1 files changed, 208 insertions, 19 deletions

diff --git a/block/t10-pi.c b/block/t10-pi.c
index 9803c7e0376e..914d8cddd43a 100644
--- a/block/t10-pi.c
+++ b/block/t10-pi.c
@@ -5,9 +5,12 @@
  */
 
 #include <linux/t10-pi.h>
-#include <linux/blkdev.h>
+#include <linux/blk-integrity.h>
 #include <linux/crc-t10dif.h>
+#include <linux/crc64.h>
+#include <linux/module.h>
 #include <net/checksum.h>
+#include <asm/unaligned.h>
 
 typedef __be16 (csum_fn) (void *, unsigned int);
 
@@ -43,7 +46,7 @@ static blk_status_t t10_pi_generate(struct blk_integrity_iter *iter,
 			pi->ref_tag = 0;
 
 		iter->data_buf += iter->interval;
-		iter->prot_buf += sizeof(struct t10_pi_tuple);
+		iter->prot_buf += iter->tuple_size;
 		iter->seed++;
 	}
 
@@ -92,7 +95,7 @@ static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
 
 next:
 		iter->data_buf += iter->interval;
-		iter->prot_buf += sizeof(struct t10_pi_tuple);
+		iter->prot_buf += iter->tuple_size;
 		iter->seed++;
 	}
 
@@ -146,11 +149,10 @@ static void t10_pi_type1_prepare(struct request *rq)
 			break;
 
 		bip_for_each_vec(iv, bip, iter) {
-			void *p, *pmap;
 			unsigned int j;
+			void *p;
 
-			pmap = kmap_atomic(iv.bv_page);
-			p = pmap + iv.bv_offset;
+			p = bvec_kmap_local(&iv);
 			for (j = 0; j < iv.bv_len; j += tuple_sz) {
 				struct t10_pi_tuple *pi = p;
 
@@ -160,8 +162,7 @@ static void t10_pi_type1_prepare(struct request *rq)
 				ref_tag++;
 				p += tuple_sz;
 			}
-
-			kunmap_atomic(pmap);
+			kunmap_local(p);
 		}
 
 		bip->bip_flags |= BIP_MAPPED_INTEGRITY;
@@ -194,11 +195,10 @@ static void t10_pi_type1_complete(struct request *rq, unsigned int nr_bytes)
 		struct bvec_iter iter;
 
 		bip_for_each_vec(iv, bip, iter) {
-			void *p, *pmap;
 			unsigned int j;
+			void *p;
 
-			pmap = kmap_atomic(iv.bv_page);
-			p = pmap + iv.bv_offset;
+			p = bvec_kmap_local(&iv);
 			for (j = 0; j < iv.bv_len && intervals; j += tuple_sz) {
 				struct t10_pi_tuple *pi = p;
 
@@ -209,8 +209,7 @@ static void t10_pi_type1_complete(struct request *rq, unsigned int nr_bytes)
 				intervals--;
 				p += tuple_sz;
 			}
-
-			kunmap_atomic(pmap);
+			kunmap_local(p);
 		}
 	}
 }
@@ -235,16 +234,12 @@ static blk_status_t t10_pi_type3_verify_ip(struct blk_integrity_iter *iter)
 	return t10_pi_verify(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION);
 }
 
-/**
- * Type 3 does not have a reference tag so no remapping is required.
- */
+/* Type 3 does not have a reference tag so no remapping is required. */
 static void t10_pi_type3_prepare(struct request *rq)
 {
 }
 
-/**
- * Type 3 does not have a reference tag so no remapping is required.
- */
+/* Type 3 does not have a reference tag so no remapping is required. */
 static void t10_pi_type3_complete(struct request *rq, unsigned int nr_bytes)
 {
 }
@@ -284,3 +279,197 @@ const struct blk_integrity_profile t10_pi_type3_ip = {
 	.complete_fn		= t10_pi_type3_complete,
 };
 EXPORT_SYMBOL(t10_pi_type3_ip);
+
+static __be64 ext_pi_crc64(void *data, unsigned int len)
+{
+	return cpu_to_be64(crc64_rocksoft(data, len));
+}
+
+static blk_status_t ext_pi_crc64_generate(struct blk_integrity_iter *iter,
+					enum t10_dif_type type)
+{
+	unsigned int i;
+
+	for (i = 0 ; i < iter->data_size ; i += iter->interval) {
+		struct crc64_pi_tuple *pi = iter->prot_buf;
+
+		pi->guard_tag = ext_pi_crc64(iter->data_buf, iter->interval);
+		pi->app_tag = 0;
+
+		if (type == T10_PI_TYPE1_PROTECTION)
+			put_unaligned_be48(iter->seed, pi->ref_tag);
+		else
+			put_unaligned_be48(0ULL, pi->ref_tag);
+
+		iter->data_buf += iter->interval;
+		iter->prot_buf += iter->tuple_size;
+		iter->seed++;
+	}
+
+	return BLK_STS_OK;
+}
+
+static bool ext_pi_ref_escape(u8 *ref_tag)
+{
+	static u8 ref_escape[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+	return memcmp(ref_tag, ref_escape, sizeof(ref_escape)) == 0;
+}
+
+static blk_status_t ext_pi_crc64_verify(struct blk_integrity_iter *iter,
+				      enum t10_dif_type type)
+{
+	unsigned int i;
+
+	for (i = 0; i < iter->data_size; i += iter->interval) {
+		struct crc64_pi_tuple *pi = iter->prot_buf;
+		u64 ref, seed;
+		__be64 csum;
+
+		if (type == T10_PI_TYPE1_PROTECTION) {
+			if (pi->app_tag == T10_PI_APP_ESCAPE)
+				goto next;
+
+			ref = get_unaligned_be48(pi->ref_tag);
+			seed = lower_48_bits(iter->seed);
+			if (ref != seed) {
+				pr_err("%s: ref tag error at location %llu (rcvd %llu)\n",
+					iter->disk_name, seed, ref);
+				return BLK_STS_PROTECTION;
+			}
+		} else if (type == T10_PI_TYPE3_PROTECTION) {
+			if (pi->app_tag == T10_PI_APP_ESCAPE &&
+			    ext_pi_ref_escape(pi->ref_tag))
+				goto next;
+		}
+
+		csum = ext_pi_crc64(iter->data_buf, iter->interval);
+		if (pi->guard_tag != csum) {
+			pr_err("%s: guard tag error at sector %llu " \
+			       "(rcvd %016llx, want %016llx)\n",
+				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");