NVMe: Update SCSI Inquiry VPD 83h translation

The original translation created collisions on Inquiry VPD 83 for many
existing devices. Newer specifications provide other ways to translate
based on the device's version can be used to create unique identifiers.

Version 1.1 provides an EUI64 field that uniquely identifies each
namespace, and 1.2 added the longer NGUID field for the same reason.
Both follow the IEEE EUI format and readily translate to the SCSI device
identification EUI designator type 2h. For devices implementing either,
the translation will use this type, defaulting to the EUI64 8-byte type if
implemented then NGUID's 16 byte version if not. If neither are provided,
the 1.0 translation is used, and is updated to use the SCSI String format
to guarantee a unique identifier.

Knowing when to use the new fields depends on the nvme controller's
revision. The NVME_VS macro was not decoding this correctly, so that is
fixed in this patch and moved to a more appropriate place.

Since the Identify Namespace structure required an update for the NGUID
field, this patch adds the remaining new 1.2 fields to the structure.
Signed-off-by: NKeith Busch <keith.busch@intel.com>

drivers/block/nvme-scsi.c

@@ -779,10 +779,8 @@ static int nvme_trans_device_id_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	struct nvme_dev *dev = ns->dev;
 	dma_addr_t dma_addr;
 	void *mem;
-	struct nvme_id_ctrl *id_ctrl;
 	int res = SNTI_TRANSLATION_SUCCESS;
 	int nvme_sc;
-	u8 ieee[4];
 	int xfer_len;
 	__be32 tmp_id = cpu_to_be32(ns->ns_id);
 
@@ -793,8 +791,14 @@ static int nvme_trans_device_id_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 		goto out_dma;
 	}
 
-	/* nvme controller identify */
-	nvme_sc = nvme_identify(dev, 0, 1, dma_addr);
+	memset(inq_response, 0, alloc_len);
+	inq_response[1] = INQ_DEVICE_IDENTIFICATION_PAGE;    /* Page Code */
+	if (readl(&dev->bar->vs) >= NVME_VS(1, 1)) {
+		struct nvme_id_ns *id_ns = mem;
+		void *eui = id_ns->eui64;
+		int len = sizeof(id_ns->eui64);
+
+		nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
 		res = nvme_trans_status_code(hdr, nvme_sc);
 		if (res)
 			goto out_free;
@@ -802,37 +806,45 @@ static int nvme_trans_device_id_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 			res = nvme_sc;
 			goto out_free;
 		}
-	id_ctrl = mem;
 
-	/* Since SCSI tried to save 4 bits... [SPC-4(r34) Table 591] */
-	ieee[0] = id_ctrl->ieee[0] << 4;
-	ieee[1] = id_ctrl->ieee[0] >> 4 | id_ctrl->ieee[1] << 4;
-	ieee[2] = id_ctrl->ieee[1] >> 4 | id_ctrl->ieee[2] << 4;
-	ieee[3] = id_ctrl->ieee[2] >> 4;
+		if (readl(&dev->bar->vs) >= NVME_VS(1, 2)) {
+			if (bitmap_empty(eui, len * 8)) {
+				eui = id_ns->nguid;
+				len = sizeof(id_ns->nguid);
+			}
+		}
+		if (bitmap_empty(eui, len * 8))
+			goto scsi_string;
 
-	memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
-	inq_response[1] = INQ_DEVICE_IDENTIFICATION_PAGE;    /* Page Code */
-	inq_response[3] = 20;      /* Page Length */
+		inq_response[3] = 4 + len; /* Page Length */
 		/* Designation Descriptor start */
 		inq_response[4] = 0x01;    /* Proto ID=0h | Code set=1h */
-	inq_response[5] = 0x03;    /* PIV=0b | Asso=00b | Designator Type=3h */
+		inq_response[5] = 0x02;    /* PIV=0b | Asso=00b | Designator Type=2h */
 		inq_response[6] = 0x00;    /* Rsvd */
-	inq_response[7] = 16;      /* Designator Length */
-	/* Designator start */
-	inq_response[8] = 0x60 | ieee[3]; /* NAA=6h | IEEE ID MSB, High nibble*/
-	inq_response[9] = ieee[2];        /* IEEE ID */
-	inq_response[10] = ieee[1];       /* IEEE ID */
-	inq_response[11] = ieee[0];       /* IEEE ID| Vendor Specific ID... */
-	inq_response[12] = (dev->pci_dev->vendor & 0xFF00) >> 8;
-	inq_response[13] = (dev->pci_dev->vendor & 0x00FF);
-	inq_response[14] = dev->serial[0];
-	inq_response[15] = dev->serial[1];
-	inq_response[16] = dev->model[0];
-	inq_response[17] = dev->model[1];
-	memcpy(&inq_response[18], &tmp_id, sizeof(u32));
-	/* Last 2 bytes are zero */
+		inq_response[7] = len;     /* Designator Length */
+		memcpy(&inq_response[8], eui, len);
+	} else {
+ scsi_string:
+		if (alloc_len < 72) {
+			res = nvme_trans_completion(hdr,
+					SAM_STAT_CHECK_CONDITION,
+					ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
+					SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
+			goto out_free;
+		}
+		inq_response[3] = 0x48;    /* Page Length */
+		/* Designation Descriptor start */
+		inq_response[4] = 0x03;    /* Proto ID=0h | Code set=3h */
+		inq_response[5] = 0x08;    /* PIV=0b | Asso=00b | Designator Type=8h */
+		inq_response[6] = 0x00;    /* Rsvd */
+		inq_response[7] = 0x44;    /* Designator Length */
 
-	xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
+		sprintf(&inq_response[8], "%04x", dev->pci_dev->vendor);
+		memcpy(&inq_response[12], dev->model, sizeof(dev->model));
+		sprintf(&inq_response[52], "%04x", tmp_id);
+		memcpy(&inq_response[56], dev->serial, sizeof(dev->serial));
+	}
+	xfer_len = alloc_len;
 	res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
 
  out_free:
@@ -2222,7 +2234,7 @@ static int nvme_trans_inquiry(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	page_code = GET_INQ_PAGE_CODE(cmd);
 	alloc_len = GET_INQ_ALLOC_LENGTH(cmd);
 
-	inq_response = kmalloc(STANDARD_INQUIRY_LENGTH, GFP_KERNEL);
+	inq_response = kmalloc(alloc_len, GFP_KERNEL);
 	if (inq_response == NULL) {
 		res = -ENOMEM;
 		goto out_mem;

include/linux/nvme.h

@@ -62,8 +62,6 @@ enum {
 	NVME_CSTS_SHST_MASK	= 3 << 2,
 };
 
-#define NVME_VS(major, minor)	(major << 16 | minor)
-
 extern unsigned char nvme_io_timeout;
 #define NVME_IO_TIMEOUT	(nvme_io_timeout * HZ)
 

include/uapi/linux/nvme.h

@@ -115,7 +115,13 @@ struct nvme_id_ns {
 	__le16			nawun;
 	__le16			nawupf;
 	__le16			nacwu;
-	__u8			rsvd40[80];
+	__le16			nabsn;
+	__le16			nabo;
+	__le16			nabspf;
+	__u16			rsvd46;
+	__le64			nvmcap[2];
+	__u8			rsvd64[40];
+	__u8			nguid[16];
 	__u8			eui64[8];
 	struct nvme_lbaf	lbaf[16];
 	__u8			rsvd192[192];
@@ -565,6 +571,8 @@ struct nvme_passthru_cmd {
 	__u32	result;
 };
 
+#define NVME_VS(major, minor) (((major) << 16) | ((minor) << 8))
+
 #define nvme_admin_cmd nvme_passthru_cmd
 
 #define NVME_IOCTL_ID		_IO('N', 0x40)