diff options
Diffstat (limited to 'drivers/scsi/scsi_debug.c')
| -rw-r--r-- | drivers/scsi/scsi_debug.c | 137 |
1 files changed, 52 insertions, 85 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index fc8b3aa083d..3f096a6681a 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -1710,6 +1710,50 @@ static int do_device_access(struct scsi_cmnd *scmd, return ret; } +static u16 dif_compute_csum(const void *buf, int len) +{ + u16 csum; + + switch (scsi_debug_guard) { + case 1: + csum = ip_compute_csum(buf, len); + break; + case 0: + csum = cpu_to_be16(crc_t10dif(buf, len)); + break; + } + return csum; +} + +static int dif_verify(struct sd_dif_tuple *sdt, const void *data, + sector_t sector, u32 ei_lba) +{ + u16 csum = dif_compute_csum(data, scsi_debug_sector_size); + + if (sdt->guard_tag != csum) { + pr_err("%s: GUARD check failed on sector %lu rcvd 0x%04x, data 0x%04x\n", + __func__, + (unsigned long)sector, + be16_to_cpu(sdt->guard_tag), + be16_to_cpu(csum)); + return 0x01; + } + if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION && + be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { + pr_err("%s: REF check failed on sector %lu\n", + __func__, (unsigned long)sector); + return 0x03; + } + if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION && + be32_to_cpu(sdt->ref_tag) != ei_lba) { + pr_err("%s: REF check failed on sector %lu\n", + __func__, (unsigned long)sector); + dif_errors++; + return 0x03; + } + return 0; +} + static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec, unsigned int sectors, u32 ei_lba) { @@ -1725,53 +1769,19 @@ static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec, sdt = dif_storep + start_sec; for (i = 0 ; i < sectors ; i++) { - u16 csum; + int ret; if (sdt[i].app_tag == 0xffff) continue; sector = start_sec + i; - switch (scsi_debug_guard) { - case 1: - csum = ip_compute_csum(fake_storep + - sector * scsi_debug_sector_size, - scsi_debug_sector_size); - break; - case 0: - csum = crc_t10dif(fake_storep + - sector * scsi_debug_sector_size, - scsi_debug_sector_size); - csum = cpu_to_be16(csum); - break; - default: - BUG(); - } - - if (sdt[i].guard_tag != csum) { - printk(KERN_ERR "%s: GUARD check failed on sector %lu" \ - " rcvd 0x%04x, data 0x%04x\n", __func__, - (unsigned long)sector, - be16_to_cpu(sdt[i].guard_tag), - be16_to_cpu(csum)); - dif_errors++; - return 0x01; - } - - if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION && - be32_to_cpu(sdt[i].ref_tag) != (sector & 0xffffffff)) { - printk(KERN_ERR "%s: REF check failed on sector %lu\n", - __func__, (unsigned long)sector); - dif_errors++; - return 0x03; - } - - if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION && - be32_to_cpu(sdt[i].ref_tag) != ei_lba) { - printk(KERN_ERR "%s: REF check failed on sector %lu\n", - __func__, (unsigned long)sector); + ret = dif_verify(&sdt[i], + fake_storep + sector * scsi_debug_sector_size, + sector, ei_lba); + if (ret) { dif_errors++; - return 0x03; + return ret; } ei_lba++; @@ -1880,7 +1890,6 @@ static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec, sector_t tmp_sec = start_sec; sector_t sector; int ppage_offset; - unsigned short csum; sector = do_div(tmp_sec, sdebug_store_sectors); @@ -1911,50 +1920,8 @@ static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec, sdt = paddr + ppage_offset; - switch (scsi_debug_guard) { - case 1: - csum = ip_compute_csum(daddr + j, - scsi_debug_sector_size); - break; - case 0: - csum = cpu_to_be16(crc_t10dif(daddr + j, - scsi_debug_sector_size)); - break; - default: - BUG(); - ret = 0; - goto out; - } - - if (sdt->guard_tag != csum) { - printk(KERN_ERR - "%s: GUARD check failed on sector %lu " \ - "rcvd 0x%04x, calculated 0x%04x\n", - __func__, (unsigned long)sector, - be16_to_cpu(sdt->guard_tag), - be16_to_cpu(csum)); - ret = 0x01; - dump_sector(daddr + j, scsi_debug_sector_size); - goto out; - } - - if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION && - be32_to_cpu(sdt->ref_tag) - != (start_sec & 0xffffffff)) { - printk(KERN_ERR - "%s: REF check failed on sector %lu\n", - __func__, (unsigned long)sector); - ret = 0x03; - dump_sector(daddr + j, scsi_debug_sector_size); - goto out; - } - - if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION && - be32_to_cpu(sdt->ref_tag) != ei_lba) { - printk(KERN_ERR - "%s: REF check failed on sector %lu\n", - __func__, (unsigned long)sector); - ret = 0x03; + ret = dif_verify(sdt, daddr + j, start_sec, ei_lba); + if (ret) { dump_sector(daddr + j, scsi_debug_sector_size); goto out; } |