drivers/infiniband/hw/nes/nes_cm.c

/*
 * Copyright (c) 2006 - 2008 NetEffect, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */


#define TCPOPT_TIMESTAMP 8

#include <asm/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/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 <net/neighbour.h>
#include <net/route.h>
#include <net/ip_fib.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;
u32 cm_listens_created;
u32 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 add_ref_cm_node(struct nes_cm_node *);
static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);


/* 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
};

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;


/**
 * create_event
 */
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, "Created event=%p, type=%u, dst_addr=%08x[%x],"
			" src_addr=%08x[%x]\n",
			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;
}


/**
 * send_mpa_request
 */
int send_mpa_request(struct nes_cm_node *cm_node)
{
	struct sk_buff *skb;
	int ret;

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

	/* send an MPA Request frame */
	form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
			cm_node->mpa_frame_size, SET_ACK);

	ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
	if (ret < 0) {
		return ret;
	}

	return 0;
}


/**
 * recv_mpa - process a received TCP pkt, we are expecting an
 * IETF MPA frame
 */
static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 len)
{
	struct ietf_mpa_frame *mpa_frame;

	/* assume req frame is in tcp data payload */
	if (len < sizeof(struct ietf_mpa_frame)) {
		nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
		return -1;
	}

	mpa_frame = (struct ietf_mpa_frame *)buffer;
	cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);

	if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
		nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
				" complete (%x + %x != %x)\n",
				cm_node->mpa_frame_size, (u32)sizeof(struct ietf_mpa_frame), len);
		return -1;
	}

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

	return 0;
}


/**
 * handle_exception_pkt - process an exception packet.
 * We have been in a TSA state, and we have now received SW
 * TCP/IP traffic should be a FIN request or IP pkt with options
 */
static int handle_exception_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb)
{
	int ret = 0;
	struct tcphdr *tcph = tcp_hdr(skb);

	/* first check to see if this a FIN pkt */
	if (tcph->fin) {
		/* we need to ACK the FIN request */
		send_ack(cm_node);

		/* check which side we are (client/server) and set next state accordingly */
		if (cm_node->tcp_cntxt.client)
			cm_node->state = NES_CM_STATE_CLOSING;
		else {
			/* we are the server side */
			cm_node->state = NES_CM_STATE_CLOSE_WAIT;
			/* since this is a self contained CM we don't wait for */
			/* an APP to close us, just send final FIN immediately */
			ret = send_fin(cm_node, NULL);
			cm_node->state = NES_CM_STATE_LAST_ACK;
		}
	} else {
		ret = -EINVAL;
	}

	return ret;
}


/**
 * form_cm_frame - get a free packet and build empty frame Use
 * node info to build.
 */
struct sk_buff *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;

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

	skb->len = 0;
	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;
	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;	/* data (no headers) */

	if (flags & SET_FIN)
		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++;

	return skb;
}


/**
 * print_core - dump a cm core
 */
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, "Session ID    : %u \n", atomic_read(&core->session_id));

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

	nes_debug(NES_DBG_CM, "Tx Free cnt   : %u \n", skb_queue_len(&core->tx_free_list));
	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");
}


/**
 * schedule_nes_timer
 * note - cm_node needs to be protected before calling this. Encase in:
 *			rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 */
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;
	struct nes_timer_entry *new_send;
	int ret = 0;
	u32 was_timer_set;

	if (!cm_node)
		return -EINVAL;
	new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
	if (!new_send)
		return -1;

	/* 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/2);	/* TODO: decide on the correct value here */
		spin_lock_irqsave(&cm_node->recv_list_lock, flags);
		list_add_tail(&new_send->list, &cm_node->recv_list);
		spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
	}

	if (type == NES_TIMER_TYPE_SEND) {
		new_send->seq_num = htonl(tcp_hdr(skb)->seq);
		atomic_inc(&new_send->skb->users);

		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);
			atomic_dec(&new_send->skb->users);
			new_send->timetosend = jiffies;
		} else {
			cm_packets_sent++;
			if (!send_retrans) {
				if (close_when_complete)
					rem_ref_cm_node(cm_node->cm_core, cm_node);
				dev_kfree_skb_any(new_send->skb);
				kfree(new_send);
				return ret;
			}
			new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
		}
		spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
		list_add_tail(&new_send->list, &cm_node->retrans_list);
		spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
	}
	if (type == NES_TIMER_TYPE_RECV) {
		new_send->seq_num = htonl(tcp_hdr(skb)->seq);
		new_send->timetosend = jiffies;
		spin_lock_irqsave(&cm_node->recv_list_lock, flags);
		list_add_tail(&new_send->list, &cm_node->recv_list);
		spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
	}
	cm_core = cm_node->cm_core;

	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;
}


/**
 * nes_cm_timer_tick
 */
void nes_cm_timer_tick(unsigned long pass)
{
	unsigned long flags, qplockflags;
	unsigned long nexttimeout = jiffies + NES_LONG_TIME;
	struct iw_cm_id *cm_id;
	struct nes_cm_node *cm_node;
	struct nes_timer_entry *send_entry, *recv_entry;
	struct list_head *list_core, *list_core_temp;
	struct list_head *list_node, *list_node_temp;
	struct nes_cm_core *cm_core = g_cm_core;
	struct nes_qp *nesqp;
	struct sk_buff *skb;
	u32 settimer = 0;
	int ret = NETDEV_TX_OK;
	int    node_done;

	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);
		add_ref_cm_node(cm_node);
		spin_unlock_irqrestore(&cm_core->ht_lock, flags);
		spin_lock_irqsave(&cm_node->recv_list_lock, flags);
		list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
			recv_entry = container_of(list_core, struct nes_timer_entry, list);
			if ((time_after(recv_entry->timetosend, jiffies)) &&
					(recv_entry->type == NES_TIMER_TYPE_CLOSE)) {
				if (nexttimeout > recv_entry->timetosend || !settimer) {
					nexttimeout = recv_entry->timetosend;
					settimer = 1;
				}
				continue;
			}
			list_del(&recv_entry->list);
			cm_id = cm_node->cm_id;
			spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
			if (recv_entry->type == NES_TIMER_TYPE_CLOSE) {
				nesqp = (struct nes_qp *)recv_entry->skb;
				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));
					nes_rem_ref(&nesqp->ibqp);
				}
				if (cm_id)
					cm_id->rem_ref(cm_id);
			}
			kfree(recv_entry);
			spin_lock_irqsave(&cm_node->recv_list_lock, flags);
		}
		spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);

		spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
		node_done = 0;
		list_for_each_safe(list_core, list_node_temp, &cm_node->retrans_list) {
			if (node_done) {
				break;
			}
			send_entry = container_of(list_core, struct nes_timer_entry, list);
			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;
					}
					node_done = 1;
					continue;
				} else {
					list_del(&send_entry->list);
					skb = send_entry->skb;
					spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
					dev_kfree_skb_any(skb);
					kfree(send_entry);
					spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
					continue;
				}
			}
			if (send_entry->type == NES_TIMER_NODE_CLEANUP) {
				list_del(&send_entry->list);
				spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
				kfree(send_entry);
				spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
				continue;
			}
			if ((send_entry->seq_num < cm_node->tcp_cntxt.rem_ack_num) ||
					(cm_node->state == NES_CM_STATE_TSA) ||
					(cm_node->state == NES_CM_STATE_CLOSED)) {
				skb = send_entry->skb;
				list_del(&send_entry->list);
				spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
				kfree(send_entry);
				dev_kfree_skb_any(skb);
				spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
				continue;
			}

			if (!send_entry->retranscount || !send_entry->retrycount) {
				cm_packets_dropped++;
				skb = send_entry->skb;
				list_del(&send_entry->list);
				spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
				dev_kfree_skb_any(skb);
				kfree(send_entry);
				if (cm_node->state == NES_CM_STATE_SYN_RCVD) {
					/* this node never even generated an indication up to the cm */
					rem_ref_cm_node(cm_core, cm_node);
				} else {
					cm_node->state = NES_CM_STATE_CLOSED;
					create_event(cm_node, NES_CM_EVENT_ABORTED);
				}
				spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
				continue;
			}
			/* this seems like the correct place, but leave send entry unprotected */
			// spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
			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);
			if (ret != NETDEV_TX_OK) {
				cm_packets_bounced++;
				atomic_dec(&send_entry->skb->users);
				send_entry->retrycount--;
				nexttimeout = jiffies + NES_SHORT_TIME;
				settimer = 1;
				node_done = 1;
				spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
				continue;
			} else {
				cm_packets_sent++;
			}
			spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
			list_del(&send_entry->list);
			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--;
				send_entry->timetosend = jiffies + NES_RETRY_TIMEOUT;
				if (nexttimeout > send_entry->timetosend || !settimer) {
					nexttimeout = send_entry->timetosend;
					settimer = 1;
				}
				list_add(&send_entry->list, &cm_node->retrans_list);
				continue;
			} else {
				int close_when_complete;
				skb = send_entry->skb;
				close_when_complete = send_entry->close_when_complete;
				spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
				if (close_when_complete) {
					BUG_ON(atomic_read(&cm_node->ref_count) == 1);
					rem_ref_cm_node(cm_core, cm_node);
				}
				dev_kfree_skb_any(skb);
				kfree(send_entry);
				spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
				continue;
			}
		}
		spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);

		rem_ref_cm_node(cm_core, cm_node);

		spin_lock_irqsave(&cm_core->ht_lock, flags);
		if (ret != NETDEV_TX_OK)
			break;
	}
	spin_unlock_irqrestore(&cm_core->ht_lock, flags);

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


/**
 * send_syn
 */
int send_syn(struct nes_cm_node *cm_node, u32 sendack)
{
	int ret;
	int flags = SET_SYN;
	struct sk_buff *skb;
	char optionsbuffer[sizeof(struct option_mss) +
			sizeof(struct option_windowscale) +
			sizeof(struct option_base) + 1];

	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;

	skb = get_free_pkt(cm_node);
	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;
}


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

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

	add_ref_cm_node(cm_node);
	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;
}


/**
 * send_ack
 */
int send_ack(struct nes_cm_node *cm_node)
{
	int ret;
	struct sk_buff *skb = get_free_pkt(cm_node);

	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;
}


/**
 * send_fin
 */
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 = get_free_pkt(cm_node);

	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;
}


/**
 * get_free_pkt
 */
struct sk_buff *get_free_pkt(struct nes_cm_node *cm_node)
{
	struct sk_buff *skb, *new_skb;

	/* check to see if we need to repopulate the free tx pkt queue */
	if (skb_queue_len(&cm_node->cm_core->tx_free_list) < NES_CM_FREE_PKT_LO_WATERMARK) {
		while (skb_queue_len(&cm_node->cm_core->tx_free_list) <
				cm_node->cm_core->free_tx_pkt_max) {
			/* replace the frame we took, we won't get it back */
			new_skb = dev_alloc_skb(cm_node->cm_core->mtu);
			BUG_ON(!new_skb);
			/* add a replacement frame to the free tx list head */
			skb_queue_head(&cm_node->cm_core->tx_free_list, new_skb);
		}
	}

	skb = skb_dequeue(&cm_node->cm_core->tx_free_list);

	return skb;
}


/**
 * make_hashkey - generate hash key from node tuple
 */
static inline int make_hashkey(u16 loc_port, nes_addr_t loc_addr, u16 rem_port,
		nes_addr_t rem_addr)
{
	u32 hashkey = 0;

	hashkey = loc_addr + rem_addr + loc_port + rem_port;
	hashkey = (hashkey % NES_CM_HASHTABLE_SIZE);

	return hashkey;
}


/**
 * find_node - find a cm node that matches the reference cm node
 */
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;
	u32 hashkey;
	struct list_head *list_pos;
	struct list_head *hte;
	struct nes_cm_node *cm_node;

	/* make a hash index key for this packet */
	hashkey = make_hashkey(loc_port, loc_addr, rem_port, rem_addr);

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

	nes_debug(NES_DBG_CM, "Searching for an owner node:%x:%x from core %p->%p\n",
			loc_addr, loc_port, cm_core, hte);

	/* walk list and find cm_node associated with this session ID */
	spin_lock_irqsave(&cm_core->ht_lock, flags);
	list_for_each(list_pos, hte) {
		cm_node = container_of(list_pos, struct nes_cm_node, 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;
}


/**
 * find_listener - find a cm node listening on this addr-port pair
 */
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 list_head *listen_list;
	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(listen_list, &cm_core->listen_list.list) {
		listen_node = container_of(listen_list, struct nes_cm_listener, 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);

	nes_debug(NES_DBG_CM, "Unable to find listener- %x:%x\n",
			dst_addr, dst_port);

	/* no listener */
	return NULL;
}


/**
 * add_hte_node - add a cm node to the hash table
 */
static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
{
	unsigned long flags;
	u32 hashkey;
	struct list_head *hte;

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

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

	/* first, make an index into our hash table */
	hashkey = make_hashkey(cm_node->loc_port, cm_node->loc_addr,
			cm_node->rem_port, cm_node->rem_addr);
	cm_node->hashkey = hashkey;

	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;
}


/**
 * mini_cm_dec_refcnt_listen
 */
static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
		struct nes_cm_listener *listener, int free_hanging_nodes)
{
	int ret = 1;
	unsigned long flags;
	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;
		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;
}


/**
 * mini_cm_del_listen
 */
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);
}


/**
 * mini_cm_accelerated
 */
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);
		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;
}


/**
 * nes_addr_send_arp
 */
static void nes_addr_send_arp(u32 dst_ip)
{
	struct rtable *rt;
	struct flowi fl;

	memset(&fl, 0, sizeof fl);
	fl.nl_u.ip4_u.daddr = htonl(dst_ip);
	if (ip_route_output_key(&init_net, &rt, &fl)) {
		printk("%s: ip_route_output_key failed for 0x%08X\n",
				__FUNCTION__, dst_ip);
		return;
	}

	neigh_event_send(rt->u.dst.neighbour, NULL);
	ip_rt_put(rt);
}


/**
 * make_cm_node - create a new instance of a cm node
 */
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 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->send_write0 = send_first;
	nes_debug(NES_DBG_CM, "Make node addresses : loc = %x:%x, rem = %x:%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);

	INIT_LIST_HEAD(&cm_node->retrans_list);
	spin_lock_init(&cm_node->retrans_list_lock);
	INIT_LIST_HEAD(&cm_node->recv_list);
	spin_lock_init(&cm_node->recv_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;
	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);
	atomic_inc(&cm_core->session_id);
	cm_node->session_id = (u32)(atomic_read(&cm_core->session_id) + current->tgid);
	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 */
	arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
	if (arpindex < 0) {
		kfree(cm_node);
		nes_addr_send_arp(cm_info->rem_addr);
		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:%02x,"
			" %02x, %02x, %02x, %02x, %02x\n",
			cm_node->rem_mac[0], cm_node->rem_mac[1],
			cm_node->rem_mac[2], cm_node->rem_mac[3],
			cm_node->rem_mac[4], cm_node->rem_mac[5]);

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

	return cm_node;
}


/**
 * add_ref_cm_node - destroy an instance of a cm node
 */
static int add_ref_cm_node(struct nes_cm_node *cm_node)
{
	atomic_inc(&cm_node->ref_count);
	return 0;
}


/**
 * rem_ref_cm_node - destroy an instance of a cm node
 */
static int rem_ref_cm_node(struct nes_cm_core *cm_core,
		struct nes_cm_node *cm_node)
{
	unsigned long flags, qplockflags;
	struct nes_timer_entry *send_entry;
	struct nes_timer_entry *recv_entry;
	struct iw_cm_id *cm_id;
	struct list_head *list_core, *list_node_temp;
	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);
	}

	spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
	list_for_each_safe(list_core, list_node_temp, &cm_node->retrans_list) {
		send_entry = container_of(list_core, struct nes_timer_entry, list);
		list_del(&send_entry->list);
		spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
		dev_kfree_skb_any(send_entry->skb);
		kfree(send_entry);
		spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
		continue;
	}
	spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);

	spin_lock_irqsave(&cm_node->recv_list_lock, flags);
	list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
		recv_entry = container_of(list_core, struct nes_timer_entry, list);
		list_del(&recv_entry->list);
		cm_id = cm_node->cm_id;
		spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
		if (recv_entry->type == NES_TIMER_TYPE_CLOSE) {
			nesqp = (struct nes_qp *)recv_entry->skb;
			spin_lock_irqsave(&nesqp->lock, qplockflags);
			if (nesqp->cm_id) {
				nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: ****** HIT A NES_TIMER_TYPE_CLOSE"
						" with something to do!!! ******\n",
						nesqp->hwqp.qp_id, cm_id);
				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: ****** HIT A NES_TIMER_TYPE_CLOSE"
						" with nothing to do!!! ******\n",
						nesqp->hwqp.qp_id, cm_id);
				nes_rem_ref(&nesqp->ibqp);
			}
			cm_id->rem_ref(cm_id);
		} else if (recv_entry->type == NES_TIMER_TYPE_RECV) {
			dev_kfree_skb_any(recv_entry->skb);
		}
		kfree(recv_entry);
		spin_lock_irqsave(&cm_node->recv_list_lock, flags);
	}
	spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);

	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);
		}
	}

	kfree(cm_node);
	atomic_dec(&cm_core->node_cnt);
	atomic_inc(&cm_nodes_destroyed);

	return 0;
}


/**
 * process_options
 */
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",
						__FUNCTION__,
						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;
			case OPTION_NUMBER_WRITE0:
				cm_node->send_write0 = 1;
				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;
}


/**
 * process_packet
 */
int process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
		struct nes_cm_core *cm_core)
{
	int optionsize;
	int datasize;
	int ret = 0;
	struct tcphdr *tcph = tcp_hdr(skb);
	u32 inc_sequence;
	if (cm_node->state == NES_CM_STATE_SYN_SENT && tcph->syn) {
		inc_sequence = ntohl(tcph->seq);
		cm_node->tcp_cntxt.rcv_nxt = inc_sequence;
	}

	if ((!tcph) || (cm_node->state == NES_CM_STATE_TSA)) {
		BUG_ON(!tcph);
		atomic_inc(&cm_accel_dropped_pkts);
		return -1;
	}

	if (tcph->rst) {
		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));
		switch (cm_node->state) {
			case NES_CM_STATE_LISTENING:
				rem_ref_cm_node(cm_core, cm_node);
				break;
			case NES_CM_STATE_TSA:
			case NES_CM_STATE_CLOSED:
				break;
			case NES_CM_STATE_SYN_RCVD:
					nes_debug(NES_DBG_CM, "Received a reset for local 0x%08X:%04X,"
							" remote 0x%08X:%04X, node state = %u\n",
							cm_node->loc_addr, cm_node->loc_port,
							cm_node->rem_addr, cm_node->rem_port,
							cm_node->state);
				rem_ref_cm_node(cm_core, cm_node);
				break;
			case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
			case NES_CM_STATE_ESTABLISHED:
			case NES_CM_STATE_MPAREQ_SENT:
			default:
					nes_debug(NES_DBG_CM, "Received a reset for local 0x%08X:%04X,"
							" remote 0x%08X:%04X, node state = %u refcnt=%d\n",
							cm_node->loc_addr, cm_node->loc_port,
							cm_node->rem_addr, cm_node->rem_port,
							cm_node->state, atomic_read(&cm_node->ref_count));
				// create event
				cm_node->state = NES_CM_STATE_CLOSED;

				create_event(cm_node, NES_CM_EVENT_ABORTED);
				break;

		}
		return -1;
	}

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

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

	datasize = skb->len;
	inc_sequence = ntohl(tcph->seq);
	nes_debug(NES_DBG_CM, "datasize = %u, sequence = 0x%08X, ack_seq = 0x%08X,"
			" rcv_nxt = 0x%08X Flags: %s %s.\n",
			datasize, inc_sequence, ntohl(tcph->ack_seq),
			cm_node->tcp_cntxt.rcv_nxt, (tcph->syn ? "SYN":""),
			(tcph->ack ? "ACK":""));

	if (!tcph->syn && (inc_sequence != cm_node->tcp_cntxt.rcv_nxt)
		) {
		nes_debug(NES_DBG_CM, "dropping packet, datasize = %u, sequence = 0x%08X,"
				" ack_seq = 0x%08X, rcv_nxt = 0x%08X Flags: %s.\n",
				datasize, inc_sequence, ntohl(tcph->ack_seq),
				cm_node->tcp_cntxt.rcv_nxt, (tcph->ack ? "ACK":""));
		if (cm_node->state == NES_CM_STATE_LISTENING) {
			rem_ref_cm_node(cm_core, cm_node);
		}
		return -1;
	}

		cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;


	if (optionsize) {
		u8 *optionsloc = (u8 *)&tcph[1];
		if (process_options(cm_node, optionsloc, optionsize, (u32)tcph->syn)) {
			nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n", __FUNCTION__, cm_node);
			send_reset(cm_node);
			if (cm_node->state != NES_CM_STATE_SYN_SENT)
			rem_ref_cm_node(cm_core, cm_node);
			return 0;
		}
	} else if (tcph->syn)
		cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;

	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;
	}

	if (tcph->ack) {
		cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
		switch (cm_node->state) {
			case NES_CM_STATE_SYN_RCVD:
			case NES_CM_STATE_SYN_SENT:
				/* read and stash current sequence number */
				if (cm_node->tcp_cntxt.rem_ack_num != cm_node->tcp_cntxt.loc_seq_num) {
					nes_debug(NES_DBG_CM, "ERROR - cm_node->tcp_cntxt.rem_ack_num !="
							" cm_node->tcp_cntxt.loc_seq_num\n");
					send_reset(cm_node);
					return 0;
				}
				if (cm_node->state == NES_CM_STATE_SYN_SENT)
					cm_node->state = NES_CM_STATE_ONE_SIDE_ESTABLISHED;
				else {
						cm_node->state = NES_CM_STATE_ESTABLISHED;
				}
				break;
			case NES_CM_STATE_LAST_ACK:
				cm_node->state = NES_CM_STATE_CLOSED;
				break;
			case NES_CM_STATE_FIN_WAIT1:
				cm_node->state = NES_CM_STATE_FIN_WAIT2;
				break;
			case NES_CM_STATE_CLOSING:
				cm_node->state = NES_CM_STATE_TIME_WAIT;
				/* need to schedule this to happen in 2MSL timeouts */
				cm_node->state = NES_CM_STATE_CLOSED;
				break;
			case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
			case NES_CM_STATE_ESTABLISHED:
			case NES_CM_STATE_MPAREQ_SENT:
			case NES_CM_STATE_CLOSE_WAIT:
			case NES_CM_STATE_TIME_WAIT:
			case NES_CM_STATE_CLOSED:
				break;
			case NES_CM_STATE_LISTENING:
				nes_debug(NES_DBG_CM, "Received an ACK on a listening port (SYN %d)\n", tcph->syn);
				cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
				send_reset(cm_node);
				/* send_reset bumps refcount, this should have been a new node */
				rem_ref_cm_node(cm_core, cm_node);
				return -1;
				break;
			case NES_CM_STATE_TSA:
				nes_debug(NES_DBG_CM, "Received a packet with the ack bit set while in TSA state\n");
				break;
			case NES_CM_STATE_UNKNOWN:
			case NES_CM_STATE_INITED:
			case NES_CM_STATE_ACCEPTING:
			case NES_CM_STATE_FIN_WAIT2:
			default:
				nes_debug(NES_DBG_CM, "Received ack from unknown state: %x\n",
						cm_node->state);
				send_reset(cm_node);
				break;
		}
	}

	if (tcph->syn) {
		if (cm_node->state == NES_CM_STATE_LISTENING) {
			/* do not exceed backlog */
			atomic_inc(&cm_node->listener->pend_accepts_cnt);
			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++;
				atomic_dec(&cm_node->listener->pend_accepts_cnt);
				rem_ref_cm_node(cm_core, cm_node);
				return 0;
			}
			cm_node->accept_pend = 1;

		}
		if (datasize == 0)
			cm_node->tcp_cntxt.rcv_nxt ++;

		if (cm_node->state == NES_CM_STATE_LISTENING) {
			cm_node->state = NES_CM_STATE_SYN_RCVD;
			send_syn(cm_node, 1);
		}
		if (cm_node->state == NES_CM_STATE_ONE_SIDE_ESTABLISHED) {
			cm_node->state = NES_CM_STATE_ESTABLISHED;
			/* send final handshake ACK */
			ret = send_ack(cm_node);
			if (ret < 0)
				return ret;

				cm_node->state = NES_CM_STATE_MPAREQ_SENT;
				ret = send_mpa_request(cm_node);
				if (ret < 0)
					return ret;
		}
	}

	if (tcph->fin) {
		cm_node->tcp_cntxt.rcv_nxt++;
		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:
				cm_node->state = NES_CM_STATE_CLOSE_WAIT;
				cm_node->state = NES_CM_STATE_LAST_ACK;
				ret = send_fin(cm_node, NULL);
				break;
			case NES_CM_STATE_FIN_WAIT1:
				cm_node->state = NES_CM_STATE_CLOSING;
				ret = send_ack(cm_node);
				break;
			case NES_CM_STATE_FIN_WAIT2:
				cm_node->state = NES_CM_STATE_TIME_WAIT;
				cm_node->tcp_cntxt.loc_seq_num ++;
				ret = send_ack(cm_node);
				/* need to schedule this to happen in 2MSL timeouts */
				cm_node->state = NES_CM_STATE_CLOSED;
				break;
			case NES_CM_STATE_CLOSE_WAIT:
			case NES_CM_STATE_LAST_ACK:
			case NES_CM_STATE_CLOSING:
			case NES_CM_STATE_TSA:
			default:
				nes_debug(NES_DBG_CM, "Received a fin while in %x state\n",
						cm_node->state);
				ret = -EINVAL;
				break;
		}
	}

	if (datasize) {
		u8 *dataloc = skb->data;
		/* figure out what state we are in and handle transition to next state */
		switch (cm_node->state) {
			case NES_CM_STATE_LISTENING:
			case NES_CM_STATE_SYN_RCVD:
			case NES_CM_STATE_SYN_SENT:
			case NES_CM_STATE_FIN_WAIT1:
			case NES_CM_STATE_FIN_WAIT2:
			case NES_CM_STATE_CLOSE_WAIT:
			case NES_CM_STATE_LAST_ACK:
			case NES_CM_STATE_CLOSING:
				break;
			case  NES_CM_STATE_MPAREQ_SENT:
				/* recv the mpa res frame, ret=frame len (incl priv data) */
				ret = parse_mpa(cm_node, dataloc, datasize);
				if (ret < 0)
					break;
				/* set the req frame payload len in skb */
				/* we are done handling this state, set node to a TSA state */
				cm_node->state = NES_CM_STATE_TSA;
				send_ack(cm_node);
				create_event(cm_node, NES_CM_EVENT_CONNECTED);
				break;

			case  NES_CM_STATE_ESTABLISHED:
				/* we are expecting an MPA req frame */
				ret = parse_mpa(cm_node, dataloc, datasize);
				if (ret < 0) {
					break;
				}
				cm_node->state = NES_CM_STATE_TSA;
				send_ack(cm_node);
				/* we got a valid MPA request, create an event */
				create_event(cm_node, NES_CM_EVENT_MPA_REQ);
				break;
			case  NES_CM_STATE_TSA:
				handle_exception_pkt(cm_node, skb);
				break;
			case NES_CM_STATE_UNKNOWN:
			case NES_CM_STATE_INITED:
			default:
				ret = -1;
		}
	}

	return ret;
}


/**
 * mini_cm_listen - create a listen node with params
 */
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;
		}

		memset(listener, 0, sizeof(struct nes_cm_listener));
		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);
	atomic_inc(&cm_core->session_id);

	listener->session_id = (u32)(atomic_read(&cm_core->session_id) + current->tgid);
	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;
}


/**
 * mini_cm_connect - make a connection node with params
 */
struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
		struct nes_vnic *nesvnic, struct ietf_mpa_frame *mpa_frame,
		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;

	u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) +
			ntohs(mpa_frame->priv_data_len);

	cm_info->loc_addr = htonl(cm_info->loc_addr);
	cm_info->rem_addr = htonl(cm_info->rem_addr);
	cm_info->loc_port = htons(cm_info->loc_port);
	cm_info->rem_port = htons(cm_info->rem_port);

	/* 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, cm_node->rem_addr,
				cm_node->rem_port, NES_CM_LISTENER_ACTIVE_STATE);
		if (loopbackremotelistener == NULL) {
			create_event(cm_node, NES_CM_EVENT_ABORTED);
		} else {
			atomic_inc(&cm_loopbacks);
			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);
			loopbackremotenode->loopbackpartner = cm_node;
			loopbackremotenode->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
			cm_node->loopbackpartner = loopbackremotenode;
			memcpy(loopbackremotenode->mpa_frame_buf, &mpa_frame->priv_data,
					mpa_frame_size);
			loopbackremotenode->mpa_frame_size = mpa_frame_size -
					sizeof(struct ietf_mpa_frame);

			// 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;

			create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
		}
		return cm_node;
	}

	/* set our node side to client (active) side */
	cm_node->tcp_cntxt.client = 1;
	/* init our MPA frame ptr */
	memcpy(&cm_node->mpa_frame, mpa_frame, mpa_frame_size);
	cm_node->mpa_frame_size = mpa_frame_size;

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

	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;
}


/**
 * mini_cm_accept - accept a connection
 * This function is never called
 */
int mini_cm_accept(struct nes_cm_core *cm_core, struct ietf_mpa_frame *mpa_frame,
		struct nes_cm_node *cm_node)
{
	return 0;
}


/**
 * mini_cm_reject - reject and teardown a connection
 */
int mini_cm_reject(struct nes_cm_core *cm_core,
		struct ietf_mpa_frame *mpa_frame,
		struct nes_cm_node *cm_node)
{
	int ret = 0;
	struct sk_buff *skb;
	u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) +
			ntohs(mpa_frame->priv_data_len);

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

	/* send an MPA Request frame */
	form_cm_frame(skb, cm_node, NULL, 0, mpa_frame, mpa_frame_size, SET_ACK | SET_FIN);
	ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);

	cm_node->state = NES_CM_STATE_CLOSED;
	ret = send_fin(cm_node, NULL);

	if (ret < 0) {
		printk(KERN_INFO PFX "failed to send MPA Reply (reject)\n");
		return ret;
	}

	return ret;
}


/**
 * mini_cm_close
 */
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) {
		/* if passed in node is null, create a reference key node for node search */
		/* check if we found an owner node for this pkt */
		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:
			cm_node->state = NES_CM_STATE_FIN_WAIT1;
			send_fin(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:
		case NES_CM_STATE_UNKNOWN:
		case NES_CM_STATE_INITED:
		case NES_CM_STATE_CLOSED:
		case NES_CM_STATE_TSA:
			ret = rem_ref_cm_node(cm_core, cm_node);
			break;
	}
	cm_node->cm_id = NULL;
	return ret;
}


/**
 * recv_pkt - recv an ETHERNET packet, and process it through CM
 * node state machine
 */
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 ret = 0;

	if (!skb || skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
		ret = -EINVAL;
		goto out;
	}

	iph = (struct iphdr *)skb->data;
	tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
	skb_reset_network_header(skb);
	skb_set_transport_header(skb, sizeof(*tcph));
	skb->len = ntohs(iph->tot_len);

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

	nes_debug(NES_DBG_CM, "Received packet: dest=0x%08X:0x%04X src=0x%08X:0x%04X\n",
			iph->daddr, tcph->dest, iph->saddr, tcph->source);

	/* note: this call is going to increment cm_node ref count */
	cm_node = find_node(cm_core,
			nfo.rem_port, nfo.rem_addr,
			nfo.loc_port, nfo.loc_addr);

	if (!cm_node) {
		listener = find_listener(cm_core, nfo.loc_addr, nfo.loc_port,
				NES_CM_LISTENER_ACTIVE_STATE);
		if (listener) {
			nfo.cm_id = listener->cm_id;
			nfo.conn_type = listener->conn_type;
		} else {
			nfo.cm_id = NULL;
			nfo.conn_type = 0;
		}

		cm_node = make_cm_node(cm_core, nesvnic, &nfo, listener);
		if (!cm_node) {
			nes_debug(NES_DBG_CM, "Unable to allocate node\n");
			if (listener) {
				nes_debug(NES_DBG_CM, "unable to allocate node and decrementing listener refcount\n");
				atomic_dec(&listener->ref_count);
			}
			ret = -1;
			goto out;
		}
		if (!listener) {
			nes_debug(NES_DBG_CM, "Packet found for unknown port %x refcnt=%d\n",
					nfo.loc_port, atomic_read(&cm_node->ref_count));
			if (!tcph->rst) {
				nes_debug(NES_DBG_CM, "Packet found for unknown port=%d"
						" rem_port=%d refcnt=%d\n",
						nfo.loc_port, nfo.rem_port, atomic_read(&cm_node->ref_count));

				cm_node->tcp_cntxt.rcv_nxt = ntohl(tcph->seq);
				cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
				send_reset(cm_node);
			}
			rem_ref_cm_node(cm_core, cm_node);
			ret = -1;
			goto out;
		}
		add_ref_cm_node(cm_node);
		cm_node->state = NES_CM_STATE_LISTENING;
	}

	nes_debug(NES_DBG_CM, "Processing Packet for node %p, data = (%p):\n",
			cm_node, skb->data);
	process_packet(cm_node, skb, cm_core);

	rem_ref_cm_node(cm_core, cm_node);
	out:
	if (skb)
		dev_kfree_skb_any(skb);
	return ret;
}


/**
 * nes_cm_alloc_core - allocate a top level instance of a cm core
 */
struct nes_cm_core *nes_cm_alloc_core(void)
{
	int i;

	struct nes_cm_core *cm_core;
	struct sk_buff *skb = NULL;

	/* 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->session_id, 0);
	atomic_set(&cm_core->events_posted, 0);

	/* init the packet lists */
	skb_queue_head_init(&cm_core->tx_free_list);

	for (i = 0; i < NES_CM_DEFAULT_FRAME_CNT; i++) {
		skb = dev_alloc_skb(cm_core->mtu);
		if (!skb) {
			kfree(cm_core);
			return NULL;
		}
		/* add 'raw' skb to free frame list */
		skb_queue_head(&cm_core->tx_free_list, skb);
	}

	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;
}


/**
 * mini_cm_dealloc_core - deallocate a top level instance of a cm core
 */
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;
}


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


/**
 * mini_cm_set
 */
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;
}


/**
 * nes_cm_init_tsa_conn setup HW; MPA frames must be
 * successfully exchanged when this is called
 */
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;
}


/**
 * nes_cm_disconn
 */
int nes_cm_disconn(struct nes_qp *nesqp)
{
	unsigned long flags;

	spin_lock_irqsave(&nesqp->lock, flags);
	if (nesqp->disconn_pending == 0) {
		nesqp->disconn_pending++;
		spin_unlock_irqrestore(&nesqp->lock, flags);
		/* nes_add_ref(&nesqp->ibqp); */
		/* init our disconnect work element, to */
		INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);

		queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
	} else {
		spin_unlock_irqrestore(&nesqp->lock, flags);
		nes_rem_ref(&nesqp->ibqp);
	}

	return 0;
}


/**
 * nes_disconnect_worker
 */
void nes_disconnect_worker(struct work_struct *work)
{
	struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);

	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_cm_disconn_true
 */
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;
	u8 issued_disconnect_reset = 0;

	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);
		nes_rem_ref(&nesqp->ibqp);
		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;


	nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);

	if ((nesqp->cm_id) && (cm_id->event_handler)) {
		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))) {
			atomic_inc(&cm_disconnects);
			cm_event.event = IW_CM_EVENT_DISCONNECT;
			if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
				issued_disconnect_reset = 1;
				cm_event.status = IW_CM_EVENT_STATUS_RESET;
				nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event (status reset) for "
						" QP%u, cm_id = %p. \n",
						nesqp->hwqp.qp_id, cm_id);
			} else {
				cm_event.status = IW_CM_EVENT_STATUS_OK;
			}

			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));

			spin_unlock_irqrestore(&nesqp->lock, flags);
			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);
			spin_lock_irqsave(&nesqp->lock, flags);
		}

		nesqp->disconn_pending = 0;
		/* There might have been another AE while the lock was released */
		original_hw_tcp_state = nesqp->hw_tcp_state;
		original_ibqp_state   = nesqp->ibqp_state;
		last_ae = nesqp->last_aeq;

		if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
				((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))) {
			atomic_inc(&cm_closes);
			nesqp->cm_id = NULL;
			nesqp->in_disconnect = 0;
			spin_unlock_irqrestore(&nesqp->lock, flags);
			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 = IW_CM_EVENT_STATUS_OK;
			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);

			spin_lock_irqsave(&nesqp->lock, flags);
			if (nesqp->flush_issued == 0) {
				nesqp->flush_issued = 1;
				spin_unlock_irqrestore(&nesqp->lock, flags);
				flush_wqes(nesvnic->nesdev, nesqp, NES_CQP_FLUSH_RQ, 1);
			} else {
				spin_unlock_irqrestore(&nesqp->lock, flags);
			}

			/* This reference is from either ModifyQP or the AE processing,
					there is still a race here with modifyqp */
			nes_rem_ref(&nesqp->ibqp);

		} else {
			cm_id = nesqp->cm_id;
			spin_unlock_irqrestore(&nesqp->lock, flags);
			/* check to see if the inbound reset beat the outbound reset */
			if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
				nes_debug(NES_DBG_CM, "QP%u: Decing refcount due to inbound reset"
						" beating the outbound reset.\n",
						nesqp->hwqp.qp_id);
				nes_rem_ref(&nesqp->ibqp);
			}
		}
	} else {
		nesqp->disconn_pending = 0;
		spin_unlock_irqrestore(&nesqp->lock, flags);
	}
	nes_rem_ref(&nesqp->ibqp);

	return 0;
}


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

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

	nesdev = nesvnic->nesdev;

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

	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) {
			pci_free_consistent(nesdev->pcidev,
					nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
					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);
		nesqp->cm_node = NULL;
	}

	return ret;
}


/**
 * nes_accept
 */
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;

	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;

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

	/* since this is from a listen, we were able to put node handle into cm_id */
	cm_node = (struct nes_cm_node *)cm_id->provider_data;

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

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

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

		/* allocate the ietf frame and space for private data */
		nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
				sizeof(struct ietf_mpa_frame) + 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;
		}


		/* setup the MPA frame */
		nesqp->private_data_len = conn_param->private_data_len;
		memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);

		memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
				conn_param->private_data_len);

		nesqp->ietf_frame->priv_data_len = cpu_to_be16(conn_param->private_data_len);
		nesqp->ietf_frame->rev = mpa_version;
		nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;

		/* 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;
			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(conn_param->private_data_len + sizeof(struct ietf_mpa_frame));
			wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] =
					cpu_to_le32((u32)nesqp->ietf_frame_pbase);
			wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] =
					cpu_to_le32((u32)((u64)nesqp->ietf_frame_pbase >> 32));
			wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
					cpu_to_le32(conn_param->private_data_len + sizeof(struct ietf_mpa_frame));
			wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;

			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_LSMM_PRESENT |
					NES_QPCONTEXT_ORDIRD_WRPDU | NES_QPCONTEXT_ORDIRD_ALSMM));
		}
		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;

	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=%zu.\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),
			conn_param->private_data_len+sizeof(struct ietf_mpa_frame));

	attr.qp_state = IB_QPS_RTS;
	nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);

	/* notify OF layer that accept event was successfull */
	cm_id->add_ref(cm_id);

	cm_event.event = IW_CM_EVENT_ESTABLISHED;
	cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
	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);
	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, nesqp->ietf_frame->priv_data,
			   nesqp->private_data_len);
		create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
	}
	if (ret)
		printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
				__FUNCTION__, __LINE__, ret);

	return 0;
}


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

	atomic_inc(&cm_rejects);
	cm_node = (struct nes_cm_node *) cm_id->provider_data;
	cm_core = cm_node->cm_core;
	cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;

	strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
	memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);

	cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
	cm_node->mpa_frame.rev = mpa_version;
	cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;

	cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);

	return 0;
}


/**
 * nes_connect
 * setup and launch cm connect 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;

	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;

	atomic_inc(&cm_connects);

	nesqp->ietf_frame = kzalloc(sizeof(struct ietf_mpa_frame) +
			conn_param->private_data_len, GFP_KERNEL);
	if (!nesqp->ietf_frame)
		return -ENOMEM;

	/* set qp as having an active connection */
	nesqp->active_conn = 1;

	nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = 0x%08X:0x%04X.\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));

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

	cm_id->provider_data = nesqp;

	/* copy the private data */
	if (conn_param->private_data_len) {
		memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
				conn_param->private_data_len);
	}

	nesqp->private_data_len = conn_param->private_data_len;
	nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
	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);

	strcpy(&nesqp->ietf_frame->key[0], IEFT_MPA_KEY_REQ);
	nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
	nesqp->ietf_frame->rev = IETF_MPA_VERSION;
	nesqp->ietf_frame->priv_data_len = htons(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);

	/* set up the connection params for the node */
	cm_info.loc_addr = (cm_id->local_addr.sin_addr.s_addr);
	cm_info.loc_port = (cm_id->local_addr.sin_port);
	cm_info.rem_addr = (cm_id->remote_addr.sin_addr.s_addr);
	cm_info.rem_port = (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);
	nes_add_ref(&nesqp->ibqp);

	/* create a connect CM node connection */
	cm_node = g_cm_core->api->connect(g_cm_core, nesvnic, nesqp->ietf_frame, &cm_info);
	if (!cm_node) {
		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_DEL);
		nes_rem_ref(&nesqp->ibqp);
		kfree(nesqp->ietf_frame);
		nesqp->ietf_frame = NULL;
		cm_id->rem_ref(cm_id);
		return -ENOMEM;
	}

	cm_node->apbvt_set = 1;
	nesqp->cm_node = cm_node;

	return 0;
}


/**
 * nes_create_listen
 */
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;
	struct nes_adapter *adapter;
	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;
	adapter = nesvnic->nesdev->nesadapter;
	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("%s[%u] Error returned from listen API call\n",
				__FUNCTION__, __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("nes_manage_apbvt call returned %d.\n", err);
			g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
			return err;
		}
		cm_listens_created++;
	}

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


	return 0;
}


/**
 * nes_destroy_listen
 */
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;
}


/**
 * nes_cm_recv
 */
int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
{
	cm_packets_received++;
	if ((g_cm_core) && (g_cm_core->api)) {
		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 0;
}


/**
 * nes_cm_start
 * Start and init a cm core module
 */
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;
	}
}


/**
 * nes_cm_stop
 * stop and dealloc all cm core instances
 */
int nes_cm_stop(void)
{
	g_cm_core->api->destroy_cm_core(g_cm_core);
	return 0;
}


/**
 * cm_event_connected
 * handle a connected event, setup QPs and HW
 */
void cm_event_connected(struct nes_cm_event *event)
{
	u64 u64temp;
	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_hw_qp_wqe *wqe;
	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;

#if defined(NES_SEND_FIRST_WRITE)
		if (cm_node->send_write0) {
			nes_debug(NES_DBG_CM, "Sending first write.\n");
			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_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_FRAG0_LOW_IDX] = 0;
			wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
			wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
			wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;

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

	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);

	/* modify QP state to rts */
	attr.qp_state = IB_QPS_RTS;
	nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);

	/* notify OF layer we successfully created the requested connection */
	cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
	cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
	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.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("%s[%u] OFA CM event_handler returned, ret=%d\n",
				__FUNCTION__, __LINE__, ret);
	nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = %lu\n",
			nesqp->hwqp.qp_id, jiffies );

	nes_rem_ref(&nesqp->ibqp);

	return;
}


/**
 * cm_event_connect_error
 */
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 = IW_CM_EVENT_STATUS_REJECTED;
	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("%s[%u] OFA CM event_handler returned, ret=%d\n",
				__FUNCTION__, __LINE__, ret);
	nes_rem_ref(&nesqp->ibqp);
		cm_id->rem_ref(cm_id);

	return;
}


/**
 * cm_event_reset
 */
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;

	nesqp->cm_id = NULL;
	/* cm_id->provider_data = NULL; */
	cm_event.event = IW_CM_EVENT_DISCONNECT;
	cm_event.status = IW_CM_EVENT_STATUS_RESET;
	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);
	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;
}


/**
 * cm_event_mpa_req
 */
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 = IW_CM_EVENT_STATUS_OK;
	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;

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

	return;
}


static void nes_cm_event_handler(struct work_struct *);

/**
 * nes_cm_post_event
 * post an event to the cm event handler
 */
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, "queue_work, event=%p\n", event);

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

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


/**
 * nes_cm_event_handler
 * worker function to handle cm events
 * will free instance of nes_cm_event
 */
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 Event: MPA REQUEST\n");
			break;
		case NES_CM_EVENT_RESET:
			nes_debug(NES_DBG_CM, "CM Event: RESET\n");
			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_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;
}