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remove unused TIF_NOTIFY_RESUME flag
[pv_ops_mirror.git] / drivers / net / iseries_veth.c
blob0433c41f9029b8c06cce63e7e0842756f06d8147
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 struct net_device_stats stats;
200 u64 mac_addr;
201 HvLpIndexMap lpar_map;
202
203 /* queue_lock protects the stopped_map and dev's queue. */
204 spinlock_t queue_lock;
205 HvLpIndexMap stopped_map;
206
207 /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
208 rwlock_t mcast_gate;
209 int promiscuous;
210 int num_mcast;
211 u64 mcast_addr[VETH_MAX_MCAST];
212
213 struct kobject kobject;
214 };
215
216 static HvLpIndex this_lp;
217 static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
218 static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
219
220 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
221 static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
222 static void veth_wake_queues(struct veth_lpar_connection *cnx);
223 static void veth_stop_queues(struct veth_lpar_connection *cnx);
224 static void veth_receive(struct veth_lpar_connection *, struct veth_lpevent *);
225 static void veth_release_connection(struct kobject *kobject);
226 static void veth_timed_ack(unsigned long ptr);
227 static void veth_timed_reset(unsigned long ptr);
228
229 /*
230 * Utility functions
231 */
232
233 #define veth_info(fmt, args...) \
234 printk(KERN_INFO DRV_NAME ": " fmt, ## args)
235
236 #define veth_error(fmt, args...) \
237 printk(KERN_ERR DRV_NAME ": Error: " fmt, ## args)
238
239 #ifdef DEBUG
240 #define veth_debug(fmt, args...) \
241 printk(KERN_DEBUG DRV_NAME ": " fmt, ## args)
242 #else
243 #define veth_debug(fmt, args...) do {} while (0)
244 #endif
245
246 /* You must hold the connection's lock when you call this function. */
247 static inline void veth_stack_push(struct veth_lpar_connection *cnx,
248 struct veth_msg *msg)
249 {
250 msg->next = cnx->msg_stack_head;
251 cnx->msg_stack_head = msg;
252 }
253
254 /* You must hold the connection's lock when you call this function. */
255 static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
256 {
257 struct veth_msg *msg;
258
259 msg = cnx->msg_stack_head;
260 if (msg)
261 cnx->msg_stack_head = cnx->msg_stack_head->next;
262
263 return msg;
264 }
265
266 /* You must hold the connection's lock when you call this function. */
267 static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
268 {
269 return cnx->msg_stack_head == NULL;
270 }
271
272 static inline HvLpEvent_Rc
273 veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
274 HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
275 u64 token,
276 u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
277 {
278 return HvCallEvent_signalLpEventFast(cnx->remote_lp,
279 HvLpEvent_Type_VirtualLan,
280 subtype, ackind, acktype,
281 cnx->src_inst,
282 cnx->dst_inst,
283 token, data1, data2, data3,
284 data4, data5);
285 }
286
287 static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
288 u16 subtype, u64 token, void *data)
289 {
290 u64 *p = (u64 *) data;
291
292 return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
293 HvLpEvent_AckType_ImmediateAck,
294 token, p[0], p[1], p[2], p[3], p[4]);
295 }
296
297 struct veth_allocation {
298 struct completion c;
299 int num;
300 };
301
302 static void veth_complete_allocation(void *parm, int number)
303 {
304 struct veth_allocation *vc = (struct veth_allocation *)parm;
305
306 vc->num = number;
307 complete(&vc->c);
308 }
309
310 static int veth_allocate_events(HvLpIndex rlp, int number)
311 {
312 struct veth_allocation vc = { COMPLETION_INITIALIZER(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, rc;
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);
849 cnx->kobject.ktype = &veth_lpar_connection_ktype;
850 rc = kobject_set_name(&cnx->kobject, "cnx%.2d", rlp);
851 if (rc != 0)
852 return rc;
853
854 msgs = kcalloc(VETH_NUMBUFFERS, sizeof(struct veth_msg), GFP_KERNEL);
855 if (! msgs) {
856 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
857 return -ENOMEM;
858 }
859
860 cnx->msgs = msgs;
861
862 for (i = 0; i < VETH_NUMBUFFERS; i++) {
863 msgs[i].token = i;
864 veth_stack_push(cnx, msgs + i);
865 }
866
867 cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
868
869 if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
870 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
871 return -ENOMEM;
872 }
873
874 cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
875 cnx->local_caps.ack_threshold = ACK_THRESHOLD;
876 cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
877
878 return 0;
879 }
880
881 static void veth_stop_connection(struct veth_lpar_connection *cnx)
882 {
883 if (!cnx)
884 return;
885
886 spin_lock_irq(&cnx->lock);
887 cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
888 veth_kick_statemachine(cnx);
889 spin_unlock_irq(&cnx->lock);
890
891 /* There's a slim chance the reset code has just queued the
892 * statemachine to run in five seconds. If so we need to cancel
893 * that and requeue the work to run now. */
894 if (cancel_delayed_work(&cnx->statemachine_wq)) {
895 spin_lock_irq(&cnx->lock);
896 veth_kick_statemachine(cnx);
897 spin_unlock_irq(&cnx->lock);
898 }
899
900 /* Wait for the state machine to run. */
901 flush_scheduled_work();
902 }
903
904 static void veth_destroy_connection(struct veth_lpar_connection *cnx)
905 {
906 if (!cnx)
907 return;
908
909 if (cnx->num_events > 0)
910 mf_deallocate_lp_events(cnx->remote_lp,
911 HvLpEvent_Type_VirtualLan,
912 cnx->num_events,
913 NULL, NULL);
914 if (cnx->num_ack_events > 0)
915 mf_deallocate_lp_events(cnx->remote_lp,
916 HvLpEvent_Type_VirtualLan,
917 cnx->num_ack_events,
918 NULL, NULL);
919
920 kfree(cnx->msgs);
921 veth_cnx[cnx->remote_lp] = NULL;
922 kfree(cnx);
923 }
924
925 static void veth_release_connection(struct kobject *kobj)
926 {
927 struct veth_lpar_connection *cnx;
928 cnx = container_of(kobj, struct veth_lpar_connection, kobject);
929 veth_stop_connection(cnx);
930 veth_destroy_connection(cnx);
931 }
932
933 /*
934 * net_device code
935 */
936
937 static int veth_open(struct net_device *dev)
938 {
939 struct veth_port *port = (struct veth_port *) dev->priv;
940
941 memset(&port->stats, 0, sizeof (port->stats));
942 netif_start_queue(dev);
943 return 0;
944 }
945
946 static int veth_close(struct net_device *dev)
947 {
948 netif_stop_queue(dev);
949 return 0;
950 }
951
952 static struct net_device_stats *veth_get_stats(struct net_device *dev)
953 {
954 struct veth_port *port = (struct veth_port *) dev->priv;
955
956 return &port->stats;
957 }
958
959 static int veth_change_mtu(struct net_device *dev, int new_mtu)
960 {
961 if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
962 return -EINVAL;
963 dev->mtu = new_mtu;
964 return 0;
965 }
966
967 static void veth_set_multicast_list(struct net_device *dev)
968 {
969 struct veth_port *port = (struct veth_port *) dev->priv;
970 unsigned long flags;
971
972 write_lock_irqsave(&port->mcast_gate, flags);
973
974 if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
975 (dev->mc_count > VETH_MAX_MCAST)) {
976 port->promiscuous = 1;
977 } else {
978 struct dev_mc_list *dmi = dev->mc_list;
979 int i;
980
981 port->promiscuous = 0;
982
983 /* Update table */
984 port->num_mcast = 0;
985
986 for (i = 0; i < dev->mc_count; i++) {
987 u8 *addr = dmi->dmi_addr;
988 u64 xaddr = 0;
989
990 if (addr[0] & 0x01) {/* multicast address? */
991 memcpy(&xaddr, addr, ETH_ALEN);
992 port->mcast_addr[port->num_mcast] = xaddr;
993 port->num_mcast++;
994 }
995 dmi = dmi->next;
996 }
997 }
998
999 write_unlock_irqrestore(&port->mcast_gate, flags);
1000 }
1001
1002 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1003 {
1004 strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
1005 info->driver[sizeof(info->driver) - 1] = '\0';
1006 strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
1007 info->version[sizeof(info->version) - 1] = '\0';
1008 }
1009
1010 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
1011 {
1012 ecmd->supported = (SUPPORTED_1000baseT_Full
1013 | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1014 ecmd->advertising = (SUPPORTED_1000baseT_Full
1015 | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1016 ecmd->port = PORT_FIBRE;
1017 ecmd->transceiver = XCVR_INTERNAL;
1018 ecmd->phy_address = 0;
1019 ecmd->speed = SPEED_1000;
1020 ecmd->duplex = DUPLEX_FULL;
1021 ecmd->autoneg = AUTONEG_ENABLE;
1022 ecmd->maxtxpkt = 120;
1023 ecmd->maxrxpkt = 120;
1024 return 0;
1025 }
1026
1027 static u32 veth_get_link(struct net_device *dev)
1028 {
1029 return 1;
1030 }
1031
1032 static const struct ethtool_ops ops = {
1033 .get_drvinfo = veth_get_drvinfo,
1034 .get_settings = veth_get_settings,
1035 .get_link = veth_get_link,
1036 };
1037
1038 static struct net_device * __init veth_probe_one(int vlan,
1039 struct vio_dev *vio_dev)
1040 {
1041 struct net_device *dev;
1042 struct veth_port *port;
1043 struct device *vdev = &vio_dev->dev;
1044 int i, rc;
1045 const unsigned char *mac_addr;
1046
1047 mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
1048 if (mac_addr == NULL)
1049 mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
1050 if (mac_addr == NULL) {
1051 veth_error("Unable to fetch MAC address from device tree.\n");
1052 return NULL;
1053 }
1054
1055 dev = alloc_etherdev(sizeof (struct veth_port));
1056 if (! dev) {
1057 veth_error("Unable to allocate net_device structure!\n");
1058 return NULL;
1059 }
1060
1061 port = (struct veth_port *) dev->priv;
1062
1063 spin_lock_init(&port->queue_lock);
1064 rwlock_init(&port->mcast_gate);
1065 port->stopped_map = 0;
1066
1067 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1068 HvLpVirtualLanIndexMap map;
1069
1070 if (i == this_lp)
1071 continue;
1072 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
1073 if (map & (0x8000 >> vlan))
1074 port->lpar_map |= (1 << i);
1075 }
1076 port->dev = vdev;
1077
1078 memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
1079
1080 dev->mtu = VETH_MAX_MTU;
1081
1082 memcpy(&port->mac_addr, mac_addr, ETH_ALEN);
1083
1084 dev->open = veth_open;
1085 dev->hard_start_xmit = veth_start_xmit;
1086 dev->stop = veth_close;
1087 dev->get_stats = veth_get_stats;
1088 dev->change_mtu = veth_change_mtu;
1089 dev->set_mac_address = NULL;
1090 dev->set_multicast_list = veth_set_multicast_list;
1091 SET_ETHTOOL_OPS(dev, &ops);
1092
1093 SET_NETDEV_DEV(dev, vdev);
1094
1095 rc = register_netdev(dev);
1096 if (rc != 0) {
1097 veth_error("Failed registering net device for vlan%d.\n", vlan);
1098 free_netdev(dev);
1099 return NULL;
1100 }
1101
1102 kobject_init(&port->kobject);
1103 port->kobject.parent = &dev->dev.kobj;
1104 port->kobject.ktype = &veth_port_ktype;
1105 kobject_set_name(&port->kobject, "veth_port");
1106 if (0 != kobject_add(&port->kobject))
1107 veth_error("Failed adding port for %s to sysfs.\n", dev->name);
1108
1109 veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
1110 dev->name, vlan, port->lpar_map);
1111
1112 return dev;
1113 }
1114
1115 /*
1116 * Tx path
1117 */
1118
1119 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
1120 struct net_device *dev)
1121 {
1122 struct veth_lpar_connection *cnx = veth_cnx[rlp];
1123 struct veth_port *port = (struct veth_port *) dev->priv;
1124 HvLpEvent_Rc rc;
1125 struct veth_msg *msg = NULL;
1126 unsigned long flags;
1127
1128 if (! cnx)
1129 return 0;
1130
1131 spin_lock_irqsave(&cnx->lock, flags);
1132
1133 if (! (cnx->state & VETH_STATE_READY))
1134 goto no_error;
1135
1136 if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
1137 goto drop;
1138
1139 msg = veth_stack_pop(cnx);
1140 if (! msg)
1141 goto drop;
1142
1143 msg->in_use = 1;
1144 msg->skb = skb_get(skb);
1145
1146 msg->data.addr[0] = dma_map_single(port->dev, skb->data,
1147 skb->len, DMA_TO_DEVICE);
1148
1149 if (dma_mapping_error(msg->data.addr[0]))
1150 goto recycle_and_drop;
1151
1152 msg->dev = port->dev;
1153 msg->data.len[0] = skb->len;
1154 msg->data.eofmask = 1 << VETH_EOF_SHIFT;
1155
1156 rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
1157
1158 if (rc != HvLpEvent_Rc_Good)
1159 goto recycle_and_drop;
1160
1161 /* If the timer's not already running, start it now. */
1162 if (0 == cnx->outstanding_tx)
1163 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
1164
1165 cnx->last_contact = jiffies;
1166 cnx->outstanding_tx++;
1167
1168 if (veth_stack_is_empty(cnx))
1169 veth_stop_queues(cnx);
1170
1171 no_error:
1172 spin_unlock_irqrestore(&cnx->lock, flags);
1173 return 0;
1174
1175 recycle_and_drop:
1176 veth_recycle_msg(cnx, msg);
1177 drop:
1178 spin_unlock_irqrestore(&cnx->lock, flags);
1179 return 1;
1180 }
1181
1182 static void veth_transmit_to_many(struct sk_buff *skb,
1183 HvLpIndexMap lpmask,
1184 struct net_device *dev)
1185 {
1186 struct veth_port *port = (struct veth_port *) dev->priv;
1187 int i, success, error;
1188
1189 success = error = 0;
1190
1191 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1192 if ((lpmask & (1 << i)) == 0)
1193 continue;
1194
1195 if (veth_transmit_to_one(skb, i, dev))
1196 error = 1;
1197 else
1198 success = 1;
1199 }
1200
1201 if (error)
1202 port->stats.tx_errors++;
1203
1204 if (success) {
1205 port->stats.tx_packets++;
1206 port->stats.tx_bytes += skb->len;
1207 }
1208 }
1209
1210 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1211 {
1212 unsigned char *frame = skb->data;
1213 struct veth_port *port = (struct veth_port *) dev->priv;
1214 HvLpIndexMap lpmask;
1215
1216 if (! (frame[0] & 0x01)) {
1217 /* unicast packet */
1218 HvLpIndex rlp = frame[5];
1219
1220 if ( ! ((1 << rlp) & port->lpar_map) ) {
1221 dev_kfree_skb(skb);
1222 return 0;
1223 }
1224
1225 lpmask = 1 << rlp;
1226 } else {
1227 lpmask = port->lpar_map;
1228 }
1229
1230 veth_transmit_to_many(skb, lpmask, dev);
1231
1232 dev_kfree_skb(skb);
1233
1234 return 0;
1235 }
1236
1237 /* You must hold the connection's lock when you call this function. */
1238 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1239 struct veth_msg *msg)
1240 {
1241 u32 dma_address, dma_length;
1242
1243 if (msg->in_use) {
1244 msg->in_use = 0;
1245 dma_address = msg->data.addr[0];
1246 dma_length = msg->data.len[0];
1247
1248 if (!dma_mapping_error(dma_address))
1249 dma_unmap_single(msg->dev, dma_address, dma_length,
1250 DMA_TO_DEVICE);
1251
1252 if (msg->skb) {
1253 dev_kfree_skb_any(msg->skb);
1254 msg->skb = NULL;
1255 }
1256
1257 memset(&msg->data, 0, sizeof(msg->data));
1258 veth_stack_push(cnx, msg);
1259 } else if (cnx->state & VETH_STATE_OPEN) {
1260 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1261 cnx->remote_lp, msg->token);
1262 }
1263 }
1264
1265 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1266 {
1267 int i;
1268
1269 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1270 struct net_device *dev = veth_dev[i];
1271 struct veth_port *port;
1272 unsigned long flags;
1273
1274 if (! dev)
1275 continue;
1276
1277 port = (struct veth_port *)dev->priv;
1278
1279 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1280 continue;
1281
1282 spin_lock_irqsave(&port->queue_lock, flags);
1283
1284 port->stopped_map &= ~(1 << cnx->remote_lp);
1285
1286 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1287 veth_debug("cnx %d: woke queue for %s.\n",
1288 cnx->remote_lp, dev->name);
1289 netif_wake_queue(dev);
1290 }
1291 spin_unlock_irqrestore(&port->queue_lock, flags);
1292 }
1293 }
1294
1295 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1296 {
1297 int i;
1298
1299 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1300 struct net_device *dev = veth_dev[i];
1301 struct veth_port *port;
1302
1303 if (! dev)
1304 continue;
1305
1306 port = (struct veth_port *)dev->priv;
1307
1308 /* If this cnx is not on the vlan for this port, continue */
1309 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1310 continue;
1311
1312 spin_lock(&port->queue_lock);
1313
1314 netif_stop_queue(dev);
1315 port->stopped_map |= (1 << cnx->remote_lp);
1316
1317 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1318 cnx->remote_lp, dev->name, port->stopped_map);
1319
1320 spin_unlock(&port->queue_lock);
1321 }
1322 }
1323
1324 static void veth_timed_reset(unsigned long ptr)
1325 {
1326 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1327 unsigned long trigger_time, flags;
1328
1329 /* FIXME is it possible this fires after veth_stop_connection()?
1330 * That would reschedule the statemachine for 5 seconds and probably
1331 * execute it after the module's been unloaded. Hmm. */
1332
1333 spin_lock_irqsave(&cnx->lock, flags);
1334
1335 if (cnx->outstanding_tx > 0) {
1336 trigger_time = cnx->last_contact + cnx->reset_timeout;
1337
1338 if (trigger_time < jiffies) {
1339 cnx->state |= VETH_STATE_RESET;
1340 veth_kick_statemachine(cnx);
1341 veth_error("%d packets not acked by LPAR %d within %d "
1342 "seconds, resetting.\n",
1343 cnx->outstanding_tx, cnx->remote_lp,
1344 cnx->reset_timeout / HZ);
1345 } else {
1346 /* Reschedule the timer */
1347 trigger_time = jiffies + cnx->reset_timeout;
1348 mod_timer(&cnx->reset_timer, trigger_time);
1349 }
1350 }
1351
1352 spin_unlock_irqrestore(&cnx->lock, flags);
1353 }
1354
1355 /*
1356 * Rx path
1357 */
1358
1359 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1360 {
1361 int wanted = 0;
1362 int i;
1363 unsigned long flags;
1364
1365 if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1366 return 1;
1367
1368 read_lock_irqsave(&port->mcast_gate, flags);
1369
1370 if (port->promiscuous) {
1371 wanted = 1;
1372 goto out;
1373 }
1374
1375 for (i = 0; i < port->num_mcast; ++i) {
1376 if (port->mcast_addr[i] == mac_addr) {
1377 wanted = 1;
1378 break;
1379 }
1380 }
1381
1382 out:
1383 read_unlock_irqrestore(&port->mcast_gate, flags);
1384
1385 return wanted;
1386 }
1387
1388 struct dma_chunk {
1389 u64 addr;
1390 u64 size;
1391 };
1392
1393 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1394
1395 static inline void veth_build_dma_list(struct dma_chunk *list,
1396 unsigned char *p, unsigned long length)
1397 {
1398 unsigned long done;
1399 int i = 1;
1400
1401 /* FIXME: skbs are continguous in real addresses. Do we
1402 * really need to break it into PAGE_SIZE chunks, or can we do
1403 * it just at the granularity of iSeries real->absolute
1404 * mapping? Indeed, given the way the allocator works, can we
1405 * count on them being absolutely contiguous? */
1406 list[0].addr = iseries_hv_addr(p);
1407 list[0].size = min(length,
1408 PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1409
1410 done = list[0].size;
1411 while (done < length) {
1412 list[i].addr = iseries_hv_addr(p + done);
1413 list[i].size = min(length-done, PAGE_SIZE);
1414 done += list[i].size;
1415 i++;
1416 }
1417 }
1418
1419 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1420 {
1421 HvLpEvent_Rc rc;
1422
1423 rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
1424 0, &cnx->pending_acks);
1425
1426 if (rc != HvLpEvent_Rc_Good)
1427 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1428 cnx->remote_lp, (int)rc);
1429
1430 cnx->num_pending_acks = 0;
1431 memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1432 }
1433
1434 static void veth_receive(struct veth_lpar_connection *cnx,
1435 struct veth_lpevent *event)
1436 {
1437 struct veth_frames_data *senddata = &event->u.frames_data;
1438 int startchunk = 0;
1439 int nchunks;
1440 unsigned long flags;
1441 HvLpDma_Rc rc;
1442
1443 do {
1444 u16 length = 0;
1445 struct sk_buff *skb;
1446 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1447 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1448 u64 dest;
1449 HvLpVirtualLanIndex vlan;
1450 struct net_device *dev;
1451 struct veth_port *port;
1452
1453 /* FIXME: do we need this? */
1454 memset(local_list, 0, sizeof(local_list));
1455 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1456
1457 /* a 0 address marks the end of the valid entries */
1458 if (senddata->addr[startchunk] == 0)
1459 break;
1460
1461 /* make sure that we have at least 1 EOF entry in the
1462 * remaining entries */
1463 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1464 veth_error("Missing EOF fragment in event "
1465 "eofmask = 0x%x startchunk = %d\n",
1466 (unsigned)senddata->eofmask,
1467 startchunk);
1468 break;
1469 }
1470
1471 /* build list of chunks in this frame */
1472 nchunks = 0;
1473 do {
1474 remote_list[nchunks].addr =
1475 (u64) senddata->addr[startchunk+nchunks] << 32;
1476 remote_list[nchunks].size =
1477 senddata->len[startchunk+nchunks];
1478 length += remote_list[nchunks].size;
1479 } while (! (senddata->eofmask &
1480 (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1481
1482 /* length == total length of all chunks */
1483 /* nchunks == # of chunks in this frame */
1484
1485 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1486 veth_error("Received oversize frame from LPAR %d "
1487 "(length = %d)\n",
1488 cnx->remote_lp, length);
1489 continue;
1490 }
1491
1492 skb = alloc_skb(length, GFP_ATOMIC);
1493 if (!skb)
1494 continue;
1495
1496 veth_build_dma_list(local_list, skb->data, length);
1497
1498 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1499 event->base_event.xSourceLp,
1500 HvLpDma_Direction_RemoteToLocal,
1501 cnx->src_inst,
1502 cnx->dst_inst,
1503 HvLpDma_AddressType_RealAddress,
1504 HvLpDma_AddressType_TceIndex,
1505 iseries_hv_addr(&local_list),
1506 iseries_hv_addr(&remote_list),
1507 length);
1508 if (rc != HvLpDma_Rc_Good) {
1509 dev_kfree_skb_irq(skb);
1510 continue;
1511 }
1512
1513 vlan = skb->data[9];
1514 dev = veth_dev[vlan];
1515 if (! dev) {
1516 /*
1517 * Some earlier versions of the driver sent
1518 * broadcasts down all connections, even to lpars
1519 * that weren't on the relevant vlan. So ignore
1520 * packets belonging to a vlan we're not on.
1521 * We can also be here if we receive packets while
1522 * the driver is going down, because then dev is NULL.
1523 */
1524 dev_kfree_skb_irq(skb);
1525 continue;
1526 }
1527
1528 port = (struct veth_port *)dev->priv;
1529 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1530
1531 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1532 dev_kfree_skb_irq(skb);
1533 continue;
1534 }
1535 if (! veth_frame_wanted(port, dest)) {
1536 dev_kfree_skb_irq(skb);
1537 continue;
1538 }
1539
1540 skb_put(skb, length);
1541 skb->protocol = eth_type_trans(skb, dev);
1542 skb->ip_summed = CHECKSUM_NONE;
1543 netif_rx(skb); /* send it up */
1544 port->stats.rx_packets++;
1545 port->stats.rx_bytes += length;
1546 } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1547
1548 /* Ack it */
1549 spin_lock_irqsave(&cnx->lock, flags);
1550 BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1551
1552 cnx->pending_acks[cnx->num_pending_acks++] =
1553 event->base_event.xCorrelationToken;
1554
1555 if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1556 || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1557 veth_flush_acks(cnx);
1558
1559 spin_unlock_irqrestore(&cnx->lock, flags);
1560 }
1561
1562 static void veth_timed_ack(unsigned long ptr)
1563 {
1564 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1565 unsigned long flags;
1566
1567 /* Ack all the events */
1568 spin_lock_irqsave(&cnx->lock, flags);
1569 if (cnx->num_pending_acks > 0)
1570 veth_flush_acks(cnx);
1571
1572 /* Reschedule the timer */
1573 cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1574 add_timer(&cnx->ack_timer);
1575 spin_unlock_irqrestore(&cnx->lock, flags);
1576 }
1577
1578 static int veth_remove(struct vio_dev *vdev)
1579 {
1580 struct veth_lpar_connection *cnx;
1581 struct net_device *dev;
1582 struct veth_port *port;
1583 int i;
1584
1585 dev = veth_dev[vdev->unit_address];
1586
1587 if (! dev)
1588 return 0;
1589
1590 port = netdev_priv(dev);
1591
1592 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1593 cnx = veth_cnx[i];
1594
1595 if (cnx && (port->lpar_map & (1 << i))) {
1596 /* Drop our reference to connections on our VLAN */
1597 kobject_put(&cnx->kobject);
1598 }
1599 }
1600
1601 veth_dev[vdev->unit_address] = NULL;
1602 kobject_del(&port->kobject);
1603 kobject_put(&port->kobject);
1604 unregister_netdev(dev);
1605 free_netdev(dev);
1606
1607 return 0;
1608 }
1609
1610 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1611 {
1612 int i = vdev->unit_address;
1613 struct net_device *dev;
1614 struct veth_port *port;
1615
1616 dev = veth_probe_one(i, vdev);
1617 if (dev == NULL) {
1618 veth_remove(vdev);
1619 return 1;
1620 }
1621 veth_dev[i] = dev;
1622
1623 port = (struct veth_port*)netdev_priv(dev);
1624
1625 /* Start the state machine on each connection on this vlan. If we're
1626 * the first dev to do so this will commence link negotiation */
1627 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1628 struct veth_lpar_connection *cnx;
1629
1630 if (! (port->lpar_map & (1 << i)))
1631 continue;
1632
1633 cnx = veth_cnx[i];
1634 if (!cnx)
1635 continue;
1636
1637 kobject_get(&cnx->kobject);
1638 veth_kick_statemachine(cnx);
1639 }
1640
1641 return 0;
1642 }
1643
1644 /**
1645 * veth_device_table: Used by vio.c to match devices that we
1646 * support.
1647 */
1648 static struct vio_device_id veth_device_table[] __devinitdata = {
1649 { "network", "IBM,iSeries-l-lan" },
1650 { "", "" }
1651 };
1652 MODULE_DEVICE_TABLE(vio, veth_device_table);
1653
1654 static struct vio_driver veth_driver = {
1655 .id_table = veth_device_table,
1656 .probe = veth_probe,
1657 .remove = veth_remove,
1658 .driver = {
1659 .name = DRV_NAME,
1660 .owner = THIS_MODULE,
1661 }
1662 };
1663
1664 /*
1665 * Module initialization/cleanup
1666 */
1667
1668 static void __exit veth_module_cleanup(void)
1669 {
1670 int i;
1671 struct veth_lpar_connection *cnx;
1672
1673 /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1674 HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1675
1676 /* Make sure any work queued from Hypervisor callbacks is finished. */
1677 flush_scheduled_work();
1678
1679 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1680 cnx = veth_cnx[i];
1681
1682 if (!cnx)
1683 continue;
1684
1685 /* Remove the connection from sysfs */
1686 kobject_del(&cnx->kobject);
1687 /* Drop the driver's reference to the connection */
1688 kobject_put(&cnx->kobject);
1689 }
1690
1691 /* Unregister the driver, which will close all the netdevs and stop
1692 * the connections when they're no longer referenced. */
1693 vio_unregister_driver(&veth_driver);
1694 }
1695 module_exit(veth_module_cleanup);
1696
1697 static int __init veth_module_init(void)
1698 {
1699 int i;
1700 int rc;
1701
1702 if (!firmware_has_feature(FW_FEATURE_ISERIES))
1703 return -ENODEV;
1704
1705 this_lp = HvLpConfig_getLpIndex_outline();
1706
1707 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1708 rc = veth_init_connection(i);
1709 if (rc != 0)
1710 goto error;
1711 }
1712
1713 HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1714 &veth_handle_event);
1715
1716 rc = vio_register_driver(&veth_driver);
1717 if (rc != 0)
1718 goto error;
1719
1720 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1721 struct kobject *kobj;
1722
1723 if (!veth_cnx[i])
1724 continue;
1725
1726 kobj = &veth_cnx[i]->kobject;
1727 kobj->parent = &veth_driver.driver.kobj;
1728 /* If the add failes, complain but otherwise continue */
1729 if (0 != kobject_add(kobj))
1730 veth_error("cnx %d: Failed adding to sysfs.\n", i);
1731 }
1732
1733 return 0;
1734
1735 error:
1736 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1737 veth_destroy_connection(veth_cnx[i]);
1738 }
1739
1740 return rc;
1741 }
1742 module_init(veth_module_init);
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