GENS];
struct qat_dev_hw_spec_funcs *qat_dev_hw_spec[QAT_N_GENS];

struct qat_service qat_service[QAT_MAX_SERVICES];

/* per-process array of device data */
struct qat_device_info qat_pci_devs[RTE_PMD_QAT_MAX_PCI_DEVICES];
static int qat_nb_pci_devices;

/*
 * The set of PCI devices this driver supports
 */

static const struct rte_pci_id pci_id_qat_map[] = {
		{
			RTE_PCI_DEVICE(0x8086, 0x0443),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x37c9),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x19e3),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x6f55),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x18ef),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x18a1),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x578b),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x4941),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x4943),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x4945),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x4947),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x1454),
		},
		{
			RTE_PCI_DEVICE(0x8086, 0x0da5),
		},
		{.device_id = 0},
};

static int
qat_pci_get_extra_size(enum qat_device_gen qat_dev_gen)
{
	struct qat_dev_hw_spec_funcs *ops_hw =
		qat_dev_hw_spec[qat_dev_gen];
	if (ops_hw->qat_dev_get_extra_size == NULL)
		return -ENOTSUP;
	return ops_hw->qat_dev_get_extra_size();
}

static struct qat_pci_device *
qat_pci_get_named_dev(const char *name)
{
	unsigned int i;

	if (name == NULL)
		return NULL;

	for (i = 0; i < RTE_PMD_QAT_MAX_PCI_DEVICES; i++) {
		if (qat_pci_devs[i].mz &&
				(strcmp(((struct qat_pci_device *)
				qat_pci_devs[i].mz->addr)->name, name)
				== 0))
			return (struct qat_pci_device *)
				qat_pci_devs[i].mz->addr;
	}

	return NULL;
}

static uint8_t
qat_pci_find_free_device_index(void)
{
		uint8_t dev_id;

		for (dev_id = 0; dev_id < RTE_PMD_QAT_MAX_PCI_DEVICES;
				dev_id++) {
			if (qat_pci_devs[dev_id].mz == NULL)
				break;
		}
		return dev_id;
}

static struct qat_pci_device *
qat_get_qat_dev_from_pci_dev(struct rte_pci_device *pci_dev)
{
	char name[QAT_DEV_NAME_MAX_LEN];

	rte_pci_device_name(&pci_dev->addr, name, sizeof(name));

	return qat_pci_get_named_dev(name);
}

static enum qat_device_gen
pick_gen(const struct rte_pci_device *pci_dev)
{
	switch (pci_dev->id.device_id) {
	case 0x0443:
		return QAT_GEN1;
	case 0x37c9:
	case 0x19e3:
	case 0x6f55:
	case 0x18ef:
		return QAT_GEN2;
	case 0x18a1:
	case 0x578b:
		return QAT_GEN3;
	case 0x4941:
	case 0x4943:
	case 0x4945:
		return QAT_GEN4;
	case 0x4947:
		return QAT_GEN5;
	case 0x1454:
		return QAT_GEN_LCE;
	case 0x0da5:
		return QAT_VQAT;
	default:
		QAT_LOG(ERR, "Invalid dev_id, can't determine generation");
		return QAT_N_GENS;
	}
}

static int
wireless_slice_support(uint16_t pci_dev_id)
{
	return pci_dev_id == 0x578b ||
			pci_dev_id == 0x4947;
}

/* This function base on the atoi function peculiarity, non integral part
 * other than the equals sign is ignored. It will not work with other conversion
 * functions like strt*.
 */
char *qat_dev_cmdline_get_val(struct qat_pci_device *qat_dev,
	const char *key)
{
	if (qat_dev->command_line == NULL)
		return NULL;
	key = strstr(qat_dev->command_line, key);
	/* At this point, a key should be validated */
	return key ? strchr(key, '=') + 1 : NULL;
}

static int cmdline_validate(const char *arg)
{
	int i, len;
	char *eq_sign = strchr(arg, '=');
	/* Check for the equal sign */
	if (eq_sign == NULL) {
		QAT_LOG(ERR, "malformed string, no equals sign, %s", arg);
		return 0;
	}
	/* Check if an argument is not empty */
	len = strlen(eq_sign) - 1;
	if (len == 0) {
		QAT_LOG(ERR, "malformed string, empty argument, %s", arg);
		return 0;
	}
	len = eq_sign - arg;
	for (i = 0; i < QAT_MAX_SERVICES + 1; i++) {
		int j = 0;
		const char *def = NULL;

		if (!qat_cmdline_defines[i])
			continue;
		while ((def = qat_cmdline_defines[i][j++])) {
			if (strncmp(def, arg, len))
				continue;
			QAT_LOG(DEBUG, "Found %s command line argument",
				def);
			return 1;
		}
	}
	return 0;
}

static int
qat_dev_parse_command_line(struct qat_pci_device *qat_dev,
	struct rte_devargs *devargs)
{
	int len = 0;
	char *token = NULL;

	if (!devargs)
		return 0;

	len = strlen(devargs->drv_str);
	if (len == 0)
		return 0;
	/* Allocate per-device command line */
	qat_dev->command_line = rte_malloc(NULL, len, 0);
	if (qat_dev->command_line == NULL) {
		QAT_LOG(ERR, "Cannot allocate memory for command line");
		return -1;
	}
	strcpy(qat_dev->command_line, devargs->drv_str);
	token = strtok(qat_dev->command_line, ",");
	while (token != NULL) {
		if (!cmdline_validate(token)) {
			QAT_LOG(ERR, "Incorrect command line argument: %s",
				token);
			return -1;
		}
		token = strtok(NULL, ",");
	}
	/* Copy once againe the entire string, strtok already altered the contents */
	strcpy(qat_dev->command_line, devargs->drv_str);
	return 0;
}

static struct qat_pci_device *
qat_pci_device_allocate(struct rte_pci_device *pci_dev)
{
	struct qat_pci_device *qat_dev;
	enum qat_device_gen qat_dev_gen;
	uint8_t qat_dev_id = 0;
	char name[QAT_DEV_NAME_MAX_LEN];
	struct rte_devargs *devargs = pci_dev->device.devargs;
	struct qat_dev_hw_spec_funcs *ops_hw;
	struct rte_mem_resource *mem_resource;
	const struct rte_memzone *qat_dev_mz;
	int qat_dev_size, extra_size;
	char *cmdline = NULL;

	rte_pci_device_name(&pci_dev->addr, name, sizeof(name));
	snprintf(name+strlen(name), QAT_DEV_NAME_MAX_LEN-strlen(name), "_qat");

	qat_dev_gen = pick_gen(pci_dev);
	if (qat_dev_gen == QAT_N_GENS) {
		QAT_LOG(ERR, "Invalid dev_id, can't determine generation");
		return NULL;
	}

	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
		const struct rte_memzone *mz = rte_memzone_lookup(name);

		if (mz == NULL) {
			QAT_LOG(ERR,
				"Secondary can't find %s mz, did primary create device?",
				name);
			return NULL;
		}
		qat_dev = mz->addr;
		qat_pci_devs[qat_dev->qat_dev_id].mz = mz;
		qat_pci_devs[qat_dev->qat_dev_id].pci_dev = pci_dev;
		qat_nb_pci_devices++;
		QAT_LOG(DEBUG, "QAT device %d found, name %s, total QATs %d",
			qat_dev->qat_dev_id, qat_dev->name, qat_nb_pci_devices);
		return qat_dev;
	}

	if (qat_pci_get_named_dev(name) != NULL) {
		QAT_LOG(ERR, "QAT device with name %s already allocated!",
				name);
		return NULL;
	}

	qat_dev_id = qat_pci_find_free_device_index();
	if (qat_dev_id == RTE_PMD_QAT_MAX_PCI_DEVICES) {
		QAT_LOG(ERR, "Reached maximum number of QAT devices");
		return NULL;
	}

	extra_size = qat_pci_get_extra_size(qat_dev_gen);
	if (extra_size < 0) {
		QAT_LOG(ERR, "QAT internal error: no pci pointer for gen %d",
			qat_dev_gen);
		return NULL;
	}

	qat_dev_size = sizeof(struct qat_pci_device) + sizeof(void *) *
				QAT_MAX_SERVICES + extra_size;
	qat_dev_mz = rte_memzone_reserve(name, qat_dev_size,
		rte_socket_id(), 0);

	if (qat_dev_mz == NULL) {
		QAT_LOG(ERR, "Error when allocating memzone for QAT_%d",
			qat_dev_id);
		return NULL;
	}

	qat_dev = qat_dev_mz->addr;
	memset(qat_dev, 0, qat_dev_size);
	qat_dev->dev_private = qat_dev + 1;
	strlcpy(qat_dev->name, name, QAT_DEV_NAME_MAX_LEN);
	qat_dev->qat_dev_id = qat_dev_id;
	qat_dev->qat_dev_gen = qat_dev_gen;
	qat_pci_devs[qat_dev_id].pci_dev = pci_dev;

	if (wireless_slice_support(pci_dev->id.device_id))
		qat_dev->options.has_wireless_slice = 1;

	ops_hw = qat_dev_hw_spec[qat_dev->qat_dev_gen];
	NOT_NULL(ops_hw->qat_dev_get_misc_bar, goto error,
		"QAT internal error! qat_dev_get_misc_bar function not set");
	if (ops_hw->qat_dev_get_misc_bar(&mem_resource, pci_dev) == 0) {
		if (mem_resource->addr == NULL) {
			QAT_LOG(ERR, "QAT cannot get access to VF misc bar");
			goto error;
		}
		qat_dev->misc_bar_io_addr = mem_resource->addr;
	} else
		qat_dev->misc_bar_io_addr = NULL;

	/* Parse the command line */
	if (qat_dev_parse_command_line(qat_dev, devargs))
		goto error;

	/* Parse the arguments */
	cmdline = qat_dev_cmdline_get_val(qat_dev, QAT_LEGACY_CAPA);
	if (cmdline)
		qat_dev->options.legacy_alg = atoi(cmdline);

	if (qat_read_qp_config(qat_dev)) {
		QAT_LOG(ERR,
			"Cannot acquire ring configuration for QAT_%d",
			qat_dev_id);
		goto error;
	}
	NOT_NULL(ops_hw->qat_dev_reset_ring_pairs, goto error,
		"QAT internal error! Reset ring pairs function not set, gen : %d",
		qat_dev_gen);
	if (ops_hw->qat_dev_reset_ring_pairs(qat_dev)) {
		QAT_LOG(ERR,
			"Cannot reset ring pairs, does pf driver supports pf2vf comms?"
			);
		goto error;
	}
	NOT_NULL(ops_hw->qat_dev_get_slice_map, goto error,
		"QAT internal error! Read slice function not set, gen : %d",
		qat_dev_gen);
	if (ops_hw->qat_dev_get_slice_map(&qat_dev->options.slice_map, pci_dev) < 0) {
		QAT_LOG(ERR,
			"Cannot read slice configuration");
		goto error;
	}
	rte_spinlock_init(&qat_dev->arb_csr_lock);

	/* No errors when allocating, attach memzone with
	 * qat_dev to list of devices
	 */
	qat_pci_devs[qat_dev_id].mz = qat_dev_mz;
	qat_nb_pci_devices++;

	QAT_LOG(DEBUG, "QAT device %d found, name %s, total QATs %d",
			qat_dev->qat_dev_id, qat_dev->name, qat_nb_pci_devices);

	return qat_dev;
error:
	rte_free(qat_dev->command_line);
	rte_memzone_free(qat_dev_mz);
	return NULL;
}

static int
qat_pci_device_release(struct rte_pci_device *pci_dev)
{
	struct qat_pci_device *qat_dev;
	char name[QAT_DEV_NAME_MAX_LEN];
	int busy = 0, i;

	if (pci_dev == NULL)
		return -EINVAL;

	rte_pci_device_name(&pci_dev->addr, name, sizeof(name));
	snprintf(name+strlen(name), QAT_DEV_NAME_MAX_LEN-strlen(name), "_qat");
	qat_dev = qat_pci_get_named_dev(name);
	if (qat_dev != NULL) {

		struct qat_device_info *inst =
				&qat_pci_devs[qat_dev->qat_dev_id];
		/* Check that there are no service devs still on pci device */

		if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
			for (i = 0; i < QAT_MAX_SERVICES; i++) {
				if (qat_dev->pmd[i] != NULL) {
					QAT_LOG(DEBUG, "QAT %s device %s is busy",
						qat_service[i].name, name);
					busy = 1;
				}
			}
			if (busy)
				return -EBUSY;
			rte_memzone_free(inst->mz);
		}
		memset(inst, 0, sizeof(struct qat_device_info));
		qat_nb_pci_devices--;
		QAT_LOG(DEBUG, "QAT device %s released, total QATs %d",
					name, qat_nb_pci_devices);
	}
	return 0;
}

static int
qat_pci_dev_destroy(struct qat_pci_device *qat_pci_dev,
		struct rte_pci_device *pci_dev)
{
	int i;

	for (i = 0; i < QAT_MAX_SERVICES; i++) {
		if (!qat_service[i].dev_destroy)
			continue;
		qat_service[i].dev_destroy(qat_pci_dev);
	}
	return qat_pci_device_release(pci_dev);
}

static int qat_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
		struct rte_pci_device *pci_dev)
{
	int i, ret = 0, num_pmds_created = 0;
	struct qat_pci_device *qat_pci_dev;

	QAT_LOG(DEBUG, "Found QAT device at %02x:%02x.%x",
			pci_dev->addr.bus,
			pci_dev->addr.devid,
			pci_dev->addr.function);

	qat_pci_dev = qat_pci_device_allocate(pci_dev);
	if (qat_pci_dev == NULL)
		return -ENODEV;

	for (i = 0; i < QAT_MAX_SERVICES; i++) {
		if (!qat_service[i].dev_create)
			continue;
		ret = qat_service[i].dev_create(qat_pci_dev);
		if (ret == 0)
			num_pmds_created++;
		else {
			QAT_LOG(WARNING, "Failed to create %s PMD on device %s",
				qat_service[i].name,
				qat_pci_dev->name);
		}
	}

	if (num_pmds_created == 0)
		qat_pci_dev_destroy(qat_pci_dev, pci_dev);

	return 0;
}

static int
qat_pci_remove(struct rte_pci_device *pci_dev)
{
	struct qat_pci_device *qat_pci_dev;

	if (pci_dev == NULL)
		return -EINVAL;

	qat_pci_dev = qat_get_qat_dev_from_pci_dev(pci_dev);
	if (qat_pci_dev == NULL)
		return 0;

	return qat_pci_dev_destroy(qat_pci_dev, pci_dev);
}

static struct rte_pci_driver rte_qat_pmd = {
	.id_table = pci_id_qat_map,
	.drv_flags = RTE_PCI_DRV_NEED_MAPPING,
	.probe = qat_pci_probe,
	.remove = qat_pci_remove
};

RTE_PMD_REGISTER_PCI(QAT_PCI_NAME, rte_qat_pmd);
RTE_PMD_REGISTER_PCI_TABLE(QAT_PCI_NAME, pci_id_qat_map);
RTE_PMD_REGISTER_KMOD_DEP(QAT_PCI_NAME, "* igb_uio | uio_pci_generic | vfio-pci");
