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[scsi] Wait for a successful TEST UNIT READY command

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Some SCSI targets (observed with an EMC CLARiiON Fibre Channel target)
will not respond to commands correctly until a TEST UNIT READY has
been issued.  In particular, a READ CAPACITY (10) command will return
with a success status, but no capacity data.

Fix by issuing a TEST UNIT READY command automatically, and delaying
further SCSI commands until the TEST UNIT READY has succeeded.

Reported-by: Hadar Hen Zion <hadarh@mellanox.co.il>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2010-10-16 13:53:38 +01:00
parent b0e434280e
commit 57bab0ae4a
2 changed files with 144 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/include/ipxe/scsi.h
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@@ -28,6 +28,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#define SCSI_OPCODE_READ_CAPACITY_10 0x25 /**< READ CAPACITY (10) */
#define SCSI_OPCODE_SERVICE_ACTION_IN 0x9e /**< SERVICE ACTION IN */
#define SCSI_SERVICE_ACTION_READ_CAPACITY_16 0x10 /**< READ CAPACITY (16) */
#define SCSI_OPCODE_TEST_UNIT_READY 0x00 /**< TEST UNIT READY */
/** @} */
@@ -192,6 +193,16 @@ struct scsi_capacity_16 {
uint8_t reserved[20];
} __attribute__ (( packed ));
/** A SCSI "TEST UNIT READY" CDB */
struct scsi_cdb_test_unit_ready {
/** Opcode (0x00) */
uint8_t opcode;
/** Reserved */
uint8_t reserved[4];
/** Control byte */
uint8_t control;
} __attribute__ (( packed ));
/** A SCSI Command Data Block */
union scsi_cdb {
struct scsi_cdb_read_10 read10;
@@ -200,6 +211,7 @@ union scsi_cdb {
struct scsi_cdb_write_16 write16;
struct scsi_cdb_read_capacity_10 readcap10;
struct scsi_cdb_read_capacity_16 readcap16;
struct scsi_cdb_test_unit_ready testready;
unsigned char bytes[16];
};