diff mbox series

[v4,06/10] nvmet: add copy command support for bdev and file ns

Message ID 20220426101241.30100-7-nj.shetty@samsung.com (mailing list archive)
State New, archived
Headers show
Series Add Copy offload support | expand

Commit Message

Nitesh Shetty April 26, 2022, 10:12 a.m. UTC 
From: Arnav Dawn <arnav.dawn@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: Arnav Dawn <arnav.dawn@samsung.com>
Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
---
 drivers/nvme/host/tcp.c           |  2 +-
 drivers/nvme/target/admin-cmd.c   |  8 +++-
 drivers/nvme/target/io-cmd-bdev.c | 65 +++++++++++++++++++++++++++++++
 drivers/nvme/target/io-cmd-file.c | 49 +++++++++++++++++++++++
 4 files changed, 121 insertions(+), 3 deletions(-)

Comments

kernel test robot April 28, 2022, 2:53 p.m. UTC | #1 
Hi Nitesh,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20220422]
[cannot apply to axboe-block/for-next device-mapper-dm/for-next linus/master v5.18-rc4 v5.18-rc3 v5.18-rc2 v5.18-rc4]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Nitesh-Shetty/block-Introduce-queue-limits-for-copy-offload-support/20220426-201825
base:    e7d6987e09a328d4a949701db40ef63fbb970670
config: s390-randconfig-s032-20220427 (https://download.01.org/0day-ci/archive/20220428/202204282248.B5VfX8LS-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 11.3.0
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-dirty
        # https://github.com/intel-lab-lkp/linux/commit/6a9ea8570c34a7222786ca4d129578f48426d2f2
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Nitesh-Shetty/block-Introduce-queue-limits-for-copy-offload-support/20220426-201825
        git checkout 6a9ea8570c34a7222786ca4d129578f48426d2f2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash drivers/md/ drivers/nvme/target/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/nvme/target/io-cmd-bdev.c:56:26: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned char [usertype] msrc @@     got restricted __le16 @@
   drivers/nvme/target/io-cmd-bdev.c:56:26: sparse:     expected unsigned char [usertype] msrc
   drivers/nvme/target/io-cmd-bdev.c:56:26: sparse:     got restricted __le16
   drivers/nvme/target/io-cmd-bdev.c:59:34: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned char [usertype] msrc @@     got restricted __le16 @@
   drivers/nvme/target/io-cmd-bdev.c:59:34: sparse:     expected unsigned char [usertype] msrc
   drivers/nvme/target/io-cmd-bdev.c:59:34: sparse:     got restricted __le16
--
>> drivers/nvme/target/admin-cmd.c:537:26: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned char [usertype] msrc @@     got restricted __le16 @@
   drivers/nvme/target/admin-cmd.c:537:26: sparse:     expected unsigned char [usertype] msrc
   drivers/nvme/target/admin-cmd.c:537:26: sparse:     got restricted __le16

vim +56 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		const struct queue_limits *ql = &bdev_get_queue(bdev)->limits;
    16		/* Number of logical blocks per physical block. */
    17		const u32 lpp = ql->physical_block_size / ql->logical_block_size;
    18		/* Logical blocks per physical block, 0's based. */
    19		const __le16 lpp0b = to0based(lpp);
    20	
    21		/*
    22		 * For NVMe 1.2 and later, bit 1 indicates that the fields NAWUN,
    23		 * NAWUPF, and NACWU are defined for this namespace and should be
    24		 * used by the host for this namespace instead of the AWUN, AWUPF,
    25		 * and ACWU fields in the Identify Controller data structure. If
    26		 * any of these fields are zero that means that the corresponding
    27		 * field from the identify controller data structure should be used.
    28		 */
    29		id->nsfeat |= 1 << 1;
    30		id->nawun = lpp0b;
    31		id->nawupf = lpp0b;
    32		id->nacwu = lpp0b;
    33	
    34		/*
    35		 * Bit 4 indicates that the fields NPWG, NPWA, NPDG, NPDA, and
    36		 * NOWS are defined for this namespace and should be used by
    37		 * the host for I/O optimization.
    38		 */
    39		id->nsfeat |= 1 << 4;
    40		/* NPWG = Namespace Preferred Write Granularity. 0's based */
    41		id->npwg = lpp0b;
    42		/* NPWA = Namespace Preferred Write Alignment. 0's based */
    43		id->npwa = id->npwg;
    44		/* NPDG = Namespace Preferred Deallocate Granularity. 0's based */
    45		id->npdg = to0based(ql->discard_granularity / ql->logical_block_size);
    46		/* NPDG = Namespace Preferred Deallocate Alignment */
    47		id->npda = id->npdg;
    48		/* NOWS = Namespace Optimal Write Size */
    49		id->nows = to0based(ql->io_opt / ql->logical_block_size);
    50	
    51		/*Copy limits*/
    52		if (ql->max_copy_sectors) {
    53			id->mcl = cpu_to_le32((ql->max_copy_sectors << 9) / ql->logical_block_size);
    54			id->mssrl = cpu_to_le16((ql->max_copy_range_sectors << 9) /
    55					ql->logical_block_size);
  > 56			id->msrc = to0based(ql->max_copy_nr_ranges);
    57		} else {
    58			if (ql->zoned == BLK_ZONED_NONE) {
    59				id->msrc = to0based(BIO_MAX_VECS);
    60				id->mssrl = cpu_to_le16(
    61						(BIO_MAX_VECS << PAGE_SHIFT) / ql->logical_block_size);
    62				id->mcl = cpu_to_le32(le16_to_cpu(id->mssrl) * BIO_MAX_VECS);
    63	#ifdef CONFIG_BLK_DEV_ZONED
    64			} else {
    65				/* TODO: get right values for zoned device */
    66				id->msrc = to0based(BIO_MAX_VECS);
    67				id->mssrl = cpu_to_le16(min((BIO_MAX_VECS << PAGE_SHIFT),
    68						ql->chunk_sectors) / ql->logical_block_size);
    69				id->mcl = cpu_to_le32(min(le16_to_cpu(id->mssrl) * BIO_MAX_VECS,
    70							ql->chunk_sectors));
    71	#endif
    72			}
    73		}
    74	}
    75
diff mbox series

Patch

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 4e4cdcf8210a..2c77e5b596bb 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -2395,7 +2395,7 @@  static blk_status_t nvme_tcp_setup_cmd_pdu(struct nvme_ns *ns,
 		return ret;
 
 	if (unlikely((rq->cmd_flags & REQ_COPY) && (req_op(rq) == REQ_OP_READ))) {
-		blk_mq_start_request(req);
+		blk_mq_start_request(rq);
 		return BLK_STS_OK;
 	}
 
diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 397daaf51f1b..db32debdb528 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -431,8 +431,7 @@  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;
 
@@ -534,6 +533,11 @@  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 = to0based(BIO_MAX_VECS);
+		id->mssrl = cpu_to_le16(BIO_MAX_VECS << (PAGE_SHIFT - SECTOR_SHIFT));
+		id->mcl = cpu_to_le32(le16_to_cpu(id->mssrl) * BIO_MAX_VECS);
+	}
 
 	/*
 	 * 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 27a72504d31c..18666d36423f 100644
--- a/drivers/nvme/target/io-cmd-bdev.c
+++ b/drivers/nvme/target/io-cmd-bdev.c
@@ -47,6 +47,30 @@  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(ql->io_opt / ql->logical_block_size);
+
+	/*Copy limits*/
+	if (ql->max_copy_sectors) {
+		id->mcl = cpu_to_le32((ql->max_copy_sectors << 9) / ql->logical_block_size);
+		id->mssrl = cpu_to_le16((ql->max_copy_range_sectors << 9) /
+				ql->logical_block_size);
+		id->msrc = to0based(ql->max_copy_nr_ranges);
+	} else {
+		if (ql->zoned == BLK_ZONED_NONE) {
+			id->msrc = to0based(BIO_MAX_VECS);
+			id->mssrl = cpu_to_le16(
+					(BIO_MAX_VECS << PAGE_SHIFT) / ql->logical_block_size);
+			id->mcl = cpu_to_le32(le16_to_cpu(id->mssrl) * BIO_MAX_VECS);
+#ifdef CONFIG_BLK_DEV_ZONED
+		} else {
+			/* TODO: get right values for zoned device */
+			id->msrc = to0based(BIO_MAX_VECS);
+			id->mssrl = cpu_to_le16(min((BIO_MAX_VECS << PAGE_SHIFT),
+					ql->chunk_sectors) / ql->logical_block_size);
+			id->mcl = cpu_to_le32(min(le16_to_cpu(id->mssrl) * BIO_MAX_VECS,
+						ql->chunk_sectors));
+#endif
+		}
+	}
 }
 
 void nvmet_bdev_ns_disable(struct nvmet_ns *ns)
@@ -442,6 +466,43 @@  static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req)
 	}
 }
 
+static void nvmet_bdev_execute_copy(struct nvmet_req *req)
+{
+	struct nvme_copy_range range;
+	struct range_entry *rlist;
+	struct nvme_command *cmnd = req->cmd;
+	sector_t dest, dest_off = 0;
+	int ret, id, nr_range;
+
+	nr_range = cmnd->copy.nr_range + 1;
+	dest = le64_to_cpu(cmnd->copy.sdlba) << req->ns->blksize_shift;
+	rlist = kmalloc_array(nr_range, sizeof(*rlist), GFP_KERNEL);
+
+	for (id = 0 ; id < nr_range; id++) {
+		ret = nvmet_copy_from_sgl(req, id * sizeof(range), &range, sizeof(range));
+		if (ret)
+			goto out;
+
+		rlist[id].dst = dest + dest_off;
+		rlist[id].src = le64_to_cpu(range.slba) << req->ns->blksize_shift;
+		rlist[id].len = (le16_to_cpu(range.nlb) + 1) << req->ns->blksize_shift;
+		rlist[id].comp_len = 0;
+		dest_off += rlist[id].len;
+	}
+	ret = blkdev_issue_copy(req->ns->bdev, nr_range, rlist, req->ns->bdev, GFP_KERNEL);
+	if (ret) {
+		for (id = 0 ; id < nr_range; id++) {
+			if (rlist[id].len != rlist[id].comp_len) {
+				req->cqe->result.u32 = cpu_to_le32(id);
+				break;
+			}
+		}
+	}
+out:
+	kfree(rlist);
+	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) {
@@ -460,6 +521,10 @@  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 f3d58abf11e0..fe26a9120436 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -338,6 +338,46 @@  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, ret);
+
+}
 static void nvmet_file_execute_dsm(struct nvmet_req *req)
 {
 	if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req)))
@@ -346,6 +386,12 @@  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);
+	schedule_work(&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);
@@ -392,6 +438,9 @@  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);
 	}