476 lines
12 KiB
C
476 lines
12 KiB
C
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// 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 <linux/module.h>
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#include <net/checksum.h>
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#include <asm/unaligned.h>
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typedef __be16 (csum_fn) (void *, unsigned int);
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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 blk_status_t t10_pi_generate(struct blk_integrity_iter *iter,
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csum_fn *fn, enum t10_dif_type 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 == T10_PI_TYPE1_PROTECTION)
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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 += iter->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 blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
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csum_fn *fn, enum t10_dif_type type)
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{
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unsigned int i;
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BUG_ON(type == T10_PI_TYPE0_PROTECTION);
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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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if (type == T10_PI_TYPE1_PROTECTION ||
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type == T10_PI_TYPE2_PROTECTION) {
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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 if (type == T10_PI_TYPE3_PROTECTION) {
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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 = 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 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 += iter->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 blk_status_t 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, T10_PI_TYPE1_PROTECTION);
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}
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static blk_status_t 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, T10_PI_TYPE1_PROTECTION);
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}
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static blk_status_t 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, T10_PI_TYPE1_PROTECTION);
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}
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static blk_status_t 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, T10_PI_TYPE1_PROTECTION);
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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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const int tuple_sz = rq->q->integrity.tuple_size;
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u32 ref_tag = t10_pi_ref_tag(rq);
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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;
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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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unsigned intervals = nr_bytes >> rq->q->integrity.interval_exp;
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const int tuple_sz = rq->q->integrity.tuple_size;
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u32 ref_tag = t10_pi_ref_tag(rq);
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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;
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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 blk_status_t 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, T10_PI_TYPE3_PROTECTION);
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}
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static blk_status_t 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, T10_PI_TYPE3_PROTECTION);
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}
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static blk_status_t 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, T10_PI_TYPE3_PROTECTION);
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}
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static blk_status_t 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, T10_PI_TYPE3_PROTECTION);
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}
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/* Type 3 does not have a reference tag so no remapping is required. */
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static void t10_pi_type3_prepare(struct request *rq)
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{
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}
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/* Type 3 does not have a reference tag so no remapping is required. */
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static void t10_pi_type3_complete(struct request *rq, unsigned int nr_bytes)
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{
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}
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const struct blk_integrity_profile 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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.prepare_fn = t10_pi_type1_prepare,
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.complete_fn = t10_pi_type1_complete,
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};
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EXPORT_SYMBOL(t10_pi_type1_crc);
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const struct blk_integrity_profile 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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.prepare_fn = t10_pi_type1_prepare,
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.complete_fn = t10_pi_type1_complete,
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};
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EXPORT_SYMBOL(t10_pi_type1_ip);
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const struct blk_integrity_profile 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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.prepare_fn = t10_pi_type3_prepare,
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.complete_fn = t10_pi_type3_complete,
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};
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EXPORT_SYMBOL(t10_pi_type3_crc);
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const struct blk_integrity_profile 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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.prepare_fn = t10_pi_type3_prepare,
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.complete_fn = t10_pi_type3_complete,
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};
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EXPORT_SYMBOL(t10_pi_type3_ip);
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static __be64 ext_pi_crc64(void *data, unsigned int len)
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{
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return cpu_to_be64(crc64_rocksoft(data, len));
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}
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static blk_status_t ext_pi_crc64_generate(struct blk_integrity_iter *iter,
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enum t10_dif_type 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 crc64_pi_tuple *pi = iter->prot_buf;
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pi->guard_tag = ext_pi_crc64(iter->data_buf, iter->interval);
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pi->app_tag = 0;
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if (type == T10_PI_TYPE1_PROTECTION)
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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 += iter->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 bool ext_pi_ref_escape(u8 *ref_tag)
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{
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static 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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enum t10_dif_type 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 crc64_pi_tuple *pi = iter->prot_buf;
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u64 ref, seed;
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__be64 csum;
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if (type == T10_PI_TYPE1_PROTECTION) {
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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 if (type == T10_PI_TYPE3_PROTECTION) {
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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(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 %016llx, want %016llx)\n",
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||
|
|
iter->disk_name, (unsigned long long)iter->seed,
|
||
|
|
be64_to_cpu(pi->guard_tag), be64_to_cpu(csum));
|
||
|
|
return BLK_STS_PROTECTION;
|
||
|
|
}
|
||
|
|
|
||
|
|
next:
|
||
|
|
iter->data_buf += iter->interval;
|
||
|
|
iter->prot_buf += iter->tuple_size;
|
||
|
|
iter->seed++;
|
||
|
|
}
|
||
|
|
|
||
|
|
return BLK_STS_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
static blk_status_t ext_pi_type1_verify_crc64(struct blk_integrity_iter *iter)
|
||
|
|
{
|
||
|
|
return ext_pi_crc64_verify(iter, T10_PI_TYPE1_PROTECTION);
|
||
|
|
}
|
||
|
|
|
||
|
|
static blk_status_t ext_pi_type1_generate_crc64(struct blk_integrity_iter *iter)
|
||
|
|
{
|
||
|
|
return ext_pi_crc64_generate(iter, T10_PI_TYPE1_PROTECTION);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ext_pi_type1_prepare(struct request *rq)
|
||
|
|
{
|
||
|
|
const int tuple_sz = rq->q->integrity.tuple_size;
|
||
|
|
u64 ref_tag = ext_pi_ref_tag(rq);
|
||
|
|
struct bio *bio;
|
||
|
|
|
||
|
|
__rq_for_each_bio(bio, rq) {
|
||
|
|
struct bio_integrity_payload *bip = bio_integrity(bio);
|
||
|
|
u64 virt = lower_48_bits(bip_get_seed(bip));
|
||
|
|
struct bio_vec iv;
|
||
|
|
struct bvec_iter iter;
|
||
|
|
|
||
|
|
/* Already remapped? */
|
||
|
|
if (bip->bip_flags & BIP_MAPPED_INTEGRITY)
|
||
|
|
break;
|
||
|
|
|
||
|
|
bip_for_each_vec(iv, bip, iter) {
|
||
|
|
unsigned int j;
|
||
|
|
void *p;
|
||
|
|
|
||
|
|
p = bvec_kmap_local(&iv);
|
||
|
|
for (j = 0; j < iv.bv_len; j += tuple_sz) {
|
||
|
|
struct crc64_pi_tuple *pi = p;
|
||
|
|
u64 ref = get_unaligned_be48(pi->ref_tag);
|
||
|
|
|
||
|
|
if (ref == virt)
|
||
|
|
put_unaligned_be48(ref_tag, pi->ref_tag);
|
||
|
|
virt++;
|
||
|
|
ref_tag++;
|
||
|
|
p += tuple_sz;
|
||
|
|
}
|
||
|
|
kunmap_local(p);
|
||
|
|
}
|
||
|
|
|
||
|
|
bip->bip_flags |= BIP_MAPPED_INTEGRITY;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ext_pi_type1_complete(struct request *rq, unsigned int nr_bytes)
|
||
|
|
{
|
||
|
|
unsigned intervals = nr_bytes >> rq->q->integrity.interval_exp;
|
||
|
|
const int tuple_sz = rq->q->integrity.tuple_size;
|
||
|
|
u64 ref_tag = ext_pi_ref_tag(rq);
|
||
|
|
struct bio *bio;
|
||
|
|
|
||
|
|
__rq_for_each_bio(bio, rq) {
|
||
|
|
struct bio_integrity_payload *bip = bio_integrity(bio);
|
||
|
|
u64 virt = lower_48_bits(bip_get_seed(bip));
|
||
|
|
struct bio_vec iv;
|
||
|
|
struct bvec_iter iter;
|
||
|
|
|
||
|
|
bip_for_each_vec(iv, bip, iter) {
|
||
|
|
unsigned int j;
|
||
|
|
void *p;
|
||
|
|
|
||
|
|
p = bvec_kmap_local(&iv);
|
||
|
|
for (j = 0; j < iv.bv_len && intervals; j += tuple_sz) {
|
||
|
|
struct crc64_pi_tuple *pi = p;
|
||
|
|
u64 ref = get_unaligned_be48(pi->ref_tag);
|
||
|
|
|
||
|
|
if (ref == ref_tag)
|
||
|
|
put_unaligned_be48(virt, pi->ref_tag);
|
||
|
|
virt++;
|
||
|
|
ref_tag++;
|
||
|
|
intervals--;
|
||
|
|
p += tuple_sz;
|
||
|
|
}
|
||
|
|
kunmap_local(p);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static blk_status_t ext_pi_type3_verify_crc64(struct blk_integrity_iter *iter)
|
||
|
|
{
|
||
|
|
return ext_pi_crc64_verify(iter, T10_PI_TYPE3_PROTECTION);
|
||
|
|
}
|
||
|
|
|
||
|
|
static blk_status_t ext_pi_type3_generate_crc64(struct blk_integrity_iter *iter)
|
||
|
|
{
|
||
|
|
return ext_pi_crc64_generate(iter, T10_PI_TYPE3_PROTECTION);
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct blk_integrity_profile ext_pi_type1_crc64 = {
|
||
|
|
.name = "EXT-DIF-TYPE1-CRC64",
|
||
|
|
.generate_fn = ext_pi_type1_generate_crc64,
|
||
|
|
.verify_fn = ext_pi_type1_verify_crc64,
|
||
|
|
.prepare_fn = ext_pi_type1_prepare,
|
||
|
|
.complete_fn = ext_pi_type1_complete,
|
||
|
|
};
|
||
|
|
EXPORT_SYMBOL_GPL(ext_pi_type1_crc64);
|
||
|
|
|
||
|
|
const struct blk_integrity_profile ext_pi_type3_crc64 = {
|
||
|
|
.name = "EXT-DIF-TYPE3-CRC64",
|
||
|
|
.generate_fn = ext_pi_type3_generate_crc64,
|
||
|
|
.verify_fn = ext_pi_type3_verify_crc64,
|
||
|
|
.prepare_fn = t10_pi_type3_prepare,
|
||
|
|
.complete_fn = t10_pi_type3_complete,
|
||
|
|
};
|
||
|
|
EXPORT_SYMBOL_GPL(ext_pi_type3_crc64);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_LICENSE("GPL");
|