Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 828 insertions, 0 deletions

diff --git a/src/spdk/dpdk/lib/librte_vhost/vhost.h b/src/spdk/dpdk/lib/librte_vhost/vhost.h
new file mode 100644
index 000000000..df98d15de
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_vhost/vhost.h
@@ -0,0 +1,828 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2018 Intel Corporation
+ */
+
+#ifndef _VHOST_NET_CDEV_H_
+#define _VHOST_NET_CDEV_H_
+#include <stdint.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <unistd.h>
+#include <linux/vhost.h>
+#include <linux/virtio_net.h>
+#include <sys/socket.h>
+#include <linux/if.h>
+
+#include <rte_log.h>
+#include <rte_ether.h>
+#include <rte_rwlock.h>
+#include <rte_malloc.h>
+
+#include "rte_vhost.h"
+#include "rte_vdpa.h"
+
+/* Used to indicate that the device is running on a data core */
+#define VIRTIO_DEV_RUNNING 1
+/* Used to indicate that the device is ready to operate */
+#define VIRTIO_DEV_READY 2
+/* Used to indicate that the built-in vhost net device backend is enabled */
+#define VIRTIO_DEV_BUILTIN_VIRTIO_NET 4
+/* Used to indicate that the device has its own data path and configured */
+#define VIRTIO_DEV_VDPA_CONFIGURED 8
+
+/* Backend value set by guest. */
+#define VIRTIO_DEV_STOPPED -1
+
+#define BUF_VECTOR_MAX 256
+
+#define VHOST_LOG_CACHE_NR 32
+
+#define PACKED_DESC_ENQUEUE_USED_FLAG(w)	\
+	((w) ? (VRING_DESC_F_AVAIL | VRING_DESC_F_USED | VRING_DESC_F_WRITE) : \
+		VRING_DESC_F_WRITE)
+#define PACKED_DESC_DEQUEUE_USED_FLAG(w)	\
+	((w) ? (VRING_DESC_F_AVAIL | VRING_DESC_F_USED) : 0x0)
+#define PACKED_DESC_SINGLE_DEQUEUE_FLAG (VRING_DESC_F_NEXT | \
+					 VRING_DESC_F_INDIRECT)
+
+#define PACKED_BATCH_SIZE (RTE_CACHE_LINE_SIZE / \
+			    sizeof(struct vring_packed_desc))
+#define PACKED_BATCH_MASK (PACKED_BATCH_SIZE - 1)
+
+#ifdef VHOST_GCC_UNROLL_PRAGMA
+#define vhost_for_each_try_unroll(iter, val, size) _Pragma("GCC unroll 4") \
+	for (iter = val; iter < size; iter++)
+#endif
+
+#ifdef VHOST_CLANG_UNROLL_PRAGMA
+#define vhost_for_each_try_unroll(iter, val, size) _Pragma("unroll 4") \
+	for (iter = val; iter < size; iter++)
+#endif
+
+#ifdef VHOST_ICC_UNROLL_PRAGMA
+#define vhost_for_each_try_unroll(iter, val, size) _Pragma("unroll (4)") \
+	for (iter = val; iter < size; iter++)
+#endif
+
+#ifndef vhost_for_each_try_unroll
+#define vhost_for_each_try_unroll(iter, val, num) \
+	for (iter = val; iter < num; iter++)
+#endif
+
+/**
+ * Structure contains buffer address, length and descriptor index
+ * from vring to do scatter RX.
+ */
+struct buf_vector {
+	uint64_t buf_iova;
+	uint64_t buf_addr;
+	uint32_t buf_len;
+	uint32_t desc_idx;
+};
+
+/*
+ * A structure to hold some fields needed in zero copy code path,
+ * mainly for associating an mbuf with the right desc_idx.
+ */
+struct zcopy_mbuf {
+	struct rte_mbuf *mbuf;
+	uint32_t desc_idx;
+	uint16_t desc_count;
+	uint16_t in_use;
+
+	TAILQ_ENTRY(zcopy_mbuf) next;
+};
+TAILQ_HEAD(zcopy_mbuf_list, zcopy_mbuf);
+
+/*
+ * Structure contains the info for each batched memory copy.
+ */
+struct batch_copy_elem {
+	void *dst;
+	void *src;
+	uint32_t len;
+	uint64_t log_addr;
+};
+
+/*
+ * Structure that contains the info for batched dirty logging.
+ */
+struct log_cache_entry {
+	uint32_t offset;
+	unsigned long val;
+};
+
+struct vring_used_elem_packed {
+	uint16_t id;
+	uint16_t flags;
+	uint32_t len;
+	uint32_t count;
+};
+
+/**
+ * Structure contains variables relevant to RX/TX virtqueues.
+ */
+struct vhost_virtqueue {
+	union {
+		struct vring_desc	*desc;
+		struct vring_packed_desc   *desc_packed;
+	};
+	union {
+		struct vring_avail	*avail;
+		struct vring_packed_desc_event *driver_event;
+	};
+	union {
+		struct vring_used	*used;
+		struct vring_packed_desc_event *device_event;
+	};
+	uint32_t		size;
+
+	uint16_t		last_avail_idx;
+	uint16_t		last_used_idx;
+	/* Last used index we notify to front end. */
+	uint16_t		signalled_used;
+	bool			signalled_used_valid;
+#define VIRTIO_INVALID_EVENTFD		(-1)
+#define VIRTIO_UNINITIALIZED_EVENTFD	(-2)
+
+	/* Backend value to determine if device should started/stopped */
+	int			backend;
+	int			enabled;
+	int			access_ok;
+	rte_spinlock_t		access_lock;
+
+	/* Used to notify the guest (trigger interrupt) */
+	int			callfd;
+	/* Currently unused as polling mode is enabled */
+	int			kickfd;
+
+	/* Physical address of used ring, for logging */
+	uint64_t		log_guest_addr;
+
+	/* inflight share memory info */
+	union {
+		struct rte_vhost_inflight_info_split *inflight_split;
+		struct rte_vhost_inflight_info_packed *inflight_packed;
+	};
+	struct rte_vhost_resubmit_info *resubmit_inflight;
+	uint64_t		global_counter;
+
+	uint16_t		nr_zmbuf;
+	uint16_t		zmbuf_size;
+	uint16_t		last_zmbuf_idx;
+	struct zcopy_mbuf	*zmbufs;
+	struct zcopy_mbuf_list	zmbuf_list;
+
+	union {
+		struct vring_used_elem  *shadow_used_split;
+		struct vring_used_elem_packed *shadow_used_packed;
+	};
+	uint16_t                shadow_used_idx;
+	/* Record packed ring enqueue latest desc cache aligned index */
+	uint16_t		shadow_aligned_idx;
+	/* Record packed ring first dequeue desc index */
+	uint16_t		shadow_last_used_idx;
+	struct vhost_vring_addr ring_addrs;
+
+	struct batch_copy_elem	*batch_copy_elems;
+	uint16_t		batch_copy_nb_elems;
+	bool			used_wrap_counter;
+	bool			avail_wrap_counter;
+
+	struct log_cache_entry log_cache[VHOST_LOG_CACHE_NR];
+	uint16_t log_cache_nb_elem;
+
+	rte_rwlock_t	iotlb_lock;
+	rte_rwlock_t	iotlb_pending_lock;
+	struct rte_mempool *iotlb_pool;
+	TAILQ_HEAD(, vhost_iotlb_entry) iotlb_list;
+	int				iotlb_cache_nr;
+	TAILQ_HEAD(, vhost_iotlb_entry) iotlb_pending_list;
+} __rte_cache_aligned;
+
+/* Old kernels have no such macros defined */
+#ifndef VIRTIO_NET_F_GUEST_ANNOUNCE
+ #define VIRTIO_NET_F_GUEST_ANNOUNCE 21
+#endif
+
+#ifndef VIRTIO_NET_F_MQ
+ #define VIRTIO_NET_F_MQ		22
+#endif
+
+#define VHOST_MAX_VRING			0x100
+#define VHOST_MAX_QUEUE_PAIRS		0x80
+
+#ifndef VIRTIO_NET_F_MTU
+ #define VIRTIO_NET_F_MTU 3
+#endif
+
+#ifndef VIRTIO_F_ANY_LAYOUT
+ #define VIRTIO_F_ANY_LAYOUT		27
+#endif
+
+/* Declare IOMMU related bits for older kernels */
+#ifndef VIRTIO_F_IOMMU_PLATFORM
+
+#define VIRTIO_F_IOMMU_PLATFORM 33
+
+struct vhost_iotlb_msg {
+	__u64 iova;
+	__u64 size;
+	__u64 uaddr;
+#define VHOST_ACCESS_RO      0x1
+#define VHOST_ACCESS_WO      0x2
+#define VHOST_ACCESS_RW      0x3
+	__u8 perm;
+#define VHOST_IOTLB_MISS           1
+#define VHOST_IOTLB_UPDATE         2
+#define VHOST_IOTLB_INVALIDATE     3
+#define VHOST_IOTLB_ACCESS_FAIL    4
+	__u8 type;
+};
+
+#define VHOST_IOTLB_MSG 0x1
+
+struct vhost_msg {
+	int type;
+	union {
+		struct vhost_iotlb_msg iotlb;
+		__u8 padding[64];
+	};
+};
+#endif
+
+/*
+ * Define virtio 1.0 for older kernels
+ */
+#ifndef VIRTIO_F_VERSION_1
+ #define VIRTIO_F_VERSION_1 32
+#endif
+
+/* Declare packed ring related bits for older kernels */
+#ifndef VIRTIO_F_RING_PACKED
+
+#define VIRTIO_F_RING_PACKED 34
+
+struct vring_packed_desc {
+	uint64_t addr;
+	uint32_t len;
+	uint16_t id;
+	uint16_t flags;
+};
+
+struct vring_packed_desc_event {
+	uint16_t off_wrap;
+	uint16_t flags;
+};
+#endif
+
+/*
+ * Declare below packed ring defines unconditionally
+ * as Kernel header might use different names.
+ */
+#define VRING_DESC_F_AVAIL	(1ULL << 7)
+#define VRING_DESC_F_USED	(1ULL << 15)
+
+#define VRING_EVENT_F_ENABLE 0x0
+#define VRING_EVENT_F_DISABLE 0x1
+#define VRING_EVENT_F_DESC 0x2
+
+/*
+ * Available and used descs are in same order
+ */
+#ifndef VIRTIO_F_IN_ORDER
+#define VIRTIO_F_IN_ORDER      35
+#endif
+
+/* Features supported by this builtin vhost-user net driver. */
+#define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
+				(1ULL << VIRTIO_F_ANY_LAYOUT) | \
+				(1ULL << VIRTIO_NET_F_CTRL_VQ) | \
+				(1ULL << VIRTIO_NET_F_CTRL_RX) | \
+				(1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
+				(1ULL << VIRTIO_NET_F_MQ)      | \
+				(1ULL << VIRTIO_F_VERSION_1)   | \
+				(1ULL << VHOST_F_LOG_ALL)      | \
+				(1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
+				(1ULL << VIRTIO_NET_F_GSO) | \
+				(1ULL << VIRTIO_NET_F_HOST_TSO4) | \
+				(1ULL << VIRTIO_NET_F_HOST_TSO6) | \
+				(1ULL << VIRTIO_NET_F_HOST_UFO) | \
+				(1ULL << VIRTIO_NET_F_HOST_ECN) | \
+				(1ULL << VIRTIO_NET_F_CSUM)    | \
+				(1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
+				(1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
+				(1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
+				(1ULL << VIRTIO_NET_F_GUEST_UFO) | \
+				(1ULL << VIRTIO_NET_F_GUEST_ECN) | \
+				(1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
+				(1ULL << VIRTIO_RING_F_EVENT_IDX) | \
+				(1ULL << VIRTIO_NET_F_MTU)  | \
+				(1ULL << VIRTIO_F_IN_ORDER) | \
+				(1ULL << VIRTIO_F_IOMMU_PLATFORM) | \
+				(1ULL << VIRTIO_F_RING_PACKED))
+
+
+struct guest_page {
+	uint64_t guest_phys_addr;
+	uint64_t host_phys_addr;
+	uint64_t size;
+};
+
+struct inflight_mem_info {
+	int		fd;
+	void		*addr;
+	uint64_t	size;
+};
+
+/**
+ * Device structure contains all configuration information relating
+ * to the device.
+ */
+struct virtio_net {
+	/* Frontend (QEMU) memory and memory region information */
+	struct rte_vhost_memory	*mem;
+	uint64_t		features;
+	uint64_t		protocol_features;
+	int			vid;
+	uint32_t		flags;
+	uint16_t		vhost_hlen;
+	/* to tell if we need broadcast rarp packet */
+	int16_t			broadcast_rarp;
+	uint32_t		nr_vring;
+	int			dequeue_zero_copy;
+	int			extbuf;
+	int			linearbuf;
+	struct vhost_virtqueue	*virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];
+	struct inflight_mem_info *inflight_info;
+#define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
+	char			ifname[IF_NAME_SZ];
+	uint64_t		log_size;
+	uint64_t		log_base;
+	uint64_t		log_addr;
+	struct rte_ether_addr	mac;
+	uint16_t		mtu;
+
+	struct vhost_device_ops const *notify_ops;
+
+	uint32_t		nr_guest_pages;
+	uint32_t		max_guest_pages;
+	struct guest_page       *guest_pages;
+
+	int			slave_req_fd;
+	rte_spinlock_t		slave_req_lock;
+
+	int			postcopy_ufd;
+	int			postcopy_listening;
+
+	/*
+	 * Device id to identify a specific backend device.
+	 * It's set to -1 for the default software implementation.
+	 */
+	int			vdpa_dev_id;
+
+	/* context data for the external message handlers */
+	void			*extern_data;
+	/* pre and post vhost user message handlers for the device */
+	struct rte_vhost_user_extern_ops extern_ops;
+} __rte_cache_aligned;
+
+static __rte_always_inline bool
+vq_is_packed(struct virtio_net *dev)
+{
+	return dev->features & (1ull << VIRTIO_F_RING_PACKED);
+}
+
+static inline bool
+desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
+{
+	uint16_t flags = __atomic_load_n(&desc->flags, __ATOMIC_ACQUIRE);
+
+	return wrap_counter == !!(flags & VRING_DESC_F_AVAIL) &&
+		wrap_counter != !!(flags & VRING_DESC_F_USED);
+}
+
+static inline void
+vq_inc_last_used_packed(struct vhost_virtqueue *vq, uint16_t num)
+{
+	vq->last_used_idx += num;
+	if (vq->last_used_idx >= vq->size) {
+		vq->used_wrap_counter ^= 1;
+		vq->last_used_idx -= vq->size;
+	}
+}
+
+static inline void
+vq_inc_last_avail_packed(struct vhost_virtqueue *vq, uint16_t num)
+{
+	vq->last_avail_idx += num;
+	if (vq->last_avail_idx >= vq->size) {
+		vq->avail_wrap_counter ^= 1;
+		vq->last_avail_idx -= vq->size;
+	}
+}
+
+void __vhost_log_cache_write(struct virtio_net *dev,
+		struct vhost_virtqueue *vq,
+		uint64_t addr, uint64_t len);
+void __vhost_log_cache_write_iova(struct virtio_net *dev,
+		struct vhost_virtqueue *vq,
+		uint64_t iova, uint64_t len);
+void __vhost_log_cache_sync(struct virtio_net *dev,
+		struct vhost_virtqueue *vq);
+void __vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len);
+void __vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
+			    uint64_t iova, uint64_t len);
+
+static __rte_always_inline void
+vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
+{
+	if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
+		__vhost_log_write(dev, addr, len);
+}
+
+static __rte_always_inline void
+vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+	if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
+		__vhost_log_cache_sync(dev, vq);
+}
+
+static __rte_always_inline void
+vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
+			uint64_t addr, uint64_t len)
+{
+	if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
+		__vhost_log_cache_write(dev, vq, addr, len);
+}
+
+static __rte_always_inline void
+vhost_log_cache_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
+			uint64_t offset, uint64_t len)
+{
+	if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) {
+		if (unlikely(vq->log_guest_addr == 0))
+			return;
+		__vhost_log_cache_write(dev, vq, vq->log_guest_addr + offset,
+					len);
+	}
+}
+
+static __rte_always_inline void
+vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
+		     uint64_t offset, uint64_t len)
+{
+	if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) {
+		if (unlikely(vq->log_guest_addr == 0))
+			return;
+		__vhost_log_write(dev, vq->log_guest_addr + offset, len);
+	}
+}
+
+static __rte_always_inline void
+vhost_log_cache_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
+			   uint64_t iova, uint64_t len)
+{
+	if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL))))
+		return;
+
+	if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+		__vhost_log_cache_write_iova(dev, vq, iova, len);
+	else
+		__vhost_log_cache_write(dev, vq, iova, len);
+}
+
+static __rte_always_inline void
+vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
+			   uint64_t iova, uint64_t len)
+{
+	if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL))))
+		return;
+
+	if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+		__vhost_log_write_iova(dev, vq, iova, len);
+	else
+		__vhost_log_write(dev, iova, len);
+}
+
+extern int vhost_config_log_level;
+extern int vhost_data_log_level;
+
+#define VHOST_LOG_CONFIG(level, fmt, args...)			\
+	rte_log(RTE_LOG_ ## level, vhost_config_log_level,	\
+		"VHOST_CONFIG: " fmt, ##args)
+
+#define VHOST_LOG_DATA(level, fmt, args...) \
+	(void)((RTE_LOG_ ## level <= RTE_LOG_DP_LEVEL) ?	\
+	 rte_log(RTE_LOG_ ## level,  vhost_data_log_level,	\
+		"VHOST_DATA : " fmt, ##args) :			\
+	 0)
+
+#ifdef RTE_LIBRTE_VHOST_DEBUG
+#define VHOST_MAX_PRINT_BUFF 6072
+#define PRINT_PACKET(device, addr, size, header) do { \
+	char *pkt_addr = (char *)(addr); \
+	unsigned int index; \
+	char packet[VHOST_MAX_PRINT_BUFF]; \
+	\
+	if ((header)) \
+		snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Header size %d: ", (device->vid), (size)); \
+	else \
+		snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Packet size %d: ", (device->vid), (size)); \
+	for (index = 0; index < (size); index++) { \
+		snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), \
+			"%02hhx ", pkt_addr[index]); \
+	} \
+	snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), "\n"); \
+	\
+	VHOST_LOG_DATA(DEBUG, "%s", packet); \
+} while (0)
+#else
+#define PRINT_PACKET(device, addr, size, header) do {} while (0)
+#endif
+
+#define MAX_VHOST_DEVICE	1024
+extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
+
+#define VHOST_BINARY_SEARCH_THRESH 256
+
+static __rte_always_inline int guest_page_addrcmp(const void *p1,
+						const void *p2)
+{
+	const struct guest_page *page1 = (const struct guest_page *)p1;
+	const struct guest_page *page2 = (const struct guest_page *)p2;
+
+	if (page1->guest_phys_addr > page2->guest_phys_addr)
+		return 1;
+	if (page1->guest_phys_addr < page2->guest_phys_addr)
+		return -1;
+
+	return 0;
+}
+
+/* Convert guest physical address to host physical address */
+static __rte_always_inline rte_iova_t
+gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size)
+{
+	uint32_t i;
+	struct guest_page *page;
+	struct guest_page key;
+
+	if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) {
+		key.guest_phys_addr = gpa;
+		page = bsearch(&key, dev->guest_pages, dev->nr_guest_pages,
+			       sizeof(struct guest_page), guest_page_addrcmp);
+		if (page) {
+			if (gpa + size < page->guest_phys_addr + page->size)
+				return gpa - page->guest_phys_addr +
+					page->host_phys_addr;
+		}
+	} else {
+		for (i = 0; i < dev->nr_guest_pages; i++) {
+			page = &dev->guest_pages[i];
+
+			if (gpa >= page->guest_phys_addr &&
+			    gpa + size < page->guest_phys_addr +
+			    page->size)
+				return gpa - page->guest_phys_addr +
+				       page->host_phys_addr;
+		}
+	}
+
+	return 0;
+}
+
+static __rte_always_inline uint64_t
+hva_to_gpa(struct virtio_net *dev, uint64_t vva, uint64_t len)
+{
+	struct rte_vhost_mem_region *r;
+	uint32_t i;
+
+	if (unlikely(!dev || !dev->mem))
+		return 0;
+
+	for (i = 0; i < dev->mem->nregions; i++) {
+		r = &dev->mem->regions[i];
+
+		if (vva >= r->host_user_addr &&
+		    vva + len <  r->host_user_addr + r->size) {
+			return r->guest_phys_addr + vva - r->host_user_addr;
+		}
+	}
+	return 0;
+}
+
+static __rte_always_inline struct virtio_net *
+get_device(int vid)
+{
+	struct virtio_net *dev = vhost_devices[vid];
+
+	if (unlikely(!dev)) {
+		VHOST_LOG_CONFIG(ERR,
+			"(%d) device not found.\n", vid);
+	}
+
+	return dev;
+}
+
+int vhost_new_device(void);
+void cleanup_device(struct virtio_net *dev, int destroy);
+void reset_device(struct virtio_net *dev);
+void vhost_destroy_device(int);
+void vhost_destroy_device_notify(struct virtio_net *dev);
+
+void cleanup_vq(struct vhost_virtqueue *vq, int destroy);
+void cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq);
+void free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq);
+
+int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx);
+
+void vhost_attach_vdpa_device(int vid, int did);
+
+void vhost_set_ifname(int, const char *if_name, unsigned int if_len);
+void vhost_enable_dequeue_zero_copy(int vid);
+void vhost_set_builtin_virtio_net(int vid, bool enable);
+void vhost_enable_extbuf(int vid);
+void vhost_enable_linearbuf(int vid);
+
+struct vhost_device_ops const *vhost_driver_callback_get(const char *path);
+
+/*
+ * Backend-specific cleanup.
+ *
+ * TODO: fix it; we have one backend now
+ */
+void vhost_backend_cleanup(struct virtio_net *dev);
+
+uint64_t __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
+			uint64_t iova, uint64_t *len, uint8_t perm);
+void *vhost_alloc_copy_ind_table(struct virtio_net *dev,
+			struct vhost_virtqueue *vq,
+			uint64_t desc_addr, uint64_t desc_len);
+int vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq);
+uint64_t translate_log_addr(struct virtio_net *dev, struct vhost_virtqueue *vq,
+		uint64_t log_addr);
+void vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq);
+
+static __rte_always_inline uint64_t
+vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
+			uint64_t iova, uint64_t *len, uint8_t perm)
+{
+	if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
+		return rte_vhost_va_from_guest_pa(dev->mem, iova, len);
+
+	return __vhost_iova_to_vva(dev, vq, iova, len, perm);
+}
+
+#define vhost_avail_event(vr) \
+	(*(volatile uint16_t*)&(vr)->used->ring[(vr)->size])
+#define vhost_used_event(vr) \
+	(*(volatile uint16_t*)&(vr)->avail->ring[(vr)->size])
+
+/*
+ * The following is used with VIRTIO_RING_F_EVENT_IDX.
+ * Assuming a given event_idx value from the other size, if we have
+ * just incremented index from old to new_idx, should we trigger an
+ * event?
+ */
+static __rte_always_inline int
+vhost_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
+{
+	return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old);
+}
+
+static __rte_always_inline void
+vhost_vring_call_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+	/* Flush used->idx update before we read avail->flags. */
+	rte_smp_mb();
+
+	/* Don't kick guest if we don't reach index specified by guest. */
+	if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
+		uint16_t old = vq->signalled_used;
+		uint16_t new = vq->last_used_idx;
+		bool signalled_used_valid = vq->signalled_used_valid;
+
+		vq->signalled_used = new;
+		vq->signalled_used_valid = true;
+
+		VHOST_LOG_DATA(DEBUG, "%s: used_event_idx=%d, old=%d, new=%d\n",
+			__func__,
+			vhost_used_event(vq),
+			old, new);
+
+		if ((vhost_need_event(vhost_used_event(vq), new, old) &&
+					(vq->callfd >= 0)) ||
+				unlikely(!signalled_used_valid)) {
+			eventfd_write(vq->callfd, (eventfd_t) 1);
+			if (dev->notify_ops->guest_notified)
+				dev->notify_ops->guest_notified(dev->vid);
+		}
+	} else {
+		/* Kick the guest if necessary. */
+		if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
+				&& (vq->callfd >= 0)) {
+			eventfd_write(vq->callfd, (eventfd_t)1);
+			if (dev->notify_ops->guest_notified)
+				dev->notify_ops->guest_notified(dev->vid);
+		}
+	}
+}
+
+static __rte_always_inline void
+vhost_vring_call_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+	uint16_t old, new, off, off_wrap;
+	bool signalled_used_valid, kick = false;
+
+	/* Flush used desc update. */
+	rte_smp_mb();
+
+	if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
+		if (vq->driver_event->flags !=
+				VRING_EVENT_F_DISABLE)
+			kick = true;
+		goto kick;
+	}
+
+	old = vq->signalled_used;
+	new = vq->last_used_idx;
+	vq->signalled_used = new;
+	signalled_used_valid = vq->signalled_used_valid;
+	vq->signalled_used_valid = true;
+
+	if (vq->driver_event->flags != VRING_EVENT_F_DESC) {
+		if (vq->driver_event->flags != VRING_EVENT_F_DISABLE)
+			kick = true;
+		goto kick;
+	}
+
+	if (unlikely(!signalled_used_valid)) {
+		kick = true;
+		goto kick;
+	}
+
+	rte_smp_rmb();
+
+	off_wrap = vq->driver_event->off_wrap;
+	off = off_wrap & ~(1 << 15);
+
+	if (new <= old)
+		old -= vq->size;
+
+	if (vq->used_wrap_counter != off_wrap >> 15)
+		off -= vq->size;
+
+	if (vhost_need_event(off, new, old))
+		kick = true;
+kick:
+	if (kick) {
+		eventfd_write(vq->callfd, (eventfd_t)1);
+		if (dev->notify_ops->guest_notified)
+			dev->notify_ops->guest_notified(dev->vid);
+	}
+}
+
+static __rte_always_inline void
+free_ind_table(void *idesc)
+{
+	rte_free(idesc);
+}
+
+static __rte_always_inline void
+restore_mbuf(struct rte_mbuf *m)
+{
+	uint32_t mbuf_size, priv_size;
+
+	while (m) {
+		priv_size = rte_pktmbuf_priv_size(m->pool);
+		mbuf_size = sizeof(struct rte_mbuf) + priv_size;
+		/* start of buffer is after mbuf structure and priv data */
+
+		m->buf_addr = (char *)m + mbuf_size;
+		m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size;
+		m = m->next;
+	}
+}
+
+static __rte_always_inline bool
+mbuf_is_consumed(struct rte_mbuf *m)
+{
+	while (m) {
+		if (rte_mbuf_refcnt_read(m) > 1)
+			return false;
+		m = m->next;
+	}
+
+	return true;
+}
+
+static __rte_always_inline void
+put_zmbuf(struct zcopy_mbuf *zmbuf)
+{
+	zmbuf->in_use = 0;
+}
+
+#endif /* _VHOST_NET_CDEV_H_ */