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[PATCH] iseries_veth: Use kobjects to track lifecycle of connection structs
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / iseries_veth.c
CommitLineData
1da177e4
LT		 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 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
22 *
23 *
24 * This module implements the virtual ethernet device for iSeries LPAR
25 * Linux. It uses hypervisor message passing to implement an
26 * ethernet-like network device communicating between partitions on
27 * the iSeries.
28 *
29 * The iSeries LPAR hypervisor currently allows for up to 16 different
30 * virtual ethernets. These are all dynamically configurable on
31 * OS/400 partitions, but dynamic configuration is not supported under
32 * Linux yet. An ethXX network device will be created for each
33 * virtual ethernet this partition is connected to.
34 *
35 * - This driver is responsible for routing packets to and from other
36 * partitions. The MAC addresses used by the virtual ethernets
37 * contains meaning and must not be modified.
38 *
39 * - Having 2 virtual ethernets to the same remote partition DOES NOT
40 * double the available bandwidth. The 2 devices will share the
41 * available hypervisor bandwidth.
42 *
43 * - If you send a packet to your own mac address, it will just be
44 * dropped, you won't get it on the receive side.
45 *
46 * - Multicast is implemented by sending the frame frame to every
47 * other partition. It is the responsibility of the receiving
48 * partition to filter the addresses desired.
49 *
50 * Tunable parameters:
51 *
52 * VETH_NUMBUFFERS: This compile time option defaults to 120. It
53 * controls how much memory Linux will allocate per remote partition
54 * it is communicating with. It can be thought of as the maximum
55 * number of packets outstanding to a remote partition at a time.
56 */
57
58#include <linux/config.h>
59#include <linux/module.h>
60#include <linux/version.h>
61#include <linux/types.h>
62#include <linux/errno.h>
63#include <linux/ioport.h>
64#include <linux/kernel.h>
65#include <linux/netdevice.h>
66#include <linux/etherdevice.h>
67#include <linux/skbuff.h>
68#include <linux/init.h>
69#include <linux/delay.h>
70#include <linux/mm.h>
71#include <linux/ethtool.h>
72#include <asm/iSeries/mf.h>
73#include <asm/iSeries/iSeries_pci.h>
74#include <asm/uaccess.h>
75
76#include <asm/iSeries/HvLpConfig.h>
77#include <asm/iSeries/HvTypes.h>
78#include <asm/iSeries/HvLpEvent.h>
79#include <asm/iommu.h>
80#include <asm/vio.h>
81
61a3c696
ME		 82#undef DEBUG
83
1da177e4
LT		 84#include "iseries_veth.h"
85
86MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
87MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
88MODULE_LICENSE("GPL");
89
90#define VETH_NUMBUFFERS (120)
91#define VETH_ACKTIMEOUT (1000000) /* microseconds */
92#define VETH_MAX_MCAST (12)
93
94#define VETH_MAX_MTU (9000)
95
96#if VETH_NUMBUFFERS < 10
97#define ACK_THRESHOLD (1)
98#elif VETH_NUMBUFFERS < 20
99#define ACK_THRESHOLD (4)
100#elif VETH_NUMBUFFERS < 40
101#define ACK_THRESHOLD (10)
102#else
103#define ACK_THRESHOLD (20)
104#endif
105
106#define VETH_STATE_SHUTDOWN (0x0001)
107#define VETH_STATE_OPEN (0x0002)
108#define VETH_STATE_RESET (0x0004)
109#define VETH_STATE_SENTMON (0x0008)
110#define VETH_STATE_SENTCAPS (0x0010)
111#define VETH_STATE_GOTCAPACK (0x0020)
112#define VETH_STATE_GOTCAPS (0x0040)
113#define VETH_STATE_SENTCAPACK (0x0080)
114#define VETH_STATE_READY (0x0100)
115
116struct veth_msg {
117 struct veth_msg *next;
118 struct VethFramesData data;
119 int token;
b08bd5c0 120 int in_use;
1da177e4
LT		 121 struct sk_buff *skb;
122 struct device *dev;
123};
124
125struct veth_lpar_connection {
126 HvLpIndex remote_lp;
127 struct work_struct statemachine_wq;
128 struct veth_msg *msgs;
129 int num_events;
130 struct VethCapData local_caps;
131
f0c129ca 132 struct kobject kobject;
1da177e4
LT		 133 struct timer_list ack_timer;
134
135 spinlock_t lock;
136 unsigned long state;
137 HvLpInstanceId src_inst;
138 HvLpInstanceId dst_inst;
139 struct VethLpEvent cap_event, cap_ack_event;
140 u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
141 u32 num_pending_acks;
142
143 int num_ack_events;
144 struct VethCapData remote_caps;
145 u32 ack_timeout;
146
1da177e4
LT		 147 struct veth_msg *msg_stack_head;
148};
149
150struct veth_port {
151 struct device *dev;
152 struct net_device_stats stats;
153 u64 mac_addr;
154 HvLpIndexMap lpar_map;
155
156 spinlock_t pending_gate;
157 struct sk_buff *pending_skb;
158 HvLpIndexMap pending_lpmask;
159
160 rwlock_t mcast_gate;
161 int promiscuous;
1da177e4
LT		 162 int num_mcast;
163 u64 mcast_addr[VETH_MAX_MCAST];
164};
165
166static HvLpIndex this_lp;
167static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
168static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
169
170static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
171static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
172static void veth_flush_pending(struct veth_lpar_connection *cnx);
173static void veth_receive(struct veth_lpar_connection *, struct VethLpEvent *);
174static void veth_timed_ack(unsigned long connectionPtr);
f0c129ca
ME		 175static void veth_release_connection(struct kobject *kobject);
176
177static struct kobj_type veth_lpar_connection_ktype = {
178 .release = veth_release_connection
179};
1da177e4
LT		 180
181/*
182 * Utility functions
183 */
184
61a3c696
ME		 185#define veth_info(fmt, args...) \
186 printk(KERN_INFO "iseries_veth: " fmt, ## args)
1da177e4
LT		 187
188#define veth_error(fmt, args...) \
61a3c696
ME		 189 printk(KERN_ERR "iseries_veth: Error: " fmt, ## args)
190
191#ifdef DEBUG
192#define veth_debug(fmt, args...) \
193 printk(KERN_DEBUG "iseries_veth: " fmt, ## args)
194#else
195#define veth_debug(fmt, args...) do {} while (0)
196#endif
1da177e4 197
d7893ddd 198/* You must hold the connection's lock when you call this function. */
1da177e4
LT		 199static inline void veth_stack_push(struct veth_lpar_connection *cnx,
200 struct veth_msg *msg)
201{
1da177e4
LT		 202 msg->next = cnx->msg_stack_head;
203 cnx->msg_stack_head = msg;
1da177e4
LT		 204}
205
d7893ddd 206/* You must hold the connection's lock when you call this function. */
1da177e4
LT		 207static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
208{
1da177e4
LT		 209 struct veth_msg *msg;
210
1da177e4
LT		 211 msg = cnx->msg_stack_head;
212 if (msg)
213 cnx->msg_stack_head = cnx->msg_stack_head->next;
d7893ddd 214
1da177e4
LT		 215 return msg;
216}
217
218static inline HvLpEvent_Rc
219veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
220 HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
221 u64 token,
222 u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
223{
224 return HvCallEvent_signalLpEventFast(cnx->remote_lp,
225 HvLpEvent_Type_VirtualLan,
226 subtype, ackind, acktype,
227 cnx->src_inst,
228 cnx->dst_inst,
229 token, data1, data2, data3,
230 data4, data5);
231}
232
233static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
234 u16 subtype, u64 token, void *data)
235{
236 u64 *p = (u64 *) data;
237
238 return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
239 HvLpEvent_AckType_ImmediateAck,
240 token, p[0], p[1], p[2], p[3], p[4]);
241}
242
243struct veth_allocation {
244 struct completion c;
245 int num;
246};
247
248static void veth_complete_allocation(void *parm, int number)
249{
250 struct veth_allocation *vc = (struct veth_allocation *)parm;
251
252 vc->num = number;
253 complete(&vc->c);
254}
255
256static int veth_allocate_events(HvLpIndex rlp, int number)
257{
258 struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
259
260 mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
261 sizeof(struct VethLpEvent), number,
262 &veth_complete_allocation, &vc);
263 wait_for_completion(&vc.c);
264
265 return vc.num;
266}
267
268/*
269 * LPAR connection code
270 */
271
272static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
273{
274 schedule_work(&cnx->statemachine_wq);
275}
276
277static void veth_take_cap(struct veth_lpar_connection *cnx,
278 struct VethLpEvent *event)
279{
280 unsigned long flags;
281
282 spin_lock_irqsave(&cnx->lock, flags);
283 /* Receiving caps may mean the other end has just come up, so
284 * we need to reload the instance ID of the far end */
285 cnx->dst_inst =
286 HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
287 HvLpEvent_Type_VirtualLan);
288
289 if (cnx->state & VETH_STATE_GOTCAPS) {
61a3c696 290 veth_error("Received a second capabilities from LPAR %d.\n",
1da177e4
LT		 291 cnx->remote_lp);
292 event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
293 HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
294 } else {
295 memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
296 cnx->state |= VETH_STATE_GOTCAPS;
297 veth_kick_statemachine(cnx);
298 }
299 spin_unlock_irqrestore(&cnx->lock, flags);
300}
301
302static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
303 struct VethLpEvent *event)
304{
305 unsigned long flags;
306
307 spin_lock_irqsave(&cnx->lock, flags);
308 if (cnx->state & VETH_STATE_GOTCAPACK) {
61a3c696 309 veth_error("Received a second capabilities ack from LPAR %d.\n",
1da177e4
LT		 310 cnx->remote_lp);
311 } else {
312 memcpy(&cnx->cap_ack_event, event,
313 sizeof(&cnx->cap_ack_event));
314 cnx->state |= VETH_STATE_GOTCAPACK;
315 veth_kick_statemachine(cnx);
316 }
317 spin_unlock_irqrestore(&cnx->lock, flags);
318}
319
320static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
321 struct VethLpEvent *event)
322{
323 unsigned long flags;
324
325 spin_lock_irqsave(&cnx->lock, flags);
61a3c696 326 veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
58c5900b
ME		 327
328 /* Avoid kicking the statemachine once we're shutdown.
329 * It's unnecessary and it could break veth_stop_connection(). */
330
331 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
332 cnx->state |= VETH_STATE_RESET;
333 veth_kick_statemachine(cnx);
334 }
1da177e4
LT		 335 spin_unlock_irqrestore(&cnx->lock, flags);
336}
337
338static void veth_handle_ack(struct VethLpEvent *event)
339{
340 HvLpIndex rlp = event->base_event.xTargetLp;
341 struct veth_lpar_connection *cnx = veth_cnx[rlp];
342
343 BUG_ON(! cnx);
344
345 switch (event->base_event.xSubtype) {
346 case VethEventTypeCap:
347 veth_take_cap_ack(cnx, event);
348 break;
349 case VethEventTypeMonitor:
350 veth_take_monitor_ack(cnx, event);
351 break;
352 default:
61a3c696
ME		 353 veth_error("Unknown ack type %d from LPAR %d.\n",
354 event->base_event.xSubtype, rlp);
1da177e4
LT		 355 };
356}
357
358static void veth_handle_int(struct VethLpEvent *event)
359{
360 HvLpIndex rlp = event->base_event.xSourceLp;
361 struct veth_lpar_connection *cnx = veth_cnx[rlp];
362 unsigned long flags;
363 int i;
364
365 BUG_ON(! cnx);
366
367 switch (event->base_event.xSubtype) {
368 case VethEventTypeCap:
369 veth_take_cap(cnx, event);
370 break;
371 case VethEventTypeMonitor:
372 /* do nothing... this'll hang out here til we're dead,
373 * and the hypervisor will return it for us. */
374 break;
375 case VethEventTypeFramesAck:
376 spin_lock_irqsave(&cnx->lock, flags);
377 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
378 u16 msgnum = event->u.frames_ack_data.token[i];
379
380 if (msgnum < VETH_NUMBUFFERS)
381 veth_recycle_msg(cnx, cnx->msgs + msgnum);
382 }
383 spin_unlock_irqrestore(&cnx->lock, flags);
384 veth_flush_pending(cnx);
385 break;
386 case VethEventTypeFrames:
387 veth_receive(cnx, event);
388 break;
389 default:
61a3c696
ME		 390 veth_error("Unknown interrupt type %d from LPAR %d.\n",
391 event->base_event.xSubtype, rlp);
1da177e4
LT		 392 };
393}
394
395static void veth_handle_event(struct HvLpEvent *event, struct pt_regs *regs)
396{
397 struct VethLpEvent *veth_event = (struct VethLpEvent *)event;
398
399 if (event->xFlags.xFunction == HvLpEvent_Function_Ack)
400 veth_handle_ack(veth_event);
401 else if (event->xFlags.xFunction == HvLpEvent_Function_Int)
402 veth_handle_int(veth_event);
403}
404
405static int veth_process_caps(struct veth_lpar_connection *cnx)
406{
407 struct VethCapData *remote_caps = &cnx->remote_caps;
408 int num_acks_needed;
409
410 /* Convert timer to jiffies */
411 cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
412
413 if ( (remote_caps->num_buffers == 0)
414 || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
415 || (remote_caps->ack_threshold == 0)
416 || (cnx->ack_timeout == 0) ) {
61a3c696
ME		 417 veth_error("Received incompatible capabilities from LPAR %d.\n",
418 cnx->remote_lp);
1da177e4
LT		 419 return HvLpEvent_Rc_InvalidSubtypeData;
420 }
421
422 num_acks_needed = (remote_caps->num_buffers
423 / remote_caps->ack_threshold) + 1;
424
425 /* FIXME: locking on num_ack_events? */
426 if (cnx->num_ack_events < num_acks_needed) {
427 int num;
428
429 num = veth_allocate_events(cnx->remote_lp,
430 num_acks_needed-cnx->num_ack_events);
431 if (num > 0)
432 cnx->num_ack_events += num;
433
434 if (cnx->num_ack_events < num_acks_needed) {
61a3c696
ME		 435 veth_error("Couldn't allocate enough ack events "
436 "for LPAR %d.\n", cnx->remote_lp);
1da177e4
LT		 437
438 return HvLpEvent_Rc_BufferNotAvailable;
439 }
440 }
441
442
443 return HvLpEvent_Rc_Good;
444}
445
446/* FIXME: The gotos here are a bit dubious */
447static void veth_statemachine(void *p)
448{
449 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)p;
450 int rlp = cnx->remote_lp;
451 int rc;
452
453 spin_lock_irq(&cnx->lock);
454
455 restart:
456 if (cnx->state & VETH_STATE_RESET) {
457 int i;
458
1da177e4
LT		 459 if (cnx->state & VETH_STATE_OPEN)
460 HvCallEvent_closeLpEventPath(cnx->remote_lp,
461 HvLpEvent_Type_VirtualLan);
462
abfda471
ME		 463 /*
464 * Reset ack data. This prevents the ack_timer actually
465 * doing anything, even if it runs one more time when
466 * we drop the lock below.
467 */
1da177e4
LT		 468 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
469 cnx->num_pending_acks = 0;
470
471 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
472 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
473 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
474 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
475
476 /* Clean up any leftover messages */
477 if (cnx->msgs)
478 for (i = 0; i < VETH_NUMBUFFERS; ++i)
479 veth_recycle_msg(cnx, cnx->msgs + i);
abfda471
ME		 480
481 /* Drop the lock so we can do stuff that might sleep or
482 * take other locks. */
1da177e4 483 spin_unlock_irq(&cnx->lock);
abfda471
ME		 484
485 del_timer_sync(&cnx->ack_timer);
1da177e4 486 veth_flush_pending(cnx);
abfda471 487
1da177e4 488 spin_lock_irq(&cnx->lock);
abfda471 489
1da177e4
LT		 490 if (cnx->state & VETH_STATE_RESET)
491 goto restart;
58c5900b
ME		 492
493 /* Hack, wait for the other end to reset itself. */
494 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
495 schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
496 goto out;
497 }
1da177e4
LT		 498 }
499
500 if (cnx->state & VETH_STATE_SHUTDOWN)
501 /* It's all over, do nothing */
502 goto out;
503
504 if ( !(cnx->state & VETH_STATE_OPEN) ) {
505 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
506 goto cant_cope;
507
508 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
509 cnx->src_inst =
510 HvCallEvent_getSourceLpInstanceId(rlp,
511 HvLpEvent_Type_VirtualLan);
512 cnx->dst_inst =
513 HvCallEvent_getTargetLpInstanceId(rlp,
514 HvLpEvent_Type_VirtualLan);
515 cnx->state |= VETH_STATE_OPEN;
516 }
517
518 if ( (cnx->state & VETH_STATE_OPEN)
519 && !(cnx->state & VETH_STATE_SENTMON) ) {
520 rc = veth_signalevent(cnx, VethEventTypeMonitor,
521 HvLpEvent_AckInd_DoAck,
522 HvLpEvent_AckType_DeferredAck,
523 0, 0, 0, 0, 0, 0);
524
525 if (rc == HvLpEvent_Rc_Good) {
526 cnx->state |= VETH_STATE_SENTMON;
527 } else {
528 if ( (rc != HvLpEvent_Rc_PartitionDead)
529 && (rc != HvLpEvent_Rc_PathClosed) )
61a3c696
ME		 530 veth_error("Error sending monitor to LPAR %d, "
531 "rc = %d\n", rlp, rc);
1da177e4
LT		 532
533 /* Oh well, hope we get a cap from the other
534 * end and do better when that kicks us */
535 goto out;
536 }
537 }
538
539 if ( (cnx->state & VETH_STATE_OPEN)
540 && !(cnx->state & VETH_STATE_SENTCAPS)) {
541 u64 *rawcap = (u64 *)&cnx->local_caps;
542
543 rc = veth_signalevent(cnx, VethEventTypeCap,
544 HvLpEvent_AckInd_DoAck,
545 HvLpEvent_AckType_ImmediateAck,
546 0, rawcap[0], rawcap[1], rawcap[2],
547 rawcap[3], rawcap[4]);
548
549 if (rc == HvLpEvent_Rc_Good) {
550 cnx->state |= VETH_STATE_SENTCAPS;
551 } else {
552 if ( (rc != HvLpEvent_Rc_PartitionDead)
553 && (rc != HvLpEvent_Rc_PathClosed) )
61a3c696
ME		 554 veth_error("Error sending caps to LPAR %d, "
555 "rc = %d\n", rlp, rc);
556
1da177e4
LT		 557 /* Oh well, hope we get a cap from the other
558 * end and do better when that kicks us */
559 goto out;
560 }
561 }
562
563 if ((cnx->state & VETH_STATE_GOTCAPS)
564 && !(cnx->state & VETH_STATE_SENTCAPACK)) {
565 struct VethCapData *remote_caps = &cnx->remote_caps;
566
567 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
568 sizeof(*remote_caps));
569
570 spin_unlock_irq(&cnx->lock);
571 rc = veth_process_caps(cnx);
572 spin_lock_irq(&cnx->lock);
573
574 /* We dropped the lock, so recheck for anything which
575 * might mess us up */
576 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
577 goto restart;
578
579 cnx->cap_event.base_event.xRc = rc;
580 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
581 if (rc == HvLpEvent_Rc_Good)
582 cnx->state |= VETH_STATE_SENTCAPACK;
583 else
584 goto cant_cope;
585 }
586
587 if ((cnx->state & VETH_STATE_GOTCAPACK)
588 && (cnx->state & VETH_STATE_GOTCAPS)
589 && !(cnx->state & VETH_STATE_READY)) {
590 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
591 /* Start the ACK timer */
592 cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
593 add_timer(&cnx->ack_timer);
594 cnx->state |= VETH_STATE_READY;
595 } else {
61a3c696
ME		 596 veth_error("Caps rejected by LPAR %d, rc = %d\n",
597 rlp, cnx->cap_ack_event.base_event.xRc);
1da177e4
LT		 598 goto cant_cope;
599 }
600 }
601
602 out:
603 spin_unlock_irq(&cnx->lock);
604 return;
605
606 cant_cope:
607 /* FIXME: we get here if something happens we really can't
608 * cope with. The link will never work once we get here, and
609 * all we can do is not lock the rest of the system up */
61a3c696
ME		 610 veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
611 " (state = 0x%04lx)\n", rlp, cnx->state);
1da177e4
LT		 612 cnx->state |= VETH_STATE_SHUTDOWN;
613 spin_unlock_irq(&cnx->lock);
614}
615
616static int veth_init_connection(u8 rlp)
617{
618 struct veth_lpar_connection *cnx;
619 struct veth_msg *msgs;
f0c129ca 620 int i, rc;
1da177e4
LT		 621
622 if ( (rlp == this_lp)
623 || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
624 return 0;
625
626 cnx = kmalloc(sizeof(*cnx), GFP_KERNEL);
627 if (! cnx)
628 return -ENOMEM;
629 memset(cnx, 0, sizeof(*cnx));
630
631 cnx->remote_lp = rlp;
632 spin_lock_init(&cnx->lock);
633 INIT_WORK(&cnx->statemachine_wq, veth_statemachine, cnx);
634 init_timer(&cnx->ack_timer);
635 cnx->ack_timer.function = veth_timed_ack;
636 cnx->ack_timer.data = (unsigned long) cnx;
637 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
638
639 veth_cnx[rlp] = cnx;
640
f0c129ca
ME		 641 /* This gets us 1 reference, which is held on behalf of the driver
642 * infrastructure. It's released at module unload. */
643 kobject_init(&cnx->kobject);
644 cnx->kobject.ktype = &veth_lpar_connection_ktype;
645 rc = kobject_set_name(&cnx->kobject, "cnx%.2d", rlp);
646 if (rc != 0)
647 return rc;
648
1da177e4
LT		 649 msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL);
650 if (! msgs) {
61a3c696 651 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
1da177e4
LT		 652 return -ENOMEM;
653 }
654
655 cnx->msgs = msgs;
656 memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg));
1da177e4
LT		 657
658 for (i = 0; i < VETH_NUMBUFFERS; i++) {
659 msgs[i].token = i;
660 veth_stack_push(cnx, msgs + i);
661 }
662
663 cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
664
665 if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
61a3c696 666 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
1da177e4
LT		 667 return -ENOMEM;
668 }
669
670 cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
671 cnx->local_caps.ack_threshold = ACK_THRESHOLD;
672 cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
673
674 return 0;
675}
676
f0c129ca 677static void veth_stop_connection(struct veth_lpar_connection *cnx)
1da177e4 678{
f0c129ca 679 if (!cnx)
1da177e4
LT		 680 return;
681
682 spin_lock_irq(&cnx->lock);
683 cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
684 veth_kick_statemachine(cnx);
685 spin_unlock_irq(&cnx->lock);
686
58c5900b
ME		 687 /* There's a slim chance the reset code has just queued the
688 * statemachine to run in five seconds. If so we need to cancel
689 * that and requeue the work to run now. */
690 if (cancel_delayed_work(&cnx->statemachine_wq)) {
691 spin_lock_irq(&cnx->lock);
692 veth_kick_statemachine(cnx);
693 spin_unlock_irq(&cnx->lock);
694 }
695
abfda471 696 /* Wait for the state machine to run. */
1da177e4 697 flush_scheduled_work();
ec60beeb
ME		 698}
699
f0c129ca 700static void veth_destroy_connection(struct veth_lpar_connection *cnx)
ec60beeb 701{
f0c129ca 702 if (!cnx)
ec60beeb 703 return;
1da177e4 704
1da177e4
LT		 705 if (cnx->num_events > 0)
706 mf_deallocate_lp_events(cnx->remote_lp,
707 HvLpEvent_Type_VirtualLan,
708 cnx->num_events,
709 NULL, NULL);
710 if (cnx->num_ack_events > 0)
711 mf_deallocate_lp_events(cnx->remote_lp,
712 HvLpEvent_Type_VirtualLan,
713 cnx->num_ack_events,
714 NULL, NULL);
1da177e4
LT		 715
716 kfree(cnx->msgs);
f0c129ca 717 veth_cnx[cnx->remote_lp] = NULL;
1da177e4 718 kfree(cnx);
f0c129ca
ME		 719}
720
721static void veth_release_connection(struct kobject *kobj)
722{
723 struct veth_lpar_connection *cnx;
724 cnx = container_of(kobj, struct veth_lpar_connection, kobject);
725 veth_stop_connection(cnx);
726 veth_destroy_connection(cnx);
1da177e4
LT		 727}
728
729/*
730 * net_device code
731 */
732
733static int veth_open(struct net_device *dev)
734{
735 struct veth_port *port = (struct veth_port *) dev->priv;
736
737 memset(&port->stats, 0, sizeof (port->stats));
738 netif_start_queue(dev);
739 return 0;
740}
741
742static int veth_close(struct net_device *dev)
743{
744 netif_stop_queue(dev);
745 return 0;
746}
747
748static struct net_device_stats *veth_get_stats(struct net_device *dev)
749{
750 struct veth_port *port = (struct veth_port *) dev->priv;
751
752 return &port->stats;
753}
754
755static int veth_change_mtu(struct net_device *dev, int new_mtu)
756{
757 if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
758 return -EINVAL;
759 dev->mtu = new_mtu;
760 return 0;
761}
762
763static void veth_set_multicast_list(struct net_device *dev)
764{
765 struct veth_port *port = (struct veth_port *) dev->priv;
766 unsigned long flags;
767
768 write_lock_irqsave(&port->mcast_gate, flags);
769
2a5391a1
ME		 770 if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
771 (dev->mc_count > VETH_MAX_MCAST)) {
1da177e4 772 port->promiscuous = 1;
1da177e4
LT		 773 } else {
774 struct dev_mc_list *dmi = dev->mc_list;
775 int i;
776
2a5391a1
ME		 777 port->promiscuous = 0;
778
1da177e4
LT		 779 /* Update table */
780 port->num_mcast = 0;
781
782 for (i = 0; i < dev->mc_count; i++) {
783 u8 *addr = dmi->dmi_addr;
784 u64 xaddr = 0;
785
786 if (addr[0] & 0x01) {/* multicast address? */
787 memcpy(&xaddr, addr, ETH_ALEN);
788 port->mcast_addr[port->num_mcast] = xaddr;
789 port->num_mcast++;
790 }
791 dmi = dmi->next;
792 }
793 }
794
795 write_unlock_irqrestore(&port->mcast_gate, flags);
796}
797
798static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
799{
800 strncpy(info->driver, "veth", sizeof(info->driver) - 1);
801 info->driver[sizeof(info->driver) - 1] = '\0';
802 strncpy(info->version, "1.0", sizeof(info->version) - 1);
803}
804
805static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
806{
807 ecmd->supported = (SUPPORTED_1000baseT_Full
808 | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
809 ecmd->advertising = (SUPPORTED_1000baseT_Full
810 | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
811 ecmd->port = PORT_FIBRE;
812 ecmd->transceiver = XCVR_INTERNAL;
813 ecmd->phy_address = 0;
814 ecmd->speed = SPEED_1000;
815 ecmd->duplex = DUPLEX_FULL;
816 ecmd->autoneg = AUTONEG_ENABLE;
817 ecmd->maxtxpkt = 120;
818 ecmd->maxrxpkt = 120;
819 return 0;
820}
821
822static u32 veth_get_link(struct net_device *dev)
823{
824 return 1;
825}
826
827static struct ethtool_ops ops = {
828 .get_drvinfo = veth_get_drvinfo,
829 .get_settings = veth_get_settings,
830 .get_link = veth_get_link,
831};
832
833static void veth_tx_timeout(struct net_device *dev)
834{
835 struct veth_port *port = (struct veth_port *)dev->priv;
836 struct net_device_stats *stats = &port->stats;
837 unsigned long flags;
838 int i;
839
840 stats->tx_errors++;
841
842 spin_lock_irqsave(&port->pending_gate, flags);
843
243cd55e
ME		 844 if (!port->pending_lpmask) {
845 spin_unlock_irqrestore(&port->pending_gate, flags);
846 return;
847 }
848
1da177e4
LT		 849 printk(KERN_WARNING "%s: Tx timeout! Resetting lp connections: %08x\n",
850 dev->name, port->pending_lpmask);
851
1da177e4
LT		 852 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
853 struct veth_lpar_connection *cnx = veth_cnx[i];
854
855 if (! (port->pending_lpmask & (1<<i)))
856 continue;
857
858 /* If we're pending on it, we must be connected to it,
859 * so we should certainly have a structure for it. */
860 BUG_ON(! cnx);
861
862 /* Theoretically we could be kicking a connection
863 * which doesn't deserve it, but in practice if we've
864 * had a Tx timeout, the pending_lpmask will have
865 * exactly one bit set - the connection causing the
866 * problem. */
867 spin_lock(&cnx->lock);
868 cnx->state |= VETH_STATE_RESET;
869 veth_kick_statemachine(cnx);
870 spin_unlock(&cnx->lock);
871 }
872
873 spin_unlock_irqrestore(&port->pending_gate, flags);
874}
875
876static struct net_device * __init veth_probe_one(int vlan, struct device *vdev)
877{
878 struct net_device *dev;
879 struct veth_port *port;
880 int i, rc;
881
882 dev = alloc_etherdev(sizeof (struct veth_port));
883 if (! dev) {
884 veth_error("Unable to allocate net_device structure!\n");
885 return NULL;
886 }
887
888 port = (struct veth_port *) dev->priv;
889
890 spin_lock_init(&port->pending_gate);
891 rwlock_init(&port->mcast_gate);
892
893 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
894 HvLpVirtualLanIndexMap map;
895
896 if (i == this_lp)
897 continue;
898 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
899 if (map & (0x8000 >> vlan))
900 port->lpar_map |= (1 << i);
901 }
902 port->dev = vdev;
903
904 dev->dev_addr[0] = 0x02;
905 dev->dev_addr[1] = 0x01;
906 dev->dev_addr[2] = 0xff;
907 dev->dev_addr[3] = vlan;
908 dev->dev_addr[4] = 0xff;
909 dev->dev_addr[5] = this_lp;
910
911 dev->mtu = VETH_MAX_MTU;
912
913 memcpy(&port->mac_addr, dev->dev_addr, 6);
914
915 dev->open = veth_open;
916 dev->hard_start_xmit = veth_start_xmit;
917 dev->stop = veth_close;
918 dev->get_stats = veth_get_stats;
919 dev->change_mtu = veth_change_mtu;
920 dev->set_mac_address = NULL;
921 dev->set_multicast_list = veth_set_multicast_list;
922 SET_ETHTOOL_OPS(dev, &ops);
923
924 dev->watchdog_timeo = 2 * (VETH_ACKTIMEOUT * HZ / 1000000);
925 dev->tx_timeout = veth_tx_timeout;
926
927 SET_NETDEV_DEV(dev, vdev);
928
929 rc = register_netdev(dev);
930 if (rc != 0) {
61a3c696 931 veth_error("Failed registering net device for vlan%d.\n", vlan);
1da177e4
LT		 932 free_netdev(dev);
933 return NULL;
934 }
935
61a3c696
ME		 936 veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
937 dev->name, vlan, port->lpar_map);
1da177e4
LT		 938
939 return dev;
940}
941
942/*
943 * Tx path
944 */
945
946static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
947 struct net_device *dev)
948{
949 struct veth_lpar_connection *cnx = veth_cnx[rlp];
950 struct veth_port *port = (struct veth_port *) dev->priv;
951 HvLpEvent_Rc rc;
1da177e4
LT		 952 struct veth_msg *msg = NULL;
953 int err = 0;
954 unsigned long flags;
955
956 if (! cnx) {
957 port->stats.tx_errors++;
958 dev_kfree_skb(skb);
959 return 0;
960 }
961
962 spin_lock_irqsave(&cnx->lock, flags);
963
f27eff1f 964 if (! (cnx->state & VETH_STATE_READY))
1da177e4
LT		 965 goto drop;
966
967 if ((skb->len - 14) > VETH_MAX_MTU)
968 goto drop;
969
970 msg = veth_stack_pop(cnx);
971
972 if (! msg) {
973 err = 1;
974 goto drop;
975 }
976
b08bd5c0
ME		 977 msg->in_use = 1;
978
cbf9074c
ME		 979 msg->data.addr[0] = dma_map_single(port->dev, skb->data,
980 skb->len, DMA_TO_DEVICE);
1da177e4 981
cbf9074c 982 if (dma_mapping_error(msg->data.addr[0]))
1da177e4
LT		 983 goto recycle_and_drop;
984
985 /* Is it really necessary to check the length and address
986 * fields of the first entry here? */
987 msg->skb = skb;
988 msg->dev = port->dev;
cbf9074c 989 msg->data.len[0] = skb->len;
1da177e4 990 msg->data.eofmask = 1 << VETH_EOF_SHIFT;
cbf9074c 991
1da177e4
LT		 992 rc = veth_signaldata(cnx, VethEventTypeFrames, msg->token, &msg->data);
993
994 if (rc != HvLpEvent_Rc_Good)
995 goto recycle_and_drop;
996
997 spin_unlock_irqrestore(&cnx->lock, flags);
998 return 0;
999
1000 recycle_and_drop:
b08bd5c0 1001 /* we free the skb below, so tell veth_recycle_msg() not to. */
1da177e4 1002 msg->skb = NULL;
1da177e4
LT		 1003 veth_recycle_msg(cnx, msg);
1004 drop:
1005 port->stats.tx_errors++;
1006 dev_kfree_skb(skb);
1007 spin_unlock_irqrestore(&cnx->lock, flags);
1008 return err;
1009}
1010
1011static HvLpIndexMap veth_transmit_to_many(struct sk_buff *skb,
1012 HvLpIndexMap lpmask,
1013 struct net_device *dev)
1014{
1015 struct veth_port *port = (struct veth_port *) dev->priv;
1016 int i;
1017 int rc;
1018
1019 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1020 if ((lpmask & (1 << i)) == 0)
1021 continue;
1022
1023 rc = veth_transmit_to_one(skb_get(skb), i, dev);
1024 if (! rc)
1025 lpmask &= ~(1<<i);
1026 }
1027
1028 if (! lpmask) {
1029 port->stats.tx_packets++;
1030 port->stats.tx_bytes += skb->len;
1031 }
1032
1033 return lpmask;
1034}
1035
1036static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1037{
1038 unsigned char *frame = skb->data;
1039 struct veth_port *port = (struct veth_port *) dev->priv;
1040 unsigned long flags;
1041 HvLpIndexMap lpmask;
1042
1043 if (! (frame[0] & 0x01)) {
1044 /* unicast packet */
1045 HvLpIndex rlp = frame[5];
1046
1047 if ( ! ((1 << rlp) & port->lpar_map) ) {
1048 dev_kfree_skb(skb);
1049 return 0;
1050 }
1051
1052 lpmask = 1 << rlp;
1053 } else {
1054 lpmask = port->lpar_map;
1055 }
1056
1057 spin_lock_irqsave(&port->pending_gate, flags);
1058
1059 lpmask = veth_transmit_to_many(skb, lpmask, dev);
1060
eb235aef
ME		 1061 dev->trans_start = jiffies;
1062
1da177e4
LT		 1063 if (! lpmask) {
1064 dev_kfree_skb(skb);
1065 } else {
1066 if (port->pending_skb) {
61a3c696 1067 veth_error("%s: TX while skb was pending!\n",
1da177e4
LT		 1068 dev->name);
1069 dev_kfree_skb(skb);
1070 spin_unlock_irqrestore(&port->pending_gate, flags);
1071 return 1;
1072 }
1073
1074 port->pending_skb = skb;
1075 port->pending_lpmask = lpmask;
1076 netif_stop_queue(dev);
1077 }
1078
1079 spin_unlock_irqrestore(&port->pending_gate, flags);
1080
1081 return 0;
1082}
1083
b08bd5c0 1084/* You must hold the connection's lock when you call this function. */
1da177e4
LT		 1085static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1086 struct veth_msg *msg)
1087{
1088 u32 dma_address, dma_length;
1089
b08bd5c0
ME		 1090 if (msg->in_use) {
1091 msg->in_use = 0;
1da177e4
LT		 1092 dma_address = msg->data.addr[0];
1093 dma_length = msg->data.len[0];
1094
cbf9074c
ME		 1095 if (!dma_mapping_error(dma_address))
1096 dma_unmap_single(msg->dev, dma_address, dma_length,
1097 DMA_TO_DEVICE);
1da177e4
LT		 1098
1099 if (msg->skb) {
1100 dev_kfree_skb_any(msg->skb);
1101 msg->skb = NULL;
1102 }
1103
1104 memset(&msg->data, 0, sizeof(msg->data));
1105 veth_stack_push(cnx, msg);
61a3c696
ME		 1106 } else if (cnx->state & VETH_STATE_OPEN) {
1107 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1108 cnx->remote_lp, msg->token);
1109 }
1da177e4
LT		 1110}
1111
1112static void veth_flush_pending(struct veth_lpar_connection *cnx)
1113{
1114 int i;
1115 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1116 struct net_device *dev = veth_dev[i];
1117 struct veth_port *port;
1118 unsigned long flags;
1119
1120 if (! dev)
1121 continue;
1122
1123 port = (struct veth_port *)dev->priv;
1124
1125 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1126 continue;
1127
1128 spin_lock_irqsave(&port->pending_gate, flags);
1129 if (port->pending_skb) {
1130 port->pending_lpmask =
1131 veth_transmit_to_many(port->pending_skb,
1132 port->pending_lpmask,
1133 dev);
1134 if (! port->pending_lpmask) {
1135 dev_kfree_skb_any(port->pending_skb);
1136 port->pending_skb = NULL;
1137 netif_wake_queue(dev);
1138 }
1139 }
1140 spin_unlock_irqrestore(&port->pending_gate, flags);
1141 }
1142}
1143
1144/*
1145 * Rx path
1146 */
1147
1148static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1149{
1150 int wanted = 0;
1151 int i;
1152 unsigned long flags;
1153
1154 if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1155 return 1;
1156
1da177e4
LT		 1157 read_lock_irqsave(&port->mcast_gate, flags);
1158
2a5391a1 1159 if (port->promiscuous) {
1da177e4
LT		 1160 wanted = 1;
1161 goto out;
1162 }
1163
1164 for (i = 0; i < port->num_mcast; ++i) {
1165 if (port->mcast_addr[i] == mac_addr) {
1166 wanted = 1;
1167 break;
1168 }
1169 }
1170
1171 out:
1172 read_unlock_irqrestore(&port->mcast_gate, flags);
1173
1174 return wanted;
1175}
1176
1177struct dma_chunk {
1178 u64 addr;
1179 u64 size;
1180};
1181
1182#define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1183
1184static inline void veth_build_dma_list(struct dma_chunk *list,
1185 unsigned char *p, unsigned long length)
1186{
1187 unsigned long done;
1188 int i = 1;
1189
1190 /* FIXME: skbs are continguous in real addresses. Do we
1191 * really need to break it into PAGE_SIZE chunks, or can we do
1192 * it just at the granularity of iSeries real->absolute
1193 * mapping? Indeed, given the way the allocator works, can we
1194 * count on them being absolutely contiguous? */
1195 list[0].addr = ISERIES_HV_ADDR(p);
1196 list[0].size = min(length,
1197 PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1198
1199 done = list[0].size;
1200 while (done < length) {
1201 list[i].addr = ISERIES_HV_ADDR(p + done);
1202 list[i].size = min(length-done, PAGE_SIZE);
1203 done += list[i].size;
1204 i++;
1205 }
1206}
1207
1208static void veth_flush_acks(struct veth_lpar_connection *cnx)
1209{
1210 HvLpEvent_Rc rc;
1211
1212 rc = veth_signaldata(cnx, VethEventTypeFramesAck,
1213 0, &cnx->pending_acks);
1214
1215 if (rc != HvLpEvent_Rc_Good)
61a3c696
ME		 1216 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1217 cnx->remote_lp, (int)rc);
1da177e4
LT		 1218
1219 cnx->num_pending_acks = 0;
1220 memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1221}
1222
1223static void veth_receive(struct veth_lpar_connection *cnx,
1224 struct VethLpEvent *event)
1225{
1226 struct VethFramesData *senddata = &event->u.frames_data;
1227 int startchunk = 0;
1228 int nchunks;
1229 unsigned long flags;
1230 HvLpDma_Rc rc;
1231
1232 do {
1233 u16 length = 0;
1234 struct sk_buff *skb;
1235 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1236 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1237 u64 dest;
1238 HvLpVirtualLanIndex vlan;
1239 struct net_device *dev;
1240 struct veth_port *port;
1241
1242 /* FIXME: do we need this? */
1243 memset(local_list, 0, sizeof(local_list));
1244 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1245
1246 /* a 0 address marks the end of the valid entries */
1247 if (senddata->addr[startchunk] == 0)
1248 break;
1249
1250 /* make sure that we have at least 1 EOF entry in the
1251 * remaining entries */
1252 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
61a3c696
ME		 1253 veth_error("Missing EOF fragment in event "
1254 "eofmask = 0x%x startchunk = %d\n",
1255 (unsigned)senddata->eofmask,
1256 startchunk);
1da177e4
LT		 1257 break;
1258 }
1259
1260 /* build list of chunks in this frame */
1261 nchunks = 0;
1262 do {
1263 remote_list[nchunks].addr =
1264 (u64) senddata->addr[startchunk+nchunks] << 32;
1265 remote_list[nchunks].size =
1266 senddata->len[startchunk+nchunks];
1267 length += remote_list[nchunks].size;
1268 } while (! (senddata->eofmask &
1269 (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1270
1271 /* length == total length of all chunks */
1272 /* nchunks == # of chunks in this frame */
1273
1274 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
61a3c696
ME		 1275 veth_error("Received oversize frame from LPAR %d "
1276 "(length = %d)\n",
1277 cnx->remote_lp, length);
1da177e4
LT		 1278 continue;
1279 }
1280
1281 skb = alloc_skb(length, GFP_ATOMIC);
1282 if (!skb)
1283 continue;
1284
1285 veth_build_dma_list(local_list, skb->data, length);
1286
1287 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1288 event->base_event.xSourceLp,
1289 HvLpDma_Direction_RemoteToLocal,
1290 cnx->src_inst,
1291 cnx->dst_inst,
1292 HvLpDma_AddressType_RealAddress,
1293 HvLpDma_AddressType_TceIndex,
1294 ISERIES_HV_ADDR(&local_list),
1295 ISERIES_HV_ADDR(&remote_list),
1296 length);
1297 if (rc != HvLpDma_Rc_Good) {
1298 dev_kfree_skb_irq(skb);
1299 continue;
1300 }
1301
1302 vlan = skb->data[9];
1303 dev = veth_dev[vlan];
41664c03
ME		 1304 if (! dev) {
1305 /*
1306 * Some earlier versions of the driver sent
1307 * broadcasts down all connections, even to lpars
1308 * that weren't on the relevant vlan. So ignore
1309 * packets belonging to a vlan we're not on.
1310 * We can also be here if we receive packets while
1311 * the driver is going down, because then dev is NULL.
1312 */
1313 dev_kfree_skb_irq(skb);
1da177e4 1314 continue;
41664c03 1315 }
1da177e4
LT		 1316
1317 port = (struct veth_port *)dev->priv;
1318 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1319
1320 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1321 dev_kfree_skb_irq(skb);
1322 continue;
1323 }
1324 if (! veth_frame_wanted(port, dest)) {
1325 dev_kfree_skb_irq(skb);
1326 continue;
1327 }
1328
1329 skb_put(skb, length);
1330 skb->dev = dev;
1331 skb->protocol = eth_type_trans(skb, dev);
1332 skb->ip_summed = CHECKSUM_NONE;
1333 netif_rx(skb); /* send it up */
1334 port->stats.rx_packets++;
1335 port->stats.rx_bytes += length;
1336 } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1337
1338 /* Ack it */
1339 spin_lock_irqsave(&cnx->lock, flags);
1340 BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1341
1342 cnx->pending_acks[cnx->num_pending_acks++] =
1343 event->base_event.xCorrelationToken;
1344
1345 if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1346 || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1347 veth_flush_acks(cnx);
1348
1349 spin_unlock_irqrestore(&cnx->lock, flags);
1350}
1351
1352static void veth_timed_ack(unsigned long ptr)
1353{
1354 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1355 unsigned long flags;
1356
1357 /* Ack all the events */
1358 spin_lock_irqsave(&cnx->lock, flags);
1359 if (cnx->num_pending_acks > 0)
1360 veth_flush_acks(cnx);
1361
1362 /* Reschedule the timer */
1363 cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1364 add_timer(&cnx->ack_timer);
1365 spin_unlock_irqrestore(&cnx->lock, flags);
1366}
1367
1368static int veth_remove(struct vio_dev *vdev)
1369{
f0c129ca 1370 struct veth_lpar_connection *cnx;
1da177e4 1371 struct net_device *dev;
f0c129ca
ME		 1372 struct veth_port *port;
1373 int i;
1da177e4 1374
f0c129ca
ME		 1375 dev = veth_dev[vdev->unit_address];
1376
1377 if (! dev)
1378 return 0;
1379
1380 port = netdev_priv(dev);
1381
1382 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1383 cnx = veth_cnx[i];
1384
1385 if (cnx && (port->lpar_map & (1 << i))) {
1386 /* Drop our reference to connections on our VLAN */
1387 kobject_put(&cnx->kobject);
1388 }
1da177e4 1389 }
f0c129ca
ME		 1390
1391 veth_dev[vdev->unit_address] = NULL;
1392 unregister_netdev(dev);
1393 free_netdev(dev);
1394
1da177e4
LT		 1395 return 0;
1396}
1397
1398static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1399{
1400 int i = vdev->unit_address;
1401 struct net_device *dev;
f0c129ca 1402 struct veth_port *port;
1da177e4
LT		 1403
1404 dev = veth_probe_one(i, &vdev->dev);
1405 if (dev == NULL) {
1406 veth_remove(vdev);
1407 return 1;
1408 }
1409 veth_dev[i] = dev;
1410
f0c129ca
ME		 1411 port = (struct veth_port*)netdev_priv(dev);
1412
1413 /* Start the state machine on each connection on this vlan. If we're
1414 * the first dev to do so this will commence link negotiation */
1415 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1416 struct veth_lpar_connection *cnx;
1417
1418 if (! (port->lpar_map & (1 << i)))
1419 continue;
1420
1421 cnx = veth_cnx[i];
1422 if (!cnx)
1423 continue;
1424
1425 kobject_get(&cnx->kobject);
1426 veth_kick_statemachine(cnx);
1427 }
1da177e4
LT		 1428
1429 return 0;
1430}
1431
1432/**
1433 * veth_device_table: Used by vio.c to match devices that we
1434 * support.
1435 */
1436static struct vio_device_id veth_device_table[] __devinitdata = {
1437 { "vlan", "" },
fb120da6 1438 { "", "" }
1da177e4
LT		 1439};
1440MODULE_DEVICE_TABLE(vio, veth_device_table);
1441
1442static struct vio_driver veth_driver = {
1443 .name = "iseries_veth",
1444 .id_table = veth_device_table,
1445 .probe = veth_probe,
1446 .remove = veth_remove
1447};
1448
1449/*
1450 * Module initialization/cleanup
1451 */
1452
1453void __exit veth_module_cleanup(void)
1454{
1455 int i;
f0c129ca 1456 struct veth_lpar_connection *cnx;
1da177e4 1457
f0c129ca 1458 /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1da177e4
LT		 1459 HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1460
f0c129ca 1461 /* Make sure any work queued from Hypervisor callbacks is finished. */
1da177e4
LT		 1462 flush_scheduled_work();
1463
f0c129ca
ME		 1464 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1465 cnx = veth_cnx[i];
1466
1467 if (!cnx)
1468 continue;
b2e0852e 1469
f0c129ca
ME		 1470 /* Drop the driver's reference to the connection */
1471 kobject_put(&cnx->kobject);
1472 }
1da177e4 1473
f0c129ca
ME		 1474 /* Unregister the driver, which will close all the netdevs and stop
1475 * the connections when they're no longer referenced. */
1476 vio_unregister_driver(&veth_driver);
1da177e4
LT		 1477}
1478module_exit(veth_module_cleanup);
1479
1480int __init veth_module_init(void)
1481{
1482 int i;
1483 int rc;
1484
1485 this_lp = HvLpConfig_getLpIndex_outline();
1486
1487 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1488 rc = veth_init_connection(i);
ec60beeb
ME		 1489 if (rc != 0)
1490 goto error;
1da177e4
LT		 1491 }
1492
1493 HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1494 &veth_handle_event);
1495
ec60beeb
ME		 1496 rc = vio_register_driver(&veth_driver);
1497 if (rc != 0)
1498 goto error;
1499
1500 return 0;
1501
1502error:
1503 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
f0c129ca 1504 veth_destroy_connection(veth_cnx[i]);
ec60beeb
ME		 1505 }
1506
1507 return rc;
1da177e4
LT		 1508}
1509module_init(veth_module_init);
kernel source for telekom puls (alcatel/mediatek)