/*
* Copyright (c) 2006 - 2008 NetEffect, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#define TCPOPT_TIMESTAMP 8
#include <asm/atomic.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/init.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/notifier.h>
#include <linux/net.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/random.h>
#include <linux/list.h>
#include <linux/threads.h>
#include <net/neighbour.h>
#include <net/route.h>
#include <net/ip_fib.h>
#include "nes.h"
u32 cm_packets_sent;
u32 cm_packets_bounced;
u32 cm_packets_dropped;
u32 cm_packets_retrans;
u32 cm_packets_created;
u32 cm_packets_received;
u32 cm_listens_created;
u32 cm_listens_destroyed;
u32 cm_backlog_drops;
atomic_t cm_loopbacks;
atomic_t cm_nodes_created;
atomic_t cm_nodes_destroyed;
atomic_t cm_accel_dropped_pkts;
atomic_t cm_resets_recvd;
static inline int mini_cm_accelerated(struct nes_cm_core *, struct nes_cm_node *);
static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
struct nes_vnic *, struct nes_cm_info *);
static int add_ref_cm_node(struct nes_cm_node *);
static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
static struct sk_buff *form_cm_frame(struct sk_buff *, struct nes_cm_node *,
void *, u32, void *, u32, u8);
static struct sk_buff *get_free_pkt(struct nes_cm_node *cm_node);
static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
struct nes_vnic *,
struct ietf_mpa_frame *,
struct nes_cm_info *);
static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
struct nes_cm_node *);
static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
struct nes_cm_node *);
static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
struct sk_buff *);
static int mini_cm_dealloc_core(struct nes_cm_core *);
static int mini_cm_get(struct nes_cm_core *);
static int mini_cm_set(struct nes_cm_core *, u32, u32);
static int nes_cm_disconn_true(struct nes_qp *);
static int nes_cm_post_event(struct nes_cm_event *event);
static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
static void nes_disconnect_worker(struct work_struct *work);
static int send_ack(struct nes_cm_node *cm_node);
static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
/* External CM API Interface */
/* instance of function pointers for client API */
/* set address of this instance to cm_core->cm_ops at cm_core alloc */
static struct nes_cm_ops nes_cm_api = {
mini_cm_accelerated,
mini_cm_listen,
mini_cm_del_listen,
mini_cm_connect,
mini_cm_close,
mini_cm_accept,
mini_cm_reject,
mini_cm_recv_pkt,
mini_cm_dealloc_core,
mini_cm_get,
mini_cm_set
};
static struct nes_cm_core *g_cm_core;
atomic_t cm_connects;
atomic_t cm_accepts;
atomic_t cm_disconnects;
atomic_t cm_closes;
atomic_t cm_connecteds;
atomic_t cm_connect_reqs;
atomic_t cm_rejects;
/**
* create_event
*/
static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
enum nes_cm_event_type type)
{
struct nes_cm_event *event;
if (!cm_node->cm_id)
return NULL;
/* allocate an empty event */
event = kzalloc(sizeof(*event), GFP_ATOMIC);
if (!event)
return NULL;
event->type = type;
event->cm_node = cm_node;
event->cm_info.rem_addr = cm_node->rem_addr;
event->cm_info.loc_addr = cm_node->loc_addr;
event->cm_info.rem_port = cm_node->rem_port;
event->cm_info.loc_port = cm_node->loc_port;
event->cm_info.cm_id = cm_node->cm_id;
nes_debug(NES_DBG_CM, "Created event=%p, type=%u, dst_addr=%08x[%x],"
" src_addr=%08x[%x]\n",
event, type,
event->cm_info.loc_addr, event->cm_info.loc_port,
event->cm_info.rem_addr, event->cm_info.rem_port);
nes_cm_post_event(event);
return event;
}
/**
* send_mpa_request
*/
static int send_mpa_request(struct nes_cm_node *cm_node)
{
struct sk_buff *skb;
int ret;
skb = get_free_pkt(cm_node);
if (!skb) {
nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
return -1;
}
/* send an MPA Request frame */
form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
cm_node->mpa_frame_size, SET_ACK);
ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
if (ret < 0) {
return ret;
}
return 0;
}
/**
* recv_mpa - process a received TCP pkt, we are expecting an
* IETF MPA frame
*/
static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 len)
{
struct ietf_mpa_frame *mpa_frame;
/* assume req frame is in tcp data payload */
if (len < sizeof(struct ietf_mpa_frame)) {
nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
return -1;
}
mpa_frame = (struct ietf_mpa_frame *)buffer;
cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
" complete (%x + %x != %x)\n",
cm_node->mpa_frame_size, (u32)sizeof(struct ietf_mpa_frame), len);
return -1;
}
/* copy entire MPA frame to our cm_node's frame */
memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
cm_node->mpa_frame_size);
return 0;
}
/**
* handle_exception_pkt - process an exception packet.
* We have been in a TSA state, and we have now received SW
* TCP/IP traffic should be a FIN request or IP pkt with options
*/
static int handle_exception_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb)
{
int ret = 0;
struct tcphdr *tcph = tcp_hdr(skb);
/* first check to see if this a FIN pkt */
if (tcph->fin) {
/* we need to ACK the FIN request */
send_ack(cm_node);
/* check which side we are (client/server) and set next state accordingly */
if (cm_node->tcp_cntxt.client)
cm_node->state = NES_CM_STATE_CLOSING;
else {
/* we are the server side */
cm_node->state = NES_CM_STATE_CLOSE_WAIT;
/* since this is a self contained CM we don't wait for */
/* an APP to close us, just send final FIN immediately */
ret = send_fin(cm_node, NULL);
cm_node->state = NES_CM_STATE_LAST_ACK;
}
} else {
ret = -EINVAL;
}
return ret;
}
/**
* form_cm_frame - get a free packet and build empty frame Use
* node info to build.
*/
static struct sk_buff *form_cm_frame(struct sk_buff *skb, struct nes_cm_node *cm_node,
void *options, u32 optionsize, void *data,
u32 datasize, u8 flags)
{
struct tcphdr *tcph;
struct iphdr *iph;
struct ethhdr *ethh;
u8 *buf;
u16 packetsize = sizeof(*iph);
packetsize += sizeof(*tcph);
packetsize += optionsize + datasize;
memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
skb->len = 0;
buf = skb_put(skb, packetsize + ETH_HLEN);
ethh = (struct ethhdr *) buf;
buf += ETH_HLEN;
iph = (struct iphdr *)buf;
buf += sizeof(*iph);
tcph = (struct tcphdr *)buf;
skb_reset_mac_header(skb);
skb_set_network_header(skb, ETH_HLEN);
skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
buf += sizeof(*tcph);
skb->ip_summed = CHECKSUM_PARTIAL;
skb->protocol = htons(0x800);
skb->data_len = 0;
skb->mac_len = ETH_HLEN;
memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
ethh->h_proto = htons(0x0800);
iph->version = IPVERSION;
iph->ihl = 5; /* 5 * 4Byte words, IP headr len */
iph->tos = 0;
iph->tot_len = htons(packetsize);
iph->id = htons(++cm_node->tcp_cntxt.loc_id);
iph->frag_off = htons(0x4000);
iph->ttl = 0x40;
iph->protocol = 0x06; /* IPPROTO_TCP */
iph->saddr = htonl(cm_node->loc_addr);
iph->daddr = htonl(cm_node->rem_addr);
tcph->source = htons(cm_node->loc_port);
tcph->dest = htons(cm_node->rem_port);
tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
if (flags & SET_ACK) {
cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
tcph->ack = 1;
} else
tcph->ack_seq = 0;
if (flags & SET_SYN) {
cm_node->tcp_cntxt.loc_seq_num++;
tcph->syn = 1;
} else
cm_node->tcp_cntxt.loc_seq_num += datasize; /* data (no headers) */
if (flags & SET_FIN)
tcph->fin = 1;
if (flags & SET_RST)
tcph->rst = 1;
tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
tcph->urg_ptr = 0;
if (optionsize)
memcpy(buf, options, optionsize);
buf += optionsize;
if (datasize)
memcpy(buf, data, datasize);
skb_shinfo(skb)->nr_frags = 0;
cm_packets_created++;
return skb;
}
/**
* print_core - dump a cm core
*/
static void print_core(struct nes_cm_core *core)
{
nes_debug(NES_DBG_CM, "---------------------------------------------\n");
nes_debug(NES_DBG_CM, "CM Core -- (core = %p )\n", core);
if (!core)
return;
nes_debug(NES_DBG_CM, "---------------------------------------------\n");
nes_debug(NES_DBG_CM, "Session ID : %u \n", atomic_read(&core->session_id));
nes_debug(NES_DBG_CM, "State : %u \n", core->state);
nes_debug(NES_DBG_CM, "Tx Free cnt : %u \n", skb_queue_len(&core->tx_free_list));
nes_debug(NES_DBG_CM, "Listen Nodes : %u \n", atomic_read(&core->listen_node_cnt));
nes_debug(NES_DBG_CM, "Active Nodes : %u \n", atomic_read(&core->node_cnt));
nes_debug(NES_DBG_CM, "core : %p \n", core);
nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
}
/**
* schedule_nes_timer
* note - cm_node needs to be protected before calling this. Encase in:
* rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
*/
int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
enum nes_timer_type type, int send_retrans,
int close_when_complete)
{
unsigned long flags;
struct nes_cm_core *cm_core;
struct nes_timer_entry *new_send;
int ret = 0;
u32 was_timer_set;
if (!cm_node)
return -EINVAL;
new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
if (!new_send)
return -1;
/* new_send->timetosend = currenttime */
new_send->retrycount = NES_DEFAULT_RETRYS;
new_send->retranscount = NES_DEFAULT_RETRANS;
new_send->skb = skb;
new_send->timetosend = jiffies;
new_send->type = type;
new_send->netdev = cm_node->netdev;
new_send->send_retrans = send_retrans;
new_send->close_when_complete = close_when_complete;
if (type == NES_TIMER_TYPE_CLOSE) {
new_send->timetosend += (HZ/2); /* TODO: decide on the correct value here */
spin_lock_irqsave(&cm_node->recv_list_lock, flags);
list_add_tail(&new_send->list, &cm_node->recv_list);
spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
}
if (type == NES_TIMER_TYPE_SEND) {
new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
atomic_inc(&new_send->skb->users);
ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
if (ret != NETDEV_TX_OK) {
nes_debug(NES_DBG_CM, "Error sending packet %p (jiffies = %lu)\n",
new_send, jiffies);
atomic_dec(&new_send->skb->users);
new_send->timetosend = jiffies;
} else {
cm_packets_sent++;
if (!send_retrans) {
if (close_when_complete)
rem_ref_cm_node(cm_node->cm_core, cm_node);
dev_kfree_skb_any(new_send->skb);
kfree(new_send);
return ret;
}
new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
}
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
list_add_tail(&new_send->list, &cm_node->retrans_list);
spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
}
if (type == NES_TIMER_TYPE_RECV) {
new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
new_send->timetosend = jiffies;
spin_lock_irqsave(&cm_node->recv_list_lock, flags);
list_add_tail(&new_send->list, &cm_node->recv_list);
spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
}
cm_core = cm_node->cm_core;
was_timer_set = timer_pending(&cm_core->tcp_timer);
if (!was_timer_set) {
cm_core->tcp_timer.expires = new_send->timetosend;
add_timer(&cm_core->tcp_timer);
}
return ret;
}
/**
* nes_cm_timer_tick
*/
static void nes_cm_timer_tick(unsigned long pass)
{
unsigned long flags, qplockflags;
unsigned long nexttimeout = jiffies + NES_LONG_TIME;
struct iw_cm_id *cm_id;
struct nes_cm_node *cm_node;
struct nes_timer_entry *send_entry, *recv_entry;
struct list_head *list_core, *list_core_temp;
struct list_head *list_node, *list_node_temp;
struct nes_cm_core *cm_core = g_cm_core;
struct nes_qp *nesqp;
struct sk_buff *skb;
u32 settimer = 0;
int ret = NETDEV_TX_OK;
int node_done;
spin_lock_irqsave(&cm_core->ht_lock, flags);
list_for_each_safe(list_node, list_core_temp, &cm_core->connected_nodes) {
cm_node = container_of(list_node, struct nes_cm_node, list);
add_ref_cm_node(cm_node);
spin_unlock_irqrestore(&cm_core->ht_lock, flags);
spin_lock_irqsave(&cm_node->recv_list_lock, flags);
list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
recv_entry = container_of(list_core, struct nes_timer_entry, list);
if ((time_after(recv_entry->timetosend, jiffies)) &&
(recv_entry->type == NES_TIMER_TYPE_CLOSE)) {
if (nexttimeout > recv_entry->timetosend || !settimer) {
nexttimeout = recv_entry->timetosend;
settimer = 1;
}
continue;
}
list_del(&recv_entry->list);
cm_id = cm_node->cm_id;
spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
if (recv_entry->type == NES_TIMER_TYPE_CLOSE) {
nesqp = (struct nes_qp *)recv_entry->skb;
spin_lock_irqsave(&nesqp->lock, qplockflags);
if (nesqp->cm_id) {
nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, refcount = %d: "
"****** HIT A NES_TIMER_TYPE_CLOSE"
" with something to do!!! ******\n",
nesqp->hwqp.qp_id, cm_id,
atomic_read(&nesqp->refcount));
nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
nesqp->ibqp_state = IB_QPS_ERR;
spin_unlock_irqrestore(&nesqp->lock, qplockflags);
nes_cm_disconn(nesqp);
} else {
spin_unlock_irqrestore(&nesqp->lock, qplockflags);
nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, refcount = %d:"
" ****** HIT A NES_TIMER_TYPE_CLOSE"
" with nothing to do!!! ******\n",
nesqp->hwqp.qp_id, cm_id,
atomic_read(&nesqp->refcount));
nes_rem_ref(&nesqp->ibqp);
}
if (cm_id)
cm_id->rem_ref(cm_id);
}
kfree(recv_entry);
spin_lock_irqsave(&cm_node->recv_list_lock, flags);
}
spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
node_done = 0;
list_for_each_safe(list_core, list_node_temp, &cm_node->retrans_list) {
if (node_done) {
break;
}
send_entry = container_of(list_core, struct nes_timer_entry, list);
if (time_after(send_entry->timetosend, jiffies)) {
if (cm_node->state != NES_CM_STATE_TSA) {
if ((nexttimeout > send_entry->timetosend) || !settimer) {
nexttimeout = send_entry->timetosend;
settimer = 1;
}
node_done = 1;
continue;
} else {
list_del(&send_entry->list);
skb = send_entry->skb;
spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
dev_kfree_skb_any(skb);
kfree(send_entry);
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
continue;
}
}
if (send_entry->type == NES_TIMER_NODE_CLEANUP) {
list_del(&send_entry->list);
spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
kfree(send_entry);
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
continue;
}
if ((send_entry->seq_num < cm_node->tcp_cntxt.rem_ack_num) ||
(cm_node->state == NES_CM_STATE_TSA) ||
(cm_node->state == NES_CM_STATE_CLOSED)) {
skb = send_entry->skb;
list_del(&send_entry->list);
spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
kfree(send_entry);
dev_kfree_skb_any(skb);
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
continue;
}
if (!send_entry->retranscount || !send_entry->retrycount) {
cm_packets_dropped++;
skb = send_entry->skb;
list_del(&send_entry->list);
spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
dev_kfree_skb_any(skb);
kfree(send_entry);
if (cm_node->state == NES_CM_STATE_SYN_RCVD) {
/* this node never even generated an indication up to the cm */
rem_ref_cm_node(cm_core, cm_node);
} else {
cm_node->state = NES_CM_STATE_CLOSED;
create_event(cm_node, NES_CM_EVENT_ABORTED);
}
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
continue;
}
/* this seems like the correct place, but leave send entry unprotected */
// spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
atomic_inc(&send_entry->skb->users);
cm_packets_retrans++;
nes_debug(NES_DBG_CM, "Retransmitting send_entry %p for node %p,"
" jiffies = %lu, time to send = %lu, retranscount = %u, "
"send_entry->seq_num = 0x%08X, cm_node->tcp_cntxt.rem_ack_num = 0x%08X\n",
send_entry, cm_node, jiffies, send_entry->timetosend, send_entry->retranscount,
send_entry->seq_num, cm_node->tcp_cntxt.rem_ack_num);
spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
if (ret != NETDEV_TX_OK) {
cm_packets_bounced++;
atomic_dec(&send_entry->skb->users);
send_entry->retrycount--;
nexttimeout = jiffies + NES_SHORT_TIME;
settimer = 1;
node_done = 1;
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
continue;
} else {
cm_packets_sent++;
}
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
list_del(&send_entry->list);
nes_debug(NES_DBG_CM, "Packet Sent: retrans count = %u, retry count = %u.\n",
send_entry->retranscount, send_entry->retrycount);
if (send_entry->send_retrans) {
send_entry->retranscount--;
send_entry->timetosend = jiffies + NES_RETRY_TIMEOUT;
if (nexttimeout > send_entry->timetosend || !settimer) {
nexttimeout = send_entry->timetosend;
settimer = 1;
}
list_add(&send_entry->list, &cm_node->retrans_list);
continue;
} else {
int close_when_complete;
skb = send_entry->skb;
close_when_complete = send_entry->close_when_complete;
spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
if (close_when_complete) {
BUG_ON(atomic_read(&cm_node->ref_count) == 1);
rem_ref_cm_node(cm_core, cm_node);
}
dev_kfree_skb_any(skb);
kfree(send_entry);
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
continue;
}
}
spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
rem_ref_cm_node(cm_core, cm_node);
spin_lock_irqsave(&cm_core->ht_lock, flags);
if (ret != NETDEV_TX_OK)
break;
}
spin_unlock_irqrestore(&cm_core->ht_lock, flags);
if (settimer) {
if (!timer_pending(&cm_core->tcp_timer)) {
cm_core->tcp_timer.expires = nexttimeout;
add_timer(&cm_core->tcp_timer);
}
}
}
/**
* send_syn
*/
static int send_syn(struct nes_cm_node *cm_node, u32 sendack)
{
int ret;
int flags = SET_SYN;
struct sk_buff *skb;
char optionsbuffer[sizeof(struct option_mss) +
sizeof(struct option_windowscale) +
sizeof(struct option_base) + 1];
int optionssize = 0;
/* Sending MSS option */
union all_known_options *options;
if (!cm_node)
return -EINVAL;
options = (union all_known_options *)&optionsbuffer[optionssize];
options->as_mss.optionnum = OPTION_NUMBER_MSS;
options->as_mss.length = sizeof(struct option_mss);
options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
optionssize += sizeof(struct option_mss);
options = (union all_known_options *)&optionsbuffer[optionssize];
options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
options->as_windowscale.length = sizeof(struct option_windowscale);
options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
optionssize += sizeof(struct option_windowscale);
if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)
) {
options = (union all_known_options *)&optionsbuffer[optionssize];
options->as_base.optionnum = OPTION_NUMBER_WRITE0;
options->as_base.length = sizeof(struct option_base);
optionssize += sizeof(struct option_base);
/* we need the size to be a multiple of 4 */
options = (union all_known_options *)&optionsbuffer[optionssize];
options->as_end = 1;
optionssize += 1;
options = (union all_known_options *)&optionsbuffer[optionssize];
options->as_end = 1;
optionssize += 1;
}
options = (union all_known_options *)&optionsbuffer[optionssize];
options->as_end = OPTION_NUMBER_END;
optionssize += 1;
skb = get_free_pkt(cm_node);
if (!skb) {
nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
return -1;
}
if (sendack)
flags |= SET_ACK;
form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
return ret;
}
/**
* send_reset
*/
static int send_reset(struct nes_cm_node *cm_node)
{
int ret;
struct sk_buff *skb = get_free_pkt(cm_node);
int flags = SET_RST | SET_ACK;
if (!skb) {
nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
return -1;
}
add_ref_cm_node(cm_node);
form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
return ret;
}
/**
* send_ack
*/
static int send_ack(struct nes_cm_node *cm_node)
{
int ret;
struct sk_buff *skb = get_free_pkt(cm_node);
if (!skb) {
nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
return -1;
}
form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
return ret;
}
/**
* send_fin
*/
static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
{
int ret;
/* if we didn't get a frame get one */
if (!skb)
skb = get_free_pkt(cm_node);
if (!skb) {
nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
return -1;
}
form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
return ret;
}
/**
* get_free_pkt
*/
static struct sk_buff *get_free_pkt(struct nes_cm_node *cm_node)
{
struct sk_buff *skb, *new_skb;
/* check to see if we need to repopulate the free tx pkt queue */
if (skb_queue_len(&cm_node->cm_core->tx_free_list) < NES_CM_FREE_PKT_LO_WATERMARK) {
while (skb_queue_len(&cm_node->cm_core->tx_free_list) <
cm_node->cm_core->free_tx_pkt_max) {
/* replace the frame we took, we won't get it back */
new_skb = dev_alloc_skb(cm_node->cm_core->mtu);
BUG_ON(!new_skb);
/* add a replacement frame to the free tx list head */
skb_queue_head(&cm_node->cm_core->tx_free_list, new_skb);
}
}
skb = skb_dequeue(&cm_node->cm_core->tx_free_list);
return skb;
}
/**
* make_hashkey - generate hash key from node tuple
*/
static inline int make_hashkey(u16 loc_port, nes_addr_t loc_addr, u16 rem_port,
nes_addr_t rem_addr)
{
u32 hashkey = 0;
hashkey = loc_addr + rem_addr + loc_port + rem_port;
hashkey = (hashkey % NES_CM_HASHTABLE_SIZE);
return hashkey;
}
/**
* find_node - find a cm node that matches the reference cm node
*/
static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
{
unsigned long flags;
u32 hashkey;
struct list_head *list_pos;
struct list_head *hte;
struct nes_cm_node *cm_node;
/* make a hash index key for this packet */
hashkey = make_hashkey(loc_port, loc_addr, rem_port, rem_addr);
/* get a handle on the hte */
hte = &cm_core->connected_nodes;
nes_debug(NES_DBG_CM, "Searching for an owner node:%x:%x from core %p->%p\n",
loc_addr, loc_port, cm_core, hte);
/* walk list and find cm_node associated with this session ID */
spin_lock_irqsave(&cm_core->ht_lock, flags);
list_for_each(list_pos, hte) {
cm_node = container_of(list_pos, struct nes_cm_node, list);
/* compare quad, return node handle if a match */
nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
cm_node->loc_addr, cm_node->loc_port,
loc_addr, loc_port,
cm_node->rem_addr, cm_node->rem_port,
rem_addr, rem_port);
if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
(cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
add_ref_cm_node(cm_node);
spin_unlock_irqrestore(&cm_core->ht_lock, flags);
return cm_node;
}
}
spin_unlock_irqrestore(&cm_core->ht_lock, flags);
/* no owner node */
return NULL;
}
/**
* find_listener - find a cm node listening on this addr-port pair
*/
static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
{
unsigned long flags;
struct list_head *listen_list;
struct nes_cm_listener *listen_node;
/* walk list and find cm_node associated with this session ID */
spin_lock_irqsave(&cm_core->listen_list_lock, flags);
list_for_each(listen_list, &cm_core->listen_list.list) {
listen_node = container_of(listen_list, struct nes_cm_listener, list);
/* compare node pair, return node handle if a match */
if (((listen_node->loc_addr == dst_addr) ||
listen_node->loc_addr == 0x00000000) &&
(listen_node->loc_port == dst_port) &&
(listener_state & listen_node->listener_state)) {
atomic_inc(&listen_node->ref_count);
spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
return listen_node;
}
}
spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
nes_debug(NES_DBG_CM, "Unable to find listener- %x:%x\n",
dst_addr, dst_port);
/* no listener */
return NULL;
}
/**
* add_hte_node - add a cm node to the hash table
*/
static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
{
unsigned long flags;
u32 hashkey;
struct list_head *hte;
if (!cm_node || !cm_core)
return -EINVAL;
nes_debug(NES_DBG_CM, "Adding Node to Active Connection HT\n");
/* first, make an index into our hash table */
hashkey = make_hashkey(cm_node->loc_port, cm_node->loc_addr,
cm_node->rem_port, cm_node->rem_addr);
cm_node->hashkey = hashkey;
spin_lock_irqsave(&cm_core->ht_lock, flags);
/* get a handle on the hash table element (list head for this slot) */
hte = &cm_core->connected_nodes;
list_add_tail(&cm_node->list, hte);
atomic_inc(&cm_core->ht_node_cnt);
spin_unlock_irqrestore(&cm_core->ht_lock, flags);
return 0;
}
/**
* mini_cm_dec_refcnt_listen
*/
static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
struct nes_cm_listener *listener, int free_hanging_nodes)
{
int ret = 1;
unsigned long flags;
spin_lock_irqsave(&cm_core->listen_list_lock, flags);
if (!atomic_dec_return(&listener->ref_count)) {
list_del(&listener->list);
/* decrement our listen node count */
atomic_dec(&cm_core->listen_node_cnt);
spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
if (listener->nesvnic) {
nes_manage_apbvt(listener->nesvnic, listener->loc_port,
PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
}
nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
kfree(listener);
listener = NULL;
ret = 0;
cm_listens_destroyed++;
} else {
spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
}
if (listener) {
if (atomic_read(&listener->pend_accepts_cnt) > 0)
nes_debug(NES_DBG_CM, "destroying listener (%p)"
" with non-zero pending accepts=%u\n",
listener, atomic_read(&listener->pend_accepts_cnt));
}
return ret;
}
/**
* mini_cm_del_listen
*/
static int mini_cm_del_listen(struct nes_cm_core *cm_core,
struct nes_cm_listener *listener)
{
listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
listener->cm_id = NULL; /* going to be destroyed pretty soon */
return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
}
/**
* mini_cm_accelerated
*/
static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
struct nes_cm_node *cm_node)
{
u32 was_timer_set;
cm_node->accelerated = 1;
if (cm_node->accept_pend) {
BUG_ON(!cm_node->listener);
atomic_dec(&cm_node->listener->pend_accepts_cnt);
BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
}
was_timer_set = timer_pending(&cm_core->tcp_timer);
if (!was_timer_set) {
cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
add_timer(&cm_core->tcp_timer);
}
return 0;
}
/**
* nes_addr_send_arp
*/
static void nes_addr_send_arp(u32 dst_ip)
{
struct rtable *rt;
struct flowi fl;
memset(&fl, 0, sizeof fl);
fl.nl_u.ip4_u.daddr = htonl(dst_ip);
if (ip_route_output_key(&init_net, &rt, &fl)) {
printk("%s: ip_route_output_key failed for 0x%08X\n",
__FUNCTION__, dst_ip);
return;
}
neigh_event_send(rt->u.dst.neighbour, NULL);
ip_rt_put(rt);
}
/**
* make_cm_node - create a new instance of a cm node
*/
static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
struct nes_cm_listener *listener)
{
struct nes_cm_node *cm_node;
struct timespec ts;
int arpindex = 0;
struct nes_device *nesdev;
struct nes_adapter *nesadapter;
/* create an hte and cm_node for this instance */
cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
if (!cm_node)
return NULL;
/* set our node specific transport info */
cm_node->loc_addr = cm_info->loc_addr;
cm_node->rem_addr = cm_info->rem_addr;
cm_node->loc_port = cm_info->loc_port;
cm_node->rem_port = cm_info->rem_port;
cm_node->send_write0 = send_first;
nes_debug(NES_DBG_CM, "Make node addresses : loc = %x:%x, rem = %x:%x\n",
cm_node->loc_addr, cm_node->loc_port, cm_node->rem_addr, cm_node->rem_port);
cm_node->listener = listener;
cm_node->netdev = nesvnic->netdev;
cm_node->cm_id = cm_info->cm_id;
memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n",
cm_node->listener, cm_node->cm_id);
INIT_LIST_HEAD(&cm_node->retrans_list);
spin_lock_init(&cm_node->retrans_list_lock);
INIT_LIST_HEAD(&cm_node->recv_list);
spin_lock_init(&cm_node->recv_list_lock);
cm_node->loopbackpartner = NULL;
atomic_set(&cm_node->ref_count, 1);
/* associate our parent CM core */
cm_node->cm_core = cm_core;
cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
NES_CM_DEFAULT_RCV_WND_SCALE;
ts = current_kernel_time();
cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
cm_node->tcp_cntxt.rcv_nxt = 0;
/* get a unique session ID , add thread_id to an upcounter to handle race */
atomic_inc(&cm_core->node_cnt);
atomic_inc(&cm_core->session_id);
cm_node->session_id = (u32)(atomic_read(&cm_core->session_id) + current->tgid);
cm_node->conn_type = cm_info->conn_type;
cm_node->apbvt_set = 0;
cm_node->accept_pend = 0;
cm_node->nesvnic = nesvnic;
/* get some device handles, for arp lookup */
nesdev = nesvnic->nesdev;
nesadapter = nesdev->nesadapter;
cm_node->loopbackpartner = NULL;
/* get the mac addr for the remote node */
arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
if (arpindex < 0) {
kfree(cm_node);
nes_addr_send_arp(cm_info->rem_addr);
return NULL;
}
/* copy the mac addr to node context */
memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
nes_debug(NES_DBG_CM, "Remote mac addr from arp table:%02x,"
" %02x, %02x, %02x, %02x, %02x\n",
cm_node->rem_mac[0], cm_node->rem_mac[1],
cm_node->rem_mac[2], cm_node->rem_mac[3],
cm_node->rem_mac[4], cm_node->rem_mac[5]);
add_hte_node(cm_core, cm_node);
atomic_inc(&cm_nodes_created);
return cm_node;
}
/**
* add_ref_cm_node - destroy an instance of a cm node
*/
static int add_ref_cm_node(struct nes_cm_node *cm_node)
{
atomic_inc(&cm_node->ref_count);
return 0;
}
/**
* rem_ref_cm_node - destroy an instance of a cm node
*/
static int rem_ref_cm_node(struct nes_cm_core *cm_core,
struct nes_cm_node *cm_node)
{
unsigned long flags, qplockflags;
struct nes_timer_entry *send_entry;
struct nes_timer_entry *recv_entry;
struct iw_cm_id *cm_id;
struct list_head *list_core, *list_node_temp;
struct nes_qp *nesqp;
if (!cm_node)
return -EINVAL;
spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
if (atomic_dec_return(&cm_node->ref_count)) {
spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
return 0;
}
list_del(&cm_node->list);
atomic_dec(&cm_core->ht_node_cnt);
spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
/* if the node is destroyed before connection was accelerated */
if (!cm_node->accelerated && cm_node->accept_pend) {
BUG_ON(!cm_node->listener);
atomic_dec(&cm_node->listener->pend_accepts_cnt);
BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
}
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
list_for_each_safe(list_core, list_node_temp, &cm_node->retrans_list) {
send_entry = container_of(list_core, struct nes_timer_entry, list);
list_del(&send_entry->list);
spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
dev_kfree_skb_any(send_entry->skb);
kfree(send_entry);
spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
continue;
}
spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
spin_lock_irqsave(&cm_node->recv_list_lock, flags);
list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
recv_entry = container_of(list_core, struct nes_timer_entry, list);
list_del(&recv_entry->list);
cm_id = cm_node->cm_id;
spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
if (recv_entry->type == NES_TIMER_TYPE_CLOSE) {
nesqp = (struct nes_qp *)recv_entry->skb;
spin_lock_irqsave(&nesqp->lock, qplockflags);
if (nesqp->cm_id) {
nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: ****** HIT A NES_TIMER_TYPE_CLOSE"
" with something to do!!! ******\n",
nesqp->hwqp.qp_id, cm_id);
nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
nesqp->ibqp_state = IB_QPS_ERR;
spin_unlock_irqrestore(&nesqp->lock, qplockflags);
nes_cm_disconn(nesqp);
} else {
spin_unlock_irqrestore(&nesqp->lock, qplockflags);
nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: ****** HIT A NES_TIMER_TYPE_CLOSE"
" with nothing to do!!! ******\n",
nesqp->hwqp.qp_id, cm_id);
nes_rem_ref(&nesqp->ibqp);
}
cm_id->rem_ref(cm_id);
} else if (recv_entry->type == NES_TIMER_TYPE_RECV) {
dev_kfree_skb_any(recv_entry->skb);
}
kfree(recv_entry);
spin_lock_irqsave(&cm_node->recv_list_lock, flags);
}
spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
if (cm_node->listener) {
mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
} else {
if (cm_node->apbvt_set && cm_node->nesvnic) {
nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
PCI_FUNC(cm_node->nesvnic->nesdev->pcidev->devfn),
NES_MANAGE_APBVT_DEL);
}
}
kfree(cm_node);
atomic_dec(&cm_core->node_cnt);
atomic_inc(&cm_nodes_destroyed);
return 0;
}
/**
* process_options
*/
static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc, u32 optionsize, u32 syn_packet)
{
u32 tmp;
u32 offset = 0;
union all_known_options *all_options;
char got_mss_option = 0;
while (offset < optionsize) {
all_options = (union all_known_options *)(optionsloc + offset);
switch (all_options->as_base.optionnum) {
case OPTION_NUMBER_END:
offset = optionsize;
break;
case OPTION_NUMBER_NONE:
offset += 1;
continue;
case OPTION_NUMBER_MSS:
nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d Size: %d\n",
__FUNCTION__,
all_options->as_mss.length, offset, optionsize);
got_mss_option = 1;
if (all_options->as_mss.length != 4) {
return 1;
} else {
tmp = ntohs(all_options->as_mss.mss);
if (tmp > 0 && tmp < cm_node->tcp_cntxt.mss)
cm_node->tcp_cntxt.mss = tmp;
}
break;
case OPTION_NUMBER_WINDOW_SCALE:
cm_node->tcp_cntxt.snd_wscale = all_options->as_windowscale.shiftcount;
break;
case OPTION_NUMBER_WRITE0:
cm_node->send_write0 = 1;
break;
default:
nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
all_options->as_base.optionnum);
break;
}
offset += all_options->as_base.length;
}
if ((!got_mss_option) && (syn_packet))
cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
return 0;
}
/**
* process_packet
*/
static int process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
struct nes_cm_core *cm_core)
{
int optionsize;
int datasize;
int ret = 0;
struct tcphdr *tcph = tcp_hdr(skb);
u32 inc_sequence;
if (cm_node->state == NES_CM_STATE_SYN_SENT && tcph->syn) {
inc_sequence = ntohl(tcph->seq);
cm_node->tcp_cntxt.rcv_nxt = inc_sequence;
}
if ((!tcph) || (cm_node->state == NES_CM_STATE_TSA)) {
BUG_ON(!tcph);
atomic_inc(&cm_accel_dropped_pkts);
return -1;
}
if (tcph->rst) {
atomic_inc(&cm_resets_recvd);
nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u. refcnt=%d\n",
cm_node, cm_node->state, atomic_read(&cm_node->ref_count));
switch (cm_node->state) {
case NES_CM_STATE_LISTENING:
rem_ref_cm_node(cm_core, cm_node);
break;
case NES_CM_STATE_TSA:
case NES_CM_STATE_CLOSED:
break;
case NES_CM_STATE_SYN_RCVD:
nes_debug(NES_DBG_CM, "Received a reset for local 0x%08X:%04X,"
" remote 0x%08X:%04X, node state = %u\n",
cm_node->loc_addr, cm_node->loc_port,
cm_node->rem_addr, cm_node->rem_port,
cm_node->state);
rem_ref_cm_node(cm_core, cm_node);
break;
case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
case NES_CM_STATE_ESTABLISHED:
case NES_CM_STATE_MPAREQ_SENT:
default:
nes_debug(NES_DBG_CM, "Received a reset for local 0x%08X:%04X,"
" remote 0x%08X:%04X, node state = %u refcnt=%d\n",
cm_node->loc_addr, cm_node->loc_port,
cm_node->rem_addr, cm_node->rem_port,
cm_node->state, atomic_read(&cm_node->ref_count));
// create event
cm_node->state = NES_CM_STATE_CLOSED;
create_event(cm_node, NES_CM_EVENT_ABORTED);
break;
}
return -1;
}
optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
skb_pull(skb, ip_hdr(skb)->ihl << 2);
skb_pull(skb, tcph->doff << 2);
datasize = skb->len;
inc_sequence = ntohl(tcph->seq);
nes_debug(NES_DBG_CM, "datasize = %u, sequence = 0x%08X, ack_seq = 0x%08X,"
" rcv_nxt = 0x%08X Flags: %s %s.\n",
datasize, inc_sequence, ntohl(tcph->ack_seq),
cm_node->tcp_cntxt.rcv_nxt, (tcph->syn ? "SYN":""),
(tcph->ack ? "ACK":""));
if (!tcph->syn && (inc_sequence != cm_node->tcp_cntxt.rcv_nxt)
) {
nes_debug(NES_DBG_CM, "dropping packet, datasize = %u, sequence = 0x%08X,"
" ack_seq = 0x%08X, rcv_nxt = 0x%08X Flags: %s.\n",
datasize, inc_sequence, ntohl(tcph->ack_seq),
cm_node->tcp_cntxt.rcv_nxt, (tcph->ack ? "ACK":""));
if (cm_node->state == NES_CM_STATE_LISTENING) {
rem_ref_cm_node(cm_core, cm_node);
}
return -1;
}
cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
if (optionsize) {
u8 *optionsloc = (u8 *)&tcph[1];
if (process_options(cm_node, optionsloc, optionsize, (u32)tcph->syn)) {
nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n", __FUNCTION__, cm_node);
send_reset(cm_node);
if (cm_node->state != NES_CM_STATE_SYN_SENT)
rem_ref_cm_node(cm_core, cm_node);
return 0;
}
} else if (tcph->syn)
cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
cm_node->tcp_cntxt.snd_wscale;
if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd) {
cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
}
if (tcph->ack) {
cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
switch (cm_node->state) {
case NES_CM_STATE_SYN_RCVD:
case NES_CM_STATE_SYN_SENT:
/* read and stash current sequence number */
if (cm_node->tcp_cntxt.rem_ack_num != cm_node->tcp_cntxt.loc_seq_num) {
nes_debug(NES_DBG_CM, "ERROR - cm_node->tcp_cntxt.rem_ack_num !="
" cm_node->tcp_cntxt.loc_seq_num\n");
send_reset(cm_node);
return 0;
}
if (cm_node->state == NES_CM_STATE_SYN_SENT)
cm_node->state = NES_CM_STATE_ONE_SIDE_ESTABLISHED;
else {
cm_node->state = NES_CM_STATE_ESTABLISHED;
}
break;
case NES_CM_STATE_LAST_ACK:
cm_node->state = NES_CM_STATE_CLOSED;
break;
case NES_CM_STATE_FIN_WAIT1:
cm_node->state = NES_CM_STATE_FIN_WAIT2;
break;
case NES_CM_STATE_CLOSING:
cm_node->state = NES_CM_STATE_TIME_WAIT;
/* need to schedule this to happen in 2MSL timeouts */
cm_node->state = NES_CM_STATE_CLOSED;
break;
case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
case NES_CM_STATE_ESTABLISHED:
case NES_CM_STATE_MPAREQ_SENT:
case NES_CM_STATE_CLOSE_WAIT:
case NES_CM_STATE_TIME_WAIT:
case NES_CM_STATE_CLOSED:
break;
case NES_CM_STATE_LISTENING:
nes_debug(NES_DBG_CM, "Received an ACK on a listening port (SYN %d)\n", tcph->syn);
cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
send_reset(cm_node);
/* send_reset bumps refcount, this should have been a new node */
rem_ref_cm_node(cm_core, cm_node);
return -1;
break;
case NES_CM_STATE_TSA:
nes_debug(NES_DBG_CM, "Received a packet with the ack bit set while in TSA state\n");
break;
case NES_CM_STATE_UNKNOWN:
case NES_CM_STATE_INITED:
case NES_CM_STATE_ACCEPTING:
case NES_CM_STATE_FIN_WAIT2:
default:
nes_debug(NES_DBG_CM, "Received ack from unknown state: %x\n",
cm_node->state);
send_reset(cm_node);
break;
}
}
if (tcph->syn) {
if (cm_node->state == NES_CM_STATE_LISTENING) {
/* do not exceed backlog */
atomic_inc(&cm_node->listener->pend_accepts_cnt);
if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
cm_node->listener->backlog) {
nes_debug(NES_DBG_CM, "drop syn due to backlog pressure \n");
cm_backlog_drops++;
atomic_dec(&cm_node->listener->pend_accepts_cnt);
rem_ref_cm_node(cm_core, cm_node);
return 0;
}
cm_node->accept_pend = 1;
}
if (datasize == 0)
cm_node->tcp_cntxt.rcv_nxt ++;
if (cm_node->state == NES_CM_STATE_LISTENING) {
cm_node->state = NES_CM_STATE_SYN_RCVD;
send_syn(cm_node, 1);
}
if (cm_node->state == NES_CM_STATE_ONE_SIDE_ESTABLISHED) {
cm_node->state = NES_CM_STATE_ESTABLISHED;
/* send final handshake ACK */
ret = send_ack(cm_node);
if (ret < 0)
return ret;
cm_node->state = NES_CM_STATE_MPAREQ_SENT;
ret = send_mpa_request(cm_node);
if (ret < 0)
return ret;
}
}
if (tcph->fin) {
cm_node->tcp_cntxt.rcv_nxt++;
switch (cm_node->state) {
case NES_CM_STATE_SYN_RCVD:
case NES_CM_STATE_SYN_SENT:
case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
case NES_CM_STATE_ESTABLISHED:
case NES_CM_STATE_ACCEPTING:
case NES_CM_STATE_MPAREQ_SENT:
cm_node->state = NES_CM_STATE_CLOSE_WAIT;
cm_node->state = NES_CM_STATE_LAST_ACK;
ret = send_fin(cm_node, NULL);
break;
case NES_CM_STATE_FIN_WAIT1:
cm_node->state = NES_CM_STATE_CLOSING;
ret = send_ack(cm_node);
break;
case NES_CM_STATE_FIN_WAIT2:
cm_node->state = NES_CM_STATE_TIME_WAIT;
cm_node->tcp_cntxt.loc_seq_num ++;
ret = send_ack(cm_node);
/* need to schedule this to happen in 2MSL timeouts */
cm_node->state = NES_CM_STATE_CLOSED;
break;
case NES_CM_STATE_CLOSE_WAIT:
case NES_CM_STATE_LAST_ACK:
case NES_CM_STATE_CLOSING:
case NES_CM_STATE_TSA:
default:
nes_debug(NES_DBG_CM, "Received a fin while in %x state\n",
cm_node->state);
ret = -EINVAL;
break;
}
}
if (datasize) {
u8 *dataloc = skb->data;
/* figure out what state we are in and handle transition to next state */
switch (cm_node->state) {
case NES_CM_STATE_LISTENING:
case NES_CM_STATE_SYN_RCVD:
case NES_CM_STATE_SYN_SENT:
case NES_CM_STATE_FIN_WAIT1:
case NES_CM_STATE_FIN_WAIT2:
case NES_CM_STATE_CLOSE_WAIT:
case NES_CM_STATE_LAST_ACK:
case NES_CM_STATE_CLOSING:
break;
case NES_CM_STATE_MPAREQ_SENT:
/* recv the mpa res frame, ret=frame len (incl priv data) */
ret = parse_mpa(cm_node, dataloc, datasize);
if (ret < 0)
break;
/* set the req frame payload len in skb */
/* we are done handling this state, set node to a TSA state */
cm_node->state = NES_CM_STATE_TSA;
send_ack(cm_node);
create_event(cm_node, NES_CM_EVENT_CONNECTED);
break;
case NES_CM_STATE_ESTABLISHED:
/* we are expecting an MPA req frame */
ret = parse_mpa(cm_node, dataloc, datasize);
if (ret < 0) {
break;
}
cm_node->state = NES_CM_STATE_TSA;
send_ack(cm_node);
/* we got a valid MPA request, create an event */
create_event(cm_node, NES_CM_EVENT_MPA_REQ);
break;
case NES_CM_STATE_TSA:
handle_exception_pkt(cm_node, skb);
break;
case NES_CM_STATE_UNKNOWN:
case NES_CM_STATE_INITED:
default:
ret = -1;
}
}
return ret;
}
/**
* mini_cm_listen - create a listen node with params
*/
static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
{
struct nes_cm_listener *listener;
unsigned long flags;
nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
cm_info->loc_addr, cm_info->loc_port);
/* cannot have multiple matching listeners */
listener = find_listener(cm_core, htonl(cm_info->loc_addr),
htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
/* find automatically incs ref count ??? */
atomic_dec(&listener->ref_count);
nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
return NULL;
}
if (!listener) {
/* create a CM listen node (1/2 node to compare incoming traffic to) */
listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
if (!listener) {
nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
return NULL;
}
memset(listener, 0, sizeof(struct nes_cm_listener));
listener->loc_addr = htonl(cm_info->loc_addr);
listener->loc_port = htons(cm_info->loc_port);
listener->reused_node = 0;
atomic_set(&listener->ref_count, 1);
}
/* pasive case */
/* find already inc'ed the ref count */
else {
listener->reused_node = 1;
}
listener->cm_id = cm_info->cm_id;
atomic_set(&listener->pend_accepts_cnt, 0);
listener->cm_core = cm_core;
listener->nesvnic = nesvnic;
atomic_inc(&cm_core->node_cnt);
atomic_inc(&cm_core->session_id);
listener->session_id = (u32)(atomic_read(&cm_core->session_id) + current->tgid);
listener->conn_type = cm_info->conn_type;
listener->backlog = cm_info->backlog;
listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
if (!listener->reused_node) {
spin_lock_irqsave(&cm_core->listen_list_lock, flags);
list_add(&listener->list, &cm_core->listen_list.list);
spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
atomic_inc(&cm_core->listen_node_cnt);
}
nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
" listener = %p, backlog = %d, cm_id = %p.\n",
cm_info->loc_addr, cm_info->loc_port,
listener, listener->backlog, listener->cm_id);
return listener;
}
/**
* mini_cm_connect - make a connection node with params
*/
static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
struct nes_vnic *nesvnic,
struct ietf_mpa_frame *mpa_frame,
struct nes_cm_info *cm_info)
{
int ret = 0;
struct nes_cm_node *cm_node;
struct nes_cm_listener *loopbackremotelistener;
struct nes_cm_node *loopbackremotenode;
struct nes_cm_info loopback_cm_info;
u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) +
ntohs(mpa_frame->priv_data_len);
cm_info->loc_addr = htonl(cm_info->loc_addr);
cm_info->rem_addr = htonl(cm_info->rem_addr);
cm_info->loc_port = htons(cm_info->loc_port);
cm_info->rem_port = htons(cm_info->rem_port);
/* create a CM connection node */
cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
if (!cm_node)
return NULL;
// set our node side to client (active) side
cm_node->tcp_cntxt.client = 1;
cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
if (cm_info->loc_addr == cm_info->rem_addr) {
loopbackremotelistener = find_listener(cm_core, cm_node->rem_addr,
cm_node->rem_port, NES_CM_LISTENER_ACTIVE_STATE);
if (loopbackremotelistener == NULL) {
create_event(cm_node, NES_CM_EVENT_ABORTED);
} else {
atomic_inc(&cm_loopbacks);
loopback_cm_info = *cm_info;
loopback_cm_info.loc_port = cm_info->rem_port;
loopback_cm_info.rem_port = cm_info->loc_port;
loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
loopbackremotenode = make_cm_node(cm_core, nesvnic, &loopback_cm_info,
loopbackremotelistener);
loopbackremotenode->loopbackpartner = cm_node;
loopbackremotenode->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
cm_node->loopbackpartner = loopbackremotenode;
memcpy(loopbackremotenode->mpa_frame_buf, &mpa_frame->priv_data,
mpa_frame_size);
loopbackremotenode->mpa_frame_size = mpa_frame_size -
sizeof(struct ietf_mpa_frame);
// we are done handling this state, set node to a TSA state
cm_node->state = NES_CM_STATE_TSA;
cm_node->tcp_cntxt.rcv_nxt = loopbackremotenode->tcp_cntxt.loc_seq_num;
loopbackremotenode->tcp_cntxt.rcv_nxt = cm_node->tcp_cntxt.loc_seq_num;
cm_node->tcp_cntxt.max_snd_wnd = loopbackremotenode->tcp_cntxt.rcv_wnd;
loopbackremotenode->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
cm_node->tcp_cntxt.snd_wnd = loopbackremotenode->tcp_cntxt.rcv_wnd;
loopbackremotenode->tcp_cntxt.snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
cm_node->tcp_cntxt.snd_wscale = loopbackremotenode->tcp_cntxt.rcv_wscale;
loopbackremotenode->tcp_cntxt.snd_wscale = cm_node->tcp_cntxt.rcv_wscale;
create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
}
return cm_node;
}
/* set our node side to client (active) side */
cm_node->tcp_cntxt.client = 1;
/* init our MPA frame ptr */
memcpy(&cm_node->mpa_frame, mpa_frame, mpa_frame_size);
cm_node->mpa_frame_size = mpa_frame_size;
/* send a syn and goto syn sent state */
cm_node->state = NES_CM_STATE_SYN_SENT;
ret = send_syn(cm_node, 0);
nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X, port=0x%04x,"
" cm_node=%p, cm_id = %p.\n",
cm_node->rem_addr, cm_node->rem_port, cm_node, cm_node->cm_id);
return cm_node;
}
/**
* mini_cm_accept - accept a connection
* This function is never called
*/
static int mini_cm_accept(struct nes_cm_core *cm_core, struct ietf_mpa_frame *mpa_frame,
struct nes_cm_node *cm_node)
{
return 0;
}
/**
* mini_cm_reject - reject and teardown a connection
*/
static int mini_cm_reject(struct nes_cm_core *cm_core,
struct ietf_mpa_frame *mpa_frame,
struct nes_cm_node *cm_node)
{
int ret = 0;
struct sk_buff *skb;
u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) +
ntohs(mpa_frame->priv_data_len);
skb = get_free_pkt(cm_node);
if (!skb) {
nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
return -1;
}
/* send an MPA Request frame */
form_cm_frame(skb, cm_node, NULL, 0, mpa_frame, mpa_frame_size, SET_ACK | SET_FIN);
ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
cm_node->state = NES_CM_STATE_CLOSED;
ret = send_fin(cm_node, NULL);
if (ret < 0) {
printk(KERN_INFO PFX "failed to send MPA Reply (reject)\n");
return ret;
}
return ret;
}
/**
* mini_cm_close
*/
static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
{
int ret = 0;
if (!cm_core || !cm_node)
return -EINVAL;
switch (cm_node->state) {
/* if passed in node is null, create a reference key node for node search */
/* check if we found an owner node for this pkt */
case NES_CM_STATE_SYN_RCVD:
case NES_CM_STATE_SYN_SENT:
case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
case NES_CM_STATE_ESTABLISHED:
case NES_CM_STATE_ACCEPTING:
case NES_CM_STATE_MPAREQ_SENT:
cm_node->state = NES_CM_STATE_FIN_WAIT1;
send_fin(cm_node, NULL);
break;
case NES_CM_STATE_CLOSE_WAIT:
cm_node->state = NES_CM_STATE_LAST_ACK;
send_fin(cm_node, NULL);
break;
case NES_CM_STATE_FIN_WAIT1:
case NES_CM_STATE_FIN_WAIT2:
case NES_CM_STATE_LAST_ACK:
case NES_CM_STATE_TIME_WAIT:
case NES_CM_STATE_CLOSING:
ret = -1;
break;
case NES_CM_STATE_LISTENING:
case NES_CM_STATE_UNKNOWN:
case NES_CM_STATE_INITED:
case NES_CM_STATE_CLOSED:
case NES_CM_STATE_TSA:
ret = rem_ref_cm_node(cm_core, cm_node);
break;
}
cm_node->cm_id = NULL;
return ret;
}
/**
* recv_pkt - recv an ETHERNET packet, and process it through CM
* node state machine
*/
static int mini_cm_recv_pkt(struct nes_cm_core *cm_core, struct nes_vnic *nesvnic,
struct sk_buff *skb)
{
struct nes_cm_node *cm_node = NULL;
struct nes_cm_listener *listener = NULL;
struct iphdr *iph;
struct tcphdr *tcph;
struct nes_cm_info nfo;
int ret = 0;
if (!skb || skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
ret = -EINVAL;
goto out;
}
iph = (struct iphdr *)skb->data;
tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
skb_reset_network_header(skb);
skb_set_transport_header(skb, sizeof(*tcph));
skb->len = ntohs(iph->tot_len);
nfo.loc_addr = ntohl(iph->daddr);
nfo.loc_port = ntohs(tcph->dest);
nfo.rem_addr = ntohl(iph->saddr);
nfo.rem_port = ntohs(tcph->source);
nes_debug(NES_DBG_CM, "Received packet: dest=0x%08X:0x%04X src=0x%08X:0x%04X\n",
iph->daddr, tcph->dest, iph->saddr, tcph->source);
/* note: this call is going to increment cm_node ref count */
cm_node = find_node(cm_core,
nfo.rem_port, nfo.rem_addr,
nfo.loc_port, nfo.loc_addr);
if (!cm_node) {
listener = find_listener(cm_core, nfo.loc_addr, nfo.loc_port,
NES_CM_LISTENER_ACTIVE_STATE);
if (listener) {
nfo.cm_id = listener->cm_id;
nfo.conn_type = listener->conn_type;
} else {
nfo.cm_id = NULL;
nfo.conn_type = 0;
}
cm_node = make_cm_node(cm_core, nesvnic, &nfo, listener);
if (!cm_node) {
nes_debug(NES_DBG_CM, "Unable to allocate node\n");
if (listener) {
nes_debug(NES_DBG_CM, "unable to allocate node and decrementing listener refcount\n");
atomic_dec(&listener->ref_count);
}
ret = -1;
goto out;
}
if (!listener) {
nes_debug(NES_DBG_CM, "Packet found for unknown port %x refcnt=%d\n",
nfo.loc_port, atomic_read(&cm_node->ref_count));
if (!tcph->rst) {
nes_debug(NES_DBG_CM, "Packet found for unknown port=%d"
" rem_port=%d refcnt=%d\n",
nfo.loc_port, nfo.rem_port, atomic_read(&cm_node->ref_count));
cm_node->tcp_cntxt.rcv_nxt = ntohl(tcph->seq);
cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
send_reset(cm_node);
}
rem_ref_cm_node(cm_core, cm_node);
ret = -1;
goto out;
}
add_ref_cm_node(cm_node);
cm_node->state = NES_CM_STATE_LISTENING;
}
nes_debug(NES_DBG_CM, "Processing Packet for node %p, data = (%p):\n",
cm_node, skb->data);
process_packet(cm_node, skb, cm_core);
rem_ref_cm_node(cm_core, cm_node);
out:
if (skb)
dev_kfree_skb_any(skb);
return ret;
}
/**
* nes_cm_alloc_core - allocate a top level instance of a cm core
*/
static struct nes_cm_core *nes_cm_alloc_core(void)
{
int i;
struct nes_cm_core *cm_core;
struct sk_buff *skb = NULL;
/* setup the CM core */
/* alloc top level core control structure */
cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
if (!cm_core)
return NULL;
INIT_LIST_HEAD(&cm_core->connected_nodes);
init_timer(&cm_core->tcp_timer);
cm_core->tcp_timer.function = nes_cm_timer_tick;
cm_core->mtu = NES_CM_DEFAULT_MTU;
cm_core->state = NES_CM_STATE_INITED;
cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
atomic_set(&cm_core->session_id, 0);
atomic_set(&cm_core->events_posted, 0);
/* init the packet lists */
skb_queue_head_init(&cm_core->tx_free_list);
for (i = 0; i < NES_CM_DEFAULT_FRAME_CNT; i++) {
skb = dev_alloc_skb(cm_core->mtu);
if (!skb) {
kfree(cm_core);
return NULL;
}
/* add 'raw' skb to free frame list */
skb_queue_head(&cm_core->tx_free_list, skb);
}
cm_core->api = &nes_cm_api;
spin_lock_init(&cm_core->ht_lock);
spin_lock_init(&cm_core->listen_list_lock);
INIT_LIST_HEAD(&cm_core->listen_list.list);
nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
cm_core->event_wq = create_singlethread_workqueue("nesewq");
cm_core->post_event = nes_cm_post_event;
nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
print_core(cm_core);
return cm_core;
}
/**
* mini_cm_dealloc_core - deallocate a top level instance of a cm core
*/
static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
{
nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
if (!cm_core)
return -EINVAL;
barrier();
if (timer_pending(&cm_core->tcp_timer)) {
del_timer(&cm_core->tcp_timer);
}
destroy_workqueue(cm_core->event_wq);
destroy_workqueue(cm_core->disconn_wq);
nes_debug(NES_DBG_CM, "\n");
kfree(cm_core);
return 0;
}
/**
* mini_cm_get
*/
static int mini_cm_get(struct nes_cm_core *cm_core)
{
return cm_core->state;
}
/**
* mini_cm_set
*/
static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
{
int ret = 0;
switch (type) {
case NES_CM_SET_PKT_SIZE:
cm_core->mtu = value;
break;
case NES_CM_SET_FREE_PKT_Q_SIZE:
cm_core->free_tx_pkt_max = value;
break;
default:
/* unknown set option */
ret = -EINVAL;
}
return ret;
}
/**
* nes_cm_init_tsa_conn setup HW; MPA frames must be
* successfully exchanged when this is called
*/
static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
{
int ret = 0;
if (!nesqp)
return -EINVAL;
nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
NES_QPCONTEXT_MISC_DROS);
if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
(u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
(cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
(cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
nesqp->nesqp_context->ts_recent = 0;
nesqp->nesqp_context->ts_age = 0;
nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
cm_node->tcp_cntxt.rcv_wscale);
nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
nesqp->nesqp_context->srtt = 0;
nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
" Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
le32_to_cpu(nesqp->nesqp_context->snd_nxt),
cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
le32_to_cpu(nesqp->nesqp_context->misc));
nes_debug(NES_DBG_CM, " snd_wnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
nes_debug(NES_DBG_CM, " snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
nes_debug(NES_DBG_CM, " max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
cm_node->state = NES_CM_STATE_TSA;
return ret;
}
/**
* nes_cm_disconn
*/
int nes_cm_disconn(struct nes_qp *nesqp)
{
unsigned long flags;
spin_lock_irqsave(&nesqp->lock, flags);
if (nesqp->disconn_pending == 0) {
nesqp->disconn_pending++;
spin_unlock_irqrestore(&nesqp->lock, flags);
/* nes_add_ref(&nesqp->ibqp); */
/* init our disconnect work element, to */
INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
} else {
spin_unlock_irqrestore(&nesqp->lock, flags);
nes_rem_ref(&nesqp->ibqp);
}
return 0;
}
/**
* nes_disconnect_worker
*/
static void nes_disconnect_worker(struct work_struct *work)
{
struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
nesqp->last_aeq, nesqp->hwqp.qp_id);
nes_cm_disconn_true(nesqp);
}
/**
* nes_cm_disconn_true
*/
static int nes_cm_disconn_true(struct nes_qp *nesqp)
{
unsigned long flags;
int ret = 0;
struct iw_cm_id *cm_id;
struct iw_cm_event cm_event;
struct nes_vnic *nesvnic;
u16 last_ae;
u8 original_hw_tcp_state;
u8 original_ibqp_state;
u8 issued_disconnect_reset = 0;
if (!nesqp) {
nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
return -1;
}
spin_lock_irqsave(&nesqp->lock, flags);
cm_id = nesqp->cm_id;
/* make sure we havent already closed this connection */
if (!cm_id) {
nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
nesqp->hwqp.qp_id);
spin_unlock_irqrestore(&nesqp->lock, flags);
nes_rem_ref(&nesqp->ibqp);
return -1;
}
nesvnic = to_nesvnic(nesqp->ibqp.device);
nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
original_hw_tcp_state = nesqp->hw_tcp_state;
original_ibqp_state = nesqp->ibqp_state;
last_ae = nesqp->last_aeq;
nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
if ((nesqp->cm_id) && (cm_id->event_handler)) {
if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
((original_ibqp_state == IB_QPS_RTS) &&
(last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
atomic_inc(&cm_disconnects);
cm_event.event = IW_CM_EVENT_DISCONNECT;
if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
issued_disconnect_reset = 1;
cm_event.status = IW_CM_EVENT_STATUS_RESET;
nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event (status reset) for "
" QP%u, cm_id = %p. \n",
nesqp->hwqp.qp_id, cm_id);
} else {
cm_event.status = IW_CM_EVENT_STATUS_OK;
}
cm_event.local_addr = cm_id->local_addr;
cm_event.remote_addr = cm_id->remote_addr;
cm_event.private_data = NULL;
cm_event.private_data_len = 0;
nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event for "
" QP%u, SQ Head = %u, SQ Tail = %u. cm_id = %p, refcount = %u.\n",
nesqp->hwqp.qp_id,
nesqp->hwqp.sq_head, nesqp->hwqp.sq_tail, cm_id,
atomic_read(&nesqp->refcount));
spin_unlock_irqrestore(&nesqp->lock, flags);
ret = cm_id->event_handler(cm_id, &cm_event);
if (ret)
nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
spin_lock_irqsave(&nesqp->lock, flags);
}
nesqp->disconn_pending = 0;
/* There might have been another AE while the lock was released */
original_hw_tcp_state = nesqp->hw_tcp_state;
original_ibqp_state = nesqp->ibqp_state;
last_ae = nesqp->last_aeq;
if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
(original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
(last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
(last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
atomic_inc(&cm_closes);
nesqp->cm_id = NULL;
nesqp->in_disconnect = 0;
spin_unlock_irqrestore(&nesqp->lock, flags);
nes_disconnect(nesqp, 1);
cm_id->provider_data = nesqp;
/* Send up the close complete event */
cm_event.event = IW_CM_EVENT_CLOSE;
cm_event.status = IW_CM_EVENT_STATUS_OK;
cm_event.provider_data = cm_id->provider_data;
cm_event.local_addr = cm_id->local_addr;
cm_event.remote_addr = cm_id->remote_addr;
cm_event.private_data = NULL;
cm_event.private_data_len = 0;
ret = cm_id->event_handler(cm_id, &cm_event);
if (ret) {
nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
}
cm_id->rem_ref(cm_id);
spin_lock_irqsave(&nesqp->lock, flags);
if (nesqp->flush_issued == 0) {
nesqp->flush_issued = 1;
spin_unlock_irqrestore(&nesqp->lock, flags);
flush_wqes(nesvnic->nesdev, nesqp, NES_CQP_FLUSH_RQ, 1);
} else {
spin_unlock_irqrestore(&nesqp->lock, flags);
}
/* This reference is from either ModifyQP or the AE processing,
there is still a race here with modifyqp */
nes_rem_ref(&nesqp->ibqp);
} else {
cm_id = nesqp->cm_id;
spin_unlock_irqrestore(&nesqp->lock, flags);
/* check to see if the inbound reset beat the outbound reset */
if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
nes_debug(NES_DBG_CM, "QP%u: Decing refcount due to inbound reset"
" beating the outbound reset.\n",
nesqp->hwqp.qp_id);
nes_rem_ref(&nesqp->ibqp);
}
}
} else {
nesqp->disconn_pending = 0;
spin_unlock_irqrestore(&nesqp->lock, flags);
}
nes_rem_ref(&nesqp->ibqp);
return 0;
}
/**
* nes_disconnect
*/
static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
{
int ret = 0;
struct nes_vnic *nesvnic;
struct nes_device *nesdev;
nesvnic = to_nesvnic(nesqp->ibqp.device);
if (!nesvnic)
return -EINVAL;
nesdev = nesvnic->nesdev;
nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
atomic_read(&nesvnic->netdev->refcnt));
if (nesqp->active_conn) {
/* indicate this connection is NOT active */
nesqp->active_conn = 0;
} else {
/* Need to free the Last Streaming Mode Message */
if (nesqp->ietf_frame) {
pci_free_consistent(nesdev->pcidev,
nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
nesqp->ietf_frame, nesqp->ietf_frame_pbase);
}
}
/* close the CM node down if it is still active */
if (nesqp->cm_node) {
nes_debug(NES_DBG_CM, "Call close API\n");
g_cm_core->api->close(g_cm_core, nesqp->cm_node);
nesqp->cm_node = NULL;
}
return ret;
}
/**
* nes_accept
*/
int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
u64 u64temp;
struct ib_qp *ibqp;
struct nes_qp *nesqp;
struct nes_vnic *nesvnic;
struct nes_device *nesdev;
struct nes_cm_node *cm_node;
struct nes_adapter *adapter;
struct ib_qp_attr attr;
struct iw_cm_event cm_event;
struct nes_hw_qp_wqe *wqe;
struct nes_v4_quad nes_quad;
u32 crc_value;
int ret;
ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
if (!ibqp)
return -EINVAL;
/* get all our handles */
nesqp = to_nesqp(ibqp);
nesvnic = to_nesvnic(nesqp->ibqp.device);
nesdev = nesvnic->nesdev;
adapter = nesdev->nesadapter;
nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
nesvnic, nesvnic->netdev, nesvnic->netdev->name);
/* since this is from a listen, we were able to put node handle into cm_id */
cm_node = (struct nes_cm_node *)cm_id->provider_data;
/* associate the node with the QP */
nesqp->cm_node = (void *)cm_node;
nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu\n",
nesqp->hwqp.qp_id, cm_node, jiffies);
atomic_inc(&cm_accepts);
nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
atomic_read(&nesvnic->netdev->refcnt));
/* allocate the ietf frame and space for private data */
nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
&nesqp->ietf_frame_pbase);
if (!nesqp->ietf_frame) {
nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
return -ENOMEM;
}
/* setup the MPA frame */
nesqp->private_data_len = conn_param->private_data_len;
memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
conn_param->private_data_len);
nesqp->ietf_frame->priv_data_len = cpu_to_be16(conn_param->private_data_len);
nesqp->ietf_frame->rev = mpa_version;
nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
/* setup our first outgoing iWarp send WQE (the IETF frame response) */
wqe = &nesqp->hwqp.sq_vbase[0];
if (cm_id->remote_addr.sin_addr.s_addr != cm_id->local_addr.sin_addr.s_addr) {
u64temp = (unsigned long)nesqp;
u64temp |= NES_SW_CONTEXT_ALIGN>>1;
set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
u64temp);
wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING | NES_IWARP_SQ_WQE_WRPDU);
wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
cpu_to_le32(conn_param->private_data_len + sizeof(struct ietf_mpa_frame));
wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] =
cpu_to_le32((u32)nesqp->ietf_frame_pbase);
wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] =
cpu_to_le32((u32)((u64)nesqp->ietf_frame_pbase >> 32));
wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
cpu_to_le32(conn_param->private_data_len + sizeof(struct ietf_mpa_frame));
wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
NES_QPCONTEXT_ORDIRD_LSMM_PRESENT | NES_QPCONTEXT_ORDIRD_WRPDU);
} else {
nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
NES_QPCONTEXT_ORDIRD_WRPDU | NES_QPCONTEXT_ORDIRD_ALSMM));
}
nesqp->skip_lsmm = 1;
/* Cache the cm_id in the qp */
nesqp->cm_id = cm_id;
cm_node->cm_id = cm_id;
/* nesqp->cm_node = (void *)cm_id->provider_data; */
cm_id->provider_data = nesqp;
nesqp->active_conn = 0;
nes_cm_init_tsa_conn(nesqp, cm_node);
nesqp->nesqp_context->tcpPorts[0] = cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
nesqp->nesqp_context->tcpPorts[1] = cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
nesqp->nesqp_context->ip0 = cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
nesqp->nesqp_context->misc2 |= cpu_to_le32(
(u32)PCI_FUNC(nesdev->pcidev->devfn) << NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
nes_arp_table(nesdev, le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
NES_ARP_RESOLVE) << 16);
nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
memset(&nes_quad, 0, sizeof(nes_quad));
nes_quad.DstIpAdrIndex = cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
/* Produce hash key */
crc_value = get_crc_value(&nes_quad);
nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
nesqp->hte_index &= adapter->hte_index_mask;
nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = 0x%08X:0x%04X,"
" rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + private data length=%zu.\n",
nesqp->hwqp.qp_id,
ntohl(cm_id->remote_addr.sin_addr.s_addr),
ntohs(cm_id->remote_addr.sin_port),
ntohl(cm_id->local_addr.sin_addr.s_addr),
ntohs(cm_id->local_addr.sin_port),
le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
le32_to_cpu(nesqp->nesqp_context->snd_nxt),
conn_param->private_data_len+sizeof(struct ietf_mpa_frame));
attr.qp_state = IB_QPS_RTS;
nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
/* notify OF layer that accept event was successfull */
cm_id->add_ref(cm_id);
cm_event.event = IW_CM_EVENT_ESTABLISHED;
cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
cm_event.provider_data = (void *)nesqp;
cm_event.local_addr = cm_id->local_addr;
cm_event.remote_addr = cm_id->remote_addr;
cm_event.private_data = NULL;
cm_event.private_data_len = 0;
ret = cm_id->event_handler(cm_id, &cm_event);
if (cm_node->loopbackpartner) {
cm_node->loopbackpartner->mpa_frame_size = nesqp->private_data_len;
/* copy entire MPA frame to our cm_node's frame */
memcpy(cm_node->loopbackpartner->mpa_frame_buf, nesqp->ietf_frame->priv_data,
nesqp->private_data_len);
create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
}
if (ret)
printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
__FUNCTION__, __LINE__, ret);
return 0;
}
/**
* nes_reject
*/
int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
{
struct nes_cm_node *cm_node;
struct nes_cm_core *cm_core;
atomic_inc(&cm_rejects);
cm_node = (struct nes_cm_node *) cm_id->provider_data;
cm_core = cm_node->cm_core;
cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
cm_node->mpa_frame.rev = mpa_version;
cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
return 0;
}
/**
* nes_connect
* setup and launch cm connect node
*/
int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
{
struct ib_qp *ibqp;
struct nes_qp *nesqp;
struct nes_vnic *nesvnic;
struct nes_device *nesdev;
struct nes_cm_node *cm_node;
struct nes_cm_info cm_info;
ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
if (!ibqp)
return -EINVAL;
nesqp = to_nesqp(ibqp);
if (!nesqp)
return -EINVAL;
nesvnic = to_nesvnic(nesqp->ibqp.device);
if (!nesvnic)
return -EINVAL;
nesdev = nesvnic->nesdev;
if (!nesdev)
return -EINVAL;
atomic_inc(&cm_connects);
nesqp->ietf_frame = kzalloc(sizeof(struct ietf_mpa_frame) +
conn_param->private_data_len, GFP_KERNEL);
if (!nesqp->ietf_frame)
return -ENOMEM;
/* set qp as having an active connection */
nesqp->active_conn = 1;
nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = 0x%08X:0x%04X.\n",
nesqp->hwqp.qp_id,
ntohl(cm_id->remote_addr.sin_addr.s_addr),
ntohs(cm_id->remote_addr.sin_port),
ntohl(cm_id->local_addr.sin_addr.s_addr),
ntohs(cm_id->local_addr.sin_port));
/* cache the cm_id in the qp */
nesqp->cm_id = cm_id;
cm_id->provider_data = nesqp;
/* copy the private data */
if (conn_param->private_data_len) {
memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
conn_param->private_data_len);
}
nesqp->private_data_len = conn_param->private_data_len;
nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
nes_debug(NES_DBG_CM, "mpa private data len =%u\n", conn_param->private_data_len);
strcpy(&nesqp->ietf_frame->key[0], IEFT_MPA_KEY_REQ);
nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
nesqp->ietf_frame->rev = IETF_MPA_VERSION;
nesqp->ietf_frame->priv_data_len = htons(conn_param->private_data_len);
if (cm_id->local_addr.sin_addr.s_addr != cm_id->remote_addr.sin_addr.s_addr)
nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
/* set up the connection params for the node */
cm_info.loc_addr = (cm_id->local_addr.sin_addr.s_addr);
cm_info.loc_port = (cm_id->local_addr.sin_port);
cm_info.rem_addr = (cm_id->remote_addr.sin_addr.s_addr);
cm_info.rem_port = (cm_id->remote_addr.sin_port);
cm_info.cm_id = cm_id;
cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
cm_id->add_ref(cm_id);
nes_add_ref(&nesqp->ibqp);
/* create a connect CM node connection */
cm_node = g_cm_core->api->connect(g_cm_core, nesvnic, nesqp->ietf_frame, &cm_info);
if (!cm_node) {
if (cm_id->local_addr.sin_addr.s_addr != cm_id->remote_addr.sin_addr.s_addr)
nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
nes_rem_ref(&nesqp->ibqp);
kfree(nesqp->ietf_frame);
nesqp->ietf_frame = NULL;
cm_id->rem_ref(cm_id);
return -ENOMEM;
}
cm_node->apbvt_set = 1;
nesqp->cm_node = cm_node;
return 0;
}
/**
* nes_create_listen
*/
int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
{
struct nes_vnic *nesvnic;
struct nes_cm_listener *cm_node;
struct nes_cm_info cm_info;
struct nes_adapter *adapter;
int err;
nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
cm_id, ntohs(cm_id->local_addr.sin_port));
nesvnic = to_nesvnic(cm_id->device);
if (!nesvnic)
return -EINVAL;
adapter = nesvnic->nesdev->nesadapter;
nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
nesvnic, nesvnic->netdev, nesvnic->netdev->name);
nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
/* setup listen params in our api call struct */
cm_info.loc_addr = nesvnic->local_ipaddr;
cm_info.loc_port = cm_id->local_addr.sin_port;
cm_info.backlog = backlog;
cm_info.cm_id = cm_id;
cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
if (!cm_node) {
printk("%s[%u] Error returned from listen API call\n",
__FUNCTION__, __LINE__);
return -ENOMEM;
}
cm_id->provider_data = cm_node;
if (!cm_node->reused_node) {
err = nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
PCI_FUNC(nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
if (err) {
printk("nes_manage_apbvt call returned %d.\n", err);
g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
return err;
}
cm_listens_created++;
}
cm_id->add_ref(cm_id);
cm_id->provider_data = (void *)cm_node;
return 0;
}
/**
* nes_destroy_listen
*/
int nes_destroy_listen(struct iw_cm_id *cm_id)
{
if (cm_id->provider_data)
g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
else
nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
cm_id->rem_ref(cm_id);
return 0;
}
/**
* nes_cm_recv
*/
int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
{
cm_packets_received++;
if ((g_cm_core) && (g_cm_core->api)) {
g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
} else {
nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
" cm is not setup properly.\n");
}
return 0;
}
/**
* nes_cm_start
* Start and init a cm core module
*/
int nes_cm_start(void)
{
nes_debug(NES_DBG_CM, "\n");
/* create the primary CM core, pass this handle to subsequent core inits */
g_cm_core = nes_cm_alloc_core();
if (g_cm_core) {
return 0;
} else {
return -ENOMEM;
}
}
/**
* nes_cm_stop
* stop and dealloc all cm core instances
*/
int nes_cm_stop(void)
{
g_cm_core->api->destroy_cm_core(g_cm_core);
return 0;
}
/**
* cm_event_connected
* handle a connected event, setup QPs and HW
*/
static void cm_event_connected(struct nes_cm_event *event)
{
u64 u64temp;
struct nes_qp *nesqp;
struct nes_vnic *nesvnic;
struct nes_device *nesdev;
struct nes_cm_node *cm_node;
struct nes_adapter *nesadapter;
struct ib_qp_attr attr;
struct iw_cm_id *cm_id;
struct iw_cm_event cm_event;
struct nes_hw_qp_wqe *wqe;
struct nes_v4_quad nes_quad;
u32 crc_value;
int ret;
/* get all our handles */
cm_node = event->cm_node;
cm_id = cm_node->cm_id;
nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
nesqp = (struct nes_qp *)cm_id->provider_data;
nesvnic = to_nesvnic(nesqp->ibqp.device);
nesdev = nesvnic->nesdev;
nesadapter = nesdev->nesadapter;
if (nesqp->destroyed) {
return;
}
atomic_inc(&cm_connecteds);
nes_debug(NES_DBG_CM, "QP%u attempting to connect to 0x%08X:0x%04X on"
" local port 0x%04X. jiffies = %lu.\n",
nesqp->hwqp.qp_id,
ntohl(cm_id->remote_addr.sin_addr.s_addr),
ntohs(cm_id->remote_addr.sin_port),
ntohs(cm_id->local_addr.sin_port),
jiffies);
nes_cm_init_tsa_conn(nesqp, cm_node);
/* set the QP tsa context */
nesqp->nesqp_context->tcpPorts[0] = cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
nesqp->nesqp_context->tcpPorts[1] = cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
nesqp->nesqp_context->ip0 = cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
nesqp->nesqp_context->misc2 |= cpu_to_le32(
(u32)PCI_FUNC(nesdev->pcidev->devfn) << NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
nes_arp_table(nesdev, le32_to_cpu(nesqp->nesqp_context->ip0),
NULL, NES_ARP_RESOLVE) << 16);
nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
nesqp->nesqp_context->ird_ord_sizes |=
cpu_to_le32((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
/* Adjust tail for not having a LSMM */
nesqp->hwqp.sq_tail = 1;
#if defined(NES_SEND_FIRST_WRITE)
if (cm_node->send_write0) {
nes_debug(NES_DBG_CM, "Sending first write.\n");
wqe = &nesqp->hwqp.sq_vbase[0];
u64temp = (unsigned long)nesqp;
u64temp |= NES_SW_CONTEXT_ALIGN>>1;
set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
u64temp);
wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] = cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
/* use the reserved spot on the WQ for the extra first WQE */
nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
NES_QPCONTEXT_ORDIRD_WRPDU | NES_QPCONTEXT_ORDIRD_ALSMM));
nesqp->skip_lsmm = 1;
nesqp->hwqp.sq_tail = 0;
nes_write32(nesdev->regs + NES_WQE_ALLOC,
(1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
}
#endif
memset(&nes_quad, 0, sizeof(nes_quad));
nes_quad.DstIpAdrIndex = cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
/* Produce hash key */
crc_value = get_crc_value(&nes_quad);
nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
nesqp->hte_index &= nesadapter->hte_index_mask;
nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
nesqp->ietf_frame = &cm_node->mpa_frame;
nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
/* modify QP state to rts */
attr.qp_state = IB_QPS_RTS;
nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
/* notify OF layer we successfully created the requested connection */
cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
cm_event.provider_data = cm_id->provider_data;
cm_event.local_addr.sin_family = AF_INET;
cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
cm_event.remote_addr = cm_id->remote_addr;
cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
ret = cm_id->event_handler(cm_id, &cm_event);
nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
if (ret)
printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
__FUNCTION__, __LINE__, ret);
nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = %lu\n",
nesqp->hwqp.qp_id, jiffies );
nes_rem_ref(&nesqp->ibqp);
return;
}
/**
* cm_event_connect_error
*/
static void cm_event_connect_error(struct nes_cm_event *event)
{
struct nes_qp *nesqp;
struct iw_cm_id *cm_id;
struct iw_cm_event cm_event;
/* struct nes_cm_info cm_info; */
int ret;
if (!event->cm_node)
return;
cm_id = event->cm_node->cm_id;
if (!cm_id) {
return;
}
nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
nesqp = cm_id->provider_data;
if (!nesqp) {
return;
}
/* notify OF layer about this connection error event */
/* cm_id->rem_ref(cm_id); */
nesqp->cm_id = NULL;
cm_id->provider_data = NULL;
cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
cm_event.provider_data = cm_id->provider_data;
cm_event.local_addr = cm_id->local_addr;
cm_event.remote_addr = cm_id->remote_addr;
cm_event.private_data = NULL;
cm_event.private_data_len = 0;
nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, remove_addr=%08x\n",
cm_event.local_addr.sin_addr.s_addr, cm_event.remote_addr.sin_addr.s_addr);
ret = cm_id->event_handler(cm_id, &cm_event);
nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
if (ret)
printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
__FUNCTION__, __LINE__, ret);
nes_rem_ref(&nesqp->ibqp);
cm_id->rem_ref(cm_id);
return;
}
/**
* cm_event_reset
*/
static void cm_event_reset(struct nes_cm_event *event)
{
struct nes_qp *nesqp;
struct iw_cm_id *cm_id;
struct iw_cm_event cm_event;
/* struct nes_cm_info cm_info; */
int ret;
if (!event->cm_node)
return;
if (!event->cm_node->cm_id)
return;
cm_id = event->cm_node->cm_id;
nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
nesqp = cm_id->provider_data;
nesqp->cm_id = NULL;
/* cm_id->provider_data = NULL; */
cm_event.event = IW_CM_EVENT_DISCONNECT;
cm_event.status = IW_CM_EVENT_STATUS_RESET;
cm_event.provider_data = cm_id->provider_data;
cm_event.local_addr = cm_id->local_addr;
cm_event.remote_addr = cm_id->remote_addr;
cm_event.private_data = NULL;
cm_event.private_data_len = 0;
ret = cm_id->event_handler(cm_id, &cm_event);
nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
/* notify OF layer about this connection error event */
cm_id->rem_ref(cm_id);
return;
}
/**
* cm_event_mpa_req
*/
static void cm_event_mpa_req(struct nes_cm_event *event)
{
struct iw_cm_id *cm_id;
struct iw_cm_event cm_event;
int ret;
struct nes_cm_node *cm_node;
cm_node = event->cm_node;
if (!cm_node)
return;
cm_id = cm_node->cm_id;
atomic_inc(&cm_connect_reqs);
nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
cm_node, cm_id, jiffies);
cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
cm_event.status = IW_CM_EVENT_STATUS_OK;
cm_event.provider_data = (void *)cm_node;
cm_event.local_addr.sin_family = AF_INET;
cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
cm_event.remote_addr.sin_family = AF_INET;
cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
cm_event.private_data = cm_node->mpa_frame_buf;
cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
ret = cm_id->event_handler(cm_id, &cm_event);
if (ret)
printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
__FUNCTION__, __LINE__, ret);
return;
}
static void nes_cm_event_handler(struct work_struct *);
/**
* nes_cm_post_event
* post an event to the cm event handler
*/
static int nes_cm_post_event(struct nes_cm_event *event)
{
atomic_inc(&event->cm_node->cm_core->events_posted);
add_ref_cm_node(event->cm_node);
event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
INIT_WORK(&event->event_work, nes_cm_event_handler);
nes_debug(NES_DBG_CM, "queue_work, event=%p\n", event);
queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
nes_debug(NES_DBG_CM, "Exit\n");
return 0;
}
/**
* nes_cm_event_handler
* worker function to handle cm events
* will free instance of nes_cm_event
*/
static void nes_cm_event_handler(struct work_struct *work)
{
struct nes_cm_event *event = container_of(work, struct nes_cm_event, event_work);
struct nes_cm_core *cm_core;
if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core)) {
return;
}
cm_core = event->cm_node->cm_core;
nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
event, event->type, atomic_read(&cm_core->events_posted));
switch (event->type) {
case NES_CM_EVENT_MPA_REQ:
cm_event_mpa_req(event);
nes_debug(NES_DBG_CM, "CM Event: MPA REQUEST\n");
break;
case NES_CM_EVENT_RESET:
nes_debug(NES_DBG_CM, "CM Event: RESET\n");
cm_event_reset(event);
break;
case NES_CM_EVENT_CONNECTED:
if ((!event->cm_node->cm_id) ||
(event->cm_node->state != NES_CM_STATE_TSA)) {
break;
}
cm_event_connected(event);
nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
break;
case NES_CM_EVENT_ABORTED:
if ((!event->cm_node->cm_id) || (event->cm_node->state == NES_CM_STATE_TSA)) {
break;
}
cm_event_connect_error(event);
nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
break;
case NES_CM_EVENT_DROPPED_PKT:
nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
break;
default:
nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
break;
}
atomic_dec(&cm_core->events_posted);
event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
rem_ref_cm_node(cm_core, event->cm_node);
kfree(event);
return;
}
