[SCSI] add support for variable length extended commands

[safe/jmp/linux-2.6] / include / scsi / scsi.h

diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 5c0e979..32742c4 100644 (file)
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -11,18 +11,23 @@
 #include <linux/types.h>
 
 /*
- *     The maximum sg list length SCSI can cope with
- *     (currently must be a power of 2 between 32 and 256)
+ * The maximum number of SG segments that we will put inside a
+ * scatterlist (unless chaining is used). Should ideally fit inside a
+ * single page, to avoid a higher order allocation.  We could define this
+ * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order.  The
+ * minimum value is 32
  */
-#define SCSI_MAX_PHYS_SEGMENTS MAX_PHYS_SEGMENTS
-
+#define SCSI_MAX_SG_SEGMENTS   128
 
 /*
- *     SCSI command lengths
+ * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
+ * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
  */
-
-extern const unsigned char scsi_command_size[8];
-#define COMMAND_SIZE(opcode) scsi_command_size[((opcode) >> 5) & 7]
+#ifdef ARCH_HAS_SG_CHAIN
+#define SCSI_MAX_SG_CHAIN_SEGMENTS     2048
+#else
+#define SCSI_MAX_SG_CHAIN_SEGMENTS     SCSI_MAX_SG_SEGMENTS
+#endif
 
 /*
  * Special value for scanning to specify scanning or rescanning of all
@@ -90,12 +95,14 @@ extern const unsigned char scsi_command_size[8];
 #define READ_TOC              0x43
 #define LOG_SELECT            0x4c
 #define LOG_SENSE             0x4d
+#define XDWRITEREAD_10        0x53
 #define MODE_SELECT_10        0x55
 #define RESERVE_10            0x56
 #define RELEASE_10            0x57
 #define MODE_SENSE_10         0x5a
 #define PERSISTENT_RESERVE_IN 0x5e
 #define PERSISTENT_RESERVE_OUT 0x5f
+#define VARIABLE_LENGTH_CMD   0x7f
 #define REPORT_LUNS           0xa0
 #define MAINTENANCE_IN        0xa3
 #define MOVE_MEDIUM           0xa5
@@ -123,6 +130,38 @@ extern const unsigned char scsi_command_size[8];
 #define        ATA_12                0xa1      /* 12-byte pass-thru */
 
 /*
+ *     SCSI command lengths
+ */
+
+#define SCSI_MAX_VARLEN_CDB_SIZE 260
+
+/* defined in T10 SCSI Primary Commands-2 (SPC2) */
+struct scsi_varlen_cdb_hdr {
+       u8 opcode;        /* opcode always == VARIABLE_LENGTH_CMD */
+       u8 control;
+       u8 misc[5];
+       u8 additional_cdb_length;         /* total cdb length - 8 */
+       __be16 service_action;
+       /* service specific data follows */
+};
+
+static inline unsigned
+scsi_varlen_cdb_length(const void *hdr)
+{
+       return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
+}
+
+extern const unsigned char scsi_command_size_tbl[8];
+#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
+
+static inline unsigned
+scsi_command_size(const unsigned char *cmnd)
+{
+       return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
+               scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
+}
+
+/*
  *  SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
  *  T10/1561-D Revision 4 Draft dated 7th November 2002.
  */
@@ -203,6 +242,7 @@ static inline int scsi_status_is_good(int status)
 
 /*
  *  DEVICE TYPES
+ *  Please keep them in 0x%02x format for $MODALIAS to work
  */
 
 #define TYPE_DISK           0x00
@@ -221,6 +261,20 @@ static inline int scsi_status_is_good(int status)
 #define TYPE_RBC           0x0e
 #define TYPE_NO_LUN         0x7f
 
+/* SCSI protocols; these are taken from SPC-3 section 7.5 */
+enum scsi_protocol {
+       SCSI_PROTOCOL_FCP = 0,  /* Fibre Channel */
+       SCSI_PROTOCOL_SPI = 1,  /* parallel SCSI */
+       SCSI_PROTOCOL_SSA = 2,  /* Serial Storage Architecture - Obsolete */
+       SCSI_PROTOCOL_SBP = 3,  /* firewire */
+       SCSI_PROTOCOL_SRP = 4,  /* Infiniband RDMA */
+       SCSI_PROTOCOL_ISCSI = 5,
+       SCSI_PROTOCOL_SAS = 6,
+       SCSI_PROTOCOL_ADT = 7,  /* Media Changers */
+       SCSI_PROTOCOL_ATA = 8,
+       SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
+};
+
 /* Returns a human-readable name for the device */
 extern const char * scsi_device_type(unsigned type);