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