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| author | Roy Shterman <roysh@mellanox.com> | 2016-10-09 11:14:55 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-10-24 11:30:55 +0200 |
| commit | 583ec22e2385fda19e2207cab1b688b816d95de0 (patch) | |
| tree | 3e8bea992e94fd4478d6a1bcd2abc62c914565ac /block | |
| parent | e948f663e9334249c394b88926addcdd3f9e35cd (diff) | |
| download | qemu-583ec22e2385fda19e2207cab1b688b816d95de0.tar.gz qemu-583ec22e2385fda19e2207cab1b688b816d95de0.tar.bz2 qemu-583ec22e2385fda19e2207cab1b688b816d95de0.zip | |
block/iscsi: Introducing new zero-copy API
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/iscsi.c | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/block/iscsi.c b/block/iscsi.c index 46ddc355ac..e9bf5db5c5 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -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) { |