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scsi: allow zero-length read and write

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The SCSI spec says that zero transfer length shouldn't be considered an
error.

Change-Id: I98958cc393e0e487e25fdbb0eb7fc8126aff9945
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/374320
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Daniel Verkamp 2017-08-15 08:56:20 -07:00
parent 75a3ee3f66
commit 0720ad357b
2 changed files with 23 additions and 9 deletions
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14
lib/scsi/scsi_bdev.c
View File

@ -1338,15 +1338,6 @@ spdk_bdev_scsi_write(struct spdk_bdev *bdev,
int rc;
struct spdk_scsi_task *primary = task->parent;
if (len == 0) {
task->data_transferred = 0;
spdk_scsi_task_set_status(task, SPDK_SCSI_STATUS_CHECK_CONDITION,
SPDK_SCSI_SENSE_NO_SENSE,
SPDK_SCSI_ASC_NO_ADDITIONAL_SENSE,
SPDK_SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
return SPDK_SCSI_TASK_COMPLETE;
}
blen = spdk_bdev_get_block_size(bdev);
offset = lba * blen;
nbytes = ((uint64_t)len) * blen;
@ -1461,6 +1452,11 @@ spdk_bdev_scsi_readwrite(struct spdk_bdev *bdev,
return SPDK_SCSI_TASK_COMPLETE;
}
if (xfer_len == 0) {
task->status = SPDK_SCSI_STATUS_GOOD;
return SPDK_SCSI_TASK_COMPLETE;
}
/* Transfer Length is limited to the Block Limits VPD page Maximum Transfer Length */
max_xfer_len = SPDK_WORK_BLOCK_SIZE / spdk_bdev_get_block_size(bdev);
if (xfer_len > max_xfer_len) {

18
test/unit/lib/scsi/scsi_bdev.c/scsi_bdev_ut.c
View File

@ -672,6 +672,24 @@ xfer_len_test(void)
CU_ASSERT((task.sense_data[2] & 0xf) == SPDK_SCSI_SENSE_ILLEGAL_REQUEST);
CU_ASSERT(task.sense_data[12] == SPDK_SCSI_ASC_INVALID_FIELD_IN_CDB);
/* zero transfer length (valid) */
to_be64(&cdb[2], 0); /* LBA */
to_be32(&cdb[10], 0); /* transfer length */
task.transfer_len = 0;
rc = spdk_bdev_scsi_execute(&bdev, &task);
CU_ASSERT(rc == SPDK_SCSI_TASK_COMPLETE);
CU_ASSERT(task.status == SPDK_SCSI_STATUS_GOOD);
CU_ASSERT(task.data_transferred == 0);
/* zero transfer length past end of disk (invalid) */
to_be64(&cdb[2], g_test_bdev_num_blocks); /* LBA */
to_be32(&cdb[10], 0); /* transfer length */
task.transfer_len = 0;
rc = spdk_bdev_scsi_execute(&bdev, &task);
CU_ASSERT(rc == SPDK_SCSI_TASK_COMPLETE);
CU_ASSERT(task.status == SPDK_SCSI_STATUS_CHECK_CONDITION);
CU_ASSERT(task.sense_data[12] == SPDK_SCSI_ASC_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE);
spdk_put_task(&task);
}