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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__ */

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