/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2004 Voltaire, 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 _IPOIB_H
#define _IPOIB_H

#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/workqueue.h>
#include <linux/kref.h>
#include <linux/if_infiniband.h>
#include <linux/mutex.h>

#include <net/neighbour.h>
#include <net/sch_generic.h>

#include <linux/atomic.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_sa.h>
#include <linux/sched.h>
/* constants */

enum ipoib_flush_level {
        IPOIB_FLUSH_LIGHT,
        IPOIB_FLUSH_NORMAL,
        IPOIB_FLUSH_HEAVY
};

enum {
        IPOIB_ENCAP_LEN           = 4,
        IPOIB_PSEUDO_LEN          = 20,
        IPOIB_HARD_LEN            = IPOIB_ENCAP_LEN + IPOIB_PSEUDO_LEN,

        IPOIB_UD_HEAD_SIZE        = IB_GRH_BYTES + IPOIB_ENCAP_LEN,
        IPOIB_UD_RX_SG            = 2, /* max buffer needed for 4K mtu */

        IPOIB_CM_MTU              = 0x10000 - 0x10, /* padding to align header to 16 */
        IPOIB_CM_BUF_SIZE         = IPOIB_CM_MTU  + IPOIB_ENCAP_LEN,
        IPOIB_CM_HEAD_SIZE        = IPOIB_CM_BUF_SIZE % PAGE_SIZE,
        IPOIB_CM_RX_SG            = ALIGN(IPOIB_CM_BUF_SIZE, PAGE_SIZE) / PAGE_SIZE,
        IPOIB_RX_RING_SIZE        = 256,
        IPOIB_TX_RING_SIZE        = 128,
        IPOIB_MAX_QUEUE_SIZE      = 8192,
        IPOIB_MIN_QUEUE_SIZE      = 2,
        IPOIB_CM_MAX_CONN_QP      = 4096,

        IPOIB_NUM_WC              = 4,

        IPOIB_MAX_PATH_REC_QUEUE  = 3,
        IPOIB_MAX_MCAST_QUEUE     = 64,

        IPOIB_FLAG_OPER_UP        = 0,
        IPOIB_FLAG_INITIALIZED    = 1,
        IPOIB_FLAG_ADMIN_UP       = 2,
        IPOIB_PKEY_ASSIGNED       = 3,
        IPOIB_FLAG_SUBINTERFACE   = 5,
        IPOIB_STOP_REAPER         = 7,
        IPOIB_FLAG_ADMIN_CM       = 9,
        IPOIB_FLAG_UMCAST         = 10,
        IPOIB_NEIGH_TBL_FLUSH     = 12,
        IPOIB_FLAG_DEV_ADDR_SET   = 13,
        IPOIB_FLAG_DEV_ADDR_CTRL  = 14,

        IPOIB_MAX_BACKOFF_SECONDS = 16,

        IPOIB_MCAST_FLAG_FOUND    = 0,  /* used in set_multicast_list */
        IPOIB_MCAST_FLAG_SENDONLY = 1,
        /*
         * For IPOIB_MCAST_FLAG_BUSY
         * When set, in flight join and mcast->mc is unreliable
         * When clear and mcast->mc IS_ERR_OR_NULL, need to restart or
         *   haven't started yet
         * When clear and mcast->mc is valid pointer, join was successful
         */
        IPOIB_MCAST_FLAG_BUSY     = 2,
        IPOIB_MCAST_FLAG_ATTACHED = 3,

        MAX_SEND_CQE              = 64,
        IPOIB_CM_COPYBREAK        = 256,

        IPOIB_NON_CHILD           = 0,
        IPOIB_LEGACY_CHILD        = 1,
        IPOIB_RTNL_CHILD          = 2,
};

#define IPOIB_OP_RECV   (1ul << 31)
#ifdef CONFIG_INFINIBAND_IPOIB_CM
#define IPOIB_OP_CM     (1ul << 30)
#else
#define IPOIB_OP_CM     (0)
#endif

#define IPOIB_QPN_MASK ((__force u32) cpu_to_be32(0xFFFFFF))

/* structs */

struct ipoib_header {
        __be16  proto;
        u16     reserved;
};

struct ipoib_pseudo_header {
        u8      hwaddr[INFINIBAND_ALEN];
};

static inline void skb_add_pseudo_hdr(struct sk_buff *skb)
{
        char *data = skb_push(skb, IPOIB_PSEUDO_LEN);

        /*
         * only the ipoib header is present now, make room for a dummy
         * pseudo header and set skb field accordingly
         */
        memset(data, 0, IPOIB_PSEUDO_LEN);
        skb_reset_mac_header(skb);
        skb_pull(skb, IPOIB_HARD_LEN);
}

static inline struct ipoib_dev_priv *ipoib_priv(const struct net_device *dev)
{
        struct rdma_netdev *rn = netdev_priv(dev);

        return rn->clnt_priv;
}

/* Used for all multicast joins (broadcast, IPv4 mcast and IPv6 mcast) */
struct ipoib_mcast {
        struct ib_sa_mcmember_rec mcmember;
        struct ib_sa_multicast   *mc;
        struct ipoib_ah          *ah;

        struct rb_node    rb_node;
        struct list_head  list;

        unsigned long created;
        unsigned long backoff;
        unsigned long delay_until;

        unsigned long flags;
        unsigned char logcount;

        struct list_head  neigh_list;

        struct sk_buff_head pkt_queue;

        struct net_device *dev;
        struct completion done;
};

struct ipoib_rx_buf {
        struct sk_buff *skb;
        u64             mapping[IPOIB_UD_RX_SG];
};

struct ipoib_tx_buf {
        struct sk_buff *skb;
        u64             mapping[MAX_SKB_FRAGS + 1];
};

struct ib_cm_id;

struct ipoib_cm_data {
        __be32 qpn; /* High byte MUST be ignored on receive */
        __be32 mtu;
};

/*
 * Quoting 10.3.1 Queue Pair and EE Context States:
 *
 * Note, for QPs that are associated with an SRQ, the Consumer should take the
 * QP through the Error State before invoking a Destroy QP or a Modify QP to the
 * Reset State.  The Consumer may invoke the Destroy QP without first performing
 * a Modify QP to the Error State and waiting for the Affiliated Asynchronous
 * Last WQE Reached Event. However, if the Consumer does not wait for the
 * Affiliated Asynchronous Last WQE Reached Event, then WQE and Data Segment
 * leakage may occur. Therefore, it is good programming practice to tear down a
 * QP that is associated with an SRQ by using the following process:
 *
 * - Put the QP in the Error State
 * - Wait for the Affiliated Asynchronous Last WQE Reached Event;
 * - either:
 *       drain the CQ by invoking the Poll CQ verb and either wait for CQ
 *       to be empty or the number of Poll CQ operations has exceeded
 *       CQ capacity size;
 * - or
 *       post another WR that completes on the same CQ and wait for this
 *       WR to return as a WC;
 * - and then invoke a Destroy QP or Reset QP.
 *
 * We use the second option and wait for a completion on the
 * same CQ before destroying QPs attached to our SRQ.
 */

enum ipoib_cm_state {
        IPOIB_CM_RX_LIVE,
        IPOIB_CM_RX_ERROR, /* Ignored by stale task */
        IPOIB_CM_RX_FLUSH  /* Last WQE Reached event observed */
};

struct ipoib_cm_rx {
        struct ib_cm_id        *id;
        struct ib_qp           *qp;
        struct ipoib_cm_rx_buf *rx_ring;
        struct list_head        list;
        struct net_device      *dev;
        unsigned long           jiffies;
        enum ipoib_cm_state     state;
        int                     recv_count;
};

struct ipoib_cm_tx {
        struct ib_cm_id     *id;
        struct ib_qp        *qp;
        struct list_head     list;
        struct net_device   *dev;
        struct ipoib_neigh  *neigh;
        struct ipoib_tx_buf *tx_ring;
        unsigned int         tx_head;
        unsigned int         tx_tail;
        unsigned long        flags;
        u32                  mtu;
        unsigned int         max_send_sge;
};

struct ipoib_cm_rx_buf {
        struct sk_buff *skb;
        u64 mapping[IPOIB_CM_RX_SG];
};

struct ipoib_cm_dev_priv {
        struct ib_srq          *srq;
        struct ipoib_cm_rx_buf *srq_ring;
        struct ib_cm_id        *id;
        struct list_head        passive_ids;   /* state: LIVE */
        struct list_head        rx_error_list; /* state: ERROR */
        struct list_head        rx_flush_list; /* state: FLUSH, drain not started */
        struct list_head        rx_drain_list; /* state: FLUSH, drain started */
        struct list_head        rx_reap_list;  /* state: FLUSH, drain done */
        struct work_struct      start_task;
        struct work_struct      reap_task;
        struct work_struct      skb_task;
        struct work_struct      rx_reap_task;
        struct delayed_work     stale_task;
        struct sk_buff_head     skb_queue;
        struct list_head        start_list;
        struct list_head        reap_list;
        struct ib_wc            ibwc[IPOIB_NUM_WC];
        struct ib_sge           rx_sge[IPOIB_CM_RX_SG];
        struct ib_recv_wr       rx_wr;
        int                     nonsrq_conn_qp;
        int                     max_cm_mtu;
        int                     num_frags;
};

struct ipoib_ethtool_st {
        u16     coalesce_usecs;
        u16     max_coalesced_frames;
};

struct ipoib_neigh_table;

struct ipoib_neigh_hash {
        struct ipoib_neigh_table       *ntbl;
        struct ipoib_neigh __rcu      **buckets;
        struct rcu_head                 rcu;
        u32                             mask;
        u32                             size;
};

struct ipoib_neigh_table {
        struct ipoib_neigh_hash __rcu  *htbl;
        atomic_t                        entries;
        struct completion               flushed;
        struct completion               deleted;
};

struct ipoib_qp_state_validate {
        struct work_struct work;
        struct ipoib_dev_priv   *priv;
};

/*
 * Device private locking: network stack tx_lock protects members used
 * in TX fast path, lock protects everything else.  lock nests inside
 * of tx_lock (ie tx_lock must be acquired first if needed).
 */
struct ipoib_dev_priv {
        spinlock_t lock;

        struct net_device *dev;
        void (*next_priv_destructor)(struct net_device *dev);

        struct napi_struct send_napi;
        struct napi_struct recv_napi;

        unsigned long flags;

        /*
         * This protects access to the child_intfs list.
         * To READ from child_intfs the RTNL or vlan_rwsem read side must be
         * held.  To WRITE RTNL and the vlan_rwsem write side must be held (in
         * that order) This lock exists because we have a few contexts where
         * we need the child_intfs, but do not want to grab the RTNL.
         */
        struct rw_semaphore vlan_rwsem;
        struct mutex mcast_mutex;

        struct rb_root  path_tree;
        struct list_head path_list;

        struct ipoib_neigh_table ntbl;

        struct ipoib_mcast *broadcast;
        struct list_head multicast_list;
        struct rb_root multicast_tree;

        struct workqueue_struct *wq;
        struct delayed_work mcast_task;
        struct work_struct carrier_on_task;
        struct work_struct flush_light;
        struct work_struct flush_normal;
        struct work_struct flush_heavy;
        struct work_struct restart_task;
        struct delayed_work ah_reap_task;
        struct delayed_work neigh_reap_task;
        struct ib_device *ca;
        u8                port;
        u16               pkey;
        u16               pkey_index;
        struct ib_pd     *pd;
        struct ib_cq     *recv_cq;
        struct ib_cq     *send_cq;
        struct ib_qp     *qp;
        u32               qkey;

        union ib_gid local_gid;
        u32          local_lid;

        unsigned int admin_mtu;
        unsigned int mcast_mtu;
        unsigned int max_ib_mtu;

        struct ipoib_rx_buf *rx_ring;

        struct ipoib_tx_buf *tx_ring;
        /* cyclic ring variables for managing tx_ring, for UD only */
        unsigned int         tx_head;
        unsigned int         tx_tail;
        /* cyclic ring variables for counting overall outstanding send WRs */
        unsigned int         global_tx_head;
        unsigned int         global_tx_tail;
        struct ib_sge        tx_sge[MAX_SKB_FRAGS + 1];
        struct ib_ud_wr      tx_wr;
        struct ib_wc         send_wc[MAX_SEND_CQE];

        struct ib_recv_wr    rx_wr;
        struct ib_sge        rx_sge[IPOIB_UD_RX_SG];

        struct ib_wc ibwc[IPOIB_NUM_WC];

        struct list_head dead_ahs;

        struct ib_event_handler event_handler;

        struct net_device *parent;
        struct list_head child_intfs;
        struct list_head list;
        int    child_type;

#ifdef CONFIG_INFINIBAND_IPOIB_CM
        struct ipoib_cm_dev_priv cm;
#endif

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
        struct list_head fs_list;
        struct dentry *mcg_dentry;
        struct dentry *path_dentry;
#endif
        u64     hca_caps;
        struct ipoib_ethtool_st ethtool;
        unsigned int max_send_sge;
        const struct net_device_ops     *rn_ops;
};

struct ipoib_ah {
        struct net_device *dev;
        struct ib_ah      *ah;
        struct list_head   list;
        struct kref        ref;
        unsigned int       last_send;
        int                valid;
};

struct ipoib_path {
        struct net_device    *dev;
        struct sa_path_rec pathrec;
        struct ipoib_ah      *ah;
        struct sk_buff_head   queue;

        struct list_head      neigh_list;

        int                   query_id;
        struct ib_sa_query   *query;
        struct completion     done;

        struct rb_node        rb_node;
        struct list_head      list;
};

struct ipoib_neigh {
        struct ipoib_ah    *ah;
#ifdef CONFIG_INFINIBAND_IPOIB_CM
        struct ipoib_cm_tx *cm;
#endif
        u8     daddr[INFINIBAND_ALEN];
        struct sk_buff_head queue;

        struct net_device *dev;

        struct list_head    list;
        struct ipoib_neigh __rcu *hnext;
        struct rcu_head     rcu;
        refcount_t          refcnt;
        unsigned long       alive;
};

#define IPOIB_UD_MTU(ib_mtu)            (ib_mtu - IPOIB_ENCAP_LEN)
#define IPOIB_UD_BUF_SIZE(ib_mtu)       (ib_mtu + IB_GRH_BYTES)

void ipoib_neigh_dtor(struct ipoib_neigh *neigh);
static inline void ipoib_neigh_put(struct ipoib_neigh *neigh)
{
        if (refcount_dec_and_test(&neigh->refcnt))
                ipoib_neigh_dtor(neigh);
}
struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr);
struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
                                      struct net_device *dev);
void ipoib_neigh_free(struct ipoib_neigh *neigh);
void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid);

extern struct workqueue_struct *ipoib_workqueue;

/* functions */

int ipoib_rx_poll(struct napi_struct *napi, int budget);
int ipoib_tx_poll(struct napi_struct *napi, int budget);
void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr);
void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr);

struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
                                 struct ib_pd *pd, struct rdma_ah_attr *attr);
void ipoib_free_ah(struct kref *kref);
static inline void ipoib_put_ah(struct ipoib_ah *ah)
{
        kref_put(&ah->ref, ipoib_free_ah);
}
int ipoib_open(struct net_device *dev);
void ipoib_intf_free(struct net_device *dev);
int ipoib_add_pkey_attr(struct net_device *dev);
int ipoib_add_umcast_attr(struct net_device *dev);

int ipoib_send(struct net_device *dev, struct sk_buff *skb,
               struct ib_ah *address, u32 dqpn);
void ipoib_reap_ah(struct work_struct *work);

struct ipoib_path *__path_find(struct net_device *dev, void *gid);
void ipoib_mark_paths_invalid(struct net_device *dev);
void ipoib_flush_paths(struct net_device *dev);
struct net_device *ipoib_intf_alloc(struct ib_device *hca, u32 port,
                                    const char *format);
int ipoib_intf_init(struct ib_device *hca, u32 port, const char *format,
                    struct net_device *dev);
void ipoib_ib_tx_timer_func(struct timer_list *t);
void ipoib_ib_dev_flush_light(struct work_struct *work);
void ipoib_ib_dev_flush_normal(struct work_struct *work);
void ipoib_ib_dev_flush_heavy(struct work_struct *work);
void ipoib_pkey_event(struct work_struct *work);
void ipoib_ib_dev_cleanup(struct net_device *dev);

int ipoib_ib_dev_open_default(struct net_device *dev);
int ipoib_ib_dev_open(struct net_device *dev);
void ipoib_ib_dev_stop(struct net_device *dev);
void ipoib_ib_dev_up(struct net_device *dev);
void ipoib_ib_dev_down(struct net_device *dev);
int ipoib_ib_dev_stop_default(struct net_device *dev);
void ipoib_pkey_dev_check_presence(struct net_device *dev);

void ipoib_mcast_join_task(struct work_struct *work);
void ipoib_mcast_carrier_on_task(struct work_struct *work);
void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb);

void ipoib_mcast_restart_task(struct work_struct *work);
void ipoib_mcast_start_thread(struct net_device *dev);
void ipoib_mcast_stop_thread(struct net_device *dev);

void ipoib_mcast_dev_down(struct net_device *dev);
void ipoib_mcast_dev_flush(struct net_device *dev);

int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req);
void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
                        struct ipoib_tx_buf *tx_req);

struct rtnl_link_ops *ipoib_get_link_ops(void);

static inline void ipoib_build_sge(struct ipoib_dev_priv *priv,
                                   struct ipoib_tx_buf *tx_req)
{
        int i, off;
        struct sk_buff *skb = tx_req->skb;
        skb_frag_t *frags = skb_shinfo(skb)->frags;
        int nr_frags = skb_shinfo(skb)->nr_frags;
        u64 *mapping = tx_req->mapping;

        if (skb_headlen(skb)) {
                priv->tx_sge[0].addr         = mapping[0];
                priv->tx_sge[0].length       = skb_headlen(skb);
                off = 1;
        } else
                off = 0;

        for (i = 0; i < nr_frags; ++i) {
                priv->tx_sge[i + off].addr = mapping[i + off];
                priv->tx_sge[i + off].length = skb_frag_size(&frags[i]);
        }
        priv->tx_wr.wr.num_sge       = nr_frags + off;
}

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev);
int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter);
void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
                                  union ib_gid *gid,
                                  unsigned long *created,
                                  unsigned int *queuelen,
                                  unsigned int *complete,
                                  unsigned int *send_only);

struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev);
int ipoib_path_iter_next(struct ipoib_path_iter *iter);
void ipoib_path_iter_read(struct ipoib_path_iter *iter,
                          struct ipoib_path *path);
#endif

int ipoib_mcast_attach(struct net_device *dev, struct ib_device *hca,
                       union ib_gid *mgid, u16 mlid, int set_qkey, u32 qkey);
int ipoib_mcast_detach(struct net_device *dev, struct ib_device *hca,
                       union ib_gid *mgid, u16 mlid);
void ipoib_mcast_remove_list(struct list_head *remove_list);
void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid,
                                struct list_head *remove_list);

int ipoib_init_qp(struct net_device *dev);
int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca);
void ipoib_transport_dev_cleanup(struct net_device *dev);

void ipoib_event(struct ib_event_handler *handler,
                 struct ib_event *record);

int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey);
int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey);

int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
                     u16 pkey, int child_type);

int  __init ipoib_netlink_init(void);
void __exit ipoib_netlink_fini(void);

void ipoib_set_umcast(struct net_device *ndev, int umcast_val);
int  ipoib_set_mode(struct net_device *dev, const char *buf);

void ipoib_setup_common(struct net_device *dev);

void ipoib_pkey_open(struct ipoib_dev_priv *priv);
void ipoib_drain_cq(struct net_device *dev);

void ipoib_set_ethtool_ops(struct net_device *dev);

#define IPOIB_FLAGS_RC          0x80
#define IPOIB_FLAGS_UC          0x40

/* We don't support UC connections at the moment */
#define IPOIB_CM_SUPPORTED(ha)   (ha[0] & (IPOIB_FLAGS_RC))

#ifdef CONFIG_INFINIBAND_IPOIB_CM

extern int ipoib_max_conn_qp;

static inline int ipoib_cm_admin_enabled(struct net_device *dev)
{
        struct ipoib_dev_priv *priv = ipoib_priv(dev);
        return IPOIB_CM_SUPPORTED(dev->dev_addr) &&
                test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
}

static inline int ipoib_cm_enabled(struct net_device *dev, u8 *hwaddr)
{
        struct ipoib_dev_priv *priv = ipoib_priv(dev);
        return IPOIB_CM_SUPPORTED(hwaddr) &&
                test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
}

static inline int ipoib_cm_up(struct ipoib_neigh *neigh)

{
        return test_bit(IPOIB_FLAG_OPER_UP, &neigh->cm->flags);
}

static inline struct ipoib_cm_tx *ipoib_cm_get(struct ipoib_neigh *neigh)
{
        return neigh->cm;
}

static inline void ipoib_cm_set(struct ipoib_neigh *neigh, struct ipoib_cm_tx *tx)
{
        neigh->cm = tx;
}

static inline int ipoib_cm_has_srq(struct net_device *dev)
{
        struct ipoib_dev_priv *priv = ipoib_priv(dev);
        return !!priv->cm.srq;
}

static inline unsigned int ipoib_cm_max_mtu(struct net_device *dev)
{
        struct ipoib_dev_priv *priv = ipoib_priv(dev);
        return priv->cm.max_cm_mtu;
}

void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx);
int ipoib_cm_dev_open(struct net_device *dev);
void ipoib_cm_dev_stop(struct net_device *dev);
int ipoib_cm_dev_init(struct net_device *dev);
int ipoib_cm_add_mode_attr(struct net_device *dev);
void ipoib_cm_dev_cleanup(struct net_device *dev);
struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
                                    struct ipoib_neigh *neigh);
void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx);
void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
                           unsigned int mtu);
void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc);
void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc);
#else

#define ipoib_max_conn_qp 0

static inline int ipoib_cm_admin_enabled(struct net_device *dev)
{
        return 0;
}
static inline int ipoib_cm_enabled(struct net_device *dev, u8 *hwaddr)

{
        return 0;
}

static inline int ipoib_cm_up(struct ipoib_neigh *neigh)

{
        return 0;
}

static inline struct ipoib_cm_tx *ipoib_cm_get(struct ipoib_neigh *neigh)
{
        return NULL;
}

static inline void ipoib_cm_set(struct ipoib_neigh *neigh, struct ipoib_cm_tx *tx)
{
}

static inline int ipoib_cm_has_srq(struct net_device *dev)
{
        return 0;
}

static inline unsigned int ipoib_cm_max_mtu(struct net_device *dev)
{
        return 0;
}

static inline
void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
{
        return;
}

static inline
int ipoib_cm_dev_open(struct net_device *dev)
{
        return 0;
}

static inline
void ipoib_cm_dev_stop(struct net_device *dev)
{
        return;
}

static inline
int ipoib_cm_dev_init(struct net_device *dev)
{
        return -EOPNOTSUPP;
}

static inline
void ipoib_cm_dev_cleanup(struct net_device *dev)
{
        return;
}

static inline
struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
                                    struct ipoib_neigh *neigh)
{
        return NULL;
}

static inline
void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
{
        return;
}

static inline
int ipoib_cm_add_mode_attr(struct net_device *dev)
{
        return 0;
}

static inline void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
                                         unsigned int mtu)
{
        dev_kfree_skb_any(skb);
}

static inline void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
{
}

static inline void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
{
}
#endif

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
void ipoib_create_debug_files(struct net_device *dev);
void ipoib_delete_debug_files(struct net_device *dev);
void ipoib_register_debugfs(void);
void ipoib_unregister_debugfs(void);
#else
static inline void ipoib_create_debug_files(struct net_device *dev) { }
static inline void ipoib_delete_debug_files(struct net_device *dev) { }
static inline void ipoib_register_debugfs(void) { }
static inline void ipoib_unregister_debugfs(void) { }
#endif

#define ipoib_printk(level, priv, format, arg...)       \
        printk(level "%s: " format, ((struct ipoib_dev_priv *) priv)->dev->name , ## arg)
#define ipoib_warn(priv, format, arg...)                \
do {                                                    \
        static DEFINE_RATELIMIT_STATE(_rs,              \
                10 * HZ /*10 seconds */,                \
                100);           \
        if (__ratelimit(&_rs))                          \
                ipoib_printk(KERN_WARNING, priv, format , ## arg);\
} while (0)

extern int ipoib_sendq_size;
extern int ipoib_recvq_size;

extern struct ib_sa_client ipoib_sa_client;

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
extern int ipoib_debug_level;

#define ipoib_dbg(priv, format, arg...)                 \
        do {                                            \
                if (ipoib_debug_level > 0)                      \
                        ipoib_printk(KERN_DEBUG, priv, format , ## arg); \
        } while (0)
#define ipoib_dbg_mcast(priv, format, arg...)           \
        do {                                            \
                if (mcast_debug_level > 0)              \
                        ipoib_printk(KERN_DEBUG, priv, format , ## arg); \
        } while (0)
#else /* CONFIG_INFINIBAND_IPOIB_DEBUG */
#define ipoib_dbg(priv, format, arg...)                 \
        do { (void) (priv); } while (0)
#define ipoib_dbg_mcast(priv, format, arg...)           \
        do { (void) (priv); } while (0)
#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
#define ipoib_dbg_data(priv, format, arg...)            \
        do {                                            \
                if (data_debug_level > 0)               \
                        ipoib_printk(KERN_DEBUG, priv, format , ## arg); \
        } while (0)
#else /* CONFIG_INFINIBAND_IPOIB_DEBUG_DATA */
#define ipoib_dbg_data(priv, format, arg...)            \
        do { (void) (priv); } while (0)
#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG_DATA */

#define IPOIB_QPN(ha) (be32_to_cpup((__be32 *) ha) & 0xffffff)

#endif /* _IPOIB_H */