/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) ST-Ericsson AB 2010
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* Author: Sjur Brendeland
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*/
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#ifndef CAIF_DEV_H_
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#define CAIF_DEV_H_
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#include <net/caif/caif_layer.h>
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#include <net/caif/cfcnfg.h>
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#include <net/caif/caif_device.h>
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#include <linux/caif/caif_socket.h>
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#include <linux/if.h>
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#include <linux/net.h>
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/**
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* struct caif_param - CAIF parameters.
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* @size: Length of data
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* @data: Binary Data Blob
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*/
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struct caif_param {
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u16 size;
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u8 data[256];
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};
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/**
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* struct caif_connect_request - Request data for CAIF channel setup.
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* @protocol: Type of CAIF protocol to use (at, datagram etc)
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* @sockaddr: Socket address to connect.
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* @priority: Priority of the connection.
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* @link_selector: Link selector (high bandwidth or low latency)
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* @ifindex: kernel index of the interface.
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* @param: Connect Request parameters (CAIF_SO_REQ_PARAM).
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*
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* This struct is used when connecting a CAIF channel.
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* It contains all CAIF channel configuration options.
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*/
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struct caif_connect_request {
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enum caif_protocol_type protocol;
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struct sockaddr_caif sockaddr;
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enum caif_channel_priority priority;
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enum caif_link_selector link_selector;
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int ifindex;
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struct caif_param param;
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};
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/**
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* caif_connect_client - Connect a client to CAIF Core Stack.
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* @config: Channel setup parameters, specifying what address
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* to connect on the Modem.
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* @client_layer: User implementation of client layer. This layer
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* MUST have receive and control callback functions
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* implemented.
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* @ifindex: Link layer interface index used for this connection.
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* @headroom: Head room needed by CAIF protocol.
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* @tailroom: Tail room needed by CAIF protocol.
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*
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* This function connects a CAIF channel. The Client must implement
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* the struct cflayer. This layer represents the Client layer and holds
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* receive functions and control callback functions. Control callback
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* function will receive information about connect/disconnect responses,
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* flow control etc (see enum caif_control).
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* E.g. CAIF Socket will call this function for each socket it connects
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* and have one client_layer instance for each socket.
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*/
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int caif_connect_client(struct net *net,
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struct caif_connect_request *conn_req,
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struct cflayer *client_layer, int *ifindex,
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int *headroom, int *tailroom);
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/**
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* caif_disconnect_client - Disconnects a client from the CAIF stack.
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*
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* @client_layer: Client layer to be disconnected.
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*/
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int caif_disconnect_client(struct net *net, struct cflayer *client_layer);
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/**
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* caif_client_register_refcnt - register ref-count functions provided by client.
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*
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* @adapt_layer: Client layer using CAIF Stack.
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* @hold: Function provided by client layer increasing ref-count
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* @put: Function provided by client layer decreasing ref-count
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*
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* Client of the CAIF Stack must register functions for reference counting.
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* These functions are called by the CAIF Stack for every upstream packet,
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* and must therefore be implemented efficiently.
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*
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* Client should call caif_free_client when reference count degrease to zero.
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*/
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void caif_client_register_refcnt(struct cflayer *adapt_layer,
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void (*hold)(struct cflayer *lyr),
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void (*put)(struct cflayer *lyr));
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/**
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* caif_free_client - Free memory used to manage the client in the CAIF Stack.
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*
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* @client_layer: Client layer to be removed.
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*
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* This function must be called from client layer in order to free memory.
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* Caller must guarantee that no packets are in flight upstream when calling
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* this function.
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*/
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void caif_free_client(struct cflayer *adap_layer);
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/**
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* struct caif_enroll_dev - Enroll a net-device as a CAIF Link layer
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* @dev: Network device to enroll.
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* @caifdev: Configuration information from CAIF Link Layer
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* @link_support: Link layer support layer
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* @head_room: Head room needed by link support layer
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* @layer: Lowest layer in CAIF stack
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* @rcv_fun: Receive function for CAIF stack.
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*
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* This function enroll a CAIF link layer into CAIF Stack and
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* expects the interface to be able to handle CAIF payload.
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* The link_support layer is used to add any Link Layer specific
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* framing.
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*/
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int caif_enroll_dev(struct net_device *dev, struct caif_dev_common *caifdev,
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struct cflayer *link_support, int head_room,
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struct cflayer **layer, int (**rcv_func)(
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struct sk_buff *, struct net_device *,
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struct packet_type *, struct net_device *));
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#endif /* CAIF_DEV_H_ */
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