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5f60d5f6bb
asm/unaligned.h is always an include of asm-generic/unaligned.h; might as well move that thing to linux/unaligned.h and include that - there's nothing arch-specific in that header. auto-generated by the following: for i in `git grep -l -w asm/unaligned.h`; do sed -i -e "s/asm\/unaligned.h/linux\/unaligned.h/" $i done for i in `git grep -l -w asm-generic/unaligned.h`; do sed -i -e "s/asm-generic\/unaligned.h/linux\/unaligned.h/" $i done git mv include/asm-generic/unaligned.h include/linux/unaligned.h git mv tools/include/asm-generic/unaligned.h tools/include/linux/unaligned.h sed -i -e "/unaligned.h/d" include/asm-generic/Kbuild sed -i -e "s/__ASM_GENERIC/__LINUX/" include/linux/unaligned.h tools/include/linux/unaligned.h
474 lines
12 KiB
C
474 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#include <linux/t10-pi.h>
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#include <linux/blk-integrity.h>
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#include <linux/crc-t10dif.h>
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#include <linux/crc64.h>
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#include <net/checksum.h>
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#include <linux/unaligned.h>
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#include "blk.h"
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struct blk_integrity_iter {
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void *prot_buf;
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void *data_buf;
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sector_t seed;
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unsigned int data_size;
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unsigned short interval;
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const char *disk_name;
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};
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static __be16 t10_pi_csum(__be16 csum, void *data, unsigned int len,
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unsigned char csum_type)
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{
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if (csum_type == BLK_INTEGRITY_CSUM_IP)
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return (__force __be16)ip_compute_csum(data, len);
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return cpu_to_be16(crc_t10dif_update(be16_to_cpu(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 void t10_pi_generate(struct blk_integrity_iter *iter,
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struct blk_integrity *bi)
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{
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u8 offset = bi->pi_offset;
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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 + offset;
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pi->guard_tag = t10_pi_csum(0, iter->data_buf, iter->interval,
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bi->csum_type);
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if (offset)
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pi->guard_tag = t10_pi_csum(pi->guard_tag,
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iter->prot_buf, offset, bi->csum_type);
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pi->app_tag = 0;
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if (bi->flags & BLK_INTEGRITY_REF_TAG)
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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 += bi->tuple_size;
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iter->seed++;
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}
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}
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static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
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struct blk_integrity *bi)
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{
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u8 offset = bi->pi_offset;
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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 + offset;
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__be16 csum;
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if (bi->flags & BLK_INTEGRITY_REF_TAG) {
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if (pi->app_tag == T10_PI_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 BLK_STS_PROTECTION;
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}
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} else {
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if (pi->app_tag == T10_PI_APP_ESCAPE &&
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pi->ref_tag == T10_PI_REF_ESCAPE)
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goto next;
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}
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csum = t10_pi_csum(0, iter->data_buf, iter->interval,
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bi->csum_type);
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if (offset)
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csum = t10_pi_csum(csum, iter->prot_buf, offset,
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bi->csum_type);
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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 BLK_STS_PROTECTION;
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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 += bi->tuple_size;
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iter->seed++;
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}
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return BLK_STS_OK;
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}
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/**
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* t10_pi_type1_prepare - prepare PI prior submitting request to device
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* @rq: request with PI that should be prepared
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*
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* For Type 1/Type 2, the virtual start sector is the one that was
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* originally submitted by the block layer for the ref_tag usage. Due to
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* partitioning, MD/DM cloning, etc. the actual physical start sector is
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* likely to be different. Remap protection information to match the
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* physical LBA.
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*/
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static void t10_pi_type1_prepare(struct request *rq)
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{
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struct blk_integrity *bi = &rq->q->limits.integrity;
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const int tuple_sz = bi->tuple_size;
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u32 ref_tag = t10_pi_ref_tag(rq);
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u8 offset = bi->pi_offset;
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struct bio *bio;
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__rq_for_each_bio(bio, rq) {
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struct bio_integrity_payload *bip = bio_integrity(bio);
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u32 virt = bip_get_seed(bip) & 0xffffffff;
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struct bio_vec iv;
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struct bvec_iter iter;
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/* Already remapped? */
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if (bip->bip_flags & BIP_MAPPED_INTEGRITY)
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break;
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bip_for_each_vec(iv, bip, iter) {
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unsigned int j;
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void *p;
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p = bvec_kmap_local(&iv);
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for (j = 0; j < iv.bv_len; j += tuple_sz) {
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struct t10_pi_tuple *pi = p + offset;
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if (be32_to_cpu(pi->ref_tag) == virt)
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pi->ref_tag = cpu_to_be32(ref_tag);
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virt++;
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ref_tag++;
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p += tuple_sz;
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}
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kunmap_local(p);
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}
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bip->bip_flags |= BIP_MAPPED_INTEGRITY;
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}
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}
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/**
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* t10_pi_type1_complete - prepare PI prior returning request to the blk layer
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* @rq: request with PI that should be prepared
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* @nr_bytes: total bytes to prepare
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*
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* For Type 1/Type 2, the virtual start sector is the one that was
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* originally submitted by the block layer for the ref_tag usage. Due to
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* partitioning, MD/DM cloning, etc. the actual physical start sector is
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* likely to be different. Since the physical start sector was submitted
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* to the device, we should remap it back to virtual values expected by the
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* block layer.
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*/
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static void t10_pi_type1_complete(struct request *rq, unsigned int nr_bytes)
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{
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struct blk_integrity *bi = &rq->q->limits.integrity;
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unsigned intervals = nr_bytes >> bi->interval_exp;
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const int tuple_sz = bi->tuple_size;
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u32 ref_tag = t10_pi_ref_tag(rq);
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u8 offset = bi->pi_offset;
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struct bio *bio;
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__rq_for_each_bio(bio, rq) {
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struct bio_integrity_payload *bip = bio_integrity(bio);
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u32 virt = bip_get_seed(bip) & 0xffffffff;
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struct bio_vec iv;
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struct bvec_iter iter;
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bip_for_each_vec(iv, bip, iter) {
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unsigned int j;
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void *p;
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p = bvec_kmap_local(&iv);
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for (j = 0; j < iv.bv_len && intervals; j += tuple_sz) {
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struct t10_pi_tuple *pi = p + offset;
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if (be32_to_cpu(pi->ref_tag) == ref_tag)
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pi->ref_tag = cpu_to_be32(virt);
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virt++;
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ref_tag++;
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intervals--;
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p += tuple_sz;
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}
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kunmap_local(p);
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}
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}
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}
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static __be64 ext_pi_crc64(u64 crc, void *data, unsigned int len)
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{
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return cpu_to_be64(crc64_rocksoft_update(crc, data, len));
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}
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static void ext_pi_crc64_generate(struct blk_integrity_iter *iter,
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struct blk_integrity *bi)
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{
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u8 offset = bi->pi_offset;
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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 crc64_pi_tuple *pi = iter->prot_buf + offset;
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pi->guard_tag = ext_pi_crc64(0, iter->data_buf, iter->interval);
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if (offset)
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pi->guard_tag = ext_pi_crc64(be64_to_cpu(pi->guard_tag),
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iter->prot_buf, offset);
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pi->app_tag = 0;
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if (bi->flags & BLK_INTEGRITY_REF_TAG)
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put_unaligned_be48(iter->seed, pi->ref_tag);
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else
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put_unaligned_be48(0ULL, pi->ref_tag);
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iter->data_buf += iter->interval;
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iter->prot_buf += bi->tuple_size;
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iter->seed++;
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}
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}
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static bool ext_pi_ref_escape(const u8 ref_tag[6])
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{
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static const u8 ref_escape[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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return memcmp(ref_tag, ref_escape, sizeof(ref_escape)) == 0;
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}
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static blk_status_t ext_pi_crc64_verify(struct blk_integrity_iter *iter,
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struct blk_integrity *bi)
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{
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u8 offset = bi->pi_offset;
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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 crc64_pi_tuple *pi = iter->prot_buf + offset;
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u64 ref, seed;
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__be64 csum;
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if (bi->flags & BLK_INTEGRITY_REF_TAG) {
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if (pi->app_tag == T10_PI_APP_ESCAPE)
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goto next;
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ref = get_unaligned_be48(pi->ref_tag);
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seed = lower_48_bits(iter->seed);
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if (ref != seed) {
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pr_err("%s: ref tag error at location %llu (rcvd %llu)\n",
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iter->disk_name, seed, ref);
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return BLK_STS_PROTECTION;
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}
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} else {
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if (pi->app_tag == T10_PI_APP_ESCAPE &&
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ext_pi_ref_escape(pi->ref_tag))
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goto next;
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}
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csum = ext_pi_crc64(0, iter->data_buf, iter->interval);
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if (offset)
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csum = ext_pi_crc64(be64_to_cpu(csum), iter->prot_buf,
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offset);
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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 %016llx, want %016llx)\n",
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iter->disk_name, (unsigned long long)iter->seed,
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be64_to_cpu(pi->guard_tag), be64_to_cpu(csum));
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return BLK_STS_PROTECTION;
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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 += bi->tuple_size;
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iter->seed++;
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}
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return BLK_STS_OK;
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}
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static void ext_pi_type1_prepare(struct request *rq)
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{
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struct blk_integrity *bi = &rq->q->limits.integrity;
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const int tuple_sz = bi->tuple_size;
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u64 ref_tag = ext_pi_ref_tag(rq);
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u8 offset = bi->pi_offset;
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struct bio *bio;
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__rq_for_each_bio(bio, rq) {
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struct bio_integrity_payload *bip = bio_integrity(bio);
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u64 virt = lower_48_bits(bip_get_seed(bip));
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struct bio_vec iv;
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struct bvec_iter iter;
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/* Already remapped? */
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if (bip->bip_flags & BIP_MAPPED_INTEGRITY)
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break;
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bip_for_each_vec(iv, bip, iter) {
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unsigned int j;
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void *p;
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p = bvec_kmap_local(&iv);
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for (j = 0; j < iv.bv_len; j += tuple_sz) {
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struct crc64_pi_tuple *pi = p + offset;
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u64 ref = get_unaligned_be48(pi->ref_tag);
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if (ref == virt)
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put_unaligned_be48(ref_tag, pi->ref_tag);
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virt++;
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ref_tag++;
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p += tuple_sz;
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}
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kunmap_local(p);
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}
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bip->bip_flags |= BIP_MAPPED_INTEGRITY;
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}
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}
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static void ext_pi_type1_complete(struct request *rq, unsigned int nr_bytes)
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{
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struct blk_integrity *bi = &rq->q->limits.integrity;
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unsigned intervals = nr_bytes >> bi->interval_exp;
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const int tuple_sz = bi->tuple_size;
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u64 ref_tag = ext_pi_ref_tag(rq);
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u8 offset = bi->pi_offset;
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struct bio *bio;
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__rq_for_each_bio(bio, rq) {
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struct bio_integrity_payload *bip = bio_integrity(bio);
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u64 virt = lower_48_bits(bip_get_seed(bip));
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struct bio_vec iv;
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struct bvec_iter iter;
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bip_for_each_vec(iv, bip, iter) {
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unsigned int j;
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void *p;
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p = bvec_kmap_local(&iv);
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for (j = 0; j < iv.bv_len && intervals; j += tuple_sz) {
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struct crc64_pi_tuple *pi = p + offset;
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u64 ref = get_unaligned_be48(pi->ref_tag);
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if (ref == ref_tag)
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put_unaligned_be48(virt, pi->ref_tag);
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virt++;
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ref_tag++;
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intervals--;
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p += tuple_sz;
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}
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kunmap_local(p);
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}
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}
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}
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void blk_integrity_generate(struct bio *bio)
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{
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struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct blk_integrity_iter iter;
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struct bvec_iter bviter;
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struct bio_vec bv;
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iter.disk_name = bio->bi_bdev->bd_disk->disk_name;
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iter.interval = 1 << bi->interval_exp;
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iter.seed = bio->bi_iter.bi_sector;
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iter.prot_buf = bvec_virt(bip->bip_vec);
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bio_for_each_segment(bv, bio, bviter) {
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void *kaddr = bvec_kmap_local(&bv);
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iter.data_buf = kaddr;
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iter.data_size = bv.bv_len;
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switch (bi->csum_type) {
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case BLK_INTEGRITY_CSUM_CRC64:
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ext_pi_crc64_generate(&iter, bi);
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break;
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case BLK_INTEGRITY_CSUM_CRC:
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case BLK_INTEGRITY_CSUM_IP:
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t10_pi_generate(&iter, bi);
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break;
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default:
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break;
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}
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kunmap_local(kaddr);
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}
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}
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void blk_integrity_verify(struct bio *bio)
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{
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struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct blk_integrity_iter iter;
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struct bvec_iter bviter;
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struct bio_vec bv;
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/*
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* At the moment verify is called bi_iter has been advanced during split
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* and completion, so use the copy created during submission here.
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*/
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iter.disk_name = bio->bi_bdev->bd_disk->disk_name;
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iter.interval = 1 << bi->interval_exp;
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iter.seed = bip->bio_iter.bi_sector;
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iter.prot_buf = bvec_virt(bip->bip_vec);
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__bio_for_each_segment(bv, bio, bviter, bip->bio_iter) {
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void *kaddr = bvec_kmap_local(&bv);
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blk_status_t ret = BLK_STS_OK;
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iter.data_buf = kaddr;
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iter.data_size = bv.bv_len;
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switch (bi->csum_type) {
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case BLK_INTEGRITY_CSUM_CRC64:
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ret = ext_pi_crc64_verify(&iter, bi);
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break;
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case BLK_INTEGRITY_CSUM_CRC:
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case BLK_INTEGRITY_CSUM_IP:
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ret = t10_pi_verify(&iter, bi);
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break;
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default:
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break;
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}
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kunmap_local(kaddr);
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if (ret) {
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bio->bi_status = ret;
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return;
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}
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}
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}
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void blk_integrity_prepare(struct request *rq)
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{
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struct blk_integrity *bi = &rq->q->limits.integrity;
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if (!(bi->flags & BLK_INTEGRITY_REF_TAG))
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return;
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if (bi->csum_type == BLK_INTEGRITY_CSUM_CRC64)
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ext_pi_type1_prepare(rq);
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else
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t10_pi_type1_prepare(rq);
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}
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void blk_integrity_complete(struct request *rq, unsigned int nr_bytes)
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{
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struct blk_integrity *bi = &rq->q->limits.integrity;
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if (!(bi->flags & BLK_INTEGRITY_REF_TAG))
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return;
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if (bi->csum_type == BLK_INTEGRITY_CSUM_CRC64)
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ext_pi_type1_complete(rq, nr_bytes);
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else
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t10_pi_type1_complete(rq, nr_bytes);
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}
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