diff options
Diffstat (limited to 'include/scsi/scsi_host.h')
| -rw-r--r-- | include/scsi/scsi_host.h | 86 |
1 files changed, 85 insertions, 1 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index a594bac4a77..44a55d1bf53 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -547,7 +547,7 @@ 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; @@ -636,6 +636,10 @@ 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 @@ -756,6 +760,86 @@ 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 *); |