include/net/caif/caif_dev.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) ST-Ericsson AB 2010
   4  * Author:      Sjur Brendeland
   5  */
   6
   7 #ifndef CAIF_DEV_H_
   8 #define CAIF_DEV_H_
   9
  10 #include <net/caif/caif_layer.h>
  11 #include <net/caif/cfcnfg.h>
  12 #include <net/caif/caif_device.h>
  13 #include <linux/caif/caif_socket.h>
  14 #include <linux/if.h>
  15 #include <linux/net.h>
  16
  17 /**
  18  * struct caif_param - CAIF parameters.
  19  * @size:       Length of data
  20  * @data:       Binary Data Blob
  21  */
  22 struct caif_param {
  23         u16  size;
  24         u8   data[256];
  25 };
  26
  27 /**
  28  * struct caif_connect_request - Request data for CAIF channel setup.
  29  * @protocol:           Type of CAIF protocol to use (at, datagram etc)
  30  * @sockaddr:           Socket address to connect.
  31  * @priority:           Priority of the connection.
  32  * @link_selector:      Link selector (high bandwidth or low latency)
  33  * @ifindex:            kernel index of the interface.
  34  * @param:              Connect Request parameters (CAIF_SO_REQ_PARAM).
  35  *
  36  * This struct is used when connecting a CAIF channel.
  37  * It contains all CAIF channel configuration options.
  38  */
  39 struct caif_connect_request {
  40         enum caif_protocol_type protocol;
  41         struct sockaddr_caif sockaddr;
  42         enum caif_channel_priority priority;
  43         enum caif_link_selector link_selector;
  44         int ifindex;
  45         struct caif_param param;
  46 };
  47
  48 /**
  49  * caif_connect_client - Connect a client to CAIF Core Stack.
  50  * @config:             Channel setup parameters, specifying what address
  51  *                      to connect on the Modem.
  52  * @client_layer:       User implementation of client layer. This layer
  53  *                      MUST have receive and control callback functions
  54  *                      implemented.
  55  * @ifindex:            Link layer interface index used for this connection.
  56  * @headroom:           Head room needed by CAIF protocol.
  57  * @tailroom:           Tail room needed by CAIF protocol.
  58  *
  59  * This function connects a CAIF channel. The Client must implement
  60  * the struct cflayer. This layer represents the Client layer and holds
  61  * receive functions and control callback functions. Control callback
  62  * function will receive information about connect/disconnect responses,
  63  * flow control etc (see enum caif_control).
  64  * E.g. CAIF Socket will call this function for each socket it connects
  65  * and have one client_layer instance for each socket.
  66  */
  67 int caif_connect_client(struct net *net,
  68                         struct caif_connect_request *conn_req,
  69                         struct cflayer *client_layer, int *ifindex,
  70                         int *headroom, int *tailroom);
  71
  72 /**
  73  * caif_disconnect_client - Disconnects a client from the CAIF stack.
  74  *
  75  * @client_layer: Client layer to be disconnected.
  76  */
  77 int caif_disconnect_client(struct net *net, struct cflayer *client_layer);
  78
  79
  80 /**
  81  * caif_client_register_refcnt - register ref-count functions provided by client.
  82  *
  83  * @adapt_layer: Client layer using CAIF Stack.
  84  * @hold:       Function provided by client layer increasing ref-count
  85  * @put:        Function provided by client layer decreasing ref-count
  86  *
  87  * Client of the CAIF Stack must register functions for reference counting.
  88  * These functions are called by the CAIF Stack for every upstream packet,
  89  * and must therefore be implemented efficiently.
  90  *
  91  * Client should call caif_free_client when reference count degrease to zero.
  92  */
  93
  94 void caif_client_register_refcnt(struct cflayer *adapt_layer,
  95                                         void (*hold)(struct cflayer *lyr),
  96                                         void (*put)(struct cflayer *lyr));
  97 /**
  98  * caif_free_client - Free memory used to manage the client in the CAIF Stack.
  99  *
 100  * @client_layer: Client layer to be removed.
 101  *
 102  * This function must be called from client layer in order to free memory.
 103  * Caller must guarantee that no packets are in flight upstream when calling
 104  * this function.
 105  */
 106 void caif_free_client(struct cflayer *adap_layer);
 107
 108 /**
 109  * struct caif_enroll_dev - Enroll a net-device as a CAIF Link layer
 110  * @dev:                Network device to enroll.
 111  * @caifdev:            Configuration information from CAIF Link Layer
 112  * @link_support:       Link layer support layer
 113  * @head_room:          Head room needed by link support layer
 114  * @layer:              Lowest layer in CAIF stack
 115  * @rcv_fun:            Receive function for CAIF stack.
 116  *
 117  * This function enroll a CAIF link layer into CAIF Stack and
 118  * expects the interface to be able to handle CAIF payload.
 119  * The link_support layer is used to add any Link Layer specific
 120  * framing.
 121  */
 122 void caif_enroll_dev(struct net_device *dev, struct caif_dev_common *caifdev,
 123                         struct cflayer *link_support, int head_room,
 124                         struct cflayer **layer, int (**rcv_func)(
 125                                 struct sk_buff *, struct net_device *,
 126                                 struct packet_type *, struct net_device *));
 127
 128 #endif /* CAIF_DEV_H_ */