039253166a
This patch adds an operation callback which gets called every time the library is waking up the guest trough an eventfd_write() call. This can be used by 3rd party application, like OVS, to track the number of times interrupts where generated. This might be of interest to find out system-call were called in the fast path. Signed-off-by: Eelco Chaudron <echaudro@redhat.com> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
657 lines
17 KiB
C
657 lines
17 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_malloc.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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#define VHOST_LOG_CACHE_NR 32
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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_iova;
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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 desc_count;
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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 that contains the info for batched dirty logging.
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*/
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struct log_cache_entry {
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uint32_t offset;
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unsigned long val;
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};
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struct vring_used_elem_packed {
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uint16_t id;
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uint32_t len;
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uint32_t count;
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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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union {
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struct vring_desc *desc;
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struct vring_packed_desc *desc_packed;
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};
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union {
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struct vring_avail *avail;
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struct vring_packed_desc_event *driver_event;
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};
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union {
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struct vring_used *used;
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struct vring_packed_desc_event *device_event;
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};
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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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bool signalled_used_valid;
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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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union {
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struct vring_used_elem *shadow_used_split;
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struct vring_used_elem_packed *shadow_used_packed;
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};
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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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bool used_wrap_counter;
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bool avail_wrap_counter;
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struct log_cache_entry log_cache[VHOST_LOG_CACHE_NR];
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uint16_t log_cache_nb_elem;
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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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/* Declare packed ring related bits for older kernels */
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#ifndef VIRTIO_F_RING_PACKED
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#define VIRTIO_F_RING_PACKED 34
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struct vring_packed_desc {
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uint64_t addr;
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uint32_t len;
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uint16_t id;
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uint16_t flags;
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};
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struct vring_packed_desc_event {
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uint16_t off_wrap;
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uint16_t flags;
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};
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#endif
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/*
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* Declare below packed ring defines unconditionally
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* as Kernel header might use different names.
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*/
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#define VRING_DESC_F_AVAIL (1ULL << 7)
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#define VRING_DESC_F_USED (1ULL << 15)
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#define VRING_EVENT_F_ENABLE 0x0
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#define VRING_EVENT_F_DISABLE 0x1
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#define VRING_EVENT_F_DESC 0x2
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/*
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* Available and used descs are in same order
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*/
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#ifndef VIRTIO_F_IN_ORDER
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#define VIRTIO_F_IN_ORDER 35
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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_IN_ORDER) | \
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(1ULL << VIRTIO_F_IOMMU_PLATFORM) | \
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(1ULL << VIRTIO_F_RING_PACKED))
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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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* 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 rte_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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rte_spinlock_t slave_req_lock;
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int postcopy_ufd;
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int postcopy_listening;
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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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/* context data for the external message handlers */
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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 rte_vhost_user_extern_ops extern_ops;
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} __rte_cache_aligned;
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static __rte_always_inline bool
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vq_is_packed(struct virtio_net *dev)
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{
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return dev->features & (1ull << VIRTIO_F_RING_PACKED);
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}
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static inline bool
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desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
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{
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uint16_t flags = *((volatile uint16_t *) &desc->flags);
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return wrap_counter == !!(flags & VRING_DESC_F_AVAIL) &&
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wrap_counter != !!(flags & VRING_DESC_F_USED);
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}
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void __vhost_log_cache_write(struct virtio_net *dev,
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struct vhost_virtqueue *vq,
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uint64_t addr, uint64_t len);
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void __vhost_log_cache_sync(struct virtio_net *dev,
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struct vhost_virtqueue *vq);
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void __vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len);
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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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if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
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__vhost_log_write(dev, addr, len);
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}
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static __rte_always_inline void
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vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
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{
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if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
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__vhost_log_cache_sync(dev, vq);
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}
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static __rte_always_inline void
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vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
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uint64_t addr, uint64_t len)
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{
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if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
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__vhost_log_cache_write(dev, vq, addr, len);
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}
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static __rte_always_inline void
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vhost_log_cache_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_cache_write(dev, vq, vq->log_guest_addr + offset, len);
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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 vhost_destroy_device_notify(struct virtio_net *dev);
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void cleanup_vq(struct vhost_virtqueue *vq, int destroy);
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void free_vq(struct virtio_net *dev, 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_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.
|
|
*
|
|
* 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);
|
|
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_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)) ||
|
|
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_ */
|