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