/*
* libiscsi engine
*
* this engine read/write iscsi lun with libiscsi.
*/
#include "../fio.h"
#include "../optgroup.h"
#include <stdlib.h>
#include <iscsi/iscsi.h>
#include <iscsi/scsi-lowlevel.h>
#include <poll.h>
struct iscsi_lun;
struct iscsi_info;
struct iscsi_task {
struct scsi_task *scsi_task;
struct iscsi_lun *iscsi_lun;
struct io_u *io_u;
};
struct iscsi_lun {
struct iscsi_info *iscsi_info;
struct iscsi_context *iscsi;
struct iscsi_url *url;
int block_size;
uint64_t num_blocks;
};
struct iscsi_info {
struct iscsi_lun **luns;
int nr_luns;
struct pollfd *pfds;
struct iscsi_task **complete_events;
int nr_events;
};
struct iscsi_options {
void *pad;
char *initiator;
};
static struct fio_option options[] = {
{
.name = "initiator",
.lname = "initiator",
.type = FIO_OPT_STR_STORE,
.off1 = offsetof(struct iscsi_options, initiator),
.def = "iqn.2019-04.org.fio:fio",
.help = "initiator name",
.category = FIO_OPT_C_ENGINE,
.group = FIO_OPT_G_ISCSI,
},
{
.name = NULL,
},
};
static int fio_iscsi_setup_lun(struct iscsi_info *iscsi_info,
char *initiator, struct fio_file *f, int i)
{
struct iscsi_lun *iscsi_lun = NULL;
struct scsi_task *task = NULL;
struct scsi_readcapacity16 *rc16 = NULL;
int ret = 0;
iscsi_lun = malloc(sizeof(struct iscsi_lun));
memset(iscsi_lun, 0, sizeof(struct iscsi_lun));
iscsi_lun->iscsi_info = iscsi_info;
iscsi_lun->url = iscsi_parse_full_url(NULL, f->file_name);
if (iscsi_lun->url == NULL) {
log_err("iscsi: failed to parse url: %s\n", f->file_name);
ret = EINVAL;
goto out;
}
iscsi_lun->iscsi = iscsi_create_context(initiator);
if (iscsi_lun->iscsi == NULL) {
log_err("iscsi: failed to create iscsi context.\n");
ret = 1;
goto out;
}
if (iscsi_set_targetname(iscsi_lun->iscsi, iscsi_lun->url->target)) {
log_err("iscsi: failed to set target name.\n");
ret = EINVAL;
goto out;
}
if (iscsi_set_session_type(iscsi_lun->iscsi, ISCSI_SESSION_NORMAL) != 0) {
log_err("iscsi: failed to set session type.\n");
ret = EINVAL;
goto out;
}
if (iscsi_set_header_digest(iscsi_lun->iscsi,
ISCSI_HEADER_DIGEST_NONE_CRC32C) != 0) {
log_err("iscsi: failed to set header digest.\n");
ret = EINVAL;
goto out;
}
if (iscsi_full_connect_sync(iscsi_lun->iscsi,
iscsi_lun->url->portal,
iscsi_lun->url->lun)) {
log_err("sicsi: failed to connect to LUN : %s\n",
iscsi_get_error(iscsi_lun->iscsi));
ret = EINVAL;
goto out;
}
task = iscsi_readcapacity16_sync(iscsi_lun->iscsi, iscsi_lun->url->lun);
if (task == NULL || task->status != SCSI_STATUS_GOOD) {
log_err("iscsi: failed to send readcapacity command: %s\n",
iscsi_get_error(iscsi_lun->iscsi));
ret = EINVAL;
goto out;
}
rc16 = scsi_datain_unmarshall(task);
if (rc16 == NULL) {
log_err("iscsi: failed to unmarshal readcapacity16 data.\n");
ret = EINVAL;
goto out;
}
iscsi_lun->block_size = rc16->block_length;
iscsi_lun->num_blocks = rc16->returned_lba + 1;
scsi_free_scsi_task(task);
task = NULL;
f->real_file_size = iscsi_lun->num_blocks * iscsi_lun->block_size;
f->engine_data = iscsi_lun;
iscsi_info->luns[i] = iscsi_lun;
iscsi_info->pfds[i].fd = iscsi_get_fd(iscsi_lun->iscsi);
out:
if (task) {
scsi_free_scsi_task(task);
}
if (ret && iscsi_lun) {
if (iscsi_lun->iscsi != NULL) {
if (iscsi_is_logged_in(iscsi_lun->iscsi)) {
iscsi_logout_sync(iscsi_lun->iscsi);
}
iscsi_destroy_context(iscsi_lun->iscsi);
}
free(iscsi_lun);
}
return ret;
}
static int fio_iscsi_setup(struct thread_data *td)
{
struct iscsi_options *options = td->eo;
struct iscsi_info *iscsi_info = NULL;
int ret = 0;
struct fio_file *f;
int i;
iscsi_info = malloc(sizeof(struct iscsi_info));
iscsi_info->nr_luns = td->o.nr_files;
iscsi_info->luns = calloc(iscsi_info->nr_luns, sizeof(struct iscsi_lun*));
iscsi_info->pfds = calloc(iscsi_info->nr_luns, sizeof(struct pollfd));
iscsi_info->nr_events = 0;
iscsi_info->complete_events = calloc(td->o.iodepth, sizeof(struct iscsi_task*));
td->io_ops_data = iscsi_info;
for_each_file(td, f, i) {
ret = fio_iscsi_setup_lun(iscsi_info, options->initiator, f, i);
if (ret < 0) break;
}
return ret;
}
static int fio_iscsi_init(struct thread_data *td) {
return 0;
}
static void fio_iscsi_cleanup_lun(struct iscsi_lun *iscsi_lun) {
if (iscsi_lun->iscsi != NULL) {
if (iscsi_is_logged_in(iscsi_lun->iscsi)) {
iscsi_logout_sync(iscsi_lun->iscsi);
}
iscsi_destroy_context(iscsi_lun->iscsi);
}
free(iscsi_lun);
}
static void fio_iscsi_cleanup(struct thread_data *td)
{
struct iscsi_info *iscsi_info = td->io_ops_data;
for (int i = 0; i < iscsi_info->nr_luns; i++) {
if (iscsi_info->luns[i]) {
fio_iscsi_cleanup_lun(iscsi_info->luns[i]);
iscsi_info->luns[i] = NULL;
}
}
free(iscsi_info->luns);
free(iscsi_info->pfds);
free(iscsi_info->complete_events);
free(iscsi_info);
}
static int fio_iscsi_prep(struct thread_data *td, struct io_u *io_u)
{
return 0;
}
static int fio_iscsi_open_file(struct thread_data *td, struct fio_file *f)
{
return 0;
}
static int fio_iscsi_close_file(struct thread_data *td, struct fio_file *f)
{
return 0;
}
static void iscsi_cb(struct iscsi_context *iscsi, int status,
void *command_data, void *private_data)
{
struct iscsi_task *iscsi_task = (struct iscsi_task*)private_data;
struct iscsi_lun *iscsi_lun = iscsi_task->iscsi_lun;
struct iscsi_info *iscsi_info = iscsi_lun->iscsi_info;
struct io_u *io_u = iscsi_task->io_u;
if (status == SCSI_STATUS_GOOD) {
io_u->error = 0;
} else {
log_err("iscsi: request failed with error %s.\n",
iscsi_get_error(iscsi_lun->iscsi));
io_u->error = 1;
io_u->resid = io_u->xfer_buflen;
}
iscsi_info->complete_events[iscsi_info->nr_events] = iscsi_task;
iscsi_info->nr_events++;
}
static enum fio_q_status fio_iscsi_queue(struct thread_data *td,
struct io_u *io_u)
{
struct iscsi_lun *iscsi_lun = io_u->file->engine_data;
struct scsi_task *scsi_task = NULL;
struct iscsi_task *iscsi_task = malloc(sizeof(struct iscsi_task));
int ret = -1;
if (io_u->ddir == DDIR_READ || io_u->ddir == DDIR_WRITE) {
if (io_u->offset % iscsi_lun->block_size != 0) {
log_err("iscsi: offset is not align to block size.\n");
ret = -1;
goto out;
}
if (io_u->xfer_buflen % iscsi_lun->block_size != 0) {
log_err("iscsi: buflen is not align to block size.\n");
ret = -1;
goto out;
}
}
if (io_u->ddir == DDIR_READ) {
scsi_task = scsi_cdb_read16(io_u->offset / iscsi_lun->block_size,
io_u->xfer_buflen,
iscsi_lun->block_size,
0, 0, 0, 0, 0);
ret = scsi_task_add_data_in_buffer(scsi_task, io_u->xfer_buflen,
io_u->xfer_buf);
if (ret < 0) {
log_err("iscsi: failed to add data in buffer.\n");
goto out;
}
} else if (io_u->ddir == DDIR_WRITE) {
scsi_task = scsi_cdb_write16(io_u->offset / iscsi_lun->block_size,
io_u->xfer_buflen,
iscsi_lun->block_size,
0, 0, 0, 0, 0);
ret = scsi_task_add_data_out_buffer(scsi_task, io_u->xfer_buflen,
io_u->xfer_buf);
if (ret < 0) {
log_err("iscsi: failed to add data out buffer.\n");
goto out;
}
} else if (ddir_sync(io_u->ddir)) {
scsi_task = scsi_cdb_synchronizecache16(
0, iscsi_lun->num_blocks * iscsi_lun->block_size, 0, 0);
} else {
log_err("iscsi: invalid I/O operation: %d\n", io_u->ddir);
ret = EINVAL;
goto out;
}
iscsi_task->scsi_task = scsi_task;
iscsi_task->iscsi_lun = iscsi_lun;
iscsi_task->io_u = io_u;
ret = iscsi_scsi_command_async(iscsi_lun->iscsi, iscsi_lun->url->lun,
scsi_task, iscsi_cb, NULL, iscsi_task);
if (ret < 0) {
log_err("iscsi: failed to send scsi command.\n");
goto out;
}
return FIO_Q_QUEUED;
out:
if (iscsi_task) {
free(iscsi_task);
}
if (scsi_task) {
scsi_free_scsi_task(scsi_task);
}
if (ret) {
io_u->error = ret;
}
return FIO_Q_COMPLETED;
}
static int fio_iscsi_getevents(struct thread_data *td, unsigned int min,
unsigned int max, const struct timespec *t)
{
struct iscsi_info *iscsi_info = td->io_ops_data;
int ret = 0;
iscsi_info->nr_events = 0;
while (iscsi_info->nr_events < min) {
for (int i = 0; i < iscsi_info->nr_luns; i++) {
int events = iscsi_which_events(iscsi_info->luns[i]->iscsi);
iscsi_info->pfds[i].events = events;
}
ret = poll(iscsi_info->pfds, iscsi_info->nr_luns, -1);
if (ret < 0) {
if (errno == EINTR || errno == EAGAIN) {
continue;
}
log_err("iscsi: failed to poll events: %s.\n",
strerror(errno));
break;
}
for (int i = 0; i < iscsi_info->nr_luns; i++) {
ret = iscsi_service(iscsi_info->luns[i]->iscsi,
iscsi_info->pfds[i].revents);
assert(ret >= 0);
}
}
return ret < 0 ? ret : iscsi_info->nr_events;
}
static struct io_u *fio_iscsi_event(struct thread_data *td, int event)
{
struct iscsi_info *iscsi_info = (struct iscsi_info*)td->io_ops_data;
struct iscsi_task *iscsi_task = iscsi_info->complete_events[event];
struct io_u *io_u = iscsi_task->io_u;
iscsi_info->complete_events[event] = NULL;
scsi_free_scsi_task(iscsi_task->scsi_task);
free(iscsi_task);
return io_u;
}
static struct ioengine_ops ioengine_iscsi = {
.name = "libiscsi",
.version = FIO_IOOPS_VERSION,
.flags = FIO_SYNCIO | FIO_DISKLESSIO | FIO_NODISKUTIL,
.setup = fio_iscsi_setup,
.init = fio_iscsi_init,
.prep = fio_iscsi_prep,
.queue = fio_iscsi_queue,
.getevents = fio_iscsi_getevents,
.event = fio_iscsi_event,
.cleanup = fio_iscsi_cleanup,
.open_file = fio_iscsi_open_file,
.close_file = fio_iscsi_close_file,
.option_struct_size = sizeof(struct iscsi_options),
.options = options,
};
static void fio_init fio_iscsi_register(void)
{
register_ioengine(&ioengine_iscsi);
}
static void fio_exit fio_iscsi_unregister(void)
{
unregister_ioengine(&ioengine_iscsi);
}