nes_cm.c

Go to the documentation of this file.

/*
 * 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.
 *
 */


#define TCPOPT_TIMESTAMP 8

#include <linux/atomic.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/init.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/notifier.h>
#include <linux/net.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/random.h>
#include <linux/list.h>
#include <linux/threads.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <net/arp.h>
#include <net/neighbour.h>
#include <net/route.h>
#include <net/ip_fib.h>
#include <net/tcp.h>

#include "nes.h"

u32 cm_packets_sent;
u32 cm_packets_bounced;
u32 cm_packets_dropped;
u32 cm_packets_retrans;
u32 cm_packets_created;
u32 cm_packets_received;
atomic_t cm_listens_created;
atomic_t cm_listens_destroyed;
u32 cm_backlog_drops;
atomic_t cm_loopbacks;
atomic_t cm_nodes_created;
atomic_t cm_nodes_destroyed;
atomic_t cm_accel_dropped_pkts;
atomic_t cm_resets_recvd;

static inline int mini_cm_accelerated(struct nes_cm_core *, struct nes_cm_node *);
static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *, struct nes_vnic *, struct nes_cm_info *);
static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *, struct nes_vnic *, u16, void *, struct nes_cm_info *);
static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
static int mini_cm_accept(struct nes_cm_core *, struct nes_cm_node *);
static int mini_cm_reject(struct nes_cm_core *, struct nes_cm_node *);
static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *, struct sk_buff *);
static int mini_cm_dealloc_core(struct nes_cm_core *);
static int mini_cm_get(struct nes_cm_core *);
static int mini_cm_set(struct nes_cm_core *, u32, u32);

static void form_cm_frame(struct sk_buff *, struct nes_cm_node *, void *, u32, void *, u32, u8);
static int add_ref_cm_node(struct nes_cm_node *);
static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);

static int nes_cm_disconn_true(struct nes_qp *);
static int nes_cm_post_event(struct nes_cm_event *event);
static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
static void nes_disconnect_worker(struct work_struct *work);

static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
static int send_mpa_reject(struct nes_cm_node *);
static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
static int send_reset(struct nes_cm_node *, struct sk_buff *);
static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
static void process_packet(struct nes_cm_node *, struct sk_buff *, struct nes_cm_core *);

static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
static void cleanup_retrans_entry(struct nes_cm_node *);
static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
static void free_retrans_entry(struct nes_cm_node *cm_node);
static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph, struct sk_buff *skb, int optionsize, int passive);

/* CM event handler functions */
static void cm_event_connected(struct nes_cm_event *);
static void cm_event_connect_error(struct nes_cm_event *);
static void cm_event_reset(struct nes_cm_event *);
static void cm_event_mpa_req(struct nes_cm_event *);
static void cm_event_mpa_reject(struct nes_cm_event *);
static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);

/* MPA build functions */
static int cm_build_mpa_frame(struct nes_cm_node *, u8 **, u16 *, u8 *, u8);
static void build_mpa_v2(struct nes_cm_node *, void *, u8);
static void build_mpa_v1(struct nes_cm_node *, void *, u8);
static void build_rdma0_msg(struct nes_cm_node *, struct nes_qp **);

static void print_core(struct nes_cm_core *core);

/* External CM API Interface */
/* instance of function pointers for client API */
/* set address of this instance to cm_core->cm_ops at cm_core alloc */
static struct nes_cm_ops nes_cm_api = {
    mini_cm_accelerated,
    mini_cm_listen,
    mini_cm_del_listen,
    mini_cm_connect,
    mini_cm_close,
    mini_cm_accept,
    mini_cm_reject,
    mini_cm_recv_pkt,
    mini_cm_dealloc_core,
    mini_cm_get,
    mini_cm_set
};

static struct nes_cm_core *g_cm_core;

atomic_t cm_connects;
atomic_t cm_accepts;
atomic_t cm_disconnects;
atomic_t cm_closes;
atomic_t cm_connecteds;
atomic_t cm_connect_reqs;
atomic_t cm_rejects;

int nes_add_ref_cm_node(struct nes_cm_node *cm_node)
{
    return add_ref_cm_node(cm_node);
}

int nes_rem_ref_cm_node(struct nes_cm_node *cm_node)
{
    return rem_ref_cm_node(cm_node->cm_core, cm_node);
}

static struct nes_cm_event *create_event(struct nes_cm_node *   cm_node,
                     enum nes_cm_event_type type)
{
    struct nes_cm_event *event;

    if (!cm_node->cm_id)
        return NULL;

    /* allocate an empty event */
    event = kzalloc(sizeof(*event), GFP_ATOMIC);

    if (!event)
        return NULL;

    event->type = type;
    event->cm_node = cm_node;
    event->cm_info.rem_addr = cm_node->rem_addr;
    event->cm_info.loc_addr = cm_node->loc_addr;
    event->cm_info.rem_port = cm_node->rem_port;
    event->cm_info.loc_port = cm_node->loc_port;
    event->cm_info.cm_id = cm_node->cm_id;

    nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
          "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
          cm_node, event, type, event->cm_info.loc_addr,
          event->cm_info.loc_port, event->cm_info.rem_addr,
          event->cm_info.rem_port);

    nes_cm_post_event(event);
    return event;
}


static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
{
    u8 start_addr = 0;
    u8 *start_ptr = &start_addr;
    u8 **start_buff = &start_ptr;
    u16 buff_len = 0;

    if (!skb) {
        nes_debug(NES_DBG_CM, "skb set to NULL\n");
        return -1;
    }

    /* send an MPA Request frame */
    cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REQUEST);
    form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK);

    return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
}



static int send_mpa_reject(struct nes_cm_node *cm_node)
{
    struct sk_buff *skb = NULL;
    u8 start_addr = 0;
    u8 *start_ptr = &start_addr;
    u8 **start_buff = &start_ptr;
    u16 buff_len = 0;
    struct ietf_mpa_v1 *mpa_frame;

    skb = dev_alloc_skb(MAX_CM_BUFFER);
    if (!skb) {
        nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
        return -ENOMEM;
    }

    /* send an MPA reject frame */
    cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REPLY);
    mpa_frame = (struct ietf_mpa_v1 *)*start_buff;
    mpa_frame->flags |= IETF_MPA_FLAGS_REJECT;
    form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK | SET_FIN);

    cm_node->state = NES_CM_STATE_FIN_WAIT1;
    return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
}


static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
             u32 len)
{
    struct ietf_mpa_v1 *mpa_frame;
    struct ietf_mpa_v2 *mpa_v2_frame;
    struct ietf_rtr_msg *rtr_msg;
    int mpa_hdr_len;
    int priv_data_len;

    *type = NES_MPA_REQUEST_ACCEPT;

    /* assume req frame is in tcp data payload */
    if (len < sizeof(struct ietf_mpa_v1)) {
        nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
        return -EINVAL;
    }

    /* points to the beginning of the frame, which could be MPA V1 or V2 */
    mpa_frame = (struct ietf_mpa_v1 *)buffer;
    mpa_hdr_len = sizeof(struct ietf_mpa_v1);
    priv_data_len = ntohs(mpa_frame->priv_data_len);

    /* make sure mpa private data len is less than 512 bytes */
    if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
        nes_debug(NES_DBG_CM, "The received Length of Private"
              " Data field exceeds 512 octets\n");
        return -EINVAL;
    }
    /*
     * make sure MPA receiver interoperate with the
     * received MPA version and MPA key information
     *
     */
    if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
        nes_debug(NES_DBG_CM, "The received mpa version"
              " is not supported\n");
        return -EINVAL;
    }
    /*
    * backwards compatibility only
    */
    if (mpa_frame->rev > cm_node->mpa_frame_rev) {
        nes_debug(NES_DBG_CM, "The received mpa version"
            " can not be interoperated\n");
        return -EINVAL;
    } else {
        cm_node->mpa_frame_rev = mpa_frame->rev;
    }

    if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
        if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
            nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
            return -EINVAL;
        }
    } else {
        if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
            nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
            return -EINVAL;
        }
    }


    if (priv_data_len + mpa_hdr_len != len) {
        nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
            " complete (%x + %x != %x)\n",
            priv_data_len, mpa_hdr_len, len);
        return -EINVAL;
    }
    /* make sure it does not exceed the max size */
    if (len > MAX_CM_BUFFER) {
        nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
            " (%x + %x != %x)\n",
            priv_data_len, mpa_hdr_len, len);
        return -EINVAL;
    }

    cm_node->mpa_frame_size = priv_data_len;

    switch (mpa_frame->rev) {
    case IETF_MPA_V2: {
        u16 ird_size;
        u16 ord_size;
        u16 rtr_ctrl_ird;
        u16 rtr_ctrl_ord;

        mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
        mpa_hdr_len += IETF_RTR_MSG_SIZE;
        cm_node->mpa_frame_size -= IETF_RTR_MSG_SIZE;
        rtr_msg = &mpa_v2_frame->rtr_msg;

        /* parse rtr message */
        rtr_ctrl_ird = ntohs(rtr_msg->ctrl_ird);
        rtr_ctrl_ord = ntohs(rtr_msg->ctrl_ord);
        ird_size = rtr_ctrl_ird & IETF_NO_IRD_ORD;
        ord_size = rtr_ctrl_ord & IETF_NO_IRD_ORD;

        if (!(rtr_ctrl_ird & IETF_PEER_TO_PEER)) {
            /* send reset */
            return -EINVAL;
        }

        if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
            /* responder */
            if (cm_node->ord_size > ird_size)
                cm_node->ord_size = ird_size;
        } else {
            /* initiator */
            if (cm_node->ord_size > ird_size)
                cm_node->ord_size = ird_size;

            if (cm_node->ird_size < ord_size) {
                /* no resources available */
                /* send terminate message */
                return -EINVAL;
            }
        }

        if (rtr_ctrl_ord & IETF_RDMA0_READ) {
            cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
        } else if (rtr_ctrl_ord & IETF_RDMA0_WRITE) {
            cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
        } else {        /* Not supported RDMA0 operation */
            return -EINVAL;
        }
        break;
    }
    case IETF_MPA_V1:
    default:
        break;
    }

    /* copy entire MPA frame to our cm_node's frame */
    memcpy(cm_node->mpa_frame_buf, buffer + mpa_hdr_len, cm_node->mpa_frame_size);

    if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
        *type = NES_MPA_REQUEST_REJECT;
    return 0;
}


static void form_cm_frame(struct sk_buff *skb,
              struct nes_cm_node *cm_node, void *options, u32 optionsize,
              void *data, u32 datasize, u8 flags)
{
    struct tcphdr *tcph;
    struct iphdr *iph;
    struct ethhdr *ethh;
    u8 *buf;
    u16 packetsize = sizeof(*iph);

    packetsize += sizeof(*tcph);
    packetsize += optionsize + datasize;

    skb_trim(skb, 0);
    memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));

    buf = skb_put(skb, packetsize + ETH_HLEN);

    ethh = (struct ethhdr *)buf;
    buf += ETH_HLEN;

    iph = (struct iphdr *)buf;
    buf += sizeof(*iph);
    tcph = (struct tcphdr *)buf;
    skb_reset_mac_header(skb);
    skb_set_network_header(skb, ETH_HLEN);
    skb_set_transport_header(skb, ETH_HLEN + sizeof(*iph));
    buf += sizeof(*tcph);

    skb->ip_summed = CHECKSUM_PARTIAL;
    if (!(cm_node->netdev->features & NETIF_F_IP_CSUM))
        skb->ip_summed = CHECKSUM_NONE;
    skb->protocol = htons(0x800);
    skb->data_len = 0;
    skb->mac_len = ETH_HLEN;

    memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
    memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
    ethh->h_proto = htons(0x0800);

    iph->version = IPVERSION;
    iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
    iph->tos = 0;
    iph->tot_len = htons(packetsize);
    iph->id = htons(++cm_node->tcp_cntxt.loc_id);

    iph->frag_off = htons(0x4000);
    iph->ttl = 0x40;
    iph->protocol = 0x06;   /* IPPROTO_TCP */

    iph->saddr = htonl(cm_node->loc_addr);
    iph->daddr = htonl(cm_node->rem_addr);

    tcph->source = htons(cm_node->loc_port);
    tcph->dest = htons(cm_node->rem_port);
    tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);

    if (flags & SET_ACK) {
        cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
        tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
        tcph->ack = 1;
    } else {
        tcph->ack_seq = 0;
    }

    if (flags & SET_SYN) {
        cm_node->tcp_cntxt.loc_seq_num++;
        tcph->syn = 1;
    } else {
        cm_node->tcp_cntxt.loc_seq_num += datasize;
    }

    if (flags & SET_FIN) {
        cm_node->tcp_cntxt.loc_seq_num++;
        tcph->fin = 1;
    }

    if (flags & SET_RST)
        tcph->rst = 1;

    tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
    tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
    tcph->urg_ptr = 0;
    if (optionsize)
        memcpy(buf, options, optionsize);
    buf += optionsize;
    if (datasize)
        memcpy(buf, data, datasize);

    skb_shinfo(skb)->nr_frags = 0;
    cm_packets_created++;
}

static void print_core(struct nes_cm_core *core)
{
    nes_debug(NES_DBG_CM, "---------------------------------------------\n");
    nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
    if (!core)
        return;
    nes_debug(NES_DBG_CM, "---------------------------------------------\n");

    nes_debug(NES_DBG_CM, "State         : %u \n", core->state);

    nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
    nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));

    nes_debug(NES_DBG_CM, "core          : %p \n", core);

    nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
}

static int cm_build_mpa_frame(struct nes_cm_node *cm_node, u8 **start_buff,
                  u16 *buff_len, u8 *pci_mem, u8 mpa_key)
{
    int ret = 0;

    *start_buff = (pci_mem) ? pci_mem : &cm_node->mpa_frame_buf[0];

    switch (cm_node->mpa_frame_rev) {
    case IETF_MPA_V1:
        *start_buff = (u8 *)*start_buff + sizeof(struct ietf_rtr_msg);
        *buff_len = sizeof(struct ietf_mpa_v1) + cm_node->mpa_frame_size;
        build_mpa_v1(cm_node, *start_buff, mpa_key);
        break;
    case IETF_MPA_V2:
        *buff_len = sizeof(struct ietf_mpa_v2) + cm_node->mpa_frame_size;
        build_mpa_v2(cm_node, *start_buff, mpa_key);
        break;
    default:
        ret = -EINVAL;
    }
    return ret;
}

static void build_mpa_v2(struct nes_cm_node *cm_node,
             void *start_addr, u8 mpa_key)
{
    struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
    struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
    u16 ctrl_ird;
    u16 ctrl_ord;

    /* initialize the upper 5 bytes of the frame */
    build_mpa_v1(cm_node, start_addr, mpa_key);
    mpa_frame->flags |= IETF_MPA_V2_FLAG; /* set a bit to indicate MPA V2 */
    mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);

    /* initialize RTR msg */
    ctrl_ird = (cm_node->ird_size > IETF_NO_IRD_ORD) ?
                IETF_NO_IRD_ORD : cm_node->ird_size;
    ctrl_ord = (cm_node->ord_size > IETF_NO_IRD_ORD) ?
                IETF_NO_IRD_ORD : cm_node->ord_size;

    ctrl_ird |= IETF_PEER_TO_PEER;
    ctrl_ird |= IETF_FLPDU_ZERO_LEN;

    switch (mpa_key) {
    case MPA_KEY_REQUEST:
        ctrl_ord |= IETF_RDMA0_WRITE;
        ctrl_ord |= IETF_RDMA0_READ;
        break;
    case MPA_KEY_REPLY:
        switch (cm_node->send_rdma0_op) {
        case SEND_RDMA_WRITE_ZERO:
            ctrl_ord |= IETF_RDMA0_WRITE;
            break;
        case SEND_RDMA_READ_ZERO:
            ctrl_ord |= IETF_RDMA0_READ;
            break;
        }
    }
    rtr_msg->ctrl_ird = htons(ctrl_ird);
    rtr_msg->ctrl_ord = htons(ctrl_ord);
}

static void build_mpa_v1(struct nes_cm_node *cm_node, void *start_addr, u8 mpa_key)
{
    struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;

    switch (mpa_key) {
    case MPA_KEY_REQUEST:
        memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
        break;
    case MPA_KEY_REPLY:
        memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
        break;
    }
    mpa_frame->flags = IETF_MPA_FLAGS_CRC;
    mpa_frame->rev = cm_node->mpa_frame_rev;
    mpa_frame->priv_data_len = htons(cm_node->mpa_frame_size);
}

static void build_rdma0_msg(struct nes_cm_node *cm_node, struct nes_qp **nesqp_addr)
{
    u64 u64temp;
    struct nes_qp *nesqp = *nesqp_addr;
    struct nes_hw_qp_wqe *wqe = &nesqp->hwqp.sq_vbase[0];

    u64temp = (unsigned long)nesqp;
    u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
    set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);

    wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
    wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;

    switch (cm_node->send_rdma0_op) {
    case SEND_RDMA_WRITE_ZERO:
        nes_debug(NES_DBG_CM, "Sending first write.\n");
        wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
            cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
        wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
        wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
        wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
        break;

    case SEND_RDMA_READ_ZERO:
    default:
        if (cm_node->send_rdma0_op != SEND_RDMA_READ_ZERO) {
            printk(KERN_ERR "%s[%u]: Unsupported RDMA0 len operation=%u\n",
                 __func__, __LINE__, cm_node->send_rdma0_op);
            WARN_ON(1);
        }
        nes_debug(NES_DBG_CM, "Sending first rdma operation.\n");
        wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
            cpu_to_le32(NES_IWARP_SQ_OP_RDMAR);
        wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_LOW_IDX] = 1;
        wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_HIGH_IDX] = 0;
        wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_LENGTH_IDX] = 0;
        wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_STAG_IDX] = 1;
        wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 1;
        break;
    }

    if (nesqp->sq_kmapped) {
        nesqp->sq_kmapped = 0;
        kunmap(nesqp->page);
    }

    /*use the reserved spot on the WQ for the extra first WQE*/
    nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
                                 NES_QPCONTEXT_ORDIRD_WRPDU |
                                 NES_QPCONTEXT_ORDIRD_ALSMM));
    nesqp->skip_lsmm = 1;
    nesqp->hwqp.sq_tail = 0;
}

int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
               enum nes_timer_type type, int send_retrans,
               int close_when_complete)
{
    unsigned long flags;
    struct nes_cm_core *cm_core = cm_node->cm_core;
    struct nes_timer_entry *new_send;
    int ret = 0;
    u32 was_timer_set;

    new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
    if (!new_send)
        return -ENOMEM;

    /* new_send->timetosend = currenttime */
    new_send->retrycount = NES_DEFAULT_RETRYS;
    new_send->retranscount = NES_DEFAULT_RETRANS;
    new_send->skb = skb;
    new_send->timetosend = jiffies;
    new_send->type = type;
    new_send->netdev = cm_node->netdev;
    new_send->send_retrans = send_retrans;
    new_send->close_when_complete = close_when_complete;

    if (type == NES_TIMER_TYPE_CLOSE) {
        new_send->timetosend += (HZ / 10);
        if (cm_node->recv_entry) {
            kfree(new_send);
            WARN_ON(1);
            return -EINVAL;
        }
        cm_node->recv_entry = new_send;
    }

    if (type == NES_TIMER_TYPE_SEND) {
        new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
        atomic_inc(&new_send->skb->users);
        spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
        cm_node->send_entry = new_send;
        add_ref_cm_node(cm_node);
        spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
        new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;

        ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
        if (ret != NETDEV_TX_OK) {
            nes_debug(NES_DBG_CM, "Error sending packet %p "
                  "(jiffies = %lu)\n", new_send, jiffies);
            new_send->timetosend = jiffies;
            ret = NETDEV_TX_OK;
        } else {
            cm_packets_sent++;
            if (!send_retrans) {
                cleanup_retrans_entry(cm_node);
                if (close_when_complete)
                    rem_ref_cm_node(cm_core, cm_node);
                return ret;
            }
        }
    }

    was_timer_set = timer_pending(&cm_core->tcp_timer);

    if (!was_timer_set) {
        cm_core->tcp_timer.expires = new_send->timetosend;
        add_timer(&cm_core->tcp_timer);
    }

    return ret;
}

static void nes_retrans_expired(struct nes_cm_node *cm_node)
{
    struct iw_cm_id *cm_id = cm_node->cm_id;
    enum nes_cm_node_state state = cm_node->state;
    cm_node->state = NES_CM_STATE_CLOSED;

    switch (state) {
    case NES_CM_STATE_SYN_RCVD:
    case NES_CM_STATE_CLOSING:
        rem_ref_cm_node(cm_node->cm_core, cm_node);
        break;
    case NES_CM_STATE_LAST_ACK:
    case NES_CM_STATE_FIN_WAIT1:
        if (cm_node->cm_id)
            cm_id->rem_ref(cm_id);
        send_reset(cm_node, NULL);
        break;
    default:
        add_ref_cm_node(cm_node);
        send_reset(cm_node, NULL);
        create_event(cm_node, NES_CM_EVENT_ABORTED);
    }
}

static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
{
    struct nes_timer_entry *recv_entry = cm_node->recv_entry;
    struct iw_cm_id *cm_id = cm_node->cm_id;
    struct nes_qp *nesqp;
    unsigned long qplockflags;

    if (!recv_entry)
        return;
    nesqp = (struct nes_qp *)recv_entry->skb;
    if (nesqp) {
        spin_lock_irqsave(&nesqp->lock, qplockflags);
        if (nesqp->cm_id) {
            nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
                  "refcount = %d: HIT A "
                  "NES_TIMER_TYPE_CLOSE with something "
                  "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
                  atomic_read(&nesqp->refcount));
            nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
            nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
            nesqp->ibqp_state = IB_QPS_ERR;
            spin_unlock_irqrestore(&nesqp->lock, qplockflags);
            nes_cm_disconn(nesqp);
        } else {
            spin_unlock_irqrestore(&nesqp->lock, qplockflags);
            nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
                  "refcount = %d: HIT A "
                  "NES_TIMER_TYPE_CLOSE with nothing "
                  "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
                  atomic_read(&nesqp->refcount));
        }
    } else if (rem_node) {
        /* TIME_WAIT state */
        rem_ref_cm_node(cm_node->cm_core, cm_node);
    }
    if (cm_node->cm_id)
        cm_id->rem_ref(cm_id);
    kfree(recv_entry);
    cm_node->recv_entry = NULL;
}

static void nes_cm_timer_tick(unsigned long pass)
{
    unsigned long flags;
    unsigned long nexttimeout = jiffies + NES_LONG_TIME;
    struct nes_cm_node *cm_node;
    struct nes_timer_entry *send_entry, *recv_entry;
    struct list_head *list_core_temp;
    struct list_head *list_node;
    struct nes_cm_core *cm_core = g_cm_core;
    u32 settimer = 0;
    unsigned long timetosend;
    int ret = NETDEV_TX_OK;

    struct list_head timer_list;

    INIT_LIST_HEAD(&timer_list);
    spin_lock_irqsave(&cm_core->ht_lock, flags);

    list_for_each_safe(list_node, list_core_temp,
               &cm_core->connected_nodes) {
        cm_node = container_of(list_node, struct nes_cm_node, list);
        if ((cm_node->recv_entry) || (cm_node->send_entry)) {
            add_ref_cm_node(cm_node);
            list_add(&cm_node->timer_entry, &timer_list);
        }
    }
    spin_unlock_irqrestore(&cm_core->ht_lock, flags);

    list_for_each_safe(list_node, list_core_temp, &timer_list) {
        cm_node = container_of(list_node, struct nes_cm_node,
                       timer_entry);
        recv_entry = cm_node->recv_entry;

        if (recv_entry) {
            if (time_after(recv_entry->timetosend, jiffies)) {
                if (nexttimeout > recv_entry->timetosend ||
                    !settimer) {
                    nexttimeout = recv_entry->timetosend;
                    settimer = 1;
                }
            } else {
                handle_recv_entry(cm_node, 1);
            }
        }

        spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
        do {
            send_entry = cm_node->send_entry;
            if (!send_entry)
                break;
            if (time_after(send_entry->timetosend, jiffies)) {
                if (cm_node->state != NES_CM_STATE_TSA) {
                    if ((nexttimeout >
                         send_entry->timetosend) ||
                        !settimer) {
                        nexttimeout =
                            send_entry->timetosend;
                        settimer = 1;
                    }
                } else {
                    free_retrans_entry(cm_node);
                }
                break;
            }

            if ((cm_node->state == NES_CM_STATE_TSA) ||
                (cm_node->state == NES_CM_STATE_CLOSED)) {
                free_retrans_entry(cm_node);
                break;
            }

            if (!send_entry->retranscount ||
                !send_entry->retrycount) {
                cm_packets_dropped++;
                free_retrans_entry(cm_node);

                spin_unlock_irqrestore(
                    &cm_node->retrans_list_lock, flags);
                nes_retrans_expired(cm_node);
                cm_node->state = NES_CM_STATE_CLOSED;
                spin_lock_irqsave(&cm_node->retrans_list_lock,
                          flags);
                break;
            }
            atomic_inc(&send_entry->skb->users);
            cm_packets_retrans++;
            nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
                  "for node %p, jiffies = %lu, time to send = "
                  "%lu, retranscount = %u, send_entry->seq_num = "
                  "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
                  "0x%08X\n", send_entry, cm_node, jiffies,
                  send_entry->timetosend,
                  send_entry->retranscount,
                  send_entry->seq_num,
                  cm_node->tcp_cntxt.rem_ack_num);

            spin_unlock_irqrestore(&cm_node->retrans_list_lock,
                           flags);
            ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
            spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
            if (ret != NETDEV_TX_OK) {
                nes_debug(NES_DBG_CM, "rexmit failed for "
                      "node=%p\n", cm_node);
                cm_packets_bounced++;
                send_entry->retrycount--;
                nexttimeout = jiffies + NES_SHORT_TIME;
                settimer = 1;
                break;
            } else {
                cm_packets_sent++;
            }
            nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
                  "%u, retry count = %u.\n",
                  send_entry->retranscount,
                  send_entry->retrycount);
            if (send_entry->send_retrans) {
                send_entry->retranscount--;
                timetosend = (NES_RETRY_TIMEOUT <<
                          (NES_DEFAULT_RETRANS - send_entry->retranscount));

                send_entry->timetosend = jiffies +
                             min(timetosend, NES_MAX_TIMEOUT);
                if (nexttimeout > send_entry->timetosend ||
                    !settimer) {
                    nexttimeout = send_entry->timetosend;
                    settimer = 1;
                }
            } else {
                int close_when_complete;
                close_when_complete =
                    send_entry->close_when_complete;
                nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
                      cm_node, cm_node->state);
                free_retrans_entry(cm_node);
                if (close_when_complete)
                    rem_ref_cm_node(cm_node->cm_core,
                            cm_node);
            }
        } while (0);

        spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
        rem_ref_cm_node(cm_node->cm_core, cm_node);
    }

    if (settimer) {
        if (!timer_pending(&cm_core->tcp_timer)) {
            cm_core->tcp_timer.expires = nexttimeout;
            add_timer(&cm_core->tcp_timer);
        }
    }
}


static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
            struct sk_buff *skb)
{
    int ret;
    int flags = SET_SYN;
    char optionsbuffer[sizeof(struct option_mss) +
               sizeof(struct option_windowscale) + sizeof(struct option_base) +
               TCP_OPTIONS_PADDING];

    int optionssize = 0;
    /* Sending MSS option */
    union all_known_options *options;

    if (!cm_node)
        return -EINVAL;

    options = (union all_known_options *)&optionsbuffer[optionssize];
    options->as_mss.optionnum = OPTION_NUMBER_MSS;
    options->as_mss.length = sizeof(struct option_mss);
    options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
    optionssize += sizeof(struct option_mss);

    options = (union all_known_options *)&optionsbuffer[optionssize];
    options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
    options->as_windowscale.length = sizeof(struct option_windowscale);
    options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
    optionssize += sizeof(struct option_windowscale);

    if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
        options = (union all_known_options *)&optionsbuffer[optionssize];
        options->as_base.optionnum = OPTION_NUMBER_WRITE0;
        options->as_base.length = sizeof(struct option_base);
        optionssize += sizeof(struct option_base);
        /* we need the size to be a multiple of 4 */
        options = (union all_known_options *)&optionsbuffer[optionssize];
        options->as_end = 1;
        optionssize += 1;
        options = (union all_known_options *)&optionsbuffer[optionssize];
        options->as_end = 1;
        optionssize += 1;
    }

    options = (union all_known_options *)&optionsbuffer[optionssize];
    options->as_end = OPTION_NUMBER_END;
    optionssize += 1;

    if (!skb)
        skb = dev_alloc_skb(MAX_CM_BUFFER);
    if (!skb) {
        nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
        return -1;
    }

    if (sendack)
        flags |= SET_ACK;

    form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
    ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);

    return ret;
}


static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
{
    int ret;
    int flags = SET_RST | SET_ACK;

    if (!skb)
        skb = dev_alloc_skb(MAX_CM_BUFFER);
    if (!skb) {
        nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
        return -ENOMEM;
    }

    form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
    ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);

    return ret;
}


static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
{
    int ret;

    if (!skb)
        skb = dev_alloc_skb(MAX_CM_BUFFER);

    if (!skb) {
        nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
        return -1;
    }

    form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
    ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);

    return ret;
}


static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
{
    int ret;

    /* if we didn't get a frame get one */
    if (!skb)
        skb = dev_alloc_skb(MAX_CM_BUFFER);

    if (!skb) {
        nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
        return -1;
    }

    form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
    ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);

    return ret;
}


static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
                     u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
{
    unsigned long flags;
    struct list_head *hte;
    struct nes_cm_node *cm_node;

    /* get a handle on the hte */
    hte = &cm_core->connected_nodes;

    /* walk list and find cm_node associated with this session ID */
    spin_lock_irqsave(&cm_core->ht_lock, flags);
    list_for_each_entry(cm_node, hte, list) {
        /* compare quad, return node handle if a match */
        nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
              cm_node->loc_addr, cm_node->loc_port,
              loc_addr, loc_port,
              cm_node->rem_addr, cm_node->rem_port,
              rem_addr, rem_port);
        if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
            (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
            add_ref_cm_node(cm_node);
            spin_unlock_irqrestore(&cm_core->ht_lock, flags);
            return cm_node;
        }
    }
    spin_unlock_irqrestore(&cm_core->ht_lock, flags);

    /* no owner node */
    return NULL;
}


static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
                         nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
{
    unsigned long flags;
    struct nes_cm_listener *listen_node;

    /* walk list and find cm_node associated with this session ID */
    spin_lock_irqsave(&cm_core->listen_list_lock, flags);
    list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
        /* compare node pair, return node handle if a match */
        if (((listen_node->loc_addr == dst_addr) ||
             listen_node->loc_addr == 0x00000000) &&
            (listen_node->loc_port == dst_port) &&
            (listener_state & listen_node->listener_state)) {
            atomic_inc(&listen_node->ref_count);
            spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
            return listen_node;
        }
    }
    spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);

    /* no listener */
    return NULL;
}


static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
{
    unsigned long flags;
    struct list_head *hte;

    if (!cm_node || !cm_core)
        return -EINVAL;

    nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
          cm_node);

    spin_lock_irqsave(&cm_core->ht_lock, flags);

    /* get a handle on the hash table element (list head for this slot) */
    hte = &cm_core->connected_nodes;
    list_add_tail(&cm_node->list, hte);
    atomic_inc(&cm_core->ht_node_cnt);

    spin_unlock_irqrestore(&cm_core->ht_lock, flags);

    return 0;
}


static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
                     struct nes_cm_listener *listener, int free_hanging_nodes)
{
    int ret = -EINVAL;
    int err = 0;
    unsigned long flags;
    struct list_head *list_pos = NULL;
    struct list_head *list_temp = NULL;
    struct nes_cm_node *cm_node = NULL;
    struct list_head reset_list;

    nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
          "refcnt=%d\n", listener, free_hanging_nodes,
          atomic_read(&listener->ref_count));
    /* free non-accelerated child nodes for this listener */
    INIT_LIST_HEAD(&reset_list);
    if (free_hanging_nodes) {
        spin_lock_irqsave(&cm_core->ht_lock, flags);
        list_for_each_safe(list_pos, list_temp,
                   &g_cm_core->connected_nodes) {
            cm_node = container_of(list_pos, struct nes_cm_node,
                           list);
            if ((cm_node->listener == listener) &&
                (!cm_node->accelerated)) {
                add_ref_cm_node(cm_node);
                list_add(&cm_node->reset_entry, &reset_list);
            }
        }
        spin_unlock_irqrestore(&cm_core->ht_lock, flags);
    }

    list_for_each_safe(list_pos, list_temp, &reset_list) {
        cm_node = container_of(list_pos, struct nes_cm_node,
                       reset_entry);
        {
            struct nes_cm_node *loopback = cm_node->loopbackpartner;
            enum nes_cm_node_state old_state;
            if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
                rem_ref_cm_node(cm_node->cm_core, cm_node);
            } else {
                if (!loopback) {
                    cleanup_retrans_entry(cm_node);
                    err = send_reset(cm_node, NULL);
                    if (err) {
                        cm_node->state =
                            NES_CM_STATE_CLOSED;
                        WARN_ON(1);
                    } else {
                        old_state = cm_node->state;
                        cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
                        if (old_state != NES_CM_STATE_MPAREQ_RCVD)
                            rem_ref_cm_node(
                                cm_node->cm_core,
                                cm_node);
                    }
                } else {
                    struct nes_cm_event event;

                    event.cm_node = loopback;
                    event.cm_info.rem_addr =
                            loopback->rem_addr;
                    event.cm_info.loc_addr =
                            loopback->loc_addr;
                    event.cm_info.rem_port =
                            loopback->rem_port;
                    event.cm_info.loc_port =
                             loopback->loc_port;
                    event.cm_info.cm_id = loopback->cm_id;
                    add_ref_cm_node(loopback);
                    loopback->state = NES_CM_STATE_CLOSED;
                    cm_event_connect_error(&event);
                    cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;

                    rem_ref_cm_node(cm_node->cm_core,
                             cm_node);

                }
            }
        }
    }

    spin_lock_irqsave(&cm_core->listen_list_lock, flags);
    if (!atomic_dec_return(&listener->ref_count)) {
        list_del(&listener->list);

        /* decrement our listen node count */
        atomic_dec(&cm_core->listen_node_cnt);

        spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);

        if (listener->nesvnic)
            nes_manage_apbvt(listener->nesvnic, listener->loc_port,
                     PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);

        nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);

        kfree(listener);
        listener = NULL;
        ret = 0;
        atomic_inc(&cm_listens_destroyed);
    } else {
        spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
    }
    if (listener) {
        if (atomic_read(&listener->pend_accepts_cnt) > 0)
            nes_debug(NES_DBG_CM, "destroying listener (%p)"
                  " with non-zero pending accepts=%u\n",
                  listener, atomic_read(&listener->pend_accepts_cnt));
    }

    return ret;
}


static int mini_cm_del_listen(struct nes_cm_core *cm_core,
                  struct nes_cm_listener *listener)
{
    listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
    listener->cm_id = NULL; /* going to be destroyed pretty soon */
    return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
}


static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
                      struct nes_cm_node *cm_node)
{
    u32 was_timer_set;

    cm_node->accelerated = 1;

    if (cm_node->accept_pend) {
        BUG_ON(!cm_node->listener);
        atomic_dec(&cm_node->listener->pend_accepts_cnt);
        cm_node->accept_pend = 0;
        BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
    }

    was_timer_set = timer_pending(&cm_core->tcp_timer);
    if (!was_timer_set) {
        cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
        add_timer(&cm_core->tcp_timer);
    }

    return 0;
}


static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
{
    struct rtable *rt;
    struct neighbour *neigh;
    int rc = arpindex;
    struct net_device *netdev;
    struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;

    rt = ip_route_output(&init_net, htonl(dst_ip), 0, 0, 0);
    if (IS_ERR(rt)) {
        printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
               __func__, dst_ip);
        return rc;
    }

    if (netif_is_bond_slave(nesvnic->netdev))
        netdev = nesvnic->netdev->master;
    else
        netdev = nesvnic->netdev;

    neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, netdev);

    rcu_read_lock();
    if (neigh) {
        if (neigh->nud_state & NUD_VALID) {
            nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
                  " is %pM, Gateway is 0x%08X \n", dst_ip,
                  neigh->ha, ntohl(rt->rt_gateway));

            if (arpindex >= 0) {
                if (!memcmp(nesadapter->arp_table[arpindex].mac_addr,
                        neigh->ha, ETH_ALEN)) {
                    /* Mac address same as in nes_arp_table */
                    goto out;
                }

                nes_manage_arp_cache(nesvnic->netdev,
                             nesadapter->arp_table[arpindex].mac_addr,
                             dst_ip, NES_ARP_DELETE);
            }

            nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
                         dst_ip, NES_ARP_ADD);
            rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
                       NES_ARP_RESOLVE);
        } else {
            neigh_event_send(neigh, NULL);
        }
    }
out:
    rcu_read_unlock();

    if (neigh)
        neigh_release(neigh);

    ip_rt_put(rt);
    return rc;
}

static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
                    struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
                    struct nes_cm_listener *listener)
{
    struct nes_cm_node *cm_node;
    struct timespec ts;
    int oldarpindex = 0;
    int arpindex = 0;
    struct nes_device *nesdev;
    struct nes_adapter *nesadapter;

    /* create an hte and cm_node for this instance */
    cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
    if (!cm_node)
        return NULL;

    /* set our node specific transport info */
    cm_node->loc_addr = cm_info->loc_addr;
    cm_node->rem_addr = cm_info->rem_addr;
    cm_node->loc_port = cm_info->loc_port;
    cm_node->rem_port = cm_info->rem_port;

    cm_node->mpa_frame_rev = mpa_version;
    cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
    cm_node->ird_size = IETF_NO_IRD_ORD;
    cm_node->ord_size = IETF_NO_IRD_ORD;

    nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
          &cm_node->loc_addr, cm_node->loc_port,
          &cm_node->rem_addr, cm_node->rem_port);
    cm_node->listener = listener;
    cm_node->netdev = nesvnic->netdev;
    cm_node->cm_id = cm_info->cm_id;
    memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);

    nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
          cm_node->cm_id);

    spin_lock_init(&cm_node->retrans_list_lock);

    cm_node->loopbackpartner = NULL;
    atomic_set(&cm_node->ref_count, 1);
    /* associate our parent CM core */
    cm_node->cm_core = cm_core;
    cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
    cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
    cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
                     NES_CM_DEFAULT_RCV_WND_SCALE;
    ts = current_kernel_time();
    cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
    cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
                 sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
    cm_node->tcp_cntxt.rcv_nxt = 0;
    /* get a unique session ID , add thread_id to an upcounter to handle race */
    atomic_inc(&cm_core->node_cnt);
    cm_node->conn_type = cm_info->conn_type;
    cm_node->apbvt_set = 0;
    cm_node->accept_pend = 0;

    cm_node->nesvnic = nesvnic;
    /* get some device handles, for arp lookup */
    nesdev = nesvnic->nesdev;
    nesadapter = nesdev->nesadapter;

    cm_node->loopbackpartner = NULL;

    /* get the mac addr for the remote node */
    oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
    arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr, oldarpindex);
    if (arpindex < 0) {
        kfree(cm_node);
        return NULL;
    }

    /* copy the mac addr to node context */
    memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
    nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
          cm_node->rem_mac);

    add_hte_node(cm_core, cm_node);
    atomic_inc(&cm_nodes_created);

    return cm_node;
}


static int add_ref_cm_node(struct nes_cm_node *cm_node)
{
    atomic_inc(&cm_node->ref_count);
    return 0;
}


static int rem_ref_cm_node(struct nes_cm_core *cm_core,
               struct nes_cm_node *cm_node)
{
    unsigned long flags;
    struct nes_qp *nesqp;

    if (!cm_node)
        return -EINVAL;

    spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
    if (atomic_dec_return(&cm_node->ref_count)) {
        spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
        return 0;
    }
    list_del(&cm_node->list);
    atomic_dec(&cm_core->ht_node_cnt);
    spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);

    /* if the node is destroyed before connection was accelerated */
    if (!cm_node->accelerated && cm_node->accept_pend) {
        BUG_ON(!cm_node->listener);
        atomic_dec(&cm_node->listener->pend_accepts_cnt);
        BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
    }
    WARN_ON(cm_node->send_entry);
    if (cm_node->recv_entry)
        handle_recv_entry(cm_node, 0);
    if (cm_node->listener) {
        mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
    } else {
        if (cm_node->apbvt_set && cm_node->nesvnic) {
            nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
                     PCI_FUNC(
                         cm_node->nesvnic->nesdev->pcidev->devfn),
                     NES_MANAGE_APBVT_DEL);
        }
    }

    atomic_dec(&cm_core->node_cnt);
    atomic_inc(&cm_nodes_destroyed);
    nesqp = cm_node->nesqp;
    if (nesqp) {
        nesqp->cm_node = NULL;
        nes_rem_ref(&nesqp->ibqp);
        cm_node->nesqp = NULL;
    }

    kfree(cm_node);
    return 0;
}

static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
               u32 optionsize, u32 syn_packet)
{
    u32 tmp;
    u32 offset = 0;
    union all_known_options *all_options;
    char got_mss_option = 0;

    while (offset < optionsize) {
        all_options = (union all_known_options *)(optionsloc + offset);
        switch (all_options->as_base.optionnum) {
        case OPTION_NUMBER_END:
            offset = optionsize;
            break;
        case OPTION_NUMBER_NONE:
            offset += 1;
            continue;
        case OPTION_NUMBER_MSS:
            nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
                  "Size: %d\n", __func__,
                  all_options->as_mss.length, offset, optionsize);
            got_mss_option = 1;
            if (all_options->as_mss.length != 4) {
                return 1;
            } else {
                tmp = ntohs(all_options->as_mss.mss);
                if (tmp > 0 && tmp <
                    cm_node->tcp_cntxt.mss)
                    cm_node->tcp_cntxt.mss = tmp;
            }
            break;
        case OPTION_NUMBER_WINDOW_SCALE:
            cm_node->tcp_cntxt.snd_wscale =
                all_options->as_windowscale.shiftcount;
            break;
        default:
            nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
                  all_options->as_base.optionnum);
            break;
        }
        offset += all_options->as_base.length;
    }
    if ((!got_mss_option) && (syn_packet))
        cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
    return 0;
}

static void drop_packet(struct sk_buff *skb)
{
    atomic_inc(&cm_accel_dropped_pkts);
    dev_kfree_skb_any(skb);
}

static void handle_fin_pkt(struct nes_cm_node *cm_node)
{
    nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
          "refcnt=%d\n", cm_node, cm_node->state,
          atomic_read(&cm_node->ref_count));
    switch (cm_node->state) {
    case NES_CM_STATE_SYN_RCVD:
    case NES_CM_STATE_SYN_SENT:
    case NES_CM_STATE_ESTABLISHED:
    case NES_CM_STATE_MPAREJ_RCVD:
        cm_node->tcp_cntxt.rcv_nxt++;
        cleanup_retrans_entry(cm_node);
        cm_node->state = NES_CM_STATE_LAST_ACK;
        send_fin(cm_node, NULL);
        break;
    case NES_CM_STATE_MPAREQ_SENT:
        create_event(cm_node, NES_CM_EVENT_ABORTED);
        cm_node->tcp_cntxt.rcv_nxt++;
        cleanup_retrans_entry(cm_node);
        cm_node->state = NES_CM_STATE_CLOSED;
        add_ref_cm_node(cm_node);
        send_reset(cm_node, NULL);
        break;
    case NES_CM_STATE_FIN_WAIT1:
        cm_node->tcp_cntxt.rcv_nxt++;
        cleanup_retrans_entry(cm_node);
        cm_node->state = NES_CM_STATE_CLOSING;
        send_ack(cm_node, NULL);
        /* Wait for ACK as this is simultaneous close..
        * After we receive ACK, do not send anything..
        * Just rm the node.. Done.. */
        break;
    case NES_CM_STATE_FIN_WAIT2:
        cm_node->tcp_cntxt.rcv_nxt++;
        cleanup_retrans_entry(cm_node);
        cm_node->state = NES_CM_STATE_TIME_WAIT;
        send_ack(cm_node, NULL);
        schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
        break;
    case NES_CM_STATE_TIME_WAIT:
        cm_node->tcp_cntxt.rcv_nxt++;
        cleanup_retrans_entry(cm_node);
        cm_node->state = NES_CM_STATE_CLOSED;
        rem_ref_cm_node(cm_node->cm_core, cm_node);
        break;
    case NES_CM_STATE_TSA:
    default:
        nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
            cm_node, cm_node->state);
        break;
    }
}


static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
    struct tcphdr *tcph)
{

    int reset = 0;  /* whether to send reset in case of err.. */
    atomic_inc(&cm_resets_recvd);
    nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
            " refcnt=%d\n", cm_node, cm_node->state,
            atomic_read(&cm_node->ref_count));
    cleanup_retrans_entry(cm_node);
    switch (cm_node->state) {
    case NES_CM_STATE_SYN_SENT:
    case NES_CM_STATE_MPAREQ_SENT:
        nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
            "listener=%p state=%d\n", __func__, __LINE__, cm_node,
            cm_node->listener, cm_node->state);
        switch (cm_node->mpa_frame_rev) {
        case IETF_MPA_V2:
            cm_node->mpa_frame_rev = IETF_MPA_V1;
            /* send a syn and goto syn sent state */
            cm_node->state = NES_CM_STATE_SYN_SENT;
            if (send_syn(cm_node, 0, NULL)) {
                active_open_err(cm_node, skb, reset);
            }
            break;
        case IETF_MPA_V1:
        default:
            active_open_err(cm_node, skb, reset);
            break;
        }
        break;
    case NES_CM_STATE_MPAREQ_RCVD:
        atomic_inc(&cm_node->passive_state);
        dev_kfree_skb_any(skb);
        break;
    case NES_CM_STATE_ESTABLISHED:
    case NES_CM_STATE_SYN_RCVD:
    case NES_CM_STATE_LISTENING:
        nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
        passive_open_err(cm_node, skb, reset);
        break;
    case NES_CM_STATE_TSA:
        active_open_err(cm_node, skb, reset);
        break;
    case NES_CM_STATE_CLOSED:
        drop_packet(skb);
        break;
    case NES_CM_STATE_FIN_WAIT2:
    case NES_CM_STATE_FIN_WAIT1:
    case NES_CM_STATE_LAST_ACK:
        cm_node->cm_id->rem_ref(cm_node->cm_id);
    case NES_CM_STATE_TIME_WAIT:
        cm_node->state = NES_CM_STATE_CLOSED;
        rem_ref_cm_node(cm_node->cm_core, cm_node);
        drop_packet(skb);
        break;
    default:
        drop_packet(skb);
        break;
    }
}


static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
{
    int ret = 0;
    int datasize = skb->len;
    u8 *dataloc = skb->data;

    enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
    u32 res_type;

    ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
    if (ret) {
        nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
        if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
            nes_debug(NES_DBG_CM, "%s[%u] create abort for "
                  "cm_node=%p listener=%p state=%d\n", __func__,
                  __LINE__, cm_node, cm_node->listener,
                  cm_node->state);
            active_open_err(cm_node, skb, 1);
        } else {
            passive_open_err(cm_node, skb, 1);
        }
        return;
    }

    switch (cm_node->state) {
    case NES_CM_STATE_ESTABLISHED:
        if (res_type == NES_MPA_REQUEST_REJECT)
            /*BIG problem as we are receiving the MPA.. So should
             * not be REJECT.. This is Passive Open.. We can
             * only receive it Reject for Active Open...*/
            WARN_ON(1);
        cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
        type = NES_CM_EVENT_MPA_REQ;
        atomic_set(&cm_node->passive_state,
               NES_PASSIVE_STATE_INDICATED);
        break;
    case NES_CM_STATE_MPAREQ_SENT:
        cleanup_retrans_entry(cm_node);
        if (res_type == NES_MPA_REQUEST_REJECT) {
            type = NES_CM_EVENT_MPA_REJECT;
            cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
        } else {
            type = NES_CM_EVENT_CONNECTED;
            cm_node->state = NES_CM_STATE_TSA;
        }

        break;
    default:
        WARN_ON(1);
        break;
    }
    dev_kfree_skb_any(skb);
    create_event(cm_node, type);
}

static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
{
    switch (cm_node->state) {
    case NES_CM_STATE_SYN_SENT:
    case NES_CM_STATE_MPAREQ_SENT:
        nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
              "listener=%p state=%d\n", __func__, __LINE__, cm_node,
              cm_node->listener, cm_node->state);
        active_open_err(cm_node, skb, 1);
        break;
    case NES_CM_STATE_ESTABLISHED:
    case NES_CM_STATE_SYN_RCVD:
        passive_open_err(cm_node, skb, 1);
        break;
    case NES_CM_STATE_TSA:
    default:
        drop_packet(skb);
    }
}

static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
             struct sk_buff *skb)
{
    int err;

    err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num)) ? 0 : 1;
    if (err)
        active_open_err(cm_node, skb, 1);

    return err;
}

static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
             struct sk_buff *skb)
{
    int err = 0;
    u32 seq;
    u32 ack_seq;
    u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
    u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
    u32 rcv_wnd;

    seq = ntohl(tcph->seq);
    ack_seq = ntohl(tcph->ack_seq);
    rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
    if (ack_seq != loc_seq_num)
        err = 1;
    else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
        err = 1;
    if (err) {
        nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
              "listener=%p state=%d\n", __func__, __LINE__, cm_node,
              cm_node->listener, cm_node->state);
        indicate_pkt_err(cm_node, skb);
        nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
              "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
              rcv_wnd);
    }
    return err;
}

/*
 * handle_syn_pkt() is for Passive node. The syn packet is received when a node
 * is created with a listener or it may comein as rexmitted packet which in
 * that case will be just dropped.
 */
static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
               struct tcphdr *tcph)
{
    int ret;
    u32 inc_sequence;
    int optionsize;

    optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
    skb_trim(skb, 0);
    inc_sequence = ntohl(tcph->seq);

    switch (cm_node->state) {
    case NES_CM_STATE_SYN_SENT:
    case NES_CM_STATE_MPAREQ_SENT:
        /* Rcvd syn on active open connection*/
        active_open_err(cm_node, skb, 1);
        break;
    case NES_CM_STATE_LISTENING:
        /* Passive OPEN */
        if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
            cm_node->listener->backlog) {
            nes_debug(NES_DBG_CM, "drop syn due to backlog "
                  "pressure \n");
            cm_backlog_drops++;
            passive_open_err(cm_node, skb, 0);
            break;
        }
        ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
                     1);
        if (ret) {
            passive_open_err(cm_node, skb, 0);
            /* drop pkt */
            break;
        }
        cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
        BUG_ON(cm_node->send_entry);
        cm_node->accept_pend = 1;
        atomic_inc(&cm_node->listener->pend_accepts_cnt);

        cm_node->state = NES_CM_STATE_SYN_RCVD;
        send_syn(cm_node, 1, skb);
        break;
    case NES_CM_STATE_CLOSED:
        cleanup_retrans_entry(cm_node);
        add_ref_cm_node(cm_node);
        send_reset(cm_node, skb);
        break;
    case NES_CM_STATE_TSA:
    case NES_CM_STATE_ESTABLISHED:
    case NES_CM_STATE_FIN_WAIT1:
    case NES_CM_STATE_FIN_WAIT2:
    case NES_CM_STATE_MPAREQ_RCVD:
    case NES_CM_STATE_LAST_ACK:
    case NES_CM_STATE_CLOSING:
    case NES_CM_STATE_UNKNOWN:
    default:
        drop_packet(skb);
        break;
    }
}

static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
                  struct tcphdr *tcph)
{
    int ret;
    u32 inc_sequence;
    int optionsize;

    optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
    skb_trim(skb, 0);
    inc_sequence = ntohl(tcph->seq);
    switch (cm_node->state) {
    case NES_CM_STATE_SYN_SENT:
        cleanup_retrans_entry(cm_node);
        /* active open */
        if (check_syn(cm_node, tcph, skb))
            return;
        cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
        /* setup options */
        ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
        if (ret) {
            nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
                  cm_node);
            break;
        }
        cleanup_retrans_entry(cm_node);
        cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
        send_mpa_request(cm_node, skb);
        cm_node->state = NES_CM_STATE_MPAREQ_SENT;
        break;
    case NES_CM_STATE_MPAREQ_RCVD:
        /* passive open, so should not be here */
        passive_open_err(cm_node, skb, 1);
        break;
    case NES_CM_STATE_LISTENING:
        cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
        cleanup_retrans_entry(cm_node);
        cm_node->state = NES_CM_STATE_CLOSED;
        send_reset(cm_node, skb);
        break;
    case NES_CM_STATE_CLOSED:
        cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
        cleanup_retrans_entry(cm_node);
        add_ref_cm_node(cm_node);
        send_reset(cm_node, skb);
        break;
    case NES_CM_STATE_ESTABLISHED:
    case NES_CM_STATE_FIN_WAIT1:
    case NES_CM_STATE_FIN_WAIT2:
    case NES_CM_STATE_LAST_ACK:
    case NES_CM_STATE_TSA:
    case NES_CM_STATE_CLOSING:
    case NES_CM_STATE_UNKNOWN:
    case NES_CM_STATE_MPAREQ_SENT:
    default:
        drop_packet(skb);
        break;
    }
}

static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
              struct tcphdr *tcph)
{
    int datasize = 0;
    u32 inc_sequence;
    int ret = 0;
    int optionsize;

    optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);

    if (check_seq(cm_node, tcph, skb))
        return -EINVAL;

    skb_pull(skb, tcph->doff << 2);
    inc_sequence = ntohl(tcph->seq);
    datasize = skb->len;
    switch (cm_node->state) {
    case NES_CM_STATE_SYN_RCVD:
        /* Passive OPEN */
        cleanup_retrans_entry(cm_node);
        ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
        if (ret)
            break;
        cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
        cm_node->state = NES_CM_STATE_ESTABLISHED;
        if (datasize) {
            cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
            handle_rcv_mpa(cm_node, skb);
        } else { /* rcvd ACK only */
            dev_kfree_skb_any(skb);
        }
        break;
    case NES_CM_STATE_ESTABLISHED:
        /* Passive OPEN */
        cleanup_retrans_entry(cm_node);
        if (datasize) {
            cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
            handle_rcv_mpa(cm_node, skb);
        } else {
            drop_packet(skb);
        }
        break;
    case NES_CM_STATE_MPAREQ_SENT:
        cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
        if (datasize) {
            cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
            handle_rcv_mpa(cm_node, skb);
        } else { /* Could be just an ack pkt.. */
            dev_kfree_skb_any(skb);
        }
        break;
    case NES_CM_STATE_LISTENING:
        cleanup_retrans_entry(cm_node);
        cm_node->state = NES_CM_STATE_CLOSED;
        send_reset(cm_node, skb);
        break;
    case NES_CM_STATE_CLOSED:
        cleanup_retrans_entry(cm_node);
        add_ref_cm_node(cm_node);
        send_reset(cm_node, skb);
        break;
    case NES_CM_STATE_LAST_ACK:
    case NES_CM_STATE_CLOSING:
        cleanup_retrans_entry(cm_node);
        cm_node->state = NES_CM_STATE_CLOSED;
        cm_node->cm_id->rem_ref(cm_node->cm_id);
        rem_ref_cm_node(cm_node->cm_core, cm_node);
        drop_packet(skb);
        break;
    case NES_CM_STATE_FIN_WAIT1:
        cleanup_retrans_entry(cm_node);
        drop_packet(skb);
        cm_node->state = NES_CM_STATE_FIN_WAIT2;
        break;
    case NES_CM_STATE_SYN_SENT:
    case NES_CM_STATE_FIN_WAIT2:
    case NES_CM_STATE_TSA:
    case NES_CM_STATE_MPAREQ_RCVD:
    case NES_CM_STATE_UNKNOWN:
    default:
        cleanup_retrans_entry(cm_node);
        drop_packet(skb);
        break;
    }
    return ret;
}



static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
                  struct sk_buff *skb, int optionsize, int passive)
{
    u8 *optionsloc = (u8 *)&tcph[1];

    if (optionsize) {
        if (process_options(cm_node, optionsloc, optionsize,
                    (u32)tcph->syn)) {
            nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
                  __func__, cm_node);
            if (passive)
                passive_open_err(cm_node, skb, 1);
            else
                active_open_err(cm_node, skb, 1);
            return 1;
        }
    }

    cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
                     cm_node->tcp_cntxt.snd_wscale;

    if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
        cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
    return 0;
}

/*
 * active_open_err() will send reset() if flag set..
 * It will also send ABORT event.
 */
static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
                int reset)
{
    cleanup_retrans_entry(cm_node);
    if (reset) {
        nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
              "state=%d\n", cm_node, cm_node->state);
        add_ref_cm_node(cm_node);
        send_reset(cm_node, skb);
    } else {
        dev_kfree_skb_any(skb);
    }

    cm_node->state = NES_CM_STATE_CLOSED;
    create_event(cm_node, NES_CM_EVENT_ABORTED);
}

/*
 * passive_open_err() will either do a reset() or will free up the skb and
 * remove the cm_node.
 */
static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
                 int reset)
{
    cleanup_retrans_entry(cm_node);
    cm_node->state = NES_CM_STATE_CLOSED;
    if (reset) {
        nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
              "cm_node=%p state =%d\n", cm_node, cm_node->state);
        send_reset(cm_node, skb);
    } else {
        dev_kfree_skb_any(skb);
        rem_ref_cm_node(cm_node->cm_core, cm_node);
    }
}

/*
 * free_retrans_entry() routines assumes that the retrans_list_lock has
 * been acquired before calling.
 */
static void free_retrans_entry(struct nes_cm_node *cm_node)
{
    struct nes_timer_entry *send_entry;

    send_entry = cm_node->send_entry;
    if (send_entry) {
        cm_node->send_entry = NULL;
        dev_kfree_skb_any(send_entry->skb);
        kfree(send_entry);
        rem_ref_cm_node(cm_node->cm_core, cm_node);
    }
}

static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
{
    unsigned long flags;

    spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
    free_retrans_entry(cm_node);
    spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
}

static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
               struct nes_cm_core *cm_core)
{
    enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
    struct tcphdr *tcph = tcp_hdr(skb);
    u32 fin_set = 0;
    int ret = 0;

    skb_pull(skb, ip_hdr(skb)->ihl << 2);

    nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
          "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
          tcph->ack, tcph->rst, tcph->fin);

    if (tcph->rst) {
        pkt_type = NES_PKT_TYPE_RST;
    } else if (tcph->syn) {
        pkt_type = NES_PKT_TYPE_SYN;
        if (tcph->ack)
            pkt_type = NES_PKT_TYPE_SYNACK;
    } else if (tcph->ack) {
        pkt_type = NES_PKT_TYPE_ACK;
    }
    if (tcph->fin)
        fin_set = 1;

    switch (pkt_type) {
    case NES_PKT_TYPE_SYN:
        handle_syn_pkt(cm_node, skb, tcph);
        break;
    case NES_PKT_TYPE_SYNACK:
        handle_synack_pkt(cm_node, skb, tcph);
        break;
    case NES_PKT_TYPE_ACK:
        ret = handle_ack_pkt(cm_node, skb, tcph);
        if (fin_set && !ret)
            handle_fin_pkt(cm_node);
        break;
    case NES_PKT_TYPE_RST:
        handle_rst_pkt(cm_node, skb, tcph);
        break;
    default:
        if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
            handle_fin_pkt(cm_node);
        drop_packet(skb);
        break;
    }
}

static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
                          struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
{
    struct nes_cm_listener *listener;
    unsigned long flags;

    nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
          cm_info->loc_addr, cm_info->loc_port);

    /* cannot have multiple matching listeners */
    listener = find_listener(cm_core, htonl(cm_info->loc_addr),
                 htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
    if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
        /* find automatically incs ref count ??? */
        atomic_dec(&listener->ref_count);
        nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
        return NULL;
    }

    if (!listener) {
        /* create a CM listen node (1/2 node to compare incoming traffic to) */
        listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
        if (!listener) {
            nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
            return NULL;
        }

        listener->loc_addr = htonl(cm_info->loc_addr);
        listener->loc_port = htons(cm_info->loc_port);
        listener->reused_node = 0;

        atomic_set(&listener->ref_count, 1);
    }
    /* pasive case */
    /* find already inc'ed the ref count */
    else {
        listener->reused_node = 1;
    }

    listener->cm_id = cm_info->cm_id;
    atomic_set(&listener->pend_accepts_cnt, 0);
    listener->cm_core = cm_core;
    listener->nesvnic = nesvnic;
    atomic_inc(&cm_core->node_cnt);

    listener->conn_type = cm_info->conn_type;
    listener->backlog = cm_info->backlog;
    listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;

    if (!listener->reused_node) {
        spin_lock_irqsave(&cm_core->listen_list_lock, flags);
        list_add(&listener->list, &cm_core->listen_list.list);
        spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
        atomic_inc(&cm_core->listen_node_cnt);
    }

    nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
          " listener = %p, backlog = %d, cm_id = %p.\n",
          cm_info->loc_addr, cm_info->loc_port,
          listener, listener->backlog, listener->cm_id);

    return listener;
}


static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
                       struct nes_vnic *nesvnic, u16 private_data_len,
                       void *private_data, struct nes_cm_info *cm_info)
{
    int ret = 0;
    struct nes_cm_node *cm_node;
    struct nes_cm_listener *loopbackremotelistener;
    struct nes_cm_node *loopbackremotenode;
    struct nes_cm_info loopback_cm_info;
    u8 *start_buff;

    /* create a CM connection node */
    cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
    if (!cm_node)
        return NULL;

    /* set our node side to client (active) side */
    cm_node->tcp_cntxt.client = 1;
    cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;

    if (cm_info->loc_addr == cm_info->rem_addr) {
        loopbackremotelistener = find_listener(cm_core,
                               ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
                               NES_CM_LISTENER_ACTIVE_STATE);
        if (loopbackremotelistener == NULL) {
            create_event(cm_node, NES_CM_EVENT_ABORTED);
        } else {
            loopback_cm_info = *cm_info;
            loopback_cm_info.loc_port = cm_info->rem_port;
            loopback_cm_info.rem_port = cm_info->loc_port;
            loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
            loopbackremotenode = make_cm_node(cm_core, nesvnic,
                              &loopback_cm_info, loopbackremotelistener);
            if (!loopbackremotenode) {
                rem_ref_cm_node(cm_node->cm_core, cm_node);
                return NULL;
            }
            atomic_inc(&cm_loopbacks);
            loopbackremotenode->loopbackpartner = cm_node;
            loopbackremotenode->tcp_cntxt.rcv_wscale =
                NES_CM_DEFAULT_RCV_WND_SCALE;
            cm_node->loopbackpartner = loopbackremotenode;
            memcpy(loopbackremotenode->mpa_frame_buf, private_data,
                   private_data_len);
            loopbackremotenode->mpa_frame_size = private_data_len;

            /* we are done handling this state. */
            /* set node to a TSA state */
            cm_node->state = NES_CM_STATE_TSA;
            cm_node->tcp_cntxt.rcv_nxt =
                loopbackremotenode->tcp_cntxt.loc_seq_num;
            loopbackremotenode->tcp_cntxt.rcv_nxt =
                cm_node->tcp_cntxt.loc_seq_num;
            cm_node->tcp_cntxt.max_snd_wnd =
                loopbackremotenode->tcp_cntxt.rcv_wnd;
            loopbackremotenode->tcp_cntxt.max_snd_wnd =
                cm_node->tcp_cntxt.rcv_wnd;
            cm_node->tcp_cntxt.snd_wnd =
                loopbackremotenode->tcp_cntxt.rcv_wnd;
            loopbackremotenode->tcp_cntxt.snd_wnd =
                cm_node->tcp_cntxt.rcv_wnd;
            cm_node->tcp_cntxt.snd_wscale =
                loopbackremotenode->tcp_cntxt.rcv_wscale;
            loopbackremotenode->tcp_cntxt.snd_wscale =
                cm_node->tcp_cntxt.rcv_wscale;
            loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
            create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
        }
        return cm_node;
    }

    start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
    cm_node->mpa_frame_size = private_data_len;

    memcpy(start_buff, private_data, private_data_len);

    /* send a syn and goto syn sent state */
    cm_node->state = NES_CM_STATE_SYN_SENT;
    ret = send_syn(cm_node, 0, NULL);

    if (ret) {
        /* error in sending the syn free up the cm_node struct */
        nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
              "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
              cm_node->rem_addr, cm_node->rem_port, cm_node,
              cm_node->cm_id);
        rem_ref_cm_node(cm_node->cm_core, cm_node);
        cm_node = NULL;
    }

    if (cm_node) {
        nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
              "port=0x%04x, cm_node=%p, cm_id = %p.\n",
              cm_node->rem_addr, cm_node->rem_port, cm_node,
              cm_node->cm_id);
    }

    return cm_node;
}


static int mini_cm_accept(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
{
    return 0;
}


static int mini_cm_reject(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
{
    int ret = 0;
    int err = 0;
    int passive_state;
    struct nes_cm_event event;
    struct iw_cm_id *cm_id = cm_node->cm_id;
    struct nes_cm_node *loopback = cm_node->loopbackpartner;

    nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
          __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);

    if (cm_node->tcp_cntxt.client)
        return ret;
    cleanup_retrans_entry(cm_node);

    if (!loopback) {
        passive_state = atomic_add_return(1, &cm_node->passive_state);
        if (passive_state == NES_SEND_RESET_EVENT) {
            cm_node->state = NES_CM_STATE_CLOSED;
            rem_ref_cm_node(cm_core, cm_node);
        } else {
            if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
                rem_ref_cm_node(cm_core, cm_node);
            } else {
                ret = send_mpa_reject(cm_node);
                if (ret) {
                    cm_node->state = NES_CM_STATE_CLOSED;
                    err = send_reset(cm_node, NULL);
                    if (err)
                        WARN_ON(1);
                } else {
                    cm_id->add_ref(cm_id);
                }
            }
        }
    } else {
        cm_node->cm_id = NULL;
        if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
            rem_ref_cm_node(cm_core, cm_node);
            rem_ref_cm_node(cm_core, loopback);
        } else {
            event.cm_node = loopback;
            event.cm_info.rem_addr = loopback->rem_addr;
            event.cm_info.loc_addr = loopback->loc_addr;
            event.cm_info.rem_port = loopback->rem_port;
            event.cm_info.loc_port = loopback->loc_port;
            event.cm_info.cm_id = loopback->cm_id;
            cm_event_mpa_reject(&event);
            rem_ref_cm_node(cm_core, cm_node);
            loopback->state = NES_CM_STATE_CLOSING;

            cm_id = loopback->cm_id;
            rem_ref_cm_node(cm_core, loopback);
            cm_id->rem_ref(cm_id);
        }
    }

    return ret;
}


static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
{
    int ret = 0;

    if (!cm_core || !cm_node)
        return -EINVAL;

    switch (cm_node->state) {
    case NES_CM_STATE_SYN_RCVD:
    case NES_CM_STATE_SYN_SENT:
    case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
    case NES_CM_STATE_ESTABLISHED:
    case NES_CM_STATE_ACCEPTING:
    case NES_CM_STATE_MPAREQ_SENT:
    case NES_CM_STATE_MPAREQ_RCVD:
        cleanup_retrans_entry(cm_node);
        send_reset(cm_node, NULL);
        break;
    case NES_CM_STATE_CLOSE_WAIT:
        cm_node->state = NES_CM_STATE_LAST_ACK;
        send_fin(cm_node, NULL);
        break;
    case NES_CM_STATE_FIN_WAIT1:
    case NES_CM_STATE_FIN_WAIT2:
    case NES_CM_STATE_LAST_ACK:
    case NES_CM_STATE_TIME_WAIT:
    case NES_CM_STATE_CLOSING:
        ret = -1;
        break;
    case NES_CM_STATE_LISTENING:
        cleanup_retrans_entry(cm_node);
        send_reset(cm_node, NULL);
        break;
    case NES_CM_STATE_MPAREJ_RCVD:
    case NES_CM_STATE_UNKNOWN:
    case NES_CM_STATE_INITED:
    case NES_CM_STATE_CLOSED:
    case NES_CM_STATE_LISTENER_DESTROYED:
        ret = rem_ref_cm_node(cm_core, cm_node);
        break;
    case NES_CM_STATE_TSA:
        if (cm_node->send_entry)
            printk(KERN_ERR "ERROR Close got called from STATE_TSA "
                   "send_entry=%p\n", cm_node->send_entry);
        ret = rem_ref_cm_node(cm_core, cm_node);
        break;
    }
    return ret;
}


static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
                struct nes_vnic *nesvnic, struct sk_buff *skb)
{
    struct nes_cm_node *cm_node = NULL;
    struct nes_cm_listener *listener = NULL;
    struct iphdr *iph;
    struct tcphdr *tcph;
    struct nes_cm_info nfo;
    int skb_handled = 1;
    __be32 tmp_daddr, tmp_saddr;

    if (!skb)
        return 0;
    if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr))
        return 0;

    iph = (struct iphdr *)skb->data;
    tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));

    nfo.loc_addr = ntohl(iph->daddr);
    nfo.loc_port = ntohs(tcph->dest);
    nfo.rem_addr = ntohl(iph->saddr);
    nfo.rem_port = ntohs(tcph->source);

    tmp_daddr = cpu_to_be32(iph->daddr);
    tmp_saddr = cpu_to_be32(iph->saddr);

    nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
          &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);

    do {
        cm_node = find_node(cm_core,
                    nfo.rem_port, nfo.rem_addr,
                    nfo.loc_port, nfo.loc_addr);

        if (!cm_node) {
            /* Only type of packet accepted are for */
            /* the PASSIVE open (syn only) */
            if ((!tcph->syn) || (tcph->ack)) {
                skb_handled = 0;
                break;
            }
            listener = find_listener(cm_core, nfo.loc_addr,
                         nfo.loc_port,
                         NES_CM_LISTENER_ACTIVE_STATE);
            if (!listener) {
                nfo.cm_id = NULL;
                nfo.conn_type = 0;
                nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
                skb_handled = 0;
                break;
            }
            nfo.cm_id = listener->cm_id;
            nfo.conn_type = listener->conn_type;
            cm_node = make_cm_node(cm_core, nesvnic, &nfo,
                           listener);
            if (!cm_node) {
                nes_debug(NES_DBG_CM, "Unable to allocate "
                      "node\n");
                cm_packets_dropped++;
                atomic_dec(&listener->ref_count);
                dev_kfree_skb_any(skb);
                break;
            }
            if (!tcph->rst && !tcph->fin) {
                cm_node->state = NES_CM_STATE_LISTENING;
            } else {
                cm_packets_dropped++;
                rem_ref_cm_node(cm_core, cm_node);
                dev_kfree_skb_any(skb);
                break;
            }
            add_ref_cm_node(cm_node);
        } else if (cm_node->state == NES_CM_STATE_TSA) {
            if (cm_node->nesqp->pau_mode)
                nes_queue_mgt_skbs(skb, nesvnic, cm_node->nesqp);
            else {
                rem_ref_cm_node(cm_core, cm_node);
                atomic_inc(&cm_accel_dropped_pkts);
                dev_kfree_skb_any(skb);
            }
            break;
        }
        skb_reset_network_header(skb);
        skb_set_transport_header(skb, sizeof(*tcph));
        skb->len = ntohs(iph->tot_len);
        process_packet(cm_node, skb, cm_core);
        rem_ref_cm_node(cm_core, cm_node);
    } while (0);
    return skb_handled;
}


static struct nes_cm_core *nes_cm_alloc_core(void)
{
    struct nes_cm_core *cm_core;

    /* setup the CM core */
    /* alloc top level core control structure */
    cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
    if (!cm_core)
        return NULL;

    INIT_LIST_HEAD(&cm_core->connected_nodes);
    init_timer(&cm_core->tcp_timer);
    cm_core->tcp_timer.function = nes_cm_timer_tick;

    cm_core->mtu = NES_CM_DEFAULT_MTU;
    cm_core->state = NES_CM_STATE_INITED;
    cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;

    atomic_set(&cm_core->events_posted, 0);

    cm_core->api = &nes_cm_api;

    spin_lock_init(&cm_core->ht_lock);
    spin_lock_init(&cm_core->listen_list_lock);

    INIT_LIST_HEAD(&cm_core->listen_list.list);

    nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);

    nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
    cm_core->event_wq = create_singlethread_workqueue("nesewq");
    cm_core->post_event = nes_cm_post_event;
    nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
    cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");

    print_core(cm_core);
    return cm_core;
}


static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
{
    nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);

    if (!cm_core)
        return -EINVAL;

    barrier();

    if (timer_pending(&cm_core->tcp_timer))
        del_timer(&cm_core->tcp_timer);

    destroy_workqueue(cm_core->event_wq);
    destroy_workqueue(cm_core->disconn_wq);
    nes_debug(NES_DBG_CM, "\n");
    kfree(cm_core);

    return 0;
}


static int mini_cm_get(struct nes_cm_core *cm_core)
{
    return cm_core->state;
}


static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
{
    int ret = 0;

    switch (type) {
    case NES_CM_SET_PKT_SIZE:
        cm_core->mtu = value;
        break;
    case NES_CM_SET_FREE_PKT_Q_SIZE:
        cm_core->free_tx_pkt_max = value;
        break;
    default:
        /* unknown set option */
        ret = -EINVAL;
    }

    return ret;
}


static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
{
    int ret = 0;

    if (!nesqp)
        return -EINVAL;

    nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
                          NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
                          NES_QPCONTEXT_MISC_DROS);

    if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
        nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);

    nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);

    nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);

    nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
        (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);

    nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
        (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
        NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);

    nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
        (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
        NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);

    nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
    nesqp->nesqp_context->ts_recent = 0;
    nesqp->nesqp_context->ts_age = 0;
    nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
    nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
    nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
    nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
                            cm_node->tcp_cntxt.rcv_wscale);
    nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
    nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
    nesqp->nesqp_context->srtt = 0;
    nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
    nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
    nesqp->nesqp_context->cwnd = cpu_to_le32(2 * cm_node->tcp_cntxt.mss);
    nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
    nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
    nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);

    nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
          " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
          nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
          le32_to_cpu(nesqp->nesqp_context->snd_nxt),
          cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
          le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
          le32_to_cpu(nesqp->nesqp_context->misc));
    nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
    nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
    nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));

    nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
    cm_node->state = NES_CM_STATE_TSA;

    return ret;
}


int nes_cm_disconn(struct nes_qp *nesqp)
{
    struct disconn_work *work;

    work = kzalloc(sizeof *work, GFP_ATOMIC);
    if (!work)
        return -ENOMEM;  /* Timer will clean up */

    nes_add_ref(&nesqp->ibqp);
    work->nesqp = nesqp;
    INIT_WORK(&work->work, nes_disconnect_worker);
    queue_work(g_cm_core->disconn_wq, &work->work);
    return 0;
}


static void nes_disconnect_worker(struct work_struct *work)
{
    struct disconn_work *dwork = container_of(work, struct disconn_work, work);
    struct nes_qp *nesqp = dwork->nesqp;

    kfree(dwork);
    nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
          nesqp->last_aeq, nesqp->hwqp.qp_id);
    nes_cm_disconn_true(nesqp);
    nes_rem_ref(&nesqp->ibqp);
}


static int nes_cm_disconn_true(struct nes_qp *nesqp)
{
    unsigned long flags;
    int ret = 0;
    struct iw_cm_id *cm_id;
    struct iw_cm_event cm_event;
    struct nes_vnic *nesvnic;
    u16 last_ae;
    u8 original_hw_tcp_state;
    u8 original_ibqp_state;
    int disconn_status = 0;
    int issue_disconn = 0;
    int issue_close = 0;
    int issue_flush = 0;
    u32 flush_q = NES_CQP_FLUSH_RQ;
    struct ib_event ibevent;

    if (!nesqp) {
        nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
        return -1;
    }

    spin_lock_irqsave(&nesqp->lock, flags);
    cm_id = nesqp->cm_id;
    /* make sure we havent already closed this connection */
    if (!cm_id) {
        nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
              nesqp->hwqp.qp_id);
        spin_unlock_irqrestore(&nesqp->lock, flags);
        return -1;
    }

    nesvnic = to_nesvnic(nesqp->ibqp.device);
    nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);

    original_hw_tcp_state = nesqp->hw_tcp_state;
    original_ibqp_state = nesqp->ibqp_state;
    last_ae = nesqp->last_aeq;

    if (nesqp->term_flags) {
        issue_disconn = 1;
        issue_close = 1;
        nesqp->cm_id = NULL;
        del_timer(&nesqp->terminate_timer);
        if (nesqp->flush_issued == 0) {
            nesqp->flush_issued = 1;
            issue_flush = 1;
        }
    } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
            ((original_ibqp_state == IB_QPS_RTS) &&
            (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
        issue_disconn = 1;
        if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
            disconn_status = -ECONNRESET;
    }

    if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
         (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
         (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
         (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
        issue_close = 1;
        nesqp->cm_id = NULL;
        if (nesqp->flush_issued == 0) {
            nesqp->flush_issued = 1;
            issue_flush = 1;
        }
    }

    spin_unlock_irqrestore(&nesqp->lock, flags);

    if ((issue_flush) && (nesqp->destroyed == 0)) {
        /* Flush the queue(s) */
        if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
            flush_q |= NES_CQP_FLUSH_SQ;
        flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);

        if (nesqp->term_flags) {
            ibevent.device = nesqp->ibqp.device;
            ibevent.event = nesqp->terminate_eventtype;
            ibevent.element.qp = &nesqp->ibqp;
            if (nesqp->ibqp.event_handler)
                nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
        }
    }

    if ((cm_id) && (cm_id->event_handler)) {
        if (issue_disconn) {
            atomic_inc(&cm_disconnects);
            cm_event.event = IW_CM_EVENT_DISCONNECT;
            cm_event.status = disconn_status;
            cm_event.local_addr = cm_id->local_addr;
            cm_event.remote_addr = cm_id->remote_addr;
            cm_event.private_data = NULL;
            cm_event.private_data_len = 0;

            nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
                  " for  QP%u, SQ Head = %u, SQ Tail = %u. "
                  "cm_id = %p, refcount = %u.\n",
                  nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
                  nesqp->hwqp.sq_tail, cm_id,
                  atomic_read(&nesqp->refcount));

            ret = cm_id->event_handler(cm_id, &cm_event);
            if (ret)
                nes_debug(NES_DBG_CM, "OFA CM event_handler "
                      "returned, ret=%d\n", ret);
        }

        if (issue_close) {
            atomic_inc(&cm_closes);
            nes_disconnect(nesqp, 1);

            cm_id->provider_data = nesqp;
            /* Send up the close complete event */
            cm_event.event = IW_CM_EVENT_CLOSE;
            cm_event.status = 0;
            cm_event.provider_data = cm_id->provider_data;
            cm_event.local_addr = cm_id->local_addr;
            cm_event.remote_addr = cm_id->remote_addr;
            cm_event.private_data = NULL;
            cm_event.private_data_len = 0;

            ret = cm_id->event_handler(cm_id, &cm_event);
            if (ret)
                nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);

            cm_id->rem_ref(cm_id);
        }
    }

    return 0;
}


static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
{
    int ret = 0;
    struct nes_vnic *nesvnic;
    struct nes_device *nesdev;
    struct nes_ib_device *nesibdev;

    nesvnic = to_nesvnic(nesqp->ibqp.device);
    if (!nesvnic)
        return -EINVAL;

    nesdev = nesvnic->nesdev;
    nesibdev = nesvnic->nesibdev;

    nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
            netdev_refcnt_read(nesvnic->netdev));

    if (nesqp->active_conn) {

        /* indicate this connection is NOT active */
        nesqp->active_conn = 0;
    } else {
        /* Need to free the Last Streaming Mode Message */
        if (nesqp->ietf_frame) {
            if (nesqp->lsmm_mr)
                nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
            pci_free_consistent(nesdev->pcidev,
                        nesqp->private_data_len + nesqp->ietf_frame_size,
                        nesqp->ietf_frame, nesqp->ietf_frame_pbase);
        }
    }

    /* close the CM node down if it is still active */
    if (nesqp->cm_node) {
        nes_debug(NES_DBG_CM, "Call close API\n");

        g_cm_core->api->close(g_cm_core, nesqp->cm_node);
    }

    return ret;
}


int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
    u64 u64temp;
    struct ib_qp *ibqp;
    struct nes_qp *nesqp;
    struct nes_vnic *nesvnic;
    struct nes_device *nesdev;
    struct nes_cm_node *cm_node;
    struct nes_adapter *adapter;
    struct ib_qp_attr attr;
    struct iw_cm_event cm_event;
    struct nes_hw_qp_wqe *wqe;
    struct nes_v4_quad nes_quad;
    u32 crc_value;
    int ret;
    int passive_state;
    struct nes_ib_device *nesibdev;
    struct ib_mr *ibmr = NULL;
    struct ib_phys_buf ibphysbuf;
    struct nes_pd *nespd;
    u64 tagged_offset;
    u8 mpa_frame_offset = 0;
    struct ietf_mpa_v2 *mpa_v2_frame;
    u8 start_addr = 0;
    u8 *start_ptr = &start_addr;
    u8 **start_buff = &start_ptr;
    u16 buff_len = 0;

    ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
    if (!ibqp)
        return -EINVAL;

    /* get all our handles */
    nesqp = to_nesqp(ibqp);
    nesvnic = to_nesvnic(nesqp->ibqp.device);
    nesdev = nesvnic->nesdev;
    adapter = nesdev->nesadapter;

    cm_node = (struct nes_cm_node *)cm_id->provider_data;
    nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
        "%s\n", cm_node, nesvnic, nesvnic->netdev,
        nesvnic->netdev->name);

    if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
        if (cm_node->loopbackpartner)
            rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
        rem_ref_cm_node(cm_node->cm_core, cm_node);
        return -EINVAL;
    }

    passive_state = atomic_add_return(1, &cm_node->passive_state);
    if (passive_state == NES_SEND_RESET_EVENT) {
        rem_ref_cm_node(cm_node->cm_core, cm_node);
        return -ECONNRESET;
    }

    /* associate the node with the QP */
    nesqp->cm_node = (void *)cm_node;
    cm_node->nesqp = nesqp;

    nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
        nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
    atomic_inc(&cm_accepts);

    nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
            netdev_refcnt_read(nesvnic->netdev));

    nesqp->ietf_frame_size = sizeof(struct ietf_mpa_v2);
    /* allocate the ietf frame and space for private data */
    nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
                         nesqp->ietf_frame_size + conn_param->private_data_len,
                         &nesqp->ietf_frame_pbase);

    if (!nesqp->ietf_frame) {
        nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
        return -ENOMEM;
    }
    mpa_v2_frame = (struct ietf_mpa_v2 *)nesqp->ietf_frame;

    if (cm_node->mpa_frame_rev == IETF_MPA_V1)
        mpa_frame_offset = 4;

    memcpy(mpa_v2_frame->priv_data, conn_param->private_data,
           conn_param->private_data_len);

    cm_build_mpa_frame(cm_node, start_buff, &buff_len, nesqp->ietf_frame, MPA_KEY_REPLY);
    nesqp->private_data_len = conn_param->private_data_len;

    /* setup our first outgoing iWarp send WQE (the IETF frame response) */
    wqe = &nesqp->hwqp.sq_vbase[0];

    if (cm_id->remote_addr.sin_addr.s_addr !=
        cm_id->local_addr.sin_addr.s_addr) {
        u64temp = (unsigned long)nesqp;
        nesibdev = nesvnic->nesibdev;
        nespd = nesqp->nespd;
        ibphysbuf.addr = nesqp->ietf_frame_pbase + mpa_frame_offset;
        ibphysbuf.size = buff_len;
        tagged_offset = (u64)(unsigned long)*start_buff;
        ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
                           &ibphysbuf, 1,
                           IB_ACCESS_LOCAL_WRITE,
                           &tagged_offset);
        if (!ibmr) {
            nes_debug(NES_DBG_CM, "Unable to register memory region"
                  "for lSMM for cm_node = %p \n",
                  cm_node);
            pci_free_consistent(nesdev->pcidev,
                        nesqp->private_data_len + nesqp->ietf_frame_size,
                        nesqp->ietf_frame, nesqp->ietf_frame_pbase);
            return -ENOMEM;
        }

        ibmr->pd = &nespd->ibpd;
        ibmr->device = nespd->ibpd.device;
        nesqp->lsmm_mr = ibmr;

        u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
        set_wqe_64bit_value(wqe->wqe_words,
                    NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
                    u64temp);
        wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
            cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
                    NES_IWARP_SQ_WQE_WRPDU);
        wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
            cpu_to_le32(buff_len);
        set_wqe_64bit_value(wqe->wqe_words,
                    NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
                    (u64)(unsigned long)(*start_buff));
        wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
            cpu_to_le32(buff_len);
        wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
        if (nesqp->sq_kmapped) {
            nesqp->sq_kmapped = 0;
            kunmap(nesqp->page);
        }

        nesqp->nesqp_context->ird_ord_sizes |=
            cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
                    NES_QPCONTEXT_ORDIRD_WRPDU);
    } else {
        nesqp->nesqp_context->ird_ord_sizes |=
            cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
    }
    nesqp->skip_lsmm = 1;


    /* Cache the cm_id in the qp */
    nesqp->cm_id = cm_id;
    cm_node->cm_id = cm_id;

    /*  nesqp->cm_node = (void *)cm_id->provider_data; */
    cm_id->provider_data = nesqp;
    nesqp->active_conn = 0;

    if (cm_node->state == NES_CM_STATE_TSA)
        nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
              cm_node);

    nes_cm_init_tsa_conn(nesqp, cm_node);

    nesqp->nesqp_context->tcpPorts[0] =
        cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
    nesqp->nesqp_context->tcpPorts[1] =
        cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));

    nesqp->nesqp_context->ip0 =
            cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));

    nesqp->nesqp_context->misc2 |= cpu_to_le32(
        (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
        NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);

    nesqp->nesqp_context->arp_index_vlan |=
        cpu_to_le32(nes_arp_table(nesdev,
                      le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
                      NES_ARP_RESOLVE) << 16);

    nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
        jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));

    nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);

    nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
        ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
    nesqp->nesqp_context->ird_ord_sizes |=
        cpu_to_le32((u32)conn_param->ord);

    memset(&nes_quad, 0, sizeof(nes_quad));
    nes_quad.DstIpAdrIndex =
        cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
    nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
    nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
    nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;

    /* Produce hash key */
    crc_value = get_crc_value(&nes_quad);
    nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
    nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
          nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);

    nesqp->hte_index &= adapter->hte_index_mask;
    nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);

    cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);

    nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
          "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
          "private data length=%u.\n", nesqp->hwqp.qp_id,
          ntohl(cm_id->remote_addr.sin_addr.s_addr),
          ntohs(cm_id->remote_addr.sin_port),
          ntohl(cm_id->local_addr.sin_addr.s_addr),
          ntohs(cm_id->local_addr.sin_port),
          le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
          le32_to_cpu(nesqp->nesqp_context->snd_nxt),
          buff_len);

    /* notify OF layer that accept event was successful */
    cm_id->add_ref(cm_id);
    nes_add_ref(&nesqp->ibqp);

    cm_event.event = IW_CM_EVENT_ESTABLISHED;
    cm_event.status = 0;
    cm_event.provider_data = (void *)nesqp;
    cm_event.local_addr = cm_id->local_addr;
    cm_event.remote_addr = cm_id->remote_addr;
    cm_event.private_data = NULL;
    cm_event.private_data_len = 0;
    ret = cm_id->event_handler(cm_id, &cm_event);
    attr.qp_state = IB_QPS_RTS;
    nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
    if (cm_node->loopbackpartner) {
        cm_node->loopbackpartner->mpa_frame_size =
            nesqp->private_data_len;
        /* copy entire MPA frame to our cm_node's frame */
        memcpy(cm_node->loopbackpartner->mpa_frame_buf,
               conn_param->private_data, conn_param->private_data_len);
        create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
    }
    if (ret)
        printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
               "ret=%d\n", __func__, __LINE__, ret);

    return 0;
}


int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
{
    struct nes_cm_node *cm_node;
    struct nes_cm_node *loopback;
    struct nes_cm_core *cm_core;
    u8 *start_buff;

    atomic_inc(&cm_rejects);
    cm_node = (struct nes_cm_node *)cm_id->provider_data;
    loopback = cm_node->loopbackpartner;
    cm_core = cm_node->cm_core;
    cm_node->cm_id = cm_id;

    if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
        return -EINVAL;

    if (loopback) {
        memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
        loopback->mpa_frame.priv_data_len = pdata_len;
        loopback->mpa_frame_size = pdata_len;
    } else {
        start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
        cm_node->mpa_frame_size = pdata_len;
        memcpy(start_buff, pdata, pdata_len);
    }
    return cm_core->api->reject(cm_core, cm_node);
}


int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
    struct ib_qp *ibqp;
    struct nes_qp *nesqp;
    struct nes_vnic *nesvnic;
    struct nes_device *nesdev;
    struct nes_cm_node *cm_node;
    struct nes_cm_info cm_info;
    int apbvt_set = 0;

    ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
    if (!ibqp)
        return -EINVAL;
    nesqp = to_nesqp(ibqp);
    if (!nesqp)
        return -EINVAL;
    nesvnic = to_nesvnic(nesqp->ibqp.device);
    if (!nesvnic)
        return -EINVAL;
    nesdev = nesvnic->nesdev;
    if (!nesdev)
        return -EINVAL;

    if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
        return -EINVAL;

    nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
          "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
          ntohl(nesvnic->local_ipaddr),
          ntohl(cm_id->remote_addr.sin_addr.s_addr),
          ntohs(cm_id->remote_addr.sin_port),
          ntohl(cm_id->local_addr.sin_addr.s_addr),
          ntohs(cm_id->local_addr.sin_port));

    atomic_inc(&cm_connects);
    nesqp->active_conn = 1;

    /* cache the cm_id in the qp */
    nesqp->cm_id = cm_id;

    cm_id->provider_data = nesqp;

    nesqp->private_data_len = conn_param->private_data_len;
    nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
    /* space for rdma0 read msg */
    if (conn_param->ord == 0)
        nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(1);

    nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
    nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
          conn_param->private_data_len);

    if (cm_id->local_addr.sin_addr.s_addr !=
        cm_id->remote_addr.sin_addr.s_addr) {
        nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
                 PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
        apbvt_set = 1;
    }

    /* set up the connection params for the node */
    cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
    cm_info.loc_port = htons(cm_id->local_addr.sin_port);
    cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
    cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
    cm_info.cm_id = cm_id;
    cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;

    cm_id->add_ref(cm_id);

    /* create a connect CM node connection */
    cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
                      conn_param->private_data_len, (void *)conn_param->private_data,
                      &cm_info);
    if (!cm_node) {
        if (apbvt_set)
            nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
                     PCI_FUNC(nesdev->pcidev->devfn),
                     NES_MANAGE_APBVT_DEL);

        cm_id->rem_ref(cm_id);
        return -ENOMEM;
    }

    cm_node->apbvt_set = apbvt_set;
    nesqp->cm_node = cm_node;
    cm_node->nesqp = nesqp;
    nes_add_ref(&nesqp->ibqp);

    return 0;
}


int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
{
    struct nes_vnic *nesvnic;
    struct nes_cm_listener *cm_node;
    struct nes_cm_info cm_info;
    int err;

    nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
            cm_id, ntohs(cm_id->local_addr.sin_port));

    nesvnic = to_nesvnic(cm_id->device);
    if (!nesvnic)
        return -EINVAL;

    nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
            nesvnic, nesvnic->netdev, nesvnic->netdev->name);

    nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
            nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);

    /* setup listen params in our api call struct */
    cm_info.loc_addr = nesvnic->local_ipaddr;
    cm_info.loc_port = cm_id->local_addr.sin_port;
    cm_info.backlog = backlog;
    cm_info.cm_id = cm_id;

    cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;


    cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
    if (!cm_node) {
        printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
               __func__, __LINE__);
        return -ENOMEM;
    }

    cm_id->provider_data = cm_node;

    if (!cm_node->reused_node) {
        err = nes_manage_apbvt(nesvnic,
                       ntohs(cm_id->local_addr.sin_port),
                       PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
                       NES_MANAGE_APBVT_ADD);
        if (err) {
            printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
                   err);
            g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
            return err;
        }
        atomic_inc(&cm_listens_created);
    }

    cm_id->add_ref(cm_id);
    cm_id->provider_data = (void *)cm_node;


    return 0;
}


int nes_destroy_listen(struct iw_cm_id *cm_id)
{
    if (cm_id->provider_data)
        g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
    else
        nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");

    cm_id->rem_ref(cm_id);

    return 0;
}


int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
{
    int rc = 0;

    cm_packets_received++;
    if ((g_cm_core) && (g_cm_core->api))
        rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
    else
        nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
              " cm is not setup properly.\n");

    return rc;
}


int nes_cm_start(void)
{
    nes_debug(NES_DBG_CM, "\n");
    /* create the primary CM core, pass this handle to subsequent core inits */
    g_cm_core = nes_cm_alloc_core();
    if (g_cm_core)
        return 0;
    else
        return -ENOMEM;
}


int nes_cm_stop(void)
{
    g_cm_core->api->destroy_cm_core(g_cm_core);
    return 0;
}


static void cm_event_connected(struct nes_cm_event *event)
{
    struct nes_qp *nesqp;
    struct nes_vnic *nesvnic;
    struct nes_device *nesdev;
    struct nes_cm_node *cm_node;
    struct nes_adapter *nesadapter;
    struct ib_qp_attr attr;
    struct iw_cm_id *cm_id;
    struct iw_cm_event cm_event;
    struct nes_v4_quad nes_quad;
    u32 crc_value;
    int ret;

    /* get all our handles */
    cm_node = event->cm_node;
    cm_id = cm_node->cm_id;
    nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
    nesqp = (struct nes_qp *)cm_id->provider_data;
    nesvnic = to_nesvnic(nesqp->ibqp.device);
    nesdev = nesvnic->nesdev;
    nesadapter = nesdev->nesadapter;

    if (nesqp->destroyed)
        return;
    atomic_inc(&cm_connecteds);
    nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
          " local port 0x%04X. jiffies = %lu.\n",
          nesqp->hwqp.qp_id,
          ntohl(cm_id->remote_addr.sin_addr.s_addr),
          ntohs(cm_id->remote_addr.sin_port),
          ntohs(cm_id->local_addr.sin_port),
          jiffies);

    nes_cm_init_tsa_conn(nesqp, cm_node);

    /* set the QP tsa context */
    nesqp->nesqp_context->tcpPorts[0] =
        cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
    nesqp->nesqp_context->tcpPorts[1] =
        cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
    nesqp->nesqp_context->ip0 =
            cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));

    nesqp->nesqp_context->misc2 |= cpu_to_le32(
            (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
            NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
    nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
            nes_arp_table(nesdev,
            le32_to_cpu(nesqp->nesqp_context->ip0),
            NULL, NES_ARP_RESOLVE) << 16);
    nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
            jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
    nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
    nesqp->nesqp_context->ird_ord_sizes |=
            cpu_to_le32((u32)1 <<
            NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);

    /* Adjust tail for not having a LSMM */
    /*nesqp->hwqp.sq_tail = 1;*/

    build_rdma0_msg(cm_node, &nesqp);

    nes_write32(nesdev->regs + NES_WQE_ALLOC,
            (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);

    memset(&nes_quad, 0, sizeof(nes_quad));

    nes_quad.DstIpAdrIndex =
        cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
    nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
    nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
    nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;

    /* Produce hash key */
    crc_value = get_crc_value(&nes_quad);
    nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
    nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
          nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);

    nesqp->hte_index &= nesadapter->hte_index_mask;
    nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);

    nesqp->ietf_frame = &cm_node->mpa_frame;
    nesqp->private_data_len = (u8)cm_node->mpa_frame_size;
    cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);

    /* notify OF layer we successfully created the requested connection */
    cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
    cm_event.status = 0;
    cm_event.provider_data = cm_id->provider_data;
    cm_event.local_addr.sin_family = AF_INET;
    cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
    cm_event.remote_addr = cm_id->remote_addr;

    cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
    cm_event.private_data_len = (u8)event->cm_node->mpa_frame_size;
    cm_event.ird = cm_node->ird_size;
    cm_event.ord = cm_node->ord_size;

    cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
    ret = cm_id->event_handler(cm_id, &cm_event);
    nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);

    if (ret)
        printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
               "ret=%d\n", __func__, __LINE__, ret);
    attr.qp_state = IB_QPS_RTS;
    nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);

    nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
          "%lu\n", nesqp->hwqp.qp_id, jiffies);

    return;
}


static void cm_event_connect_error(struct nes_cm_event *event)
{
    struct nes_qp *nesqp;
    struct iw_cm_id *cm_id;
    struct iw_cm_event cm_event;
    /* struct nes_cm_info cm_info; */
    int ret;

    if (!event->cm_node)
        return;

    cm_id = event->cm_node->cm_id;
    if (!cm_id)
        return;

    nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
    nesqp = cm_id->provider_data;

    if (!nesqp)
        return;

    /* notify OF layer about this connection error event */
    /* cm_id->rem_ref(cm_id); */
    nesqp->cm_id = NULL;
    cm_id->provider_data = NULL;
    cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
    cm_event.status = -ECONNRESET;
    cm_event.provider_data = cm_id->provider_data;
    cm_event.local_addr = cm_id->local_addr;
    cm_event.remote_addr = cm_id->remote_addr;
    cm_event.private_data = NULL;
    cm_event.private_data_len = 0;

    nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
          "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
          cm_event.remote_addr.sin_addr.s_addr);

    ret = cm_id->event_handler(cm_id, &cm_event);
    nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
    if (ret)
        printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
               "ret=%d\n", __func__, __LINE__, ret);
    cm_id->rem_ref(cm_id);

    rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
    return;
}


static void cm_event_reset(struct nes_cm_event *event)
{
    struct nes_qp *nesqp;
    struct iw_cm_id *cm_id;
    struct iw_cm_event cm_event;
    /* struct nes_cm_info cm_info; */
    int ret;

    if (!event->cm_node)
        return;

    if (!event->cm_node->cm_id)
        return;

    cm_id = event->cm_node->cm_id;

    nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
    nesqp = cm_id->provider_data;
    if (!nesqp)
        return;

    nesqp->cm_id = NULL;
    /* cm_id->provider_data = NULL; */
    cm_event.event = IW_CM_EVENT_DISCONNECT;
    cm_event.status = -ECONNRESET;
    cm_event.provider_data = cm_id->provider_data;
    cm_event.local_addr = cm_id->local_addr;
    cm_event.remote_addr = cm_id->remote_addr;
    cm_event.private_data = NULL;
    cm_event.private_data_len = 0;

    cm_id->add_ref(cm_id);
    ret = cm_id->event_handler(cm_id, &cm_event);
    atomic_inc(&cm_closes);
    cm_event.event = IW_CM_EVENT_CLOSE;
    cm_event.status = 0;
    cm_event.provider_data = cm_id->provider_data;
    cm_event.local_addr = cm_id->local_addr;
    cm_event.remote_addr = cm_id->remote_addr;
    cm_event.private_data = NULL;
    cm_event.private_data_len = 0;
    nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
    ret = cm_id->event_handler(cm_id, &cm_event);

    nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);


    /* notify OF layer about this connection error event */
    cm_id->rem_ref(cm_id);

    return;
}


static void cm_event_mpa_req(struct nes_cm_event *event)
{
    struct iw_cm_id *cm_id;
    struct iw_cm_event cm_event;
    int ret;
    struct nes_cm_node *cm_node;

    cm_node = event->cm_node;
    if (!cm_node)
        return;
    cm_id = cm_node->cm_id;

    atomic_inc(&cm_connect_reqs);
    nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
          cm_node, cm_id, jiffies);

    cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
    cm_event.status = 0;
    cm_event.provider_data = (void *)cm_node;

    cm_event.local_addr.sin_family = AF_INET;
    cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
    cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);

    cm_event.remote_addr.sin_family = AF_INET;
    cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
    cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
    cm_event.private_data = cm_node->mpa_frame_buf;
    cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
    cm_event.ird = cm_node->ird_size;
    cm_event.ord = cm_node->ord_size;

    ret = cm_id->event_handler(cm_id, &cm_event);
    if (ret)
        printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
               __func__, __LINE__, ret);
    return;
}


static void cm_event_mpa_reject(struct nes_cm_event *event)
{
    struct iw_cm_id *cm_id;
    struct iw_cm_event cm_event;
    struct nes_cm_node *cm_node;
    int ret;

    cm_node = event->cm_node;
    if (!cm_node)
        return;
    cm_id = cm_node->cm_id;

    atomic_inc(&cm_connect_reqs);
    nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
          cm_node, cm_id, jiffies);

    cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
    cm_event.status = -ECONNREFUSED;
    cm_event.provider_data = cm_id->provider_data;

    cm_event.local_addr.sin_family = AF_INET;
    cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
    cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);

    cm_event.remote_addr.sin_family = AF_INET;
    cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
    cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);

    cm_event.private_data = cm_node->mpa_frame_buf;
    cm_event.private_data_len = (u8)cm_node->mpa_frame_size;

    nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
          "remove_addr=%08x\n",
          cm_event.local_addr.sin_addr.s_addr,
          cm_event.remote_addr.sin_addr.s_addr);

    ret = cm_id->event_handler(cm_id, &cm_event);
    if (ret)
        printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
               __func__, __LINE__, ret);

    return;
}


static void nes_cm_event_handler(struct work_struct *);

static int nes_cm_post_event(struct nes_cm_event *event)
{
    atomic_inc(&event->cm_node->cm_core->events_posted);
    add_ref_cm_node(event->cm_node);
    event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
    INIT_WORK(&event->event_work, nes_cm_event_handler);
    nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
          event->cm_node, event);

    queue_work(event->cm_node->cm_core->event_wq, &event->event_work);

    nes_debug(NES_DBG_CM, "Exit\n");
    return 0;
}


static void nes_cm_event_handler(struct work_struct *work)
{
    struct nes_cm_event *event = container_of(work, struct nes_cm_event,
                          event_work);
    struct nes_cm_core *cm_core;

    if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
        return;

    cm_core = event->cm_node->cm_core;
    nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
          event, event->type, atomic_read(&cm_core->events_posted));

    switch (event->type) {
    case NES_CM_EVENT_MPA_REQ:
        cm_event_mpa_req(event);
        nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
              event->cm_node);
        break;
    case NES_CM_EVENT_RESET:
        nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
              event->cm_node);
        cm_event_reset(event);
        break;
    case NES_CM_EVENT_CONNECTED:
        if ((!event->cm_node->cm_id) ||
            (event->cm_node->state != NES_CM_STATE_TSA))
            break;
        cm_event_connected(event);
        nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
        break;
    case NES_CM_EVENT_MPA_REJECT:
        if ((!event->cm_node->cm_id) ||
            (event->cm_node->state == NES_CM_STATE_TSA))
            break;
        cm_event_mpa_reject(event);
        nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
        break;

    case NES_CM_EVENT_ABORTED:
        if ((!event->cm_node->cm_id) ||
            (event->cm_node->state == NES_CM_STATE_TSA))
            break;
        cm_event_connect_error(event);
        nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
        break;
    case NES_CM_EVENT_DROPPED_PKT:
        nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
        break;
    default:
        nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
        break;
    }

    atomic_dec(&cm_core->events_posted);
    event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
    rem_ref_cm_node(cm_core, event->cm_node);
    kfree(event);

    return;
}