nvmet: add metadata/T10-PI support

Expose the namespace metadata format when PI is enabled. The user needs
to enable the capability per subsystem and per port. The other metadata
properties are taken from the namespace/bdev.

Usage example:
echo 1 > /config/nvmet/subsystems/${NAME}/attr_pi_enable
echo 1 > /config/nvmet/ports/${PORT_NUM}/param_pi_enable

Signed-off-by: Israel Rukshin <israelr@mellanox.com>
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 22 insertions, 4 deletions

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 7b6b0395eaca..1db8c0498668 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -341,6 +341,7 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 {
 	struct nvmet_ctrl *ctrl = req->sq->ctrl;
 	struct nvme_id_ctrl *id;
+	u32 cmd_capsule_size;
 	u16 status = 0;
 
 	id = kzalloc(sizeof(*id), GFP_KERNEL);
@@ -433,9 +434,15 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 
 	strlcpy(id->subnqn, ctrl->subsys->subsysnqn, sizeof(id->subnqn));
 
-	/* Max command capsule size is sqe + single page of in-capsule data */
-	id->ioccsz = cpu_to_le32((sizeof(struct nvme_command) +
-				  req->port->inline_data_size) / 16);
+	/*
+	 * Max command capsule size is sqe + in-capsule data size.
+	 * Disable in-capsule data for Metadata capable controllers.
+	 */
+	cmd_capsule_size = sizeof(struct nvme_command);
+	if (!ctrl->pi_support)
+		cmd_capsule_size += req->port->inline_data_size;
+	id->ioccsz = cpu_to_le32(cmd_capsule_size / 16);
+
 	/* Max response capsule size is cqe */
 	id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
 
@@ -465,6 +472,7 @@ out:
 
 static void nvmet_execute_identify_ns(struct nvmet_req *req)
 {
+	struct nvmet_ctrl *ctrl = req->sq->ctrl;
 	struct nvmet_ns *ns;
 	struct nvme_id_ns *id;
 	u16 status = 0;
@@ -482,7 +490,7 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
 	}
 
 	/* return an all zeroed buffer if we can't find an active namespace */
-	ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
+	ns = nvmet_find_namespace(ctrl, req->cmd->identify.nsid);
 	if (!ns)
 		goto done;
 
@@ -523,6 +531,16 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
 
 	id->lbaf[0].ds = ns->blksize_shift;
 
+	if (ctrl->pi_support && nvmet_ns_has_pi(ns)) {
+		id->dpc = NVME_NS_DPC_PI_FIRST | NVME_NS_DPC_PI_LAST |
+			  NVME_NS_DPC_PI_TYPE1 | NVME_NS_DPC_PI_TYPE2 |
+			  NVME_NS_DPC_PI_TYPE3;
+		id->mc = NVME_MC_EXTENDED_LBA;
+		id->dps = ns->pi_type;
+		id->flbas = NVME_NS_FLBAS_META_EXT;
+		id->lbaf[0].ms = cpu_to_le16(ns->metadata_size);
+	}
+
 	if (ns->readonly)
 		id->nsattr |= (1 << 0);
 	nvmet_put_namespace(ns);