diff options
Diffstat (limited to 'drivers/scsi/sd.h')
| -rw-r--r-- | drivers/scsi/sd.h | 66 |
1 files changed, 64 insertions, 2 deletions
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h index 4c3ab8377fd3..467377884b63 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -167,6 +167,68 @@ enum sd_dif_target_protection_types { }; /* + * Look up the DIX operation based on whether the command is read or + * write and whether dix and dif are enabled. + */ +static inline unsigned int sd_prot_op(bool write, bool dix, bool dif) +{ + /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */ + const unsigned int ops[] = { /* wrt dix dif */ + SCSI_PROT_NORMAL, /* 0 0 0 */ + SCSI_PROT_READ_STRIP, /* 0 0 1 */ + SCSI_PROT_READ_INSERT, /* 0 1 0 */ + SCSI_PROT_READ_PASS, /* 0 1 1 */ + SCSI_PROT_NORMAL, /* 1 0 0 */ + SCSI_PROT_WRITE_INSERT, /* 1 0 1 */ + SCSI_PROT_WRITE_STRIP, /* 1 1 0 */ + SCSI_PROT_WRITE_PASS, /* 1 1 1 */ + }; + + return ops[write << 2 | dix << 1 | dif]; +} + +/* + * Returns a mask of the protection flags that are valid for a given DIX + * operation. + */ +static inline unsigned int sd_prot_flag_mask(unsigned int prot_op) +{ + const unsigned int flag_mask[] = { + [SCSI_PROT_NORMAL] = 0, + + [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI | + SCSI_PROT_GUARD_CHECK | + SCSI_PROT_REF_CHECK | + SCSI_PROT_REF_INCREMENT, + + [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT | + SCSI_PROT_IP_CHECKSUM, + + [SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI | + SCSI_PROT_GUARD_CHECK | + SCSI_PROT_REF_CHECK | + SCSI_PROT_REF_INCREMENT | + SCSI_PROT_IP_CHECKSUM, + + [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI | + SCSI_PROT_REF_INCREMENT, + + [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK | + SCSI_PROT_REF_CHECK | + SCSI_PROT_REF_INCREMENT | + SCSI_PROT_IP_CHECKSUM, + + [SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI | + SCSI_PROT_GUARD_CHECK | + SCSI_PROT_REF_CHECK | + SCSI_PROT_REF_INCREMENT | + SCSI_PROT_IP_CHECKSUM, + }; + + return flag_mask[prot_op]; +} + +/* * Data Integrity Field tuple. */ struct sd_dif_tuple { @@ -178,7 +240,7 @@ struct sd_dif_tuple { #ifdef CONFIG_BLK_DEV_INTEGRITY extern void sd_dif_config_host(struct scsi_disk *); -extern void sd_dif_prepare(struct request *rq, sector_t, unsigned int); +extern void sd_dif_prepare(struct scsi_cmnd *scmd); extern void sd_dif_complete(struct scsi_cmnd *, unsigned int); #else /* CONFIG_BLK_DEV_INTEGRITY */ @@ -186,7 +248,7 @@ extern void sd_dif_complete(struct scsi_cmnd *, unsigned int); static inline void sd_dif_config_host(struct scsi_disk *disk) { } -static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a) +static inline int sd_dif_prepare(struct scsi_cmnd *scmd) { return 0; } |