[NET] drivers/net: statistics cleanup #1 -- save memory and shrink code
[linux-2.6.git] / drivers / net / iseries_veth.c
1 /* File veth.c created by Kyle A. Lucke on Mon Aug  7 2000. */
2 /*
3  * IBM eServer iSeries Virtual Ethernet Device Driver
4  * Copyright (C) 2001 Kyle A. Lucke (klucke@us.ibm.com), IBM Corp.
5  * Substantially cleaned up by:
6  * Copyright (C) 2003 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
7  * Copyright (C) 2004-2005 Michael Ellerman, IBM Corporation.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License as
11  * published by the Free Software Foundation; either version 2 of the
12  * License, or (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22  * USA
23  *
24  *
25  * This module implements the virtual ethernet device for iSeries LPAR
26  * Linux.  It uses hypervisor message passing to implement an
27  * ethernet-like network device communicating between partitions on
28  * the iSeries.
29  *
30  * The iSeries LPAR hypervisor currently allows for up to 16 different
31  * virtual ethernets.  These are all dynamically configurable on
32  * OS/400 partitions, but dynamic configuration is not supported under
33  * Linux yet.  An ethXX network device will be created for each
34  * virtual ethernet this partition is connected to.
35  *
36  * - This driver is responsible for routing packets to and from other
37  *   partitions.  The MAC addresses used by the virtual ethernets
38  *   contains meaning and must not be modified.
39  *
40  * - Having 2 virtual ethernets to the same remote partition DOES NOT
41  *   double the available bandwidth.  The 2 devices will share the
42  *   available hypervisor bandwidth.
43  *
44  * - If you send a packet to your own mac address, it will just be
45  *   dropped, you won't get it on the receive side.
46  *
47  * - Multicast is implemented by sending the frame frame to every
48  *   other partition.  It is the responsibility of the receiving
49  *   partition to filter the addresses desired.
50  *
51  * Tunable parameters:
52  *
53  * VETH_NUMBUFFERS: This compile time option defaults to 120.  It
54  * controls how much memory Linux will allocate per remote partition
55  * it is communicating with.  It can be thought of as the maximum
56  * number of packets outstanding to a remote partition at a time.
57  */
58
59 #include <linux/module.h>
60 #include <linux/types.h>
61 #include <linux/errno.h>
62 #include <linux/ioport.h>
63 #include <linux/kernel.h>
64 #include <linux/netdevice.h>
65 #include <linux/etherdevice.h>
66 #include <linux/skbuff.h>
67 #include <linux/init.h>
68 #include <linux/delay.h>
69 #include <linux/mm.h>
70 #include <linux/ethtool.h>
71 #include <linux/if_ether.h>
72
73 #include <asm/abs_addr.h>
74 #include <asm/iseries/mf.h>
75 #include <asm/uaccess.h>
76 #include <asm/firmware.h>
77 #include <asm/iseries/hv_lp_config.h>
78 #include <asm/iseries/hv_types.h>
79 #include <asm/iseries/hv_lp_event.h>
80 #include <asm/iommu.h>
81 #include <asm/vio.h>
82
83 #undef DEBUG
84
85 MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
86 MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
87 MODULE_LICENSE("GPL");
88
89 #define VETH_EVENT_CAP  (0)
90 #define VETH_EVENT_FRAMES       (1)
91 #define VETH_EVENT_MONITOR      (2)
92 #define VETH_EVENT_FRAMES_ACK   (3)
93
94 #define VETH_MAX_ACKS_PER_MSG   (20)
95 #define VETH_MAX_FRAMES_PER_MSG (6)
96
97 struct veth_frames_data {
98         u32 addr[VETH_MAX_FRAMES_PER_MSG];
99         u16 len[VETH_MAX_FRAMES_PER_MSG];
100         u32 eofmask;
101 };
102 #define VETH_EOF_SHIFT          (32-VETH_MAX_FRAMES_PER_MSG)
103
104 struct veth_frames_ack_data {
105         u16 token[VETH_MAX_ACKS_PER_MSG];
106 };
107
108 struct veth_cap_data {
109         u8 caps_version;
110         u8 rsvd1;
111         u16 num_buffers;
112         u16 ack_threshold;
113         u16 rsvd2;
114         u32 ack_timeout;
115         u32 rsvd3;
116         u64 rsvd4[3];
117 };
118
119 struct veth_lpevent {
120         struct HvLpEvent base_event;
121         union {
122                 struct veth_cap_data caps_data;
123                 struct veth_frames_data frames_data;
124                 struct veth_frames_ack_data frames_ack_data;
125         } u;
126
127 };
128
129 #define DRV_NAME        "iseries_veth"
130 #define DRV_VERSION     "2.0"
131
132 #define VETH_NUMBUFFERS         (120)
133 #define VETH_ACKTIMEOUT         (1000000) /* microseconds */
134 #define VETH_MAX_MCAST          (12)
135
136 #define VETH_MAX_MTU            (9000)
137
138 #if VETH_NUMBUFFERS < 10
139 #define ACK_THRESHOLD           (1)
140 #elif VETH_NUMBUFFERS < 20
141 #define ACK_THRESHOLD           (4)
142 #elif VETH_NUMBUFFERS < 40
143 #define ACK_THRESHOLD           (10)
144 #else
145 #define ACK_THRESHOLD           (20)
146 #endif
147
148 #define VETH_STATE_SHUTDOWN     (0x0001)
149 #define VETH_STATE_OPEN         (0x0002)
150 #define VETH_STATE_RESET        (0x0004)
151 #define VETH_STATE_SENTMON      (0x0008)
152 #define VETH_STATE_SENTCAPS     (0x0010)
153 #define VETH_STATE_GOTCAPACK    (0x0020)
154 #define VETH_STATE_GOTCAPS      (0x0040)
155 #define VETH_STATE_SENTCAPACK   (0x0080)
156 #define VETH_STATE_READY        (0x0100)
157
158 struct veth_msg {
159         struct veth_msg *next;
160         struct veth_frames_data data;
161         int token;
162         int in_use;
163         struct sk_buff *skb;
164         struct device *dev;
165 };
166
167 struct veth_lpar_connection {
168         HvLpIndex remote_lp;
169         struct delayed_work statemachine_wq;
170         struct veth_msg *msgs;
171         int num_events;
172         struct veth_cap_data local_caps;
173
174         struct kobject kobject;
175         struct timer_list ack_timer;
176
177         struct timer_list reset_timer;
178         unsigned int reset_timeout;
179         unsigned long last_contact;
180         int outstanding_tx;
181
182         spinlock_t lock;
183         unsigned long state;
184         HvLpInstanceId src_inst;
185         HvLpInstanceId dst_inst;
186         struct veth_lpevent cap_event, cap_ack_event;
187         u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
188         u32 num_pending_acks;
189
190         int num_ack_events;
191         struct veth_cap_data remote_caps;
192         u32 ack_timeout;
193
194         struct veth_msg *msg_stack_head;
195 };
196
197 struct veth_port {
198         struct device *dev;
199         u64 mac_addr;
200         HvLpIndexMap lpar_map;
201
202         /* queue_lock protects the stopped_map and dev's queue. */
203         spinlock_t queue_lock;
204         HvLpIndexMap stopped_map;
205
206         /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
207         rwlock_t mcast_gate;
208         int promiscuous;
209         int num_mcast;
210         u64 mcast_addr[VETH_MAX_MCAST];
211
212         struct kobject kobject;
213 };
214
215 static HvLpIndex this_lp;
216 static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
217 static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
218
219 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
220 static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
221 static void veth_wake_queues(struct veth_lpar_connection *cnx);
222 static void veth_stop_queues(struct veth_lpar_connection *cnx);
223 static void veth_receive(struct veth_lpar_connection *, struct veth_lpevent *);
224 static void veth_release_connection(struct kobject *kobject);
225 static void veth_timed_ack(unsigned long ptr);
226 static void veth_timed_reset(unsigned long ptr);
227
228 /*
229  * Utility functions
230  */
231
232 #define veth_info(fmt, args...) \
233         printk(KERN_INFO DRV_NAME ": " fmt, ## args)
234
235 #define veth_error(fmt, args...) \
236         printk(KERN_ERR DRV_NAME ": Error: " fmt, ## args)
237
238 #ifdef DEBUG
239 #define veth_debug(fmt, args...) \
240         printk(KERN_DEBUG DRV_NAME ": " fmt, ## args)
241 #else
242 #define veth_debug(fmt, args...) do {} while (0)
243 #endif
244
245 /* You must hold the connection's lock when you call this function. */
246 static inline void veth_stack_push(struct veth_lpar_connection *cnx,
247                                    struct veth_msg *msg)
248 {
249         msg->next = cnx->msg_stack_head;
250         cnx->msg_stack_head = msg;
251 }
252
253 /* You must hold the connection's lock when you call this function. */
254 static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
255 {
256         struct veth_msg *msg;
257
258         msg = cnx->msg_stack_head;
259         if (msg)
260                 cnx->msg_stack_head = cnx->msg_stack_head->next;
261
262         return msg;
263 }
264
265 /* You must hold the connection's lock when you call this function. */
266 static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
267 {
268         return cnx->msg_stack_head == NULL;
269 }
270
271 static inline HvLpEvent_Rc
272 veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
273                  HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
274                  u64 token,
275                  u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
276 {
277         return HvCallEvent_signalLpEventFast(cnx->remote_lp,
278                                              HvLpEvent_Type_VirtualLan,
279                                              subtype, ackind, acktype,
280                                              cnx->src_inst,
281                                              cnx->dst_inst,
282                                              token, data1, data2, data3,
283                                              data4, data5);
284 }
285
286 static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
287                                            u16 subtype, u64 token, void *data)
288 {
289         u64 *p = (u64 *) data;
290
291         return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
292                                 HvLpEvent_AckType_ImmediateAck,
293                                 token, p[0], p[1], p[2], p[3], p[4]);
294 }
295
296 struct veth_allocation {
297         struct completion c;
298         int num;
299 };
300
301 static void veth_complete_allocation(void *parm, int number)
302 {
303         struct veth_allocation *vc = (struct veth_allocation *)parm;
304
305         vc->num = number;
306         complete(&vc->c);
307 }
308
309 static int veth_allocate_events(HvLpIndex rlp, int number)
310 {
311         struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
312
313         mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
314                             sizeof(struct veth_lpevent), number,
315                             &veth_complete_allocation, &vc);
316         wait_for_completion(&vc.c);
317
318         return vc.num;
319 }
320
321 /*
322  * sysfs support
323  */
324
325 struct veth_cnx_attribute {
326         struct attribute attr;
327         ssize_t (*show)(struct veth_lpar_connection *, char *buf);
328         ssize_t (*store)(struct veth_lpar_connection *, const char *buf);
329 };
330
331 static ssize_t veth_cnx_attribute_show(struct kobject *kobj,
332                 struct attribute *attr, char *buf)
333 {
334         struct veth_cnx_attribute *cnx_attr;
335         struct veth_lpar_connection *cnx;
336
337         cnx_attr = container_of(attr, struct veth_cnx_attribute, attr);
338         cnx = container_of(kobj, struct veth_lpar_connection, kobject);
339
340         if (!cnx_attr->show)
341                 return -EIO;
342
343         return cnx_attr->show(cnx, buf);
344 }
345
346 #define CUSTOM_CNX_ATTR(_name, _format, _expression)                    \
347 static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\
348 {                                                                       \
349         return sprintf(buf, _format, _expression);                      \
350 }                                                                       \
351 struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name)
352
353 #define SIMPLE_CNX_ATTR(_name)  \
354         CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name)
355
356 SIMPLE_CNX_ATTR(outstanding_tx);
357 SIMPLE_CNX_ATTR(remote_lp);
358 SIMPLE_CNX_ATTR(num_events);
359 SIMPLE_CNX_ATTR(src_inst);
360 SIMPLE_CNX_ATTR(dst_inst);
361 SIMPLE_CNX_ATTR(num_pending_acks);
362 SIMPLE_CNX_ATTR(num_ack_events);
363 CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout));
364 CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout));
365 CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state);
366 CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ?
367                 jiffies_to_msecs(jiffies - cnx->last_contact) : 0);
368
369 #define GET_CNX_ATTR(_name)     (&veth_cnx_attr_##_name.attr)
370
371 static struct attribute *veth_cnx_default_attrs[] = {
372         GET_CNX_ATTR(outstanding_tx),
373         GET_CNX_ATTR(remote_lp),
374         GET_CNX_ATTR(num_events),
375         GET_CNX_ATTR(reset_timeout),
376         GET_CNX_ATTR(last_contact),
377         GET_CNX_ATTR(state),
378         GET_CNX_ATTR(src_inst),
379         GET_CNX_ATTR(dst_inst),
380         GET_CNX_ATTR(num_pending_acks),
381         GET_CNX_ATTR(num_ack_events),
382         GET_CNX_ATTR(ack_timeout),
383         NULL
384 };
385
386 static struct sysfs_ops veth_cnx_sysfs_ops = {
387                 .show = veth_cnx_attribute_show
388 };
389
390 static struct kobj_type veth_lpar_connection_ktype = {
391         .release        = veth_release_connection,
392         .sysfs_ops      = &veth_cnx_sysfs_ops,
393         .default_attrs  = veth_cnx_default_attrs
394 };
395
396 struct veth_port_attribute {
397         struct attribute attr;
398         ssize_t (*show)(struct veth_port *, char *buf);
399         ssize_t (*store)(struct veth_port *, const char *buf);
400 };
401
402 static ssize_t veth_port_attribute_show(struct kobject *kobj,
403                 struct attribute *attr, char *buf)
404 {
405         struct veth_port_attribute *port_attr;
406         struct veth_port *port;
407
408         port_attr = container_of(attr, struct veth_port_attribute, attr);
409         port = container_of(kobj, struct veth_port, kobject);
410
411         if (!port_attr->show)
412                 return -EIO;
413
414         return port_attr->show(port, buf);
415 }
416
417 #define CUSTOM_PORT_ATTR(_name, _format, _expression)                   \
418 static ssize_t _name##_show(struct veth_port *port, char *buf)          \
419 {                                                                       \
420         return sprintf(buf, _format, _expression);                      \
421 }                                                                       \
422 struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name)
423
424 #define SIMPLE_PORT_ATTR(_name) \
425         CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name)
426
427 SIMPLE_PORT_ATTR(promiscuous);
428 SIMPLE_PORT_ATTR(num_mcast);
429 CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map);
430 CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map);
431 CUSTOM_PORT_ATTR(mac_addr, "0x%lX\n", port->mac_addr);
432
433 #define GET_PORT_ATTR(_name)    (&veth_port_attr_##_name.attr)
434 static struct attribute *veth_port_default_attrs[] = {
435         GET_PORT_ATTR(mac_addr),
436         GET_PORT_ATTR(lpar_map),
437         GET_PORT_ATTR(stopped_map),
438         GET_PORT_ATTR(promiscuous),
439         GET_PORT_ATTR(num_mcast),
440         NULL
441 };
442
443 static struct sysfs_ops veth_port_sysfs_ops = {
444         .show = veth_port_attribute_show
445 };
446
447 static struct kobj_type veth_port_ktype = {
448         .sysfs_ops      = &veth_port_sysfs_ops,
449         .default_attrs  = veth_port_default_attrs
450 };
451
452 /*
453  * LPAR connection code
454  */
455
456 static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
457 {
458         schedule_delayed_work(&cnx->statemachine_wq, 0);
459 }
460
461 static void veth_take_cap(struct veth_lpar_connection *cnx,
462                           struct veth_lpevent *event)
463 {
464         unsigned long flags;
465
466         spin_lock_irqsave(&cnx->lock, flags);
467         /* Receiving caps may mean the other end has just come up, so
468          * we need to reload the instance ID of the far end */
469         cnx->dst_inst =
470                 HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
471                                                   HvLpEvent_Type_VirtualLan);
472
473         if (cnx->state & VETH_STATE_GOTCAPS) {
474                 veth_error("Received a second capabilities from LPAR %d.\n",
475                            cnx->remote_lp);
476                 event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
477                 HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
478         } else {
479                 memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
480                 cnx->state |= VETH_STATE_GOTCAPS;
481                 veth_kick_statemachine(cnx);
482         }
483         spin_unlock_irqrestore(&cnx->lock, flags);
484 }
485
486 static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
487                               struct veth_lpevent *event)
488 {
489         unsigned long flags;
490
491         spin_lock_irqsave(&cnx->lock, flags);
492         if (cnx->state & VETH_STATE_GOTCAPACK) {
493                 veth_error("Received a second capabilities ack from LPAR %d.\n",
494                            cnx->remote_lp);
495         } else {
496                 memcpy(&cnx->cap_ack_event, event,
497                        sizeof(&cnx->cap_ack_event));
498                 cnx->state |= VETH_STATE_GOTCAPACK;
499                 veth_kick_statemachine(cnx);
500         }
501         spin_unlock_irqrestore(&cnx->lock, flags);
502 }
503
504 static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
505                                   struct veth_lpevent *event)
506 {
507         unsigned long flags;
508
509         spin_lock_irqsave(&cnx->lock, flags);
510         veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
511
512         /* Avoid kicking the statemachine once we're shutdown.
513          * It's unnecessary and it could break veth_stop_connection(). */
514
515         if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
516                 cnx->state |= VETH_STATE_RESET;
517                 veth_kick_statemachine(cnx);
518         }
519         spin_unlock_irqrestore(&cnx->lock, flags);
520 }
521
522 static void veth_handle_ack(struct veth_lpevent *event)
523 {
524         HvLpIndex rlp = event->base_event.xTargetLp;
525         struct veth_lpar_connection *cnx = veth_cnx[rlp];
526
527         BUG_ON(! cnx);
528
529         switch (event->base_event.xSubtype) {
530         case VETH_EVENT_CAP:
531                 veth_take_cap_ack(cnx, event);
532                 break;
533         case VETH_EVENT_MONITOR:
534                 veth_take_monitor_ack(cnx, event);
535                 break;
536         default:
537                 veth_error("Unknown ack type %d from LPAR %d.\n",
538                                 event->base_event.xSubtype, rlp);
539         };
540 }
541
542 static void veth_handle_int(struct veth_lpevent *event)
543 {
544         HvLpIndex rlp = event->base_event.xSourceLp;
545         struct veth_lpar_connection *cnx = veth_cnx[rlp];
546         unsigned long flags;
547         int i, acked = 0;
548
549         BUG_ON(! cnx);
550
551         switch (event->base_event.xSubtype) {
552         case VETH_EVENT_CAP:
553                 veth_take_cap(cnx, event);
554                 break;
555         case VETH_EVENT_MONITOR:
556                 /* do nothing... this'll hang out here til we're dead,
557                  * and the hypervisor will return it for us. */
558                 break;
559         case VETH_EVENT_FRAMES_ACK:
560                 spin_lock_irqsave(&cnx->lock, flags);
561
562                 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
563                         u16 msgnum = event->u.frames_ack_data.token[i];
564
565                         if (msgnum < VETH_NUMBUFFERS) {
566                                 veth_recycle_msg(cnx, cnx->msgs + msgnum);
567                                 cnx->outstanding_tx--;
568                                 acked++;
569                         }
570                 }
571
572                 if (acked > 0) {
573                         cnx->last_contact = jiffies;
574                         veth_wake_queues(cnx);
575                 }
576
577                 spin_unlock_irqrestore(&cnx->lock, flags);
578                 break;
579         case VETH_EVENT_FRAMES:
580                 veth_receive(cnx, event);
581                 break;
582         default:
583                 veth_error("Unknown interrupt type %d from LPAR %d.\n",
584                                 event->base_event.xSubtype, rlp);
585         };
586 }
587
588 static void veth_handle_event(struct HvLpEvent *event)
589 {
590         struct veth_lpevent *veth_event = (struct veth_lpevent *)event;
591
592         if (hvlpevent_is_ack(event))
593                 veth_handle_ack(veth_event);
594         else
595                 veth_handle_int(veth_event);
596 }
597
598 static int veth_process_caps(struct veth_lpar_connection *cnx)
599 {
600         struct veth_cap_data *remote_caps = &cnx->remote_caps;
601         int num_acks_needed;
602
603         /* Convert timer to jiffies */
604         cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
605
606         if ( (remote_caps->num_buffers == 0)
607              || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
608              || (remote_caps->ack_threshold == 0)
609              || (cnx->ack_timeout == 0) ) {
610                 veth_error("Received incompatible capabilities from LPAR %d.\n",
611                                 cnx->remote_lp);
612                 return HvLpEvent_Rc_InvalidSubtypeData;
613         }
614
615         num_acks_needed = (remote_caps->num_buffers
616                            / remote_caps->ack_threshold) + 1;
617
618         /* FIXME: locking on num_ack_events? */
619         if (cnx->num_ack_events < num_acks_needed) {
620                 int num;
621
622                 num = veth_allocate_events(cnx->remote_lp,
623                                            num_acks_needed-cnx->num_ack_events);
624                 if (num > 0)
625                         cnx->num_ack_events += num;
626
627                 if (cnx->num_ack_events < num_acks_needed) {
628                         veth_error("Couldn't allocate enough ack events "
629                                         "for LPAR %d.\n", cnx->remote_lp);
630
631                         return HvLpEvent_Rc_BufferNotAvailable;
632                 }
633         }
634
635
636         return HvLpEvent_Rc_Good;
637 }
638
639 /* FIXME: The gotos here are a bit dubious */
640 static void veth_statemachine(struct work_struct *work)
641 {
642         struct veth_lpar_connection *cnx =
643                 container_of(work, struct veth_lpar_connection,
644                              statemachine_wq.work);
645         int rlp = cnx->remote_lp;
646         int rc;
647
648         spin_lock_irq(&cnx->lock);
649
650  restart:
651         if (cnx->state & VETH_STATE_RESET) {
652                 if (cnx->state & VETH_STATE_OPEN)
653                         HvCallEvent_closeLpEventPath(cnx->remote_lp,
654                                                      HvLpEvent_Type_VirtualLan);
655
656                 /*
657                  * Reset ack data. This prevents the ack_timer actually
658                  * doing anything, even if it runs one more time when
659                  * we drop the lock below.
660                  */
661                 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
662                 cnx->num_pending_acks = 0;
663
664                 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
665                                 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
666                                 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
667                                 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
668
669                 /* Clean up any leftover messages */
670                 if (cnx->msgs) {
671                         int i;
672                         for (i = 0; i < VETH_NUMBUFFERS; ++i)
673                                 veth_recycle_msg(cnx, cnx->msgs + i);
674                 }
675
676                 cnx->outstanding_tx = 0;
677                 veth_wake_queues(cnx);
678
679                 /* Drop the lock so we can do stuff that might sleep or
680                  * take other locks. */
681                 spin_unlock_irq(&cnx->lock);
682
683                 del_timer_sync(&cnx->ack_timer);
684                 del_timer_sync(&cnx->reset_timer);
685
686                 spin_lock_irq(&cnx->lock);
687
688                 if (cnx->state & VETH_STATE_RESET)
689                         goto restart;
690
691                 /* Hack, wait for the other end to reset itself. */
692                 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
693                         schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
694                         goto out;
695                 }
696         }
697
698         if (cnx->state & VETH_STATE_SHUTDOWN)
699                 /* It's all over, do nothing */
700                 goto out;
701
702         if ( !(cnx->state & VETH_STATE_OPEN) ) {
703                 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
704                         goto cant_cope;
705
706                 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
707                 cnx->src_inst =
708                         HvCallEvent_getSourceLpInstanceId(rlp,
709                                                           HvLpEvent_Type_VirtualLan);
710                 cnx->dst_inst =
711                         HvCallEvent_getTargetLpInstanceId(rlp,
712                                                           HvLpEvent_Type_VirtualLan);
713                 cnx->state |= VETH_STATE_OPEN;
714         }
715
716         if ( (cnx->state & VETH_STATE_OPEN)
717              && !(cnx->state & VETH_STATE_SENTMON) ) {
718                 rc = veth_signalevent(cnx, VETH_EVENT_MONITOR,
719                                       HvLpEvent_AckInd_DoAck,
720                                       HvLpEvent_AckType_DeferredAck,
721                                       0, 0, 0, 0, 0, 0);
722
723                 if (rc == HvLpEvent_Rc_Good) {
724                         cnx->state |= VETH_STATE_SENTMON;
725                 } else {
726                         if ( (rc != HvLpEvent_Rc_PartitionDead)
727                              && (rc != HvLpEvent_Rc_PathClosed) )
728                                 veth_error("Error sending monitor to LPAR %d, "
729                                                 "rc = %d\n", rlp, rc);
730
731                         /* Oh well, hope we get a cap from the other
732                          * end and do better when that kicks us */
733                         goto out;
734                 }
735         }
736
737         if ( (cnx->state & VETH_STATE_OPEN)
738              && !(cnx->state & VETH_STATE_SENTCAPS)) {
739                 u64 *rawcap = (u64 *)&cnx->local_caps;
740
741                 rc = veth_signalevent(cnx, VETH_EVENT_CAP,
742                                       HvLpEvent_AckInd_DoAck,
743                                       HvLpEvent_AckType_ImmediateAck,
744                                       0, rawcap[0], rawcap[1], rawcap[2],
745                                       rawcap[3], rawcap[4]);
746
747                 if (rc == HvLpEvent_Rc_Good) {
748                         cnx->state |= VETH_STATE_SENTCAPS;
749                 } else {
750                         if ( (rc != HvLpEvent_Rc_PartitionDead)
751                              && (rc != HvLpEvent_Rc_PathClosed) )
752                                 veth_error("Error sending caps to LPAR %d, "
753                                                 "rc = %d\n", rlp, rc);
754
755                         /* Oh well, hope we get a cap from the other
756                          * end and do better when that kicks us */
757                         goto out;
758                 }
759         }
760
761         if ((cnx->state & VETH_STATE_GOTCAPS)
762             && !(cnx->state & VETH_STATE_SENTCAPACK)) {
763                 struct veth_cap_data *remote_caps = &cnx->remote_caps;
764
765                 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
766                        sizeof(*remote_caps));
767
768                 spin_unlock_irq(&cnx->lock);
769                 rc = veth_process_caps(cnx);
770                 spin_lock_irq(&cnx->lock);
771
772                 /* We dropped the lock, so recheck for anything which
773                  * might mess us up */
774                 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
775                         goto restart;
776
777                 cnx->cap_event.base_event.xRc = rc;
778                 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
779                 if (rc == HvLpEvent_Rc_Good)
780                         cnx->state |= VETH_STATE_SENTCAPACK;
781                 else
782                         goto cant_cope;
783         }
784
785         if ((cnx->state & VETH_STATE_GOTCAPACK)
786             && (cnx->state & VETH_STATE_GOTCAPS)
787             && !(cnx->state & VETH_STATE_READY)) {
788                 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
789                         /* Start the ACK timer */
790                         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
791                         add_timer(&cnx->ack_timer);
792                         cnx->state |= VETH_STATE_READY;
793                 } else {
794                         veth_error("Caps rejected by LPAR %d, rc = %d\n",
795                                         rlp, cnx->cap_ack_event.base_event.xRc);
796                         goto cant_cope;
797                 }
798         }
799
800  out:
801         spin_unlock_irq(&cnx->lock);
802         return;
803
804  cant_cope:
805         /* FIXME: we get here if something happens we really can't
806          * cope with.  The link will never work once we get here, and
807          * all we can do is not lock the rest of the system up */
808         veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
809                         " (state = 0x%04lx)\n", rlp, cnx->state);
810         cnx->state |= VETH_STATE_SHUTDOWN;
811         spin_unlock_irq(&cnx->lock);
812 }
813
814 static int veth_init_connection(u8 rlp)
815 {
816         struct veth_lpar_connection *cnx;
817         struct veth_msg *msgs;
818         int i, rc;
819
820         if ( (rlp == this_lp)
821              || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
822                 return 0;
823
824         cnx = kzalloc(sizeof(*cnx), GFP_KERNEL);
825         if (! cnx)
826                 return -ENOMEM;
827
828         cnx->remote_lp = rlp;
829         spin_lock_init(&cnx->lock);
830         INIT_DELAYED_WORK(&cnx->statemachine_wq, veth_statemachine);
831
832         init_timer(&cnx->ack_timer);
833         cnx->ack_timer.function = veth_timed_ack;
834         cnx->ack_timer.data = (unsigned long) cnx;
835
836         init_timer(&cnx->reset_timer);
837         cnx->reset_timer.function = veth_timed_reset;
838         cnx->reset_timer.data = (unsigned long) cnx;
839         cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
840
841         memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
842
843         veth_cnx[rlp] = cnx;
844
845         /* This gets us 1 reference, which is held on behalf of the driver
846          * infrastructure. It's released at module unload. */
847         kobject_init(&cnx->kobject);
848         cnx->kobject.ktype = &veth_lpar_connection_ktype;
849         rc = kobject_set_name(&cnx->kobject, "cnx%.2d", rlp);
850         if (rc != 0)
851                 return rc;
852
853         msgs = kcalloc(VETH_NUMBUFFERS, sizeof(struct veth_msg), GFP_KERNEL);
854         if (! msgs) {
855                 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
856                 return -ENOMEM;
857         }
858
859         cnx->msgs = msgs;
860
861         for (i = 0; i < VETH_NUMBUFFERS; i++) {
862                 msgs[i].token = i;
863                 veth_stack_push(cnx, msgs + i);
864         }
865
866         cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
867
868         if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
869                 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
870                 return -ENOMEM;
871         }
872
873         cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
874         cnx->local_caps.ack_threshold = ACK_THRESHOLD;
875         cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
876
877         return 0;
878 }
879
880 static void veth_stop_connection(struct veth_lpar_connection *cnx)
881 {
882         if (!cnx)
883                 return;
884
885         spin_lock_irq(&cnx->lock);
886         cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
887         veth_kick_statemachine(cnx);
888         spin_unlock_irq(&cnx->lock);
889
890         /* There's a slim chance the reset code has just queued the
891          * statemachine to run in five seconds. If so we need to cancel
892          * that and requeue the work to run now. */
893         if (cancel_delayed_work(&cnx->statemachine_wq)) {
894                 spin_lock_irq(&cnx->lock);
895                 veth_kick_statemachine(cnx);
896                 spin_unlock_irq(&cnx->lock);
897         }
898
899         /* Wait for the state machine to run. */
900         flush_scheduled_work();
901 }
902
903 static void veth_destroy_connection(struct veth_lpar_connection *cnx)
904 {
905         if (!cnx)
906                 return;
907
908         if (cnx->num_events > 0)
909                 mf_deallocate_lp_events(cnx->remote_lp,
910                                       HvLpEvent_Type_VirtualLan,
911                                       cnx->num_events,
912                                       NULL, NULL);
913         if (cnx->num_ack_events > 0)
914                 mf_deallocate_lp_events(cnx->remote_lp,
915                                       HvLpEvent_Type_VirtualLan,
916                                       cnx->num_ack_events,
917                                       NULL, NULL);
918
919         kfree(cnx->msgs);
920         veth_cnx[cnx->remote_lp] = NULL;
921         kfree(cnx);
922 }
923
924 static void veth_release_connection(struct kobject *kobj)
925 {
926         struct veth_lpar_connection *cnx;
927         cnx = container_of(kobj, struct veth_lpar_connection, kobject);
928         veth_stop_connection(cnx);
929         veth_destroy_connection(cnx);
930 }
931
932 /*
933  * net_device code
934  */
935
936 static int veth_open(struct net_device *dev)
937 {
938         netif_start_queue(dev);
939         return 0;
940 }
941
942 static int veth_close(struct net_device *dev)
943 {
944         netif_stop_queue(dev);
945         return 0;
946 }
947
948 static int veth_change_mtu(struct net_device *dev, int new_mtu)
949 {
950         if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
951                 return -EINVAL;
952         dev->mtu = new_mtu;
953         return 0;
954 }
955
956 static void veth_set_multicast_list(struct net_device *dev)
957 {
958         struct veth_port *port = (struct veth_port *) dev->priv;
959         unsigned long flags;
960
961         write_lock_irqsave(&port->mcast_gate, flags);
962
963         if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
964                         (dev->mc_count > VETH_MAX_MCAST)) {
965                 port->promiscuous = 1;
966         } else {
967                 struct dev_mc_list *dmi = dev->mc_list;
968                 int i;
969
970                 port->promiscuous = 0;
971
972                 /* Update table */
973                 port->num_mcast = 0;
974
975                 for (i = 0; i < dev->mc_count; i++) {
976                         u8 *addr = dmi->dmi_addr;
977                         u64 xaddr = 0;
978
979                         if (addr[0] & 0x01) {/* multicast address? */
980                                 memcpy(&xaddr, addr, ETH_ALEN);
981                                 port->mcast_addr[port->num_mcast] = xaddr;
982                                 port->num_mcast++;
983                         }
984                         dmi = dmi->next;
985                 }
986         }
987
988         write_unlock_irqrestore(&port->mcast_gate, flags);
989 }
990
991 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
992 {
993         strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
994         info->driver[sizeof(info->driver) - 1] = '\0';
995         strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
996         info->version[sizeof(info->version) - 1] = '\0';
997 }
998
999 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
1000 {
1001         ecmd->supported = (SUPPORTED_1000baseT_Full
1002                           | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1003         ecmd->advertising = (SUPPORTED_1000baseT_Full
1004                             | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1005         ecmd->port = PORT_FIBRE;
1006         ecmd->transceiver = XCVR_INTERNAL;
1007         ecmd->phy_address = 0;
1008         ecmd->speed = SPEED_1000;
1009         ecmd->duplex = DUPLEX_FULL;
1010         ecmd->autoneg = AUTONEG_ENABLE;
1011         ecmd->maxtxpkt = 120;
1012         ecmd->maxrxpkt = 120;
1013         return 0;
1014 }
1015
1016 static u32 veth_get_link(struct net_device *dev)
1017 {
1018         return 1;
1019 }
1020
1021 static const struct ethtool_ops ops = {
1022         .get_drvinfo = veth_get_drvinfo,
1023         .get_settings = veth_get_settings,
1024         .get_link = veth_get_link,
1025 };
1026
1027 static struct net_device * __init veth_probe_one(int vlan,
1028                 struct vio_dev *vio_dev)
1029 {
1030         struct net_device *dev;
1031         struct veth_port *port;
1032         struct device *vdev = &vio_dev->dev;
1033         int i, rc;
1034         const unsigned char *mac_addr;
1035
1036         mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
1037         if (mac_addr == NULL)
1038                 mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
1039         if (mac_addr == NULL) {
1040                 veth_error("Unable to fetch MAC address from device tree.\n");
1041                 return NULL;
1042         }
1043
1044         dev = alloc_etherdev(sizeof (struct veth_port));
1045         if (! dev) {
1046                 veth_error("Unable to allocate net_device structure!\n");
1047                 return NULL;
1048         }
1049
1050         port = (struct veth_port *) dev->priv;
1051
1052         spin_lock_init(&port->queue_lock);
1053         rwlock_init(&port->mcast_gate);
1054         port->stopped_map = 0;
1055
1056         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1057                 HvLpVirtualLanIndexMap map;
1058
1059                 if (i == this_lp)
1060                         continue;
1061                 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
1062                 if (map & (0x8000 >> vlan))
1063                         port->lpar_map |= (1 << i);
1064         }
1065         port->dev = vdev;
1066
1067         memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
1068
1069         dev->mtu = VETH_MAX_MTU;
1070
1071         memcpy(&port->mac_addr, mac_addr, ETH_ALEN);
1072
1073         dev->open = veth_open;
1074         dev->hard_start_xmit = veth_start_xmit;
1075         dev->stop = veth_close;
1076         dev->change_mtu = veth_change_mtu;
1077         dev->set_mac_address = NULL;
1078         dev->set_multicast_list = veth_set_multicast_list;
1079         SET_ETHTOOL_OPS(dev, &ops);
1080
1081         SET_NETDEV_DEV(dev, vdev);
1082
1083         rc = register_netdev(dev);
1084         if (rc != 0) {
1085                 veth_error("Failed registering net device for vlan%d.\n", vlan);
1086                 free_netdev(dev);
1087                 return NULL;
1088         }
1089
1090         kobject_init(&port->kobject);
1091         port->kobject.parent = &dev->dev.kobj;
1092         port->kobject.ktype  = &veth_port_ktype;
1093         kobject_set_name(&port->kobject, "veth_port");
1094         if (0 != kobject_add(&port->kobject))
1095                 veth_error("Failed adding port for %s to sysfs.\n", dev->name);
1096
1097         veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
1098                         dev->name, vlan, port->lpar_map);
1099
1100         return dev;
1101 }
1102
1103 /*
1104  * Tx path
1105  */
1106
1107 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
1108                                 struct net_device *dev)
1109 {
1110         struct veth_lpar_connection *cnx = veth_cnx[rlp];
1111         struct veth_port *port = (struct veth_port *) dev->priv;
1112         HvLpEvent_Rc rc;
1113         struct veth_msg *msg = NULL;
1114         unsigned long flags;
1115
1116         if (! cnx)
1117                 return 0;
1118
1119         spin_lock_irqsave(&cnx->lock, flags);
1120
1121         if (! (cnx->state & VETH_STATE_READY))
1122                 goto no_error;
1123
1124         if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
1125                 goto drop;
1126
1127         msg = veth_stack_pop(cnx);
1128         if (! msg)
1129                 goto drop;
1130
1131         msg->in_use = 1;
1132         msg->skb = skb_get(skb);
1133
1134         msg->data.addr[0] = dma_map_single(port->dev, skb->data,
1135                                 skb->len, DMA_TO_DEVICE);
1136
1137         if (dma_mapping_error(msg->data.addr[0]))
1138                 goto recycle_and_drop;
1139
1140         msg->dev = port->dev;
1141         msg->data.len[0] = skb->len;
1142         msg->data.eofmask = 1 << VETH_EOF_SHIFT;
1143
1144         rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
1145
1146         if (rc != HvLpEvent_Rc_Good)
1147                 goto recycle_and_drop;
1148
1149         /* If the timer's not already running, start it now. */
1150         if (0 == cnx->outstanding_tx)
1151                 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
1152
1153         cnx->last_contact = jiffies;
1154         cnx->outstanding_tx++;
1155
1156         if (veth_stack_is_empty(cnx))
1157                 veth_stop_queues(cnx);
1158
1159  no_error:
1160         spin_unlock_irqrestore(&cnx->lock, flags);
1161         return 0;
1162
1163  recycle_and_drop:
1164         veth_recycle_msg(cnx, msg);
1165  drop:
1166         spin_unlock_irqrestore(&cnx->lock, flags);
1167         return 1;
1168 }
1169
1170 static void veth_transmit_to_many(struct sk_buff *skb,
1171                                           HvLpIndexMap lpmask,
1172                                           struct net_device *dev)
1173 {
1174         int i, success, error;
1175
1176         success = error = 0;
1177
1178         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1179                 if ((lpmask & (1 << i)) == 0)
1180                         continue;
1181
1182                 if (veth_transmit_to_one(skb, i, dev))
1183                         error = 1;
1184                 else
1185                         success = 1;
1186         }
1187
1188         if (error)
1189                 dev->stats.tx_errors++;
1190
1191         if (success) {
1192                 dev->stats.tx_packets++;
1193                 dev->stats.tx_bytes += skb->len;
1194         }
1195 }
1196
1197 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1198 {
1199         unsigned char *frame = skb->data;
1200         struct veth_port *port = (struct veth_port *) dev->priv;
1201         HvLpIndexMap lpmask;
1202
1203         if (! (frame[0] & 0x01)) {
1204                 /* unicast packet */
1205                 HvLpIndex rlp = frame[5];
1206
1207                 if ( ! ((1 << rlp) & port->lpar_map) ) {
1208                         dev_kfree_skb(skb);
1209                         return 0;
1210                 }
1211
1212                 lpmask = 1 << rlp;
1213         } else {
1214                 lpmask = port->lpar_map;
1215         }
1216
1217         veth_transmit_to_many(skb, lpmask, dev);
1218
1219         dev_kfree_skb(skb);
1220
1221         return 0;
1222 }
1223
1224 /* You must hold the connection's lock when you call this function. */
1225 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1226                              struct veth_msg *msg)
1227 {
1228         u32 dma_address, dma_length;
1229
1230         if (msg->in_use) {
1231                 msg->in_use = 0;
1232                 dma_address = msg->data.addr[0];
1233                 dma_length = msg->data.len[0];
1234
1235                 if (!dma_mapping_error(dma_address))
1236                         dma_unmap_single(msg->dev, dma_address, dma_length,
1237                                         DMA_TO_DEVICE);
1238
1239                 if (msg->skb) {
1240                         dev_kfree_skb_any(msg->skb);
1241                         msg->skb = NULL;
1242                 }
1243
1244                 memset(&msg->data, 0, sizeof(msg->data));
1245                 veth_stack_push(cnx, msg);
1246         } else if (cnx->state & VETH_STATE_OPEN) {
1247                 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1248                                 cnx->remote_lp, msg->token);
1249         }
1250 }
1251
1252 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1253 {
1254         int i;
1255
1256         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1257                 struct net_device *dev = veth_dev[i];
1258                 struct veth_port *port;
1259                 unsigned long flags;
1260
1261                 if (! dev)
1262                         continue;
1263
1264                 port = (struct veth_port *)dev->priv;
1265
1266                 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1267                         continue;
1268
1269                 spin_lock_irqsave(&port->queue_lock, flags);
1270
1271                 port->stopped_map &= ~(1 << cnx->remote_lp);
1272
1273                 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1274                         veth_debug("cnx %d: woke queue for %s.\n",
1275                                         cnx->remote_lp, dev->name);
1276                         netif_wake_queue(dev);
1277                 }
1278                 spin_unlock_irqrestore(&port->queue_lock, flags);
1279         }
1280 }
1281
1282 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1283 {
1284         int i;
1285
1286         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1287                 struct net_device *dev = veth_dev[i];
1288                 struct veth_port *port;
1289
1290                 if (! dev)
1291                         continue;
1292
1293                 port = (struct veth_port *)dev->priv;
1294
1295                 /* If this cnx is not on the vlan for this port, continue */
1296                 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1297                         continue;
1298
1299                 spin_lock(&port->queue_lock);
1300
1301                 netif_stop_queue(dev);
1302                 port->stopped_map |= (1 << cnx->remote_lp);
1303
1304                 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1305                                 cnx->remote_lp, dev->name, port->stopped_map);
1306
1307                 spin_unlock(&port->queue_lock);
1308         }
1309 }
1310
1311 static void veth_timed_reset(unsigned long ptr)
1312 {
1313         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1314         unsigned long trigger_time, flags;
1315
1316         /* FIXME is it possible this fires after veth_stop_connection()?
1317          * That would reschedule the statemachine for 5 seconds and probably
1318          * execute it after the module's been unloaded. Hmm. */
1319
1320         spin_lock_irqsave(&cnx->lock, flags);
1321
1322         if (cnx->outstanding_tx > 0) {
1323                 trigger_time = cnx->last_contact + cnx->reset_timeout;
1324
1325                 if (trigger_time < jiffies) {
1326                         cnx->state |= VETH_STATE_RESET;
1327                         veth_kick_statemachine(cnx);
1328                         veth_error("%d packets not acked by LPAR %d within %d "
1329                                         "seconds, resetting.\n",
1330                                         cnx->outstanding_tx, cnx->remote_lp,
1331                                         cnx->reset_timeout / HZ);
1332                 } else {
1333                         /* Reschedule the timer */
1334                         trigger_time = jiffies + cnx->reset_timeout;
1335                         mod_timer(&cnx->reset_timer, trigger_time);
1336                 }
1337         }
1338
1339         spin_unlock_irqrestore(&cnx->lock, flags);
1340 }
1341
1342 /*
1343  * Rx path
1344  */
1345
1346 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1347 {
1348         int wanted = 0;
1349         int i;
1350         unsigned long flags;
1351
1352         if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1353                 return 1;
1354
1355         read_lock_irqsave(&port->mcast_gate, flags);
1356
1357         if (port->promiscuous) {
1358                 wanted = 1;
1359                 goto out;
1360         }
1361
1362         for (i = 0; i < port->num_mcast; ++i) {
1363                 if (port->mcast_addr[i] == mac_addr) {
1364                         wanted = 1;
1365                         break;
1366                 }
1367         }
1368
1369  out:
1370         read_unlock_irqrestore(&port->mcast_gate, flags);
1371
1372         return wanted;
1373 }
1374
1375 struct dma_chunk {
1376         u64 addr;
1377         u64 size;
1378 };
1379
1380 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1381
1382 static inline void veth_build_dma_list(struct dma_chunk *list,
1383                                        unsigned char *p, unsigned long length)
1384 {
1385         unsigned long done;
1386         int i = 1;
1387
1388         /* FIXME: skbs are continguous in real addresses.  Do we
1389          * really need to break it into PAGE_SIZE chunks, or can we do
1390          * it just at the granularity of iSeries real->absolute
1391          * mapping?  Indeed, given the way the allocator works, can we
1392          * count on them being absolutely contiguous? */
1393         list[0].addr = iseries_hv_addr(p);
1394         list[0].size = min(length,
1395                            PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1396
1397         done = list[0].size;
1398         while (done < length) {
1399                 list[i].addr = iseries_hv_addr(p + done);
1400                 list[i].size = min(length-done, PAGE_SIZE);
1401                 done += list[i].size;
1402                 i++;
1403         }
1404 }
1405
1406 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1407 {
1408         HvLpEvent_Rc rc;
1409
1410         rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
1411                              0, &cnx->pending_acks);
1412
1413         if (rc != HvLpEvent_Rc_Good)
1414                 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1415                                 cnx->remote_lp, (int)rc);
1416
1417         cnx->num_pending_acks = 0;
1418         memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1419 }
1420
1421 static void veth_receive(struct veth_lpar_connection *cnx,
1422                          struct veth_lpevent *event)
1423 {
1424         struct veth_frames_data *senddata = &event->u.frames_data;
1425         int startchunk = 0;
1426         int nchunks;
1427         unsigned long flags;
1428         HvLpDma_Rc rc;
1429
1430         do {
1431                 u16 length = 0;
1432                 struct sk_buff *skb;
1433                 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1434                 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1435                 u64 dest;
1436                 HvLpVirtualLanIndex vlan;
1437                 struct net_device *dev;
1438                 struct veth_port *port;
1439
1440                 /* FIXME: do we need this? */
1441                 memset(local_list, 0, sizeof(local_list));
1442                 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1443
1444                 /* a 0 address marks the end of the valid entries */
1445                 if (senddata->addr[startchunk] == 0)
1446                         break;
1447
1448                 /* make sure that we have at least 1 EOF entry in the
1449                  * remaining entries */
1450                 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1451                         veth_error("Missing EOF fragment in event "
1452                                         "eofmask = 0x%x startchunk = %d\n",
1453                                         (unsigned)senddata->eofmask,
1454                                         startchunk);
1455                         break;
1456                 }
1457
1458                 /* build list of chunks in this frame */
1459                 nchunks = 0;
1460                 do {
1461                         remote_list[nchunks].addr =
1462                                 (u64) senddata->addr[startchunk+nchunks] << 32;
1463                         remote_list[nchunks].size =
1464                                 senddata->len[startchunk+nchunks];
1465                         length += remote_list[nchunks].size;
1466                 } while (! (senddata->eofmask &
1467                             (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1468
1469                 /* length == total length of all chunks */
1470                 /* nchunks == # of chunks in this frame */
1471
1472                 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1473                         veth_error("Received oversize frame from LPAR %d "
1474                                         "(length = %d)\n",
1475                                         cnx->remote_lp, length);
1476                         continue;
1477                 }
1478
1479                 skb = alloc_skb(length, GFP_ATOMIC);
1480                 if (!skb)
1481                         continue;
1482
1483                 veth_build_dma_list(local_list, skb->data, length);
1484
1485                 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1486                                             event->base_event.xSourceLp,
1487                                             HvLpDma_Direction_RemoteToLocal,
1488                                             cnx->src_inst,
1489                                             cnx->dst_inst,
1490                                             HvLpDma_AddressType_RealAddress,
1491                                             HvLpDma_AddressType_TceIndex,
1492                                             iseries_hv_addr(&local_list),
1493                                             iseries_hv_addr(&remote_list),
1494                                             length);
1495                 if (rc != HvLpDma_Rc_Good) {
1496                         dev_kfree_skb_irq(skb);
1497                         continue;
1498                 }
1499
1500                 vlan = skb->data[9];
1501                 dev = veth_dev[vlan];
1502                 if (! dev) {
1503                         /*
1504                          * Some earlier versions of the driver sent
1505                          * broadcasts down all connections, even to lpars
1506                          * that weren't on the relevant vlan. So ignore
1507                          * packets belonging to a vlan we're not on.
1508                          * We can also be here if we receive packets while
1509                          * the driver is going down, because then dev is NULL.
1510                          */
1511                         dev_kfree_skb_irq(skb);
1512                         continue;
1513                 }
1514
1515                 port = (struct veth_port *)dev->priv;
1516                 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1517
1518                 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1519                         dev_kfree_skb_irq(skb);
1520                         continue;
1521                 }
1522                 if (! veth_frame_wanted(port, dest)) {
1523                         dev_kfree_skb_irq(skb);
1524                         continue;
1525                 }
1526
1527                 skb_put(skb, length);
1528                 skb->protocol = eth_type_trans(skb, dev);
1529                 skb->ip_summed = CHECKSUM_NONE;
1530                 netif_rx(skb);  /* send it up */
1531                 dev->stats.rx_packets++;
1532                 dev->stats.rx_bytes += length;
1533         } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1534
1535         /* Ack it */
1536         spin_lock_irqsave(&cnx->lock, flags);
1537         BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1538
1539         cnx->pending_acks[cnx->num_pending_acks++] =
1540                 event->base_event.xCorrelationToken;
1541
1542         if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1543              || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1544                 veth_flush_acks(cnx);
1545
1546         spin_unlock_irqrestore(&cnx->lock, flags);
1547 }
1548
1549 static void veth_timed_ack(unsigned long ptr)
1550 {
1551         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1552         unsigned long flags;
1553
1554         /* Ack all the events */
1555         spin_lock_irqsave(&cnx->lock, flags);
1556         if (cnx->num_pending_acks > 0)
1557                 veth_flush_acks(cnx);
1558
1559         /* Reschedule the timer */
1560         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1561         add_timer(&cnx->ack_timer);
1562         spin_unlock_irqrestore(&cnx->lock, flags);
1563 }
1564
1565 static int veth_remove(struct vio_dev *vdev)
1566 {
1567         struct veth_lpar_connection *cnx;
1568         struct net_device *dev;
1569         struct veth_port *port;
1570         int i;
1571
1572         dev = veth_dev[vdev->unit_address];
1573
1574         if (! dev)
1575                 return 0;
1576
1577         port = netdev_priv(dev);
1578
1579         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1580                 cnx = veth_cnx[i];
1581
1582                 if (cnx && (port->lpar_map & (1 << i))) {
1583                         /* Drop our reference to connections on our VLAN */
1584                         kobject_put(&cnx->kobject);
1585                 }
1586         }
1587
1588         veth_dev[vdev->unit_address] = NULL;
1589         kobject_del(&port->kobject);
1590         kobject_put(&port->kobject);
1591         unregister_netdev(dev);
1592         free_netdev(dev);
1593
1594         return 0;
1595 }
1596
1597 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1598 {
1599         int i = vdev->unit_address;
1600         struct net_device *dev;
1601         struct veth_port *port;
1602
1603         dev = veth_probe_one(i, vdev);
1604         if (dev == NULL) {
1605                 veth_remove(vdev);
1606                 return 1;
1607         }
1608         veth_dev[i] = dev;
1609
1610         port = (struct veth_port*)netdev_priv(dev);
1611
1612         /* Start the state machine on each connection on this vlan. If we're
1613          * the first dev to do so this will commence link negotiation */
1614         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1615                 struct veth_lpar_connection *cnx;
1616
1617                 if (! (port->lpar_map & (1 << i)))
1618                         continue;
1619
1620                 cnx = veth_cnx[i];
1621                 if (!cnx)
1622                         continue;
1623
1624                 kobject_get(&cnx->kobject);
1625                 veth_kick_statemachine(cnx);
1626         }
1627
1628         return 0;
1629 }
1630
1631 /**
1632  * veth_device_table: Used by vio.c to match devices that we
1633  * support.
1634  */
1635 static struct vio_device_id veth_device_table[] __devinitdata = {
1636         { "network", "IBM,iSeries-l-lan" },
1637         { "", "" }
1638 };
1639 MODULE_DEVICE_TABLE(vio, veth_device_table);
1640
1641 static struct vio_driver veth_driver = {
1642         .id_table = veth_device_table,
1643         .probe = veth_probe,
1644         .remove = veth_remove,
1645         .driver = {
1646                 .name = DRV_NAME,
1647                 .owner = THIS_MODULE,
1648         }
1649 };
1650
1651 /*
1652  * Module initialization/cleanup
1653  */
1654
1655 static void __exit veth_module_cleanup(void)
1656 {
1657         int i;
1658         struct veth_lpar_connection *cnx;
1659
1660         /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1661         HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1662
1663         /* Make sure any work queued from Hypervisor callbacks is finished. */
1664         flush_scheduled_work();
1665
1666         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1667                 cnx = veth_cnx[i];
1668
1669                 if (!cnx)
1670                         continue;
1671
1672                 /* Remove the connection from sysfs */
1673                 kobject_del(&cnx->kobject);
1674                 /* Drop the driver's reference to the connection */
1675                 kobject_put(&cnx->kobject);
1676         }
1677
1678         /* Unregister the driver, which will close all the netdevs and stop
1679          * the connections when they're no longer referenced. */
1680         vio_unregister_driver(&veth_driver);
1681 }
1682 module_exit(veth_module_cleanup);
1683
1684 static int __init veth_module_init(void)
1685 {
1686         int i;
1687         int rc;
1688
1689         if (!firmware_has_feature(FW_FEATURE_ISERIES))
1690                 return -ENODEV;
1691
1692         this_lp = HvLpConfig_getLpIndex_outline();
1693
1694         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1695                 rc = veth_init_connection(i);
1696                 if (rc != 0)
1697                         goto error;
1698         }
1699
1700         HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1701                                   &veth_handle_event);
1702
1703         rc = vio_register_driver(&veth_driver);
1704         if (rc != 0)
1705                 goto error;
1706
1707         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1708                 struct kobject *kobj;
1709
1710                 if (!veth_cnx[i])
1711                         continue;
1712
1713                 kobj = &veth_cnx[i]->kobject;
1714                 kobj->parent = &veth_driver.driver.kobj;
1715                 /* If the add failes, complain but otherwise continue */
1716                 if (0 != kobject_add(kobj))
1717                         veth_error("cnx %d: Failed adding to sysfs.\n", i);
1718         }
1719
1720         return 0;
1721
1722 error:
1723         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1724                 veth_destroy_connection(veth_cnx[i]);
1725         }
1726
1727         return rc;
1728 }
1729 module_init(veth_module_init);