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[SCSI] add support for variable length extended commands
Add support for variable-length, extended, and vendor specific CDBs to scsi-ml. It is now possible for initiators and ULD's to issue these types of commands. LLDs need not change much. All they need is to raise the .max_cmd_len to the longest command they support (see iscsi patch). - clean-up some code paths that did not expect commands to be larger than 16, and change cmd_len members' type to short as char is not enough. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Boaz Harrosh
James Bottomley
parent
64a87b244b
commit
db4742dd8f
7 changed files with 47 additions and 35 deletions
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@ -33,13 +33,12 @@
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#include <scsi/scsi_cmnd.h>
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/* Command group 3 is reserved and should never be used. */
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const unsigned char scsi_command_size[8] =
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const unsigned char scsi_command_size_tbl[8] =
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{
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6, 10, 10, 12,
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16, 12, 10, 10
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};
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EXPORT_SYMBOL(scsi_command_size);
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EXPORT_SYMBOL(scsi_command_size_tbl);
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#include <scsi/sg.h>
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@ -28,7 +28,6 @@
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#define SERVICE_ACTION_OUT_12 0xa9
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#define SERVICE_ACTION_IN_16 0x9e
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#define SERVICE_ACTION_OUT_16 0x9f
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#define VARIABLE_LENGTH_CMD 0x7f
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@ -210,7 +209,7 @@ static void print_opcode_name(unsigned char * cdbp, int cdb_len)
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cdb0 = cdbp[0];
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switch(cdb0) {
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case VARIABLE_LENGTH_CMD:
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len = cdbp[7] + 8;
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len = scsi_varlen_cdb_length(cdbp);
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if (len < 10) {
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printk("short variable length command, "
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"len=%d ext_len=%d", len, cdb_len);
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@ -300,7 +299,7 @@ static void print_opcode_name(unsigned char * cdbp, int cdb_len)
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cdb0 = cdbp[0];
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switch(cdb0) {
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case VARIABLE_LENGTH_CMD:
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len = cdbp[7] + 8;
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len = scsi_varlen_cdb_length(cdbp);
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if (len < 10) {
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printk("short opcode=0x%x command, len=%d "
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"ext_len=%d", cdb0, len, cdb_len);
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@ -335,10 +334,7 @@ void __scsi_print_command(unsigned char *cdb)
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int k, len;
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print_opcode_name(cdb, 0);
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if (VARIABLE_LENGTH_CMD == cdb[0])
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len = cdb[7] + 8;
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else
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len = COMMAND_SIZE(cdb[0]);
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len = scsi_command_size(cdb);
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/* print out all bytes in cdb */
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for (k = 0; k < len; ++k)
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printk(" %02x", cdb[k]);
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@ -78,15 +78,6 @@ static void scsi_done(struct scsi_cmnd *cmd);
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/* Do not call reset on error if we just did a reset within 15 sec. */
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#define MIN_RESET_PERIOD (15*HZ)
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/*
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* Macro to determine the size of SCSI command. This macro takes vendor
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* unique commands into account. SCSI commands in groups 6 and 7 are
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* vendor unique and we will depend upon the command length being
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* supplied correctly in cmd_len.
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*/
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#define CDB_SIZE(cmd) (((((cmd)->cmnd[0] >> 5) & 7) < 6) ? \
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COMMAND_SIZE((cmd)->cmnd[0]) : (cmd)->cmd_len)
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/*
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* Note - the initial logging level can be set here to log events at boot time.
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* After the system is up, you may enable logging via the /proc interface.
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@ -709,9 +700,11 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
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* Before we queue this command, check if the command
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* length exceeds what the host adapter can handle.
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*/
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if (CDB_SIZE(cmd) > cmd->device->host->max_cmd_len) {
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if (cmd->cmd_len > cmd->device->host->max_cmd_len) {
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SCSI_LOG_MLQUEUE(3,
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printk("queuecommand : command too long.\n"));
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printk("queuecommand : command too long. "
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"cdb_size=%d host->max_cmd_len=%d\n",
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cmd->cmd_len, cmd->device->host->max_cmd_len));
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cmd->result = (DID_ABORT << 16);
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scsi_done(cmd);
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@ -445,7 +445,7 @@ static void scsi_init_cmd_errh(struct scsi_cmnd *cmd)
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scsi_set_resid(cmd, 0);
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memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
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if (cmd->cmd_len == 0)
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cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
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cmd->cmd_len = scsi_command_size(cmd->cmnd);
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}
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void scsi_device_unbusy(struct scsi_device *sdev)
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@ -29,13 +29,6 @@
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#define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
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#endif
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/*
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* SCSI command lengths
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*/
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extern const unsigned char scsi_command_size[8];
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#define COMMAND_SIZE(opcode) scsi_command_size[((opcode) >> 5) & 7]
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/*
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* Special value for scanning to specify scanning or rescanning of all
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* possible channels, (target) ids, or luns on a given shost.
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@ -109,6 +102,7 @@ extern const unsigned char scsi_command_size[8];
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#define MODE_SENSE_10 0x5a
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#define PERSISTENT_RESERVE_IN 0x5e
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#define PERSISTENT_RESERVE_OUT 0x5f
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#define VARIABLE_LENGTH_CMD 0x7f
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#define REPORT_LUNS 0xa0
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#define MAINTENANCE_IN 0xa3
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#define MOVE_MEDIUM 0xa5
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@ -135,6 +129,38 @@ extern const unsigned char scsi_command_size[8];
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#define ATA_16 0x85 /* 16-byte pass-thru */
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#define ATA_12 0xa1 /* 12-byte pass-thru */
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/*
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* SCSI command lengths
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*/
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#define SCSI_MAX_VARLEN_CDB_SIZE 260
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/* defined in T10 SCSI Primary Commands-2 (SPC2) */
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struct scsi_varlen_cdb_hdr {
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u8 opcode; /* opcode always == VARIABLE_LENGTH_CMD */
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u8 control;
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u8 misc[5];
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u8 additional_cdb_length; /* total cdb length - 8 */
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__be16 service_action;
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/* service specific data follows */
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};
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static inline unsigned
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scsi_varlen_cdb_length(const void *hdr)
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{
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return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
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}
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extern const unsigned char scsi_command_size_tbl[8];
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#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
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static inline unsigned
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scsi_command_size(const unsigned char *cmnd)
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{
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return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
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scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
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}
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/*
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* SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
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* T10/1561-D Revision 4 Draft dated 7th November 2002.
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@ -78,7 +78,7 @@ struct scsi_cmnd {
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int allowed;
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int timeout_per_command;
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unsigned char cmd_len;
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unsigned short cmd_len;
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enum dma_data_direction sc_data_direction;
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/* These elements define the operation we are about to perform */
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@ -573,13 +573,11 @@ struct Scsi_Host {
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/*
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* The maximum length of SCSI commands that this host can accept.
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* Probably 12 for most host adapters, but could be 16 for others.
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* or 260 if the driver supports variable length cdbs.
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* For drivers that don't set this field, a value of 12 is
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* assumed. I am leaving this as a number rather than a bit
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* because you never know what subsequent SCSI standards might do
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* (i.e. could there be a 20 byte or a 24-byte command a few years
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* down the road?).
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* assumed.
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*/
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unsigned char max_cmd_len;
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unsigned short max_cmd_len;
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int this_id;
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int can_queue;
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