linux-kernel - [PATCH 1/2] nvme: make independent ns identify default

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Message-ID: <20241008145503.987195-2-m@bjorling.me>
Date: Tue,  8 Oct 2024 16:55:02 +0200
From: Matias Bjørling <m@...rling.me>
To: kbusch@...nel.org,
	hch@....de,
	dlemoal@...nel.org,
	cassel@...nel.org,
	linux-nvme@...ts.infradead.org,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Matias Bjørling <matias.bjorling@....com>
Subject: [PATCH 1/2] nvme: make independent ns identify default

From: Matias Bjørling <matias.bjorling@....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@....com>
---
 drivers/nvme/host/core.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 0dc8bcc664f2..9cbef6342c39 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3999,7 +3999,7 @@ 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;
@@ -4015,10 +4015,9 @@ static void nvme_scan_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	 * data structure to find all the generic information that is needed to
 	 * 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))
+	if (!nvme_ctrl_limited_cns(ctrl))
 		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)
-- 
2.46.0