1/*
   2 * Copyright (c) 2006 - 2011 Intel Corporation.  All rights reserved.
   3 *
   4 * This software is available to you under a choice of one of two
   5 * licenses.  You may choose to be licensed under the terms of the GNU
   6 * General Public License (GPL) Version 2, available from the file
   7 * COPYING in the main directory of this source tree, or the
   8 * OpenIB.org BSD license below:
   9 *
  10 *     Redistribution and use in source and binary forms, with or
  11 *     without modification, are permitted provided that the following
  12 *     conditions are met:
  13 *
  14 *      - Redistributions of source code must retain the above
  15 *        copyright notice, this list of conditions and the following
  16 *        disclaimer.
  17 *
  18 *      - Redistributions in binary form must reproduce the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer in the documentation and/or other materials
  21 *        provided with the distribution.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30 * SOFTWARE.
  31 *
  32 */
  33
  34
  35#define TCPOPT_TIMESTAMP 8
  36
  37#include <linux/atomic.h>
  38#include <linux/skbuff.h>
  39#include <linux/ip.h>
  40#include <linux/tcp.h>
  41#include <linux/init.h>
  42#include <linux/if_arp.h>
  43#include <linux/if_vlan.h>
  44#include <linux/notifier.h>
  45#include <linux/net.h>
  46#include <linux/types.h>
  47#include <linux/timer.h>
  48#include <linux/time.h>
  49#include <linux/delay.h>
  50#include <linux/etherdevice.h>
  51#include <linux/netdevice.h>
  52#include <linux/random.h>
  53#include <linux/list.h>
  54#include <linux/threads.h>
  55#include <linux/highmem.h>
  56#include <linux/slab.h>
  57#include <net/arp.h>
  58#include <net/neighbour.h>
  59#include <net/route.h>
  60#include <net/ip_fib.h>
  61#include <net/tcp.h>
  62
  63#include "nes.h"
  64
  65u32 cm_packets_sent;
  66u32 cm_packets_bounced;
  67u32 cm_packets_dropped;
  68u32 cm_packets_retrans;
  69u32 cm_packets_created;
  70u32 cm_packets_received;
  71atomic_t cm_listens_created;
  72atomic_t cm_listens_destroyed;
  73u32 cm_backlog_drops;
  74atomic_t cm_loopbacks;
  75atomic_t cm_nodes_created;
  76atomic_t cm_nodes_destroyed;
  77atomic_t cm_accel_dropped_pkts;
  78atomic_t cm_resets_recvd;
  79
  80static inline int mini_cm_accelerated(struct nes_cm_core *, struct nes_cm_node *);
  81static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *, struct nes_vnic *, struct nes_cm_info *);
  82static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
  83static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *, struct nes_vnic *, u16, void *, struct nes_cm_info *);
  84static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
  85static int mini_cm_accept(struct nes_cm_core *, struct nes_cm_node *);
  86static int mini_cm_reject(struct nes_cm_core *, struct nes_cm_node *);
  87static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *, struct sk_buff *);
  88static int mini_cm_dealloc_core(struct nes_cm_core *);
  89static int mini_cm_get(struct nes_cm_core *);
  90static int mini_cm_set(struct nes_cm_core *, u32, u32);
  91
  92static void form_cm_frame(struct sk_buff *, struct nes_cm_node *, void *, u32, void *, u32, u8);
  93static int add_ref_cm_node(struct nes_cm_node *);
  94static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
  95
  96static int nes_cm_disconn_true(struct nes_qp *);
  97static int nes_cm_post_event(struct nes_cm_event *event);
  98static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
  99static void nes_disconnect_worker(struct work_struct *work);
 100
 101static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
 102static int send_mpa_reject(struct nes_cm_node *);
 103static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
 104static int send_reset(struct nes_cm_node *, struct sk_buff *);
 105static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
 106static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
 107static void process_packet(struct nes_cm_node *, struct sk_buff *, struct nes_cm_core *);
 108
 109static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
 110static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
 111static void cleanup_retrans_entry(struct nes_cm_node *);
 112static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
 113static void free_retrans_entry(struct nes_cm_node *cm_node);
 114static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph, struct sk_buff *skb, int optionsize, int passive);
 115
 116/* CM event handler functions */
 117static void cm_event_connected(struct nes_cm_event *);
 118static void cm_event_connect_error(struct nes_cm_event *);
 119static void cm_event_reset(struct nes_cm_event *);
 120static void cm_event_mpa_req(struct nes_cm_event *);
 121static void cm_event_mpa_reject(struct nes_cm_event *);
 122static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
 123
 124/* MPA build functions */
 125static int cm_build_mpa_frame(struct nes_cm_node *, u8 **, u16 *, u8 *, u8);
 126static void build_mpa_v2(struct nes_cm_node *, void *, u8);
 127static void build_mpa_v1(struct nes_cm_node *, void *, u8);
 128static void build_rdma0_msg(struct nes_cm_node *, struct nes_qp **);
 129
 130static void print_core(struct nes_cm_core *core);
 131
 132/* External CM API Interface */
 133/* instance of function pointers for client API */
 134/* set address of this instance to cm_core->cm_ops at cm_core alloc */
 135static struct nes_cm_ops nes_cm_api = {
 136	mini_cm_accelerated,
 137	mini_cm_listen,
 138	mini_cm_del_listen,
 139	mini_cm_connect,
 140	mini_cm_close,
 141	mini_cm_accept,
 142	mini_cm_reject,
 143	mini_cm_recv_pkt,
 144	mini_cm_dealloc_core,
 145	mini_cm_get,
 146	mini_cm_set
 147};
 148
 149static struct nes_cm_core *g_cm_core;
 150
 151atomic_t cm_connects;
 152atomic_t cm_accepts;
 153atomic_t cm_disconnects;
 154atomic_t cm_closes;
 155atomic_t cm_connecteds;
 156atomic_t cm_connect_reqs;
 157atomic_t cm_rejects;
 158
 159int nes_add_ref_cm_node(struct nes_cm_node *cm_node)
 160{
 161	return add_ref_cm_node(cm_node);
 162}
 163
 164int nes_rem_ref_cm_node(struct nes_cm_node *cm_node)
 165{
 166	return rem_ref_cm_node(cm_node->cm_core, cm_node);
 167}
 168
 169/**
 170 * create_event
 171 */
 172static struct nes_cm_event *create_event(struct nes_cm_node *	cm_node,
 173					 enum nes_cm_event_type type)
 174{
 175	struct nes_cm_event *event;
 176
 177	if (!cm_node->cm_id)
 178		return NULL;
 179
 180	/* allocate an empty event */
 181	event = kzalloc(sizeof(*event), GFP_ATOMIC);
 182
 183	if (!event)
 184		return NULL;
 185
 186	event->type = type;
 187	event->cm_node = cm_node;
 188	event->cm_info.rem_addr = cm_node->rem_addr;
 189	event->cm_info.loc_addr = cm_node->loc_addr;
 190	event->cm_info.rem_port = cm_node->rem_port;
 191	event->cm_info.loc_port = cm_node->loc_port;
 192	event->cm_info.cm_id = cm_node->cm_id;
 193
 194	nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
 195		  "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
 196		  cm_node, event, type, event->cm_info.loc_addr,
 197		  event->cm_info.loc_port, event->cm_info.rem_addr,
 198		  event->cm_info.rem_port);
 199
 200	nes_cm_post_event(event);
 201	return event;
 202}
 203
 204
 205/**
 206 * send_mpa_request
 207 */
 208static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
 209{
 210	u8 start_addr = 0;
 211	u8 *start_ptr = &start_addr;
 212	u8 **start_buff = &start_ptr;
 213	u16 buff_len = 0;
 214
 215	if (!skb) {
 216		nes_debug(NES_DBG_CM, "skb set to NULL\n");
 217		return -1;
 218	}
 219
 220	/* send an MPA Request frame */
 221	cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REQUEST);
 222	form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK);
 223
 224	return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 225}
 226
 227
 228
 229static int send_mpa_reject(struct nes_cm_node *cm_node)
 230{
 231	struct sk_buff *skb = NULL;
 232	u8 start_addr = 0;
 233	u8 *start_ptr = &start_addr;
 234	u8 **start_buff = &start_ptr;
 235	u16 buff_len = 0;
 236	struct ietf_mpa_v1 *mpa_frame;
 237
 238	skb = dev_alloc_skb(MAX_CM_BUFFER);
 239	if (!skb) {
 240		nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
 241		return -ENOMEM;
 242	}
 243
 244	/* send an MPA reject frame */
 245	cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REPLY);
 246	mpa_frame = (struct ietf_mpa_v1 *)*start_buff;
 247	mpa_frame->flags |= IETF_MPA_FLAGS_REJECT;
 248	form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK | SET_FIN);
 249
 250	cm_node->state = NES_CM_STATE_FIN_WAIT1;
 251	return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
 252}
 253
 254
 255/**
 256 * recv_mpa - process a received TCP pkt, we are expecting an
 257 * IETF MPA frame
 258 */
 259static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
 260		     u32 len)
 261{
 262	struct ietf_mpa_v1 *mpa_frame;
 263	struct ietf_mpa_v2 *mpa_v2_frame;
 264	struct ietf_rtr_msg *rtr_msg;
 265	int mpa_hdr_len;
 266	int priv_data_len;
 267
 268	*type = NES_MPA_REQUEST_ACCEPT;
 269
 270	/* assume req frame is in tcp data payload */
 271	if (len < sizeof(struct ietf_mpa_v1)) {
 272		nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
 273		return -EINVAL;
 274	}
 275
 276	/* points to the beginning of the frame, which could be MPA V1 or V2 */
 277	mpa_frame = (struct ietf_mpa_v1 *)buffer;
 278	mpa_hdr_len = sizeof(struct ietf_mpa_v1);
 279	priv_data_len = ntohs(mpa_frame->priv_data_len);
 280
 281	/* make sure mpa private data len is less than 512 bytes */
 282	if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
 283		nes_debug(NES_DBG_CM, "The received Length of Private"
 284			  " Data field exceeds 512 octets\n");
 285		return -EINVAL;
 286	}
 287	/*
 288	 * make sure MPA receiver interoperate with the
 289	 * received MPA version and MPA key information
 290	 *
 291	 */
 292	if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
 293		nes_debug(NES_DBG_CM, "The received mpa version"
 294			  " is not supported\n");
 295		return -EINVAL;
 296	}
 297	/*
 298	* backwards compatibility only
 299	*/
 300	if (mpa_frame->rev > cm_node->mpa_frame_rev) {
 301		nes_debug(NES_DBG_CM, "The received mpa version"
 302			" can not be interoperated\n");
 303		return -EINVAL;
 304	} else {
 305		cm_node->mpa_frame_rev = mpa_frame->rev;
 306	}
 307
 308	if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
 309		if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
 310			nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
 311			return -EINVAL;
 312		}
 313	} else {
 314		if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
 315			nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
 316			return -EINVAL;
 317		}
 318	}
 319
 320
 321	if (priv_data_len + mpa_hdr_len != len) {
 322		nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
 323			" complete (%x + %x != %x)\n",
 324			priv_data_len, mpa_hdr_len, len);
 325		return -EINVAL;
 326	}
 327	/* make sure it does not exceed the max size */
 328	if (len > MAX_CM_BUFFER) {
 329		nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
 330			" (%x + %x != %x)\n",
 331			priv_data_len, mpa_hdr_len, len);
 332		return -EINVAL;
 333	}
 334
 335	cm_node->mpa_frame_size = priv_data_len;
 336
 337	switch (mpa_frame->rev) {
 338	case IETF_MPA_V2: {
 339		u16 ird_size;
 340		u16 ord_size;
 341		u16 rtr_ctrl_ird;
 342		u16 rtr_ctrl_ord;
 343
 344		mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
 345		mpa_hdr_len += IETF_RTR_MSG_SIZE;
 346		cm_node->mpa_frame_size -= IETF_RTR_MSG_SIZE;
 347		rtr_msg = &mpa_v2_frame->rtr_msg;
 348
 349		/* parse rtr message */
 350		rtr_ctrl_ird = ntohs(rtr_msg->ctrl_ird);
 351		rtr_ctrl_ord = ntohs(rtr_msg->ctrl_ord);
 352		ird_size = rtr_ctrl_ird & IETF_NO_IRD_ORD;
 353		ord_size = rtr_ctrl_ord & IETF_NO_IRD_ORD;
 354
 355		if (!(rtr_ctrl_ird & IETF_PEER_TO_PEER)) {
 356			/* send reset */
 357			return -EINVAL;
 358		}
 359
 360		if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
 361			/* responder */
 362			if (cm_node->ord_size > ird_size)
 363				cm_node->ord_size = ird_size;
 364		} else {
 365			/* initiator */
 366			if (cm_node->ord_size > ird_size)
 367				cm_node->ord_size = ird_size;
 368
 369			if (cm_node->ird_size < ord_size) {
 370				/* no resources available */
 371				/* send terminate message */
 372				return -EINVAL;
 373			}
 374		}
 375
 376		if (rtr_ctrl_ord & IETF_RDMA0_READ) {
 377			cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
 378		} else if (rtr_ctrl_ord & IETF_RDMA0_WRITE) {
 379			cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
 380		} else {        /* Not supported RDMA0 operation */
 381			return -EINVAL;
 382		}
 383		break;
 384	}
 385	case IETF_MPA_V1:
 386	default:
 387		break;
 388	}
 389
 390	/* copy entire MPA frame to our cm_node's frame */
 391	memcpy(cm_node->mpa_frame_buf, buffer + mpa_hdr_len, cm_node->mpa_frame_size);
 392
 393	if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
 394		*type = NES_MPA_REQUEST_REJECT;
 395	return 0;
 396}
 397
 398
 399/**
 400 * form_cm_frame - get a free packet and build empty frame Use
 401 * node info to build.
 402 */
 403static void form_cm_frame(struct sk_buff *skb,
 404			  struct nes_cm_node *cm_node, void *options, u32 optionsize,
 405			  void *data, u32 datasize, u8 flags)
 406{
 407	struct tcphdr *tcph;
 408	struct iphdr *iph;
 409	struct ethhdr *ethh;
 410	u8 *buf;
 411	u16 packetsize = sizeof(*iph);
 412
 413	packetsize += sizeof(*tcph);
 414	packetsize += optionsize + datasize;
 415
 416	skb_trim(skb, 0);
 417	memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
 418
 419	buf = skb_put(skb, packetsize + ETH_HLEN);
 420
 421	ethh = (struct ethhdr *)buf;
 422	buf += ETH_HLEN;
 423
 424	iph = (struct iphdr *)buf;
 425	buf += sizeof(*iph);
 426	tcph = (struct tcphdr *)buf;
 427	skb_reset_mac_header(skb);
 428	skb_set_network_header(skb, ETH_HLEN);
 429	skb_set_transport_header(skb, ETH_HLEN + sizeof(*iph));
 430	buf += sizeof(*tcph);
 431
 432	skb->ip_summed = CHECKSUM_PARTIAL;
 433	skb->protocol = htons(0x800);
 434	skb->data_len = 0;
 435	skb->mac_len = ETH_HLEN;
 436
 437	memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
 438	memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
 439	ethh->h_proto = htons(0x0800);
 440
 441	iph->version = IPVERSION;
 442	iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
 443	iph->tos = 0;
 444	iph->tot_len = htons(packetsize);
 445	iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 446
 447	iph->frag_off = htons(0x4000);
 448	iph->ttl = 0x40;
 449	iph->protocol = 0x06;   /* IPPROTO_TCP */
 450
 451	iph->saddr = htonl(cm_node->loc_addr);
 452	iph->daddr = htonl(cm_node->rem_addr);
 453
 454	tcph->source = htons(cm_node->loc_port);
 455	tcph->dest = htons(cm_node->rem_port);
 456	tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 457
 458	if (flags & SET_ACK) {
 459		cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 460		tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 461		tcph->ack = 1;
 462	} else {
 463		tcph->ack_seq = 0;
 464	}
 465
 466	if (flags & SET_SYN) {
 467		cm_node->tcp_cntxt.loc_seq_num++;
 468		tcph->syn = 1;
 469	} else {
 470		cm_node->tcp_cntxt.loc_seq_num += datasize;
 471	}
 472
 473	if (flags & SET_FIN) {
 474		cm_node->tcp_cntxt.loc_seq_num++;
 475		tcph->fin = 1;
 476	}
 477
 478	if (flags & SET_RST)
 479		tcph->rst = 1;
 480
 481	tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
 482	tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 483	tcph->urg_ptr = 0;
 484	if (optionsize)
 485		memcpy(buf, options, optionsize);
 486	buf += optionsize;
 487	if (datasize)
 488		memcpy(buf, data, datasize);
 489
 490	skb_shinfo(skb)->nr_frags = 0;
 491	cm_packets_created++;
 492}
 493
 494/**
 495 * print_core - dump a cm core
 496 */
 497static void print_core(struct nes_cm_core *core)
 498{
 499	nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 500	nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
 501	if (!core)
 502		return;
 503	nes_debug(NES_DBG_CM, "---------------------------------------------\n");
 504
 505	nes_debug(NES_DBG_CM, "State         : %u \n", core->state);
 506
 507	nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
 508	nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
 509
 510	nes_debug(NES_DBG_CM, "core          : %p \n", core);
 511
 512	nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
 513}
 514
 515/**
 516 * cm_build_mpa_frame - build a MPA V1 frame or MPA V2 frame
 517 */
 518static int cm_build_mpa_frame(struct nes_cm_node *cm_node, u8 **start_buff,
 519			      u16 *buff_len, u8 *pci_mem, u8 mpa_key)
 520{
 521	int ret = 0;
 522
 523	*start_buff = (pci_mem) ? pci_mem : &cm_node->mpa_frame_buf[0];
 524
 525	switch (cm_node->mpa_frame_rev) {
 526	case IETF_MPA_V1:
 527		*start_buff = (u8 *)*start_buff + sizeof(struct ietf_rtr_msg);
 528		*buff_len = sizeof(struct ietf_mpa_v1) + cm_node->mpa_frame_size;
 529		build_mpa_v1(cm_node, *start_buff, mpa_key);
 530		break;
 531	case IETF_MPA_V2:
 532		*buff_len = sizeof(struct ietf_mpa_v2) + cm_node->mpa_frame_size;
 533		build_mpa_v2(cm_node, *start_buff, mpa_key);
 534		break;
 535	default:
 536		ret = -EINVAL;
 537	}
 538	return ret;
 539}
 540
 541/**
 542 * build_mpa_v2 - build a MPA V2 frame
 543 */
 544static void build_mpa_v2(struct nes_cm_node *cm_node,
 545			 void *start_addr, u8 mpa_key)
 546{
 547	struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
 548	struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
 549	u16 ctrl_ird;
 550	u16 ctrl_ord;
 551
 552	/* initialize the upper 5 bytes of the frame */
 553	build_mpa_v1(cm_node, start_addr, mpa_key);
 554	mpa_frame->flags |= IETF_MPA_V2_FLAG; /* set a bit to indicate MPA V2 */
 555	mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
 556
 557	/* initialize RTR msg */
 558	ctrl_ird = (cm_node->ird_size > IETF_NO_IRD_ORD) ?
 559			    IETF_NO_IRD_ORD : cm_node->ird_size;
 560	ctrl_ord = (cm_node->ord_size > IETF_NO_IRD_ORD) ?
 561			    IETF_NO_IRD_ORD : cm_node->ord_size;
 562
 563	ctrl_ird |= IETF_PEER_TO_PEER;
 564	ctrl_ird |= IETF_FLPDU_ZERO_LEN;
 565
 566	switch (mpa_key) {
 567	case MPA_KEY_REQUEST:
 568		ctrl_ord |= IETF_RDMA0_WRITE;
 569		ctrl_ord |= IETF_RDMA0_READ;
 570		break;
 571	case MPA_KEY_REPLY:
 572		switch (cm_node->send_rdma0_op) {
 573		case SEND_RDMA_WRITE_ZERO:
 574			ctrl_ord |= IETF_RDMA0_WRITE;
 575			break;
 576		case SEND_RDMA_READ_ZERO:
 577			ctrl_ord |= IETF_RDMA0_READ;
 578			break;
 579		}
 580	}
 581	rtr_msg->ctrl_ird = htons(ctrl_ird);
 582	rtr_msg->ctrl_ord = htons(ctrl_ord);
 583}
 584
 585/**
 586 * build_mpa_v1 - build a MPA V1 frame
 587 */
 588static void build_mpa_v1(struct nes_cm_node *cm_node, void *start_addr, u8 mpa_key)
 589{
 590	struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
 591
 592	switch (mpa_key) {
 593	case MPA_KEY_REQUEST:
 594		memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
 595		break;
 596	case MPA_KEY_REPLY:
 597		memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
 598		break;
 599	}
 600	mpa_frame->flags = IETF_MPA_FLAGS_CRC;
 601	mpa_frame->rev = cm_node->mpa_frame_rev;
 602	mpa_frame->priv_data_len = htons(cm_node->mpa_frame_size);
 603}
 604
 605static void build_rdma0_msg(struct nes_cm_node *cm_node, struct nes_qp **nesqp_addr)
 606{
 607	u64 u64temp;
 608	struct nes_qp *nesqp = *nesqp_addr;
 609	struct nes_hw_qp_wqe *wqe = &nesqp->hwqp.sq_vbase[0];
 610
 611	u64temp = (unsigned long)nesqp;
 612	u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
 613	set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
 614
 615	wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
 616	wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
 617
 618	switch (cm_node->send_rdma0_op) {
 619	case SEND_RDMA_WRITE_ZERO:
 620		nes_debug(NES_DBG_CM, "Sending first write.\n");
 621		wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
 622			cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
 623		wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
 624		wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
 625		wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
 626		break;
 627
 628	case SEND_RDMA_READ_ZERO:
 629	default:
 630		if (cm_node->send_rdma0_op != SEND_RDMA_READ_ZERO) {
 631			printk(KERN_ERR "%s[%u]: Unsupported RDMA0 len operation=%u\n",
 632				 __func__, __LINE__, cm_node->send_rdma0_op);
 633			WARN_ON(1);
 634		}
 635		nes_debug(NES_DBG_CM, "Sending first rdma operation.\n");
 636		wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
 637			cpu_to_le32(NES_IWARP_SQ_OP_RDMAR);
 638		wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_LOW_IDX] = 1;
 639		wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_HIGH_IDX] = 0;
 640		wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_LENGTH_IDX] = 0;
 641		wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_STAG_IDX] = 1;
 642		wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 1;
 643		break;
 644	}
 645
 646	if (nesqp->sq_kmapped) {
 647		nesqp->sq_kmapped = 0;
 648		kunmap(nesqp->page);
 649	}
 650
 651	/*use the reserved spot on the WQ for the extra first WQE*/
 652	nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
 653							     NES_QPCONTEXT_ORDIRD_WRPDU |
 654							     NES_QPCONTEXT_ORDIRD_ALSMM));
 655	nesqp->skip_lsmm = 1;
 656	nesqp->hwqp.sq_tail = 0;
 657}
 658
 659/**
 660 * schedule_nes_timer
 661 * note - cm_node needs to be protected before calling this. Encase in:
 662 *			rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 663 */
 664int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
 665		       enum nes_timer_type type, int send_retrans,
 666		       int close_when_complete)
 667{
 668	unsigned long flags;
 669	struct nes_cm_core *cm_core = cm_node->cm_core;
 670	struct nes_timer_entry *new_send;
 671	int ret = 0;
 672	u32 was_timer_set;
 673
 674	new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
 675	if (!new_send)
 676		return -ENOMEM;
 677
 678	/* new_send->timetosend = currenttime */
 679	new_send->retrycount = NES_DEFAULT_RETRYS;
 680	new_send->retranscount = NES_DEFAULT_RETRANS;
 681	new_send->skb = skb;
 682	new_send->timetosend = jiffies;
 683	new_send->type = type;
 684	new_send->netdev = cm_node->netdev;
 685	new_send->send_retrans = send_retrans;
 686	new_send->close_when_complete = close_when_complete;
 687
 688	if (type == NES_TIMER_TYPE_CLOSE) {
 689		new_send->timetosend += (HZ / 10);
 690		if (cm_node->recv_entry) {
 691			kfree(new_send);
 692			WARN_ON(1);
 693			return -EINVAL;
 694		}
 695		cm_node->recv_entry = new_send;
 696	}
 697
 698	if (type == NES_TIMER_TYPE_SEND) {
 699		new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
 700		atomic_inc(&new_send->skb->users);
 701		spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 702		cm_node->send_entry = new_send;
 703		add_ref_cm_node(cm_node);
 704		spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 705		new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
 706
 707		ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
 708		if (ret != NETDEV_TX_OK) {
 709			nes_debug(NES_DBG_CM, "Error sending packet %p "
 710				  "(jiffies = %lu)\n", new_send, jiffies);
 711			new_send->timetosend = jiffies;
 712			ret = NETDEV_TX_OK;
 713		} else {
 714			cm_packets_sent++;
 715			if (!send_retrans) {
 716				cleanup_retrans_entry(cm_node);
 717				if (close_when_complete)
 718					rem_ref_cm_node(cm_core, cm_node);
 719				return ret;
 720			}
 721		}
 722	}
 723
 724	was_timer_set = timer_pending(&cm_core->tcp_timer);
 725
 726	if (!was_timer_set) {
 727		cm_core->tcp_timer.expires = new_send->timetosend;
 728		add_timer(&cm_core->tcp_timer);
 729	}
 730
 731	return ret;
 732}
 733
 734static void nes_retrans_expired(struct nes_cm_node *cm_node)
 735{
 736	struct iw_cm_id *cm_id = cm_node->cm_id;
 737	enum nes_cm_node_state state = cm_node->state;
 738	cm_node->state = NES_CM_STATE_CLOSED;
 739
 740	switch (state) {
 741	case NES_CM_STATE_SYN_RCVD:
 742	case NES_CM_STATE_CLOSING:
 743		rem_ref_cm_node(cm_node->cm_core, cm_node);
 744		break;
 745	case NES_CM_STATE_LAST_ACK:
 746	case NES_CM_STATE_FIN_WAIT1:
 747		if (cm_node->cm_id)
 748			cm_id->rem_ref(cm_id);
 749		send_reset(cm_node, NULL);
 750		break;
 751	default:
 752		add_ref_cm_node(cm_node);
 753		send_reset(cm_node, NULL);
 754		create_event(cm_node, NES_CM_EVENT_ABORTED);
 755	}
 756}
 757
 758static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
 759{
 760	struct nes_timer_entry *recv_entry = cm_node->recv_entry;
 761	struct iw_cm_id *cm_id = cm_node->cm_id;
 762	struct nes_qp *nesqp;
 763	unsigned long qplockflags;
 764
 765	if (!recv_entry)
 766		return;
 767	nesqp = (struct nes_qp *)recv_entry->skb;
 768	if (nesqp) {
 769		spin_lock_irqsave(&nesqp->lock, qplockflags);
 770		if (nesqp->cm_id) {
 771			nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 772				  "refcount = %d: HIT A "
 773				  "NES_TIMER_TYPE_CLOSE with something "
 774				  "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 775				  atomic_read(&nesqp->refcount));
 776			nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
 777			nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
 778			nesqp->ibqp_state = IB_QPS_ERR;
 779			spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 780			nes_cm_disconn(nesqp);
 781		} else {
 782			spin_unlock_irqrestore(&nesqp->lock, qplockflags);
 783			nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
 784				  "refcount = %d: HIT A "
 785				  "NES_TIMER_TYPE_CLOSE with nothing "
 786				  "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
 787				  atomic_read(&nesqp->refcount));
 788		}
 789	} else if (rem_node) {
 790		/* TIME_WAIT state */
 791		rem_ref_cm_node(cm_node->cm_core, cm_node);
 792	}
 793	if (cm_node->cm_id)
 794		cm_id->rem_ref(cm_id);
 795	kfree(recv_entry);
 796	cm_node->recv_entry = NULL;
 797}
 798
 799/**
 800 * nes_cm_timer_tick
 801 */
 802static void nes_cm_timer_tick(unsigned long pass)
 803{
 804	unsigned long flags;
 805	unsigned long nexttimeout = jiffies + NES_LONG_TIME;
 806	struct nes_cm_node *cm_node;
 807	struct nes_timer_entry *send_entry, *recv_entry;
 808	struct list_head *list_core_temp;
 809	struct list_head *list_node;
 810	struct nes_cm_core *cm_core = g_cm_core;
 811	u32 settimer = 0;
 812	unsigned long timetosend;
 813	int ret = NETDEV_TX_OK;
 814
 815	struct list_head timer_list;
 816
 817	INIT_LIST_HEAD(&timer_list);
 818	spin_lock_irqsave(&cm_core->ht_lock, flags);
 819
 820	list_for_each_safe(list_node, list_core_temp,
 821			   &cm_core->connected_nodes) {
 822		cm_node = container_of(list_node, struct nes_cm_node, list);
 823		if ((cm_node->recv_entry) || (cm_node->send_entry)) {
 824			add_ref_cm_node(cm_node);
 825			list_add(&cm_node->timer_entry, &timer_list);
 826		}
 827	}
 828	spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 829
 830	list_for_each_safe(list_node, list_core_temp, &timer_list) {
 831		cm_node = container_of(list_node, struct nes_cm_node,
 832				       timer_entry);
 833		recv_entry = cm_node->recv_entry;
 834
 835		if (recv_entry) {
 836			if (time_after(recv_entry->timetosend, jiffies)) {
 837				if (nexttimeout > recv_entry->timetosend ||
 838				    !settimer) {
 839					nexttimeout = recv_entry->timetosend;
 840					settimer = 1;
 841				}
 842			} else {
 843				handle_recv_entry(cm_node, 1);
 844			}
 845		}
 846
 847		spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 848		do {
 849			send_entry = cm_node->send_entry;
 850			if (!send_entry)
 851				break;
 852			if (time_after(send_entry->timetosend, jiffies)) {
 853				if (cm_node->state != NES_CM_STATE_TSA) {
 854					if ((nexttimeout >
 855					     send_entry->timetosend) ||
 856					    !settimer) {
 857						nexttimeout =
 858							send_entry->timetosend;
 859						settimer = 1;
 860					}
 861				} else {
 862					free_retrans_entry(cm_node);
 863				}
 864				break;
 865			}
 866
 867			if ((cm_node->state == NES_CM_STATE_TSA) ||
 868			    (cm_node->state == NES_CM_STATE_CLOSED)) {
 869				free_retrans_entry(cm_node);
 870				break;
 871			}
 872
 873			if (!send_entry->retranscount ||
 874			    !send_entry->retrycount) {
 875				cm_packets_dropped++;
 876				free_retrans_entry(cm_node);
 877
 878				spin_unlock_irqrestore(
 879					&cm_node->retrans_list_lock, flags);
 880				nes_retrans_expired(cm_node);
 881				cm_node->state = NES_CM_STATE_CLOSED;
 882				spin_lock_irqsave(&cm_node->retrans_list_lock,
 883						  flags);
 884				break;
 885			}
 886			atomic_inc(&send_entry->skb->users);
 887			cm_packets_retrans++;
 888			nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
 889				  "for node %p, jiffies = %lu, time to send = "
 890				  "%lu, retranscount = %u, send_entry->seq_num = "
 891				  "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
 892				  "0x%08X\n", send_entry, cm_node, jiffies,
 893				  send_entry->timetosend,
 894				  send_entry->retranscount,
 895				  send_entry->seq_num,
 896				  cm_node->tcp_cntxt.rem_ack_num);
 897
 898			spin_unlock_irqrestore(&cm_node->retrans_list_lock,
 899					       flags);
 900			ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
 901			spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 902			if (ret != NETDEV_TX_OK) {
 903				nes_debug(NES_DBG_CM, "rexmit failed for "
 904					  "node=%p\n", cm_node);
 905				cm_packets_bounced++;
 906				send_entry->retrycount--;
 907				nexttimeout = jiffies + NES_SHORT_TIME;
 908				settimer = 1;
 909				break;
 910			} else {
 911				cm_packets_sent++;
 912			}
 913			nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
 914				  "%u, retry count = %u.\n",
 915				  send_entry->retranscount,
 916				  send_entry->retrycount);
 917			if (send_entry->send_retrans) {
 918				send_entry->retranscount--;
 919				timetosend = (NES_RETRY_TIMEOUT <<
 920					      (NES_DEFAULT_RETRANS - send_entry->retranscount));
 921
 922				send_entry->timetosend = jiffies +
 923							 min(timetosend, NES_MAX_TIMEOUT);
 924				if (nexttimeout > send_entry->timetosend ||
 925				    !settimer) {
 926					nexttimeout = send_entry->timetosend;
 927					settimer = 1;
 928				}
 929			} else {
 930				int close_when_complete;
 931				close_when_complete =
 932					send_entry->close_when_complete;
 933				nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
 934					  cm_node, cm_node->state);
 935				free_retrans_entry(cm_node);
 936				if (close_when_complete)
 937					rem_ref_cm_node(cm_node->cm_core,
 938							cm_node);
 939			}
 940		} while (0);
 941
 942		spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 943		rem_ref_cm_node(cm_node->cm_core, cm_node);
 944	}
 945
 946	if (settimer) {
 947		if (!timer_pending(&cm_core->tcp_timer)) {
 948			cm_core->tcp_timer.expires = nexttimeout;
 949			add_timer(&cm_core->tcp_timer);
 950		}
 951	}
 952}
 953
 954
 955/**
 956 * send_syn
 957 */
 958static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
 959		    struct sk_buff *skb)
 960{
 961	int ret;
 962	int flags = SET_SYN;
 963	char optionsbuffer[sizeof(struct option_mss) +
 964			   sizeof(struct option_windowscale) + sizeof(struct option_base) +
 965			   TCP_OPTIONS_PADDING];
 966
 967	int optionssize = 0;
 968	/* Sending MSS option */
 969	union all_known_options *options;
 970
 971	if (!cm_node)
 972		return -EINVAL;
 973
 974	options = (union all_known_options *)&optionsbuffer[optionssize];
 975	options->as_mss.optionnum = OPTION_NUMBER_MSS;
 976	options->as_mss.length = sizeof(struct option_mss);
 977	options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
 978	optionssize += sizeof(struct option_mss);
 979
 980	options = (union all_known_options *)&optionsbuffer[optionssize];
 981	options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
 982	options->as_windowscale.length = sizeof(struct option_windowscale);
 983	options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
 984	optionssize += sizeof(struct option_windowscale);
 985
 986	if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
 987		options = (union all_known_options *)&optionsbuffer[optionssize];
 988		options->as_base.optionnum = OPTION_NUMBER_WRITE0;
 989		options->as_base.length = sizeof(struct option_base);
 990		optionssize += sizeof(struct option_base);
 991		/* we need the size to be a multiple of 4 */
 992		options = (union all_known_options *)&optionsbuffer[optionssize];
 993		options->as_end = 1;
 994		optionssize += 1;
 995		options = (union all_known_options *)&optionsbuffer[optionssize];
 996		options->as_end = 1;
 997		optionssize += 1;
 998	}
 999
1000	options = (union all_known_options *)&optionsbuffer[optionssize];
1001	options->as_end = OPTION_NUMBER_END;
1002	optionssize += 1;
1003
1004	if (!skb)
1005		skb = dev_alloc_skb(MAX_CM_BUFFER);
1006	if (!skb) {
1007		nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1008		return -1;
1009	}
1010
1011	if (sendack)
1012		flags |= SET_ACK;
1013
1014	form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
1015	ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1016
1017	return ret;
1018}
1019
1020
1021/**
1022 * send_reset
1023 */
1024static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
1025{
1026	int ret;
1027	int flags = SET_RST | SET_ACK;
1028
1029	if (!skb)
1030		skb = dev_alloc_skb(MAX_CM_BUFFER);
1031	if (!skb) {
1032		nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1033		return -ENOMEM;
1034	}
1035
1036	form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
1037	ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
1038
1039	return ret;
1040}
1041
1042
1043/**
1044 * send_ack
1045 */
1046static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
1047{
1048	int ret;
1049
1050	if (!skb)
1051		skb = dev_alloc_skb(MAX_CM_BUFFER);
1052
1053	if (!skb) {
1054		nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1055		return -1;
1056	}
1057
1058	form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
1059	ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
1060
1061	return ret;
1062}
1063
1064
1065/**
1066 * send_fin
1067 */
1068static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
1069{
1070	int ret;
1071
1072	/* if we didn't get a frame get one */
1073	if (!skb)
1074		skb = dev_alloc_skb(MAX_CM_BUFFER);
1075
1076	if (!skb) {
1077		nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1078		return -1;
1079	}
1080
1081	form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
1082	ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1083
1084	return ret;
1085}
1086
1087
1088/**
1089 * find_node - find a cm node that matches the reference cm node
1090 */
1091static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
1092				     u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
1093{
1094	unsigned long flags;
1095	struct list_head *hte;
1096	struct nes_cm_node *cm_node;
1097
1098	/* get a handle on the hte */
1099	hte = &cm_core->connected_nodes;
1100
1101	/* walk list and find cm_node associated with this session ID */
1102	spin_lock_irqsave(&cm_core->ht_lock, flags);
1103	list_for_each_entry(cm_node, hte, list) {
1104		/* compare quad, return node handle if a match */
1105		nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
1106			  cm_node->loc_addr, cm_node->loc_port,
1107			  loc_addr, loc_port,
1108			  cm_node->rem_addr, cm_node->rem_port,
1109			  rem_addr, rem_port);
1110		if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
1111		    (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
1112			add_ref_cm_node(cm_node);
1113			spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1114			return cm_node;
1115		}
1116	}
1117	spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1118
1119	/* no owner node */
1120	return NULL;
1121}
1122
1123
1124/**
1125 * find_listener - find a cm node listening on this addr-port pair
1126 */
1127static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
1128					     nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
1129{
1130	unsigned long flags;
1131	struct nes_cm_listener *listen_node;
1132
1133	/* walk list and find cm_node associated with this session ID */
1134	spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1135	list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
1136		/* compare node pair, return node handle if a match */
1137		if (((listen_node->loc_addr == dst_addr) ||
1138		     listen_node->loc_addr == 0x00000000) &&
1139		    (listen_node->loc_port == dst_port) &&
1140		    (listener_state & listen_node->listener_state)) {
1141			atomic_inc(&listen_node->ref_count);
1142			spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1143			return listen_node;
1144		}
1145	}
1146	spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1147
1148	/* no listener */
1149	return NULL;
1150}
1151
1152
1153/**
1154 * add_hte_node - add a cm node to the hash table
1155 */
1156static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1157{
1158	unsigned long flags;
1159	struct list_head *hte;
1160
1161	if (!cm_node || !cm_core)
1162		return -EINVAL;
1163
1164	nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
1165		  cm_node);
1166
1167	spin_lock_irqsave(&cm_core->ht_lock, flags);
1168
1169	/* get a handle on the hash table element (list head for this slot) */
1170	hte = &cm_core->connected_nodes;
1171	list_add_tail(&cm_node->list, hte);
1172	atomic_inc(&cm_core->ht_node_cnt);
1173
1174	spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1175
1176	return 0;
1177}
1178
1179
1180/**
1181 * mini_cm_dec_refcnt_listen
1182 */
1183static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
1184				     struct nes_cm_listener *listener, int free_hanging_nodes)
1185{
1186	int ret = -EINVAL;
1187	int err = 0;
1188	unsigned long flags;
1189	struct list_head *list_pos = NULL;
1190	struct list_head *list_temp = NULL;
1191	struct nes_cm_node *cm_node = NULL;
1192	struct list_head reset_list;
1193
1194	nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
1195		  "refcnt=%d\n", listener, free_hanging_nodes,
1196		  atomic_read(&listener->ref_count));
1197	/* free non-accelerated child nodes for this listener */
1198	INIT_LIST_HEAD(&reset_list);
1199	if (free_hanging_nodes) {
1200		spin_lock_irqsave(&cm_core->ht_lock, flags);
1201		list_for_each_safe(list_pos, list_temp,
1202				   &g_cm_core->connected_nodes) {
1203			cm_node = container_of(list_pos, struct nes_cm_node,
1204					       list);
1205			if ((cm_node->listener == listener) &&
1206			    (!cm_node->accelerated)) {
1207				add_ref_cm_node(cm_node);
1208				list_add(&cm_node->reset_entry, &reset_list);
1209			}
1210		}
1211		spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1212	}
1213
1214	list_for_each_safe(list_pos, list_temp, &reset_list) {
1215		cm_node = container_of(list_pos, struct nes_cm_node,
1216				       reset_entry);
1217		{
1218			struct nes_cm_node *loopback = cm_node->loopbackpartner;
1219			enum nes_cm_node_state old_state;
1220			if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
1221				rem_ref_cm_node(cm_node->cm_core, cm_node);
1222			} else {
1223				if (!loopback) {
1224					cleanup_retrans_entry(cm_node);
1225					err = send_reset(cm_node, NULL);
1226					if (err) {
1227						cm_node->state =
1228							NES_CM_STATE_CLOSED;
1229						WARN_ON(1);
1230					} else {
1231						old_state = cm_node->state;
1232						cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1233						if (old_state != NES_CM_STATE_MPAREQ_RCVD)
1234							rem_ref_cm_node(
1235								cm_node->cm_core,
1236								cm_node);
1237					}
1238				} else {
1239					struct nes_cm_event event;
1240
1241					event.cm_node = loopback;
1242					event.cm_info.rem_addr =
1243							loopback->rem_addr;
1244					event.cm_info.loc_addr =
1245							loopback->loc_addr;
1246					event.cm_info.rem_port =
1247							loopback->rem_port;
1248					event.cm_info.loc_port =
1249							 loopback->loc_port;
1250					event.cm_info.cm_id = loopback->cm_id;
1251					add_ref_cm_node(loopback);
1252					loopback->state = NES_CM_STATE_CLOSED;
1253					cm_event_connect_error(&event);
1254					cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1255
1256					rem_ref_cm_node(cm_node->cm_core,
1257							 cm_node);
1258
1259				}
1260			}
1261		}
1262	}
1263
1264	spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1265	if (!atomic_dec_return(&listener->ref_count)) {
1266		list_del(&listener->list);
1267
1268		/* decrement our listen node count */
1269		atomic_dec(&cm_core->listen_node_cnt);
1270
1271		spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1272
1273		if (listener->nesvnic)
1274			nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1275					 PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1276
1277		nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1278
1279		kfree(listener);
1280		listener = NULL;
1281		ret = 0;
1282		atomic_inc(&cm_listens_destroyed);
1283	} else {
1284		spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1285	}
1286	if (listener) {
1287		if (atomic_read(&listener->pend_accepts_cnt) > 0)
1288			nes_debug(NES_DBG_CM, "destroying listener (%p)"
1289				  " with non-zero pending accepts=%u\n",
1290				  listener, atomic_read(&listener->pend_accepts_cnt));
1291	}
1292
1293	return ret;
1294}
1295
1296
1297/**
1298 * mini_cm_del_listen
1299 */
1300static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1301			      struct nes_cm_listener *listener)
1302{
1303	listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1304	listener->cm_id = NULL; /* going to be destroyed pretty soon */
1305	return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1306}
1307
1308
1309/**
1310 * mini_cm_accelerated
1311 */
1312static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1313				      struct nes_cm_node *cm_node)
1314{
1315	u32 was_timer_set;
1316
1317	cm_node->accelerated = 1;
1318
1319	if (cm_node->accept_pend) {
1320		BUG_ON(!cm_node->listener);
1321		atomic_dec(&cm_node->listener->pend_accepts_cnt);
1322		cm_node->accept_pend = 0;
1323		BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1324	}
1325
1326	was_timer_set = timer_pending(&cm_core->tcp_timer);
1327	if (!was_timer_set) {
1328		cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1329		add_timer(&cm_core->tcp_timer);
1330	}
1331
1332	return 0;
1333}
1334
1335
1336/**
1337 * nes_addr_resolve_neigh
1338 */
1339static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1340{
1341	struct rtable *rt;
1342	struct neighbour *neigh;
1343	int rc = arpindex;
1344	struct net_device *netdev;
1345	struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1346
1347	rt = ip_route_output(&init_net, htonl(dst_ip), 0, 0, 0);
1348	if (IS_ERR(rt)) {
1349		printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1350		       __func__, dst_ip);
1351		return rc;
1352	}
1353
1354	if (netif_is_bond_slave(nesvnic->netdev))
1355		netdev = nesvnic->netdev->master;
1356	else
1357		netdev = nesvnic->netdev;
1358
1359	neigh = dst_neigh_lookup(&rt->dst, &dst_ip);
1360
1361	rcu_read_lock();
1362	if (neigh) {
1363		if (neigh->nud_state & NUD_VALID) {
1364			nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1365				  " is %pM, Gateway is 0x%08X \n", dst_ip,
1366				  neigh->ha, ntohl(rt->rt_gateway));
1367
1368			if (arpindex >= 0) {
1369				if (!memcmp(nesadapter->arp_table[arpindex].mac_addr,
1370					    neigh->ha, ETH_ALEN)) {
1371					/* Mac address same as in nes_arp_table */
1372					goto out;
1373				}
1374
1375				nes_manage_arp_cache(nesvnic->netdev,
1376						     nesadapter->arp_table[arpindex].mac_addr,
1377						     dst_ip, NES_ARP_DELETE);
1378			}
1379
1380			nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1381					     dst_ip, NES_ARP_ADD);
1382			rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1383					   NES_ARP_RESOLVE);
1384		} else {
1385			neigh_event_send(neigh, NULL);
1386		}
1387	}
1388out:
1389	rcu_read_unlock();
1390
1391	if (neigh)
1392		neigh_release(neigh);
1393
1394	ip_rt_put(rt);
1395	return rc;
1396}
1397
1398/**
1399 * make_cm_node - create a new instance of a cm node
1400 */
1401static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1402					struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1403					struct nes_cm_listener *listener)
1404{
1405	struct nes_cm_node *cm_node;
1406	struct timespec ts;
1407	int oldarpindex = 0;
1408	int arpindex = 0;
1409	struct nes_device *nesdev;
1410	struct nes_adapter *nesadapter;
1411
1412	/* create an hte and cm_node for this instance */
1413	cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1414	if (!cm_node)
1415		return NULL;
1416
1417	/* set our node specific transport info */
1418	cm_node->loc_addr = cm_info->loc_addr;
1419	cm_node->rem_addr = cm_info->rem_addr;
1420	cm_node->loc_port = cm_info->loc_port;
1421	cm_node->rem_port = cm_info->rem_port;
1422
1423	cm_node->mpa_frame_rev = mpa_version;
1424	cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
1425	cm_node->ird_size = IETF_NO_IRD_ORD;
1426	cm_node->ord_size = IETF_NO_IRD_ORD;
1427
1428	nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1429		  &cm_node->loc_addr, cm_node->loc_port,
1430		  &cm_node->rem_addr, cm_node->rem_port);
1431	cm_node->listener = listener;
1432	cm_node->netdev = nesvnic->netdev;
1433	cm_node->cm_id = cm_info->cm_id;
1434	memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1435
1436	nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1437		  cm_node->cm_id);
1438
1439	spin_lock_init(&cm_node->retrans_list_lock);
1440
1441	cm_node->loopbackpartner = NULL;
1442	atomic_set(&cm_node->ref_count, 1);
1443	/* associate our parent CM core */
1444	cm_node->cm_core = cm_core;
1445	cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1446	cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1447	cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1448				     NES_CM_DEFAULT_RCV_WND_SCALE;
1449	ts = current_kernel_time();
1450	cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1451	cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1452				 sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1453	cm_node->tcp_cntxt.rcv_nxt = 0;
1454	/* get a unique session ID , add thread_id to an upcounter to handle race */
1455	atomic_inc(&cm_core->node_cnt);
1456	cm_node->conn_type = cm_info->conn_type;
1457	cm_node->apbvt_set = 0;
1458	cm_node->accept_pend = 0;
1459
1460	cm_node->nesvnic = nesvnic;
1461	/* get some device handles, for arp lookup */
1462	nesdev = nesvnic->nesdev;
1463	nesadapter = nesdev->nesadapter;
1464
1465	cm_node->loopbackpartner = NULL;
1466
1467	/* get the mac addr for the remote node */
1468	if (ipv4_is_loopback(htonl(cm_node->rem_addr))) {
1469		arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1470	} else {
1471		oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1472		arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr, oldarpindex);
1473	}
1474	if (arpindex < 0) {
1475		kfree(cm_node);
1476		return NULL;
1477	}
1478
1479	/* copy the mac addr to node context */
1480	memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1481	nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1482		  cm_node->rem_mac);
1483
1484	add_hte_node(cm_core, cm_node);
1485	atomic_inc(&cm_nodes_created);
1486
1487	return cm_node;
1488}
1489
1490
1491/**
1492 * add_ref_cm_node - destroy an instance of a cm node
1493 */
1494static int add_ref_cm_node(struct nes_cm_node *cm_node)
1495{
1496	atomic_inc(&cm_node->ref_count);
1497	return 0;
1498}
1499
1500
1501/**
1502 * rem_ref_cm_node - destroy an instance of a cm node
1503 */
1504static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1505			   struct nes_cm_node *cm_node)
1506{
1507	unsigned long flags;
1508	struct nes_qp *nesqp;
1509
1510	if (!cm_node)
1511		return -EINVAL;
1512
1513	spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1514	if (atomic_dec_return(&cm_node->ref_count)) {
1515		spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1516		return 0;
1517	}
1518	list_del(&cm_node->list);
1519	atomic_dec(&cm_core->ht_node_cnt);
1520	spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1521
1522	/* if the node is destroyed before connection was accelerated */
1523	if (!cm_node->accelerated && cm_node->accept_pend) {
1524		BUG_ON(!cm_node->listener);
1525		atomic_dec(&cm_node->listener->pend_accepts_cnt);
1526		BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1527	}
1528	WARN_ON(cm_node->send_entry);
1529	if (cm_node->recv_entry)
1530		handle_recv_entry(cm_node, 0);
1531	if (cm_node->listener) {
1532		mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1533	} else {
1534		if (cm_node->apbvt_set && cm_node->nesvnic) {
1535			nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1536					 PCI_FUNC(
1537						 cm_node->nesvnic->nesdev->pcidev->devfn),
1538					 NES_MANAGE_APBVT_DEL);
1539		}
1540	}
1541
1542	atomic_dec(&cm_core->node_cnt);
1543	atomic_inc(&cm_nodes_destroyed);
1544	nesqp = cm_node->nesqp;
1545	if (nesqp) {
1546		nesqp->cm_node = NULL;
1547		nes_rem_ref(&nesqp->ibqp);
1548		cm_node->nesqp = NULL;
1549	}
1550
1551	kfree(cm_node);
1552	return 0;
1553}
1554
1555/**
1556 * process_options
1557 */
1558static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1559			   u32 optionsize, u32 syn_packet)
1560{
1561	u32 tmp;
1562	u32 offset = 0;
1563	union all_known_options *all_options;
1564	char got_mss_option = 0;
1565
1566	while (offset < optionsize) {
1567		all_options = (union all_known_options *)(optionsloc + offset);
1568		switch (all_options->as_base.optionnum) {
1569		case OPTION_NUMBER_END:
1570			offset = optionsize;
1571			break;
1572		case OPTION_NUMBER_NONE:
1573			offset += 1;
1574			continue;
1575		case OPTION_NUMBER_MSS:
1576			nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1577				  "Size: %d\n", __func__,
1578				  all_options->as_mss.length, offset, optionsize);
1579			got_mss_option = 1;
1580			if (all_options->as_mss.length != 4) {
1581				return 1;
1582			} else {
1583				tmp = ntohs(all_options->as_mss.mss);
1584				if (tmp > 0 && tmp <
1585				    cm_node->tcp_cntxt.mss)
1586					cm_node->tcp_cntxt.mss = tmp;
1587			}
1588			break;
1589		case OPTION_NUMBER_WINDOW_SCALE:
1590			cm_node->tcp_cntxt.snd_wscale =
1591				all_options->as_windowscale.shiftcount;
1592			break;
1593		default:
1594			nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1595				  all_options->as_base.optionnum);
1596			break;
1597		}
1598		offset += all_options->as_base.length;
1599	}
1600	if ((!got_mss_option) && (syn_packet))
1601		cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1602	return 0;
1603}
1604
1605static void drop_packet(struct sk_buff *skb)
1606{
1607	atomic_inc(&cm_accel_dropped_pkts);
1608	dev_kfree_skb_any(skb);
1609}
1610
1611static void handle_fin_pkt(struct nes_cm_node *cm_node)
1612{
1613	nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1614		  "refcnt=%d\n", cm_node, cm_node->state,
1615		  atomic_read(&cm_node->ref_count));
1616	switch (cm_node->state) {
1617	case NES_CM_STATE_SYN_RCVD:
1618	case NES_CM_STATE_SYN_SENT:
1619	case NES_CM_STATE_ESTABLISHED:
1620	case NES_CM_STATE_MPAREJ_RCVD:
1621		cm_node->tcp_cntxt.rcv_nxt++;
1622		cleanup_retrans_entry(cm_node);
1623		cm_node->state = NES_CM_STATE_LAST_ACK;
1624		send_fin(cm_node, NULL);
1625		break;
1626	case NES_CM_STATE_MPAREQ_SENT:
1627		create_event(cm_node, NES_CM_EVENT_ABORTED);
1628		cm_node->tcp_cntxt.rcv_nxt++;
1629		cleanup_retrans_entry(cm_node);
1630		cm_node->state = NES_CM_STATE_CLOSED;
1631		add_ref_cm_node(cm_node);
1632		send_reset(cm_node, NULL);
1633		break;
1634	case NES_CM_STATE_FIN_WAIT1:
1635		cm_node->tcp_cntxt.rcv_nxt++;
1636		cleanup_retrans_entry(cm_node);
1637		cm_node->state = NES_CM_STATE_CLOSING;
1638		send_ack(cm_node, NULL);
1639		/* Wait for ACK as this is simultaneous close..
1640		* After we receive ACK, do not send anything..
1641		* Just rm the node.. Done.. */
1642		break;
1643	case NES_CM_STATE_FIN_WAIT2:
1644		cm_node->tcp_cntxt.rcv_nxt++;
1645		cleanup_retrans_entry(cm_node);
1646		cm_node->state = NES_CM_STATE_TIME_WAIT;
1647		send_ack(cm_node, NULL);
1648		schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1649		break;
1650	case NES_CM_STATE_TIME_WAIT:
1651		cm_node->tcp_cntxt.rcv_nxt++;
1652		cleanup_retrans_entry(cm_node);
1653		cm_node->state = NES_CM_STATE_CLOSED;
1654		rem_ref_cm_node(cm_node->cm_core, cm_node);
1655		break;
1656	case NES_CM_STATE_TSA:
1657	default:
1658		nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1659			cm_node, cm_node->state);
1660		break;
1661	}
1662}
1663
1664
1665static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1666	struct tcphdr *tcph)
1667{
1668
1669	int	reset = 0;	/* whether to send reset in case of err.. */
1670	atomic_inc(&cm_resets_recvd);
1671	nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1672			" refcnt=%d\n", cm_node, cm_node->state,
1673			atomic_read(&cm_node->ref_count));
1674	cleanup_retrans_entry(cm_node);
1675	switch (cm_node->state) {
1676	case NES_CM_STATE_SYN_SENT:
1677	case NES_CM_STATE_MPAREQ_SENT:
1678		nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1679			"listener=%p state=%d\n", __func__, __LINE__, cm_node,
1680			cm_node->listener, cm_node->state);
1681		switch (cm_node->mpa_frame_rev) {
1682		case IETF_MPA_V2:
1683			cm_node->mpa_frame_rev = IETF_MPA_V1;
1684			/* send a syn and goto syn sent state */
1685			cm_node->state = NES_CM_STATE_SYN_SENT;
1686			if (send_syn(cm_node, 0, NULL)) {
1687				active_open_err(cm_node, skb, reset);
1688			}
1689			break;
1690		case IETF_MPA_V1:
1691		default:
1692			active_open_err(cm_node, skb, reset);
1693			break;
1694		}
1695		break;
1696	case NES_CM_STATE_MPAREQ_RCVD:
1697		atomic_inc(&cm_node->passive_state);
1698		dev_kfree_skb_any(skb);
1699		break;
1700	case NES_CM_STATE_ESTABLISHED:
1701	case NES_CM_STATE_SYN_RCVD:
1702	case NES_CM_STATE_LISTENING:
1703		nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1704		passive_open_err(cm_node, skb, reset);
1705		break;
1706	case NES_CM_STATE_TSA:
1707		active_open_err(cm_node, skb, reset);
1708		break;
1709	case NES_CM_STATE_CLOSED:
1710		drop_packet(skb);
1711		break;
1712	case NES_CM_STATE_FIN_WAIT2:
1713	case NES_CM_STATE_FIN_WAIT1:
1714	case NES_CM_STATE_LAST_ACK:
1715		cm_node->cm_id->rem_ref(cm_node->cm_id);
1716	case NES_CM_STATE_TIME_WAIT:
1717		cm_node->state = NES_CM_STATE_CLOSED;
1718		rem_ref_cm_node(cm_node->cm_core, cm_node);
1719		drop_packet(skb);
1720		break;
1721	default:
1722		drop_packet(skb);
1723		break;
1724	}
1725}
1726
1727
1728static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1729{
1730	int ret = 0;
1731	int datasize = skb->len;
1732	u8 *dataloc = skb->data;
1733
1734	enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1735	u32 res_type;
1736
1737	ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1738	if (ret) {
1739		nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1740		if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1741			nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1742				  "cm_node=%p listener=%p state=%d\n", __func__,
1743				  __LINE__, cm_node, cm_node->listener,
1744				  cm_node->state);
1745			active_open_err(cm_node, skb, 1);
1746		} else {
1747			passive_open_err(cm_node, skb, 1);
1748		}
1749		return;
1750	}
1751
1752	switch (cm_node->state) {
1753	case NES_CM_STATE_ESTABLISHED:
1754		if (res_type == NES_MPA_REQUEST_REJECT)
1755			/*BIG problem as we are receiving the MPA.. So should
1756			 * not be REJECT.. This is Passive Open.. We can
1757			 * only receive it Reject for Active Open...*/
1758			WARN_ON(1);
1759		cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1760		type = NES_CM_EVENT_MPA_REQ;
1761		atomic_set(&cm_node->passive_state,
1762			   NES_PASSIVE_STATE_INDICATED);
1763		break;
1764	case NES_CM_STATE_MPAREQ_SENT:
1765		cleanup_retrans_entry(cm_node);
1766		if (res_type == NES_MPA_REQUEST_REJECT) {
1767			type = NES_CM_EVENT_MPA_REJECT;
1768			cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1769		} else {
1770			type = NES_CM_EVENT_CONNECTED;
1771			cm_node->state = NES_CM_STATE_TSA;
1772		}
1773
1774		break;
1775	default:
1776		WARN_ON(1);
1777		break;
1778	}
1779	dev_kfree_skb_any(skb);
1780	create_event(cm_node, type);
1781}
1782
1783static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1784{
1785	switch (cm_node->state) {
1786	case NES_CM_STATE_SYN_SENT:
1787	case NES_CM_STATE_MPAREQ_SENT:
1788		nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1789			  "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1790			  cm_node->listener, cm_node->state);
1791		active_open_err(cm_node, skb, 1);
1792		break;
1793	case NES_CM_STATE_ESTABLISHED:
1794	case NES_CM_STATE_SYN_RCVD:
1795		passive_open_err(cm_node, skb, 1);
1796		break;
1797	case NES_CM_STATE_TSA:
1798	default:
1799		drop_packet(skb);
1800	}
1801}
1802
1803static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1804		     struct sk_buff *skb)
1805{
1806	int err;
1807
1808	err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num)) ? 0 : 1;
1809	if (err)
1810		active_open_err(cm_node, skb, 1);
1811
1812	return err;
1813}
1814
1815static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1816		     struct sk_buff *skb)
1817{
1818	int err = 0;
1819	u32 seq;
1820	u32 ack_seq;
1821	u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1822	u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1823	u32 rcv_wnd;
1824
1825	seq = ntohl(tcph->seq);
1826	ack_seq = ntohl(tcph->ack_seq);
1827	rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1828	if (ack_seq != loc_seq_num)
1829		err = 1;
1830	else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
1831		err = 1;
1832	if (err) {
1833		nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1834			  "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1835			  cm_node->listener, cm_node->state);
1836		indicate_pkt_err(cm_node, skb);
1837		nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1838			  "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1839			  rcv_wnd);
1840	}
1841	return err;
1842}
1843
1844/*
1845 * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1846 * is created with a listener or it may comein as rexmitted packet which in
1847 * that case will be just dropped.
1848 */
1849static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1850			   struct tcphdr *tcph)
1851{
1852	int ret;
1853	u32 inc_sequence;
1854	int optionsize;
1855
1856	optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1857	skb_trim(skb, 0);
1858	inc_sequence = ntohl(tcph->seq);
1859
1860	switch (cm_node->state) {
1861	case NES_CM_STATE_SYN_SENT:
1862	case NES_CM_STATE_MPAREQ_SENT:
1863		/* Rcvd syn on active open connection*/
1864		active_open_err(cm_node, skb, 1);
1865		break;
1866	case NES_CM_STATE_LISTENING:
1867		/* Passive OPEN */
1868		if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1869		    cm_node->listener->backlog) {
1870			nes_debug(NES_DBG_CM, "drop syn due to backlog "
1871				  "pressure \n");
1872			cm_backlog_drops++;
1873			passive_open_err(cm_node, skb, 0);
1874			break;
1875		}
1876		ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1877					 1);
1878		if (ret) {
1879			passive_open_err(cm_node, skb, 0);
1880			/* drop pkt */
1881			break;
1882		}
1883		cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1884		BUG_ON(cm_node->send_entry);
1885		cm_node->accept_pend = 1;
1886		atomic_inc(&cm_node->listener->pend_accepts_cnt);
1887
1888		cm_node->state = NES_CM_STATE_SYN_RCVD;
1889		send_syn(cm_node, 1, skb);
1890		break;
1891	case NES_CM_STATE_CLOSED:
1892		cleanup_retrans_entry(cm_node);
1893		add_ref_cm_node(cm_node);
1894		send_reset(cm_node, skb);
1895		break;
1896	case NES_CM_STATE_TSA:
1897	case NES_CM_STATE_ESTABLISHED:
1898	case NES_CM_STATE_FIN_WAIT1:
1899	case NES_CM_STATE_FIN_WAIT2:
1900	case NES_CM_STATE_MPAREQ_RCVD:
1901	case NES_CM_STATE_LAST_ACK:
1902	case NES_CM_STATE_CLOSING:
1903	case NES_CM_STATE_UNKNOWN:
1904	default:
1905		drop_packet(skb);
1906		break;
1907	}
1908}
1909
1910static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1911			      struct tcphdr *tcph)
1912{
1913	int ret;
1914	u32 inc_sequence;
1915	int optionsize;
1916
1917	optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1918	skb_trim(skb, 0);
1919	inc_sequence = ntohl(tcph->seq);
1920	switch (cm_node->state) {
1921	case NES_CM_STATE_SYN_SENT:
1922		cleanup_retrans_entry(cm_node);
1923		/* active open */
1924		if (check_syn(cm_node, tcph, skb))
1925			return;
1926		cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1927		/* setup options */
1928		ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1929		if (ret) {
1930			nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1931				  cm_node);
1932			break;
1933		}
1934		cleanup_retrans_entry(cm_node);
1935		cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1936		send_mpa_request(cm_node, skb);
1937		cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1938		break;
1939	case NES_CM_STATE_MPAREQ_RCVD:
1940		/* passive open, so should not be here */
1941		passive_open_err(cm_node, skb, 1);
1942		break;
1943	case NES_CM_STATE_LISTENING:
1944		cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1945		cleanup_retrans_entry(cm_node);
1946		cm_node->state = NES_CM_STATE_CLOSED;
1947		send_reset(cm_node, skb);
1948		break;
1949	case NES_CM_STATE_CLOSED:
1950		cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1951		cleanup_retrans_entry(cm_node);
1952		add_ref_cm_node(cm_node);
1953		send_reset(cm_node, skb);
1954		break;
1955	case NES_CM_STATE_ESTABLISHED:
1956	case NES_CM_STATE_FIN_WAIT1:
1957	case NES_CM_STATE_FIN_WAIT2:
1958	case NES_CM_STATE_LAST_ACK:
1959	case NES_CM_STATE_TSA:
1960	case NES_CM_STATE_CLOSING:
1961	case NES_CM_STATE_UNKNOWN:
1962	case NES_CM_STATE_MPAREQ_SENT:
1963	default:
1964		drop_packet(skb);
1965		break;
1966	}
1967}
1968
1969static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1970			  struct tcphdr *tcph)
1971{
1972	int datasize = 0;
1973	u32 inc_sequence;
1974	int ret = 0;
1975	int optionsize;
1976
1977	optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1978
1979	if (check_seq(cm_node, tcph, skb))
1980		return -EINVAL;
1981
1982	skb_pull(skb, tcph->doff << 2);
1983	inc_sequence = ntohl(tcph->seq);
1984	datasize = skb->len;
1985	switch (cm_node->state) {
1986	case NES_CM_STATE_SYN_RCVD:
1987		/* Passive OPEN */
1988		cleanup_retrans_entry(cm_node);
1989		ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1990		if (ret)
1991			break;
1992		cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1993		cm_node->state = NES_CM_STATE_ESTABLISHED;
1994		if (datasize) {
1995			cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1996			handle_rcv_mpa(cm_node, skb);
1997		} else { /* rcvd ACK only */
1998			dev_kfree_skb_any(skb);
1999		}
2000		break;
2001	case NES_CM_STATE_ESTABLISHED:
2002		/* Passive OPEN */
2003		cleanup_retrans_entry(cm_node);
2004		if (datasize) {
2005			cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2006			handle_rcv_mpa(cm_node, skb);
2007		} else {
2008			drop_packet(skb);
2009		}
2010		break;
2011	case NES_CM_STATE_MPAREQ_SENT:
2012		cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2013		if (datasize) {
2014			cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2015			handle_rcv_mpa(cm_node, skb);
2016		} else { /* Could be just an ack pkt.. */
2017			dev_kfree_skb_any(skb);
2018		}
2019		break;
2020	case NES_CM_STATE_LISTENING:
2021		cleanup_retrans_entry(cm_node);
2022		cm_node->state = NES_CM_STATE_CLOSED;
2023		send_reset(cm_node, skb);
2024		break;
2025	case NES_CM_STATE_CLOSED:
2026		cleanup_retrans_entry(cm_node);
2027		add_ref_cm_node(cm_node);
2028		send_reset(cm_node, skb);
2029		break;
2030	case NES_CM_STATE_LAST_ACK:
2031	case NES_CM_STATE_CLOSING:
2032		cleanup_retrans_entry(cm_node);
2033		cm_node->state = NES_CM_STATE_CLOSED;
2034		cm_node->cm_id->rem_ref(cm_node->cm_id);
2035		rem_ref_cm_node(cm_node->cm_core, cm_node);
2036		drop_packet(skb);
2037		break;
2038	case NES_CM_STATE_FIN_WAIT1:
2039		cleanup_retrans_entry(cm_node);
2040		drop_packet(skb);
2041		cm_node->state = NES_CM_STATE_FIN_WAIT2;
2042		break;
2043	case NES_CM_STATE_SYN_SENT:
2044	case NES_CM_STATE_FIN_WAIT2:
2045	case NES_CM_STATE_TSA:
2046	case NES_CM_STATE_MPAREQ_RCVD:
2047	case NES_CM_STATE_UNKNOWN:
2048	default:
2049		cleanup_retrans_entry(cm_node);
2050		drop_packet(skb);
2051		break;
2052	}
2053	return ret;
2054}
2055
2056
2057
2058static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
2059			      struct sk_buff *skb, int optionsize, int passive)
2060{
2061	u8 *optionsloc = (u8 *)&tcph[1];
2062
2063	if (optionsize) {
2064		if (process_options(cm_node, optionsloc, optionsize,
2065				    (u32)tcph->syn)) {
2066			nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
2067				  __func__, cm_node);
2068			if (passive)
2069				passive_open_err(cm_node, skb, 1);
2070			else
2071				active_open_err(cm_node, skb, 1);
2072			return 1;
2073		}
2074	}
2075
2076	cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
2077				     cm_node->tcp_cntxt.snd_wscale;
2078
2079	if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
2080		cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
2081	return 0;
2082}
2083
2084/*
2085 * active_open_err() will send reset() if flag set..
2086 * It will also send ABORT event.
2087 */
2088static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2089			    int reset)
2090{
2091	cleanup_retrans_entry(cm_node);
2092	if (reset) {
2093		nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
2094			  "state=%d\n", cm_node, cm_node->state);
2095		add_ref_cm_node(cm_node);
2096		send_reset(cm_node, skb);
2097	} else {
2098		dev_kfree_skb_any(skb);
2099	}
2100
2101	cm_node->state = NES_CM_STATE_CLOSED;
2102	create_event(cm_node, NES_CM_EVENT_ABORTED);
2103}
2104
2105/*
2106 * passive_open_err() will either do a reset() or will free up the skb and
2107 * remove the cm_node.
2108 */
2109static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2110			     int reset)
2111{
2112	cleanup_retrans_entry(cm_node);
2113	cm_node->state = NES_CM_STATE_CLOSED;
2114	if (reset) {
2115		nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
2116			  "cm_node=%p state =%d\n", cm_node, cm_node->state);
2117		send_reset(cm_node, skb);
2118	} else {
2119		dev_kfree_skb_any(skb);
2120		rem_ref_cm_node(cm_node->cm_core, cm_node);
2121	}
2122}
2123
2124/*
2125 * free_retrans_entry() routines assumes that the retrans_list_lock has
2126 * been acquired before calling.
2127 */
2128static void free_retrans_entry(struct nes_cm_node *cm_node)
2129{
2130	struct nes_timer_entry *send_entry;
2131
2132	send_entry = cm_node->send_entry;
2133	if (send_entry) {
2134		cm_node->send_entry = NULL;
2135		dev_kfree_skb_any(send_entry->skb);
2136		kfree(send_entry);
2137		rem_ref_cm_node(cm_node->cm_core, cm_node);
2138	}
2139}
2140
2141static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
2142{
2143	unsigned long flags;
2144
2145	spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
2146	free_retrans_entry(cm_node);
2147	spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
2148}
2149
2150/**
2151 * process_packet
2152 * Returns skb if to be freed, else it will return NULL if already used..
2153 */
2154static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
2155			   struct nes_cm_core *cm_core)
2156{
2157	enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
2158	struct tcphdr *tcph = tcp_hdr(skb);
2159	u32 fin_set = 0;
2160	int ret = 0;
2161
2162	skb_pull(skb, ip_hdr(skb)->ihl << 2);
2163
2164	nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
2165		  "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
2166		  tcph->ack, tcph->rst, tcph->fin);
2167
2168	if (tcph->rst) {
2169		pkt_type = NES_PKT_TYPE_RST;
2170	} else if (tcph->syn) {
2171		pkt_type = NES_PKT_TYPE_SYN;
2172		if (tcph->ack)
2173			pkt_type = NES_PKT_TYPE_SYNACK;
2174	} else if (tcph->ack) {
2175		pkt_type = NES_PKT_TYPE_ACK;
2176	}
2177	if (tcph->fin)
2178		fin_set = 1;
2179
2180	switch (pkt_type) {
2181	case NES_PKT_TYPE_SYN:
2182		handle_syn_pkt(cm_node, skb, tcph);
2183		break;
2184	case NES_PKT_TYPE_SYNACK:
2185		handle_synack_pkt(cm_node, skb, tcph);
2186		break;
2187	case NES_PKT_TYPE_ACK:
2188		ret = handle_ack_pkt(cm_node, skb, tcph);
2189		if (fin_set && !ret)
2190			handle_fin_pkt(cm_node);
2191		break;
2192	case NES_PKT_TYPE_RST:
2193		handle_rst_pkt(cm_node, skb, tcph);
2194		break;
2195	default:
2196		if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
2197			handle_fin_pkt(cm_node);
2198		drop_packet(skb);
2199		break;
2200	}
2201}
2202
2203/**
2204 * mini_cm_listen - create a listen node with params
2205 */
2206static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
2207					      struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
2208{
2209	struct nes_cm_listener *listener;
2210	unsigned long flags;
2211
2212	nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
2213		  cm_info->loc_addr, cm_info->loc_port);
2214
2215	/* cannot have multiple matching listeners */
2216	listener = find_listener(cm_core, htonl(cm_info->loc_addr),
2217				 htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
2218	if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
2219		/* find automatically incs ref count ??? */
2220		atomic_dec(&listener->ref_count);
2221		nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
2222		return NULL;
2223	}
2224
2225	if (!listener) {
2226		/* create a CM listen node (1/2 node to compare incoming traffic to) */
2227		listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
2228		if (!listener) {
2229			nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
2230			return NULL;
2231		}
2232
2233		listener->loc_addr = htonl(cm_info->loc_addr);
2234		listener->loc_port = htons(cm_info->loc_port);
2235		listener->reused_node = 0;
2236
2237		atomic_set(&listener->ref_count, 1);
2238	}
2239	/* pasive case */
2240	/* find already inc'ed the ref count */
2241	else {
2242		listener->reused_node = 1;
2243	}
2244
2245	listener->cm_id = cm_info->cm_id;
2246	atomic_set(&listener->pend_accepts_cnt, 0);
2247	listener->cm_core = cm_core;
2248	listener->nesvnic = nesvnic;
2249	atomic_inc(&cm_core->node_cnt);
2250
2251	listener->conn_type = cm_info->conn_type;
2252	listener->backlog = cm_info->backlog;
2253	listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
2254
2255	if (!listener->reused_node) {
2256		spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2257		list_add(&listener->list, &cm_core->listen_list.list);
2258		spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2259		atomic_inc(&cm_core->listen_node_cnt);
2260	}
2261
2262	nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2263		  " listener = %p, backlog = %d, cm_id = %p.\n",
2264		  cm_info->loc_addr, cm_info->loc_port,
2265		  listener, listener->backlog, listener->cm_id);
2266
2267	return listener;
2268}
2269
2270
2271/**
2272 * mini_cm_connect - make a connection node with params
2273 */
2274static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2275					   struct nes_vnic *nesvnic, u16 private_data_len,
2276					   void *private_data, struct nes_cm_info *cm_info)
2277{
2278	int ret = 0;
2279	struct nes_cm_node *cm_node;
2280	struct nes_cm_listener *loopbackremotelistener;
2281	struct nes_cm_node *loopbackremotenode;
2282	struct nes_cm_info loopback_cm_info;
2283	u8 *start_buff;
2284
2285	/* create a CM connection node */
2286	cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2287	if (!cm_node)
2288		return NULL;
2289
2290	/* set our node side to client (active) side */
2291	cm_node->tcp_cntxt.client = 1;
2292	cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2293
2294	if (cm_info->loc_addr == cm_info->rem_addr) {
2295		loopbackremotelistener = find_listener(cm_core,
2296						       ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
2297						       NES_CM_LISTENER_ACTIVE_STATE);
2298		if (loopbackremotelistener == NULL) {
2299			create_event(cm_node, NES_CM_EVENT_ABORTED);
2300		} else {
2301			loopback_cm_info = *cm_info;
2302			loopback_cm_info.loc_port = cm_info->rem_port;
2303			loopback_cm_info.rem_port = cm_info->loc_port;
2304			loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2305			loopbackremotenode = make_cm_node(cm_core, nesvnic,
2306							  &loopback_cm_info, loopbackremotelistener);
2307			if (!loopbackremotenode) {
2308				rem_ref_cm_node(cm_node->cm_core, cm_node);
2309				return NULL;
2310			}
2311			atomic_inc(&cm_loopbacks);
2312			loopbackremotenode->loopbackpartner = cm_node;
2313			loopbackremotenode->tcp_cntxt.rcv_wscale =
2314				NES_CM_DEFAULT_RCV_WND_SCALE;
2315			cm_node->loopbackpartner = loopbackremotenode;
2316			memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2317			       private_data_len);
2318			loopbackremotenode->mpa_frame_size = private_data_len;
2319
2320			/* we are done handling this state. */
2321			/* set node to a TSA state */
2322			cm_node->state = NES_CM_STATE_TSA;
2323			cm_node->tcp_cntxt.rcv_nxt =
2324				loopbackremotenode->tcp_cntxt.loc_seq_num;
2325			loopbackremotenode->tcp_cntxt.rcv_nxt =
2326				cm_node->tcp_cntxt.loc_seq_num;
2327			cm_node->tcp_cntxt.max_snd_wnd =
2328				loopbackremotenode->tcp_cntxt.rcv_wnd;
2329			loopbackremotenode->tcp_cntxt.max_snd_wnd =
2330				cm_node->tcp_cntxt.rcv_wnd;
2331			cm_node->tcp_cntxt.snd_wnd =
2332				loopbackremotenode->tcp_cntxt.rcv_wnd;
2333			loopbackremotenode->tcp_cntxt.snd_wnd =
2334				cm_node->tcp_cntxt.rcv_wnd;
2335			cm_node->tcp_cntxt.snd_wscale =
2336				loopbackremotenode->tcp_cntxt.rcv_wscale;
2337			loopbackremotenode->tcp_cntxt.snd_wscale =
2338				cm_node->tcp_cntxt.rcv_wscale;
2339			loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2340			create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2341		}
2342		return cm_node;
2343	}
2344
2345	start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
2346	cm_node->mpa_frame_size = private_data_len;
2347
2348	memcpy(start_buff, private_data, private_data_len);
2349
2350	/* send a syn and goto syn sent state */
2351	cm_node->state = NES_CM_STATE_SYN_SENT;
2352	ret = send_syn(cm_node, 0, NULL);
2353
2354	if (ret) {
2355		/* error in sending the syn free up the cm_node struct */
2356		nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2357			  "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2358			  cm_node->rem_addr, cm_node->rem_port, cm_node,
2359			  cm_node->cm_id);
2360		rem_ref_cm_node(cm_node->cm_core, cm_node);
2361		cm_node = NULL;
2362	}
2363
2364	if (cm_node) {
2365		nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2366			  "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2367			  cm_node->rem_addr, cm_node->rem_port, cm_node,
2368			  cm_node->cm_id);
2369	}
2370
2371	return cm_node;
2372}
2373
2374
2375/**
2376 * mini_cm_accept - accept a connection
2377 * This function is never called
2378 */
2379static int mini_cm_accept(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2380{
2381	return 0;
2382}
2383
2384
2385/**
2386 * mini_cm_reject - reject and teardown a connection
2387 */
2388static int mini_cm_reject(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2389{
2390	int ret = 0;
2391	int err = 0;
2392	int passive_state;
2393	struct nes_cm_event event;
2394	struct iw_cm_id *cm_id = cm_node->cm_id;
2395	struct nes_cm_node *loopback = cm_node->loopbackpartner;
2396
2397	nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2398		  __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2399
2400	if (cm_node->tcp_cntxt.client)
2401		return ret;
2402	cleanup_retrans_entry(cm_node);
2403
2404	if (!loopback) {
2405		passive_state = atomic_add_return(1, &cm_node->passive_state);
2406		if (passive_state == NES_SEND_RESET_EVENT) {
2407			cm_node->state = NES_CM_STATE_CLOSED;
2408			rem_ref_cm_node(cm_core, cm_node);
2409		} else {
2410			if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2411				rem_ref_cm_node(cm_core, cm_node);
2412			} else {
2413				ret = send_mpa_reject(cm_node);
2414				if (ret) {
2415					cm_node->state = NES_CM_STATE_CLOSED;
2416					err = send_reset(cm_node, NULL);
2417					if (err)
2418						WARN_ON(1);
2419				} else {
2420					cm_id->add_ref(cm_id);
2421				}
2422			}
2423		}
2424	} else {
2425		cm_node->cm_id = NULL;
2426		if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2427			rem_ref_cm_node(cm_core, cm_node);
2428			rem_ref_cm_node(cm_core, loopback);
2429		} else {
2430			event.cm_node = loopback;
2431			event.cm_info.rem_addr = loopback->rem_addr;
2432			event.cm_info.loc_addr = loopback->loc_addr;
2433			event.cm_info.rem_port = loopback->rem_port;
2434			event.cm_info.loc_port = loopback->loc_port;
2435			event.cm_info.cm_id = loopback->cm_id;
2436			cm_event_mpa_reject(&event);
2437			rem_ref_cm_node(cm_core, cm_node);
2438			loopback->state = NES_CM_STATE_CLOSING;
2439
2440			cm_id = loopback->cm_id;
2441			rem_ref_cm_node(cm_core, loopback);
2442			cm_id->rem_ref(cm_id);
2443		}
2444	}
2445
2446	return ret;
2447}
2448
2449
2450/**
2451 * mini_cm_close
2452 */
2453static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2454{
2455	int ret = 0;
2456
2457	if (!cm_core || !cm_node)
2458		return -EINVAL;
2459
2460	switch (cm_node->state) {
2461	case NES_CM_STATE_SYN_RCVD:
2462	case NES_CM_STATE_SYN_SENT:
2463	case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2464	case NES_CM_STATE_ESTABLISHED:
2465	case NES_CM_STATE_ACCEPTING:
2466	case NES_CM_STATE_MPAREQ_SENT:
2467	case NES_CM_STATE_MPAREQ_RCVD:
2468		cleanup_retrans_entry(cm_node);
2469		send_reset(cm_node, NULL);
2470		break;
2471	case NES_CM_STATE_CLOSE_WAIT:
2472		cm_node->state = NES_CM_STATE_LAST_ACK;
2473		send_fin(cm_node, NULL);
2474		break;
2475	case NES_CM_STATE_FIN_WAIT1:
2476	case NES_CM_STATE_FIN_WAIT2:
2477	case NES_CM_STATE_LAST_ACK:
2478	case NES_CM_STATE_TIME_WAIT:
2479	case NES_CM_STATE_CLOSING:
2480		ret = -1;
2481		break;
2482	case NES_CM_STATE_LISTENING:
2483		cleanup_retrans_entry(cm_node);
2484		send_reset(cm_node, NULL);
2485		break;
2486	case NES_CM_STATE_MPAREJ_RCVD:
2487	case NES_CM_STATE_UNKNOWN:
2488	case NES_CM_STATE_INITED:
2489	case NES_CM_STATE_CLOSED:
2490	case NES_CM_STATE_LISTENER_DESTROYED:
2491		ret = rem_ref_cm_node(cm_core, cm_node);
2492		break;
2493	case NES_CM_STATE_TSA:
2494		if (cm_node->send_entry)
2495			printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2496			       "send_entry=%p\n", cm_node->send_entry);
2497		ret = rem_ref_cm_node(cm_core, cm_node);
2498		break;
2499	}
2500	return ret;
2501}
2502
2503
2504/**
2505 * recv_pkt - recv an ETHERNET packet, and process it through CM
2506 * node state machine
2507 */
2508static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2509			    struct nes_vnic *nesvnic, struct sk_buff *skb)
2510{
2511	struct nes_cm_node *cm_node = NULL;
2512	struct nes_cm_listener *listener = NULL;
2513	struct iphdr *iph;
2514	struct tcphdr *tcph;
2515	struct nes_cm_info nfo;
2516	int skb_handled = 1;
2517	__be32 tmp_daddr, tmp_saddr;
2518
2519	if (!skb)
2520		return 0;
2521	if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr))
2522		return 0;
2523
2524	iph = (struct iphdr *)skb->data;
2525	tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2526
2527	nfo.loc_addr = ntohl(iph->daddr);
2528	nfo.loc_port = ntohs(tcph->dest);
2529	nfo.rem_addr = ntohl(iph->saddr);
2530	nfo.rem_port = ntohs(tcph->source);
2531
2532	tmp_daddr = cpu_to_be32(iph->daddr);
2533	tmp_saddr = cpu_to_be32(iph->saddr);
2534
2535	nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2536		  &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2537
2538	do {
2539		cm_node = find_node(cm_core,
2540				    nfo.rem_port, nfo.rem_addr,
2541				    nfo.loc_port, nfo.loc_addr);
2542
2543		if (!cm_node) {
2544			/* Only type of packet accepted are for */
2545			/* the PASSIVE open (syn only) */
2546			if ((!tcph->syn) || (tcph->ack)) {
2547				skb_handled = 0;
2548				break;
2549			}
2550			listener = find_listener(cm_core, nfo.loc_addr,
2551						 nfo.loc_port,
2552						 NES_CM_LISTENER_ACTIVE_STATE);
2553			if (!listener) {
2554				nfo.cm_id = NULL;
2555				nfo.conn_type = 0;
2556				nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2557				skb_handled = 0;
2558				break;
2559			}
2560			nfo.cm_id = listener->cm_id;
2561			nfo.conn_type = listener->conn_type;
2562			cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2563					       listener);
2564			if (!cm_node) {
2565				nes_debug(NES_DBG_CM, "Unable to allocate "
2566					  "node\n");
2567				cm_packets_dropped++;
2568				atomic_dec(&listener->ref_count);
2569				dev_kfree_skb_any(skb);
2570				break;
2571			}
2572			if (!tcph->rst && !tcph->fin) {
2573				cm_node->state = NES_CM_STATE_LISTENING;
2574			} else {
2575				cm_packets_dropped++;
2576				rem_ref_cm_node(cm_core, cm_node);
2577				dev_kfree_skb_any(skb);
2578				break;
2579			}
2580			add_ref_cm_node(cm_node);
2581		} else if (cm_node->state == NES_CM_STATE_TSA) {
2582			if (cm_node->nesqp->pau_mode)
2583				nes_queue_mgt_skbs(skb, nesvnic, cm_node->nesqp);
2584			else {
2585				rem_ref_cm_node(cm_core, cm_node);
2586				atomic_inc(&cm_accel_dropped_pkts);
2587				dev_kfree_skb_any(skb);
2588			}
2589			break;
2590		}
2591		skb_reset_network_header(skb);
2592		skb_set_transport_header(skb, sizeof(*tcph));
2593		skb->len = ntohs(iph->tot_len);
2594		process_packet(cm_node, skb, cm_core);
2595		rem_ref_cm_node(cm_core, cm_node);
2596	} while (0);
2597	return skb_handled;
2598}
2599
2600
2601/**
2602 * nes_cm_alloc_core - allocate a top level instance of a cm core
2603 */
2604static struct nes_cm_core *nes_cm_alloc_core(void)
2605{
2606	struct nes_cm_core *cm_core;
2607
2608	/* setup the CM core */
2609	/* alloc top level core control structure */
2610	cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2611	if (!cm_core)
2612		return NULL;
2613
2614	INIT_LIST_HEAD(&cm_core->connected_nodes);
2615	init_timer(&cm_core->tcp_timer);
2616	cm_core->tcp_timer.function = nes_cm_timer_tick;
2617
2618	cm_core->mtu = NES_CM_DEFAULT_MTU;
2619	cm_core->state = NES_CM_STATE_INITED;
2620	cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2621
2622	atomic_set(&cm_core->events_posted, 0);
2623
2624	cm_core->api = &nes_cm_api;
2625
2626	spin_lock_init(&cm_core->ht_lock);
2627	spin_lock_init(&cm_core->listen_list_lock);
2628
2629	INIT_LIST_HEAD(&cm_core->listen_list.list);
2630
2631	nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2632
2633	nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2634	cm_core->event_wq = create_singlethread_workqueue("nesewq");
2635	cm_core->post_event = nes_cm_post_event;
2636	nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2637	cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2638
2639	print_core(cm_core);
2640	return cm_core;
2641}
2642
2643
2644/**
2645 * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2646 */
2647static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2648{
2649	nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2650
2651	if (!cm_core)
2652		return -EINVAL;
2653
2654	barrier();
2655
2656	if (timer_pending(&cm_core->tcp_timer))
2657		del_timer(&cm_core->tcp_timer);
2658
2659	destroy_workqueue(cm_core->event_wq);
2660	destroy_workqueue(cm_core->disconn_wq);
2661	nes_debug(NES_DBG_CM, "\n");
2662	kfree(cm_core);
2663
2664	return 0;
2665}
2666
2667
2668/**
2669 * mini_cm_get
2670 */
2671static int mini_cm_get(struct nes_cm_core *cm_core)
2672{
2673	return cm_core->state;
2674}
2675
2676
2677/**
2678 * mini_cm_set
2679 */
2680static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2681{
2682	int ret = 0;
2683
2684	switch (type) {
2685	case NES_CM_SET_PKT_SIZE:
2686		cm_core->mtu = value;
2687		break;
2688	case NES_CM_SET_FREE_PKT_Q_SIZE:
2689		cm_core->free_tx_pkt_max = value;
2690		break;
2691	default:
2692		/* unknown set option */
2693		ret = -EINVAL;
2694	}
2695
2696	return ret;
2697}
2698
2699
2700/**
2701 * nes_cm_init_tsa_conn setup HW; MPA frames must be
2702 * successfully exchanged when this is called
2703 */
2704static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2705{
2706	int ret = 0;
2707
2708	if (!nesqp)
2709		return -EINVAL;
2710
2711	nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2712						  NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2713						  NES_QPCONTEXT_MISC_DROS);
2714
2715	if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2716		nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2717
2718	nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2719
2720	nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2721
2722	nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2723		(u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2724
2725	nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2726		(cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2727		NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2728
2729	nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2730		(cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2731		NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2732
2733	nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2734	nesqp->nesqp_context->ts_recent = 0;
2735	nesqp->nesqp_context->ts_age = 0;
2736	nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2737	nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2738	nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2739	nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2740						    cm_node->tcp_cntxt.rcv_wscale);
2741	nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2742	nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2743	nesqp->nesqp_context->srtt = 0;
2744	nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2745	nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2746	nesqp->nesqp_context->cwnd = cpu_to_le32(2 * cm_node->tcp_cntxt.mss);
2747	nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2748	nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2749	nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2750
2751	nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2752		  " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2753		  nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2754		  le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2755		  cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2756		  le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2757		  le32_to_cpu(nesqp->nesqp_context->misc));
2758	nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2759	nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2760	nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2761
2762	nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2763	cm_node->state = NES_CM_STATE_TSA;
2764
2765	return ret;
2766}
2767
2768
2769/**
2770 * nes_cm_disconn
2771 */
2772int nes_cm_disconn(struct nes_qp *nesqp)
2773{
2774	struct disconn_work *work;
2775
2776	work = kzalloc(sizeof *work, GFP_ATOMIC);
2777	if (!work)
2778		return -ENOMEM;  /* Timer will clean up */
2779
2780	nes_add_ref(&nesqp->ibqp);
2781	work->nesqp = nesqp;
2782	INIT_WORK(&work->work, nes_disconnect_worker);
2783	queue_work(g_cm_core->disconn_wq, &work->work);
2784	return 0;
2785}
2786
2787
2788/**
2789 * nes_disconnect_worker
2790 */
2791static void nes_disconnect_worker(struct work_struct *work)
2792{
2793	struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2794	struct nes_qp *nesqp = dwork->nesqp;
2795
2796	kfree(dwork);
2797	nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2798		  nesqp->last_aeq, nesqp->hwqp.qp_id);
2799	nes_cm_disconn_true(nesqp);
2800	nes_rem_ref(&nesqp->ibqp);
2801}
2802
2803
2804/**
2805 * nes_cm_disconn_true
2806 */
2807static int nes_cm_disconn_true(struct nes_qp *nesqp)
2808{
2809	unsigned long flags;
2810	int ret = 0;
2811	struct iw_cm_id *cm_id;
2812	struct iw_cm_event cm_event;
2813	struct nes_vnic *nesvnic;
2814	u16 last_ae;
2815	u8 original_hw_tcp_state;
2816	u8 original_ibqp_state;
2817	int disconn_status = 0;
2818	int issue_disconn = 0;
2819	int issue_close = 0;
2820	int issue_flush = 0;
2821	u32 flush_q = NES_CQP_FLUSH_RQ;
2822	struct ib_event ibevent;
2823
2824	if (!nesqp) {
2825		nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2826		return -1;
2827	}
2828
2829	spin_lock_irqsave(&nesqp->lock, flags);
2830	cm_id = nesqp->cm_id;
2831	/* make sure we havent already closed this connection */
2832	if (!cm_id) {
2833		nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2834			  nesqp->hwqp.qp_id);
2835		spin_unlock_irqrestore(&nesqp->lock, flags);
2836		return -1;
2837	}
2838
2839	nesvnic = to_nesvnic(nesqp->ibqp.device);
2840	nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2841
2842	original_hw_tcp_state = nesqp->hw_tcp_state;
2843	original_ibqp_state = nesqp->ibqp_state;
2844	last_ae = nesqp->last_aeq;
2845
2846	if (nesqp->term_flags) {
2847		issue_disconn = 1;
2848		issue_close = 1;
2849		nesqp->cm_id = NULL;
2850		del_timer(&nesqp->terminate_timer);
2851		if (nesqp->flush_issued == 0) {
2852			nesqp->flush_issued = 1;
2853			issue_flush = 1;
2854		}
2855	} else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2856			((original_ibqp_state == IB_QPS_RTS) &&
2857			(last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2858		issue_disconn = 1;
2859		if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2860			disconn_status = -ECONNRESET;
2861	}
2862
2863	if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2864		 (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2865		 (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2866		 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2867		issue_close = 1;
2868		nesqp->cm_id = NULL;
2869		if (nesqp->flush_issued == 0) {
2870			nesqp->flush_issued = 1;
2871			issue_flush = 1;
2872		}
2873	}
2874
2875	spin_unlock_irqrestore(&nesqp->lock, flags);
2876
2877	if ((issue_flush) && (nesqp->destroyed == 0)) {
2878		/* Flush the queue(s) */
2879		if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2880			flush_q |= NES_CQP_FLUSH_SQ;
2881		flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2882
2883		if (nesqp->term_flags) {
2884			ibevent.device = nesqp->ibqp.device;
2885			ibevent.event = nesqp->terminate_eventtype;
2886			ibevent.element.qp = &nesqp->ibqp;
2887			if (nesqp->ibqp.event_handler)
2888				nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2889		}
2890	}
2891
2892	if ((cm_id) && (cm_id->event_handler)) {
2893		if (issue_disconn) {
2894			atomic_inc(&cm_disconnects);
2895			cm_event.event = IW_CM_EVENT_DISCONNECT;
2896			cm_event.status = disconn_status;
2897			cm_event.local_addr = cm_id->local_addr;
2898			cm_event.remote_addr = cm_id->remote_addr;
2899			cm_event.private_data = NULL;
2900			cm_event.private_data_len = 0;
2901
2902			nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2903				  " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2904				  "cm_id = %p, refcount = %u.\n",
2905				  nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2906				  nesqp->hwqp.sq_tail, cm_id,
2907				  atomic_read(&nesqp->refcount));
2908
2909			ret = cm_id->event_handler(cm_id, &cm_event);
2910			if (ret)
2911				nes_debug(NES_DBG_CM, "OFA CM event_handler "
2912					  "returned, ret=%d\n", ret);
2913		}
2914
2915		if (issue_close) {
2916			atomic_inc(&cm_closes);
2917			nes_disconnect(nesqp, 1);
2918
2919			cm_id->provider_data = nesqp;
2920			/* Send up the close complete event */
2921			cm_event.event = IW_CM_EVENT_CLOSE;
2922			cm_event.status = 0;
2923			cm_event.provider_data = cm_id->provider_data;
2924			cm_event.local_addr = cm_id->local_addr;
2925			cm_event.remote_addr = cm_id->remote_addr;
2926			cm_event.private_data = NULL;
2927			cm_event.private_data_len = 0;
2928
2929			ret = cm_id->event_handler(cm_id, &cm_event);
2930			if (ret)
2931				nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2932
2933			cm_id->rem_ref(cm_id);
2934		}
2935	}
2936
2937	return 0;
2938}
2939
2940
2941/**
2942 * nes_disconnect
2943 */
2944static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2945{
2946	int ret = 0;
2947	struct nes_vnic *nesvnic;
2948	struct nes_device *nesdev;
2949	struct nes_ib_device *nesibdev;
2950
2951	nesvnic = to_nesvnic(nesqp->ibqp.device);
2952	if (!nesvnic)
2953		return -EINVAL;
2954
2955	nesdev = nesvnic->nesdev;
2956	nesibdev = nesvnic->nesibdev;
2957
2958	nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2959			netdev_refcnt_read(nesvnic->netdev));
2960
2961	if (nesqp->active_conn) {
2962
2963		/* indicate this connection is NOT active */
2964		nesqp->active_conn = 0;
2965	} else {
2966		/* Need to free the Last Streaming Mode Message */
2967		if (nesqp->ietf_frame) {
2968			if (nesqp->lsmm_mr)
2969				nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2970			pci_free_consistent(nesdev->pcidev,
2971					    nesqp->private_data_len + nesqp->ietf_frame_size,
2972					    nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2973		}
2974	}
2975
2976	/* close the CM node down if it is still active */
2977	if (nesqp->cm_node) {
2978		nes_debug(NES_DBG_CM, "Call close API\n");
2979
2980		g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2981	}
2982
2983	return ret;
2984}
2985
2986
2987/**
2988 * nes_accept
2989 */
2990int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2991{
2992	u64 u64temp;
2993	struct ib_qp *ibqp;
2994	struct nes_qp *nesqp;
2995	struct nes_vnic *nesvnic;
2996	struct nes_device *nesdev;
2997	struct nes_cm_node *cm_node;
2998	struct nes_adapter *adapter;
2999	struct ib_qp_attr attr;
3000	struct iw_cm_event cm_event;
3001	struct nes_hw_qp_wqe *wqe;
3002	struct nes_v4_quad nes_quad;
3003	u32 crc_value;
3004	int ret;
3005	int passive_state;
3006	struct nes_ib_device *nesibdev;
3007	struct ib_mr *ibmr = NULL;
3008	struct ib_phys_buf ibphysbuf;
3009	struct nes_pd *nespd;
3010	u64 tagged_offset;
3011	u8 mpa_frame_offset = 0;
3012	struct ietf_mpa_v2 *mpa_v2_frame;
3013	u8 start_addr = 0;
3014	u8 *start_ptr = &start_addr;
3015	u8 **start_buff = &start_ptr;
3016	u16 buff_len = 0;
3017
3018	ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3019	if (!ibqp)
3020		return -EINVAL;
3021
3022	/* get all our handles */
3023	nesqp = to_nesqp(ibqp);
3024	nesvnic = to_nesvnic(nesqp->ibqp.device);
3025	nesdev = nesvnic->nesdev;
3026	adapter = nesdev->nesadapter;
3027
3028	cm_node = (struct nes_cm_node *)cm_id->provider_data;
3029	nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
3030		"%s\n", cm_node, nesvnic, nesvnic->netdev,
3031		nesvnic->netdev->name);
3032
3033	if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
3034		if (cm_node->loopbackpartner)
3035			rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
3036		rem_ref_cm_node(cm_node->cm_core, cm_node);
3037		return -EINVAL;
3038	}
3039
3040	passive_state = atomic_add_return(1, &cm_node->passive_state);
3041	if (passive_state == NES_SEND_RESET_EVENT) {
3042		rem_ref_cm_node(cm_node->cm_core, cm_node);
3043		return -ECONNRESET;
3044	}
3045
3046	/* associate the node with the QP */
3047	nesqp->cm_node = (void *)cm_node;
3048	cm_node->nesqp = nesqp;
3049
3050	nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
3051		nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
3052	atomic_inc(&cm_accepts);
3053
3054	nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3055			netdev_refcnt_read(nesvnic->netdev));
3056
3057	nesqp->ietf_frame_size = sizeof(struct ietf_mpa_v2);
3058	/* allocate the ietf frame and space for private data */
3059	nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
3060						 nesqp->ietf_frame_size + conn_param->private_data_len,
3061						 &nesqp->ietf_frame_pbase);
3062
3063	if (!nesqp->ietf_frame) {
3064		nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
3065		return -ENOMEM;
3066	}
3067	mpa_v2_frame = (struct ietf_mpa_v2 *)nesqp->ietf_frame;
3068
3069	if (cm_node->mpa_frame_rev == IETF_MPA_V1)
3070		mpa_frame_offset = 4;
3071
3072	memcpy(mpa_v2_frame->priv_data, conn_param->private_data,
3073	       conn_param->private_data_len);
3074
3075	cm_build_mpa_frame(cm_node, start_buff, &buff_len, nesqp->ietf_frame, MPA_KEY_REPLY);
3076	nesqp->private_data_len = conn_param->private_data_len;
3077
3078	/* setup our first outgoing iWarp send WQE (the IETF frame response) */
3079	wqe = &nesqp->hwqp.sq_vbase[0];
3080
3081	if (cm_id->remote_addr.sin_addr.s_addr !=
3082	    cm_id->local_addr.sin_addr.s_addr) {
3083		u64temp = (unsigned long)nesqp;
3084		nesibdev = nesvnic->nesibdev;
3085		nespd = nesqp->nespd;
3086		ibphysbuf.addr = nesqp->ietf_frame_pbase + mpa_frame_offset;
3087		ibphysbuf.size = buff_len;
3088		tagged_offset = (u64)(unsigned long)*start_buff;
3089		ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
3090						   &ibphysbuf, 1,
3091						   IB_ACCESS_LOCAL_WRITE,
3092						   &tagged_offset);
3093		if (!ibmr) {
3094			nes_debug(NES_DBG_CM, "Unable to register memory region"
3095				  "for lSMM for cm_node = %p \n",
3096				  cm_node);
3097			pci_free_consistent(nesdev->pcidev,
3098					    nesqp->private_data_len + nesqp->ietf_frame_size,
3099					    nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3100			return -ENOMEM;
3101		}
3102
3103		ibmr->pd = &nespd->ibpd;
3104		ibmr->device = nespd->ibpd.device;
3105		nesqp->lsmm_mr = ibmr;
3106
3107		u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
3108		set_wqe_64bit_value(wqe->wqe_words,
3109				    NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
3110				    u64temp);
3111		wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3112			cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
3113				    NES_IWARP_SQ_WQE_WRPDU);
3114		wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
3115			cpu_to_le32(buff_len);
3116		set_wqe_64bit_value(wqe->wqe_words,
3117				    NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
3118				    (u64)(unsigned long)(*start_buff));
3119		wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
3120			cpu_to_le32(buff_len);
3121		wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
3122		if (nesqp->sq_kmapped) {
3123			nesqp->sq_kmapped = 0;
3124			kunmap(nesqp->page);
3125		}
3126
3127		nesqp->nesqp_context->ird_ord_sizes |=
3128			cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3129				    NES_QPCONTEXT_ORDIRD_WRPDU);
3130	} else {
3131		nesqp->nesqp_context->ird_ord_sizes |=
3132			cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
3133	}
3134	nesqp->skip_lsmm = 1;
3135
3136
3137	/* Cache the cm_id in the qp */
3138	nesqp->cm_id = cm_id;
3139	cm_node->cm_id = cm_id;
3140
3141	/*  nesqp->cm_node = (void *)cm_id->provider_data; */
3142	cm_id->provider_data = nesqp;
3143	nesqp->active_conn = 0;
3144
3145	if (cm_node->state == NES_CM_STATE_TSA)
3146		nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
3147			  cm_node);
3148
3149	nes_cm_init_tsa_conn(nesqp, cm_node);
3150
3151	nesqp->nesqp_context->tcpPorts[0] =
3152		cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3153	nesqp->nesqp_context->tcpPorts[1] =
3154		cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3155
3156	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3157		nesqp->nesqp_context->ip0 =
3158			cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3159	else
3160		nesqp->nesqp_context->ip0 =
3161			cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3162
3163	nesqp->nesqp_context->misc2 |= cpu_to_le32(
3164		(u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3165		NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3166
3167	nesqp->nesqp_context->arp_index_vlan |=
3168		cpu_to_le32(nes_arp_table(nesdev,
3169					  le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
3170					  NES_ARP_RESOLVE) << 16);
3171
3172	nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3173		jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3174
3175	nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3176
3177	nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
3178		((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
3179	nesqp->nesqp_context->ird_ord_sizes |=
3180		cpu_to_le32((u32)conn_param->ord);
3181
3182	memset(&nes_quad, 0, sizeof(nes_quad));
3183	nes_quad.DstIpAdrIndex =
3184		cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3185	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3186		nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3187	else
3188		nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3189	nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3190	nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3191
3192	/* Produce hash key */
3193	crc_value = get_crc_value(&nes_quad);
3194	nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3195	nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
3196		  nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
3197
3198	nesqp->hte_index &= adapter->hte_index_mask;
3199	nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3200
3201	cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3202
3203	nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
3204		  "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
3205		  "private data length=%u.\n", nesqp->hwqp.qp_id,
3206		  ntohl(cm_id->remote_addr.sin_addr.s_addr),
3207		  ntohs(cm_id->remote_addr.sin_port),
3208		  ntohl(cm_id->local_addr.sin_addr.s_addr),
3209		  ntohs(cm_id->local_addr.sin_port),
3210		  le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
3211		  le32_to_cpu(nesqp->nesqp_context->snd_nxt),
3212		  buff_len);
3213
3214	/* notify OF layer that accept event was successful */
3215	cm_id->add_ref(cm_id);
3216	nes_add_ref(&nesqp->ibqp);
3217
3218	cm_event.event = IW_CM_EVENT_ESTABLISHED;
3219	cm_event.status = 0;
3220	cm_event.provider_data = (void *)nesqp;
3221	cm_event.local_addr = cm_id->local_addr;
3222	cm_event.remote_addr = cm_id->remote_addr;
3223	cm_event.private_data = NULL;
3224	cm_event.private_data_len = 0;
3225	ret = cm_id->event_handler(cm_id, &cm_event);
3226	attr.qp_state = IB_QPS_RTS;
3227	nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3228	if (cm_node->loopbackpartner) {
3229		cm_node->loopbackpartner->mpa_frame_size =
3230			nesqp->private_data_len;
3231		/* copy entire MPA frame to our cm_node's frame */
3232		memcpy(cm_node->loopbackpartner->mpa_frame_buf,
3233		       conn_param->private_data, conn_param->private_data_len);
3234		create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
3235	}
3236	if (ret)
3237		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3238		       "ret=%d\n", __func__, __LINE__, ret);
3239
3240	return 0;
3241}
3242
3243
3244/**
3245 * nes_reject
3246 */
3247int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3248{
3249	struct nes_cm_node *cm_node;
3250	struct nes_cm_node *loopback;
3251	struct nes_cm_core *cm_core;
3252	u8 *start_buff;
3253
3254	atomic_inc(&cm_rejects);
3255	cm_node = (struct nes_cm_node *)cm_id->provider_data;
3256	loopback = cm_node->loopbackpartner;
3257	cm_core = cm_node->cm_core;
3258	cm_node->cm_id = cm_id;
3259
3260	if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
3261		return -EINVAL;
3262
3263	if (loopback) {
3264		memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3265		loopback->mpa_frame.priv_data_len = pdata_len;
3266		loopback->mpa_frame_size = pdata_len;
3267	} else {
3268		start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
3269		cm_node->mpa_frame_size = pdata_len;
3270		memcpy(start_buff, pdata, pdata_len);
3271	}
3272	return cm_core->api->reject(cm_core, cm_node);
3273}
3274
3275
3276/**
3277 * nes_connect
3278 * setup and launch cm connect node
3279 */
3280int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3281{
3282	struct ib_qp *ibqp;
3283	struct nes_qp *nesqp;
3284	struct nes_vnic *nesvnic;
3285	struct nes_device *nesdev;
3286	struct nes_cm_node *cm_node;
3287	struct nes_cm_info cm_info;
3288	int apbvt_set = 0;
3289
3290	ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3291	if (!ibqp)
3292		return -EINVAL;
3293	nesqp = to_nesqp(ibqp);
3294	if (!nesqp)
3295		return -EINVAL;
3296	nesvnic = to_nesvnic(nesqp->ibqp.device);
3297	if (!nesvnic)
3298		return -EINVAL;
3299	nesdev = nesvnic->nesdev;
3300	if (!nesdev)
3301		return -EINVAL;
3302
3303	if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
3304		return -EINVAL;
3305
3306	nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3307		  "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3308		  ntohl(nesvnic->local_ipaddr),
3309		  ntohl(cm_id->remote_addr.sin_addr.s_addr),
3310		  ntohs(cm_id->remote_addr.sin_port),
3311		  ntohl(cm_id->local_addr.sin_addr.s_addr),
3312		  ntohs(cm_id->local_addr.sin_port));
3313
3314	atomic_inc(&cm_connects);
3315	nesqp->active_conn = 1;
3316
3317	/* cache the cm_id in the qp */
3318	nesqp->cm_id = cm_id;
3319
3320	cm_id->provider_data = nesqp;
3321
3322	nesqp->private_data_len = conn_param->private_data_len;
3323	nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
3324	/* space for rdma0 read msg */
3325	if (conn_param->ord == 0)
3326		nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(1);
3327
3328	nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3329	nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3330		  conn_param->private_data_len);
3331
3332	if (cm_id->local_addr.sin_addr.s_addr !=
3333	    cm_id->remote_addr.sin_addr.s_addr) {
3334		nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3335				 PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3336		apbvt_set = 1;
3337	}
3338
3339	/* set up the connection params for the node */
3340	cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3341	cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3342	cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3343	cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3344	cm_info.cm_id = cm_id;
3345	cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3346
3347	cm_id->add_ref(cm_id);
3348
3349	/* create a connect CM node connection */
3350	cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3351					  conn_param->private_data_len, (void *)conn_param->private_data,
3352					  &cm_info);
3353	if (!cm_node) {
3354		if (apbvt_set)
3355			nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3356					 PCI_FUNC(nesdev->pcidev->devfn),
3357					 NES_MANAGE_APBVT_DEL);
3358
3359		cm_id->rem_ref(cm_id);
3360		return -ENOMEM;
3361	}
3362
3363	cm_node->apbvt_set = apbvt_set;
3364	nesqp->cm_node = cm_node;
3365	cm_node->nesqp = nesqp;
3366	nes_add_ref(&nesqp->ibqp);
3367
3368	return 0;
3369}
3370
3371
3372/**
3373 * nes_create_listen
3374 */
3375int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3376{
3377	struct nes_vnic *nesvnic;
3378	struct nes_cm_listener *cm_node;
3379	struct nes_cm_info cm_info;
3380	int err;
3381
3382	nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3383			cm_id, ntohs(cm_id->local_addr.sin_port));
3384
3385	nesvnic = to_nesvnic(cm_id->device);
3386	if (!nesvnic)
3387		return -EINVAL;
3388
3389	nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3390			nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3391
3392	nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3393			nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3394
3395	/* setup listen params in our api call struct */
3396	cm_info.loc_addr = nesvnic->local_ipaddr;
3397	cm_info.loc_port = cm_id->local_addr.sin_port;
3398	cm_info.backlog = backlog;
3399	cm_info.cm_id = cm_id;
3400
3401	cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3402
3403
3404	cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3405	if (!cm_node) {
3406		printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3407		       __func__, __LINE__);
3408		return -ENOMEM;
3409	}
3410
3411	cm_id->provider_data = cm_node;
3412
3413	if (!cm_node->reused_node) {
3414		err = nes_manage_apbvt(nesvnic,
3415				       ntohs(cm_id->local_addr.sin_port),
3416				       PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3417				       NES_MANAGE_APBVT_ADD);
3418		if (err) {
3419			printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3420			       err);
3421			g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3422			return err;
3423		}
3424		atomic_inc(&cm_listens_created);
3425	}
3426
3427	cm_id->add_ref(cm_id);
3428	cm_id->provider_data = (void *)cm_node;
3429
3430
3431	return 0;
3432}
3433
3434
3435/**
3436 * nes_destroy_listen
3437 */
3438int nes_destroy_listen(struct iw_cm_id *cm_id)
3439{
3440	if (cm_id->provider_data)
3441		g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3442	else
3443		nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3444
3445	cm_id->rem_ref(cm_id);
3446
3447	return 0;
3448}
3449
3450
3451/**
3452 * nes_cm_recv
3453 */
3454int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3455{
3456	int rc = 0;
3457
3458	cm_packets_received++;
3459	if ((g_cm_core) && (g_cm_core->api))
3460		rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3461	else
3462		nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3463			  " cm is not setup properly.\n");
3464
3465	return rc;
3466}
3467
3468
3469/**
3470 * nes_cm_start
3471 * Start and init a cm core module
3472 */
3473int nes_cm_start(void)
3474{
3475	nes_debug(NES_DBG_CM, "\n");
3476	/* create the primary CM core, pass this handle to subsequent core inits */
3477	g_cm_core = nes_cm_alloc_core();
3478	if (g_cm_core)
3479		return 0;
3480	else
3481		return -ENOMEM;
3482}
3483
3484
3485/**
3486 * nes_cm_stop
3487 * stop and dealloc all cm core instances
3488 */
3489int nes_cm_stop(void)
3490{
3491	g_cm_core->api->destroy_cm_core(g_cm_core);
3492	return 0;
3493}
3494
3495
3496/**
3497 * cm_event_connected
3498 * handle a connected event, setup QPs and HW
3499 */
3500static void cm_event_connected(struct nes_cm_event *event)
3501{
3502	struct nes_qp *nesqp;
3503	struct nes_vnic *nesvnic;
3504	struct nes_device *nesdev;
3505	struct nes_cm_node *cm_node;
3506	struct nes_adapter *nesadapter;
3507	struct ib_qp_attr attr;
3508	struct iw_cm_id *cm_id;
3509	struct iw_cm_event cm_event;
3510	struct nes_v4_quad nes_quad;
3511	u32 crc_value;
3512	int ret;
3513
3514	/* get all our handles */
3515	cm_node = event->cm_node;
3516	cm_id = cm_node->cm_id;
3517	nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3518	nesqp = (struct nes_qp *)cm_id->provider_data;
3519	nesvnic = to_nesvnic(nesqp->ibqp.device);
3520	nesdev = nesvnic->nesdev;
3521	nesadapter = nesdev->nesadapter;
3522
3523	if (nesqp->destroyed)
3524		return;
3525	atomic_inc(&cm_connecteds);
3526	nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3527		  " local port 0x%04X. jiffies = %lu.\n",
3528		  nesqp->hwqp.qp_id,
3529		  ntohl(cm_id->remote_addr.sin_addr.s_addr),
3530		  ntohs(cm_id->remote_addr.sin_port),
3531		  ntohs(cm_id->local_addr.sin_port),
3532		  jiffies);
3533
3534	nes_cm_init_tsa_conn(nesqp, cm_node);
3535
3536	/* set the QP tsa context */
3537	nesqp->nesqp_context->tcpPorts[0] =
3538		cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3539	nesqp->nesqp_context->tcpPorts[1] =
3540		cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3541	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3542		nesqp->nesqp_context->ip0 =
3543			cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3544	else
3545		nesqp->nesqp_context->ip0 =
3546			cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3547
3548	nesqp->nesqp_context->misc2 |= cpu_to_le32(
3549			(u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3550			NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3551	nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3552			nes_arp_table(nesdev,
3553			le32_to_cpu(nesqp->nesqp_context->ip0),
3554			NULL, NES_ARP_RESOLVE) << 16);
3555	nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3556			jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3557	nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3558	nesqp->nesqp_context->ird_ord_sizes |=
3559			cpu_to_le32((u32)1 <<
3560			NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3561
3562	/* Adjust tail for not having a LSMM */
3563	/*nesqp->hwqp.sq_tail = 1;*/
3564
3565	build_rdma0_msg(cm_node, &nesqp);
3566
3567	nes_write32(nesdev->regs + NES_WQE_ALLOC,
3568		    (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3569
3570	memset(&nes_quad, 0, sizeof(nes_quad));
3571
3572	nes_quad.DstIpAdrIndex =
3573		cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3574	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3575		nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3576	else
3577		nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3578	nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3579	nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3580
3581	/* Produce hash key */
3582	crc_value = get_crc_value(&nes_quad);
3583	nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3584	nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3585		  nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3586
3587	nesqp->hte_index &= nesadapter->hte_index_mask;
3588	nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3589
3590	nesqp->ietf_frame = &cm_node->mpa_frame;
3591	nesqp->private_data_len = (u8)cm_node->mpa_frame_size;
3592	cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3593
3594	/* notify OF layer we successfully created the requested connection */
3595	cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3596	cm_event.status = 0;
3597	cm_event.provider_data = cm_id->provider_data;
3598	cm_event.local_addr.sin_family = AF_INET;
3599	cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3600	cm_event.remote_addr = cm_id->remote_addr;
3601
3602	cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3603	cm_event.private_data_len = (u8)event->cm_node->mpa_frame_size;
3604	cm_event.ird = cm_node->ird_size;
3605	cm_event.ord = cm_node->ord_size;
3606
3607	cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3608	ret = cm_id->event_handler(cm_id, &cm_event);
3609	nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3610
3611	if (ret)
3612		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3613		       "ret=%d\n", __func__, __LINE__, ret);
3614	attr.qp_state = IB_QPS_RTS;
3615	nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3616
3617	nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3618		  "%lu\n", nesqp->hwqp.qp_id, jiffies);
3619
3620	return;
3621}
3622
3623
3624/**
3625 * cm_event_connect_error
3626 */
3627static void cm_event_connect_error(struct nes_cm_event *event)
3628{
3629	struct nes_qp *nesqp;
3630	struct iw_cm_id *cm_id;
3631	struct iw_cm_event cm_event;
3632	/* struct nes_cm_info cm_info; */
3633	int ret;
3634
3635	if (!event->cm_node)
3636		return;
3637
3638	cm_id = event->cm_node->cm_id;
3639	if (!cm_id)
3640		return;
3641
3642	nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3643	nesqp = cm_id->provider_data;
3644
3645	if (!nesqp)
3646		return;
3647
3648	/* notify OF layer about this connection error event */
3649	/* cm_id->rem_ref(cm_id); */
3650	nesqp->cm_id = NULL;
3651	cm_id->provider_data = NULL;
3652	cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3653	cm_event.status = -ECONNRESET;
3654	cm_event.provider_data = cm_id->provider_data;
3655	cm_event.local_addr = cm_id->local_addr;
3656	cm_event.remote_addr = cm_id->remote_addr;
3657	cm_event.private_data = NULL;
3658	cm_event.private_data_len = 0;
3659
3660	nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3661		  "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3662		  cm_event.remote_addr.sin_addr.s_addr);
3663
3664	ret = cm_id->event_handler(cm_id, &cm_event);
3665	nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3666	if (ret)
3667		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3668		       "ret=%d\n", __func__, __LINE__, ret);
3669	cm_id->rem_ref(cm_id);
3670
3671	rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3672	return;
3673}
3674
3675
3676/**
3677 * cm_event_reset
3678 */
3679static void cm_event_reset(struct nes_cm_event *event)
3680{
3681	struct nes_qp *nesqp;
3682	struct iw_cm_id *cm_id;
3683	struct iw_cm_event cm_event;
3684	/* struct nes_cm_info cm_info; */
3685	int ret;
3686
3687	if (!event->cm_node)
3688		return;
3689
3690	if (!event->cm_node->cm_id)
3691		return;
3692
3693	cm_id = event->cm_node->cm_id;
3694
3695	nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3696	nesqp = cm_id->provider_data;
3697	if (!nesqp)
3698		return;
3699
3700	nesqp->cm_id = NULL;
3701	/* cm_id->provider_data = NULL; */
3702	cm_event.event = IW_CM_EVENT_DISCONNECT;
3703	cm_event.status = -ECONNRESET;
3704	cm_event.provider_data = cm_id->provider_data;
3705	cm_event.local_addr = cm_id->local_addr;
3706	cm_event.remote_addr = cm_id->remote_addr;
3707	cm_event.private_data = NULL;
3708	cm_event.private_data_len = 0;
3709
3710	cm_id->add_ref(cm_id);
3711	ret = cm_id->event_handler(cm_id, &cm_event);
3712	atomic_inc(&cm_closes);
3713	cm_event.event = IW_CM_EVENT_CLOSE;
3714	cm_event.status = 0;
3715	cm_event.provider_data = cm_id->provider_data;
3716	cm_event.local_addr = cm_id->local_addr;
3717	cm_event.remote_addr = cm_id->remote_addr;
3718	cm_event.private_data = NULL;
3719	cm_event.private_data_len = 0;
3720	nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3721	ret = cm_id->event_handler(cm_id, &cm_event);
3722
3723	nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3724
3725
3726	/* notify OF layer about this connection error event */
3727	cm_id->rem_ref(cm_id);
3728
3729	return;
3730}
3731
3732
3733/**
3734 * cm_event_mpa_req
3735 */
3736static void cm_event_mpa_req(struct nes_cm_event *event)
3737{
3738	struct iw_cm_id *cm_id;
3739	struct iw_cm_event cm_event;
3740	int ret;
3741	struct nes_cm_node *cm_node;
3742
3743	cm_node = event->cm_node;
3744	if (!cm_node)
3745		return;
3746	cm_id = cm_node->cm_id;
3747
3748	atomic_inc(&cm_connect_reqs);
3749	nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3750		  cm_node, cm_id, jiffies);
3751
3752	cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3753	cm_event.status = 0;
3754	cm_event.provider_data = (void *)cm_node;
3755
3756	cm_event.local_addr.sin_family = AF_INET;
3757	cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3758	cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3759
3760	cm_event.remote_addr.sin_family = AF_INET;
3761	cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3762	cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3763	cm_event.private_data = cm_node->mpa_frame_buf;
3764	cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3765	cm_event.ird = cm_node->ird_size;
3766	cm_event.ord = cm_node->ord_size;
3767
3768	ret = cm_id->event_handler(cm_id, &cm_event);
3769	if (ret)
3770		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3771		       __func__, __LINE__, ret);
3772	return;
3773}
3774
3775
3776static void cm_event_mpa_reject(struct nes_cm_event *event)
3777{
3778	struct iw_cm_id *cm_id;
3779	struct iw_cm_event cm_event;
3780	struct nes_cm_node *cm_node;
3781	int ret;
3782
3783	cm_node = event->cm_node;
3784	if (!cm_node)
3785		return;
3786	cm_id = cm_node->cm_id;
3787
3788	atomic_inc(&cm_connect_reqs);
3789	nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3790		  cm_node, cm_id, jiffies);
3791
3792	cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3793	cm_event.status = -ECONNREFUSED;
3794	cm_event.provider_data = cm_id->provider_data;
3795
3796	cm_event.local_addr.sin_family = AF_INET;
3797	cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3798	cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3799
3800	cm_event.remote_addr.sin_family = AF_INET;
3801	cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3802	cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3803
3804	cm_event.private_data = cm_node->mpa_frame_buf;
3805	cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3806
3807	nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3808		  "remove_addr=%08x\n",
3809		  cm_event.local_addr.sin_addr.s_addr,
3810		  cm_event.remote_addr.sin_addr.s_addr);
3811
3812	ret = cm_id->event_handler(cm_id, &cm_event);
3813	if (ret)
3814		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3815		       __func__, __LINE__, ret);
3816
3817	return;
3818}
3819
3820
3821static void nes_cm_event_handler(struct work_struct *);
3822
3823/**
3824 * nes_cm_post_event
3825 * post an event to the cm event handler
3826 */
3827static int nes_cm_post_event(struct nes_cm_event *event)
3828{
3829	atomic_inc(&event->cm_node->cm_core->events_posted);
3830	add_ref_cm_node(event->cm_node);
3831	event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3832	INIT_WORK(&event->event_work, nes_cm_event_handler);
3833	nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3834		  event->cm_node, event);
3835
3836	queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3837
3838	nes_debug(NES_DBG_CM, "Exit\n");
3839	return 0;
3840}
3841
3842
3843/**
3844 * nes_cm_event_handler
3845 * worker function to handle cm events
3846 * will free instance of nes_cm_event
3847 */
3848static void nes_cm_event_handler(struct work_struct *work)
3849{
3850	struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3851						  event_work);
3852	struct nes_cm_core *cm_core;
3853
3854	if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3855		return;
3856
3857	cm_core = event->cm_node->cm_core;
3858	nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3859		  event, event->type, atomic_read(&cm_core->events_posted));
3860
3861	switch (event->type) {
3862	case NES_CM_EVENT_MPA_REQ:
3863		cm_event_mpa_req(event);
3864		nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3865			  event->cm_node);
3866		break;
3867	case NES_CM_EVENT_RESET:
3868		nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3869			  event->cm_node);
3870		cm_event_reset(event);
3871		break;
3872	case NES_CM_EVENT_CONNECTED:
3873		if ((!event->cm_node->cm_id) ||
3874		    (event->cm_node->state != NES_CM_STATE_TSA))
3875			break;
3876		cm_event_connected(event);
3877		nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3878		break;
3879	case NES_CM_EVENT_MPA_REJECT:
3880		if ((!event->cm_node->cm_id) ||
3881		    (event->cm_node->state == NES_CM_STATE_TSA))
3882			break;
3883		cm_event_mpa_reject(event);
3884		nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3885		break;
3886
3887	case NES_CM_EVENT_ABORTED:
3888		if ((!event->cm_node->cm_id) ||
3889		    (event->cm_node->state == NES_CM_STATE_TSA))
3890			break;
3891		cm_event_connect_error(event);
3892		nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3893		break;
3894	case NES_CM_EVENT_DROPPED_PKT:
3895		nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3896		break;
3897	default:
3898		nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3899		break;
3900	}
3901
3902	atomic_dec(&cm_core->events_posted);
3903	event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3904	rem_ref_cm_node(cm_core, event->cm_node);
3905	kfree(event);
3906
3907	return;
3908}