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