nes_cm.c 93.6 KB
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/*
 * 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>
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#include <linux/if_vlan.h>
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#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>
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#include <net/arp.h>
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#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;

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

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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);
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static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
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);
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static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
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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 *,
	enum nes_cm_event_type);
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 print_core(struct nes_cm_core *core);
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/* 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
};

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static struct nes_cm_core *g_cm_core;
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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;

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	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);
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	nes_cm_post_event(event);
	return event;
}


/**
 * send_mpa_request
 */
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static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
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{
	int ret;
	if (!skb) {
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		nes_debug(NES_DBG_CM, "skb set to NULL\n");
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		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);
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	if (ret < 0)
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		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;
}


/**
 * form_cm_frame - get a free packet and build empty frame Use
 * node info to build.
 */
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static void form_cm_frame(struct sk_buff *skb,
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	struct nes_cm_node *cm_node, void *options, u32 optionsize,
	void *data, u32 datasize, u8 flags)
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{
	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
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		cm_node->tcp_cntxt.loc_seq_num += datasize;
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	if (flags & SET_FIN) {
		cm_node->tcp_cntxt.loc_seq_num++;
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		tcph->fin = 1;
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	}
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	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++;

}


/**
 * 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, "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");
}


/**
 * 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;
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	struct nes_cm_core *cm_core = cm_node->cm_core;
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	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 -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) {
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		new_send->timetosend += (HZ/10);
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		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) {
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		new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
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		atomic_inc(&new_send->skb->users);
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		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;
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		ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
		if (ret != NETDEV_TX_OK) {
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			nes_debug(NES_DBG_CM, "Error sending packet %p "
				"(jiffies = %lu)\n", new_send, jiffies);
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			atomic_dec(&new_send->skb->users);
			new_send->timetosend = jiffies;
		} else {
			cm_packets_sent++;
			if (!send_retrans) {
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				cleanup_retrans_entry(cm_node);
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				if (close_when_complete)
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					rem_ref_cm_node(cm_core, cm_node);
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				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;
}


/**
 * nes_cm_timer_tick
 */
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static void nes_cm_timer_tick(unsigned long pass)
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{
	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;
	u32 settimer = 0;
	int ret = NETDEV_TX_OK;
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	enum nes_cm_node_state last_state;
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	struct list_head timer_list;
	INIT_LIST_HEAD(&timer_list);
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	spin_lock_irqsave(&cm_core->ht_lock, flags);

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	list_for_each_safe(list_node, list_core_temp,
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				&cm_core->connected_nodes) {
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		cm_node = container_of(list_node, struct nes_cm_node, list);
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		if (!list_empty(&cm_node->recv_list) || (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);
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		spin_lock_irqsave(&cm_node->recv_list_lock, flags);
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		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 (!recv_entry)
				break;
			if (time_after(recv_entry->timetosend, jiffies)) {
				if (nexttimeout > recv_entry->timetosend ||
					!settimer) {
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					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);
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			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));
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			}
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			if (cm_id)
				cm_id->rem_ref(cm_id);

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

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			if (!send_entry->retranscount ||
				!send_entry->retrycount) {
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				cm_packets_dropped++;
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				last_state = cm_node->state;
				cm_node->state = NES_CM_STATE_CLOSED;
				free_retrans_entry(cm_node);
				spin_unlock_irqrestore(
					&cm_node->retrans_list_lock, flags);
				if (last_state == NES_CM_STATE_SYN_RCVD)
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					rem_ref_cm_node(cm_core, cm_node);
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				else
					create_event(cm_node,
						NES_CM_EVENT_ABORTED);
				spin_lock_irqsave(&cm_node->retrans_list_lock,
					flags);
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				break;
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			}
			atomic_inc(&send_entry->skb->users);
			cm_packets_retrans++;
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			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);
581
			ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
582
			spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
583
			if (ret != NETDEV_TX_OK) {
584 585
				nes_debug(NES_DBG_CM, "rexmit failed for "
					"node=%p\n", cm_node);
586 587 588 589 590
				cm_packets_bounced++;
				atomic_dec(&send_entry->skb->users);
				send_entry->retrycount--;
				nexttimeout = jiffies + NES_SHORT_TIME;
				settimer = 1;
591
				break;
592 593 594
			} else {
				cm_packets_sent++;
			}
595 596 597 598
			nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
				"%u, retry count = %u.\n",
				send_entry->retranscount,
				send_entry->retrycount);
599 600
			if (send_entry->send_retrans) {
				send_entry->retranscount--;
601 602 603 604
				send_entry->timetosend = jiffies +
					NES_RETRY_TIMEOUT;
				if (nexttimeout > send_entry->timetosend ||
					!settimer) {
605 606 607 608 609
					nexttimeout = send_entry->timetosend;
					settimer = 1;
				}
			} else {
				int close_when_complete;
610 611 612 613 614 615 616 617
				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);
618
			}
619
		} while (0);
620

621 622 623 624 625
		spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
		rem_ref_cm_node(cm_node->cm_core, cm_node);
		if (ret != NETDEV_TX_OK) {
			nes_debug(NES_DBG_CM, "rexmit failed for cm_node=%p\n",
				cm_node);
626
			break;
627
		}
628 629 630 631 632 633 634 635 636 637 638 639 640 641
	}

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


/**
 * send_syn
 */
642 643
static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
	struct sk_buff *skb)
644 645 646 647
{
	int ret;
	int flags = SET_SYN;
	char optionsbuffer[sizeof(struct option_mss) +
648 649
		sizeof(struct option_windowscale) + sizeof(struct option_base) +
		TCP_OPTIONS_PADDING];
650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669

	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);

670
	if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
		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;

688
	if (!skb)
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		skb = dev_alloc_skb(MAX_CM_BUFFER);
690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707
	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
 */
708
static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
709 710 711 712
{
	int ret;
	int flags = SET_RST | SET_ACK;

713
	if (!skb)
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		skb = dev_alloc_skb(MAX_CM_BUFFER);
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729
	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, flags);
	ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);

	return ret;
}


/**
 * send_ack
 */
730
static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
731 732
{
	int ret;
733 734

	if (!skb)
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735
		skb = dev_alloc_skb(MAX_CM_BUFFER);
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751

	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
 */
752
static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
753 754 755 756 757
{
	int ret;

	/* if we didn't get a frame get one */
	if (!skb)
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Faisal Latif 已提交
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		skb = dev_alloc_skb(MAX_CM_BUFFER);
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780

	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;
}


/**
 * 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;
	struct list_head *hte;
	struct nes_cm_node *cm_node;
781
	__be32 tmp_addr = cpu_to_be32(loc_addr);
782 783 784 785

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

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	nes_debug(NES_DBG_CM, "Searching for an owner node: %pI4:%x from core %p->%p\n",
787
		  &tmp_addr, loc_port, cm_core, hte);
788 789 790

	/* walk list and find cm_node associated with this session ID */
	spin_lock_irqsave(&cm_core->ht_lock, flags);
791
	list_for_each_entry(cm_node, hte, list) {
792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
		/* 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 nes_cm_listener *listen_node;
820
	__be32 tmp_addr = cpu_to_be32(dst_addr);
821 822 823

	/* walk list and find cm_node associated with this session ID */
	spin_lock_irqsave(&cm_core->listen_list_lock, flags);
824
	list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
825 826 827 828 829 830 831 832 833 834 835 836
		/* 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);

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	nes_debug(NES_DBG_CM, "Unable to find listener for %pI4:%x\n",
838
		  &tmp_addr, dst_port);
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855

	/* 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;
	struct list_head *hte;

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

856 857
	nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
		cm_node);
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875

	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,
876
	struct nes_cm_listener *listener, int free_hanging_nodes)
877 878 879
{
	int ret = 1;
	unsigned long flags;
880 881 882
	struct list_head *list_pos = NULL;
	struct list_head *list_temp = NULL;
	struct nes_cm_node *cm_node = NULL;
883
	struct list_head reset_list;
884 885 886 887 888

	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 */
889
	INIT_LIST_HEAD(&reset_list);
890 891 892
	if (free_hanging_nodes) {
		spin_lock_irqsave(&cm_core->ht_lock, flags);
		list_for_each_safe(list_pos, list_temp,
893
				   &g_cm_core->connected_nodes) {
894 895 896
			cm_node = container_of(list_pos, struct nes_cm_node,
				list);
			if ((cm_node->listener == listener) &&
897 898 899
			    (!cm_node->accelerated)) {
				add_ref_cm_node(cm_node);
				list_add(&cm_node->reset_entry, &reset_list);
900 901 902 903
			}
		}
		spin_unlock_irqrestore(&cm_core->ht_lock, flags);
	}
904 905 906 907 908 909 910 911 912

	list_for_each_safe(list_pos, list_temp, &reset_list) {
		cm_node = container_of(list_pos, struct nes_cm_node,
					reset_entry);
		cleanup_retrans_entry(cm_node);
		send_reset(cm_node, NULL);
		rem_ref_cm_node(cm_node->cm_core, cm_node);
	}

913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
	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);
930
		listener = NULL;
931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
		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;
}


/**
B
Bob Sharp 已提交
985
 * nes_addr_resolve_neigh
986
 */
B
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987
static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
988 989 990
{
	struct rtable *rt;
	struct flowi fl;
B
Bob Sharp 已提交
991 992
	struct neighbour *neigh;
	int rc = -1;
993 994 995 996 997

	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",
998
				__func__, dst_ip);
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999
		return rc;
1000 1001
	}

B
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1002 1003 1004 1005
	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
	if (neigh) {
		if (neigh->nud_state & NUD_VALID) {
			nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
J
Johannes Berg 已提交
1006 1007
				  " is %pM, Gateway is 0x%08X \n", dst_ip,
				  neigh->ha, ntohl(rt->rt_gateway));
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1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
			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);
		}
		neigh_release(neigh);
	}

	if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
		neigh_event_send(rt->u.dst.neighbour, NULL);

1019
	ip_rt_put(rt);
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	return rc;
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
}


/**
 * 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;
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Harvey Harrison 已提交
1048 1049 1050
	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);
1051 1052 1053 1054 1055
	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);

1056 1057
	nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
			cm_node->cm_id);
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073

	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) -
1074
			sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
	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 */
1089 1090 1091 1092
	if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
		arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
	else
		arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1093
	if (arpindex < 0) {
B
Bob Sharp 已提交
1094 1095 1096 1097 1098
		arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr);
		if (arpindex < 0) {
			kfree(cm_node);
			return NULL;
		}
1099 1100 1101 1102
	}

	/* copy the mac addr to node context */
	memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
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	nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
		  cm_node->rem_mac);
1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126

	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,
1127
	struct nes_cm_node *cm_node)
1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
{
	unsigned long flags, qplockflags;
	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);
	}
1153
	BUG_ON(cm_node->send_entry);
1154 1155
	spin_lock_irqsave(&cm_node->recv_list_lock, flags);
	list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
1156 1157
		recv_entry = container_of(list_core, struct nes_timer_entry,
				list);
1158 1159 1160
		list_del(&recv_entry->list);
		cm_id = cm_node->cm_id;
		spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
		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);
1177
		}
1178 1179
		cm_id->rem_ref(cm_id);

1180 1181 1182 1183 1184 1185 1186 1187 1188 1189
		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,
1190 1191 1192
				PCI_FUNC(
				cm_node->nesvnic->nesdev->pcidev->devfn),
				NES_MANAGE_APBVT_DEL);
1193 1194 1195 1196 1197
		}
	}

	atomic_dec(&cm_core->node_cnt);
	atomic_inc(&cm_nodes_destroyed);
1198 1199 1200 1201 1202 1203
	nesqp = cm_node->nesqp;
	if (nesqp) {
		nesqp->cm_node = NULL;
		nes_rem_ref(&nesqp->ibqp);
		cm_node->nesqp = NULL;
	}
1204

1205 1206
	cm_node->freed = 1;
	kfree(cm_node);
1207 1208 1209 1210 1211 1212
	return 0;
}

/**
 * process_options
 */
1213 1214
static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
	u32 optionsize, u32 syn_packet)
1215 1216 1217 1218 1219 1220 1221 1222 1223
{
	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) {
1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
		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;
		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;
1255 1256 1257 1258 1259 1260 1261 1262
		}
		offset += all_options->as_base.length;
	}
	if ((!got_mss_option) && (syn_packet))
		cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
	return 0;
}

1263 1264 1265 1266 1267
static void drop_packet(struct sk_buff *skb)
{
	atomic_inc(&cm_accel_dropped_pkts);
	dev_kfree_skb_any(skb);
}
1268

1269 1270
static void handle_fin_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
	struct tcphdr *tcph)
1271
{
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
	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));
	cm_node->tcp_cntxt.rcv_nxt++;
	cleanup_retrans_entry(cm_node);
	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_MPAREQ_SENT:
		cm_node->state = NES_CM_STATE_LAST_ACK;
		send_fin(cm_node, skb);
		break;
	case NES_CM_STATE_FIN_WAIT1:
		cm_node->state = NES_CM_STATE_CLOSING;
		send_ack(cm_node, skb);
		break;
	case NES_CM_STATE_FIN_WAIT2:
		cm_node->state = NES_CM_STATE_TIME_WAIT;
		send_ack(cm_node, skb);
		cm_node->state = NES_CM_STATE_CLOSED;
		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);
		drop_packet(skb);
		break;
1300
	}
1301
}
1302 1303


1304 1305 1306
static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
	struct tcphdr *tcph)
{
1307

1308
	int	reset = 0;	/* whether to send reset in case of err.. */
1309
	int	passive_state;
1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322
	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);
		active_open_err(cm_node, skb, reset);
		break;
1323 1324 1325 1326 1327 1328 1329 1330
	case NES_CM_STATE_MPAREQ_RCVD:
		passive_state = atomic_add_return(1, &cm_node->passive_state);
		if (passive_state ==  NES_SEND_RESET_EVENT)
			create_event(cm_node, NES_CM_EVENT_RESET);
		cleanup_retrans_entry(cm_node);
		cm_node->state = NES_CM_STATE_CLOSED;
		dev_kfree_skb_any(skb);
		break;
1331 1332 1333 1334 1335 1336 1337
	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:
1338 1339 1340 1341 1342 1343
		active_open_err(cm_node, skb, reset);
		break;
	case NES_CM_STATE_CLOSED:
		cleanup_retrans_entry(cm_node);
		drop_packet(skb);
		break;
1344
	default:
1345
		drop_packet(skb);
1346 1347 1348
		break;
	}
}
1349

1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367
static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb,
	enum nes_cm_event_type type)
{

	int	ret;
	int datasize = skb->len;
	u8 *dataloc = skb->data;
	ret = parse_mpa(cm_node, dataloc, datasize);
	if (ret < 0) {
		nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
		if (type == NES_CM_EVENT_CONNECTED) {
			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);
1368
		}
1369 1370 1371 1372 1373
	} else {
		cleanup_retrans_entry(cm_node);
		dev_kfree_skb_any(skb);
		if (type == NES_CM_EVENT_CONNECTED)
			cm_node->state = NES_CM_STATE_TSA;
1374 1375 1376
		else
			atomic_set(&cm_node->passive_state,
					NES_PASSIVE_STATE_INDICATED);
1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399
		create_event(cm_node, type);

	}
	return ;
}

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);
1400
	}
1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454
}

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 ((seq + rcv_wnd) < rcv_nxt)
		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;
1455 1456

	optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1457
	skb_trim(skb, 0);
1458
	inc_sequence = ntohl(tcph->seq);
1459

1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
	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 */
		cm_node->accept_pend = 1;
		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++;
			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->state = NES_CM_STATE_SYN_RCVD;
		send_syn(cm_node, 1, skb);
		break;
1490 1491 1492 1493
	case NES_CM_STATE_CLOSED:
		cleanup_retrans_entry(cm_node);
		send_reset(cm_node, skb);
		break;
1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516
	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);
1517
	skb_trim(skb, 0);
1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540
	inc_sequence = ntohl(tcph->seq);
	switch (cm_node->state) {
	case NES_CM_STATE_SYN_SENT:
		/* 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;
1541 1542 1543 1544 1545 1546
	case NES_CM_STATE_LISTENING:
	case NES_CM_STATE_CLOSED:
		cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
		cleanup_retrans_entry(cm_node);
		send_reset(cm_node, skb);
		break;
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
	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;
	}
}
1560

1561 1562 1563 1564 1565 1566 1567
static void handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
	struct tcphdr *tcph)
{
	int datasize = 0;
	u32 inc_sequence;
	u32 rem_seq_ack;
	u32 rem_seq;
1568 1569 1570 1571 1572 1573 1574
	int ret;
	int optionsize;
	u32 temp_seq = cm_node->tcp_cntxt.loc_seq_num;

	optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
	cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);

1575 1576 1577 1578
	if (check_seq(cm_node, tcph, skb))
		return;

	skb_pull(skb, tcph->doff << 2);
1579
	inc_sequence = ntohl(tcph->seq);
1580 1581 1582 1583 1584 1585 1586
	rem_seq = ntohl(tcph->seq);
	rem_seq_ack =  ntohl(tcph->ack_seq);
	datasize = skb->len;

	switch (cm_node->state) {
	case NES_CM_STATE_SYN_RCVD:
		/* Passive OPEN */
1587 1588 1589
		ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
		if (ret)
			break;
1590
		cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1591 1592 1593 1594 1595 1596 1597 1598
		cm_node->tcp_cntxt.loc_seq_num = temp_seq;
		if (cm_node->tcp_cntxt.rem_ack_num !=
		    cm_node->tcp_cntxt.loc_seq_num) {
			nes_debug(NES_DBG_CM, "rem_ack_num != loc_seq_num\n");
			cleanup_retrans_entry(cm_node);
			send_reset(cm_node, skb);
			return;
		}
1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627
		cm_node->state = NES_CM_STATE_ESTABLISHED;
		if (datasize) {
			cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
			cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
			handle_rcv_mpa(cm_node, skb, NES_CM_EVENT_MPA_REQ);
		 } else { /* rcvd ACK only */
			dev_kfree_skb_any(skb);
			cleanup_retrans_entry(cm_node);
		 }
		break;
	case NES_CM_STATE_ESTABLISHED:
		/* Passive OPEN */
		/* We expect mpa frame to be received only */
		if (datasize) {
			cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
			cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
			handle_rcv_mpa(cm_node, skb,
				NES_CM_EVENT_MPA_REQ);
		} 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, NES_CM_EVENT_CONNECTED);
		} else { /* Could be just an ack pkt.. */
			cleanup_retrans_entry(cm_node);
			dev_kfree_skb_any(skb);
1628
		}
1629
		break;
1630 1631 1632 1633 1634
	case NES_CM_STATE_LISTENING:
	case NES_CM_STATE_CLOSED:
		cleanup_retrans_entry(cm_node);
		send_reset(cm_node, skb);
		break;
1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645
	case NES_CM_STATE_FIN_WAIT1:
	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_LAST_ACK:
	case NES_CM_STATE_CLOSING:
	case NES_CM_STATE_UNKNOWN:
	default:
		drop_packet(skb);
		break;
1646
	}
1647
}
1648 1649 1650



1651 1652 1653 1654
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];
1655
	if (optionsize) {
1656 1657 1658 1659 1660
		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)
1661
				passive_open_err(cm_node, skb, 1);
1662
			else
1663
				active_open_err(cm_node, skb, 1);
1664
			return 1;
1665
		}
1666
	}
1667 1668 1669 1670

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

1671
	if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1672
		cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1673 1674
	return 0;
}
1675

1676 1677 1678 1679
/*
 * active_open_err() will send reset() if flag set..
 * It will also send ABORT event.
 */
1680

1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
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);
1692

1693 1694 1695
	cm_node->state = NES_CM_STATE_CLOSED;
	create_event(cm_node, NES_CM_EVENT_ABORTED);
}
1696

1697 1698 1699 1700
/*
 * passive_open_err() will either do a reset() or will free up the skb and
 * remove the cm_node.
 */
1701

1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713
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);
1714
	}
1715
}
1716

1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729
/*
 * 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);
1730
	}
1731
}
1732

1733 1734 1735
static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
{
	unsigned long flags;
1736

1737 1738 1739
	spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
	free_retrans_entry(cm_node);
	spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1740 1741
}

1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788
/**
 * process_packet
 * Returns skb if to be freed, else it will return NULL if already used..
 */
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);
	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->fin)
		pkt_type = NES_PKT_TYPE_FIN;
	else if (tcph->ack)
		pkt_type = NES_PKT_TYPE_ACK;

	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:
		handle_ack_pkt(cm_node, skb, tcph);
		break;
	case NES_PKT_TYPE_RST:
		handle_rst_pkt(cm_node, skb, tcph);
		break;
	case NES_PKT_TYPE_FIN:
		handle_fin_pkt(cm_node, skb, tcph);
		break;
	default:
		drop_packet(skb);
		break;
	}
}
1789 1790 1791 1792 1793

/**
 * mini_cm_listen - create a listen node with params
 */
static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1794
	struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860
{
	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;
}


/**
 * mini_cm_connect - make a connection node with params
 */
1861
static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1862 1863
	struct nes_vnic *nesvnic, u16 private_data_len,
	void *private_data, struct nes_cm_info *cm_info)
1864 1865 1866 1867 1868 1869
{
	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;
1870 1871
	u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
	struct ietf_mpa_frame *mpa_frame = NULL;
1872 1873 1874 1875 1876

	/* create a CM connection node */
	cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
	if (!cm_node)
		return NULL;
1877 1878 1879 1880 1881
	mpa_frame = &cm_node->mpa_frame;
	strcpy(mpa_frame->key, IEFT_MPA_KEY_REQ);
	mpa_frame->flags = IETF_MPA_FLAGS_CRC;
	mpa_frame->rev =  IETF_MPA_VERSION;
	mpa_frame->priv_data_len = htons(private_data_len);
1882

G
Glenn Streiff 已提交
1883
	/* set our node side to client (active) side */
1884 1885 1886 1887
	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) {
1888 1889 1890
		loopbackremotelistener = find_listener(cm_core,
				ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
				NES_CM_LISTENER_ACTIVE_STATE);
1891 1892 1893 1894 1895 1896 1897 1898
		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;
1899 1900
			loopbackremotenode = make_cm_node(cm_core, nesvnic,
				&loopback_cm_info, loopbackremotelistener);
1901
			loopbackremotenode->loopbackpartner = cm_node;
1902 1903
			loopbackremotenode->tcp_cntxt.rcv_wscale =
				NES_CM_DEFAULT_RCV_WND_SCALE;
1904
			cm_node->loopbackpartner = loopbackremotenode;
1905 1906 1907
			memcpy(loopbackremotenode->mpa_frame_buf, private_data,
				private_data_len);
			loopbackremotenode->mpa_frame_size = private_data_len;
1908

1909 1910
			/* we are done handling this state. */
			/* set node to a TSA state */
1911
			cm_node->state = NES_CM_STATE_TSA;
1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927
			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;
1928 1929 1930 1931 1932 1933 1934 1935 1936

			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 */
1937 1938
	memcpy(mpa_frame->priv_data, private_data, private_data_len);

1939 1940 1941 1942
	cm_node->mpa_frame_size = mpa_frame_size;

	/* send a syn and goto syn sent state */
	cm_node->state = NES_CM_STATE_SYN_SENT;
1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953
	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;
	}
1954

1955 1956 1957 1958 1959
	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);
1960 1961 1962 1963 1964 1965 1966 1967 1968

	return cm_node;
}


/**
 * mini_cm_accept - accept a connection
 * This function is never called
 */
1969 1970
static int mini_cm_accept(struct nes_cm_core *cm_core,
	struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
1971 1972 1973 1974 1975 1976 1977 1978
{
	return 0;
}


/**
 * mini_cm_reject - reject and teardown a connection
 */
1979
static int mini_cm_reject(struct nes_cm_core *cm_core,
1980
	struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
1981 1982
{
	int ret = 0;
1983
	int passive_state;
1984

1985 1986
	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);
1987

1988 1989 1990
	if (cm_node->tcp_cntxt.client)
		return ret;
	cleanup_retrans_entry(cm_node);
1991

1992 1993 1994 1995 1996 1997
	passive_state = atomic_add_return(1, &cm_node->passive_state);
	cm_node->state = NES_CM_STATE_CLOSED;
	if (passive_state == NES_SEND_RESET_EVENT)
		rem_ref_cm_node(cm_core, cm_node);
	else
		ret = send_reset(cm_node, NULL);
1998 1999 2000 2001 2002 2003 2004
	return ret;
}


/**
 * mini_cm_close
 */
2005
static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2006 2007 2008 2009 2010 2011 2012
{
	int ret = 0;

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

	switch (cm_node->state) {
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045
	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:
	case NES_CM_STATE_UNKNOWN:
	case NES_CM_STATE_INITED:
	case NES_CM_STATE_CLOSED:
		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;
2046 2047 2048 2049 2050 2051 2052 2053 2054
	}
	return ret;
}


/**
 * recv_pkt - recv an ETHERNET packet, and process it through CM
 * node state machine
 */
2055
static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2056
	struct nes_vnic *nesvnic, struct sk_buff *skb)
2057 2058 2059 2060 2061 2062
{
	struct nes_cm_node *cm_node = NULL;
	struct nes_cm_listener *listener = NULL;
	struct iphdr *iph;
	struct tcphdr *tcph;
	struct nes_cm_info nfo;
2063
	int skb_handled = 1;
2064
	__be32 tmp_daddr, tmp_saddr;
2065

2066
	if (!skb)
2067
		return 0;
2068
	if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2069
		return 0;
2070 2071 2072 2073 2074 2075 2076 2077 2078 2079
	}

	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);

2080 2081 2082
	tmp_daddr = cpu_to_be32(iph->daddr);
	tmp_saddr = cpu_to_be32(iph->saddr);

H
Harvey Harrison 已提交
2083
	nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2084
		  &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2085

2086 2087
	do {
		cm_node = find_node(cm_core,
2088 2089 2090 2091
			nfo.rem_port, nfo.rem_addr,
			nfo.loc_port, nfo.loc_addr);

		if (!cm_node) {
2092 2093 2094
			/* Only type of packet accepted are for */
			/* the PASSIVE open (syn only) */
			if ((!tcph->syn) || (tcph->ack)) {
2095
				skb_handled = 0;
2096 2097 2098 2099 2100
				break;
			}
			listener = find_listener(cm_core, nfo.loc_addr,
				nfo.loc_port,
				NES_CM_LISTENER_ACTIVE_STATE);
2101 2102 2103 2104 2105
			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;
2106 2107
				break;
			}
2108 2109
			nfo.cm_id = listener->cm_id;
			nfo.conn_type = listener->conn_type;
2110 2111 2112 2113 2114 2115
			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++;
2116
				atomic_dec(&listener->ref_count);
2117 2118
				dev_kfree_skb_any(skb);
				break;
2119
			}
2120 2121 2122 2123 2124 2125 2126
			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;
2127
			}
2128 2129
			add_ref_cm_node(cm_node);
		} else if (cm_node->state == NES_CM_STATE_TSA) {
2130
			rem_ref_cm_node(cm_core, cm_node);
2131 2132 2133
			atomic_inc(&cm_accel_dropped_pkts);
			dev_kfree_skb_any(skb);
			break;
2134
		}
2135 2136 2137
		skb_reset_network_header(skb);
		skb_set_transport_header(skb, sizeof(*tcph));
		skb->len = ntohs(iph->tot_len);
2138 2139 2140
		process_packet(cm_node, skb, cm_core);
		rem_ref_cm_node(cm_core, cm_node);
	} while (0);
2141
	return skb_handled;
2142 2143 2144 2145 2146 2147
}


/**
 * nes_cm_alloc_core - allocate a top level instance of a cm core
 */
2148
static struct nes_cm_core *nes_cm_alloc_core(void)
2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190
{
	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;
}


/**
 * mini_cm_dealloc_core - deallocate a top level instance of a cm core
 */
2191
static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215
{
	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
 */
2216
static int mini_cm_get(struct nes_cm_core *cm_core)
2217 2218 2219 2220 2221 2222 2223 2224
{
	return cm_core->state;
}


/**
 * mini_cm_set
 */
2225
static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328
{
	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);
		/* init our disconnect work element, to */
		INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);

		queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2329
	} else
2330 2331 2332 2333 2334 2335 2336 2337 2338
		spin_unlock_irqrestore(&nesqp->lock, flags);

	return 0;
}


/**
 * nes_disconnect_worker
 */
2339
static void nes_disconnect_worker(struct work_struct *work)
2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351
{
	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
 */
2352
static int nes_cm_disconn_true(struct nes_qp *nesqp)
2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396
{
	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);
		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) {
				cm_event.status = IW_CM_EVENT_STATUS_RESET;
2397 2398 2399 2400 2401
				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
2402 2403 2404 2405 2406 2407 2408
				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;

2409 2410 2411 2412 2413 2414
			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));
2415 2416 2417 2418

			spin_unlock_irqrestore(&nesqp->lock, flags);
			ret = cm_id->event_handler(cm_id, &cm_event);
			if (ret)
2419 2420
				nes_debug(NES_DBG_CM, "OFA CM event_handler "
					"returned, ret=%d\n", ret);
2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461
			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);
2462 2463 2464
				flush_wqes(nesvnic->nesdev, nesqp,
					NES_CQP_FLUSH_RQ, 1);
			} else
2465 2466 2467 2468 2469 2470
				spin_unlock_irqrestore(&nesqp->lock, flags);
		} 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)) {
2471 2472 2473
				nes_debug(NES_DBG_CM, "QP%u: Decing refcount "
					"due to inbound reset beating the "
					"outbound reset.\n", nesqp->hwqp.qp_id);
2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487
			}
		}
	} else {
		nesqp->disconn_pending = 0;
		spin_unlock_irqrestore(&nesqp->lock, flags);
	}

	return 0;
}


/**
 * nes_disconnect
 */
2488
static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542
{
	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);
	}

	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;
2543
	u32 crc_value;
2544
	int ret;
2545
	int passive_state;
2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557

	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;
2558 2559 2560
	nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
		"%s\n", cm_node, nesvnic, nesvnic->netdev,
		nesvnic->netdev->name);
2561 2562 2563

	/* associate the node with the QP */
	nesqp->cm_node = (void *)cm_node;
2564 2565
	cm_node->nesqp = nesqp;
	nes_add_ref(&nesqp->ibqp);
2566

2567 2568
	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);
2569 2570 2571 2572 2573
	atomic_inc(&cm_accepts);

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

2574 2575 2576 2577
	/* 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);
2578

2579 2580 2581 2582 2583
	if (!nesqp->ietf_frame) {
		nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
			"data\n");
		return -ENOMEM;
	}
2584 2585


2586 2587 2588
	/* 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);
2589

2590 2591
	memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
			conn_param->private_data_len);
2592

2593 2594 2595 2596
	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;
2597

2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632
	/* 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;
2633 2634 2635 2636 2637 2638 2639 2640 2641 2642


	/* 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;

2643 2644 2645 2646
	if (cm_node->state == NES_CM_STATE_TSA)
		nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
			cm_node);

2647 2648
	nes_cm_init_tsa_conn(nesqp, cm_node);

2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659
	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));

	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
		nesqp->nesqp_context->ip0 =
			cpu_to_le32(ntohl(nesvnic->local_ipaddr));
	else
		nesqp->nesqp_context->ip0 =
			cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2660 2661

	nesqp->nesqp_context->misc2 |= cpu_to_le32(
2662 2663
			(u32)PCI_FUNC(nesdev->pcidev->devfn) <<
			NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2664

2665 2666 2667
	nesqp->nesqp_context->arp_index_vlan |=
		cpu_to_le32(nes_arp_table(nesdev,
			le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2668 2669 2670
			NES_ARP_RESOLVE) << 16);

	nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2671
		jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2672 2673 2674 2675

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

	nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2676 2677 2678
		((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
	nesqp->nesqp_context->ird_ord_sizes |=
		cpu_to_le32((u32)conn_param->ord);
2679 2680

	memset(&nes_quad, 0, sizeof(nes_quad));
2681 2682 2683 2684 2685 2686 2687 2688
	nes_quad.DstIpAdrIndex =
		cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
		nes_quad.SrcIpadr = nesvnic->local_ipaddr;
	else
		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;
2689 2690

	/* Produce hash key */
2691 2692
	crc_value = get_crc_value(&nes_quad);
	nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2693
	nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2694
		nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2695 2696 2697 2698 2699 2700

	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);

2701 2702 2703
	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,
2704 2705 2706 2707 2708 2709
			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),
2710 2711
			conn_param->private_data_len +
			sizeof(struct ietf_mpa_frame));
2712 2713


C
Coly Li 已提交
2714
	/* notify OF layer that accept event was successful */
2715 2716 2717 2718 2719 2720 2721 2722 2723 2724
	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);
2725 2726
	attr.qp_state = IB_QPS_RTS;
	nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2727
	if (cm_node->loopbackpartner) {
2728 2729
		cm_node->loopbackpartner->mpa_frame_size =
			nesqp->private_data_len;
2730
		/* copy entire MPA frame to our cm_node's frame */
2731 2732
		memcpy(cm_node->loopbackpartner->mpa_frame_buf,
			nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2733 2734 2735
		create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
	}
	if (ret)
2736 2737
		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
			"ret=%d\n", __func__, __LINE__, ret);
2738

2739 2740 2741
	passive_state = atomic_add_return(1, &cm_node->passive_state);
	if (passive_state == NES_SEND_RESET_EVENT)
		create_event(cm_node, NES_CM_EVENT_RESET);
2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797
	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;

2798 2799 2800 2801 2802 2803 2804
	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));
2805

2806
	atomic_inc(&cm_connects);
2807 2808 2809 2810 2811 2812 2813 2814 2815 2816
	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);
	nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2817 2818
	nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
		conn_param->private_data_len);
2819

2820 2821
	if (cm_id->local_addr.sin_addr.s_addr !=
		cm_id->remote_addr.sin_addr.s_addr)
2822
		nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2823
			PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2824 2825

	/* set up the connection params for the node */
2826 2827 2828 2829
	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);
2830 2831 2832 2833 2834 2835
	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 */
2836 2837 2838
	cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
		conn_param->private_data_len, (void *)conn_param->private_data,
		&cm_info);
2839
	if (!cm_node) {
2840 2841
		if (cm_id->local_addr.sin_addr.s_addr !=
				cm_id->remote_addr.sin_addr.s_addr)
2842
			nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2843 2844 2845
				PCI_FUNC(nesdev->pcidev->devfn),
				NES_MANAGE_APBVT_DEL);

2846 2847 2848 2849 2850 2851
		cm_id->rem_ref(cm_id);
		return -ENOMEM;
	}

	cm_node->apbvt_set = 1;
	nesqp->cm_node = cm_node;
2852
	cm_node->nesqp = nesqp;
2853
	nes_add_ref(&nesqp->ibqp);
2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894

	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) {
2895
		printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
2896
				__func__, __LINE__);
2897 2898 2899 2900 2901 2902
		return -ENOMEM;
	}

	cm_id->provider_data = cm_node;

	if (!cm_node->reused_node) {
2903 2904 2905 2906
		err = nes_manage_apbvt(nesvnic,
			ntohs(cm_id->local_addr.sin_port),
			PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
			NES_MANAGE_APBVT_ADD);
2907
		if (err) {
2908 2909
			printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
				err);
2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944
			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)
{
2945
	int rc = 0;
2946 2947
	cm_packets_received++;
	if ((g_cm_core) && (g_cm_core->api)) {
2948
		rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
2949 2950 2951 2952 2953
	} else {
		nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
				" cm is not setup properly.\n");
	}

2954
	return rc;
2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989
}


/**
 * 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
 */
2990
static void cm_event_connected(struct nes_cm_event *event)
2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002
{
	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;
3003
	u32 crc_value;
3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029
	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 */
3030 3031 3032 3033 3034 3035 3036 3037 3038 3039
	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));
	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
		nesqp->nesqp_context->ip0 =
			cpu_to_le32(ntohl(nesvnic->local_ipaddr));
	else
		nesqp->nesqp_context->ip0 =
			cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3040 3041

	nesqp->nesqp_context->misc2 |= cpu_to_le32(
3042 3043
			(u32)PCI_FUNC(nesdev->pcidev->devfn) <<
			NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3044
	nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3045 3046
			nes_arp_table(nesdev,
			le32_to_cpu(nesqp->nesqp_context->ip0),
3047 3048 3049 3050 3051
			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 |=
3052 3053
			cpu_to_le32((u32)1 <<
			NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3054 3055 3056 3057 3058

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

#if defined(NES_SEND_FIRST_WRITE)
3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083
	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);
	}
3084 3085 3086 3087
#endif

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

3088 3089 3090 3091 3092 3093
	nes_quad.DstIpAdrIndex =
		cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
		nes_quad.SrcIpadr = nesvnic->local_ipaddr;
	else
		nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3094 3095 3096 3097
	nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
	nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;

	/* Produce hash key */
3098 3099
	crc_value = get_crc_value(&nes_quad);
	nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117
	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 = 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;

3118 3119
	cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
	cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3120 3121 3122 3123 3124 3125

	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)
3126 3127 3128 3129
		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);
3130

3131 3132
	nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
		"%lu\n", nesqp->hwqp.qp_id, jiffies);
3133 3134 3135 3136 3137 3138 3139 3140

	return;
}


/**
 * cm_event_connect_error
 */
3141
static void cm_event_connect_error(struct nes_cm_event *event)
3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175
{
	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;

3176 3177 3178
	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);
3179 3180 3181 3182

	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)
3183 3184 3185
		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
			"ret=%d\n", __func__, __LINE__, ret);
	cm_id->rem_ref(cm_id);
3186

3187
	rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3188 3189 3190 3191 3192 3193 3194
	return;
}


/**
 * cm_event_reset
 */
3195
static void cm_event_reset(struct nes_cm_event *event)
3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224
{
	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);
3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236
	cm_id->add_ref(cm_id);
	atomic_inc(&cm_closes);
	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;
	nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
	ret = cm_id->event_handler(cm_id, &cm_event);

3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249
	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
 */
3250
static void cm_event_mpa_req(struct nes_cm_event *event)
3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283
{
	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",
3284
				__func__, __LINE__, ret);
3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295

	return;
}


static void nes_cm_event_handler(struct work_struct *);

/**
 * nes_cm_post_event
 * post an event to the cm event handler
 */
3296
static int nes_cm_post_event(struct nes_cm_event *event)
3297 3298 3299 3300 3301
{
	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);
3302 3303
	nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
		event->cm_node, event);
3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318

	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)
{
3319 3320
	struct nes_cm_event *event = container_of(work, struct nes_cm_event,
			event_work);
3321 3322
	struct nes_cm_core *cm_core;

3323
	if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3324
		return;
3325

3326 3327
	cm_core = event->cm_node->cm_core;
	nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3328
		event, event->type, atomic_read(&cm_core->events_posted));
3329 3330

	switch (event->type) {
3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343
	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))
3344
			break;
3345 3346 3347 3348 3349 3350
		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))
3351
			break;
3352 3353 3354 3355 3356 3357 3358 3359 3360
		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;
3361 3362 3363 3364 3365 3366 3367 3368 3369
	}

	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;
}