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guasi.c

/*
 * guasi engine
 *
 * IO engine using the GUASI library.
 *
 * This is currently disabled. To enable it, execute:
 *
 * $ export EXTFLAGS="-DFIO_HAVE_GUASI"
 * $ export EXTLIBS="-lguasi"
 *
 * before running make. You'll need the GUASI lib as well:
 *
 * http://www.xmailserver.org/guasi-lib.html
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>

#include "../fio.h"

#ifdef FIO_HAVE_GUASI

#define GFIO_MIN_THREADS 32
#ifndef GFIO_MAX_THREADS
#define GFIO_MAX_THREADS 2000
#endif

#include <guasi.h>
#include <guasi_syscalls.h>

#ifdef GFIO_DEBUG
#define GDBG_PRINT(a) printf a
#else
#define GDBG_PRINT(a) (void) 0
#endif

struct guasi_data {
      guasi_t hctx;
      int max_reqs;
      guasi_req_t *reqs;
      struct io_u **io_us;
      int queued_nr;
      int reqs_nr;
};

static int fio_guasi_prep(struct thread_data fio_unused *td, struct io_u *io_u)
{

      GDBG_PRINT(("fio_guasi_prep(%p)\n", io_u));
      io_u->greq = NULL;

      return 0;
}

static struct io_u *fio_guasi_event(struct thread_data *td, int event)
{
      struct guasi_data *ld = td->io_ops->data;
      struct io_u *io_u;
      struct guasi_reqinfo rinf;

      GDBG_PRINT(("fio_guasi_event(%d)\n", event));
      if (guasi_req_info(ld->reqs[event], &rinf) < 0) {
            log_err("guasi_req_info(%d) FAILED!\n", event);
            return NULL;
      }
      io_u = rinf.asid;
      io_u->error = EINPROGRESS;
      GDBG_PRINT(("fio_guasi_event(%d) -> %p\n", event, io_u));
      if (rinf.status == GUASI_STATUS_COMPLETE) {
            io_u->error = rinf.result;
            if (io_u->ddir == DDIR_READ ||
                io_u->ddir == DDIR_WRITE) {
                  io_u->error = 0;
                  if (rinf.result != (long) io_u->xfer_buflen) {
                        if (rinf.result >= 0)
                              io_u->resid = io_u->xfer_buflen - rinf.result;
                        else
                              io_u->error = rinf.error;
                  }
            }
      }

      return io_u;
}

static int fio_guasi_getevents(struct thread_data *td, unsigned int min,
                         unsigned int max, struct timespec *t)
{
      struct guasi_data *ld = td->io_ops->data;
      int n, r;
      long timeo = -1;

      GDBG_PRINT(("fio_guasi_getevents(%d, %d)\n", min, max));
      if (min > ld->max_reqs)
            min = ld->max_reqs;
      if (max > ld->max_reqs)
            max = ld->max_reqs;
      if (t)
            timeo = t->tv_sec * 1000L + t->tv_nsec / 1000000L;
      for (n = 0; n < ld->reqs_nr; n++)
            guasi_req_free(ld->reqs[n]);
      n = 0;
      do {
            r = guasi_fetch(ld->hctx, ld->reqs + n, min - n,
                        max - n, timeo);
            if (r < 0) {
                  log_err("guasi_fetch() FAILED! (%d)\n", r);
                  break;
            }
            n += r;
            if (n >= min)
                  break;
      } while (1);
      ld->reqs_nr = n;
      GDBG_PRINT(("fio_guasi_getevents() -> %d\n", n));

      return n;
}

static int fio_guasi_queue(struct thread_data *td, struct io_u *io_u)
{
      struct guasi_data *ld = td->io_ops->data;

      fio_ro_check(td, io_u);

      GDBG_PRINT(("fio_guasi_queue(%p)\n", io_u));
      if (ld->queued_nr == (int) td->o.iodepth)
            return FIO_Q_BUSY;

      ld->io_us[ld->queued_nr] = io_u;
      ld->queued_nr++;
      return FIO_Q_QUEUED;
}

static void fio_guasi_queued(struct thread_data *td, struct io_u **io_us, int nr)
{
      int i;
      struct io_u *io_u;
      struct timeval now;

      if (!fio_fill_issue_time(td))
            return;

      io_u_mark_submit(td, nr);
      fio_gettime(&now, NULL);
      for (i = 0; i < nr; i++) {
            io_u = io_us[i];
            memcpy(&io_u->issue_time, &now, sizeof(now));
            io_u_queued(td, io_u);
      }
}

static int fio_guasi_commit(struct thread_data *td)
{
      struct guasi_data *ld = td->io_ops->data;
      int i;
      struct io_u *io_u;
      struct fio_file *f;

      GDBG_PRINT(("fio_guasi_commit(%d)\n", ld->queued_nr));
      for (i = 0; i < ld->queued_nr; i++) {
            io_u = ld->io_us[i];
            GDBG_PRINT(("fio_guasi_commit(%d) --> %p\n", i, io_u));
            f = io_u->file;
            io_u->greq = NULL;
            if (io_u->ddir == DDIR_READ)
                  io_u->greq = guasi__pread(ld->hctx, ld, io_u, 0,
                                      f->fd, io_u->xfer_buf, io_u->xfer_buflen,
                                      io_u->offset);
            else if (io_u->ddir == DDIR_WRITE)
                  io_u->greq = guasi__pwrite(ld->hctx, ld, io_u, 0,
                                       f->fd, io_u->xfer_buf, io_u->xfer_buflen,
                                       io_u->offset);
            else if (ddir_sync(io_u->ddir))
                  io_u->greq = guasi__fsync(ld->hctx, ld, io_u, 0, f->fd);
            else {
                  log_err("fio_guasi_commit() FAILED: unknow request %d\n",
                        io_u->ddir);
            }
            if (io_u->greq == NULL) {
                  log_err("fio_guasi_commit() FAILED: submit failed (%s)\n",
                        strerror(errno));
                  return -1;
            }
      }
      fio_guasi_queued(td, ld->io_us, i);
      ld->queued_nr = 0;
      GDBG_PRINT(("fio_guasi_commit() -> %d\n", i));

      return 0;
}

static int fio_guasi_cancel(struct thread_data fio_unused *td,
                      struct io_u *io_u)
{
      GDBG_PRINT(("fio_guasi_cancel(%p) req=%p\n", io_u, io_u->greq));
      if (io_u->greq != NULL)
            guasi_req_cancel(io_u->greq);

      return 0;
}

static void fio_guasi_cleanup(struct thread_data *td)
{
      struct guasi_data *ld = td->io_ops->data;
      int n;

      GDBG_PRINT(("fio_guasi_cleanup(%p)\n", ld));
      if (ld) {
            for (n = 0; n < ld->reqs_nr; n++)
                  guasi_req_free(ld->reqs[n]);
            guasi_free(ld->hctx);
            free(ld->reqs);
            free(ld->io_us);
            free(ld);
      }
      GDBG_PRINT(("fio_guasi_cleanup(%p) DONE\n", ld));
}

static int fio_guasi_init(struct thread_data *td)
{
      int maxthr;
      struct guasi_data *ld = malloc(sizeof(*ld));

      GDBG_PRINT(("fio_guasi_init(): depth=%d\n", td->o.iodepth));
      memset(ld, 0, sizeof(*ld));
      maxthr = td->o.iodepth > GFIO_MIN_THREADS ? td->o.iodepth: GFIO_MIN_THREADS;
      if (maxthr > GFIO_MAX_THREADS)
            maxthr = GFIO_MAX_THREADS;
      if ((ld->hctx = guasi_create(GFIO_MIN_THREADS, maxthr, 1)) == NULL) {
            td_verror(td, errno, "guasi_create");
            free(ld);
            return 1;
      }
      ld->max_reqs = td->o.iodepth;
      ld->reqs = malloc(ld->max_reqs * sizeof(guasi_req_t));
      ld->io_us = malloc(ld->max_reqs * sizeof(struct io_u *));
      memset(ld->io_us, 0, ld->max_reqs * sizeof(struct io_u *));
      ld->queued_nr = 0;
      ld->reqs_nr = 0;

      td->io_ops->data = ld;
      GDBG_PRINT(("fio_guasi_init(): depth=%d -> %p\n", td->o.iodepth, ld));

      return 0;
}

static struct ioengine_ops ioengine = {
      .name       = "guasi",
      .version    = FIO_IOOPS_VERSION,
      .init       = fio_guasi_init,
      .prep       = fio_guasi_prep,
      .queue            = fio_guasi_queue,
      .commit           = fio_guasi_commit,
      .cancel           = fio_guasi_cancel,
      .getevents  = fio_guasi_getevents,
      .event            = fio_guasi_event,
      .cleanup    = fio_guasi_cleanup,
      .open_file  = generic_open_file,
      .close_file = generic_close_file,
      .get_file_size    = generic_get_file_size,
};

#else /* FIO_HAVE_GUASI */

/*
 * When we have a proper configure system in place, we simply wont build
 * and install this io engine. For now install a crippled version that
 * just complains and fails to load.
 */
static int fio_guasi_init(struct thread_data fio_unused *td)
{
      fprintf(stderr, "fio: guasi not available\n");
      return 1;
}

static struct ioengine_ops ioengine = {
      .name       = "guasi",
      .version    = FIO_IOOPS_VERSION,
      .init       = fio_guasi_init,
};

#endif

static void fio_init fio_guasi_register(void)
{
      register_ioengine(&ioengine);
}

static void fio_exit fio_guasi_unregister(void)
{
      unregister_ioengine(&ioengine);
}


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