[PATCH v7 02/18] nvmet: Add vendor_id and subsys_vendor_id subsystem attributes

[Damien Le Moal <dlemoal@kernel.org>]

Define the new vendor_id and subsys_vendor_id configfs attribute for
target subsystems. These attributes are respectively reported as the
vid field and as the ssvid field of the identify controller data of
a target controllers using the subsystem for which these attributes
are set.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Rick Wertenbroek <rick.wertenbroek@gmail.com>
---
 drivers/nvme/target/admin-cmd.c |  5 ++--
 drivers/nvme/target/configfs.c  | 45 +++++++++++++++++++++++++++++++++
 drivers/nvme/target/nvmet.h     |  2 ++
 3 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 2962794ce881..b73f5fde4d9e 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -522,9 +522,8 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 		goto out;
 	}
 
-	/* XXX: figure out how to assign real vendors IDs. */
-	id->vid = 0;
-	id->ssvid = 0;
+	id->vid = cpu_to_le16(subsys->vendor_id);
+	id->ssvid = cpu_to_le16(subsys->subsys_vendor_id);
 
 	memcpy(id->sn, ctrl->subsys->serial, NVMET_SN_MAX_SIZE);
 	memcpy_and_pad(id->mn, sizeof(id->mn), subsys->model_number,
diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index eeee9e9b854c..4b2b8e7d96f5 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -1412,6 +1412,49 @@ static ssize_t nvmet_subsys_attr_cntlid_max_store(struct config_item *item,
 }
 CONFIGFS_ATTR(nvmet_subsys_, attr_cntlid_max);
 
+static ssize_t nvmet_subsys_attr_vendor_id_show(struct config_item *item,
+		char *page)
+{
+	return snprintf(page, PAGE_SIZE, "0x%x\n", to_subsys(item)->vendor_id);
+}
+
+static ssize_t nvmet_subsys_attr_vendor_id_store(struct config_item *item,
+		const char *page, size_t count)
+{
+	u16 vid;
+
+	if (kstrtou16(page, 0, &vid))
+		return -EINVAL;
+
+	down_write(&nvmet_config_sem);
+	to_subsys(item)->vendor_id = vid;
+	up_write(&nvmet_config_sem);
+	return count;
+}
+CONFIGFS_ATTR(nvmet_subsys_, attr_vendor_id);
+
+static ssize_t nvmet_subsys_attr_subsys_vendor_id_show(struct config_item *item,
+		char *page)
+{
+	return snprintf(page, PAGE_SIZE, "0x%x\n",
+			to_subsys(item)->subsys_vendor_id);
+}
+
+static ssize_t nvmet_subsys_attr_subsys_vendor_id_store(struct config_item *item,
+		const char *page, size_t count)
+{
+	u16 ssvid;
+
+	if (kstrtou16(page, 0, &ssvid))
+		return -EINVAL;
+
+	down_write(&nvmet_config_sem);
+	to_subsys(item)->subsys_vendor_id = ssvid;
+	up_write(&nvmet_config_sem);
+	return count;
+}
+CONFIGFS_ATTR(nvmet_subsys_, attr_subsys_vendor_id);
+
 static ssize_t nvmet_subsys_attr_model_show(struct config_item *item,
 					    char *page)
 {
@@ -1640,6 +1683,8 @@ static struct configfs_attribute *nvmet_subsys_attrs[] = {
 	&nvmet_subsys_attr_attr_serial,
 	&nvmet_subsys_attr_attr_cntlid_min,
 	&nvmet_subsys_attr_attr_cntlid_max,
+	&nvmet_subsys_attr_attr_vendor_id,
+	&nvmet_subsys_attr_attr_subsys_vendor_id,
 	&nvmet_subsys_attr_attr_model,
 	&nvmet_subsys_attr_attr_qid_max,
 	&nvmet_subsys_attr_attr_ieee_oui,
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 58328b35dc96..e4a31a37c14b 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -324,6 +324,8 @@ struct nvmet_subsys {
 	struct config_group	namespaces_group;
 	struct config_group	allowed_hosts_group;
 
+	u16			vendor_id;
+	u16			subsys_vendor_id;
 	char			*model_number;
 	u32			ieee_oui;
 	char			*firmware_rev;
-- 
2.47.1