nes_cm.c 101.5 KB
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/*
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 * Copyright (c) 2006 - 2009 Intel Corporation.  All rights reserved.
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 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */


#define TCPOPT_TIMESTAMP 8

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

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

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static inline int mini_cm_accelerated(struct nes_cm_core *,
	struct nes_cm_node *);
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static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
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	struct nes_vnic *, struct nes_cm_info *);
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static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
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static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
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	struct nes_vnic *, u16, void *, struct nes_cm_info *);
static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
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static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
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	struct nes_cm_node *);
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static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
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	struct nes_cm_node *);
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static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
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	struct sk_buff *);
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static int mini_cm_dealloc_core(struct nes_cm_core *);
static int mini_cm_get(struct nes_cm_core *);
static int mini_cm_set(struct nes_cm_core *, u32, u32);
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static void form_cm_frame(struct sk_buff *, struct nes_cm_node *,
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	void *, u32, void *, u32, u8);
static int add_ref_cm_node(struct nes_cm_node *);
static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);

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static int nes_cm_disconn_true(struct nes_qp *);
static int nes_cm_post_event(struct nes_cm_event *event);
static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
static void nes_disconnect_worker(struct work_struct *work);
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static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
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static int send_mpa_reject(struct nes_cm_node *);
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static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
static int send_reset(struct nes_cm_node *, struct sk_buff *);
static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
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static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
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static void process_packet(struct nes_cm_node *, struct sk_buff *,
	struct nes_cm_core *);

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

/* CM event handler functions */
static void cm_event_connected(struct nes_cm_event *);
static void cm_event_connect_error(struct nes_cm_event *);
static void cm_event_reset(struct nes_cm_event *);
static void cm_event_mpa_req(struct nes_cm_event *);
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static void cm_event_mpa_reject(struct nes_cm_event *);
static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
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static void print_core(struct nes_cm_core *core);
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/* External CM API Interface */
/* instance of function pointers for client API */
/* set address of this instance to cm_core->cm_ops at cm_core alloc */
static struct nes_cm_ops nes_cm_api = {
	mini_cm_accelerated,
	mini_cm_listen,
	mini_cm_del_listen,
	mini_cm_connect,
	mini_cm_close,
	mini_cm_accept,
	mini_cm_reject,
	mini_cm_recv_pkt,
	mini_cm_dealloc_core,
	mini_cm_get,
	mini_cm_set
};

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static struct nes_cm_core *g_cm_core;
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atomic_t cm_connects;
atomic_t cm_accepts;
atomic_t cm_disconnects;
atomic_t cm_closes;
atomic_t cm_connecteds;
atomic_t cm_connect_reqs;
atomic_t cm_rejects;


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

	if (!cm_node->cm_id)
		return NULL;

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

	if (!event)
		return NULL;

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

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


/**
 * send_mpa_request
 */
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static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
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{
	if (!skb) {
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		nes_debug(NES_DBG_CM, "skb set to NULL\n");
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		return -1;
	}

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

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	return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
}
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static int send_mpa_reject(struct nes_cm_node *cm_node)
{
	struct sk_buff  *skb = NULL;

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

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

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


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

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	*type = NES_MPA_REQUEST_ACCEPT;

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

	mpa_frame = (struct ietf_mpa_frame *)buffer;
	cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
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	/* make sure mpa private data len is less than 512 bytes */
	if (cm_node->mpa_frame_size > IETF_MAX_PRIV_DATA_LEN) {
		nes_debug(NES_DBG_CM, "The received Length of Private"
			" Data field exceeds 512 octets\n");
		return -EINVAL;
	}
	/*
	 * make sure MPA receiver interoperate with the
	 * received MPA version and MPA key information
	 *
	 */
	if (mpa_frame->rev != mpa_version) {
		nes_debug(NES_DBG_CM, "The received mpa version"
				" can not be interoperated\n");
		return -EINVAL;
	}
	if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
		if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
			nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
			return -EINVAL;
		}
	} else {
		if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
			nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
			return -EINVAL;
		}
	}
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	if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
		nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
				" complete (%x + %x != %x)\n",
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				cm_node->mpa_frame_size,
				(u32)sizeof(struct ietf_mpa_frame), len);
		return -EINVAL;
	}
	/* make sure it does not exceed the max size */
	if (len > MAX_CM_BUFFER) {
		nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
				" (%x + %x != %x)\n",
				cm_node->mpa_frame_size,
				(u32)sizeof(struct ietf_mpa_frame), len);
		return -EINVAL;
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	}

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

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


/**
 * form_cm_frame - get a free packet and build empty frame Use
 * node info to build.
 */
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static void form_cm_frame(struct sk_buff *skb,
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	struct nes_cm_node *cm_node, void *options, u32 optionsize,
	void *data, u32 datasize, u8 flags)
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{
	struct tcphdr *tcph;
	struct iphdr *iph;
	struct ethhdr *ethh;
	u8 *buf;
	u16 packetsize = sizeof(*iph);

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

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

	skb->len = 0;
	buf = skb_put(skb, packetsize + ETH_HLEN);

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

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

	skb->ip_summed = CHECKSUM_PARTIAL;
	skb->protocol = htons(0x800);
	skb->data_len = 0;
	skb->mac_len = ETH_HLEN;

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

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

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

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

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

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

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

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

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

}


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

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

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

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

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


/**
 * schedule_nes_timer
 * note - cm_node needs to be protected before calling this. Encase in:
 *			rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
 */
int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
		enum nes_timer_type type, int send_retrans,
		int close_when_complete)
{
	unsigned long  flags;
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	struct nes_cm_core *cm_core = cm_node->cm_core;
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	struct nes_timer_entry *new_send;
	int ret = 0;
	u32 was_timer_set;

	new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
	if (!new_send)
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		return -ENOMEM;
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	/* new_send->timetosend = currenttime */
	new_send->retrycount = NES_DEFAULT_RETRYS;
	new_send->retranscount = NES_DEFAULT_RETRANS;
	new_send->skb = skb;
	new_send->timetosend = jiffies;
	new_send->type = type;
	new_send->netdev = cm_node->netdev;
	new_send->send_retrans = send_retrans;
	new_send->close_when_complete = close_when_complete;

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

	if (type == NES_TIMER_TYPE_SEND) {
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		new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
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		atomic_inc(&new_send->skb->users);
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		spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
		cm_node->send_entry = new_send;
		add_ref_cm_node(cm_node);
		spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
		new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
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		ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
		if (ret != NETDEV_TX_OK) {
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			nes_debug(NES_DBG_CM, "Error sending packet %p "
				"(jiffies = %lu)\n", new_send, jiffies);
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			new_send->timetosend = jiffies;
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			ret = NETDEV_TX_OK;
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		} else {
			cm_packets_sent++;
			if (!send_retrans) {
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				cleanup_retrans_entry(cm_node);
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				if (close_when_complete)
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					rem_ref_cm_node(cm_core, cm_node);
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				return ret;
			}
		}
	}

	was_timer_set = timer_pending(&cm_core->tcp_timer);

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

	return ret;
}

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static void nes_retrans_expired(struct nes_cm_node *cm_node)
{
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	struct iw_cm_id *cm_id = cm_node->cm_id;
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	switch (cm_node->state) {
	case NES_CM_STATE_SYN_RCVD:
	case NES_CM_STATE_CLOSING:
		rem_ref_cm_node(cm_node->cm_core, cm_node);
		break;
	case NES_CM_STATE_LAST_ACK:
	case NES_CM_STATE_FIN_WAIT1:
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		if (cm_node->cm_id)
			cm_id->rem_ref(cm_id);
		cm_node->state = NES_CM_STATE_CLOSED;
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		send_reset(cm_node, NULL);
		break;
	default:
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		add_ref_cm_node(cm_node);
		send_reset(cm_node, NULL);
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		create_event(cm_node, NES_CM_EVENT_ABORTED);
	}
}

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

	if (!recv_entry)
		return;
	nesqp = (struct nes_qp *)recv_entry->skb;
	if (nesqp) {
		spin_lock_irqsave(&nesqp->lock, qplockflags);
		if (nesqp->cm_id) {
			nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
				"refcount = %d: HIT A "
				"NES_TIMER_TYPE_CLOSE with something "
				"to do!!!\n", nesqp->hwqp.qp_id, cm_id,
				atomic_read(&nesqp->refcount));
			nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
			nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
			nesqp->ibqp_state = IB_QPS_ERR;
			spin_unlock_irqrestore(&nesqp->lock, qplockflags);
			nes_cm_disconn(nesqp);
		} else {
			spin_unlock_irqrestore(&nesqp->lock, qplockflags);
			nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
				"refcount = %d: HIT A "
				"NES_TIMER_TYPE_CLOSE with nothing "
				"to do!!!\n", nesqp->hwqp.qp_id, cm_id,
				atomic_read(&nesqp->refcount));
		}
	} else if (rem_node) {
		/* TIME_WAIT state */
		rem_ref_cm_node(cm_node->cm_core, cm_node);
	}
	if (cm_node->cm_id)
		cm_id->rem_ref(cm_id);
	kfree(recv_entry);
	cm_node->recv_entry = NULL;
}
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/**
 * nes_cm_timer_tick
 */
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static void nes_cm_timer_tick(unsigned long pass)
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{
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	unsigned long flags;
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	unsigned long nexttimeout = jiffies + NES_LONG_TIME;
	struct nes_cm_node *cm_node;
	struct nes_timer_entry *send_entry, *recv_entry;
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	struct list_head *list_core_temp;
	struct list_head *list_node;
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	struct nes_cm_core *cm_core = g_cm_core;
	u32 settimer = 0;
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	unsigned long timetosend;
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	int ret = NETDEV_TX_OK;

581 582
	struct list_head timer_list;
	INIT_LIST_HEAD(&timer_list);
583 584
	spin_lock_irqsave(&cm_core->ht_lock, flags);

585
	list_for_each_safe(list_node, list_core_temp,
586
				&cm_core->connected_nodes) {
587
		cm_node = container_of(list_node, struct nes_cm_node, list);
588
		if ((cm_node->recv_entry) || (cm_node->send_entry)) {
589 590 591 592 593 594 595 596 597
			add_ref_cm_node(cm_node);
			list_add(&cm_node->timer_entry, &timer_list);
		}
	}
	spin_unlock_irqrestore(&cm_core->ht_lock, flags);

	list_for_each_safe(list_node, list_core_temp, &timer_list) {
		cm_node = container_of(list_node, struct nes_cm_node,
					timer_entry);
598 599 600
		recv_entry = cm_node->recv_entry;

		if (recv_entry) {
601 602
			if (time_after(recv_entry->timetosend, jiffies)) {
				if (nexttimeout > recv_entry->timetosend ||
603
						!settimer) {
604 605 606
					nexttimeout = recv_entry->timetosend;
					settimer = 1;
				}
607 608
			} else
				handle_recv_entry(cm_node, 1);
609 610 611
		}

		spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
612 613 614
		do {
			send_entry = cm_node->send_entry;
			if (!send_entry)
615
				break;
616 617
			if (time_after(send_entry->timetosend, jiffies)) {
				if (cm_node->state != NES_CM_STATE_TSA) {
618 619 620 621 622
					if ((nexttimeout >
						send_entry->timetosend) ||
						!settimer) {
						nexttimeout =
							send_entry->timetosend;
623 624 625
						settimer = 1;
					}
				} else {
626
					free_retrans_entry(cm_node);
627
				}
628
				break;
629
			}
630 631 632 633

			if ((cm_node->state == NES_CM_STATE_TSA) ||
				(cm_node->state == NES_CM_STATE_CLOSED)) {
				free_retrans_entry(cm_node);
634
				break;
635 636
			}

637 638
			if (!send_entry->retranscount ||
				!send_entry->retrycount) {
639
				cm_packets_dropped++;
640
				free_retrans_entry(cm_node);
641

642 643
				spin_unlock_irqrestore(
					&cm_node->retrans_list_lock, flags);
644 645
				nes_retrans_expired(cm_node);
				cm_node->state = NES_CM_STATE_CLOSED;
646 647
				spin_lock_irqsave(&cm_node->retrans_list_lock,
					flags);
648
				break;
649 650 651
			}
			atomic_inc(&send_entry->skb->users);
			cm_packets_retrans++;
652 653 654 655 656 657 658 659 660 661 662 663
			nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
				"for node %p, jiffies = %lu, time to send = "
				"%lu, retranscount = %u, send_entry->seq_num = "
				"0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
				"0x%08X\n", send_entry, cm_node, jiffies,
				send_entry->timetosend,
				send_entry->retranscount,
				send_entry->seq_num,
				cm_node->tcp_cntxt.rem_ack_num);

			spin_unlock_irqrestore(&cm_node->retrans_list_lock,
				flags);
664
			ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
665
			spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
666
			if (ret != NETDEV_TX_OK) {
667 668
				nes_debug(NES_DBG_CM, "rexmit failed for "
					"node=%p\n", cm_node);
669 670 671 672
				cm_packets_bounced++;
				send_entry->retrycount--;
				nexttimeout = jiffies + NES_SHORT_TIME;
				settimer = 1;
673
				break;
674 675 676
			} else {
				cm_packets_sent++;
			}
677 678 679 680
			nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
				"%u, retry count = %u.\n",
				send_entry->retranscount,
				send_entry->retrycount);
681 682
			if (send_entry->send_retrans) {
				send_entry->retranscount--;
683 684 685
				timetosend = (NES_RETRY_TIMEOUT <<
					(NES_DEFAULT_RETRANS - send_entry->retranscount));

686
				send_entry->timetosend = jiffies +
687
					min(timetosend, NES_MAX_TIMEOUT);
688 689
				if (nexttimeout > send_entry->timetosend ||
					!settimer) {
690 691 692 693 694
					nexttimeout = send_entry->timetosend;
					settimer = 1;
				}
			} else {
				int close_when_complete;
695 696 697 698 699 700 701 702
				close_when_complete =
					send_entry->close_when_complete;
				nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
					cm_node, cm_node->state);
				free_retrans_entry(cm_node);
				if (close_when_complete)
					rem_ref_cm_node(cm_node->cm_core,
						cm_node);
703
			}
704
		} while (0);
705

706 707
		spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
		rem_ref_cm_node(cm_node->cm_core, cm_node);
708 709 710 711 712 713 714 715 716 717 718 719 720 721
	}

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


/**
 * send_syn
 */
722 723
static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
	struct sk_buff *skb)
724 725 726 727
{
	int ret;
	int flags = SET_SYN;
	char optionsbuffer[sizeof(struct option_mss) +
728 729
		sizeof(struct option_windowscale) + sizeof(struct option_base) +
		TCP_OPTIONS_PADDING];
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749

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

	if (!cm_node)
		return -EINVAL;

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

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

750
	if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
		options = (union all_known_options *)&optionsbuffer[optionssize];
		options->as_base.optionnum = OPTION_NUMBER_WRITE0;
		options->as_base.length = sizeof(struct option_base);
		optionssize += sizeof(struct option_base);
		/* we need the size to be a multiple of 4 */
		options = (union all_known_options *)&optionsbuffer[optionssize];
		options->as_end = 1;
		optionssize += 1;
		options = (union all_known_options *)&optionsbuffer[optionssize];
		options->as_end = 1;
		optionssize += 1;
	}

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

768
	if (!skb)
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Faisal Latif 已提交
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		skb = dev_alloc_skb(MAX_CM_BUFFER);
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787
	if (!skb) {
		nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
		return -1;
	}

	if (sendack)
		flags |= SET_ACK;

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

	return ret;
}


/**
 * send_reset
 */
788
static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
789 790 791 792
{
	int ret;
	int flags = SET_RST | SET_ACK;

793
	if (!skb)
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Faisal Latif 已提交
794
		skb = dev_alloc_skb(MAX_CM_BUFFER);
795 796
	if (!skb) {
		nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
797
		return -ENOMEM;
798 799 800 801 802 803 804 805 806 807 808 809
	}

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

	return ret;
}


/**
 * send_ack
 */
810
static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
811 812
{
	int ret;
813 814

	if (!skb)
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		skb = dev_alloc_skb(MAX_CM_BUFFER);
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831

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

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

	return ret;
}


/**
 * send_fin
 */
832
static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
833 834 835 836 837
{
	int ret;

	/* if we didn't get a frame get one */
	if (!skb)
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		skb = dev_alloc_skb(MAX_CM_BUFFER);
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866

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

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

	return ret;
}


/**
 * find_node - find a cm node that matches the reference cm node
 */
static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
		u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
{
	unsigned long flags;
	struct list_head *hte;
	struct nes_cm_node *cm_node;

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

	/* walk list and find cm_node associated with this session ID */
	spin_lock_irqsave(&cm_core->ht_lock, flags);
867
	list_for_each_entry(cm_node, hte, list) {
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
		/* compare quad, return node handle if a match */
		nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
				cm_node->loc_addr, cm_node->loc_port,
				loc_addr, loc_port,
				cm_node->rem_addr, cm_node->rem_port,
				rem_addr, rem_port);
		if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
				(cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
			add_ref_cm_node(cm_node);
			spin_unlock_irqrestore(&cm_core->ht_lock, flags);
			return cm_node;
		}
	}
	spin_unlock_irqrestore(&cm_core->ht_lock, flags);

	/* no owner node */
	return NULL;
}


/**
 * find_listener - find a cm node listening on this addr-port pair
 */
static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
		nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
{
	unsigned long flags;
	struct nes_cm_listener *listen_node;

	/* walk list and find cm_node associated with this session ID */
	spin_lock_irqsave(&cm_core->listen_list_lock, flags);
899
	list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927
		/* compare node pair, return node handle if a match */
		if (((listen_node->loc_addr == dst_addr) ||
				listen_node->loc_addr == 0x00000000) &&
				(listen_node->loc_port == dst_port) &&
				(listener_state & listen_node->listener_state)) {
			atomic_inc(&listen_node->ref_count);
			spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
			return listen_node;
		}
	}
	spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);

	/* no listener */
	return NULL;
}


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

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

928 929
	nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
		cm_node);
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947

	spin_lock_irqsave(&cm_core->ht_lock, flags);

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

	spin_unlock_irqrestore(&cm_core->ht_lock, flags);

	return 0;
}


/**
 * mini_cm_dec_refcnt_listen
 */
static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
948
	struct nes_cm_listener *listener, int free_hanging_nodes)
949
{
950 951
	int ret = -EINVAL;
	int err = 0;
952
	unsigned long flags;
953 954 955
	struct list_head *list_pos = NULL;
	struct list_head *list_temp = NULL;
	struct nes_cm_node *cm_node = NULL;
956
	struct list_head reset_list;
957 958 959 960 961

	nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
		"refcnt=%d\n", listener, free_hanging_nodes,
		atomic_read(&listener->ref_count));
	/* free non-accelerated child nodes for this listener */
962
	INIT_LIST_HEAD(&reset_list);
963 964 965
	if (free_hanging_nodes) {
		spin_lock_irqsave(&cm_core->ht_lock, flags);
		list_for_each_safe(list_pos, list_temp,
966
				   &g_cm_core->connected_nodes) {
967 968 969
			cm_node = container_of(list_pos, struct nes_cm_node,
				list);
			if ((cm_node->listener == listener) &&
970 971 972
			    (!cm_node->accelerated)) {
				add_ref_cm_node(cm_node);
				list_add(&cm_node->reset_entry, &reset_list);
973 974 975 976
			}
		}
		spin_unlock_irqrestore(&cm_core->ht_lock, flags);
	}
977 978 979

	list_for_each_safe(list_pos, list_temp, &reset_list) {
		cm_node = container_of(list_pos, struct nes_cm_node,
980 981 982
				reset_entry);
		{
			struct nes_cm_node *loopback = cm_node->loopbackpartner;
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Faisal Latif 已提交
983
			enum nes_cm_node_state old_state;
984 985 986 987 988 989 990 991 992 993 994
			if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
				rem_ref_cm_node(cm_node->cm_core, cm_node);
			} else {
				if (!loopback) {
					cleanup_retrans_entry(cm_node);
					err = send_reset(cm_node, NULL);
					if (err) {
						cm_node->state =
							 NES_CM_STATE_CLOSED;
						WARN_ON(1);
					} else {
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Faisal Latif 已提交
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						old_state = cm_node->state;
						cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
						if (old_state != NES_CM_STATE_MPAREQ_RCVD)
							rem_ref_cm_node(
								cm_node->cm_core,
								cm_node);
1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
					}
				} else {
					struct nes_cm_event event;

					event.cm_node = loopback;
					event.cm_info.rem_addr =
							loopback->rem_addr;
					event.cm_info.loc_addr =
							loopback->loc_addr;
					event.cm_info.rem_port =
							loopback->rem_port;
					event.cm_info.loc_port =
							 loopback->loc_port;
					event.cm_info.cm_id = loopback->cm_id;
1015 1016
					add_ref_cm_node(loopback);
					loopback->state = NES_CM_STATE_CLOSED;
1017
					cm_event_connect_error(&event);
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Faisal Latif 已提交
1018
					cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1019 1020 1021 1022 1023 1024 1025

					rem_ref_cm_node(cm_node->cm_core,
							 cm_node);

				}
			}
		}
1026 1027
	}

1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
	spin_lock_irqsave(&cm_core->listen_list_lock, flags);
	if (!atomic_dec_return(&listener->ref_count)) {
		list_del(&listener->list);

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

		spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);

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

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

		kfree(listener);
1045
		listener = NULL;
1046
		ret = 0;
1047
		atomic_inc(&cm_listens_destroyed);
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
	} else {
		spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
	}
	if (listener) {
		if (atomic_read(&listener->pend_accepts_cnt) > 0)
			nes_debug(NES_DBG_CM, "destroying listener (%p)"
					" with non-zero pending accepts=%u\n",
					listener, atomic_read(&listener->pend_accepts_cnt));
	}

	return ret;
}


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


/**
 * mini_cm_accelerated
 */
static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
		struct nes_cm_node *cm_node)
{
	u32 was_timer_set;
	cm_node->accelerated = 1;

	if (cm_node->accept_pend) {
		BUG_ON(!cm_node->listener);
		atomic_dec(&cm_node->listener->pend_accepts_cnt);
1086
		cm_node->accept_pend = 0;
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
		BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
	}

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

	return 0;
}


/**
B
Bob Sharp 已提交
1101
 * nes_addr_resolve_neigh
1102
 */
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1103
static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1104 1105 1106
{
	struct rtable *rt;
	struct flowi fl;
B
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1107
	struct neighbour *neigh;
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1108 1109
	int rc = arpindex;
	struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1110 1111 1112 1113

	memset(&fl, 0, sizeof fl);
	fl.nl_u.ip4_u.daddr = htonl(dst_ip);
	if (ip_route_output_key(&init_net, &rt, &fl)) {
1114
		printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1115
				__func__, dst_ip);
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		return rc;
1117 1118
	}

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1119 1120 1121 1122
	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
	if (neigh) {
		if (neigh->nud_state & NUD_VALID) {
			nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
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Johannes Berg 已提交
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				  " is %pM, Gateway is 0x%08X \n", dst_ip,
				  neigh->ha, ntohl(rt->rt_gateway));
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1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139

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

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

B
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1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
			nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
					     dst_ip, NES_ARP_ADD);
			rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
					   NES_ARP_RESOLVE);
		}
		neigh_release(neigh);
	}

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

1151
	ip_rt_put(rt);
B
Bob Sharp 已提交
1152
	return rc;
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
}

/**
 * make_cm_node - create a new instance of a cm node
 */
static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
		struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
		struct nes_cm_listener *listener)
{
	struct nes_cm_node *cm_node;
	struct timespec ts;
F
Faisal Latif 已提交
1164
	int oldarpindex = 0;
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
	int arpindex = 0;
	struct nes_device *nesdev;
	struct nes_adapter *nesadapter;

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

	/* set our node specific transport info */
	cm_node->loc_addr = cm_info->loc_addr;
	cm_node->rem_addr = cm_info->rem_addr;
	cm_node->loc_port = cm_info->loc_port;
	cm_node->rem_port = cm_info->rem_port;
	cm_node->send_write0 = send_first;
H
Harvey Harrison 已提交
1180 1181 1182
	nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
		  &cm_node->loc_addr, cm_node->loc_port,
		  &cm_node->rem_addr, cm_node->rem_port);
1183 1184 1185 1186 1187
	cm_node->listener = listener;
	cm_node->netdev = nesvnic->netdev;
	cm_node->cm_id = cm_info->cm_id;
	memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);

1188 1189
	nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
			cm_node->cm_id);
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203

	spin_lock_init(&cm_node->retrans_list_lock);

	cm_node->loopbackpartner = NULL;
	atomic_set(&cm_node->ref_count, 1);
	/* associate our parent CM core */
	cm_node->cm_core = cm_core;
	cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
	cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
	cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
			NES_CM_DEFAULT_RCV_WND_SCALE;
	ts = current_kernel_time();
	cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
	cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1204
			sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217
	cm_node->tcp_cntxt.rcv_nxt = 0;
	/* get a unique session ID , add thread_id to an upcounter to handle race */
	atomic_inc(&cm_core->node_cnt);
	cm_node->conn_type = cm_info->conn_type;
	cm_node->apbvt_set = 0;
	cm_node->accept_pend = 0;

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

	cm_node->loopbackpartner = NULL;
F
Faisal Latif 已提交
1218

1219
	/* get the mac addr for the remote node */
1220 1221
	if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
		arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
F
Faisal Latif 已提交
1222 1223 1224 1225 1226
	else {
		oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
		arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr, oldarpindex);

	}
1227
	if (arpindex < 0) {
F
Faisal Latif 已提交
1228 1229
		kfree(cm_node);
		return NULL;
1230 1231 1232 1233
	}

	/* copy the mac addr to node context */
	memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
J
Johannes Berg 已提交
1234 1235
	nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
		  cm_node->rem_mac);
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257

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

	return cm_node;
}


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


/**
 * rem_ref_cm_node - destroy an instance of a cm node
 */
static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1258
	struct nes_cm_node *cm_node)
1259
{
1260
	unsigned long flags;
1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280
	struct nes_qp *nesqp;

	if (!cm_node)
		return -EINVAL;

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

	/* if the node is destroyed before connection was accelerated */
	if (!cm_node->accelerated && cm_node->accept_pend) {
		BUG_ON(!cm_node->listener);
		atomic_dec(&cm_node->listener->pend_accepts_cnt);
		BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
	}
1281 1282 1283
	WARN_ON(cm_node->send_entry);
	if (cm_node->recv_entry)
		handle_recv_entry(cm_node, 0);
1284 1285 1286 1287 1288
	if (cm_node->listener) {
		mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
	} else {
		if (cm_node->apbvt_set && cm_node->nesvnic) {
			nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1289 1290 1291
				PCI_FUNC(
				cm_node->nesvnic->nesdev->pcidev->devfn),
				NES_MANAGE_APBVT_DEL);
1292 1293 1294 1295 1296
		}
	}

	atomic_dec(&cm_core->node_cnt);
	atomic_inc(&cm_nodes_destroyed);
1297 1298 1299 1300 1301 1302
	nesqp = cm_node->nesqp;
	if (nesqp) {
		nesqp->cm_node = NULL;
		nes_rem_ref(&nesqp->ibqp);
		cm_node->nesqp = NULL;
	}
1303

1304
	kfree(cm_node);
1305 1306 1307 1308 1309 1310
	return 0;
}

/**
 * process_options
 */
1311 1312
static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
	u32 optionsize, u32 syn_packet)
1313 1314 1315 1316 1317 1318 1319 1320 1321
{
	u32 tmp;
	u32 offset = 0;
	union all_known_options *all_options;
	char got_mss_option = 0;

	while (offset < optionsize) {
		all_options = (union all_known_options *)(optionsloc + offset);
		switch (all_options->as_base.optionnum) {
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352
		case OPTION_NUMBER_END:
			offset = optionsize;
			break;
		case OPTION_NUMBER_NONE:
			offset += 1;
			continue;
		case OPTION_NUMBER_MSS:
			nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
				"Size: %d\n", __func__,
				all_options->as_mss.length, offset, optionsize);
			got_mss_option = 1;
			if (all_options->as_mss.length != 4) {
				return 1;
			} else {
				tmp = ntohs(all_options->as_mss.mss);
				if (tmp > 0 && tmp <
					cm_node->tcp_cntxt.mss)
					cm_node->tcp_cntxt.mss = tmp;
			}
			break;
		case OPTION_NUMBER_WINDOW_SCALE:
			cm_node->tcp_cntxt.snd_wscale =
				all_options->as_windowscale.shiftcount;
			break;
		case OPTION_NUMBER_WRITE0:
			cm_node->send_write0 = 1;
			break;
		default:
			nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
				all_options->as_base.optionnum);
			break;
1353 1354 1355 1356 1357 1358 1359 1360
		}
		offset += all_options->as_base.length;
	}
	if ((!got_mss_option) && (syn_packet))
		cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
	return 0;
}

1361 1362 1363 1364 1365
static void drop_packet(struct sk_buff *skb)
{
	atomic_inc(&cm_accel_dropped_pkts);
	dev_kfree_skb_any(skb);
}
1366

1367
static void handle_fin_pkt(struct nes_cm_node *cm_node)
1368
{
1369 1370 1371 1372 1373 1374 1375
	nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
		"refcnt=%d\n", cm_node, cm_node->state,
		atomic_read(&cm_node->ref_count));
	switch (cm_node->state) {
	case NES_CM_STATE_SYN_RCVD:
	case NES_CM_STATE_SYN_SENT:
	case NES_CM_STATE_ESTABLISHED:
1376
	case NES_CM_STATE_MPAREJ_RCVD:
1377 1378
		cm_node->tcp_cntxt.rcv_nxt++;
		cleanup_retrans_entry(cm_node);
1379
		cm_node->state = NES_CM_STATE_LAST_ACK;
1380
		send_fin(cm_node, NULL);
1381
		break;
1382 1383 1384 1385 1386 1387 1388 1389
	case NES_CM_STATE_MPAREQ_SENT:
		create_event(cm_node, NES_CM_EVENT_ABORTED);
		cm_node->tcp_cntxt.rcv_nxt++;
		cleanup_retrans_entry(cm_node);
		cm_node->state = NES_CM_STATE_CLOSED;
		add_ref_cm_node(cm_node);
		send_reset(cm_node, NULL);
		break;
1390
	case NES_CM_STATE_FIN_WAIT1:
1391 1392
		cm_node->tcp_cntxt.rcv_nxt++;
		cleanup_retrans_entry(cm_node);
1393
		cm_node->state = NES_CM_STATE_CLOSING;
1394 1395 1396 1397
		send_ack(cm_node, NULL);
		/* Wait for ACK as this is simultanous close..
		* After we receive ACK, do not send anything..
		* Just rm the node.. Done.. */
1398 1399
		break;
	case NES_CM_STATE_FIN_WAIT2:
1400 1401
		cm_node->tcp_cntxt.rcv_nxt++;
		cleanup_retrans_entry(cm_node);
1402
		cm_node->state = NES_CM_STATE_TIME_WAIT;
1403 1404 1405 1406
		send_ack(cm_node, NULL);
		schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
		break;
	case NES_CM_STATE_TIME_WAIT:
1407 1408
		cm_node->tcp_cntxt.rcv_nxt++;
		cleanup_retrans_entry(cm_node);
1409
		cm_node->state = NES_CM_STATE_CLOSED;
1410
		rem_ref_cm_node(cm_node->cm_core, cm_node);
1411 1412 1413 1414 1415 1416
		break;
	case NES_CM_STATE_TSA:
	default:
		nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
			cm_node, cm_node->state);
		break;
1417
	}
1418
}
1419 1420


1421 1422 1423
static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
	struct tcphdr *tcph)
{
1424

1425
	int	reset = 0;	/* whether to send reset in case of err.. */
1426
	int	passive_state;
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439
	atomic_inc(&cm_resets_recvd);
	nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
			" refcnt=%d\n", cm_node, cm_node->state,
			atomic_read(&cm_node->ref_count));
	cleanup_retrans_entry(cm_node);
	switch (cm_node->state) {
	case NES_CM_STATE_SYN_SENT:
	case NES_CM_STATE_MPAREQ_SENT:
		nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
			"listener=%p state=%d\n", __func__, __LINE__, cm_node,
			cm_node->listener, cm_node->state);
		active_open_err(cm_node, skb, reset);
		break;
1440 1441 1442 1443 1444 1445 1446
	case NES_CM_STATE_MPAREQ_RCVD:
		passive_state = atomic_add_return(1, &cm_node->passive_state);
		if (passive_state ==  NES_SEND_RESET_EVENT)
			create_event(cm_node, NES_CM_EVENT_RESET);
		cm_node->state = NES_CM_STATE_CLOSED;
		dev_kfree_skb_any(skb);
		break;
1447 1448 1449 1450 1451 1452 1453
	case NES_CM_STATE_ESTABLISHED:
	case NES_CM_STATE_SYN_RCVD:
	case NES_CM_STATE_LISTENING:
		nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
		passive_open_err(cm_node, skb, reset);
		break;
	case NES_CM_STATE_TSA:
1454 1455 1456 1457 1458
		active_open_err(cm_node, skb, reset);
		break;
	case NES_CM_STATE_CLOSED:
		drop_packet(skb);
		break;
1459
	case NES_CM_STATE_FIN_WAIT1:
1460 1461
	case NES_CM_STATE_LAST_ACK:
		cm_node->cm_id->rem_ref(cm_node->cm_id);
1462 1463 1464 1465 1466
	case NES_CM_STATE_TIME_WAIT:
		cm_node->state = NES_CM_STATE_CLOSED;
		rem_ref_cm_node(cm_node->cm_core, cm_node);
		drop_packet(skb);
		break;
1467
	default:
1468
		drop_packet(skb);
1469 1470 1471
		break;
	}
}
1472

1473 1474

static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1475 1476
{

1477
	int	ret = 0;
1478 1479
	int datasize = skb->len;
	u8 *dataloc = skb->data;
1480 1481 1482 1483 1484

	enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
	u32     res_type;
	ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
	if (ret) {
1485
		nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1486
		if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1487 1488 1489 1490 1491 1492 1493
			nes_debug(NES_DBG_CM, "%s[%u] create abort for "
				"cm_node=%p listener=%p state=%d\n", __func__,
				__LINE__, cm_node, cm_node->listener,
				cm_node->state);
			active_open_err(cm_node, skb, 1);
		} else {
			passive_open_err(cm_node, skb, 1);
1494
		}
1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511
		return;
	}

	switch (cm_node->state) {
	case NES_CM_STATE_ESTABLISHED:
		if (res_type == NES_MPA_REQUEST_REJECT) {
			/*BIG problem as we are receiving the MPA.. So should
			* not be REJECT.. This is Passive Open.. We can
			* only receive it Reject for Active Open...*/
			WARN_ON(1);
		}
		cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
		type = NES_CM_EVENT_MPA_REQ;
		atomic_set(&cm_node->passive_state,
				NES_PASSIVE_STATE_INDICATED);
		break;
	case NES_CM_STATE_MPAREQ_SENT:
1512
		cleanup_retrans_entry(cm_node);
1513 1514 1515 1516 1517
		if (res_type == NES_MPA_REQUEST_REJECT) {
			type = NES_CM_EVENT_MPA_REJECT;
			cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
		} else {
			type = NES_CM_EVENT_CONNECTED;
1518
			cm_node->state = NES_CM_STATE_TSA;
1519
		}
1520

1521 1522 1523 1524
		break;
	default:
		WARN_ON(1);
		break;
1525
	}
1526 1527
	dev_kfree_skb_any(skb);
	create_event(cm_node, type);
1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546
}

static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
{
	switch (cm_node->state) {
	case NES_CM_STATE_SYN_SENT:
	case NES_CM_STATE_MPAREQ_SENT:
		nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
			"listener=%p state=%d\n", __func__, __LINE__, cm_node,
			cm_node->listener, cm_node->state);
		active_open_err(cm_node, skb, 1);
		break;
	case NES_CM_STATE_ESTABLISHED:
	case NES_CM_STATE_SYN_RCVD:
		passive_open_err(cm_node, skb, 1);
		break;
	case NES_CM_STATE_TSA:
	default:
		drop_packet(skb);
1547
	}
1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575
}

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

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

	return err;
}

static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
	struct sk_buff *skb)
{
	int err = 0;
	u32 seq;
	u32 ack_seq;
	u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
	u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
	u32 rcv_wnd;
	seq = ntohl(tcph->seq);
	ack_seq = ntohl(tcph->ack_seq);
	rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
	if (ack_seq != loc_seq_num)
		err = 1;
1576
	else if (!between(seq, rcv_nxt, (rcv_nxt+rcv_wnd)))
1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601
		err = 1;
	if (err) {
		nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
			"listener=%p state=%d\n", __func__, __LINE__, cm_node,
			cm_node->listener, cm_node->state);
		indicate_pkt_err(cm_node, skb);
		nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
			"rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
			rcv_wnd);
	}
	return err;
}

/*
 * handle_syn_pkt() is for Passive node. The syn packet is received when a node
 * is created with a listener or it may comein as rexmitted packet which in
 * that case will be just dropped.
 */

static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
	struct tcphdr *tcph)
{
	int ret;
	u32 inc_sequence;
	int optionsize;
1602 1603

	optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1604
	skb_trim(skb, 0);
1605
	inc_sequence = ntohl(tcph->seq);
1606

1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631
	switch (cm_node->state) {
	case NES_CM_STATE_SYN_SENT:
	case NES_CM_STATE_MPAREQ_SENT:
		/* Rcvd syn on active open connection*/
		active_open_err(cm_node, skb, 1);
		break;
	case NES_CM_STATE_LISTENING:
		/* Passive OPEN */
		if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
				cm_node->listener->backlog) {
			nes_debug(NES_DBG_CM, "drop syn due to backlog "
				"pressure \n");
			cm_backlog_drops++;
			passive_open_err(cm_node, skb, 0);
			break;
		}
		ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
			1);
		if (ret) {
			passive_open_err(cm_node, skb, 0);
			/* drop pkt */
			break;
		}
		cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
		BUG_ON(cm_node->send_entry);
1632 1633 1634
		cm_node->accept_pend = 1;
		atomic_inc(&cm_node->listener->pend_accepts_cnt);

1635 1636 1637
		cm_node->state = NES_CM_STATE_SYN_RCVD;
		send_syn(cm_node, 1, skb);
		break;
1638 1639
	case NES_CM_STATE_CLOSED:
		cleanup_retrans_entry(cm_node);
1640
		add_ref_cm_node(cm_node);
1641 1642
		send_reset(cm_node, skb);
		break;
1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
	case NES_CM_STATE_TSA:
	case NES_CM_STATE_ESTABLISHED:
	case NES_CM_STATE_FIN_WAIT1:
	case NES_CM_STATE_FIN_WAIT2:
	case NES_CM_STATE_MPAREQ_RCVD:
	case NES_CM_STATE_LAST_ACK:
	case NES_CM_STATE_CLOSING:
	case NES_CM_STATE_UNKNOWN:
	default:
		drop_packet(skb);
		break;
	}
}

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

	int ret;
	u32 inc_sequence;
	int optionsize;

	optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1666
	skb_trim(skb, 0);
1667 1668 1669
	inc_sequence = ntohl(tcph->seq);
	switch (cm_node->state) {
	case NES_CM_STATE_SYN_SENT:
1670
		cleanup_retrans_entry(cm_node);
1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690
		/* active open */
		if (check_syn(cm_node, tcph, skb))
			return;
		cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
		/* setup options */
		ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
		if (ret) {
			nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
				cm_node);
			break;
		}
		cleanup_retrans_entry(cm_node);
		cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
		send_mpa_request(cm_node, skb);
		cm_node->state = NES_CM_STATE_MPAREQ_SENT;
		break;
	case NES_CM_STATE_MPAREQ_RCVD:
		/* passive open, so should not be here */
		passive_open_err(cm_node, skb, 1);
		break;
1691
	case NES_CM_STATE_LISTENING:
1692 1693 1694 1695 1696
		cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
		cleanup_retrans_entry(cm_node);
		cm_node->state = NES_CM_STATE_CLOSED;
		send_reset(cm_node, skb);
		break;
1697 1698 1699
	case NES_CM_STATE_CLOSED:
		cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
		cleanup_retrans_entry(cm_node);
1700
		add_ref_cm_node(cm_node);
1701 1702
		send_reset(cm_node, skb);
		break;
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715
	case NES_CM_STATE_ESTABLISHED:
	case NES_CM_STATE_FIN_WAIT1:
	case NES_CM_STATE_FIN_WAIT2:
	case NES_CM_STATE_LAST_ACK:
	case NES_CM_STATE_TSA:
	case NES_CM_STATE_CLOSING:
	case NES_CM_STATE_UNKNOWN:
	case NES_CM_STATE_MPAREQ_SENT:
	default:
		drop_packet(skb);
		break;
	}
}
1716

1717
static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1718 1719 1720 1721 1722 1723
	struct tcphdr *tcph)
{
	int datasize = 0;
	u32 inc_sequence;
	u32 rem_seq_ack;
	u32 rem_seq;
1724
	int ret = 0;
1725 1726 1727
	int optionsize;
	optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);

1728
	if (check_seq(cm_node, tcph, skb))
1729
		return -EINVAL;
1730 1731

	skb_pull(skb, tcph->doff << 2);
1732
	inc_sequence = ntohl(tcph->seq);
1733 1734 1735 1736 1737 1738
	rem_seq = ntohl(tcph->seq);
	rem_seq_ack =  ntohl(tcph->ack_seq);
	datasize = skb->len;
	switch (cm_node->state) {
	case NES_CM_STATE_SYN_RCVD:
		/* Passive OPEN */
1739
		cleanup_retrans_entry(cm_node);
1740 1741 1742
		ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
		if (ret)
			break;
1743 1744 1745 1746
		cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
		cm_node->state = NES_CM_STATE_ESTABLISHED;
		if (datasize) {
			cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1747
			handle_rcv_mpa(cm_node, skb);
1748
		} else  /* rcvd ACK only */
1749 1750 1751 1752
			dev_kfree_skb_any(skb);
		break;
	case NES_CM_STATE_ESTABLISHED:
		/* Passive OPEN */
1753
		cleanup_retrans_entry(cm_node);
1754 1755
		if (datasize) {
			cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1756
			handle_rcv_mpa(cm_node, skb);
1757 1758 1759 1760 1761 1762 1763
		} else
			drop_packet(skb);
		break;
	case NES_CM_STATE_MPAREQ_SENT:
		cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
		if (datasize) {
			cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1764
			handle_rcv_mpa(cm_node, skb);
1765
		} else  /* Could be just an ack pkt.. */
1766 1767
			dev_kfree_skb_any(skb);
		break;
1768
	case NES_CM_STATE_LISTENING:
1769 1770 1771 1772
		cleanup_retrans_entry(cm_node);
		cm_node->state = NES_CM_STATE_CLOSED;
		send_reset(cm_node, skb);
		break;
1773 1774
	case NES_CM_STATE_CLOSED:
		cleanup_retrans_entry(cm_node);
1775
		add_ref_cm_node(cm_node);
1776 1777
		send_reset(cm_node, skb);
		break;
1778
	case NES_CM_STATE_LAST_ACK:
1779
	case NES_CM_STATE_CLOSING:
1780 1781 1782 1783 1784 1785
		cleanup_retrans_entry(cm_node);
		cm_node->state = NES_CM_STATE_CLOSED;
		cm_node->cm_id->rem_ref(cm_node->cm_id);
		rem_ref_cm_node(cm_node->cm_core, cm_node);
		drop_packet(skb);
		break;
1786
	case NES_CM_STATE_FIN_WAIT1:
1787 1788 1789 1790
		cleanup_retrans_entry(cm_node);
		drop_packet(skb);
		cm_node->state = NES_CM_STATE_FIN_WAIT2;
		break;
1791 1792 1793 1794 1795 1796
	case NES_CM_STATE_SYN_SENT:
	case NES_CM_STATE_FIN_WAIT2:
	case NES_CM_STATE_TSA:
	case NES_CM_STATE_MPAREQ_RCVD:
	case NES_CM_STATE_UNKNOWN:
	default:
1797
		cleanup_retrans_entry(cm_node);
1798 1799
		drop_packet(skb);
		break;
1800
	}
1801
	return ret;
1802
}
1803 1804 1805



1806 1807 1808 1809
static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
	struct sk_buff *skb, int optionsize, int passive)
{
	u8 *optionsloc = (u8 *)&tcph[1];
1810
	if (optionsize) {
1811 1812 1813 1814 1815
		if (process_options(cm_node, optionsloc, optionsize,
			(u32)tcph->syn)) {
			nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
				__func__, cm_node);
			if (passive)
1816
				passive_open_err(cm_node, skb, 1);
1817
			else
1818
				active_open_err(cm_node, skb, 1);
1819
			return 1;
1820
		}
1821
	}
1822 1823 1824 1825

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

1826
	if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1827
		cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1828 1829
	return 0;
}
1830

1831 1832 1833 1834
/*
 * active_open_err() will send reset() if flag set..
 * It will also send ABORT event.
 */
1835

1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846
static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
	int reset)
{
	cleanup_retrans_entry(cm_node);
	if (reset) {
		nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
				"state=%d\n", cm_node, cm_node->state);
		add_ref_cm_node(cm_node);
		send_reset(cm_node, skb);
	} else
		dev_kfree_skb_any(skb);
1847

1848 1849 1850
	cm_node->state = NES_CM_STATE_CLOSED;
	create_event(cm_node, NES_CM_EVENT_ABORTED);
}
1851

1852 1853 1854 1855
/*
 * passive_open_err() will either do a reset() or will free up the skb and
 * remove the cm_node.
 */
1856

1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868
static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
	int reset)
{
	cleanup_retrans_entry(cm_node);
	cm_node->state = NES_CM_STATE_CLOSED;
	if (reset) {
		nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
			"cm_node=%p state =%d\n", cm_node, cm_node->state);
		send_reset(cm_node, skb);
	} else {
		dev_kfree_skb_any(skb);
		rem_ref_cm_node(cm_node->cm_core, cm_node);
1869
	}
1870
}
1871

1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884
/*
 * free_retrans_entry() routines assumes that the retrans_list_lock has
 * been acquired before calling.
 */
static void free_retrans_entry(struct nes_cm_node *cm_node)
{
	struct nes_timer_entry *send_entry;
	send_entry = cm_node->send_entry;
	if (send_entry) {
		cm_node->send_entry = NULL;
		dev_kfree_skb_any(send_entry->skb);
		kfree(send_entry);
		rem_ref_cm_node(cm_node->cm_core, cm_node);
1885
	}
1886
}
1887

1888 1889 1890
static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
{
	unsigned long flags;
1891

1892 1893 1894
	spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
	free_retrans_entry(cm_node);
	spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1895 1896
}

1897 1898 1899 1900 1901 1902 1903 1904 1905
/**
 * process_packet
 * Returns skb if to be freed, else it will return NULL if already used..
 */
static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
	struct nes_cm_core *cm_core)
{
	enum nes_tcpip_pkt_type	pkt_type = NES_PKT_TYPE_UNKNOWN;
	struct tcphdr *tcph = tcp_hdr(skb);
1906
	u32     fin_set = 0;
1907
	int ret = 0;
1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919
	skb_pull(skb, ip_hdr(skb)->ihl << 2);

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

	if (tcph->rst)
		pkt_type = NES_PKT_TYPE_RST;
	else if (tcph->syn) {
		pkt_type = NES_PKT_TYPE_SYN;
		if (tcph->ack)
			pkt_type = NES_PKT_TYPE_SYNACK;
1920
	} else if (tcph->ack)
1921
		pkt_type = NES_PKT_TYPE_ACK;
1922 1923
	if (tcph->fin)
		fin_set = 1;
1924 1925 1926 1927 1928 1929 1930 1931 1932

	switch (pkt_type) {
	case NES_PKT_TYPE_SYN:
		handle_syn_pkt(cm_node, skb, tcph);
		break;
	case NES_PKT_TYPE_SYNACK:
		handle_synack_pkt(cm_node, skb, tcph);
		break;
	case NES_PKT_TYPE_ACK:
1933 1934
		ret = handle_ack_pkt(cm_node, skb, tcph);
		if (fin_set && !ret)
1935
			handle_fin_pkt(cm_node);
1936 1937 1938 1939 1940
		break;
	case NES_PKT_TYPE_RST:
		handle_rst_pkt(cm_node, skb, tcph);
		break;
	default:
1941
		if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
1942
			handle_fin_pkt(cm_node);
1943
		drop_packet(skb);
1944 1945 1946
		break;
	}
}
1947 1948 1949 1950 1951

/**
 * mini_cm_listen - create a listen node with params
 */
static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1952
	struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
{
	struct nes_cm_listener *listener;
	unsigned long flags;

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

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

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

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

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

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

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

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

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

	return listener;
}


/**
 * mini_cm_connect - make a connection node with params
 */
2019
static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2020 2021
	struct nes_vnic *nesvnic, u16 private_data_len,
	void *private_data, struct nes_cm_info *cm_info)
2022 2023 2024 2025 2026 2027
{
	int ret = 0;
	struct nes_cm_node *cm_node;
	struct nes_cm_listener *loopbackremotelistener;
	struct nes_cm_node *loopbackremotenode;
	struct nes_cm_info loopback_cm_info;
2028 2029
	u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
	struct ietf_mpa_frame *mpa_frame = NULL;
2030 2031 2032 2033 2034

	/* create a CM connection node */
	cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
	if (!cm_node)
		return NULL;
2035
	mpa_frame = &cm_node->mpa_frame;
2036
	memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
2037 2038 2039
	mpa_frame->flags = IETF_MPA_FLAGS_CRC;
	mpa_frame->rev =  IETF_MPA_VERSION;
	mpa_frame->priv_data_len = htons(private_data_len);
2040

G
Glenn Streiff 已提交
2041
	/* set our node side to client (active) side */
2042 2043 2044 2045
	cm_node->tcp_cntxt.client = 1;
	cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;

	if (cm_info->loc_addr == cm_info->rem_addr) {
2046 2047 2048
		loopbackremotelistener = find_listener(cm_core,
				ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
				NES_CM_LISTENER_ACTIVE_STATE);
2049 2050 2051 2052 2053 2054 2055
		if (loopbackremotelistener == NULL) {
			create_event(cm_node, NES_CM_EVENT_ABORTED);
		} else {
			loopback_cm_info = *cm_info;
			loopback_cm_info.loc_port = cm_info->rem_port;
			loopback_cm_info.rem_port = cm_info->loc_port;
			loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2056 2057
			loopbackremotenode = make_cm_node(cm_core, nesvnic,
				&loopback_cm_info, loopbackremotelistener);
2058 2059 2060 2061 2062
			if (!loopbackremotenode) {
				rem_ref_cm_node(cm_node->cm_core, cm_node);
				return NULL;
			}
			atomic_inc(&cm_loopbacks);
2063
			loopbackremotenode->loopbackpartner = cm_node;
2064 2065
			loopbackremotenode->tcp_cntxt.rcv_wscale =
				NES_CM_DEFAULT_RCV_WND_SCALE;
2066
			cm_node->loopbackpartner = loopbackremotenode;
2067 2068 2069
			memcpy(loopbackremotenode->mpa_frame_buf, private_data,
				private_data_len);
			loopbackremotenode->mpa_frame_size = private_data_len;
2070

2071 2072
			/* we are done handling this state. */
			/* set node to a TSA state */
2073
			cm_node->state = NES_CM_STATE_TSA;
2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089
			cm_node->tcp_cntxt.rcv_nxt =
				loopbackremotenode->tcp_cntxt.loc_seq_num;
			loopbackremotenode->tcp_cntxt.rcv_nxt =
				cm_node->tcp_cntxt.loc_seq_num;
			cm_node->tcp_cntxt.max_snd_wnd =
				loopbackremotenode->tcp_cntxt.rcv_wnd;
			loopbackremotenode->tcp_cntxt.max_snd_wnd =
				cm_node->tcp_cntxt.rcv_wnd;
			cm_node->tcp_cntxt.snd_wnd =
				loopbackremotenode->tcp_cntxt.rcv_wnd;
			loopbackremotenode->tcp_cntxt.snd_wnd =
				cm_node->tcp_cntxt.rcv_wnd;
			cm_node->tcp_cntxt.snd_wscale =
				loopbackremotenode->tcp_cntxt.rcv_wscale;
			loopbackremotenode->tcp_cntxt.snd_wscale =
				cm_node->tcp_cntxt.rcv_wscale;
2090
			loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2091 2092 2093 2094 2095 2096 2097 2098
			create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
		}
		return cm_node;
	}

	/* set our node side to client (active) side */
	cm_node->tcp_cntxt.client = 1;
	/* init our MPA frame ptr */
2099 2100
	memcpy(mpa_frame->priv_data, private_data, private_data_len);

2101 2102 2103 2104
	cm_node->mpa_frame_size = mpa_frame_size;

	/* send a syn and goto syn sent state */
	cm_node->state = NES_CM_STATE_SYN_SENT;
2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115
	ret = send_syn(cm_node, 0, NULL);

	if (ret) {
		/* error in sending the syn free up the cm_node struct */
		nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
			"addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
			cm_node->rem_addr, cm_node->rem_port, cm_node,
			cm_node->cm_id);
		rem_ref_cm_node(cm_node->cm_core, cm_node);
		cm_node = NULL;
	}
2116

2117 2118 2119 2120 2121
	if (cm_node)
		nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
			"port=0x%04x, cm_node=%p, cm_id = %p.\n",
			cm_node->rem_addr, cm_node->rem_port, cm_node,
			cm_node->cm_id);
2122 2123 2124 2125 2126 2127 2128 2129 2130

	return cm_node;
}


/**
 * mini_cm_accept - accept a connection
 * This function is never called
 */
2131 2132
static int mini_cm_accept(struct nes_cm_core *cm_core,
	struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2133 2134 2135 2136 2137 2138 2139 2140
{
	return 0;
}


/**
 * mini_cm_reject - reject and teardown a connection
 */
2141
static int mini_cm_reject(struct nes_cm_core *cm_core,
2142
	struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2143 2144
{
	int ret = 0;
2145
	int err = 0;
2146
	int passive_state;
2147 2148 2149
	struct nes_cm_event event;
	struct iw_cm_id *cm_id = cm_node->cm_id;
	struct nes_cm_node *loopback = cm_node->loopbackpartner;
2150

2151 2152
	nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
		__func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2153

2154 2155 2156
	if (cm_node->tcp_cntxt.client)
		return ret;
	cleanup_retrans_entry(cm_node);
2157

2158 2159 2160 2161 2162 2163
	if (!loopback) {
		passive_state = atomic_add_return(1, &cm_node->passive_state);
		if (passive_state == NES_SEND_RESET_EVENT) {
			cm_node->state = NES_CM_STATE_CLOSED;
			rem_ref_cm_node(cm_core, cm_node);
		} else {
F
Faisal Latif 已提交
2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175
			if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
				rem_ref_cm_node(cm_core, cm_node);
			} else {
				ret = send_mpa_reject(cm_node);
				if (ret) {
					cm_node->state = NES_CM_STATE_CLOSED;
					err = send_reset(cm_node, NULL);
					if (err)
						WARN_ON(1);
				} else
					cm_id->add_ref(cm_id);
			}
2176 2177 2178
		}
	} else {
		cm_node->cm_id = NULL;
F
Faisal Latif 已提交
2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191
		if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
			rem_ref_cm_node(cm_core, cm_node);
			rem_ref_cm_node(cm_core, loopback);
		} else {
			event.cm_node = loopback;
			event.cm_info.rem_addr = loopback->rem_addr;
			event.cm_info.loc_addr = loopback->loc_addr;
			event.cm_info.rem_port = loopback->rem_port;
			event.cm_info.loc_port = loopback->loc_port;
			event.cm_info.cm_id = loopback->cm_id;
			cm_event_mpa_reject(&event);
			rem_ref_cm_node(cm_core, cm_node);
			loopback->state = NES_CM_STATE_CLOSING;
2192

F
Faisal Latif 已提交
2193 2194 2195 2196
			cm_id = loopback->cm_id;
			rem_ref_cm_node(cm_core, loopback);
			cm_id->rem_ref(cm_id);
		}
2197 2198
	}

2199 2200 2201 2202 2203 2204 2205
	return ret;
}


/**
 * mini_cm_close
 */
2206
static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2207 2208 2209 2210 2211 2212 2213
{
	int ret = 0;

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

	switch (cm_node->state) {
2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235
	case NES_CM_STATE_SYN_RCVD:
	case NES_CM_STATE_SYN_SENT:
	case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
	case NES_CM_STATE_ESTABLISHED:
	case NES_CM_STATE_ACCEPTING:
	case NES_CM_STATE_MPAREQ_SENT:
	case NES_CM_STATE_MPAREQ_RCVD:
		cleanup_retrans_entry(cm_node);
		send_reset(cm_node, NULL);
		break;
	case NES_CM_STATE_CLOSE_WAIT:
		cm_node->state = NES_CM_STATE_LAST_ACK;
		send_fin(cm_node, NULL);
		break;
	case NES_CM_STATE_FIN_WAIT1:
	case NES_CM_STATE_FIN_WAIT2:
	case NES_CM_STATE_LAST_ACK:
	case NES_CM_STATE_TIME_WAIT:
	case NES_CM_STATE_CLOSING:
		ret = -1;
		break;
	case NES_CM_STATE_LISTENING:
2236 2237 2238 2239
		cleanup_retrans_entry(cm_node);
		send_reset(cm_node, NULL);
		break;
	case NES_CM_STATE_MPAREJ_RCVD:
2240 2241 2242
	case NES_CM_STATE_UNKNOWN:
	case NES_CM_STATE_INITED:
	case NES_CM_STATE_CLOSED:
F
Faisal Latif 已提交
2243
	case NES_CM_STATE_LISTENER_DESTROYED:
2244 2245 2246 2247 2248 2249 2250 2251
		ret = rem_ref_cm_node(cm_core, cm_node);
		break;
	case NES_CM_STATE_TSA:
		if (cm_node->send_entry)
			printk(KERN_ERR "ERROR Close got called from STATE_TSA "
				"send_entry=%p\n", cm_node->send_entry);
		ret = rem_ref_cm_node(cm_core, cm_node);
		break;
2252 2253 2254 2255 2256 2257 2258 2259 2260
	}
	return ret;
}


/**
 * recv_pkt - recv an ETHERNET packet, and process it through CM
 * node state machine
 */
2261
static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2262
	struct nes_vnic *nesvnic, struct sk_buff *skb)
2263 2264 2265 2266 2267 2268
{
	struct nes_cm_node *cm_node = NULL;
	struct nes_cm_listener *listener = NULL;
	struct iphdr *iph;
	struct tcphdr *tcph;
	struct nes_cm_info nfo;
2269
	int skb_handled = 1;
2270
	__be32 tmp_daddr, tmp_saddr;
2271

2272
	if (!skb)
2273
		return 0;
2274
	if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2275
		return 0;
2276 2277 2278 2279 2280 2281 2282 2283 2284 2285
	}

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

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

2286 2287 2288
	tmp_daddr = cpu_to_be32(iph->daddr);
	tmp_saddr = cpu_to_be32(iph->saddr);

H
Harvey Harrison 已提交
2289
	nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2290
		  &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2291

2292 2293
	do {
		cm_node = find_node(cm_core,
2294 2295 2296 2297
			nfo.rem_port, nfo.rem_addr,
			nfo.loc_port, nfo.loc_addr);

		if (!cm_node) {
2298 2299 2300
			/* Only type of packet accepted are for */
			/* the PASSIVE open (syn only) */
			if ((!tcph->syn) || (tcph->ack)) {
2301
				skb_handled = 0;
2302 2303 2304 2305 2306
				break;
			}
			listener = find_listener(cm_core, nfo.loc_addr,
				nfo.loc_port,
				NES_CM_LISTENER_ACTIVE_STATE);
2307 2308 2309 2310 2311
			if (!listener) {
				nfo.cm_id = NULL;
				nfo.conn_type = 0;
				nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
				skb_handled = 0;
2312 2313
				break;
			}
2314 2315
			nfo.cm_id = listener->cm_id;
			nfo.conn_type = listener->conn_type;
2316 2317 2318 2319 2320 2321
			cm_node = make_cm_node(cm_core, nesvnic, &nfo,
				listener);
			if (!cm_node) {
				nes_debug(NES_DBG_CM, "Unable to allocate "
					"node\n");
				cm_packets_dropped++;
2322
				atomic_dec(&listener->ref_count);
2323 2324
				dev_kfree_skb_any(skb);
				break;
2325
			}
2326 2327 2328 2329 2330 2331 2332
			if (!tcph->rst && !tcph->fin) {
				cm_node->state = NES_CM_STATE_LISTENING;
			} else {
				cm_packets_dropped++;
				rem_ref_cm_node(cm_core, cm_node);
				dev_kfree_skb_any(skb);
				break;
2333
			}
2334 2335
			add_ref_cm_node(cm_node);
		} else if (cm_node->state == NES_CM_STATE_TSA) {
2336
			rem_ref_cm_node(cm_core, cm_node);
2337 2338 2339
			atomic_inc(&cm_accel_dropped_pkts);
			dev_kfree_skb_any(skb);
			break;
2340
		}
2341 2342 2343
		skb_reset_network_header(skb);
		skb_set_transport_header(skb, sizeof(*tcph));
		skb->len = ntohs(iph->tot_len);
2344 2345 2346
		process_packet(cm_node, skb, cm_core);
		rem_ref_cm_node(cm_core, cm_node);
	} while (0);
2347
	return skb_handled;
2348 2349 2350 2351 2352 2353
}


/**
 * nes_cm_alloc_core - allocate a top level instance of a cm core
 */
2354
static struct nes_cm_core *nes_cm_alloc_core(void)
2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396
{
	struct nes_cm_core *cm_core;

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

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

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

	atomic_set(&cm_core->events_posted, 0);

	cm_core->api = &nes_cm_api;

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

	INIT_LIST_HEAD(&cm_core->listen_list.list);

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

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

	print_core(cm_core);
	return cm_core;
}


/**
 * mini_cm_dealloc_core - deallocate a top level instance of a cm core
 */
2397
static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421
{
	nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);

	if (!cm_core)
		return -EINVAL;

	barrier();

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

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

	return 0;
}


/**
 * mini_cm_get
 */
2422
static int mini_cm_get(struct nes_cm_core *cm_core)
2423 2424 2425 2426 2427 2428 2429 2430
{
	return cm_core->state;
}


/**
 * mini_cm_set
 */
2431
static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2432 2433 2434 2435
{
	int ret = 0;

	switch (type) {
2436 2437 2438 2439 2440 2441 2442 2443 2444
	case NES_CM_SET_PKT_SIZE:
		cm_core->mtu = value;
		break;
	case NES_CM_SET_FREE_PKT_Q_SIZE:
		cm_core->free_tx_pkt_max = value;
		break;
	default:
		/* unknown set option */
		ret = -EINVAL;
2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524
	}

	return ret;
}


/**
 * nes_cm_init_tsa_conn setup HW; MPA frames must be
 * successfully exchanged when this is called
 */
static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
{
	int ret = 0;

	if (!nesqp)
		return -EINVAL;

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

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

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

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

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

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

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

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

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

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

	return ret;
}


/**
 * nes_cm_disconn
 */
int nes_cm_disconn(struct nes_qp *nesqp)
{
2525
	struct disconn_work *work;
2526

2527 2528 2529
	work = kzalloc(sizeof *work, GFP_ATOMIC);
	if (!work)
		return -ENOMEM; /* Timer will clean up */
2530

2531 2532 2533 2534
	nes_add_ref(&nesqp->ibqp);
	work->nesqp = nesqp;
	INIT_WORK(&work->work, nes_disconnect_worker);
	queue_work(g_cm_core->disconn_wq, &work->work);
2535 2536 2537 2538 2539 2540 2541
	return 0;
}


/**
 * nes_disconnect_worker
 */
2542
static void nes_disconnect_worker(struct work_struct *work)
2543
{
2544 2545
	struct disconn_work *dwork = container_of(work, struct disconn_work, work);
	struct nes_qp *nesqp = dwork->nesqp;
2546

2547
	kfree(dwork);
2548 2549 2550
	nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
			nesqp->last_aeq, nesqp->hwqp.qp_id);
	nes_cm_disconn_true(nesqp);
2551
	nes_rem_ref(&nesqp->ibqp);
2552 2553 2554 2555 2556 2557
}


/**
 * nes_cm_disconn_true
 */
2558
static int nes_cm_disconn_true(struct nes_qp *nesqp)
2559 2560 2561 2562 2563 2564 2565 2566 2567
{
	unsigned long flags;
	int ret = 0;
	struct iw_cm_id *cm_id;
	struct iw_cm_event cm_event;
	struct nes_vnic *nesvnic;
	u16 last_ae;
	u8 original_hw_tcp_state;
	u8 original_ibqp_state;
O
Or Gerlitz 已提交
2568
	enum iw_cm_event_status disconn_status = IW_CM_EVENT_STATUS_OK;
2569 2570 2571 2572 2573
	int issue_disconn = 0;
	int issue_close = 0;
	int issue_flush = 0;
	u32 flush_q = NES_CQP_FLUSH_RQ;
	struct ib_event ibevent;
2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596

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

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

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

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

2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623
	if (nesqp->term_flags) {
		issue_disconn = 1;
		issue_close = 1;
		nesqp->cm_id = NULL;
		if (nesqp->flush_issued == 0) {
			nesqp->flush_issued = 1;
			issue_flush = 1;
		}
	} else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
			((original_ibqp_state == IB_QPS_RTS) &&
			(last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
		issue_disconn = 1;
		if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
			disconn_status = IW_CM_EVENT_STATUS_RESET;
	}

	if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
		 (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
		 (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
		 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
		issue_close = 1;
		nesqp->cm_id = NULL;
		if (nesqp->flush_issued == 0) {
			nesqp->flush_issued = 1;
			issue_flush = 1;
		}
	}
2624

2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639
	spin_unlock_irqrestore(&nesqp->lock, flags);

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

		if (nesqp->term_flags) {
			ibevent.device = nesqp->ibqp.device;
			ibevent.event = nesqp->terminate_eventtype;
			ibevent.element.qp = &nesqp->ibqp;
			nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
		}
	}
2640

2641 2642
	if ((cm_id) && (cm_id->event_handler)) {
		if (issue_disconn) {
2643 2644
			atomic_inc(&cm_disconnects);
			cm_event.event = IW_CM_EVENT_DISCONNECT;
2645
			cm_event.status = disconn_status;
2646 2647 2648 2649 2650
			cm_event.local_addr = cm_id->local_addr;
			cm_event.remote_addr = cm_id->remote_addr;
			cm_event.private_data = NULL;
			cm_event.private_data_len = 0;

2651 2652 2653 2654 2655 2656
			nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
				" for  QP%u, SQ Head = %u, SQ Tail = %u. "
				"cm_id = %p, refcount = %u.\n",
				nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
				nesqp->hwqp.sq_tail, cm_id,
				atomic_read(&nesqp->refcount));
2657 2658 2659

			ret = cm_id->event_handler(cm_id, &cm_event);
			if (ret)
2660 2661
				nes_debug(NES_DBG_CM, "OFA CM event_handler "
					"returned, ret=%d\n", ret);
2662 2663
		}

2664
		if (issue_close) {
2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693
			atomic_inc(&cm_closes);
			nes_disconnect(nesqp, 1);

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

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

			cm_id->rem_ref(cm_id);
		}
	}

	return 0;
}


/**
 * nes_disconnect
 */
2694
static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2695 2696 2697 2698
{
	int ret = 0;
	struct nes_vnic *nesvnic;
	struct nes_device *nesdev;
2699
	struct nes_ib_device *nesibdev;
2700 2701 2702 2703 2704 2705

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

	nesdev = nesvnic->nesdev;
2706
	nesibdev = nesvnic->nesibdev;
2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717

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

	if (nesqp->active_conn) {

		/* indicate this connection is NOT active */
		nesqp->active_conn = 0;
	} else {
		/* Need to free the Last Streaming Mode Message */
		if (nesqp->ietf_frame) {
2718 2719
			if (nesqp->lsmm_mr)
				nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752
			pci_free_consistent(nesdev->pcidev,
					nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
					nesqp->ietf_frame, nesqp->ietf_frame_pbase);
		}
	}

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

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

	return ret;
}


/**
 * nes_accept
 */
int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
	u64 u64temp;
	struct ib_qp *ibqp;
	struct nes_qp *nesqp;
	struct nes_vnic *nesvnic;
	struct nes_device *nesdev;
	struct nes_cm_node *cm_node;
	struct nes_adapter *adapter;
	struct ib_qp_attr attr;
	struct iw_cm_event cm_event;
	struct nes_hw_qp_wqe *wqe;
	struct nes_v4_quad nes_quad;
2753
	u32 crc_value;
2754
	int ret;
2755
	int passive_state;
2756 2757 2758 2759
	struct nes_ib_device *nesibdev;
	struct ib_mr *ibmr = NULL;
	struct ib_phys_buf ibphysbuf;
	struct nes_pd *nespd;
2760
	u64 tagged_offset;
2761

2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772
	ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
	if (!ibqp)
		return -EINVAL;

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

	cm_node = (struct nes_cm_node *)cm_id->provider_data;
2773 2774 2775
	nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
		"%s\n", cm_node, nesvnic, nesvnic->netdev,
		nesvnic->netdev->name);
2776

F
Faisal Latif 已提交
2777 2778 2779 2780 2781 2782 2783
	if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
		if (cm_node->loopbackpartner)
			rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
		rem_ref_cm_node(cm_node->cm_core, cm_node);
		return -EINVAL;
	}

2784 2785
	/* associate the node with the QP */
	nesqp->cm_node = (void *)cm_node;
2786
	cm_node->nesqp = nesqp;
2787

2788 2789
	nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
		nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2790 2791 2792 2793 2794
	atomic_inc(&cm_accepts);

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

2795 2796 2797 2798
	/* allocate the ietf frame and space for private data */
	nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
		sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
		&nesqp->ietf_frame_pbase);
2799

2800 2801 2802 2803 2804
	if (!nesqp->ietf_frame) {
		nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
			"data\n");
		return -ENOMEM;
	}
2805 2806


2807 2808 2809
	/* setup the MPA frame */
	nesqp->private_data_len = conn_param->private_data_len;
	memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2810

2811 2812
	memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
			conn_param->private_data_len);
2813

2814 2815 2816 2817
	nesqp->ietf_frame->priv_data_len =
		cpu_to_be16(conn_param->private_data_len);
	nesqp->ietf_frame->rev = mpa_version;
	nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2818

2819 2820 2821 2822 2823 2824
	/* setup our first outgoing iWarp send WQE (the IETF frame response) */
	wqe = &nesqp->hwqp.sq_vbase[0];

	if (cm_id->remote_addr.sin_addr.s_addr !=
			cm_id->local_addr.sin_addr.s_addr) {
		u64temp = (unsigned long)nesqp;
2825 2826 2827 2828 2829
		nesibdev = nesvnic->nesibdev;
		nespd = nesqp->nespd;
		ibphysbuf.addr = nesqp->ietf_frame_pbase;
		ibphysbuf.size = conn_param->private_data_len +
					sizeof(struct ietf_mpa_frame);
2830
		tagged_offset = (u64)(unsigned long)nesqp->ietf_frame;
2831 2832 2833
		ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
						&ibphysbuf, 1,
						IB_ACCESS_LOCAL_WRITE,
2834
						&tagged_offset);
2835 2836 2837 2838
		if (!ibmr) {
			nes_debug(NES_DBG_CM, "Unable to register memory region"
					"for lSMM for cm_node = %p \n",
					cm_node);
2839 2840 2841
			pci_free_consistent(nesdev->pcidev,
				nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
				nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2842 2843 2844 2845 2846 2847 2848
			return -ENOMEM;
		}

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

2849 2850 2851 2852 2853 2854 2855 2856 2857 2858
		u64temp |= NES_SW_CONTEXT_ALIGN>>1;
		set_wqe_64bit_value(wqe->wqe_words,
			NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
			u64temp);
		wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
			cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
			NES_IWARP_SQ_WQE_WRPDU);
		wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
			cpu_to_le32(conn_param->private_data_len +
			sizeof(struct ietf_mpa_frame));
2859 2860
		set_wqe_64bit_value(wqe->wqe_words,
					NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
2861
					(u64)(unsigned long)nesqp->ietf_frame);
2862 2863 2864
		wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
			cpu_to_le32(conn_param->private_data_len +
			sizeof(struct ietf_mpa_frame));
2865
		wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
F
Faisal Latif 已提交
2866 2867 2868 2869
		if (nesqp->sq_kmapped) {
			nesqp->sq_kmapped = 0;
			kunmap(nesqp->page);
		}
2870 2871 2872 2873 2874 2875

		nesqp->nesqp_context->ird_ord_sizes |=
			cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
			NES_QPCONTEXT_ORDIRD_WRPDU);
	} else {
		nesqp->nesqp_context->ird_ord_sizes |=
2876
			cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
2877 2878
	}
	nesqp->skip_lsmm = 1;
2879 2880 2881 2882 2883 2884 2885 2886 2887 2888


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

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

2889 2890 2891 2892
	if (cm_node->state == NES_CM_STATE_TSA)
		nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
			cm_node);

2893 2894
	nes_cm_init_tsa_conn(nesqp, cm_node);

2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905
	nesqp->nesqp_context->tcpPorts[0] =
		cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
	nesqp->nesqp_context->tcpPorts[1] =
		cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));

	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
		nesqp->nesqp_context->ip0 =
			cpu_to_le32(ntohl(nesvnic->local_ipaddr));
	else
		nesqp->nesqp_context->ip0 =
			cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2906 2907

	nesqp->nesqp_context->misc2 |= cpu_to_le32(
2908 2909
			(u32)PCI_FUNC(nesdev->pcidev->devfn) <<
			NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2910

2911 2912 2913
	nesqp->nesqp_context->arp_index_vlan |=
		cpu_to_le32(nes_arp_table(nesdev,
			le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2914 2915 2916
			NES_ARP_RESOLVE) << 16);

	nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2917
		jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2918 2919 2920 2921

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

	nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2922 2923 2924
		((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
	nesqp->nesqp_context->ird_ord_sizes |=
		cpu_to_le32((u32)conn_param->ord);
2925 2926

	memset(&nes_quad, 0, sizeof(nes_quad));
2927 2928 2929 2930 2931 2932 2933 2934
	nes_quad.DstIpAdrIndex =
		cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
		nes_quad.SrcIpadr = nesvnic->local_ipaddr;
	else
		nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
	nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
	nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2935 2936

	/* Produce hash key */
2937 2938
	crc_value = get_crc_value(&nes_quad);
	nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2939
	nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2940
		nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2941 2942 2943 2944 2945 2946

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

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

2947 2948 2949
	nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
			"0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
			"private data length=%zu.\n", nesqp->hwqp.qp_id,
2950 2951 2952 2953 2954 2955
			ntohl(cm_id->remote_addr.sin_addr.s_addr),
			ntohs(cm_id->remote_addr.sin_port),
			ntohl(cm_id->local_addr.sin_addr.s_addr),
			ntohs(cm_id->local_addr.sin_port),
			le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
			le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2956 2957
			conn_param->private_data_len +
			sizeof(struct ietf_mpa_frame));
2958 2959


C
Coly Li 已提交
2960
	/* notify OF layer that accept event was successful */
2961
	cm_id->add_ref(cm_id);
2962
	nes_add_ref(&nesqp->ibqp);
2963 2964 2965 2966 2967 2968 2969 2970 2971

	cm_event.event = IW_CM_EVENT_ESTABLISHED;
	cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
	cm_event.provider_data = (void *)nesqp;
	cm_event.local_addr = cm_id->local_addr;
	cm_event.remote_addr = cm_id->remote_addr;
	cm_event.private_data = NULL;
	cm_event.private_data_len = 0;
	ret = cm_id->event_handler(cm_id, &cm_event);
2972 2973
	attr.qp_state = IB_QPS_RTS;
	nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2974
	if (cm_node->loopbackpartner) {
2975 2976
		cm_node->loopbackpartner->mpa_frame_size =
			nesqp->private_data_len;
2977
		/* copy entire MPA frame to our cm_node's frame */
2978 2979
		memcpy(cm_node->loopbackpartner->mpa_frame_buf,
			nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2980 2981 2982
		create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
	}
	if (ret)
2983 2984
		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
			"ret=%d\n", __func__, __LINE__, ret);
2985

2986 2987 2988
	passive_state = atomic_add_return(1, &cm_node->passive_state);
	if (passive_state == NES_SEND_RESET_EVENT)
		create_event(cm_node, NES_CM_EVENT_RESET);
2989 2990 2991 2992 2993 2994 2995 2996 2997 2998
	return 0;
}


/**
 * nes_reject
 */
int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
{
	struct nes_cm_node *cm_node;
2999 3000
	struct nes_cm_node *loopback;

3001 3002 3003 3004
	struct nes_cm_core *cm_core;

	atomic_inc(&cm_rejects);
	cm_node = (struct nes_cm_node *) cm_id->provider_data;
3005
	loopback = cm_node->loopbackpartner;
3006
	cm_core = cm_node->cm_core;
3007
	cm_node->cm_id = cm_id;
3008 3009
	cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;

3010 3011 3012
	if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
		return -EINVAL;

3013
	memcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
3014 3015 3016 3017 3018 3019 3020 3021 3022
	if (loopback) {
		memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
		loopback->mpa_frame.priv_data_len = pdata_len;
		loopback->mpa_frame_size = sizeof(struct ietf_mpa_frame) +
				pdata_len;
	} else {
		memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
		cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
	}
3023 3024 3025 3026

	cm_node->mpa_frame.rev = mpa_version;
	cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;

3027
	return cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042
}


/**
 * nes_connect
 * setup and launch cm connect node
 */
int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
	struct ib_qp *ibqp;
	struct nes_qp *nesqp;
	struct nes_vnic *nesvnic;
	struct nes_device *nesdev;
	struct nes_cm_node *cm_node;
	struct nes_cm_info cm_info;
3043
	int apbvt_set = 0;
3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057

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

F
Faisal Latif 已提交
3058 3059 3060
	if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
		return -EINVAL;

3061 3062 3063 3064 3065 3066 3067
	nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
		"0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
		ntohl(nesvnic->local_ipaddr),
		ntohl(cm_id->remote_addr.sin_addr.s_addr),
		ntohs(cm_id->remote_addr.sin_port),
		ntohl(cm_id->local_addr.sin_addr.s_addr),
		ntohs(cm_id->local_addr.sin_port));
3068

3069
	atomic_inc(&cm_connects);
3070 3071 3072 3073 3074 3075 3076 3077 3078 3079
	nesqp->active_conn = 1;

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

	cm_id->provider_data = nesqp;

	nesqp->private_data_len = conn_param->private_data_len;
	nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
	nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3080 3081
	nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
		conn_param->private_data_len);
3082

3083
	if (cm_id->local_addr.sin_addr.s_addr !=
3084
		cm_id->remote_addr.sin_addr.s_addr) {
3085
		nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3086
			PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3087 3088
		apbvt_set = 1;
	}
3089 3090

	/* set up the connection params for the node */
3091 3092 3093 3094
	cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
	cm_info.loc_port = htons(cm_id->local_addr.sin_port);
	cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
	cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3095 3096 3097 3098 3099 3100
	cm_info.cm_id = cm_id;
	cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;

	cm_id->add_ref(cm_id);

	/* create a connect CM node connection */
3101 3102 3103
	cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
		conn_param->private_data_len, (void *)conn_param->private_data,
		&cm_info);
3104
	if (!cm_node) {
3105
		if (apbvt_set)
3106
			nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3107 3108 3109
				PCI_FUNC(nesdev->pcidev->devfn),
				NES_MANAGE_APBVT_DEL);

3110 3111 3112 3113
		cm_id->rem_ref(cm_id);
		return -ENOMEM;
	}

3114
	cm_node->apbvt_set = apbvt_set;
3115
	nesqp->cm_node = cm_node;
3116
	cm_node->nesqp = nesqp;
3117
	nes_add_ref(&nesqp->ibqp);
3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158

	return 0;
}


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


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

	nesvnic = to_nesvnic(cm_id->device);
	if (!nesvnic)
		return -EINVAL;
	adapter = nesvnic->nesdev->nesadapter;
	nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
			nesvnic, nesvnic->netdev, nesvnic->netdev->name);

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

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

	cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;


	cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
	if (!cm_node) {
3159
		printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3160
				__func__, __LINE__);
3161 3162 3163 3164 3165 3166
		return -ENOMEM;
	}

	cm_id->provider_data = cm_node;

	if (!cm_node->reused_node) {
3167 3168 3169 3170
		err = nes_manage_apbvt(nesvnic,
			ntohs(cm_id->local_addr.sin_port),
			PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
			NES_MANAGE_APBVT_ADD);
3171
		if (err) {
3172 3173
			printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
				err);
3174 3175 3176
			g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
			return err;
		}
3177
		atomic_inc(&cm_listens_created);
3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208
	}

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


	return 0;
}


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

	cm_id->rem_ref(cm_id);

	return 0;
}


/**
 * nes_cm_recv
 */
int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
{
3209
	int rc = 0;
3210 3211
	cm_packets_received++;
	if ((g_cm_core) && (g_cm_core->api)) {
3212
		rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3213 3214 3215 3216 3217
	} else {
		nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
				" cm is not setup properly.\n");
	}

3218
	return rc;
3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253
}


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


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


/**
 * cm_event_connected
 * handle a connected event, setup QPs and HW
 */
3254
static void cm_event_connected(struct nes_cm_event *event)
3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266
{
	u64 u64temp;
	struct nes_qp *nesqp;
	struct nes_vnic *nesvnic;
	struct nes_device *nesdev;
	struct nes_cm_node *cm_node;
	struct nes_adapter *nesadapter;
	struct ib_qp_attr attr;
	struct iw_cm_id *cm_id;
	struct iw_cm_event cm_event;
	struct nes_hw_qp_wqe *wqe;
	struct nes_v4_quad nes_quad;
3267
	u32 crc_value;
3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293
	int ret;

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

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

	nes_cm_init_tsa_conn(nesqp, cm_node);

	/* set the QP tsa context */
3294 3295 3296 3297 3298 3299 3300 3301 3302 3303
	nesqp->nesqp_context->tcpPorts[0] =
		cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
	nesqp->nesqp_context->tcpPorts[1] =
		cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
		nesqp->nesqp_context->ip0 =
			cpu_to_le32(ntohl(nesvnic->local_ipaddr));
	else
		nesqp->nesqp_context->ip0 =
			cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3304 3305

	nesqp->nesqp_context->misc2 |= cpu_to_le32(
3306 3307
			(u32)PCI_FUNC(nesdev->pcidev->devfn) <<
			NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3308
	nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3309 3310
			nes_arp_table(nesdev,
			le32_to_cpu(nesqp->nesqp_context->ip0),
3311 3312 3313 3314 3315
			NULL, NES_ARP_RESOLVE) << 16);
	nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
			jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
	nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
	nesqp->nesqp_context->ird_ord_sizes |=
3316 3317
			cpu_to_le32((u32)1 <<
			NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3318 3319 3320 3321 3322

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

#if defined(NES_SEND_FIRST_WRITE)
3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337
	if (cm_node->send_write0) {
		nes_debug(NES_DBG_CM, "Sending first write.\n");
		wqe = &nesqp->hwqp.sq_vbase[0];
		u64temp = (unsigned long)nesqp;
		u64temp |= NES_SW_CONTEXT_ALIGN>>1;
		set_wqe_64bit_value(wqe->wqe_words,
				NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
		wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
			cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
		wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
		wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
		wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
		wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
		wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;

F
Faisal Latif 已提交
3338 3339 3340 3341 3342
		if (nesqp->sq_kmapped) {
			nesqp->sq_kmapped = 0;
			kunmap(nesqp->page);
		}

3343 3344 3345 3346 3347 3348 3349 3350 3351 3352
		/* use the reserved spot on the WQ for the extra first WQE */
		nesqp->nesqp_context->ird_ord_sizes &=
			cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
						NES_QPCONTEXT_ORDIRD_WRPDU |
						NES_QPCONTEXT_ORDIRD_ALSMM));
		nesqp->skip_lsmm = 1;
		nesqp->hwqp.sq_tail = 0;
		nes_write32(nesdev->regs + NES_WQE_ALLOC,
				(1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
	}
3353 3354 3355 3356
#endif

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

3357 3358 3359 3360 3361 3362
	nes_quad.DstIpAdrIndex =
		cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
	if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
		nes_quad.SrcIpadr = nesvnic->local_ipaddr;
	else
		nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3363 3364 3365 3366
	nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
	nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;

	/* Produce hash key */
3367 3368
	crc_value = get_crc_value(&nes_quad);
	nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386
	nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
			nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);

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

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

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

3387 3388
	cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
	cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3389 3390 3391 3392 3393 3394

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

	if (ret)
3395 3396 3397 3398
		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
			"ret=%d\n", __func__, __LINE__, ret);
	attr.qp_state = IB_QPS_RTS;
	nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3399

3400 3401
	nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
		"%lu\n", nesqp->hwqp.qp_id, jiffies);
3402 3403 3404 3405 3406 3407 3408 3409

	return;
}


/**
 * cm_event_connect_error
 */
3410
static void cm_event_connect_error(struct nes_cm_event *event)
3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437
{
	struct nes_qp *nesqp;
	struct iw_cm_id *cm_id;
	struct iw_cm_event cm_event;
	/* struct nes_cm_info cm_info; */
	int ret;

	if (!event->cm_node)
		return;

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

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

	if (!nesqp) {
		return;
	}

	/* notify OF layer about this connection error event */
	/* cm_id->rem_ref(cm_id); */
	nesqp->cm_id = NULL;
	cm_id->provider_data = NULL;
	cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
F
Faisal Latif 已提交
3438
	cm_event.status = -ECONNRESET;
3439 3440 3441 3442 3443 3444
	cm_event.provider_data = cm_id->provider_data;
	cm_event.local_addr = cm_id->local_addr;
	cm_event.remote_addr = cm_id->remote_addr;
	cm_event.private_data = NULL;
	cm_event.private_data_len = 0;

3445 3446 3447
	nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
		"remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
		cm_event.remote_addr.sin_addr.s_addr);
3448 3449 3450 3451

	ret = cm_id->event_handler(cm_id, &cm_event);
	nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
	if (ret)
3452 3453 3454
		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
			"ret=%d\n", __func__, __LINE__, ret);
	cm_id->rem_ref(cm_id);
3455

3456
	rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3457 3458 3459 3460 3461 3462 3463
	return;
}


/**
 * cm_event_reset
 */
3464
static void cm_event_reset(struct nes_cm_event *event)
3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481
{
	struct nes_qp *nesqp;
	struct iw_cm_id *cm_id;
	struct iw_cm_event cm_event;
	/* struct nes_cm_info cm_info; */
	int ret;

	if (!event->cm_node)
		return;

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

	cm_id = event->cm_node->cm_id;

	nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
	nesqp = cm_id->provider_data;
3482 3483
	if (!nesqp)
		return;
3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494

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

3495
	cm_id->add_ref(cm_id);
3496
	ret = cm_id->event_handler(cm_id, &cm_event);
3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507
	atomic_inc(&cm_closes);
	cm_event.event = IW_CM_EVENT_CLOSE;
	cm_event.status = IW_CM_EVENT_STATUS_OK;
	cm_event.provider_data = cm_id->provider_data;
	cm_event.local_addr = cm_id->local_addr;
	cm_event.remote_addr = cm_id->remote_addr;
	cm_event.private_data = NULL;
	cm_event.private_data_len = 0;
	nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
	ret = cm_id->event_handler(cm_id, &cm_event);

3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520
	nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);


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

	return;
}


/**
 * cm_event_mpa_req
 */
3521
static void cm_event_mpa_req(struct nes_cm_event *event)
3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544
{
	struct iw_cm_id   *cm_id;
	struct iw_cm_event cm_event;
	int ret;
	struct nes_cm_node *cm_node;

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

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

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

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

3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582
	cm_event.remote_addr.sin_family = AF_INET;
	cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
	cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
	cm_event.private_data = cm_node->mpa_frame_buf;
	cm_event.private_data_len  = (u8) cm_node->mpa_frame_size;

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


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

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

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

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

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

3583 3584 3585 3586
	cm_event.remote_addr.sin_family = AF_INET;
	cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
	cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);

3587 3588 3589 3590 3591 3592 3593
	cm_event.private_data = cm_node->mpa_frame_buf;
	cm_event.private_data_len = (u8) cm_node->mpa_frame_size;

	nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
			"remove_addr=%08x\n",
			cm_event.local_addr.sin_addr.s_addr,
			cm_event.remote_addr.sin_addr.s_addr);
3594 3595 3596

	ret = cm_id->event_handler(cm_id, &cm_event);
	if (ret)
3597
		printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3598
				__func__, __LINE__, ret);
3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609

	return;
}


static void nes_cm_event_handler(struct work_struct *);

/**
 * nes_cm_post_event
 * post an event to the cm event handler
 */
3610
static int nes_cm_post_event(struct nes_cm_event *event)
3611 3612 3613 3614 3615
{
	atomic_inc(&event->cm_node->cm_core->events_posted);
	add_ref_cm_node(event->cm_node);
	event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
	INIT_WORK(&event->event_work, nes_cm_event_handler);
3616 3617
	nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
		event->cm_node, event);
3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632

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

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


/**
 * nes_cm_event_handler
 * worker function to handle cm events
 * will free instance of nes_cm_event
 */
static void nes_cm_event_handler(struct work_struct *work)
{
3633 3634
	struct nes_cm_event *event = container_of(work, struct nes_cm_event,
			event_work);
3635 3636
	struct nes_cm_core *cm_core;

3637
	if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3638
		return;
3639

3640 3641
	cm_core = event->cm_node->cm_core;
	nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3642
		event, event->type, atomic_read(&cm_core->events_posted));
3643 3644

	switch (event->type) {
3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657
	case NES_CM_EVENT_MPA_REQ:
		cm_event_mpa_req(event);
		nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
			event->cm_node);
		break;
	case NES_CM_EVENT_RESET:
		nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
			event->cm_node);
		cm_event_reset(event);
		break;
	case NES_CM_EVENT_CONNECTED:
		if ((!event->cm_node->cm_id) ||
			(event->cm_node->state != NES_CM_STATE_TSA))
3658
			break;
3659 3660 3661
		cm_event_connected(event);
		nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
		break;
3662 3663 3664 3665 3666 3667 3668 3669
	case NES_CM_EVENT_MPA_REJECT:
		if ((!event->cm_node->cm_id) ||
				(event->cm_node->state == NES_CM_STATE_TSA))
			break;
		cm_event_mpa_reject(event);
		nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
		break;

3670 3671 3672
	case NES_CM_EVENT_ABORTED:
		if ((!event->cm_node->cm_id) ||
			(event->cm_node->state == NES_CM_STATE_TSA))
3673
			break;
3674 3675 3676 3677 3678 3679 3680 3681 3682
		cm_event_connect_error(event);
		nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
		break;
	case NES_CM_EVENT_DROPPED_PKT:
		nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
		break;
	default:
		nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
		break;
3683 3684 3685 3686 3687 3688 3689 3690 3691
	}

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

	return;
}