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@xxxxxxxxxxx>
Signed-off-by: Anuj Gupta <anuj20.g@xxxxxxxxxxx>
---
drivers/nvme/target/admin-cmd.c | 9 +++-
drivers/nvme/target/io-cmd-bdev.c | 79 +++++++++++++++++++++++++++++++
drivers/nvme/target/io-cmd-file.c | 51 ++++++++++++++++++++
drivers/nvme/target/loop.c | 6 +++
drivers/nvme/target/nvmet.h | 2 +
5 files changed, 145 insertions(+), 2 deletions(-)
diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index c8a061ce3ee5..5ae509ff4b19 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 +533,12 @@ 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..01f0160125fb 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 +197,23 @@ static void nvmet_bio_done(struct bio *bio)
nvmet_req_bio_put(req, bio);
}
+static void nvmet_bdev_copy_end_io(void *private, int status)
+{
+ struct nvmet_req *req = (struct nvmet_req *)private;
+ int id;
+
+ if (status) {
+ for (id = 0 ; id < req->nr_range; id++) {
+ if (req->ranges[id].len != req->ranges[id].comp_len) {
+ req->cqe->result.u32 = cpu_to_le32(id);
+ break;
+ }
+ }
+ }
+ kfree(req->ranges);
+ nvmet_req_complete(req, errno_to_nvme_status(req, status));
+}
+
#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 +480,51 @@ 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 *ranges;
+ 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;
+ ranges = kmalloc_array(nr_range, sizeof(*ranges), 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;
+
+ ranges[id].dst = dest + dest_off;
+ ranges[id].src = le64_to_cpu(range.slba) <<
+ req->ns->blksize_shift;
+ ranges[id].len = (le16_to_cpu(range.nlb) + 1) <<
+ req->ns->blksize_shift;
+ ranges[id].comp_len = 0;
+ dest_off += ranges[id].len;
+ }
+ req->ranges = ranges;
+ req->nr_range = nr_range;
+ ret = blkdev_issue_copy(req->ns->bdev, req->ns->bdev, ranges, nr_range,
+ nvmet_bdev_copy_end_io, (void *)req, GFP_KERNEL);
+ if (ret) {
+ for (id = 0 ; id < nr_range; id++) {
+ if (ranges[id].len != ranges[id].comp_len) {
+ req->cqe->result.u32 = cpu_to_le32(id);
+ break;
+ }
+ }
+ goto out;
+ } else
+ return;
+out:
+ kfree(ranges);
+ 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 +543,10 @@ 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 64b47e2a4633..a81d38796e17 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -338,6 +338,48 @@ 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 +388,12 @@ 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);
@@ -392,6 +440,9 @@ 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 b45fe3adf015..55802632b407 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;
blk_mq_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 dfe3894205aa..3b4c7d2ee45d 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -391,6 +391,8 @@ struct nvmet_req {
struct device *p2p_client;
u16 error_loc;
u64 error_slba;
+ struct range_entry *ranges;
+ unsigned int nr_range;
};
extern struct workqueue_struct *buffered_io_wq;
--
2.35.1.500.gb896f729e2
--
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