mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Martin K. Petersen](/assets/img/avatar_default.png)
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>
197 lines
5.1 KiB
C
197 lines
5.1 KiB
C
/*
|
|
* 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);
|