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NVMe: Update SCSI Inquiry VPD 83h translation

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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: Keith Busch <keith.busch@intel.com>
This commit is contained in:
Keith Busch
2015-02-19 13:42:14 -07:00
parent e1e5e5641e
commit 4f1982b4e2
3 changed files with 62 additions and 44 deletions
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10
include/uapi/linux/nvme.h
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@@ -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)