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USB: gadget: section mismatch warning fixed
[linux/fpc-iii.git] / drivers / net / iseries_veth.c
blobba1de5973fb2083fe669027d551ea98d427bf350
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 #include <linux/slab.h>
73
74 #include <asm/abs_addr.h>
75 #include <asm/iseries/mf.h>
76 #include <asm/uaccess.h>
77 #include <asm/firmware.h>
78 #include <asm/iseries/hv_lp_config.h>
79 #include <asm/iseries/hv_types.h>
80 #include <asm/iseries/hv_lp_event.h>
81 #include <asm/iommu.h>
82 #include <asm/vio.h>
83
84 #undef DEBUG
85
86 MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
87 MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
88 MODULE_LICENSE("GPL");
89
90 #define VETH_EVENT_CAP (0)
91 #define VETH_EVENT_FRAMES (1)
92 #define VETH_EVENT_MONITOR (2)
93 #define VETH_EVENT_FRAMES_ACK (3)
94
95 #define VETH_MAX_ACKS_PER_MSG (20)
96 #define VETH_MAX_FRAMES_PER_MSG (6)
97
98 struct veth_frames_data {
99 u32 addr[VETH_MAX_FRAMES_PER_MSG];
100 u16 len[VETH_MAX_FRAMES_PER_MSG];
101 u32 eofmask;
102 };
103 #define VETH_EOF_SHIFT (32-VETH_MAX_FRAMES_PER_MSG)
104
105 struct veth_frames_ack_data {
106 u16 token[VETH_MAX_ACKS_PER_MSG];
107 };
108
109 struct veth_cap_data {
110 u8 caps_version;
111 u8 rsvd1;
112 u16 num_buffers;
113 u16 ack_threshold;
114 u16 rsvd2;
115 u32 ack_timeout;
116 u32 rsvd3;
117 u64 rsvd4[3];
118 };
119
120 struct veth_lpevent {
121 struct HvLpEvent base_event;
122 union {
123 struct veth_cap_data caps_data;
124 struct veth_frames_data frames_data;
125 struct veth_frames_ack_data frames_ack_data;
126 } u;
127
128 };
129
130 #define DRV_NAME "iseries_veth"
131 #define DRV_VERSION "2.0"
132
133 #define VETH_NUMBUFFERS (120)
134 #define VETH_ACKTIMEOUT (1000000) /* microseconds */
135 #define VETH_MAX_MCAST (12)
136
137 #define VETH_MAX_MTU (9000)
138
139 #if VETH_NUMBUFFERS < 10
140 #define ACK_THRESHOLD (1)
141 #elif VETH_NUMBUFFERS < 20
142 #define ACK_THRESHOLD (4)
143 #elif VETH_NUMBUFFERS < 40
144 #define ACK_THRESHOLD (10)
145 #else
146 #define ACK_THRESHOLD (20)
147 #endif
148
149 #define VETH_STATE_SHUTDOWN (0x0001)
150 #define VETH_STATE_OPEN (0x0002)
151 #define VETH_STATE_RESET (0x0004)
152 #define VETH_STATE_SENTMON (0x0008)
153 #define VETH_STATE_SENTCAPS (0x0010)
154 #define VETH_STATE_GOTCAPACK (0x0020)
155 #define VETH_STATE_GOTCAPS (0x0040)
156 #define VETH_STATE_SENTCAPACK (0x0080)
157 #define VETH_STATE_READY (0x0100)
158
159 struct veth_msg {
160 struct veth_msg *next;
161 struct veth_frames_data data;
162 int token;
163 int in_use;
164 struct sk_buff *skb;
165 struct device *dev;
166 };
167
168 struct veth_lpar_connection {
169 HvLpIndex remote_lp;
170 struct delayed_work statemachine_wq;
171 struct veth_msg *msgs;
172 int num_events;
173 struct veth_cap_data local_caps;
174
175 struct kobject kobject;
176 struct timer_list ack_timer;
177
178 struct timer_list reset_timer;
179 unsigned int reset_timeout;
180 unsigned long last_contact;
181 int outstanding_tx;
182
183 spinlock_t lock;
184 unsigned long state;
185 HvLpInstanceId src_inst;
186 HvLpInstanceId dst_inst;
187 struct veth_lpevent cap_event, cap_ack_event;
188 u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
189 u32 num_pending_acks;
190
191 int num_ack_events;
192 struct veth_cap_data remote_caps;
193 u32 ack_timeout;
194
195 struct veth_msg *msg_stack_head;
196 };
197
198 struct veth_port {
199 struct device *dev;
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 =
313 { COMPLETION_INITIALIZER_ONSTACK(vc.c), 0 };
314
315 mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
316 sizeof(struct veth_lpevent), number,
317 &veth_complete_allocation, &vc);
318 wait_for_completion(&vc.c);
319
320 return vc.num;
321 }
322
323 /*
324 * sysfs support
325 */
326
327 struct veth_cnx_attribute {
328 struct attribute attr;
329 ssize_t (*show)(struct veth_lpar_connection *, char *buf);
330 ssize_t (*store)(struct veth_lpar_connection *, const char *buf);
331 };
332
333 static ssize_t veth_cnx_attribute_show(struct kobject *kobj,
334 struct attribute *attr, char *buf)
335 {
336 struct veth_cnx_attribute *cnx_attr;
337 struct veth_lpar_connection *cnx;
338
339 cnx_attr = container_of(attr, struct veth_cnx_attribute, attr);
340 cnx = container_of(kobj, struct veth_lpar_connection, kobject);
341
342 if (!cnx_attr->show)
343 return -EIO;
344
345 return cnx_attr->show(cnx, buf);
346 }
347
348 #define CUSTOM_CNX_ATTR(_name, _format, _expression) \
349 static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\
350 { \
351 return sprintf(buf, _format, _expression); \
352 } \
353 struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name)
354
355 #define SIMPLE_CNX_ATTR(_name) \
356 CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name)
357
358 SIMPLE_CNX_ATTR(outstanding_tx);
359 SIMPLE_CNX_ATTR(remote_lp);
360 SIMPLE_CNX_ATTR(num_events);
361 SIMPLE_CNX_ATTR(src_inst);
362 SIMPLE_CNX_ATTR(dst_inst);
363 SIMPLE_CNX_ATTR(num_pending_acks);
364 SIMPLE_CNX_ATTR(num_ack_events);
365 CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout));
366 CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout));
367 CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state);
368 CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ?
369 jiffies_to_msecs(jiffies - cnx->last_contact) : 0);
370
371 #define GET_CNX_ATTR(_name) (&veth_cnx_attr_##_name.attr)
372
373 static struct attribute *veth_cnx_default_attrs[] = {
374 GET_CNX_ATTR(outstanding_tx),
375 GET_CNX_ATTR(remote_lp),
376 GET_CNX_ATTR(num_events),
377 GET_CNX_ATTR(reset_timeout),
378 GET_CNX_ATTR(last_contact),
379 GET_CNX_ATTR(state),
380 GET_CNX_ATTR(src_inst),
381 GET_CNX_ATTR(dst_inst),
382 GET_CNX_ATTR(num_pending_acks),
383 GET_CNX_ATTR(num_ack_events),
384 GET_CNX_ATTR(ack_timeout),
385 NULL
386 };
387
388 static const struct sysfs_ops veth_cnx_sysfs_ops = {
389 .show = veth_cnx_attribute_show
390 };
391
392 static struct kobj_type veth_lpar_connection_ktype = {
393 .release = veth_release_connection,
394 .sysfs_ops = &veth_cnx_sysfs_ops,
395 .default_attrs = veth_cnx_default_attrs
396 };
397
398 struct veth_port_attribute {
399 struct attribute attr;
400 ssize_t (*show)(struct veth_port *, char *buf);
401 ssize_t (*store)(struct veth_port *, const char *buf);
402 };
403
404 static ssize_t veth_port_attribute_show(struct kobject *kobj,
405 struct attribute *attr, char *buf)
406 {
407 struct veth_port_attribute *port_attr;
408 struct veth_port *port;
409
410 port_attr = container_of(attr, struct veth_port_attribute, attr);
411 port = container_of(kobj, struct veth_port, kobject);
412
413 if (!port_attr->show)
414 return -EIO;
415
416 return port_attr->show(port, buf);
417 }
418
419 #define CUSTOM_PORT_ATTR(_name, _format, _expression) \
420 static ssize_t _name##_show(struct veth_port *port, char *buf) \
421 { \
422 return sprintf(buf, _format, _expression); \
423 } \
424 struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name)
425
426 #define SIMPLE_PORT_ATTR(_name) \
427 CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name)
428
429 SIMPLE_PORT_ATTR(promiscuous);
430 SIMPLE_PORT_ATTR(num_mcast);
431 CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map);
432 CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map);
433 CUSTOM_PORT_ATTR(mac_addr, "0x%llX\n", port->mac_addr);
434
435 #define GET_PORT_ATTR(_name) (&veth_port_attr_##_name.attr)
436 static struct attribute *veth_port_default_attrs[] = {
437 GET_PORT_ATTR(mac_addr),
438 GET_PORT_ATTR(lpar_map),
439 GET_PORT_ATTR(stopped_map),
440 GET_PORT_ATTR(promiscuous),
441 GET_PORT_ATTR(num_mcast),
442 NULL
443 };
444
445 static const struct sysfs_ops veth_port_sysfs_ops = {
446 .show = veth_port_attribute_show
447 };
448
449 static struct kobj_type veth_port_ktype = {
450 .sysfs_ops = &veth_port_sysfs_ops,
451 .default_attrs = veth_port_default_attrs
452 };
453
454 /*
455 * LPAR connection code
456 */
457
458 static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
459 {
460 schedule_delayed_work(&cnx->statemachine_wq, 0);
461 }
462
463 static void veth_take_cap(struct veth_lpar_connection *cnx,
464 struct veth_lpevent *event)
465 {
466 unsigned long flags;
467
468 spin_lock_irqsave(&cnx->lock, flags);
469 /* Receiving caps may mean the other end has just come up, so
470 * we need to reload the instance ID of the far end */
471 cnx->dst_inst =
472 HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
473 HvLpEvent_Type_VirtualLan);
474
475 if (cnx->state & VETH_STATE_GOTCAPS) {
476 veth_error("Received a second capabilities from LPAR %d.\n",
477 cnx->remote_lp);
478 event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
479 HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
480 } else {
481 memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
482 cnx->state |= VETH_STATE_GOTCAPS;
483 veth_kick_statemachine(cnx);
484 }
485 spin_unlock_irqrestore(&cnx->lock, flags);
486 }
487
488 static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
489 struct veth_lpevent *event)
490 {
491 unsigned long flags;
492
493 spin_lock_irqsave(&cnx->lock, flags);
494 if (cnx->state & VETH_STATE_GOTCAPACK) {
495 veth_error("Received a second capabilities ack from LPAR %d.\n",
496 cnx->remote_lp);
497 } else {
498 memcpy(&cnx->cap_ack_event, event,
499 sizeof(cnx->cap_ack_event));
500 cnx->state |= VETH_STATE_GOTCAPACK;
501 veth_kick_statemachine(cnx);
502 }
503 spin_unlock_irqrestore(&cnx->lock, flags);
504 }
505
506 static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
507 struct veth_lpevent *event)
508 {
509 unsigned long flags;
510
511 spin_lock_irqsave(&cnx->lock, flags);
512 veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
513
514 /* Avoid kicking the statemachine once we're shutdown.
515 * It's unnecessary and it could break veth_stop_connection(). */
516
517 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
518 cnx->state |= VETH_STATE_RESET;
519 veth_kick_statemachine(cnx);
520 }
521 spin_unlock_irqrestore(&cnx->lock, flags);
522 }
523
524 static void veth_handle_ack(struct veth_lpevent *event)
525 {
526 HvLpIndex rlp = event->base_event.xTargetLp;
527 struct veth_lpar_connection *cnx = veth_cnx[rlp];
528
529 BUG_ON(! cnx);
530
531 switch (event->base_event.xSubtype) {
532 case VETH_EVENT_CAP:
533 veth_take_cap_ack(cnx, event);
534 break;
535 case VETH_EVENT_MONITOR:
536 veth_take_monitor_ack(cnx, event);
537 break;
538 default:
539 veth_error("Unknown ack type %d from LPAR %d.\n",
540 event->base_event.xSubtype, rlp);
541 };
542 }
543
544 static void veth_handle_int(struct veth_lpevent *event)
545 {
546 HvLpIndex rlp = event->base_event.xSourceLp;
547 struct veth_lpar_connection *cnx = veth_cnx[rlp];
548 unsigned long flags;
549 int i, acked = 0;
550
551 BUG_ON(! cnx);
552
553 switch (event->base_event.xSubtype) {
554 case VETH_EVENT_CAP:
555 veth_take_cap(cnx, event);
556 break;
557 case VETH_EVENT_MONITOR:
558 /* do nothing... this'll hang out here til we're dead,
559 * and the hypervisor will return it for us. */
560 break;
561 case VETH_EVENT_FRAMES_ACK:
562 spin_lock_irqsave(&cnx->lock, flags);
563
564 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
565 u16 msgnum = event->u.frames_ack_data.token[i];
566
567 if (msgnum < VETH_NUMBUFFERS) {
568 veth_recycle_msg(cnx, cnx->msgs + msgnum);
569 cnx->outstanding_tx--;
570 acked++;
571 }
572 }
573
574 if (acked > 0) {
575 cnx->last_contact = jiffies;
576 veth_wake_queues(cnx);
577 }
578
579 spin_unlock_irqrestore(&cnx->lock, flags);
580 break;
581 case VETH_EVENT_FRAMES:
582 veth_receive(cnx, event);
583 break;
584 default:
585 veth_error("Unknown interrupt type %d from LPAR %d.\n",
586 event->base_event.xSubtype, rlp);
587 };
588 }
589
590 static void veth_handle_event(struct HvLpEvent *event)
591 {
592 struct veth_lpevent *veth_event = (struct veth_lpevent *)event;
593
594 if (hvlpevent_is_ack(event))
595 veth_handle_ack(veth_event);
596 else
597 veth_handle_int(veth_event);
598 }
599
600 static int veth_process_caps(struct veth_lpar_connection *cnx)
601 {
602 struct veth_cap_data *remote_caps = &cnx->remote_caps;
603 int num_acks_needed;
604
605 /* Convert timer to jiffies */
606 cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
607
608 if ( (remote_caps->num_buffers == 0) ||
609 (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG) ||
610 (remote_caps->ack_threshold == 0) ||
611 (cnx->ack_timeout == 0) ) {
612 veth_error("Received incompatible capabilities from LPAR %d.\n",
613 cnx->remote_lp);
614 return HvLpEvent_Rc_InvalidSubtypeData;
615 }
616
617 num_acks_needed = (remote_caps->num_buffers
618 / remote_caps->ack_threshold) + 1;
619
620 /* FIXME: locking on num_ack_events? */
621 if (cnx->num_ack_events < num_acks_needed) {
622 int num;
623
624 num = veth_allocate_events(cnx->remote_lp,
625 num_acks_needed-cnx->num_ack_events);
626 if (num > 0)
627 cnx->num_ack_events += num;
628
629 if (cnx->num_ack_events < num_acks_needed) {
630 veth_error("Couldn't allocate enough ack events "
631 "for LPAR %d.\n", cnx->remote_lp);
632
633 return HvLpEvent_Rc_BufferNotAvailable;
634 }
635 }
636
637
638 return HvLpEvent_Rc_Good;
639 }
640
641 /* FIXME: The gotos here are a bit dubious */
642 static void veth_statemachine(struct work_struct *work)
643 {
644 struct veth_lpar_connection *cnx =
645 container_of(work, struct veth_lpar_connection,
646 statemachine_wq.work);
647 int rlp = cnx->remote_lp;
648 int rc;
649
650 spin_lock_irq(&cnx->lock);
651
652 restart:
653 if (cnx->state & VETH_STATE_RESET) {
654 if (cnx->state & VETH_STATE_OPEN)
655 HvCallEvent_closeLpEventPath(cnx->remote_lp,
656 HvLpEvent_Type_VirtualLan);
657
658 /*
659 * Reset ack data. This prevents the ack_timer actually
660 * doing anything, even if it runs one more time when
661 * we drop the lock below.
662 */
663 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
664 cnx->num_pending_acks = 0;
665
666 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
667 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
668 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
669 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
670
671 /* Clean up any leftover messages */
672 if (cnx->msgs) {
673 int i;
674 for (i = 0; i < VETH_NUMBUFFERS; ++i)
675 veth_recycle_msg(cnx, cnx->msgs + i);
676 }
677
678 cnx->outstanding_tx = 0;
679 veth_wake_queues(cnx);
680
681 /* Drop the lock so we can do stuff that might sleep or
682 * take other locks. */
683 spin_unlock_irq(&cnx->lock);
684
685 del_timer_sync(&cnx->ack_timer);
686 del_timer_sync(&cnx->reset_timer);
687
688 spin_lock_irq(&cnx->lock);
689
690 if (cnx->state & VETH_STATE_RESET)
691 goto restart;
692
693 /* Hack, wait for the other end to reset itself. */
694 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
695 schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
696 goto out;
697 }
698 }
699
700 if (cnx->state & VETH_STATE_SHUTDOWN)
701 /* It's all over, do nothing */
702 goto out;
703
704 if ( !(cnx->state & VETH_STATE_OPEN) ) {
705 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
706 goto cant_cope;
707
708 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
709 cnx->src_inst =
710 HvCallEvent_getSourceLpInstanceId(rlp,
711 HvLpEvent_Type_VirtualLan);
712 cnx->dst_inst =
713 HvCallEvent_getTargetLpInstanceId(rlp,
714 HvLpEvent_Type_VirtualLan);
715 cnx->state |= VETH_STATE_OPEN;
716 }
717
718 if ( (cnx->state & VETH_STATE_OPEN) &&
719 !(cnx->state & VETH_STATE_SENTMON) ) {
720 rc = veth_signalevent(cnx, VETH_EVENT_MONITOR,
721 HvLpEvent_AckInd_DoAck,
722 HvLpEvent_AckType_DeferredAck,
723 0, 0, 0, 0, 0, 0);
724
725 if (rc == HvLpEvent_Rc_Good) {
726 cnx->state |= VETH_STATE_SENTMON;
727 } else {
728 if ( (rc != HvLpEvent_Rc_PartitionDead) &&
729 (rc != HvLpEvent_Rc_PathClosed) )
730 veth_error("Error sending monitor to LPAR %d, "
731 "rc = %d\n", rlp, rc);
732
733 /* Oh well, hope we get a cap from the other
734 * end and do better when that kicks us */
735 goto out;
736 }
737 }
738
739 if ( (cnx->state & VETH_STATE_OPEN) &&
740 !(cnx->state & VETH_STATE_SENTCAPS)) {
741 u64 *rawcap = (u64 *)&cnx->local_caps;
742
743 rc = veth_signalevent(cnx, VETH_EVENT_CAP,
744 HvLpEvent_AckInd_DoAck,
745 HvLpEvent_AckType_ImmediateAck,
746 0, rawcap[0], rawcap[1], rawcap[2],
747 rawcap[3], rawcap[4]);
748
749 if (rc == HvLpEvent_Rc_Good) {
750 cnx->state |= VETH_STATE_SENTCAPS;
751 } else {
752 if ( (rc != HvLpEvent_Rc_PartitionDead) &&
753 (rc != HvLpEvent_Rc_PathClosed) )
754 veth_error("Error sending caps to LPAR %d, "
755 "rc = %d\n", rlp, rc);
756
757 /* Oh well, hope we get a cap from the other
758 * end and do better when that kicks us */
759 goto out;
760 }
761 }
762
763 if ((cnx->state & VETH_STATE_GOTCAPS) &&
764 !(cnx->state & VETH_STATE_SENTCAPACK)) {
765 struct veth_cap_data *remote_caps = &cnx->remote_caps;
766
767 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
768 sizeof(*remote_caps));
769
770 spin_unlock_irq(&cnx->lock);
771 rc = veth_process_caps(cnx);
772 spin_lock_irq(&cnx->lock);
773
774 /* We dropped the lock, so recheck for anything which
775 * might mess us up */
776 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
777 goto restart;
778
779 cnx->cap_event.base_event.xRc = rc;
780 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
781 if (rc == HvLpEvent_Rc_Good)
782 cnx->state |= VETH_STATE_SENTCAPACK;
783 else
784 goto cant_cope;
785 }
786
787 if ((cnx->state & VETH_STATE_GOTCAPACK) &&
788 (cnx->state & VETH_STATE_GOTCAPS) &&
789 !(cnx->state & VETH_STATE_READY)) {
790 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
791 /* Start the ACK timer */
792 cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
793 add_timer(&cnx->ack_timer);
794 cnx->state |= VETH_STATE_READY;
795 } else {
796 veth_error("Caps rejected by LPAR %d, rc = %d\n",
797 rlp, cnx->cap_ack_event.base_event.xRc);
798 goto cant_cope;
799 }
800 }
801
802 out:
803 spin_unlock_irq(&cnx->lock);
804 return;
805
806 cant_cope:
807 /* FIXME: we get here if something happens we really can't
808 * cope with. The link will never work once we get here, and
809 * all we can do is not lock the rest of the system up */
810 veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
811 " (state = 0x%04lx)\n", rlp, cnx->state);
812 cnx->state |= VETH_STATE_SHUTDOWN;
813 spin_unlock_irq(&cnx->lock);
814 }
815
816 static int veth_init_connection(u8 rlp)
817 {
818 struct veth_lpar_connection *cnx;
819 struct veth_msg *msgs;
820 int i;
821
822 if ( (rlp == this_lp) ||
823 ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
824 return 0;
825
826 cnx = kzalloc(sizeof(*cnx), GFP_KERNEL);
827 if (! cnx)
828 return -ENOMEM;
829
830 cnx->remote_lp = rlp;
831 spin_lock_init(&cnx->lock);
832 INIT_DELAYED_WORK(&cnx->statemachine_wq, veth_statemachine);
833
834 init_timer(&cnx->ack_timer);
835 cnx->ack_timer.function = veth_timed_ack;
836 cnx->ack_timer.data = (unsigned long) cnx;
837
838 init_timer(&cnx->reset_timer);
839 cnx->reset_timer.function = veth_timed_reset;
840 cnx->reset_timer.data = (unsigned long) cnx;
841 cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
842
843 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
844
845 veth_cnx[rlp] = cnx;
846
847 /* This gets us 1 reference, which is held on behalf of the driver
848 * infrastructure. It's released at module unload. */
849 kobject_init(&cnx->kobject, &veth_lpar_connection_ktype);
850
851 msgs = kcalloc(VETH_NUMBUFFERS, sizeof(struct veth_msg), GFP_KERNEL);
852 if (! msgs) {
853 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
854 return -ENOMEM;
855 }
856
857 cnx->msgs = msgs;
858
859 for (i = 0; i < VETH_NUMBUFFERS; i++) {
860 msgs[i].token = i;
861 veth_stack_push(cnx, msgs + i);
862 }
863
864 cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
865
866 if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
867 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
868 return -ENOMEM;
869 }
870
871 cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
872 cnx->local_caps.ack_threshold = ACK_THRESHOLD;
873 cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
874
875 return 0;
876 }
877
878 static void veth_stop_connection(struct veth_lpar_connection *cnx)
879 {
880 if (!cnx)
881 return;
882
883 spin_lock_irq(&cnx->lock);
884 cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
885 veth_kick_statemachine(cnx);
886 spin_unlock_irq(&cnx->lock);
887
888 /* There's a slim chance the reset code has just queued the
889 * statemachine to run in five seconds. If so we need to cancel
890 * that and requeue the work to run now. */
891 if (cancel_delayed_work(&cnx->statemachine_wq)) {
892 spin_lock_irq(&cnx->lock);
893 veth_kick_statemachine(cnx);
894 spin_unlock_irq(&cnx->lock);
895 }
896
897 /* Wait for the state machine to run. */
898 flush_scheduled_work();
899 }
900
901 static void veth_destroy_connection(struct veth_lpar_connection *cnx)
902 {
903 if (!cnx)
904 return;
905
906 if (cnx->num_events > 0)
907 mf_deallocate_lp_events(cnx->remote_lp,
908 HvLpEvent_Type_VirtualLan,
909 cnx->num_events,
910 NULL, NULL);
911 if (cnx->num_ack_events > 0)
912 mf_deallocate_lp_events(cnx->remote_lp,
913 HvLpEvent_Type_VirtualLan,
914 cnx->num_ack_events,
915 NULL, NULL);
916
917 kfree(cnx->msgs);
918 veth_cnx[cnx->remote_lp] = NULL;
919 kfree(cnx);
920 }
921
922 static void veth_release_connection(struct kobject *kobj)
923 {
924 struct veth_lpar_connection *cnx;
925 cnx = container_of(kobj, struct veth_lpar_connection, kobject);
926 veth_stop_connection(cnx);
927 veth_destroy_connection(cnx);
928 }
929
930 /*
931 * net_device code
932 */
933
934 static int veth_open(struct net_device *dev)
935 {
936 netif_start_queue(dev);
937 return 0;
938 }
939
940 static int veth_close(struct net_device *dev)
941 {
942 netif_stop_queue(dev);
943 return 0;
944 }
945
946 static int veth_change_mtu(struct net_device *dev, int new_mtu)
947 {
948 if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
949 return -EINVAL;
950 dev->mtu = new_mtu;
951 return 0;
952 }
953
954 static void veth_set_multicast_list(struct net_device *dev)
955 {
956 struct veth_port *port = netdev_priv(dev);
957 unsigned long flags;
958
959 write_lock_irqsave(&port->mcast_gate, flags);
960
961 if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
962 (netdev_mc_count(dev) > VETH_MAX_MCAST)) {
963 port->promiscuous = 1;
964 } else {
965 struct netdev_hw_addr *ha;
966
967 port->promiscuous = 0;
968
969 /* Update table */
970 port->num_mcast = 0;
971
972 netdev_for_each_mc_addr(ha, dev) {
973 u8 *addr = ha->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 }
982 }
983
984 write_unlock_irqrestore(&port->mcast_gate, flags);
985 }
986
987 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
988 {
989 strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
990 info->driver[sizeof(info->driver) - 1] = '\0';
991 strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
992 info->version[sizeof(info->version) - 1] = '\0';
993 }
994
995 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
996 {
997 ecmd->supported = (SUPPORTED_1000baseT_Full
998 | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
999 ecmd->advertising = (SUPPORTED_1000baseT_Full
1000 | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1001 ecmd->port = PORT_FIBRE;
1002 ecmd->transceiver = XCVR_INTERNAL;
1003 ecmd->phy_address = 0;
1004 ecmd->speed = SPEED_1000;
1005 ecmd->duplex = DUPLEX_FULL;
1006 ecmd->autoneg = AUTONEG_ENABLE;
1007 ecmd->maxtxpkt = 120;
1008 ecmd->maxrxpkt = 120;
1009 return 0;
1010 }
1011
1012 static u32 veth_get_link(struct net_device *dev)
1013 {
1014 return 1;
1015 }
1016
1017 static const struct ethtool_ops ops = {
1018 .get_drvinfo = veth_get_drvinfo,
1019 .get_settings = veth_get_settings,
1020 .get_link = veth_get_link,
1021 };
1022
1023 static const struct net_device_ops veth_netdev_ops = {
1024 .ndo_open = veth_open,
1025 .ndo_stop = veth_close,
1026 .ndo_start_xmit = veth_start_xmit,
1027 .ndo_change_mtu = veth_change_mtu,
1028 .ndo_set_multicast_list = veth_set_multicast_list,
1029 .ndo_set_mac_address = NULL,
1030 .ndo_validate_addr = eth_validate_addr,
1031 };
1032
1033 static struct net_device *veth_probe_one(int vlan,
1034 struct vio_dev *vio_dev)
1035 {
1036 struct net_device *dev;
1037 struct veth_port *port;
1038 struct device *vdev = &vio_dev->dev;
1039 int i, rc;
1040 const unsigned char *mac_addr;
1041
1042 mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
1043 if (mac_addr == NULL)
1044 mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
1045 if (mac_addr == NULL) {
1046 veth_error("Unable to fetch MAC address from device tree.\n");
1047 return NULL;
1048 }
1049
1050 dev = alloc_etherdev(sizeof (struct veth_port));
1051 if (! dev) {
1052 veth_error("Unable to allocate net_device structure!\n");
1053 return NULL;
1054 }
1055
1056 port = netdev_priv(dev);
1057
1058 spin_lock_init(&port->queue_lock);
1059 rwlock_init(&port->mcast_gate);
1060 port->stopped_map = 0;
1061
1062 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1063 HvLpVirtualLanIndexMap map;
1064
1065 if (i == this_lp)
1066 continue;
1067 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
1068 if (map & (0x8000 >> vlan))
1069 port->lpar_map |= (1 << i);
1070 }
1071 port->dev = vdev;
1072
1073 memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
1074
1075 dev->mtu = VETH_MAX_MTU;
1076
1077 memcpy(&port->mac_addr, mac_addr, ETH_ALEN);
1078
1079 dev->netdev_ops = &veth_netdev_ops;
1080 SET_ETHTOOL_OPS(dev, &ops);
1081
1082 SET_NETDEV_DEV(dev, vdev);
1083
1084 rc = register_netdev(dev);
1085 if (rc != 0) {
1086 veth_error("Failed registering net device for vlan%d.\n", vlan);
1087 free_netdev(dev);
1088 return NULL;
1089 }
1090
1091 kobject_init(&port->kobject, &veth_port_ktype);
1092 if (0 != kobject_add(&port->kobject, &dev->dev.kobj, "veth_port"))
1093 veth_error("Failed adding port for %s to sysfs.\n", dev->name);
1094
1095 veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
1096 dev->name, vlan, port->lpar_map);
1097
1098 return dev;
1099 }
1100
1101 /*
1102 * Tx path
1103 */
1104
1105 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
1106 struct net_device *dev)
1107 {
1108 struct veth_lpar_connection *cnx = veth_cnx[rlp];
1109 struct veth_port *port = netdev_priv(dev);
1110 HvLpEvent_Rc rc;
1111 struct veth_msg *msg = NULL;
1112 unsigned long flags;
1113
1114 if (! cnx)
1115 return 0;
1116
1117 spin_lock_irqsave(&cnx->lock, flags);
1118
1119 if (! (cnx->state & VETH_STATE_READY))
1120 goto no_error;
1121
1122 if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
1123 goto drop;
1124
1125 msg = veth_stack_pop(cnx);
1126 if (! msg)
1127 goto drop;
1128
1129 msg->in_use = 1;
1130 msg->skb = skb_get(skb);
1131
1132 msg->data.addr[0] = dma_map_single(port->dev, skb->data,
1133 skb->len, DMA_TO_DEVICE);
1134
1135 if (dma_mapping_error(port->dev, msg->data.addr[0]))
1136 goto recycle_and_drop;
1137
1138 msg->dev = port->dev;
1139 msg->data.len[0] = skb->len;
1140 msg->data.eofmask = 1 << VETH_EOF_SHIFT;
1141
1142 rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
1143
1144 if (rc != HvLpEvent_Rc_Good)
1145 goto recycle_and_drop;
1146
1147 /* If the timer's not already running, start it now. */
1148 if (0 == cnx->outstanding_tx)
1149 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
1150
1151 cnx->last_contact = jiffies;
1152 cnx->outstanding_tx++;
1153
1154 if (veth_stack_is_empty(cnx))
1155 veth_stop_queues(cnx);
1156
1157 no_error:
1158 spin_unlock_irqrestore(&cnx->lock, flags);
1159 return 0;
1160
1161 recycle_and_drop:
1162 veth_recycle_msg(cnx, msg);
1163 drop:
1164 spin_unlock_irqrestore(&cnx->lock, flags);
1165 return 1;
1166 }
1167
1168 static void veth_transmit_to_many(struct sk_buff *skb,
1169 HvLpIndexMap lpmask,
1170 struct net_device *dev)
1171 {
1172 int i, success, error;
1173
1174 success = error = 0;
1175
1176 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1177 if ((lpmask & (1 << i)) == 0)
1178 continue;
1179
1180 if (veth_transmit_to_one(skb, i, dev))
1181 error = 1;
1182 else
1183 success = 1;
1184 }
1185
1186 if (error)
1187 dev->stats.tx_errors++;
1188
1189 if (success) {
1190 dev->stats.tx_packets++;
1191 dev->stats.tx_bytes += skb->len;
1192 }
1193 }
1194
1195 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1196 {
1197 unsigned char *frame = skb->data;
1198 struct veth_port *port = netdev_priv(dev);
1199 HvLpIndexMap lpmask;
1200
1201 if (! (frame[0] & 0x01)) {
1202 /* unicast packet */
1203 HvLpIndex rlp = frame[5];
1204
1205 if ( ! ((1 << rlp) & port->lpar_map) ) {
1206 dev_kfree_skb(skb);
1207 return NETDEV_TX_OK;
1208 }
1209
1210 lpmask = 1 << rlp;
1211 } else {
1212 lpmask = port->lpar_map;
1213 }
1214
1215 veth_transmit_to_many(skb, lpmask, dev);
1216
1217 dev_kfree_skb(skb);
1218
1219 return NETDEV_TX_OK;
1220 }
1221
1222 /* You must hold the connection's lock when you call this function. */
1223 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1224 struct veth_msg *msg)
1225 {
1226 u32 dma_address, dma_length;
1227
1228 if (msg->in_use) {
1229 msg->in_use = 0;
1230 dma_address = msg->data.addr[0];
1231 dma_length = msg->data.len[0];
1232
1233 if (!dma_mapping_error(msg->dev, dma_address))
1234 dma_unmap_single(msg->dev, dma_address, dma_length,
1235 DMA_TO_DEVICE);
1236
1237 if (msg->skb) {
1238 dev_kfree_skb_any(msg->skb);
1239 msg->skb = NULL;
1240 }
1241
1242 memset(&msg->data, 0, sizeof(msg->data));
1243 veth_stack_push(cnx, msg);
1244 } else if (cnx->state & VETH_STATE_OPEN) {
1245 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1246 cnx->remote_lp, msg->token);
1247 }
1248 }
1249
1250 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1251 {
1252 int i;
1253
1254 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1255 struct net_device *dev = veth_dev[i];
1256 struct veth_port *port;
1257 unsigned long flags;
1258
1259 if (! dev)
1260 continue;
1261
1262 port = netdev_priv(dev);
1263
1264 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1265 continue;
1266
1267 spin_lock_irqsave(&port->queue_lock, flags);
1268
1269 port->stopped_map &= ~(1 << cnx->remote_lp);
1270
1271 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1272 veth_debug("cnx %d: woke queue for %s.\n",
1273 cnx->remote_lp, dev->name);
1274 netif_wake_queue(dev);
1275 }
1276 spin_unlock_irqrestore(&port->queue_lock, flags);
1277 }
1278 }
1279
1280 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1281 {
1282 int i;
1283
1284 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1285 struct net_device *dev = veth_dev[i];
1286 struct veth_port *port;
1287
1288 if (! dev)
1289 continue;
1290
1291 port = netdev_priv(dev);
1292
1293 /* If this cnx is not on the vlan for this port, continue */
1294 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1295 continue;
1296
1297 spin_lock(&port->queue_lock);
1298
1299 netif_stop_queue(dev);
1300 port->stopped_map |= (1 << cnx->remote_lp);
1301
1302 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1303 cnx->remote_lp, dev->name, port->stopped_map);
1304
1305 spin_unlock(&port->queue_lock);
1306 }
1307 }
1308
1309 static void veth_timed_reset(unsigned long ptr)
1310 {
1311 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1312 unsigned long trigger_time, flags;
1313
1314 /* FIXME is it possible this fires after veth_stop_connection()?
1315 * That would reschedule the statemachine for 5 seconds and probably
1316 * execute it after the module's been unloaded. Hmm. */
1317
1318 spin_lock_irqsave(&cnx->lock, flags);
1319
1320 if (cnx->outstanding_tx > 0) {
1321 trigger_time = cnx->last_contact + cnx->reset_timeout;
1322
1323 if (trigger_time < jiffies) {
1324 cnx->state |= VETH_STATE_RESET;
1325 veth_kick_statemachine(cnx);
1326 veth_error("%d packets not acked by LPAR %d within %d "
1327 "seconds, resetting.\n",
1328 cnx->outstanding_tx, cnx->remote_lp,
1329 cnx->reset_timeout / HZ);
1330 } else {
1331 /* Reschedule the timer */
1332 trigger_time = jiffies + cnx->reset_timeout;
1333 mod_timer(&cnx->reset_timer, trigger_time);
1334 }
1335 }
1336
1337 spin_unlock_irqrestore(&cnx->lock, flags);
1338 }
1339
1340 /*
1341 * Rx path
1342 */
1343
1344 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1345 {
1346 int wanted = 0;
1347 int i;
1348 unsigned long flags;
1349
1350 if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1351 return 1;
1352
1353 read_lock_irqsave(&port->mcast_gate, flags);
1354
1355 if (port->promiscuous) {
1356 wanted = 1;
1357 goto out;
1358 }
1359
1360 for (i = 0; i < port->num_mcast; ++i) {
1361 if (port->mcast_addr[i] == mac_addr) {
1362 wanted = 1;
1363 break;
1364 }
1365 }
1366
1367 out:
1368 read_unlock_irqrestore(&port->mcast_gate, flags);
1369
1370 return wanted;
1371 }
1372
1373 struct dma_chunk {
1374 u64 addr;
1375 u64 size;
1376 };
1377
1378 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1379
1380 static inline void veth_build_dma_list(struct dma_chunk *list,
1381 unsigned char *p, unsigned long length)
1382 {
1383 unsigned long done;
1384 int i = 1;
1385
1386 /* FIXME: skbs are contiguous in real addresses. Do we
1387 * really need to break it into PAGE_SIZE chunks, or can we do
1388 * it just at the granularity of iSeries real->absolute
1389 * mapping? Indeed, given the way the allocator works, can we
1390 * count on them being absolutely contiguous? */
1391 list[0].addr = iseries_hv_addr(p);
1392 list[0].size = min(length,
1393 PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1394
1395 done = list[0].size;
1396 while (done < length) {
1397 list[i].addr = iseries_hv_addr(p + done);
1398 list[i].size = min(length-done, PAGE_SIZE);
1399 done += list[i].size;
1400 i++;
1401 }
1402 }
1403
1404 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1405 {
1406 HvLpEvent_Rc rc;
1407
1408 rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
1409 0, &cnx->pending_acks);
1410
1411 if (rc != HvLpEvent_Rc_Good)
1412 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1413 cnx->remote_lp, (int)rc);
1414
1415 cnx->num_pending_acks = 0;
1416 memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1417 }
1418
1419 static void veth_receive(struct veth_lpar_connection *cnx,
1420 struct veth_lpevent *event)
1421 {
1422 struct veth_frames_data *senddata = &event->u.frames_data;
1423 int startchunk = 0;
1424 int nchunks;
1425 unsigned long flags;
1426 HvLpDma_Rc rc;
1427
1428 do {
1429 u16 length = 0;
1430 struct sk_buff *skb;
1431 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1432 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1433 u64 dest;
1434 HvLpVirtualLanIndex vlan;
1435 struct net_device *dev;
1436 struct veth_port *port;
1437
1438 /* FIXME: do we need this? */
1439 memset(local_list, 0, sizeof(local_list));
1440 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1441
1442 /* a 0 address marks the end of the valid entries */
1443 if (senddata->addr[startchunk] == 0)
1444 break;
1445
1446 /* make sure that we have at least 1 EOF entry in the
1447 * remaining entries */
1448 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1449 veth_error("Missing EOF fragment in event "
1450 "eofmask = 0x%x startchunk = %d\n",
1451 (unsigned)senddata->eofmask,
1452 startchunk);
1453 break;
1454 }
1455
1456 /* build list of chunks in this frame */
1457 nchunks = 0;
1458 do {
1459 remote_list[nchunks].addr =
1460 (u64) senddata->addr[startchunk+nchunks] << 32;
1461 remote_list[nchunks].size =
1462 senddata->len[startchunk+nchunks];
1463 length += remote_list[nchunks].size;
1464 } while (! (senddata->eofmask &
1465 (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1466
1467 /* length == total length of all chunks */
1468 /* nchunks == # of chunks in this frame */
1469
1470 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1471 veth_error("Received oversize frame from LPAR %d "
1472 "(length = %d)\n",
1473 cnx->remote_lp, length);
1474 continue;
1475 }
1476
1477 skb = alloc_skb(length, GFP_ATOMIC);
1478 if (!skb)
1479 continue;
1480
1481 veth_build_dma_list(local_list, skb->data, length);
1482
1483 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1484 event->base_event.xSourceLp,
1485 HvLpDma_Direction_RemoteToLocal,
1486 cnx->src_inst,
1487 cnx->dst_inst,
1488 HvLpDma_AddressType_RealAddress,
1489 HvLpDma_AddressType_TceIndex,
1490 iseries_hv_addr(&local_list),
1491 iseries_hv_addr(&remote_list),
1492 length);
1493 if (rc != HvLpDma_Rc_Good) {
1494 dev_kfree_skb_irq(skb);
1495 continue;
1496 }
1497
1498 vlan = skb->data[9];
1499 dev = veth_dev[vlan];
1500 if (! dev) {
1501 /*
1502 * Some earlier versions of the driver sent
1503 * broadcasts down all connections, even to lpars
1504 * that weren't on the relevant vlan. So ignore
1505 * packets belonging to a vlan we're not on.
1506 * We can also be here if we receive packets while
1507 * the driver is going down, because then dev is NULL.
1508 */
1509 dev_kfree_skb_irq(skb);
1510 continue;
1511 }
1512
1513 port = netdev_priv(dev);
1514 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1515
1516 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1517 dev_kfree_skb_irq(skb);
1518 continue;
1519 }
1520 if (! veth_frame_wanted(port, dest)) {
1521 dev_kfree_skb_irq(skb);
1522 continue;
1523 }
1524
1525 skb_put(skb, length);
1526 skb->protocol = eth_type_trans(skb, dev);
1527 skb->ip_summed = CHECKSUM_NONE;
1528 netif_rx(skb); /* send it up */
1529 dev->stats.rx_packets++;
1530 dev->stats.rx_bytes += length;
1531 } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1532
1533 /* Ack it */
1534 spin_lock_irqsave(&cnx->lock, flags);
1535 BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1536
1537 cnx->pending_acks[cnx->num_pending_acks++] =
1538 event->base_event.xCorrelationToken;
1539
1540 if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold) ||
1541 (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1542 veth_flush_acks(cnx);
1543
1544 spin_unlock_irqrestore(&cnx->lock, flags);
1545 }
1546
1547 static void veth_timed_ack(unsigned long ptr)
1548 {
1549 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1550 unsigned long flags;
1551
1552 /* Ack all the events */
1553 spin_lock_irqsave(&cnx->lock, flags);
1554 if (cnx->num_pending_acks > 0)
1555 veth_flush_acks(cnx);
1556
1557 /* Reschedule the timer */
1558 cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1559 add_timer(&cnx->ack_timer);
1560 spin_unlock_irqrestore(&cnx->lock, flags);
1561 }
1562
1563 static int veth_remove(struct vio_dev *vdev)
1564 {
1565 struct veth_lpar_connection *cnx;
1566 struct net_device *dev;
1567 struct veth_port *port;
1568 int i;
1569
1570 dev = veth_dev[vdev->unit_address];
1571
1572 if (! dev)
1573 return 0;
1574
1575 port = netdev_priv(dev);
1576
1577 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1578 cnx = veth_cnx[i];
1579
1580 if (cnx && (port->lpar_map & (1 << i))) {
1581 /* Drop our reference to connections on our VLAN */
1582 kobject_put(&cnx->kobject);
1583 }
1584 }
1585
1586 veth_dev[vdev->unit_address] = NULL;
1587 kobject_del(&port->kobject);
1588 kobject_put(&port->kobject);
1589 unregister_netdev(dev);
1590 free_netdev(dev);
1591
1592 return 0;
1593 }
1594
1595 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1596 {
1597 int i = vdev->unit_address;
1598 struct net_device *dev;
1599 struct veth_port *port;
1600
1601 dev = veth_probe_one(i, vdev);
1602 if (dev == NULL) {
1603 veth_remove(vdev);
1604 return 1;
1605 }
1606 veth_dev[i] = dev;
1607
1608 port = (struct veth_port*)netdev_priv(dev);
1609
1610 /* Start the state machine on each connection on this vlan. If we're
1611 * the first dev to do so this will commence link negotiation */
1612 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1613 struct veth_lpar_connection *cnx;
1614
1615 if (! (port->lpar_map & (1 << i)))
1616 continue;
1617
1618 cnx = veth_cnx[i];
1619 if (!cnx)
1620 continue;
1621
1622 kobject_get(&cnx->kobject);
1623 veth_kick_statemachine(cnx);
1624 }
1625
1626 return 0;
1627 }
1628
1629 /**
1630 * veth_device_table: Used by vio.c to match devices that we
1631 * support.
1632 */
1633 static struct vio_device_id veth_device_table[] __devinitdata = {
1634 { "network", "IBM,iSeries-l-lan" },
1635 { "", "" }
1636 };
1637 MODULE_DEVICE_TABLE(vio, veth_device_table);
1638
1639 static struct vio_driver veth_driver = {
1640 .id_table = veth_device_table,
1641 .probe = veth_probe,
1642 .remove = veth_remove,
1643 .driver = {
1644 .name = DRV_NAME,
1645 .owner = THIS_MODULE,
1646 }
1647 };
1648
1649 /*
1650 * Module initialization/cleanup
1651 */
1652
1653 static void __exit veth_module_cleanup(void)
1654 {
1655 int i;
1656 struct veth_lpar_connection *cnx;
1657
1658 /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1659 HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1660
1661 /* Make sure any work queued from Hypervisor callbacks is finished. */
1662 flush_scheduled_work();
1663
1664 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1665 cnx = veth_cnx[i];
1666
1667 if (!cnx)
1668 continue;
1669
1670 /* Remove the connection from sysfs */
1671 kobject_del(&cnx->kobject);
1672 /* Drop the driver's reference to the connection */
1673 kobject_put(&cnx->kobject);
1674 }
1675
1676 /* Unregister the driver, which will close all the netdevs and stop
1677 * the connections when they're no longer referenced. */
1678 vio_unregister_driver(&veth_driver);
1679 }
1680 module_exit(veth_module_cleanup);
1681
1682 static int __init veth_module_init(void)
1683 {
1684 int i;
1685 int rc;
1686
1687 if (!firmware_has_feature(FW_FEATURE_ISERIES))
1688 return -ENODEV;
1689
1690 this_lp = HvLpConfig_getLpIndex_outline();
1691
1692 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1693 rc = veth_init_connection(i);
1694 if (rc != 0)
1695 goto error;
1696 }
1697
1698 HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1699 &veth_handle_event);
1700
1701 rc = vio_register_driver(&veth_driver);
1702 if (rc != 0)
1703 goto error;
1704
1705 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1706 struct kobject *kobj;
1707
1708 if (!veth_cnx[i])
1709 continue;
1710
1711 kobj = &veth_cnx[i]->kobject;
1712 /* If the add failes, complain but otherwise continue */
1713 if (0 != driver_add_kobj(&veth_driver.driver, kobj,
1714 "cnx%.2d", veth_cnx[i]->remote_lp))
1715 veth_error("cnx %d: Failed adding to sysfs.\n", i);
1716 }
1717
1718 return 0;
1719
1720 error:
1721 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1722 veth_destroy_connection(veth_cnx[i]);
1723 }
1724
1725 return rc;
1726 }
1727 module_init(veth_module_init);
Linux with added FPC-III support