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block/iscsi: Introducing new zero-copy API

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A new API to deploy zero-copy command submission. The new API takes I/O
vectors list and number of I/O vectors to submit as input parameters
when initiating the command. New API must be used if working with
iSER transport option.

Signed-off-by: Roy Shterman <roysh@mellanox.com>
Message-Id: <1476000896-18632-2-git-send-email-roysh@mellanox.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Roy Shterman 2016-10-09 11:14:55 +03:00 committed by Paolo Bonzini
parent e948f663e9
commit 583ec22e23
1 changed files with 40 additions and 2 deletions
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42
block/iscsi.c
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@ -202,6 +202,10 @@ static inline unsigned exp_random(double mean)
#define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00
#endif
#ifndef LIBISCSI_API_VERSION
#define LIBISCSI_API_VERSION 20130701
#endif
static int iscsi_translate_sense(struct scsi_sense *sense)
{
int ret;
@ -592,6 +596,20 @@ iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
iscsi_co_init_iscsitask(iscsilun, &iTask);
retry:
if (iscsilun->use_16_for_rw) {
#if LIBISCSI_API_VERSION >= (20160603)
iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
NULL, num_sectors * iscsilun->block_size,
iscsilun->block_size, 0, 0, fua, 0, 0,
iscsi_co_generic_cb, &iTask,
(struct scsi_iovec *)iov->iov, iov->niov);
} else {
iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
NULL, num_sectors * iscsilun->block_size,
iscsilun->block_size, 0, 0, fua, 0, 0,
iscsi_co_generic_cb, &iTask,
(struct scsi_iovec *)iov->iov, iov->niov);
}
#else
iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
NULL, num_sectors * iscsilun->block_size,
iscsilun->block_size, 0, 0, fua, 0, 0,
@ -602,11 +620,14 @@ retry:
iscsilun->block_size, 0, 0, fua, 0, 0,
iscsi_co_generic_cb, &iTask);
}
#endif
if (iTask.task == NULL) {
return -ENOMEM;
}
#if LIBISCSI_API_VERSION < (20160603)
scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
iov->niov);
#endif
while (!iTask.complete) {
iscsi_set_events(iscsilun);
qemu_coroutine_yield();
@ -789,6 +810,21 @@ static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
iscsi_co_init_iscsitask(iscsilun, &iTask);
retry:
if (iscsilun->use_16_for_rw) {
#if LIBISCSI_API_VERSION >= (20160603)
iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
num_sectors * iscsilun->block_size,
iscsilun->block_size, 0, 0, 0, 0, 0,
iscsi_co_generic_cb, &iTask,
(struct scsi_iovec *)iov->iov, iov->niov);
} else {
iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
num_sectors * iscsilun->block_size,
iscsilun->block_size,
0, 0, 0, 0, 0,
iscsi_co_generic_cb, &iTask,
(struct scsi_iovec *)iov->iov, iov->niov);
}
#else
iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
num_sectors * iscsilun->block_size,
iscsilun->block_size, 0, 0, 0, 0, 0,
@ -800,11 +836,13 @@ retry:
0, 0, 0, 0, 0,
iscsi_co_generic_cb, &iTask);
}
#endif
if (iTask.task == NULL) {
return -ENOMEM;
}
#if LIBISCSI_API_VERSION < (20160603)
scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
#endif
while (!iTask.complete) {
iscsi_set_events(iscsilun);
qemu_coroutine_yield();
@ -1649,7 +1687,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
/* timeout handling is broken in libiscsi before 1.15.0 */
timeout = parse_timeout(iscsi_url->target);
#if defined(LIBISCSI_API_VERSION) && LIBISCSI_API_VERSION >= 20150621
#if LIBISCSI_API_VERSION >= 20150621
iscsi_set_timeout(iscsi, timeout);
#else
if (timeout) {