/*
 * Copyright (c) 2006 Chelsio, Inc. 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 _IWCH_CM_H_
#define _IWCH_CM_H_

#include <linux/inet.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <linux/kref.h>

#include <rdma/ib_verbs.h>
#include <rdma/iw_cm.h>

#include "cxgb3_offload.h"
#include "iwch_provider.h"

#define MPA_KEY_REQ "MPA ID Req Frame"
#define MPA_KEY_REP "MPA ID Rep Frame"

#define MPA_MAX_PRIVATE_DATA    256
#define MPA_REV         0       /* XXX - amso1100 uses rev 0 ! */
#define MPA_REJECT              0x20
#define MPA_CRC                 0x40
#define MPA_MARKERS             0x80
#define MPA_FLAGS_MASK          0xE0

#define put_ep(ep) { \
        PDBG("put_ep (via %s:%u) ep %p refcnt %d\n", __func__, __LINE__,  \
             ep, atomic_read(&((ep)->kref.refcount))); \
        WARN_ON(atomic_read(&((ep)->kref.refcount)) < 1); \
        kref_put(&((ep)->kref), __free_ep); \
}

#define get_ep(ep) { \
        PDBG("get_ep (via %s:%u) ep %p, refcnt %d\n", __func__, __LINE__, \
             ep, atomic_read(&((ep)->kref.refcount))); \
        kref_get(&((ep)->kref));  \
}

struct mpa_message {
        u8 key[16];
        u8 flags;
        u8 revision;
        __be16 private_data_size;
        u8 private_data[0];
};

struct terminate_message {
        u8 layer_etype;
        u8 ecode;
        __be16 hdrct_rsvd;
        u8 len_hdrs[0];
};

#define TERM_MAX_LENGTH (sizeof(struct terminate_message) + 2 + 18 + 28)

enum iwch_layers_types {
        LAYER_RDMAP             = 0x00,
        LAYER_DDP               = 0x10,
        LAYER_MPA               = 0x20,
        RDMAP_LOCAL_CATA        = 0x00,
        RDMAP_REMOTE_PROT       = 0x01,
        RDMAP_REMOTE_OP         = 0x02,
        DDP_LOCAL_CATA          = 0x00,
        DDP_TAGGED_ERR          = 0x01,
        DDP_UNTAGGED_ERR        = 0x02,
        DDP_LLP                 = 0x03
};

enum iwch_rdma_ecodes {
        RDMAP_INV_STAG          = 0x00,
        RDMAP_BASE_BOUNDS       = 0x01,
        RDMAP_ACC_VIOL          = 0x02,
        RDMAP_STAG_NOT_ASSOC    = 0x03,
        RDMAP_TO_WRAP           = 0x04,
        RDMAP_INV_VERS          = 0x05,
        RDMAP_INV_OPCODE        = 0x06,
        RDMAP_STREAM_CATA       = 0x07,
        RDMAP_GLOBAL_CATA       = 0x08,
        RDMAP_CANT_INV_STAG     = 0x09,
        RDMAP_UNSPECIFIED       = 0xff
};

enum iwch_ddp_ecodes {
        DDPT_INV_STAG           = 0x00,
        DDPT_BASE_BOUNDS        = 0x01,
        DDPT_STAG_NOT_ASSOC     = 0x02,
        DDPT_TO_WRAP            = 0x03,
        DDPT_INV_VERS           = 0x04,
        DDPU_INV_QN             = 0x01,
        DDPU_INV_MSN_NOBUF      = 0x02,
        DDPU_INV_MSN_RANGE      = 0x03,
        DDPU_INV_MO             = 0x04,
        DDPU_MSG_TOOBIG         = 0x05,
        DDPU_INV_VERS           = 0x06
};

enum iwch_mpa_ecodes {
        MPA_CRC_ERR             = 0x02,
        MPA_MARKER_ERR          = 0x03
};

enum iwch_ep_state {
        IDLE = 0,
        LISTEN,
        CONNECTING,
        MPA_REQ_WAIT,
        MPA_REQ_SENT,
        MPA_REQ_RCVD,
        MPA_REP_SENT,
        FPDU_MODE,
        ABORTING,
        CLOSING,
        MORIBUND,
        DEAD,
};

enum iwch_ep_flags {
        PEER_ABORT_IN_PROGRESS  = 0,
        ABORT_REQ_IN_PROGRESS   = 1,
        RELEASE_RESOURCES       = 2,
        CLOSE_SENT              = 3,
};

struct iwch_ep_common {
        struct iw_cm_id *cm_id;
        struct iwch_qp *qp;
        struct t3cdev *tdev;
        enum iwch_ep_state state;
        struct kref kref;
        spinlock_t lock;
        struct sockaddr_in local_addr;
        struct sockaddr_in remote_addr;
        wait_queue_head_t waitq;
        int rpl_done;
        int rpl_err;
        unsigned long flags;
};

struct iwch_listen_ep {
        struct iwch_ep_common com;
        unsigned int stid;
        int backlog;
};

struct iwch_ep {
        struct iwch_ep_common com;
        struct iwch_ep *parent_ep;
        struct timer_list timer;
        unsigned int atid;
        u32 hwtid;
        u32 snd_seq;
        u32 rcv_seq;
        struct l2t_entry *l2t;
        struct dst_entry *dst;
        struct sk_buff *mpa_skb;
        struct iwch_mpa_attributes mpa_attr;
        unsigned int mpa_pkt_len;
        u8 mpa_pkt[sizeof(struct mpa_message) + MPA_MAX_PRIVATE_DATA];
        u8 tos;
        u16 emss;
        u16 plen;
        u32 ird;
        u32 ord;
};

static inline struct iwch_ep *to_ep(struct iw_cm_id *cm_id)
{
        return cm_id->provider_data;
}

static inline struct iwch_listen_ep *to_listen_ep(struct iw_cm_id *cm_id)
{
        return cm_id->provider_data;
}

static inline int compute_wscale(int win)
{
        int wscale = 0;

        while (wscale < 14 && (65535<<wscale) < win)
                wscale++;
        return wscale;
}

/* CM prototypes */

int iwch_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param);
int iwch_create_listen(struct iw_cm_id *cm_id, int backlog);
int iwch_destroy_listen(struct iw_cm_id *cm_id);
int iwch_reject_cr(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len);
int iwch_accept_cr(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param);
int iwch_ep_disconnect(struct iwch_ep *ep, int abrupt, gfp_t gfp);
int iwch_quiesce_tid(struct iwch_ep *ep);
int iwch_resume_tid(struct iwch_ep *ep);
void __free_ep(struct kref *kref);
void iwch_rearp(struct iwch_ep *ep);
int iwch_ep_redirect(void *ctx, struct dst_entry *old, struct dst_entry *new, struct l2t_entry *l2t);

int __init iwch_cm_init(void);
void __exit iwch_cm_term(void);
extern int peer2peer;

#endif                          /* _IWCH_CM_H_ */