Adding qemu as a submodule of KVMFORNFV

This Patch includes the changes to add qemu as a submodule to
kvmfornfv repo and make use of the updated latest qemu for the
execution of all testcase
Change-Id: I1280af507a857675c7f81d30c95255635667bdd7
Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>

1 files changed, 0 insertions, 1418 deletions

diff --git a/qemu/tests/vhost-user-bridge.c b/qemu/tests/vhost-user-bridge.c
deleted file mode 100644
index 0779ba260..000000000
--- a/qemu/tests/vhost-user-bridge.c
+++ /dev/null
@@ -1,1418 +0,0 @@
-/*
- * Vhost User Bridge
- *
- * Copyright (c) 2015 Red Hat, Inc.
- *
- * Authors:
- *  Victor Kaplansky <victork@redhat.com>
- *
- * 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. Still not implemented:
- *          vubr_get_queue_num_exec()
- *          vubr_send_rarp_exec()
- *     - test for broken requests and virtqueue.
- *     - implement features defined by Virtio 1.0 spec.
- *     - support mergeable buffers and indirect descriptors.
- *     - implement clean shutdown.
- *     - implement non-blocking writes to UDP backend.
- *     - implement polling strategy.
- *     - implement clean starting/stopping of vq processing
- *     - implement clean starting/stopping of used and buffers
- *       dirty page logging.
- */
-
-#define _FILE_OFFSET_BITS 64
-
-#include "qemu/osdep.h"
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <sys/unistd.h>
-#include <sys/mman.h>
-#include <sys/eventfd.h>
-#include <arpa/inet.h>
-#include <netdb.h>
-#include <qemu/osdep.h>
-
-#include <linux/vhost.h>
-
-#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;
-}
-
-/* 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);
-    DPRINT("Sock %d removed from dispatcher watch.\n", sock);
-    return 0;
-}
-
-/* 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++) {
-        /* The callback on a socket can remove other sockets from the
-         * dispatcher, thus we have to check that the socket is
-         * still not removed from dispatcher's list
-         */
-        if (FD_ISSET(sock, &fdset) && FD_ISSET(sock, &dispr->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;
-    uint64_t log_guest_addr;
-    int enable;
-} VubrVirtq;
-
-/* Based on qemu/hw/virtio/vhost-user.c */
-
-#define VHOST_MEMORY_MAX_NREGIONS    8
-#define VHOST_USER_F_PROTOCOL_FEATURES 30
-/* v1.0 compliant. */
-#define VIRTIO_F_VERSION_1		32
-
-#define VHOST_LOG_PAGE 4096
-
-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_OWNER = 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 VhostUserLog {
-    uint64_t mmap_size;
-    uint64_t mmap_offset;
-} VhostUserLog;
-
-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;
-        VhostUserLog log;
-    } 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 log_call_fd;
-    uint64_t log_size;
-    uint8_t *log_table;
-    int backend_udp_sock;
-    struct sockaddr_in backend_udp_dest;
-    int ready;
-    uint64_t features;
-    int hdrlen;
-} 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_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_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");
-        fprintf(stderr, "Peer disconnected.\n");
-        exit(1);
-    }
-    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) = %zu\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");
-            fprintf(stderr, "Peer disconnected.\n");
-            exit(1);
-        }
-        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 = dev->hdrlen;
-    DPRINT("    hdrlen = %d\n", dev->hdrlen);
-
-    if (VHOST_USER_BRIDGE_DEBUG) {
-        print_buffer(buf, len);
-    }
-    vubr_backend_udp_sendbuf(dev, buf + hdrlen, len - hdrlen);
-}
-
-/* Kick the log_call_fd if required. */
-static void
-vubr_log_kick(VubrDev *dev)
-{
-    if (dev->log_call_fd != -1) {
-        DPRINT("Kicking the QEMU's log...\n");
-        eventfd_write(dev->log_call_fd, 1);
-    }
-}
-
-/* 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_log_page(uint8_t *log_table, uint64_t page)
-{
-    DPRINT("Logged dirty guest page: %"PRId64"\n", page);
-    atomic_or(&log_table[page / 8], 1 << (page % 8));
-}
-
-static void
-vubr_log_write(VubrDev *dev, uint64_t address, uint64_t length)
-{
-    uint64_t page;
-
-    if (!(dev->features & (1ULL << VHOST_F_LOG_ALL)) ||
-        !dev->log_table || !length) {
-        return;
-    }
-
-    assert(dev->log_size > ((address + length - 1) / VHOST_LOG_PAGE / 8));
-
-    page = address / VHOST_LOG_PAGE;
-    while (page * VHOST_LOG_PAGE < address + length) {
-        vubr_log_page(dev->log_table, page);
-        page += VHOST_LOG_PAGE;
-    }
-    vubr_log_kick(dev);
-}
-
-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;
-    uint64_t log_guest_addr = vq->log_guest_addr;
-    int32_t remaining_len = len;
-
-    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;
-    uint32_t written_len = 0;
-
-    do {
-        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 *)(uintptr_t)gpa_to_va(dev, desc[i].addr);
-        uint32_t chunk_len = desc[i].len;
-        uint32_t chunk_write_len = MIN(remaining_len, chunk_len);
-
-        memcpy(chunk_start, buf + written_len, chunk_write_len);
-        vubr_log_write(dev, desc[i].addr, chunk_write_len);
-        remaining_len -= chunk_write_len;
-        written_len += chunk_write_len;
-
-        if ((remaining_len == 0) || !(desc[i].flags & VRING_DESC_F_NEXT)) {
-            break;
-        }
-
-        i = desc[i].next;
-    } while (1);
-
-    if (remaining_len > 0) {
-            fprintf(stderr,
-                    "Too long packet for RX, remaining_len = %d, Dropping...\n",
-                    remaining_len);
-            return;
-    }
-
-    /* Add descriptor to the used ring. */
-    used->ring[u_index].id = d_index;
-    used->ring[u_index].len = len;
-    vubr_log_write(dev,
-                   log_guest_addr + offsetof(struct vring_used, ring[u_index]),
-                   sizeof(used->ring[u_index]));
-
-    vq->last_avail_index++;
-    vq->last_used_index++;
-
-    atomic_mb_set(&used->idx, vq->last_used_index);
-    vubr_log_write(dev,
-                   log_guest_addr + offsetof(struct vring_used, idx),
-                   sizeof(used->idx));
-
-    /* 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;
-    uint64_t log_guest_addr = vq->log_guest_addr;
-
-    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 *)(uintptr_t)gpa_to_va(dev, desc[i].addr);
-        uint32_t chunk_len = desc[i].len;
-
-        assert(!(desc[i].flags & VRING_DESC_F_WRITE));
-
-        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_log_write(dev,
-                   log_guest_addr + offsetof(struct vring_used, ring[u_index]),
-                   sizeof(used->ring[u_index]));
-
-    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;
-    uint64_t log_guest_addr = vq->log_guest_addr;
-
-    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);
-    vubr_log_write(dev,
-                   log_guest_addr + offsetof(struct vring_used, idx),
-                   sizeof(used->idx));
-}
-
-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 = dev->hdrlen;
-    int buflen = sizeof(buf);
-    int len;
-
-    if (!dev->ready) {
-        return;
-    }
-
-    DPRINT("\n\n   ***   IN UDP RECEIVE CALLBACK    ***\n\n");
-    DPRINT("    hdrlen = %d\n", hdrlen);
-
-    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;
-    }
-
-    memset(buf, 0, hdrlen);
-    /* TODO: support mergeable buffers. */
-    if (hdrlen == 12)
-        hdr->num_buffers = 1;
-    len = vubr_backend_udp_recvbuf(dev, buf + hdrlen, buflen - hdrlen);
-
-    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 << VHOST_F_LOG_ALL) |
-             (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) |
-             (1ULL << VHOST_USER_F_PROTOCOL_FEATURES));
-
-    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);
-
-    dev->features = vmsg->payload.u64;
-    if ((dev->features & (1ULL << VIRTIO_F_VERSION_1)) ||
-        (dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF))) {
-        dev->hdrlen = 12;
-    } else {
-        dev->hdrlen = 10;
-    }
-
-    return 0;
-}
-
-static int
-vubr_set_owner_exec(VubrDev *dev, VhostUserMsg *vmsg)
-{
-    return 0;
-}
-
-static void
-vubr_close_log(VubrDev *dev)
-{
-    if (dev->log_table) {
-        if (munmap(dev->log_table, dev->log_size) != 0) {
-            vubr_die("munmap()");
-        }
-
-        dev->log_table = 0;
-    }
-    if (dev->log_call_fd != -1) {
-        close(dev->log_call_fd);
-        dev->log_call_fd = -1;
-    }
-}
-
-static int
-vubr_reset_device_exec(VubrDev *dev, VhostUserMsg *vmsg)
-{
-    vubr_close_log(dev);
-    dev->ready = 0;
-    dev->features = 0;
-    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)(uintptr_t)mmap_addr;
-        DPRINT("    mmap_addr:       0x%016"PRIx64"\n", dev_region->mmap_addr);
-
-        close(vmsg->fds[i]);
-    }
-
-    return 0;
-}
-
-static int
-vubr_set_log_base_exec(VubrDev *dev, VhostUserMsg *vmsg)
-{
-    int fd;
-    uint64_t log_mmap_size, log_mmap_offset;
-    void *rc;
-
-    assert(vmsg->fd_num == 1);
-    fd = vmsg->fds[0];
-
-    assert(vmsg->size == sizeof(vmsg->payload.log));
-    log_mmap_offset = vmsg->payload.log.mmap_offset;
-    log_mmap_size = vmsg->payload.log.mmap_size;
-    DPRINT("Log mmap_offset: %"PRId64"\n", log_mmap_offset);
-    DPRINT("Log mmap_size:   %"PRId64"\n", log_mmap_size);
-
-    rc = mmap(0, log_mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
-              log_mmap_offset);
-    if (rc == MAP_FAILED) {
-        vubr_die("mmap");
-    }
-    dev->log_table = rc;
-    dev->log_size = log_mmap_size;
-
-    vmsg->size = sizeof(vmsg->payload.u64);
-    /* Reply */
-    return 1;
-}
-
-static int
-vubr_set_log_fd_exec(VubrDev *dev, VhostUserMsg *vmsg)
-{
-    assert(vmsg->fd_num == 1);
-    dev->log_call_fd = vmsg->fds[0];
-    DPRINT("Got log_call_fd: %d\n", vmsg->fds[0]);
-    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 *)(uintptr_t)qva_to_va(dev, vra->desc_user_addr);
-    vq->used = (struct vring_used *)(uintptr_t)qva_to_va(dev, vra->used_user_addr);
-    vq->avail = (struct vring_avail *)(uintptr_t)qva_to_va(dev, vra->avail_user_addr);
-    vq->log_guest_addr = vra->log_guest_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)
-{
-    unsigned int index = vmsg->payload.state.index;
-
-    DPRINT("State.index: %d\n", index);
-    vmsg->payload.state.num = dev->vq[index].last_avail_index;
-    vmsg->size = sizeof(vmsg->payload.state);
-    /* FIXME: this is a work-around for a bug in QEMU enabling
-     * too early vrings. When protocol features are enabled,
-     * we have to respect * VHOST_USER_SET_VRING_ENABLE request. */
-    dev->ready = 0;
-
-    if (dev->vq[index].call_fd != -1) {
-        close(dev->vq[index].call_fd);
-        dispatcher_remove(&dev->dispatcher, dev->vq[index].call_fd);
-        dev->vq[index].call_fd = -1;
-    }
-    if (dev->vq[index].kick_fd != -1) {
-        close(dev->vq[index].kick_fd);
-        dispatcher_remove(&dev->dispatcher, dev->vq[index].kick_fd);
-        dev->vq[index].kick_fd = -1;
-    }
-
-    /* Reply */
-    return 1;
-}
-
-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);
-
-    if (dev->vq[index].kick_fd != -1) {
-        close(dev->vq[index].kick_fd);
-        dispatcher_remove(&dev->dispatcher, dev->vq[index].kick_fd);
-    }
-    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);
-    }
-    /* We temporarily use this hack to determine that both TX and RX
-     * queues are set up and ready for processing.
-     * FIXME: we need to rely in VHOST_USER_SET_VRING_ENABLE and
-     * actual kicks. */
-    if (dev->vq[0].kick_fd != -1 &&
-        dev->vq[1].kick_fd != -1) {
-        dev->ready = 1;
-        DPRINT("vhost-user-bridge is ready for processing queues.\n");
-    }
-    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);
-
-    if (dev->vq[index].call_fd != -1) {
-        close(dev->vq[index].call_fd);
-        dispatcher_remove(&dev->dispatcher, dev->vq[index].call_fd);
-    }
-    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)
-{
-    vmsg->payload.u64 = 1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD;
-    DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
-    vmsg->size = sizeof(vmsg->payload.u64);
-
-    /* Reply */
-    return 1;
-}
-
-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)
-{
-    unsigned int index = vmsg->payload.state.index;
-    unsigned int enable = vmsg->payload.state.num;
-
-    DPRINT("State.index: %d\n", index);
-    DPRINT("State.enable:   %d\n", enable);
-    dev->vq[index].enable = enable;
-    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_OWNER:
-        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,
-            .enable = 0,
-        };
-    }
-
-    /* Init log */
-    dev->log_call_fd = -1;
-    dev->log_size = 0;
-    dev->log_table = 0;
-    dev->ready = 0;
-    dev->features = 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_set_host(struct sockaddr_in *saddr, const char *host)
-{
-    if (isdigit(host[0])) {
-        if (!inet_aton(host, &saddr->sin_addr)) {
-            fprintf(stderr, "inet_aton() failed.\n");
-            exit(1);
-        }
-    } else {
-        struct hostent *he = gethostbyname(host);
-
-        if (!he) {
-            fprintf(stderr, "gethostbyname() failed.\n");
-            exit(1);
-        }
-        saddr->sin_addr = *(struct in_addr *)he->h_addr;
-    }
-}
-
-static void
-vubr_backend_udp_setup(VubrDev *dev,
-                       const char *local_host,
-                       const char *local_port,
-                       const char *remote_host,
-                       const char *remote_port)
-{
-    int sock;
-    const char *r;
-
-    int lport, rport;
-
-    lport = strtol(local_port, (char **)&r, 0);
-    if (r == local_port) {
-        fprintf(stderr, "lport parsing failed.\n");
-        exit(1);
-    }
-
-    rport = strtol(remote_port, (char **)&r, 0);
-    if (r == remote_port) {
-        fprintf(stderr, "rport parsing failed.\n");
-        exit(1);
-    }
-
-    struct sockaddr_in si_local = {
-        .sin_family = AF_INET,
-        .sin_port = htons(lport),
-    };
-
-    vubr_set_host(&si_local, local_host);
-
-    /* setup destination for sends */
-    dev->backend_udp_dest = (struct sockaddr_in) {
-        .sin_family = AF_INET,
-        .sin_port = htons(rport),
-    };
-    vubr_set_host(&dev->backend_udp_dest, remote_host);
-
-    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, lport);
-}
-
-static void
-vubr_run(VubrDev *dev)
-{
-    while (1) {
-        /* timeout 200ms */
-        dispatcher_wait(&dev->dispatcher, 200000);
-        /* Here one can try polling strategy. */
-    }
-}
-
-static int
-vubr_parse_host_port(const char **host, const char **port, const char *buf)
-{
-    char *p = strchr(buf, ':');
-
-    if (!p) {
-        return -1;
-    }
-    *p = '\0';
-    *host = strdup(buf);
-    *port = strdup(p + 1);
-    return 0;
-}
-
-#define DEFAULT_UD_SOCKET "/tmp/vubr.sock"
-#define DEFAULT_LHOST "127.0.0.1"
-#define DEFAULT_LPORT "4444"
-#define DEFAULT_RHOST "127.0.0.1"
-#define DEFAULT_RPORT "5555"
-
-static const char *ud_socket_path = DEFAULT_UD_SOCKET;
-static const char *lhost = DEFAULT_LHOST;
-static const char *lport = DEFAULT_LPORT;
-static const char *rhost = DEFAULT_RHOST;
-static const char *rport = DEFAULT_RPORT;
-
-int
-main(int argc, char *argv[])
-{
-    VubrDev *dev;
-    int opt;
-
-    while ((opt = getopt(argc, argv, "l:r:u:")) != -1) {
-
-        switch (opt) {
-        case 'l':
-            if (vubr_parse_host_port(&lhost, &lport, optarg) < 0) {
-                goto out;
-            }
-            break;
-        case 'r':
-            if (vubr_parse_host_port(&rhost, &rport, optarg) < 0) {
-                goto out;
-            }
-            break;
-        case 'u':
-            ud_socket_path = strdup(optarg);
-            break;
-        default:
-            goto out;
-        }
-    }
-
-    DPRINT("ud socket: %s\n", ud_socket_path);
-    DPRINT("local:     %s:%s\n", lhost, lport);
-    DPRINT("remote:    %s:%s\n", rhost, rport);
-
-    dev = vubr_new(ud_socket_path);
-    if (!dev) {
-        return 1;
-    }
-
-    vubr_backend_udp_setup(dev, lhost, lport, rhost, rport);
-    vubr_run(dev);
-    return 0;
-
-out:
-    fprintf(stderr, "Usage: %s ", argv[0]);
-    fprintf(stderr, "[-u ud_socket_path] [-l lhost:lport] [-r rhost:rport]\n");
-    fprintf(stderr, "\t-u path to unix doman socket. default: %s\n",
-            DEFAULT_UD_SOCKET);
-    fprintf(stderr, "\t-l local host and port. default: %s:%s\n",
-            DEFAULT_LHOST, DEFAULT_LPORT);
-    fprintf(stderr, "\t-r remote host and port. default: %s:%s\n",
-            DEFAULT_RHOST, DEFAULT_RPORT);
-
-    return 1;
-}