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/* Copyright (c) 2011-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _IPC_ROUTER_XPRT_H
#define _IPC_ROUTER_XPRT_H
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/msm_ipc.h>
#include <linux/ipc_router.h>
#include <linux/kref.h>
#define IPC_ROUTER_XPRT_EVENT_DATA 1
#define IPC_ROUTER_XPRT_EVENT_OPEN 2
#define IPC_ROUTER_XPRT_EVENT_CLOSE 3
#define FRAG_PKT_WRITE_ENABLE 0x1
/**
* rr_header_v1 - IPC Router header version 1
* @version: Version information.
* @type: IPC Router Message Type.
* @src_node_id: Source Node ID of the message.
* @src_port_id: Source Port ID of the message.
* @control_flag: Flag to indicate flow control.
* @size: Size of the IPC Router payload.
* @dst_node_id: Destination Node ID of the message.
* @dst_port_id: Destination Port ID of the message.
*/
struct rr_header_v1 {
uint32_t version;
uint32_t type;
uint32_t src_node_id;
uint32_t src_port_id;
uint32_t control_flag;
uint32_t size;
uint32_t dst_node_id;
uint32_t dst_port_id;
};
/**
* rr_header_v2 - IPC Router header version 2
* @version: Version information.
* @type: IPC Router Message Type.
* @control_flag: Flags to indicate flow control, optional header etc.
* @opt_len: Combined size of the all optional headers in units of words.
* @size: Size of the IPC Router payload.
* @src_node_id: Source Node ID of the message.
* @src_port_id: Source Port ID of the message.
* @dst_node_id: Destination Node ID of the message.
* @dst_port_id: Destination Port ID of the message.
*/
struct rr_header_v2 {
uint8_t version;
uint8_t type;
uint8_t control_flag;
uint8_t opt_len;
uint32_t size;
uint16_t src_node_id;
uint16_t src_port_id;
uint16_t dst_node_id;
uint16_t dst_port_id;
} __attribute__((__packed__));
union rr_header {
struct rr_header_v1 hdr_v1;
struct rr_header_v2 hdr_v2;
};
/**
* rr_opt_hdr - Optional header for IPC Router header version 2
* @len: Total length of the optional header.
* @data: Pointer to the actual optional header.
*/
struct rr_opt_hdr {
size_t len;
unsigned char *data;
};
#define IPC_ROUTER_HDR_SIZE sizeof(union rr_header)
#define IPCR_WORD_SIZE 4
/**
* rr_packet - Router to Router packet structure
* @list: Pointer to prev & next packets in a port's rx list.
* @hdr: Header information extracted from or prepended to a packet.
* @opt_hdr: Optinal header information.
* @pkt_fragment_q: Queue of SKBs containing payload.
* @length: Length of data in the chain of SKBs
* @ref: Reference count for the packet.
*/
struct rr_packet {
struct list_head list;
struct rr_header_v1 hdr;
struct rr_opt_hdr opt_hdr;
struct sk_buff_head *pkt_fragment_q;
uint32_t length;
struct kref ref;
};
/**
* msm_ipc_router_xprt - Structure to hold XPRT specific information
* @name: Name of the XPRT.
* @link_id: Network cluster ID to which the XPRT belongs to.
* @priv: XPRT's private data.
* @get_version: Method to get header version supported by the XPRT.
* @set_version: Method to set header version in XPRT.
* @get_option: Method to get XPRT specific options.
* @read_avail: Method to get data size available to be read from the XPRT.
* @read: Method to read data from the XPRT.
* @write_avail: Method to get write space available in the XPRT.
* @write: Method to write data to the XPRT.
* @close: Method to close the XPRT.
* @sft_close_done: Method to indicate to the XPRT that handling of reset
* event is complete.
*/
struct msm_ipc_router_xprt {
char *name;
uint32_t link_id;
void *priv;
int (*get_version)(struct msm_ipc_router_xprt *xprt);
int (*get_option)(struct msm_ipc_router_xprt *xprt);
void (*set_version)(struct msm_ipc_router_xprt *xprt,
unsigned int version);
int (*read_avail)(struct msm_ipc_router_xprt *xprt);
int (*read)(void *data, uint32_t len,
struct msm_ipc_router_xprt *xprt);
int (*write_avail)(struct msm_ipc_router_xprt *xprt);
int (*write)(void *data, uint32_t len,
struct msm_ipc_router_xprt *xprt);
int (*close)(struct msm_ipc_router_xprt *xprt);
void (*sft_close_done)(struct msm_ipc_router_xprt *xprt);
};
void msm_ipc_router_xprt_notify(struct msm_ipc_router_xprt *xprt,
unsigned int event,
void *data);
/**
* create_pkt() - Create a Router packet
* @data: SKB queue to be contained inside the packet.
*
* @return: pointer to packet on success, NULL on failure.
*/
struct rr_packet *create_pkt(struct sk_buff_head *data);
struct rr_packet *clone_pkt(struct rr_packet *pkt);
void release_pkt(struct rr_packet *pkt);
/**
* ipc_router_peek_pkt_size() - Peek into the packet header to get potential
* packet size
* @data: Starting address of the packet which points to router header.
*
* @returns: potential packet size on success, < 0 on error.
*
* This function is used by the underlying transport abstraction layer to
* peek into the potential packet size of an incoming packet. This information
* is used to perform link layer fragmentation and re-assembly
*/
int ipc_router_peek_pkt_size(char *data);
#endif