diff options
Diffstat (limited to 'libdde_linux26/contrib/include/scsi/scsi_host.h')
| -rw-r--r-- | libdde_linux26/contrib/include/scsi/scsi_host.h | 841 |
1 files changed, 0 insertions, 841 deletions
diff --git a/libdde_linux26/contrib/include/scsi/scsi_host.h b/libdde_linux26/contrib/include/scsi/scsi_host.h deleted file mode 100644 index d123ca84..00000000 --- a/libdde_linux26/contrib/include/scsi/scsi_host.h +++ /dev/null @@ -1,841 +0,0 @@ -#ifndef _SCSI_SCSI_HOST_H -#define _SCSI_SCSI_HOST_H - -#include <linux/device.h> -#include <linux/list.h> -#include <linux/types.h> -#include <linux/workqueue.h> -#include <linux/mutex.h> -#include <scsi/scsi.h> - -struct request_queue; -struct block_device; -struct completion; -struct module; -struct scsi_cmnd; -struct scsi_device; -struct scsi_target; -struct Scsi_Host; -struct scsi_host_cmd_pool; -struct scsi_transport_template; -struct blk_queue_tags; - - -/* - * The various choices mean: - * NONE: Self evident. Host adapter is not capable of scatter-gather. - * ALL: Means that the host adapter module can do scatter-gather, - * and that there is no limit to the size of the table to which - * we scatter/gather data. The value we set here is the maximum - * single element sglist. To use chained sglists, the adapter - * has to set a value beyond ALL (and correctly use the chain - * handling API. - * Anything else: Indicates the maximum number of chains that can be - * used in one scatter-gather request. - */ -#define SG_NONE 0 -#define SG_ALL SCSI_MAX_SG_SEGMENTS - -#define MODE_UNKNOWN 0x00 -#define MODE_INITIATOR 0x01 -#define MODE_TARGET 0x02 - -#define DISABLE_CLUSTERING 0 -#define ENABLE_CLUSTERING 1 - -struct scsi_host_template { - struct module *module; - const char *name; - - /* - * Used to initialize old-style drivers. For new-style drivers - * just perform all work in your module initialization function. - * - * Status: OBSOLETE - */ - int (* detect)(struct scsi_host_template *); - - /* - * Used as unload callback for hosts with old-style drivers. - * - * Status: OBSOLETE - */ - int (* release)(struct Scsi_Host *); - - /* - * The info function will return whatever useful information the - * developer sees fit. If not provided, then the name field will - * be used instead. - * - * Status: OPTIONAL - */ - const char *(* info)(struct Scsi_Host *); - - /* - * Ioctl interface - * - * Status: OPTIONAL - */ - int (* ioctl)(struct scsi_device *dev, int cmd, void __user *arg); - - -#ifdef CONFIG_COMPAT - /* - * Compat handler. Handle 32bit ABI. - * When unknown ioctl is passed return -ENOIOCTLCMD. - * - * Status: OPTIONAL - */ - int (* compat_ioctl)(struct scsi_device *dev, int cmd, void __user *arg); -#endif - - /* - * The queuecommand function is used to queue up a scsi - * command block to the LLDD. When the driver finished - * processing the command the done callback is invoked. - * - * If queuecommand returns 0, then the HBA has accepted the - * command. The done() function must be called on the command - * when the driver has finished with it. (you may call done on the - * command before queuecommand returns, but in this case you - * *must* return 0 from queuecommand). - * - * Queuecommand may also reject the command, in which case it may - * not touch the command and must not call done() for it. - * - * There are two possible rejection returns: - * - * SCSI_MLQUEUE_DEVICE_BUSY: Block this device temporarily, but - * allow commands to other devices serviced by this host. - * - * SCSI_MLQUEUE_HOST_BUSY: Block all devices served by this - * host temporarily. - * - * For compatibility, any other non-zero return is treated the - * same as SCSI_MLQUEUE_HOST_BUSY. - * - * NOTE: "temporarily" means either until the next command for# - * this device/host completes, or a period of time determined by - * I/O pressure in the system if there are no other outstanding - * commands. - * - * STATUS: REQUIRED - */ - int (* queuecommand)(struct scsi_cmnd *, - void (*done)(struct scsi_cmnd *)); - - /* - * The transfer functions are used to queue a scsi command to - * the LLD. When the driver is finished processing the command - * the done callback is invoked. - * - * This is called to inform the LLD to transfer - * scsi_bufflen(cmd) bytes. scsi_sg_count(cmd) speciefies the - * number of scatterlist entried in the command and - * scsi_sglist(cmd) returns the scatterlist. - * - * return values: see queuecommand - * - * If the LLD accepts the cmd, it should set the result to an - * appropriate value when completed before calling the done function. - * - * STATUS: REQUIRED FOR TARGET DRIVERS - */ - /* TODO: rename */ - int (* transfer_response)(struct scsi_cmnd *, - void (*done)(struct scsi_cmnd *)); - - /* - * This is an error handling strategy routine. You don't need to - * define one of these if you don't want to - there is a default - * routine that is present that should work in most cases. For those - * driver authors that have the inclination and ability to write their - * own strategy routine, this is where it is specified. Note - the - * strategy routine is *ALWAYS* run in the context of the kernel eh - * thread. Thus you are guaranteed to *NOT* be in an interrupt - * handler when you execute this, and you are also guaranteed to - * *NOT* have any other commands being queued while you are in the - * strategy routine. When you return from this function, operations - * return to normal. - * - * See scsi_error.c scsi_unjam_host for additional comments about - * what this function should and should not be attempting to do. - * - * Status: REQUIRED (at least one of them) - */ - int (* eh_abort_handler)(struct scsi_cmnd *); - int (* eh_device_reset_handler)(struct scsi_cmnd *); - int (* eh_target_reset_handler)(struct scsi_cmnd *); - int (* eh_bus_reset_handler)(struct scsi_cmnd *); - int (* eh_host_reset_handler)(struct scsi_cmnd *); - - /* - * Before the mid layer attempts to scan for a new device where none - * currently exists, it will call this entry in your driver. Should - * your driver need to allocate any structs or perform any other init - * items in order to send commands to a currently unused target/lun - * combo, then this is where you can perform those allocations. This - * is specifically so that drivers won't have to perform any kind of - * "is this a new device" checks in their queuecommand routine, - * thereby making the hot path a bit quicker. - * - * Return values: 0 on success, non-0 on failure - * - * Deallocation: If we didn't find any devices at this ID, you will - * get an immediate call to slave_destroy(). If we find something - * here then you will get a call to slave_configure(), then the - * device will be used for however long it is kept around, then when - * the device is removed from the system (or * possibly at reboot - * time), you will then get a call to slave_destroy(). This is - * assuming you implement slave_configure and slave_destroy. - * However, if you allocate memory and hang it off the device struct, - * then you must implement the slave_destroy() routine at a minimum - * in order to avoid leaking memory - * each time a device is tore down. - * - * Status: OPTIONAL - */ - int (* slave_alloc)(struct scsi_device *); - - /* - * Once the device has responded to an INQUIRY and we know the - * device is online, we call into the low level driver with the - * struct scsi_device *. If the low level device driver implements - * this function, it *must* perform the task of setting the queue - * depth on the device. All other tasks are optional and depend - * on what the driver supports and various implementation details. - * - * Things currently recommended to be handled at this time include: - * - * 1. Setting the device queue depth. Proper setting of this is - * described in the comments for scsi_adjust_queue_depth. - * 2. Determining if the device supports the various synchronous - * negotiation protocols. The device struct will already have - * responded to INQUIRY and the results of the standard items - * will have been shoved into the various device flag bits, eg. - * device->sdtr will be true if the device supports SDTR messages. - * 3. Allocating command structs that the device will need. - * 4. Setting the default timeout on this device (if needed). - * 5. Anything else the low level driver might want to do on a device - * specific setup basis... - * 6. Return 0 on success, non-0 on error. The device will be marked - * as offline on error so that no access will occur. If you return - * non-0, your slave_destroy routine will never get called for this - * device, so don't leave any loose memory hanging around, clean - * up after yourself before returning non-0 - * - * Status: OPTIONAL - */ - int (* slave_configure)(struct scsi_device *); - - /* - * Immediately prior to deallocating the device and after all activity - * has ceased the mid layer calls this point so that the low level - * driver may completely detach itself from the scsi device and vice - * versa. The low level driver is responsible for freeing any memory - * it allocated in the slave_alloc or slave_configure calls. - * - * Status: OPTIONAL - */ - void (* slave_destroy)(struct scsi_device *); - - /* - * Before the mid layer attempts to scan for a new device attached - * to a target where no target currently exists, it will call this - * entry in your driver. Should your driver need to allocate any - * structs or perform any other init items in order to send commands - * to a currently unused target, then this is where you can perform - * those allocations. - * - * Return values: 0 on success, non-0 on failure - * - * Status: OPTIONAL - */ - int (* target_alloc)(struct scsi_target *); - - /* - * Immediately prior to deallocating the target structure, and - * after all activity to attached scsi devices has ceased, the - * midlayer calls this point so that the driver may deallocate - * and terminate any references to the target. - * - * Status: OPTIONAL - */ - void (* target_destroy)(struct scsi_target *); - - /* - * If a host has the ability to discover targets on its own instead - * of scanning the entire bus, it can fill in this function and - * call scsi_scan_host(). This function will be called periodically - * until it returns 1 with the scsi_host and the elapsed time of - * the scan in jiffies. - * - * Status: OPTIONAL - */ - int (* scan_finished)(struct Scsi_Host *, unsigned long); - - /* - * If the host wants to be called before the scan starts, but - * after the midlayer has set up ready for the scan, it can fill - * in this function. - * - * Status: OPTIONAL - */ - void (* scan_start)(struct Scsi_Host *); - - /* - * Fill in this function to allow the queue depth of this host - * to be changeable (on a per device basis). Returns either - * the current queue depth setting (may be different from what - * was passed in) or an error. An error should only be - * returned if the requested depth is legal but the driver was - * unable to set it. If the requested depth is illegal, the - * driver should set and return the closest legal queue depth. - * - * Status: OPTIONAL - */ - int (* change_queue_depth)(struct scsi_device *, int); - - /* - * Fill in this function to allow the changing of tag types - * (this also allows the enabling/disabling of tag command - * queueing). An error should only be returned if something - * went wrong in the driver while trying to set the tag type. - * If the driver doesn't support the requested tag type, then - * it should set the closest type it does support without - * returning an error. Returns the actual tag type set. - * - * Status: OPTIONAL - */ - int (* change_queue_type)(struct scsi_device *, int); - - /* - * This function determines the BIOS parameters for a given - * harddisk. These tend to be numbers that are made up by - * the host adapter. Parameters: - * size, device, list (heads, sectors, cylinders) - * - * Status: OPTIONAL - */ - int (* bios_param)(struct scsi_device *, struct block_device *, - sector_t, int []); - - /* - * Can be used to export driver statistics and other infos to the - * world outside the kernel ie. userspace and it also provides an - * interface to feed the driver with information. - * - * Status: OBSOLETE - */ - int (*proc_info)(struct Scsi_Host *, char *, char **, off_t, int, int); - - /* - * This is an optional routine that allows the transport to become - * involved when a scsi io timer fires. The return value tells the - * timer routine how to finish the io timeout handling: - * EH_HANDLED: I fixed the error, please complete the command - * EH_RESET_TIMER: I need more time, reset the timer and - * begin counting again - * EH_NOT_HANDLED Begin normal error recovery - * - * Status: OPTIONAL - */ - enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *); - - /* - * Name of proc directory - */ - const char *proc_name; - - /* - * Used to store the procfs directory if a driver implements the - * proc_info method. - */ - struct proc_dir_entry *proc_dir; - - /* - * This determines if we will use a non-interrupt driven - * or an interrupt driven scheme. It is set to the maximum number - * of simultaneous commands a given host adapter will accept. - */ - int can_queue; - - /* - * In many instances, especially where disconnect / reconnect are - * supported, our host also has an ID on the SCSI bus. If this is - * the case, then it must be reserved. Please set this_id to -1 if - * your setup is in single initiator mode, and the host lacks an - * ID. - */ - int this_id; - - /* - * This determines the degree to which the host adapter is capable - * of scatter-gather. - */ - unsigned short sg_tablesize; - - /* - * Set this if the host adapter has limitations beside segment count. - */ - unsigned short max_sectors; - - /* - * DMA scatter gather segment boundary limit. A segment crossing this - * boundary will be split in two. - */ - unsigned long dma_boundary; - - /* - * This specifies "machine infinity" for host templates which don't - * limit the transfer size. Note this limit represents an absolute - * maximum, and may be over the transfer limits allowed for - * individual devices (e.g. 256 for SCSI-1). - */ -#define SCSI_DEFAULT_MAX_SECTORS 1024 - - /* - * True if this host adapter can make good use of linked commands. - * This will allow more than one command to be queued to a given - * unit on a given host. Set this to the maximum number of command - * blocks to be provided for each device. Set this to 1 for one - * command block per lun, 2 for two, etc. Do not set this to 0. - * You should make sure that the host adapter will do the right thing - * before you try setting this above 1. - */ - short cmd_per_lun; - - /* - * present contains counter indicating how many boards of this - * type were found when we did the scan. - */ - unsigned char present; - - /* - * This specifies the mode that a LLD supports. - */ - unsigned supported_mode:2; - - /* - * True if this host adapter uses unchecked DMA onto an ISA bus. - */ - unsigned unchecked_isa_dma:1; - - /* - * True if this host adapter can make good use of clustering. - * I originally thought that if the tablesize was large that it - * was a waste of CPU cycles to prepare a cluster list, but - * it works out that the Buslogic is faster if you use a smaller - * number of segments (i.e. use clustering). I guess it is - * inefficient. - */ - unsigned use_clustering:1; - - /* - * True for emulated SCSI host adapters (e.g. ATAPI). - */ - unsigned emulated:1; - - /* - * True if the low-level driver performs its own reset-settle delays. - */ - unsigned skip_settle_delay:1; - - /* - * True if we are using ordered write support. - */ - unsigned ordered_tag:1; - - /* - * Countdown for host blocking with no commands outstanding. - */ - unsigned int max_host_blocked; - - /* - * Default value for the blocking. If the queue is empty, - * host_blocked counts down in the request_fn until it restarts - * host operations as zero is reached. - * - * FIXME: This should probably be a value in the template - */ -#define SCSI_DEFAULT_HOST_BLOCKED 7 - - /* - * Pointer to the sysfs class properties for this host, NULL terminated. - */ - struct device_attribute **shost_attrs; - - /* - * Pointer to the SCSI device properties for this host, NULL terminated. - */ - struct device_attribute **sdev_attrs; - - /* - * List of hosts per template. - * - * This is only for use by scsi_module.c for legacy templates. - * For these access to it is synchronized implicitly by - * module_init/module_exit. - */ - struct list_head legacy_hosts; -}; - -/* - * shost state: If you alter this, you also need to alter scsi_sysfs.c - * (for the ascii descriptions) and the state model enforcer: - * scsi_host_set_state() - */ -enum scsi_host_state { - SHOST_CREATED = 1, - SHOST_RUNNING, - SHOST_CANCEL, - SHOST_DEL, - SHOST_RECOVERY, - SHOST_CANCEL_RECOVERY, - SHOST_DEL_RECOVERY, -}; - -struct Scsi_Host { - /* - * __devices is protected by the host_lock, but you should - * usually use scsi_device_lookup / shost_for_each_device - * to access it and don't care about locking yourself. - * In the rare case of beeing in irq context you can use - * their __ prefixed variants with the lock held. NEVER - * access this list directly from a driver. - */ - struct list_head __devices; - struct list_head __targets; - - struct scsi_host_cmd_pool *cmd_pool; - spinlock_t free_list_lock; - struct list_head free_list; /* backup store of cmd structs */ - struct list_head starved_list; - - spinlock_t default_lock; - spinlock_t *host_lock; - - struct mutex scan_mutex;/* serialize scanning activity */ - - struct list_head eh_cmd_q; - struct task_struct * ehandler; /* Error recovery thread. */ - struct completion * eh_action; /* Wait for specific actions on the - host. */ - wait_queue_head_t host_wait; - struct scsi_host_template *hostt; - struct scsi_transport_template *transportt; - - /* - * Area to keep a shared tag map (if needed, will be - * NULL if not). - */ - struct blk_queue_tag *bqt; - - /* - * The following two fields are protected with host_lock; - * however, eh routines can safely access during eh processing - * without acquiring the lock. - */ - unsigned int host_busy; /* commands actually active on low-level */ - unsigned int host_failed; /* commands that failed. */ - unsigned int host_eh_scheduled; /* EH scheduled without command */ - - 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; - - /* - * These three parameters can be used to allow for wide scsi, - * and for host adapters that support multiple busses - * The first two should be set to 1 more than the actual max id - * or lun (i.e. 8 for normal systems). - */ - unsigned int max_id; - unsigned int max_lun; - unsigned int max_channel; - - /* - * This is a unique identifier that must be assigned so that we - * have some way of identifying each detected host adapter properly - * and uniquely. For hosts that do not support more than one card - * in the system at one time, this does not need to be set. It is - * initialized to 0 in scsi_register. - */ - unsigned int unique_id; - - /* - * 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. - */ - unsigned short max_cmd_len; - - int this_id; - int can_queue; - short cmd_per_lun; - short unsigned int sg_tablesize; - short unsigned int max_sectors; - unsigned long dma_boundary; - /* - * Used to assign serial numbers to the cmds. - * Protected by the host lock. - */ - unsigned long cmd_serial_number; - - unsigned active_mode:2; - unsigned unchecked_isa_dma:1; - unsigned use_clustering:1; - unsigned use_blk_tcq:1; - - /* - * Host has requested that no further requests come through for the - * time being. - */ - unsigned host_self_blocked:1; - - /* - * Host uses correct SCSI ordering not PC ordering. The bit is - * set for the minority of drivers whose authors actually read - * the spec ;). - */ - unsigned reverse_ordering:1; - - /* - * Ordered write support - */ - unsigned ordered_tag:1; - - /* Task mgmt function in progress */ - unsigned tmf_in_progress:1; - - /* Asynchronous scan in progress */ - unsigned async_scan:1; - - /* - * Optional work queue to be utilized by the transport - */ - char work_q_name[20]; - struct workqueue_struct *work_q; - - /* - * Host has rejected a command because it was busy. - */ - unsigned int host_blocked; - - /* - * Value host_blocked counts down from - */ - 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 - */ - struct request_queue *uspace_req_q; - - /* legacy crap */ - unsigned long base; - unsigned long io_port; - unsigned char n_io_port; - unsigned char dma_channel; - unsigned int irq; - - - enum scsi_host_state shost_state; - - /* ldm bits */ - struct device shost_gendev, shost_dev; - - /* - * List of hosts per template. - * - * This is only for use by scsi_module.c for legacy templates. - * For these access to it is synchronized implicitly by - * module_init/module_exit. - */ - struct list_head sht_legacy_list; - - /* - * Points to the transport data (if any) which is allocated - * separately - */ - void *shost_data; - - /* - * We should ensure that this is aligned, both for better performance - * and also because some compilers (m68k) don't automatically force - * alignment to a long boundary. - */ - unsigned long hostdata[0] /* Used for storage of host specific stuff */ - __attribute__ ((aligned (sizeof(unsigned long)))); -}; - -#define class_to_shost(d) \ - container_of(d, struct Scsi_Host, shost_dev) - -#define shost_printk(prefix, shost, fmt, a...) \ - dev_printk(prefix, &(shost)->shost_gendev, fmt, ##a) - -static inline void *shost_priv(struct Scsi_Host *shost) -{ - return (void *)shost->hostdata; -} - -int scsi_is_host_device(const struct device *); - -static inline struct Scsi_Host *dev_to_shost(struct device *dev) -{ - while (!scsi_is_host_device(dev)) { - if (!dev->parent) - return NULL; - dev = dev->parent; - } - return container_of(dev, struct Scsi_Host, shost_gendev); -} - -static inline int scsi_host_in_recovery(struct Scsi_Host *shost) -{ - return shost->shost_state == SHOST_RECOVERY || - shost->shost_state == SHOST_CANCEL_RECOVERY || - shost->shost_state == SHOST_DEL_RECOVERY || - shost->tmf_in_progress; -} - -extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *); -extern void scsi_flush_work(struct Scsi_Host *); - -extern struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *, int); -extern int __must_check scsi_add_host(struct Scsi_Host *, struct device *); -extern void scsi_scan_host(struct Scsi_Host *); -extern void scsi_rescan_device(struct device *); -extern void scsi_remove_host(struct Scsi_Host *); -extern struct Scsi_Host *scsi_host_get(struct Scsi_Host *); -extern void scsi_host_put(struct Scsi_Host *t); -extern struct Scsi_Host *scsi_host_lookup(unsigned short); -extern const char *scsi_host_state_name(enum scsi_host_state); - -extern u64 scsi_calculate_bounce_limit(struct Scsi_Host *); - -static inline struct device *scsi_get_device(struct Scsi_Host *shost) -{ - return shost->shost_gendev.parent; -} - -/** - * scsi_host_scan_allowed - Is scanning of this host allowed - * @shost: Pointer to Scsi_Host. - **/ -static inline int scsi_host_scan_allowed(struct Scsi_Host *shost) -{ - return shost->shost_state == SHOST_RUNNING; -} - -extern void scsi_unblock_requests(struct Scsi_Host *); -extern void scsi_block_requests(struct Scsi_Host *); - -struct class_container; - -extern struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, - void (*) (struct request_queue *)); -/* - * These two functions are used to allocate and free a pseudo device - * which will connect to the host adapter itself rather than any - * physical device. You must deallocate when you are done with the - * thing. This physical pseudo-device isn't real and won't be available - * from any high-level drivers. - */ -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 *); -extern int scsi_host_set_state(struct Scsi_Host *, enum scsi_host_state); - -#endif /* _SCSI_SCSI_HOST_H */ |