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/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2019 Mellanox Technologies, Ltd
 */
#include <unistd.h>

#include <rte_malloc.h>
#include <rte_log.h>
#include <rte_errno.h>
#include <rte_bus_pci.h>
#include <rte_pci.h>

#include <mlx5_glue.h>
#include <mlx5_common.h>
#include <mlx5_devx_cmds.h>
#include <mlx5_prm.h>
#include <mlx5_nl.h>

#include "mlx5_vdpa_utils.h"
#include "mlx5_vdpa.h"


#define MLX5_VDPA_DEFAULT_FEATURES ((1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
			    (1ULL << VIRTIO_F_ANY_LAYOUT) | \
			    (1ULL << VIRTIO_NET_F_MQ) | \
			    (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
			    (1ULL << VIRTIO_F_ORDER_PLATFORM) | \
			    (1ULL << VHOST_F_LOG_ALL))

#define MLX5_VDPA_PROTOCOL_FEATURES \
			    ((1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ) | \
			     (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD) | \
			     (1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER) | \
			     (1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD) | \
			     (1ULL << VHOST_USER_PROTOCOL_F_MQ))

TAILQ_HEAD(mlx5_vdpa_privs, mlx5_vdpa_priv) priv_list =
					      TAILQ_HEAD_INITIALIZER(priv_list);
static pthread_mutex_t priv_list_lock = PTHREAD_MUTEX_INITIALIZER;
int mlx5_vdpa_logtype;

static struct mlx5_vdpa_priv *
mlx5_vdpa_find_priv_resource_by_did(int did)
{
	struct mlx5_vdpa_priv *priv;
	int found = 0;

	pthread_mutex_lock(&priv_list_lock);
	TAILQ_FOREACH(priv, &priv_list, next) {
		if (did == priv->id) {
			found = 1;
			break;
		}
	}
	pthread_mutex_unlock(&priv_list_lock);
	if (!found) {
		DRV_LOG(ERR, "Invalid device id: %d.", did);
		rte_errno = EINVAL;
		return NULL;
	}
	return priv;
}

static int
mlx5_vdpa_get_queue_num(int did, uint32_t *queue_num)
{
	struct mlx5_vdpa_priv *priv = mlx5_vdpa_find_priv_resource_by_did(did);

	if (priv == NULL) {
		DRV_LOG(ERR, "Invalid device id: %d.", did);
		return -1;
	}
	*queue_num = priv->caps.max_num_virtio_queues;
	return 0;
}

static int
mlx5_vdpa_get_vdpa_features(int did, uint64_t *features)
{
	struct mlx5_vdpa_priv *priv = mlx5_vdpa_find_priv_resource_by_did(did);

	if (priv == NULL) {
		DRV_LOG(ERR, "Invalid device id: %d.", did);
		return -1;
	}
	*features = MLX5_VDPA_DEFAULT_FEATURES;
	if (priv->caps.virtio_queue_type & (1 << MLX5_VIRTQ_TYPE_PACKED))
		*features |= (1ULL << VIRTIO_F_RING_PACKED);
	if (priv->caps.tso_ipv4)
		*features |= (1ULL << VIRTIO_NET_F_HOST_TSO4);
	if (priv->caps.tso_ipv6)
		*features |= (1ULL << VIRTIO_NET_F_HOST_TSO6);
	if (priv->caps.tx_csum)
		*features |= (1ULL << VIRTIO_NET_F_CSUM);
	if (priv->caps.rx_csum)
		*features |= (1ULL << VIRTIO_NET_F_GUEST_CSUM);
	if (priv->caps.virtio_version_1_0)
		*features |= (1ULL << VIRTIO_F_VERSION_1);
	return 0;
}

static int
mlx5_vdpa_get_protocol_features(int did, uint64_t *features)
{
	struct mlx5_vdpa_priv *priv = mlx5_vdpa_find_priv_resource_by_did(did);

	if (priv == NULL) {
		DRV_LOG(ERR, "Invalid device id: %d.", did);
		return -1;
	}
	*features = MLX5_VDPA_PROTOCOL_FEATURES;
	return 0;
}

static int
mlx5_vdpa_set_vring_state(int vid, int vring, int state)
{
	int did = rte_vhost_get_vdpa_device_id(vid);
	struct mlx5_vdpa_priv *priv = mlx5_vdpa_find_priv_resource_by_did(did);

	if (priv == NULL) {
		DRV_LOG(ERR, "Invalid device id: %d.", did);
		return -EINVAL;
	}
	if (vring >= (int)priv->caps.max_num_virtio_queues * 2) {
		DRV_LOG(ERR, "Too big vring id: %d.", vring);
		return -E2BIG;
	}
	return mlx5_vdpa_virtq_enable(priv, vring, state);
}

static int
mlx5_vdpa_direct_db_prepare(struct mlx5_vdpa_priv *priv)
{
	int ret;

	if (priv->direct_notifier) {
		ret = rte_vhost_host_notifier_ctrl(priv->vid, false);
		if (ret != 0) {
			DRV_LOG(INFO, "Direct HW notifier FD cannot be "
				"destroyed for device %d: %d.", priv->vid, ret);
			return -1;
		}
		priv->direct_notifier = 0;
	}
	ret = rte_vhost_host_notifier_ctrl(priv->vid, true);
	if (ret != 0)
		DRV_LOG(INFO, "Direct HW notifier FD cannot be configured for"
			" device %d: %d.", priv->vid, ret);
	else
		priv->direct_notifier = 1;
	return 0;
}

static int
mlx5_vdpa_features_set(int vid)
{
	int did = rte_vhost_get_vdpa_device_id(vid);
	struct mlx5_vdpa_priv *priv = mlx5_vdpa_find_priv_resource_by_did(did);
	uint64_t log_base, log_size;
	uint64_t features;
	int ret;

	if (priv == NULL) {
		DRV_LOG(ERR, "Invalid device id: %d.", did);
		return -EINVAL;
	}
	ret = rte_vhost_get_negotiated_features(vid, &features);
	if (ret) {
		DRV_LOG(ERR, "Failed to get negotiated features.");
		return ret;
	}
	if (RTE_VHOST_NEED_LOG(features)) {
		ret = rte_vhost_get_log_base(vid, &log_base, &log_size);
		if (ret) {
			DRV_LOG(ERR, "Failed to get log base.");
			return ret;
		}
		ret = mlx5_vdpa_dirty_bitmap_set(priv, log_base, log_size);
		if (ret) {
			DRV_LOG(ERR, "Failed to set dirty bitmap.");
			return ret;
		}
		DRV_LOG(INFO, "mlx5 vdpa: enabling dirty logging...");
		ret = mlx5_vdpa_logging_enable(priv, 1);
		if (ret) {
			DRV_LOG(ERR, "Failed t enable dirty logging.");
			return ret;
		}
	}
	return 0;
}

static int
mlx5_vdpa_dev_close(int vid)
{
	int did = rte_vhost_get_vdpa_device_id(vid);
	struct mlx5_vdpa_priv *priv = mlx5_vdpa_find_priv_resource_by_did(did);
	int ret = 0;

	if (priv == NULL) {
		DRV_LOG(ERR, "Invalid device id: %d.", did);
		return -1;
	}
	if (priv->configured)
		ret |= mlx5_vdpa_lm_log(priv);
	mlx5_vdpa_cqe_event_unset(priv);
	mlx5_vdpa_steer_unset(priv);
	mlx5_vdpa_virtqs_release(priv);
	mlx5_vdpa_event_qp_global_release(priv);
	mlx5_vdpa_mem_dereg(priv);
	priv->configured = 0;
	priv->vid = 0;
	DRV_LOG(INFO, "vDPA device %d was closed.", vid);
	return ret;
}

static int
mlx5_vdpa_dev_config(int vid)
{
	int did = rte_vhost_get_vdpa_device_id(vid);
	struct mlx5_vdpa_priv *priv = mlx5_vdpa_find_priv_resource_by_did(did);

	if (priv == NULL) {
		DRV_LOG(ERR, "Invalid device id: %d.", did);
		return -EINVAL;
	}
	if (priv->configured && mlx5_vdpa_dev_close(vid)) {
		DRV_LOG(ERR, "Failed to reconfigure vid %d.", vid);
		return -1;
	}
	priv->vid = vid;
	if (mlx5_vdpa_mem_register(priv) || mlx5_vdpa_direct_db_prepare(priv) ||
	    mlx5_vdpa_virtqs_prepare(priv) || mlx5_vdpa_steer_setup(priv) ||
	    mlx5_vdpa_cqe_event_setup(priv)) {
		mlx5_vdpa_dev_close(vid);
		return -1;
	}
	priv->configured = 1;
	DRV_LOG(INFO, "vDPA device %d was configured.", vid);
	return 0;
}

static int
mlx5_vdpa_get_device_fd(int vid)
{
	int did = rte_vhost_get_vdpa_device_id(vid);
	struct mlx5_vdpa_priv *priv = mlx5_vdpa_find_priv_resource_by_did(did);

	if (priv == NULL) {
		DRV_LOG(ERR, "Invalid device id: %d.", did);
		return -EINVAL;
	}
	return priv->ctx->cmd_fd;
}

static int
mlx5_vdpa_get_notify_area(int vid, int qid, uint64_t *offset, uint64_t *size)
{
	int did = rte_vhost_get_vdpa_device_id(vid);
	struct mlx5_vdpa_priv *priv = mlx5_vdpa_find_priv_resource_by_did(did);

	RTE_SET_USED(qid);
	if (priv == NULL) {
		DRV_LOG(ERR, "Invalid device id: %d.", did);
		return -EINVAL;
	}
	if (!priv->var) {
		DRV_LOG(ERR, "VAR was not created for device %d, is the device"
			" configured?.", did);
		return -EINVAL;
	}
	*offset = priv->var->mmap_off;
	*size = priv->var->length;
	return 0;
}

static struct rte_vdpa_dev_ops mlx5_vdpa_ops = {
	.get_queue_num = mlx5_vdpa_get_queue_num,
	.get_features = mlx5_vdpa_get_vdpa_features,
	.get_protocol_features = mlx5_vdpa_get_protocol_features,
	.dev_conf = mlx5_vdpa_dev_config,
	.dev_close = mlx5_vdpa_dev_close,
	.set_vring_state = mlx5_vdpa_set_vring_state,
	.set_features = mlx5_vdpa_features_set,
	.migration_done = NULL,
	.get_vfio_group_fd = NULL,
	.get_vfio_device_fd = mlx5_vdpa_get_device_fd,
	.get_notify_area = mlx5_vdpa_get_notify_area,
};

static struct ibv_device *
mlx5_vdpa_get_ib_device_match(struct rte_pci_addr *addr)
{
	int n;
	struct ibv_device **ibv_list = mlx5_glue->get_device_list(&n);
	struct ibv_device *ibv_match = NULL;

	if (!ibv_list) {
		rte_errno = ENOSYS;
		return NULL;
	}
	while (n-- > 0) {
		struct rte_pci_addr pci_addr;

		DRV_LOG(DEBUG, "Checking device \"%s\"..", ibv_list[n]->name);
		if (mlx5_dev_to_pci_addr(ibv_list[n]->ibdev_path, &pci_addr))
			continue;
		if (rte_pci_addr_cmp(addr, &pci_addr))
			continue;
		ibv_match = ibv_list[n];
		break;
	}
	if (!ibv_match)
		rte_errno = ENOENT;
	mlx5_glue->free_device_list(ibv_list);
	return ibv_match;
}

/* Try to disable ROCE by Netlink\Devlink. */
static int
mlx5_vdpa_nl_roce_disable(const char *addr)
{
	int nlsk_fd = mlx5_nl_init(NETLINK_GENERIC);
	int devlink_id;
	int enable;
	int ret;

	if (nlsk_fd < 0)
		return nlsk_fd;
	devlink_id = mlx5_nl_devlink_family_id_get(nlsk_fd);
	if (devlink_id < 0) {
		ret = devlink_id;
		DRV_LOG(DEBUG, "Failed to get devlink id for ROCE operations by"
			" Netlink.");
		goto close;
	}
	ret = mlx5_nl_enable_roce_get(nlsk_fd, devlink_id, addr, &enable);
	if (ret) {
		DRV_LOG(DEBUG, "Failed to get ROCE enable by Netlink: %d.",
			ret);
		goto close;
	} else if (!enable) {
		DRV_LOG(INFO, "ROCE has already disabled(Netlink).");
		goto close;
	}
	ret = mlx5_nl_enable_roce_set(nlsk_fd, devlink_id, addr, 0);
	if (ret)
		DRV_LOG(DEBUG, "Failed to disable ROCE by Netlink: %d.", ret);
	else
		DRV_LOG(INFO, "ROCE is disabled by Netlink successfully.");
close:
	close(nlsk_fd);
	return ret;
}

/* Try to disable ROCE by sysfs. */
static int
mlx5_vdpa_sys_roce_disable(const char *addr)
{
	FILE *file_o;
	int enable;
	int ret;

	MKSTR(file_p, "/sys/bus/pci/devices/%s/roce_enable", addr);
	file_o = fopen(file_p, "rb");
	if (!file_o) {
		rte_errno = ENOTSUP;
		return -ENOTSUP;
	}
	ret = fscanf(file_o, "%d", &enable);
	if (ret != 1) {
		rte_errno = EINVAL;
		ret = EINVAL;
		goto close;
	} else if (!enable) {
		ret = 0;
		DRV_LOG(INFO, "ROCE has already disabled(sysfs).");
		goto close;
	}
	fclose(file_o);
	file_o = fopen(file_p, "wb");
	if (!file_o) {
		rte_errno = ENOTSUP;
		return -ENOTSUP;
	}
	fprintf(file_o, "0\n");
	ret = 0;
close:
	if (ret)
		DRV_LOG(DEBUG, "Failed to disable ROCE by sysfs: %d.", ret);
	else
		DRV_LOG(INFO, "ROCE is disabled by sysfs successfully.");
	fclose(file_o);
	return ret;
}

#define MLX5_VDPA_MAX_RETRIES 20
#define MLX5_VDPA_USEC 1000
static int
mlx5_vdpa_roce_disable(struct rte_pci_addr *addr, struct ibv_device **ibv)
{
	char addr_name[64] = {0};

	rte_pci_device_name(addr, addr_name, sizeof(addr_name));
	/* Firstly try to disable ROCE by Netlink and fallback to sysfs. */
	if (mlx5_vdpa_nl_roce_disable(addr_name) == 0 ||
	    mlx5_vdpa_sys_roce_disable(addr_name) == 0) {
		/*
		 * Succeed to disable ROCE, wait for the IB device to appear
		 * again after reload.
		 */
		int r;
		struct ibv_device *ibv_new;

		for (r = MLX5_VDPA_MAX_RETRIES; r; r--) {
			ibv_new = mlx5_vdpa_get_ib_device_match(addr);
			if (ibv_new) {
				*ibv = ibv_new;
				return 0;
			}
			usleep(MLX5_VDPA_USEC);
		}
		DRV_LOG(ERR, "Cannot much device %s after ROCE disable, "
			"retries exceed %d", addr_name, MLX5_VDPA_MAX_RETRIES);
		rte_errno = EAGAIN;
	}
	return -rte_errno;
}

/**
 * DPDK callback to register a PCI device.
 *
 * This function spawns vdpa device out of a given PCI device.
 *
 * @param[in] pci_drv
 *   PCI driver structure (mlx5_vpda_driver).
 * @param[in] pci_dev
 *   PCI device information.
 *
 * @return
 *   0 on success, 1 to skip this driver, a negative errno value otherwise
 *   and rte_errno is set.
 */
static int
mlx5_vdpa_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
		    struct rte_pci_device *pci_dev __rte_unused)
{
	struct ibv_device *ibv;
	struct mlx5_vdpa_priv *priv = NULL;
	struct ibv_context *ctx = NULL;
	struct mlx5_hca_attr attr;
	int ret;

	if (mlx5_class_get(pci_dev->device.devargs) != MLX5_CLASS_VDPA) {
		DRV_LOG(DEBUG, "Skip probing - should be probed by other mlx5"
			" driver.");
		return 1;
	}
	ibv = mlx5_vdpa_get_ib_device_match(&pci_dev->addr);
	if (!ibv) {
		DRV_LOG(ERR, "No matching IB device for PCI slot "
			PCI_PRI_FMT ".", pci_dev->addr.domain,
			pci_dev->addr.bus, pci_dev->addr.devid,
			pci_dev->addr.function);
		return -rte_errno;
	} else {
		DRV_LOG(INFO, "PCI information matches for device \"%s\".",
			ibv->name);
	}
	if (mlx5_vdpa_roce_disable(&pci_dev->addr, &ibv) != 0) {
		DRV_LOG(WARNING, "Failed to disable ROCE for \"%s\".",
			ibv->name);
		return -rte_errno;
	}
	ctx = mlx5_glue->dv_open_device(ibv);
	if (!ctx) {
		DRV_LOG(ERR, "Failed to open IB device \"%s\".", ibv->name);
		rte_errno = ENODEV;
		return -rte_errno;
	}
	ret = mlx5_devx_cmd_query_hca_attr(ctx, &attr);
	if (ret) {
		DRV_LOG(ERR, "Unable to read HCA capabilities.");
		rte_errno = ENOTSUP;
		goto error;
	} else if (!attr.vdpa.valid || !attr.vdpa.max_num_virtio_queues) {
		DRV_LOG(ERR, "Not enough capabilities to support vdpa, maybe "
			"old FW/OFED version?");
		rte_errno = ENOTSUP;
		goto error;
	}
	priv = rte_zmalloc("mlx5 vDPA device private", sizeof(*priv) +
			   sizeof(struct mlx5_vdpa_virtq) *
			   attr.vdpa.max_num_virtio_queues * 2,
			   RTE_CACHE_LINE_SIZE);
	if (!priv) {
		DRV_LOG(ERR, "Failed to allocate private memory.");
		rte_errno = ENOMEM;
		goto error;
	}
	priv->caps = attr.vdpa;
	priv->log_max_rqt_size = attr.log_max_rqt_size;
	priv->ctx = ctx;
	priv->dev_addr.pci_addr = pci_dev->addr;
	priv->dev_addr.type = VDPA_ADDR_PCI;
	priv->var = mlx5_glue->dv_alloc_var(ctx, 0);
	if (!priv->var) {
		DRV_LOG(ERR, "Failed to allocate VAR %u.\n", errno);
		goto error;
	}
	priv->id = rte_vdpa_register_device(&priv->dev_addr, &mlx5_vdpa_ops);
	if (priv->id < 0) {
		DRV_LOG(ERR, "Failed to register vDPA device.");
		rte_errno = rte_errno ? rte_errno : EINVAL;
		goto error;
	}
	SLIST_INIT(&priv->mr_list);
	pthread_mutex_lock(&priv_list_lock);
	TAILQ_INSERT_TAIL(&priv_list, priv, next);
	pthread_mutex_unlock(&priv_list_lock);
	return 0;

error:
	if (priv) {
		if (priv->var)
			mlx5_glue->dv_free_var(priv->var);
		rte_free(priv);
	}
	if (ctx)
		mlx5_glue->close_device(ctx);
	return -rte_errno;
}

/**
 * DPDK callback to remove a PCI device.
 *
 * This function removes all vDPA devices belong to a given PCI device.
 *
 * @param[in] pci_dev
 *   Pointer to the PCI device.
 *
 * @return
 *   0 on success, the function cannot fail.
 */
static int
mlx5_vdpa_pci_remove(struct rte_pci_device *pci_dev)
{
	struct mlx5_vdpa_priv *priv = NULL;
	int found = 0;

	pthread_mutex_lock(&priv_list_lock);
	TAILQ_FOREACH(priv, &priv_list, next) {
		if (memcmp(&priv->dev_addr.pci_addr, &pci_dev->addr,
			   sizeof(pci_dev->addr)) == 0) {
			found = 1;
			break;
		}
	}
	if (found)
		TAILQ_REMOVE(&priv_list, priv, next);
	pthread_mutex_unlock(&priv_list_lock);
	if (found) {
		if (priv->configured)
			mlx5_vdpa_dev_close(priv->vid);
		if (priv->var) {
			mlx5_glue->dv_free_var(priv->var);
			priv->var = NULL;
		}
		mlx5_glue->close_device(priv->ctx);
		rte_free(priv);
	}
	return 0;
}

static const struct rte_pci_id mlx5_vdpa_pci_id_map[] = {
	{
		RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
				PCI_DEVICE_ID_MELLANOX_CONNECTX6)
	},
	{
		RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
				PCI_DEVICE_ID_MELLANOX_CONNECTX6VF)
	},
	{
		RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
				PCI_DEVICE_ID_MELLANOX_CONNECTX6DX)
	},
	{
		RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
				PCI_DEVICE_ID_MELLANOX_CONNECTX6DXVF)
	},
	{
		RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
				PCI_DEVICE_ID_MELLANOX_CONNECTX6DXBF)
	},
	{
		.vendor_id = 0
	}
};

static struct rte_pci_driver mlx5_vdpa_driver = {
	.driver = {
		.name = "mlx5_vdpa",
	},
	.id_table = mlx5_vdpa_pci_id_map,
	.probe = mlx5_vdpa_pci_probe,
	.remove = mlx5_vdpa_pci_remove,
	.drv_flags = 0,
};

/**
 * Driver initialization routine.
 */
RTE_INIT(rte_mlx5_vdpa_init)
{
	/* Initialize common log type. */
	mlx5_vdpa_logtype = rte_log_register("pmd.vdpa.mlx5");
	if (mlx5_vdpa_logtype >= 0)
		rte_log_set_level(mlx5_vdpa_logtype, RTE_LOG_NOTICE);
	if (mlx5_glue)
		rte_pci_register(&mlx5_vdpa_driver);
}

RTE_PMD_EXPORT_NAME(net_mlx5_vdpa, __COUNTER__);
RTE_PMD_REGISTER_PCI_TABLE(net_mlx5_vdpa, mlx5_vdpa_pci_id_map);
RTE_PMD_REGISTER_KMOD_DEP(net_mlx5_vdpa, "* ib_uverbs & mlx5_core & mlx5_ib");