linux-kernel - Re: [PATCH 0/2] nvme: add rotational support

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Message-ID: <ZwWsZvOrQGQ2UR2P@kbusch-mbp>
Date: Tue, 8 Oct 2024 16:04:22 -0600
From: Keith Busch <kbusch@...nel.org>
To: Matias Bjørling <m@...rling.me>
Cc: hch@....de, dlemoal@...nel.org, cassel@...nel.org,
	linux-nvme@...ts.infradead.org, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Matias Bjørling <matias.bjorling@....com>
Subject: Re: [PATCH 0/2] nvme: add rotational support

On Tue, Oct 08, 2024 at 09:13:48AM -0600, Keith Busch wrote:
> I still hope to see nvmet report this. It would be great to test this
> with HDD backed nvme-loop target.

I took the liberty to write one up. Looks like everything is reporting
as expected.

---
diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 954d4c0747704..e167c9a2ff995 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -685,6 +685,35 @@ static void nvmet_execute_identify_ctrl_nvm(struct nvmet_req *req)
 		   nvmet_zero_sgl(req, 0, sizeof(struct nvme_id_ctrl_nvm)));
 }
 
+static void nvmet_execute_id_cs_indep(struct nvmet_req *req)
+{
+	struct nvme_id_ns_cs_indep *id;
+	u16 status;
+
+	status = nvmet_req_find_ns(req);
+	if (status)
+		goto out;
+
+	id = kzalloc(sizeof(*id), GFP_KERNEL);
+	if (!id) {
+		status = NVME_SC_INTERNAL;
+		goto out;
+	}
+
+	id->nstat = NVME_NSTAT_NRDY;
+	id->anagrpid = req->ns->anagrpid;
+	id->nmic = NVME_NS_NMIC_SHARED;
+	if (req->ns->readonly)
+		id->nsattr |= NVME_NS_ATTR_RO;
+	if (req->ns->bdev && !bdev_nonrot(req->ns->bdev))
+		id->nsfeat |= NVME_NS_ROTATIONAL;
+
+	status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
+	kfree(id);
+out:
+	nvmet_req_complete(req, status);
+}
+
 static void nvmet_execute_identify(struct nvmet_req *req)
 {
 	if (!nvmet_check_transfer_len(req, NVME_IDENTIFY_DATA_SIZE))
@@ -729,6 +758,9 @@ static void nvmet_execute_identify(struct nvmet_req *req)
 			break;
 		}
 		break;
+	case NVME_ID_CNS_NS_CS_INDEP:
+		nvmet_execute_id_cs_indep(req);
+		return;
 	}
 
 	pr_debug("unhandled identify cns %d on qid %d\n",
--