[PATCH 0/2] scsi: target: user configurable IEEE Company ID

[PATCH 0/2] scsi: target: user configurable IEEE Company ID

[Sergey Samoylenko]

The series allows to change IEEE Company ID component
of NAA LUN identifier returned on the SCSI INQUIRY VPD
page (aka WWID). Company ID can be changed via the
target/core/$backstore/$name/wwn/company_id ConfigFS path.

Sergey Samoylenko (2):
  scsi: target: core: Unify NAA identifer generation
  scsi: target: core: Add IEEE Company ID attribute

 drivers/target/target_core_configfs.c | 50 +++++++++++++++++++++++++++
 drivers/target/target_core_device.c   |  5 +++
 drivers/target/target_core_pr.h       |  2 +-
 drivers/target/target_core_spc.c      | 47 ++++++++++++-------------
 drivers/target/target_core_xcopy.c    | 17 ++-------
 include/target/target_core_base.h     |  1 +
 6 files changed, 82 insertions(+), 40 deletions(-)

-- 
2.27.0

[PATCH 1/2] scsi: target: core: Unify NAA identifer generation

[Sergey Samoylenko]

INQUIRY and XCOPY commands contain duplicate code paths with hardcoded
OpenFabrics Company ID for NAA designator.

Also, the two existing functions are somewhat poorly named:

 - spc_parse_naa_6h_vendor_specific()
 - target_xcopy_gen_naa_ieee()

The replacement function combines the names and hopefully better
reflects its meaning of *producing* NAA 6 designator:

 - spc_gen_naa_6h_vendor_specific()

Signed-off-by: Sergey Samoylenko <s.samoylenko@yadro.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
---
 drivers/target/target_core_pr.h    |  2 +-
 drivers/target/target_core_spc.c   | 47 +++++++++++++++---------------
 drivers/target/target_core_xcopy.c | 17 ++---------
 3 files changed, 26 insertions(+), 40 deletions(-)

diff --git a/drivers/target/target_core_pr.h b/drivers/target/target_core_pr.h
index a31c93e4e19c..b793c99637ab 100644
--- a/drivers/target/target_core_pr.h
+++ b/drivers/target/target_core_pr.h
@@ -52,7 +52,7 @@
 /*
  *  Function defined in target_core_spc.c
  */
-void spc_parse_naa_6h_vendor_specific(struct se_device *, unsigned char *);
+void spc_gen_naa_6h_vendor_specific(struct se_device *, unsigned char *);
 
 extern struct kmem_cache *t10_pr_reg_cache;
 
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 70a661801cb9..b2d19493a994 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -129,13 +129,28 @@ spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
 	return 0;
 }
 
-void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
-				      unsigned char *buf)
+/*
+ * Generate NAA IEEE Registered Extended designator
+ */
+void spc_gen_naa_6h_vendor_specific(struct se_device *dev,
+				    unsigned char *buf)
 {
 	unsigned char *p = &dev->t10_wwn.unit_serial[0];
-	int cnt;
+	int cnt, off = 0;
 	bool next = true;
 
+	/*
+	 * Start NAA IEEE Registered Extended Identifier/Designator
+	 */
+	buf[off++] = 0x6 << 4;
+
+	/*
+	 * Use OpenFabrics IEEE Company ID: 00 14 05
+	 */
+	buf[off++] = 0x01;
+	buf[off++] = 0x40;
+	buf[off] = (0x5 << 4);
+
 	/*
 	 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
 	 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
@@ -144,7 +159,7 @@ void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
 	 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
 	 * per device uniqeness.
 	 */
-	for (cnt = 0; *p && cnt < 13; p++) {
+	for (cnt = off + 13; *p && off < cnt; p++) {
 		int val = hex_to_bin(*p);
 
 		if (val < 0)
@@ -152,10 +167,10 @@ void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
 
 		if (next) {
 			next = false;
-			buf[cnt++] |= val;
+			buf[off++] |= val;
 		} else {
 			next = true;
-			buf[cnt] = val << 4;
+			buf[off] = val << 4;
 		}
 	}
 }
@@ -203,24 +218,8 @@ spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
 	/* Identifier/Designator length */
 	buf[off++] = 0x10;
 
-	/*
-	 * Start NAA IEEE Registered Extended Identifier/Designator
-	 */
-	buf[off++] = (0x6 << 4);
-
-	/*
-	 * Use OpenFabrics IEEE Company ID: 00 14 05
-	 */
-	buf[off++] = 0x01;
-	buf[off++] = 0x40;
-	buf[off] = (0x5 << 4);
-
-	/*
-	 * Return ConfigFS Unit Serial Number information for
-	 * VENDOR_SPECIFIC_IDENTIFIER and
-	 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
-	 */
-	spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
+	/* NAA IEEE Registered Extended designator */
+	spc_gen_naa_6h_vendor_specific(dev, &buf[off]);
 
 	len = 20;
 	off = (len + 4);
diff --git a/drivers/target/target_core_xcopy.c b/drivers/target/target_core_xcopy.c
index d31ed071cb08..2e7ce661ef32 100644
--- a/drivers/target/target_core_xcopy.c
+++ b/drivers/target/target_core_xcopy.c
@@ -33,19 +33,6 @@ static struct workqueue_struct *xcopy_wq = NULL;
 
 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop);
 
-static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
-{
-	int off = 0;
-
-	buf[off++] = (0x6 << 4);
-	buf[off++] = 0x01;
-	buf[off++] = 0x40;
-	buf[off] = (0x5 << 4);
-
-	spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
-	return 0;
-}
-
 /**
  * target_xcopy_locate_se_dev_e4_iter - compare XCOPY NAA device identifiers
  *
@@ -65,7 +52,7 @@ static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
 	}
 
 	memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
-	target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
+	spc_gen_naa_6h_vendor_specific(se_dev, &tmp_dev_wwn[0]);
 
 	rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
 	if (rc != 0) {
@@ -241,7 +228,7 @@ static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
 	 * se_device the XCOPY was received upon..
 	 */
 	memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
-	target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
+	spc_gen_naa_6h_vendor_specific(local_dev, &xop->local_dev_wwn[0]);
 
 	while (start < tdll) {
 		/*
-- 
2.27.0

[PATCH 2/2] scsi: target: core: Add IEEE Company ID attribute

[Sergey Samoylenko]

The attribute provides a way to set a company specific WWN
in configfs via:

  target/core/$backstore/$name/wwn/company_id

001405h remains default value for company id.

Signed-off-by: Sergey Samoylenko <s.samoylenko@yadro.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
---
 drivers/target/target_core_configfs.c | 50 +++++++++++++++++++++++++++
 drivers/target/target_core_device.c   |  5 +++
 drivers/target/target_core_spc.c      | 14 ++++----
 include/target/target_core_base.h     |  1 +
 4 files changed, 63 insertions(+), 7 deletions(-)

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 4b2e49341ad6..d6fd2779355a 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -1479,6 +1479,54 @@ static ssize_t target_wwn_revision_store(struct config_item *item,
 	return count;
 }
 
+static ssize_t
+target_wwn_company_id_show(struct config_item *item,
+				char *page)
+{
+	return snprintf(page, PAGE_SIZE, "%#08x\n",
+			to_t10_wwn(item)->company_id);
+}
+
+static ssize_t
+target_wwn_company_id_store(struct config_item *item,
+				 const char *page, size_t count)
+{
+	struct t10_wwn *t10_wwn = to_t10_wwn(item);
+	struct se_device *dev = t10_wwn->t10_dev;
+	u32 val;
+	int ret;
+
+	/*
+	 * The IEEE COMPANY_ID field should contain a 24-bit canonical
+	 * form OUI assigned by the IEEE.
+	 */
+	ret = kstrtou32(page, 0, &val);
+	if (ret < 0)
+		return ret;
+
+	if (val >= 0x1000000)
+		return -EOVERFLOW;
+
+	/*
+	 * Check to see if any active exports exist. If they do exist, fail
+	 * here as changing this information on the fly (underneath the
+	 * initiator side OS dependent multipath code) could cause negative
+	 * effects.
+	 */
+	if (dev->export_count) {
+		pr_err("Unable to set Company ID while %d exports exist\n",
+		       dev->export_count);
+		return -EINVAL;
+	}
+
+	t10_wwn->company_id = val;
+
+	pr_debug("Target_Core_ConfigFS: Set IEEE Company ID: %#08x\n",
+		 t10_wwn->company_id);
+
+	return count;
+}
+
 /*
  * VPD page 0x80 Unit serial
  */
@@ -1625,6 +1673,7 @@ DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
 CONFIGFS_ATTR(target_wwn_, vendor_id);
 CONFIGFS_ATTR(target_wwn_, product_id);
 CONFIGFS_ATTR(target_wwn_, revision);
+CONFIGFS_ATTR(target_wwn_, company_id);
 CONFIGFS_ATTR(target_wwn_, vpd_unit_serial);
 CONFIGFS_ATTR_RO(target_wwn_, vpd_protocol_identifier);
 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_logical_unit);
@@ -1635,6 +1684,7 @@ static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
 	&target_wwn_attr_vendor_id,
 	&target_wwn_attr_product_id,
 	&target_wwn_attr_revision,
+	&target_wwn_attr_company_id,
 	&target_wwn_attr_vpd_unit_serial,
 	&target_wwn_attr_vpd_protocol_identifier,
 	&target_wwn_attr_vpd_assoc_logical_unit,
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index a8df9f0a82fa..8cb1fa0c0585 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -773,6 +773,11 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 	spin_lock_init(&dev->t10_alua.lba_map_lock);
 
 	dev->t10_wwn.t10_dev = dev;
+	/*
+	 * Use OpenFabrics IEEE Company ID: 00 14 05
+	 */
+	dev->t10_wwn.company_id = 0x001405;
+
 	dev->t10_alua.t10_dev = dev;
 
 	dev->dev_attrib.da_dev = dev;
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index b2d19493a994..fe5d5ce4099c 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -136,20 +136,20 @@ void spc_gen_naa_6h_vendor_specific(struct se_device *dev,
 				    unsigned char *buf)
 {
 	unsigned char *p = &dev->t10_wwn.unit_serial[0];
+	u32 company_id = dev->t10_wwn.company_id;
 	int cnt, off = 0;
 	bool next = true;
 
 	/*
 	 * Start NAA IEEE Registered Extended Identifier/Designator
 	 */
-	buf[off++] = 0x6 << 4;
+	buf[off] = 0x6 << 4;
 
-	/*
-	 * Use OpenFabrics IEEE Company ID: 00 14 05
-	 */
-	buf[off++] = 0x01;
-	buf[off++] = 0x40;
-	buf[off] = (0x5 << 4);
+	/* IEEE COMPANY_ID */
+	buf[off++] |= (company_id >> 20) & 0xf;
+	buf[off++] = (company_id >> 12) & 0xff;
+	buf[off++] = (company_id >> 4) & 0xff;
+	buf[off] = (company_id & 0xf) << 4;
 
 	/*
 	 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index d1f7d2a45354..85c16c266eac 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -326,6 +326,7 @@ struct t10_wwn {
 	char model[INQUIRY_MODEL_LEN + 1];
 	char revision[INQUIRY_REVISION_LEN + 1];
 	char unit_serial[INQUIRY_VPD_SERIAL_LEN];
+	u32 company_id;
 	spinlock_t t10_vpd_lock;
 	struct se_device *t10_dev;
 	struct config_group t10_wwn_group;
-- 
2.27.0