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iseries_veth.c

/* File veth.c created by Kyle A. Lucke on Mon Aug  7 2000. */
/*
 * IBM eServer iSeries Virtual Ethernet Device Driver
 * Copyright (C) 2001 Kyle A. Lucke (klucke@us.ibm.com), IBM Corp.
 * Substantially cleaned up by:
 * Copyright (C) 2003 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
 * Copyright (C) 2004-2005 Michael Ellerman, IBM Corporation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 *
 *
 * This module implements the virtual ethernet device for iSeries LPAR
 * Linux.  It uses hypervisor message passing to implement an
 * ethernet-like network device communicating between partitions on
 * the iSeries.
 *
 * The iSeries LPAR hypervisor currently allows for up to 16 different
 * virtual ethernets.  These are all dynamically configurable on
 * OS/400 partitions, but dynamic configuration is not supported under
 * Linux yet.  An ethXX network device will be created for each
 * virtual ethernet this partition is connected to.
 *
 * - This driver is responsible for routing packets to and from other
 *   partitions.  The MAC addresses used by the virtual ethernets
 *   contains meaning and must not be modified.
 *
 * - Having 2 virtual ethernets to the same remote partition DOES NOT
 *   double the available bandwidth.  The 2 devices will share the
 *   available hypervisor bandwidth.
 *
 * - If you send a packet to your own mac address, it will just be
 *   dropped, you won't get it on the receive side.
 *
 * - Multicast is implemented by sending the frame frame to every
 *   other partition.  It is the responsibility of the receiving
 *   partition to filter the addresses desired.
 *
 * Tunable parameters:
 *
 * VETH_NUMBUFFERS: This compile time option defaults to 120.  It
 * controls how much memory Linux will allocate per remote partition
 * it is communicating with.  It can be thought of as the maximum
 * number of packets outstanding to a remote partition at a time.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/ethtool.h>
#include <linux/if_ether.h>

#include <asm/abs_addr.h>
#include <asm/iseries/mf.h>
#include <asm/uaccess.h>
#include <asm/firmware.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iommu.h>
#include <asm/vio.h>

#undef DEBUG

MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
MODULE_LICENSE("GPL");

#define VETH_EVENT_CAP  (0)
#define VETH_EVENT_FRAMES     (1)
#define VETH_EVENT_MONITOR    (2)
#define VETH_EVENT_FRAMES_ACK (3)

#define VETH_MAX_ACKS_PER_MSG (20)
#define VETH_MAX_FRAMES_PER_MSG     (6)

struct veth_frames_data {
      u32 addr[VETH_MAX_FRAMES_PER_MSG];
      u16 len[VETH_MAX_FRAMES_PER_MSG];
      u32 eofmask;
};
#define VETH_EOF_SHIFT        (32-VETH_MAX_FRAMES_PER_MSG)

struct veth_frames_ack_data {
      u16 token[VETH_MAX_ACKS_PER_MSG];
};

struct veth_cap_data {
      u8 caps_version;
      u8 rsvd1;
      u16 num_buffers;
      u16 ack_threshold;
      u16 rsvd2;
      u32 ack_timeout;
      u32 rsvd3;
      u64 rsvd4[3];
};

struct veth_lpevent {
      struct HvLpEvent base_event;
      union {
            struct veth_cap_data caps_data;
            struct veth_frames_data frames_data;
            struct veth_frames_ack_data frames_ack_data;
      } u;

};

#define DRV_NAME  "iseries_veth"
#define DRV_VERSION     "2.0"

#define VETH_NUMBUFFERS       (120)
#define VETH_ACKTIMEOUT       (1000000) /* microseconds */
#define VETH_MAX_MCAST        (12)

#define VETH_MAX_MTU          (9000)

#if VETH_NUMBUFFERS < 10
#define ACK_THRESHOLD         (1)
#elif VETH_NUMBUFFERS < 20
#define ACK_THRESHOLD         (4)
#elif VETH_NUMBUFFERS < 40
#define ACK_THRESHOLD         (10)
#else
#define ACK_THRESHOLD         (20)
#endif

#define     VETH_STATE_SHUTDOWN     (0x0001)
#define VETH_STATE_OPEN       (0x0002)
#define VETH_STATE_RESET      (0x0004)
#define VETH_STATE_SENTMON    (0x0008)
#define VETH_STATE_SENTCAPS   (0x0010)
#define VETH_STATE_GOTCAPACK  (0x0020)
#define VETH_STATE_GOTCAPS    (0x0040)
#define VETH_STATE_SENTCAPACK (0x0080)
#define VETH_STATE_READY      (0x0100)

struct veth_msg {
      struct veth_msg *next;
      struct veth_frames_data data;
      int token;
      int in_use;
      struct sk_buff *skb;
      struct device *dev;
};

struct veth_lpar_connection {
      HvLpIndex remote_lp;
      struct delayed_work statemachine_wq;
      struct veth_msg *msgs;
      int num_events;
      struct veth_cap_data local_caps;

      struct kobject kobject;
      struct timer_list ack_timer;

      struct timer_list reset_timer;
      unsigned int reset_timeout;
      unsigned long last_contact;
      int outstanding_tx;

      spinlock_t lock;
      unsigned long state;
      HvLpInstanceId src_inst;
      HvLpInstanceId dst_inst;
      struct veth_lpevent cap_event, cap_ack_event;
      u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
      u32 num_pending_acks;

      int num_ack_events;
      struct veth_cap_data remote_caps;
      u32 ack_timeout;

      struct veth_msg *msg_stack_head;
};

struct veth_port {
      struct device *dev;
      u64 mac_addr;
      HvLpIndexMap lpar_map;

      /* queue_lock protects the stopped_map and dev's queue. */
      spinlock_t queue_lock;
      HvLpIndexMap stopped_map;

      /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
      rwlock_t mcast_gate;
      int promiscuous;
      int num_mcast;
      u64 mcast_addr[VETH_MAX_MCAST];

      struct kobject kobject;
};

static HvLpIndex this_lp;
static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */

static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
static void veth_wake_queues(struct veth_lpar_connection *cnx);
static void veth_stop_queues(struct veth_lpar_connection *cnx);
static void veth_receive(struct veth_lpar_connection *, struct veth_lpevent *);
static void veth_release_connection(struct kobject *kobject);
static void veth_timed_ack(unsigned long ptr);
static void veth_timed_reset(unsigned long ptr);

/*
 * Utility functions
 */

#define veth_info(fmt, args...) \
      printk(KERN_INFO DRV_NAME ": " fmt, ## args)

#define veth_error(fmt, args...) \
      printk(KERN_ERR DRV_NAME ": Error: " fmt, ## args)

#ifdef DEBUG
#define veth_debug(fmt, args...) \
      printk(KERN_DEBUG DRV_NAME ": " fmt, ## args)
#else
#define veth_debug(fmt, args...) do {} while (0)
#endif

/* You must hold the connection's lock when you call this function. */
static inline void veth_stack_push(struct veth_lpar_connection *cnx,
                           struct veth_msg *msg)
{
      msg->next = cnx->msg_stack_head;
      cnx->msg_stack_head = msg;
}

/* You must hold the connection's lock when you call this function. */
static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
{
      struct veth_msg *msg;

      msg = cnx->msg_stack_head;
      if (msg)
            cnx->msg_stack_head = cnx->msg_stack_head->next;

      return msg;
}

/* You must hold the connection's lock when you call this function. */
static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
{
      return cnx->msg_stack_head == NULL;
}

static inline HvLpEvent_Rc
veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
             HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
             u64 token,
             u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
{
      return HvCallEvent_signalLpEventFast(cnx->remote_lp,
                                   HvLpEvent_Type_VirtualLan,
                                   subtype, ackind, acktype,
                                   cnx->src_inst,
                                   cnx->dst_inst,
                                   token, data1, data2, data3,
                                   data4, data5);
}

static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
                                 u16 subtype, u64 token, void *data)
{
      u64 *p = (u64 *) data;

      return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
                        HvLpEvent_AckType_ImmediateAck,
                        token, p[0], p[1], p[2], p[3], p[4]);
}

struct veth_allocation {
      struct completion c;
      int num;
};

static void veth_complete_allocation(void *parm, int number)
{
      struct veth_allocation *vc = (struct veth_allocation *)parm;

      vc->num = number;
      complete(&vc->c);
}

static int veth_allocate_events(HvLpIndex rlp, int number)
{
      struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };

      mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
                      sizeof(struct veth_lpevent), number,
                      &veth_complete_allocation, &vc);
      wait_for_completion(&vc.c);

      return vc.num;
}

/*
 * sysfs support
 */

struct veth_cnx_attribute {
      struct attribute attr;
      ssize_t (*show)(struct veth_lpar_connection *, char *buf);
      ssize_t (*store)(struct veth_lpar_connection *, const char *buf);
};

static ssize_t veth_cnx_attribute_show(struct kobject *kobj,
            struct attribute *attr, char *buf)
{
      struct veth_cnx_attribute *cnx_attr;
      struct veth_lpar_connection *cnx;

      cnx_attr = container_of(attr, struct veth_cnx_attribute, attr);
      cnx = container_of(kobj, struct veth_lpar_connection, kobject);

      if (!cnx_attr->show)
            return -EIO;

      return cnx_attr->show(cnx, buf);
}

#define CUSTOM_CNX_ATTR(_name, _format, _expression)              \
static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\
{                                                     \
      return sprintf(buf, _format, _expression);                  \
}                                                     \
struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name)

#define SIMPLE_CNX_ATTR(_name)      \
      CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name)

SIMPLE_CNX_ATTR(outstanding_tx);
SIMPLE_CNX_ATTR(remote_lp);
SIMPLE_CNX_ATTR(num_events);
SIMPLE_CNX_ATTR(src_inst);
SIMPLE_CNX_ATTR(dst_inst);
SIMPLE_CNX_ATTR(num_pending_acks);
SIMPLE_CNX_ATTR(num_ack_events);
CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout));
CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout));
CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state);
CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ?
            jiffies_to_msecs(jiffies - cnx->last_contact) : 0);

#define GET_CNX_ATTR(_name)   (&veth_cnx_attr_##_name.attr)

static struct attribute *veth_cnx_default_attrs[] = {
      GET_CNX_ATTR(outstanding_tx),
      GET_CNX_ATTR(remote_lp),
      GET_CNX_ATTR(num_events),
      GET_CNX_ATTR(reset_timeout),
      GET_CNX_ATTR(last_contact),
      GET_CNX_ATTR(state),
      GET_CNX_ATTR(src_inst),
      GET_CNX_ATTR(dst_inst),
      GET_CNX_ATTR(num_pending_acks),
      GET_CNX_ATTR(num_ack_events),
      GET_CNX_ATTR(ack_timeout),
      NULL
};

static struct sysfs_ops veth_cnx_sysfs_ops = {
            .show = veth_cnx_attribute_show
};

static struct kobj_type veth_lpar_connection_ktype = {
      .release    = veth_release_connection,
      .sysfs_ops  = &veth_cnx_sysfs_ops,
      .default_attrs    = veth_cnx_default_attrs
};

struct veth_port_attribute {
      struct attribute attr;
      ssize_t (*show)(struct veth_port *, char *buf);
      ssize_t (*store)(struct veth_port *, const char *buf);
};

static ssize_t veth_port_attribute_show(struct kobject *kobj,
            struct attribute *attr, char *buf)
{
      struct veth_port_attribute *port_attr;
      struct veth_port *port;

      port_attr = container_of(attr, struct veth_port_attribute, attr);
      port = container_of(kobj, struct veth_port, kobject);

      if (!port_attr->show)
            return -EIO;

      return port_attr->show(port, buf);
}

#define CUSTOM_PORT_ATTR(_name, _format, _expression)             \
static ssize_t _name##_show(struct veth_port *port, char *buf)          \
{                                                     \
      return sprintf(buf, _format, _expression);                  \
}                                                     \
struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name)

#define SIMPLE_PORT_ATTR(_name)     \
      CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name)

SIMPLE_PORT_ATTR(promiscuous);
SIMPLE_PORT_ATTR(num_mcast);
CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map);
CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map);
CUSTOM_PORT_ATTR(mac_addr, "0x%lX\n", port->mac_addr);

#define GET_PORT_ATTR(_name)  (&veth_port_attr_##_name.attr)
static struct attribute *veth_port_default_attrs[] = {
      GET_PORT_ATTR(mac_addr),
      GET_PORT_ATTR(lpar_map),
      GET_PORT_ATTR(stopped_map),
      GET_PORT_ATTR(promiscuous),
      GET_PORT_ATTR(num_mcast),
      NULL
};

static struct sysfs_ops veth_port_sysfs_ops = {
      .show = veth_port_attribute_show
};

static struct kobj_type veth_port_ktype = {
      .sysfs_ops  = &veth_port_sysfs_ops,
      .default_attrs    = veth_port_default_attrs
};

/*
 * LPAR connection code
 */

static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
{
      schedule_delayed_work(&cnx->statemachine_wq, 0);
}

static void veth_take_cap(struct veth_lpar_connection *cnx,
                    struct veth_lpevent *event)
{
      unsigned long flags;

      spin_lock_irqsave(&cnx->lock, flags);
      /* Receiving caps may mean the other end has just come up, so
       * we need to reload the instance ID of the far end */
      cnx->dst_inst =
            HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
                                      HvLpEvent_Type_VirtualLan);

      if (cnx->state & VETH_STATE_GOTCAPS) {
            veth_error("Received a second capabilities from LPAR %d.\n",
                     cnx->remote_lp);
            event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
            HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
      } else {
            memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
            cnx->state |= VETH_STATE_GOTCAPS;
            veth_kick_statemachine(cnx);
      }
      spin_unlock_irqrestore(&cnx->lock, flags);
}

static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
                        struct veth_lpevent *event)
{
      unsigned long flags;

      spin_lock_irqsave(&cnx->lock, flags);
      if (cnx->state & VETH_STATE_GOTCAPACK) {
            veth_error("Received a second capabilities ack from LPAR %d.\n",
                     cnx->remote_lp);
      } else {
            memcpy(&cnx->cap_ack_event, event,
                   sizeof(&cnx->cap_ack_event));
            cnx->state |= VETH_STATE_GOTCAPACK;
            veth_kick_statemachine(cnx);
      }
      spin_unlock_irqrestore(&cnx->lock, flags);
}

static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
                          struct veth_lpevent *event)
{
      unsigned long flags;

      spin_lock_irqsave(&cnx->lock, flags);
      veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);

      /* Avoid kicking the statemachine once we're shutdown.
       * It's unnecessary and it could break veth_stop_connection(). */

      if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
            cnx->state |= VETH_STATE_RESET;
            veth_kick_statemachine(cnx);
      }
      spin_unlock_irqrestore(&cnx->lock, flags);
}

static void veth_handle_ack(struct veth_lpevent *event)
{
      HvLpIndex rlp = event->base_event.xTargetLp;
      struct veth_lpar_connection *cnx = veth_cnx[rlp];

      BUG_ON(! cnx);

      switch (event->base_event.xSubtype) {
      case VETH_EVENT_CAP:
            veth_take_cap_ack(cnx, event);
            break;
      case VETH_EVENT_MONITOR:
            veth_take_monitor_ack(cnx, event);
            break;
      default:
            veth_error("Unknown ack type %d from LPAR %d.\n",
                        event->base_event.xSubtype, rlp);
      };
}

static void veth_handle_int(struct veth_lpevent *event)
{
      HvLpIndex rlp = event->base_event.xSourceLp;
      struct veth_lpar_connection *cnx = veth_cnx[rlp];
      unsigned long flags;
      int i, acked = 0;

      BUG_ON(! cnx);

      switch (event->base_event.xSubtype) {
      case VETH_EVENT_CAP:
            veth_take_cap(cnx, event);
            break;
      case VETH_EVENT_MONITOR:
            /* do nothing... this'll hang out here til we're dead,
             * and the hypervisor will return it for us. */
            break;
      case VETH_EVENT_FRAMES_ACK:
            spin_lock_irqsave(&cnx->lock, flags);

            for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
                  u16 msgnum = event->u.frames_ack_data.token[i];

                  if (msgnum < VETH_NUMBUFFERS) {
                        veth_recycle_msg(cnx, cnx->msgs + msgnum);
                        cnx->outstanding_tx--;
                        acked++;
                  }
            }

            if (acked > 0) {
                  cnx->last_contact = jiffies;
                  veth_wake_queues(cnx);
            }

            spin_unlock_irqrestore(&cnx->lock, flags);
            break;
      case VETH_EVENT_FRAMES:
            veth_receive(cnx, event);
            break;
      default:
            veth_error("Unknown interrupt type %d from LPAR %d.\n",
                        event->base_event.xSubtype, rlp);
      };
}

static void veth_handle_event(struct HvLpEvent *event)
{
      struct veth_lpevent *veth_event = (struct veth_lpevent *)event;

      if (hvlpevent_is_ack(event))
            veth_handle_ack(veth_event);
      else
            veth_handle_int(veth_event);
}

static int veth_process_caps(struct veth_lpar_connection *cnx)
{
      struct veth_cap_data *remote_caps = &cnx->remote_caps;
      int num_acks_needed;

      /* Convert timer to jiffies */
      cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;

      if ( (remote_caps->num_buffers == 0)
           || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
           || (remote_caps->ack_threshold == 0)
           || (cnx->ack_timeout == 0) ) {
            veth_error("Received incompatible capabilities from LPAR %d.\n",
                        cnx->remote_lp);
            return HvLpEvent_Rc_InvalidSubtypeData;
      }

      num_acks_needed = (remote_caps->num_buffers
                     / remote_caps->ack_threshold) + 1;

      /* FIXME: locking on num_ack_events? */
      if (cnx->num_ack_events < num_acks_needed) {
            int num;

            num = veth_allocate_events(cnx->remote_lp,
                                 num_acks_needed-cnx->num_ack_events);
            if (num > 0)
                  cnx->num_ack_events += num;

            if (cnx->num_ack_events < num_acks_needed) {
                  veth_error("Couldn't allocate enough ack events "
                              "for LPAR %d.\n", cnx->remote_lp);

                  return HvLpEvent_Rc_BufferNotAvailable;
            }
      }


      return HvLpEvent_Rc_Good;
}

/* FIXME: The gotos here are a bit dubious */
static void veth_statemachine(struct work_struct *work)
{
      struct veth_lpar_connection *cnx =
            container_of(work, struct veth_lpar_connection,
                       statemachine_wq.work);
      int rlp = cnx->remote_lp;
      int rc;

      spin_lock_irq(&cnx->lock);

 restart:
      if (cnx->state & VETH_STATE_RESET) {
            if (cnx->state & VETH_STATE_OPEN)
                  HvCallEvent_closeLpEventPath(cnx->remote_lp,
                                         HvLpEvent_Type_VirtualLan);

            /*
             * Reset ack data. This prevents the ack_timer actually
             * doing anything, even if it runs one more time when
             * we drop the lock below.
             */
            memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
            cnx->num_pending_acks = 0;

            cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
                        | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
                        | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
                        | VETH_STATE_SENTCAPACK | VETH_STATE_READY);

            /* Clean up any leftover messages */
            if (cnx->msgs) {
                  int i;
                  for (i = 0; i < VETH_NUMBUFFERS; ++i)
                        veth_recycle_msg(cnx, cnx->msgs + i);
            }

            cnx->outstanding_tx = 0;
            veth_wake_queues(cnx);

            /* Drop the lock so we can do stuff that might sleep or
             * take other locks. */
            spin_unlock_irq(&cnx->lock);

            del_timer_sync(&cnx->ack_timer);
            del_timer_sync(&cnx->reset_timer);

            spin_lock_irq(&cnx->lock);

            if (cnx->state & VETH_STATE_RESET)
                  goto restart;

            /* Hack, wait for the other end to reset itself. */
            if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
                  schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
                  goto out;
            }
      }

      if (cnx->state & VETH_STATE_SHUTDOWN)
            /* It's all over, do nothing */
            goto out;

      if ( !(cnx->state & VETH_STATE_OPEN) ) {
            if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
                  goto cant_cope;

            HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
            cnx->src_inst =
                  HvCallEvent_getSourceLpInstanceId(rlp,
                                            HvLpEvent_Type_VirtualLan);
            cnx->dst_inst =
                  HvCallEvent_getTargetLpInstanceId(rlp,
                                            HvLpEvent_Type_VirtualLan);
            cnx->state |= VETH_STATE_OPEN;
      }

      if ( (cnx->state & VETH_STATE_OPEN)
           && !(cnx->state & VETH_STATE_SENTMON) ) {
            rc = veth_signalevent(cnx, VETH_EVENT_MONITOR,
                              HvLpEvent_AckInd_DoAck,
                              HvLpEvent_AckType_DeferredAck,
                              0, 0, 0, 0, 0, 0);

            if (rc == HvLpEvent_Rc_Good) {
                  cnx->state |= VETH_STATE_SENTMON;
            } else {
                  if ( (rc != HvLpEvent_Rc_PartitionDead)
                       && (rc != HvLpEvent_Rc_PathClosed) )
                        veth_error("Error sending monitor to LPAR %d, "
                                    "rc = %d\n", rlp, rc);

                  /* Oh well, hope we get a cap from the other
                   * end and do better when that kicks us */
                  goto out;
            }
      }

      if ( (cnx->state & VETH_STATE_OPEN)
           && !(cnx->state & VETH_STATE_SENTCAPS)) {
            u64 *rawcap = (u64 *)&cnx->local_caps;

            rc = veth_signalevent(cnx, VETH_EVENT_CAP,
                              HvLpEvent_AckInd_DoAck,
                              HvLpEvent_AckType_ImmediateAck,
                              0, rawcap[0], rawcap[1], rawcap[2],
                              rawcap[3], rawcap[4]);

            if (rc == HvLpEvent_Rc_Good) {
                  cnx->state |= VETH_STATE_SENTCAPS;
            } else {
                  if ( (rc != HvLpEvent_Rc_PartitionDead)
                       && (rc != HvLpEvent_Rc_PathClosed) )
                        veth_error("Error sending caps to LPAR %d, "
                                    "rc = %d\n", rlp, rc);

                  /* Oh well, hope we get a cap from the other
                   * end and do better when that kicks us */
                  goto out;
            }
      }

      if ((cnx->state & VETH_STATE_GOTCAPS)
          && !(cnx->state & VETH_STATE_SENTCAPACK)) {
            struct veth_cap_data *remote_caps = &cnx->remote_caps;

            memcpy(remote_caps, &cnx->cap_event.u.caps_data,
                   sizeof(*remote_caps));

            spin_unlock_irq(&cnx->lock);
            rc = veth_process_caps(cnx);
            spin_lock_irq(&cnx->lock);

            /* We dropped the lock, so recheck for anything which
             * might mess us up */
            if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
                  goto restart;

            cnx->cap_event.base_event.xRc = rc;
            HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
            if (rc == HvLpEvent_Rc_Good)
                  cnx->state |= VETH_STATE_SENTCAPACK;
            else
                  goto cant_cope;
      }

      if ((cnx->state & VETH_STATE_GOTCAPACK)
          && (cnx->state & VETH_STATE_GOTCAPS)
          && !(cnx->state & VETH_STATE_READY)) {
            if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
                  /* Start the ACK timer */
                  cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
                  add_timer(&cnx->ack_timer);
                  cnx->state |= VETH_STATE_READY;
            } else {
                  veth_error("Caps rejected by LPAR %d, rc = %d\n",
                              rlp, cnx->cap_ack_event.base_event.xRc);
                  goto cant_cope;
            }
      }

 out:
      spin_unlock_irq(&cnx->lock);
      return;

 cant_cope:
      /* FIXME: we get here if something happens we really can't
       * cope with.  The link will never work once we get here, and
       * all we can do is not lock the rest of the system up */
      veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
                  " (state = 0x%04lx)\n", rlp, cnx->state);
      cnx->state |= VETH_STATE_SHUTDOWN;
      spin_unlock_irq(&cnx->lock);
}

static int veth_init_connection(u8 rlp)
{
      struct veth_lpar_connection *cnx;
      struct veth_msg *msgs;
      int i, rc;

      if ( (rlp == this_lp)
           || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
            return 0;

      cnx = kzalloc(sizeof(*cnx), GFP_KERNEL);
      if (! cnx)
            return -ENOMEM;

      cnx->remote_lp = rlp;
      spin_lock_init(&cnx->lock);
      INIT_DELAYED_WORK(&cnx->statemachine_wq, veth_statemachine);

      init_timer(&cnx->ack_timer);
      cnx->ack_timer.function = veth_timed_ack;
      cnx->ack_timer.data = (unsigned long) cnx;

      init_timer(&cnx->reset_timer);
      cnx->reset_timer.function = veth_timed_reset;
      cnx->reset_timer.data = (unsigned long) cnx;
      cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);

      memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));

      veth_cnx[rlp] = cnx;

      /* This gets us 1 reference, which is held on behalf of the driver
       * infrastructure. It's released at module unload. */
      kobject_init(&cnx->kobject);
      cnx->kobject.ktype = &veth_lpar_connection_ktype;
      rc = kobject_set_name(&cnx->kobject, "cnx%.2d", rlp);
      if (rc != 0)
            return rc;

      msgs = kcalloc(VETH_NUMBUFFERS, sizeof(struct veth_msg), GFP_KERNEL);
      if (! msgs) {
            veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
            return -ENOMEM;
      }

      cnx->msgs = msgs;

      for (i = 0; i < VETH_NUMBUFFERS; i++) {
            msgs[i].token = i;
            veth_stack_push(cnx, msgs + i);
      }

      cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);

      if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
            veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
            return -ENOMEM;
      }

      cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
      cnx->local_caps.ack_threshold = ACK_THRESHOLD;
      cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;

      return 0;
}

static void veth_stop_connection(struct veth_lpar_connection *cnx)
{
      if (!cnx)
            return;

      spin_lock_irq(&cnx->lock);
      cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
      veth_kick_statemachine(cnx);
      spin_unlock_irq(&cnx->lock);

      /* There's a slim chance the reset code has just queued the
       * statemachine to run in five seconds. If so we need to cancel
       * that and requeue the work to run now. */
      if (cancel_delayed_work(&cnx->statemachine_wq)) {
            spin_lock_irq(&cnx->lock);
            veth_kick_statemachine(cnx);
            spin_unlock_irq(&cnx->lock);
      }

      /* Wait for the state machine to run. */
      flush_scheduled_work();
}

static void veth_destroy_connection(struct veth_lpar_connection *cnx)
{
      if (!cnx)
            return;

      if (cnx->num_events > 0)
            mf_deallocate_lp_events(cnx->remote_lp,
                              HvLpEvent_Type_VirtualLan,
                              cnx->num_events,
                              NULL, NULL);
      if (cnx->num_ack_events > 0)
            mf_deallocate_lp_events(cnx->remote_lp,
                              HvLpEvent_Type_VirtualLan,
                              cnx->num_ack_events,
                              NULL, NULL);

      kfree(cnx->msgs);
      veth_cnx[cnx->remote_lp] = NULL;
      kfree(cnx);
}

static void veth_release_connection(struct kobject *kobj)
{
      struct veth_lpar_connection *cnx;
      cnx = container_of(kobj, struct veth_lpar_connection, kobject);
      veth_stop_connection(cnx);
      veth_destroy_connection(cnx);
}

/*
 * net_device code
 */

static int veth_open(struct net_device *dev)
{
      netif_start_queue(dev);
      return 0;
}

static int veth_close(struct net_device *dev)
{
      netif_stop_queue(dev);
      return 0;
}

static int veth_change_mtu(struct net_device *dev, int new_mtu)
{
      if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
            return -EINVAL;
      dev->mtu = new_mtu;
      return 0;
}

static void veth_set_multicast_list(struct net_device *dev)
{
      struct veth_port *port = (struct veth_port *) dev->priv;
      unsigned long flags;

      write_lock_irqsave(&port->mcast_gate, flags);

      if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
                  (dev->mc_count > VETH_MAX_MCAST)) {
            port->promiscuous = 1;
      } else {
            struct dev_mc_list *dmi = dev->mc_list;
            int i;

            port->promiscuous = 0;

            /* Update table */
            port->num_mcast = 0;

            for (i = 0; i < dev->mc_count; i++) {
                  u8 *addr = dmi->dmi_addr;
                  u64 xaddr = 0;

                  if (addr[0] & 0x01) {/* multicast address? */
                        memcpy(&xaddr, addr, ETH_ALEN);
                        port->mcast_addr[port->num_mcast] = xaddr;
                        port->num_mcast++;
                  }
                  dmi = dmi->next;
            }
      }

      write_unlock_irqrestore(&port->mcast_gate, flags);
}

static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
      strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
      info->driver[sizeof(info->driver) - 1] = '\0';
      strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
      info->version[sizeof(info->version) - 1] = '\0';
}

static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
      ecmd->supported = (SUPPORTED_1000baseT_Full
                    | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
      ecmd->advertising = (SUPPORTED_1000baseT_Full
                      | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
      ecmd->port = PORT_FIBRE;
      ecmd->transceiver = XCVR_INTERNAL;
      ecmd->phy_address = 0;
      ecmd->speed = SPEED_1000;
      ecmd->duplex = DUPLEX_FULL;
      ecmd->autoneg = AUTONEG_ENABLE;
      ecmd->maxtxpkt = 120;
      ecmd->maxrxpkt = 120;
      return 0;
}

static u32 veth_get_link(struct net_device *dev)
{
      return 1;
}

static const struct ethtool_ops ops = {
      .get_drvinfo = veth_get_drvinfo,
      .get_settings = veth_get_settings,
      .get_link = veth_get_link,
};

static struct net_device * __init veth_probe_one(int vlan,
            struct vio_dev *vio_dev)
{
      struct net_device *dev;
      struct veth_port *port;
      struct device *vdev = &vio_dev->dev;
      int i, rc;
      const unsigned char *mac_addr;

      mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
      if (mac_addr == NULL)
            mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
      if (mac_addr == NULL) {
            veth_error("Unable to fetch MAC address from device tree.\n");
            return NULL;
      }

      dev = alloc_etherdev(sizeof (struct veth_port));
      if (! dev) {
            veth_error("Unable to allocate net_device structure!\n");
            return NULL;
      }

      port = (struct veth_port *) dev->priv;

      spin_lock_init(&port->queue_lock);
      rwlock_init(&port->mcast_gate);
      port->stopped_map = 0;

      for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
            HvLpVirtualLanIndexMap map;

            if (i == this_lp)
                  continue;
            map = HvLpConfig_getVirtualLanIndexMapForLp(i);
            if (map & (0x8000 >> vlan))
                  port->lpar_map |= (1 << i);
      }
      port->dev = vdev;

      memcpy(dev->dev_addr, mac_addr, ETH_ALEN);

      dev->mtu = VETH_MAX_MTU;

      memcpy(&port->mac_addr, mac_addr, ETH_ALEN);

      dev->open = veth_open;
      dev->hard_start_xmit = veth_start_xmit;
      dev->stop = veth_close;
      dev->change_mtu = veth_change_mtu;
      dev->set_mac_address = NULL;
      dev->set_multicast_list = veth_set_multicast_list;
      SET_ETHTOOL_OPS(dev, &ops);

      SET_NETDEV_DEV(dev, vdev);

      rc = register_netdev(dev);
      if (rc != 0) {
            veth_error("Failed registering net device for vlan%d.\n", vlan);
            free_netdev(dev);
            return NULL;
      }

      kobject_init(&port->kobject);
      port->kobject.parent = &dev->dev.kobj;
      port->kobject.ktype  = &veth_port_ktype;
      kobject_set_name(&port->kobject, "veth_port");
      if (0 != kobject_add(&port->kobject))
            veth_error("Failed adding port for %s to sysfs.\n", dev->name);

      veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
                  dev->name, vlan, port->lpar_map);

      return dev;
}

/*
 * Tx path
 */

static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
                        struct net_device *dev)
{
      struct veth_lpar_connection *cnx = veth_cnx[rlp];
      struct veth_port *port = (struct veth_port *) dev->priv;
      HvLpEvent_Rc rc;
      struct veth_msg *msg = NULL;
      unsigned long flags;

      if (! cnx)
            return 0;

      spin_lock_irqsave(&cnx->lock, flags);

      if (! (cnx->state & VETH_STATE_READY))
            goto no_error;

      if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
            goto drop;

      msg = veth_stack_pop(cnx);
      if (! msg)
            goto drop;

      msg->in_use = 1;
      msg->skb = skb_get(skb);

      msg->data.addr[0] = dma_map_single(port->dev, skb->data,
                        skb->len, DMA_TO_DEVICE);

      if (dma_mapping_error(msg->data.addr[0]))
            goto recycle_and_drop;

      msg->dev = port->dev;
      msg->data.len[0] = skb->len;
      msg->data.eofmask = 1 << VETH_EOF_SHIFT;

      rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);

      if (rc != HvLpEvent_Rc_Good)
            goto recycle_and_drop;

      /* If the timer's not already running, start it now. */
      if (0 == cnx->outstanding_tx)
            mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);

      cnx->last_contact = jiffies;
      cnx->outstanding_tx++;

      if (veth_stack_is_empty(cnx))
            veth_stop_queues(cnx);

 no_error:
      spin_unlock_irqrestore(&cnx->lock, flags);
      return 0;

 recycle_and_drop:
      veth_recycle_msg(cnx, msg);
 drop:
      spin_unlock_irqrestore(&cnx->lock, flags);
      return 1;
}

static void veth_transmit_to_many(struct sk_buff *skb,
                                HvLpIndexMap lpmask,
                                struct net_device *dev)
{
      int i, success, error;

      success = error = 0;

      for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
            if ((lpmask & (1 << i)) == 0)
                  continue;

            if (veth_transmit_to_one(skb, i, dev))
                  error = 1;
            else
                  success = 1;
      }

      if (error)
            dev->stats.tx_errors++;

      if (success) {
            dev->stats.tx_packets++;
            dev->stats.tx_bytes += skb->len;
      }
}

static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
      unsigned char *frame = skb->data;
      struct veth_port *port = (struct veth_port *) dev->priv;
      HvLpIndexMap lpmask;

      if (! (frame[0] & 0x01)) {
            /* unicast packet */
            HvLpIndex rlp = frame[5];

            if ( ! ((1 << rlp) & port->lpar_map) ) {
                  dev_kfree_skb(skb);
                  return 0;
            }

            lpmask = 1 << rlp;
      } else {
            lpmask = port->lpar_map;
      }

      veth_transmit_to_many(skb, lpmask, dev);

      dev_kfree_skb(skb);

      return 0;
}

/* You must hold the connection's lock when you call this function. */
static void veth_recycle_msg(struct veth_lpar_connection *cnx,
                       struct veth_msg *msg)
{
      u32 dma_address, dma_length;

      if (msg->in_use) {
            msg->in_use = 0;
            dma_address = msg->data.addr[0];
            dma_length = msg->data.len[0];

            if (!dma_mapping_error(dma_address))
                  dma_unmap_single(msg->dev, dma_address, dma_length,
                              DMA_TO_DEVICE);

            if (msg->skb) {
                  dev_kfree_skb_any(msg->skb);
                  msg->skb = NULL;
            }

            memset(&msg->data, 0, sizeof(msg->data));
            veth_stack_push(cnx, msg);
      } else if (cnx->state & VETH_STATE_OPEN) {
            veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
                        cnx->remote_lp, msg->token);
      }
}

static void veth_wake_queues(struct veth_lpar_connection *cnx)
{
      int i;

      for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
            struct net_device *dev = veth_dev[i];
            struct veth_port *port;
            unsigned long flags;

            if (! dev)
                  continue;

            port = (struct veth_port *)dev->priv;

            if (! (port->lpar_map & (1<<cnx->remote_lp)))
                  continue;

            spin_lock_irqsave(&port->queue_lock, flags);

            port->stopped_map &= ~(1 << cnx->remote_lp);

            if (0 == port->stopped_map && netif_queue_stopped(dev)) {
                  veth_debug("cnx %d: woke queue for %s.\n",
                              cnx->remote_lp, dev->name);
                  netif_wake_queue(dev);
            }
            spin_unlock_irqrestore(&port->queue_lock, flags);
      }
}

static void veth_stop_queues(struct veth_lpar_connection *cnx)
{
      int i;

      for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
            struct net_device *dev = veth_dev[i];
            struct veth_port *port;

            if (! dev)
                  continue;

            port = (struct veth_port *)dev->priv;

            /* If this cnx is not on the vlan for this port, continue */
            if (! (port->lpar_map & (1 << cnx->remote_lp)))
                  continue;

            spin_lock(&port->queue_lock);

            netif_stop_queue(dev);
            port->stopped_map |= (1 << cnx->remote_lp);

            veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
                        cnx->remote_lp, dev->name, port->stopped_map);

            spin_unlock(&port->queue_lock);
      }
}

static void veth_timed_reset(unsigned long ptr)
{
      struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
      unsigned long trigger_time, flags;

      /* FIXME is it possible this fires after veth_stop_connection()?
       * That would reschedule the statemachine for 5 seconds and probably
       * execute it after the module's been unloaded. Hmm. */

      spin_lock_irqsave(&cnx->lock, flags);

      if (cnx->outstanding_tx > 0) {
            trigger_time = cnx->last_contact + cnx->reset_timeout;

            if (trigger_time < jiffies) {
                  cnx->state |= VETH_STATE_RESET;
                  veth_kick_statemachine(cnx);
                  veth_error("%d packets not acked by LPAR %d within %d "
                              "seconds, resetting.\n",
                              cnx->outstanding_tx, cnx->remote_lp,
                              cnx->reset_timeout / HZ);
            } else {
                  /* Reschedule the timer */
                  trigger_time = jiffies + cnx->reset_timeout;
                  mod_timer(&cnx->reset_timer, trigger_time);
            }
      }

      spin_unlock_irqrestore(&cnx->lock, flags);
}

/*
 * Rx path
 */

static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
{
      int wanted = 0;
      int i;
      unsigned long flags;

      if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
            return 1;

      read_lock_irqsave(&port->mcast_gate, flags);

      if (port->promiscuous) {
            wanted = 1;
            goto out;
      }

      for (i = 0; i < port->num_mcast; ++i) {
            if (port->mcast_addr[i] == mac_addr) {
                  wanted = 1;
                  break;
            }
      }

 out:
      read_unlock_irqrestore(&port->mcast_gate, flags);

      return wanted;
}

struct dma_chunk {
      u64 addr;
      u64 size;
};

#define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )

static inline void veth_build_dma_list(struct dma_chunk *list,
                               unsigned char *p, unsigned long length)
{
      unsigned long done;
      int i = 1;

      /* FIXME: skbs are continguous in real addresses.  Do we
       * really need to break it into PAGE_SIZE chunks, or can we do
       * it just at the granularity of iSeries real->absolute
       * mapping?  Indeed, given the way the allocator works, can we
       * count on them being absolutely contiguous? */
      list[0].addr = iseries_hv_addr(p);
      list[0].size = min(length,
                     PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));

      done = list[0].size;
      while (done < length) {
            list[i].addr = iseries_hv_addr(p + done);
            list[i].size = min(length-done, PAGE_SIZE);
            done += list[i].size;
            i++;
      }
}

static void veth_flush_acks(struct veth_lpar_connection *cnx)
{
      HvLpEvent_Rc rc;

      rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
                       0, &cnx->pending_acks);

      if (rc != HvLpEvent_Rc_Good)
            veth_error("Failed acking frames from LPAR %d, rc = %d\n",
                        cnx->remote_lp, (int)rc);

      cnx->num_pending_acks = 0;
      memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
}

static void veth_receive(struct veth_lpar_connection *cnx,
                   struct veth_lpevent *event)
{
      struct veth_frames_data *senddata = &event->u.frames_data;
      int startchunk = 0;
      int nchunks;
      unsigned long flags;
      HvLpDma_Rc rc;

      do {
            u16 length = 0;
            struct sk_buff *skb;
            struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
            struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
            u64 dest;
            HvLpVirtualLanIndex vlan;
            struct net_device *dev;
            struct veth_port *port;

            /* FIXME: do we need this? */
            memset(local_list, 0, sizeof(local_list));
            memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));

            /* a 0 address marks the end of the valid entries */
            if (senddata->addr[startchunk] == 0)
                  break;

            /* make sure that we have at least 1 EOF entry in the
             * remaining entries */
            if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
                  veth_error("Missing EOF fragment in event "
                              "eofmask = 0x%x startchunk = %d\n",
                              (unsigned)senddata->eofmask,
                              startchunk);
                  break;
            }

            /* build list of chunks in this frame */
            nchunks = 0;
            do {
                  remote_list[nchunks].addr =
                        (u64) senddata->addr[startchunk+nchunks] << 32;
                  remote_list[nchunks].size =
                        senddata->len[startchunk+nchunks];
                  length += remote_list[nchunks].size;
            } while (! (senddata->eofmask &
                      (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));

            /* length == total length of all chunks */
            /* nchunks == # of chunks in this frame */

            if ((length - ETH_HLEN) > VETH_MAX_MTU) {
                  veth_error("Received oversize frame from LPAR %d "
                              "(length = %d)\n",
                              cnx->remote_lp, length);
                  continue;
            }

            skb = alloc_skb(length, GFP_ATOMIC);
            if (!skb)
                  continue;

            veth_build_dma_list(local_list, skb->data, length);

            rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
                                  event->base_event.xSourceLp,
                                  HvLpDma_Direction_RemoteToLocal,
                                  cnx->src_inst,
                                  cnx->dst_inst,
                                  HvLpDma_AddressType_RealAddress,
                                  HvLpDma_AddressType_TceIndex,
                                  iseries_hv_addr(&local_list),
                                  iseries_hv_addr(&remote_list),
                                  length);
            if (rc != HvLpDma_Rc_Good) {
                  dev_kfree_skb_irq(skb);
                  continue;
            }

            vlan = skb->data[9];
            dev = veth_dev[vlan];
            if (! dev) {
                  /*
                   * Some earlier versions of the driver sent
                   * broadcasts down all connections, even to lpars
                   * that weren't on the relevant vlan. So ignore
                   * packets belonging to a vlan we're not on.
                   * We can also be here if we receive packets while
                   * the driver is going down, because then dev is NULL.
                   */
                  dev_kfree_skb_irq(skb);
                  continue;
            }

            port = (struct veth_port *)dev->priv;
            dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;

            if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
                  dev_kfree_skb_irq(skb);
                  continue;
            }
            if (! veth_frame_wanted(port, dest)) {
                  dev_kfree_skb_irq(skb);
                  continue;
            }

            skb_put(skb, length);
            skb->protocol = eth_type_trans(skb, dev);
            skb->ip_summed = CHECKSUM_NONE;
            netif_rx(skb);    /* send it up */
            dev->stats.rx_packets++;
            dev->stats.rx_bytes += length;
      } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);

      /* Ack it */
      spin_lock_irqsave(&cnx->lock, flags);
      BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);

      cnx->pending_acks[cnx->num_pending_acks++] =
            event->base_event.xCorrelationToken;

      if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
           || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
            veth_flush_acks(cnx);

      spin_unlock_irqrestore(&cnx->lock, flags);
}

static void veth_timed_ack(unsigned long ptr)
{
      struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
      unsigned long flags;

      /* Ack all the events */
      spin_lock_irqsave(&cnx->lock, flags);
      if (cnx->num_pending_acks > 0)
            veth_flush_acks(cnx);

      /* Reschedule the timer */
      cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
      add_timer(&cnx->ack_timer);
      spin_unlock_irqrestore(&cnx->lock, flags);
}

static int veth_remove(struct vio_dev *vdev)
{
      struct veth_lpar_connection *cnx;
      struct net_device *dev;
      struct veth_port *port;
      int i;

      dev = veth_dev[vdev->unit_address];

      if (! dev)
            return 0;

      port = netdev_priv(dev);

      for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
            cnx = veth_cnx[i];

            if (cnx && (port->lpar_map & (1 << i))) {
                  /* Drop our reference to connections on our VLAN */
                  kobject_put(&cnx->kobject);
            }
      }

      veth_dev[vdev->unit_address] = NULL;
      kobject_del(&port->kobject);
      kobject_put(&port->kobject);
      unregister_netdev(dev);
      free_netdev(dev);

      return 0;
}

static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
      int i = vdev->unit_address;
      struct net_device *dev;
      struct veth_port *port;

      dev = veth_probe_one(i, vdev);
      if (dev == NULL) {
            veth_remove(vdev);
            return 1;
      }
      veth_dev[i] = dev;

      port = (struct veth_port*)netdev_priv(dev);

      /* Start the state machine on each connection on this vlan. If we're
       * the first dev to do so this will commence link negotiation */
      for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
            struct veth_lpar_connection *cnx;

            if (! (port->lpar_map & (1 << i)))
                  continue;

            cnx = veth_cnx[i];
            if (!cnx)
                  continue;

            kobject_get(&cnx->kobject);
            veth_kick_statemachine(cnx);
      }

      return 0;
}

/**
 * veth_device_table: Used by vio.c to match devices that we
 * support.
 */
static struct vio_device_id veth_device_table[] __devinitdata = {
      { "network", "IBM,iSeries-l-lan" },
      { "", "" }
};
MODULE_DEVICE_TABLE(vio, veth_device_table);

static struct vio_driver veth_driver = {
      .id_table = veth_device_table,
      .probe = veth_probe,
      .remove = veth_remove,
      .driver = {
            .name = DRV_NAME,
            .owner = THIS_MODULE,
      }
};

/*
 * Module initialization/cleanup
 */

static void __exit veth_module_cleanup(void)
{
      int i;
      struct veth_lpar_connection *cnx;

      /* Disconnect our "irq" to stop events coming from the Hypervisor. */
      HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);

      /* Make sure any work queued from Hypervisor callbacks is finished. */
      flush_scheduled_work();

      for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
            cnx = veth_cnx[i];

            if (!cnx)
                  continue;

            /* Remove the connection from sysfs */
            kobject_del(&cnx->kobject);
            /* Drop the driver's reference to the connection */
            kobject_put(&cnx->kobject);
      }

      /* Unregister the driver, which will close all the netdevs and stop
       * the connections when they're no longer referenced. */
      vio_unregister_driver(&veth_driver);
}
module_exit(veth_module_cleanup);

static int __init veth_module_init(void)
{
      int i;
      int rc;

      if (!firmware_has_feature(FW_FEATURE_ISERIES))
            return -ENODEV;

      this_lp = HvLpConfig_getLpIndex_outline();

      for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
            rc = veth_init_connection(i);
            if (rc != 0)
                  goto error;
      }

      HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
                          &veth_handle_event);

      rc = vio_register_driver(&veth_driver);
      if (rc != 0)
            goto error;

      for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
            struct kobject *kobj;

            if (!veth_cnx[i])
                  continue;

            kobj = &veth_cnx[i]->kobject;
            kobj->parent = &veth_driver.driver.kobj;
            /* If the add failes, complain but otherwise continue */
            if (0 != kobject_add(kobj))
                  veth_error("cnx %d: Failed adding to sysfs.\n", i);
      }

      return 0;

error:
      for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
            veth_destroy_connection(veth_cnx[i]);
      }

      return rc;
}
module_init(veth_module_init);

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