[SCSI] libsas: implement > 16 byte CDB support

Remove the arbitrary expectation in libsas that all SCSI commands are 16 bytes
or less.  Instead do all copies via cmd->cmd_len (and use a pointer to this in
the libsas task instead of a copy).  Note that this still doesn't enable > 16
byte CDB support in the underlying drivers because their internal format has
to be fixed and the wire format of > 16 byte CDBs according to the SAS spec is
different.  the libsas drivers (isci, aic94xx, mvsas and pm8xxx are all
updated for this change.

Cc: Lukasz Dorau <lukasz.dorau@intel.com>
Cc: Maciej Patelczyk <maciej.patelczyk@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Jack Wang <xjtuwjp@gmail.com>
Cc: Lindar Liu <lindar_liu@usish.com>
Cc: Xiangliang Yu <yuxiangl@marvell.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

7 files changed, 21 insertions, 17 deletions

diff --git a/drivers/scsi/aic94xx/aic94xx_task.c b/drivers/scsi/aic94xx/aic94xx_task.c
index 393e7ce8e95a..59b86e260ce9 100644
--- a/drivers/scsi/aic94xx/aic94xx_task.c
+++ b/drivers/scsi/aic94xx/aic94xx_task.c
@@ -505,7 +505,8 @@ static int asd_build_ssp_ascb(struct asd_ascb *ascb, struct sas_task *task,
                 scb->ssp_task.ssp_cmd.efb_prio_attr |= EFB_MASK;
         scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_prio << 3);
         scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_attr & 7);
-        memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cdb, 16);
+        memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cmd->cmnd,
+               task->ssp_task.cmd->cmd_len);
 
         scb->ssp_task.sister_scb = cpu_to_le16(0xFFFF);
         scb->ssp_task.conn_handle = cpu_to_le16(
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index e3e3bcbd5a9f..7b082157eb79 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -184,8 +184,8 @@ static void sci_io_request_build_ssp_command_iu(struct isci_request *ireq)
         cmd_iu->task_attr = task->ssp_task.task_attr;
         cmd_iu->_r_c = 0;
 
-        sci_swab32_cpy(&cmd_iu->cdb, task->ssp_task.cdb,
-                       sizeof(task->ssp_task.cdb) / sizeof(u32));
+        sci_swab32_cpy(&cmd_iu->cdb, task->ssp_task.cmd->cmnd,
+                       task->ssp_task.cmd->cmd_len / sizeof(u32));
 }
 
 static void sci_task_request_build_ssp_task_iu(struct isci_request *ireq)
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 6e795a174a12..da3aee17faa5 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -167,7 +167,7 @@ static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
         int_to_scsilun(cmd->device->lun, &lun);
         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
-        memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
+        task->ssp_task.cmd = cmd;
 
         task->scatter = scsi_sglist(cmd);
         task->num_scatter = scsi_sg_count(cmd);
diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index c9e244984e30..f14665a6293d 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -686,7 +686,8 @@ static int mvs_task_prep_ssp(struct mvs_info *mvi,
         if (ssp_hdr->frame_type != SSP_TASK) {
                 buf_cmd[9] = fburst | task->ssp_task.task_attr |
                                 (task->ssp_task.task_prio << 3);
-                memcpy(buf_cmd + 12, &task->ssp_task.cdb, 16);
+                memcpy(buf_cmd + 12, task->ssp_task.cmd->cmnd,
+                       task->ssp_task.cmd->cmd_len);
         } else{
                 buf_cmd[10] = tmf->tmf;
                 switch (tmf->tmf) {
diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c
index 69dd49c05f1e..a58546f73f0d 100644
--- a/drivers/scsi/pm8001/pm8001_hwi.c
+++ b/drivers/scsi/pm8001/pm8001_hwi.c
@@ -4291,7 +4291,8 @@ static int pm8001_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha,
                 ssp_cmd.ssp_iu.efb_prio_attr |= 0x80;
         ssp_cmd.ssp_iu.efb_prio_attr |= (task->ssp_task.task_prio << 3);
         ssp_cmd.ssp_iu.efb_prio_attr |= (task->ssp_task.task_attr & 7);
-        memcpy(ssp_cmd.ssp_iu.cdb, task->ssp_task.cdb, 16);
+        memcpy(ssp_cmd.ssp_iu.cdb, task->ssp_task.cmd->cmnd,
+               task->ssp_task.cmd->cmd_len);
         circularQ = &pm8001_ha->inbnd_q_tbl[0];
 
         /* fill in PRD (scatter/gather) table, if any */
diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
index 302514d8157b..f6c65eeafb5d 100644
--- a/drivers/scsi/pm8001/pm80xx_hwi.c
+++ b/drivers/scsi/pm8001/pm80xx_hwi.c
@@ -3559,9 +3559,9 @@ err_out:
 
 static int check_enc_sas_cmd(struct sas_task *task)
 {
-        if ((task->ssp_task.cdb[0] == READ_10)
-                || (task->ssp_task.cdb[0] == WRITE_10)
-                || (task->ssp_task.cdb[0] == WRITE_VERIFY))
+        u8 cmd = task->ssp_task.cmd->cmnd[0];
+
+        if (cmd == READ_10 || cmd == WRITE_10 || cmd == WRITE_VERIFY)
                 return 1;
         else
                 return 0;
@@ -3624,7 +3624,8 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha,
                 ssp_cmd.ssp_iu.efb_prio_attr |= 0x80;
         ssp_cmd.ssp_iu.efb_prio_attr |= (task->ssp_task.task_prio << 3);
         ssp_cmd.ssp_iu.efb_prio_attr |= (task->ssp_task.task_attr & 7);
-        memcpy(ssp_cmd.ssp_iu.cdb, task->ssp_task.cdb, 16);
+        memcpy(ssp_cmd.ssp_iu.cdb, task->ssp_task.cmd->cmnd,
+                       task->ssp_task.cmd->cmd_len);
         circularQ = &pm8001_ha->inbnd_q_tbl[0];
 
         /* Check if encryption is set */
@@ -3632,7 +3633,7 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha,
                 !(pm8001_ha->encrypt_info.status) && check_enc_sas_cmd(task)) {
                 PM8001_IO_DBG(pm8001_ha, pm8001_printk(
                         "Encryption enabled.Sending Encrypt SAS command 0x%x\n",
-                        task->ssp_task.cdb[0]));
+                        task->ssp_task.cmd->cmnd[0]));
                 opc = OPC_INB_SSP_INI_DIF_ENC_IO;
                 /* enable encryption. 0 for SAS 1.1 and SAS 2.0 compatible TLR*/
                 ssp_cmd.dad_dir_m_tlr = cpu_to_le32
@@ -3666,14 +3667,14 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha,
                 /* XTS mode. All other fields are 0 */
                 ssp_cmd.key_cmode = 0x6 << 4;
                 /* set tweak values. Should be the start lba */
-                ssp_cmd.twk_val0 = cpu_to_le32((task->ssp_task.cdb[2] << 24) |
-                                                (task->ssp_task.cdb[3] << 16) |
-                                                (task->ssp_task.cdb[4] << 8) |
-                                                (task->ssp_task.cdb[5]));
+                ssp_cmd.twk_val0 = cpu_to_le32((task->ssp_task.cmd->cmnd[2] << 24) |
+                                                (task->ssp_task.cmd->cmnd[3] << 16) |
+                                                (task->ssp_task.cmd->cmnd[4] << 8) |
+                                                (task->ssp_task.cmd->cmnd[5]));
         } else {
                 PM8001_IO_DBG(pm8001_ha, pm8001_printk(
                         "Sending Normal SAS command 0x%x inb q %x\n",
-                        task->ssp_task.cdb[0], inb));
+                        task->ssp_task.cmd->cmnd[0], inb));
                 /* fill in PRD (scatter/gather) table, if any */
                 if (task->num_scatter > 1) {
                         pm8001_chip_make_sg(task->scatter, ccb->n_elem,
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index e2c1e66d58ae..f843dd8722a9 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -608,7 +608,7 @@ struct sas_ssp_task {
         u8     enable_first_burst:1;
         enum   task_attribute task_attr;
         u8     task_prio;
-        u8     cdb[16];
+        struct scsi_cmnd *cmd;
 };
 
 struct sas_task {