forked from Minki/linux
block: add pi for extended integrity
The NVMe specification defines new data integrity formats beyond the t10 tuple. Add support for the specification defined CRC64 formats, assuming the reference tag does not need to be split with the "storage tag". Cc: Hannes Reinecke <hare@suse.de> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Signed-off-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/20220303201312.3255347-8-kbusch@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch
Jens Axboe
parent
f3813f4b28
commit
a7d4383f17
@ -73,6 +73,7 @@ config BLK_DEV_INTEGRITY_T10
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tristate
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depends on BLK_DEV_INTEGRITY
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select CRC_T10DIF
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select CRC64_ROCKSOFT
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config BLK_DEV_ZONED
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bool "Zoned block device support"
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194
block/t10-pi.c
194
block/t10-pi.c
@ -7,8 +7,10 @@
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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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@ -278,4 +280,196 @@ const struct blk_integrity_profile t10_pi_type3_ip = {
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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,
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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 += 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 ext_pi_type1_verify_crc64(struct blk_integrity_iter *iter)
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{
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return ext_pi_crc64_verify(iter, T10_PI_TYPE1_PROTECTION);
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}
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static blk_status_t ext_pi_type1_generate_crc64(struct blk_integrity_iter *iter)
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{
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return ext_pi_crc64_generate(iter, T10_PI_TYPE1_PROTECTION);
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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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const int tuple_sz = rq->q->integrity.tuple_size;
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u64 ref_tag = ext_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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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;
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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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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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u64 ref_tag = ext_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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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;
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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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static blk_status_t ext_pi_type3_verify_crc64(struct blk_integrity_iter *iter)
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{
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return ext_pi_crc64_verify(iter, T10_PI_TYPE3_PROTECTION);
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}
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static blk_status_t ext_pi_type3_generate_crc64(struct blk_integrity_iter *iter)
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{
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return ext_pi_crc64_generate(iter, T10_PI_TYPE3_PROTECTION);
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}
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const struct blk_integrity_profile ext_pi_type1_crc64 = {
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.name = "EXT-DIF-TYPE1-CRC64",
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.generate_fn = ext_pi_type1_generate_crc64,
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.verify_fn = ext_pi_type1_verify_crc64,
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.prepare_fn = ext_pi_type1_prepare,
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.complete_fn = ext_pi_type1_complete,
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};
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EXPORT_SYMBOL_GPL(ext_pi_type1_crc64);
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const struct blk_integrity_profile ext_pi_type3_crc64 = {
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.name = "EXT-DIF-TYPE3-CRC64",
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.generate_fn = ext_pi_type3_generate_crc64,
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.verify_fn = ext_pi_type3_verify_crc64,
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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_GPL(ext_pi_type3_crc64);
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MODULE_LICENSE("GPL");
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MODULE_LICENSE("GPL");
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@ -53,4 +53,24 @@ extern const struct blk_integrity_profile t10_pi_type1_ip;
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extern const struct blk_integrity_profile t10_pi_type3_crc;
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extern const struct blk_integrity_profile t10_pi_type3_ip;
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struct crc64_pi_tuple {
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__be64 guard_tag;
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__be16 app_tag;
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__u8 ref_tag[6];
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};
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static inline u64 ext_pi_ref_tag(struct request *rq)
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{
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unsigned int shift = ilog2(queue_logical_block_size(rq->q));
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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if (rq->q->integrity.interval_exp)
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shift = rq->q->integrity.interval_exp;
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#endif
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return lower_48_bits(blk_rq_pos(rq) >> (shift - SECTOR_SHIFT));
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}
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extern const struct blk_integrity_profile ext_pi_type1_crc64;
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extern const struct blk_integrity_profile ext_pi_type3_crc64;
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#endif
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