X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Fscsi%2Fscsi_host.h;h=d123ca84e732bf711fb965c66db8017ad468ec6a;hb=83ff6fe8580a7c834dba4389d742332fff9b9929;hp=d967d6dc7a28d7de7d58eb40b4a2258c4187c2a8;hpb=ee959b00c335d7780136c5abda37809191fe52c3;p=safe%2Fjmp%2Flinux-2.6

diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index d967d6d..d123ca8 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -43,13 +43,6 @@ struct blk_queue_tags;
 #define DISABLE_CLUSTERING 0
 #define ENABLE_CLUSTERING 1
 
-enum scsi_eh_timer_return {
-	EH_NOT_HANDLED,
-	EH_HANDLED,
-	EH_RESET_TIMER,
-};
-
-
 struct scsi_host_template {
 	struct module *module;
 	const char *name;
@@ -347,7 +340,7 @@ struct scsi_host_template {
 	 *
 	 * Status: OPTIONAL
 	 */
-	enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
+	enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
 
 	/*
 	 * Name of proc directory
@@ -547,7 +540,7 @@ struct Scsi_Host {
 	unsigned int host_failed;	   /* commands that failed. */
 	unsigned int host_eh_scheduled;    /* EH scheduled without command */
     
-	unsigned short host_no;  /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */
+	unsigned int host_no;  /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */
 	int resetting; /* if set, it means that last_reset is a valid value */
 	unsigned long last_reset;
 
@@ -573,13 +566,11 @@ struct Scsi_Host {
 	/*
 	 * The maximum length of SCSI commands that this host can accept.
 	 * Probably 12 for most host adapters, but could be 16 for others.
+	 * or 260 if the driver supports variable length cdbs.
 	 * For drivers that don't set this field, a value of 12 is
-	 * assumed.  I am leaving this as a number rather than a bit
-	 * because you never know what subsequent SCSI standards might do
-	 * (i.e. could there be a 20 byte or a 24-byte command a few years
-	 * down the road?).  
+	 * assumed.
 	 */
-	unsigned char max_cmd_len;
+	unsigned short max_cmd_len;
 
 	int this_id;
 	int can_queue;
@@ -625,7 +616,7 @@ struct Scsi_Host {
 	/*
 	 * Optional work queue to be utilized by the transport
 	 */
-	char work_q_name[KOBJ_NAME_LEN];
+	char work_q_name[20];
 	struct workqueue_struct *work_q;
 
 	/*
@@ -638,6 +629,10 @@ struct Scsi_Host {
 	 */
 	unsigned int max_host_blocked;
 
+	/* Protection Information */
+	unsigned int prot_capabilities;
+	unsigned char prot_guard_type;
+
 	/*
 	 * q used for scsi_tgt msgs, async events or any other requests that
 	 * need to be processed in userspace
@@ -758,6 +753,86 @@ extern struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
 extern void scsi_free_host_dev(struct scsi_device *);
 extern struct scsi_device *scsi_get_host_dev(struct Scsi_Host *);
 
+/*
+ * DIF defines the exchange of protection information between
+ * initiator and SBC block device.
+ *
+ * DIX defines the exchange of protection information between OS and
+ * initiator.
+ */
+enum scsi_host_prot_capabilities {
+	SHOST_DIF_TYPE1_PROTECTION = 1 << 0, /* T10 DIF Type 1 */
+	SHOST_DIF_TYPE2_PROTECTION = 1 << 1, /* T10 DIF Type 2 */
+	SHOST_DIF_TYPE3_PROTECTION = 1 << 2, /* T10 DIF Type 3 */
+
+	SHOST_DIX_TYPE0_PROTECTION = 1 << 3, /* DIX between OS and HBA only */
+	SHOST_DIX_TYPE1_PROTECTION = 1 << 4, /* DIX with DIF Type 1 */
+	SHOST_DIX_TYPE2_PROTECTION = 1 << 5, /* DIX with DIF Type 2 */
+	SHOST_DIX_TYPE3_PROTECTION = 1 << 6, /* DIX with DIF Type 3 */
+};
+
+/*
+ * SCSI hosts which support the Data Integrity Extensions must
+ * indicate their capabilities by setting the prot_capabilities using
+ * this call.
+ */
+static inline void scsi_host_set_prot(struct Scsi_Host *shost, unsigned int mask)
+{
+	shost->prot_capabilities = mask;
+}
+
+static inline unsigned int scsi_host_get_prot(struct Scsi_Host *shost)
+{
+	return shost->prot_capabilities;
+}
+
+static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsigned int target_type)
+{
+	switch (target_type) {
+	case 1: return shost->prot_capabilities & SHOST_DIF_TYPE1_PROTECTION;
+	case 2: return shost->prot_capabilities & SHOST_DIF_TYPE2_PROTECTION;
+	case 3: return shost->prot_capabilities & SHOST_DIF_TYPE3_PROTECTION;
+	}
+
+	return 0;
+}
+
+static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsigned int target_type)
+{
+	switch (target_type) {
+	case 0: return shost->prot_capabilities & SHOST_DIX_TYPE0_PROTECTION;
+	case 1: return shost->prot_capabilities & SHOST_DIX_TYPE1_PROTECTION;
+	case 2: return shost->prot_capabilities & SHOST_DIX_TYPE2_PROTECTION;
+	case 3: return shost->prot_capabilities & SHOST_DIX_TYPE3_PROTECTION;
+	}
+
+	return 0;
+}
+
+/*
+ * All DIX-capable initiators must support the T10-mandated CRC
+ * checksum.  Controllers can optionally implement the IP checksum
+ * scheme which has much lower impact on system performance.  Note
+ * that the main rationale for the checksum is to match integrity
+ * metadata with data.  Detecting bit errors are a job for ECC memory
+ * and buses.
+ */
+
+enum scsi_host_guard_type {
+	SHOST_DIX_GUARD_CRC = 1 << 0,
+	SHOST_DIX_GUARD_IP  = 1 << 1,
+};
+
+static inline void scsi_host_set_guard(struct Scsi_Host *shost, unsigned char type)
+{
+	shost->prot_guard_type = type;
+}
+
+static inline unsigned char scsi_host_get_guard(struct Scsi_Host *shost)
+{
+	return shost->prot_guard_type;
+}
+
 /* legacy interfaces */
 extern struct Scsi_Host *scsi_register(struct scsi_host_template *, int);
 extern void scsi_unregister(struct Scsi_Host *);