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fwctl.h
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mlx5.h
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Editing: fwctl.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* Copyright (c) 2024-2025, NVIDIA CORPORATION & AFFILIATES. */ #ifndef _FWCTL_H #define _FWCTL_H #include <linux/types.h> #include <linux/ioctl.h> #define FWCTL_TYPE 0x9A /** * DOC: General ioctl format * * The ioctl interface follows a general format to allow for extensibility. Each * ioctl is passed a structure pointer as the argument providing the size of * the structure in the first u32. The kernel checks that any structure space * beyond what it understands is 0. This allows userspace to use the backward * compatible portion while consistently using the newer, larger, structures. * * ioctls use a standard meaning for common errnos: * * - ENOTTY: The IOCTL number itself is not supported at all * - E2BIG: The IOCTL number is supported, but the provided structure has * non-zero in a part the kernel does not understand. * - EOPNOTSUPP: The IOCTL number is supported, and the structure is * understood, however a known field has a value the kernel does not * understand or support. * - EINVAL: Everything about the IOCTL was understood, but a field is not * correct. * - ENOMEM: Out of memory. * - ENODEV: The underlying device has been hot-unplugged and the FD is * orphaned. * * As well as additional errnos, within specific ioctls. */ enum { FWCTL_CMD_BASE = 0, FWCTL_CMD_INFO = 0, FWCTL_CMD_RPC = 1, }; enum fwctl_device_type { FWCTL_DEVICE_TYPE_ERROR = 0, FWCTL_DEVICE_TYPE_MLX5 = 1, }; /** * struct fwctl_info - ioctl(FWCTL_INFO) * @size: sizeof(struct fwctl_info) * @flags: Must be 0 * @out_device_type: Returns the type of the device from enum fwctl_device_type * @device_data_len: On input the length of the out_device_data memory. On * output the size of the kernel's device_data which may be larger or * smaller than the input. Maybe 0 on input. * @out_device_data: Pointer to a memory of device_data_len bytes. Kernel will * fill the entire memory, zeroing as required. * * Returns basic information about this fwctl instance, particularly what driver * is being used to define the device_data format. */ struct fwctl_info { __u32 size; __u32 flags; __u32 out_device_type; __u32 device_data_len; __aligned_u64 out_device_data; }; #define FWCTL_INFO _IO(FWCTL_TYPE, FWCTL_CMD_INFO) /** * enum fwctl_rpc_scope - Scope of access for the RPC * * Refer to fwctl.rst for a more detailed discussion of these scopes. */ enum fwctl_rpc_scope { /** * @FWCTL_RPC_CONFIGURATION: Device configuration access scope * * Read/write access to device configuration. When configuration * is written to the device it remains in a fully supported state. */ FWCTL_RPC_CONFIGURATION = 0, /** * @FWCTL_RPC_DEBUG_READ_ONLY: Read only access to debug information * * Readable debug information. Debug information is compatible with * kernel lockdown, and does not disclose any sensitive information. For * instance exposing any encryption secrets from this information is * forbidden. */ FWCTL_RPC_DEBUG_READ_ONLY = 1, /** * @FWCTL_RPC_DEBUG_WRITE: Writable access to lockdown compatible debug information * * Allows write access to data in the device which may leave a fully * supported state. This is intended to permit intensive and possibly * invasive debugging. This scope will taint the kernel. */ FWCTL_RPC_DEBUG_WRITE = 2, /** * @FWCTL_RPC_DEBUG_WRITE_FULL: Write access to all debug information * * Allows read/write access to everything. Requires CAP_SYS_RAW_IO, so * it is not required to follow lockdown principals. If in doubt * debugging should be placed in this scope. This scope will taint the * kernel. */ FWCTL_RPC_DEBUG_WRITE_FULL = 3, }; /** * struct fwctl_rpc - ioctl(FWCTL_RPC) * @size: sizeof(struct fwctl_rpc) * @scope: One of enum fwctl_rpc_scope, required scope for the RPC * @in_len: Length of the in memory * @out_len: Length of the out memory * @in: Request message in device specific format * @out: Response message in device specific format * * Deliver a Remote Procedure Call to the device FW and return the response. The * call's parameters and return are marshaled into linear buffers of memory. Any * errno indicates that delivery of the RPC to the device failed. Return status * originating in the device during a successful delivery must be encoded into * out. * * The format of the buffers matches the out_device_type from FWCTL_INFO. */ struct fwctl_rpc { __u32 size; __u32 scope; __u32 in_len; __u32 out_len; __aligned_u64 in; __aligned_u64 out; }; #define FWCTL_RPC _IO(FWCTL_TYPE, FWCTL_CMD_RPC) #endif
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