[PATCH] iseries_veth: Be consistent about driver name, increment version
[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 MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
85 MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
86 MODULE_LICENSE("GPL");
87
88 #define VETH_EVENT_CAP  (0)
89 #define VETH_EVENT_FRAMES       (1)
90 #define VETH_EVENT_MONITOR      (2)
91 #define VETH_EVENT_FRAMES_ACK   (3)
92
93 #define VETH_MAX_ACKS_PER_MSG   (20)
94 #define VETH_MAX_FRAMES_PER_MSG (6)
95
96 struct veth_frames_data {
97         u32 addr[VETH_MAX_FRAMES_PER_MSG];
98         u16 len[VETH_MAX_FRAMES_PER_MSG];
99         u32 eofmask;
100 };
101 #define VETH_EOF_SHIFT          (32-VETH_MAX_FRAMES_PER_MSG)
102
103 struct veth_frames_ack_data {
104         u16 token[VETH_MAX_ACKS_PER_MSG];
105 };
106
107 struct veth_cap_data {
108         u8 caps_version;
109         u8 rsvd1;
110         u16 num_buffers;
111         u16 ack_threshold;
112         u16 rsvd2;
113         u32 ack_timeout;
114         u32 rsvd3;
115         u64 rsvd4[3];
116 };
117
118 struct veth_lpevent {
119         struct HvLpEvent base_event;
120         union {
121                 struct veth_cap_data caps_data;
122                 struct veth_frames_data frames_data;
123                 struct veth_frames_ack_data frames_ack_data;
124         } u;
125
126 };
127
128 #define DRV_NAME        "iseries_veth"
129 #define DRV_VERSION     "2.0"
130
131 #define VETH_NUMBUFFERS         (120)
132 #define VETH_ACKTIMEOUT         (1000000) /* microseconds */
133 #define VETH_MAX_MCAST          (12)
134
135 #define VETH_MAX_MTU            (9000)
136
137 #if VETH_NUMBUFFERS < 10
138 #define ACK_THRESHOLD           (1)
139 #elif VETH_NUMBUFFERS < 20
140 #define ACK_THRESHOLD           (4)
141 #elif VETH_NUMBUFFERS < 40
142 #define ACK_THRESHOLD           (10)
143 #else
144 #define ACK_THRESHOLD           (20)
145 #endif
146
147 #define VETH_STATE_SHUTDOWN     (0x0001)
148 #define VETH_STATE_OPEN         (0x0002)
149 #define VETH_STATE_RESET        (0x0004)
150 #define VETH_STATE_SENTMON      (0x0008)
151 #define VETH_STATE_SENTCAPS     (0x0010)
152 #define VETH_STATE_GOTCAPACK    (0x0020)
153 #define VETH_STATE_GOTCAPS      (0x0040)
154 #define VETH_STATE_SENTCAPACK   (0x0080)
155 #define VETH_STATE_READY        (0x0100)
156
157 struct veth_msg {
158         struct veth_msg *next;
159         struct veth_frames_data data;
160         int token;
161         int in_use;
162         struct sk_buff *skb;
163         struct device *dev;
164 };
165
166 struct veth_lpar_connection {
167         HvLpIndex remote_lp;
168         struct work_struct statemachine_wq;
169         struct veth_msg *msgs;
170         int num_events;
171         struct veth_cap_data local_caps;
172
173         struct kobject kobject;
174         struct timer_list ack_timer;
175
176         struct timer_list reset_timer;
177         unsigned int reset_timeout;
178         unsigned long last_contact;
179         int outstanding_tx;
180
181         spinlock_t lock;
182         unsigned long state;
183         HvLpInstanceId src_inst;
184         HvLpInstanceId dst_inst;
185         struct veth_lpevent cap_event, cap_ack_event;
186         u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
187         u32 num_pending_acks;
188
189         int num_ack_events;
190         struct veth_cap_data remote_caps;
191         u32 ack_timeout;
192
193         struct veth_msg *msg_stack_head;
194 };
195
196 struct veth_port {
197         struct device *dev;
198         struct net_device_stats stats;
199         u64 mac_addr;
200         HvLpIndexMap lpar_map;
201
202         /* queue_lock protects the stopped_map and dev's queue. */
203         spinlock_t queue_lock;
204         HvLpIndexMap stopped_map;
205
206         /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
207         rwlock_t mcast_gate;
208         int promiscuous;
209         int num_mcast;
210         u64 mcast_addr[VETH_MAX_MCAST];
211
212         struct kobject kobject;
213 };
214
215 static HvLpIndex this_lp;
216 static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
217 static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
218
219 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
220 static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
221 static void veth_wake_queues(struct veth_lpar_connection *cnx);
222 static void veth_stop_queues(struct veth_lpar_connection *cnx);
223 static void veth_receive(struct veth_lpar_connection *, struct veth_lpevent *);
224 static void veth_release_connection(struct kobject *kobject);
225 static void veth_timed_ack(unsigned long ptr);
226 static void veth_timed_reset(unsigned long ptr);
227
228 /*
229  * Utility functions
230  */
231
232 #define veth_info(fmt, args...) \
233         printk(KERN_INFO DRV_NAME ": " fmt, ## args)
234
235 #define veth_error(fmt, args...) \
236         printk(KERN_ERR DRV_NAME ": Error: " fmt, ## args)
237
238 #ifdef DEBUG
239 #define veth_debug(fmt, args...) \
240         printk(KERN_DEBUG DRV_NAME ": " fmt, ## args)
241 #else
242 #define veth_debug(fmt, args...) do {} while (0)
243 #endif
244
245 /* You must hold the connection's lock when you call this function. */
246 static inline void veth_stack_push(struct veth_lpar_connection *cnx,
247                                    struct veth_msg *msg)
248 {
249         msg->next = cnx->msg_stack_head;
250         cnx->msg_stack_head = msg;
251 }
252
253 /* You must hold the connection's lock when you call this function. */
254 static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
255 {
256         struct veth_msg *msg;
257
258         msg = cnx->msg_stack_head;
259         if (msg)
260                 cnx->msg_stack_head = cnx->msg_stack_head->next;
261
262         return msg;
263 }
264
265 /* You must hold the connection's lock when you call this function. */
266 static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
267 {
268         return cnx->msg_stack_head == NULL;
269 }
270
271 static inline HvLpEvent_Rc
272 veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
273                  HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
274                  u64 token,
275                  u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
276 {
277         return HvCallEvent_signalLpEventFast(cnx->remote_lp,
278                                              HvLpEvent_Type_VirtualLan,
279                                              subtype, ackind, acktype,
280                                              cnx->src_inst,
281                                              cnx->dst_inst,
282                                              token, data1, data2, data3,
283                                              data4, data5);
284 }
285
286 static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
287                                            u16 subtype, u64 token, void *data)
288 {
289         u64 *p = (u64 *) data;
290
291         return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
292                                 HvLpEvent_AckType_ImmediateAck,
293                                 token, p[0], p[1], p[2], p[3], p[4]);
294 }
295
296 struct veth_allocation {
297         struct completion c;
298         int num;
299 };
300
301 static void veth_complete_allocation(void *parm, int number)
302 {
303         struct veth_allocation *vc = (struct veth_allocation *)parm;
304
305         vc->num = number;
306         complete(&vc->c);
307 }
308
309 static int veth_allocate_events(HvLpIndex rlp, int number)
310 {
311         struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
312
313         mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
314                             sizeof(struct veth_lpevent), number,
315                             &veth_complete_allocation, &vc);
316         wait_for_completion(&vc.c);
317
318         return vc.num;
319 }
320
321 /*
322  * sysfs support
323  */
324
325 struct veth_cnx_attribute {
326         struct attribute attr;
327         ssize_t (*show)(struct veth_lpar_connection *, char *buf);
328         ssize_t (*store)(struct veth_lpar_connection *, const char *buf);
329 };
330
331 static ssize_t veth_cnx_attribute_show(struct kobject *kobj,
332                 struct attribute *attr, char *buf)
333 {
334         struct veth_cnx_attribute *cnx_attr;
335         struct veth_lpar_connection *cnx;
336
337         cnx_attr = container_of(attr, struct veth_cnx_attribute, attr);
338         cnx = container_of(kobj, struct veth_lpar_connection, kobject);
339
340         if (!cnx_attr->show)
341                 return -EIO;
342
343         return cnx_attr->show(cnx, buf);
344 }
345
346 #define CUSTOM_CNX_ATTR(_name, _format, _expression)                    \
347 static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\
348 {                                                                       \
349         return sprintf(buf, _format, _expression);                      \
350 }                                                                       \
351 struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name)
352
353 #define SIMPLE_CNX_ATTR(_name)  \
354         CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name)
355
356 SIMPLE_CNX_ATTR(outstanding_tx);
357 SIMPLE_CNX_ATTR(remote_lp);
358 SIMPLE_CNX_ATTR(num_events);
359 SIMPLE_CNX_ATTR(src_inst);
360 SIMPLE_CNX_ATTR(dst_inst);
361 SIMPLE_CNX_ATTR(num_pending_acks);
362 SIMPLE_CNX_ATTR(num_ack_events);
363 CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout));
364 CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout));
365 CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state);
366 CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ?
367                 jiffies_to_msecs(jiffies - cnx->last_contact) : 0);
368
369 #define GET_CNX_ATTR(_name)     (&veth_cnx_attr_##_name.attr)
370
371 static struct attribute *veth_cnx_default_attrs[] = {
372         GET_CNX_ATTR(outstanding_tx),
373         GET_CNX_ATTR(remote_lp),
374         GET_CNX_ATTR(num_events),
375         GET_CNX_ATTR(reset_timeout),
376         GET_CNX_ATTR(last_contact),
377         GET_CNX_ATTR(state),
378         GET_CNX_ATTR(src_inst),
379         GET_CNX_ATTR(dst_inst),
380         GET_CNX_ATTR(num_pending_acks),
381         GET_CNX_ATTR(num_ack_events),
382         GET_CNX_ATTR(ack_timeout),
383         NULL
384 };
385
386 static struct sysfs_ops veth_cnx_sysfs_ops = {
387                 .show = veth_cnx_attribute_show
388 };
389
390 static struct kobj_type veth_lpar_connection_ktype = {
391         .release        = veth_release_connection,
392         .sysfs_ops      = &veth_cnx_sysfs_ops,
393         .default_attrs  = veth_cnx_default_attrs
394 };
395
396 struct veth_port_attribute {
397         struct attribute attr;
398         ssize_t (*show)(struct veth_port *, char *buf);
399         ssize_t (*store)(struct veth_port *, const char *buf);
400 };
401
402 static ssize_t veth_port_attribute_show(struct kobject *kobj,
403                 struct attribute *attr, char *buf)
404 {
405         struct veth_port_attribute *port_attr;
406         struct veth_port *port;
407
408         port_attr = container_of(attr, struct veth_port_attribute, attr);
409         port = container_of(kobj, struct veth_port, kobject);
410
411         if (!port_attr->show)
412                 return -EIO;
413
414         return port_attr->show(port, buf);
415 }
416
417 #define CUSTOM_PORT_ATTR(_name, _format, _expression)                   \
418 static ssize_t _name##_show(struct veth_port *port, char *buf)          \
419 {                                                                       \
420         return sprintf(buf, _format, _expression);                      \
421 }                                                                       \
422 struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name)
423
424 #define SIMPLE_PORT_ATTR(_name) \
425         CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name)
426
427 SIMPLE_PORT_ATTR(promiscuous);
428 SIMPLE_PORT_ATTR(num_mcast);
429 CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map);
430 CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map);
431 CUSTOM_PORT_ATTR(mac_addr, "0x%lX\n", port->mac_addr);
432
433 #define GET_PORT_ATTR(_name)    (&veth_port_attr_##_name.attr)
434 static struct attribute *veth_port_default_attrs[] = {
435         GET_PORT_ATTR(mac_addr),
436         GET_PORT_ATTR(lpar_map),
437         GET_PORT_ATTR(stopped_map),
438         GET_PORT_ATTR(promiscuous),
439         GET_PORT_ATTR(num_mcast),
440         NULL
441 };
442
443 static struct sysfs_ops veth_port_sysfs_ops = {
444         .show = veth_port_attribute_show
445 };
446
447 static struct kobj_type veth_port_ktype = {
448         .sysfs_ops      = &veth_port_sysfs_ops,
449         .default_attrs  = veth_port_default_attrs
450 };
451
452 /*
453  * LPAR connection code
454  */
455
456 static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
457 {
458         schedule_work(&cnx->statemachine_wq);
459 }
460
461 static void veth_take_cap(struct veth_lpar_connection *cnx,
462                           struct veth_lpevent *event)
463 {
464         unsigned long flags;
465
466         spin_lock_irqsave(&cnx->lock, flags);
467         /* Receiving caps may mean the other end has just come up, so
468          * we need to reload the instance ID of the far end */
469         cnx->dst_inst =
470                 HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
471                                                   HvLpEvent_Type_VirtualLan);
472
473         if (cnx->state & VETH_STATE_GOTCAPS) {
474                 veth_error("Received a second capabilities from LPAR %d.\n",
475                            cnx->remote_lp);
476                 event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
477                 HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
478         } else {
479                 memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
480                 cnx->state |= VETH_STATE_GOTCAPS;
481                 veth_kick_statemachine(cnx);
482         }
483         spin_unlock_irqrestore(&cnx->lock, flags);
484 }
485
486 static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
487                               struct veth_lpevent *event)
488 {
489         unsigned long flags;
490
491         spin_lock_irqsave(&cnx->lock, flags);
492         if (cnx->state & VETH_STATE_GOTCAPACK) {
493                 veth_error("Received a second capabilities ack from LPAR %d.\n",
494                            cnx->remote_lp);
495         } else {
496                 memcpy(&cnx->cap_ack_event, event,
497                        sizeof(&cnx->cap_ack_event));
498                 cnx->state |= VETH_STATE_GOTCAPACK;
499                 veth_kick_statemachine(cnx);
500         }
501         spin_unlock_irqrestore(&cnx->lock, flags);
502 }
503
504 static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
505                                   struct veth_lpevent *event)
506 {
507         unsigned long flags;
508
509         spin_lock_irqsave(&cnx->lock, flags);
510         veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
511
512         /* Avoid kicking the statemachine once we're shutdown.
513          * It's unnecessary and it could break veth_stop_connection(). */
514
515         if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
516                 cnx->state |= VETH_STATE_RESET;
517                 veth_kick_statemachine(cnx);
518         }
519         spin_unlock_irqrestore(&cnx->lock, flags);
520 }
521
522 static void veth_handle_ack(struct veth_lpevent *event)
523 {
524         HvLpIndex rlp = event->base_event.xTargetLp;
525         struct veth_lpar_connection *cnx = veth_cnx[rlp];
526
527         BUG_ON(! cnx);
528
529         switch (event->base_event.xSubtype) {
530         case VETH_EVENT_CAP:
531                 veth_take_cap_ack(cnx, event);
532                 break;
533         case VETH_EVENT_MONITOR:
534                 veth_take_monitor_ack(cnx, event);
535                 break;
536         default:
537                 veth_error("Unknown ack type %d from LPAR %d.\n",
538                                 event->base_event.xSubtype, rlp);
539         };
540 }
541
542 static void veth_handle_int(struct veth_lpevent *event)
543 {
544         HvLpIndex rlp = event->base_event.xSourceLp;
545         struct veth_lpar_connection *cnx = veth_cnx[rlp];
546         unsigned long flags;
547         int i, acked = 0;
548
549         BUG_ON(! cnx);
550
551         switch (event->base_event.xSubtype) {
552         case VETH_EVENT_CAP:
553                 veth_take_cap(cnx, event);
554                 break;
555         case VETH_EVENT_MONITOR:
556                 /* do nothing... this'll hang out here til we're dead,
557                  * and the hypervisor will return it for us. */
558                 break;
559         case VETH_EVENT_FRAMES_ACK:
560                 spin_lock_irqsave(&cnx->lock, flags);
561
562                 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
563                         u16 msgnum = event->u.frames_ack_data.token[i];
564
565                         if (msgnum < VETH_NUMBUFFERS) {
566                                 veth_recycle_msg(cnx, cnx->msgs + msgnum);
567                                 cnx->outstanding_tx--;
568                                 acked++;
569                         }
570                 }
571
572                 if (acked > 0) {
573                         cnx->last_contact = jiffies;
574                         veth_wake_queues(cnx);
575                 }
576
577                 spin_unlock_irqrestore(&cnx->lock, flags);
578                 break;
579         case VETH_EVENT_FRAMES:
580                 veth_receive(cnx, event);
581                 break;
582         default:
583                 veth_error("Unknown interrupt type %d from LPAR %d.\n",
584                                 event->base_event.xSubtype, rlp);
585         };
586 }
587
588 static void veth_handle_event(struct HvLpEvent *event, struct pt_regs *regs)
589 {
590         struct veth_lpevent *veth_event = (struct veth_lpevent *)event;
591
592         if (event->xFlags.xFunction == HvLpEvent_Function_Ack)
593                 veth_handle_ack(veth_event);
594         else if (event->xFlags.xFunction == HvLpEvent_Function_Int)
595                 veth_handle_int(veth_event);
596 }
597
598 static int veth_process_caps(struct veth_lpar_connection *cnx)
599 {
600         struct veth_cap_data *remote_caps = &cnx->remote_caps;
601         int num_acks_needed;
602
603         /* Convert timer to jiffies */
604         cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
605
606         if ( (remote_caps->num_buffers == 0)
607              || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
608              || (remote_caps->ack_threshold == 0)
609              || (cnx->ack_timeout == 0) ) {
610                 veth_error("Received incompatible capabilities from LPAR %d.\n",
611                                 cnx->remote_lp);
612                 return HvLpEvent_Rc_InvalidSubtypeData;
613         }
614
615         num_acks_needed = (remote_caps->num_buffers
616                            / remote_caps->ack_threshold) + 1;
617
618         /* FIXME: locking on num_ack_events? */
619         if (cnx->num_ack_events < num_acks_needed) {
620                 int num;
621
622                 num = veth_allocate_events(cnx->remote_lp,
623                                            num_acks_needed-cnx->num_ack_events);
624                 if (num > 0)
625                         cnx->num_ack_events += num;
626
627                 if (cnx->num_ack_events < num_acks_needed) {
628                         veth_error("Couldn't allocate enough ack events "
629                                         "for LPAR %d.\n", cnx->remote_lp);
630
631                         return HvLpEvent_Rc_BufferNotAvailable;
632                 }
633         }
634
635
636         return HvLpEvent_Rc_Good;
637 }
638
639 /* FIXME: The gotos here are a bit dubious */
640 static void veth_statemachine(void *p)
641 {
642         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)p;
643         int rlp = cnx->remote_lp;
644         int rc;
645
646         spin_lock_irq(&cnx->lock);
647
648  restart:
649         if (cnx->state & VETH_STATE_RESET) {
650                 if (cnx->state & VETH_STATE_OPEN)
651                         HvCallEvent_closeLpEventPath(cnx->remote_lp,
652                                                      HvLpEvent_Type_VirtualLan);
653
654                 /*
655                  * Reset ack data. This prevents the ack_timer actually
656                  * doing anything, even if it runs one more time when
657                  * we drop the lock below.
658                  */
659                 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
660                 cnx->num_pending_acks = 0;
661
662                 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
663                                 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
664                                 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
665                                 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
666
667                 /* Clean up any leftover messages */
668                 if (cnx->msgs) {
669                         int i;
670                         for (i = 0; i < VETH_NUMBUFFERS; ++i)
671                                 veth_recycle_msg(cnx, cnx->msgs + i);
672                 }
673
674                 cnx->outstanding_tx = 0;
675                 veth_wake_queues(cnx);
676
677                 /* Drop the lock so we can do stuff that might sleep or
678                  * take other locks. */
679                 spin_unlock_irq(&cnx->lock);
680
681                 del_timer_sync(&cnx->ack_timer);
682                 del_timer_sync(&cnx->reset_timer);
683
684                 spin_lock_irq(&cnx->lock);
685
686                 if (cnx->state & VETH_STATE_RESET)
687                         goto restart;
688
689                 /* Hack, wait for the other end to reset itself. */
690                 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
691                         schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
692                         goto out;
693                 }
694         }
695
696         if (cnx->state & VETH_STATE_SHUTDOWN)
697                 /* It's all over, do nothing */
698                 goto out;
699
700         if ( !(cnx->state & VETH_STATE_OPEN) ) {
701                 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
702                         goto cant_cope;
703
704                 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
705                 cnx->src_inst =
706                         HvCallEvent_getSourceLpInstanceId(rlp,
707                                                           HvLpEvent_Type_VirtualLan);
708                 cnx->dst_inst =
709                         HvCallEvent_getTargetLpInstanceId(rlp,
710                                                           HvLpEvent_Type_VirtualLan);
711                 cnx->state |= VETH_STATE_OPEN;
712         }
713
714         if ( (cnx->state & VETH_STATE_OPEN)
715              && !(cnx->state & VETH_STATE_SENTMON) ) {
716                 rc = veth_signalevent(cnx, VETH_EVENT_MONITOR,
717                                       HvLpEvent_AckInd_DoAck,
718                                       HvLpEvent_AckType_DeferredAck,
719                                       0, 0, 0, 0, 0, 0);
720
721                 if (rc == HvLpEvent_Rc_Good) {
722                         cnx->state |= VETH_STATE_SENTMON;
723                 } else {
724                         if ( (rc != HvLpEvent_Rc_PartitionDead)
725                              && (rc != HvLpEvent_Rc_PathClosed) )
726                                 veth_error("Error sending monitor to LPAR %d, "
727                                                 "rc = %d\n", rlp, rc);
728
729                         /* Oh well, hope we get a cap from the other
730                          * end and do better when that kicks us */
731                         goto out;
732                 }
733         }
734
735         if ( (cnx->state & VETH_STATE_OPEN)
736              && !(cnx->state & VETH_STATE_SENTCAPS)) {
737                 u64 *rawcap = (u64 *)&cnx->local_caps;
738
739                 rc = veth_signalevent(cnx, VETH_EVENT_CAP,
740                                       HvLpEvent_AckInd_DoAck,
741                                       HvLpEvent_AckType_ImmediateAck,
742                                       0, rawcap[0], rawcap[1], rawcap[2],
743                                       rawcap[3], rawcap[4]);
744
745                 if (rc == HvLpEvent_Rc_Good) {
746                         cnx->state |= VETH_STATE_SENTCAPS;
747                 } else {
748                         if ( (rc != HvLpEvent_Rc_PartitionDead)
749                              && (rc != HvLpEvent_Rc_PathClosed) )
750                                 veth_error("Error sending caps to LPAR %d, "
751                                                 "rc = %d\n", rlp, rc);
752
753                         /* Oh well, hope we get a cap from the other
754                          * end and do better when that kicks us */
755                         goto out;
756                 }
757         }
758
759         if ((cnx->state & VETH_STATE_GOTCAPS)
760             && !(cnx->state & VETH_STATE_SENTCAPACK)) {
761                 struct veth_cap_data *remote_caps = &cnx->remote_caps;
762
763                 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
764                        sizeof(*remote_caps));
765
766                 spin_unlock_irq(&cnx->lock);
767                 rc = veth_process_caps(cnx);
768                 spin_lock_irq(&cnx->lock);
769
770                 /* We dropped the lock, so recheck for anything which
771                  * might mess us up */
772                 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
773                         goto restart;
774
775                 cnx->cap_event.base_event.xRc = rc;
776                 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
777                 if (rc == HvLpEvent_Rc_Good)
778                         cnx->state |= VETH_STATE_SENTCAPACK;
779                 else
780                         goto cant_cope;
781         }
782
783         if ((cnx->state & VETH_STATE_GOTCAPACK)
784             && (cnx->state & VETH_STATE_GOTCAPS)
785             && !(cnx->state & VETH_STATE_READY)) {
786                 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
787                         /* Start the ACK timer */
788                         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
789                         add_timer(&cnx->ack_timer);
790                         cnx->state |= VETH_STATE_READY;
791                 } else {
792                         veth_error("Caps rejected by LPAR %d, rc = %d\n",
793                                         rlp, cnx->cap_ack_event.base_event.xRc);
794                         goto cant_cope;
795                 }
796         }
797
798  out:
799         spin_unlock_irq(&cnx->lock);
800         return;
801
802  cant_cope:
803         /* FIXME: we get here if something happens we really can't
804          * cope with.  The link will never work once we get here, and
805          * all we can do is not lock the rest of the system up */
806         veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
807                         " (state = 0x%04lx)\n", rlp, cnx->state);
808         cnx->state |= VETH_STATE_SHUTDOWN;
809         spin_unlock_irq(&cnx->lock);
810 }
811
812 static int veth_init_connection(u8 rlp)
813 {
814         struct veth_lpar_connection *cnx;
815         struct veth_msg *msgs;
816         int i, rc;
817
818         if ( (rlp == this_lp)
819              || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
820                 return 0;
821
822         cnx = kmalloc(sizeof(*cnx), GFP_KERNEL);
823         if (! cnx)
824                 return -ENOMEM;
825         memset(cnx, 0, sizeof(*cnx));
826
827         cnx->remote_lp = rlp;
828         spin_lock_init(&cnx->lock);
829         INIT_WORK(&cnx->statemachine_wq, veth_statemachine, cnx);
830
831         init_timer(&cnx->ack_timer);
832         cnx->ack_timer.function = veth_timed_ack;
833         cnx->ack_timer.data = (unsigned long) cnx;
834
835         init_timer(&cnx->reset_timer);
836         cnx->reset_timer.function = veth_timed_reset;
837         cnx->reset_timer.data = (unsigned long) cnx;
838         cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
839
840         memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
841
842         veth_cnx[rlp] = cnx;
843
844         /* This gets us 1 reference, which is held on behalf of the driver
845          * infrastructure. It's released at module unload. */
846         kobject_init(&cnx->kobject);
847         cnx->kobject.ktype = &veth_lpar_connection_ktype;
848         rc = kobject_set_name(&cnx->kobject, "cnx%.2d", rlp);
849         if (rc != 0)
850                 return rc;
851
852         msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL);
853         if (! msgs) {
854                 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
855                 return -ENOMEM;
856         }
857
858         cnx->msgs = msgs;
859         memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg));
860
861         for (i = 0; i < VETH_NUMBUFFERS; i++) {
862                 msgs[i].token = i;
863                 veth_stack_push(cnx, msgs + i);
864         }
865
866         cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
867
868         if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
869                 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
870                 return -ENOMEM;
871         }
872
873         cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
874         cnx->local_caps.ack_threshold = ACK_THRESHOLD;
875         cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
876
877         return 0;
878 }
879
880 static void veth_stop_connection(struct veth_lpar_connection *cnx)
881 {
882         if (!cnx)
883                 return;
884
885         spin_lock_irq(&cnx->lock);
886         cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
887         veth_kick_statemachine(cnx);
888         spin_unlock_irq(&cnx->lock);
889
890         /* There's a slim chance the reset code has just queued the
891          * statemachine to run in five seconds. If so we need to cancel
892          * that and requeue the work to run now. */
893         if (cancel_delayed_work(&cnx->statemachine_wq)) {
894                 spin_lock_irq(&cnx->lock);
895                 veth_kick_statemachine(cnx);
896                 spin_unlock_irq(&cnx->lock);
897         }
898
899         /* Wait for the state machine to run. */
900         flush_scheduled_work();
901 }
902
903 static void veth_destroy_connection(struct veth_lpar_connection *cnx)
904 {
905         if (!cnx)
906                 return;
907
908         if (cnx->num_events > 0)
909                 mf_deallocate_lp_events(cnx->remote_lp,
910                                       HvLpEvent_Type_VirtualLan,
911                                       cnx->num_events,
912                                       NULL, NULL);
913         if (cnx->num_ack_events > 0)
914                 mf_deallocate_lp_events(cnx->remote_lp,
915                                       HvLpEvent_Type_VirtualLan,
916                                       cnx->num_ack_events,
917                                       NULL, NULL);
918
919         kfree(cnx->msgs);
920         veth_cnx[cnx->remote_lp] = NULL;
921         kfree(cnx);
922 }
923
924 static void veth_release_connection(struct kobject *kobj)
925 {
926         struct veth_lpar_connection *cnx;
927         cnx = container_of(kobj, struct veth_lpar_connection, kobject);
928         veth_stop_connection(cnx);
929         veth_destroy_connection(cnx);
930 }
931
932 /*
933  * net_device code
934  */
935
936 static int veth_open(struct net_device *dev)
937 {
938         struct veth_port *port = (struct veth_port *) dev->priv;
939
940         memset(&port->stats, 0, sizeof (port->stats));
941         netif_start_queue(dev);
942         return 0;
943 }
944
945 static int veth_close(struct net_device *dev)
946 {
947         netif_stop_queue(dev);
948         return 0;
949 }
950
951 static struct net_device_stats *veth_get_stats(struct net_device *dev)
952 {
953         struct veth_port *port = (struct veth_port *) dev->priv;
954
955         return &port->stats;
956 }
957
958 static int veth_change_mtu(struct net_device *dev, int new_mtu)
959 {
960         if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
961                 return -EINVAL;
962         dev->mtu = new_mtu;
963         return 0;
964 }
965
966 static void veth_set_multicast_list(struct net_device *dev)
967 {
968         struct veth_port *port = (struct veth_port *) dev->priv;
969         unsigned long flags;
970
971         write_lock_irqsave(&port->mcast_gate, flags);
972
973         if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
974                         (dev->mc_count > VETH_MAX_MCAST)) {
975                 port->promiscuous = 1;
976         } else {
977                 struct dev_mc_list *dmi = dev->mc_list;
978                 int i;
979
980                 port->promiscuous = 0;
981
982                 /* Update table */
983                 port->num_mcast = 0;
984
985                 for (i = 0; i < dev->mc_count; i++) {
986                         u8 *addr = dmi->dmi_addr;
987                         u64 xaddr = 0;
988
989                         if (addr[0] & 0x01) {/* multicast address? */
990                                 memcpy(&xaddr, addr, ETH_ALEN);
991                                 port->mcast_addr[port->num_mcast] = xaddr;
992                                 port->num_mcast++;
993                         }
994                         dmi = dmi->next;
995                 }
996         }
997
998         write_unlock_irqrestore(&port->mcast_gate, flags);
999 }
1000
1001 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1002 {
1003         strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
1004         info->driver[sizeof(info->driver) - 1] = '\0';
1005         strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
1006         info->version[sizeof(info->version) - 1] = '\0';
1007 }
1008
1009 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
1010 {
1011         ecmd->supported = (SUPPORTED_1000baseT_Full
1012                           | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1013         ecmd->advertising = (SUPPORTED_1000baseT_Full
1014                             | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1015         ecmd->port = PORT_FIBRE;
1016         ecmd->transceiver = XCVR_INTERNAL;
1017         ecmd->phy_address = 0;
1018         ecmd->speed = SPEED_1000;
1019         ecmd->duplex = DUPLEX_FULL;
1020         ecmd->autoneg = AUTONEG_ENABLE;
1021         ecmd->maxtxpkt = 120;
1022         ecmd->maxrxpkt = 120;
1023         return 0;
1024 }
1025
1026 static u32 veth_get_link(struct net_device *dev)
1027 {
1028         return 1;
1029 }
1030
1031 static struct ethtool_ops ops = {
1032         .get_drvinfo = veth_get_drvinfo,
1033         .get_settings = veth_get_settings,
1034         .get_link = veth_get_link,
1035 };
1036
1037 static struct net_device * __init veth_probe_one(int vlan, struct device *vdev)
1038 {
1039         struct net_device *dev;
1040         struct veth_port *port;
1041         int i, rc;
1042
1043         dev = alloc_etherdev(sizeof (struct veth_port));
1044         if (! dev) {
1045                 veth_error("Unable to allocate net_device structure!\n");
1046                 return NULL;
1047         }
1048
1049         port = (struct veth_port *) dev->priv;
1050
1051         spin_lock_init(&port->queue_lock);
1052         rwlock_init(&port->mcast_gate);
1053         port->stopped_map = 0;
1054
1055         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1056                 HvLpVirtualLanIndexMap map;
1057
1058                 if (i == this_lp)
1059                         continue;
1060                 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
1061                 if (map & (0x8000 >> vlan))
1062                         port->lpar_map |= (1 << i);
1063         }
1064         port->dev = vdev;
1065
1066         dev->dev_addr[0] = 0x02;
1067         dev->dev_addr[1] = 0x01;
1068         dev->dev_addr[2] = 0xff;
1069         dev->dev_addr[3] = vlan;
1070         dev->dev_addr[4] = 0xff;
1071         dev->dev_addr[5] = this_lp;
1072
1073         dev->mtu = VETH_MAX_MTU;
1074
1075         memcpy(&port->mac_addr, dev->dev_addr, 6);
1076
1077         dev->open = veth_open;
1078         dev->hard_start_xmit = veth_start_xmit;
1079         dev->stop = veth_close;
1080         dev->get_stats = veth_get_stats;
1081         dev->change_mtu = veth_change_mtu;
1082         dev->set_mac_address = NULL;
1083         dev->set_multicast_list = veth_set_multicast_list;
1084         SET_ETHTOOL_OPS(dev, &ops);
1085
1086         SET_NETDEV_DEV(dev, vdev);
1087
1088         rc = register_netdev(dev);
1089         if (rc != 0) {
1090                 veth_error("Failed registering net device for vlan%d.\n", vlan);
1091                 free_netdev(dev);
1092                 return NULL;
1093         }
1094
1095         kobject_init(&port->kobject);
1096         port->kobject.parent = &dev->class_dev.kobj;
1097         port->kobject.ktype  = &veth_port_ktype;
1098         kobject_set_name(&port->kobject, "veth_port");
1099         if (0 != kobject_add(&port->kobject))
1100                 veth_error("Failed adding port for %s to sysfs.\n", dev->name);
1101
1102         veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
1103                         dev->name, vlan, port->lpar_map);
1104
1105         return dev;
1106 }
1107
1108 /*
1109  * Tx path
1110  */
1111
1112 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
1113                                 struct net_device *dev)
1114 {
1115         struct veth_lpar_connection *cnx = veth_cnx[rlp];
1116         struct veth_port *port = (struct veth_port *) dev->priv;
1117         HvLpEvent_Rc rc;
1118         struct veth_msg *msg = NULL;
1119         unsigned long flags;
1120
1121         if (! cnx)
1122                 return 0;
1123
1124         spin_lock_irqsave(&cnx->lock, flags);
1125
1126         if (! (cnx->state & VETH_STATE_READY))
1127                 goto no_error;
1128
1129         if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
1130                 goto drop;
1131
1132         msg = veth_stack_pop(cnx);
1133         if (! msg)
1134                 goto drop;
1135
1136         msg->in_use = 1;
1137         msg->skb = skb_get(skb);
1138
1139         msg->data.addr[0] = dma_map_single(port->dev, skb->data,
1140                                 skb->len, DMA_TO_DEVICE);
1141
1142         if (dma_mapping_error(msg->data.addr[0]))
1143                 goto recycle_and_drop;
1144
1145         msg->dev = port->dev;
1146         msg->data.len[0] = skb->len;
1147         msg->data.eofmask = 1 << VETH_EOF_SHIFT;
1148
1149         rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
1150
1151         if (rc != HvLpEvent_Rc_Good)
1152                 goto recycle_and_drop;
1153
1154         /* If the timer's not already running, start it now. */
1155         if (0 == cnx->outstanding_tx)
1156                 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
1157
1158         cnx->last_contact = jiffies;
1159         cnx->outstanding_tx++;
1160
1161         if (veth_stack_is_empty(cnx))
1162                 veth_stop_queues(cnx);
1163
1164  no_error:
1165         spin_unlock_irqrestore(&cnx->lock, flags);
1166         return 0;
1167
1168  recycle_and_drop:
1169         veth_recycle_msg(cnx, msg);
1170  drop:
1171         spin_unlock_irqrestore(&cnx->lock, flags);
1172         return 1;
1173 }
1174
1175 static void veth_transmit_to_many(struct sk_buff *skb,
1176                                           HvLpIndexMap lpmask,
1177                                           struct net_device *dev)
1178 {
1179         struct veth_port *port = (struct veth_port *) dev->priv;
1180         int i, success, error;
1181
1182         success = error = 0;
1183
1184         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1185                 if ((lpmask & (1 << i)) == 0)
1186                         continue;
1187
1188                 if (veth_transmit_to_one(skb, i, dev))
1189                         error = 1;
1190                 else
1191                         success = 1;
1192         }
1193
1194         if (error)
1195                 port->stats.tx_errors++;
1196
1197         if (success) {
1198                 port->stats.tx_packets++;
1199                 port->stats.tx_bytes += skb->len;
1200         }
1201 }
1202
1203 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1204 {
1205         unsigned char *frame = skb->data;
1206         struct veth_port *port = (struct veth_port *) dev->priv;
1207         HvLpIndexMap lpmask;
1208
1209         if (! (frame[0] & 0x01)) {
1210                 /* unicast packet */
1211                 HvLpIndex rlp = frame[5];
1212
1213                 if ( ! ((1 << rlp) & port->lpar_map) ) {
1214                         dev_kfree_skb(skb);
1215                         return 0;
1216                 }
1217
1218                 lpmask = 1 << rlp;
1219         } else {
1220                 lpmask = port->lpar_map;
1221         }
1222
1223         veth_transmit_to_many(skb, lpmask, dev);
1224
1225         dev_kfree_skb(skb);
1226
1227         return 0;
1228 }
1229
1230 /* You must hold the connection's lock when you call this function. */
1231 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1232                              struct veth_msg *msg)
1233 {
1234         u32 dma_address, dma_length;
1235
1236         if (msg->in_use) {
1237                 msg->in_use = 0;
1238                 dma_address = msg->data.addr[0];
1239                 dma_length = msg->data.len[0];
1240
1241                 if (!dma_mapping_error(dma_address))
1242                         dma_unmap_single(msg->dev, dma_address, dma_length,
1243                                         DMA_TO_DEVICE);
1244
1245                 if (msg->skb) {
1246                         dev_kfree_skb_any(msg->skb);
1247                         msg->skb = NULL;
1248                 }
1249
1250                 memset(&msg->data, 0, sizeof(msg->data));
1251                 veth_stack_push(cnx, msg);
1252         } else if (cnx->state & VETH_STATE_OPEN) {
1253                 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1254                                 cnx->remote_lp, msg->token);
1255         }
1256 }
1257
1258 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1259 {
1260         int i;
1261
1262         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1263                 struct net_device *dev = veth_dev[i];
1264                 struct veth_port *port;
1265                 unsigned long flags;
1266
1267                 if (! dev)
1268                         continue;
1269
1270                 port = (struct veth_port *)dev->priv;
1271
1272                 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1273                         continue;
1274
1275                 spin_lock_irqsave(&port->queue_lock, flags);
1276
1277                 port->stopped_map &= ~(1 << cnx->remote_lp);
1278
1279                 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1280                         veth_debug("cnx %d: woke queue for %s.\n",
1281                                         cnx->remote_lp, dev->name);
1282                         netif_wake_queue(dev);
1283                 }
1284                 spin_unlock_irqrestore(&port->queue_lock, flags);
1285         }
1286 }
1287
1288 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1289 {
1290         int i;
1291
1292         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1293                 struct net_device *dev = veth_dev[i];
1294                 struct veth_port *port;
1295
1296                 if (! dev)
1297                         continue;
1298
1299                 port = (struct veth_port *)dev->priv;
1300
1301                 /* If this cnx is not on the vlan for this port, continue */
1302                 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1303                         continue;
1304
1305                 spin_lock(&port->queue_lock);
1306
1307                 netif_stop_queue(dev);
1308                 port->stopped_map |= (1 << cnx->remote_lp);
1309
1310                 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1311                                 cnx->remote_lp, dev->name, port->stopped_map);
1312
1313                 spin_unlock(&port->queue_lock);
1314         }
1315 }
1316
1317 static void veth_timed_reset(unsigned long ptr)
1318 {
1319         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1320         unsigned long trigger_time, flags;
1321
1322         /* FIXME is it possible this fires after veth_stop_connection()?
1323          * That would reschedule the statemachine for 5 seconds and probably
1324          * execute it after the module's been unloaded. Hmm. */
1325
1326         spin_lock_irqsave(&cnx->lock, flags);
1327
1328         if (cnx->outstanding_tx > 0) {
1329                 trigger_time = cnx->last_contact + cnx->reset_timeout;
1330
1331                 if (trigger_time < jiffies) {
1332                         cnx->state |= VETH_STATE_RESET;
1333                         veth_kick_statemachine(cnx);
1334                         veth_error("%d packets not acked by LPAR %d within %d "
1335                                         "seconds, resetting.\n",
1336                                         cnx->outstanding_tx, cnx->remote_lp,
1337                                         cnx->reset_timeout / HZ);
1338                 } else {
1339                         /* Reschedule the timer */
1340                         trigger_time = jiffies + cnx->reset_timeout;
1341                         mod_timer(&cnx->reset_timer, trigger_time);
1342                 }
1343         }
1344
1345         spin_unlock_irqrestore(&cnx->lock, flags);
1346 }
1347
1348 /*
1349  * Rx path
1350  */
1351
1352 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1353 {
1354         int wanted = 0;
1355         int i;
1356         unsigned long flags;
1357
1358         if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1359                 return 1;
1360
1361         read_lock_irqsave(&port->mcast_gate, flags);
1362
1363         if (port->promiscuous) {
1364                 wanted = 1;
1365                 goto out;
1366         }
1367
1368         for (i = 0; i < port->num_mcast; ++i) {
1369                 if (port->mcast_addr[i] == mac_addr) {
1370                         wanted = 1;
1371                         break;
1372                 }
1373         }
1374
1375  out:
1376         read_unlock_irqrestore(&port->mcast_gate, flags);
1377
1378         return wanted;
1379 }
1380
1381 struct dma_chunk {
1382         u64 addr;
1383         u64 size;
1384 };
1385
1386 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1387
1388 static inline void veth_build_dma_list(struct dma_chunk *list,
1389                                        unsigned char *p, unsigned long length)
1390 {
1391         unsigned long done;
1392         int i = 1;
1393
1394         /* FIXME: skbs are continguous in real addresses.  Do we
1395          * really need to break it into PAGE_SIZE chunks, or can we do
1396          * it just at the granularity of iSeries real->absolute
1397          * mapping?  Indeed, given the way the allocator works, can we
1398          * count on them being absolutely contiguous? */
1399         list[0].addr = ISERIES_HV_ADDR(p);
1400         list[0].size = min(length,
1401                            PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1402
1403         done = list[0].size;
1404         while (done < length) {
1405                 list[i].addr = ISERIES_HV_ADDR(p + done);
1406                 list[i].size = min(length-done, PAGE_SIZE);
1407                 done += list[i].size;
1408                 i++;
1409         }
1410 }
1411
1412 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1413 {
1414         HvLpEvent_Rc rc;
1415
1416         rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
1417                              0, &cnx->pending_acks);
1418
1419         if (rc != HvLpEvent_Rc_Good)
1420                 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1421                                 cnx->remote_lp, (int)rc);
1422
1423         cnx->num_pending_acks = 0;
1424         memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1425 }
1426
1427 static void veth_receive(struct veth_lpar_connection *cnx,
1428                          struct veth_lpevent *event)
1429 {
1430         struct veth_frames_data *senddata = &event->u.frames_data;
1431         int startchunk = 0;
1432         int nchunks;
1433         unsigned long flags;
1434         HvLpDma_Rc rc;
1435
1436         do {
1437                 u16 length = 0;
1438                 struct sk_buff *skb;
1439                 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1440                 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1441                 u64 dest;
1442                 HvLpVirtualLanIndex vlan;
1443                 struct net_device *dev;
1444                 struct veth_port *port;
1445
1446                 /* FIXME: do we need this? */
1447                 memset(local_list, 0, sizeof(local_list));
1448                 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1449
1450                 /* a 0 address marks the end of the valid entries */
1451                 if (senddata->addr[startchunk] == 0)
1452                         break;
1453
1454                 /* make sure that we have at least 1 EOF entry in the
1455                  * remaining entries */
1456                 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1457                         veth_error("Missing EOF fragment in event "
1458                                         "eofmask = 0x%x startchunk = %d\n",
1459                                         (unsigned)senddata->eofmask,
1460                                         startchunk);
1461                         break;
1462                 }
1463
1464                 /* build list of chunks in this frame */
1465                 nchunks = 0;
1466                 do {
1467                         remote_list[nchunks].addr =
1468                                 (u64) senddata->addr[startchunk+nchunks] << 32;
1469                         remote_list[nchunks].size =
1470                                 senddata->len[startchunk+nchunks];
1471                         length += remote_list[nchunks].size;
1472                 } while (! (senddata->eofmask &
1473                             (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1474
1475                 /* length == total length of all chunks */
1476                 /* nchunks == # of chunks in this frame */
1477
1478                 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1479                         veth_error("Received oversize frame from LPAR %d "
1480                                         "(length = %d)\n",
1481                                         cnx->remote_lp, length);
1482                         continue;
1483                 }
1484
1485                 skb = alloc_skb(length, GFP_ATOMIC);
1486                 if (!skb)
1487                         continue;
1488
1489                 veth_build_dma_list(local_list, skb->data, length);
1490
1491                 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1492                                             event->base_event.xSourceLp,
1493                                             HvLpDma_Direction_RemoteToLocal,
1494                                             cnx->src_inst,
1495                                             cnx->dst_inst,
1496                                             HvLpDma_AddressType_RealAddress,
1497                                             HvLpDma_AddressType_TceIndex,
1498                                             ISERIES_HV_ADDR(&local_list),
1499                                             ISERIES_HV_ADDR(&remote_list),
1500                                             length);
1501                 if (rc != HvLpDma_Rc_Good) {
1502                         dev_kfree_skb_irq(skb);
1503                         continue;
1504                 }
1505
1506                 vlan = skb->data[9];
1507                 dev = veth_dev[vlan];
1508                 if (! dev) {
1509                         /*
1510                          * Some earlier versions of the driver sent
1511                          * broadcasts down all connections, even to lpars
1512                          * that weren't on the relevant vlan. So ignore
1513                          * packets belonging to a vlan we're not on.
1514                          * We can also be here if we receive packets while
1515                          * the driver is going down, because then dev is NULL.
1516                          */
1517                         dev_kfree_skb_irq(skb);
1518                         continue;
1519                 }
1520
1521                 port = (struct veth_port *)dev->priv;
1522                 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1523
1524                 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1525                         dev_kfree_skb_irq(skb);
1526                         continue;
1527                 }
1528                 if (! veth_frame_wanted(port, dest)) {
1529                         dev_kfree_skb_irq(skb);
1530                         continue;
1531                 }
1532
1533                 skb_put(skb, length);
1534                 skb->dev = dev;
1535                 skb->protocol = eth_type_trans(skb, dev);
1536                 skb->ip_summed = CHECKSUM_NONE;
1537                 netif_rx(skb);  /* send it up */
1538                 port->stats.rx_packets++;
1539                 port->stats.rx_bytes += length;
1540         } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1541
1542         /* Ack it */
1543         spin_lock_irqsave(&cnx->lock, flags);
1544         BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1545
1546         cnx->pending_acks[cnx->num_pending_acks++] =
1547                 event->base_event.xCorrelationToken;
1548
1549         if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1550              || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1551                 veth_flush_acks(cnx);
1552
1553         spin_unlock_irqrestore(&cnx->lock, flags);
1554 }
1555
1556 static void veth_timed_ack(unsigned long ptr)
1557 {
1558         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1559         unsigned long flags;
1560
1561         /* Ack all the events */
1562         spin_lock_irqsave(&cnx->lock, flags);
1563         if (cnx->num_pending_acks > 0)
1564                 veth_flush_acks(cnx);
1565
1566         /* Reschedule the timer */
1567         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1568         add_timer(&cnx->ack_timer);
1569         spin_unlock_irqrestore(&cnx->lock, flags);
1570 }
1571
1572 static int veth_remove(struct vio_dev *vdev)
1573 {
1574         struct veth_lpar_connection *cnx;
1575         struct net_device *dev;
1576         struct veth_port *port;
1577         int i;
1578
1579         dev = veth_dev[vdev->unit_address];
1580
1581         if (! dev)
1582                 return 0;
1583
1584         port = netdev_priv(dev);
1585
1586         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1587                 cnx = veth_cnx[i];
1588
1589                 if (cnx && (port->lpar_map & (1 << i))) {
1590                         /* Drop our reference to connections on our VLAN */
1591                         kobject_put(&cnx->kobject);
1592                 }
1593         }
1594
1595         veth_dev[vdev->unit_address] = NULL;
1596         kobject_del(&port->kobject);
1597         kobject_put(&port->kobject);
1598         unregister_netdev(dev);
1599         free_netdev(dev);
1600
1601         return 0;
1602 }
1603
1604 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1605 {
1606         int i = vdev->unit_address;
1607         struct net_device *dev;
1608         struct veth_port *port;
1609
1610         dev = veth_probe_one(i, &vdev->dev);
1611         if (dev == NULL) {
1612                 veth_remove(vdev);
1613                 return 1;
1614         }
1615         veth_dev[i] = dev;
1616
1617         port = (struct veth_port*)netdev_priv(dev);
1618
1619         /* Start the state machine on each connection on this vlan. If we're
1620          * the first dev to do so this will commence link negotiation */
1621         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1622                 struct veth_lpar_connection *cnx;
1623
1624                 if (! (port->lpar_map & (1 << i)))
1625                         continue;
1626
1627                 cnx = veth_cnx[i];
1628                 if (!cnx)
1629                         continue;
1630
1631                 kobject_get(&cnx->kobject);
1632                 veth_kick_statemachine(cnx);
1633         }
1634
1635         return 0;
1636 }
1637
1638 /**
1639  * veth_device_table: Used by vio.c to match devices that we
1640  * support.
1641  */
1642 static struct vio_device_id veth_device_table[] __devinitdata = {
1643         { "vlan", "" },
1644         { "", "" }
1645 };
1646 MODULE_DEVICE_TABLE(vio, veth_device_table);
1647
1648 static struct vio_driver veth_driver = {
1649         .name = DRV_NAME,
1650         .id_table = veth_device_table,
1651         .probe = veth_probe,
1652         .remove = veth_remove
1653 };
1654
1655 /*
1656  * Module initialization/cleanup
1657  */
1658
1659 void __exit veth_module_cleanup(void)
1660 {
1661         int i;
1662         struct veth_lpar_connection *cnx;
1663
1664         /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1665         HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1666
1667         /* Make sure any work queued from Hypervisor callbacks is finished. */
1668         flush_scheduled_work();
1669
1670         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1671                 cnx = veth_cnx[i];
1672
1673                 if (!cnx)
1674                         continue;
1675
1676                 /* Remove the connection from sysfs */
1677                 kobject_del(&cnx->kobject);
1678                 /* Drop the driver's reference to the connection */
1679                 kobject_put(&cnx->kobject);
1680         }
1681
1682         /* Unregister the driver, which will close all the netdevs and stop
1683          * the connections when they're no longer referenced. */
1684         vio_unregister_driver(&veth_driver);
1685 }
1686 module_exit(veth_module_cleanup);
1687
1688 int __init veth_module_init(void)
1689 {
1690         int i;
1691         int rc;
1692
1693         this_lp = HvLpConfig_getLpIndex_outline();
1694
1695         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1696                 rc = veth_init_connection(i);
1697                 if (rc != 0)
1698                         goto error;
1699         }
1700
1701         HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1702                                   &veth_handle_event);
1703
1704         rc = vio_register_driver(&veth_driver);
1705         if (rc != 0)
1706                 goto error;
1707
1708         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1709                 struct kobject *kobj;
1710
1711                 if (!veth_cnx[i])
1712                         continue;
1713
1714                 kobj = &veth_cnx[i]->kobject;
1715                 kobj->parent = &veth_driver.driver.kobj;
1716                 /* If the add failes, complain but otherwise continue */
1717                 if (0 != kobject_add(kobj))
1718                         veth_error("cnx %d: Failed adding to sysfs.\n", i);
1719         }
1720
1721         return 0;
1722
1723 error:
1724         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1725                 veth_destroy_connection(veth_cnx[i]);
1726         }
1727
1728         return rc;
1729 }
1730 module_init(veth_module_init);