idpf: implement core RDMA auxiliary dev create, init, and destroy

Add the initial idpf_idc.c file with the functions to kick off the IDC
initialization, create and initialize a core RDMA auxiliary device, and
destroy said device.

The RDMA core has a dependency on the vports being created by the
control plane before it can be initialized. Therefore, once all the
vports are up after a hard reset (either during driver load a function
level reset), the core RDMA device info will be created. It is populated
with the function type (as distinguished by the IDC initialization
function pointer), the core idc_ops function points (just stubs for
now), the reserved RDMA MSIX table, and various other info the core RDMA
auxiliary driver will need. It is then plugged on to the bus.

During a function level reset or driver unload, the device will be
unplugged from the bus and destroyed.

Reviewed-by: Madhu Chittim <madhu.chittim@intel.com>
Signed-off-by: Joshua Hay <joshua.a.hay@intel.com>
Signed-off-by: Tatyana Nikolova <tatyana.e.nikolova@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/include/linux/net/intel/iidc_rdma_idpf.h b/include/linux/net/intel/iidc_rdma_idpf.h
new file mode 100644
index 000000000000..f2fe1844f660
--- /dev/null
+++ b/include/linux/net/intel/iidc_rdma_idpf.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2025 Intel Corporation. */
+
+#ifndef _IIDC_RDMA_IDPF_H_
+#define _IIDC_RDMA_IDPF_H_
+
+#include <linux/auxiliary_bus.h>
+
+/* struct to be populated by core LAN PCI driver */
+enum iidc_function_type {
+	IIDC_FUNCTION_TYPE_PF,
+	IIDC_FUNCTION_TYPE_VF,
+};
+
+struct iidc_rdma_priv_dev_info {
+	struct msix_entry *msix_entries;
+	u16 msix_count; /* How many vectors are reserved for this device */
+	enum iidc_function_type ftype;
+};
+
+int idpf_idc_vport_dev_ctrl(struct iidc_rdma_core_dev_info *cdev_info, bool up);
+int idpf_idc_request_reset(struct iidc_rdma_core_dev_info *cdev_info,
+			   enum iidc_rdma_reset_type __always_unused reset_type);
+int idpf_idc_rdma_vc_send_sync(struct iidc_rdma_core_dev_info *cdev_info,
+			       u8 *send_msg, u16 msg_size,
+			       u8 *recv_msg, u16 *recv_len);
+
+#endif /* _IIDC_RDMA_IDPF_H_ */