/* SPDX-License-Identifier: BSD-3-Clause * Copyright(c) 2010-2016 Intel Corporation */ #include #include #include #include #include #include #include #include #include #ifdef RTE_LIBRTE_VHOST_NUMA #include #endif #include #include #include #include "iotlb.h" #include "vhost.h" #include "vhost_user.h" #define VIRTIO_MIN_MTU 68 #define VIRTIO_MAX_MTU 65535 static const char *vhost_message_str[VHOST_USER_MAX] = { [VHOST_USER_NONE] = "VHOST_USER_NONE", [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES", [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES", [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER", [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER", [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE", [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE", [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD", [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM", [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR", [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE", [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE", [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK", [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL", [VHOST_USER_SET_VRING_ERR] = "VHOST_USER_SET_VRING_ERR", [VHOST_USER_GET_PROTOCOL_FEATURES] = "VHOST_USER_GET_PROTOCOL_FEATURES", [VHOST_USER_SET_PROTOCOL_FEATURES] = "VHOST_USER_SET_PROTOCOL_FEATURES", [VHOST_USER_GET_QUEUE_NUM] = "VHOST_USER_GET_QUEUE_NUM", [VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE", [VHOST_USER_SEND_RARP] = "VHOST_USER_SEND_RARP", [VHOST_USER_NET_SET_MTU] = "VHOST_USER_NET_SET_MTU", [VHOST_USER_SET_SLAVE_REQ_FD] = "VHOST_USER_SET_SLAVE_REQ_FD", [VHOST_USER_IOTLB_MSG] = "VHOST_USER_IOTLB_MSG", }; static uint64_t get_blk_size(int fd) { struct stat stat; int ret; ret = fstat(fd, &stat); return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize; } static void free_mem_region(struct virtio_net *dev) { uint32_t i; struct rte_vhost_mem_region *reg; if (!dev || !dev->mem) return; for (i = 0; i < dev->mem->nregions; i++) { reg = &dev->mem->regions[i]; if (reg->host_user_addr) { munmap(reg->mmap_addr, reg->mmap_size); close(reg->fd); } } } void vhost_backend_cleanup(struct virtio_net *dev) { if (dev->mem) { free_mem_region(dev); rte_free(dev->mem); dev->mem = NULL; } free(dev->guest_pages); dev->guest_pages = NULL; if (dev->log_addr) { munmap((void *)(uintptr_t)dev->log_addr, dev->log_size); dev->log_addr = 0; } if (dev->slave_req_fd >= 0) { close(dev->slave_req_fd); dev->slave_req_fd = -1; } } /* * This function just returns success at the moment unless * the device hasn't been initialised. */ static int vhost_user_set_owner(void) { return 0; } static int vhost_user_reset_owner(struct virtio_net *dev) { if (dev->flags & VIRTIO_DEV_RUNNING) { dev->flags &= ~VIRTIO_DEV_RUNNING; dev->notify_ops->destroy_device(dev->vid); } cleanup_device(dev, 0); reset_device(dev); return 0; } /* * The features that we support are requested. */ static uint64_t vhost_user_get_features(struct virtio_net *dev) { uint64_t features = 0; rte_vhost_driver_get_features(dev->ifname, &features); return features; } /* * We receive the negotiated features supported by us and the virtio device. */ static int vhost_user_set_features(struct virtio_net *dev, uint64_t features) { uint64_t vhost_features = 0; rte_vhost_driver_get_features(dev->ifname, &vhost_features); if (features & ~vhost_features) { RTE_LOG(ERR, VHOST_CONFIG, "(%d) received invalid negotiated features.\n", dev->vid); return -1; } if (dev->flags & VIRTIO_DEV_RUNNING) { if (dev->features == features) return 0; /* * Error out if master tries to change features while device is * in running state. The exception being VHOST_F_LOG_ALL, which * is enabled when the live-migration starts. */ if ((dev->features ^ features) & ~(1ULL << VHOST_F_LOG_ALL)) { RTE_LOG(ERR, VHOST_CONFIG, "(%d) features changed while device is running.\n", dev->vid); return -1; } if (dev->notify_ops->features_changed) dev->notify_ops->features_changed(dev->vid, features); } dev->features = features; if (dev->features & ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) { dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf); } else { dev->vhost_hlen = sizeof(struct virtio_net_hdr); } LOG_DEBUG(VHOST_CONFIG, "(%d) mergeable RX buffers %s, virtio 1 %s\n", dev->vid, (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off", (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off"); if (!(dev->features & (1ULL << VIRTIO_NET_F_MQ))) { /* * Remove all but first queue pair if MQ hasn't been * negotiated. This is safe because the device is not * running at this stage. */ while (dev->nr_vring > 2) { struct vhost_virtqueue *vq; vq = dev->virtqueue[--dev->nr_vring]; if (!vq) continue; dev->virtqueue[dev->nr_vring] = NULL; cleanup_vq(vq, 1); free_vq(vq); } } return 0; } /* * The virtio device sends us the size of the descriptor ring. */ static int vhost_user_set_vring_num(struct virtio_net *dev, VhostUserMsg *msg) { struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index]; vq->size = msg->payload.state.num; if (dev->dequeue_zero_copy) { vq->nr_zmbuf = 0; vq->last_zmbuf_idx = 0; vq->zmbuf_size = vq->size; vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size * sizeof(struct zcopy_mbuf), 0); if (vq->zmbufs == NULL) { RTE_LOG(WARNING, VHOST_CONFIG, "failed to allocate mem for zero copy; " "zero copy is force disabled\n"); dev->dequeue_zero_copy = 0; } TAILQ_INIT(&vq->zmbuf_list); } vq->shadow_used_ring = rte_malloc(NULL, vq->size * sizeof(struct vring_used_elem), RTE_CACHE_LINE_SIZE); if (!vq->shadow_used_ring) { RTE_LOG(ERR, VHOST_CONFIG, "failed to allocate memory for shadow used ring.\n"); return -1; } vq->batch_copy_elems = rte_malloc(NULL, vq->size * sizeof(struct batch_copy_elem), RTE_CACHE_LINE_SIZE); if (!vq->batch_copy_elems) { RTE_LOG(ERR, VHOST_CONFIG, "failed to allocate memory for batching copy.\n"); return -1; } return 0; } /* * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the * same numa node as the memory of vring descriptor. */ #ifdef RTE_LIBRTE_VHOST_NUMA static struct virtio_net* numa_realloc(struct virtio_net *dev, int index) { int oldnode, newnode; struct virtio_net *old_dev; struct vhost_virtqueue *old_vq, *vq; struct zcopy_mbuf *new_zmbuf; struct vring_used_elem *new_shadow_used_ring; struct batch_copy_elem *new_batch_copy_elems; int ret; old_dev = dev; vq = old_vq = dev->virtqueue[index]; ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc, MPOL_F_NODE | MPOL_F_ADDR); /* check if we need to reallocate vq */ ret |= get_mempolicy(&oldnode, NULL, 0, old_vq, MPOL_F_NODE | MPOL_F_ADDR); if (ret) { RTE_LOG(ERR, VHOST_CONFIG, "Unable to get vq numa information.\n"); return dev; } if (oldnode != newnode) { RTE_LOG(INFO, VHOST_CONFIG, "reallocate vq from %d to %d node\n", oldnode, newnode); vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode); if (!vq) return dev; memcpy(vq, old_vq, sizeof(*vq)); TAILQ_INIT(&vq->zmbuf_list); new_zmbuf = rte_malloc_socket(NULL, vq->zmbuf_size * sizeof(struct zcopy_mbuf), 0, newnode); if (new_zmbuf) { rte_free(vq->zmbufs); vq->zmbufs = new_zmbuf; } new_shadow_used_ring = rte_malloc_socket(NULL, vq->size * sizeof(struct vring_used_elem), RTE_CACHE_LINE_SIZE, newnode); if (new_shadow_used_ring) { rte_free(vq->shadow_used_ring); vq->shadow_used_ring = new_shadow_used_ring; } new_batch_copy_elems = rte_malloc_socket(NULL, vq->size * sizeof(struct batch_copy_elem), RTE_CACHE_LINE_SIZE, newnode); if (new_batch_copy_elems) { rte_free(vq->batch_copy_elems); vq->batch_copy_elems = new_batch_copy_elems; } rte_free(old_vq); } /* check if we need to reallocate dev */ ret = get_mempolicy(&oldnode, NULL, 0, old_dev, MPOL_F_NODE | MPOL_F_ADDR); if (ret) { RTE_LOG(ERR, VHOST_CONFIG, "Unable to get dev numa information.\n"); goto out; } if (oldnode != newnode) { RTE_LOG(INFO, VHOST_CONFIG, "reallocate dev from %d to %d node\n", oldnode, newnode); dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode); if (!dev) { dev = old_dev; goto out; } memcpy(dev, old_dev, sizeof(*dev)); rte_free(old_dev); } out: dev->virtqueue[index] = vq; vhost_devices[dev->vid] = dev; if (old_vq != vq) vhost_user_iotlb_init(dev, index); return dev; } #else static struct virtio_net* numa_realloc(struct virtio_net *dev, int index __rte_unused) { return dev; } #endif /* Converts QEMU virtual address to Vhost virtual address. */ static uint64_t qva_to_vva(struct virtio_net *dev, uint64_t qva) { struct rte_vhost_mem_region *reg; uint32_t i; /* Find the region where the address lives. */ for (i = 0; i < dev->mem->nregions; i++) { reg = &dev->mem->regions[i]; if (qva >= reg->guest_user_addr && qva < reg->guest_user_addr + reg->size) { return qva - reg->guest_user_addr + reg->host_user_addr; } } return 0; } /* * Converts ring address to Vhost virtual address. * If IOMMU is enabled, the ring address is a guest IO virtual address, * else it is a QEMU virtual address. */ static uint64_t ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq, uint64_t ra, uint64_t size) { if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) { uint64_t vva; vva = vhost_user_iotlb_cache_find(vq, ra, &size, VHOST_ACCESS_RW); if (!vva) vhost_user_iotlb_miss(dev, ra, VHOST_ACCESS_RW); return vva; } return qva_to_vva(dev, ra); } static struct virtio_net * translate_ring_addresses(struct virtio_net *dev, int vq_index) { struct vhost_virtqueue *vq = dev->virtqueue[vq_index]; struct vhost_vring_addr *addr = &vq->ring_addrs; /* The addresses are converted from QEMU virtual to Vhost virtual. */ if (vq->desc && vq->avail && vq->used) return dev; vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev, vq, addr->desc_user_addr, sizeof(struct vring_desc)); if (vq->desc == 0) { RTE_LOG(DEBUG, VHOST_CONFIG, "(%d) failed to find desc ring address.\n", dev->vid); return dev; } dev = numa_realloc(dev, vq_index); vq = dev->virtqueue[vq_index]; addr = &vq->ring_addrs; vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev, vq, addr->avail_user_addr, sizeof(struct vring_avail)); if (vq->avail == 0) { RTE_LOG(DEBUG, VHOST_CONFIG, "(%d) failed to find avail ring address.\n", dev->vid); return dev; } vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev, vq, addr->used_user_addr, sizeof(struct vring_used)); if (vq->used == 0) { RTE_LOG(DEBUG, VHOST_CONFIG, "(%d) failed to find used ring address.\n", dev->vid); return dev; } if (vq->last_used_idx != vq->used->idx) { RTE_LOG(WARNING, VHOST_CONFIG, "last_used_idx (%u) and vq->used->idx (%u) mismatches; " "some packets maybe resent for Tx and dropped for Rx\n", vq->last_used_idx, vq->used->idx); vq->last_used_idx = vq->used->idx; vq->last_avail_idx = vq->used->idx; } vq->log_guest_addr = addr->log_guest_addr; LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n", dev->vid, vq->desc); LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address avail: %p\n", dev->vid, vq->avail); LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address used: %p\n", dev->vid, vq->used); LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n", dev->vid, vq->log_guest_addr); return dev; } /* * The virtio device sends us the desc, used and avail ring addresses. * This function then converts these to our address space. */ static int vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg) { struct vhost_virtqueue *vq; struct vhost_vring_addr *addr = &msg->payload.addr; struct virtio_net *dev = *pdev; if (dev->mem == NULL) return -1; /* addr->index refers to the queue index. The txq 1, rxq is 0. */ vq = dev->virtqueue[msg->payload.addr.index]; /* * Rings addresses should not be interpreted as long as the ring is not * started and enabled */ memcpy(&vq->ring_addrs, addr, sizeof(*addr)); vring_invalidate(dev, vq); if (vq->enabled && (dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) { dev = translate_ring_addresses(dev, msg->payload.state.index); if (!dev) return -1; *pdev = dev; } return 0; } /* * The virtio device sends us the available ring last used index. */ static int vhost_user_set_vring_base(struct virtio_net *dev, VhostUserMsg *msg) { dev->virtqueue[msg->payload.state.index]->last_used_idx = msg->payload.state.num; dev->virtqueue[msg->payload.state.index]->last_avail_idx = msg->payload.state.num; return 0; } static void add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr, uint64_t host_phys_addr, uint64_t size) { struct guest_page *page, *last_page; if (dev->nr_guest_pages == dev->max_guest_pages) { dev->max_guest_pages *= 2; dev->guest_pages = realloc(dev->guest_pages, dev->max_guest_pages * sizeof(*page)); } if (dev->nr_guest_pages > 0) { last_page = &dev->guest_pages[dev->nr_guest_pages - 1]; /* merge if the two pages are continuous */ if (host_phys_addr == last_page->host_phys_addr + last_page->size) { last_page->size += size; return; } } page = &dev->guest_pages[dev->nr_guest_pages++]; page->guest_phys_addr = guest_phys_addr; page->host_phys_addr = host_phys_addr; page->size = size; } static void add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg, uint64_t page_size) { uint64_t reg_size = reg->size; uint64_t host_user_addr = reg->host_user_addr; uint64_t guest_phys_addr = reg->guest_phys_addr; uint64_t host_phys_addr; uint64_t size; host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr); size = page_size - (guest_phys_addr & (page_size - 1)); size = RTE_MIN(size, reg_size); add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size); host_user_addr += size; guest_phys_addr += size; reg_size -= size; while (reg_size > 0) { size = RTE_MIN(reg_size, page_size); host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t) host_user_addr); add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size); host_user_addr += size; guest_phys_addr += size; reg_size -= size; } } #ifdef RTE_LIBRTE_VHOST_DEBUG /* TODO: enable it only in debug mode? */ static void dump_guest_pages(struct virtio_net *dev) { uint32_t i; struct guest_page *page; for (i = 0; i < dev->nr_guest_pages; i++) { page = &dev->guest_pages[i]; RTE_LOG(INFO, VHOST_CONFIG, "guest physical page region %u\n" "\t guest_phys_addr: %" PRIx64 "\n" "\t host_phys_addr : %" PRIx64 "\n" "\t size : %" PRIx64 "\n", i, page->guest_phys_addr, page->host_phys_addr, page->size); } } #else #define dump_guest_pages(dev) #endif static bool vhost_memory_changed(struct VhostUserMemory *new, struct rte_vhost_memory *old) { uint32_t i; if (new->nregions != old->nregions) return true; for (i = 0; i < new->nregions; ++i) { VhostUserMemoryRegion *new_r = &new->regions[i]; struct rte_vhost_mem_region *old_r = &old->regions[i]; if (new_r->guest_phys_addr != old_r->guest_phys_addr) return true; if (new_r->memory_size != old_r->size) return true; if (new_r->userspace_addr != old_r->guest_user_addr) return true; } return false; } static int vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg) { struct VhostUserMemory memory = pmsg->payload.memory; struct rte_vhost_mem_region *reg; void *mmap_addr; uint64_t mmap_size; uint64_t mmap_offset; uint64_t alignment; uint32_t i; int fd; if (dev->mem && !vhost_memory_changed(&memory, dev->mem)) { RTE_LOG(INFO, VHOST_CONFIG, "(%d) memory regions not changed\n", dev->vid); for (i = 0; i < memory.nregions; i++) close(pmsg->fds[i]); return 0; } if (dev->mem) { free_mem_region(dev); rte_free(dev->mem); dev->mem = NULL; } dev->nr_guest_pages = 0; if (!dev->guest_pages) { dev->max_guest_pages = 8; dev->guest_pages = malloc(dev->max_guest_pages * sizeof(struct guest_page)); if (dev->guest_pages == NULL) { RTE_LOG(ERR, VHOST_CONFIG, "(%d) failed to allocate memory " "for dev->guest_pages\n", dev->vid); return -1; } } dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) + sizeof(struct rte_vhost_mem_region) * memory.nregions, 0); if (dev->mem == NULL) { RTE_LOG(ERR, VHOST_CONFIG, "(%d) failed to allocate memory for dev->mem\n", dev->vid); return -1; } dev->mem->nregions = memory.nregions; for (i = 0; i < memory.nregions; i++) { fd = pmsg->fds[i]; reg = &dev->mem->regions[i]; reg->guest_phys_addr = memory.regions[i].guest_phys_addr; reg->guest_user_addr = memory.regions[i].userspace_addr; reg->size = memory.regions[i].memory_size; reg->fd = fd; mmap_offset = memory.regions[i].mmap_offset; mmap_size = reg->size + mmap_offset; /* mmap() without flag of MAP_ANONYMOUS, should be called * with length argument aligned with hugepagesz at older * longterm version Linux, like 2.6.32 and 3.2.72, or * mmap() will fail with EINVAL. * * to avoid failure, make sure in caller to keep length * aligned. */ alignment = get_blk_size(fd); if (alignment == (uint64_t)-1) { RTE_LOG(ERR, VHOST_CONFIG, "couldn't get hugepage size through fstat\n"); goto err_mmap; } mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment); mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd, 0); if (mmap_addr == MAP_FAILED) { RTE_LOG(ERR, VHOST_CONFIG, "mmap region %u failed.\n", i); goto err_mmap; } reg->mmap_addr = mmap_addr; reg->mmap_size = mmap_size; reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr + mmap_offset; if (dev->dequeue_zero_copy) add_guest_pages(dev, reg, alignment); RTE_LOG(INFO, VHOST_CONFIG, "guest memory region %u, size: 0x%" PRIx64 "\n" "\t guest physical addr: 0x%" PRIx64 "\n" "\t guest virtual addr: 0x%" PRIx64 "\n" "\t host virtual addr: 0x%" PRIx64 "\n" "\t mmap addr : 0x%" PRIx64 "\n" "\t mmap size : 0x%" PRIx64 "\n" "\t mmap align: 0x%" PRIx64 "\n" "\t mmap off : 0x%" PRIx64 "\n", i, reg->size, reg->guest_phys_addr, reg->guest_user_addr, reg->host_user_addr, (uint64_t)(uintptr_t)mmap_addr, mmap_size, alignment, mmap_offset); } dump_guest_pages(dev); return 0; err_mmap: free_mem_region(dev); rte_free(dev->mem); dev->mem = NULL; return -1; } static int vq_is_ready(struct vhost_virtqueue *vq) { return vq && vq->desc && vq->avail && vq->used && vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD && vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD; } static int virtio_is_ready(struct virtio_net *dev) { struct vhost_virtqueue *vq; uint32_t i; if (dev->nr_vring == 0) return 0; for (i = 0; i < dev->nr_vring; i++) { vq = dev->virtqueue[i]; if (!vq_is_ready(vq)) return 0; } RTE_LOG(INFO, VHOST_CONFIG, "virtio is now ready for processing.\n"); return 1; } static void vhost_user_set_vring_call(struct virtio_net *dev, struct VhostUserMsg *pmsg) { struct vhost_vring_file file; struct vhost_virtqueue *vq; file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) file.fd = VIRTIO_INVALID_EVENTFD; else file.fd = pmsg->fds[0]; RTE_LOG(INFO, VHOST_CONFIG, "vring call idx:%d file:%d\n", file.index, file.fd); vq = dev->virtqueue[file.index]; if (vq->callfd >= 0) close(vq->callfd); vq->callfd = file.fd; } static void vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *pmsg) { struct vhost_vring_file file; struct vhost_virtqueue *vq; struct virtio_net *dev = *pdev; file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) file.fd = VIRTIO_INVALID_EVENTFD; else file.fd = pmsg->fds[0]; RTE_LOG(INFO, VHOST_CONFIG, "vring kick idx:%d file:%d\n", file.index, file.fd); /* Interpret ring addresses only when ring is started. */ dev = translate_ring_addresses(dev, file.index); if (!dev) return; *pdev = dev; vq = dev->virtqueue[file.index]; /* * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated, * the ring starts already enabled. Otherwise, it is enabled via * the SET_VRING_ENABLE message. */ if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) vq->enabled = 1; if (vq->kickfd >= 0) close(vq->kickfd); vq->kickfd = file.fd; } static void free_zmbufs(struct vhost_virtqueue *vq) { struct zcopy_mbuf *zmbuf, *next; for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list); zmbuf != NULL; zmbuf = next) { next = TAILQ_NEXT(zmbuf, next); rte_pktmbuf_free(zmbuf->mbuf); TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next); } rte_free(vq->zmbufs); } /* * when virtio is stopped, qemu will send us the GET_VRING_BASE message. */ static int vhost_user_get_vring_base(struct virtio_net *dev, VhostUserMsg *msg) { struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index]; /* We have to stop the queue (virtio) if it is running. */ if (dev->flags & VIRTIO_DEV_RUNNING) { dev->flags &= ~VIRTIO_DEV_RUNNING; dev->notify_ops->destroy_device(dev->vid); } dev->flags &= ~VIRTIO_DEV_READY; /* Here we are safe to get the last used index */ msg->payload.state.num = vq->last_used_idx; RTE_LOG(INFO, VHOST_CONFIG, "vring base idx:%d file:%d\n", msg->payload.state.index, msg->payload.state.num); /* * Based on current qemu vhost-user implementation, this message is * sent and only sent in vhost_vring_stop. * TODO: cleanup the vring, it isn't usable since here. */ if (vq->kickfd >= 0) close(vq->kickfd); vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD; if (dev->dequeue_zero_copy) free_zmbufs(vq); rte_free(vq->shadow_used_ring); vq->shadow_used_ring = NULL; rte_free(vq->batch_copy_elems); vq->batch_copy_elems = NULL; return 0; } /* * when virtio queues are ready to work, qemu will send us to * enable the virtio queue pair. */ static int vhost_user_set_vring_enable(struct virtio_net *dev, VhostUserMsg *msg) { int enable = (int)msg->payload.state.num; RTE_LOG(INFO, VHOST_CONFIG, "set queue enable: %d to qp idx: %d\n", enable, msg->payload.state.index); if (dev->notify_ops->vring_state_changed) dev->notify_ops->vring_state_changed(dev->vid, msg->payload.state.index, enable); dev->virtqueue[msg->payload.state.index]->enabled = enable; return 0; } static void vhost_user_get_protocol_features(struct virtio_net *dev, struct VhostUserMsg *msg) { uint64_t features, protocol_features = VHOST_USER_PROTOCOL_FEATURES; rte_vhost_driver_get_features(dev->ifname, &features); /* * REPLY_ACK protocol feature is only mandatory for now * for IOMMU feature. If IOMMU is explicitly disabled by the * application, disable also REPLY_ACK feature for older buggy * Qemu versions (from v2.7.0 to v2.9.0). */ if (!(features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK); msg->payload.u64 = protocol_features; msg->size = sizeof(msg->payload.u64); } static void vhost_user_set_protocol_features(struct virtio_net *dev, uint64_t protocol_features) { if (protocol_features & ~VHOST_USER_PROTOCOL_FEATURES) return; dev->protocol_features = protocol_features; } static int vhost_user_set_log_base(struct virtio_net *dev, struct VhostUserMsg *msg) { int fd = msg->fds[0]; uint64_t size, off; void *addr; if (fd < 0) { RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd); return -1; } if (msg->size != sizeof(VhostUserLog)) { RTE_LOG(ERR, VHOST_CONFIG, "invalid log base msg size: %"PRId32" != %d\n", msg->size, (int)sizeof(VhostUserLog)); return -1; } size = msg->payload.log.mmap_size; off = msg->payload.log.mmap_offset; RTE_LOG(INFO, VHOST_CONFIG, "log mmap size: %"PRId64", offset: %"PRId64"\n", size, off); /* * mmap from 0 to workaround a hugepage mmap bug: mmap will * fail when offset is not page size aligned. */ addr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); close(fd); if (addr == MAP_FAILED) { RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n"); return -1; } /* * Free previously mapped log memory on occasionally * multiple VHOST_USER_SET_LOG_BASE. */ if (dev->log_addr) { munmap((void *)(uintptr_t)dev->log_addr, dev->log_size); } dev->log_addr = (uint64_t)(uintptr_t)addr; dev->log_base = dev->log_addr + off; dev->log_size = size; return 0; } /* * An rarp packet is constructed and broadcasted to notify switches about * the new location of the migrated VM, so that packets from outside will * not be lost after migration. * * However, we don't actually "send" a rarp packet here, instead, we set * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it. */ static int vhost_user_send_rarp(struct virtio_net *dev, struct VhostUserMsg *msg) { uint8_t *mac = (uint8_t *)&msg->payload.u64; RTE_LOG(DEBUG, VHOST_CONFIG, ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); memcpy(dev->mac.addr_bytes, mac, 6); /* * Set the flag to inject a RARP broadcast packet at * rte_vhost_dequeue_burst(). * * rte_smp_wmb() is for making sure the mac is copied * before the flag is set. */ rte_smp_wmb(); rte_atomic16_set(&dev->broadcast_rarp, 1); return 0; } static int vhost_user_net_set_mtu(struct virtio_net *dev, struct VhostUserMsg *msg) { if (msg->payload.u64 < VIRTIO_MIN_MTU || msg->payload.u64 > VIRTIO_MAX_MTU) { RTE_LOG(ERR, VHOST_CONFIG, "Invalid MTU size (%"PRIu64")\n", msg->payload.u64); return -1; } dev->mtu = msg->payload.u64; return 0; } static int vhost_user_set_req_fd(struct virtio_net *dev, struct VhostUserMsg *msg) { int fd = msg->fds[0]; if (fd < 0) { RTE_LOG(ERR, VHOST_CONFIG, "Invalid file descriptor for slave channel (%d)\n", fd); return -1; } dev->slave_req_fd = fd; return 0; } static int is_vring_iotlb_update(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg) { struct vhost_vring_addr *ra; uint64_t start, end; start = imsg->iova; end = start + imsg->size; ra = &vq->ring_addrs; if (ra->desc_user_addr >= start && ra->desc_user_addr < end) return 1; if (ra->avail_user_addr >= start && ra->avail_user_addr < end) return 1; if (ra->used_user_addr >= start && ra->used_user_addr < end) return 1; return 0; } static int is_vring_iotlb_invalidate(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg) { uint64_t istart, iend, vstart, vend; istart = imsg->iova; iend = istart + imsg->size - 1; vstart = (uintptr_t)vq->desc; vend = vstart + sizeof(struct vring_desc) * vq->size - 1; if (vstart <= iend && istart <= vend) return 1; vstart = (uintptr_t)vq->avail; vend = vstart + sizeof(struct vring_avail); vend += sizeof(uint16_t) * vq->size - 1; if (vstart <= iend && istart <= vend) return 1; vstart = (uintptr_t)vq->used; vend = vstart + sizeof(struct vring_used); vend += sizeof(struct vring_used_elem) * vq->size - 1; if (vstart <= iend && istart <= vend) return 1; return 0; } static int vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg) { struct virtio_net *dev = *pdev; struct vhost_iotlb_msg *imsg = &msg->payload.iotlb; uint16_t i; uint64_t vva; switch (imsg->type) { case VHOST_IOTLB_UPDATE: vva = qva_to_vva(dev, imsg->uaddr); if (!vva) return -1; for (i = 0; i < dev->nr_vring; i++) { struct vhost_virtqueue *vq = dev->virtqueue[i]; vhost_user_iotlb_cache_insert(vq, imsg->iova, vva, imsg->size, imsg->perm); if (is_vring_iotlb_update(vq, imsg)) *pdev = dev = translate_ring_addresses(dev, i); } break; case VHOST_IOTLB_INVALIDATE: for (i = 0; i < dev->nr_vring; i++) { struct vhost_virtqueue *vq = dev->virtqueue[i]; vhost_user_iotlb_cache_remove(vq, imsg->iova, imsg->size); if (is_vring_iotlb_invalidate(vq, imsg)) vring_invalidate(dev, vq); } break; default: RTE_LOG(ERR, VHOST_CONFIG, "Invalid IOTLB message type (%d)\n", imsg->type); return -1; } return 0; } /* return bytes# of read on success or negative val on failure. */ static int read_vhost_message(int sockfd, struct VhostUserMsg *msg) { int ret; ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE, msg->fds, VHOST_MEMORY_MAX_NREGIONS); if (ret <= 0) return ret; if (msg && msg->size) { if (msg->size > sizeof(msg->payload)) { RTE_LOG(ERR, VHOST_CONFIG, "invalid msg size: %d\n", msg->size); return -1; } ret = read(sockfd, &msg->payload, msg->size); if (ret <= 0) return ret; if (ret != (int)msg->size) { RTE_LOG(ERR, VHOST_CONFIG, "read control message failed\n"); return -1; } } return ret; } static int send_vhost_message(int sockfd, struct VhostUserMsg *msg) { if (!msg) return 0; return send_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE + msg->size, NULL, 0); } static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg) { if (!msg) return 0; msg->flags &= ~VHOST_USER_VERSION_MASK; msg->flags &= ~VHOST_USER_NEED_REPLY; msg->flags |= VHOST_USER_VERSION; msg->flags |= VHOST_USER_REPLY_MASK; return send_vhost_message(sockfd, msg); } /* * Allocate a queue pair if it hasn't been allocated yet */ static int vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev, VhostUserMsg *msg) { uint16_t vring_idx; switch (msg->request.master) { case VHOST_USER_SET_VRING_KICK: case VHOST_USER_SET_VRING_CALL: case VHOST_USER_SET_VRING_ERR: vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK; break; case VHOST_USER_SET_VRING_NUM: case VHOST_USER_SET_VRING_BASE: case VHOST_USER_SET_VRING_ENABLE: vring_idx = msg->payload.state.index; break; case VHOST_USER_SET_VRING_ADDR: vring_idx = msg->payload.addr.index; break; default: return 0; } if (vring_idx >= VHOST_MAX_VRING) { RTE_LOG(ERR, VHOST_CONFIG, "invalid vring index: %u\n", vring_idx); return -1; } if (dev->virtqueue[vring_idx]) return 0; return alloc_vring_queue(dev, vring_idx); } int vhost_user_msg_handler(int vid, int fd) { struct virtio_net *dev; struct VhostUserMsg msg; int ret; dev = get_device(vid); if (dev == NULL) return -1; if (!dev->notify_ops) { dev->notify_ops = vhost_driver_callback_get(dev->ifname); if (!dev->notify_ops) { RTE_LOG(ERR, VHOST_CONFIG, "failed to get callback ops for driver %s\n", dev->ifname); return -1; } } ret = read_vhost_message(fd, &msg); if (ret <= 0 || msg.request.master >= VHOST_USER_MAX) { if (ret < 0) RTE_LOG(ERR, VHOST_CONFIG, "vhost read message failed\n"); else if (ret == 0) RTE_LOG(INFO, VHOST_CONFIG, "vhost peer closed\n"); else RTE_LOG(ERR, VHOST_CONFIG, "vhost read incorrect message\n"); return -1; } ret = 0; if (msg.request.master != VHOST_USER_IOTLB_MSG) RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n", vhost_message_str[msg.request.master]); else RTE_LOG(DEBUG, VHOST_CONFIG, "read message %s\n", vhost_message_str[msg.request.master]); ret = vhost_user_check_and_alloc_queue_pair(dev, &msg); if (ret < 0) { RTE_LOG(ERR, VHOST_CONFIG, "failed to alloc queue\n"); return -1; } switch (msg.request.master) { case VHOST_USER_GET_FEATURES: msg.payload.u64 = vhost_user_get_features(dev); msg.size = sizeof(msg.payload.u64); send_vhost_reply(fd, &msg); break; case VHOST_USER_SET_FEATURES: ret = vhost_user_set_features(dev, msg.payload.u64); if (ret) return -1; break; case VHOST_USER_GET_PROTOCOL_FEATURES: vhost_user_get_protocol_features(dev, &msg); send_vhost_reply(fd, &msg); break; case VHOST_USER_SET_PROTOCOL_FEATURES: vhost_user_set_protocol_features(dev, msg.payload.u64); break; case VHOST_USER_SET_OWNER: vhost_user_set_owner(); break; case VHOST_USER_RESET_OWNER: vhost_user_reset_owner(dev); break; case VHOST_USER_SET_MEM_TABLE: ret = vhost_user_set_mem_table(dev, &msg); break; case VHOST_USER_SET_LOG_BASE: vhost_user_set_log_base(dev, &msg); /* it needs a reply */ msg.size = sizeof(msg.payload.u64); send_vhost_reply(fd, &msg); break; case VHOST_USER_SET_LOG_FD: close(msg.fds[0]); RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n"); break; case VHOST_USER_SET_VRING_NUM: vhost_user_set_vring_num(dev, &msg); break; case VHOST_USER_SET_VRING_ADDR: vhost_user_set_vring_addr(&dev, &msg); break; case VHOST_USER_SET_VRING_BASE: vhost_user_set_vring_base(dev, &msg); break; case VHOST_USER_GET_VRING_BASE: vhost_user_get_vring_base(dev, &msg); msg.size = sizeof(msg.payload.state); send_vhost_reply(fd, &msg); break; case VHOST_USER_SET_VRING_KICK: vhost_user_set_vring_kick(&dev, &msg); break; case VHOST_USER_SET_VRING_CALL: vhost_user_set_vring_call(dev, &msg); break; case VHOST_USER_SET_VRING_ERR: if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK)) close(msg.fds[0]); RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n"); break; case VHOST_USER_GET_QUEUE_NUM: msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS; msg.size = sizeof(msg.payload.u64); send_vhost_reply(fd, &msg); break; case VHOST_USER_SET_VRING_ENABLE: vhost_user_set_vring_enable(dev, &msg); break; case VHOST_USER_SEND_RARP: vhost_user_send_rarp(dev, &msg); break; case VHOST_USER_NET_SET_MTU: ret = vhost_user_net_set_mtu(dev, &msg); break; case VHOST_USER_SET_SLAVE_REQ_FD: ret = vhost_user_set_req_fd(dev, &msg); break; case VHOST_USER_IOTLB_MSG: ret = vhost_user_iotlb_msg(&dev, &msg); break; default: ret = -1; break; } if (msg.flags & VHOST_USER_NEED_REPLY) { msg.payload.u64 = !!ret; msg.size = sizeof(msg.payload.u64); send_vhost_reply(fd, &msg); } if (!(dev->flags & VIRTIO_DEV_RUNNING) && virtio_is_ready(dev)) { dev->flags |= VIRTIO_DEV_READY; if (!(dev->flags & VIRTIO_DEV_RUNNING)) { if (dev->dequeue_zero_copy) { RTE_LOG(INFO, VHOST_CONFIG, "dequeue zero copy is enabled\n"); } if (dev->notify_ops->new_device(dev->vid) == 0) dev->flags |= VIRTIO_DEV_RUNNING; } } return 0; } int vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm) { int ret; struct VhostUserMsg msg = { .request.slave = VHOST_USER_SLAVE_IOTLB_MSG, .flags = VHOST_USER_VERSION, .size = sizeof(msg.payload.iotlb), .payload.iotlb = { .iova = iova, .perm = perm, .type = VHOST_IOTLB_MISS, }, }; ret = send_vhost_message(dev->slave_req_fd, &msg); if (ret < 0) { RTE_LOG(ERR, VHOST_CONFIG, "Failed to send IOTLB miss message (%d)\n", ret); return ret; } return 0; }