xref: /dpdk/drivers/common/mlx5/mlx5_common.h (revision daa9003984eff2b8b794deaefc5fba1f3f9f5bcf)

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2019 Mellanox Technologies, Ltd
 */

#ifndef RTE_PMD_MLX5_COMMON_H_
#define RTE_PMD_MLX5_COMMON_H_

#include <stdio.h>

#include <rte_compat.h>
#include <rte_pci.h>
#include <bus_pci_driver.h>
#include <rte_debug.h>
#include <rte_atomic.h>
#include <rte_rwlock.h>
#include <rte_log.h>
#include <rte_kvargs.h>
#include <rte_devargs.h>
#include <rte_bitops.h>
#include <rte_lcore.h>
#include <rte_spinlock.h>
#include <rte_os_shim.h>

#include "mlx5_prm.h"
#include "mlx5_devx_cmds.h"
#include "mlx5_common_os.h"
#include "mlx5_common_mr.h"

/* Reported driver name. */
#define MLX5_PCI_DRIVER_NAME "mlx5_pci"
#define MLX5_AUXILIARY_DRIVER_NAME "mlx5_auxiliary"

/* Bit-field manipulation. */
#define BITFIELD_DECLARE(bf, type, size) \
	type bf[(((size_t)(size) / (sizeof(type) * CHAR_BIT)) + \
		!!((size_t)(size) % (sizeof(type) * CHAR_BIT)))]
#define BITFIELD_DEFINE(bf, type, size) \
	BITFIELD_DECLARE((bf), type, (size)) = { 0 }
#define BITFIELD_SET(bf, b) \
	(void)((bf)[((b) / (sizeof((bf)[0]) * CHAR_BIT))] |= \
		((size_t)1 << ((b) % (sizeof((bf)[0]) * CHAR_BIT))))
#define BITFIELD_RESET(bf, b) \
	(void)((bf)[((b) / (sizeof((bf)[0]) * CHAR_BIT))] &= \
		~((size_t)1 << ((b) % (sizeof((bf)[0]) * CHAR_BIT))))
#define BITFIELD_ISSET(bf, b) \
	!!(((bf)[((b) / (sizeof((bf)[0]) * CHAR_BIT))] & \
		((size_t)1 << ((b) % (sizeof((bf)[0]) * CHAR_BIT)))))

/*
 * Helper macros to work around __VA_ARGS__ limitations in a C99 compliant
 * manner.
 */
#define PMD_DRV_LOG_STRIP(a, b) a
#define PMD_DRV_LOG_OPAREN (
#define PMD_DRV_LOG_CPAREN )
#define PMD_DRV_LOG_COMMA ,

/* Return the file name part of a path. */
static inline const char *
pmd_drv_log_basename(const char *s)
{
	const char *n = s;

	while (*n)
		if (*(n++) == '/')
			s = n;
	return s;
}

#define PMD_DRV_LOG___(level, type, name, ...) \
	rte_log(RTE_LOG_ ## level, \
		type, \
		RTE_FMT(name ": " \
			RTE_FMT_HEAD(__VA_ARGS__,), \
		RTE_FMT_TAIL(__VA_ARGS__,)))

#ifdef RTE_LIBRTE_MLX5_DEBUG

#define PMD_DRV_LOG__(level, type, name, ...) \
	PMD_DRV_LOG___(level, type, name, "%s:%u: %s(): " __VA_ARGS__)
#define PMD_DRV_LOG_(level, type, name, s, ...) \
	PMD_DRV_LOG__(level, type, name,\
		s "\n" PMD_DRV_LOG_COMMA \
		pmd_drv_log_basename(__FILE__) PMD_DRV_LOG_COMMA \
		__LINE__ PMD_DRV_LOG_COMMA \
		__func__, \
		__VA_ARGS__)

#else /* RTE_LIBRTE_MLX5_DEBUG */
#define PMD_DRV_LOG__(level, type, name, ...) \
	PMD_DRV_LOG___(level, type, name, __VA_ARGS__)
#define PMD_DRV_LOG_(level, type, name, s, ...) \
	PMD_DRV_LOG__(level, type, name, s "\n", __VA_ARGS__)

#endif /* RTE_LIBRTE_MLX5_DEBUG */

/* claim_zero() does not perform any check when debugging is disabled. */
#ifdef RTE_LIBRTE_MLX5_DEBUG

#define MLX5_ASSERT(exp) RTE_VERIFY(exp)
#define claim_zero(...) MLX5_ASSERT((__VA_ARGS__) == 0)
#define claim_nonzero(...) MLX5_ASSERT((__VA_ARGS__) != 0)

#else /* RTE_LIBRTE_MLX5_DEBUG */

#define MLX5_ASSERT(exp) RTE_ASSERT(exp)
#define claim_zero(...) (__VA_ARGS__)
#define claim_nonzero(...) (__VA_ARGS__)

#endif /* RTE_LIBRTE_MLX5_DEBUG */

/**
 * Returns true if debug mode is enabled for fast path operations.
 */
static inline bool
mlx5_fp_debug_enabled(void)
{
#ifdef RTE_LIBRTE_MLX5_DEBUG
	return true;
#else
	return false;
#endif
}

/* Allocate a buffer on the stack and fill it with a printf format string. */
#define MKSTR(name, ...) \
	int mkstr_size_##name = snprintf(NULL, 0, "" __VA_ARGS__); \
	char name[mkstr_size_##name + 1]; \
	\
	memset(name, 0, mkstr_size_##name + 1); \
	snprintf(name, sizeof(name), "" __VA_ARGS__)

enum {
	PCI_VENDOR_ID_MELLANOX = 0x15b3,
};

enum {
	PCI_DEVICE_ID_MELLANOX_CONNECTX4 = 0x1013,
	PCI_DEVICE_ID_MELLANOX_CONNECTX4VF = 0x1014,
	PCI_DEVICE_ID_MELLANOX_CONNECTX4LX = 0x1015,
	PCI_DEVICE_ID_MELLANOX_CONNECTX4LXVF = 0x1016,
	PCI_DEVICE_ID_MELLANOX_CONNECTX5 = 0x1017,
	PCI_DEVICE_ID_MELLANOX_CONNECTX5VF = 0x1018,
	PCI_DEVICE_ID_MELLANOX_CONNECTX5EX = 0x1019,
	PCI_DEVICE_ID_MELLANOX_CONNECTX5EXVF = 0x101a,
	PCI_DEVICE_ID_MELLANOX_BLUEFIELD = 0xa2d2,
	PCI_DEVICE_ID_MELLANOX_BLUEFIELDVF = 0xa2d3,
	PCI_DEVICE_ID_MELLANOX_CONNECTX6 = 0x101b,
	PCI_DEVICE_ID_MELLANOX_CONNECTX6VF = 0x101c,
	PCI_DEVICE_ID_MELLANOX_CONNECTX6DX = 0x101d,
	PCI_DEVICE_ID_MELLANOX_CONNECTXVF = 0x101e,
	PCI_DEVICE_ID_MELLANOX_BLUEFIELD2 = 0xa2d6,
	PCI_DEVICE_ID_MELLANOX_CONNECTX6LX = 0x101f,
	PCI_DEVICE_ID_MELLANOX_CONNECTX7 = 0x1021,
	PCI_DEVICE_ID_MELLANOX_BLUEFIELD3 = 0Xa2dc,
};

/* Maximum number of simultaneous unicast MAC addresses. */
#define MLX5_MAX_UC_MAC_ADDRESSES 128
/* Maximum number of simultaneous Multicast MAC addresses. */
#define MLX5_MAX_MC_MAC_ADDRESSES 128
/* Maximum number of simultaneous MAC addresses. */
#define MLX5_MAX_MAC_ADDRESSES \
	(MLX5_MAX_UC_MAC_ADDRESSES + MLX5_MAX_MC_MAC_ADDRESSES)

/* Recognized Infiniband device physical port name types. */
enum mlx5_nl_phys_port_name_type {
	MLX5_PHYS_PORT_NAME_TYPE_NOTSET = 0, /* Not set. */
	MLX5_PHYS_PORT_NAME_TYPE_LEGACY, /* before kernel ver < 5.0 */
	MLX5_PHYS_PORT_NAME_TYPE_UPLINK, /* p0, kernel ver >= 5.0 */
	MLX5_PHYS_PORT_NAME_TYPE_PFVF, /* pf0vf0, kernel ver >= 5.0 */
	MLX5_PHYS_PORT_NAME_TYPE_PFHPF, /* pf0, kernel ver >= 5.7, HPF rep */
	MLX5_PHYS_PORT_NAME_TYPE_PFSF, /* pf0sf0, kernel ver >= 5.0 */
	MLX5_PHYS_PORT_NAME_TYPE_UNKNOWN, /* Unrecognized. */
};

/** Switch information returned by mlx5_nl_switch_info(). */
struct mlx5_switch_info {
	uint32_t master:1; /**< Master device. */
	uint32_t representor:1; /**< Representor device. */
	enum mlx5_nl_phys_port_name_type name_type; /** < Port name type. */
	int32_t ctrl_num; /**< Controller number (valid for c#pf#vf# format). */
	int32_t pf_num; /**< PF number (valid for pfxvfx format only). */
	int32_t port_name; /**< Representor port name. */
	int32_t mpesw_owner; /**< MPESW owner port number. */
	uint64_t switch_id; /**< Switch identifier. */
};

/* CQE status. */
enum mlx5_cqe_status {
	MLX5_CQE_STATUS_SW_OWN = -1,
	MLX5_CQE_STATUS_HW_OWN = -2,
	MLX5_CQE_STATUS_ERR = -3,
};

/**
 * Check whether CQE has an error opcode.
 *
 * @param op_code
 *   Opcode to check.
 *
 * @return
 *   The CQE status.
 */
static __rte_always_inline enum mlx5_cqe_status
check_cqe_error(const uint8_t op_code)
{
	/* Prevent speculative reading of other fields in CQE until
	 * CQE is valid.
	 */
	rte_atomic_thread_fence(rte_memory_order_acquire);

	if (unlikely(op_code == MLX5_CQE_RESP_ERR ||
		     op_code == MLX5_CQE_REQ_ERR))
		return MLX5_CQE_STATUS_ERR;
	return MLX5_CQE_STATUS_SW_OWN;
}

/**
 * Check whether CQE is valid using owner bit.
 *
 * @param cqe
 *   Pointer to CQE.
 * @param cqes_n
 *   Size of completion queue.
 * @param ci
 *   Consumer index.
 *
 * @return
 *   The CQE status.
 */
static __rte_always_inline enum mlx5_cqe_status
check_cqe(volatile struct mlx5_cqe *cqe, const uint16_t cqes_n,
	  const uint16_t ci)
{
	const uint16_t idx = ci & cqes_n;
	const uint8_t op_own = cqe->op_own;
	const uint8_t op_owner = MLX5_CQE_OWNER(op_own);
	const uint8_t op_code = MLX5_CQE_OPCODE(op_own);

	if (unlikely((op_owner != (!!(idx))) ||
		     (op_code == MLX5_CQE_INVALID)))
		return MLX5_CQE_STATUS_HW_OWN;
	return check_cqe_error(op_code);
}

/**
 * Check whether CQE is valid using validity iteration count.
 *
 * @param cqe
 *   Pointer to CQE.
 * @param cqes_n
 *   Log 2 of completion queue size.
 * @param ci
 *   Consumer index.
 *
 * @return
 *   The CQE status.
 */
static __rte_always_inline enum mlx5_cqe_status
check_cqe_iteration(volatile struct mlx5_cqe *cqe, const uint16_t cqes_n,
		    const uint32_t ci)
{
	const uint8_t op_own = cqe->op_own;
	const uint8_t op_code = MLX5_CQE_OPCODE(op_own);
	const uint8_t vic = ci >> cqes_n;

	if (unlikely((cqe->validity_iteration_count != vic) ||
		     (op_code == MLX5_CQE_INVALID)))
		return MLX5_CQE_STATUS_HW_OWN;
	return check_cqe_error(op_code);
}

/*
 * Get PCI address <DBDF> string from EAL device.
 *
 * @param[out] addr
 *	The output address buffer string
 * @param[in] size
 *	The output buffer size
 * @return
 *   - 0 on success.
 *   - Negative value and rte_errno is set otherwise.
 */
__rte_internal
int mlx5_dev_to_pci_str(const struct rte_device *dev, char *addr, size_t size);

/*
 * Get PCI address from sysfs of a PCI-related device.
 *
 * @param[in] dev_path
 *   The sysfs path should not point to the direct plain PCI device.
 *   Instead, the node "/device/" is used to access the real device.
 * @param[out] pci_addr
 *   Parsed PCI address.
 *
 * @return
 *   - 0 on success.
 *   - Negative value and rte_errno is set otherwise.
 */
__rte_internal
int mlx5_get_pci_addr(const char *dev_path, struct rte_pci_addr *pci_addr);

/*
 * Get kernel network interface name from sysfs IB device path.
 *
 * @param[in] ibdev_path
 *   The sysfs path to IB device.
 * @param[out] ifname
 *   Interface name output of size IF_NAMESIZE.
 *
 * @return
 *   - 0 on success.
 *   - Negative value and rte_errno is set otherwise.
 */
__rte_internal
int mlx5_get_ifname_sysfs(const char *ibdev_path, char *ifname);

__rte_internal
int mlx5_auxiliary_get_child_name(const char *dev, const char *node,
				  char *child, size_t size);

enum mlx5_class {
	MLX5_CLASS_INVALID,
	MLX5_CLASS_ETH = RTE_BIT64(0),
	MLX5_CLASS_VDPA = RTE_BIT64(1),
	MLX5_CLASS_REGEX = RTE_BIT64(2),
	MLX5_CLASS_COMPRESS = RTE_BIT64(3),
	MLX5_CLASS_CRYPTO = RTE_BIT64(4),
};

#define MLX5_DBR_SIZE RTE_CACHE_LINE_SIZE

/* devX creation object */
struct mlx5_devx_obj {
	void *obj; /* The DV object. */
	int id; /* The object ID. */
};

/* UMR memory buffer used to define 1 entry in indirect mkey. */
struct mlx5_klm {
	uint32_t byte_count;
	uint32_t mkey;
	uint64_t address;
};

/** Control for key/values list. */
struct mlx5_kvargs_ctrl {
	struct rte_kvargs *kvlist; /* Structure containing list of key/values.*/
	bool is_used[RTE_KVARGS_MAX]; /* Indicator which devargs were used. */
};

/**
 * Call a handler function for each key/value in the list of keys.
 *
 * For each key/value association that matches the given key, calls the
 * handler function with the for a given arg_name passing the value on the
 * dictionary for that key and a given extra argument.
 *
 * @param mkvlist
 *   The mlx5_kvargs structure.
 * @param keys
 *   A list of keys to process (table of const char *, the last must be NULL).
 * @param handler
 *   The function to call for each matching key.
 * @param opaque_arg
 *   A pointer passed unchanged to the handler.
 *
 * @return
 *   - 0 on success
 *   - Negative on error
 */
__rte_internal
int
mlx5_kvargs_process(struct mlx5_kvargs_ctrl *mkvlist, const char *const keys[],
		    arg_handler_t handler, void *opaque_arg);

/* All UAR arguments using doorbell register in datapath. */
struct mlx5_uar_data {
	uint64_t *db;
	/* The doorbell's virtual address mapped to the relevant HW UAR space.*/
#ifndef RTE_ARCH_64
	rte_spinlock_t *sl_p;
	/* Pointer to UAR access lock required for 32bit implementations. */
#endif /* RTE_ARCH_64 */
};

/* DevX UAR control structure. */
struct mlx5_uar {
	struct mlx5_uar_data bf_db; /* UAR data for Blueflame register. */
	struct mlx5_uar_data cq_db; /* UAR data for CQ arm db register. */
	void *obj; /* DevX UAR object. */
	bool dbnc; /* Doorbell mapped to non-cached region. */
#ifndef RTE_ARCH_64
	rte_spinlock_t bf_sl;
	rte_spinlock_t cq_sl;
	/* UAR access locks required for 32bit implementations. */
#endif /* RTE_ARCH_64 */
};

/**
 * Ring a doorbell and flush the update if requested.
 *
 * @param uar
 *   Pointer to UAR data structure.
 * @param val
 *   value to write in big endian format.
 * @param index
 *   Index of doorbell record.
 * @param db_rec
 *   Address of doorbell record.
 * @param flash
 *   Decide whether to flush the DB writing using a memory barrier.
 */
static __rte_always_inline void
mlx5_doorbell_ring(struct mlx5_uar_data *uar, uint64_t val, uint32_t index,
		   volatile uint32_t *db_rec, bool flash)
{
	rte_io_wmb();
	*db_rec = rte_cpu_to_be_32(index);
	/* Ensure ordering between DB record actual update and UAR access. */
	rte_wmb();
#ifdef RTE_ARCH_64
	*uar->db = val;
#else /* !RTE_ARCH_64 */
	rte_spinlock_lock(uar->sl_p);
	*(volatile uint32_t *)uar->db = val;
	rte_io_wmb();
	*((volatile uint32_t *)uar->db + 1) = val >> 32;
	rte_spinlock_unlock(uar->sl_p);
#endif
	if (flash)
		rte_wmb();
}

/**
 * Get the doorbell register mapping type.
 *
 * @param uar_mmap_offset
 *   Mmap offset of Verbs/DevX UAR.
 * @param page_size
 *   System page size
 *
 * @return
 *   1 for non-cached, 0 otherwise.
 */
static inline uint16_t
mlx5_db_map_type_get(off_t uar_mmap_offset, size_t page_size)
{
	off_t cmd = uar_mmap_offset / page_size;

	cmd >>= MLX5_UAR_MMAP_CMD_SHIFT;
	cmd &= MLX5_UAR_MMAP_CMD_MASK;
	if (cmd == MLX5_MMAP_GET_NC_PAGES_CMD)
		return 1;
	return 0;
}

__rte_internal
void mlx5_translate_port_name(const char *port_name_in,
			      struct mlx5_switch_info *port_info_out);
void mlx5_glue_constructor(void);
extern uint8_t haswell_broadwell_cpu;

__rte_internal
void mlx5_common_init(void);

/*
 * Common Driver Interface
 *
 * ConnectX common driver supports multiple classes: net, vDPA, regex, crypto
 * and compress devices. This layer enables creating such multiple classes
 * on a single device by allowing to bind multiple class-specific device
 * drivers to attach to the common driver.
 *
 * ------------  -------------  --------------  -----------------  ------------
 * | mlx5 net |  | mlx5 vdpa |  | mlx5 regex |  | mlx5 compress |  | mlx5 ... |
 * |  driver  |  |  driver   |  |   driver   |  |     driver    |  |  drivers |
 * ------------  -------------  --------------  -----------------  ------------
 *                               ||
 *                        -----------------
 *                        |     mlx5      |
 *                        | common driver |
 *                        -----------------
 *                          |          |
 *                 -----------        -----------------
 *                 |   mlx5  |        |   mlx5        |
 *                 | pci dev |        | auxiliary dev |
 *                 -----------        -----------------
 *
 * - mlx5 PCI bus driver binds to mlx5 PCI devices defined by PCI ID table
 *   of all related devices.
 * - mlx5 class driver such as net, vDPA, regex defines its specific
 *   PCI ID table and mlx5 bus driver probes matching class drivers.
 * - mlx5 common driver is central place that validates supported
 *   class combinations.
 * - mlx5 common driver hides bus difference by resolving device address
 *   from devargs, locating target RDMA device and probing with it.
 */

/*
 * Device configuration structure.
 *
 * Merged configuration from:
 *
 *  - Device capabilities,
 *  - User device parameters disabled features.
 */
struct mlx5_common_dev_config {
	struct mlx5_hca_attr hca_attr; /* HCA attributes. */
	int dbnc; /* Skip doorbell register write barrier. */
	int device_fd; /* Device file descriptor for importation. */
	int pd_handle; /* Protection Domain handle for importation.  */
	unsigned int devx:1; /* Whether devx interface is available or not. */
	unsigned int sys_mem_en:1; /* The default memory allocator. */
	unsigned int mr_mempool_reg_en:1;
	/* Allow/prevent implicit mempool memory registration. */
	unsigned int mr_ext_memseg_en:1;
	/* Whether memseg should be extended for MR creation. */
};

struct mlx5_common_device {
	struct rte_device *dev;
	TAILQ_ENTRY(mlx5_common_device) next;
	uint32_t classes_loaded;
	void *ctx; /* Verbs/DV/DevX context. */
	void *pd; /* Protection Domain. */
	uint32_t pdn; /* Protection Domain Number. */
	struct mlx5_mr_share_cache mr_scache; /* Global shared MR cache. */
	struct mlx5_common_dev_config config; /* Device configuration. */
};

/**
 * Indicates whether PD and CTX are imported from another process,
 * or created by this process.
 *
 * @param cdev
 *   Pointer to common device.
 *
 * @return
 *   True if PD and CTX are imported from another process, False otherwise.
 */
static inline bool
mlx5_imported_pd_and_ctx(struct mlx5_common_device *cdev)
{
	return cdev->config.device_fd != MLX5_ARG_UNSET &&
	       cdev->config.pd_handle != MLX5_ARG_UNSET;
}

/**
 * Initialization function for the driver called during device probing.
 */
typedef int (mlx5_class_driver_probe_t)(struct mlx5_common_device *cdev,
					struct mlx5_kvargs_ctrl *mkvlist);

/**
 * Uninitialization function for the driver called during hot-unplugging.
 */
typedef int (mlx5_class_driver_remove_t)(struct mlx5_common_device *cdev);

/** Device already probed can be probed again to check for new ports. */
#define MLX5_DRV_PROBE_AGAIN 0x0004

/**
 * A structure describing a mlx5 common class driver.
 */
struct mlx5_class_driver {
	TAILQ_ENTRY(mlx5_class_driver) next;
	enum mlx5_class drv_class;            /**< Class of this driver. */
	const char *name;                     /**< Driver name. */
	mlx5_class_driver_probe_t *probe;     /**< Device probe function. */
	mlx5_class_driver_remove_t *remove;   /**< Device remove function. */
	const struct rte_pci_id *id_table;    /**< ID table, NULL terminated. */
	uint32_t probe_again:1;
	/**< Device already probed can be probed again to check new device. */
	uint32_t intr_lsc:1; /**< Supports link state interrupt. */
	uint32_t intr_rmv:1; /**< Supports device remove interrupt. */
};

/**
 * Register a mlx5 device driver.
 *
 * @param driver
 *   A pointer to a mlx5_driver structure describing the driver
 *   to be registered.
 */
__rte_internal
void
mlx5_class_driver_register(struct mlx5_class_driver *driver);

/**
 * Test device is a PCI bus device.
 *
 * @param dev
 *   Pointer to device.
 *
 * @return
 *   - True on device devargs is a PCI bus device.
 *   - False otherwise.
 */
__rte_internal
bool
mlx5_dev_is_pci(const struct rte_device *dev);

/**
 * Test PCI device is a VF device.
 *
 * @param pci_dev
 *   Pointer to PCI device.
 *
 * @return
 *   - True on PCI device is a VF device.
 *   - False otherwise.
 */
__rte_internal
bool
mlx5_dev_is_vf_pci(const struct rte_pci_device *pci_dev);

__rte_internal
int
mlx5_dev_mempool_subscribe(struct mlx5_common_device *cdev);

__rte_internal
void
mlx5_dev_mempool_unregister(struct mlx5_common_device *cdev,
			    struct rte_mempool *mp);

__rte_internal
int
mlx5_devx_uar_prepare(struct mlx5_common_device *cdev, struct mlx5_uar *uar);

__rte_internal
void
mlx5_devx_uar_release(struct mlx5_uar *uar);

/* mlx5_common_os.c */

int mlx5_os_open_device(struct mlx5_common_device *cdev, uint32_t classes);
int mlx5_os_pd_prepare(struct mlx5_common_device *cdev);
int mlx5_os_pd_release(struct mlx5_common_device *cdev);
int mlx5_os_remote_pd_and_ctx_validate(struct mlx5_common_dev_config *config);

/* mlx5 PMD wrapped MR struct. */
struct mlx5_pmd_wrapped_mr {
	uint32_t	     lkey;
	void		     *addr;
	size_t		     len;
	void		     *obj; /* verbs mr object or devx umem object. */
	void		     *imkey; /* DevX indirect mkey object. */
};

__rte_internal
int
mlx5_os_wrapped_mkey_create(void *ctx, void *pd, uint32_t pdn, void *addr,
			    size_t length, struct mlx5_pmd_wrapped_mr *pmd_mr);

__rte_internal
void
mlx5_os_wrapped_mkey_destroy(struct mlx5_pmd_wrapped_mr *pmd_mr);

#endif /* RTE_PMD_MLX5_COMMON_H_ */