[PATCH V3 2/9] nvmet: add ZNS support for bdev-ns
Chaitanya Kulkarni
chaitanya.kulkarni at wdc.com
Mon Nov 30 23:14:09 EST 2020
Add zns-bdev-config, id-ctrl, id-ns, zns-cmd-effects, zone-mgmt-send,
zone-mgmt-recv and zone-append handlers for NVMeOF target to enable ZNS
support for bdev.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
---
drivers/nvme/target/Makefile | 2 +-
drivers/nvme/target/admin-cmd.c | 4 +-
drivers/nvme/target/io-cmd-file.c | 2 +-
drivers/nvme/target/nvmet.h | 19 ++
drivers/nvme/target/zns.c | 426 ++++++++++++++++++++++++++++++
5 files changed, 449 insertions(+), 4 deletions(-)
create mode 100644 drivers/nvme/target/zns.c
diff --git a/drivers/nvme/target/Makefile b/drivers/nvme/target/Makefile
index ebf91fc4c72e..d050f829b43a 100644
--- a/drivers/nvme/target/Makefile
+++ b/drivers/nvme/target/Makefile
@@ -10,7 +10,7 @@ obj-$(CONFIG_NVME_TARGET_FCLOOP) += nvme-fcloop.o
obj-$(CONFIG_NVME_TARGET_TCP) += nvmet-tcp.o
nvmet-y += core.o configfs.o admin-cmd.o fabrics-cmd.o \
- discovery.o io-cmd-file.o io-cmd-bdev.o
+ zns.o discovery.o io-cmd-file.o io-cmd-bdev.o
nvmet-$(CONFIG_NVME_TARGET_PASSTHRU) += passthru.o
nvme-loop-y += loop.o
nvmet-rdma-y += rdma.o
diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index dca34489a1dc..509fd8dcca0c 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -579,8 +579,8 @@ static void nvmet_execute_identify_nslist(struct nvmet_req *req)
nvmet_req_complete(req, status);
}
-static u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
- void *id, off_t *off)
+u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
+ void *id, off_t *off)
{
struct nvme_ns_id_desc desc = {
.nidt = type,
diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
index 0abbefd9925e..2bd10960fa50 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -89,7 +89,7 @@ int nvmet_file_ns_enable(struct nvmet_ns *ns)
return ret;
}
-static void nvmet_file_init_bvec(struct bio_vec *bv, struct scatterlist *sg)
+void nvmet_file_init_bvec(struct bio_vec *bv, struct scatterlist *sg)
{
bv->bv_page = sg_page(sg);
bv->bv_offset = sg->offset;
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 592763732065..eee7866ae512 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -81,6 +81,10 @@ struct nvmet_ns {
struct pci_dev *p2p_dev;
int pi_type;
int metadata_size;
+#ifdef CONFIG_BLK_DEV_ZONED
+ struct nvme_id_ns_zns id_zns;
+ unsigned int zasl;
+#endif
};
static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)
@@ -251,6 +255,10 @@ struct nvmet_subsys {
unsigned int admin_timeout;
unsigned int io_timeout;
#endif /* CONFIG_NVME_TARGET_PASSTHRU */
+
+#ifdef CONFIG_BLK_DEV_ZONED
+ struct nvme_id_ctrl_zns id_ctrl_zns;
+#endif
};
static inline struct nvmet_subsys *to_subsys(struct config_item *item)
@@ -603,4 +611,15 @@ static inline bool nvmet_ns_has_pi(struct nvmet_ns *ns)
return ns->pi_type && ns->metadata_size == sizeof(struct t10_pi_tuple);
}
+void nvmet_execute_identify_cns_cs_ctrl(struct nvmet_req *req);
+void nvmet_execute_identify_cns_cs_ns(struct nvmet_req *req);
+u16 nvmet_process_zns_cis(struct nvmet_req *req, off_t *off);
+bool nvmet_bdev_zns_enable(struct nvmet_ns *ns);
+void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req);
+void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req);
+void nvmet_bdev_execute_zone_append(struct nvmet_req *req);
+void nvmet_zns_add_cmd_effects(struct nvme_effects_log *log);
+u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
+ void *id, off_t *off);
+void nvmet_file_init_bvec(struct bio_vec *bv, struct scatterlist *sg);
#endif /* _NVMET_H */
diff --git a/drivers/nvme/target/zns.c b/drivers/nvme/target/zns.c
new file mode 100644
index 000000000000..f6927f7ef4d2
--- /dev/null
+++ b/drivers/nvme/target/zns.c
@@ -0,0 +1,426 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NVMe ZNS-ZBD command implementation.
+ * Copyright (c) 2020-2021 HGST, a Western Digital Company.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/uio.h>
+#include <linux/nvme.h>
+#include <linux/xarray.h>
+#include <linux/blkdev.h>
+#include <linux/module.h>
+#include "nvmet.h"
+
+#ifdef CONFIG_BLK_DEV_ZONED
+#define NVMET_MPSMIN_SHIFT 12
+
+static u16 nvmet_bdev_zns_checks(struct nvmet_req *req)
+{
+ u16 status = 0;
+
+ if (!bdev_is_zoned(req->ns->bdev)) {
+ status = NVME_SC_INVALID_NS | NVME_SC_DNR;
+ goto out;
+ }
+
+ if (req->cmd->zmr.zra != NVME_ZRA_ZONE_REPORT) {
+ status = NVME_SC_INVALID_FIELD;
+ goto out;
+ }
+
+ if (req->cmd->zmr.zrasf != NVME_ZRASF_ZONE_REPORT_ALL) {
+ status = NVME_SC_INVALID_FIELD;
+ goto out;
+ }
+
+ if (req->cmd->zmr.pr != NVME_REPORT_ZONE_PARTIAL)
+ status = NVME_SC_INVALID_FIELD;
+out:
+ return status;
+}
+
+static inline struct block_device *nvmet_bdev(struct nvmet_req *req)
+{
+ return req->ns->bdev;
+}
+
+static inline u64 nvmet_sect_to_lba(struct nvmet_ns *ns, sector_t sect)
+{
+ return sect >> (ns->blksize_shift - SECTOR_SHIFT);
+}
+
+static inline sector_t nvmet_lba_to_sect(struct nvmet_ns *ns, __le64 lba)
+{
+ return le64_to_cpu(lba) << (ns->blksize_shift - SECTOR_SHIFT);
+}
+
+/*
+ * ZNS related command implementation and helpers.
+ */
+
+u16 nvmet_process_zns_cis(struct nvmet_req *req, off_t *off)
+{
+ u16 nvme_cis_zns = NVME_CSI_ZNS;
+
+ if (!bdev_is_zoned(nvmet_bdev(req)))
+ return NVME_SC_SUCCESS;
+
+ return nvmet_copy_ns_identifier(req, NVME_NIDT_CSI, NVME_NIDT_CSI_LEN,
+ &nvme_cis_zns, off);
+}
+
+void nvmet_zns_add_cmd_effects(struct nvme_effects_log *log)
+{
+ log->iocs[nvme_cmd_zone_append] = cpu_to_le32(1 << 0);
+ log->iocs[nvme_cmd_zone_mgmt_send] = cpu_to_le32(1 << 0);
+ log->iocs[nvme_cmd_zone_mgmt_recv] = cpu_to_le32(1 << 0);
+}
+
+static inline bool nvmet_bdev_validate_zns_zones(struct nvmet_ns *ns)
+{
+ if (ns->bdev->bd_disk->queue->conv_zones_bitmap) {
+ pr_err("block devices with conventional zones are not supported.");
+ return false;
+ }
+
+ return !(get_capacity(ns->bdev->bd_disk) &
+ (bdev_zone_sectors(ns->bdev) - 1));
+}
+
+static inline u8 nvmet_zasl(unsigned int zone_append_sects)
+{
+ /*
+ * Zone Append Size Limit is the value experessed in the units
+ * of minimum memory page size (i.e. 12) and is reported power of 2.
+ */
+ return ilog2((zone_append_sects << 9) >> NVMET_MPSMIN_SHIFT);
+}
+
+static inline void nvmet_zns_update_zasl(struct nvmet_ns *ns)
+{
+ u8 bio_max_zasl = nvmet_zasl((BIO_MAX_PAGES * PAGE_SIZE) >> 9);
+ struct request_queue *q = ns->bdev->bd_disk->queue;
+ struct nvmet_ns *ins;
+ unsigned long idx;
+ u8 min_zasl;
+
+ /*
+ * Calculate new ctrl->zasl value when enabling the new ns. This value
+ * has to be the minimum of the max_zone_append values from available
+ * namespaces.
+ */
+ min_zasl = ns->zasl = nvmet_zasl(queue_max_zone_append_sectors(q));
+
+ xa_for_each(&(ns->subsys->namespaces), idx, ins) {
+ struct request_queue *iq = ins->bdev->bd_disk->queue;
+ unsigned int imax_za_sects = queue_max_zone_append_sectors(iq);
+ u8 izasl = nvmet_zasl(imax_za_sects);
+
+ if (!bdev_is_zoned(ins->bdev))
+ continue;
+
+ min_zasl = min_zasl > izasl ? izasl : min_zasl;
+ }
+
+ ns->subsys->id_ctrl_zns.zasl = min_t(u8, min_zasl, bio_max_zasl);
+}
+
+bool nvmet_bdev_zns_enable(struct nvmet_ns *ns)
+{
+ if (!nvmet_bdev_validate_zns_zones(ns))
+ return false;
+
+ /*
+ * For ZBC and ZAC devices, writes into sequential zones must be aligned
+ * to the device physical block size. So use this value as the logical
+ * block size to avoid errors.
+ */
+ ns->blksize_shift = blksize_bits(bdev_physical_block_size(ns->bdev));
+
+ nvmet_zns_update_zasl(ns);
+
+ return true;
+}
+
+/*
+ * ZNS related Admin and I/O command handlers.
+ */
+void nvmet_execute_identify_cns_cs_ctrl(struct nvmet_req *req)
+{
+ u8 zasl = req->sq->ctrl->subsys->id_ctrl_zns.zasl;
+ struct nvmet_ctrl *ctrl = req->sq->ctrl;
+ struct nvme_id_ctrl_zns *id;
+ u16 status;
+
+ id = kzalloc(sizeof(*id), GFP_KERNEL);
+ if (!id) {
+ status = NVME_SC_INTERNAL;
+ goto out;
+ }
+
+ if (ctrl->ops->get_mdts)
+ id->zasl = min_t(u8, ctrl->ops->get_mdts(ctrl), zasl);
+ else
+ id->zasl = zasl;
+
+ status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
+
+ kfree(id);
+out:
+ nvmet_req_complete(req, status);
+}
+
+void nvmet_execute_identify_cns_cs_ns(struct nvmet_req *req)
+{
+ struct nvme_id_ns_zns *id_zns;
+ u16 status = 0;
+ u64 zsze;
+
+ if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
+ req->error_loc = offsetof(struct nvme_identify, nsid);
+ status = NVME_SC_INVALID_NS | NVME_SC_DNR;
+ goto out;
+ }
+
+ id_zns = kzalloc(sizeof(*id_zns), GFP_KERNEL);
+ if (!id_zns) {
+ status = NVME_SC_INTERNAL;
+ goto out;
+ }
+
+ req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
+ if (!req->ns) {
+ status = NVME_SC_INTERNAL;
+ goto done;
+ }
+
+ if (!bdev_is_zoned(nvmet_bdev(req))) {
+ req->error_loc = offsetof(struct nvme_identify, nsid);
+ status = NVME_SC_INVALID_NS | NVME_SC_DNR;
+ goto done;
+ }
+
+ nvmet_ns_revalidate(req->ns);
+ zsze = (bdev_zone_sectors(nvmet_bdev(req)) << 9) >>
+ req->ns->blksize_shift;
+ id_zns->lbafe[0].zsze = cpu_to_le64(zsze);
+ id_zns->mor = cpu_to_le32(bdev_max_open_zones(nvmet_bdev(req)));
+ id_zns->mar = cpu_to_le32(bdev_max_active_zones(nvmet_bdev(req)));
+
+done:
+ status = nvmet_copy_to_sgl(req, 0, id_zns, sizeof(*id_zns));
+ kfree(id_zns);
+out:
+ nvmet_req_complete(req, status);
+}
+
+struct nvmet_report_zone_data {
+ struct nvmet_ns *ns;
+ struct nvme_zone_report *rz;
+};
+
+static int nvmet_bdev_report_zone_cb(struct blk_zone *z, unsigned int idx,
+ void *data)
+{
+ struct nvmet_report_zone_data *report_zone_data = data;
+ struct nvme_zone_descriptor *entries = report_zone_data->rz->entries;
+ struct nvmet_ns *ns = report_zone_data->ns;
+
+ entries[idx].zcap = cpu_to_le64(nvmet_sect_to_lba(ns, z->capacity));
+ entries[idx].zslba = cpu_to_le64(nvmet_sect_to_lba(ns, z->start));
+ entries[idx].wp = cpu_to_le64(nvmet_sect_to_lba(ns, z->wp));
+ entries[idx].za = z->reset ? 1 << 2 : 0;
+ entries[idx].zt = z->type;
+ entries[idx].zs = z->cond << 4;
+
+ return 0;
+}
+
+void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req)
+{
+ u64 bufsize = (le32_to_cpu(req->cmd->zmr.numd) + 1) << 2;
+ struct nvmet_report_zone_data data = { .ns = req->ns };
+ struct nvme_zone_mgmt_recv_cmd *zmr = &req->cmd->zmr;
+ sector_t sect = nvmet_lba_to_sect(req->ns, le64_to_cpu(zmr->slba));
+ unsigned int nr_zones;
+ int reported_zones;
+ u16 status;
+
+ nr_zones = (bufsize - sizeof(struct nvme_zone_report)) /
+ sizeof(struct nvme_zone_descriptor);
+
+ status = nvmet_bdev_zns_checks(req);
+ if (status)
+ goto out;
+
+ data.rz = __vmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY);
+ if (!data.rz) {
+ status = NVME_SC_INTERNAL;
+ goto out;
+ }
+
+ reported_zones = blkdev_report_zones(nvmet_bdev(req), sect, nr_zones,
+ nvmet_bdev_report_zone_cb,
+ &data);
+ if (reported_zones < 0) {
+ status = NVME_SC_INTERNAL;
+ goto out_free_report_zones;
+ }
+
+ data.rz->nr_zones = cpu_to_le64(reported_zones);
+
+ status = nvmet_copy_to_sgl(req, 0, data.rz, bufsize);
+
+out_free_report_zones:
+ kvfree(data.rz);
+out:
+ nvmet_req_complete(req, status);
+}
+
+void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req)
+{
+ sector_t nr_sect = bdev_zone_sectors(nvmet_bdev(req));
+ struct nvme_zone_mgmt_send_cmd *c = &req->cmd->zms;
+ enum req_opf op = REQ_OP_LAST;
+ u16 status = NVME_SC_SUCCESS;
+ sector_t sect;
+ int ret;
+
+ sect = nvmet_lba_to_sect(req->ns, le64_to_cpu(req->cmd->zms.slba));
+
+ if (c->select_all)
+ nr_sect = get_capacity(nvmet_bdev(req)->bd_disk);
+
+ switch (c->zsa) {
+ case NVME_ZONE_OPEN:
+ op = REQ_OP_ZONE_OPEN;
+ break;
+ case NVME_ZONE_CLOSE:
+ op = REQ_OP_ZONE_CLOSE;
+ break;
+ case NVME_ZONE_FINISH:
+ op = REQ_OP_ZONE_FINISH;
+ break;
+ case NVME_ZONE_RESET:
+ op = REQ_OP_ZONE_RESET;
+ break;
+ default:
+ status = NVME_SC_INVALID_FIELD;
+ goto out;
+ }
+
+ ret = blkdev_zone_mgmt(nvmet_bdev(req), op, sect, nr_sect, GFP_KERNEL);
+ if (ret)
+ status = NVME_SC_INTERNAL;
+
+out:
+ nvmet_req_complete(req, status);
+}
+
+void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
+{
+ unsigned long bv_cnt = req->sg_cnt;
+ u64 slba = le64_to_cpu(req->cmd->rw.slba);
+ sector_t sect = nvmet_lba_to_sect(req->ns, slba);
+ u16 status = NVME_SC_SUCCESS;
+ size_t mapped_data_len = 0;
+ int sg_cnt = req->sg_cnt;
+ struct scatterlist *sg;
+ struct iov_iter from;
+ struct bio_vec *bvec;
+ size_t mapped_cnt;
+ struct bio *bio;
+ int ret;
+
+ if (!nvmet_check_transfer_len(req, nvmet_rw_data_len(req)))
+ return;
+
+ /*
+ * When setting the ctrl->zasl we consider the BIO_MAX_PAGES so that we
+ * don't have to split the bio, i.e. we shouldn't get
+ * sg_cnt > BIO_MAX_PAGES since zasl on the host will limit the I/Os
+ * with the size that considers the BIO_MAX_PAGES.
+ */
+ if (!req->sg_cnt)
+ goto out;
+
+ if (WARN_ON(req->sg_cnt > BIO_MAX_PAGES)) {
+ status = NVME_SC_INTERNAL | NVME_SC_DNR;
+ goto out;
+ }
+
+ bvec = kmalloc_array(bv_cnt, sizeof(*bvec), GFP_KERNEL);
+ if (!bvec) {
+ status = NVME_SC_INTERNAL | NVME_SC_DNR;
+ goto out;
+ }
+
+ for_each_sg(req->sg, sg, req->sg_cnt, mapped_cnt) {
+ nvmet_file_init_bvec(bvec, sg);
+ mapped_data_len += bvec[mapped_cnt].bv_len;
+ sg_cnt--;
+ if (mapped_cnt == bv_cnt)
+ break;
+ }
+
+ if (WARN_ON(sg_cnt)) {
+ status = NVME_SC_INTERNAL | NVME_SC_DNR;
+ goto out;
+ }
+
+ iov_iter_bvec(&from, WRITE, bvec, mapped_cnt, mapped_data_len);
+
+ bio = bio_alloc(GFP_KERNEL, bv_cnt);
+ bio_set_dev(bio, nvmet_bdev(req));
+ bio->bi_iter.bi_sector = sect;
+ bio->bi_opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
+
+ ret = __bio_iov_append_get_pages(bio, &from);
+ if (unlikely(ret)) {
+ status = NVME_SC_INTERNAL | NVME_SC_DNR;
+ bio_io_error(bio);
+ goto bvec_free;
+ }
+
+ ret = submit_bio_wait(bio);
+ status = ret < 0 ? NVME_SC_INTERNAL : status;
+ bio_put(bio);
+
+ sect += (mapped_data_len >> 9);
+ req->cqe->result.u64 = le64_to_cpu(nvmet_sect_to_lba(req->ns, sect));
+
+bvec_free:
+ kfree(bvec);
+
+out:
+ nvmet_req_complete(req, status);
+}
+
+#else /* CONFIG_BLK_DEV_ZONED */
+void nvmet_execute_identify_cns_cs_ctrl(struct nvmet_req *req)
+{
+}
+void nvmet_execute_identify_cns_cs_ns(struct nvmet_req *req)
+{
+}
+u16 nvmet_process_zns_cis(struct nvmet_req *req, off_t *off)
+{
+ return 0;
+}
+bool nvmet_bdev_zns_config(struct nvmet_ns *ns)
+{
+ return false;
+}
+void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req)
+{
+}
+void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req)
+{
+}
+void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
+{
+}
+void nvmet_zns_add_cmd_effects(struct nvme_effects_log *log)
+{
+}
+#endif /* CONFIG_BLK_DEV_ZONED */
--
2.22.1
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