drivers/infiniband/hw/nes/nes_cm.h - maze/linux - Git at Google

 /*
  * Copyright (c) 2006 - 2011 Intel Corporation.  All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * OpenIB.org BSD license below:
  *
  *     Redistribution and use in source and binary forms, with or
  *     without modification, are permitted provided that the following
  *     conditions are met:
  *
  *      - Redistributions of source code must retain the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer.
  *
  *      - Redistributions in binary form must reproduce the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer in the documentation and/or other materials
  *        provided with the distribution.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  *
  */

 #ifndef NES_CM_H
 #define NES_CM_H

 #define QUEUE_EVENTS

 #define NES_MANAGE_APBVT_DEL 0
 #define NES_MANAGE_APBVT_ADD 1

 #define NES_MPA_REQUEST_ACCEPT  1
 #define NES_MPA_REQUEST_REJECT  2

 /* IETF MPA -- defines, enums, structs */
 #define IEFT_MPA_KEY_REQ  "MPA ID Req Frame"
 #define IEFT_MPA_KEY_REP  "MPA ID Rep Frame"
 #define IETF_MPA_KEY_SIZE 16
 #define IETF_MPA_VERSION  1
 #define IETF_MAX_PRIV_DATA_LEN 512
 #define IETF_MPA_FRAME_SIZE    20
 #define IETF_RTR_MSG_SIZE      4
 #define IETF_MPA_V2_FLAG       0x10

 /* IETF RTR MSG Fields               */
 #define IETF_PEER_TO_PEER       0x8000
 #define IETF_FLPDU_ZERO_LEN     0x4000
 #define IETF_RDMA0_WRITE        0x8000
 #define IETF_RDMA0_READ         0x4000
 #define IETF_NO_IRD_ORD         0x3FFF
 #define NES_MAX_IRD		 0x40
 #define NES_MAX_ORD		 0x7F

 enum ietf_mpa_flags {
 	IETF_MPA_FLAGS_MARKERS = 0x80,	/* receive Markers */
 	IETF_MPA_FLAGS_CRC     = 0x40,	/* receive Markers */
 	IETF_MPA_FLAGS_REJECT  = 0x20,	/* Reject */
 };

 struct ietf_mpa_v1 {
 	u8 key[IETF_MPA_KEY_SIZE];
 	u8 flags;
 	u8 rev;
 	__be16 priv_data_len;
 	u8 priv_data[0];
 };

 #define ietf_mpa_req_resp_frame ietf_mpa_frame

 struct ietf_rtr_msg {
 	__be16 ctrl_ird;
 	__be16 ctrl_ord;
 };

 struct ietf_mpa_v2 {
 	u8 key[IETF_MPA_KEY_SIZE];
 	u8 flags;
 	u8 rev;
 	 __be16 priv_data_len;
 	struct ietf_rtr_msg rtr_msg;
 	u8 priv_data[0];
 };

 struct nes_v4_quad {
 	u32 rsvd0;
 	__le32 DstIpAdrIndex;	/* Only most significant 5 bits are valid */
 	__be32 SrcIpadr;
 	__be16 TcpPorts[2];		/* src is low, dest is high */
 };

 struct nes_cm_node;
 enum nes_timer_type {
 	NES_TIMER_TYPE_SEND,
 	NES_TIMER_TYPE_RECV,
 	NES_TIMER_NODE_CLEANUP,
 	NES_TIMER_TYPE_CLOSE,
 };

 #define NES_PASSIVE_STATE_INDICATED	0
 #define NES_DO_NOT_SEND_RESET_EVENT	1
 #define NES_SEND_RESET_EVENT		2

 #define MAX_NES_IFS 4

 #define SET_ACK 1
 #define SET_SYN 2
 #define SET_FIN 4
 #define SET_RST 8

 #define TCP_OPTIONS_PADDING	3

 struct option_base {
 	u8 optionnum;
 	u8 length;
 };

 enum option_numbers {
 	OPTION_NUMBER_END,
 	OPTION_NUMBER_NONE,
 	OPTION_NUMBER_MSS,
 	OPTION_NUMBER_WINDOW_SCALE,
 	OPTION_NUMBER_SACK_PERM,
 	OPTION_NUMBER_SACK,
 	OPTION_NUMBER_WRITE0 = 0xbc
 };

 struct option_mss {
 	u8 optionnum;
 	u8 length;
 	__be16 mss;
 };

 struct option_windowscale {
 	u8 optionnum;
 	u8 length;
 	u8 shiftcount;
 };

 union all_known_options {
 	char as_end;
 	struct option_base as_base;
 	struct option_mss as_mss;
 	struct option_windowscale as_windowscale;
 };

 struct nes_timer_entry {
 	struct list_head list;
 	unsigned long timetosend;	/* jiffies */
 	struct sk_buff *skb;
 	u32 type;
 	u32 retrycount;
 	u32 retranscount;
 	u32 context;
 	u32 seq_num;
 	u32 send_retrans;
 	int close_when_complete;
 	struct net_device *netdev;
 };

 #define NES_DEFAULT_RETRYS  64
 #define NES_DEFAULT_RETRANS 8
 #ifdef CONFIG_INFINIBAND_NES_DEBUG
 #define NES_RETRY_TIMEOUT   (1000*HZ/1000)
 #else
 #define NES_RETRY_TIMEOUT   (3000*HZ/1000)
 #endif
 #define NES_SHORT_TIME      (10)
 #define NES_LONG_TIME       (2000*HZ/1000)
 #define NES_MAX_TIMEOUT     ((unsigned long) (12*HZ))

 #define NES_CM_HASHTABLE_SIZE         1024
 #define NES_CM_TCP_TIMER_INTERVAL     3000
 #define NES_CM_DEFAULT_MTU            1540
 #define NES_CM_DEFAULT_FRAME_CNT      10
 #define NES_CM_THREAD_STACK_SIZE      256
 #define NES_CM_DEFAULT_RCV_WND        64240	// before we know that window scaling is allowed
 #define NES_CM_DEFAULT_RCV_WND_SCALED 256960  // after we know that window scaling is allowed
 #define NES_CM_DEFAULT_RCV_WND_SCALE  2
 #define NES_CM_DEFAULT_FREE_PKTS      0x000A
 #define NES_CM_FREE_PKT_LO_WATERMARK  2

 #define NES_CM_DEFAULT_MSS   536

 #define NES_CM_DEF_SEQ       0x159bf75f
 #define NES_CM_DEF_LOCAL_ID  0x3b47

 #define NES_CM_DEF_SEQ2      0x18ed5740
 #define NES_CM_DEF_LOCAL_ID2 0xb807
 #define	MAX_CM_BUFFER	(IETF_MPA_FRAME_SIZE + IETF_RTR_MSG_SIZE + IETF_MAX_PRIV_DATA_LEN)

 typedef u32 nes_addr_t;

 #define nes_cm_tsa_context nes_qp_context

 struct nes_qp;

 /* cm node transition states */
 enum nes_cm_node_state {
 	NES_CM_STATE_UNKNOWN,
 	NES_CM_STATE_INITED,
 	NES_CM_STATE_LISTENING,
 	NES_CM_STATE_SYN_RCVD,
 	NES_CM_STATE_SYN_SENT,
 	NES_CM_STATE_ONE_SIDE_ESTABLISHED,
 	NES_CM_STATE_ESTABLISHED,
 	NES_CM_STATE_ACCEPTING,
 	NES_CM_STATE_MPAREQ_SENT,
 	NES_CM_STATE_MPAREQ_RCVD,
 	NES_CM_STATE_MPAREJ_RCVD,
 	NES_CM_STATE_TSA,
 	NES_CM_STATE_FIN_WAIT1,
 	NES_CM_STATE_FIN_WAIT2,
 	NES_CM_STATE_CLOSE_WAIT,
 	NES_CM_STATE_TIME_WAIT,
 	NES_CM_STATE_LAST_ACK,
 	NES_CM_STATE_CLOSING,
 	NES_CM_STATE_LISTENER_DESTROYED,
 	NES_CM_STATE_CLOSED
 };

 enum mpa_frame_version {
 	IETF_MPA_V1 = 1,
 	IETF_MPA_V2 = 2
 };

 enum mpa_frame_key {
 	MPA_KEY_REQUEST,
 	MPA_KEY_REPLY
 };

 enum send_rdma0 {
 	SEND_RDMA_READ_ZERO = 1,
 	SEND_RDMA_WRITE_ZERO = 2
 };

 enum nes_tcpip_pkt_type {
 	NES_PKT_TYPE_UNKNOWN,
 	NES_PKT_TYPE_SYN,
 	NES_PKT_TYPE_SYNACK,
 	NES_PKT_TYPE_ACK,
 	NES_PKT_TYPE_FIN,
 	NES_PKT_TYPE_RST
 };


 /* type of nes connection */
 enum nes_cm_conn_type {
 	NES_CM_IWARP_CONN_TYPE,
 };

 /* CM context params */
 struct nes_cm_tcp_context {
 	u8  client;

 	u32 loc_seq_num;
 	u32 loc_ack_num;
 	u32 rem_ack_num;
 	u32 rcv_nxt;

 	u32 loc_id;
 	u32 rem_id;

 	u32 snd_wnd;
 	u32 max_snd_wnd;

 	u32 rcv_wnd;
 	u32 mss;
 	u8  snd_wscale;
 	u8  rcv_wscale;

 	struct nes_cm_tsa_context tsa_cntxt;
 	struct timeval            sent_ts;
 };


 enum nes_cm_listener_state {
 	NES_CM_LISTENER_PASSIVE_STATE = 1,
 	NES_CM_LISTENER_ACTIVE_STATE = 2,
 	NES_CM_LISTENER_EITHER_STATE = 3
 };

 struct nes_cm_listener {
 	struct list_head           list;
 	struct nes_cm_core         *cm_core;
 	u8                         loc_mac[ETH_ALEN];
 	nes_addr_t                 loc_addr;
 	u16                        loc_port;
 	struct iw_cm_id            *cm_id;
 	enum nes_cm_conn_type      conn_type;
 	atomic_t                   ref_count;
 	struct nes_vnic            *nesvnic;
 	atomic_t                   pend_accepts_cnt;
 	int                        backlog;
 	enum nes_cm_listener_state listener_state;
 	u32                        reused_node;
 };

 /* per connection node and node state information */
 struct nes_cm_node {
 	nes_addr_t                loc_addr, rem_addr;
 	u16                       loc_port, rem_port;

 	u8                        loc_mac[ETH_ALEN];
 	u8                        rem_mac[ETH_ALEN];

 	enum nes_cm_node_state    state;
 	struct nes_cm_tcp_context tcp_cntxt;
 	struct nes_cm_core        *cm_core;
 	struct sk_buff_head       resend_list;
 	atomic_t                  ref_count;
 	struct net_device         *netdev;

 	struct nes_cm_node        *loopbackpartner;

 	struct nes_timer_entry	  *send_entry;
 	struct nes_timer_entry    *recv_entry;
 	spinlock_t                retrans_list_lock;
 	enum send_rdma0           send_rdma0_op;

 	union {
 		struct ietf_mpa_v1 mpa_frame;
 		struct ietf_mpa_v2 mpa_v2_frame;
 		u8                 mpa_frame_buf[MAX_CM_BUFFER];
 	};
 	enum mpa_frame_version    mpa_frame_rev;
 	u16			  ird_size;
 	u16                       ord_size;
 	u16			  mpav2_ird_ord;

 	u16                       mpa_frame_size;
 	struct iw_cm_id           *cm_id;
 	struct list_head          list;
 	int                       accelerated;
 	struct nes_cm_listener    *listener;
 	enum nes_cm_conn_type     conn_type;
 	struct nes_vnic           *nesvnic;
 	int                       apbvt_set;
 	int                       accept_pend;
 	struct list_head	timer_entry;
 	struct list_head	reset_entry;
 	struct nes_qp		*nesqp;
 	atomic_t 		passive_state;
 };

 /* structure for client or CM to fill when making CM api calls. */
 /*	- only need to set relevant data, based on op. */
 struct nes_cm_info {
 	union {
 		struct iw_cm_id   *cm_id;
 		struct net_device *netdev;
 	};

 	u16 loc_port;
 	u16 rem_port;
 	nes_addr_t loc_addr;
 	nes_addr_t rem_addr;

 	enum nes_cm_conn_type  conn_type;
 	int backlog;
 };

 /* CM event codes */
 enum  nes_cm_event_type {
 	NES_CM_EVENT_UNKNOWN,
 	NES_CM_EVENT_ESTABLISHED,
 	NES_CM_EVENT_MPA_REQ,
 	NES_CM_EVENT_MPA_CONNECT,
 	NES_CM_EVENT_MPA_ACCEPT,
 	NES_CM_EVENT_MPA_REJECT,
 	NES_CM_EVENT_MPA_ESTABLISHED,
 	NES_CM_EVENT_CONNECTED,
 	NES_CM_EVENT_CLOSED,
 	NES_CM_EVENT_RESET,
 	NES_CM_EVENT_DROPPED_PKT,
 	NES_CM_EVENT_CLOSE_IMMED,
 	NES_CM_EVENT_CLOSE_HARD,
 	NES_CM_EVENT_CLOSE_CLEAN,
 	NES_CM_EVENT_ABORTED,
 	NES_CM_EVENT_SEND_FIRST
 };

 /* event to post to CM event handler */
 struct nes_cm_event {
 	enum nes_cm_event_type type;

 	struct nes_cm_info cm_info;
 	struct work_struct event_work;
 	struct nes_cm_node *cm_node;
 };

 struct nes_cm_core {
 	enum nes_cm_node_state  state;

 	atomic_t                listen_node_cnt;
 	struct nes_cm_node      listen_list;
 	spinlock_t              listen_list_lock;

 	u32                     mtu;
 	u32                     free_tx_pkt_max;
 	u32                     rx_pkt_posted;
 	atomic_t                ht_node_cnt;
 	struct list_head        connected_nodes;
 	/* struct list_head hashtable[NES_CM_HASHTABLE_SIZE]; */
 	spinlock_t              ht_lock;

 	struct timer_list       tcp_timer;

 	struct nes_cm_ops       *api;

 	int (*post_event)(struct nes_cm_event *event);
 	atomic_t                events_posted;
 	struct workqueue_struct *event_wq;
 	struct workqueue_struct *disconn_wq;

 	atomic_t                node_cnt;
 	u64                     aborted_connects;
 	u32                     options;

 	struct nes_cm_node      *current_listen_node;
 };


 #define NES_CM_SET_PKT_SIZE        (1 << 1)
 #define NES_CM_SET_FREE_PKT_Q_SIZE (1 << 2)

 /* CM ops/API for client interface */
 struct nes_cm_ops {
 	int (*accelerated)(struct nes_cm_core *, struct nes_cm_node *);
 	struct nes_cm_listener * (*listen)(struct nes_cm_core *, struct nes_vnic *,
 			struct nes_cm_info *);
 	int (*stop_listener)(struct nes_cm_core *, struct nes_cm_listener *);
 	struct nes_cm_node * (*connect)(struct nes_cm_core *,
 			struct nes_vnic *, u16, void *,
 			struct nes_cm_info *);
 	int (*close)(struct nes_cm_core *, struct nes_cm_node *);
 	int (*accept)(struct nes_cm_core *, struct nes_cm_node *);
 	int (*reject)(struct nes_cm_core *, struct nes_cm_node *);
 	int (*recv_pkt)(struct nes_cm_core *, struct nes_vnic *,
 			struct sk_buff *);
 	int (*destroy_cm_core)(struct nes_cm_core *);
 	int (*get)(struct nes_cm_core *);
 	int (*set)(struct nes_cm_core *, u32, u32);
 };

 int schedule_nes_timer(struct nes_cm_node *, struct sk_buff *,
 		enum nes_timer_type, int, int);

 int nes_accept(struct iw_cm_id *, struct iw_cm_conn_param *);
 int nes_reject(struct iw_cm_id *, const void *, u8);
 int nes_connect(struct iw_cm_id *, struct iw_cm_conn_param *);
 int nes_create_listen(struct iw_cm_id *, int);
 int nes_destroy_listen(struct iw_cm_id *);

 int nes_cm_recv(struct sk_buff *, struct net_device *);
 int nes_cm_start(void);
 int nes_cm_stop(void);
 int nes_add_ref_cm_node(struct nes_cm_node *cm_node);
 int nes_rem_ref_cm_node(struct nes_cm_node *cm_node);

 #endif			/* NES_CM_H */
	/*
	* Copyright (c) 2006 - 2011 Intel Corporation. All rights reserved.
	*
	* This software is available to you under a choice of one of two
	* licenses. You may choose to be licensed under the terms of the GNU
	* General Public License (GPL) Version 2, available from the file
	* COPYING in the main directory of this source tree, or the
	* OpenIB.org BSD license below:
	*
	* Redistribution and use in source and binary forms, with or
	* without modification, are permitted provided that the following
	* conditions are met:
	*
	* - Redistributions of source code must retain the above
	* copyright notice, this list of conditions and the following
	* disclaimer.
	*
	* - Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following
	* disclaimer in the documentation and/or other materials
	* provided with the distribution.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*
	*/

	#ifndef NES_CM_H
	#define NES_CM_H

	#define QUEUE_EVENTS

	#define NES_MANAGE_APBVT_DEL 0
	#define NES_MANAGE_APBVT_ADD 1

	#define NES_MPA_REQUEST_ACCEPT 1
	#define NES_MPA_REQUEST_REJECT 2

	/* IETF MPA -- defines, enums, structs */
	#define IEFT_MPA_KEY_REQ "MPA ID Req Frame"
	#define IEFT_MPA_KEY_REP "MPA ID Rep Frame"
	#define IETF_MPA_KEY_SIZE 16
	#define IETF_MPA_VERSION 1
	#define IETF_MAX_PRIV_DATA_LEN 512
	#define IETF_MPA_FRAME_SIZE 20
	#define IETF_RTR_MSG_SIZE 4
	#define IETF_MPA_V2_FLAG 0x10

	/* IETF RTR MSG Fields */
	#define IETF_PEER_TO_PEER 0x8000
	#define IETF_FLPDU_ZERO_LEN 0x4000
	#define IETF_RDMA0_WRITE 0x8000
	#define IETF_RDMA0_READ 0x4000
	#define IETF_NO_IRD_ORD 0x3FFF
	#define NES_MAX_IRD 0x40
	#define NES_MAX_ORD 0x7F

	enum ietf_mpa_flags {
	IETF_MPA_FLAGS_MARKERS = 0x80, /* receive Markers */
	IETF_MPA_FLAGS_CRC = 0x40, /* receive Markers */
	IETF_MPA_FLAGS_REJECT = 0x20, /* Reject */
	};

	struct ietf_mpa_v1 {
	u8 key[IETF_MPA_KEY_SIZE];
	u8 flags;
	u8 rev;
	__be16 priv_data_len;
	u8 priv_data[0];
	};

	#define ietf_mpa_req_resp_frame ietf_mpa_frame

	struct ietf_rtr_msg {
	__be16 ctrl_ird;
	__be16 ctrl_ord;
	};

	struct ietf_mpa_v2 {
	u8 key[IETF_MPA_KEY_SIZE];
	u8 flags;
	u8 rev;
	__be16 priv_data_len;
	struct ietf_rtr_msg rtr_msg;
	u8 priv_data[0];
	};

	struct nes_v4_quad {
	u32 rsvd0;
	__le32 DstIpAdrIndex; /* Only most significant 5 bits are valid */
	__be32 SrcIpadr;
	__be16 TcpPorts[2]; /* src is low, dest is high */
	};

	struct nes_cm_node;
	enum nes_timer_type {
	NES_TIMER_TYPE_SEND,
	NES_TIMER_TYPE_RECV,
	NES_TIMER_NODE_CLEANUP,
	NES_TIMER_TYPE_CLOSE,
	};

	#define NES_PASSIVE_STATE_INDICATED 0
	#define NES_DO_NOT_SEND_RESET_EVENT 1
	#define NES_SEND_RESET_EVENT 2

	#define MAX_NES_IFS 4

	#define SET_ACK 1
	#define SET_SYN 2
	#define SET_FIN 4
	#define SET_RST 8

	#define TCP_OPTIONS_PADDING 3

	struct option_base {
	u8 optionnum;
	u8 length;
	};

	enum option_numbers {
	OPTION_NUMBER_END,
	OPTION_NUMBER_NONE,
	OPTION_NUMBER_MSS,
	OPTION_NUMBER_WINDOW_SCALE,
	OPTION_NUMBER_SACK_PERM,
	OPTION_NUMBER_SACK,
	OPTION_NUMBER_WRITE0 = 0xbc
	};

	struct option_mss {
	u8 optionnum;
	u8 length;
	__be16 mss;
	};

	struct option_windowscale {
	u8 optionnum;
	u8 length;
	u8 shiftcount;
	};

	union all_known_options {
	char as_end;
	struct option_base as_base;
	struct option_mss as_mss;
	struct option_windowscale as_windowscale;
	};

	struct nes_timer_entry {
	struct list_head list;
	unsigned long timetosend; /* jiffies */
	struct sk_buff *skb;
	u32 type;
	u32 retrycount;
	u32 retranscount;
	u32 context;
	u32 seq_num;
	u32 send_retrans;
	int close_when_complete;
	struct net_device *netdev;
	};

	#define NES_DEFAULT_RETRYS 64
	#define NES_DEFAULT_RETRANS 8
	#ifdef CONFIG_INFINIBAND_NES_DEBUG
	#define NES_RETRY_TIMEOUT (1000*HZ/1000)
	#else
	#define NES_RETRY_TIMEOUT (3000*HZ/1000)
	#endif
	#define NES_SHORT_TIME (10)
	#define NES_LONG_TIME (2000*HZ/1000)
	#define NES_MAX_TIMEOUT ((unsigned long) (12*HZ))

	#define NES_CM_HASHTABLE_SIZE 1024
	#define NES_CM_TCP_TIMER_INTERVAL 3000
	#define NES_CM_DEFAULT_MTU 1540
	#define NES_CM_DEFAULT_FRAME_CNT 10
	#define NES_CM_THREAD_STACK_SIZE 256
	#define NES_CM_DEFAULT_RCV_WND 64240 // before we know that window scaling is allowed
	#define NES_CM_DEFAULT_RCV_WND_SCALED 256960 // after we know that window scaling is allowed
	#define NES_CM_DEFAULT_RCV_WND_SCALE 2
	#define NES_CM_DEFAULT_FREE_PKTS 0x000A
	#define NES_CM_FREE_PKT_LO_WATERMARK 2

	#define NES_CM_DEFAULT_MSS 536

	#define NES_CM_DEF_SEQ 0x159bf75f
	#define NES_CM_DEF_LOCAL_ID 0x3b47

	#define NES_CM_DEF_SEQ2 0x18ed5740
	#define NES_CM_DEF_LOCAL_ID2 0xb807
	#define MAX_CM_BUFFER (IETF_MPA_FRAME_SIZE + IETF_RTR_MSG_SIZE + IETF_MAX_PRIV_DATA_LEN)

	typedef u32 nes_addr_t;

	#define nes_cm_tsa_context nes_qp_context

	struct nes_qp;

	/* cm node transition states */
	enum nes_cm_node_state {
	NES_CM_STATE_UNKNOWN,
	NES_CM_STATE_INITED,
	NES_CM_STATE_LISTENING,
	NES_CM_STATE_SYN_RCVD,
	NES_CM_STATE_SYN_SENT,
	NES_CM_STATE_ONE_SIDE_ESTABLISHED,
	NES_CM_STATE_ESTABLISHED,
	NES_CM_STATE_ACCEPTING,
	NES_CM_STATE_MPAREQ_SENT,
	NES_CM_STATE_MPAREQ_RCVD,
	NES_CM_STATE_MPAREJ_RCVD,
	NES_CM_STATE_TSA,
	NES_CM_STATE_FIN_WAIT1,
	NES_CM_STATE_FIN_WAIT2,
	NES_CM_STATE_CLOSE_WAIT,
	NES_CM_STATE_TIME_WAIT,
	NES_CM_STATE_LAST_ACK,
	NES_CM_STATE_CLOSING,
	NES_CM_STATE_LISTENER_DESTROYED,
	NES_CM_STATE_CLOSED
	};

	enum mpa_frame_version {
	IETF_MPA_V1 = 1,
	IETF_MPA_V2 = 2
	};

	enum mpa_frame_key {
	MPA_KEY_REQUEST,
	MPA_KEY_REPLY
	};

	enum send_rdma0 {
	SEND_RDMA_READ_ZERO = 1,
	SEND_RDMA_WRITE_ZERO = 2
	};

	enum nes_tcpip_pkt_type {
	NES_PKT_TYPE_UNKNOWN,
	NES_PKT_TYPE_SYN,
	NES_PKT_TYPE_SYNACK,
	NES_PKT_TYPE_ACK,
	NES_PKT_TYPE_FIN,
	NES_PKT_TYPE_RST
	};


	/* type of nes connection */
	enum nes_cm_conn_type {
	NES_CM_IWARP_CONN_TYPE,
	};

	/* CM context params */
	struct nes_cm_tcp_context {
	u8 client;

	u32 loc_seq_num;
	u32 loc_ack_num;
	u32 rem_ack_num;
	u32 rcv_nxt;

	u32 loc_id;
	u32 rem_id;

	u32 snd_wnd;
	u32 max_snd_wnd;

	u32 rcv_wnd;
	u32 mss;
	u8 snd_wscale;
	u8 rcv_wscale;

	struct nes_cm_tsa_context tsa_cntxt;
	struct timeval sent_ts;
	};


	enum nes_cm_listener_state {
	NES_CM_LISTENER_PASSIVE_STATE = 1,
	NES_CM_LISTENER_ACTIVE_STATE = 2,
	NES_CM_LISTENER_EITHER_STATE = 3
	};

	struct nes_cm_listener {
	struct list_head list;
	struct nes_cm_core *cm_core;
	u8 loc_mac[ETH_ALEN];
	nes_addr_t loc_addr;
	u16 loc_port;
	struct iw_cm_id *cm_id;
	enum nes_cm_conn_type conn_type;
	atomic_t ref_count;
	struct nes_vnic *nesvnic;
	atomic_t pend_accepts_cnt;
	int backlog;
	enum nes_cm_listener_state listener_state;
	u32 reused_node;
	};

	/* per connection node and node state information */
	struct nes_cm_node {
	nes_addr_t loc_addr, rem_addr;
	u16 loc_port, rem_port;

	u8 loc_mac[ETH_ALEN];
	u8 rem_mac[ETH_ALEN];

	enum nes_cm_node_state state;
	struct nes_cm_tcp_context tcp_cntxt;
	struct nes_cm_core *cm_core;
	struct sk_buff_head resend_list;
	atomic_t ref_count;
	struct net_device *netdev;

	struct nes_cm_node *loopbackpartner;

	struct nes_timer_entry *send_entry;
	struct nes_timer_entry *recv_entry;
	spinlock_t retrans_list_lock;
	enum send_rdma0 send_rdma0_op;

	union {
	struct ietf_mpa_v1 mpa_frame;
	struct ietf_mpa_v2 mpa_v2_frame;
	u8 mpa_frame_buf[MAX_CM_BUFFER];
	};
	enum mpa_frame_version mpa_frame_rev;
	u16 ird_size;
	u16 ord_size;
	u16 mpav2_ird_ord;

	u16 mpa_frame_size;
	struct iw_cm_id *cm_id;
	struct list_head list;
	int accelerated;
	struct nes_cm_listener *listener;
	enum nes_cm_conn_type conn_type;
	struct nes_vnic *nesvnic;
	int apbvt_set;
	int accept_pend;
	struct list_head timer_entry;
	struct list_head reset_entry;
	struct nes_qp *nesqp;
	atomic_t passive_state;
	};

	/* structure for client or CM to fill when making CM api calls. */
	/* - only need to set relevant data, based on op. */
	struct nes_cm_info {
	union {
	struct iw_cm_id *cm_id;
	struct net_device *netdev;
	};

	u16 loc_port;
	u16 rem_port;
	nes_addr_t loc_addr;
	nes_addr_t rem_addr;

	enum nes_cm_conn_type conn_type;
	int backlog;
	};

	/* CM event codes */
	enum nes_cm_event_type {
	NES_CM_EVENT_UNKNOWN,
	NES_CM_EVENT_ESTABLISHED,
	NES_CM_EVENT_MPA_REQ,
	NES_CM_EVENT_MPA_CONNECT,
	NES_CM_EVENT_MPA_ACCEPT,
	NES_CM_EVENT_MPA_REJECT,
	NES_CM_EVENT_MPA_ESTABLISHED,
	NES_CM_EVENT_CONNECTED,
	NES_CM_EVENT_CLOSED,
	NES_CM_EVENT_RESET,
	NES_CM_EVENT_DROPPED_PKT,
	NES_CM_EVENT_CLOSE_IMMED,
	NES_CM_EVENT_CLOSE_HARD,
	NES_CM_EVENT_CLOSE_CLEAN,
	NES_CM_EVENT_ABORTED,
	NES_CM_EVENT_SEND_FIRST
	};

	/* event to post to CM event handler */
	struct nes_cm_event {
	enum nes_cm_event_type type;

	struct nes_cm_info cm_info;
	struct work_struct event_work;
	struct nes_cm_node *cm_node;
	};

	struct nes_cm_core {
	enum nes_cm_node_state state;

	atomic_t listen_node_cnt;
	struct nes_cm_node listen_list;
	spinlock_t listen_list_lock;

	u32 mtu;
	u32 free_tx_pkt_max;
	u32 rx_pkt_posted;
	atomic_t ht_node_cnt;
	struct list_head connected_nodes;
	/* struct list_head hashtable[NES_CM_HASHTABLE_SIZE]; */
	spinlock_t ht_lock;

	struct timer_list tcp_timer;

	struct nes_cm_ops *api;

	int (post_event)(struct nes_cm_event event);
	atomic_t events_posted;
	struct workqueue_struct *event_wq;
	struct workqueue_struct *disconn_wq;

	atomic_t node_cnt;
	u64 aborted_connects;
	u32 options;

	struct nes_cm_node *current_listen_node;
	};


	#define NES_CM_SET_PKT_SIZE (1 << 1)
	#define NES_CM_SET_FREE_PKT_Q_SIZE (1 << 2)

	/* CM ops/API for client interface */
	struct nes_cm_ops {
	int (accelerated)(struct nes_cm_core , struct nes_cm_node *);
	struct nes_cm_listener * (listen)(struct nes_cm_core , struct nes_vnic *,
	struct nes_cm_info *);
	int (stop_listener)(struct nes_cm_core , struct nes_cm_listener *);
	struct nes_cm_node * (connect)(struct nes_cm_core ,
	struct nes_vnic , u16, void ,
	struct nes_cm_info *);
	int (close)(struct nes_cm_core , struct nes_cm_node *);
	int (accept)(struct nes_cm_core , struct nes_cm_node *);
	int (reject)(struct nes_cm_core , struct nes_cm_node *);
	int (recv_pkt)(struct nes_cm_core , struct nes_vnic *,
	struct sk_buff *);
	int (destroy_cm_core)(struct nes_cm_core );
	int (get)(struct nes_cm_core );
	int (set)(struct nes_cm_core , u32, u32);
	};

	int schedule_nes_timer(struct nes_cm_node , struct sk_buff ,
	enum nes_timer_type, int, int);

	int nes_accept(struct iw_cm_id , struct iw_cm_conn_param );
	int nes_reject(struct iw_cm_id , const void , u8);
	int nes_connect(struct iw_cm_id , struct iw_cm_conn_param );
	int nes_create_listen(struct iw_cm_id *, int);
	int nes_destroy_listen(struct iw_cm_id *);

	int nes_cm_recv(struct sk_buff , struct net_device );
	int nes_cm_start(void);
	int nes_cm_stop(void);
	int nes_add_ref_cm_node(struct nes_cm_node *cm_node);
	int nes_rem_ref_cm_node(struct nes_cm_node *cm_node);

	#endif /* NES_CM_H */