scsi: Rename scsi_*_length() to scsi_*_xfer(), add scsi_cdb_length()

scsi_cdb_length() does not return the length of the cdb, but
the transfersize encoded in the cdb. So rename it to scsi_cdb_xfer()
and also rename all other related functions to end with _xfer.

We can then add a new scsi_cdb_length() which actually does return the
length of the cdb.  With that DEBUG_SCSI can now display the correct
CDB buffer.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

3 files changed, 38 insertions, 30 deletions

diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index af7707cf27..6fce8471d4 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -826,7 +826,7 @@ static int ata_passthrough_xfer_unit(SCSIDevice *dev, uint8_t *buf)
     return xfer_unit;
 }
 
-static int ata_passthrough_12_xfer_size(SCSIDevice *dev, uint8_t *buf)
+static int ata_passthrough_12_xfer(SCSIDevice *dev, uint8_t *buf)
 {
     int length = buf[2] & 0x3;
     int xfer;
@@ -849,7 +849,7 @@ static int ata_passthrough_12_xfer_size(SCSIDevice *dev, uint8_t *buf)
     return xfer * unit;
 }
 
-static int ata_passthrough_16_xfer_size(SCSIDevice *dev, uint8_t *buf)
+static int ata_passthrough_16_xfer(SCSIDevice *dev, uint8_t *buf)
 {
     int extend = buf[1] & 0x1;
     int length = buf[2] & 0x3;
@@ -875,16 +875,16 @@ static int ata_passthrough_16_xfer_size(SCSIDevice *dev, uint8_t *buf)
     return xfer * unit;
 }
 
-uint32_t scsi_data_cdb_length(uint8_t *buf)
+uint32_t scsi_data_cdb_xfer(uint8_t *buf)
 {
     if ((buf[0] >> 5) == 0 && buf[4] == 0) {
         return 256;
     } else {
-        return scsi_cdb_length(buf);
+        return scsi_cdb_xfer(buf);
     }
 }
 
-uint32_t scsi_cdb_length(uint8_t *buf)
+uint32_t scsi_cdb_xfer(uint8_t *buf)
 {
     switch (buf[0] >> 5) {
     case 0:
@@ -905,9 +905,9 @@ uint32_t scsi_cdb_length(uint8_t *buf)
     }
 }
 
-static int scsi_req_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
+static int scsi_req_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
 {
-    cmd->xfer = scsi_cdb_length(buf);
+    cmd->xfer = scsi_cdb_xfer(buf);
     switch (buf[0]) {
     case TEST_UNIT_READY:
     case REWIND:
@@ -1038,17 +1038,17 @@ static int scsi_req_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
             /* BLANK command of MMC */
             cmd->xfer = 0;
         } else {
-            cmd->xfer = ata_passthrough_12_xfer_size(dev, buf);
+            cmd->xfer = ata_passthrough_12_xfer(dev, buf);
         }
         break;
     case ATA_PASSTHROUGH_16:
-        cmd->xfer = ata_passthrough_16_xfer_size(dev, buf);
+        cmd->xfer = ata_passthrough_16_xfer(dev, buf);
         break;
     }
     return 0;
 }
 
-static int scsi_req_stream_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
+static int scsi_req_stream_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
 {
     switch (buf[0]) {
     /* stream commands */
@@ -1103,12 +1103,12 @@ static int scsi_req_stream_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *bu
         break;
     /* generic commands */
     default:
-        return scsi_req_length(cmd, dev, buf);
+        return scsi_req_xfer(cmd, dev, buf);
     }
     return 0;
 }
 
-static int scsi_req_medium_changer_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
+static int scsi_req_medium_changer_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
 {
     switch (buf[0]) {
     /* medium changer commands */
@@ -1125,7 +1125,7 @@ static int scsi_req_medium_changer_length(SCSICommand *cmd, SCSIDevice *dev, uin
 
     /* generic commands */
     default:
-        return scsi_req_length(cmd, dev, buf);
+        return scsi_req_xfer(cmd, dev, buf);
     }
     return 0;
 }
@@ -1214,38 +1214,45 @@ static uint64_t scsi_cmd_lba(SCSICommand *cmd)
     return lba;
 }
 
-int scsi_req_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, uint8_t *buf)
-{
-    int rc;
+int scsi_cdb_length(uint8_t *buf) {
+    int cdb_len;
 
-    cmd->lba = -1;
     switch (buf[0] >> 5) {
     case 0:
-        cmd->len = 6;
+        cdb_len = 6;
         break;
     case 1:
     case 2:
-        cmd->len = 10;
+        cdb_len = 10;
         break;
     case 4:
-        cmd->len = 16;
+        cdb_len = 16;
         break;
     case 5:
-        cmd->len = 12;
+        cdb_len = 12;
         break;
     default:
-        return -1;
+        cdb_len = -1;
     }
+    return cdb_len;
+}
+
+int scsi_req_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, uint8_t *buf)
+{
+    int rc;
+
+    cmd->lba = -1;
+    cmd->len = scsi_cdb_length(buf);
 
     switch (dev->type) {
     case TYPE_TAPE:
-        rc = scsi_req_stream_length(cmd, dev, buf);
+        rc = scsi_req_stream_xfer(cmd, dev, buf);
         break;
     case TYPE_MEDIUM_CHANGER:
-        rc = scsi_req_medium_changer_length(cmd, dev, buf);
+        rc = scsi_req_medium_changer_xfer(cmd, dev, buf);
         break;
     default:
-        rc = scsi_req_length(cmd, dev, buf);
+        rc = scsi_req_xfer(cmd, dev, buf);
         break;
     }
 
diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index 010eefd443..7b58488b0e 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -1666,7 +1666,7 @@ static void scsi_disk_emulate_write_same(SCSIDiskReq *r, uint8_t *inbuf)
 {
     SCSIRequest *req = &r->req;
     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, req->dev);
-    uint32_t nb_sectors = scsi_data_cdb_length(r->req.cmd.buf);
+    uint32_t nb_sectors = scsi_data_cdb_xfer(r->req.cmd.buf);
     WriteSameCBData *data;
     uint8_t *buf;
     int i;
@@ -2061,7 +2061,7 @@ static int32_t scsi_disk_dma_command(SCSIRequest *req, uint8_t *buf)
         return 0;
     }
 
-    len = scsi_data_cdb_length(r->req.cmd.buf);
+    len = scsi_data_cdb_xfer(r->req.cmd.buf);
     switch (command) {
     case READ_6:
     case READ_10:
@@ -2396,7 +2396,7 @@ static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun,
     DPRINTF("Command: lun=%d tag=0x%x data=0x%02x", lun, tag, buf[0]);
     {
         int i;
-        for (i = 1; i < req->cmd.len; i++) {
+        for (i = 1; i < scsi_cdb_length(buf); i++) {
             printf(" 0x%02x", buf[i]);
         }
         printf("\n");
diff --git a/include/hw/scsi/scsi.h b/include/hw/scsi/scsi.h
index 6bc841ab8b..fd48177fa6 100644
--- a/include/hw/scsi/scsi.h
+++ b/include/hw/scsi/scsi.h
@@ -239,8 +239,9 @@ extern const struct SCSISense sense_code_SPACE_ALLOC_FAILED;
 
 #define SENSE_CODE(x) sense_code_ ## x
 
-uint32_t scsi_data_cdb_length(uint8_t *buf);
-uint32_t scsi_cdb_length(uint8_t *buf);
+uint32_t scsi_data_cdb_xfer(uint8_t *buf);
+uint32_t scsi_cdb_xfer(uint8_t *buf);
+int scsi_cdb_length(uint8_t *buf);
 int scsi_sense_valid(SCSISense sense);
 int scsi_build_sense(uint8_t *in_buf, int in_len,
                      uint8_t *buf, int len, bool fixed);