nvmet: implement active command set ns list

This is required for nvme 2.1 for targets that support multiple command
sets. We support NVM and ZNS, so are required to support this
identification.

Reviewed-by: Chaitanya Kulkarni <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Matias Bjørling <[email protected]>
Signed-off-by: Keith Busch <[email protected]>

Author: keithbusch

drivers/nvme/target/admin-cmd.c

@@ -592,7 +592,7 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
 	nvmet_req_complete(req, status);
 }
 
-static void nvmet_execute_identify_nslist(struct nvmet_req *req)
+static void nvmet_execute_identify_nslist(struct nvmet_req *req, bool match_css)
 {
 	static const int buf_size = NVME_IDENTIFY_DATA_SIZE;
 	struct nvmet_ctrl *ctrl = req->sq->ctrl;
@@ -622,6 +622,8 @@ static void nvmet_execute_identify_nslist(struct nvmet_req *req)
 	xa_for_each(&ctrl->subsys->namespaces, idx, ns) {
 		if (ns->nsid <= min_nsid)
 			continue;
+		if (match_css && req->ns->csi != req->cmd->identify.csi)
+			continue;
 		list[i++] = cpu_to_le32(ns->nsid);
 		if (i == buf_size / sizeof(__le32))
 			break;
@@ -728,7 +730,7 @@ static void nvmet_execute_identify(struct nvmet_req *req)
 		nvmet_execute_identify_ctrl(req);
 		return;
 	case NVME_ID_CNS_NS_ACTIVE_LIST:
-		nvmet_execute_identify_nslist(req);
+		nvmet_execute_identify_nslist(req, false);
 		return;
 	case NVME_ID_CNS_NS_DESC_LIST:
 		nvmet_execute_identify_desclist(req);
@@ -759,6 +761,9 @@ static void nvmet_execute_identify(struct nvmet_req *req)
 			break;
 		}
 		break;
+	case NVME_ID_CNS_NS_ACTIVE_LIST_CS:
+		nvmet_execute_identify_nslist(req, true);
+		return;
 	}
 
 	pr_debug("unhandled identify cns %d on qid %d\n",

include/linux/nvme.h

@@ -522,6 +522,7 @@ enum {
 	NVME_ID_CNS_NS_DESC_LIST	= 0x03,
 	NVME_ID_CNS_CS_NS		= 0x05,
 	NVME_ID_CNS_CS_CTRL		= 0x06,
+	NVME_ID_CNS_NS_ACTIVE_LIST_CS	= 0x07,
 	NVME_ID_CNS_NS_CS_INDEP		= 0x08,
 	NVME_ID_CNS_NS_PRESENT_LIST	= 0x10,
 	NVME_ID_CNS_NS_PRESENT		= 0x11,