x86/PCI: truncate _CRS windows with _LEN > _MAX - _MIN + 1
[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 =
312                 { COMPLETION_INITIALIZER_ONSTACK(vc.c), 0 };
313
314         mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
315                             sizeof(struct veth_lpevent), number,
316                             &veth_complete_allocation, &vc);
317         wait_for_completion(&vc.c);
318
319         return vc.num;
320 }
321
322 /*
323  * sysfs support
324  */
325
326 struct veth_cnx_attribute {
327         struct attribute attr;
328         ssize_t (*show)(struct veth_lpar_connection *, char *buf);
329         ssize_t (*store)(struct veth_lpar_connection *, const char *buf);
330 };
331
332 static ssize_t veth_cnx_attribute_show(struct kobject *kobj,
333                 struct attribute *attr, char *buf)
334 {
335         struct veth_cnx_attribute *cnx_attr;
336         struct veth_lpar_connection *cnx;
337
338         cnx_attr = container_of(attr, struct veth_cnx_attribute, attr);
339         cnx = container_of(kobj, struct veth_lpar_connection, kobject);
340
341         if (!cnx_attr->show)
342                 return -EIO;
343
344         return cnx_attr->show(cnx, buf);
345 }
346
347 #define CUSTOM_CNX_ATTR(_name, _format, _expression)                    \
348 static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\
349 {                                                                       \
350         return sprintf(buf, _format, _expression);                      \
351 }                                                                       \
352 struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name)
353
354 #define SIMPLE_CNX_ATTR(_name)  \
355         CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name)
356
357 SIMPLE_CNX_ATTR(outstanding_tx);
358 SIMPLE_CNX_ATTR(remote_lp);
359 SIMPLE_CNX_ATTR(num_events);
360 SIMPLE_CNX_ATTR(src_inst);
361 SIMPLE_CNX_ATTR(dst_inst);
362 SIMPLE_CNX_ATTR(num_pending_acks);
363 SIMPLE_CNX_ATTR(num_ack_events);
364 CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout));
365 CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout));
366 CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state);
367 CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ?
368                 jiffies_to_msecs(jiffies - cnx->last_contact) : 0);
369
370 #define GET_CNX_ATTR(_name)     (&veth_cnx_attr_##_name.attr)
371
372 static struct attribute *veth_cnx_default_attrs[] = {
373         GET_CNX_ATTR(outstanding_tx),
374         GET_CNX_ATTR(remote_lp),
375         GET_CNX_ATTR(num_events),
376         GET_CNX_ATTR(reset_timeout),
377         GET_CNX_ATTR(last_contact),
378         GET_CNX_ATTR(state),
379         GET_CNX_ATTR(src_inst),
380         GET_CNX_ATTR(dst_inst),
381         GET_CNX_ATTR(num_pending_acks),
382         GET_CNX_ATTR(num_ack_events),
383         GET_CNX_ATTR(ack_timeout),
384         NULL
385 };
386
387 static const struct sysfs_ops veth_cnx_sysfs_ops = {
388                 .show = veth_cnx_attribute_show
389 };
390
391 static struct kobj_type veth_lpar_connection_ktype = {
392         .release        = veth_release_connection,
393         .sysfs_ops      = &veth_cnx_sysfs_ops,
394         .default_attrs  = veth_cnx_default_attrs
395 };
396
397 struct veth_port_attribute {
398         struct attribute attr;
399         ssize_t (*show)(struct veth_port *, char *buf);
400         ssize_t (*store)(struct veth_port *, const char *buf);
401 };
402
403 static ssize_t veth_port_attribute_show(struct kobject *kobj,
404                 struct attribute *attr, char *buf)
405 {
406         struct veth_port_attribute *port_attr;
407         struct veth_port *port;
408
409         port_attr = container_of(attr, struct veth_port_attribute, attr);
410         port = container_of(kobj, struct veth_port, kobject);
411
412         if (!port_attr->show)
413                 return -EIO;
414
415         return port_attr->show(port, buf);
416 }
417
418 #define CUSTOM_PORT_ATTR(_name, _format, _expression)                   \
419 static ssize_t _name##_show(struct veth_port *port, char *buf)          \
420 {                                                                       \
421         return sprintf(buf, _format, _expression);                      \
422 }                                                                       \
423 struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name)
424
425 #define SIMPLE_PORT_ATTR(_name) \
426         CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name)
427
428 SIMPLE_PORT_ATTR(promiscuous);
429 SIMPLE_PORT_ATTR(num_mcast);
430 CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map);
431 CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map);
432 CUSTOM_PORT_ATTR(mac_addr, "0x%llX\n", port->mac_addr);
433
434 #define GET_PORT_ATTR(_name)    (&veth_port_attr_##_name.attr)
435 static struct attribute *veth_port_default_attrs[] = {
436         GET_PORT_ATTR(mac_addr),
437         GET_PORT_ATTR(lpar_map),
438         GET_PORT_ATTR(stopped_map),
439         GET_PORT_ATTR(promiscuous),
440         GET_PORT_ATTR(num_mcast),
441         NULL
442 };
443
444 static const struct sysfs_ops veth_port_sysfs_ops = {
445         .show = veth_port_attribute_show
446 };
447
448 static struct kobj_type veth_port_ktype = {
449         .sysfs_ops      = &veth_port_sysfs_ops,
450         .default_attrs  = veth_port_default_attrs
451 };
452
453 /*
454  * LPAR connection code
455  */
456
457 static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
458 {
459         schedule_delayed_work(&cnx->statemachine_wq, 0);
460 }
461
462 static void veth_take_cap(struct veth_lpar_connection *cnx,
463                           struct veth_lpevent *event)
464 {
465         unsigned long flags;
466
467         spin_lock_irqsave(&cnx->lock, flags);
468         /* Receiving caps may mean the other end has just come up, so
469          * we need to reload the instance ID of the far end */
470         cnx->dst_inst =
471                 HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
472                                                   HvLpEvent_Type_VirtualLan);
473
474         if (cnx->state & VETH_STATE_GOTCAPS) {
475                 veth_error("Received a second capabilities from LPAR %d.\n",
476                            cnx->remote_lp);
477                 event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
478                 HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
479         } else {
480                 memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
481                 cnx->state |= VETH_STATE_GOTCAPS;
482                 veth_kick_statemachine(cnx);
483         }
484         spin_unlock_irqrestore(&cnx->lock, flags);
485 }
486
487 static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
488                               struct veth_lpevent *event)
489 {
490         unsigned long flags;
491
492         spin_lock_irqsave(&cnx->lock, flags);
493         if (cnx->state & VETH_STATE_GOTCAPACK) {
494                 veth_error("Received a second capabilities ack from LPAR %d.\n",
495                            cnx->remote_lp);
496         } else {
497                 memcpy(&cnx->cap_ack_event, event,
498                        sizeof(cnx->cap_ack_event));
499                 cnx->state |= VETH_STATE_GOTCAPACK;
500                 veth_kick_statemachine(cnx);
501         }
502         spin_unlock_irqrestore(&cnx->lock, flags);
503 }
504
505 static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
506                                   struct veth_lpevent *event)
507 {
508         unsigned long flags;
509
510         spin_lock_irqsave(&cnx->lock, flags);
511         veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
512
513         /* Avoid kicking the statemachine once we're shutdown.
514          * It's unnecessary and it could break veth_stop_connection(). */
515
516         if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
517                 cnx->state |= VETH_STATE_RESET;
518                 veth_kick_statemachine(cnx);
519         }
520         spin_unlock_irqrestore(&cnx->lock, flags);
521 }
522
523 static void veth_handle_ack(struct veth_lpevent *event)
524 {
525         HvLpIndex rlp = event->base_event.xTargetLp;
526         struct veth_lpar_connection *cnx = veth_cnx[rlp];
527
528         BUG_ON(! cnx);
529
530         switch (event->base_event.xSubtype) {
531         case VETH_EVENT_CAP:
532                 veth_take_cap_ack(cnx, event);
533                 break;
534         case VETH_EVENT_MONITOR:
535                 veth_take_monitor_ack(cnx, event);
536                 break;
537         default:
538                 veth_error("Unknown ack type %d from LPAR %d.\n",
539                                 event->base_event.xSubtype, rlp);
540         };
541 }
542
543 static void veth_handle_int(struct veth_lpevent *event)
544 {
545         HvLpIndex rlp = event->base_event.xSourceLp;
546         struct veth_lpar_connection *cnx = veth_cnx[rlp];
547         unsigned long flags;
548         int i, acked = 0;
549
550         BUG_ON(! cnx);
551
552         switch (event->base_event.xSubtype) {
553         case VETH_EVENT_CAP:
554                 veth_take_cap(cnx, event);
555                 break;
556         case VETH_EVENT_MONITOR:
557                 /* do nothing... this'll hang out here til we're dead,
558                  * and the hypervisor will return it for us. */
559                 break;
560         case VETH_EVENT_FRAMES_ACK:
561                 spin_lock_irqsave(&cnx->lock, flags);
562
563                 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
564                         u16 msgnum = event->u.frames_ack_data.token[i];
565
566                         if (msgnum < VETH_NUMBUFFERS) {
567                                 veth_recycle_msg(cnx, cnx->msgs + msgnum);
568                                 cnx->outstanding_tx--;
569                                 acked++;
570                         }
571                 }
572
573                 if (acked > 0) {
574                         cnx->last_contact = jiffies;
575                         veth_wake_queues(cnx);
576                 }
577
578                 spin_unlock_irqrestore(&cnx->lock, flags);
579                 break;
580         case VETH_EVENT_FRAMES:
581                 veth_receive(cnx, event);
582                 break;
583         default:
584                 veth_error("Unknown interrupt type %d from LPAR %d.\n",
585                                 event->base_event.xSubtype, rlp);
586         };
587 }
588
589 static void veth_handle_event(struct HvLpEvent *event)
590 {
591         struct veth_lpevent *veth_event = (struct veth_lpevent *)event;
592
593         if (hvlpevent_is_ack(event))
594                 veth_handle_ack(veth_event);
595         else
596                 veth_handle_int(veth_event);
597 }
598
599 static int veth_process_caps(struct veth_lpar_connection *cnx)
600 {
601         struct veth_cap_data *remote_caps = &cnx->remote_caps;
602         int num_acks_needed;
603
604         /* Convert timer to jiffies */
605         cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
606
607         if ( (remote_caps->num_buffers == 0) ||
608              (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG) ||
609              (remote_caps->ack_threshold == 0) ||
610              (cnx->ack_timeout == 0) ) {
611                 veth_error("Received incompatible capabilities from LPAR %d.\n",
612                                 cnx->remote_lp);
613                 return HvLpEvent_Rc_InvalidSubtypeData;
614         }
615
616         num_acks_needed = (remote_caps->num_buffers
617                            / remote_caps->ack_threshold) + 1;
618
619         /* FIXME: locking on num_ack_events? */
620         if (cnx->num_ack_events < num_acks_needed) {
621                 int num;
622
623                 num = veth_allocate_events(cnx->remote_lp,
624                                            num_acks_needed-cnx->num_ack_events);
625                 if (num > 0)
626                         cnx->num_ack_events += num;
627
628                 if (cnx->num_ack_events < num_acks_needed) {
629                         veth_error("Couldn't allocate enough ack events "
630                                         "for LPAR %d.\n", cnx->remote_lp);
631
632                         return HvLpEvent_Rc_BufferNotAvailable;
633                 }
634         }
635
636
637         return HvLpEvent_Rc_Good;
638 }
639
640 /* FIXME: The gotos here are a bit dubious */
641 static void veth_statemachine(struct work_struct *work)
642 {
643         struct veth_lpar_connection *cnx =
644                 container_of(work, struct veth_lpar_connection,
645                              statemachine_wq.work);
646         int rlp = cnx->remote_lp;
647         int rc;
648
649         spin_lock_irq(&cnx->lock);
650
651  restart:
652         if (cnx->state & VETH_STATE_RESET) {
653                 if (cnx->state & VETH_STATE_OPEN)
654                         HvCallEvent_closeLpEventPath(cnx->remote_lp,
655                                                      HvLpEvent_Type_VirtualLan);
656
657                 /*
658                  * Reset ack data. This prevents the ack_timer actually
659                  * doing anything, even if it runs one more time when
660                  * we drop the lock below.
661                  */
662                 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
663                 cnx->num_pending_acks = 0;
664
665                 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
666                                 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
667                                 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
668                                 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
669
670                 /* Clean up any leftover messages */
671                 if (cnx->msgs) {
672                         int i;
673                         for (i = 0; i < VETH_NUMBUFFERS; ++i)
674                                 veth_recycle_msg(cnx, cnx->msgs + i);
675                 }
676
677                 cnx->outstanding_tx = 0;
678                 veth_wake_queues(cnx);
679
680                 /* Drop the lock so we can do stuff that might sleep or
681                  * take other locks. */
682                 spin_unlock_irq(&cnx->lock);
683
684                 del_timer_sync(&cnx->ack_timer);
685                 del_timer_sync(&cnx->reset_timer);
686
687                 spin_lock_irq(&cnx->lock);
688
689                 if (cnx->state & VETH_STATE_RESET)
690                         goto restart;
691
692                 /* Hack, wait for the other end to reset itself. */
693                 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
694                         schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
695                         goto out;
696                 }
697         }
698
699         if (cnx->state & VETH_STATE_SHUTDOWN)
700                 /* It's all over, do nothing */
701                 goto out;
702
703         if ( !(cnx->state & VETH_STATE_OPEN) ) {
704                 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
705                         goto cant_cope;
706
707                 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
708                 cnx->src_inst =
709                         HvCallEvent_getSourceLpInstanceId(rlp,
710                                                           HvLpEvent_Type_VirtualLan);
711                 cnx->dst_inst =
712                         HvCallEvent_getTargetLpInstanceId(rlp,
713                                                           HvLpEvent_Type_VirtualLan);
714                 cnx->state |= VETH_STATE_OPEN;
715         }
716
717         if ( (cnx->state & VETH_STATE_OPEN) &&
718              !(cnx->state & VETH_STATE_SENTMON) ) {
719                 rc = veth_signalevent(cnx, VETH_EVENT_MONITOR,
720                                       HvLpEvent_AckInd_DoAck,
721                                       HvLpEvent_AckType_DeferredAck,
722                                       0, 0, 0, 0, 0, 0);
723
724                 if (rc == HvLpEvent_Rc_Good) {
725                         cnx->state |= VETH_STATE_SENTMON;
726                 } else {
727                         if ( (rc != HvLpEvent_Rc_PartitionDead) &&
728                              (rc != HvLpEvent_Rc_PathClosed) )
729                                 veth_error("Error sending monitor to LPAR %d, "
730                                                 "rc = %d\n", rlp, rc);
731
732                         /* Oh well, hope we get a cap from the other
733                          * end and do better when that kicks us */
734                         goto out;
735                 }
736         }
737
738         if ( (cnx->state & VETH_STATE_OPEN) &&
739              !(cnx->state & VETH_STATE_SENTCAPS)) {
740                 u64 *rawcap = (u64 *)&cnx->local_caps;
741
742                 rc = veth_signalevent(cnx, VETH_EVENT_CAP,
743                                       HvLpEvent_AckInd_DoAck,
744                                       HvLpEvent_AckType_ImmediateAck,
745                                       0, rawcap[0], rawcap[1], rawcap[2],
746                                       rawcap[3], rawcap[4]);
747
748                 if (rc == HvLpEvent_Rc_Good) {
749                         cnx->state |= VETH_STATE_SENTCAPS;
750                 } else {
751                         if ( (rc != HvLpEvent_Rc_PartitionDead) &&
752                              (rc != HvLpEvent_Rc_PathClosed) )
753                                 veth_error("Error sending caps to LPAR %d, "
754                                                 "rc = %d\n", rlp, rc);
755
756                         /* Oh well, hope we get a cap from the other
757                          * end and do better when that kicks us */
758                         goto out;
759                 }
760         }
761
762         if ((cnx->state & VETH_STATE_GOTCAPS) &&
763             !(cnx->state & VETH_STATE_SENTCAPACK)) {
764                 struct veth_cap_data *remote_caps = &cnx->remote_caps;
765
766                 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
767                        sizeof(*remote_caps));
768
769                 spin_unlock_irq(&cnx->lock);
770                 rc = veth_process_caps(cnx);
771                 spin_lock_irq(&cnx->lock);
772
773                 /* We dropped the lock, so recheck for anything which
774                  * might mess us up */
775                 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
776                         goto restart;
777
778                 cnx->cap_event.base_event.xRc = rc;
779                 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
780                 if (rc == HvLpEvent_Rc_Good)
781                         cnx->state |= VETH_STATE_SENTCAPACK;
782                 else
783                         goto cant_cope;
784         }
785
786         if ((cnx->state & VETH_STATE_GOTCAPACK) &&
787             (cnx->state & VETH_STATE_GOTCAPS) &&
788             !(cnx->state & VETH_STATE_READY)) {
789                 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
790                         /* Start the ACK timer */
791                         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
792                         add_timer(&cnx->ack_timer);
793                         cnx->state |= VETH_STATE_READY;
794                 } else {
795                         veth_error("Caps rejected by LPAR %d, rc = %d\n",
796                                         rlp, cnx->cap_ack_event.base_event.xRc);
797                         goto cant_cope;
798                 }
799         }
800
801  out:
802         spin_unlock_irq(&cnx->lock);
803         return;
804
805  cant_cope:
806         /* FIXME: we get here if something happens we really can't
807          * cope with.  The link will never work once we get here, and
808          * all we can do is not lock the rest of the system up */
809         veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
810                         " (state = 0x%04lx)\n", rlp, cnx->state);
811         cnx->state |= VETH_STATE_SHUTDOWN;
812         spin_unlock_irq(&cnx->lock);
813 }
814
815 static int veth_init_connection(u8 rlp)
816 {
817         struct veth_lpar_connection *cnx;
818         struct veth_msg *msgs;
819         int i;
820
821         if ( (rlp == this_lp) ||
822              ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
823                 return 0;
824
825         cnx = kzalloc(sizeof(*cnx), GFP_KERNEL);
826         if (! cnx)
827                 return -ENOMEM;
828
829         cnx->remote_lp = rlp;
830         spin_lock_init(&cnx->lock);
831         INIT_DELAYED_WORK(&cnx->statemachine_wq, veth_statemachine);
832
833         init_timer(&cnx->ack_timer);
834         cnx->ack_timer.function = veth_timed_ack;
835         cnx->ack_timer.data = (unsigned long) cnx;
836
837         init_timer(&cnx->reset_timer);
838         cnx->reset_timer.function = veth_timed_reset;
839         cnx->reset_timer.data = (unsigned long) cnx;
840         cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
841
842         memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
843
844         veth_cnx[rlp] = cnx;
845
846         /* This gets us 1 reference, which is held on behalf of the driver
847          * infrastructure. It's released at module unload. */
848         kobject_init(&cnx->kobject, &veth_lpar_connection_ktype);
849
850         msgs = kcalloc(VETH_NUMBUFFERS, sizeof(struct veth_msg), GFP_KERNEL);
851         if (! msgs) {
852                 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
853                 return -ENOMEM;
854         }
855
856         cnx->msgs = msgs;
857
858         for (i = 0; i < VETH_NUMBUFFERS; i++) {
859                 msgs[i].token = i;
860                 veth_stack_push(cnx, msgs + i);
861         }
862
863         cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
864
865         if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
866                 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
867                 return -ENOMEM;
868         }
869
870         cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
871         cnx->local_caps.ack_threshold = ACK_THRESHOLD;
872         cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
873
874         return 0;
875 }
876
877 static void veth_stop_connection(struct veth_lpar_connection *cnx)
878 {
879         if (!cnx)
880                 return;
881
882         spin_lock_irq(&cnx->lock);
883         cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
884         veth_kick_statemachine(cnx);
885         spin_unlock_irq(&cnx->lock);
886
887         /* There's a slim chance the reset code has just queued the
888          * statemachine to run in five seconds. If so we need to cancel
889          * that and requeue the work to run now. */
890         if (cancel_delayed_work(&cnx->statemachine_wq)) {
891                 spin_lock_irq(&cnx->lock);
892                 veth_kick_statemachine(cnx);
893                 spin_unlock_irq(&cnx->lock);
894         }
895
896         /* Wait for the state machine to run. */
897         flush_scheduled_work();
898 }
899
900 static void veth_destroy_connection(struct veth_lpar_connection *cnx)
901 {
902         if (!cnx)
903                 return;
904
905         if (cnx->num_events > 0)
906                 mf_deallocate_lp_events(cnx->remote_lp,
907                                       HvLpEvent_Type_VirtualLan,
908                                       cnx->num_events,
909                                       NULL, NULL);
910         if (cnx->num_ack_events > 0)
911                 mf_deallocate_lp_events(cnx->remote_lp,
912                                       HvLpEvent_Type_VirtualLan,
913                                       cnx->num_ack_events,
914                                       NULL, NULL);
915
916         kfree(cnx->msgs);
917         veth_cnx[cnx->remote_lp] = NULL;
918         kfree(cnx);
919 }
920
921 static void veth_release_connection(struct kobject *kobj)
922 {
923         struct veth_lpar_connection *cnx;
924         cnx = container_of(kobj, struct veth_lpar_connection, kobject);
925         veth_stop_connection(cnx);
926         veth_destroy_connection(cnx);
927 }
928
929 /*
930  * net_device code
931  */
932
933 static int veth_open(struct net_device *dev)
934 {
935         netif_start_queue(dev);
936         return 0;
937 }
938
939 static int veth_close(struct net_device *dev)
940 {
941         netif_stop_queue(dev);
942         return 0;
943 }
944
945 static int veth_change_mtu(struct net_device *dev, int new_mtu)
946 {
947         if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
948                 return -EINVAL;
949         dev->mtu = new_mtu;
950         return 0;
951 }
952
953 static void veth_set_multicast_list(struct net_device *dev)
954 {
955         struct veth_port *port = netdev_priv(dev);
956         unsigned long flags;
957
958         write_lock_irqsave(&port->mcast_gate, flags);
959
960         if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
961                         (netdev_mc_count(dev) > VETH_MAX_MCAST)) {
962                 port->promiscuous = 1;
963         } else {
964                 struct dev_mc_list *dmi;
965
966                 port->promiscuous = 0;
967
968                 /* Update table */
969                 port->num_mcast = 0;
970
971                 netdev_for_each_mc_addr(dmi, dev) {
972                         u8 *addr = dmi->dmi_addr;
973                         u64 xaddr = 0;
974
975                         if (addr[0] & 0x01) {/* multicast address? */
976                                 memcpy(&xaddr, addr, ETH_ALEN);
977                                 port->mcast_addr[port->num_mcast] = xaddr;
978                                 port->num_mcast++;
979                         }
980                 }
981         }
982
983         write_unlock_irqrestore(&port->mcast_gate, flags);
984 }
985
986 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
987 {
988         strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
989         info->driver[sizeof(info->driver) - 1] = '\0';
990         strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
991         info->version[sizeof(info->version) - 1] = '\0';
992 }
993
994 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
995 {
996         ecmd->supported = (SUPPORTED_1000baseT_Full
997                           | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
998         ecmd->advertising = (SUPPORTED_1000baseT_Full
999                             | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1000         ecmd->port = PORT_FIBRE;
1001         ecmd->transceiver = XCVR_INTERNAL;
1002         ecmd->phy_address = 0;
1003         ecmd->speed = SPEED_1000;
1004         ecmd->duplex = DUPLEX_FULL;
1005         ecmd->autoneg = AUTONEG_ENABLE;
1006         ecmd->maxtxpkt = 120;
1007         ecmd->maxrxpkt = 120;
1008         return 0;
1009 }
1010
1011 static u32 veth_get_link(struct net_device *dev)
1012 {
1013         return 1;
1014 }
1015
1016 static const struct ethtool_ops ops = {
1017         .get_drvinfo = veth_get_drvinfo,
1018         .get_settings = veth_get_settings,
1019         .get_link = veth_get_link,
1020 };
1021
1022 static const struct net_device_ops veth_netdev_ops = {
1023         .ndo_open               = veth_open,
1024         .ndo_stop               = veth_close,
1025         .ndo_start_xmit         = veth_start_xmit,
1026         .ndo_change_mtu         = veth_change_mtu,
1027         .ndo_set_multicast_list = veth_set_multicast_list,
1028         .ndo_set_mac_address    = NULL,
1029         .ndo_validate_addr      = eth_validate_addr,
1030 };
1031
1032 static struct net_device *veth_probe_one(int vlan,
1033                 struct vio_dev *vio_dev)
1034 {
1035         struct net_device *dev;
1036         struct veth_port *port;
1037         struct device *vdev = &vio_dev->dev;
1038         int i, rc;
1039         const unsigned char *mac_addr;
1040
1041         mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
1042         if (mac_addr == NULL)
1043                 mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
1044         if (mac_addr == NULL) {
1045                 veth_error("Unable to fetch MAC address from device tree.\n");
1046                 return NULL;
1047         }
1048
1049         dev = alloc_etherdev(sizeof (struct veth_port));
1050         if (! dev) {
1051                 veth_error("Unable to allocate net_device structure!\n");
1052                 return NULL;
1053         }
1054
1055         port = netdev_priv(dev);
1056
1057         spin_lock_init(&port->queue_lock);
1058         rwlock_init(&port->mcast_gate);
1059         port->stopped_map = 0;
1060
1061         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1062                 HvLpVirtualLanIndexMap map;
1063
1064                 if (i == this_lp)
1065                         continue;
1066                 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
1067                 if (map & (0x8000 >> vlan))
1068                         port->lpar_map |= (1 << i);
1069         }
1070         port->dev = vdev;
1071
1072         memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
1073
1074         dev->mtu = VETH_MAX_MTU;
1075
1076         memcpy(&port->mac_addr, mac_addr, ETH_ALEN);
1077
1078         dev->netdev_ops = &veth_netdev_ops;
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, &veth_port_ktype);
1091         if (0 != kobject_add(&port->kobject, &dev->dev.kobj, "veth_port"))
1092                 veth_error("Failed adding port for %s to sysfs.\n", dev->name);
1093
1094         veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
1095                         dev->name, vlan, port->lpar_map);
1096
1097         return dev;
1098 }
1099
1100 /*
1101  * Tx path
1102  */
1103
1104 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
1105                                 struct net_device *dev)
1106 {
1107         struct veth_lpar_connection *cnx = veth_cnx[rlp];
1108         struct veth_port *port = netdev_priv(dev);
1109         HvLpEvent_Rc rc;
1110         struct veth_msg *msg = NULL;
1111         unsigned long flags;
1112
1113         if (! cnx)
1114                 return 0;
1115
1116         spin_lock_irqsave(&cnx->lock, flags);
1117
1118         if (! (cnx->state & VETH_STATE_READY))
1119                 goto no_error;
1120
1121         if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
1122                 goto drop;
1123
1124         msg = veth_stack_pop(cnx);
1125         if (! msg)
1126                 goto drop;
1127
1128         msg->in_use = 1;
1129         msg->skb = skb_get(skb);
1130
1131         msg->data.addr[0] = dma_map_single(port->dev, skb->data,
1132                                 skb->len, DMA_TO_DEVICE);
1133
1134         if (dma_mapping_error(port->dev, msg->data.addr[0]))
1135                 goto recycle_and_drop;
1136
1137         msg->dev = port->dev;
1138         msg->data.len[0] = skb->len;
1139         msg->data.eofmask = 1 << VETH_EOF_SHIFT;
1140
1141         rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
1142
1143         if (rc != HvLpEvent_Rc_Good)
1144                 goto recycle_and_drop;
1145
1146         /* If the timer's not already running, start it now. */
1147         if (0 == cnx->outstanding_tx)
1148                 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
1149
1150         cnx->last_contact = jiffies;
1151         cnx->outstanding_tx++;
1152
1153         if (veth_stack_is_empty(cnx))
1154                 veth_stop_queues(cnx);
1155
1156  no_error:
1157         spin_unlock_irqrestore(&cnx->lock, flags);
1158         return 0;
1159
1160  recycle_and_drop:
1161         veth_recycle_msg(cnx, msg);
1162  drop:
1163         spin_unlock_irqrestore(&cnx->lock, flags);
1164         return 1;
1165 }
1166
1167 static void veth_transmit_to_many(struct sk_buff *skb,
1168                                           HvLpIndexMap lpmask,
1169                                           struct net_device *dev)
1170 {
1171         int i, success, error;
1172
1173         success = error = 0;
1174
1175         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1176                 if ((lpmask & (1 << i)) == 0)
1177                         continue;
1178
1179                 if (veth_transmit_to_one(skb, i, dev))
1180                         error = 1;
1181                 else
1182                         success = 1;
1183         }
1184
1185         if (error)
1186                 dev->stats.tx_errors++;
1187
1188         if (success) {
1189                 dev->stats.tx_packets++;
1190                 dev->stats.tx_bytes += skb->len;
1191         }
1192 }
1193
1194 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1195 {
1196         unsigned char *frame = skb->data;
1197         struct veth_port *port = netdev_priv(dev);
1198         HvLpIndexMap lpmask;
1199
1200         if (! (frame[0] & 0x01)) {
1201                 /* unicast packet */
1202                 HvLpIndex rlp = frame[5];
1203
1204                 if ( ! ((1 << rlp) & port->lpar_map) ) {
1205                         dev_kfree_skb(skb);
1206                         return NETDEV_TX_OK;
1207                 }
1208
1209                 lpmask = 1 << rlp;
1210         } else {
1211                 lpmask = port->lpar_map;
1212         }
1213
1214         veth_transmit_to_many(skb, lpmask, dev);
1215
1216         dev_kfree_skb(skb);
1217
1218         return NETDEV_TX_OK;
1219 }
1220
1221 /* You must hold the connection's lock when you call this function. */
1222 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1223                              struct veth_msg *msg)
1224 {
1225         u32 dma_address, dma_length;
1226
1227         if (msg->in_use) {
1228                 msg->in_use = 0;
1229                 dma_address = msg->data.addr[0];
1230                 dma_length = msg->data.len[0];
1231
1232                 if (!dma_mapping_error(msg->dev, dma_address))
1233                         dma_unmap_single(msg->dev, dma_address, dma_length,
1234                                         DMA_TO_DEVICE);
1235
1236                 if (msg->skb) {
1237                         dev_kfree_skb_any(msg->skb);
1238                         msg->skb = NULL;
1239                 }
1240
1241                 memset(&msg->data, 0, sizeof(msg->data));
1242                 veth_stack_push(cnx, msg);
1243         } else if (cnx->state & VETH_STATE_OPEN) {
1244                 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1245                                 cnx->remote_lp, msg->token);
1246         }
1247 }
1248
1249 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1250 {
1251         int i;
1252
1253         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1254                 struct net_device *dev = veth_dev[i];
1255                 struct veth_port *port;
1256                 unsigned long flags;
1257
1258                 if (! dev)
1259                         continue;
1260
1261                 port = netdev_priv(dev);
1262
1263                 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1264                         continue;
1265
1266                 spin_lock_irqsave(&port->queue_lock, flags);
1267
1268                 port->stopped_map &= ~(1 << cnx->remote_lp);
1269
1270                 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1271                         veth_debug("cnx %d: woke queue for %s.\n",
1272                                         cnx->remote_lp, dev->name);
1273                         netif_wake_queue(dev);
1274                 }
1275                 spin_unlock_irqrestore(&port->queue_lock, flags);
1276         }
1277 }
1278
1279 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1280 {
1281         int i;
1282
1283         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1284                 struct net_device *dev = veth_dev[i];
1285                 struct veth_port *port;
1286
1287                 if (! dev)
1288                         continue;
1289
1290                 port = netdev_priv(dev);
1291
1292                 /* If this cnx is not on the vlan for this port, continue */
1293                 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1294                         continue;
1295
1296                 spin_lock(&port->queue_lock);
1297
1298                 netif_stop_queue(dev);
1299                 port->stopped_map |= (1 << cnx->remote_lp);
1300
1301                 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1302                                 cnx->remote_lp, dev->name, port->stopped_map);
1303
1304                 spin_unlock(&port->queue_lock);
1305         }
1306 }
1307
1308 static void veth_timed_reset(unsigned long ptr)
1309 {
1310         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1311         unsigned long trigger_time, flags;
1312
1313         /* FIXME is it possible this fires after veth_stop_connection()?
1314          * That would reschedule the statemachine for 5 seconds and probably
1315          * execute it after the module's been unloaded. Hmm. */
1316
1317         spin_lock_irqsave(&cnx->lock, flags);
1318
1319         if (cnx->outstanding_tx > 0) {
1320                 trigger_time = cnx->last_contact + cnx->reset_timeout;
1321
1322                 if (trigger_time < jiffies) {
1323                         cnx->state |= VETH_STATE_RESET;
1324                         veth_kick_statemachine(cnx);
1325                         veth_error("%d packets not acked by LPAR %d within %d "
1326                                         "seconds, resetting.\n",
1327                                         cnx->outstanding_tx, cnx->remote_lp,
1328                                         cnx->reset_timeout / HZ);
1329                 } else {
1330                         /* Reschedule the timer */
1331                         trigger_time = jiffies + cnx->reset_timeout;
1332                         mod_timer(&cnx->reset_timer, trigger_time);
1333                 }
1334         }
1335
1336         spin_unlock_irqrestore(&cnx->lock, flags);
1337 }
1338
1339 /*
1340  * Rx path
1341  */
1342
1343 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1344 {
1345         int wanted = 0;
1346         int i;
1347         unsigned long flags;
1348
1349         if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1350                 return 1;
1351
1352         read_lock_irqsave(&port->mcast_gate, flags);
1353
1354         if (port->promiscuous) {
1355                 wanted = 1;
1356                 goto out;
1357         }
1358
1359         for (i = 0; i < port->num_mcast; ++i) {
1360                 if (port->mcast_addr[i] == mac_addr) {
1361                         wanted = 1;
1362                         break;
1363                 }
1364         }
1365
1366  out:
1367         read_unlock_irqrestore(&port->mcast_gate, flags);
1368
1369         return wanted;
1370 }
1371
1372 struct dma_chunk {
1373         u64 addr;
1374         u64 size;
1375 };
1376
1377 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1378
1379 static inline void veth_build_dma_list(struct dma_chunk *list,
1380                                        unsigned char *p, unsigned long length)
1381 {
1382         unsigned long done;
1383         int i = 1;
1384
1385         /* FIXME: skbs are contiguous in real addresses.  Do we
1386          * really need to break it into PAGE_SIZE chunks, or can we do
1387          * it just at the granularity of iSeries real->absolute
1388          * mapping?  Indeed, given the way the allocator works, can we
1389          * count on them being absolutely contiguous? */
1390         list[0].addr = iseries_hv_addr(p);
1391         list[0].size = min(length,
1392                            PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1393
1394         done = list[0].size;
1395         while (done < length) {
1396                 list[i].addr = iseries_hv_addr(p + done);
1397                 list[i].size = min(length-done, PAGE_SIZE);
1398                 done += list[i].size;
1399                 i++;
1400         }
1401 }
1402
1403 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1404 {
1405         HvLpEvent_Rc rc;
1406
1407         rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
1408                              0, &cnx->pending_acks);
1409
1410         if (rc != HvLpEvent_Rc_Good)
1411                 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1412                                 cnx->remote_lp, (int)rc);
1413
1414         cnx->num_pending_acks = 0;
1415         memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1416 }
1417
1418 static void veth_receive(struct veth_lpar_connection *cnx,
1419                          struct veth_lpevent *event)
1420 {
1421         struct veth_frames_data *senddata = &event->u.frames_data;
1422         int startchunk = 0;
1423         int nchunks;
1424         unsigned long flags;
1425         HvLpDma_Rc rc;
1426
1427         do {
1428                 u16 length = 0;
1429                 struct sk_buff *skb;
1430                 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1431                 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1432                 u64 dest;
1433                 HvLpVirtualLanIndex vlan;
1434                 struct net_device *dev;
1435                 struct veth_port *port;
1436
1437                 /* FIXME: do we need this? */
1438                 memset(local_list, 0, sizeof(local_list));
1439                 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1440
1441                 /* a 0 address marks the end of the valid entries */
1442                 if (senddata->addr[startchunk] == 0)
1443                         break;
1444
1445                 /* make sure that we have at least 1 EOF entry in the
1446                  * remaining entries */
1447                 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1448                         veth_error("Missing EOF fragment in event "
1449                                         "eofmask = 0x%x startchunk = %d\n",
1450                                         (unsigned)senddata->eofmask,
1451                                         startchunk);
1452                         break;
1453                 }
1454
1455                 /* build list of chunks in this frame */
1456                 nchunks = 0;
1457                 do {
1458                         remote_list[nchunks].addr =
1459                                 (u64) senddata->addr[startchunk+nchunks] << 32;
1460                         remote_list[nchunks].size =
1461                                 senddata->len[startchunk+nchunks];
1462                         length += remote_list[nchunks].size;
1463                 } while (! (senddata->eofmask &
1464                             (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1465
1466                 /* length == total length of all chunks */
1467                 /* nchunks == # of chunks in this frame */
1468
1469                 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1470                         veth_error("Received oversize frame from LPAR %d "
1471                                         "(length = %d)\n",
1472                                         cnx->remote_lp, length);
1473                         continue;
1474                 }
1475
1476                 skb = alloc_skb(length, GFP_ATOMIC);
1477                 if (!skb)
1478                         continue;
1479
1480                 veth_build_dma_list(local_list, skb->data, length);
1481
1482                 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1483                                             event->base_event.xSourceLp,
1484                                             HvLpDma_Direction_RemoteToLocal,
1485                                             cnx->src_inst,
1486                                             cnx->dst_inst,
1487                                             HvLpDma_AddressType_RealAddress,
1488                                             HvLpDma_AddressType_TceIndex,
1489                                             iseries_hv_addr(&local_list),
1490                                             iseries_hv_addr(&remote_list),
1491                                             length);
1492                 if (rc != HvLpDma_Rc_Good) {
1493                         dev_kfree_skb_irq(skb);
1494                         continue;
1495                 }
1496
1497                 vlan = skb->data[9];
1498                 dev = veth_dev[vlan];
1499                 if (! dev) {
1500                         /*
1501                          * Some earlier versions of the driver sent
1502                          * broadcasts down all connections, even to lpars
1503                          * that weren't on the relevant vlan. So ignore
1504                          * packets belonging to a vlan we're not on.
1505                          * We can also be here if we receive packets while
1506                          * the driver is going down, because then dev is NULL.
1507                          */
1508                         dev_kfree_skb_irq(skb);
1509                         continue;
1510                 }
1511
1512                 port = netdev_priv(dev);
1513                 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1514
1515                 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1516                         dev_kfree_skb_irq(skb);
1517                         continue;
1518                 }
1519                 if (! veth_frame_wanted(port, dest)) {
1520                         dev_kfree_skb_irq(skb);
1521                         continue;
1522                 }
1523
1524                 skb_put(skb, length);
1525                 skb->protocol = eth_type_trans(skb, dev);
1526                 skb->ip_summed = CHECKSUM_NONE;
1527                 netif_rx(skb);  /* send it up */
1528                 dev->stats.rx_packets++;
1529                 dev->stats.rx_bytes += length;
1530         } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1531
1532         /* Ack it */
1533         spin_lock_irqsave(&cnx->lock, flags);
1534         BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1535
1536         cnx->pending_acks[cnx->num_pending_acks++] =
1537                 event->base_event.xCorrelationToken;
1538
1539         if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold) ||
1540              (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1541                 veth_flush_acks(cnx);
1542
1543         spin_unlock_irqrestore(&cnx->lock, flags);
1544 }
1545
1546 static void veth_timed_ack(unsigned long ptr)
1547 {
1548         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1549         unsigned long flags;
1550
1551         /* Ack all the events */
1552         spin_lock_irqsave(&cnx->lock, flags);
1553         if (cnx->num_pending_acks > 0)
1554                 veth_flush_acks(cnx);
1555
1556         /* Reschedule the timer */
1557         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1558         add_timer(&cnx->ack_timer);
1559         spin_unlock_irqrestore(&cnx->lock, flags);
1560 }
1561
1562 static int veth_remove(struct vio_dev *vdev)
1563 {
1564         struct veth_lpar_connection *cnx;
1565         struct net_device *dev;
1566         struct veth_port *port;
1567         int i;
1568
1569         dev = veth_dev[vdev->unit_address];
1570
1571         if (! dev)
1572                 return 0;
1573
1574         port = netdev_priv(dev);
1575
1576         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1577                 cnx = veth_cnx[i];
1578
1579                 if (cnx && (port->lpar_map & (1 << i))) {
1580                         /* Drop our reference to connections on our VLAN */
1581                         kobject_put(&cnx->kobject);
1582                 }
1583         }
1584
1585         veth_dev[vdev->unit_address] = NULL;
1586         kobject_del(&port->kobject);
1587         kobject_put(&port->kobject);
1588         unregister_netdev(dev);
1589         free_netdev(dev);
1590
1591         return 0;
1592 }
1593
1594 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1595 {
1596         int i = vdev->unit_address;
1597         struct net_device *dev;
1598         struct veth_port *port;
1599
1600         dev = veth_probe_one(i, vdev);
1601         if (dev == NULL) {
1602                 veth_remove(vdev);
1603                 return 1;
1604         }
1605         veth_dev[i] = dev;
1606
1607         port = (struct veth_port*)netdev_priv(dev);
1608
1609         /* Start the state machine on each connection on this vlan. If we're
1610          * the first dev to do so this will commence link negotiation */
1611         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1612                 struct veth_lpar_connection *cnx;
1613
1614                 if (! (port->lpar_map & (1 << i)))
1615                         continue;
1616
1617                 cnx = veth_cnx[i];
1618                 if (!cnx)
1619                         continue;
1620
1621                 kobject_get(&cnx->kobject);
1622                 veth_kick_statemachine(cnx);
1623         }
1624
1625         return 0;
1626 }
1627
1628 /**
1629  * veth_device_table: Used by vio.c to match devices that we
1630  * support.
1631  */
1632 static struct vio_device_id veth_device_table[] __devinitdata = {
1633         { "network", "IBM,iSeries-l-lan" },
1634         { "", "" }
1635 };
1636 MODULE_DEVICE_TABLE(vio, veth_device_table);
1637
1638 static struct vio_driver veth_driver = {
1639         .id_table = veth_device_table,
1640         .probe = veth_probe,
1641         .remove = veth_remove,
1642         .driver = {
1643                 .name = DRV_NAME,
1644                 .owner = THIS_MODULE,
1645         }
1646 };
1647
1648 /*
1649  * Module initialization/cleanup
1650  */
1651
1652 static void __exit veth_module_cleanup(void)
1653 {
1654         int i;
1655         struct veth_lpar_connection *cnx;
1656
1657         /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1658         HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1659
1660         /* Make sure any work queued from Hypervisor callbacks is finished. */
1661         flush_scheduled_work();
1662
1663         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1664                 cnx = veth_cnx[i];
1665
1666                 if (!cnx)
1667                         continue;
1668
1669                 /* Remove the connection from sysfs */
1670                 kobject_del(&cnx->kobject);
1671                 /* Drop the driver's reference to the connection */
1672                 kobject_put(&cnx->kobject);
1673         }
1674
1675         /* Unregister the driver, which will close all the netdevs and stop
1676          * the connections when they're no longer referenced. */
1677         vio_unregister_driver(&veth_driver);
1678 }
1679 module_exit(veth_module_cleanup);
1680
1681 static int __init veth_module_init(void)
1682 {
1683         int i;
1684         int rc;
1685
1686         if (!firmware_has_feature(FW_FEATURE_ISERIES))
1687                 return -ENODEV;
1688
1689         this_lp = HvLpConfig_getLpIndex_outline();
1690
1691         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1692                 rc = veth_init_connection(i);
1693                 if (rc != 0)
1694                         goto error;
1695         }
1696
1697         HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1698                                   &veth_handle_event);
1699
1700         rc = vio_register_driver(&veth_driver);
1701         if (rc != 0)
1702                 goto error;
1703
1704         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1705                 struct kobject *kobj;
1706
1707                 if (!veth_cnx[i])
1708                         continue;
1709
1710                 kobj = &veth_cnx[i]->kobject;
1711                 /* If the add failes, complain but otherwise continue */
1712                 if (0 != driver_add_kobj(&veth_driver.driver, kobj,
1713                                         "cnx%.2d", veth_cnx[i]->remote_lp))
1714                         veth_error("cnx %d: Failed adding to sysfs.\n", i);
1715         }
1716
1717         return 0;
1718
1719 error:
1720         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1721                 veth_destroy_connection(veth_cnx[i]);
1722         }
1723
1724         return rc;
1725 }
1726 module_init(veth_module_init);