/* * Vhost User Bridge * * Copyright (c) 2015 Red Hat, Inc. * * Authors: * Victor Kaplansky * * This work is licensed under the terms of the GNU GPL, version 2 or * later. See the COPYING file in the top-level directory. */ /* * TODO: * - main should get parameters from the command line. * - implement all request handlers. * - test for broken requests and virtqueue. * - implement features defined by Virtio 1.0 spec. * - support mergeable buffers and indirect descriptors. * - implement RESET_DEVICE request. * - implement clean shutdown. * - implement non-blocking writes to UDP backend. * - implement polling strategy. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "qemu/atomic.h" #include "standard-headers/linux/virtio_net.h" #include "standard-headers/linux/virtio_ring.h" #define VHOST_USER_BRIDGE_DEBUG 1 #define DPRINT(...) \ do { \ if (VHOST_USER_BRIDGE_DEBUG) { \ printf(__VA_ARGS__); \ } \ } while (0) typedef void (*CallbackFunc)(int sock, void *ctx); typedef struct Event { void *ctx; CallbackFunc callback; } Event; typedef struct Dispatcher { int max_sock; fd_set fdset; Event events[FD_SETSIZE]; } Dispatcher; static void vubr_die(const char *s) { perror(s); exit(1); } static int dispatcher_init(Dispatcher *dispr) { FD_ZERO(&dispr->fdset); dispr->max_sock = -1; return 0; } static int dispatcher_add(Dispatcher *dispr, int sock, void *ctx, CallbackFunc cb) { if (sock >= FD_SETSIZE) { fprintf(stderr, "Error: Failed to add new event. sock %d should be less than %d\n", sock, FD_SETSIZE); return -1; } dispr->events[sock].ctx = ctx; dispr->events[sock].callback = cb; FD_SET(sock, &dispr->fdset); if (sock > dispr->max_sock) { dispr->max_sock = sock; } DPRINT("Added sock %d for watching. max_sock: %d\n", sock, dispr->max_sock); return 0; } #if 0 /* dispatcher_remove() is not currently in use but may be useful * in the future. */ static int dispatcher_remove(Dispatcher *dispr, int sock) { if (sock >= FD_SETSIZE) { fprintf(stderr, "Error: Failed to remove event. sock %d should be less than %d\n", sock, FD_SETSIZE); return -1; } FD_CLR(sock, &dispr->fdset); return 0; } #endif /* timeout in us */ static int dispatcher_wait(Dispatcher *dispr, uint32_t timeout) { struct timeval tv; tv.tv_sec = timeout / 1000000; tv.tv_usec = timeout % 1000000; fd_set fdset = dispr->fdset; /* wait until some of sockets become readable. */ int rc = select(dispr->max_sock + 1, &fdset, 0, 0, &tv); if (rc == -1) { vubr_die("select"); } /* Timeout */ if (rc == 0) { return 0; } /* Now call callback for every ready socket. */ int sock; for (sock = 0; sock < dispr->max_sock + 1; sock++) if (FD_ISSET(sock, &fdset)) { Event *e = &dispr->events[sock]; e->callback(sock, e->ctx); } return 0; } typedef struct VubrVirtq { int call_fd; int kick_fd; uint32_t size; uint16_t last_avail_index; uint16_t last_used_index; struct vring_desc *desc; struct vring_avail *avail; struct vring_used *used; } VubrVirtq; /* Based on qemu/hw/virtio/vhost-user.c */ #define VHOST_MEMORY_MAX_NREGIONS 8 #define VHOST_USER_F_PROTOCOL_FEATURES 30 enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_MQ = 0, VHOST_USER_PROTOCOL_F_LOG_SHMFD = 1, VHOST_USER_PROTOCOL_F_RARP = 2, VHOST_USER_PROTOCOL_F_MAX }; #define VHOST_USER_PROTOCOL_FEATURE_MASK ((1 << VHOST_USER_PROTOCOL_F_MAX) - 1) typedef enum VhostUserRequest { VHOST_USER_NONE = 0, VHOST_USER_GET_FEATURES = 1, VHOST_USER_SET_FEATURES = 2, VHOST_USER_SET_OWNER = 3, VHOST_USER_RESET_DEVICE = 4, VHOST_USER_SET_MEM_TABLE = 5, VHOST_USER_SET_LOG_BASE = 6, VHOST_USER_SET_LOG_FD = 7, VHOST_USER_SET_VRING_NUM = 8, VHOST_USER_SET_VRING_ADDR = 9, VHOST_USER_SET_VRING_BASE = 10, VHOST_USER_GET_VRING_BASE = 11, VHOST_USER_SET_VRING_KICK = 12, VHOST_USER_SET_VRING_CALL = 13, VHOST_USER_SET_VRING_ERR = 14, VHOST_USER_GET_PROTOCOL_FEATURES = 15, VHOST_USER_SET_PROTOCOL_FEATURES = 16, VHOST_USER_GET_QUEUE_NUM = 17, VHOST_USER_SET_VRING_ENABLE = 18, VHOST_USER_SEND_RARP = 19, VHOST_USER_MAX } VhostUserRequest; typedef struct VhostUserMemoryRegion { uint64_t guest_phys_addr; uint64_t memory_size; uint64_t userspace_addr; uint64_t mmap_offset; } VhostUserMemoryRegion; typedef struct VhostUserMemory { uint32_t nregions; uint32_t padding; VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS]; } VhostUserMemory; typedef struct VhostUserMsg { VhostUserRequest request; #define VHOST_USER_VERSION_MASK (0x3) #define VHOST_USER_REPLY_MASK (0x1<<2) uint32_t flags; uint32_t size; /* the following payload size */ union { #define VHOST_USER_VRING_IDX_MASK (0xff) #define VHOST_USER_VRING_NOFD_MASK (0x1<<8) uint64_t u64; struct vhost_vring_state state; struct vhost_vring_addr addr; VhostUserMemory memory; } payload; int fds[VHOST_MEMORY_MAX_NREGIONS]; int fd_num; } QEMU_PACKED VhostUserMsg; #define VHOST_USER_HDR_SIZE offsetof(VhostUserMsg, payload.u64) /* The version of the protocol we support */ #define VHOST_USER_VERSION (0x1) #define MAX_NR_VIRTQUEUE (8) typedef struct VubrDevRegion { /* Guest Physical address. */ uint64_t gpa; /* Memory region size. */ uint64_t size; /* QEMU virtual address (userspace). */ uint64_t qva; /* Starting offset in our mmaped space. */ uint64_t mmap_offset; /* Start address of mmaped space. */ uint64_t mmap_addr; } VubrDevRegion; typedef struct VubrDev { int sock; Dispatcher dispatcher; uint32_t nregions; VubrDevRegion regions[VHOST_MEMORY_MAX_NREGIONS]; VubrVirtq vq[MAX_NR_VIRTQUEUE]; int backend_udp_sock; struct sockaddr_in backend_udp_dest; } VubrDev; static const char *vubr_request_str[] = { [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_DEVICE] = "VHOST_USER_RESET_DEVICE", [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_MAX] = "VHOST_USER_MAX", }; static void print_buffer(uint8_t *buf, size_t len) { int i; printf("Raw buffer:\n"); for (i = 0; i < len; i++) { if (i % 16 == 0) { printf("\n"); } if (i % 4 == 0) { printf(" "); } printf("%02x ", buf[i]); } printf("\n............................................................\n"); } /* Translate guest physical address to our virtual address. */ static uint64_t gpa_to_va(VubrDev *dev, uint64_t guest_addr) { int i; /* Find matching memory region. */ for (i = 0; i < dev->nregions; i++) { VubrDevRegion *r = &dev->regions[i]; if ((guest_addr >= r->gpa) && (guest_addr < (r->gpa + r->size))) { return guest_addr - r->gpa + r->mmap_addr + r->mmap_offset; } } assert(!"address not found in regions"); return 0; } /* Translate qemu virtual address to our virtual address. */ static uint64_t qva_to_va(VubrDev *dev, uint64_t qemu_addr) { int i; /* Find matching memory region. */ for (i = 0; i < dev->nregions; i++) { VubrDevRegion *r = &dev->regions[i]; if ((qemu_addr >= r->qva) && (qemu_addr < (r->qva + r->size))) { return qemu_addr - r->qva + r->mmap_addr + r->mmap_offset; } } assert(!"address not found in regions"); return 0; } static void vubr_message_read(int conn_fd, VhostUserMsg *vmsg) { char control[CMSG_SPACE(VHOST_MEMORY_MAX_NREGIONS * sizeof(int))] = { }; struct iovec iov = { .iov_base = (char *)vmsg, .iov_len = VHOST_USER_HDR_SIZE, }; struct msghdr msg = { .msg_iov = &iov, .msg_iovlen = 1, .msg_control = control, .msg_controllen = sizeof(control), }; size_t fd_size; struct cmsghdr *cmsg; int rc; rc = recvmsg(conn_fd, &msg, 0); if (rc <= 0) { vubr_die("recvmsg"); } vmsg->fd_num = 0; for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) { if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) { fd_size = cmsg->cmsg_len - CMSG_LEN(0); vmsg->fd_num = fd_size / sizeof(int); memcpy(vmsg->fds, CMSG_DATA(cmsg), fd_size); break; } } if (vmsg->size > sizeof(vmsg->payload)) { fprintf(stderr, "Error: too big message request: %d, size: vmsg->size: %u, " "while sizeof(vmsg->payload) = %lu\n", vmsg->request, vmsg->size, sizeof(vmsg->payload)); exit(1); } if (vmsg->size) { rc = read(conn_fd, &vmsg->payload, vmsg->size); if (rc <= 0) { vubr_die("recvmsg"); } assert(rc == vmsg->size); } } static void vubr_message_write(int conn_fd, VhostUserMsg *vmsg) { int rc; do { rc = write(conn_fd, vmsg, VHOST_USER_HDR_SIZE + vmsg->size); } while (rc < 0 && errno == EINTR); if (rc < 0) { vubr_die("write"); } } static void vubr_backend_udp_sendbuf(VubrDev *dev, uint8_t *buf, size_t len) { int slen = sizeof(struct sockaddr_in); if (sendto(dev->backend_udp_sock, buf, len, 0, (struct sockaddr *) &dev->backend_udp_dest, slen) == -1) { vubr_die("sendto()"); } } static int vubr_backend_udp_recvbuf(VubrDev *dev, uint8_t *buf, size_t buflen) { int slen = sizeof(struct sockaddr_in); int rc; rc = recvfrom(dev->backend_udp_sock, buf, buflen, 0, (struct sockaddr *) &dev->backend_udp_dest, (socklen_t *)&slen); if (rc == -1) { vubr_die("recvfrom()"); } return rc; } static void vubr_consume_raw_packet(VubrDev *dev, uint8_t *buf, uint32_t len) { int hdrlen = sizeof(struct virtio_net_hdr_v1); if (VHOST_USER_BRIDGE_DEBUG) { print_buffer(buf, len); } vubr_backend_udp_sendbuf(dev, buf + hdrlen, len - hdrlen); } /* Kick the guest if necessary. */ static void vubr_virtqueue_kick(VubrVirtq *vq) { if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) { DPRINT("Kicking the guest...\n"); eventfd_write(vq->call_fd, 1); } } static void vubr_post_buffer(VubrDev *dev, VubrVirtq *vq, uint8_t *buf, int32_t len) { struct vring_desc *desc = vq->desc; struct vring_avail *avail = vq->avail; struct vring_used *used = vq->used; unsigned int size = vq->size; uint16_t avail_index = atomic_mb_read(&avail->idx); /* We check the available descriptors before posting the * buffer, so here we assume that enough available * descriptors. */ assert(vq->last_avail_index != avail_index); uint16_t a_index = vq->last_avail_index % size; uint16_t u_index = vq->last_used_index % size; uint16_t d_index = avail->ring[a_index]; int i = d_index; DPRINT("Post packet to guest on vq:\n"); DPRINT(" size = %d\n", vq->size); DPRINT(" last_avail_index = %d\n", vq->last_avail_index); DPRINT(" last_used_index = %d\n", vq->last_used_index); DPRINT(" a_index = %d\n", a_index); DPRINT(" u_index = %d\n", u_index); DPRINT(" d_index = %d\n", d_index); DPRINT(" desc[%d].addr = 0x%016"PRIx64"\n", i, desc[i].addr); DPRINT(" desc[%d].len = %d\n", i, desc[i].len); DPRINT(" desc[%d].flags = %d\n", i, desc[i].flags); DPRINT(" avail->idx = %d\n", avail_index); DPRINT(" used->idx = %d\n", used->idx); if (!(desc[i].flags & VRING_DESC_F_WRITE)) { /* FIXME: we should find writable descriptor. */ fprintf(stderr, "Error: descriptor is not writable. Exiting.\n"); exit(1); } void *chunk_start = (void *)gpa_to_va(dev, desc[i].addr); uint32_t chunk_len = desc[i].len; if (len <= chunk_len) { memcpy(chunk_start, buf, len); } else { fprintf(stderr, "Received too long packet from the backend. Dropping...\n"); return; } /* Add descriptor to the used ring. */ used->ring[u_index].id = d_index; used->ring[u_index].len = len; vq->last_avail_index++; vq->last_used_index++; atomic_mb_set(&used->idx, vq->last_used_index); /* Kick the guest if necessary. */ vubr_virtqueue_kick(vq); } static int vubr_process_desc(VubrDev *dev, VubrVirtq *vq) { struct vring_desc *desc = vq->desc; struct vring_avail *avail = vq->avail; struct vring_used *used = vq->used; unsigned int size = vq->size; uint16_t a_index = vq->last_avail_index % size; uint16_t u_index = vq->last_used_index % size; uint16_t d_index = avail->ring[a_index]; uint32_t i, len = 0; size_t buf_size = 4096; uint8_t buf[4096]; DPRINT("Chunks: "); i = d_index; do { void *chunk_start = (void *)gpa_to_va(dev, desc[i].addr); uint32_t chunk_len = desc[i].len; if (len + chunk_len < buf_size) { memcpy(buf + len, chunk_start, chunk_len); DPRINT("%d ", chunk_len); } else { fprintf(stderr, "Error: too long packet. Dropping...\n"); break; } len += chunk_len; if (!(desc[i].flags & VRING_DESC_F_NEXT)) { break; } i = desc[i].next; } while (1); DPRINT("\n"); if (!len) { return -1; } /* Add descriptor to the used ring. */ used->ring[u_index].id = d_index; used->ring[u_index].len = len; vubr_consume_raw_packet(dev, buf, len); return 0; } static void vubr_process_avail(VubrDev *dev, VubrVirtq *vq) { struct vring_avail *avail = vq->avail; struct vring_used *used = vq->used; while (vq->last_avail_index != atomic_mb_read(&avail->idx)) { vubr_process_desc(dev, vq); vq->last_avail_index++; vq->last_used_index++; } atomic_mb_set(&used->idx, vq->last_used_index); } static void vubr_backend_recv_cb(int sock, void *ctx) { VubrDev *dev = (VubrDev *) ctx; VubrVirtq *rx_vq = &dev->vq[0]; uint8_t buf[4096]; struct virtio_net_hdr_v1 *hdr = (struct virtio_net_hdr_v1 *)buf; int hdrlen = sizeof(struct virtio_net_hdr_v1); int buflen = sizeof(buf); int len; DPRINT("\n\n *** IN UDP RECEIVE CALLBACK ***\n\n"); uint16_t avail_index = atomic_mb_read(&rx_vq->avail->idx); /* If there is no available descriptors, just do nothing. * The buffer will be handled by next arrived UDP packet, * or next kick on receive virtq. */ if (rx_vq->last_avail_index == avail_index) { DPRINT("Got UDP packet, but no available descriptors on RX virtq.\n"); return; } len = vubr_backend_udp_recvbuf(dev, buf + hdrlen, buflen - hdrlen); *hdr = (struct virtio_net_hdr_v1) { }; hdr->num_buffers = 1; vubr_post_buffer(dev, rx_vq, buf, len + hdrlen); } static void vubr_kick_cb(int sock, void *ctx) { VubrDev *dev = (VubrDev *) ctx; eventfd_t kick_data; ssize_t rc; rc = eventfd_read(sock, &kick_data); if (rc == -1) { vubr_die("eventfd_read()"); } else { DPRINT("Got kick_data: %016"PRIx64"\n", kick_data); vubr_process_avail(dev, &dev->vq[1]); } } static int vubr_none_exec(VubrDev *dev, VhostUserMsg *vmsg) { DPRINT("Function %s() not implemented yet.\n", __func__); return 0; } static int vubr_get_features_exec(VubrDev *dev, VhostUserMsg *vmsg) { vmsg->payload.u64 = ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_NET_F_CTRL_VQ) | (1ULL << VIRTIO_NET_F_CTRL_RX) | (1ULL << VHOST_F_LOG_ALL)); vmsg->size = sizeof(vmsg->payload.u64); DPRINT("Sending back to guest u64: 0x%016"PRIx64"\n", vmsg->payload.u64); /* reply */ return 1; } static int vubr_set_features_exec(VubrDev *dev, VhostUserMsg *vmsg) { DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); return 0; } static int vubr_set_owner_exec(VubrDev *dev, VhostUserMsg *vmsg) { return 0; } static int vubr_reset_device_exec(VubrDev *dev, VhostUserMsg *vmsg) { DPRINT("Function %s() not implemented yet.\n", __func__); return 0; } static int vubr_set_mem_table_exec(VubrDev *dev, VhostUserMsg *vmsg) { int i; VhostUserMemory *memory = &vmsg->payload.memory; dev->nregions = memory->nregions; DPRINT("Nregions: %d\n", memory->nregions); for (i = 0; i < dev->nregions; i++) { void *mmap_addr; VhostUserMemoryRegion *msg_region = &memory->regions[i]; VubrDevRegion *dev_region = &dev->regions[i]; DPRINT("Region %d\n", i); DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n", msg_region->guest_phys_addr); DPRINT(" memory_size: 0x%016"PRIx64"\n", msg_region->memory_size); DPRINT(" userspace_addr 0x%016"PRIx64"\n", msg_region->userspace_addr); DPRINT(" mmap_offset 0x%016"PRIx64"\n", msg_region->mmap_offset); dev_region->gpa = msg_region->guest_phys_addr; dev_region->size = msg_region->memory_size; dev_region->qva = msg_region->userspace_addr; dev_region->mmap_offset = msg_region->mmap_offset; /* We don't use offset argument of mmap() since the * mapped address has to be page aligned, and we use huge * pages. */ mmap_addr = mmap(0, dev_region->size + dev_region->mmap_offset, PROT_READ | PROT_WRITE, MAP_SHARED, vmsg->fds[i], 0); if (mmap_addr == MAP_FAILED) { vubr_die("mmap"); } dev_region->mmap_addr = (uint64_t) mmap_addr; DPRINT(" mmap_addr: 0x%016"PRIx64"\n", dev_region->mmap_addr); } return 0; } static int vubr_set_log_base_exec(VubrDev *dev, VhostUserMsg *vmsg) { DPRINT("Function %s() not implemented yet.\n", __func__); return 0; } static int vubr_set_log_fd_exec(VubrDev *dev, VhostUserMsg *vmsg) { DPRINT("Function %s() not implemented yet.\n", __func__); return 0; } static int vubr_set_vring_num_exec(VubrDev *dev, VhostUserMsg *vmsg) { unsigned int index = vmsg->payload.state.index; unsigned int num = vmsg->payload.state.num; DPRINT("State.index: %d\n", index); DPRINT("State.num: %d\n", num); dev->vq[index].size = num; return 0; } static int vubr_set_vring_addr_exec(VubrDev *dev, VhostUserMsg *vmsg) { struct vhost_vring_addr *vra = &vmsg->payload.addr; unsigned int index = vra->index; VubrVirtq *vq = &dev->vq[index]; DPRINT("vhost_vring_addr:\n"); DPRINT(" index: %d\n", vra->index); DPRINT(" flags: %d\n", vra->flags); DPRINT(" desc_user_addr: 0x%016llx\n", vra->desc_user_addr); DPRINT(" used_user_addr: 0x%016llx\n", vra->used_user_addr); DPRINT(" avail_user_addr: 0x%016llx\n", vra->avail_user_addr); DPRINT(" log_guest_addr: 0x%016llx\n", vra->log_guest_addr); vq->desc = (struct vring_desc *)qva_to_va(dev, vra->desc_user_addr); vq->used = (struct vring_used *)qva_to_va(dev, vra->used_user_addr); vq->avail = (struct vring_avail *)qva_to_va(dev, vra->avail_user_addr); DPRINT("Setting virtq addresses:\n"); DPRINT(" vring_desc at %p\n", vq->desc); DPRINT(" vring_used at %p\n", vq->used); DPRINT(" vring_avail at %p\n", vq->avail); vq->last_used_index = vq->used->idx; return 0; } static int vubr_set_vring_base_exec(VubrDev *dev, VhostUserMsg *vmsg) { unsigned int index = vmsg->payload.state.index; unsigned int num = vmsg->payload.state.num; DPRINT("State.index: %d\n", index); DPRINT("State.num: %d\n", num); dev->vq[index].last_avail_index = num; return 0; } static int vubr_get_vring_base_exec(VubrDev *dev, VhostUserMsg *vmsg) { DPRINT("Function %s() not implemented yet.\n", __func__); return 0; } static int vubr_set_vring_kick_exec(VubrDev *dev, VhostUserMsg *vmsg) { uint64_t u64_arg = vmsg->payload.u64; int index = u64_arg & VHOST_USER_VRING_IDX_MASK; DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); assert((u64_arg & VHOST_USER_VRING_NOFD_MASK) == 0); assert(vmsg->fd_num == 1); dev->vq[index].kick_fd = vmsg->fds[0]; DPRINT("Got kick_fd: %d for vq: %d\n", vmsg->fds[0], index); if (index % 2 == 1) { /* TX queue. */ dispatcher_add(&dev->dispatcher, dev->vq[index].kick_fd, dev, vubr_kick_cb); DPRINT("Waiting for kicks on fd: %d for vq: %d\n", dev->vq[index].kick_fd, index); } return 0; } static int vubr_set_vring_call_exec(VubrDev *dev, VhostUserMsg *vmsg) { uint64_t u64_arg = vmsg->payload.u64; int index = u64_arg & VHOST_USER_VRING_IDX_MASK; DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); assert((u64_arg & VHOST_USER_VRING_NOFD_MASK) == 0); assert(vmsg->fd_num == 1); dev->vq[index].call_fd = vmsg->fds[0]; DPRINT("Got call_fd: %d for vq: %d\n", vmsg->fds[0], index); return 0; } static int vubr_set_vring_err_exec(VubrDev *dev, VhostUserMsg *vmsg) { DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); return 0; } static int vubr_get_protocol_features_exec(VubrDev *dev, VhostUserMsg *vmsg) { /* FIXME: unimplented */ DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); return 0; } static int vubr_set_protocol_features_exec(VubrDev *dev, VhostUserMsg *vmsg) { /* FIXME: unimplented */ DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); return 0; } static int vubr_get_queue_num_exec(VubrDev *dev, VhostUserMsg *vmsg) { DPRINT("Function %s() not implemented yet.\n", __func__); return 0; } static int vubr_set_vring_enable_exec(VubrDev *dev, VhostUserMsg *vmsg) { DPRINT("Function %s() not implemented yet.\n", __func__); return 0; } static int vubr_send_rarp_exec(VubrDev *dev, VhostUserMsg *vmsg) { DPRINT("Function %s() not implemented yet.\n", __func__); return 0; } static int vubr_execute_request(VubrDev *dev, VhostUserMsg *vmsg) { /* Print out generic part of the request. */ DPRINT( "================== Vhost user message from QEMU ==================\n"); DPRINT("Request: %s (%d)\n", vubr_request_str[vmsg->request], vmsg->request); DPRINT("Flags: 0x%x\n", vmsg->flags); DPRINT("Size: %d\n", vmsg->size); if (vmsg->fd_num) { int i; DPRINT("Fds:"); for (i = 0; i < vmsg->fd_num; i++) { DPRINT(" %d", vmsg->fds[i]); } DPRINT("\n"); } switch (vmsg->request) { case VHOST_USER_NONE: return vubr_none_exec(dev, vmsg); case VHOST_USER_GET_FEATURES: return vubr_get_features_exec(dev, vmsg); case VHOST_USER_SET_FEATURES: return vubr_set_features_exec(dev, vmsg); case VHOST_USER_SET_OWNER: return vubr_set_owner_exec(dev, vmsg); case VHOST_USER_RESET_DEVICE: return vubr_reset_device_exec(dev, vmsg); case VHOST_USER_SET_MEM_TABLE: return vubr_set_mem_table_exec(dev, vmsg); case VHOST_USER_SET_LOG_BASE: return vubr_set_log_base_exec(dev, vmsg); case VHOST_USER_SET_LOG_FD: return vubr_set_log_fd_exec(dev, vmsg); case VHOST_USER_SET_VRING_NUM: return vubr_set_vring_num_exec(dev, vmsg); case VHOST_USER_SET_VRING_ADDR: return vubr_set_vring_addr_exec(dev, vmsg); case VHOST_USER_SET_VRING_BASE: return vubr_set_vring_base_exec(dev, vmsg); case VHOST_USER_GET_VRING_BASE: return vubr_get_vring_base_exec(dev, vmsg); case VHOST_USER_SET_VRING_KICK: return vubr_set_vring_kick_exec(dev, vmsg); case VHOST_USER_SET_VRING_CALL: return vubr_set_vring_call_exec(dev, vmsg); case VHOST_USER_SET_VRING_ERR: return vubr_set_vring_err_exec(dev, vmsg); case VHOST_USER_GET_PROTOCOL_FEATURES: return vubr_get_protocol_features_exec(dev, vmsg); case VHOST_USER_SET_PROTOCOL_FEATURES: return vubr_set_protocol_features_exec(dev, vmsg); case VHOST_USER_GET_QUEUE_NUM: return vubr_get_queue_num_exec(dev, vmsg); case VHOST_USER_SET_VRING_ENABLE: return vubr_set_vring_enable_exec(dev, vmsg); case VHOST_USER_SEND_RARP: return vubr_send_rarp_exec(dev, vmsg); case VHOST_USER_MAX: assert(vmsg->request != VHOST_USER_MAX); } return 0; } static void vubr_receive_cb(int sock, void *ctx) { VubrDev *dev = (VubrDev *) ctx; VhostUserMsg vmsg; int reply_requested; vubr_message_read(sock, &vmsg); reply_requested = vubr_execute_request(dev, &vmsg); if (reply_requested) { /* Set the version in the flags when sending the reply */ vmsg.flags &= ~VHOST_USER_VERSION_MASK; vmsg.flags |= VHOST_USER_VERSION; vmsg.flags |= VHOST_USER_REPLY_MASK; vubr_message_write(sock, &vmsg); } } static void vubr_accept_cb(int sock, void *ctx) { VubrDev *dev = (VubrDev *)ctx; int conn_fd; struct sockaddr_un un; socklen_t len = sizeof(un); conn_fd = accept(sock, (struct sockaddr *) &un, &len); if (conn_fd == -1) { vubr_die("accept()"); } DPRINT("Got connection from remote peer on sock %d\n", conn_fd); dispatcher_add(&dev->dispatcher, conn_fd, ctx, vubr_receive_cb); } static VubrDev * vubr_new(const char *path) { VubrDev *dev = (VubrDev *) calloc(1, sizeof(VubrDev)); dev->nregions = 0; int i; struct sockaddr_un un; size_t len; for (i = 0; i < MAX_NR_VIRTQUEUE; i++) { dev->vq[i] = (VubrVirtq) { .call_fd = -1, .kick_fd = -1, .size = 0, .last_avail_index = 0, .last_used_index = 0, .desc = 0, .avail = 0, .used = 0, }; } /* Get a UNIX socket. */ dev->sock = socket(AF_UNIX, SOCK_STREAM, 0); if (dev->sock == -1) { vubr_die("socket"); } un.sun_family = AF_UNIX; strcpy(un.sun_path, path); len = sizeof(un.sun_family) + strlen(path); unlink(path); if (bind(dev->sock, (struct sockaddr *) &un, len) == -1) { vubr_die("bind"); } if (listen(dev->sock, 1) == -1) { vubr_die("listen"); } dispatcher_init(&dev->dispatcher); dispatcher_add(&dev->dispatcher, dev->sock, (void *)dev, vubr_accept_cb); DPRINT("Waiting for connections on UNIX socket %s ...\n", path); return dev; } static void vubr_backend_udp_setup(VubrDev *dev, const char *local_host, uint16_t local_port, const char *dest_host, uint16_t dest_port) { int sock; struct sockaddr_in si_local = { .sin_family = AF_INET, .sin_port = htons(local_port), }; if (inet_aton(local_host, &si_local.sin_addr) == 0) { fprintf(stderr, "inet_aton() failed.\n"); exit(1); } /* setup destination for sends */ dev->backend_udp_dest = (struct sockaddr_in) { .sin_family = AF_INET, .sin_port = htons(dest_port), }; if (inet_aton(dest_host, &dev->backend_udp_dest.sin_addr) == 0) { fprintf(stderr, "inet_aton() failed.\n"); exit(1); } sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (sock == -1) { vubr_die("socket"); } if (bind(sock, (struct sockaddr *)&si_local, sizeof(si_local)) == -1) { vubr_die("bind"); } dev->backend_udp_sock = sock; dispatcher_add(&dev->dispatcher, sock, dev, vubr_backend_recv_cb); DPRINT("Waiting for data from udp backend on %s:%d...\n", local_host, local_port); } static void vubr_run(VubrDev *dev) { while (1) { /* timeout 200ms */ dispatcher_wait(&dev->dispatcher, 200000); /* Here one can try polling strategy. */ } } int main(int argc, char *argv[]) { VubrDev *dev; dev = vubr_new("/tmp/vubr.sock"); if (!dev) { return 1; } vubr_backend_udp_setup(dev, "127.0.0.1", 4444, "127.0.0.1", 5555); vubr_run(dev); return 0; }