9b91fbd6ec
Previously, vhost library lacks the support to the vhost backend other than net such as adding private data or registering vhost-user message handlers. This patch fills the gap by adding data pointer and vhost-user pre and post message handlers to vhost library. Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com> Acked-by: Jay Zhou <jianjay.zhou@huawei.com> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
498 lines
13 KiB
C
498 lines
13 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2010-2018 Intel Corporation
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*/
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#ifndef _VHOST_NET_CDEV_H_
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#define _VHOST_NET_CDEV_H_
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#include <stdint.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <unistd.h>
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#include <linux/vhost.h>
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#include <linux/virtio_net.h>
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#include <sys/socket.h>
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#include <linux/if.h>
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#include <rte_log.h>
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#include <rte_ether.h>
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#include <rte_rwlock.h>
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#include "rte_vhost.h"
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#include "rte_vdpa.h"
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/* Used to indicate that the device is running on a data core */
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#define VIRTIO_DEV_RUNNING 1
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/* Used to indicate that the device is ready to operate */
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#define VIRTIO_DEV_READY 2
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/* Used to indicate that the built-in vhost net device backend is enabled */
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#define VIRTIO_DEV_BUILTIN_VIRTIO_NET 4
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/* Used to indicate that the device has its own data path and configured */
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#define VIRTIO_DEV_VDPA_CONFIGURED 8
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/* Backend value set by guest. */
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#define VIRTIO_DEV_STOPPED -1
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#define BUF_VECTOR_MAX 256
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/**
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* Structure contains buffer address, length and descriptor index
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* from vring to do scatter RX.
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*/
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struct buf_vector {
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uint64_t buf_addr;
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uint32_t buf_len;
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uint32_t desc_idx;
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};
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/*
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* A structure to hold some fields needed in zero copy code path,
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* mainly for associating an mbuf with the right desc_idx.
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*/
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struct zcopy_mbuf {
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struct rte_mbuf *mbuf;
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uint32_t desc_idx;
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uint16_t in_use;
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TAILQ_ENTRY(zcopy_mbuf) next;
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};
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TAILQ_HEAD(zcopy_mbuf_list, zcopy_mbuf);
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/*
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* Structure contains the info for each batched memory copy.
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*/
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struct batch_copy_elem {
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void *dst;
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void *src;
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uint32_t len;
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uint64_t log_addr;
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};
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/**
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* Structure contains variables relevant to RX/TX virtqueues.
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*/
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struct vhost_virtqueue {
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struct vring_desc *desc;
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struct vring_avail *avail;
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struct vring_used *used;
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uint32_t size;
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uint16_t last_avail_idx;
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uint16_t last_used_idx;
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/* Last used index we notify to front end. */
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uint16_t signalled_used;
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#define VIRTIO_INVALID_EVENTFD (-1)
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#define VIRTIO_UNINITIALIZED_EVENTFD (-2)
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/* Backend value to determine if device should started/stopped */
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int backend;
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int enabled;
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int access_ok;
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rte_spinlock_t access_lock;
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/* Used to notify the guest (trigger interrupt) */
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int callfd;
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/* Currently unused as polling mode is enabled */
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int kickfd;
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/* Physical address of used ring, for logging */
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uint64_t log_guest_addr;
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uint16_t nr_zmbuf;
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uint16_t zmbuf_size;
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uint16_t last_zmbuf_idx;
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struct zcopy_mbuf *zmbufs;
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struct zcopy_mbuf_list zmbuf_list;
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struct vring_used_elem *shadow_used_ring;
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uint16_t shadow_used_idx;
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struct vhost_vring_addr ring_addrs;
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struct batch_copy_elem *batch_copy_elems;
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uint16_t batch_copy_nb_elems;
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rte_rwlock_t iotlb_lock;
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rte_rwlock_t iotlb_pending_lock;
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struct rte_mempool *iotlb_pool;
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TAILQ_HEAD(, vhost_iotlb_entry) iotlb_list;
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int iotlb_cache_nr;
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TAILQ_HEAD(, vhost_iotlb_entry) iotlb_pending_list;
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} __rte_cache_aligned;
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/* Old kernels have no such macros defined */
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#ifndef VIRTIO_NET_F_GUEST_ANNOUNCE
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#define VIRTIO_NET_F_GUEST_ANNOUNCE 21
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#endif
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#ifndef VIRTIO_NET_F_MQ
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#define VIRTIO_NET_F_MQ 22
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#endif
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#define VHOST_MAX_VRING 0x100
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#define VHOST_MAX_QUEUE_PAIRS 0x80
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#ifndef VIRTIO_NET_F_MTU
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#define VIRTIO_NET_F_MTU 3
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#endif
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#ifndef VIRTIO_F_ANY_LAYOUT
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#define VIRTIO_F_ANY_LAYOUT 27
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#endif
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/* Declare IOMMU related bits for older kernels */
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#ifndef VIRTIO_F_IOMMU_PLATFORM
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#define VIRTIO_F_IOMMU_PLATFORM 33
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struct vhost_iotlb_msg {
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__u64 iova;
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__u64 size;
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__u64 uaddr;
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#define VHOST_ACCESS_RO 0x1
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#define VHOST_ACCESS_WO 0x2
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#define VHOST_ACCESS_RW 0x3
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__u8 perm;
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#define VHOST_IOTLB_MISS 1
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#define VHOST_IOTLB_UPDATE 2
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#define VHOST_IOTLB_INVALIDATE 3
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#define VHOST_IOTLB_ACCESS_FAIL 4
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__u8 type;
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};
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#define VHOST_IOTLB_MSG 0x1
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struct vhost_msg {
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int type;
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union {
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struct vhost_iotlb_msg iotlb;
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__u8 padding[64];
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};
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};
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#endif
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/*
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* Define virtio 1.0 for older kernels
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*/
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#ifndef VIRTIO_F_VERSION_1
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#define VIRTIO_F_VERSION_1 32
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#endif
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/* Features supported by this builtin vhost-user net driver. */
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#define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
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(1ULL << VIRTIO_F_ANY_LAYOUT) | \
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(1ULL << VIRTIO_NET_F_CTRL_VQ) | \
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(1ULL << VIRTIO_NET_F_CTRL_RX) | \
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(1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
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(1ULL << VIRTIO_NET_F_MQ) | \
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(1ULL << VIRTIO_F_VERSION_1) | \
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(1ULL << VHOST_F_LOG_ALL) | \
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(1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
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(1ULL << VIRTIO_NET_F_GSO) | \
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(1ULL << VIRTIO_NET_F_HOST_TSO4) | \
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(1ULL << VIRTIO_NET_F_HOST_TSO6) | \
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(1ULL << VIRTIO_NET_F_HOST_UFO) | \
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(1ULL << VIRTIO_NET_F_HOST_ECN) | \
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(1ULL << VIRTIO_NET_F_CSUM) | \
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(1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
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(1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
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(1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
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(1ULL << VIRTIO_NET_F_GUEST_UFO) | \
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(1ULL << VIRTIO_NET_F_GUEST_ECN) | \
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(1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
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(1ULL << VIRTIO_RING_F_EVENT_IDX) | \
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(1ULL << VIRTIO_NET_F_MTU) | \
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(1ULL << VIRTIO_F_IOMMU_PLATFORM))
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struct guest_page {
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uint64_t guest_phys_addr;
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uint64_t host_phys_addr;
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uint64_t size;
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};
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/**
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* function prototype for the vhost backend to handler specific vhost user
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* messages prior to the master message handling
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*
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* @param vid
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* vhost device id
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* @param msg
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* Message pointer.
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* @param require_reply
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* If the handler requires sending a reply, this varaible shall be written 1,
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* otherwise 0.
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* @param skip_master
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* If the handler requires skipping the master message handling, this variable
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* shall be written 1, otherwise 0.
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* @return
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* 0 on success, -1 on failure
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*/
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typedef int (*vhost_msg_pre_handle)(int vid, void *msg,
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uint32_t *require_reply, uint32_t *skip_master);
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/**
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* function prototype for the vhost backend to handler specific vhost user
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* messages after the master message handling is done
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*
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* @param vid
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* vhost device id
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* @param msg
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* Message pointer.
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* @param require_reply
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* If the handler requires sending a reply, this varaible shall be written 1,
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* otherwise 0.
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* @return
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* 0 on success, -1 on failure
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*/
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typedef int (*vhost_msg_post_handle)(int vid, void *msg,
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uint32_t *require_reply);
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/**
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* pre and post vhost user message handlers
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*/
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struct vhost_user_extern_ops {
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vhost_msg_pre_handle pre_msg_handle;
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vhost_msg_post_handle post_msg_handle;
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};
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/**
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* Device structure contains all configuration information relating
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* to the device.
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*/
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struct virtio_net {
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/* Frontend (QEMU) memory and memory region information */
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struct rte_vhost_memory *mem;
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uint64_t features;
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uint64_t protocol_features;
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int vid;
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uint32_t flags;
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uint16_t vhost_hlen;
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/* to tell if we need broadcast rarp packet */
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rte_atomic16_t broadcast_rarp;
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uint32_t nr_vring;
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int dequeue_zero_copy;
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struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];
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#define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
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char ifname[IF_NAME_SZ];
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uint64_t log_size;
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uint64_t log_base;
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uint64_t log_addr;
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struct ether_addr mac;
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uint16_t mtu;
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struct vhost_device_ops const *notify_ops;
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uint32_t nr_guest_pages;
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uint32_t max_guest_pages;
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struct guest_page *guest_pages;
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int slave_req_fd;
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/*
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* Device id to identify a specific backend device.
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* It's set to -1 for the default software implementation.
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*/
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int vdpa_dev_id;
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/* private data for virtio device */
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void *extern_data;
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/* pre and post vhost user message handlers for the device */
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struct vhost_user_extern_ops extern_ops;
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} __rte_cache_aligned;
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#define VHOST_LOG_PAGE 4096
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/*
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* Mark all pages belonging to the same dirty log bitmap byte
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* as dirty. The goal is to avoid concurrency between different
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* threads doing atomic read-modify-writes on the same byte.
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*/
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static __rte_always_inline void
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vhost_log_page(uint8_t *log_base, uint64_t page)
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{
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log_base[page / 8] = 0xff;
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}
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static __rte_always_inline void
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vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
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{
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uint64_t page;
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if (likely(((dev->features & (1ULL << VHOST_F_LOG_ALL)) == 0) ||
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!dev->log_base || !len))
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return;
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if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
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return;
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/* To make sure guest memory updates are committed before logging */
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rte_smp_wmb();
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page = addr / VHOST_LOG_PAGE;
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while (page * VHOST_LOG_PAGE < addr + len) {
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vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
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page += 1;
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}
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}
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static __rte_always_inline void
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vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
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uint64_t offset, uint64_t len)
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{
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vhost_log_write(dev, vq->log_guest_addr + offset, len);
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}
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/* Macros for printing using RTE_LOG */
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#define RTE_LOGTYPE_VHOST_CONFIG RTE_LOGTYPE_USER1
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#define RTE_LOGTYPE_VHOST_DATA RTE_LOGTYPE_USER1
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#ifdef RTE_LIBRTE_VHOST_DEBUG
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#define VHOST_MAX_PRINT_BUFF 6072
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#define VHOST_LOG_DEBUG(log_type, fmt, args...) \
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RTE_LOG(DEBUG, log_type, fmt, ##args)
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#define PRINT_PACKET(device, addr, size, header) do { \
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char *pkt_addr = (char *)(addr); \
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unsigned int index; \
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char packet[VHOST_MAX_PRINT_BUFF]; \
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\
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if ((header)) \
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snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Header size %d: ", (device->vid), (size)); \
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else \
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snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Packet size %d: ", (device->vid), (size)); \
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for (index = 0; index < (size); index++) { \
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snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), \
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"%02hhx ", pkt_addr[index]); \
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} \
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snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), "\n"); \
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\
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VHOST_LOG_DEBUG(VHOST_DATA, "%s", packet); \
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} while (0)
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#else
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#define VHOST_LOG_DEBUG(log_type, fmt, args...) do {} while (0)
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#define PRINT_PACKET(device, addr, size, header) do {} while (0)
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#endif
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extern uint64_t VHOST_FEATURES;
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#define MAX_VHOST_DEVICE 1024
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extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
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/* Convert guest physical address to host physical address */
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static __rte_always_inline rte_iova_t
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gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size)
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{
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uint32_t i;
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struct guest_page *page;
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for (i = 0; i < dev->nr_guest_pages; i++) {
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page = &dev->guest_pages[i];
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if (gpa >= page->guest_phys_addr &&
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gpa + size < page->guest_phys_addr + page->size) {
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return gpa - page->guest_phys_addr +
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page->host_phys_addr;
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}
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}
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return 0;
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}
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static __rte_always_inline struct virtio_net *
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get_device(int vid)
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{
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struct virtio_net *dev = vhost_devices[vid];
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if (unlikely(!dev)) {
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RTE_LOG(ERR, VHOST_CONFIG,
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"(%d) device not found.\n", vid);
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}
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return dev;
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}
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int vhost_new_device(void);
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void cleanup_device(struct virtio_net *dev, int destroy);
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void reset_device(struct virtio_net *dev);
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void vhost_destroy_device(int);
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void cleanup_vq(struct vhost_virtqueue *vq, int destroy);
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void free_vq(struct vhost_virtqueue *vq);
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int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx);
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void vhost_attach_vdpa_device(int vid, int did);
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void vhost_detach_vdpa_device(int vid);
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void vhost_set_ifname(int, const char *if_name, unsigned int if_len);
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void vhost_enable_dequeue_zero_copy(int vid);
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void vhost_set_builtin_virtio_net(int vid, bool enable);
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struct vhost_device_ops const *vhost_driver_callback_get(const char *path);
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/*
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* Backend-specific cleanup.
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*
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* TODO: fix it; we have one backend now
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*/
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void vhost_backend_cleanup(struct virtio_net *dev);
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uint64_t __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
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uint64_t iova, uint64_t size, uint8_t perm);
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int vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq);
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void vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq);
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static __rte_always_inline uint64_t
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vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
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uint64_t iova, uint64_t size, uint8_t perm)
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{
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if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
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return rte_vhost_gpa_to_vva(dev->mem, iova);
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return __vhost_iova_to_vva(dev, vq, iova, size, perm);
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}
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#define vhost_used_event(vr) \
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(*(volatile uint16_t*)&(vr)->avail->ring[(vr)->size])
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/*
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* The following is used with VIRTIO_RING_F_EVENT_IDX.
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* Assuming a given event_idx value from the other size, if we have
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* just incremented index from old to new_idx, should we trigger an
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* event?
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*/
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static __rte_always_inline int
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vhost_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
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{
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return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old);
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}
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static __rte_always_inline void
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vhost_vring_call(struct virtio_net *dev, struct vhost_virtqueue *vq)
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{
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/* Flush used->idx update before we read avail->flags. */
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rte_mb();
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/* Don't kick guest if we don't reach index specified by guest. */
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if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
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uint16_t old = vq->signalled_used;
|
|
uint16_t new = vq->last_used_idx;
|
|
|
|
VHOST_LOG_DEBUG(VHOST_DATA, "%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)) {
|
|
vq->signalled_used = vq->last_used_idx;
|
|
eventfd_write(vq->callfd, (eventfd_t) 1);
|
|
}
|
|
} 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);
|
|
}
|
|
}
|
|
|
|
#endif /* _VHOST_NET_CDEV_H_ */
|