diff mbox series

[v17,08/12] nvmet: add copy command support for bdev and file ns

Message ID 20231019110147.31672-9-nj.shetty@samsung.com (mailing list archive)
State Not Applicable
Headers show
Series [v17,01/12] block: Introduce queue limits and sysfs for copy-offload support | expand

Commit Message

Nitesh Shetty Oct. 19, 2023, 11:01 a.m. UTC
Add support for handling nvme_cmd_copy command on target.

For bdev-ns if backing device supports copy offload we call device copy
offload (blkdev_copy_offload).
In case of absence of device copy offload capability, we use copy emulation
(blkdev_copy_emulation)

For file-ns we call vfs_copy_file_range to service our request.

Currently target always shows copy capability by setting
NVME_CTRL_ONCS_COPY in controller ONCS.

loop target has copy support, which can be used to test copy offload.
trace event support for nvme_cmd_copy.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
---
 drivers/nvme/target/admin-cmd.c   |  9 +++-
 drivers/nvme/target/io-cmd-bdev.c | 71 +++++++++++++++++++++++++++++++
 drivers/nvme/target/io-cmd-file.c | 50 ++++++++++++++++++++++
 drivers/nvme/target/nvmet.h       |  1 +
 drivers/nvme/target/trace.c       | 19 +++++++++
 5 files changed, 148 insertions(+), 2 deletions(-)

Comments

kernel test robot Oct. 22, 2023, 11:51 a.m. UTC | #1
Hi Nitesh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 213f891525c222e8ed145ce1ce7ae1f47921cb9c]

url:    https://github.com/intel-lab-lkp/linux/commits/Nitesh-Shetty/block-Introduce-queue-limits-and-sysfs-for-copy-offload-support/20231019-200658
base:   213f891525c222e8ed145ce1ce7ae1f47921cb9c
patch link:    https://lore.kernel.org/r/20231019110147.31672-9-nj.shetty%40samsung.com
patch subject: [PATCH v17 08/12] nvmet: add copy command support for bdev and file ns
config: i386-randconfig-062-20231022 (https://download.01.org/0day-ci/archive/20231022/202310221915.PYH9XadG-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231022/202310221915.PYH9XadG-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310221915.PYH9XadG-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/nvme/target/io-cmd-bdev.c:498:30: sparse: sparse: restricted __le16 degrades to integer

vim +498 drivers/nvme/target/io-cmd-bdev.c

   478	
   479	/*
   480	 * At present we handle only one range entry, since copy offload is aligned with
   481	 * copy_file_range, only one entry is passed from block layer.
   482	 */
   483	static void nvmet_bdev_execute_copy(struct nvmet_req *rq)
   484	{
   485		struct nvme_copy_range range;
   486		struct nvme_command *cmd = rq->cmd;
   487		ssize_t ret;
   488		off_t dst, src;
   489	
   490		u16 status;
   491	
   492		status = nvmet_copy_from_sgl(rq, 0, &range, sizeof(range));
   493		if (status)
   494			goto err_rq_complete;
   495	
   496		dst = le64_to_cpu(cmd->copy.sdlba) << rq->ns->blksize_shift;
   497		src = le64_to_cpu(range.slba) << rq->ns->blksize_shift;
 > 498		rq->copy_len = (range.nlb + 1) << rq->ns->blksize_shift;
   499	
   500		if (bdev_max_copy_sectors(rq->ns->bdev)) {
   501			ret = blkdev_copy_offload(rq->ns->bdev, dst, src, rq->copy_len,
   502						  nvmet_bdev_copy_endio,
   503						  (void *)rq, GFP_KERNEL);
   504		} else {
   505			ret = blkdev_copy_emulation(rq->ns->bdev, dst,
   506						    rq->ns->bdev, src, rq->copy_len,
   507						    nvmet_bdev_copy_endio,
   508						    (void *)rq, GFP_KERNEL);
   509		}
   510		if (ret == -EIOCBQUEUED)
   511			return;
   512	
   513		rq->cqe->result.u32 = cpu_to_le32(0);
   514		status = errno_to_nvme_status(rq, ret);
   515	err_rq_complete:
   516		nvmet_req_complete(rq, status);
   517	}
   518
diff mbox series

Patch

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 39cb570f833d..4e1a6ca09937 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -433,8 +433,7 @@  static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 	id->nn = cpu_to_le32(NVMET_MAX_NAMESPACES);
 	id->mnan = cpu_to_le32(NVMET_MAX_NAMESPACES);
 	id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM |
-			NVME_CTRL_ONCS_WRITE_ZEROES);
-
+			NVME_CTRL_ONCS_WRITE_ZEROES | NVME_CTRL_ONCS_COPY);
 	/* XXX: don't report vwc if the underlying device is write through */
 	id->vwc = NVME_CTRL_VWC_PRESENT;
 
@@ -536,6 +535,12 @@  static void nvmet_execute_identify_ns(struct nvmet_req *req)
 
 	if (req->ns->bdev)
 		nvmet_bdev_set_limits(req->ns->bdev, id);
+	else {
+		id->msrc = (__force u8)to0based(BIO_MAX_VECS - 1);
+		id->mssrl = cpu_to_le16(BIO_MAX_VECS <<
+					(PAGE_SHIFT - SECTOR_SHIFT));
+		id->mcl = cpu_to_le32(le16_to_cpu(id->mssrl));
+	}
 
 	/*
 	 * We just provide a single LBA format that matches what the
diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c
index 468833675cc9..e51978514546 100644
--- a/drivers/nvme/target/io-cmd-bdev.c
+++ b/drivers/nvme/target/io-cmd-bdev.c
@@ -46,6 +46,18 @@  void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id)
 	id->npda = id->npdg;
 	/* NOWS = Namespace Optimal Write Size */
 	id->nows = to0based(bdev_io_opt(bdev) / bdev_logical_block_size(bdev));
+
+	if (bdev_max_copy_sectors(bdev)) {
+		id->msrc = id->msrc;
+		id->mssrl = cpu_to_le16((bdev_max_copy_sectors(bdev) <<
+				SECTOR_SHIFT) /	bdev_logical_block_size(bdev));
+		id->mcl = cpu_to_le32((__force u32)id->mssrl);
+	} else {
+		id->msrc = (__force u8)to0based(BIO_MAX_VECS - 1);
+		id->mssrl = cpu_to_le16((BIO_MAX_VECS << PAGE_SHIFT) /
+					bdev_logical_block_size(bdev));
+		id->mcl = cpu_to_le32((__force u32)id->mssrl);
+	}
 }
 
 void nvmet_bdev_ns_disable(struct nvmet_ns *ns)
@@ -449,6 +461,61 @@  static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req)
 	}
 }
 
+static void nvmet_bdev_copy_endio(void *private, int status,
+					    ssize_t copied)
+{
+	struct nvmet_req *rq = (struct nvmet_req *)private;
+	u16 nvme_status;
+
+	if (copied == rq->copy_len)
+		rq->cqe->result.u32 = cpu_to_le32(1);
+	else
+		rq->cqe->result.u32 = cpu_to_le32(0);
+
+	nvme_status = errno_to_nvme_status(rq, status);
+	nvmet_req_complete(rq, nvme_status);
+}
+
+/*
+ * At present we handle only one range entry, since copy offload is aligned with
+ * copy_file_range, only one entry is passed from block layer.
+ */
+static void nvmet_bdev_execute_copy(struct nvmet_req *rq)
+{
+	struct nvme_copy_range range;
+	struct nvme_command *cmd = rq->cmd;
+	ssize_t ret;
+	off_t dst, src;
+
+	u16 status;
+
+	status = nvmet_copy_from_sgl(rq, 0, &range, sizeof(range));
+	if (status)
+		goto err_rq_complete;
+
+	dst = le64_to_cpu(cmd->copy.sdlba) << rq->ns->blksize_shift;
+	src = le64_to_cpu(range.slba) << rq->ns->blksize_shift;
+	rq->copy_len = (range.nlb + 1) << rq->ns->blksize_shift;
+
+	if (bdev_max_copy_sectors(rq->ns->bdev)) {
+		ret = blkdev_copy_offload(rq->ns->bdev, dst, src, rq->copy_len,
+					  nvmet_bdev_copy_endio,
+					  (void *)rq, GFP_KERNEL);
+	} else {
+		ret = blkdev_copy_emulation(rq->ns->bdev, dst,
+					    rq->ns->bdev, src, rq->copy_len,
+					    nvmet_bdev_copy_endio,
+					    (void *)rq, GFP_KERNEL);
+	}
+	if (ret == -EIOCBQUEUED)
+		return;
+
+	rq->cqe->result.u32 = cpu_to_le32(0);
+	status = errno_to_nvme_status(rq, ret);
+err_rq_complete:
+	nvmet_req_complete(rq, status);
+}
+
 u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req)
 {
 	switch (req->cmd->common.opcode) {
@@ -467,6 +534,10 @@  u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req)
 	case nvme_cmd_write_zeroes:
 		req->execute = nvmet_bdev_execute_write_zeroes;
 		return 0;
+	case nvme_cmd_copy:
+		req->execute = nvmet_bdev_execute_copy;
+		return 0;
+
 	default:
 		return nvmet_report_invalid_opcode(req);
 	}
diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
index 2d068439b129..4524cfffa4c6 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -322,6 +322,47 @@  static void nvmet_file_dsm_work(struct work_struct *w)
 	}
 }
 
+static void nvmet_file_copy_work(struct work_struct *w)
+{
+	struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
+	int nr_range = req->cmd->copy.nr_range + 1;
+	u16 status = 0;
+	int src, id;
+	ssize_t len, ret;
+	loff_t pos;
+
+	pos = le64_to_cpu(req->cmd->copy.sdlba) << req->ns->blksize_shift;
+	if (unlikely(pos + req->transfer_len > req->ns->size)) {
+		nvmet_req_complete(req, errno_to_nvme_status(req, -ENOSPC));
+		return;
+	}
+
+	for (id = 0 ; id < nr_range; id++) {
+		struct nvme_copy_range range;
+
+		status = nvmet_copy_from_sgl(req, id * sizeof(range), &range,
+					     sizeof(range));
+		if (status)
+			break;
+
+		src = (le64_to_cpu(range.slba) << (req->ns->blksize_shift));
+		len = (le16_to_cpu(range.nlb) + 1) << (req->ns->blksize_shift);
+		ret = vfs_copy_file_range(req->ns->file, src, req->ns->file,
+					  pos, len, 0);
+		pos += ret;
+		if (ret != len) {
+			req->cqe->result.u32 = cpu_to_le32(id);
+			if (ret < 0)
+				status = errno_to_nvme_status(req, ret);
+			else
+				status = errno_to_nvme_status(req, -EIO);
+			break;
+		}
+	}
+
+	nvmet_req_complete(req, status);
+}
+
 static void nvmet_file_execute_dsm(struct nvmet_req *req)
 {
 	if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req)))
@@ -330,6 +371,12 @@  static void nvmet_file_execute_dsm(struct nvmet_req *req)
 	queue_work(nvmet_wq, &req->f.work);
 }
 
+static void nvmet_file_execute_copy(struct nvmet_req *req)
+{
+	INIT_WORK(&req->f.work, nvmet_file_copy_work);
+	queue_work(nvmet_wq, &req->f.work);
+}
+
 static void nvmet_file_write_zeroes_work(struct work_struct *w)
 {
 	struct nvmet_req *req = container_of(w, struct nvmet_req, f.work);
@@ -376,6 +423,9 @@  u16 nvmet_file_parse_io_cmd(struct nvmet_req *req)
 	case nvme_cmd_write_zeroes:
 		req->execute = nvmet_file_execute_write_zeroes;
 		return 0;
+	case nvme_cmd_copy:
+		req->execute = nvmet_file_execute_copy;
+		return 0;
 	default:
 		return nvmet_report_invalid_opcode(req);
 	}
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 8cfd60f3b564..395f3af28413 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -393,6 +393,7 @@  struct nvmet_req {
 	struct device		*p2p_client;
 	u16			error_loc;
 	u64			error_slba;
+	size_t			copy_len;
 };
 
 #define NVMET_MAX_MPOOL_BVEC		16
diff --git a/drivers/nvme/target/trace.c b/drivers/nvme/target/trace.c
index bff454d46255..551fdf029381 100644
--- a/drivers/nvme/target/trace.c
+++ b/drivers/nvme/target/trace.c
@@ -92,6 +92,23 @@  static const char *nvmet_trace_dsm(struct trace_seq *p, u8 *cdw10)
 	return ret;
 }
 
+static const char *nvmet_trace_copy(struct trace_seq *p, u8 *cdw10)
+{
+	const char *ret = trace_seq_buffer_ptr(p);
+	u64 sdlba = get_unaligned_le64(cdw10);
+	u8 nr_range = get_unaligned_le16(cdw10 + 8);
+	u16 control = get_unaligned_le16(cdw10 + 10);
+	u32 dsmgmt = get_unaligned_le32(cdw10 + 12);
+	u32 reftag = get_unaligned_le32(cdw10 +  16);
+
+	trace_seq_printf(p,
+		"sdlba=%llu, nr_range=%u, ctrl=1x%x, dsmgmt=%u, reftag=%u",
+		sdlba, nr_range, control, dsmgmt, reftag);
+	trace_seq_putc(p, 0);
+
+	return ret;
+}
+
 static const char *nvmet_trace_common(struct trace_seq *p, u8 *cdw10)
 {
 	const char *ret = trace_seq_buffer_ptr(p);
@@ -129,6 +146,8 @@  const char *nvmet_trace_parse_nvm_cmd(struct trace_seq *p,
 		return nvmet_trace_read_write(p, cdw10);
 	case nvme_cmd_dsm:
 		return nvmet_trace_dsm(p, cdw10);
+	case nvme_cmd_copy:
+		return nvmet_trace_copy(p, cdw10);
 	default:
 		return nvmet_trace_common(p, cdw10);
 	}