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
@@ -44,6 +44,8 @@
 #define	NVME_IO_TEST			_IOWR('n', 100, struct nvme_io_test)
 #define	NVME_BIO_TEST			_IOWR('n', 101, struct nvme_io_test)
 
+/* NB: Fabrics-specific ioctls defined in nvmf.h start at 200. */
+
 /*
  * Macros to deal with NVME revisions, as defined VS register
  */
diff --git a/sys/dev/nvmf/nvmf.h b/sys/dev/nvmf/nvmf.h
new file mode 100644
--- /dev/null
+++ b/sys/dev/nvmf/nvmf.h
@@ -0,0 +1,79 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022-2024 Chelsio Communications, Inc.
+ * Written by: John Baldwin <jhb@FreeBSD.org>
+ */
+
+#ifndef __NVMF_H__
+#define	__NVMF_H__
+
+#include <sys/ioccom.h>
+#ifndef _KERNEL
+#include <stdbool.h>
+#endif
+
+/*
+ * Default settings in Fabrics controllers.  These match values used by the
+ * Linux target.
+ */
+#define	NVMF_MAX_IO_ENTRIES	(1024)
+#define	NVMF_CC_EN_TIMEOUT	(15)	/* In 500ms units */
+
+/* Allows for a 16k data buffer + SQE */
+#define	NVMF_IOCCSZ		(sizeof(struct nvme_command) + 16 * 1024)
+#define	NVMF_IORCSZ		(sizeof(struct nvme_completion))
+
+#define	NVMF_NN			(1024)
+
+struct nvmf_handoff_qpair_params {
+	bool	admin;
+	bool	sq_flow_control;
+	u_int	qsize;
+	uint16_t sqhd;
+	uint16_t sqtail;	/* host only */
+	union {
+		struct {
+			int	fd;
+			uint8_t	rxpda;
+			uint8_t txpda;
+			bool	header_digests;
+			bool	data_digests;
+			uint32_t maxr2t;
+			uint32_t maxh2cdata;
+			uint32_t max_icd;
+		} tcp;
+	};
+};
+
+struct nvmf_handoff_host {
+	u_int	trtype;
+	u_int	num_io_queues;
+	u_int	kato;
+	struct nvmf_handoff_qpair_params admin;
+	struct nvmf_handoff_qpair_params *io;
+	const struct nvme_controller_data *cdata;
+};
+
+struct nvmf_reconnect_params {
+	uint16_t cntlid;
+	char	subnqn[256];
+};
+
+struct nvmf_handoff_controller_qpair {
+	u_int	trtype;
+	struct nvmf_handoff_qpair_params params;
+	const struct nvmf_fabric_connect_cmd *cmd;
+	const struct nvmf_fabric_connect_data *data;
+};
+
+/* Operations on /dev/nvmf */
+#define	NVMF_HANDOFF_HOST	_IOW('n', 200, struct nvmf_handoff_host)
+#define	NVMF_DISCONNECT_HOST	_IOW('n', 201, const char *)
+#define	NVMF_DISCONNECT_ALL	_IO('n', 202)
+
+/* Operations on /dev/nvmeX */
+#define	NVMF_RECONNECT_PARAMS	_IOR('n', 203, struct nvmf_reconnect_params)
+#define	NVMF_RECONNECT_HOST	_IOW('n', 204, struct nvmf_handoff_host)
+
+#endif /* !__NVMF_H__ */