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xircom_cb should return NETDEV_TX_BUSY when no descriptors available
[linux-2.6/linux-2.6-openrd.git] / drivers / net / iseries_veth.c
blob58d3bb622da6eabf5e7b5018c03fa83809019205
1 /* File veth.c created by Kyle A. Lucke on Mon Aug 7 2000. */
2 /*
3 * IBM eServer iSeries Virtual Ethernet Device Driver
4 * Copyright (C) 2001 Kyle A. Lucke (klucke@us.ibm.com), IBM Corp.
5 * Substantially cleaned up by:
6 * Copyright (C) 2003 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
7 * Copyright (C) 2004-2005 Michael Ellerman, IBM Corporation.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22 * USA
23 *
24 *
25 * This module implements the virtual ethernet device for iSeries LPAR
26 * Linux. It uses hypervisor message passing to implement an
27 * ethernet-like network device communicating between partitions on
28 * the iSeries.
29 *
30 * The iSeries LPAR hypervisor currently allows for up to 16 different
31 * virtual ethernets. These are all dynamically configurable on
32 * OS/400 partitions, but dynamic configuration is not supported under
33 * Linux yet. An ethXX network device will be created for each
34 * virtual ethernet this partition is connected to.
35 *
36 * - This driver is responsible for routing packets to and from other
37 * partitions. The MAC addresses used by the virtual ethernets
38 * contains meaning and must not be modified.
39 *
40 * - Having 2 virtual ethernets to the same remote partition DOES NOT
41 * double the available bandwidth. The 2 devices will share the
42 * available hypervisor bandwidth.
43 *
44 * - If you send a packet to your own mac address, it will just be
45 * dropped, you won't get it on the receive side.
46 *
47 * - Multicast is implemented by sending the frame frame to every
48 * other partition. It is the responsibility of the receiving
49 * partition to filter the addresses desired.
50 *
51 * Tunable parameters:
52 *
53 * VETH_NUMBUFFERS: This compile time option defaults to 120. It
54 * controls how much memory Linux will allocate per remote partition
55 * it is communicating with. It can be thought of as the maximum
56 * number of packets outstanding to a remote partition at a time.
57 */
58
59 #include <linux/module.h>
60 #include <linux/types.h>
61 #include <linux/errno.h>
62 #include <linux/ioport.h>
63 #include <linux/kernel.h>
64 #include <linux/netdevice.h>
65 #include <linux/etherdevice.h>
66 #include <linux/skbuff.h>
67 #include <linux/init.h>
68 #include <linux/delay.h>
69 #include <linux/mm.h>
70 #include <linux/ethtool.h>
71 #include <linux/if_ether.h>
72
73 #include <asm/abs_addr.h>
74 #include <asm/iseries/mf.h>
75 #include <asm/uaccess.h>
76 #include <asm/firmware.h>
77 #include <asm/iseries/hv_lp_config.h>
78 #include <asm/iseries/hv_types.h>
79 #include <asm/iseries/hv_lp_event.h>
80 #include <asm/iommu.h>
81 #include <asm/vio.h>
82
83 #undef DEBUG
84
85 MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
86 MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
87 MODULE_LICENSE("GPL");
88
89 #define VETH_EVENT_CAP (0)
90 #define VETH_EVENT_FRAMES (1)
91 #define VETH_EVENT_MONITOR (2)
92 #define VETH_EVENT_FRAMES_ACK (3)
93
94 #define VETH_MAX_ACKS_PER_MSG (20)
95 #define VETH_MAX_FRAMES_PER_MSG (6)
96
97 struct veth_frames_data {
98 u32 addr[VETH_MAX_FRAMES_PER_MSG];
99 u16 len[VETH_MAX_FRAMES_PER_MSG];
100 u32 eofmask;
101 };
102 #define VETH_EOF_SHIFT (32-VETH_MAX_FRAMES_PER_MSG)
103
104 struct veth_frames_ack_data {
105 u16 token[VETH_MAX_ACKS_PER_MSG];
106 };
107
108 struct veth_cap_data {
109 u8 caps_version;
110 u8 rsvd1;
111 u16 num_buffers;
112 u16 ack_threshold;
113 u16 rsvd2;
114 u32 ack_timeout;
115 u32 rsvd3;
116 u64 rsvd4[3];
117 };
118
119 struct veth_lpevent {
120 struct HvLpEvent base_event;
121 union {
122 struct veth_cap_data caps_data;
123 struct veth_frames_data frames_data;
124 struct veth_frames_ack_data frames_ack_data;
125 } u;
126
127 };
128
129 #define DRV_NAME "iseries_veth"
130 #define DRV_VERSION "2.0"
131
132 #define VETH_NUMBUFFERS (120)
133 #define VETH_ACKTIMEOUT (1000000) /* microseconds */
134 #define VETH_MAX_MCAST (12)
135
136 #define VETH_MAX_MTU (9000)
137
138 #if VETH_NUMBUFFERS < 10
139 #define ACK_THRESHOLD (1)
140 #elif VETH_NUMBUFFERS < 20
141 #define ACK_THRESHOLD (4)
142 #elif VETH_NUMBUFFERS < 40
143 #define ACK_THRESHOLD (10)
144 #else
145 #define ACK_THRESHOLD (20)
146 #endif
147
148 #define VETH_STATE_SHUTDOWN (0x0001)
149 #define VETH_STATE_OPEN (0x0002)
150 #define VETH_STATE_RESET (0x0004)
151 #define VETH_STATE_SENTMON (0x0008)
152 #define VETH_STATE_SENTCAPS (0x0010)
153 #define VETH_STATE_GOTCAPACK (0x0020)
154 #define VETH_STATE_GOTCAPS (0x0040)
155 #define VETH_STATE_SENTCAPACK (0x0080)
156 #define VETH_STATE_READY (0x0100)
157
158 struct veth_msg {
159 struct veth_msg *next;
160 struct veth_frames_data data;
161 int token;
162 int in_use;
163 struct sk_buff *skb;
164 struct device *dev;
165 };
166
167 struct veth_lpar_connection {
168 HvLpIndex remote_lp;
169 struct delayed_work statemachine_wq;
170 struct veth_msg *msgs;
171 int num_events;
172 struct veth_cap_data local_caps;
173
174 struct kobject kobject;
175 struct timer_list ack_timer;
176
177 struct timer_list reset_timer;
178 unsigned int reset_timeout;
179 unsigned long last_contact;
180 int outstanding_tx;
181
182 spinlock_t lock;
183 unsigned long state;
184 HvLpInstanceId src_inst;
185 HvLpInstanceId dst_inst;
186 struct veth_lpevent cap_event, cap_ack_event;
187 u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
188 u32 num_pending_acks;
189
190 int num_ack_events;
191 struct veth_cap_data remote_caps;
192 u32 ack_timeout;
193
194 struct veth_msg *msg_stack_head;
195 };
196
197 struct veth_port {
198 struct device *dev;
199 u64 mac_addr;
200 HvLpIndexMap lpar_map;
201
202 /* queue_lock protects the stopped_map and dev's queue. */
203 spinlock_t queue_lock;
204 HvLpIndexMap stopped_map;
205
206 /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
207 rwlock_t mcast_gate;
208 int promiscuous;
209 int num_mcast;
210 u64 mcast_addr[VETH_MAX_MCAST];
211
212 struct kobject kobject;
213 };
214
215 static HvLpIndex this_lp;
216 static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
217 static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
218
219 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
220 static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
221 static void veth_wake_queues(struct veth_lpar_connection *cnx);
222 static void veth_stop_queues(struct veth_lpar_connection *cnx);
223 static void veth_receive(struct veth_lpar_connection *, struct veth_lpevent *);
224 static void veth_release_connection(struct kobject *kobject);
225 static void veth_timed_ack(unsigned long ptr);
226 static void veth_timed_reset(unsigned long ptr);
227
228 /*
229 * Utility functions
230 */
231
232 #define veth_info(fmt, args...) \
233 printk(KERN_INFO DRV_NAME ": " fmt, ## args)
234
235 #define veth_error(fmt, args...) \
236 printk(KERN_ERR DRV_NAME ": Error: " fmt, ## args)
237
238 #ifdef DEBUG
239 #define veth_debug(fmt, args...) \
240 printk(KERN_DEBUG DRV_NAME ": " fmt, ## args)
241 #else
242 #define veth_debug(fmt, args...) do {} while (0)
243 #endif
244
245 /* You must hold the connection's lock when you call this function. */
246 static inline void veth_stack_push(struct veth_lpar_connection *cnx,
247 struct veth_msg *msg)
248 {
249 msg->next = cnx->msg_stack_head;
250 cnx->msg_stack_head = msg;
251 }
252
253 /* You must hold the connection's lock when you call this function. */
254 static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
255 {
256 struct veth_msg *msg;
257
258 msg = cnx->msg_stack_head;
259 if (msg)
260 cnx->msg_stack_head = cnx->msg_stack_head->next;
261
262 return msg;
263 }
264
265 /* You must hold the connection's lock when you call this function. */
266 static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
267 {
268 return cnx->msg_stack_head == NULL;
269 }
270
271 static inline HvLpEvent_Rc
272 veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
273 HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
274 u64 token,
275 u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
276 {
277 return HvCallEvent_signalLpEventFast(cnx->remote_lp,
278 HvLpEvent_Type_VirtualLan,
279 subtype, ackind, acktype,
280 cnx->src_inst,
281 cnx->dst_inst,
282 token, data1, data2, data3,
283 data4, data5);
284 }
285
286 static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
287 u16 subtype, u64 token, void *data)
288 {
289 u64 *p = (u64 *) data;
290
291 return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
292 HvLpEvent_AckType_ImmediateAck,
293 token, p[0], p[1], p[2], p[3], p[4]);
294 }
295
296 struct veth_allocation {
297 struct completion c;
298 int num;
299 };
300
301 static void veth_complete_allocation(void *parm, int number)
302 {
303 struct veth_allocation *vc = (struct veth_allocation *)parm;
304
305 vc->num = number;
306 complete(&vc->c);
307 }
308
309 static int veth_allocate_events(HvLpIndex rlp, int number)
310 {
311 struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
312
313 mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
314 sizeof(struct veth_lpevent), number,
315 &veth_complete_allocation, &vc);
316 wait_for_completion(&vc.c);
317
318 return vc.num;
319 }
320
321 /*
322 * sysfs support
323 */
324
325 struct veth_cnx_attribute {
326 struct attribute attr;
327 ssize_t (*show)(struct veth_lpar_connection *, char *buf);
328 ssize_t (*store)(struct veth_lpar_connection *, const char *buf);
329 };
330
331 static ssize_t veth_cnx_attribute_show(struct kobject *kobj,
332 struct attribute *attr, char *buf)
333 {
334 struct veth_cnx_attribute *cnx_attr;
335 struct veth_lpar_connection *cnx;
336
337 cnx_attr = container_of(attr, struct veth_cnx_attribute, attr);
338 cnx = container_of(kobj, struct veth_lpar_connection, kobject);
339
340 if (!cnx_attr->show)
341 return -EIO;
342
343 return cnx_attr->show(cnx, buf);
344 }
345
346 #define CUSTOM_CNX_ATTR(_name, _format, _expression) \
347 static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\
348 { \
349 return sprintf(buf, _format, _expression); \
350 } \
351 struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name)
352
353 #define SIMPLE_CNX_ATTR(_name) \
354 CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name)
355
356 SIMPLE_CNX_ATTR(outstanding_tx);
357 SIMPLE_CNX_ATTR(remote_lp);
358 SIMPLE_CNX_ATTR(num_events);
359 SIMPLE_CNX_ATTR(src_inst);
360 SIMPLE_CNX_ATTR(dst_inst);
361 SIMPLE_CNX_ATTR(num_pending_acks);
362 SIMPLE_CNX_ATTR(num_ack_events);
363 CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout));
364 CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout));
365 CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state);
366 CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ?
367 jiffies_to_msecs(jiffies - cnx->last_contact) : 0);
368
369 #define GET_CNX_ATTR(_name) (&veth_cnx_attr_##_name.attr)
370
371 static struct attribute *veth_cnx_default_attrs[] = {
372 GET_CNX_ATTR(outstanding_tx),
373 GET_CNX_ATTR(remote_lp),
374 GET_CNX_ATTR(num_events),
375 GET_CNX_ATTR(reset_timeout),
376 GET_CNX_ATTR(last_contact),
377 GET_CNX_ATTR(state),
378 GET_CNX_ATTR(src_inst),
379 GET_CNX_ATTR(dst_inst),
380 GET_CNX_ATTR(num_pending_acks),
381 GET_CNX_ATTR(num_ack_events),
382 GET_CNX_ATTR(ack_timeout),
383 NULL
384 };
385
386 static struct sysfs_ops veth_cnx_sysfs_ops = {
387 .show = veth_cnx_attribute_show
388 };
389
390 static struct kobj_type veth_lpar_connection_ktype = {
391 .release = veth_release_connection,
392 .sysfs_ops = &veth_cnx_sysfs_ops,
393 .default_attrs = veth_cnx_default_attrs
394 };
395
396 struct veth_port_attribute {
397 struct attribute attr;
398 ssize_t (*show)(struct veth_port *, char *buf);
399 ssize_t (*store)(struct veth_port *, const char *buf);
400 };
401
402 static ssize_t veth_port_attribute_show(struct kobject *kobj,
403 struct attribute *attr, char *buf)
404 {
405 struct veth_port_attribute *port_attr;
406 struct veth_port *port;
407
408 port_attr = container_of(attr, struct veth_port_attribute, attr);
409 port = container_of(kobj, struct veth_port, kobject);
410
411 if (!port_attr->show)
412 return -EIO;
413
414 return port_attr->show(port, buf);
415 }
416
417 #define CUSTOM_PORT_ATTR(_name, _format, _expression) \
418 static ssize_t _name##_show(struct veth_port *port, char *buf) \
419 { \
420 return sprintf(buf, _format, _expression); \
421 } \
422 struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name)
423
424 #define SIMPLE_PORT_ATTR(_name) \
425 CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name)
426
427 SIMPLE_PORT_ATTR(promiscuous);
428 SIMPLE_PORT_ATTR(num_mcast);
429 CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map);
430 CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map);
431 CUSTOM_PORT_ATTR(mac_addr, "0x%lX\n", port->mac_addr);
432
433 #define GET_PORT_ATTR(_name) (&veth_port_attr_##_name.attr)
434 static struct attribute *veth_port_default_attrs[] = {
435 GET_PORT_ATTR(mac_addr),
436 GET_PORT_ATTR(lpar_map),
437 GET_PORT_ATTR(stopped_map),
438 GET_PORT_ATTR(promiscuous),
439 GET_PORT_ATTR(num_mcast),
440 NULL
441 };
442
443 static struct sysfs_ops veth_port_sysfs_ops = {
444 .show = veth_port_attribute_show
445 };
446
447 static struct kobj_type veth_port_ktype = {
448 .sysfs_ops = &veth_port_sysfs_ops,
449 .default_attrs = veth_port_default_attrs
450 };
451
452 /*
453 * LPAR connection code
454 */
455
456 static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
457 {
458 schedule_delayed_work(&cnx->statemachine_wq, 0);
459 }
460
461 static void veth_take_cap(struct veth_lpar_connection *cnx,
462 struct veth_lpevent *event)
463 {
464 unsigned long flags;
465
466 spin_lock_irqsave(&cnx->lock, flags);
467 /* Receiving caps may mean the other end has just come up, so
468 * we need to reload the instance ID of the far end */
469 cnx->dst_inst =
470 HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
471 HvLpEvent_Type_VirtualLan);
472
473 if (cnx->state & VETH_STATE_GOTCAPS) {
474 veth_error("Received a second capabilities from LPAR %d.\n",
475 cnx->remote_lp);
476 event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
477 HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
478 } else {
479 memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
480 cnx->state |= VETH_STATE_GOTCAPS;
481 veth_kick_statemachine(cnx);
482 }
483 spin_unlock_irqrestore(&cnx->lock, flags);
484 }
485
486 static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
487 struct veth_lpevent *event)
488 {
489 unsigned long flags;
490
491 spin_lock_irqsave(&cnx->lock, flags);
492 if (cnx->state & VETH_STATE_GOTCAPACK) {
493 veth_error("Received a second capabilities ack from LPAR %d.\n",
494 cnx->remote_lp);
495 } else {
496 memcpy(&cnx->cap_ack_event, event,
497 sizeof(&cnx->cap_ack_event));
498 cnx->state |= VETH_STATE_GOTCAPACK;
499 veth_kick_statemachine(cnx);
500 }
501 spin_unlock_irqrestore(&cnx->lock, flags);
502 }
503
504 static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
505 struct veth_lpevent *event)
506 {
507 unsigned long flags;
508
509 spin_lock_irqsave(&cnx->lock, flags);
510 veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
511
512 /* Avoid kicking the statemachine once we're shutdown.
513 * It's unnecessary and it could break veth_stop_connection(). */
514
515 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
516 cnx->state |= VETH_STATE_RESET;
517 veth_kick_statemachine(cnx);
518 }
519 spin_unlock_irqrestore(&cnx->lock, flags);
520 }
521
522 static void veth_handle_ack(struct veth_lpevent *event)
523 {
524 HvLpIndex rlp = event->base_event.xTargetLp;
525 struct veth_lpar_connection *cnx = veth_cnx[rlp];
526
527 BUG_ON(! cnx);
528
529 switch (event->base_event.xSubtype) {
530 case VETH_EVENT_CAP:
531 veth_take_cap_ack(cnx, event);
532 break;
533 case VETH_EVENT_MONITOR:
534 veth_take_monitor_ack(cnx, event);
535 break;
536 default:
537 veth_error("Unknown ack type %d from LPAR %d.\n",
538 event->base_event.xSubtype, rlp);
539 };
540 }
541
542 static void veth_handle_int(struct veth_lpevent *event)
543 {
544 HvLpIndex rlp = event->base_event.xSourceLp;
545 struct veth_lpar_connection *cnx = veth_cnx[rlp];
546 unsigned long flags;
547 int i, acked = 0;
548
549 BUG_ON(! cnx);
550
551 switch (event->base_event.xSubtype) {
552 case VETH_EVENT_CAP:
553 veth_take_cap(cnx, event);
554 break;
555 case VETH_EVENT_MONITOR:
556 /* do nothing... this'll hang out here til we're dead,
557 * and the hypervisor will return it for us. */
558 break;
559 case VETH_EVENT_FRAMES_ACK:
560 spin_lock_irqsave(&cnx->lock, flags);
561
562 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
563 u16 msgnum = event->u.frames_ack_data.token[i];
564
565 if (msgnum < VETH_NUMBUFFERS) {
566 veth_recycle_msg(cnx, cnx->msgs + msgnum);
567 cnx->outstanding_tx--;
568 acked++;
569 }
570 }
571
572 if (acked > 0) {
573 cnx->last_contact = jiffies;
574 veth_wake_queues(cnx);
575 }
576
577 spin_unlock_irqrestore(&cnx->lock, flags);
578 break;
579 case VETH_EVENT_FRAMES:
580 veth_receive(cnx, event);
581 break;
582 default:
583 veth_error("Unknown interrupt type %d from LPAR %d.\n",
584 event->base_event.xSubtype, rlp);
585 };
586 }
587
588 static void veth_handle_event(struct HvLpEvent *event)
589 {
590 struct veth_lpevent *veth_event = (struct veth_lpevent *)event;
591
592 if (hvlpevent_is_ack(event))
593 veth_handle_ack(veth_event);
594 else
595 veth_handle_int(veth_event);
596 }
597
598 static int veth_process_caps(struct veth_lpar_connection *cnx)
599 {
600 struct veth_cap_data *remote_caps = &cnx->remote_caps;
601 int num_acks_needed;
602
603 /* Convert timer to jiffies */
604 cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
605
606 if ( (remote_caps->num_buffers == 0)
607 || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
608 || (remote_caps->ack_threshold == 0)
609 || (cnx->ack_timeout == 0) ) {
610 veth_error("Received incompatible capabilities from LPAR %d.\n",
611 cnx->remote_lp);
612 return HvLpEvent_Rc_InvalidSubtypeData;
613 }
614
615 num_acks_needed = (remote_caps->num_buffers
616 / remote_caps->ack_threshold) + 1;
617
618 /* FIXME: locking on num_ack_events? */
619 if (cnx->num_ack_events < num_acks_needed) {
620 int num;
621
622 num = veth_allocate_events(cnx->remote_lp,
623 num_acks_needed-cnx->num_ack_events);
624 if (num > 0)
625 cnx->num_ack_events += num;
626
627 if (cnx->num_ack_events < num_acks_needed) {
628 veth_error("Couldn't allocate enough ack events "
629 "for LPAR %d.\n", cnx->remote_lp);
630
631 return HvLpEvent_Rc_BufferNotAvailable;
632 }
633 }
634
635
636 return HvLpEvent_Rc_Good;
637 }
638
639 /* FIXME: The gotos here are a bit dubious */
640 static void veth_statemachine(struct work_struct *work)
641 {
642 struct veth_lpar_connection *cnx =
643 container_of(work, struct veth_lpar_connection,
644 statemachine_wq.work);
645 int rlp = cnx->remote_lp;
646 int rc;
647
648 spin_lock_irq(&cnx->lock);
649
650 restart:
651 if (cnx->state & VETH_STATE_RESET) {
652 if (cnx->state & VETH_STATE_OPEN)
653 HvCallEvent_closeLpEventPath(cnx->remote_lp,
654 HvLpEvent_Type_VirtualLan);
655
656 /*
657 * Reset ack data. This prevents the ack_timer actually
658 * doing anything, even if it runs one more time when
659 * we drop the lock below.
660 */
661 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
662 cnx->num_pending_acks = 0;
663
664 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
665 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
666 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
667 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
668
669 /* Clean up any leftover messages */
670 if (cnx->msgs) {
671 int i;
672 for (i = 0; i < VETH_NUMBUFFERS; ++i)
673 veth_recycle_msg(cnx, cnx->msgs + i);
674 }
675
676 cnx->outstanding_tx = 0;
677 veth_wake_queues(cnx);
678
679 /* Drop the lock so we can do stuff that might sleep or
680 * take other locks. */
681 spin_unlock_irq(&cnx->lock);
682
683 del_timer_sync(&cnx->ack_timer);
684 del_timer_sync(&cnx->reset_timer);
685
686 spin_lock_irq(&cnx->lock);
687
688 if (cnx->state & VETH_STATE_RESET)
689 goto restart;
690
691 /* Hack, wait for the other end to reset itself. */
692 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
693 schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
694 goto out;
695 }
696 }
697
698 if (cnx->state & VETH_STATE_SHUTDOWN)
699 /* It's all over, do nothing */
700 goto out;
701
702 if ( !(cnx->state & VETH_STATE_OPEN) ) {
703 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
704 goto cant_cope;
705
706 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
707 cnx->src_inst =
708 HvCallEvent_getSourceLpInstanceId(rlp,
709 HvLpEvent_Type_VirtualLan);
710 cnx->dst_inst =
711 HvCallEvent_getTargetLpInstanceId(rlp,
712 HvLpEvent_Type_VirtualLan);
713 cnx->state |= VETH_STATE_OPEN;
714 }
715
716 if ( (cnx->state & VETH_STATE_OPEN)
717 && !(cnx->state & VETH_STATE_SENTMON) ) {
718 rc = veth_signalevent(cnx, VETH_EVENT_MONITOR,
719 HvLpEvent_AckInd_DoAck,
720 HvLpEvent_AckType_DeferredAck,
721 0, 0, 0, 0, 0, 0);
722
723 if (rc == HvLpEvent_Rc_Good) {
724 cnx->state |= VETH_STATE_SENTMON;
725 } else {
726 if ( (rc != HvLpEvent_Rc_PartitionDead)
727 && (rc != HvLpEvent_Rc_PathClosed) )
728 veth_error("Error sending monitor to LPAR %d, "
729 "rc = %d\n", rlp, rc);
730
731 /* Oh well, hope we get a cap from the other
732 * end and do better when that kicks us */
733 goto out;
734 }
735 }
736
737 if ( (cnx->state & VETH_STATE_OPEN)
738 && !(cnx->state & VETH_STATE_SENTCAPS)) {
739 u64 *rawcap = (u64 *)&cnx->local_caps;
740
741 rc = veth_signalevent(cnx, VETH_EVENT_CAP,
742 HvLpEvent_AckInd_DoAck,
743 HvLpEvent_AckType_ImmediateAck,
744 0, rawcap[0], rawcap[1], rawcap[2],
745 rawcap[3], rawcap[4]);
746
747 if (rc == HvLpEvent_Rc_Good) {
748 cnx->state |= VETH_STATE_SENTCAPS;
749 } else {
750 if ( (rc != HvLpEvent_Rc_PartitionDead)
751 && (rc != HvLpEvent_Rc_PathClosed) )
752 veth_error("Error sending caps to LPAR %d, "
753 "rc = %d\n", rlp, rc);
754
755 /* Oh well, hope we get a cap from the other
756 * end and do better when that kicks us */
757 goto out;
758 }
759 }
760
761 if ((cnx->state & VETH_STATE_GOTCAPS)
762 && !(cnx->state & VETH_STATE_SENTCAPACK)) {
763 struct veth_cap_data *remote_caps = &cnx->remote_caps;
764
765 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
766 sizeof(*remote_caps));
767
768 spin_unlock_irq(&cnx->lock);
769 rc = veth_process_caps(cnx);
770 spin_lock_irq(&cnx->lock);
771
772 /* We dropped the lock, so recheck for anything which
773 * might mess us up */
774 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
775 goto restart;
776
777 cnx->cap_event.base_event.xRc = rc;
778 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
779 if (rc == HvLpEvent_Rc_Good)
780 cnx->state |= VETH_STATE_SENTCAPACK;
781 else
782 goto cant_cope;
783 }
784
785 if ((cnx->state & VETH_STATE_GOTCAPACK)
786 && (cnx->state & VETH_STATE_GOTCAPS)
787 && !(cnx->state & VETH_STATE_READY)) {
788 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
789 /* Start the ACK timer */
790 cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
791 add_timer(&cnx->ack_timer);
792 cnx->state |= VETH_STATE_READY;
793 } else {
794 veth_error("Caps rejected by LPAR %d, rc = %d\n",
795 rlp, cnx->cap_ack_event.base_event.xRc);
796 goto cant_cope;
797 }
798 }
799
800 out:
801 spin_unlock_irq(&cnx->lock);
802 return;
803
804 cant_cope:
805 /* FIXME: we get here if something happens we really can't
806 * cope with. The link will never work once we get here, and
807 * all we can do is not lock the rest of the system up */
808 veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
809 " (state = 0x%04lx)\n", rlp, cnx->state);
810 cnx->state |= VETH_STATE_SHUTDOWN;
811 spin_unlock_irq(&cnx->lock);
812 }
813
814 static int veth_init_connection(u8 rlp)
815 {
816 struct veth_lpar_connection *cnx;
817 struct veth_msg *msgs;
818 int i;
819
820 if ( (rlp == this_lp)
821 || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
822 return 0;
823
824 cnx = kzalloc(sizeof(*cnx), GFP_KERNEL);
825 if (! cnx)
826 return -ENOMEM;
827
828 cnx->remote_lp = rlp;
829 spin_lock_init(&cnx->lock);
830 INIT_DELAYED_WORK(&cnx->statemachine_wq, veth_statemachine);
831
832 init_timer(&cnx->ack_timer);
833 cnx->ack_timer.function = veth_timed_ack;
834 cnx->ack_timer.data = (unsigned long) cnx;
835
836 init_timer(&cnx->reset_timer);
837 cnx->reset_timer.function = veth_timed_reset;
838 cnx->reset_timer.data = (unsigned long) cnx;
839 cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
840
841 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
842
843 veth_cnx[rlp] = cnx;
844
845 /* This gets us 1 reference, which is held on behalf of the driver
846 * infrastructure. It's released at module unload. */
847 kobject_init(&cnx->kobject, &veth_lpar_connection_ktype);
848
849 msgs = kcalloc(VETH_NUMBUFFERS, sizeof(struct veth_msg), GFP_KERNEL);
850 if (! msgs) {
851 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
852 return -ENOMEM;
853 }
854
855 cnx->msgs = msgs;
856
857 for (i = 0; i < VETH_NUMBUFFERS; i++) {
858 msgs[i].token = i;
859 veth_stack_push(cnx, msgs + i);
860 }
861
862 cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
863
864 if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
865 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
866 return -ENOMEM;
867 }
868
869 cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
870 cnx->local_caps.ack_threshold = ACK_THRESHOLD;
871 cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
872
873 return 0;
874 }
875
876 static void veth_stop_connection(struct veth_lpar_connection *cnx)
877 {
878 if (!cnx)
879 return;
880
881 spin_lock_irq(&cnx->lock);
882 cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
883 veth_kick_statemachine(cnx);
884 spin_unlock_irq(&cnx->lock);
885
886 /* There's a slim chance the reset code has just queued the
887 * statemachine to run in five seconds. If so we need to cancel
888 * that and requeue the work to run now. */
889 if (cancel_delayed_work(&cnx->statemachine_wq)) {
890 spin_lock_irq(&cnx->lock);
891 veth_kick_statemachine(cnx);
892 spin_unlock_irq(&cnx->lock);
893 }
894
895 /* Wait for the state machine to run. */
896 flush_scheduled_work();
897 }
898
899 static void veth_destroy_connection(struct veth_lpar_connection *cnx)
900 {
901 if (!cnx)
902 return;
903
904 if (cnx->num_events > 0)
905 mf_deallocate_lp_events(cnx->remote_lp,
906 HvLpEvent_Type_VirtualLan,
907 cnx->num_events,
908 NULL, NULL);
909 if (cnx->num_ack_events > 0)
910 mf_deallocate_lp_events(cnx->remote_lp,
911 HvLpEvent_Type_VirtualLan,
912 cnx->num_ack_events,
913 NULL, NULL);
914
915 kfree(cnx->msgs);
916 veth_cnx[cnx->remote_lp] = NULL;
917 kfree(cnx);
918 }
919
920 static void veth_release_connection(struct kobject *kobj)
921 {
922 struct veth_lpar_connection *cnx;
923 cnx = container_of(kobj, struct veth_lpar_connection, kobject);
924 veth_stop_connection(cnx);
925 veth_destroy_connection(cnx);
926 }
927
928 /*
929 * net_device code
930 */
931
932 static int veth_open(struct net_device *dev)
933 {
934 netif_start_queue(dev);
935 return 0;
936 }
937
938 static int veth_close(struct net_device *dev)
939 {
940 netif_stop_queue(dev);
941 return 0;
942 }
943
944 static int veth_change_mtu(struct net_device *dev, int new_mtu)
945 {
946 if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
947 return -EINVAL;
948 dev->mtu = new_mtu;
949 return 0;
950 }
951
952 static void veth_set_multicast_list(struct net_device *dev)
953 {
954 struct veth_port *port = (struct veth_port *) dev->priv;
955 unsigned long flags;
956
957 write_lock_irqsave(&port->mcast_gate, flags);
958
959 if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
960 (dev->mc_count > VETH_MAX_MCAST)) {
961 port->promiscuous = 1;
962 } else {
963 struct dev_mc_list *dmi = dev->mc_list;
964 int i;
965
966 port->promiscuous = 0;
967
968 /* Update table */
969 port->num_mcast = 0;
970
971 for (i = 0; i < dev->mc_count; i++) {
972 u8 *addr = dmi->dmi_addr;
973 u64 xaddr = 0;
974
975 if (addr[0] & 0x01) {/* multicast address? */
976 memcpy(&xaddr, addr, ETH_ALEN);
977 port->mcast_addr[port->num_mcast] = xaddr;
978 port->num_mcast++;
979 }
980 dmi = dmi->next;
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 struct net_device *veth_probe_one(int vlan,
1024 struct vio_dev *vio_dev)
1025 {
1026 struct net_device *dev;
1027 struct veth_port *port;
1028 struct device *vdev = &vio_dev->dev;
1029 int i, rc;
1030 const unsigned char *mac_addr;
1031
1032 mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
1033 if (mac_addr == NULL)
1034 mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
1035 if (mac_addr == NULL) {
1036 veth_error("Unable to fetch MAC address from device tree.\n");
1037 return NULL;
1038 }
1039
1040 dev = alloc_etherdev(sizeof (struct veth_port));
1041 if (! dev) {
1042 veth_error("Unable to allocate net_device structure!\n");
1043 return NULL;
1044 }
1045
1046 port = (struct veth_port *) dev->priv;
1047
1048 spin_lock_init(&port->queue_lock);
1049 rwlock_init(&port->mcast_gate);
1050 port->stopped_map = 0;
1051
1052 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1053 HvLpVirtualLanIndexMap map;
1054
1055 if (i == this_lp)
1056 continue;
1057 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
1058 if (map & (0x8000 >> vlan))
1059 port->lpar_map |= (1 << i);
1060 }
1061 port->dev = vdev;
1062
1063 memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
1064
1065 dev->mtu = VETH_MAX_MTU;
1066
1067 memcpy(&port->mac_addr, mac_addr, ETH_ALEN);
1068
1069 dev->open = veth_open;
1070 dev->hard_start_xmit = veth_start_xmit;
1071 dev->stop = veth_close;
1072 dev->change_mtu = veth_change_mtu;
1073 dev->set_mac_address = NULL;
1074 dev->set_multicast_list = veth_set_multicast_list;
1075 SET_ETHTOOL_OPS(dev, &ops);
1076
1077 SET_NETDEV_DEV(dev, vdev);
1078
1079 rc = register_netdev(dev);
1080 if (rc != 0) {
1081 veth_error("Failed registering net device for vlan%d.\n", vlan);
1082 free_netdev(dev);
1083 return NULL;
1084 }
1085
1086 kobject_init(&port->kobject, &veth_port_ktype);
1087 if (0 != kobject_add(&port->kobject, &dev->dev.kobj, "veth_port"))
1088 veth_error("Failed adding port for %s to sysfs.\n", dev->name);
1089
1090 veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
1091 dev->name, vlan, port->lpar_map);
1092
1093 return dev;
1094 }
1095
1096 /*
1097 * Tx path
1098 */
1099
1100 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
1101 struct net_device *dev)
1102 {
1103 struct veth_lpar_connection *cnx = veth_cnx[rlp];
1104 struct veth_port *port = (struct veth_port *) dev->priv;
1105 HvLpEvent_Rc rc;
1106 struct veth_msg *msg = NULL;
1107 unsigned long flags;
1108
1109 if (! cnx)
1110 return 0;
1111
1112 spin_lock_irqsave(&cnx->lock, flags);
1113
1114 if (! (cnx->state & VETH_STATE_READY))
1115 goto no_error;
1116
1117 if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
1118 goto drop;
1119
1120 msg = veth_stack_pop(cnx);
1121 if (! msg)
1122 goto drop;
1123
1124 msg->in_use = 1;
1125 msg->skb = skb_get(skb);
1126
1127 msg->data.addr[0] = dma_map_single(port->dev, skb->data,
1128 skb->len, DMA_TO_DEVICE);
1129
1130 if (dma_mapping_error(msg->data.addr[0]))
1131 goto recycle_and_drop;
1132
1133 msg->dev = port->dev;
1134 msg->data.len[0] = skb->len;
1135 msg->data.eofmask = 1 << VETH_EOF_SHIFT;
1136
1137 rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
1138
1139 if (rc != HvLpEvent_Rc_Good)
1140 goto recycle_and_drop;
1141
1142 /* If the timer's not already running, start it now. */
1143 if (0 == cnx->outstanding_tx)
1144 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
1145
1146 cnx->last_contact = jiffies;
1147 cnx->outstanding_tx++;
1148
1149 if (veth_stack_is_empty(cnx))
1150 veth_stop_queues(cnx);
1151
1152 no_error:
1153 spin_unlock_irqrestore(&cnx->lock, flags);
1154 return 0;
1155
1156 recycle_and_drop:
1157 veth_recycle_msg(cnx, msg);
1158 drop:
1159 spin_unlock_irqrestore(&cnx->lock, flags);
1160 return 1;
1161 }
1162
1163 static void veth_transmit_to_many(struct sk_buff *skb,
1164 HvLpIndexMap lpmask,
1165 struct net_device *dev)
1166 {
1167 int i, success, error;
1168
1169 success = error = 0;
1170
1171 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1172 if ((lpmask & (1 << i)) == 0)
1173 continue;
1174
1175 if (veth_transmit_to_one(skb, i, dev))
1176 error = 1;
1177 else
1178 success = 1;
1179 }
1180
1181 if (error)
1182 dev->stats.tx_errors++;
1183
1184 if (success) {
1185 dev->stats.tx_packets++;
1186 dev->stats.tx_bytes += skb->len;
1187 }
1188 }
1189
1190 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1191 {
1192 unsigned char *frame = skb->data;
1193 struct veth_port *port = (struct veth_port *) dev->priv;
1194 HvLpIndexMap lpmask;
1195
1196 if (! (frame[0] & 0x01)) {
1197 /* unicast packet */
1198 HvLpIndex rlp = frame[5];
1199
1200 if ( ! ((1 << rlp) & port->lpar_map) ) {
1201 dev_kfree_skb(skb);
1202 return 0;
1203 }
1204
1205 lpmask = 1 << rlp;
1206 } else {
1207 lpmask = port->lpar_map;
1208 }
1209
1210 veth_transmit_to_many(skb, lpmask, dev);
1211
1212 dev_kfree_skb(skb);
1213
1214 return 0;
1215 }
1216
1217 /* You must hold the connection's lock when you call this function. */
1218 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1219 struct veth_msg *msg)
1220 {
1221 u32 dma_address, dma_length;
1222
1223 if (msg->in_use) {
1224 msg->in_use = 0;
1225 dma_address = msg->data.addr[0];
1226 dma_length = msg->data.len[0];
1227
1228 if (!dma_mapping_error(dma_address))
1229 dma_unmap_single(msg->dev, dma_address, dma_length,
1230 DMA_TO_DEVICE);
1231
1232 if (msg->skb) {
1233 dev_kfree_skb_any(msg->skb);
1234 msg->skb = NULL;
1235 }
1236
1237 memset(&msg->data, 0, sizeof(msg->data));
1238 veth_stack_push(cnx, msg);
1239 } else if (cnx->state & VETH_STATE_OPEN) {
1240 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1241 cnx->remote_lp, msg->token);
1242 }
1243 }
1244
1245 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1246 {
1247 int i;
1248
1249 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1250 struct net_device *dev = veth_dev[i];
1251 struct veth_port *port;
1252 unsigned long flags;
1253
1254 if (! dev)
1255 continue;
1256
1257 port = (struct veth_port *)dev->priv;
1258
1259 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1260 continue;
1261
1262 spin_lock_irqsave(&port->queue_lock, flags);
1263
1264 port->stopped_map &= ~(1 << cnx->remote_lp);
1265
1266 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1267 veth_debug("cnx %d: woke queue for %s.\n",
1268 cnx->remote_lp, dev->name);
1269 netif_wake_queue(dev);
1270 }
1271 spin_unlock_irqrestore(&port->queue_lock, flags);
1272 }
1273 }
1274
1275 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1276 {
1277 int i;
1278
1279 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1280 struct net_device *dev = veth_dev[i];
1281 struct veth_port *port;
1282
1283 if (! dev)
1284 continue;
1285
1286 port = (struct veth_port *)dev->priv;
1287
1288 /* If this cnx is not on the vlan for this port, continue */
1289 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1290 continue;
1291
1292 spin_lock(&port->queue_lock);
1293
1294 netif_stop_queue(dev);
1295 port->stopped_map |= (1 << cnx->remote_lp);
1296
1297 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1298 cnx->remote_lp, dev->name, port->stopped_map);
1299
1300 spin_unlock(&port->queue_lock);
1301 }
1302 }
1303
1304 static void veth_timed_reset(unsigned long ptr)
1305 {
1306 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1307 unsigned long trigger_time, flags;
1308
1309 /* FIXME is it possible this fires after veth_stop_connection()?
1310 * That would reschedule the statemachine for 5 seconds and probably
1311 * execute it after the module's been unloaded. Hmm. */
1312
1313 spin_lock_irqsave(&cnx->lock, flags);
1314
1315 if (cnx->outstanding_tx > 0) {
1316 trigger_time = cnx->last_contact + cnx->reset_timeout;
1317
1318 if (trigger_time < jiffies) {
1319 cnx->state |= VETH_STATE_RESET;
1320 veth_kick_statemachine(cnx);
1321 veth_error("%d packets not acked by LPAR %d within %d "
1322 "seconds, resetting.\n",
1323 cnx->outstanding_tx, cnx->remote_lp,
1324 cnx->reset_timeout / HZ);
1325 } else {
1326 /* Reschedule the timer */
1327 trigger_time = jiffies + cnx->reset_timeout;
1328 mod_timer(&cnx->reset_timer, trigger_time);
1329 }
1330 }
1331
1332 spin_unlock_irqrestore(&cnx->lock, flags);
1333 }
1334
1335 /*
1336 * Rx path
1337 */
1338
1339 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1340 {
1341 int wanted = 0;
1342 int i;
1343 unsigned long flags;
1344
1345 if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1346 return 1;
1347
1348 read_lock_irqsave(&port->mcast_gate, flags);
1349
1350 if (port->promiscuous) {
1351 wanted = 1;
1352 goto out;
1353 }
1354
1355 for (i = 0; i < port->num_mcast; ++i) {
1356 if (port->mcast_addr[i] == mac_addr) {
1357 wanted = 1;
1358 break;
1359 }
1360 }
1361
1362 out:
1363 read_unlock_irqrestore(&port->mcast_gate, flags);
1364
1365 return wanted;
1366 }
1367
1368 struct dma_chunk {
1369 u64 addr;
1370 u64 size;
1371 };
1372
1373 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1374
1375 static inline void veth_build_dma_list(struct dma_chunk *list,
1376 unsigned char *p, unsigned long length)
1377 {
1378 unsigned long done;
1379 int i = 1;
1380
1381 /* FIXME: skbs are continguous in real addresses. Do we
1382 * really need to break it into PAGE_SIZE chunks, or can we do
1383 * it just at the granularity of iSeries real->absolute
1384 * mapping? Indeed, given the way the allocator works, can we
1385 * count on them being absolutely contiguous? */
1386 list[0].addr = iseries_hv_addr(p);
1387 list[0].size = min(length,
1388 PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1389
1390 done = list[0].size;
1391 while (done < length) {
1392 list[i].addr = iseries_hv_addr(p + done);
1393 list[i].size = min(length-done, PAGE_SIZE);
1394 done += list[i].size;
1395 i++;
1396 }
1397 }
1398
1399 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1400 {
1401 HvLpEvent_Rc rc;
1402
1403 rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
1404 0, &cnx->pending_acks);
1405
1406 if (rc != HvLpEvent_Rc_Good)
1407 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1408 cnx->remote_lp, (int)rc);
1409
1410 cnx->num_pending_acks = 0;
1411 memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1412 }
1413
1414 static void veth_receive(struct veth_lpar_connection *cnx,
1415 struct veth_lpevent *event)
1416 {
1417 struct veth_frames_data *senddata = &event->u.frames_data;
1418 int startchunk = 0;
1419 int nchunks;
1420 unsigned long flags;
1421 HvLpDma_Rc rc;
1422
1423 do {
1424 u16 length = 0;
1425 struct sk_buff *skb;
1426 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1427 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1428 u64 dest;
1429 HvLpVirtualLanIndex vlan;
1430 struct net_device *dev;
1431 struct veth_port *port;
1432
1433 /* FIXME: do we need this? */
1434 memset(local_list, 0, sizeof(local_list));
1435 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1436
1437 /* a 0 address marks the end of the valid entries */
1438 if (senddata->addr[startchunk] == 0)
1439 break;
1440
1441 /* make sure that we have at least 1 EOF entry in the
1442 * remaining entries */
1443 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1444 veth_error("Missing EOF fragment in event "
1445 "eofmask = 0x%x startchunk = %d\n",
1446 (unsigned)senddata->eofmask,
1447 startchunk);
1448 break;
1449 }
1450
1451 /* build list of chunks in this frame */
1452 nchunks = 0;
1453 do {
1454 remote_list[nchunks].addr =
1455 (u64) senddata->addr[startchunk+nchunks] << 32;
1456 remote_list[nchunks].size =
1457 senddata->len[startchunk+nchunks];
1458 length += remote_list[nchunks].size;
1459 } while (! (senddata->eofmask &
1460 (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1461
1462 /* length == total length of all chunks */
1463 /* nchunks == # of chunks in this frame */
1464
1465 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1466 veth_error("Received oversize frame from LPAR %d "
1467 "(length = %d)\n",
1468 cnx->remote_lp, length);
1469 continue;
1470 }
1471
1472 skb = alloc_skb(length, GFP_ATOMIC);
1473 if (!skb)
1474 continue;
1475
1476 veth_build_dma_list(local_list, skb->data, length);
1477
1478 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1479 event->base_event.xSourceLp,
1480 HvLpDma_Direction_RemoteToLocal,
1481 cnx->src_inst,
1482 cnx->dst_inst,
1483 HvLpDma_AddressType_RealAddress,
1484 HvLpDma_AddressType_TceIndex,
1485 iseries_hv_addr(&local_list),
1486 iseries_hv_addr(&remote_list),
1487 length);
1488 if (rc != HvLpDma_Rc_Good) {
1489 dev_kfree_skb_irq(skb);
1490 continue;
1491 }
1492
1493 vlan = skb->data[9];
1494 dev = veth_dev[vlan];
1495 if (! dev) {
1496 /*
1497 * Some earlier versions of the driver sent
1498 * broadcasts down all connections, even to lpars
1499 * that weren't on the relevant vlan. So ignore
1500 * packets belonging to a vlan we're not on.
1501 * We can also be here if we receive packets while
1502 * the driver is going down, because then dev is NULL.
1503 */
1504 dev_kfree_skb_irq(skb);
1505 continue;
1506 }
1507
1508 port = (struct veth_port *)dev->priv;
1509 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1510
1511 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1512 dev_kfree_skb_irq(skb);
1513 continue;
1514 }
1515 if (! veth_frame_wanted(port, dest)) {
1516 dev_kfree_skb_irq(skb);
1517 continue;
1518 }
1519
1520 skb_put(skb, length);
1521 skb->protocol = eth_type_trans(skb, dev);
1522 skb->ip_summed = CHECKSUM_NONE;
1523 netif_rx(skb); /* send it up */
1524 dev->stats.rx_packets++;
1525 dev->stats.rx_bytes += length;
1526 } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1527
1528 /* Ack it */
1529 spin_lock_irqsave(&cnx->lock, flags);
1530 BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1531
1532 cnx->pending_acks[cnx->num_pending_acks++] =
1533 event->base_event.xCorrelationToken;
1534
1535 if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1536 || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1537 veth_flush_acks(cnx);
1538
1539 spin_unlock_irqrestore(&cnx->lock, flags);
1540 }
1541
1542 static void veth_timed_ack(unsigned long ptr)
1543 {
1544 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1545 unsigned long flags;
1546
1547 /* Ack all the events */
1548 spin_lock_irqsave(&cnx->lock, flags);
1549 if (cnx->num_pending_acks > 0)
1550 veth_flush_acks(cnx);
1551
1552 /* Reschedule the timer */
1553 cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1554 add_timer(&cnx->ack_timer);
1555 spin_unlock_irqrestore(&cnx->lock, flags);
1556 }
1557
1558 static int veth_remove(struct vio_dev *vdev)
1559 {
1560 struct veth_lpar_connection *cnx;
1561 struct net_device *dev;
1562 struct veth_port *port;
1563 int i;
1564
1565 dev = veth_dev[vdev->unit_address];
1566
1567 if (! dev)
1568 return 0;
1569
1570 port = netdev_priv(dev);
1571
1572 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1573 cnx = veth_cnx[i];
1574
1575 if (cnx && (port->lpar_map & (1 << i))) {
1576 /* Drop our reference to connections on our VLAN */
1577 kobject_put(&cnx->kobject);
1578 }
1579 }
1580
1581 veth_dev[vdev->unit_address] = NULL;
1582 kobject_del(&port->kobject);
1583 kobject_put(&port->kobject);
1584 unregister_netdev(dev);
1585 free_netdev(dev);
1586
1587 return 0;
1588 }
1589
1590 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1591 {
1592 int i = vdev->unit_address;
1593 struct net_device *dev;
1594 struct veth_port *port;
1595
1596 dev = veth_probe_one(i, vdev);
1597 if (dev == NULL) {
1598 veth_remove(vdev);
1599 return 1;
1600 }
1601 veth_dev[i] = dev;
1602
1603 port = (struct veth_port*)netdev_priv(dev);
1604
1605 /* Start the state machine on each connection on this vlan. If we're
1606 * the first dev to do so this will commence link negotiation */
1607 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1608 struct veth_lpar_connection *cnx;
1609
1610 if (! (port->lpar_map & (1 << i)))
1611 continue;
1612
1613 cnx = veth_cnx[i];
1614 if (!cnx)
1615 continue;
1616
1617 kobject_get(&cnx->kobject);
1618 veth_kick_statemachine(cnx);
1619 }
1620
1621 return 0;
1622 }
1623
1624 /**
1625 * veth_device_table: Used by vio.c to match devices that we
1626 * support.
1627 */
1628 static struct vio_device_id veth_device_table[] __devinitdata = {
1629 { "network", "IBM,iSeries-l-lan" },
1630 { "", "" }
1631 };
1632 MODULE_DEVICE_TABLE(vio, veth_device_table);
1633
1634 static struct vio_driver veth_driver = {
1635 .id_table = veth_device_table,
1636 .probe = veth_probe,
1637 .remove = veth_remove,
1638 .driver = {
1639 .name = DRV_NAME,
1640 .owner = THIS_MODULE,
1641 }
1642 };
1643
1644 /*
1645 * Module initialization/cleanup
1646 */
1647
1648 static void __exit veth_module_cleanup(void)
1649 {
1650 int i;
1651 struct veth_lpar_connection *cnx;
1652
1653 /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1654 HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1655
1656 /* Make sure any work queued from Hypervisor callbacks is finished. */
1657 flush_scheduled_work();
1658
1659 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1660 cnx = veth_cnx[i];
1661
1662 if (!cnx)
1663 continue;
1664
1665 /* Remove the connection from sysfs */
1666 kobject_del(&cnx->kobject);
1667 /* Drop the driver's reference to the connection */
1668 kobject_put(&cnx->kobject);
1669 }
1670
1671 /* Unregister the driver, which will close all the netdevs and stop
1672 * the connections when they're no longer referenced. */
1673 vio_unregister_driver(&veth_driver);
1674 }
1675 module_exit(veth_module_cleanup);
1676
1677 static int __init veth_module_init(void)
1678 {
1679 int i;
1680 int rc;
1681
1682 if (!firmware_has_feature(FW_FEATURE_ISERIES))
1683 return -ENODEV;
1684
1685 this_lp = HvLpConfig_getLpIndex_outline();
1686
1687 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1688 rc = veth_init_connection(i);
1689 if (rc != 0)
1690 goto error;
1691 }
1692
1693 HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1694 &veth_handle_event);
1695
1696 rc = vio_register_driver(&veth_driver);
1697 if (rc != 0)
1698 goto error;
1699
1700 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1701 struct kobject *kobj;
1702
1703 if (!veth_cnx[i])
1704 continue;
1705
1706 kobj = &veth_cnx[i]->kobject;
1707 /* If the add failes, complain but otherwise continue */
1708 if (0 != driver_add_kobj(&veth_driver.driver, kobj,
1709 "cnx%.2d", veth_cnx[i]->remote_lp))
1710 veth_error("cnx %d: Failed adding to sysfs.\n", i);
1711 }
1712
1713 return 0;
1714
1715 error:
1716 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1717 veth_destroy_connection(veth_cnx[i]);
1718 }
1719
1720 return rc;
1721 }
1722 module_init(veth_module_init);
linux 2.6 git repository for openrd