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qemu/contrib/vhost-user-scsi/vhost-user-scsi.c
Felipe Franciosi 49cc0340f8 vhost-user-scsi: Introduce a vhost-user-scsi sample application 
This commit introduces a vhost-user-scsi backend sample application. It
must be linked with libiscsi and libvhost-user.

To use it, compile with:
  $ make vhost-user-scsi

And run as follows:
  $ ./vhost-user-scsi -u vus.sock -i iscsi://uri_to_target/
  $ qemu-system-x86_64 --enable-kvm -m 512 \
      -object memory-backend-file,id=mem,size=512m,share=on,mem-path=guestmem \
      -numa node,memdev=mem \
      -chardev socket,id=vhost-user-scsi,path=vus.sock \
      -device vhost-user-scsi-pci,chardev=vhost-user-scsi \

The application is currently limited at one LUN only and it processes
requests synchronously (therefore only achieving QD1). The purpose of
the code is to show how a backend can be implemented and to test the
vhost-user-scsi Qemu implementation.

If a different instance of this vhost-user-scsi application is executed
at a remote host, a VM can be live migrated to such a host.

Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
Message-Id: <1488479153-21203-5-git-send-email-felipe@nutanix.com>
2017-06-15 11:18:40 +02:00

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/*
* vhost-user-scsi sample application
*
* Copyright (c) 2016 Nutanix Inc. All rights reserved.
*
* Author:
* Felipe Franciosi <felipe@nutanix.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 only.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "contrib/libvhost-user/libvhost-user.h"
#include "hw/virtio/virtio-scsi.h"
#include "iscsi/iscsi.h"
#include <glib.h>
/* Small compat shim from glib 2.32 */
#ifndef G_SOURCE_CONTINUE
#define G_SOURCE_CONTINUE TRUE
#endif
#ifndef G_SOURCE_REMOVE
#define G_SOURCE_REMOVE FALSE
#endif
/* #define VUS_DEBUG 1 */
/** Log helpers **/
#define PPRE \
struct timespec ts; \
char timebuf[64]; \
struct tm tm; \
(void)clock_gettime(CLOCK_REALTIME, &ts); \
(void)strftime(timebuf, 64, "%Y%m%d %T", gmtime_r(&ts.tv_sec, &tm))
#define PEXT(lvl, msg, ...) do { \
PPRE; \
fprintf(stderr, "%s.%06ld " lvl ": %s:%s():%d: " msg "\n", \
timebuf, ts.tv_nsec / 1000, \
__FILE__, __func__, __LINE__, ## __VA_ARGS__); \
} while (0)
#define PNOR(lvl, msg, ...) do { \
PPRE; \
fprintf(stderr, "%s.%06ld " lvl ": " msg "\n", \
timebuf, ts.tv_nsec / 1000, ## __VA_ARGS__); \
} while (0)
#ifdef VUS_DEBUG
#define PDBG(msg, ...) PEXT("DBG", msg, ## __VA_ARGS__)
#define PERR(msg, ...) PEXT("ERR", msg, ## __VA_ARGS__)
#define PLOG(msg, ...) PEXT("LOG", msg, ## __VA_ARGS__)
#else
#define PDBG(msg, ...) { }
#define PERR(msg, ...) PNOR("ERR", msg, ## __VA_ARGS__)
#define PLOG(msg, ...) PNOR("LOG", msg, ## __VA_ARGS__)
#endif
/** vhost-user-scsi specific definitions **/
/* Only 1 LUN and device supported today */
#define VUS_MAX_LUNS 1
#define VUS_MAX_DEVS 1
#define VUS_ISCSI_INITIATOR "iqn.2016-11.com.nutanix:vhost-user-scsi"
typedef struct iscsi_lun {
struct iscsi_context *iscsi_ctx;
int iscsi_lun;
} iscsi_lun_t;
typedef struct vhost_scsi_dev {
VuDev vu_dev;
int server_sock;
GMainLoop *loop;
GTree *fdmap; /* fd -> gsource context id */
iscsi_lun_t luns[VUS_MAX_LUNS];
} vhost_scsi_dev_t;
static vhost_scsi_dev_t *vhost_scsi_devs[VUS_MAX_DEVS];
/** glib event loop integration for libvhost-user and misc callbacks **/
QEMU_BUILD_BUG_ON((int)G_IO_IN != (int)VU_WATCH_IN);
QEMU_BUILD_BUG_ON((int)G_IO_OUT != (int)VU_WATCH_OUT);
QEMU_BUILD_BUG_ON((int)G_IO_PRI != (int)VU_WATCH_PRI);
QEMU_BUILD_BUG_ON((int)G_IO_ERR != (int)VU_WATCH_ERR);
QEMU_BUILD_BUG_ON((int)G_IO_HUP != (int)VU_WATCH_HUP);
typedef struct vus_gsrc {
GSource parent;
vhost_scsi_dev_t *vdev_scsi;
GPollFD gfd;
vu_watch_cb vu_cb;
} vus_gsrc_t;
static gint vus_fdmap_compare(gconstpointer a, gconstpointer b)
{
return (b > a) - (b < a);
}
static gboolean vus_gsrc_prepare(GSource *src, gint *timeout)
{
assert(timeout);
*timeout = -1;
return FALSE;
}
static gboolean vus_gsrc_check(GSource *src)
{
vus_gsrc_t *vus_src = (vus_gsrc_t *)src;
assert(vus_src);
return vus_src->gfd.revents & vus_src->gfd.events;
}
static gboolean vus_gsrc_dispatch(GSource *src, GSourceFunc cb, gpointer data)
{
vhost_scsi_dev_t *vdev_scsi;
vus_gsrc_t *vus_src = (vus_gsrc_t *)src;
assert(vus_src);
assert(!(vus_src->vu_cb && cb));
vdev_scsi = vus_src->vdev_scsi;
assert(vdev_scsi);
if (cb) {
return cb(data);
}
if (vus_src->vu_cb) {
vus_src->vu_cb(&vdev_scsi->vu_dev, vus_src->gfd.revents, data);
}
return G_SOURCE_CONTINUE;
}
static GSourceFuncs vus_gsrc_funcs = {
vus_gsrc_prepare,
vus_gsrc_check,
vus_gsrc_dispatch,
NULL
};
static int vus_gsrc_new(vhost_scsi_dev_t *vdev_scsi, int fd, GIOCondition cond,
vu_watch_cb vu_cb, GSourceFunc gsrc_cb, gpointer data)
{
GSource *vus_gsrc;
vus_gsrc_t *vus_src;
guint id;
assert(vdev_scsi);
assert(fd >= 0);
assert(vu_cb || gsrc_cb);
assert(!(vu_cb && gsrc_cb));
vus_gsrc = g_source_new(&vus_gsrc_funcs, sizeof(vus_gsrc_t));
if (!vus_gsrc) {
PERR("Error creating GSource for new watch");
return -1;
}
vus_src = (vus_gsrc_t *)vus_gsrc;
vus_src->vdev_scsi = vdev_scsi;
vus_src->gfd.fd = fd;
vus_src->gfd.events = cond;
vus_src->vu_cb = vu_cb;
g_source_add_poll(vus_gsrc, &vus_src->gfd);
g_source_set_callback(vus_gsrc, gsrc_cb, data, NULL);
id = g_source_attach(vus_gsrc, NULL);
assert(id);
g_source_unref(vus_gsrc);
g_tree_insert(vdev_scsi->fdmap, (gpointer)(uintptr_t)fd,
(gpointer)(uintptr_t)id);
return 0;
}
/* from libiscsi's scsi-lowlevel.h **
*
* nb. We can't directly include scsi-lowlevel.h due to a namespace conflict:
* QEMU's scsi.h also defines "SCSI_XFER_NONE".
*/
#define SCSI_CDB_MAX_SIZE 16
struct scsi_iovector {
struct scsi_iovec *iov;
int niov;
int nalloc;
size_t offset;
int consumed;
};
struct scsi_allocated_memory {
struct scsi_allocated_memory *next;
char buf[0];
};
struct scsi_data {
int size;
unsigned char *data;
};
enum scsi_sense_key {
SCSI_SENSE_NO_SENSE = 0x00,
SCSI_SENSE_RECOVERED_ERROR = 0x01,
SCSI_SENSE_NOT_READY = 0x02,
SCSI_SENSE_MEDIUM_ERROR = 0x03,
SCSI_SENSE_HARDWARE_ERROR = 0x04,
SCSI_SENSE_ILLEGAL_REQUEST = 0x05,
SCSI_SENSE_UNIT_ATTENTION = 0x06,
SCSI_SENSE_DATA_PROTECTION = 0x07,
SCSI_SENSE_BLANK_CHECK = 0x08,
SCSI_SENSE_VENDOR_SPECIFIC = 0x09,
SCSI_SENSE_COPY_ABORTED = 0x0a,
SCSI_SENSE_COMMAND_ABORTED = 0x0b,
SCSI_SENSE_OBSOLETE_ERROR_CODE = 0x0c,
SCSI_SENSE_OVERFLOW_COMMAND = 0x0d,
SCSI_SENSE_MISCOMPARE = 0x0e
};
struct scsi_sense {
unsigned char error_type;
enum scsi_sense_key key;
int ascq;
unsigned sense_specific:1;
unsigned ill_param_in_cdb:1;
unsigned bit_pointer_valid:1;
unsigned char bit_pointer;
uint16_t field_pointer;
};
enum scsi_residual {
SCSI_RESIDUAL_NO_RESIDUAL = 0,
SCSI_RESIDUAL_UNDERFLOW,
SCSI_RESIDUAL_OVERFLOW
};
struct scsi_task {
int status;
int cdb_size;
int xfer_dir;
int expxferlen;
unsigned char cdb[SCSI_CDB_MAX_SIZE];
enum scsi_residual residual_status;
size_t residual;
struct scsi_sense sense;
struct scsi_data datain;
struct scsi_allocated_memory *mem;
void *ptr;
uint32_t itt;
uint32_t cmdsn;
uint32_t lun;
struct scsi_iovector iovector_in;
struct scsi_iovector iovector_out;
};
/** libiscsi integration **/
static int iscsi_add_lun(iscsi_lun_t *lun, char *iscsi_uri)
{
struct iscsi_url *iscsi_url;
struct iscsi_context *iscsi_ctx;
int ret = 0;
assert(lun);
assert(iscsi_uri);
iscsi_ctx = iscsi_create_context(VUS_ISCSI_INITIATOR);
if (!iscsi_ctx) {
PERR("Unable to create iSCSI context");
return -1;
}
iscsi_url = iscsi_parse_full_url(iscsi_ctx, iscsi_uri);
if (!iscsi_url) {
PERR("Unable to parse iSCSI URL: %s", iscsi_get_error(iscsi_ctx));
goto fail;
}
iscsi_set_session_type(iscsi_ctx, ISCSI_SESSION_NORMAL);
iscsi_set_header_digest(iscsi_ctx, ISCSI_HEADER_DIGEST_NONE_CRC32C);
if (iscsi_full_connect_sync(iscsi_ctx, iscsi_url->portal, iscsi_url->lun)) {
PERR("Unable to login to iSCSI portal: %s", iscsi_get_error(iscsi_ctx));
goto fail;
}
lun->iscsi_ctx = iscsi_ctx;
lun->iscsi_lun = iscsi_url->lun;
PDBG("Context %p created for lun 0: %s", iscsi_ctx, iscsi_uri);
out:
if (iscsi_url) {
iscsi_destroy_url(iscsi_url);
}
return ret;
fail:
(void)iscsi_destroy_context(iscsi_ctx);
ret = -1;
goto out;
}
static struct scsi_task *scsi_task_new(int cdb_len, uint8_t *cdb, int dir,
int xfer_len) {
struct scsi_task *task;
assert(cdb_len > 0);
assert(cdb);
task = calloc(1, sizeof(struct scsi_task));
if (!task) {
PERR("Error allocating task: %s", strerror(errno));
return NULL;
}
memcpy(task->cdb, cdb, cdb_len);
task->cdb_size = cdb_len;
task->xfer_dir = dir;
task->expxferlen = xfer_len;
return task;
}
static int get_cdb_len(uint8_t *cdb)
{
assert(cdb);
switch (cdb[0] >> 5) {
case 0: return 6;
case 1: /* fall through */
case 2: return 10;
case 4: return 16;
case 5: return 12;
}
PERR("Unable to determine cdb len (0x%02hhX)", cdb[0] >> 5);
return -1;
}
static int handle_cmd_sync(struct iscsi_context *ctx,
VirtIOSCSICmdReq *req,
struct iovec *out, unsigned int out_len,
VirtIOSCSICmdResp *rsp,
struct iovec *in, unsigned int in_len) {
struct scsi_task *task;
uint32_t dir;
uint32_t len;
int cdb_len;
int i;
assert(ctx);
assert(req);
assert(rsp);
if (!(!req->lun[1] && req->lun[2] == 0x40 && !req->lun[3])) {
/* Ignore anything different than target=0, lun=0 */
PDBG("Ignoring unconnected lun (0x%hhX, 0x%hhX)",
req->lun[1], req->lun[3]);
rsp->status = SCSI_STATUS_CHECK_CONDITION;
memset(rsp->sense, 0, sizeof(rsp->sense));
rsp->sense_len = 18;
rsp->sense[0] = 0x70;
rsp->sense[2] = SCSI_SENSE_ILLEGAL_REQUEST;
rsp->sense[7] = 10;
rsp->sense[12] = 0x24;
return 0;
}
cdb_len = get_cdb_len(req->cdb);
if (cdb_len == -1) {
return -1;
}
len = 0;
if (!out_len && !in_len) {
dir = SCSI_XFER_NONE;
} else if (out_len) {
dir = SCSI_XFER_TO_DEV;
for (i = 0; i < out_len; i++) {
len += out[i].iov_len;
}
} else {
dir = SCSI_XFER_FROM_DEV;
for (i = 0; i < in_len; i++) {
len += in[i].iov_len;
}
}
task = scsi_task_new(cdb_len, req->cdb, dir, len);
if (!task) {
PERR("Unable to create iscsi task");
return -1;
}
if (dir == SCSI_XFER_TO_DEV) {
task->iovector_out.iov = (struct scsi_iovec *)out;
task->iovector_out.niov = out_len;
} else if (dir == SCSI_XFER_FROM_DEV) {
task->iovector_in.iov = (struct scsi_iovec *)in;
task->iovector_in.niov = in_len;
}
PDBG("Sending iscsi cmd (cdb_len=%d, dir=%d, task=%p)",
cdb_len, dir, task);
if (!iscsi_scsi_command_sync(ctx, 0, task, NULL)) {
PERR("Error serving SCSI command");
free(task);
return -1;
}
memset(rsp, 0, sizeof(*rsp));
rsp->status = task->status;
rsp->resid = task->residual;
if (task->status == SCSI_STATUS_CHECK_CONDITION) {
rsp->response = VIRTIO_SCSI_S_FAILURE;
rsp->sense_len = task->datain.size - 2;
memcpy(rsp->sense, &task->datain.data[2], rsp->sense_len);
}
free(task);
PDBG("Filled in rsp: status=%hhX, resid=%u, response=%hhX, sense_len=%u",
rsp->status, rsp->resid, rsp->response, rsp->sense_len);
return 0;
}
/** libvhost-user callbacks **/
static vhost_scsi_dev_t *vdev_scsi_find_by_vu(VuDev *vu_dev);
static void vus_panic_cb(VuDev *vu_dev, const char *buf)
{
vhost_scsi_dev_t *vdev_scsi;
assert(vu_dev);
vdev_scsi = vdev_scsi_find_by_vu(vu_dev);
if (buf) {
PERR("vu_panic: %s", buf);
}
if (vdev_scsi) {
assert(vdev_scsi->loop);
g_main_loop_quit(vdev_scsi->loop);
}
}
static void vus_add_watch_cb(VuDev *vu_dev, int fd, int vu_evt, vu_watch_cb cb,
void *pvt) {
vhost_scsi_dev_t *vdev_scsi;
guint id;
assert(vu_dev);
assert(fd >= 0);
assert(cb);
vdev_scsi = vdev_scsi_find_by_vu(vu_dev);
if (!vdev_scsi) {
vus_panic_cb(vu_dev, NULL);
return;
}
id = (guint)(uintptr_t)g_tree_lookup(vdev_scsi->fdmap,
(gpointer)(uintptr_t)fd);
if (id) {
GSource *vus_src = g_main_context_find_source_by_id(NULL, id);
assert(vus_src);
g_source_destroy(vus_src);
(void)g_tree_remove(vdev_scsi->fdmap, (gpointer)(uintptr_t)fd);
}
if (vus_gsrc_new(vdev_scsi, fd, vu_evt, cb, NULL, pvt)) {
vus_panic_cb(vu_dev, NULL);
}
}
static void vus_del_watch_cb(VuDev *vu_dev, int fd)
{
vhost_scsi_dev_t *vdev_scsi;
guint id;
assert(vu_dev);
assert(fd >= 0);
vdev_scsi = vdev_scsi_find_by_vu(vu_dev);
if (!vdev_scsi) {
vus_panic_cb(vu_dev, NULL);
return;
}
id = (guint)(uintptr_t)g_tree_lookup(vdev_scsi->fdmap,
(gpointer)(uintptr_t)fd);
if (id) {
GSource *vus_src = g_main_context_find_source_by_id(NULL, id);
assert(vus_src);
g_source_destroy(vus_src);
(void)g_tree_remove(vdev_scsi->fdmap, (gpointer)(uintptr_t)fd);
}
}
static void vus_proc_ctl(VuDev *vu_dev, int idx)
{
/* Control VQ not implemented */
}
static void vus_proc_evt(VuDev *vu_dev, int idx)
{
/* Event VQ not implemented */
}
static void vus_proc_req(VuDev *vu_dev, int idx)
{
vhost_scsi_dev_t *vdev_scsi;
VuVirtq *vq;
assert(vu_dev);
vdev_scsi = vdev_scsi_find_by_vu(vu_dev);
if (!vdev_scsi) {
vus_panic_cb(vu_dev, NULL);
return;
}
if ((idx < 0) || (idx >= VHOST_MAX_NR_VIRTQUEUE)) {
PERR("VQ Index out of range: %d", idx);
vus_panic_cb(vu_dev, NULL);
return;
}
vq = vu_get_queue(vu_dev, idx);
if (!vq) {
PERR("Error fetching VQ (dev=%p, idx=%d)", vu_dev, idx);
vus_panic_cb(vu_dev, NULL);
return;
}
PDBG("Got kicked on vq[%d]@%p", idx, vq);
while (1) {
VuVirtqElement *elem;
VirtIOSCSICmdReq *req;
VirtIOSCSICmdResp *rsp;
elem = vu_queue_pop(vu_dev, vq, sizeof(VuVirtqElement));
if (!elem) {
PDBG("No more elements pending on vq[%d]@%p", idx, vq);
break;
}
PDBG("Popped elem@%p", elem);
assert(!((elem->out_num > 1) && (elem->in_num > 1)));
assert((elem->out_num > 0) && (elem->in_num > 0));
if (elem->out_sg[0].iov_len < sizeof(VirtIOSCSICmdReq)) {
PERR("Invalid virtio-scsi req header");
vus_panic_cb(vu_dev, NULL);
break;
}
req = (VirtIOSCSICmdReq *)elem->out_sg[0].iov_base;
if (elem->in_sg[0].iov_len < sizeof(VirtIOSCSICmdResp)) {
PERR("Invalid virtio-scsi rsp header");
vus_panic_cb(vu_dev, NULL);
break;
}
rsp = (VirtIOSCSICmdResp *)elem->in_sg[0].iov_base;
if (handle_cmd_sync(vdev_scsi->luns[0].iscsi_ctx,
req, &elem->out_sg[1], elem->out_num - 1,
rsp, &elem->in_sg[1], elem->in_num - 1) != 0) {
vus_panic_cb(vu_dev, NULL);
break;
}
vu_queue_push(vu_dev, vq, elem, 0);
vu_queue_notify(vu_dev, vq);
free(elem);
}
}
static void vus_queue_set_started(VuDev *vu_dev, int idx, bool started)
{
VuVirtq *vq;
assert(vu_dev);
if ((idx < 0) || (idx >= VHOST_MAX_NR_VIRTQUEUE)) {
PERR("VQ Index out of range: %d", idx);
vus_panic_cb(vu_dev, NULL);
return;
}
vq = vu_get_queue(vu_dev, idx);
switch (idx) {
case 0:
vu_set_queue_handler(vu_dev, vq, started ? vus_proc_ctl : NULL);
break;
case 1:
vu_set_queue_handler(vu_dev, vq, started ? vus_proc_evt : NULL);
break;
default:
vu_set_queue_handler(vu_dev, vq, started ? vus_proc_req : NULL);
}
}
static const VuDevIface vus_iface = {
.queue_set_started = vus_queue_set_started,
};
static gboolean vus_vhost_cb(gpointer data)
{
VuDev *vu_dev = (VuDev *)data;
assert(vu_dev);
if (!vu_dispatch(vu_dev) != 0) {
PERR("Error processing vhost message");
vus_panic_cb(vu_dev, NULL);
return G_SOURCE_REMOVE;
}
return G_SOURCE_CONTINUE;
}
/** misc helpers **/
static int unix_sock_new(char *unix_fn)
{
int sock;
struct sockaddr_un un;
size_t len;
assert(unix_fn);
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock <= 0) {
perror("socket");
return -1;
}
un.sun_family = AF_UNIX;
(void)snprintf(un.sun_path, sizeof(un.sun_path), "%s", unix_fn);
len = sizeof(un.sun_family) + strlen(un.sun_path);
(void)unlink(unix_fn);
if (bind(sock, (struct sockaddr *)&un, len) < 0) {
perror("bind");
goto fail;
}
if (listen(sock, 1) < 0) {
perror("listen");
goto fail;
}
return sock;
fail:
(void)close(sock);
return -1;
}
/** vhost-user-scsi **/
static vhost_scsi_dev_t *vdev_scsi_find_by_vu(VuDev *vu_dev)
{
int i;
assert(vu_dev);
for (i = 0; i < VUS_MAX_DEVS; i++) {
if (&vhost_scsi_devs[i]->vu_dev == vu_dev) {
return vhost_scsi_devs[i];
}
}
PERR("Unknown VuDev %p", vu_dev);
return NULL;
}
static void vdev_scsi_deinit(vhost_scsi_dev_t *vdev_scsi)
{
if (!vdev_scsi) {
return;
}
if (vdev_scsi->server_sock >= 0) {
struct sockaddr_storage ss;
socklen_t sslen = sizeof(ss);
if (getsockname(vdev_scsi->server_sock, (struct sockaddr *)&ss,
&sslen) == 0) {
struct sockaddr_un *su = (struct sockaddr_un *)&ss;
(void)unlink(su->sun_path);
}
(void)close(vdev_scsi->server_sock);
vdev_scsi->server_sock = -1;
}
if (vdev_scsi->loop) {
g_main_loop_unref(vdev_scsi->loop);
vdev_scsi->loop = NULL;
}
}
static vhost_scsi_dev_t *vdev_scsi_new(char *unix_fn)
{
vhost_scsi_dev_t *vdev_scsi = NULL;
assert(unix_fn);
vdev_scsi = calloc(1, sizeof(vhost_scsi_dev_t));
if (!vdev_scsi) {
PERR("calloc: %s", strerror(errno));
return NULL;
}
vdev_scsi->server_sock = unix_sock_new(unix_fn);
if (vdev_scsi->server_sock < 0) {
goto err;
}
vdev_scsi->loop = g_main_loop_new(NULL, FALSE);
if (!vdev_scsi->loop) {
PERR("Error creating glib event loop");
goto err;
}
vdev_scsi->fdmap = g_tree_new(vus_fdmap_compare);
if (!vdev_scsi->fdmap) {
PERR("Error creating glib tree for fdmap");
goto err;
}
return vdev_scsi;
err:
vdev_scsi_deinit(vdev_scsi);
free(vdev_scsi);
return NULL;
}
static int vdev_scsi_add_iscsi_lun(vhost_scsi_dev_t *vdev_scsi,
char *iscsi_uri, uint32_t lun) {
assert(vdev_scsi);
assert(iscsi_uri);
assert(lun < VUS_MAX_LUNS);
if (vdev_scsi->luns[lun].iscsi_ctx) {
PERR("Lun %d already configured", lun);
return -1;
}
if (iscsi_add_lun(&vdev_scsi->luns[lun], iscsi_uri) != 0) {
return -1;
}
return 0;
}
static int vdev_scsi_run(vhost_scsi_dev_t *vdev_scsi)
{
int cli_sock;
int ret = 0;
assert(vdev_scsi);
assert(vdev_scsi->server_sock >= 0);
assert(vdev_scsi->loop);
cli_sock = accept(vdev_scsi->server_sock, (void *)0, (void *)0);
if (cli_sock < 0) {
perror("accept");
return -1;
}
vu_init(&vdev_scsi->vu_dev,
cli_sock,
vus_panic_cb,
vus_add_watch_cb,
vus_del_watch_cb,
&vus_iface);
if (vus_gsrc_new(vdev_scsi, cli_sock, G_IO_IN, NULL, vus_vhost_cb,
&vdev_scsi->vu_dev)) {
goto fail;
}
g_main_loop_run(vdev_scsi->loop);
out:
vu_deinit(&vdev_scsi->vu_dev);
return ret;
fail:
ret = -1;
goto out;
}
int main(int argc, char **argv)
{
vhost_scsi_dev_t *vdev_scsi = NULL;
char *unix_fn = NULL;
char *iscsi_uri = NULL;
int opt, err = EXIT_SUCCESS;
while ((opt = getopt(argc, argv, "u:i:")) != -1) {
switch (opt) {
case 'h':
goto help;
case 'u':
unix_fn = strdup(optarg);
break;
case 'i':
iscsi_uri = strdup(optarg);
break;
default:
goto help;
}
}
if (!unix_fn || !iscsi_uri) {
goto help;
}
vdev_scsi = vdev_scsi_new(unix_fn);
if (!vdev_scsi) {
goto err;
}
vhost_scsi_devs[0] = vdev_scsi;
if (vdev_scsi_add_iscsi_lun(vdev_scsi, iscsi_uri, 0) != 0) {
goto err;
}
if (vdev_scsi_run(vdev_scsi) != 0) {
goto err;
}
out:
if (vdev_scsi) {
vdev_scsi_deinit(vdev_scsi);
free(vdev_scsi);
}
if (unix_fn) {
free(unix_fn);
}
if (iscsi_uri) {
free(iscsi_uri);
}
return err;
err:
err = EXIT_FAILURE;
goto out;
help:
fprintf(stderr, "Usage: %s [ -u unix_sock_path -i iscsi_uri ] | [ -h ]\n",
argv[0]);
fprintf(stderr, " -u path to unix socket\n");
fprintf(stderr, " -i iscsi uri for lun 0\n");
fprintf(stderr, " -h print help and quit\n");
goto err;
}
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