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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / drivers / net / iseries_veth.c
blobaa7286bc4364a79bf4fffd9b4b762948621779a6
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%llX\n", port->mac_addr);
433
434 #define GET_PORT_ATTR(_name) (&veth_port_attr_##_name.attr)
435 static struct attribute *veth_port_default_attrs[] = {
436 GET_PORT_ATTR(mac_addr),
437 GET_PORT_ATTR(lpar_map),
438 GET_PORT_ATTR(stopped_map),
439 GET_PORT_ATTR(promiscuous),
440 GET_PORT_ATTR(num_mcast),
441 NULL
442 };
443
444 static 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 const struct net_device_ops veth_netdev_ops = {
1025 .ndo_open = veth_open,
1026 .ndo_stop = veth_close,
1027 .ndo_start_xmit = veth_start_xmit,
1028 .ndo_change_mtu = veth_change_mtu,
1029 .ndo_set_multicast_list = veth_set_multicast_list,
1030 .ndo_set_mac_address = NULL,
1031 .ndo_validate_addr = eth_validate_addr,
1032 };
1033
1034 static struct net_device *veth_probe_one(int vlan,
1035 struct vio_dev *vio_dev)
1036 {
1037 struct net_device *dev;
1038 struct veth_port *port;
1039 struct device *vdev = &vio_dev->dev;
1040 int i, rc;
1041 const unsigned char *mac_addr;
1042
1043 mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
1044 if (mac_addr == NULL)
1045 mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
1046 if (mac_addr == NULL) {
1047 veth_error("Unable to fetch MAC address from device tree.\n");
1048 return NULL;
1049 }
1050
1051 dev = alloc_etherdev(sizeof (struct veth_port));
1052 if (! dev) {
1053 veth_error("Unable to allocate net_device structure!\n");
1054 return NULL;
1055 }
1056
1057 port = netdev_priv(dev);
1058
1059 spin_lock_init(&port->queue_lock);
1060 rwlock_init(&port->mcast_gate);
1061 port->stopped_map = 0;
1062
1063 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1064 HvLpVirtualLanIndexMap map;
1065
1066 if (i == this_lp)
1067 continue;
1068 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
1069 if (map & (0x8000 >> vlan))
1070 port->lpar_map |= (1 << i);
1071 }
1072 port->dev = vdev;
1073
1074 memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
1075
1076 dev->mtu = VETH_MAX_MTU;
1077
1078 memcpy(&port->mac_addr, mac_addr, ETH_ALEN);
1079
1080 dev->netdev_ops = &veth_netdev_ops;
1081 SET_ETHTOOL_OPS(dev, &ops);
1082
1083 SET_NETDEV_DEV(dev, vdev);
1084
1085 rc = register_netdev(dev);
1086 if (rc != 0) {
1087 veth_error("Failed registering net device for vlan%d.\n", vlan);
1088 free_netdev(dev);
1089 return NULL;
1090 }
1091
1092 kobject_init(&port->kobject, &veth_port_ktype);
1093 if (0 != kobject_add(&port->kobject, &dev->dev.kobj, "veth_port"))
1094 veth_error("Failed adding port for %s to sysfs.\n", dev->name);
1095
1096 veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
1097 dev->name, vlan, port->lpar_map);
1098
1099 return dev;
1100 }
1101
1102 /*
1103 * Tx path
1104 */
1105
1106 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
1107 struct net_device *dev)
1108 {
1109 struct veth_lpar_connection *cnx = veth_cnx[rlp];
1110 struct veth_port *port = netdev_priv(dev);
1111 HvLpEvent_Rc rc;
1112 struct veth_msg *msg = NULL;
1113 unsigned long flags;
1114
1115 if (! cnx)
1116 return 0;
1117
1118 spin_lock_irqsave(&cnx->lock, flags);
1119
1120 if (! (cnx->state & VETH_STATE_READY))
1121 goto no_error;
1122
1123 if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
1124 goto drop;
1125
1126 msg = veth_stack_pop(cnx);
1127 if (! msg)
1128 goto drop;
1129
1130 msg->in_use = 1;
1131 msg->skb = skb_get(skb);
1132
1133 msg->data.addr[0] = dma_map_single(port->dev, skb->data,
1134 skb->len, DMA_TO_DEVICE);
1135
1136 if (dma_mapping_error(port->dev, msg->data.addr[0]))
1137 goto recycle_and_drop;
1138
1139 msg->dev = port->dev;
1140 msg->data.len[0] = skb->len;
1141 msg->data.eofmask = 1 << VETH_EOF_SHIFT;
1142
1143 rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
1144
1145 if (rc != HvLpEvent_Rc_Good)
1146 goto recycle_and_drop;
1147
1148 /* If the timer's not already running, start it now. */
1149 if (0 == cnx->outstanding_tx)
1150 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
1151
1152 cnx->last_contact = jiffies;
1153 cnx->outstanding_tx++;
1154
1155 if (veth_stack_is_empty(cnx))
1156 veth_stop_queues(cnx);
1157
1158 no_error:
1159 spin_unlock_irqrestore(&cnx->lock, flags);
1160 return 0;
1161
1162 recycle_and_drop:
1163 veth_recycle_msg(cnx, msg);
1164 drop:
1165 spin_unlock_irqrestore(&cnx->lock, flags);
1166 return 1;
1167 }
1168
1169 static void veth_transmit_to_many(struct sk_buff *skb,
1170 HvLpIndexMap lpmask,
1171 struct net_device *dev)
1172 {
1173 int i, success, error;
1174
1175 success = error = 0;
1176
1177 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1178 if ((lpmask & (1 << i)) == 0)
1179 continue;
1180
1181 if (veth_transmit_to_one(skb, i, dev))
1182 error = 1;
1183 else
1184 success = 1;
1185 }
1186
1187 if (error)
1188 dev->stats.tx_errors++;
1189
1190 if (success) {
1191 dev->stats.tx_packets++;
1192 dev->stats.tx_bytes += skb->len;
1193 }
1194 }
1195
1196 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1197 {
1198 unsigned char *frame = skb->data;
1199 struct veth_port *port = netdev_priv(dev);
1200 HvLpIndexMap lpmask;
1201
1202 if (! (frame[0] & 0x01)) {
1203 /* unicast packet */
1204 HvLpIndex rlp = frame[5];
1205
1206 if ( ! ((1 << rlp) & port->lpar_map) ) {
1207 dev_kfree_skb(skb);
1208 return NETDEV_TX_OK;
1209 }
1210
1211 lpmask = 1 << rlp;
1212 } else {
1213 lpmask = port->lpar_map;
1214 }
1215
1216 veth_transmit_to_many(skb, lpmask, dev);
1217
1218 dev_kfree_skb(skb);
1219
1220 return NETDEV_TX_OK;
1221 }
1222
1223 /* You must hold the connection's lock when you call this function. */
1224 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1225 struct veth_msg *msg)
1226 {
1227 u32 dma_address, dma_length;
1228
1229 if (msg->in_use) {
1230 msg->in_use = 0;
1231 dma_address = msg->data.addr[0];
1232 dma_length = msg->data.len[0];
1233
1234 if (!dma_mapping_error(msg->dev, dma_address))
1235 dma_unmap_single(msg->dev, dma_address, dma_length,
1236 DMA_TO_DEVICE);
1237
1238 if (msg->skb) {
1239 dev_kfree_skb_any(msg->skb);
1240 msg->skb = NULL;
1241 }
1242
1243 memset(&msg->data, 0, sizeof(msg->data));
1244 veth_stack_push(cnx, msg);
1245 } else if (cnx->state & VETH_STATE_OPEN) {
1246 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1247 cnx->remote_lp, msg->token);
1248 }
1249 }
1250
1251 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1252 {
1253 int i;
1254
1255 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1256 struct net_device *dev = veth_dev[i];
1257 struct veth_port *port;
1258 unsigned long flags;
1259
1260 if (! dev)
1261 continue;
1262
1263 port = netdev_priv(dev);
1264
1265 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1266 continue;
1267
1268 spin_lock_irqsave(&port->queue_lock, flags);
1269
1270 port->stopped_map &= ~(1 << cnx->remote_lp);
1271
1272 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1273 veth_debug("cnx %d: woke queue for %s.\n",
1274 cnx->remote_lp, dev->name);
1275 netif_wake_queue(dev);
1276 }
1277 spin_unlock_irqrestore(&port->queue_lock, flags);
1278 }
1279 }
1280
1281 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1282 {
1283 int i;
1284
1285 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1286 struct net_device *dev = veth_dev[i];
1287 struct veth_port *port;
1288
1289 if (! dev)
1290 continue;
1291
1292 port = netdev_priv(dev);
1293
1294 /* If this cnx is not on the vlan for this port, continue */
1295 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1296 continue;
1297
1298 spin_lock(&port->queue_lock);
1299
1300 netif_stop_queue(dev);
1301 port->stopped_map |= (1 << cnx->remote_lp);
1302
1303 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1304 cnx->remote_lp, dev->name, port->stopped_map);
1305
1306 spin_unlock(&port->queue_lock);
1307 }
1308 }
1309
1310 static void veth_timed_reset(unsigned long ptr)
1311 {
1312 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1313 unsigned long trigger_time, flags;
1314
1315 /* FIXME is it possible this fires after veth_stop_connection()?
1316 * That would reschedule the statemachine for 5 seconds and probably
1317 * execute it after the module's been unloaded. Hmm. */
1318
1319 spin_lock_irqsave(&cnx->lock, flags);
1320
1321 if (cnx->outstanding_tx > 0) {
1322 trigger_time = cnx->last_contact + cnx->reset_timeout;
1323
1324 if (trigger_time < jiffies) {
1325 cnx->state |= VETH_STATE_RESET;
1326 veth_kick_statemachine(cnx);
1327 veth_error("%d packets not acked by LPAR %d within %d "
1328 "seconds, resetting.\n",
1329 cnx->outstanding_tx, cnx->remote_lp,
1330 cnx->reset_timeout / HZ);
1331 } else {
1332 /* Reschedule the timer */
1333 trigger_time = jiffies + cnx->reset_timeout;
1334 mod_timer(&cnx->reset_timer, trigger_time);
1335 }
1336 }
1337
1338 spin_unlock_irqrestore(&cnx->lock, flags);
1339 }
1340
1341 /*
1342 * Rx path
1343 */
1344
1345 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1346 {
1347 int wanted = 0;
1348 int i;
1349 unsigned long flags;
1350
1351 if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1352 return 1;
1353
1354 read_lock_irqsave(&port->mcast_gate, flags);
1355
1356 if (port->promiscuous) {
1357 wanted = 1;
1358 goto out;
1359 }
1360
1361 for (i = 0; i < port->num_mcast; ++i) {
1362 if (port->mcast_addr[i] == mac_addr) {
1363 wanted = 1;
1364 break;
1365 }
1366 }
1367
1368 out:
1369 read_unlock_irqrestore(&port->mcast_gate, flags);
1370
1371 return wanted;
1372 }
1373
1374 struct dma_chunk {
1375 u64 addr;
1376 u64 size;
1377 };
1378
1379 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1380
1381 static inline void veth_build_dma_list(struct dma_chunk *list,
1382 unsigned char *p, unsigned long length)
1383 {
1384 unsigned long done;
1385 int i = 1;
1386
1387 /* FIXME: skbs are continguous in real addresses. Do we
1388 * really need to break it into PAGE_SIZE chunks, or can we do
1389 * it just at the granularity of iSeries real->absolute
1390 * mapping? Indeed, given the way the allocator works, can we
1391 * count on them being absolutely contiguous? */
1392 list[0].addr = iseries_hv_addr(p);
1393 list[0].size = min(length,
1394 PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1395
1396 done = list[0].size;
1397 while (done < length) {
1398 list[i].addr = iseries_hv_addr(p + done);
1399 list[i].size = min(length-done, PAGE_SIZE);
1400 done += list[i].size;
1401 i++;
1402 }
1403 }
1404
1405 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1406 {
1407 HvLpEvent_Rc rc;
1408
1409 rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
1410 0, &cnx->pending_acks);
1411
1412 if (rc != HvLpEvent_Rc_Good)
1413 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1414 cnx->remote_lp, (int)rc);
1415
1416 cnx->num_pending_acks = 0;
1417 memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1418 }
1419
1420 static void veth_receive(struct veth_lpar_connection *cnx,
1421 struct veth_lpevent *event)
1422 {
1423 struct veth_frames_data *senddata = &event->u.frames_data;
1424 int startchunk = 0;
1425 int nchunks;
1426 unsigned long flags;
1427 HvLpDma_Rc rc;
1428
1429 do {
1430 u16 length = 0;
1431 struct sk_buff *skb;
1432 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1433 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1434 u64 dest;
1435 HvLpVirtualLanIndex vlan;
1436 struct net_device *dev;
1437 struct veth_port *port;
1438
1439 /* FIXME: do we need this? */
1440 memset(local_list, 0, sizeof(local_list));
1441 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1442
1443 /* a 0 address marks the end of the valid entries */
1444 if (senddata->addr[startchunk] == 0)
1445 break;
1446
1447 /* make sure that we have at least 1 EOF entry in the
1448 * remaining entries */
1449 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1450 veth_error("Missing EOF fragment in event "
1451 "eofmask = 0x%x startchunk = %d\n",
1452 (unsigned)senddata->eofmask,
1453 startchunk);
1454 break;
1455 }
1456
1457 /* build list of chunks in this frame */
1458 nchunks = 0;
1459 do {
1460 remote_list[nchunks].addr =
1461 (u64) senddata->addr[startchunk+nchunks] << 32;
1462 remote_list[nchunks].size =
1463 senddata->len[startchunk+nchunks];
1464 length += remote_list[nchunks].size;
1465 } while (! (senddata->eofmask &
1466 (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1467
1468 /* length == total length of all chunks */
1469 /* nchunks == # of chunks in this frame */
1470
1471 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1472 veth_error("Received oversize frame from LPAR %d "
1473 "(length = %d)\n",
1474 cnx->remote_lp, length);
1475 continue;
1476 }
1477
1478 skb = alloc_skb(length, GFP_ATOMIC);
1479 if (!skb)
1480 continue;
1481
1482 veth_build_dma_list(local_list, skb->data, length);
1483
1484 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1485 event->base_event.xSourceLp,
1486 HvLpDma_Direction_RemoteToLocal,
1487 cnx->src_inst,
1488 cnx->dst_inst,
1489 HvLpDma_AddressType_RealAddress,
1490 HvLpDma_AddressType_TceIndex,
1491 iseries_hv_addr(&local_list),
1492 iseries_hv_addr(&remote_list),
1493 length);
1494 if (rc != HvLpDma_Rc_Good) {
1495 dev_kfree_skb_irq(skb);
1496 continue;
1497 }
1498
1499 vlan = skb->data[9];
1500 dev = veth_dev[vlan];
1501 if (! dev) {
1502 /*
1503 * Some earlier versions of the driver sent
1504 * broadcasts down all connections, even to lpars
1505 * that weren't on the relevant vlan. So ignore
1506 * packets belonging to a vlan we're not on.
1507 * We can also be here if we receive packets while
1508 * the driver is going down, because then dev is NULL.
1509 */
1510 dev_kfree_skb_irq(skb);
1511 continue;
1512 }
1513
1514 port = netdev_priv(dev);
1515 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1516
1517 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1518 dev_kfree_skb_irq(skb);
1519 continue;
1520 }
1521 if (! veth_frame_wanted(port, dest)) {
1522 dev_kfree_skb_irq(skb);
1523 continue;
1524 }
1525
1526 skb_put(skb, length);
1527 skb->protocol = eth_type_trans(skb, dev);
1528 skb->ip_summed = CHECKSUM_NONE;
1529 netif_rx(skb); /* send it up */
1530 dev->stats.rx_packets++;
1531 dev->stats.rx_bytes += length;
1532 } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1533
1534 /* Ack it */
1535 spin_lock_irqsave(&cnx->lock, flags);
1536 BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1537
1538 cnx->pending_acks[cnx->num_pending_acks++] =
1539 event->base_event.xCorrelationToken;
1540
1541 if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1542 || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1543 veth_flush_acks(cnx);
1544
1545 spin_unlock_irqrestore(&cnx->lock, flags);
1546 }
1547
1548 static void veth_timed_ack(unsigned long ptr)
1549 {
1550 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1551 unsigned long flags;
1552
1553 /* Ack all the events */
1554 spin_lock_irqsave(&cnx->lock, flags);
1555 if (cnx->num_pending_acks > 0)
1556 veth_flush_acks(cnx);
1557
1558 /* Reschedule the timer */
1559 cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1560 add_timer(&cnx->ack_timer);
1561 spin_unlock_irqrestore(&cnx->lock, flags);
1562 }
1563
1564 static int veth_remove(struct vio_dev *vdev)
1565 {
1566 struct veth_lpar_connection *cnx;
1567 struct net_device *dev;
1568 struct veth_port *port;
1569 int i;
1570
1571 dev = veth_dev[vdev->unit_address];
1572
1573 if (! dev)
1574 return 0;
1575
1576 port = netdev_priv(dev);
1577
1578 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1579 cnx = veth_cnx[i];
1580
1581 if (cnx && (port->lpar_map & (1 << i))) {
1582 /* Drop our reference to connections on our VLAN */
1583 kobject_put(&cnx->kobject);
1584 }
1585 }
1586
1587 veth_dev[vdev->unit_address] = NULL;
1588 kobject_del(&port->kobject);
1589 kobject_put(&port->kobject);
1590 unregister_netdev(dev);
1591 free_netdev(dev);
1592
1593 return 0;
1594 }
1595
1596 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1597 {
1598 int i = vdev->unit_address;
1599 struct net_device *dev;
1600 struct veth_port *port;
1601
1602 dev = veth_probe_one(i, vdev);
1603 if (dev == NULL) {
1604 veth_remove(vdev);
1605 return 1;
1606 }
1607 veth_dev[i] = dev;
1608
1609 port = (struct veth_port*)netdev_priv(dev);
1610
1611 /* Start the state machine on each connection on this vlan. If we're
1612 * the first dev to do so this will commence link negotiation */
1613 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1614 struct veth_lpar_connection *cnx;
1615
1616 if (! (port->lpar_map & (1 << i)))
1617 continue;
1618
1619 cnx = veth_cnx[i];
1620 if (!cnx)
1621 continue;
1622
1623 kobject_get(&cnx->kobject);
1624 veth_kick_statemachine(cnx);
1625 }
1626
1627 return 0;
1628 }
1629
1630 /**
1631 * veth_device_table: Used by vio.c to match devices that we
1632 * support.
1633 */
1634 static struct vio_device_id veth_device_table[] __devinitdata = {
1635 { "network", "IBM,iSeries-l-lan" },
1636 { "", "" }
1637 };
1638 MODULE_DEVICE_TABLE(vio, veth_device_table);
1639
1640 static struct vio_driver veth_driver = {
1641 .id_table = veth_device_table,
1642 .probe = veth_probe,
1643 .remove = veth_remove,
1644 .driver = {
1645 .name = DRV_NAME,
1646 .owner = THIS_MODULE,
1647 }
1648 };
1649
1650 /*
1651 * Module initialization/cleanup
1652 */
1653
1654 static void __exit veth_module_cleanup(void)
1655 {
1656 int i;
1657 struct veth_lpar_connection *cnx;
1658
1659 /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1660 HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1661
1662 /* Make sure any work queued from Hypervisor callbacks is finished. */
1663 flush_scheduled_work();
1664
1665 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1666 cnx = veth_cnx[i];
1667
1668 if (!cnx)
1669 continue;
1670
1671 /* Remove the connection from sysfs */
1672 kobject_del(&cnx->kobject);
1673 /* Drop the driver's reference to the connection */
1674 kobject_put(&cnx->kobject);
1675 }
1676
1677 /* Unregister the driver, which will close all the netdevs and stop
1678 * the connections when they're no longer referenced. */
1679 vio_unregister_driver(&veth_driver);
1680 }
1681 module_exit(veth_module_cleanup);
1682
1683 static int __init veth_module_init(void)
1684 {
1685 int i;
1686 int rc;
1687
1688 if (!firmware_has_feature(FW_FEATURE_ISERIES))
1689 return -ENODEV;
1690
1691 this_lp = HvLpConfig_getLpIndex_outline();
1692
1693 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1694 rc = veth_init_connection(i);
1695 if (rc != 0)
1696 goto error;
1697 }
1698
1699 HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1700 &veth_handle_event);
1701
1702 rc = vio_register_driver(&veth_driver);
1703 if (rc != 0)
1704 goto error;
1705
1706 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1707 struct kobject *kobj;
1708
1709 if (!veth_cnx[i])
1710 continue;
1711
1712 kobj = &veth_cnx[i]->kobject;
1713 /* If the add failes, complain but otherwise continue */
1714 if (0 != driver_add_kobj(&veth_driver.driver, kobj,
1715 "cnx%.2d", veth_cnx[i]->remote_lp))
1716 veth_error("cnx %d: Failed adding to sysfs.\n", i);
1717 }
1718
1719 return 0;
1720
1721 error:
1722 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1723 veth_destroy_connection(veth_cnx[i]);
1724 }
1725
1726 return rc;
1727 }
1728 module_init(veth_module_init);
Linux with added FPC-III support