diff --git a/sys/dev/nvme/nvme.h b/sys/dev/nvme/nvme.h
--- a/sys/dev/nvme/nvme.h
+++ b/sys/dev/nvme/nvme.h
@@ -40,6 +40,7 @@
 #define	NVME_RESET_CONTROLLER		_IO('n', 1)
 #define	NVME_GET_NSID			_IOR('n', 2, struct nvme_get_nsid)
 #define	NVME_GET_MAX_XFER_SIZE		_IOR('n', 3, uint64_t)
+#define	NVME_GET_CONTROLLER_DATA	_IOR('n', 4, struct nvme_controller_data)
 
 #define	NVME_IO_TEST			_IOWR('n', 100, struct nvme_io_test)
 #define	NVME_BIO_TEST			_IOWR('n', 101, struct nvme_io_test)
diff --git a/sys/dev/nvme/nvme_ctrlr.c b/sys/dev/nvme/nvme_ctrlr.c
--- a/sys/dev/nvme/nvme_ctrlr.c
+++ b/sys/dev/nvme/nvme_ctrlr.c
@@ -1443,6 +1443,9 @@
 	case NVME_GET_MAX_XFER_SIZE:
 		*(uint64_t *)arg = ctrlr->max_xfer_size;
 		break;
+	case NVME_GET_CONTROLLER_DATA:
+		memcpy(arg, &ctrlr->cdata, sizeof(ctrlr->cdata));
+		break;
 	/* Linux Compatible (see nvme_linux.h) */
 	case NVME_IOCTL_ID:
 		td->td_retval[0] = 0xfffffffful;
diff --git a/sys/dev/nvmf/host/nvmf.c b/sys/dev/nvmf/host/nvmf.c
--- a/sys/dev/nvmf/host/nvmf.c
+++ b/sys/dev/nvmf/host/nvmf.c
@@ -1095,6 +1095,9 @@
 	case NVME_GET_MAX_XFER_SIZE:
 		*(uint64_t *)arg = sc->max_xfer_size;
 		return (0);
+	case NVME_GET_CONTROLLER_DATA:
+		memcpy(arg, sc->cdata, sizeof(*sc->cdata));
+		return (0);
 	case NVMF_RECONNECT_PARAMS:
 		nv = (struct nvmf_ioc_nv *)arg;
 		return (nvmf_reconnect_params(sc, nv));