[PATCH] iseries_veth: Add sysfs support for port structs
[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  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of the
11  * License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21  * USA
22  *
23  *
24  * This module implements the virtual ethernet device for iSeries LPAR
25  * Linux.  It uses hypervisor message passing to implement an
26  * ethernet-like network device communicating between partitions on
27  * the iSeries.
28  *
29  * The iSeries LPAR hypervisor currently allows for up to 16 different
30  * virtual ethernets.  These are all dynamically configurable on
31  * OS/400 partitions, but dynamic configuration is not supported under
32  * Linux yet.  An ethXX network device will be created for each
33  * virtual ethernet this partition is connected to.
34  *
35  * - This driver is responsible for routing packets to and from other
36  *   partitions.  The MAC addresses used by the virtual ethernets
37  *   contains meaning and must not be modified.
38  *
39  * - Having 2 virtual ethernets to the same remote partition DOES NOT
40  *   double the available bandwidth.  The 2 devices will share the
41  *   available hypervisor bandwidth.
42  *
43  * - If you send a packet to your own mac address, it will just be
44  *   dropped, you won't get it on the receive side.
45  *
46  * - Multicast is implemented by sending the frame frame to every
47  *   other partition.  It is the responsibility of the receiving
48  *   partition to filter the addresses desired.
49  *
50  * Tunable parameters:
51  *
52  * VETH_NUMBUFFERS: This compile time option defaults to 120.  It
53  * controls how much memory Linux will allocate per remote partition
54  * it is communicating with.  It can be thought of as the maximum
55  * number of packets outstanding to a remote partition at a time.
56  */
57
58 #include <linux/config.h>
59 #include <linux/module.h>
60 #include <linux/version.h>
61 #include <linux/types.h>
62 #include <linux/errno.h>
63 #include <linux/ioport.h>
64 #include <linux/kernel.h>
65 #include <linux/netdevice.h>
66 #include <linux/etherdevice.h>
67 #include <linux/skbuff.h>
68 #include <linux/init.h>
69 #include <linux/delay.h>
70 #include <linux/mm.h>
71 #include <linux/ethtool.h>
72 #include <asm/iSeries/mf.h>
73 #include <asm/iSeries/iSeries_pci.h>
74 #include <asm/uaccess.h>
75
76 #include <asm/iSeries/HvLpConfig.h>
77 #include <asm/iSeries/HvTypes.h>
78 #include <asm/iSeries/HvLpEvent.h>
79 #include <asm/iommu.h>
80 #include <asm/vio.h>
81
82 #undef DEBUG
83
84 #include "iseries_veth.h"
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_NUMBUFFERS         (120)
91 #define VETH_ACKTIMEOUT         (1000000) /* microseconds */
92 #define VETH_MAX_MCAST          (12)
93
94 #define VETH_MAX_MTU            (9000)
95
96 #if VETH_NUMBUFFERS < 10
97 #define ACK_THRESHOLD           (1)
98 #elif VETH_NUMBUFFERS < 20
99 #define ACK_THRESHOLD           (4)
100 #elif VETH_NUMBUFFERS < 40
101 #define ACK_THRESHOLD           (10)
102 #else
103 #define ACK_THRESHOLD           (20)
104 #endif
105
106 #define VETH_STATE_SHUTDOWN     (0x0001)
107 #define VETH_STATE_OPEN         (0x0002)
108 #define VETH_STATE_RESET        (0x0004)
109 #define VETH_STATE_SENTMON      (0x0008)
110 #define VETH_STATE_SENTCAPS     (0x0010)
111 #define VETH_STATE_GOTCAPACK    (0x0020)
112 #define VETH_STATE_GOTCAPS      (0x0040)
113 #define VETH_STATE_SENTCAPACK   (0x0080)
114 #define VETH_STATE_READY        (0x0100)
115
116 struct veth_msg {
117         struct veth_msg *next;
118         struct VethFramesData data;
119         int token;
120         int in_use;
121         struct sk_buff *skb;
122         struct device *dev;
123 };
124
125 struct veth_lpar_connection {
126         HvLpIndex remote_lp;
127         struct work_struct statemachine_wq;
128         struct veth_msg *msgs;
129         int num_events;
130         struct VethCapData local_caps;
131
132         struct kobject kobject;
133         struct timer_list ack_timer;
134
135         struct timer_list reset_timer;
136         unsigned int reset_timeout;
137         unsigned long last_contact;
138         int outstanding_tx;
139
140         spinlock_t lock;
141         unsigned long state;
142         HvLpInstanceId src_inst;
143         HvLpInstanceId dst_inst;
144         struct VethLpEvent cap_event, cap_ack_event;
145         u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
146         u32 num_pending_acks;
147
148         int num_ack_events;
149         struct VethCapData remote_caps;
150         u32 ack_timeout;
151
152         struct veth_msg *msg_stack_head;
153 };
154
155 struct veth_port {
156         struct device *dev;
157         struct net_device_stats stats;
158         u64 mac_addr;
159         HvLpIndexMap lpar_map;
160
161         /* queue_lock protects the stopped_map and dev's queue. */
162         spinlock_t queue_lock;
163         HvLpIndexMap stopped_map;
164
165         /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
166         rwlock_t mcast_gate;
167         int promiscuous;
168         int num_mcast;
169         u64 mcast_addr[VETH_MAX_MCAST];
170
171         struct kobject kobject;
172 };
173
174 static HvLpIndex this_lp;
175 static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
176 static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
177
178 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
179 static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
180 static void veth_wake_queues(struct veth_lpar_connection *cnx);
181 static void veth_stop_queues(struct veth_lpar_connection *cnx);
182 static void veth_receive(struct veth_lpar_connection *, struct VethLpEvent *);
183 static void veth_release_connection(struct kobject *kobject);
184 static void veth_timed_ack(unsigned long ptr);
185 static void veth_timed_reset(unsigned long ptr);
186
187 /*
188  * Utility functions
189  */
190
191 #define veth_info(fmt, args...) \
192         printk(KERN_INFO "iseries_veth: " fmt, ## args)
193
194 #define veth_error(fmt, args...) \
195         printk(KERN_ERR "iseries_veth: Error: " fmt, ## args)
196
197 #ifdef DEBUG
198 #define veth_debug(fmt, args...) \
199         printk(KERN_DEBUG "iseries_veth: " fmt, ## args)
200 #else
201 #define veth_debug(fmt, args...) do {} while (0)
202 #endif
203
204 /* You must hold the connection's lock when you call this function. */
205 static inline void veth_stack_push(struct veth_lpar_connection *cnx,
206                                    struct veth_msg *msg)
207 {
208         msg->next = cnx->msg_stack_head;
209         cnx->msg_stack_head = msg;
210 }
211
212 /* You must hold the connection's lock when you call this function. */
213 static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
214 {
215         struct veth_msg *msg;
216
217         msg = cnx->msg_stack_head;
218         if (msg)
219                 cnx->msg_stack_head = cnx->msg_stack_head->next;
220
221         return msg;
222 }
223
224 /* You must hold the connection's lock when you call this function. */
225 static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
226 {
227         return cnx->msg_stack_head == NULL;
228 }
229
230 static inline HvLpEvent_Rc
231 veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
232                  HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
233                  u64 token,
234                  u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
235 {
236         return HvCallEvent_signalLpEventFast(cnx->remote_lp,
237                                              HvLpEvent_Type_VirtualLan,
238                                              subtype, ackind, acktype,
239                                              cnx->src_inst,
240                                              cnx->dst_inst,
241                                              token, data1, data2, data3,
242                                              data4, data5);
243 }
244
245 static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
246                                            u16 subtype, u64 token, void *data)
247 {
248         u64 *p = (u64 *) data;
249
250         return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
251                                 HvLpEvent_AckType_ImmediateAck,
252                                 token, p[0], p[1], p[2], p[3], p[4]);
253 }
254
255 struct veth_allocation {
256         struct completion c;
257         int num;
258 };
259
260 static void veth_complete_allocation(void *parm, int number)
261 {
262         struct veth_allocation *vc = (struct veth_allocation *)parm;
263
264         vc->num = number;
265         complete(&vc->c);
266 }
267
268 static int veth_allocate_events(HvLpIndex rlp, int number)
269 {
270         struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
271
272         mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
273                             sizeof(struct VethLpEvent), number,
274                             &veth_complete_allocation, &vc);
275         wait_for_completion(&vc.c);
276
277         return vc.num;
278 }
279
280 /*
281  * sysfs support
282  */
283
284 struct veth_cnx_attribute {
285         struct attribute attr;
286         ssize_t (*show)(struct veth_lpar_connection *, char *buf);
287         ssize_t (*store)(struct veth_lpar_connection *, const char *buf);
288 };
289
290 static ssize_t veth_cnx_attribute_show(struct kobject *kobj,
291                 struct attribute *attr, char *buf)
292 {
293         struct veth_cnx_attribute *cnx_attr;
294         struct veth_lpar_connection *cnx;
295
296         cnx_attr = container_of(attr, struct veth_cnx_attribute, attr);
297         cnx = container_of(kobj, struct veth_lpar_connection, kobject);
298
299         if (!cnx_attr->show)
300                 return -EIO;
301
302         return cnx_attr->show(cnx, buf);
303 }
304
305 #define CUSTOM_CNX_ATTR(_name, _format, _expression)                    \
306 static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\
307 {                                                                       \
308         return sprintf(buf, _format, _expression);                      \
309 }                                                                       \
310 struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name)
311
312 #define SIMPLE_CNX_ATTR(_name)  \
313         CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name)
314
315 SIMPLE_CNX_ATTR(outstanding_tx);
316 SIMPLE_CNX_ATTR(remote_lp);
317 SIMPLE_CNX_ATTR(num_events);
318 SIMPLE_CNX_ATTR(src_inst);
319 SIMPLE_CNX_ATTR(dst_inst);
320 SIMPLE_CNX_ATTR(num_pending_acks);
321 SIMPLE_CNX_ATTR(num_ack_events);
322 CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout));
323 CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout));
324 CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state);
325 CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ?
326                 jiffies_to_msecs(jiffies - cnx->last_contact) : 0);
327
328 #define GET_CNX_ATTR(_name)     (&veth_cnx_attr_##_name.attr)
329
330 static struct attribute *veth_cnx_default_attrs[] = {
331         GET_CNX_ATTR(outstanding_tx),
332         GET_CNX_ATTR(remote_lp),
333         GET_CNX_ATTR(num_events),
334         GET_CNX_ATTR(reset_timeout),
335         GET_CNX_ATTR(last_contact),
336         GET_CNX_ATTR(state),
337         GET_CNX_ATTR(src_inst),
338         GET_CNX_ATTR(dst_inst),
339         GET_CNX_ATTR(num_pending_acks),
340         GET_CNX_ATTR(num_ack_events),
341         GET_CNX_ATTR(ack_timeout),
342         NULL
343 };
344
345 static struct sysfs_ops veth_cnx_sysfs_ops = {
346                 .show = veth_cnx_attribute_show
347 };
348
349 static struct kobj_type veth_lpar_connection_ktype = {
350         .release        = veth_release_connection,
351         .sysfs_ops      = &veth_cnx_sysfs_ops,
352         .default_attrs  = veth_cnx_default_attrs
353 };
354
355 struct veth_port_attribute {
356         struct attribute attr;
357         ssize_t (*show)(struct veth_port *, char *buf);
358         ssize_t (*store)(struct veth_port *, const char *buf);
359 };
360
361 static ssize_t veth_port_attribute_show(struct kobject *kobj,
362                 struct attribute *attr, char *buf)
363 {
364         struct veth_port_attribute *port_attr;
365         struct veth_port *port;
366
367         port_attr = container_of(attr, struct veth_port_attribute, attr);
368         port = container_of(kobj, struct veth_port, kobject);
369
370         if (!port_attr->show)
371                 return -EIO;
372
373         return port_attr->show(port, buf);
374 }
375
376 #define CUSTOM_PORT_ATTR(_name, _format, _expression)                   \
377 static ssize_t _name##_show(struct veth_port *port, char *buf)          \
378 {                                                                       \
379         return sprintf(buf, _format, _expression);                      \
380 }                                                                       \
381 struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name)
382
383 #define SIMPLE_PORT_ATTR(_name) \
384         CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name)
385
386 SIMPLE_PORT_ATTR(promiscuous);
387 SIMPLE_PORT_ATTR(num_mcast);
388 CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map);
389 CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map);
390 CUSTOM_PORT_ATTR(mac_addr, "0x%lX\n", port->mac_addr);
391
392 #define GET_PORT_ATTR(_name)    (&veth_port_attr_##_name.attr)
393 static struct attribute *veth_port_default_attrs[] = {
394         GET_PORT_ATTR(mac_addr),
395         GET_PORT_ATTR(lpar_map),
396         GET_PORT_ATTR(stopped_map),
397         GET_PORT_ATTR(promiscuous),
398         GET_PORT_ATTR(num_mcast),
399         NULL
400 };
401
402 static struct sysfs_ops veth_port_sysfs_ops = {
403         .show = veth_port_attribute_show
404 };
405
406 static struct kobj_type veth_port_ktype = {
407         .sysfs_ops      = &veth_port_sysfs_ops,
408         .default_attrs  = veth_port_default_attrs
409 };
410
411 /*
412  * LPAR connection code
413  */
414
415 static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
416 {
417         schedule_work(&cnx->statemachine_wq);
418 }
419
420 static void veth_take_cap(struct veth_lpar_connection *cnx,
421                           struct VethLpEvent *event)
422 {
423         unsigned long flags;
424
425         spin_lock_irqsave(&cnx->lock, flags);
426         /* Receiving caps may mean the other end has just come up, so
427          * we need to reload the instance ID of the far end */
428         cnx->dst_inst =
429                 HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
430                                                   HvLpEvent_Type_VirtualLan);
431
432         if (cnx->state & VETH_STATE_GOTCAPS) {
433                 veth_error("Received a second capabilities from LPAR %d.\n",
434                            cnx->remote_lp);
435                 event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
436                 HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
437         } else {
438                 memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
439                 cnx->state |= VETH_STATE_GOTCAPS;
440                 veth_kick_statemachine(cnx);
441         }
442         spin_unlock_irqrestore(&cnx->lock, flags);
443 }
444
445 static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
446                               struct VethLpEvent *event)
447 {
448         unsigned long flags;
449
450         spin_lock_irqsave(&cnx->lock, flags);
451         if (cnx->state & VETH_STATE_GOTCAPACK) {
452                 veth_error("Received a second capabilities ack from LPAR %d.\n",
453                            cnx->remote_lp);
454         } else {
455                 memcpy(&cnx->cap_ack_event, event,
456                        sizeof(&cnx->cap_ack_event));
457                 cnx->state |= VETH_STATE_GOTCAPACK;
458                 veth_kick_statemachine(cnx);
459         }
460         spin_unlock_irqrestore(&cnx->lock, flags);
461 }
462
463 static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
464                                   struct VethLpEvent *event)
465 {
466         unsigned long flags;
467
468         spin_lock_irqsave(&cnx->lock, flags);
469         veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
470
471         /* Avoid kicking the statemachine once we're shutdown.
472          * It's unnecessary and it could break veth_stop_connection(). */
473
474         if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
475                 cnx->state |= VETH_STATE_RESET;
476                 veth_kick_statemachine(cnx);
477         }
478         spin_unlock_irqrestore(&cnx->lock, flags);
479 }
480
481 static void veth_handle_ack(struct VethLpEvent *event)
482 {
483         HvLpIndex rlp = event->base_event.xTargetLp;
484         struct veth_lpar_connection *cnx = veth_cnx[rlp];
485
486         BUG_ON(! cnx);
487
488         switch (event->base_event.xSubtype) {
489         case VethEventTypeCap:
490                 veth_take_cap_ack(cnx, event);
491                 break;
492         case VethEventTypeMonitor:
493                 veth_take_monitor_ack(cnx, event);
494                 break;
495         default:
496                 veth_error("Unknown ack type %d from LPAR %d.\n",
497                                 event->base_event.xSubtype, rlp);
498         };
499 }
500
501 static void veth_handle_int(struct VethLpEvent *event)
502 {
503         HvLpIndex rlp = event->base_event.xSourceLp;
504         struct veth_lpar_connection *cnx = veth_cnx[rlp];
505         unsigned long flags;
506         int i, acked = 0;
507
508         BUG_ON(! cnx);
509
510         switch (event->base_event.xSubtype) {
511         case VethEventTypeCap:
512                 veth_take_cap(cnx, event);
513                 break;
514         case VethEventTypeMonitor:
515                 /* do nothing... this'll hang out here til we're dead,
516                  * and the hypervisor will return it for us. */
517                 break;
518         case VethEventTypeFramesAck:
519                 spin_lock_irqsave(&cnx->lock, flags);
520
521                 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
522                         u16 msgnum = event->u.frames_ack_data.token[i];
523
524                         if (msgnum < VETH_NUMBUFFERS) {
525                                 veth_recycle_msg(cnx, cnx->msgs + msgnum);
526                                 cnx->outstanding_tx--;
527                                 acked++;
528                         }
529                 }
530
531                 if (acked > 0) {
532                         cnx->last_contact = jiffies;
533                         veth_wake_queues(cnx);
534                 }
535
536                 spin_unlock_irqrestore(&cnx->lock, flags);
537                 break;
538         case VethEventTypeFrames:
539                 veth_receive(cnx, event);
540                 break;
541         default:
542                 veth_error("Unknown interrupt type %d from LPAR %d.\n",
543                                 event->base_event.xSubtype, rlp);
544         };
545 }
546
547 static void veth_handle_event(struct HvLpEvent *event, struct pt_regs *regs)
548 {
549         struct VethLpEvent *veth_event = (struct VethLpEvent *)event;
550
551         if (event->xFlags.xFunction == HvLpEvent_Function_Ack)
552                 veth_handle_ack(veth_event);
553         else if (event->xFlags.xFunction == HvLpEvent_Function_Int)
554                 veth_handle_int(veth_event);
555 }
556
557 static int veth_process_caps(struct veth_lpar_connection *cnx)
558 {
559         struct VethCapData *remote_caps = &cnx->remote_caps;
560         int num_acks_needed;
561
562         /* Convert timer to jiffies */
563         cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
564
565         if ( (remote_caps->num_buffers == 0)
566              || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
567              || (remote_caps->ack_threshold == 0)
568              || (cnx->ack_timeout == 0) ) {
569                 veth_error("Received incompatible capabilities from LPAR %d.\n",
570                                 cnx->remote_lp);
571                 return HvLpEvent_Rc_InvalidSubtypeData;
572         }
573
574         num_acks_needed = (remote_caps->num_buffers
575                            / remote_caps->ack_threshold) + 1;
576
577         /* FIXME: locking on num_ack_events? */
578         if (cnx->num_ack_events < num_acks_needed) {
579                 int num;
580
581                 num = veth_allocate_events(cnx->remote_lp,
582                                            num_acks_needed-cnx->num_ack_events);
583                 if (num > 0)
584                         cnx->num_ack_events += num;
585
586                 if (cnx->num_ack_events < num_acks_needed) {
587                         veth_error("Couldn't allocate enough ack events "
588                                         "for LPAR %d.\n", cnx->remote_lp);
589
590                         return HvLpEvent_Rc_BufferNotAvailable;
591                 }
592         }
593
594
595         return HvLpEvent_Rc_Good;
596 }
597
598 /* FIXME: The gotos here are a bit dubious */
599 static void veth_statemachine(void *p)
600 {
601         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)p;
602         int rlp = cnx->remote_lp;
603         int rc;
604
605         spin_lock_irq(&cnx->lock);
606
607  restart:
608         if (cnx->state & VETH_STATE_RESET) {
609                 if (cnx->state & VETH_STATE_OPEN)
610                         HvCallEvent_closeLpEventPath(cnx->remote_lp,
611                                                      HvLpEvent_Type_VirtualLan);
612
613                 /*
614                  * Reset ack data. This prevents the ack_timer actually
615                  * doing anything, even if it runs one more time when
616                  * we drop the lock below.
617                  */
618                 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
619                 cnx->num_pending_acks = 0;
620
621                 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
622                                 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
623                                 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
624                                 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
625
626                 /* Clean up any leftover messages */
627                 if (cnx->msgs) {
628                         int i;
629                         for (i = 0; i < VETH_NUMBUFFERS; ++i)
630                                 veth_recycle_msg(cnx, cnx->msgs + i);
631                 }
632
633                 cnx->outstanding_tx = 0;
634                 veth_wake_queues(cnx);
635
636                 /* Drop the lock so we can do stuff that might sleep or
637                  * take other locks. */
638                 spin_unlock_irq(&cnx->lock);
639
640                 del_timer_sync(&cnx->ack_timer);
641                 del_timer_sync(&cnx->reset_timer);
642
643                 spin_lock_irq(&cnx->lock);
644
645                 if (cnx->state & VETH_STATE_RESET)
646                         goto restart;
647
648                 /* Hack, wait for the other end to reset itself. */
649                 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
650                         schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
651                         goto out;
652                 }
653         }
654
655         if (cnx->state & VETH_STATE_SHUTDOWN)
656                 /* It's all over, do nothing */
657                 goto out;
658
659         if ( !(cnx->state & VETH_STATE_OPEN) ) {
660                 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
661                         goto cant_cope;
662
663                 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
664                 cnx->src_inst =
665                         HvCallEvent_getSourceLpInstanceId(rlp,
666                                                           HvLpEvent_Type_VirtualLan);
667                 cnx->dst_inst =
668                         HvCallEvent_getTargetLpInstanceId(rlp,
669                                                           HvLpEvent_Type_VirtualLan);
670                 cnx->state |= VETH_STATE_OPEN;
671         }
672
673         if ( (cnx->state & VETH_STATE_OPEN)
674              && !(cnx->state & VETH_STATE_SENTMON) ) {
675                 rc = veth_signalevent(cnx, VethEventTypeMonitor,
676                                       HvLpEvent_AckInd_DoAck,
677                                       HvLpEvent_AckType_DeferredAck,
678                                       0, 0, 0, 0, 0, 0);
679
680                 if (rc == HvLpEvent_Rc_Good) {
681                         cnx->state |= VETH_STATE_SENTMON;
682                 } else {
683                         if ( (rc != HvLpEvent_Rc_PartitionDead)
684                              && (rc != HvLpEvent_Rc_PathClosed) )
685                                 veth_error("Error sending monitor to LPAR %d, "
686                                                 "rc = %d\n", rlp, rc);
687
688                         /* Oh well, hope we get a cap from the other
689                          * end and do better when that kicks us */
690                         goto out;
691                 }
692         }
693
694         if ( (cnx->state & VETH_STATE_OPEN)
695              && !(cnx->state & VETH_STATE_SENTCAPS)) {
696                 u64 *rawcap = (u64 *)&cnx->local_caps;
697
698                 rc = veth_signalevent(cnx, VethEventTypeCap,
699                                       HvLpEvent_AckInd_DoAck,
700                                       HvLpEvent_AckType_ImmediateAck,
701                                       0, rawcap[0], rawcap[1], rawcap[2],
702                                       rawcap[3], rawcap[4]);
703
704                 if (rc == HvLpEvent_Rc_Good) {
705                         cnx->state |= VETH_STATE_SENTCAPS;
706                 } else {
707                         if ( (rc != HvLpEvent_Rc_PartitionDead)
708                              && (rc != HvLpEvent_Rc_PathClosed) )
709                                 veth_error("Error sending caps to LPAR %d, "
710                                                 "rc = %d\n", rlp, rc);
711
712                         /* Oh well, hope we get a cap from the other
713                          * end and do better when that kicks us */
714                         goto out;
715                 }
716         }
717
718         if ((cnx->state & VETH_STATE_GOTCAPS)
719             && !(cnx->state & VETH_STATE_SENTCAPACK)) {
720                 struct VethCapData *remote_caps = &cnx->remote_caps;
721
722                 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
723                        sizeof(*remote_caps));
724
725                 spin_unlock_irq(&cnx->lock);
726                 rc = veth_process_caps(cnx);
727                 spin_lock_irq(&cnx->lock);
728
729                 /* We dropped the lock, so recheck for anything which
730                  * might mess us up */
731                 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
732                         goto restart;
733
734                 cnx->cap_event.base_event.xRc = rc;
735                 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
736                 if (rc == HvLpEvent_Rc_Good)
737                         cnx->state |= VETH_STATE_SENTCAPACK;
738                 else
739                         goto cant_cope;
740         }
741
742         if ((cnx->state & VETH_STATE_GOTCAPACK)
743             && (cnx->state & VETH_STATE_GOTCAPS)
744             && !(cnx->state & VETH_STATE_READY)) {
745                 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
746                         /* Start the ACK timer */
747                         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
748                         add_timer(&cnx->ack_timer);
749                         cnx->state |= VETH_STATE_READY;
750                 } else {
751                         veth_error("Caps rejected by LPAR %d, rc = %d\n",
752                                         rlp, cnx->cap_ack_event.base_event.xRc);
753                         goto cant_cope;
754                 }
755         }
756
757  out:
758         spin_unlock_irq(&cnx->lock);
759         return;
760
761  cant_cope:
762         /* FIXME: we get here if something happens we really can't
763          * cope with.  The link will never work once we get here, and
764          * all we can do is not lock the rest of the system up */
765         veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
766                         " (state = 0x%04lx)\n", rlp, cnx->state);
767         cnx->state |= VETH_STATE_SHUTDOWN;
768         spin_unlock_irq(&cnx->lock);
769 }
770
771 static int veth_init_connection(u8 rlp)
772 {
773         struct veth_lpar_connection *cnx;
774         struct veth_msg *msgs;
775         int i, rc;
776
777         if ( (rlp == this_lp)
778              || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
779                 return 0;
780
781         cnx = kmalloc(sizeof(*cnx), GFP_KERNEL);
782         if (! cnx)
783                 return -ENOMEM;
784         memset(cnx, 0, sizeof(*cnx));
785
786         cnx->remote_lp = rlp;
787         spin_lock_init(&cnx->lock);
788         INIT_WORK(&cnx->statemachine_wq, veth_statemachine, cnx);
789
790         init_timer(&cnx->ack_timer);
791         cnx->ack_timer.function = veth_timed_ack;
792         cnx->ack_timer.data = (unsigned long) cnx;
793
794         init_timer(&cnx->reset_timer);
795         cnx->reset_timer.function = veth_timed_reset;
796         cnx->reset_timer.data = (unsigned long) cnx;
797         cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
798
799         memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
800
801         veth_cnx[rlp] = cnx;
802
803         /* This gets us 1 reference, which is held on behalf of the driver
804          * infrastructure. It's released at module unload. */
805         kobject_init(&cnx->kobject);
806         cnx->kobject.ktype = &veth_lpar_connection_ktype;
807         rc = kobject_set_name(&cnx->kobject, "cnx%.2d", rlp);
808         if (rc != 0)
809                 return rc;
810
811         msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL);
812         if (! msgs) {
813                 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
814                 return -ENOMEM;
815         }
816
817         cnx->msgs = msgs;
818         memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg));
819
820         for (i = 0; i < VETH_NUMBUFFERS; i++) {
821                 msgs[i].token = i;
822                 veth_stack_push(cnx, msgs + i);
823         }
824
825         cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
826
827         if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
828                 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
829                 return -ENOMEM;
830         }
831
832         cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
833         cnx->local_caps.ack_threshold = ACK_THRESHOLD;
834         cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
835
836         return 0;
837 }
838
839 static void veth_stop_connection(struct veth_lpar_connection *cnx)
840 {
841         if (!cnx)
842                 return;
843
844         spin_lock_irq(&cnx->lock);
845         cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
846         veth_kick_statemachine(cnx);
847         spin_unlock_irq(&cnx->lock);
848
849         /* There's a slim chance the reset code has just queued the
850          * statemachine to run in five seconds. If so we need to cancel
851          * that and requeue the work to run now. */
852         if (cancel_delayed_work(&cnx->statemachine_wq)) {
853                 spin_lock_irq(&cnx->lock);
854                 veth_kick_statemachine(cnx);
855                 spin_unlock_irq(&cnx->lock);
856         }
857
858         /* Wait for the state machine to run. */
859         flush_scheduled_work();
860 }
861
862 static void veth_destroy_connection(struct veth_lpar_connection *cnx)
863 {
864         if (!cnx)
865                 return;
866
867         if (cnx->num_events > 0)
868                 mf_deallocate_lp_events(cnx->remote_lp,
869                                       HvLpEvent_Type_VirtualLan,
870                                       cnx->num_events,
871                                       NULL, NULL);
872         if (cnx->num_ack_events > 0)
873                 mf_deallocate_lp_events(cnx->remote_lp,
874                                       HvLpEvent_Type_VirtualLan,
875                                       cnx->num_ack_events,
876                                       NULL, NULL);
877
878         kfree(cnx->msgs);
879         veth_cnx[cnx->remote_lp] = NULL;
880         kfree(cnx);
881 }
882
883 static void veth_release_connection(struct kobject *kobj)
884 {
885         struct veth_lpar_connection *cnx;
886         cnx = container_of(kobj, struct veth_lpar_connection, kobject);
887         veth_stop_connection(cnx);
888         veth_destroy_connection(cnx);
889 }
890
891 /*
892  * net_device code
893  */
894
895 static int veth_open(struct net_device *dev)
896 {
897         struct veth_port *port = (struct veth_port *) dev->priv;
898
899         memset(&port->stats, 0, sizeof (port->stats));
900         netif_start_queue(dev);
901         return 0;
902 }
903
904 static int veth_close(struct net_device *dev)
905 {
906         netif_stop_queue(dev);
907         return 0;
908 }
909
910 static struct net_device_stats *veth_get_stats(struct net_device *dev)
911 {
912         struct veth_port *port = (struct veth_port *) dev->priv;
913
914         return &port->stats;
915 }
916
917 static int veth_change_mtu(struct net_device *dev, int new_mtu)
918 {
919         if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
920                 return -EINVAL;
921         dev->mtu = new_mtu;
922         return 0;
923 }
924
925 static void veth_set_multicast_list(struct net_device *dev)
926 {
927         struct veth_port *port = (struct veth_port *) dev->priv;
928         unsigned long flags;
929
930         write_lock_irqsave(&port->mcast_gate, flags);
931
932         if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
933                         (dev->mc_count > VETH_MAX_MCAST)) {
934                 port->promiscuous = 1;
935         } else {
936                 struct dev_mc_list *dmi = dev->mc_list;
937                 int i;
938
939                 port->promiscuous = 0;
940
941                 /* Update table */
942                 port->num_mcast = 0;
943
944                 for (i = 0; i < dev->mc_count; i++) {
945                         u8 *addr = dmi->dmi_addr;
946                         u64 xaddr = 0;
947
948                         if (addr[0] & 0x01) {/* multicast address? */
949                                 memcpy(&xaddr, addr, ETH_ALEN);
950                                 port->mcast_addr[port->num_mcast] = xaddr;
951                                 port->num_mcast++;
952                         }
953                         dmi = dmi->next;
954                 }
955         }
956
957         write_unlock_irqrestore(&port->mcast_gate, flags);
958 }
959
960 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
961 {
962         strncpy(info->driver, "veth", sizeof(info->driver) - 1);
963         info->driver[sizeof(info->driver) - 1] = '\0';
964         strncpy(info->version, "1.0", sizeof(info->version) - 1);
965 }
966
967 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
968 {
969         ecmd->supported = (SUPPORTED_1000baseT_Full
970                           | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
971         ecmd->advertising = (SUPPORTED_1000baseT_Full
972                             | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
973         ecmd->port = PORT_FIBRE;
974         ecmd->transceiver = XCVR_INTERNAL;
975         ecmd->phy_address = 0;
976         ecmd->speed = SPEED_1000;
977         ecmd->duplex = DUPLEX_FULL;
978         ecmd->autoneg = AUTONEG_ENABLE;
979         ecmd->maxtxpkt = 120;
980         ecmd->maxrxpkt = 120;
981         return 0;
982 }
983
984 static u32 veth_get_link(struct net_device *dev)
985 {
986         return 1;
987 }
988
989 static struct ethtool_ops ops = {
990         .get_drvinfo = veth_get_drvinfo,
991         .get_settings = veth_get_settings,
992         .get_link = veth_get_link,
993 };
994
995 static struct net_device * __init veth_probe_one(int vlan, struct device *vdev)
996 {
997         struct net_device *dev;
998         struct veth_port *port;
999         int i, rc;
1000
1001         dev = alloc_etherdev(sizeof (struct veth_port));
1002         if (! dev) {
1003                 veth_error("Unable to allocate net_device structure!\n");
1004                 return NULL;
1005         }
1006
1007         port = (struct veth_port *) dev->priv;
1008
1009         spin_lock_init(&port->queue_lock);
1010         rwlock_init(&port->mcast_gate);
1011         port->stopped_map = 0;
1012
1013         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1014                 HvLpVirtualLanIndexMap map;
1015
1016                 if (i == this_lp)
1017                         continue;
1018                 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
1019                 if (map & (0x8000 >> vlan))
1020                         port->lpar_map |= (1 << i);
1021         }
1022         port->dev = vdev;
1023
1024         dev->dev_addr[0] = 0x02;
1025         dev->dev_addr[1] = 0x01;
1026         dev->dev_addr[2] = 0xff;
1027         dev->dev_addr[3] = vlan;
1028         dev->dev_addr[4] = 0xff;
1029         dev->dev_addr[5] = this_lp;
1030
1031         dev->mtu = VETH_MAX_MTU;
1032
1033         memcpy(&port->mac_addr, dev->dev_addr, 6);
1034
1035         dev->open = veth_open;
1036         dev->hard_start_xmit = veth_start_xmit;
1037         dev->stop = veth_close;
1038         dev->get_stats = veth_get_stats;
1039         dev->change_mtu = veth_change_mtu;
1040         dev->set_mac_address = NULL;
1041         dev->set_multicast_list = veth_set_multicast_list;
1042         SET_ETHTOOL_OPS(dev, &ops);
1043
1044         SET_NETDEV_DEV(dev, vdev);
1045
1046         rc = register_netdev(dev);
1047         if (rc != 0) {
1048                 veth_error("Failed registering net device for vlan%d.\n", vlan);
1049                 free_netdev(dev);
1050                 return NULL;
1051         }
1052
1053         kobject_init(&port->kobject);
1054         port->kobject.parent = &dev->class_dev.kobj;
1055         port->kobject.ktype  = &veth_port_ktype;
1056         kobject_set_name(&port->kobject, "veth_port");
1057         if (0 != kobject_add(&port->kobject))
1058                 veth_error("Failed adding port for %s to sysfs.\n", dev->name);
1059
1060         veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
1061                         dev->name, vlan, port->lpar_map);
1062
1063         return dev;
1064 }
1065
1066 /*
1067  * Tx path
1068  */
1069
1070 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
1071                                 struct net_device *dev)
1072 {
1073         struct veth_lpar_connection *cnx = veth_cnx[rlp];
1074         struct veth_port *port = (struct veth_port *) dev->priv;
1075         HvLpEvent_Rc rc;
1076         struct veth_msg *msg = NULL;
1077         unsigned long flags;
1078
1079         if (! cnx)
1080                 return 0;
1081
1082         spin_lock_irqsave(&cnx->lock, flags);
1083
1084         if (! (cnx->state & VETH_STATE_READY))
1085                 goto no_error;
1086
1087         if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
1088                 goto drop;
1089
1090         msg = veth_stack_pop(cnx);
1091         if (! msg)
1092                 goto drop;
1093
1094         msg->in_use = 1;
1095         msg->skb = skb_get(skb);
1096
1097         msg->data.addr[0] = dma_map_single(port->dev, skb->data,
1098                                 skb->len, DMA_TO_DEVICE);
1099
1100         if (dma_mapping_error(msg->data.addr[0]))
1101                 goto recycle_and_drop;
1102
1103         msg->dev = port->dev;
1104         msg->data.len[0] = skb->len;
1105         msg->data.eofmask = 1 << VETH_EOF_SHIFT;
1106
1107         rc = veth_signaldata(cnx, VethEventTypeFrames, msg->token, &msg->data);
1108
1109         if (rc != HvLpEvent_Rc_Good)
1110                 goto recycle_and_drop;
1111
1112         /* If the timer's not already running, start it now. */
1113         if (0 == cnx->outstanding_tx)
1114                 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
1115
1116         cnx->last_contact = jiffies;
1117         cnx->outstanding_tx++;
1118
1119         if (veth_stack_is_empty(cnx))
1120                 veth_stop_queues(cnx);
1121
1122  no_error:
1123         spin_unlock_irqrestore(&cnx->lock, flags);
1124         return 0;
1125
1126  recycle_and_drop:
1127         veth_recycle_msg(cnx, msg);
1128  drop:
1129         spin_unlock_irqrestore(&cnx->lock, flags);
1130         return 1;
1131 }
1132
1133 static void veth_transmit_to_many(struct sk_buff *skb,
1134                                           HvLpIndexMap lpmask,
1135                                           struct net_device *dev)
1136 {
1137         struct veth_port *port = (struct veth_port *) dev->priv;
1138         int i, success, error;
1139
1140         success = error = 0;
1141
1142         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1143                 if ((lpmask & (1 << i)) == 0)
1144                         continue;
1145
1146                 if (veth_transmit_to_one(skb, i, dev))
1147                         error = 1;
1148                 else
1149                         success = 1;
1150         }
1151
1152         if (error)
1153                 port->stats.tx_errors++;
1154
1155         if (success) {
1156                 port->stats.tx_packets++;
1157                 port->stats.tx_bytes += skb->len;
1158         }
1159 }
1160
1161 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1162 {
1163         unsigned char *frame = skb->data;
1164         struct veth_port *port = (struct veth_port *) dev->priv;
1165         HvLpIndexMap lpmask;
1166
1167         if (! (frame[0] & 0x01)) {
1168                 /* unicast packet */
1169                 HvLpIndex rlp = frame[5];
1170
1171                 if ( ! ((1 << rlp) & port->lpar_map) ) {
1172                         dev_kfree_skb(skb);
1173                         return 0;
1174                 }
1175
1176                 lpmask = 1 << rlp;
1177         } else {
1178                 lpmask = port->lpar_map;
1179         }
1180
1181         veth_transmit_to_many(skb, lpmask, dev);
1182
1183         dev_kfree_skb(skb);
1184
1185         return 0;
1186 }
1187
1188 /* You must hold the connection's lock when you call this function. */
1189 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1190                              struct veth_msg *msg)
1191 {
1192         u32 dma_address, dma_length;
1193
1194         if (msg->in_use) {
1195                 msg->in_use = 0;
1196                 dma_address = msg->data.addr[0];
1197                 dma_length = msg->data.len[0];
1198
1199                 if (!dma_mapping_error(dma_address))
1200                         dma_unmap_single(msg->dev, dma_address, dma_length,
1201                                         DMA_TO_DEVICE);
1202
1203                 if (msg->skb) {
1204                         dev_kfree_skb_any(msg->skb);
1205                         msg->skb = NULL;
1206                 }
1207
1208                 memset(&msg->data, 0, sizeof(msg->data));
1209                 veth_stack_push(cnx, msg);
1210         } else if (cnx->state & VETH_STATE_OPEN) {
1211                 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1212                                 cnx->remote_lp, msg->token);
1213         }
1214 }
1215
1216 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1217 {
1218         int i;
1219
1220         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1221                 struct net_device *dev = veth_dev[i];
1222                 struct veth_port *port;
1223                 unsigned long flags;
1224
1225                 if (! dev)
1226                         continue;
1227
1228                 port = (struct veth_port *)dev->priv;
1229
1230                 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1231                         continue;
1232
1233                 spin_lock_irqsave(&port->queue_lock, flags);
1234
1235                 port->stopped_map &= ~(1 << cnx->remote_lp);
1236
1237                 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1238                         veth_debug("cnx %d: woke queue for %s.\n",
1239                                         cnx->remote_lp, dev->name);
1240                         netif_wake_queue(dev);
1241                 }
1242                 spin_unlock_irqrestore(&port->queue_lock, flags);
1243         }
1244 }
1245
1246 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1247 {
1248         int i;
1249
1250         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1251                 struct net_device *dev = veth_dev[i];
1252                 struct veth_port *port;
1253
1254                 if (! dev)
1255                         continue;
1256
1257                 port = (struct veth_port *)dev->priv;
1258
1259                 /* If this cnx is not on the vlan for this port, continue */
1260                 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1261                         continue;
1262
1263                 spin_lock(&port->queue_lock);
1264
1265                 netif_stop_queue(dev);
1266                 port->stopped_map |= (1 << cnx->remote_lp);
1267
1268                 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1269                                 cnx->remote_lp, dev->name, port->stopped_map);
1270
1271                 spin_unlock(&port->queue_lock);
1272         }
1273 }
1274
1275 static void veth_timed_reset(unsigned long ptr)
1276 {
1277         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1278         unsigned long trigger_time, flags;
1279
1280         /* FIXME is it possible this fires after veth_stop_connection()?
1281          * That would reschedule the statemachine for 5 seconds and probably
1282          * execute it after the module's been unloaded. Hmm. */
1283
1284         spin_lock_irqsave(&cnx->lock, flags);
1285
1286         if (cnx->outstanding_tx > 0) {
1287                 trigger_time = cnx->last_contact + cnx->reset_timeout;
1288
1289                 if (trigger_time < jiffies) {
1290                         cnx->state |= VETH_STATE_RESET;
1291                         veth_kick_statemachine(cnx);
1292                         veth_error("%d packets not acked by LPAR %d within %d "
1293                                         "seconds, resetting.\n",
1294                                         cnx->outstanding_tx, cnx->remote_lp,
1295                                         cnx->reset_timeout / HZ);
1296                 } else {
1297                         /* Reschedule the timer */
1298                         trigger_time = jiffies + cnx->reset_timeout;
1299                         mod_timer(&cnx->reset_timer, trigger_time);
1300                 }
1301         }
1302
1303         spin_unlock_irqrestore(&cnx->lock, flags);
1304 }
1305
1306 /*
1307  * Rx path
1308  */
1309
1310 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1311 {
1312         int wanted = 0;
1313         int i;
1314         unsigned long flags;
1315
1316         if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1317                 return 1;
1318
1319         read_lock_irqsave(&port->mcast_gate, flags);
1320
1321         if (port->promiscuous) {
1322                 wanted = 1;
1323                 goto out;
1324         }
1325
1326         for (i = 0; i < port->num_mcast; ++i) {
1327                 if (port->mcast_addr[i] == mac_addr) {
1328                         wanted = 1;
1329                         break;
1330                 }
1331         }
1332
1333  out:
1334         read_unlock_irqrestore(&port->mcast_gate, flags);
1335
1336         return wanted;
1337 }
1338
1339 struct dma_chunk {
1340         u64 addr;
1341         u64 size;
1342 };
1343
1344 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1345
1346 static inline void veth_build_dma_list(struct dma_chunk *list,
1347                                        unsigned char *p, unsigned long length)
1348 {
1349         unsigned long done;
1350         int i = 1;
1351
1352         /* FIXME: skbs are continguous in real addresses.  Do we
1353          * really need to break it into PAGE_SIZE chunks, or can we do
1354          * it just at the granularity of iSeries real->absolute
1355          * mapping?  Indeed, given the way the allocator works, can we
1356          * count on them being absolutely contiguous? */
1357         list[0].addr = ISERIES_HV_ADDR(p);
1358         list[0].size = min(length,
1359                            PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1360
1361         done = list[0].size;
1362         while (done < length) {
1363                 list[i].addr = ISERIES_HV_ADDR(p + done);
1364                 list[i].size = min(length-done, PAGE_SIZE);
1365                 done += list[i].size;
1366                 i++;
1367         }
1368 }
1369
1370 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1371 {
1372         HvLpEvent_Rc rc;
1373
1374         rc = veth_signaldata(cnx, VethEventTypeFramesAck,
1375                              0, &cnx->pending_acks);
1376
1377         if (rc != HvLpEvent_Rc_Good)
1378                 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1379                                 cnx->remote_lp, (int)rc);
1380
1381         cnx->num_pending_acks = 0;
1382         memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1383 }
1384
1385 static void veth_receive(struct veth_lpar_connection *cnx,
1386                          struct VethLpEvent *event)
1387 {
1388         struct VethFramesData *senddata = &event->u.frames_data;
1389         int startchunk = 0;
1390         int nchunks;
1391         unsigned long flags;
1392         HvLpDma_Rc rc;
1393
1394         do {
1395                 u16 length = 0;
1396                 struct sk_buff *skb;
1397                 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1398                 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1399                 u64 dest;
1400                 HvLpVirtualLanIndex vlan;
1401                 struct net_device *dev;
1402                 struct veth_port *port;
1403
1404                 /* FIXME: do we need this? */
1405                 memset(local_list, 0, sizeof(local_list));
1406                 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1407
1408                 /* a 0 address marks the end of the valid entries */
1409                 if (senddata->addr[startchunk] == 0)
1410                         break;
1411
1412                 /* make sure that we have at least 1 EOF entry in the
1413                  * remaining entries */
1414                 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1415                         veth_error("Missing EOF fragment in event "
1416                                         "eofmask = 0x%x startchunk = %d\n",
1417                                         (unsigned)senddata->eofmask,
1418                                         startchunk);
1419                         break;
1420                 }
1421
1422                 /* build list of chunks in this frame */
1423                 nchunks = 0;
1424                 do {
1425                         remote_list[nchunks].addr =
1426                                 (u64) senddata->addr[startchunk+nchunks] << 32;
1427                         remote_list[nchunks].size =
1428                                 senddata->len[startchunk+nchunks];
1429                         length += remote_list[nchunks].size;
1430                 } while (! (senddata->eofmask &
1431                             (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1432
1433                 /* length == total length of all chunks */
1434                 /* nchunks == # of chunks in this frame */
1435
1436                 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1437                         veth_error("Received oversize frame from LPAR %d "
1438                                         "(length = %d)\n",
1439                                         cnx->remote_lp, length);
1440                         continue;
1441                 }
1442
1443                 skb = alloc_skb(length, GFP_ATOMIC);
1444                 if (!skb)
1445                         continue;
1446
1447                 veth_build_dma_list(local_list, skb->data, length);
1448
1449                 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1450                                             event->base_event.xSourceLp,
1451                                             HvLpDma_Direction_RemoteToLocal,
1452                                             cnx->src_inst,
1453                                             cnx->dst_inst,
1454                                             HvLpDma_AddressType_RealAddress,
1455                                             HvLpDma_AddressType_TceIndex,
1456                                             ISERIES_HV_ADDR(&local_list),
1457                                             ISERIES_HV_ADDR(&remote_list),
1458                                             length);
1459                 if (rc != HvLpDma_Rc_Good) {
1460                         dev_kfree_skb_irq(skb);
1461                         continue;
1462                 }
1463
1464                 vlan = skb->data[9];
1465                 dev = veth_dev[vlan];
1466                 if (! dev) {
1467                         /*
1468                          * Some earlier versions of the driver sent
1469                          * broadcasts down all connections, even to lpars
1470                          * that weren't on the relevant vlan. So ignore
1471                          * packets belonging to a vlan we're not on.
1472                          * We can also be here if we receive packets while
1473                          * the driver is going down, because then dev is NULL.
1474                          */
1475                         dev_kfree_skb_irq(skb);
1476                         continue;
1477                 }
1478
1479                 port = (struct veth_port *)dev->priv;
1480                 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1481
1482                 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1483                         dev_kfree_skb_irq(skb);
1484                         continue;
1485                 }
1486                 if (! veth_frame_wanted(port, dest)) {
1487                         dev_kfree_skb_irq(skb);
1488                         continue;
1489                 }
1490
1491                 skb_put(skb, length);
1492                 skb->dev = dev;
1493                 skb->protocol = eth_type_trans(skb, dev);
1494                 skb->ip_summed = CHECKSUM_NONE;
1495                 netif_rx(skb);  /* send it up */
1496                 port->stats.rx_packets++;
1497                 port->stats.rx_bytes += length;
1498         } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1499
1500         /* Ack it */
1501         spin_lock_irqsave(&cnx->lock, flags);
1502         BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1503
1504         cnx->pending_acks[cnx->num_pending_acks++] =
1505                 event->base_event.xCorrelationToken;
1506
1507         if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1508              || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1509                 veth_flush_acks(cnx);
1510
1511         spin_unlock_irqrestore(&cnx->lock, flags);
1512 }
1513
1514 static void veth_timed_ack(unsigned long ptr)
1515 {
1516         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1517         unsigned long flags;
1518
1519         /* Ack all the events */
1520         spin_lock_irqsave(&cnx->lock, flags);
1521         if (cnx->num_pending_acks > 0)
1522                 veth_flush_acks(cnx);
1523
1524         /* Reschedule the timer */
1525         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1526         add_timer(&cnx->ack_timer);
1527         spin_unlock_irqrestore(&cnx->lock, flags);
1528 }
1529
1530 static int veth_remove(struct vio_dev *vdev)
1531 {
1532         struct veth_lpar_connection *cnx;
1533         struct net_device *dev;
1534         struct veth_port *port;
1535         int i;
1536
1537         dev = veth_dev[vdev->unit_address];
1538
1539         if (! dev)
1540                 return 0;
1541
1542         port = netdev_priv(dev);
1543
1544         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1545                 cnx = veth_cnx[i];
1546
1547                 if (cnx && (port->lpar_map & (1 << i))) {
1548                         /* Drop our reference to connections on our VLAN */
1549                         kobject_put(&cnx->kobject);
1550                 }
1551         }
1552
1553         veth_dev[vdev->unit_address] = NULL;
1554         kobject_del(&port->kobject);
1555         kobject_put(&port->kobject);
1556         unregister_netdev(dev);
1557         free_netdev(dev);
1558
1559         return 0;
1560 }
1561
1562 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1563 {
1564         int i = vdev->unit_address;
1565         struct net_device *dev;
1566         struct veth_port *port;
1567
1568         dev = veth_probe_one(i, &vdev->dev);
1569         if (dev == NULL) {
1570                 veth_remove(vdev);
1571                 return 1;
1572         }
1573         veth_dev[i] = dev;
1574
1575         port = (struct veth_port*)netdev_priv(dev);
1576
1577         /* Start the state machine on each connection on this vlan. If we're
1578          * the first dev to do so this will commence link negotiation */
1579         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1580                 struct veth_lpar_connection *cnx;
1581
1582                 if (! (port->lpar_map & (1 << i)))
1583                         continue;
1584
1585                 cnx = veth_cnx[i];
1586                 if (!cnx)
1587                         continue;
1588
1589                 kobject_get(&cnx->kobject);
1590                 veth_kick_statemachine(cnx);
1591         }
1592
1593         return 0;
1594 }
1595
1596 /**
1597  * veth_device_table: Used by vio.c to match devices that we
1598  * support.
1599  */
1600 static struct vio_device_id veth_device_table[] __devinitdata = {
1601         { "vlan", "" },
1602         { "", "" }
1603 };
1604 MODULE_DEVICE_TABLE(vio, veth_device_table);
1605
1606 static struct vio_driver veth_driver = {
1607         .name = "iseries_veth",
1608         .id_table = veth_device_table,
1609         .probe = veth_probe,
1610         .remove = veth_remove
1611 };
1612
1613 /*
1614  * Module initialization/cleanup
1615  */
1616
1617 void __exit veth_module_cleanup(void)
1618 {
1619         int i;
1620         struct veth_lpar_connection *cnx;
1621
1622         /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1623         HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1624
1625         /* Make sure any work queued from Hypervisor callbacks is finished. */
1626         flush_scheduled_work();
1627
1628         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1629                 cnx = veth_cnx[i];
1630
1631                 if (!cnx)
1632                         continue;
1633
1634                 /* Remove the connection from sysfs */
1635                 kobject_del(&cnx->kobject);
1636                 /* Drop the driver's reference to the connection */
1637                 kobject_put(&cnx->kobject);
1638         }
1639
1640         /* Unregister the driver, which will close all the netdevs and stop
1641          * the connections when they're no longer referenced. */
1642         vio_unregister_driver(&veth_driver);
1643 }
1644 module_exit(veth_module_cleanup);
1645
1646 int __init veth_module_init(void)
1647 {
1648         int i;
1649         int rc;
1650
1651         this_lp = HvLpConfig_getLpIndex_outline();
1652
1653         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1654                 rc = veth_init_connection(i);
1655                 if (rc != 0)
1656                         goto error;
1657         }
1658
1659         HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1660                                   &veth_handle_event);
1661
1662         rc = vio_register_driver(&veth_driver);
1663         if (rc != 0)
1664                 goto error;
1665
1666         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1667                 struct kobject *kobj;
1668
1669                 if (!veth_cnx[i])
1670                         continue;
1671
1672                 kobj = &veth_cnx[i]->kobject;
1673                 kobj->parent = &veth_driver.driver.kobj;
1674                 /* If the add failes, complain but otherwise continue */
1675                 if (0 != kobject_add(kobj))
1676                         veth_error("cnx %d: Failed adding to sysfs.\n", i);
1677         }
1678
1679         return 0;
1680
1681 error:
1682         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1683                 veth_destroy_connection(veth_cnx[i]);
1684         }
1685
1686         return rc;
1687 }
1688 module_init(veth_module_init);