iwch_cm.h

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/*
 * 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_ */