diff options
| -rw-r--r-- | block/Kconfig | 1 | ||||
| -rw-r--r-- | block/Makefile | 4 | ||||
| -rw-r--r-- | block/t10-pi.c | 197 | ||||
| -rw-r--r-- | drivers/scsi/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/scsi/sd_dif.c | 241 | ||||
| -rw-r--r-- | include/linux/crc-t10dif.h | 5 | ||||
| -rw-r--r-- | include/linux/t10-pi.h | 22 |
7 files changed, 245 insertions, 226 deletions
diff --git a/block/Kconfig b/block/Kconfig index 2429515..161491d 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -77,6 +77,7 @@ config BLK_DEV_BSGLIB config BLK_DEV_INTEGRITY bool "Block layer data integrity support" + select CRC_T10DIF if BLK_DEV_INTEGRITY ---help--- Some storage devices allow extra information to be stored/retrieved to help protect the data. The block layer diff --git a/block/Makefile b/block/Makefile index a2ce6ac..00ecc97 100644 --- a/block/Makefile +++ b/block/Makefile @@ -20,6 +20,6 @@ obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o -obj-$(CONFIG_BLK_DEV_INTEGRITY) += blk-integrity.o obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o -obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o +obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o + diff --git a/block/t10-pi.c b/block/t10-pi.c new file mode 100644 index 0000000..24d6e97 --- /dev/null +++ b/block/t10-pi.c @@ -0,0 +1,197 @@ +/* + * t10_pi.c - Functions for generating and verifying T10 Protection + * Information. + * + * Copyright (C) 2007, 2008, 2014 Oracle Corporation + * Written by: Martin K. Petersen <martin.petersen@oracle.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, + * USA. + * + */ + +#include <linux/t10-pi.h> +#include <linux/blkdev.h> +#include <linux/crc-t10dif.h> +#include <net/checksum.h> + +typedef __be16 (csum_fn) (void *, unsigned int); + +static const __be16 APP_ESCAPE = (__force __be16) 0xffff; +static const __be32 REF_ESCAPE = (__force __be32) 0xffffffff; + +static __be16 t10_pi_crc_fn(void *data, unsigned int len) +{ + return cpu_to_be16(crc_t10dif(data, len)); +} + +static __be16 t10_pi_ip_fn(void *data, unsigned int len) +{ + return (__force __be16)ip_compute_csum(data, len); +} + +/* + * Type 1 and Type 2 protection use the same format: 16 bit guard tag, + * 16 bit app tag, 32 bit reference tag. Type 3 does not define the ref + * tag. + */ +static int t10_pi_generate(struct blk_integrity_iter *iter, csum_fn *fn, + unsigned int type) +{ + unsigned int i; + + for (i = 0 ; i < iter->data_size ; i += iter->interval) { + struct t10_pi_tuple *pi = iter->prot_buf; + + pi->guard_tag = fn(iter->data_buf, iter->interval); + pi->app_tag = 0; + + if (type == 1) + pi->ref_tag = cpu_to_be32(lower_32_bits(iter->seed)); + else + pi->ref_tag = 0; + + iter->data_buf += iter->interval; + iter->prot_buf += sizeof(struct t10_pi_tuple); + iter->seed++; + } + + return 0; +} + +static int t10_pi_verify(struct blk_integrity_iter *iter, csum_fn *fn, + unsigned int type) +{ + unsigned int i; + + for (i = 0 ; i < iter->data_size ; i += iter->interval) { + struct t10_pi_tuple *pi = iter->prot_buf; + __be16 csum; + + switch (type) { + case 1: + case 2: + if (pi->app_tag == APP_ESCAPE) + goto next; + + if (be32_to_cpu(pi->ref_tag) != + lower_32_bits(iter->seed)) { + pr_err("%s: ref tag error at location %llu " \ + "(rcvd %u)\n", iter->disk_name, + (unsigned long long) + iter->seed, be32_to_cpu(pi->ref_tag)); + return -EILSEQ; + } + break; + case 3: + if (pi->app_tag == APP_ESCAPE && + pi->ref_tag == REF_ESCAPE) + goto next; + break; + } + + csum = fn(iter->data_buf, iter->interval); + + if (pi->guard_tag != csum) { + pr_err("%s: guard tag error at sector %llu " \ + "(rcvd %04x, want %04x)\n", iter->disk_name, + (unsigned long long)iter->seed, + be16_to_cpu(pi->guard_tag), be16_to_cpu(csum)); + return -EILSEQ; + } + +next: + iter->data_buf += iter->interval; + iter->prot_buf += sizeof(struct t10_pi_tuple); + iter->seed++; + } + + return 0; +} + +static int t10_pi_type1_generate_crc(struct blk_integrity_iter *iter) +{ + return t10_pi_generate(iter, t10_pi_crc_fn, 1); +} + +static int t10_pi_type1_generate_ip(struct blk_integrity_iter *iter) +{ + return t10_pi_generate(iter, t10_pi_ip_fn, 1); +} + +static int t10_pi_type1_verify_crc(struct blk_integrity_iter *iter) +{ + return t10_pi_verify(iter, t10_pi_crc_fn, 1); +} + +static int t10_pi_type1_verify_ip(struct blk_integrity_iter *iter) +{ + return t10_pi_verify(iter, t10_pi_ip_fn, 1); +} + +static int t10_pi_type3_generate_crc(struct blk_integrity_iter *iter) +{ + return t10_pi_generate(iter, t10_pi_crc_fn, 3); +} + +static int t10_pi_type3_generate_ip(struct blk_integrity_iter *iter) +{ + return t10_pi_generate(iter, t10_pi_ip_fn, 3); +} + +static int t10_pi_type3_verify_crc(struct blk_integrity_iter *iter) +{ + return t10_pi_verify(iter, t10_pi_crc_fn, 3); +} + +static int t10_pi_type3_verify_ip(struct blk_integrity_iter *iter) +{ + return t10_pi_verify(iter, t10_pi_ip_fn, 3); +} + +struct blk_integrity t10_pi_type1_crc = { + .name = "T10-DIF-TYPE1-CRC", + .generate_fn = t10_pi_type1_generate_crc, + .verify_fn = t10_pi_type1_verify_crc, + .tuple_size = sizeof(struct t10_pi_tuple), + .tag_size = 0, +}; +EXPORT_SYMBOL(t10_pi_type1_crc); + +struct blk_integrity t10_pi_type1_ip = { + .name = "T10-DIF-TYPE1-IP", + .generate_fn = t10_pi_type1_generate_ip, + .verify_fn = t10_pi_type1_verify_ip, + .tuple_size = sizeof(struct t10_pi_tuple), + .tag_size = 0, +}; +EXPORT_SYMBOL(t10_pi_type1_ip); + +struct blk_integrity t10_pi_type3_crc = { + .name = "T10-DIF-TYPE3-CRC", + .generate_fn = t10_pi_type3_generate_crc, + .verify_fn = t10_pi_type3_verify_crc, + .tuple_size = sizeof(struct t10_pi_tuple), + .tag_size = 0, +}; +EXPORT_SYMBOL(t10_pi_type3_crc); + +struct blk_integrity t10_pi_type3_ip = { + .name = "T10-DIF-TYPE3-IP", + .generate_fn = t10_pi_type3_generate_ip, + .verify_fn = t10_pi_type3_verify_ip, + .tuple_size = sizeof(struct t10_pi_tuple), + .tag_size = 0, +}; +EXPORT_SYMBOL(t10_pi_type3_ip); diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index 18a3358..9ece13f 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -62,7 +62,6 @@ comment "SCSI support type (disk, tape, CD-ROM)" config BLK_DEV_SD tristate "SCSI disk support" depends on SCSI - select CRC_T10DIF if BLK_DEV_INTEGRITY ---help--- If you want to use SCSI hard disks, Fibre Channel disks, Serial ATA (SATA) or Parallel ATA (PATA) hard disks, diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c index 2198abe..b7eaead 100644 --- a/drivers/scsi/sd_dif.c +++ b/drivers/scsi/sd_dif.c @@ -21,7 +21,7 @@ */ #include <linux/blkdev.h> -#include <linux/crc-t10dif.h> +#include <linux/t10-pi.h> #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> @@ -33,207 +33,8 @@ #include <scsi/scsi_ioctl.h> #include <scsi/scsicam.h> -#include <net/checksum.h> - #include "sd.h" -typedef __u16 (csum_fn) (void *, unsigned int); - -static __u16 sd_dif_crc_fn(void *data, unsigned int len) -{ - return cpu_to_be16(crc_t10dif(data, len)); -} - -static __u16 sd_dif_ip_fn(void *data, unsigned int len) -{ - return ip_compute_csum(data, len); -} - -/* - * Type 1 and Type 2 protection use the same format: 16 bit guard tag, - * 16 bit app tag, 32 bit reference tag. - */ -static void sd_dif_type1_generate(struct blk_integrity_iter *iter, csum_fn *fn) -{ - void *buf = iter->data_buf; - struct sd_dif_tuple *sdt = iter->prot_buf; - sector_t seed = iter->seed; - unsigned int i; - - for (i = 0 ; i < iter->data_size ; i += iter->interval, sdt++) { - sdt->guard_tag = fn(buf, iter->interval); - sdt->ref_tag = cpu_to_be32(seed & 0xffffffff); - sdt->app_tag = 0; - - buf += iter->interval; - seed++; - } -} - -static int sd_dif_type1_generate_crc(struct blk_integrity_iter *iter) -{ - sd_dif_type1_generate(iter, sd_dif_crc_fn); - return 0; -} - -static int sd_dif_type1_generate_ip(struct blk_integrity_iter *iter) -{ - sd_dif_type1_generate(iter, sd_dif_ip_fn); - return 0; -} - -static int sd_dif_type1_verify(struct blk_integrity_iter *iter, csum_fn *fn) -{ - void *buf = iter->data_buf; - struct sd_dif_tuple *sdt = iter->prot_buf; - sector_t seed = iter->seed; - unsigned int i; - __u16 csum; - - for (i = 0 ; i < iter->data_size ; i += iter->interval, sdt++) { - /* Unwritten sectors */ - if (sdt->app_tag == 0xffff) - return 0; - - if (be32_to_cpu(sdt->ref_tag) != (seed & 0xffffffff)) { - printk(KERN_ERR - "%s: ref tag error on sector %lu (rcvd %u)\n", - iter->disk_name, (unsigned long)seed, - be32_to_cpu(sdt->ref_tag)); - return -EIO; - } - - csum = fn(buf, iter->interval); - - if (sdt->guard_tag != csum) { - printk(KERN_ERR "%s: guard tag error on sector %lu " \ - "(rcvd %04x, data %04x)\n", iter->disk_name, - (unsigned long)seed, - be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); - return -EIO; - } - - buf += iter->interval; - seed++; - } - - return 0; -} - -static int sd_dif_type1_verify_crc(struct blk_integrity_iter *iter) -{ - return sd_dif_type1_verify(iter, sd_dif_crc_fn); -} - -static int sd_dif_type1_verify_ip(struct blk_integrity_iter *iter) -{ - return sd_dif_type1_verify(iter, sd_dif_ip_fn); -} - -static struct blk_integrity dif_type1_integrity_crc = { - .name = "T10-DIF-TYPE1-CRC", - .generate_fn = sd_dif_type1_generate_crc, - .verify_fn = sd_dif_type1_verify_crc, - .tuple_size = sizeof(struct sd_dif_tuple), - .tag_size = 0, -}; - -static struct blk_integrity dif_type1_integrity_ip = { - .name = "T10-DIF-TYPE1-IP", - .generate_fn = sd_dif_type1_generate_ip, - .verify_fn = sd_dif_type1_verify_ip, - .tuple_size = sizeof(struct sd_dif_tuple), - .tag_size = 0, -}; - - -/* - * Type 3 protection has a 16-bit guard tag and 16 + 32 bits of opaque - * tag space. - */ -static void sd_dif_type3_generate(struct blk_integrity_iter *iter, csum_fn *fn) -{ - void *buf = iter->data_buf; - struct sd_dif_tuple *sdt = iter->prot_buf; - unsigned int i; - - for (i = 0 ; i < iter->data_size ; i += iter->interval, sdt++) { - sdt->guard_tag = fn(buf, iter->interval); - sdt->ref_tag = 0; - sdt->app_tag = 0; - - buf += iter->interval; - } -} - -static int sd_dif_type3_generate_crc(struct blk_integrity_iter *iter) -{ - sd_dif_type3_generate(iter, sd_dif_crc_fn); - return 0; -} - -static int sd_dif_type3_generate_ip(struct blk_integrity_iter *iter) -{ - sd_dif_type3_generate(iter, sd_dif_ip_fn); - return 0; -} - -static int sd_dif_type3_verify(struct blk_integrity_iter *iter, csum_fn *fn) -{ - void *buf = iter->data_buf; - struct sd_dif_tuple *sdt = iter->prot_buf; - sector_t seed = iter->seed; - unsigned int i; - __u16 csum; - - for (i = 0 ; i < iter->data_size ; i += iter->interval, sdt++) { - /* Unwritten sectors */ - if (sdt->app_tag == 0xffff && sdt->ref_tag == 0xffffffff) - return 0; - - csum = fn(buf, iter->interval); - - if (sdt->guard_tag != csum) { - printk(KERN_ERR "%s: guard tag error on sector %lu " \ - "(rcvd %04x, data %04x)\n", iter->disk_name, - (unsigned long)seed, - be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); - return -EIO; - } - - buf += iter->interval; - seed++; - } - - return 0; -} - -static int sd_dif_type3_verify_crc(struct blk_integrity_iter *iter) -{ - return sd_dif_type3_verify(iter, sd_dif_crc_fn); -} - -static int sd_dif_type3_verify_ip(struct blk_integrity_iter *iter) -{ - return sd_dif_type3_verify(iter, sd_dif_ip_fn); -} - -static struct blk_integrity dif_type3_integrity_crc = { - .name = "T10-DIF-TYPE3-CRC", - .generate_fn = sd_dif_type3_generate_crc, - .verify_fn = sd_dif_type3_verify_crc, - .tuple_size = sizeof(struct sd_dif_tuple), - .tag_size = 0, -}; - -static struct blk_integrity dif_type3_integrity_ip = { - .name = "T10-DIF-TYPE3-IP", - .generate_fn = sd_dif_type3_generate_ip, - .verify_fn = sd_dif_type3_verify_ip, - .tuple_size = sizeof(struct sd_dif_tuple), - .tag_size = 0, -}; - /* * Configure exchange of protection information between OS and HBA. */ @@ -257,16 +58,16 @@ void sd_dif_config_host(struct scsi_disk *sdkp) /* Enable DMA of protection information */ if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP) { if (type == SD_DIF_TYPE3_PROTECTION) - blk_integrity_register(disk, &dif_type3_integrity_ip); + blk_integrity_register(disk, &t10_pi_type3_ip); else - blk_integrity_register(disk, &dif_type1_integrity_ip); + blk_integrity_register(disk, &t10_pi_type1_ip); disk->integrity->flags |= BLK_INTEGRITY_IP_CHECKSUM; } else if (type == SD_DIF_TYPE3_PROTECTION) - blk_integrity_register(disk, &dif_type3_integrity_crc); + blk_integrity_register(disk, &t10_pi_type3_crc); else - blk_integrity_register(disk, &dif_type1_integrity_crc); + blk_integrity_register(disk, &t10_pi_type1_crc); sd_printk(KERN_NOTICE, sdkp, "Enabling DIX %s protection\n", disk->integrity->name); @@ -308,10 +109,10 @@ void sd_dif_config_host(struct scsi_disk *sdkp) void sd_dif_prepare(struct request *rq, sector_t hw_sector, unsigned int sector_sz) { - const int tuple_sz = sizeof(struct sd_dif_tuple); + const int tuple_sz = sizeof(struct t10_pi_tuple); struct bio *bio; struct scsi_disk *sdkp; - struct sd_dif_tuple *sdt; + struct t10_pi_tuple *pi; u32 phys, virt; sdkp = rq->bio->bi_bdev->bd_disk->private_data; @@ -334,19 +135,18 @@ void sd_dif_prepare(struct request *rq, sector_t hw_sector, virt = bip_get_seed(bip) & 0xffffffff; bip_for_each_vec(iv, bip, iter) { - sdt = kmap_atomic(iv.bv_page) - + iv.bv_offset; + pi = kmap_atomic(iv.bv_page) + iv.bv_offset; - for (j = 0; j < iv.bv_len; j += tuple_sz, sdt++) { + for (j = 0; j < iv.bv_len; j += tuple_sz, pi++) { - if (be32_to_cpu(sdt->ref_tag) == virt) - sdt->ref_tag = cpu_to_be32(phys); + if (be32_to_cpu(pi->ref_tag) == virt) + pi->ref_tag = cpu_to_be32(phys); virt++; phys++; } - kunmap_atomic(sdt); + kunmap_atomic(pi); } bip->bip_flags |= BIP_MAPPED_INTEGRITY; @@ -359,10 +159,10 @@ void sd_dif_prepare(struct request *rq, sector_t hw_sector, */ void sd_dif_complete(struct scsi_cmnd *scmd, unsigned int good_bytes) { - const int tuple_sz = sizeof(struct sd_dif_tuple); + const int tuple_sz = sizeof(struct t10_pi_tuple); struct scsi_disk *sdkp; struct bio *bio; - struct sd_dif_tuple *sdt; + struct t10_pi_tuple *pi; unsigned int j, sectors, sector_sz; u32 phys, virt; @@ -386,25 +186,24 @@ void sd_dif_complete(struct scsi_cmnd *scmd, unsigned int good_bytes) virt = bip_get_seed(bip) & 0xffffffff; bip_for_each_vec(iv, bip, iter) { - sdt = kmap_atomic(iv.bv_page) - + iv.bv_offset; + pi = kmap_atomic(iv.bv_page) + iv.bv_offset; - for (j = 0; j < iv.bv_len; j += tuple_sz, sdt++) { + for (j = 0; j < iv.bv_len; j += tuple_sz, pi++) { if (sectors == 0) { - kunmap_atomic(sdt); + kunmap_atomic(pi); return; } - if (be32_to_cpu(sdt->ref_tag) == phys) - sdt->ref_tag = cpu_to_be32(virt); + if (be32_to_cpu(pi->ref_tag) == phys) + pi->ref_tag = cpu_to_be32(virt); virt++; phys++; sectors--; } - kunmap_atomic(sdt); + kunmap_atomic(pi); } } } diff --git a/include/linux/crc-t10dif.h b/include/linux/crc-t10dif.h index b3cb71f..cf53d07 100644 --- a/include/linux/crc-t10dif.h +++ b/include/linux/crc-t10dif.h @@ -6,7 +6,8 @@ #define CRC_T10DIF_DIGEST_SIZE 2 #define CRC_T10DIF_BLOCK_SIZE 1 -__u16 crc_t10dif_generic(__u16 crc, const unsigned char *buffer, size_t len); -__u16 crc_t10dif(unsigned char const *, size_t); +extern __u16 crc_t10dif_generic(__u16 crc, const unsigned char *buffer, + size_t len); +extern __u16 crc_t10dif(unsigned char const *, size_t); #endif diff --git a/include/linux/t10-pi.h b/include/linux/t10-pi.h new file mode 100644 index 0000000..6a8b994 --- /dev/null +++ b/include/linux/t10-pi.h @@ -0,0 +1,22 @@ +#ifndef _LINUX_T10_PI_H +#define _LINUX_T10_PI_H + +#include <linux/types.h> +#include <linux/blkdev.h> + +/* + * T10 Protection Information tuple. + */ +struct t10_pi_tuple { + __be16 guard_tag; /* Checksum */ + __be16 app_tag; /* Opaque storage */ + __be32 ref_tag; /* Target LBA or indirect LBA */ +}; + + +extern struct blk_integrity t10_pi_type1_crc; +extern struct blk_integrity t10_pi_type1_ip; +extern struct blk_integrity t10_pi_type3_crc; +extern struct blk_integrity t10_pi_type3_ip; + +#endif |
