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2341c2f8c3
The T10 Protection Information format is also used by some devices that do not go through the SCSI layer (virtual block devices, NVMe). Relocate the relevant functions to a block layer library that can be used without involving SCSI. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
198 lines
5.1 KiB
C
198 lines
5.1 KiB
C
/*
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* t10_pi.c - Functions for generating and verifying T10 Protection
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* Information.
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*
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* Copyright (C) 2007, 2008, 2014 Oracle Corporation
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* Written by: Martin K. Petersen <martin.petersen@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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*/
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#include <linux/t10-pi.h>
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#include <linux/blkdev.h>
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#include <linux/crc-t10dif.h>
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#include <net/checksum.h>
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typedef __be16 (csum_fn) (void *, unsigned int);
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static const __be16 APP_ESCAPE = (__force __be16) 0xffff;
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static const __be32 REF_ESCAPE = (__force __be32) 0xffffffff;
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static __be16 t10_pi_crc_fn(void *data, unsigned int len)
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{
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return cpu_to_be16(crc_t10dif(data, len));
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}
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static __be16 t10_pi_ip_fn(void *data, unsigned int len)
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{
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return (__force __be16)ip_compute_csum(data, len);
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}
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/*
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* Type 1 and Type 2 protection use the same format: 16 bit guard tag,
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* 16 bit app tag, 32 bit reference tag. Type 3 does not define the ref
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* tag.
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*/
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static int t10_pi_generate(struct blk_integrity_iter *iter, csum_fn *fn,
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unsigned int type)
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{
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unsigned int i;
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for (i = 0 ; i < iter->data_size ; i += iter->interval) {
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struct t10_pi_tuple *pi = iter->prot_buf;
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pi->guard_tag = fn(iter->data_buf, iter->interval);
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pi->app_tag = 0;
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if (type == 1)
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pi->ref_tag = cpu_to_be32(lower_32_bits(iter->seed));
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else
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pi->ref_tag = 0;
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iter->data_buf += iter->interval;
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iter->prot_buf += sizeof(struct t10_pi_tuple);
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iter->seed++;
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}
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return 0;
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}
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static int t10_pi_verify(struct blk_integrity_iter *iter, csum_fn *fn,
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unsigned int type)
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{
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unsigned int i;
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for (i = 0 ; i < iter->data_size ; i += iter->interval) {
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struct t10_pi_tuple *pi = iter->prot_buf;
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__be16 csum;
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switch (type) {
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case 1:
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case 2:
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if (pi->app_tag == APP_ESCAPE)
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goto next;
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if (be32_to_cpu(pi->ref_tag) !=
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lower_32_bits(iter->seed)) {
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pr_err("%s: ref tag error at location %llu " \
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"(rcvd %u)\n", iter->disk_name,
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(unsigned long long)
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iter->seed, be32_to_cpu(pi->ref_tag));
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return -EILSEQ;
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}
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break;
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case 3:
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if (pi->app_tag == APP_ESCAPE &&
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pi->ref_tag == REF_ESCAPE)
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goto next;
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break;
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}
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csum = fn(iter->data_buf, iter->interval);
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if (pi->guard_tag != csum) {
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pr_err("%s: guard tag error at sector %llu " \
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"(rcvd %04x, want %04x)\n", iter->disk_name,
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(unsigned long long)iter->seed,
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be16_to_cpu(pi->guard_tag), be16_to_cpu(csum));
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return -EILSEQ;
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}
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next:
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iter->data_buf += iter->interval;
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iter->prot_buf += sizeof(struct t10_pi_tuple);
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iter->seed++;
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}
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return 0;
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}
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static int t10_pi_type1_generate_crc(struct blk_integrity_iter *iter)
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{
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return t10_pi_generate(iter, t10_pi_crc_fn, 1);
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}
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static int t10_pi_type1_generate_ip(struct blk_integrity_iter *iter)
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{
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return t10_pi_generate(iter, t10_pi_ip_fn, 1);
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}
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static int t10_pi_type1_verify_crc(struct blk_integrity_iter *iter)
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{
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return t10_pi_verify(iter, t10_pi_crc_fn, 1);
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}
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static int t10_pi_type1_verify_ip(struct blk_integrity_iter *iter)
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{
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return t10_pi_verify(iter, t10_pi_ip_fn, 1);
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}
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static int t10_pi_type3_generate_crc(struct blk_integrity_iter *iter)
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{
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return t10_pi_generate(iter, t10_pi_crc_fn, 3);
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}
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static int t10_pi_type3_generate_ip(struct blk_integrity_iter *iter)
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{
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return t10_pi_generate(iter, t10_pi_ip_fn, 3);
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}
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static int t10_pi_type3_verify_crc(struct blk_integrity_iter *iter)
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{
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return t10_pi_verify(iter, t10_pi_crc_fn, 3);
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}
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static int t10_pi_type3_verify_ip(struct blk_integrity_iter *iter)
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{
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return t10_pi_verify(iter, t10_pi_ip_fn, 3);
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}
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struct blk_integrity t10_pi_type1_crc = {
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.name = "T10-DIF-TYPE1-CRC",
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.generate_fn = t10_pi_type1_generate_crc,
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.verify_fn = t10_pi_type1_verify_crc,
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.tuple_size = sizeof(struct t10_pi_tuple),
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.tag_size = 0,
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};
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EXPORT_SYMBOL(t10_pi_type1_crc);
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struct blk_integrity t10_pi_type1_ip = {
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.name = "T10-DIF-TYPE1-IP",
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.generate_fn = t10_pi_type1_generate_ip,
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.verify_fn = t10_pi_type1_verify_ip,
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.tuple_size = sizeof(struct t10_pi_tuple),
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.tag_size = 0,
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};
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EXPORT_SYMBOL(t10_pi_type1_ip);
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struct blk_integrity t10_pi_type3_crc = {
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.name = "T10-DIF-TYPE3-CRC",
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.generate_fn = t10_pi_type3_generate_crc,
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.verify_fn = t10_pi_type3_verify_crc,
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.tuple_size = sizeof(struct t10_pi_tuple),
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.tag_size = 0,
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};
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EXPORT_SYMBOL(t10_pi_type3_crc);
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struct blk_integrity t10_pi_type3_ip = {
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.name = "T10-DIF-TYPE3-IP",
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.generate_fn = t10_pi_type3_generate_ip,
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.verify_fn = t10_pi_type3_verify_ip,
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.tuple_size = sizeof(struct t10_pi_tuple),
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.tag_size = 0,
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};
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EXPORT_SYMBOL(t10_pi_type3_ip);
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