diff mbox series

[v8,6/9] nvmet: add copy command support for bdev and file ns

Message ID 20230327084103.21601-7-anuj20.g@samsung.com (mailing list archive)
State Mainlined, archived
Headers show
Series Implement copy offload support | expand

Commit Message

Anuj Gupta March 27, 2023, 8:40 a.m. UTC 
From: Nitesh Shetty <nj.shetty@samsung.com>

Add support for handling target command on target.
For bdev-ns we call into blkdev_issue_copy, which the block layer
completes by a offloaded copy request to backend bdev or by emulating the
request.

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.

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 | 58 +++++++++++++++++++++++++++++++
 drivers/nvme/target/io-cmd-file.c | 52 +++++++++++++++++++++++++++
 drivers/nvme/target/loop.c        |  6 ++++
 drivers/nvme/target/nvmet.h       |  1 +
 5 files changed, 124 insertions(+), 2 deletions(-)

Comments

kernel test robot March 29, 2023, 1:56 p.m. UTC | #1 
Hi Anuj,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on axboe-block/for-next]
[also build test WARNING on linus/master v6.3-rc4 next-20230329]
[cannot apply to device-mapper-dm/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Anuj-Gupta/block-Add-copy-offload-support-infrastructure/20230329-162018
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
patch link:    https://lore.kernel.org/r/20230327084103.21601-7-anuj20.g%40samsung.com
patch subject: [PATCH v8 6/9] nvmet: add copy command support for bdev and file ns
config: arm64-randconfig-s041-20230329 (https://download.01.org/0day-ci/archive/20230329/202303292148.Pbx4mDpS-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/f846a8ac40882d9d42532e9e2b43560650ef8510
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Anuj-Gupta/block-Add-copy-offload-support-infrastructure/20230329-162018
        git checkout f846a8ac40882d9d42532e9e2b43560650ef8510
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/nvme/target/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303292148.Pbx4mDpS-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/nvme/target/io-cmd-bdev.c:55:27: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected unsigned int [usertype] val @@     got restricted __le16 [usertype] mssrl @@
   drivers/nvme/target/io-cmd-bdev.c:55:27: sparse:     expected unsigned int [usertype] val
   drivers/nvme/target/io-cmd-bdev.c:55:27: sparse:     got restricted __le16 [usertype] mssrl
>> drivers/nvme/target/io-cmd-bdev.c:55:27: sparse: sparse: cast from restricted __le16
>> drivers/nvme/target/io-cmd-bdev.c:55:27: sparse: sparse: cast from restricted __le16
>> drivers/nvme/target/io-cmd-bdev.c:55:27: sparse: sparse: cast from restricted __le16
>> drivers/nvme/target/io-cmd-bdev.c:55:27: sparse: sparse: cast from restricted __le16
   drivers/nvme/target/io-cmd-bdev.c:57:29: sparse: sparse: cast from restricted __le16
   drivers/nvme/target/io-cmd-bdev.c:60:27: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected unsigned int [usertype] val @@     got restricted __le16 [usertype] mssrl @@
   drivers/nvme/target/io-cmd-bdev.c:60:27: sparse:     expected unsigned int [usertype] val
   drivers/nvme/target/io-cmd-bdev.c:60:27: sparse:     got restricted __le16 [usertype] mssrl
   drivers/nvme/target/io-cmd-bdev.c:60:27: sparse: sparse: cast from restricted __le16
   drivers/nvme/target/io-cmd-bdev.c:60:27: sparse: sparse: cast from restricted __le16
   drivers/nvme/target/io-cmd-bdev.c:60:27: sparse: sparse: cast from restricted __le16
   drivers/nvme/target/io-cmd-bdev.c:60:27: sparse: sparse: cast from restricted __le16

vim +55 drivers/nvme/target/io-cmd-bdev.c

    12	
    13	void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id)
    14	{
    15		/* Logical blocks per physical block, 0's based. */
    16		const __le16 lpp0b = to0based(bdev_physical_block_size(bdev) /
    17					      bdev_logical_block_size(bdev));
    18	
    19		/*
    20		 * For NVMe 1.2 and later, bit 1 indicates that the fields NAWUN,
    21		 * NAWUPF, and NACWU are defined for this namespace and should be
    22		 * used by the host for this namespace instead of the AWUN, AWUPF,
    23		 * and ACWU fields in the Identify Controller data structure. If
    24		 * any of these fields are zero that means that the corresponding
    25		 * field from the identify controller data structure should be used.
    26		 */
    27		id->nsfeat |= 1 << 1;
    28		id->nawun = lpp0b;
    29		id->nawupf = lpp0b;
    30		id->nacwu = lpp0b;
    31	
    32		/*
    33		 * Bit 4 indicates that the fields NPWG, NPWA, NPDG, NPDA, and
    34		 * NOWS are defined for this namespace and should be used by
    35		 * the host for I/O optimization.
    36		 */
    37		id->nsfeat |= 1 << 4;
    38		/* NPWG = Namespace Preferred Write Granularity. 0's based */
    39		id->npwg = lpp0b;
    40		/* NPWA = Namespace Preferred Write Alignment. 0's based */
    41		id->npwa = id->npwg;
    42		/* NPDG = Namespace Preferred Deallocate Granularity. 0's based */
    43		id->npdg = to0based(bdev_discard_granularity(bdev) /
    44				    bdev_logical_block_size(bdev));
    45		/* NPDG = Namespace Preferred Deallocate Alignment */
    46		id->npda = id->npdg;
    47		/* NOWS = Namespace Optimal Write Size */
    48		id->nows = to0based(bdev_io_opt(bdev) / bdev_logical_block_size(bdev));
    49	
    50		/*Copy limits*/
    51		if (bdev_max_copy_sectors(bdev)) {
    52			id->msrc = id->msrc;
    53			id->mssrl = cpu_to_le16((bdev_max_copy_sectors(bdev) <<
    54					SECTOR_SHIFT) / bdev_logical_block_size(bdev));
  > 55			id->mcl = cpu_to_le32(id->mssrl);
    56		} else {
    57			id->msrc = (u8)to0based(BIO_MAX_VECS - 1);
    58			id->mssrl = cpu_to_le16((BIO_MAX_VECS << PAGE_SHIFT) /
    59					bdev_logical_block_size(bdev));
    60			id->mcl = cpu_to_le32(id->mssrl);
    61		}
    62	}
    63
kernel test robot March 29, 2023, 6:36 p.m. UTC | #2 
Hi Anuj,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on axboe-block/for-next]
[also build test WARNING on linus/master v6.3-rc4 next-20230329]
[cannot apply to device-mapper-dm/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Anuj-Gupta/block-Add-copy-offload-support-infrastructure/20230329-162018
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
patch link:    https://lore.kernel.org/r/20230327084103.21601-7-anuj20.g%40samsung.com
patch subject: [PATCH v8 6/9] nvmet: add copy command support for bdev and file ns
config: arm64-randconfig-s041-20230329 (https://download.01.org/0day-ci/archive/20230330/202303300238.vmt9ne37-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/f846a8ac40882d9d42532e9e2b43560650ef8510
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Anuj-Gupta/block-Add-copy-offload-support-infrastructure/20230329-162018
        git checkout f846a8ac40882d9d42532e9e2b43560650ef8510
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/nvme/target/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303300238.vmt9ne37-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/nvme/target/admin-cmd.c:539:29: sparse: sparse: cast from restricted __le16

vim +539 drivers/nvme/target/admin-cmd.c

   490	
   491	static void nvmet_execute_identify_ns(struct nvmet_req *req)
   492	{
   493		struct nvme_id_ns *id;
   494		u16 status;
   495	
   496		if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
   497			req->error_loc = offsetof(struct nvme_identify, nsid);
   498			status = NVME_SC_INVALID_NS | NVME_SC_DNR;
   499			goto out;
   500		}
   501	
   502		id = kzalloc(sizeof(*id), GFP_KERNEL);
   503		if (!id) {
   504			status = NVME_SC_INTERNAL;
   505			goto out;
   506		}
   507	
   508		/* return an all zeroed buffer if we can't find an active namespace */
   509		status = nvmet_req_find_ns(req);
   510		if (status) {
   511			status = 0;
   512			goto done;
   513		}
   514	
   515		if (nvmet_ns_revalidate(req->ns)) {
   516			mutex_lock(&req->ns->subsys->lock);
   517			nvmet_ns_changed(req->ns->subsys, req->ns->nsid);
   518			mutex_unlock(&req->ns->subsys->lock);
   519		}
   520	
   521		/*
   522		 * nuse = ncap = nsze isn't always true, but we have no way to find
   523		 * that out from the underlying device.
   524		 */
   525		id->ncap = id->nsze =
   526			cpu_to_le64(req->ns->size >> req->ns->blksize_shift);
   527		switch (req->port->ana_state[req->ns->anagrpid]) {
   528		case NVME_ANA_INACCESSIBLE:
   529		case NVME_ANA_PERSISTENT_LOSS:
   530			break;
   531		default:
   532			id->nuse = id->nsze;
   533			break;
   534		}
   535	
   536		if (req->ns->bdev)
   537			nvmet_bdev_set_limits(req->ns->bdev, id);
   538		else {
 > 539			id->msrc = (u8)to0based(BIO_MAX_VECS - 1);
   540			id->mssrl = cpu_to_le16(BIO_MAX_VECS <<
   541					(PAGE_SHIFT - SECTOR_SHIFT));
   542			id->mcl = cpu_to_le32(le16_to_cpu(id->mssrl));
   543		}
   544	
   545		/*
   546		 * We just provide a single LBA format that matches what the
   547		 * underlying device reports.
   548		 */
   549		id->nlbaf = 0;
   550		id->flbas = 0;
   551	
   552		/*
   553		 * Our namespace might always be shared.  Not just with other
   554		 * controllers, but also with any other user of the block device.
   555		 */
   556		id->nmic = NVME_NS_NMIC_SHARED;
   557		id->anagrpid = cpu_to_le32(req->ns->anagrpid);
   558	
   559		memcpy(&id->nguid, &req->ns->nguid, sizeof(id->nguid));
   560	
   561		id->lbaf[0].ds = req->ns->blksize_shift;
   562	
   563		if (req->sq->ctrl->pi_support && nvmet_ns_has_pi(req->ns)) {
   564			id->dpc = NVME_NS_DPC_PI_FIRST | NVME_NS_DPC_PI_LAST |
   565				  NVME_NS_DPC_PI_TYPE1 | NVME_NS_DPC_PI_TYPE2 |
   566				  NVME_NS_DPC_PI_TYPE3;
   567			id->mc = NVME_MC_EXTENDED_LBA;
   568			id->dps = req->ns->pi_type;
   569			id->flbas = NVME_NS_FLBAS_META_EXT;
   570			id->lbaf[0].ms = cpu_to_le16(req->ns->metadata_size);
   571		}
   572	
   573		if (req->ns->readonly)
   574			id->nsattr |= NVME_NS_ATTR_RO;
   575	done:
   576		if (!status)
   577			status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
   578	
   579		kfree(id);
   580	out:
   581		nvmet_req_complete(req, status);
   582	}
   583
diff mbox series

Patch

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 80099df37314..978786ec6a9e 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 = (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 c2d6cea0236b..0af273097aa4 100644
--- a/drivers/nvme/target/io-cmd-bdev.c
+++ b/drivers/nvme/target/io-cmd-bdev.c
@@ -46,6 +46,19 @@  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));
+
+	/*Copy limits*/
+	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(id->mssrl);
+	} else {
+		id->msrc = (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(id->mssrl);
+	}
 }
 
 void nvmet_bdev_ns_disable(struct nvmet_ns *ns)
@@ -184,6 +197,19 @@  static void nvmet_bio_done(struct bio *bio)
 	nvmet_req_bio_put(req, bio);
 }
 
+static void nvmet_bdev_copy_end_io(void *private, int comp_len)
+{
+	struct nvmet_req *req = (struct nvmet_req *)private;
+
+	if (comp_len == req->copy_len) {
+		req->cqe->result.u32 = cpu_to_le32(1);
+		nvmet_req_complete(req, errno_to_nvme_status(req, 0));
+	} else {
+		req->cqe->result.u32 = cpu_to_le32(0);
+		nvmet_req_complete(req, blk_to_nvme_status(req, BLK_STS_IOERR));
+	}
+}
+
 #ifdef CONFIG_BLK_DEV_INTEGRITY
 static int nvmet_bdev_alloc_bip(struct nvmet_req *req, struct bio *bio,
 				struct sg_mapping_iter *miter)
@@ -450,6 +476,34 @@  static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req)
 	}
 }
 
+/* At present we handle only one range entry */
+static void nvmet_bdev_execute_copy(struct nvmet_req *req)
+{
+	struct nvme_copy_range range;
+	struct nvme_command *cmnd = req->cmd;
+	int ret;
+
+
+	ret = nvmet_copy_from_sgl(req, 0, &range, sizeof(range));
+	if (ret)
+		goto out;
+
+	ret = blkdev_issue_copy(req->ns->bdev,
+		le64_to_cpu(cmnd->copy.sdlba) << req->ns->blksize_shift,
+		req->ns->bdev,
+		le64_to_cpu(range.slba) << req->ns->blksize_shift,
+		(le16_to_cpu(range.nlb) + 1) << req->ns->blksize_shift,
+		nvmet_bdev_copy_end_io, (void *)req, GFP_KERNEL);
+	if (ret) {
+		req->cqe->result.u32 = cpu_to_le32(0);
+		nvmet_req_complete(req, blk_to_nvme_status(req, BLK_STS_IOERR));
+	}
+
+	return;
+out:
+	nvmet_req_complete(req, errno_to_nvme_status(req, ret));
+}
+
 u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req)
 {
 	switch (req->cmd->common.opcode) {
@@ -468,6 +522,10 @@  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..69f198ecec77 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -322,6 +322,49 @@  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;
+	loff_t pos;
+	struct nvme_command *cmnd = req->cmd;
+	int ret = 0, len = 0, src, id;
+
+	nr_range = cmnd->copy.nr_range + 1;
+	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;
+
+		ret = nvmet_copy_from_sgl(req, id * sizeof(range), &range,
+					sizeof(range));
+		if (ret)
+			goto out;
+
+		len = (le16_to_cpu(range.nlb) + 1) << (req->ns->blksize_shift);
+		src = (le64_to_cpu(range.slba) << (req->ns->blksize_shift));
+		ret = vfs_copy_file_range(req->ns->file, src, req->ns->file,
+					pos, len, 0);
+out:
+		if (ret != len) {
+			pos += ret;
+			req->cqe->result.u32 = cpu_to_le32(id);
+			nvmet_req_complete(req, ret < 0 ?
+					errno_to_nvme_status(req, ret) :
+					errno_to_nvme_status(req, -EIO));
+			return;
+
+		} else
+			pos += len;
+	}
+
+	nvmet_req_complete(req, 0);
+
+}
 static void nvmet_file_execute_dsm(struct nvmet_req *req)
 {
 	if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req)))
@@ -330,6 +373,12 @@  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 +425,9 @@  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/loop.c b/drivers/nvme/target/loop.c
index f2d24b2d992f..d18ed8067a15 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -146,6 +146,12 @@  static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
 		return ret;
 
 	nvme_start_request(req);
+	if (unlikely((req->cmd_flags & REQ_COPY) &&
+				(req_op(req) == REQ_OP_READ))) {
+		blk_mq_set_request_complete(req);
+		blk_mq_end_request(req, BLK_STS_OK);
+		return BLK_STS_OK;
+	}
 	iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
 	iod->req.port = queue->ctrl->port;
 	if (!nvmet_req_init(&iod->req, &queue->nvme_cq,
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 89bedfcd974c..69ed4c8469e5 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