[PATCH v5 1/2] block: use symbolic constants for t10_pi type

[PATCH v5 1/2] block: use symbolic constants for t10_pi type

[Max Gurtovoy]

Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
---
 block/t10-pi.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/block/t10-pi.c b/block/t10-pi.c
index 0c00946..7fed587 100644
--- a/block/t10-pi.c
+++ b/block/t10-pi.c
@@ -27,7 +27,7 @@ static __be16 t10_pi_ip_fn(void *data, unsigned int len)
  * tag.
  */
 static blk_status_t t10_pi_generate(struct blk_integrity_iter *iter,
-		csum_fn *fn, unsigned int type)
+		csum_fn *fn, enum t10_dif_type type)
 {
 	unsigned int i;
 
@@ -37,7 +37,7 @@ static blk_status_t t10_pi_generate(struct blk_integrity_iter *iter,
 		pi->guard_tag = fn(iter->data_buf, iter->interval);
 		pi->app_tag = 0;
 
-		if (type == 1)
+		if (type == T10_PI_TYPE1_PROTECTION)
 			pi->ref_tag = cpu_to_be32(lower_32_bits(iter->seed));
 		else
 			pi->ref_tag = 0;
@@ -51,7 +51,7 @@ static blk_status_t t10_pi_generate(struct blk_integrity_iter *iter,
 }
 
 static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
-		csum_fn *fn, unsigned int type)
+		csum_fn *fn, enum t10_dif_type type)
 {
 	unsigned int i;
 
@@ -60,8 +60,8 @@ static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
 		__be16 csum;
 
 		switch (type) {
-		case 1:
-		case 2:
+		case T10_PI_TYPE1_PROTECTION:
+		case T10_PI_TYPE2_PROTECTION:
 			if (pi->app_tag == T10_PI_APP_ESCAPE)
 				goto next;
 
@@ -74,7 +74,7 @@ static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
 				return BLK_STS_PROTECTION;
 			}
 			break;
-		case 3:
+		case T10_PI_TYPE3_PROTECTION:
 			if (pi->app_tag == T10_PI_APP_ESCAPE &&
 			    pi->ref_tag == T10_PI_REF_ESCAPE)
 				goto next;
@@ -102,42 +102,42 @@ static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
 
 static blk_status_t t10_pi_type1_generate_crc(struct blk_integrity_iter *iter)
 {
-	return t10_pi_generate(iter, t10_pi_crc_fn, 1);
+	return t10_pi_generate(iter, t10_pi_crc_fn, T10_PI_TYPE1_PROTECTION);
 }
 
 static blk_status_t t10_pi_type1_generate_ip(struct blk_integrity_iter *iter)
 {
-	return t10_pi_generate(iter, t10_pi_ip_fn, 1);
+	return t10_pi_generate(iter, t10_pi_ip_fn, T10_PI_TYPE1_PROTECTION);
 }
 
 static blk_status_t t10_pi_type1_verify_crc(struct blk_integrity_iter *iter)
 {
-	return t10_pi_verify(iter, t10_pi_crc_fn, 1);
+	return t10_pi_verify(iter, t10_pi_crc_fn, T10_PI_TYPE1_PROTECTION);
 }
 
 static blk_status_t t10_pi_type1_verify_ip(struct blk_integrity_iter *iter)
 {
-	return t10_pi_verify(iter, t10_pi_ip_fn, 1);
+	return t10_pi_verify(iter, t10_pi_ip_fn, T10_PI_TYPE1_PROTECTION);
 }
 
 static blk_status_t t10_pi_type3_generate_crc(struct blk_integrity_iter *iter)
 {
-	return t10_pi_generate(iter, t10_pi_crc_fn, 3);
+	return t10_pi_generate(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION);
 }
 
 static blk_status_t t10_pi_type3_generate_ip(struct blk_integrity_iter *iter)
 {
-	return t10_pi_generate(iter, t10_pi_ip_fn, 3);
+	return t10_pi_generate(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION);
 }
 
 static blk_status_t t10_pi_type3_verify_crc(struct blk_integrity_iter *iter)
 {
-	return t10_pi_verify(iter, t10_pi_crc_fn, 3);
+	return t10_pi_verify(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION);
 }
 
 static blk_status_t t10_pi_type3_verify_ip(struct blk_integrity_iter *iter)
 {
-	return t10_pi_verify(iter, t10_pi_ip_fn, 3);
+	return t10_pi_verify(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION);
 }
 
 const struct blk_integrity_profile t10_pi_type1_crc = {
-- 
1.8.3.1


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[PATCH v5 2/2] block: centralize PI remapping logic to the block layer

[Max Gurtovoy]

Currently t10_pi_prepare/t10_pi_complete functions are called during the
NVMe and SCSi layers command preparetion/completion, but their actual
place should be the block layer since T10-PI is a general data integrity
feature that is used by block storage protocols. Introduce .prepare_fn
and .complete_fn callbacks within the integrity profile that each type
can implement according to its needs.

Suggested-by: Christoph Hellwig <hch@lst.de>
Suggested-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
---

changes from v4:
 - added .prepare_fn and .complete_fn callbacks
 - removed patches 2/3 and 3/3 from v4

changes from v3:
 - fix > 80 liner
 - move the protection_type assignment into nvme_update_disk_info
 - added a comment regarding dps and DIF type values
 - drop redundant externs from t10-pi.h

changes from v2:
 - remove local variable for protection_type
 - remove remapping between NVMe T10 definition to blk definition
 - added patches 2/3 and 3/3
 - remove pi_type from ns structure

changes from v1:
 - seperate from nvme_cleanup command patches
 - introduce blk_integrity_interval_shift to avoid div in fast path

---
 block/blk-core.c          |   6 ++
 block/blk-integrity.c     |  11 ++++
 block/blk-mq.c            |   5 ++
 block/t10-pi.c            | 144 ++++++++++++++++++++++++----------------------
 drivers/md/dm-integrity.c |  10 ++++
 drivers/nvme/host/core.c  |   9 ---
 drivers/scsi/sd.c         |   8 ---
 include/linux/blkdev.h    |   4 ++
 include/linux/t10-pi.h    |  14 -----
 9 files changed, 112 insertions(+), 99 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index d0cc6e1..318271a4 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -34,6 +34,7 @@
 #include <linux/ratelimit.h>
 #include <linux/pm_runtime.h>
 #include <linux/blk-cgroup.h>
+#include <linux/t10-pi.h>
 #include <linux/debugfs.h>
 #include <linux/bpf.h>
 
@@ -1405,6 +1406,11 @@ bool blk_update_request(struct request *req, blk_status_t error,
 	if (!req->bio)
 		return false;
 
+	if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ &&
+	    error == BLK_STS_OK)
+		req->q->integrity.profile->complete_fn(req, nr_bytes);
+
+
 	if (unlikely(error && !blk_rq_is_passthrough(req) &&
 		     !(req->rq_flags & RQF_QUIET)))
 		print_req_error(req, error, __func__);
diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index ca39b46..ff1070e 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -368,10 +368,21 @@ static blk_status_t blk_integrity_nop_fn(struct blk_integrity_iter *iter)
 	return BLK_STS_OK;
 }
 
+static void blk_integrity_nop_prepare(struct request *rq)
+{
+}
+
+static void blk_integrity_nop_complete(struct request *rq,
+		unsigned int nr_bytes)
+{
+}
+
 static const struct blk_integrity_profile nop_profile = {
 	.name = "nop",
 	.generate_fn = blk_integrity_nop_fn,
 	.verify_fn = blk_integrity_nop_fn,
+	.prepare_fn = blk_integrity_nop_prepare,
+	.complete_fn = blk_integrity_nop_complete,
 };
 
 /**
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 0835f4d..259a348 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -30,6 +30,7 @@
 #include <trace/events/block.h>
 
 #include <linux/blk-mq.h>
+#include <linux/t10-pi.h>
 #include "blk.h"
 #include "blk-mq.h"
 #include "blk-mq-debugfs.h"
@@ -693,6 +694,10 @@ void blk_mq_start_request(struct request *rq)
 		 */
 		rq->nr_phys_segments++;
 	}
+
+	if (blk_integrity_rq(rq) && req_op(rq) == REQ_OP_WRITE)
+		rq->q->integrity.profile->prepare_fn(rq);
+
 }
 EXPORT_SYMBOL(blk_mq_start_request);
 
diff --git a/block/t10-pi.c b/block/t10-pi.c
index 7fed587..0c0120a 100644
--- a/block/t10-pi.c
+++ b/block/t10-pi.c
@@ -120,76 +120,22 @@ static blk_status_t t10_pi_type1_verify_ip(struct blk_integrity_iter *iter)
 	return t10_pi_verify(iter, t10_pi_ip_fn, T10_PI_TYPE1_PROTECTION);
 }
 
-static blk_status_t t10_pi_type3_generate_crc(struct blk_integrity_iter *iter)
-{
-	return t10_pi_generate(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION);
-}
-
-static blk_status_t t10_pi_type3_generate_ip(struct blk_integrity_iter *iter)
-{
-	return t10_pi_generate(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION);
-}
-
-static blk_status_t t10_pi_type3_verify_crc(struct blk_integrity_iter *iter)
-{
-	return t10_pi_verify(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION);
-}
-
-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);
-}
-
-const struct blk_integrity_profile t10_pi_type1_crc = {
-	.name			= "T10-DIF-TYPE1-CRC",
-	.generate_fn		= t10_pi_type1_generate_crc,
-	.verify_fn		= t10_pi_type1_verify_crc,
-};
-EXPORT_SYMBOL(t10_pi_type1_crc);
-
-const struct blk_integrity_profile t10_pi_type1_ip = {
-	.name			= "T10-DIF-TYPE1-IP",
-	.generate_fn		= t10_pi_type1_generate_ip,
-	.verify_fn		= t10_pi_type1_verify_ip,
-};
-EXPORT_SYMBOL(t10_pi_type1_ip);
-
-const struct blk_integrity_profile t10_pi_type3_crc = {
-	.name			= "T10-DIF-TYPE3-CRC",
-	.generate_fn		= t10_pi_type3_generate_crc,
-	.verify_fn		= t10_pi_type3_verify_crc,
-};
-EXPORT_SYMBOL(t10_pi_type3_crc);
-
-const struct blk_integrity_profile t10_pi_type3_ip = {
-	.name			= "T10-DIF-TYPE3-IP",
-	.generate_fn		= t10_pi_type3_generate_ip,
-	.verify_fn		= t10_pi_type3_verify_ip,
-};
-EXPORT_SYMBOL(t10_pi_type3_ip);
-
 /**
- * t10_pi_prepare - prepare PI prior submitting request to device
+ * t10_pi_type1_prepare - prepare PI prior submitting request to device
  * @rq:              request with PI that should be prepared
- * @protection_type: PI type (Type 1/Type 2/Type 3)
  *
  * For Type 1/Type 2, the virtual start sector is the one that was
  * originally submitted by the block layer for the ref_tag usage. Due to
  * partitioning, MD/DM cloning, etc. the actual physical start sector is
  * likely to be different. Remap protection information to match the
  * physical LBA.
- *
- * Type 3 does not have a reference tag so no remapping is required.
  */
-void t10_pi_prepare(struct request *rq, u8 protection_type)
+static void t10_pi_type1_prepare(struct request *rq)
 {
 	const int tuple_sz = rq->q->integrity.tuple_size;
 	u32 ref_tag = t10_pi_ref_tag(rq);
 	struct bio *bio;
 
-	if (protection_type == T10_PI_TYPE3_PROTECTION)
-		return;
-
 	__rq_for_each_bio(bio, rq) {
 		struct bio_integrity_payload *bip = bio_integrity(bio);
 		u32 virt = bip_get_seed(bip) & 0xffffffff;
@@ -222,13 +168,11 @@ void t10_pi_prepare(struct request *rq, u8 protection_type)
 		bip->bip_flags |= BIP_MAPPED_INTEGRITY;
 	}
 }
-EXPORT_SYMBOL(t10_pi_prepare);
 
 /**
- * t10_pi_complete - prepare PI prior returning request to the block layer
+ * t10_pi_type1_complete - prepare PI prior returning request to the blk layer
  * @rq:              request with PI that should be prepared
- * @protection_type: PI type (Type 1/Type 2/Type 3)
- * @intervals:       total elements to prepare
+ * @nr_bytes:        total bytes to prepare
  *
  * For Type 1/Type 2, the virtual start sector is the one that was
  * originally submitted by the block layer for the ref_tag usage. Due to
@@ -236,19 +180,14 @@ void t10_pi_prepare(struct request *rq, u8 protection_type)
  * likely to be different. Since the physical start sector was submitted
  * to the device, we should remap it back to virtual values expected by the
  * block layer.
- *
- * Type 3 does not have a reference tag so no remapping is required.
  */
-void t10_pi_complete(struct request *rq, u8 protection_type,
-		     unsigned int intervals)
+static void t10_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;
 	u32 ref_tag = t10_pi_ref_tag(rq);
 	struct bio *bio;
 
-	if (protection_type == T10_PI_TYPE3_PROTECTION)
-		return;
-
 	__rq_for_each_bio(bio, rq) {
 		struct bio_integrity_payload *bip = bio_integrity(bio);
 		u32 virt = bip_get_seed(bip) & 0xffffffff;
@@ -276,4 +215,73 @@ void t10_pi_complete(struct request *rq, u8 protection_type,
 		}
 	}
 }
-EXPORT_SYMBOL(t10_pi_complete);
+
+static blk_status_t t10_pi_type3_generate_crc(struct blk_integrity_iter *iter)
+{
+	return t10_pi_generate(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION);
+}
+
+static blk_status_t t10_pi_type3_generate_ip(struct blk_integrity_iter *iter)
+{
+	return t10_pi_generate(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION);
+}
+
+static blk_status_t t10_pi_type3_verify_crc(struct blk_integrity_iter *iter)
+{
+	return t10_pi_verify(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION);
+}
+
+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.
+ */
+static void t10_pi_type3_prepare(struct request *rq)
+{
+}
+
+/**
+ * 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)
+{
+}
+
+const struct blk_integrity_profile t10_pi_type1_crc = {
+	.name			= "T10-DIF-TYPE1-CRC",
+	.generate_fn		= t10_pi_type1_generate_crc,
+	.verify_fn		= t10_pi_type1_verify_crc,
+	.prepare_fn		= t10_pi_type1_prepare,
+	.complete_fn		= t10_pi_type1_complete,
+};
+EXPORT_SYMBOL(t10_pi_type1_crc);
+
+const struct blk_integrity_profile t10_pi_type1_ip = {
+	.name			= "T10-DIF-TYPE1-IP",
+	.generate_fn		= t10_pi_type1_generate_ip,
+	.verify_fn		= t10_pi_type1_verify_ip,
+	.prepare_fn		= t10_pi_type1_prepare,
+	.complete_fn		= t10_pi_type1_complete,
+};
+EXPORT_SYMBOL(t10_pi_type1_ip);
+
+const struct blk_integrity_profile t10_pi_type3_crc = {
+	.name			= "T10-DIF-TYPE3-CRC",
+	.generate_fn		= t10_pi_type3_generate_crc,
+	.verify_fn		= t10_pi_type3_verify_crc,
+	.prepare_fn		= t10_pi_type3_prepare,
+	.complete_fn		= t10_pi_type3_complete,
+};
+EXPORT_SYMBOL(t10_pi_type3_crc);
+
+const struct blk_integrity_profile t10_pi_type3_ip = {
+	.name			= "T10-DIF-TYPE3-IP",
+	.generate_fn		= t10_pi_type3_generate_ip,
+	.verify_fn		= t10_pi_type3_verify_ip,
+	.prepare_fn		= t10_pi_type3_prepare,
+	.complete_fn		= t10_pi_type3_complete,
+};
+EXPORT_SYMBOL(t10_pi_type3_ip);
diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index 9118ab8..dab4446 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -345,6 +345,14 @@ static void __DEBUG_bytes(__u8 *bytes, size_t len, const char *msg, ...)
 #define DEBUG_bytes(bytes, len, msg, ...)	do { } while (0)
 #endif
 
+static void dm_integrity_prepare(struct request *rq)
+{
+}
+
+static void dm_integrity_complete(struct request *rq, unsigned int nr_bytes)
+{
+}
+
 /*
  * DM Integrity profile, protection is performed layer above (dm-crypt)
  */
@@ -352,6 +360,8 @@ static void __DEBUG_bytes(__u8 *bytes, size_t len, const char *msg, ...)
 	.name			= "DM-DIF-EXT-TAG",
 	.generate_fn		= NULL,
 	.verify_fn		= NULL,
+	.prepare_fn		= dm_integrity_prepare,
+	.complete_fn		= dm_integrity_complete,
 };
 
 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map);
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index d3d6b7b..5f39408 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -659,8 +659,6 @@ static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
 			if (WARN_ON_ONCE(!nvme_ns_has_pi(ns)))
 				return BLK_STS_NOTSUPP;
 			control |= NVME_RW_PRINFO_PRACT;
-		} else if (req_op(req) == REQ_OP_WRITE) {
-			t10_pi_prepare(req, ns->pi_type);
 		}
 
 		switch (ns->pi_type) {
@@ -683,13 +681,6 @@ static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
 
 void nvme_cleanup_cmd(struct request *req)
 {
-	if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ &&
-	    nvme_req(req)->status == 0) {
-		struct nvme_ns *ns = req->rq_disk->private_data;
-
-		t10_pi_complete(req, ns->pi_type,
-				blk_rq_bytes(req) >> ns->lba_shift);
-	}
 	if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
 		struct nvme_ns *ns = req->rq_disk->private_data;
 		struct page *page = req->special_vec.bv_page;
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 149d406..2932d49 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1211,9 +1211,6 @@ static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
 	dix = scsi_prot_sg_count(cmd);
 	dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
 
-	if (write && dix)
-		t10_pi_prepare(cmd->request, sdkp->protection_type);
-
 	if (dif || dix)
 		protect = sd_setup_protect_cmnd(cmd, dix, dif);
 	else
@@ -2051,11 +2048,6 @@ static int sd_done(struct scsi_cmnd *SCpnt)
 					   "sd_done: completed %d of %d bytes\n",
 					   good_bytes, scsi_bufflen(SCpnt)));
 
-	if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt) &&
-	    good_bytes)
-		t10_pi_complete(SCpnt->request, sdkp->protection_type,
-				good_bytes / scsi_prot_interval(SCpnt));
-
 	return good_bytes;
 }
 
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 1ef375d..d73dc68 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1497,10 +1497,14 @@ struct blk_integrity_iter {
 };
 
 typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
+typedef void (integrity_prepare_fn) (struct request *);
+typedef void (integrity_complete_fn) (struct request *, unsigned int);
 
 struct blk_integrity_profile {
 	integrity_processing_fn		*generate_fn;
 	integrity_processing_fn		*verify_fn;
+	integrity_prepare_fn		*prepare_fn;
+	integrity_complete_fn		*complete_fn;
 	const char			*name;
 };
 
diff --git a/include/linux/t10-pi.h b/include/linux/t10-pi.h
index 3e2a80c..96305a6 100644
--- a/include/linux/t10-pi.h
+++ b/include/linux/t10-pi.h
@@ -53,18 +53,4 @@ static inline u32 t10_pi_ref_tag(struct request *rq)
 extern const struct blk_integrity_profile t10_pi_type3_crc;
 extern const struct blk_integrity_profile t10_pi_type3_ip;
 
-#ifdef CONFIG_BLK_DEV_INTEGRITY
-extern void t10_pi_prepare(struct request *rq, u8 protection_type);
-extern void t10_pi_complete(struct request *rq, u8 protection_type,
-			    unsigned int intervals);
-#else
-static inline void t10_pi_complete(struct request *rq, u8 protection_type,
-				   unsigned int intervals)
-{
-}
-static inline void t10_pi_prepare(struct request *rq, u8 protection_type)
-{
-}
-#endif
-
 #endif
-- 
1.8.3.1


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Re: [PATCH v5 2/2] block: centralize PI remapping logic to the block layer

[Jens Axboe]

On 9/11/19 9:23 AM, Max Gurtovoy wrote:
> @@ -1405,6 +1406,11 @@ bool blk_update_request(struct request *req, blk_status_t error,
>   	if (!req->bio)
>   		return false;
>   
> +	if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ &&
> +	    error == BLK_STS_OK)
> +		req->q->integrity.profile->complete_fn(req, nr_bytes);
> +
> +
>   	if (unlikely(error && !blk_rq_is_passthrough(req) &&
>   		     !(req->rq_flags & RQF_QUIET)))
>   		print_req_error(req, error, __func__);
> @@ -693,6 +694,10 @@ void blk_mq_start_request(struct request *rq)
>   		 */
>   		rq->nr_phys_segments++;
>   	}
> +
> +	if (blk_integrity_rq(rq) && req_op(rq) == REQ_OP_WRITE)
> +		rq->q->integrity.profile->prepare_fn(rq);
> +
>   }
>   EXPORT_SYMBOL(blk_mq_start_request);

While I like the idea of centralizing stuff like this, I'm also not
happy with adding checks like this to the fast path. But I guess it's
still better than stuff it in drivers.

You have an extra line after both of these above hunks for some reason.
Can you clean that up?

And the blk-mq.c hunk, we have 'q' in that function, use that instead of
rq->q.

-- 
Jens Axboe


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Re: [PATCH v5 2/2] block: centralize PI remapping logic to the block layer

[Martin K. Petersen]

Jens,

> While I like the idea of centralizing stuff like this, I'm also not
> happy with adding checks like this to the fast path.

Yeah, but at least it's just checking a request queue flag.

-- 
Martin K. Petersen	Oracle Linux Engineering

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Re: [PATCH v5 2/2] block: centralize PI remapping logic to the block layer

[Christoph Hellwig]

On Wed, Sep 11, 2019 at 04:01:11PM -0600, Jens Axboe wrote:
> While I like the idea of centralizing stuff like this, I'm also not
> happy with adding checks like this to the fast path. But I guess it's
> still better than stuff it in drivers.

Let's put it that way - we move the check from our two most commonly
drivers (one of those also is our most performance sensitive) to common
code.  I think this should generally be a net win?

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Re: [PATCH v5 2/2] block: centralize PI remapping logic to the block layer

[Martin K. Petersen]

Max,

> Currently t10_pi_prepare/t10_pi_complete functions are called during
> the NVMe and SCSi layers command preparetion/completion, but their
> actual place should be the block layer since T10-PI is a general data
> integrity feature that is used by block storage protocols. Introduce
> .prepare_fn and .complete_fn callbacks within the integrity profile
> that each type can implement according to its needs.

LGTM.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

-- 
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Re: [PATCH v5 1/2] block: use symbolic constants for t10_pi type

[Martin K. Petersen]

Max,

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

-- 
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