[PATCHv4 10/13] nvme: use command set independent id ns if available

[Keith Busch]

From: Matias Bjørling <matias.bjorling at wdc.com>

The NVMe 2.0 specification adds an independent identify namespace
data structure that contains generic attributes that apply to all
namespace types. Some attributes carry over from the NVM command set
identify namespace data structure, and others are new.

Currently, the data structure only considered when CRIMS is enabled or
when the namespace type is key-value.

However, the independent namespace data structure is mandatory for
devices that implement features from the 2.0+ specification. Therefore,
we can check this data structure first. If unavailable, retrieve the
generic attributes from the NVM command set identify namespace data
structure.

Signed-off-by: Matias Bjørling <matias.bjorling at wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>
Signed-off-by: Keith Busch <kbusch at kernel.org>
---
 drivers/nvme/host/core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 279b0f445904d..162889b6382aa 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3988,7 +3988,7 @@ static void nvme_scan_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 {
 	struct nvme_ns_info info = { .nsid = nsid };
 	struct nvme_ns *ns;
-	int ret;
+	int ret = 1;
 
 	if (nvme_identify_ns_descs(ctrl, &info))
 		return;
@@ -4005,9 +4005,10 @@ static void nvme_scan_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	 * set up a namespace.  If not fall back to the legacy version.
 	 */
 	if ((ctrl->cap & NVME_CAP_CRMS_CRIMS) ||
-	    (info.ids.csi != NVME_CSI_NVM && info.ids.csi != NVME_CSI_ZNS))
+	    (info.ids.csi != NVME_CSI_NVM && info.ids.csi != NVME_CSI_ZNS) ||
+	    ctrl->vs >= NVME_VS(2, 0, 0))
 		ret = nvme_ns_info_from_id_cs_indep(ctrl, &info);
-	else
+	if (ret > 0)
 		ret = nvme_ns_info_from_identify(ctrl, &info);
 
 	if (info.is_removed)
-- 
2.43.5