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