->retries fixups V2

->retries fixups V2

[Christoph Hellwig]

This series fixes a few lose bits in terms of how nvme uses ->retries,
including fixing it for non-PCIe transports.  While at it I noticed that
nvme and scsi use the field in entirely different ways, and no other
driver uses it at all.  So I decided to move it into the nvme_request and
scsi_request structures instead.

Changes since V1:
 - better changelog for one patch
 - move the new retries field to the end of struct nvme_request

->retries fixups V2

[Christoph Hellwig]

This series fixes a few lose bits in terms of how nvme uses ->retries,
including fixing it for non-PCIe transports.  While at it I noticed that
nvme and scsi use the field in entirely different ways, and no other
driver uses it at all.  So I decided to move it into the nvme_request and
scsi_request structures instead.

Changes since V1:
 - better changelog for one patch
 - move the new retries field to the end of struct nvme_request

[PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Christoph Hellwig]

->retries is counting the number of times a command is resubmitted, and
be cleared on the first time we see the command.  We currently don't do
that for non-PCIe command, which is easily fixed by moving the setup
to common code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/core.c | 5 +++++
 drivers/nvme/host/pci.c  | 4 ----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3c908e1bc903..0437f44d00f9 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -350,6 +350,11 @@ int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 {
 	int ret = BLK_MQ_RQ_QUEUE_OK;
 
+	if (!(req->rq_flags & RQF_DONTPREP)) {
+		req->retries = 0;
+		req->rq_flags |= RQF_DONTPREP;
+	}
+
 	switch (req_op(req)) {
 	case REQ_OP_DRV_IN:
 	case REQ_OP_DRV_OUT:
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 9e686a67d93b..3818ab15a26e 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -326,10 +326,6 @@ static int nvme_init_iod(struct request *rq, struct nvme_dev *dev)
 	iod->nents = 0;
 	iod->length = size;
 
-	if (!(rq->rq_flags & RQF_DONTPREP)) {
-		rq->retries = 0;
-		rq->rq_flags |= RQF_DONTPREP;
-	}
 	return BLK_MQ_RQ_QUEUE_OK;
 }
 
-- 
2.11.0

[PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Christoph Hellwig]

->retries is counting the number of times a command is resubmitted, and
be cleared on the first time we see the command.  We currently don't do
that for non-PCIe command, which is easily fixed by moving the setup
to common code.

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/core.c | 5 +++++
 drivers/nvme/host/pci.c  | 4 ----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3c908e1bc903..0437f44d00f9 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -350,6 +350,11 @@ int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 {
 	int ret = BLK_MQ_RQ_QUEUE_OK;
 
+	if (!(req->rq_flags & RQF_DONTPREP)) {
+		req->retries = 0;
+		req->rq_flags |= RQF_DONTPREP;
+	}
+
 	switch (req_op(req)) {
 	case REQ_OP_DRV_IN:
 	case REQ_OP_DRV_OUT:
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 9e686a67d93b..3818ab15a26e 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -326,10 +326,6 @@ static int nvme_init_iod(struct request *rq, struct nvme_dev *dev)
 	iod->nents = 0;
 	iod->length = size;
 
-	if (!(rq->rq_flags & RQF_DONTPREP)) {
-		rq->retries = 0;
-		rq->rq_flags |= RQF_DONTPREP;
-	}
 	return BLK_MQ_RQ_QUEUE_OK;
 }
 
-- 
2.11.0

Re: [PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

[PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi at grimberg.me>

Re: [PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Johannes Thumshirn]

On Wed, Apr 05, 2017 at 07:18:08PM +0200, Christoph Hellwig wrote:
> ->retries is counting the number of times a command is resubmitted, and
> be cleared on the first time we see the command.  We currently don't do
> that for non-PCIe command, which is easily fixed by moving the setup
> to common code.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---

Thanks a lot.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>

-- 
Johannes Thumshirn                                          Storage
jthumshirn@suse.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N�rnberg
GF: Felix Imend�rffer, Jane Smithard, Graham Norton
HRB 21284 (AG N�rnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850

[PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Johannes Thumshirn]

On Wed, Apr 05, 2017@07:18:08PM +0200, Christoph Hellwig wrote:
> ->retries is counting the number of times a command is resubmitted, and
> be cleared on the first time we see the command.  We currently don't do
> that for non-PCIe command, which is easily fixed by moving the setup
> to common code.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---

Thanks a lot.

Reviewed-by: Johannes Thumshirn <jthumshirn at suse.de>

-- 
Johannes Thumshirn                                          Storage
jthumshirn at suse.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: Felix Imend?rffer, Jane Smithard, Graham Norton
HRB 21284 (AG N?rnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850

Re: [PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Johannes Thumshirn]

On Wed, Apr 05, 2017 at 07:18:08PM +0200, Christoph Hellwig wrote:
> ->retries is counting the number of times a command is resubmitted, and
> be cleared on the first time we see the command.  We currently don't do
> that for non-PCIe command, which is easily fixed by moving the setup
> to common code.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---

Thanks a lot.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>

-- 
Johannes Thumshirn                                          Storage
jthumshirn@suse.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850

[PATCH 2/5] nvme: cleanup nvme_req_needs_retry

[Christoph Hellwig]

Don't pass the status explicitly but derive it from the requeust,
and unwind the complex condition to be more readable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/nvme/host/core.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 0437f44d00f9..b225aacf4b89 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -67,11 +67,17 @@ static DEFINE_SPINLOCK(dev_list_lock);
 
 static struct class *nvme_class;
 
-static inline bool nvme_req_needs_retry(struct request *req, u16 status)
+static inline bool nvme_req_needs_retry(struct request *req)
 {
-	return !(status & NVME_SC_DNR || blk_noretry_request(req)) &&
-		(jiffies - req->start_time) < req->timeout &&
-		req->retries < nvme_max_retries;
+	if (blk_noretry_request(req))
+		return false;
+	if (req->errors & NVME_SC_DNR)
+		return false;
+	if (jiffies - req->start_time >= req->timeout)
+		return false;
+	if (req->retries >= nvme_max_retries)
+		return false;
+	return true;
 }
 
 void nvme_complete_rq(struct request *req)
@@ -79,7 +85,7 @@ void nvme_complete_rq(struct request *req)
 	int error = 0;
 
 	if (unlikely(req->errors)) {
-		if (nvme_req_needs_retry(req, req->errors)) {
+		if (nvme_req_needs_retry(req)) {
 			req->retries++;
 			blk_mq_requeue_request(req,
 					!blk_mq_queue_stopped(req->q));
-- 
2.11.0

[PATCH 2/5] nvme: cleanup nvme_req_needs_retry

[Christoph Hellwig]

Don't pass the status explicitly but derive it from the requeust,
and unwind the complex condition to be more readable.

Signed-off-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn at suse.de>
---
 drivers/nvme/host/core.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 0437f44d00f9..b225aacf4b89 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -67,11 +67,17 @@ static DEFINE_SPINLOCK(dev_list_lock);
 
 static struct class *nvme_class;
 
-static inline bool nvme_req_needs_retry(struct request *req, u16 status)
+static inline bool nvme_req_needs_retry(struct request *req)
 {
-	return !(status & NVME_SC_DNR || blk_noretry_request(req)) &&
-		(jiffies - req->start_time) < req->timeout &&
-		req->retries < nvme_max_retries;
+	if (blk_noretry_request(req))
+		return false;
+	if (req->errors & NVME_SC_DNR)
+		return false;
+	if (jiffies - req->start_time >= req->timeout)
+		return false;
+	if (req->retries >= nvme_max_retries)
+		return false;
+	return true;
 }
 
 void nvme_complete_rq(struct request *req)
@@ -79,7 +85,7 @@ void nvme_complete_rq(struct request *req)
 	int error = 0;
 
 	if (unlikely(req->errors)) {
-		if (nvme_req_needs_retry(req, req->errors)) {
+		if (nvme_req_needs_retry(req)) {
 			req->retries++;
 			blk_mq_requeue_request(req,
 					!blk_mq_queue_stopped(req->q));
-- 
2.11.0

Re: [PATCH 2/5] nvme: cleanup nvme_req_needs_retry

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

[PATCH 2/5] nvme: cleanup nvme_req_needs_retry

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi at grimberg.me>

[PATCH 3/5] nvme: mark nvme_max_retries static

[Christoph Hellwig]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/nvme/host/core.c | 3 +--
 drivers/nvme/host/nvme.h | 2 --
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index b225aacf4b89..933e67c60e33 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -49,10 +49,9 @@ unsigned char shutdown_timeout = 5;
 module_param(shutdown_timeout, byte, 0644);
 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
 
-unsigned int nvme_max_retries = 5;
+static unsigned int nvme_max_retries = 5;
 module_param_named(max_retries, nvme_max_retries, uint, 0644);
 MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
-EXPORT_SYMBOL_GPL(nvme_max_retries);
 
 static int nvme_char_major;
 module_param(nvme_char_major, int, 0);
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 227f281482db..82ba9a305301 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -43,8 +43,6 @@ extern unsigned char shutdown_timeout;
 #define NVME_DEFAULT_KATO	5
 #define NVME_KATO_GRACE		10
 
-extern unsigned int nvme_max_retries;
-
 enum {
 	NVME_NS_LBA		= 0,
 	NVME_NS_LIGHTNVM	= 1,
-- 
2.11.0

[PATCH 3/5] nvme: mark nvme_max_retries static

[Christoph Hellwig]

Signed-off-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn at suse.de>
---
 drivers/nvme/host/core.c | 3 +--
 drivers/nvme/host/nvme.h | 2 --
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index b225aacf4b89..933e67c60e33 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -49,10 +49,9 @@ unsigned char shutdown_timeout = 5;
 module_param(shutdown_timeout, byte, 0644);
 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
 
-unsigned int nvme_max_retries = 5;
+static unsigned int nvme_max_retries = 5;
 module_param_named(max_retries, nvme_max_retries, uint, 0644);
 MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
-EXPORT_SYMBOL_GPL(nvme_max_retries);
 
 static int nvme_char_major;
 module_param(nvme_char_major, int, 0);
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 227f281482db..82ba9a305301 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -43,8 +43,6 @@ extern unsigned char shutdown_timeout;
 #define NVME_DEFAULT_KATO	5
 #define NVME_KATO_GRACE		10
 
-extern unsigned int nvme_max_retries;
-
 enum {
 	NVME_NS_LBA		= 0,
 	NVME_NS_LIGHTNVM	= 1,
-- 
2.11.0

Re: [PATCH 3/5] nvme: mark nvme_max_retries static

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

[PATCH 3/5] nvme: mark nvme_max_retries static

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi at grimberg.me>

[PATCH 4/5] nvme: move the retries count to struct nvme_request

[Christoph Hellwig]

The way NVMe uses this field is entirely different from the older
SCSI/BLOCK_PC usage, so move it into struct nvme_request.

Also reduce the size of the file to a unsigned char so that we leave
space for additional smaller fields that will appear soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/nvme/host/core.c | 10 +++++-----
 drivers/nvme/host/nvme.h |  1 +
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 933e67c60e33..dc05f41c3992 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -49,8 +49,8 @@ unsigned char shutdown_timeout = 5;
 module_param(shutdown_timeout, byte, 0644);
 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
 
-static unsigned int nvme_max_retries = 5;
-module_param_named(max_retries, nvme_max_retries, uint, 0644);
+static u8 nvme_max_retries = 5;
+module_param_named(max_retries, nvme_max_retries, byte, 0644);
 MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
 
 static int nvme_char_major;
@@ -74,7 +74,7 @@ static inline bool nvme_req_needs_retry(struct request *req)
 		return false;
 	if (jiffies - req->start_time >= req->timeout)
 		return false;
-	if (req->retries >= nvme_max_retries)
+	if (nvme_req(req)->retries >= nvme_max_retries)
 		return false;
 	return true;
 }
@@ -85,7 +85,7 @@ void nvme_complete_rq(struct request *req)
 
 	if (unlikely(req->errors)) {
 		if (nvme_req_needs_retry(req)) {
-			req->retries++;
+			nvme_req(req)->retries++;
 			blk_mq_requeue_request(req,
 					!blk_mq_queue_stopped(req->q));
 			return;
@@ -356,7 +356,7 @@ int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 	int ret = BLK_MQ_RQ_QUEUE_OK;
 
 	if (!(req->rq_flags & RQF_DONTPREP)) {
-		req->retries = 0;
+		nvme_req(req)->retries = 0;
 		req->rq_flags |= RQF_DONTPREP;
 	}
 
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 82ba9a305301..9eecb67177df 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -90,6 +90,7 @@ enum nvme_quirks {
 struct nvme_request {
 	struct nvme_command	*cmd;
 	union nvme_result	result;
+	u8			retries;
 };
 
 static inline struct nvme_request *nvme_req(struct request *req)
-- 
2.11.0

[PATCH 4/5] nvme: move the retries count to struct nvme_request

[Christoph Hellwig]

The way NVMe uses this field is entirely different from the older
SCSI/BLOCK_PC usage, so move it into struct nvme_request.

Also reduce the size of the file to a unsigned char so that we leave
space for additional smaller fields that will appear soon.

Signed-off-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn at suse.de>
---
 drivers/nvme/host/core.c | 10 +++++-----
 drivers/nvme/host/nvme.h |  1 +
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 933e67c60e33..dc05f41c3992 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -49,8 +49,8 @@ unsigned char shutdown_timeout = 5;
 module_param(shutdown_timeout, byte, 0644);
 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
 
-static unsigned int nvme_max_retries = 5;
-module_param_named(max_retries, nvme_max_retries, uint, 0644);
+static u8 nvme_max_retries = 5;
+module_param_named(max_retries, nvme_max_retries, byte, 0644);
 MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
 
 static int nvme_char_major;
@@ -74,7 +74,7 @@ static inline bool nvme_req_needs_retry(struct request *req)
 		return false;
 	if (jiffies - req->start_time >= req->timeout)
 		return false;
-	if (req->retries >= nvme_max_retries)
+	if (nvme_req(req)->retries >= nvme_max_retries)
 		return false;
 	return true;
 }
@@ -85,7 +85,7 @@ void nvme_complete_rq(struct request *req)
 
 	if (unlikely(req->errors)) {
 		if (nvme_req_needs_retry(req)) {
-			req->retries++;
+			nvme_req(req)->retries++;
 			blk_mq_requeue_request(req,
 					!blk_mq_queue_stopped(req->q));
 			return;
@@ -356,7 +356,7 @@ int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 	int ret = BLK_MQ_RQ_QUEUE_OK;
 
 	if (!(req->rq_flags & RQF_DONTPREP)) {
-		req->retries = 0;
+		nvme_req(req)->retries = 0;
 		req->rq_flags |= RQF_DONTPREP;
 	}
 
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 82ba9a305301..9eecb67177df 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -90,6 +90,7 @@ enum nvme_quirks {
 struct nvme_request {
 	struct nvme_command	*cmd;
 	union nvme_result	result;
+	u8			retries;
 };
 
 static inline struct nvme_request *nvme_req(struct request *req)
-- 
2.11.0

Re: [PATCH 4/5] nvme: move the retries count to struct nvme_request

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

[PATCH 4/5] nvme: move the retries count to struct nvme_request

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi at grimberg.me>

[PATCH 5/5] block, scsi: move the retries field to struct scsi_request

[Christoph Hellwig]

Instead of bloating the generic struct request with it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 block/scsi_ioctl.c                 | 8 ++++----
 drivers/scsi/osd/osd_initiator.c   | 2 +-
 drivers/scsi/osst.c                | 2 +-
 drivers/scsi/scsi_error.c          | 2 +-
 drivers/scsi/scsi_lib.c            | 4 ++--
 drivers/scsi/sg.c                  | 2 +-
 drivers/scsi/st.c                  | 2 +-
 drivers/target/target_core_pscsi.c | 2 +-
 include/linux/blkdev.h             | 1 -
 include/scsi/scsi_request.h        | 1 +
 10 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 2a2fc768b27a..82a43bb19967 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -362,7 +362,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 		goto out_free_cdb;
 
 	bio = rq->bio;
-	rq->retries = 0;
+	req->retries = 0;
 
 	start_time = jiffies;
 
@@ -476,13 +476,13 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 		goto error;
 
 	/* default.  possible overriden later */
-	rq->retries = 5;
+	req->retries = 5;
 
 	switch (opcode) {
 	case SEND_DIAGNOSTIC:
 	case FORMAT_UNIT:
 		rq->timeout = FORMAT_UNIT_TIMEOUT;
-		rq->retries = 1;
+		req->retries = 1;
 		break;
 	case START_STOP:
 		rq->timeout = START_STOP_TIMEOUT;
@@ -495,7 +495,7 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 		break;
 	case READ_DEFECT_DATA:
 		rq->timeout = READ_DEFECT_DATA_TIMEOUT;
-		rq->retries = 1;
+		req->retries = 1;
 		break;
 	default:
 		rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index 6903f03c88af..9d0727b2bdec 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -1602,7 +1602,7 @@ static int _init_blk_request(struct osd_request *or,
 	req->rq_flags |= RQF_QUIET;
 
 	req->timeout = or->timeout;
-	req->retries = or->retries;
+	scsi_req(req)->retries = or->retries;
 
 	if (has_out) {
 		or->out.req = req;
diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c
index c47f4b349bac..41bc1d64bf86 100644
--- a/drivers/scsi/osst.c
+++ b/drivers/scsi/osst.c
@@ -414,7 +414,7 @@ static int osst_execute(struct osst_request *SRpnt, const unsigned char *cmd,
 	memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
 	memcpy(rq->cmd, cmd, rq->cmd_len);
 	req->timeout = timeout;
-	req->retries = retries;
+	rq->retries = retries;
 	req->end_io_data = SRpnt;
 
 	blk_execute_rq_nowait(req->q, NULL, req, 1, osst_end_async);
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index f2cafae150bc..2db412dd4b44 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1988,7 +1988,7 @@ static void scsi_eh_lock_door(struct scsi_device *sdev)
 
 	req->rq_flags |= RQF_QUIET;
 	req->timeout = 10 * HZ;
-	req->retries = 5;
+	rq->retries = 5;
 
 	blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done);
 }
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index c1519660824b..11972d1075f1 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -256,7 +256,7 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 
 	rq->cmd_len = COMMAND_SIZE(cmd[0]);
 	memcpy(rq->cmd, cmd, rq->cmd_len);
-	req->retries = retries;
+	rq->retries = retries;
 	req->timeout = timeout;
 	req->cmd_flags |= flags;
 	req->rq_flags |= rq_flags | RQF_QUIET | RQF_PREEMPT;
@@ -1177,7 +1177,7 @@ static int scsi_setup_scsi_cmnd(struct scsi_device *sdev, struct request *req)
 	cmd->cmd_len = scsi_req(req)->cmd_len;
 	cmd->cmnd = scsi_req(req)->cmd;
 	cmd->transfersize = blk_rq_bytes(req);
-	cmd->allowed = req->retries;
+	cmd->allowed = scsi_req(req)->retries;
 	return BLKPREP_OK;
 }
 
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 225abaad4d1c..c5aaceea8d77 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1718,7 +1718,7 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
 
 	srp->rq = rq;
 	rq->end_io_data = srp;
-	rq->retries = SG_DEFAULT_RETRIES;
+	req->retries = SG_DEFAULT_RETRIES;
 
 	if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
 		return 0;
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index e5ef78a6848e..5408643431bb 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -579,7 +579,7 @@ static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
 	memset(rq->cmd, 0, BLK_MAX_CDB);
 	memcpy(rq->cmd, cmd, rq->cmd_len);
 	req->timeout = timeout;
-	req->retries = retries;
+	rq->retries = retries;
 	req->end_io_data = SRpnt;
 
 	blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index 94cda7991e80..c7fa372c527a 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -1008,7 +1008,7 @@ pscsi_execute_cmd(struct se_cmd *cmd)
 		req->timeout = PS_TIMEOUT_DISK;
 	else
 		req->timeout = PS_TIMEOUT_OTHER;
-	req->retries = PS_RETRY;
+	scsi_req(req)->retries = PS_RETRY;
 
 	blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
 			(cmd->sam_task_attr == TCM_HEAD_TAG),
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index a2dc6b390d48..ce6f9a6534c9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -224,7 +224,6 @@ struct request {
 	unsigned long deadline;
 	struct list_head timeout_list;
 	unsigned int timeout;
-	int retries;
 
 	/*
 	 * completion callback.
diff --git a/include/scsi/scsi_request.h b/include/scsi/scsi_request.h
index ba0aeb980f7e..7c583a0f363a 100644
--- a/include/scsi/scsi_request.h
+++ b/include/scsi/scsi_request.h
@@ -11,6 +11,7 @@ struct scsi_request {
 	unsigned short	cmd_len;
 	unsigned int	sense_len;
 	unsigned int	resid_len;	/* residual count */
+	int		retries;
 	void		*sense;
 };
 
-- 
2.11.0

[PATCH 5/5] block, scsi: move the retries field to struct scsi_request

[Christoph Hellwig]

Instead of bloating the generic struct request with it.

Signed-off-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn at suse.de>
---
 block/scsi_ioctl.c                 | 8 ++++----
 drivers/scsi/osd/osd_initiator.c   | 2 +-
 drivers/scsi/osst.c                | 2 +-
 drivers/scsi/scsi_error.c          | 2 +-
 drivers/scsi/scsi_lib.c            | 4 ++--
 drivers/scsi/sg.c                  | 2 +-
 drivers/scsi/st.c                  | 2 +-
 drivers/target/target_core_pscsi.c | 2 +-
 include/linux/blkdev.h             | 1 -
 include/scsi/scsi_request.h        | 1 +
 10 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 2a2fc768b27a..82a43bb19967 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -362,7 +362,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 		goto out_free_cdb;
 
 	bio = rq->bio;
-	rq->retries = 0;
+	req->retries = 0;
 
 	start_time = jiffies;
 
@@ -476,13 +476,13 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 		goto error;
 
 	/* default.  possible overriden later */
-	rq->retries = 5;
+	req->retries = 5;
 
 	switch (opcode) {
 	case SEND_DIAGNOSTIC:
 	case FORMAT_UNIT:
 		rq->timeout = FORMAT_UNIT_TIMEOUT;
-		rq->retries = 1;
+		req->retries = 1;
 		break;
 	case START_STOP:
 		rq->timeout = START_STOP_TIMEOUT;
@@ -495,7 +495,7 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 		break;
 	case READ_DEFECT_DATA:
 		rq->timeout = READ_DEFECT_DATA_TIMEOUT;
-		rq->retries = 1;
+		req->retries = 1;
 		break;
 	default:
 		rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index 6903f03c88af..9d0727b2bdec 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -1602,7 +1602,7 @@ static int _init_blk_request(struct osd_request *or,
 	req->rq_flags |= RQF_QUIET;
 
 	req->timeout = or->timeout;
-	req->retries = or->retries;
+	scsi_req(req)->retries = or->retries;
 
 	if (has_out) {
 		or->out.req = req;
diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c
index c47f4b349bac..41bc1d64bf86 100644
--- a/drivers/scsi/osst.c
+++ b/drivers/scsi/osst.c
@@ -414,7 +414,7 @@ static int osst_execute(struct osst_request *SRpnt, const unsigned char *cmd,
 	memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
 	memcpy(rq->cmd, cmd, rq->cmd_len);
 	req->timeout = timeout;
-	req->retries = retries;
+	rq->retries = retries;
 	req->end_io_data = SRpnt;
 
 	blk_execute_rq_nowait(req->q, NULL, req, 1, osst_end_async);
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index f2cafae150bc..2db412dd4b44 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1988,7 +1988,7 @@ static void scsi_eh_lock_door(struct scsi_device *sdev)
 
 	req->rq_flags |= RQF_QUIET;
 	req->timeout = 10 * HZ;
-	req->retries = 5;
+	rq->retries = 5;
 
 	blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done);
 }
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index c1519660824b..11972d1075f1 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -256,7 +256,7 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 
 	rq->cmd_len = COMMAND_SIZE(cmd[0]);
 	memcpy(rq->cmd, cmd, rq->cmd_len);
-	req->retries = retries;
+	rq->retries = retries;
 	req->timeout = timeout;
 	req->cmd_flags |= flags;
 	req->rq_flags |= rq_flags | RQF_QUIET | RQF_PREEMPT;
@@ -1177,7 +1177,7 @@ static int scsi_setup_scsi_cmnd(struct scsi_device *sdev, struct request *req)
 	cmd->cmd_len = scsi_req(req)->cmd_len;
 	cmd->cmnd = scsi_req(req)->cmd;
 	cmd->transfersize = blk_rq_bytes(req);
-	cmd->allowed = req->retries;
+	cmd->allowed = scsi_req(req)->retries;
 	return BLKPREP_OK;
 }
 
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 225abaad4d1c..c5aaceea8d77 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1718,7 +1718,7 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
 
 	srp->rq = rq;
 	rq->end_io_data = srp;
-	rq->retries = SG_DEFAULT_RETRIES;
+	req->retries = SG_DEFAULT_RETRIES;
 
 	if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
 		return 0;
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index e5ef78a6848e..5408643431bb 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -579,7 +579,7 @@ static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
 	memset(rq->cmd, 0, BLK_MAX_CDB);
 	memcpy(rq->cmd, cmd, rq->cmd_len);
 	req->timeout = timeout;
-	req->retries = retries;
+	rq->retries = retries;
 	req->end_io_data = SRpnt;
 
 	blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index 94cda7991e80..c7fa372c527a 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -1008,7 +1008,7 @@ pscsi_execute_cmd(struct se_cmd *cmd)
 		req->timeout = PS_TIMEOUT_DISK;
 	else
 		req->timeout = PS_TIMEOUT_OTHER;
-	req->retries = PS_RETRY;
+	scsi_req(req)->retries = PS_RETRY;
 
 	blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
 			(cmd->sam_task_attr == TCM_HEAD_TAG),
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index a2dc6b390d48..ce6f9a6534c9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -224,7 +224,6 @@ struct request {
 	unsigned long deadline;
 	struct list_head timeout_list;
 	unsigned int timeout;
-	int retries;
 
 	/*
 	 * completion callback.
diff --git a/include/scsi/scsi_request.h b/include/scsi/scsi_request.h
index ba0aeb980f7e..7c583a0f363a 100644
--- a/include/scsi/scsi_request.h
+++ b/include/scsi/scsi_request.h
@@ -11,6 +11,7 @@ struct scsi_request {
 	unsigned short	cmd_len;
 	unsigned int	sense_len;
 	unsigned int	resid_len;	/* residual count */
+	int		retries;
 	void		*sense;
 };
 
-- 
2.11.0

Re: [PATCH 5/5] block, scsi: move the retries field to struct scsi_request

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

[PATCH 5/5] block, scsi: move the retries field to struct scsi_request

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi at grimberg.me>

Re: ->retries fixups V2

[Jens Axboe]

On Wed, Apr 05 2017, Christoph Hellwig wrote:
> This series fixes a few lose bits in terms of how nvme uses ->retries,
> including fixing it for non-PCIe transports.  While at it I noticed that
> nvme and scsi use the field in entirely different ways, and no other
> driver uses it at all.  So I decided to move it into the nvme_request and
> scsi_request structures instead.
> 
> Changes since V1:
>  - better changelog for one patch
>  - move the new retries field to the end of struct nvme_request

Applied for 4.12. If we do the below on my box, we remove the (now) 2
holes from struct request and shrink it 8 bytes.

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ce6f9a6534c9..3cf241b0814d 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -215,6 +215,8 @@ struct request {
 
 	unsigned short ioprio;
 
+	unsigned int timeout;
+
 	void *special;		/* opaque pointer available for LLD use */
 
 	int errors;
@@ -223,7 +225,6 @@ struct request {
 
 	unsigned long deadline;
 	struct list_head timeout_list;
-	unsigned int timeout;
 
 	/*
 	 * completion callback.

-- 
Jens Axboe

->retries fixups V2

[Jens Axboe]

On Wed, Apr 05 2017, Christoph Hellwig wrote:
> This series fixes a few lose bits in terms of how nvme uses ->retries,
> including fixing it for non-PCIe transports.  While at it I noticed that
> nvme and scsi use the field in entirely different ways, and no other
> driver uses it at all.  So I decided to move it into the nvme_request and
> scsi_request structures instead.
> 
> Changes since V1:
>  - better changelog for one patch
>  - move the new retries field to the end of struct nvme_request

Applied for 4.12. If we do the below on my box, we remove the (now) 2
holes from struct request and shrink it 8 bytes.

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ce6f9a6534c9..3cf241b0814d 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -215,6 +215,8 @@ struct request {
 
 	unsigned short ioprio;
 
+	unsigned int timeout;
+
 	void *special;		/* opaque pointer available for LLD use */
 
 	int errors;
@@ -223,7 +225,6 @@ struct request {
 
 	unsigned long deadline;
 	struct list_head timeout_list;
-	unsigned int timeout;
 
 	/*
 	 * completion callback.

-- 
Jens Axboe

Re: ->retries fixups V2

[Christoph Hellwig]

On Wed, Apr 05, 2017 at 12:06:53PM -0600, Jens Axboe wrote:
> On Wed, Apr 05 2017, Christoph Hellwig wrote:
> > This series fixes a few lose bits in terms of how nvme uses ->retries,
> > including fixing it for non-PCIe transports.  While at it I noticed that
> > nvme and scsi use the field in entirely different ways, and no other
> > driver uses it at all.  So I decided to move it into the nvme_request and
> > scsi_request structures instead.
> > 
> > Changes since V1:
> >  - better changelog for one patch
> >  - move the new retries field to the end of struct nvme_request
> 
> Applied for 4.12. If we do the below on my box, we remove the (now) 2
> holes from struct request and shrink it 8 bytes.

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

->retries fixups V2

[Christoph Hellwig]

On Wed, Apr 05, 2017@12:06:53PM -0600, Jens Axboe wrote:
> On Wed, Apr 05 2017, Christoph Hellwig wrote:
> > This series fixes a few lose bits in terms of how nvme uses ->retries,
> > including fixing it for non-PCIe transports.  While at it I noticed that
> > nvme and scsi use the field in entirely different ways, and no other
> > driver uses it at all.  So I decided to move it into the nvme_request and
> > scsi_request structures instead.
> > 
> > Changes since V1:
> >  - better changelog for one patch
> >  - move the new retries field to the end of struct nvme_request
> 
> Applied for 4.12. If we do the below on my box, we remove the (now) 2
> holes from struct request and shrink it 8 bytes.

Looks good:

Reviewed-by: Christoph Hellwig <hch at lst.de>

Re: ->retries fixups V2

[Jens Axboe]

On 04/05/2017 12:16 PM, Christoph Hellwig wrote:
> On Wed, Apr 05, 2017 at 12:06:53PM -0600, Jens Axboe wrote:
>> On Wed, Apr 05 2017, Christoph Hellwig wrote:
>>> This series fixes a few lose bits in terms of how nvme uses ->retries,
>>> including fixing it for non-PCIe transports.  While at it I noticed that
>>> nvme and scsi use the field in entirely different ways, and no other
>>> driver uses it at all.  So I decided to move it into the nvme_request and
>>> scsi_request structures instead.
>>>
>>> Changes since V1:
>>>  - better changelog for one patch
>>>  - move the new retries field to the end of struct nvme_request
>>
>> Applied for 4.12. If we do the below on my box, we remove the (now) 2
>> holes from struct request and shrink it 8 bytes.
> 
> Looks good:
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Thanks, added that too.

-- 
Jens Axboe

->retries fixups V2

[Jens Axboe]

On 04/05/2017 12:16 PM, Christoph Hellwig wrote:
> On Wed, Apr 05, 2017@12:06:53PM -0600, Jens Axboe wrote:
>> On Wed, Apr 05 2017, Christoph Hellwig wrote:
>>> This series fixes a few lose bits in terms of how nvme uses ->retries,
>>> including fixing it for non-PCIe transports.  While at it I noticed that
>>> nvme and scsi use the field in entirely different ways, and no other
>>> driver uses it at all.  So I decided to move it into the nvme_request and
>>> scsi_request structures instead.
>>>
>>> Changes since V1:
>>>  - better changelog for one patch
>>>  - move the new retries field to the end of struct nvme_request
>>
>> Applied for 4.12. If we do the below on my box, we remove the (now) 2
>> holes from struct request and shrink it 8 bytes.
> 
> Looks good:
> 
> Reviewed-by: Christoph Hellwig <hch at lst.de>

Thanks, added that too.

-- 
Jens Axboe

->retries fixups

[Christoph Hellwig]

This series fixes a few lose bits in terms of how nvme uses ->retries,
including fixing it for non-PCIe transports.  While at it I noticed that
nvme and scsi use the field in entirely different ways, and no other
driver uses it at all.  So I decided to move it into the nvme_request and
scsi_request structures instead.

[PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Christoph Hellwig]

This way we get the behavior right for the non-PCIe transports.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/core.c | 5 +++++
 drivers/nvme/host/pci.c  | 4 ----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3c908e1bc903..0437f44d00f9 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -350,6 +350,11 @@ int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 {
 	int ret = BLK_MQ_RQ_QUEUE_OK;
 
+	if (!(req->rq_flags & RQF_DONTPREP)) {
+		req->retries = 0;
+		req->rq_flags |= RQF_DONTPREP;
+	}
+
 	switch (req_op(req)) {
 	case REQ_OP_DRV_IN:
 	case REQ_OP_DRV_OUT:
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 9e686a67d93b..3818ab15a26e 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -326,10 +326,6 @@ static int nvme_init_iod(struct request *rq, struct nvme_dev *dev)
 	iod->nents = 0;
 	iod->length = size;
 
-	if (!(rq->rq_flags & RQF_DONTPREP)) {
-		rq->retries = 0;
-		rq->rq_flags |= RQF_DONTPREP;
-	}
 	return BLK_MQ_RQ_QUEUE_OK;
 }
 
-- 
2.11.0

[PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Christoph Hellwig]

This way we get the behavior right for the non-PCIe transports.

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/core.c | 5 +++++
 drivers/nvme/host/pci.c  | 4 ----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3c908e1bc903..0437f44d00f9 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -350,6 +350,11 @@ int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 {
 	int ret = BLK_MQ_RQ_QUEUE_OK;
 
+	if (!(req->rq_flags & RQF_DONTPREP)) {
+		req->retries = 0;
+		req->rq_flags |= RQF_DONTPREP;
+	}
+
 	switch (req_op(req)) {
 	case REQ_OP_DRV_IN:
 	case REQ_OP_DRV_OUT:
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 9e686a67d93b..3818ab15a26e 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -326,10 +326,6 @@ static int nvme_init_iod(struct request *rq, struct nvme_dev *dev)
 	iod->nents = 0;
 	iod->length = size;
 
-	if (!(rq->rq_flags & RQF_DONTPREP)) {
-		rq->retries = 0;
-		rq->rq_flags |= RQF_DONTPREP;
-	}
 	return BLK_MQ_RQ_QUEUE_OK;
 }
 
-- 
2.11.0

Re: [PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Johannes Thumshirn]

On Wed, Apr 05, 2017 at 04:18:52PM +0200, Christoph Hellwig wrote:
> This way we get the behavior right for the non-PCIe transports.

Could you please share a bit of your minds inner workings for us mere mortals?

Thanks,
	Johannes
-- 
Johannes Thumshirn                                          Storage
jthumshirn@suse.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N�rnberg
GF: Felix Imend�rffer, Jane Smithard, Graham Norton
HRB 21284 (AG N�rnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850

[PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Johannes Thumshirn]

On Wed, Apr 05, 2017@04:18:52PM +0200, Christoph Hellwig wrote:
> This way we get the behavior right for the non-PCIe transports.

Could you please share a bit of your minds inner workings for us mere mortals?

Thanks,
	Johannes
-- 
Johannes Thumshirn                                          Storage
jthumshirn at suse.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: Felix Imend?rffer, Jane Smithard, Graham Norton
HRB 21284 (AG N?rnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850

Re: [PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Johannes Thumshirn]

On Wed, Apr 05, 2017 at 04:18:52PM +0200, Christoph Hellwig wrote:
> This way we get the behavior right for the non-PCIe transports.

Could you please share a bit of your minds inner workings for us mere mortals?

Thanks,
	Johannes
-- 
Johannes Thumshirn                                          Storage
jthumshirn@suse.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850

Re: [PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Christoph Hellwig]

On Wed, Apr 05, 2017 at 04:43:34PM +0200, Johannes Thumshirn wrote:
> On Wed, Apr 05, 2017 at 04:18:52PM +0200, Christoph Hellwig wrote:
> > This way we get the behavior right for the non-PCIe transports.
> 
> Could you please share a bit of your minds inner workings for us mere mortals?

It's initialized to zero the first time the command is submitted
and will then be incremented when queueing a retry.

[PATCH 1/5] nvme: move ->retries setup to nvme_setup_cmd

[Christoph Hellwig]

On Wed, Apr 05, 2017@04:43:34PM +0200, Johannes Thumshirn wrote:
> On Wed, Apr 05, 2017@04:18:52PM +0200, Christoph Hellwig wrote:
> > This way we get the behavior right for the non-PCIe transports.
> 
> Could you please share a bit of your minds inner workings for us mere mortals?

It's initialized to zero the first time the command is submitted
and will then be incremented when queueing a retry.