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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 | ||
82 | #include "iseries_veth.h" | |
83 | ||
84 | MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>"); | |
85 | MODULE_DESCRIPTION("iSeries Virtual ethernet driver"); | |
86 | MODULE_LICENSE("GPL"); | |
87 | ||
88 | #define VETH_NUMBUFFERS (120) | |
89 | #define VETH_ACKTIMEOUT (1000000) /* microseconds */ | |
90 | #define VETH_MAX_MCAST (12) | |
91 | ||
92 | #define VETH_MAX_MTU (9000) | |
93 | ||
94 | #if VETH_NUMBUFFERS < 10 | |
95 | #define ACK_THRESHOLD (1) | |
96 | #elif VETH_NUMBUFFERS < 20 | |
97 | #define ACK_THRESHOLD (4) | |
98 | #elif VETH_NUMBUFFERS < 40 | |
99 | #define ACK_THRESHOLD (10) | |
100 | #else | |
101 | #define ACK_THRESHOLD (20) | |
102 | #endif | |
103 | ||
104 | #define VETH_STATE_SHUTDOWN (0x0001) | |
105 | #define VETH_STATE_OPEN (0x0002) | |
106 | #define VETH_STATE_RESET (0x0004) | |
107 | #define VETH_STATE_SENTMON (0x0008) | |
108 | #define VETH_STATE_SENTCAPS (0x0010) | |
109 | #define VETH_STATE_GOTCAPACK (0x0020) | |
110 | #define VETH_STATE_GOTCAPS (0x0040) | |
111 | #define VETH_STATE_SENTCAPACK (0x0080) | |
112 | #define VETH_STATE_READY (0x0100) | |
113 | ||
114 | struct veth_msg { | |
115 | struct veth_msg *next; | |
116 | struct VethFramesData data; | |
117 | int token; | |
118 | unsigned long in_use; | |
119 | struct sk_buff *skb; | |
120 | struct device *dev; | |
121 | }; | |
122 | ||
123 | struct veth_lpar_connection { | |
124 | HvLpIndex remote_lp; | |
125 | struct work_struct statemachine_wq; | |
126 | struct veth_msg *msgs; | |
127 | int num_events; | |
128 | struct VethCapData local_caps; | |
129 | ||
130 | struct timer_list ack_timer; | |
131 | ||
132 | spinlock_t lock; | |
133 | unsigned long state; | |
134 | HvLpInstanceId src_inst; | |
135 | HvLpInstanceId dst_inst; | |
136 | struct VethLpEvent cap_event, cap_ack_event; | |
137 | u16 pending_acks[VETH_MAX_ACKS_PER_MSG]; | |
138 | u32 num_pending_acks; | |
139 | ||
140 | int num_ack_events; | |
141 | struct VethCapData remote_caps; | |
142 | u32 ack_timeout; | |
143 | ||
144 | spinlock_t msg_stack_lock; | |
145 | struct veth_msg *msg_stack_head; | |
146 | }; | |
147 | ||
148 | struct veth_port { | |
149 | struct device *dev; | |
150 | struct net_device_stats stats; | |
151 | u64 mac_addr; | |
152 | HvLpIndexMap lpar_map; | |
153 | ||
154 | spinlock_t pending_gate; | |
155 | struct sk_buff *pending_skb; | |
156 | HvLpIndexMap pending_lpmask; | |
157 | ||
158 | rwlock_t mcast_gate; | |
159 | int promiscuous; | |
160 | int all_mcast; | |
161 | int num_mcast; | |
162 | u64 mcast_addr[VETH_MAX_MCAST]; | |
163 | }; | |
164 | ||
165 | static HvLpIndex this_lp; | |
166 | static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */ | |
167 | static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */ | |
168 | ||
169 | static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev); | |
170 | static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *); | |
171 | static void veth_flush_pending(struct veth_lpar_connection *cnx); | |
172 | static void veth_receive(struct veth_lpar_connection *, struct VethLpEvent *); | |
173 | static void veth_timed_ack(unsigned long connectionPtr); | |
174 | ||
175 | /* | |
176 | * Utility functions | |
177 | */ | |
178 | ||
179 | #define veth_printk(prio, fmt, args...) \ | |
180 | printk(prio "%s: " fmt, __FILE__, ## args) | |
181 | ||
182 | #define veth_error(fmt, args...) \ | |
183 | printk(KERN_ERR "(%s:%3.3d) ERROR: " fmt, __FILE__, __LINE__ , ## args) | |
184 | ||
185 | static inline void veth_stack_push(struct veth_lpar_connection *cnx, | |
186 | struct veth_msg *msg) | |
187 | { | |
188 | unsigned long flags; | |
189 | ||
190 | spin_lock_irqsave(&cnx->msg_stack_lock, flags); | |
191 | msg->next = cnx->msg_stack_head; | |
192 | cnx->msg_stack_head = msg; | |
193 | spin_unlock_irqrestore(&cnx->msg_stack_lock, flags); | |
194 | } | |
195 | ||
196 | static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx) | |
197 | { | |
198 | unsigned long flags; | |
199 | struct veth_msg *msg; | |
200 | ||
201 | spin_lock_irqsave(&cnx->msg_stack_lock, flags); | |
202 | msg = cnx->msg_stack_head; | |
203 | if (msg) | |
204 | cnx->msg_stack_head = cnx->msg_stack_head->next; | |
205 | spin_unlock_irqrestore(&cnx->msg_stack_lock, flags); | |
206 | return msg; | |
207 | } | |
208 | ||
209 | static inline HvLpEvent_Rc | |
210 | veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype, | |
211 | HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype, | |
212 | u64 token, | |
213 | u64 data1, u64 data2, u64 data3, u64 data4, u64 data5) | |
214 | { | |
215 | return HvCallEvent_signalLpEventFast(cnx->remote_lp, | |
216 | HvLpEvent_Type_VirtualLan, | |
217 | subtype, ackind, acktype, | |
218 | cnx->src_inst, | |
219 | cnx->dst_inst, | |
220 | token, data1, data2, data3, | |
221 | data4, data5); | |
222 | } | |
223 | ||
224 | static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx, | |
225 | u16 subtype, u64 token, void *data) | |
226 | { | |
227 | u64 *p = (u64 *) data; | |
228 | ||
229 | return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck, | |
230 | HvLpEvent_AckType_ImmediateAck, | |
231 | token, p[0], p[1], p[2], p[3], p[4]); | |
232 | } | |
233 | ||
234 | struct veth_allocation { | |
235 | struct completion c; | |
236 | int num; | |
237 | }; | |
238 | ||
239 | static void veth_complete_allocation(void *parm, int number) | |
240 | { | |
241 | struct veth_allocation *vc = (struct veth_allocation *)parm; | |
242 | ||
243 | vc->num = number; | |
244 | complete(&vc->c); | |
245 | } | |
246 | ||
247 | static int veth_allocate_events(HvLpIndex rlp, int number) | |
248 | { | |
249 | struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 }; | |
250 | ||
251 | mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan, | |
252 | sizeof(struct VethLpEvent), number, | |
253 | &veth_complete_allocation, &vc); | |
254 | wait_for_completion(&vc.c); | |
255 | ||
256 | return vc.num; | |
257 | } | |
258 | ||
259 | /* | |
260 | * LPAR connection code | |
261 | */ | |
262 | ||
263 | static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx) | |
264 | { | |
265 | schedule_work(&cnx->statemachine_wq); | |
266 | } | |
267 | ||
268 | static void veth_take_cap(struct veth_lpar_connection *cnx, | |
269 | struct VethLpEvent *event) | |
270 | { | |
271 | unsigned long flags; | |
272 | ||
273 | spin_lock_irqsave(&cnx->lock, flags); | |
274 | /* Receiving caps may mean the other end has just come up, so | |
275 | * we need to reload the instance ID of the far end */ | |
276 | cnx->dst_inst = | |
277 | HvCallEvent_getTargetLpInstanceId(cnx->remote_lp, | |
278 | HvLpEvent_Type_VirtualLan); | |
279 | ||
280 | if (cnx->state & VETH_STATE_GOTCAPS) { | |
281 | veth_error("Received a second capabilities from lpar %d\n", | |
282 | cnx->remote_lp); | |
283 | event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable; | |
284 | HvCallEvent_ackLpEvent((struct HvLpEvent *) event); | |
285 | } else { | |
286 | memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event)); | |
287 | cnx->state |= VETH_STATE_GOTCAPS; | |
288 | veth_kick_statemachine(cnx); | |
289 | } | |
290 | spin_unlock_irqrestore(&cnx->lock, flags); | |
291 | } | |
292 | ||
293 | static void veth_take_cap_ack(struct veth_lpar_connection *cnx, | |
294 | struct VethLpEvent *event) | |
295 | { | |
296 | unsigned long flags; | |
297 | ||
298 | spin_lock_irqsave(&cnx->lock, flags); | |
299 | if (cnx->state & VETH_STATE_GOTCAPACK) { | |
300 | veth_error("Received a second capabilities ack from lpar %d\n", | |
301 | cnx->remote_lp); | |
302 | } else { | |
303 | memcpy(&cnx->cap_ack_event, event, | |
304 | sizeof(&cnx->cap_ack_event)); | |
305 | cnx->state |= VETH_STATE_GOTCAPACK; | |
306 | veth_kick_statemachine(cnx); | |
307 | } | |
308 | spin_unlock_irqrestore(&cnx->lock, flags); | |
309 | } | |
310 | ||
311 | static void veth_take_monitor_ack(struct veth_lpar_connection *cnx, | |
312 | struct VethLpEvent *event) | |
313 | { | |
314 | unsigned long flags; | |
315 | ||
316 | spin_lock_irqsave(&cnx->lock, flags); | |
317 | veth_printk(KERN_DEBUG, "Monitor ack returned for lpar %d\n", | |
318 | cnx->remote_lp); | |
319 | cnx->state |= VETH_STATE_RESET; | |
320 | veth_kick_statemachine(cnx); | |
321 | spin_unlock_irqrestore(&cnx->lock, flags); | |
322 | } | |
323 | ||
324 | static void veth_handle_ack(struct VethLpEvent *event) | |
325 | { | |
326 | HvLpIndex rlp = event->base_event.xTargetLp; | |
327 | struct veth_lpar_connection *cnx = veth_cnx[rlp]; | |
328 | ||
329 | BUG_ON(! cnx); | |
330 | ||
331 | switch (event->base_event.xSubtype) { | |
332 | case VethEventTypeCap: | |
333 | veth_take_cap_ack(cnx, event); | |
334 | break; | |
335 | case VethEventTypeMonitor: | |
336 | veth_take_monitor_ack(cnx, event); | |
337 | break; | |
338 | default: | |
339 | veth_error("Unknown ack type %d from lpar %d\n", | |
340 | event->base_event.xSubtype, rlp); | |
341 | }; | |
342 | } | |
343 | ||
344 | static void veth_handle_int(struct VethLpEvent *event) | |
345 | { | |
346 | HvLpIndex rlp = event->base_event.xSourceLp; | |
347 | struct veth_lpar_connection *cnx = veth_cnx[rlp]; | |
348 | unsigned long flags; | |
349 | int i; | |
350 | ||
351 | BUG_ON(! cnx); | |
352 | ||
353 | switch (event->base_event.xSubtype) { | |
354 | case VethEventTypeCap: | |
355 | veth_take_cap(cnx, event); | |
356 | break; | |
357 | case VethEventTypeMonitor: | |
358 | /* do nothing... this'll hang out here til we're dead, | |
359 | * and the hypervisor will return it for us. */ | |
360 | break; | |
361 | case VethEventTypeFramesAck: | |
362 | spin_lock_irqsave(&cnx->lock, flags); | |
363 | for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) { | |
364 | u16 msgnum = event->u.frames_ack_data.token[i]; | |
365 | ||
366 | if (msgnum < VETH_NUMBUFFERS) | |
367 | veth_recycle_msg(cnx, cnx->msgs + msgnum); | |
368 | } | |
369 | spin_unlock_irqrestore(&cnx->lock, flags); | |
370 | veth_flush_pending(cnx); | |
371 | break; | |
372 | case VethEventTypeFrames: | |
373 | veth_receive(cnx, event); | |
374 | break; | |
375 | default: | |
376 | veth_error("Unknown interrupt type %d from lpar %d\n", | |
377 | event->base_event.xSubtype, rlp); | |
378 | }; | |
379 | } | |
380 | ||
381 | static void veth_handle_event(struct HvLpEvent *event, struct pt_regs *regs) | |
382 | { | |
383 | struct VethLpEvent *veth_event = (struct VethLpEvent *)event; | |
384 | ||
385 | if (event->xFlags.xFunction == HvLpEvent_Function_Ack) | |
386 | veth_handle_ack(veth_event); | |
387 | else if (event->xFlags.xFunction == HvLpEvent_Function_Int) | |
388 | veth_handle_int(veth_event); | |
389 | } | |
390 | ||
391 | static int veth_process_caps(struct veth_lpar_connection *cnx) | |
392 | { | |
393 | struct VethCapData *remote_caps = &cnx->remote_caps; | |
394 | int num_acks_needed; | |
395 | ||
396 | /* Convert timer to jiffies */ | |
397 | cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000; | |
398 | ||
399 | if ( (remote_caps->num_buffers == 0) | |
400 | || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG) | |
401 | || (remote_caps->ack_threshold == 0) | |
402 | || (cnx->ack_timeout == 0) ) { | |
403 | veth_error("Received incompatible capabilities from lpar %d\n", | |
404 | cnx->remote_lp); | |
405 | return HvLpEvent_Rc_InvalidSubtypeData; | |
406 | } | |
407 | ||
408 | num_acks_needed = (remote_caps->num_buffers | |
409 | / remote_caps->ack_threshold) + 1; | |
410 | ||
411 | /* FIXME: locking on num_ack_events? */ | |
412 | if (cnx->num_ack_events < num_acks_needed) { | |
413 | int num; | |
414 | ||
415 | num = veth_allocate_events(cnx->remote_lp, | |
416 | num_acks_needed-cnx->num_ack_events); | |
417 | if (num > 0) | |
418 | cnx->num_ack_events += num; | |
419 | ||
420 | if (cnx->num_ack_events < num_acks_needed) { | |
421 | veth_error("Couldn't allocate enough ack events for lpar %d\n", | |
422 | cnx->remote_lp); | |
423 | ||
424 | return HvLpEvent_Rc_BufferNotAvailable; | |
425 | } | |
426 | } | |
427 | ||
428 | ||
429 | return HvLpEvent_Rc_Good; | |
430 | } | |
431 | ||
432 | /* FIXME: The gotos here are a bit dubious */ | |
433 | static void veth_statemachine(void *p) | |
434 | { | |
435 | struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)p; | |
436 | int rlp = cnx->remote_lp; | |
437 | int rc; | |
438 | ||
439 | spin_lock_irq(&cnx->lock); | |
440 | ||
441 | restart: | |
442 | if (cnx->state & VETH_STATE_RESET) { | |
443 | int i; | |
444 | ||
445 | del_timer(&cnx->ack_timer); | |
446 | ||
447 | if (cnx->state & VETH_STATE_OPEN) | |
448 | HvCallEvent_closeLpEventPath(cnx->remote_lp, | |
449 | HvLpEvent_Type_VirtualLan); | |
450 | ||
451 | /* reset ack data */ | |
452 | memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks)); | |
453 | cnx->num_pending_acks = 0; | |
454 | ||
455 | cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON | |
456 | | VETH_STATE_OPEN | VETH_STATE_SENTCAPS | |
457 | | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS | |
458 | | VETH_STATE_SENTCAPACK | VETH_STATE_READY); | |
459 | ||
460 | /* Clean up any leftover messages */ | |
461 | if (cnx->msgs) | |
462 | for (i = 0; i < VETH_NUMBUFFERS; ++i) | |
463 | veth_recycle_msg(cnx, cnx->msgs + i); | |
464 | spin_unlock_irq(&cnx->lock); | |
465 | veth_flush_pending(cnx); | |
466 | spin_lock_irq(&cnx->lock); | |
467 | if (cnx->state & VETH_STATE_RESET) | |
468 | goto restart; | |
469 | } | |
470 | ||
471 | if (cnx->state & VETH_STATE_SHUTDOWN) | |
472 | /* It's all over, do nothing */ | |
473 | goto out; | |
474 | ||
475 | if ( !(cnx->state & VETH_STATE_OPEN) ) { | |
476 | if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) ) | |
477 | goto cant_cope; | |
478 | ||
479 | HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan); | |
480 | cnx->src_inst = | |
481 | HvCallEvent_getSourceLpInstanceId(rlp, | |
482 | HvLpEvent_Type_VirtualLan); | |
483 | cnx->dst_inst = | |
484 | HvCallEvent_getTargetLpInstanceId(rlp, | |
485 | HvLpEvent_Type_VirtualLan); | |
486 | cnx->state |= VETH_STATE_OPEN; | |
487 | } | |
488 | ||
489 | if ( (cnx->state & VETH_STATE_OPEN) | |
490 | && !(cnx->state & VETH_STATE_SENTMON) ) { | |
491 | rc = veth_signalevent(cnx, VethEventTypeMonitor, | |
492 | HvLpEvent_AckInd_DoAck, | |
493 | HvLpEvent_AckType_DeferredAck, | |
494 | 0, 0, 0, 0, 0, 0); | |
495 | ||
496 | if (rc == HvLpEvent_Rc_Good) { | |
497 | cnx->state |= VETH_STATE_SENTMON; | |
498 | } else { | |
499 | if ( (rc != HvLpEvent_Rc_PartitionDead) | |
500 | && (rc != HvLpEvent_Rc_PathClosed) ) | |
501 | veth_error("Error sending monitor to " | |
502 | "lpar %d, rc=%x\n", | |
503 | rlp, (int) rc); | |
504 | ||
505 | /* Oh well, hope we get a cap from the other | |
506 | * end and do better when that kicks us */ | |
507 | goto out; | |
508 | } | |
509 | } | |
510 | ||
511 | if ( (cnx->state & VETH_STATE_OPEN) | |
512 | && !(cnx->state & VETH_STATE_SENTCAPS)) { | |
513 | u64 *rawcap = (u64 *)&cnx->local_caps; | |
514 | ||
515 | rc = veth_signalevent(cnx, VethEventTypeCap, | |
516 | HvLpEvent_AckInd_DoAck, | |
517 | HvLpEvent_AckType_ImmediateAck, | |
518 | 0, rawcap[0], rawcap[1], rawcap[2], | |
519 | rawcap[3], rawcap[4]); | |
520 | ||
521 | if (rc == HvLpEvent_Rc_Good) { | |
522 | cnx->state |= VETH_STATE_SENTCAPS; | |
523 | } else { | |
524 | if ( (rc != HvLpEvent_Rc_PartitionDead) | |
525 | && (rc != HvLpEvent_Rc_PathClosed) ) | |
526 | veth_error("Error sending caps to " | |
527 | "lpar %d, rc=%x\n", | |
528 | rlp, (int) rc); | |
529 | /* Oh well, hope we get a cap from the other | |
530 | * end and do better when that kicks us */ | |
531 | goto out; | |
532 | } | |
533 | } | |
534 | ||
535 | if ((cnx->state & VETH_STATE_GOTCAPS) | |
536 | && !(cnx->state & VETH_STATE_SENTCAPACK)) { | |
537 | struct VethCapData *remote_caps = &cnx->remote_caps; | |
538 | ||
539 | memcpy(remote_caps, &cnx->cap_event.u.caps_data, | |
540 | sizeof(*remote_caps)); | |
541 | ||
542 | spin_unlock_irq(&cnx->lock); | |
543 | rc = veth_process_caps(cnx); | |
544 | spin_lock_irq(&cnx->lock); | |
545 | ||
546 | /* We dropped the lock, so recheck for anything which | |
547 | * might mess us up */ | |
548 | if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN)) | |
549 | goto restart; | |
550 | ||
551 | cnx->cap_event.base_event.xRc = rc; | |
552 | HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event); | |
553 | if (rc == HvLpEvent_Rc_Good) | |
554 | cnx->state |= VETH_STATE_SENTCAPACK; | |
555 | else | |
556 | goto cant_cope; | |
557 | } | |
558 | ||
559 | if ((cnx->state & VETH_STATE_GOTCAPACK) | |
560 | && (cnx->state & VETH_STATE_GOTCAPS) | |
561 | && !(cnx->state & VETH_STATE_READY)) { | |
562 | if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) { | |
563 | /* Start the ACK timer */ | |
564 | cnx->ack_timer.expires = jiffies + cnx->ack_timeout; | |
565 | add_timer(&cnx->ack_timer); | |
566 | cnx->state |= VETH_STATE_READY; | |
567 | } else { | |
568 | veth_printk(KERN_ERR, "Caps rejected (rc=%d) by " | |
569 | "lpar %d\n", | |
570 | cnx->cap_ack_event.base_event.xRc, | |
571 | rlp); | |
572 | goto cant_cope; | |
573 | } | |
574 | } | |
575 | ||
576 | out: | |
577 | spin_unlock_irq(&cnx->lock); | |
578 | return; | |
579 | ||
580 | cant_cope: | |
581 | /* FIXME: we get here if something happens we really can't | |
582 | * cope with. The link will never work once we get here, and | |
583 | * all we can do is not lock the rest of the system up */ | |
584 | veth_error("Badness on connection to lpar %d (state=%04lx) " | |
585 | " - shutting down\n", rlp, cnx->state); | |
586 | cnx->state |= VETH_STATE_SHUTDOWN; | |
587 | spin_unlock_irq(&cnx->lock); | |
588 | } | |
589 | ||
590 | static int veth_init_connection(u8 rlp) | |
591 | { | |
592 | struct veth_lpar_connection *cnx; | |
593 | struct veth_msg *msgs; | |
594 | int i; | |
595 | ||
596 | if ( (rlp == this_lp) | |
597 | || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) ) | |
598 | return 0; | |
599 | ||
600 | cnx = kmalloc(sizeof(*cnx), GFP_KERNEL); | |
601 | if (! cnx) | |
602 | return -ENOMEM; | |
603 | memset(cnx, 0, sizeof(*cnx)); | |
604 | ||
605 | cnx->remote_lp = rlp; | |
606 | spin_lock_init(&cnx->lock); | |
607 | INIT_WORK(&cnx->statemachine_wq, veth_statemachine, cnx); | |
608 | init_timer(&cnx->ack_timer); | |
609 | cnx->ack_timer.function = veth_timed_ack; | |
610 | cnx->ack_timer.data = (unsigned long) cnx; | |
611 | memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks)); | |
612 | ||
613 | veth_cnx[rlp] = cnx; | |
614 | ||
615 | msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL); | |
616 | if (! msgs) { | |
617 | veth_error("Can't allocate buffers for lpar %d\n", rlp); | |
618 | return -ENOMEM; | |
619 | } | |
620 | ||
621 | cnx->msgs = msgs; | |
622 | memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg)); | |
623 | spin_lock_init(&cnx->msg_stack_lock); | |
624 | ||
625 | for (i = 0; i < VETH_NUMBUFFERS; i++) { | |
626 | msgs[i].token = i; | |
627 | veth_stack_push(cnx, msgs + i); | |
628 | } | |
629 | ||
630 | cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS); | |
631 | ||
632 | if (cnx->num_events < (2 + VETH_NUMBUFFERS)) { | |
633 | veth_error("Can't allocate events for lpar %d, only got %d\n", | |
634 | rlp, cnx->num_events); | |
635 | return -ENOMEM; | |
636 | } | |
637 | ||
638 | cnx->local_caps.num_buffers = VETH_NUMBUFFERS; | |
639 | cnx->local_caps.ack_threshold = ACK_THRESHOLD; | |
640 | cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT; | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
645 | static void veth_stop_connection(u8 rlp) | |
646 | { | |
647 | struct veth_lpar_connection *cnx = veth_cnx[rlp]; | |
648 | ||
649 | if (! cnx) | |
650 | return; | |
651 | ||
652 | spin_lock_irq(&cnx->lock); | |
653 | cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN; | |
654 | veth_kick_statemachine(cnx); | |
655 | spin_unlock_irq(&cnx->lock); | |
656 | ||
657 | flush_scheduled_work(); | |
658 | ||
659 | /* FIXME: not sure if this is necessary - will already have | |
660 | * been deleted by the state machine, just want to make sure | |
661 | * its not running any more */ | |
662 | del_timer_sync(&cnx->ack_timer); | |
663 | ||
664 | if (cnx->num_events > 0) | |
665 | mf_deallocate_lp_events(cnx->remote_lp, | |
666 | HvLpEvent_Type_VirtualLan, | |
667 | cnx->num_events, | |
668 | NULL, NULL); | |
669 | if (cnx->num_ack_events > 0) | |
670 | mf_deallocate_lp_events(cnx->remote_lp, | |
671 | HvLpEvent_Type_VirtualLan, | |
672 | cnx->num_ack_events, | |
673 | NULL, NULL); | |
674 | } | |
675 | ||
676 | static void veth_destroy_connection(u8 rlp) | |
677 | { | |
678 | struct veth_lpar_connection *cnx = veth_cnx[rlp]; | |
679 | ||
680 | if (! cnx) | |
681 | return; | |
682 | ||
683 | kfree(cnx->msgs); | |
684 | kfree(cnx); | |
685 | veth_cnx[rlp] = NULL; | |
686 | } | |
687 | ||
688 | /* | |
689 | * net_device code | |
690 | */ | |
691 | ||
692 | static int veth_open(struct net_device *dev) | |
693 | { | |
694 | struct veth_port *port = (struct veth_port *) dev->priv; | |
695 | ||
696 | memset(&port->stats, 0, sizeof (port->stats)); | |
697 | netif_start_queue(dev); | |
698 | return 0; | |
699 | } | |
700 | ||
701 | static int veth_close(struct net_device *dev) | |
702 | { | |
703 | netif_stop_queue(dev); | |
704 | return 0; | |
705 | } | |
706 | ||
707 | static struct net_device_stats *veth_get_stats(struct net_device *dev) | |
708 | { | |
709 | struct veth_port *port = (struct veth_port *) dev->priv; | |
710 | ||
711 | return &port->stats; | |
712 | } | |
713 | ||
714 | static int veth_change_mtu(struct net_device *dev, int new_mtu) | |
715 | { | |
716 | if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU)) | |
717 | return -EINVAL; | |
718 | dev->mtu = new_mtu; | |
719 | return 0; | |
720 | } | |
721 | ||
722 | static void veth_set_multicast_list(struct net_device *dev) | |
723 | { | |
724 | struct veth_port *port = (struct veth_port *) dev->priv; | |
725 | unsigned long flags; | |
726 | ||
727 | write_lock_irqsave(&port->mcast_gate, flags); | |
728 | ||
729 | if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */ | |
730 | printk(KERN_INFO "%s: Promiscuous mode enabled.\n", | |
731 | dev->name); | |
732 | port->promiscuous = 1; | |
733 | } else if ( (dev->flags & IFF_ALLMULTI) | |
734 | || (dev->mc_count > VETH_MAX_MCAST) ) { | |
735 | port->all_mcast = 1; | |
736 | } else { | |
737 | struct dev_mc_list *dmi = dev->mc_list; | |
738 | int i; | |
739 | ||
740 | /* Update table */ | |
741 | port->num_mcast = 0; | |
742 | ||
743 | for (i = 0; i < dev->mc_count; i++) { | |
744 | u8 *addr = dmi->dmi_addr; | |
745 | u64 xaddr = 0; | |
746 | ||
747 | if (addr[0] & 0x01) {/* multicast address? */ | |
748 | memcpy(&xaddr, addr, ETH_ALEN); | |
749 | port->mcast_addr[port->num_mcast] = xaddr; | |
750 | port->num_mcast++; | |
751 | } | |
752 | dmi = dmi->next; | |
753 | } | |
754 | } | |
755 | ||
756 | write_unlock_irqrestore(&port->mcast_gate, flags); | |
757 | } | |
758 | ||
759 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
760 | { | |
761 | strncpy(info->driver, "veth", sizeof(info->driver) - 1); | |
762 | info->driver[sizeof(info->driver) - 1] = '\0'; | |
763 | strncpy(info->version, "1.0", sizeof(info->version) - 1); | |
764 | } | |
765 | ||
766 | static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd) | |
767 | { | |
768 | ecmd->supported = (SUPPORTED_1000baseT_Full | |
769 | | SUPPORTED_Autoneg | SUPPORTED_FIBRE); | |
770 | ecmd->advertising = (SUPPORTED_1000baseT_Full | |
771 | | SUPPORTED_Autoneg | SUPPORTED_FIBRE); | |
772 | ecmd->port = PORT_FIBRE; | |
773 | ecmd->transceiver = XCVR_INTERNAL; | |
774 | ecmd->phy_address = 0; | |
775 | ecmd->speed = SPEED_1000; | |
776 | ecmd->duplex = DUPLEX_FULL; | |
777 | ecmd->autoneg = AUTONEG_ENABLE; | |
778 | ecmd->maxtxpkt = 120; | |
779 | ecmd->maxrxpkt = 120; | |
780 | return 0; | |
781 | } | |
782 | ||
783 | static u32 veth_get_link(struct net_device *dev) | |
784 | { | |
785 | return 1; | |
786 | } | |
787 | ||
788 | static struct ethtool_ops ops = { | |
789 | .get_drvinfo = veth_get_drvinfo, | |
790 | .get_settings = veth_get_settings, | |
791 | .get_link = veth_get_link, | |
792 | }; | |
793 | ||
794 | static void veth_tx_timeout(struct net_device *dev) | |
795 | { | |
796 | struct veth_port *port = (struct veth_port *)dev->priv; | |
797 | struct net_device_stats *stats = &port->stats; | |
798 | unsigned long flags; | |
799 | int i; | |
800 | ||
801 | stats->tx_errors++; | |
802 | ||
803 | spin_lock_irqsave(&port->pending_gate, flags); | |
804 | ||
243cd55e ME |
805 | if (!port->pending_lpmask) { |
806 | spin_unlock_irqrestore(&port->pending_gate, flags); | |
807 | return; | |
808 | } | |
809 | ||
1da177e4 LT |
810 | printk(KERN_WARNING "%s: Tx timeout! Resetting lp connections: %08x\n", |
811 | dev->name, port->pending_lpmask); | |
812 | ||
1da177e4 LT |
813 | for (i = 0; i < HVMAXARCHITECTEDLPS; i++) { |
814 | struct veth_lpar_connection *cnx = veth_cnx[i]; | |
815 | ||
816 | if (! (port->pending_lpmask & (1<<i))) | |
817 | continue; | |
818 | ||
819 | /* If we're pending on it, we must be connected to it, | |
820 | * so we should certainly have a structure for it. */ | |
821 | BUG_ON(! cnx); | |
822 | ||
823 | /* Theoretically we could be kicking a connection | |
824 | * which doesn't deserve it, but in practice if we've | |
825 | * had a Tx timeout, the pending_lpmask will have | |
826 | * exactly one bit set - the connection causing the | |
827 | * problem. */ | |
828 | spin_lock(&cnx->lock); | |
829 | cnx->state |= VETH_STATE_RESET; | |
830 | veth_kick_statemachine(cnx); | |
831 | spin_unlock(&cnx->lock); | |
832 | } | |
833 | ||
834 | spin_unlock_irqrestore(&port->pending_gate, flags); | |
835 | } | |
836 | ||
837 | static struct net_device * __init veth_probe_one(int vlan, struct device *vdev) | |
838 | { | |
839 | struct net_device *dev; | |
840 | struct veth_port *port; | |
841 | int i, rc; | |
842 | ||
843 | dev = alloc_etherdev(sizeof (struct veth_port)); | |
844 | if (! dev) { | |
845 | veth_error("Unable to allocate net_device structure!\n"); | |
846 | return NULL; | |
847 | } | |
848 | ||
849 | port = (struct veth_port *) dev->priv; | |
850 | ||
851 | spin_lock_init(&port->pending_gate); | |
852 | rwlock_init(&port->mcast_gate); | |
853 | ||
854 | for (i = 0; i < HVMAXARCHITECTEDLPS; i++) { | |
855 | HvLpVirtualLanIndexMap map; | |
856 | ||
857 | if (i == this_lp) | |
858 | continue; | |
859 | map = HvLpConfig_getVirtualLanIndexMapForLp(i); | |
860 | if (map & (0x8000 >> vlan)) | |
861 | port->lpar_map |= (1 << i); | |
862 | } | |
863 | port->dev = vdev; | |
864 | ||
865 | dev->dev_addr[0] = 0x02; | |
866 | dev->dev_addr[1] = 0x01; | |
867 | dev->dev_addr[2] = 0xff; | |
868 | dev->dev_addr[3] = vlan; | |
869 | dev->dev_addr[4] = 0xff; | |
870 | dev->dev_addr[5] = this_lp; | |
871 | ||
872 | dev->mtu = VETH_MAX_MTU; | |
873 | ||
874 | memcpy(&port->mac_addr, dev->dev_addr, 6); | |
875 | ||
876 | dev->open = veth_open; | |
877 | dev->hard_start_xmit = veth_start_xmit; | |
878 | dev->stop = veth_close; | |
879 | dev->get_stats = veth_get_stats; | |
880 | dev->change_mtu = veth_change_mtu; | |
881 | dev->set_mac_address = NULL; | |
882 | dev->set_multicast_list = veth_set_multicast_list; | |
883 | SET_ETHTOOL_OPS(dev, &ops); | |
884 | ||
885 | dev->watchdog_timeo = 2 * (VETH_ACKTIMEOUT * HZ / 1000000); | |
886 | dev->tx_timeout = veth_tx_timeout; | |
887 | ||
888 | SET_NETDEV_DEV(dev, vdev); | |
889 | ||
890 | rc = register_netdev(dev); | |
891 | if (rc != 0) { | |
892 | veth_printk(KERN_ERR, | |
893 | "Failed to register ethernet device for vlan %d\n", | |
894 | vlan); | |
895 | free_netdev(dev); | |
896 | return NULL; | |
897 | } | |
898 | ||
899 | veth_printk(KERN_DEBUG, "%s attached to iSeries vlan %d (lpar_map=0x%04x)\n", | |
900 | dev->name, vlan, port->lpar_map); | |
901 | ||
902 | return dev; | |
903 | } | |
904 | ||
905 | /* | |
906 | * Tx path | |
907 | */ | |
908 | ||
909 | static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp, | |
910 | struct net_device *dev) | |
911 | { | |
912 | struct veth_lpar_connection *cnx = veth_cnx[rlp]; | |
913 | struct veth_port *port = (struct veth_port *) dev->priv; | |
914 | HvLpEvent_Rc rc; | |
915 | u32 dma_address, dma_length; | |
916 | struct veth_msg *msg = NULL; | |
917 | int err = 0; | |
918 | unsigned long flags; | |
919 | ||
920 | if (! cnx) { | |
921 | port->stats.tx_errors++; | |
922 | dev_kfree_skb(skb); | |
923 | return 0; | |
924 | } | |
925 | ||
926 | spin_lock_irqsave(&cnx->lock, flags); | |
927 | ||
f27eff1f | 928 | if (! (cnx->state & VETH_STATE_READY)) |
1da177e4 LT |
929 | goto drop; |
930 | ||
931 | if ((skb->len - 14) > VETH_MAX_MTU) | |
932 | goto drop; | |
933 | ||
934 | msg = veth_stack_pop(cnx); | |
935 | ||
936 | if (! msg) { | |
937 | err = 1; | |
938 | goto drop; | |
939 | } | |
940 | ||
941 | dma_length = skb->len; | |
942 | dma_address = dma_map_single(port->dev, skb->data, | |
943 | dma_length, DMA_TO_DEVICE); | |
944 | ||
945 | if (dma_mapping_error(dma_address)) | |
946 | goto recycle_and_drop; | |
947 | ||
948 | /* Is it really necessary to check the length and address | |
949 | * fields of the first entry here? */ | |
950 | msg->skb = skb; | |
951 | msg->dev = port->dev; | |
952 | msg->data.addr[0] = dma_address; | |
953 | msg->data.len[0] = dma_length; | |
954 | msg->data.eofmask = 1 << VETH_EOF_SHIFT; | |
955 | set_bit(0, &(msg->in_use)); | |
956 | rc = veth_signaldata(cnx, VethEventTypeFrames, msg->token, &msg->data); | |
957 | ||
958 | if (rc != HvLpEvent_Rc_Good) | |
959 | goto recycle_and_drop; | |
960 | ||
961 | spin_unlock_irqrestore(&cnx->lock, flags); | |
962 | return 0; | |
963 | ||
964 | recycle_and_drop: | |
965 | msg->skb = NULL; | |
966 | /* need to set in use to make veth_recycle_msg in case this | |
967 | * was a mapping failure */ | |
968 | set_bit(0, &msg->in_use); | |
969 | veth_recycle_msg(cnx, msg); | |
970 | drop: | |
971 | port->stats.tx_errors++; | |
972 | dev_kfree_skb(skb); | |
973 | spin_unlock_irqrestore(&cnx->lock, flags); | |
974 | return err; | |
975 | } | |
976 | ||
977 | static HvLpIndexMap veth_transmit_to_many(struct sk_buff *skb, | |
978 | HvLpIndexMap lpmask, | |
979 | struct net_device *dev) | |
980 | { | |
981 | struct veth_port *port = (struct veth_port *) dev->priv; | |
982 | int i; | |
983 | int rc; | |
984 | ||
985 | for (i = 0; i < HVMAXARCHITECTEDLPS; i++) { | |
986 | if ((lpmask & (1 << i)) == 0) | |
987 | continue; | |
988 | ||
989 | rc = veth_transmit_to_one(skb_get(skb), i, dev); | |
990 | if (! rc) | |
991 | lpmask &= ~(1<<i); | |
992 | } | |
993 | ||
994 | if (! lpmask) { | |
995 | port->stats.tx_packets++; | |
996 | port->stats.tx_bytes += skb->len; | |
997 | } | |
998 | ||
999 | return lpmask; | |
1000 | } | |
1001 | ||
1002 | static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
1003 | { | |
1004 | unsigned char *frame = skb->data; | |
1005 | struct veth_port *port = (struct veth_port *) dev->priv; | |
1006 | unsigned long flags; | |
1007 | HvLpIndexMap lpmask; | |
1008 | ||
1009 | if (! (frame[0] & 0x01)) { | |
1010 | /* unicast packet */ | |
1011 | HvLpIndex rlp = frame[5]; | |
1012 | ||
1013 | if ( ! ((1 << rlp) & port->lpar_map) ) { | |
1014 | dev_kfree_skb(skb); | |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | lpmask = 1 << rlp; | |
1019 | } else { | |
1020 | lpmask = port->lpar_map; | |
1021 | } | |
1022 | ||
1023 | spin_lock_irqsave(&port->pending_gate, flags); | |
1024 | ||
1025 | lpmask = veth_transmit_to_many(skb, lpmask, dev); | |
1026 | ||
eb235aef ME |
1027 | dev->trans_start = jiffies; |
1028 | ||
1da177e4 LT |
1029 | if (! lpmask) { |
1030 | dev_kfree_skb(skb); | |
1031 | } else { | |
1032 | if (port->pending_skb) { | |
1033 | veth_error("%s: Tx while skb was pending!\n", | |
1034 | dev->name); | |
1035 | dev_kfree_skb(skb); | |
1036 | spin_unlock_irqrestore(&port->pending_gate, flags); | |
1037 | return 1; | |
1038 | } | |
1039 | ||
1040 | port->pending_skb = skb; | |
1041 | port->pending_lpmask = lpmask; | |
1042 | netif_stop_queue(dev); | |
1043 | } | |
1044 | ||
1045 | spin_unlock_irqrestore(&port->pending_gate, flags); | |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | static void veth_recycle_msg(struct veth_lpar_connection *cnx, | |
1051 | struct veth_msg *msg) | |
1052 | { | |
1053 | u32 dma_address, dma_length; | |
1054 | ||
1055 | if (test_and_clear_bit(0, &msg->in_use)) { | |
1056 | dma_address = msg->data.addr[0]; | |
1057 | dma_length = msg->data.len[0]; | |
1058 | ||
1059 | dma_unmap_single(msg->dev, dma_address, dma_length, | |
1060 | DMA_TO_DEVICE); | |
1061 | ||
1062 | if (msg->skb) { | |
1063 | dev_kfree_skb_any(msg->skb); | |
1064 | msg->skb = NULL; | |
1065 | } | |
1066 | ||
1067 | memset(&msg->data, 0, sizeof(msg->data)); | |
1068 | veth_stack_push(cnx, msg); | |
1069 | } else | |
1070 | if (cnx->state & VETH_STATE_OPEN) | |
1071 | veth_error("Bogus frames ack from lpar %d (#%d)\n", | |
1072 | cnx->remote_lp, msg->token); | |
1073 | } | |
1074 | ||
1075 | static void veth_flush_pending(struct veth_lpar_connection *cnx) | |
1076 | { | |
1077 | int i; | |
1078 | for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) { | |
1079 | struct net_device *dev = veth_dev[i]; | |
1080 | struct veth_port *port; | |
1081 | unsigned long flags; | |
1082 | ||
1083 | if (! dev) | |
1084 | continue; | |
1085 | ||
1086 | port = (struct veth_port *)dev->priv; | |
1087 | ||
1088 | if (! (port->lpar_map & (1<<cnx->remote_lp))) | |
1089 | continue; | |
1090 | ||
1091 | spin_lock_irqsave(&port->pending_gate, flags); | |
1092 | if (port->pending_skb) { | |
1093 | port->pending_lpmask = | |
1094 | veth_transmit_to_many(port->pending_skb, | |
1095 | port->pending_lpmask, | |
1096 | dev); | |
1097 | if (! port->pending_lpmask) { | |
1098 | dev_kfree_skb_any(port->pending_skb); | |
1099 | port->pending_skb = NULL; | |
1100 | netif_wake_queue(dev); | |
1101 | } | |
1102 | } | |
1103 | spin_unlock_irqrestore(&port->pending_gate, flags); | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * Rx path | |
1109 | */ | |
1110 | ||
1111 | static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr) | |
1112 | { | |
1113 | int wanted = 0; | |
1114 | int i; | |
1115 | unsigned long flags; | |
1116 | ||
1117 | if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) ) | |
1118 | return 1; | |
1119 | ||
1120 | if (! (((char *) &mac_addr)[0] & 0x01)) | |
1121 | return 0; | |
1122 | ||
1123 | read_lock_irqsave(&port->mcast_gate, flags); | |
1124 | ||
1125 | if (port->promiscuous || port->all_mcast) { | |
1126 | wanted = 1; | |
1127 | goto out; | |
1128 | } | |
1129 | ||
1130 | for (i = 0; i < port->num_mcast; ++i) { | |
1131 | if (port->mcast_addr[i] == mac_addr) { | |
1132 | wanted = 1; | |
1133 | break; | |
1134 | } | |
1135 | } | |
1136 | ||
1137 | out: | |
1138 | read_unlock_irqrestore(&port->mcast_gate, flags); | |
1139 | ||
1140 | return wanted; | |
1141 | } | |
1142 | ||
1143 | struct dma_chunk { | |
1144 | u64 addr; | |
1145 | u64 size; | |
1146 | }; | |
1147 | ||
1148 | #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 ) | |
1149 | ||
1150 | static inline void veth_build_dma_list(struct dma_chunk *list, | |
1151 | unsigned char *p, unsigned long length) | |
1152 | { | |
1153 | unsigned long done; | |
1154 | int i = 1; | |
1155 | ||
1156 | /* FIXME: skbs are continguous in real addresses. Do we | |
1157 | * really need to break it into PAGE_SIZE chunks, or can we do | |
1158 | * it just at the granularity of iSeries real->absolute | |
1159 | * mapping? Indeed, given the way the allocator works, can we | |
1160 | * count on them being absolutely contiguous? */ | |
1161 | list[0].addr = ISERIES_HV_ADDR(p); | |
1162 | list[0].size = min(length, | |
1163 | PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK)); | |
1164 | ||
1165 | done = list[0].size; | |
1166 | while (done < length) { | |
1167 | list[i].addr = ISERIES_HV_ADDR(p + done); | |
1168 | list[i].size = min(length-done, PAGE_SIZE); | |
1169 | done += list[i].size; | |
1170 | i++; | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | static void veth_flush_acks(struct veth_lpar_connection *cnx) | |
1175 | { | |
1176 | HvLpEvent_Rc rc; | |
1177 | ||
1178 | rc = veth_signaldata(cnx, VethEventTypeFramesAck, | |
1179 | 0, &cnx->pending_acks); | |
1180 | ||
1181 | if (rc != HvLpEvent_Rc_Good) | |
1182 | veth_error("Error 0x%x acking frames from lpar %d!\n", | |
1183 | (unsigned)rc, cnx->remote_lp); | |
1184 | ||
1185 | cnx->num_pending_acks = 0; | |
1186 | memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks)); | |
1187 | } | |
1188 | ||
1189 | static void veth_receive(struct veth_lpar_connection *cnx, | |
1190 | struct VethLpEvent *event) | |
1191 | { | |
1192 | struct VethFramesData *senddata = &event->u.frames_data; | |
1193 | int startchunk = 0; | |
1194 | int nchunks; | |
1195 | unsigned long flags; | |
1196 | HvLpDma_Rc rc; | |
1197 | ||
1198 | do { | |
1199 | u16 length = 0; | |
1200 | struct sk_buff *skb; | |
1201 | struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME]; | |
1202 | struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG]; | |
1203 | u64 dest; | |
1204 | HvLpVirtualLanIndex vlan; | |
1205 | struct net_device *dev; | |
1206 | struct veth_port *port; | |
1207 | ||
1208 | /* FIXME: do we need this? */ | |
1209 | memset(local_list, 0, sizeof(local_list)); | |
1210 | memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG)); | |
1211 | ||
1212 | /* a 0 address marks the end of the valid entries */ | |
1213 | if (senddata->addr[startchunk] == 0) | |
1214 | break; | |
1215 | ||
1216 | /* make sure that we have at least 1 EOF entry in the | |
1217 | * remaining entries */ | |
1218 | if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) { | |
1219 | veth_error("missing EOF frag in event " | |
1220 | "eofmask=0x%x startchunk=%d\n", | |
1221 | (unsigned) senddata->eofmask, startchunk); | |
1222 | break; | |
1223 | } | |
1224 | ||
1225 | /* build list of chunks in this frame */ | |
1226 | nchunks = 0; | |
1227 | do { | |
1228 | remote_list[nchunks].addr = | |
1229 | (u64) senddata->addr[startchunk+nchunks] << 32; | |
1230 | remote_list[nchunks].size = | |
1231 | senddata->len[startchunk+nchunks]; | |
1232 | length += remote_list[nchunks].size; | |
1233 | } while (! (senddata->eofmask & | |
1234 | (1 << (VETH_EOF_SHIFT + startchunk + nchunks++)))); | |
1235 | ||
1236 | /* length == total length of all chunks */ | |
1237 | /* nchunks == # of chunks in this frame */ | |
1238 | ||
1239 | if ((length - ETH_HLEN) > VETH_MAX_MTU) { | |
1240 | veth_error("Received oversize frame from lpar %d " | |
1241 | "(length=%d)\n", cnx->remote_lp, length); | |
1242 | continue; | |
1243 | } | |
1244 | ||
1245 | skb = alloc_skb(length, GFP_ATOMIC); | |
1246 | if (!skb) | |
1247 | continue; | |
1248 | ||
1249 | veth_build_dma_list(local_list, skb->data, length); | |
1250 | ||
1251 | rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan, | |
1252 | event->base_event.xSourceLp, | |
1253 | HvLpDma_Direction_RemoteToLocal, | |
1254 | cnx->src_inst, | |
1255 | cnx->dst_inst, | |
1256 | HvLpDma_AddressType_RealAddress, | |
1257 | HvLpDma_AddressType_TceIndex, | |
1258 | ISERIES_HV_ADDR(&local_list), | |
1259 | ISERIES_HV_ADDR(&remote_list), | |
1260 | length); | |
1261 | if (rc != HvLpDma_Rc_Good) { | |
1262 | dev_kfree_skb_irq(skb); | |
1263 | continue; | |
1264 | } | |
1265 | ||
1266 | vlan = skb->data[9]; | |
1267 | dev = veth_dev[vlan]; | |
41664c03 ME |
1268 | if (! dev) { |
1269 | /* | |
1270 | * Some earlier versions of the driver sent | |
1271 | * broadcasts down all connections, even to lpars | |
1272 | * that weren't on the relevant vlan. So ignore | |
1273 | * packets belonging to a vlan we're not on. | |
1274 | * We can also be here if we receive packets while | |
1275 | * the driver is going down, because then dev is NULL. | |
1276 | */ | |
1277 | dev_kfree_skb_irq(skb); | |
1da177e4 | 1278 | continue; |
41664c03 | 1279 | } |
1da177e4 LT |
1280 | |
1281 | port = (struct veth_port *)dev->priv; | |
1282 | dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000; | |
1283 | ||
1284 | if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) { | |
1285 | dev_kfree_skb_irq(skb); | |
1286 | continue; | |
1287 | } | |
1288 | if (! veth_frame_wanted(port, dest)) { | |
1289 | dev_kfree_skb_irq(skb); | |
1290 | continue; | |
1291 | } | |
1292 | ||
1293 | skb_put(skb, length); | |
1294 | skb->dev = dev; | |
1295 | skb->protocol = eth_type_trans(skb, dev); | |
1296 | skb->ip_summed = CHECKSUM_NONE; | |
1297 | netif_rx(skb); /* send it up */ | |
1298 | port->stats.rx_packets++; | |
1299 | port->stats.rx_bytes += length; | |
1300 | } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG); | |
1301 | ||
1302 | /* Ack it */ | |
1303 | spin_lock_irqsave(&cnx->lock, flags); | |
1304 | BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG); | |
1305 | ||
1306 | cnx->pending_acks[cnx->num_pending_acks++] = | |
1307 | event->base_event.xCorrelationToken; | |
1308 | ||
1309 | if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold) | |
1310 | || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) ) | |
1311 | veth_flush_acks(cnx); | |
1312 | ||
1313 | spin_unlock_irqrestore(&cnx->lock, flags); | |
1314 | } | |
1315 | ||
1316 | static void veth_timed_ack(unsigned long ptr) | |
1317 | { | |
1318 | struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr; | |
1319 | unsigned long flags; | |
1320 | ||
1321 | /* Ack all the events */ | |
1322 | spin_lock_irqsave(&cnx->lock, flags); | |
1323 | if (cnx->num_pending_acks > 0) | |
1324 | veth_flush_acks(cnx); | |
1325 | ||
1326 | /* Reschedule the timer */ | |
1327 | cnx->ack_timer.expires = jiffies + cnx->ack_timeout; | |
1328 | add_timer(&cnx->ack_timer); | |
1329 | spin_unlock_irqrestore(&cnx->lock, flags); | |
1330 | } | |
1331 | ||
1332 | static int veth_remove(struct vio_dev *vdev) | |
1333 | { | |
1334 | int i = vdev->unit_address; | |
1335 | struct net_device *dev; | |
1336 | ||
1337 | dev = veth_dev[i]; | |
1338 | if (dev != NULL) { | |
1339 | veth_dev[i] = NULL; | |
1340 | unregister_netdev(dev); | |
1341 | free_netdev(dev); | |
1342 | } | |
1343 | return 0; | |
1344 | } | |
1345 | ||
1346 | static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
1347 | { | |
1348 | int i = vdev->unit_address; | |
1349 | struct net_device *dev; | |
1350 | ||
1351 | dev = veth_probe_one(i, &vdev->dev); | |
1352 | if (dev == NULL) { | |
1353 | veth_remove(vdev); | |
1354 | return 1; | |
1355 | } | |
1356 | veth_dev[i] = dev; | |
1357 | ||
1358 | /* Start the state machine on each connection, to commence | |
1359 | * link negotiation */ | |
1360 | for (i = 0; i < HVMAXARCHITECTEDLPS; i++) | |
1361 | if (veth_cnx[i]) | |
1362 | veth_kick_statemachine(veth_cnx[i]); | |
1363 | ||
1364 | return 0; | |
1365 | } | |
1366 | ||
1367 | /** | |
1368 | * veth_device_table: Used by vio.c to match devices that we | |
1369 | * support. | |
1370 | */ | |
1371 | static struct vio_device_id veth_device_table[] __devinitdata = { | |
1372 | { "vlan", "" }, | |
1373 | { NULL, NULL } | |
1374 | }; | |
1375 | MODULE_DEVICE_TABLE(vio, veth_device_table); | |
1376 | ||
1377 | static struct vio_driver veth_driver = { | |
1378 | .name = "iseries_veth", | |
1379 | .id_table = veth_device_table, | |
1380 | .probe = veth_probe, | |
1381 | .remove = veth_remove | |
1382 | }; | |
1383 | ||
1384 | /* | |
1385 | * Module initialization/cleanup | |
1386 | */ | |
1387 | ||
1388 | void __exit veth_module_cleanup(void) | |
1389 | { | |
1390 | int i; | |
1391 | ||
b2e0852e ME |
1392 | /* Stop the queues first to stop any new packets being sent. */ |
1393 | for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) | |
1394 | if (veth_dev[i]) | |
1395 | netif_stop_queue(veth_dev[i]); | |
1da177e4 | 1396 | |
b2e0852e ME |
1397 | /* Stop the connections before we unregister the driver. This |
1398 | * ensures there's no skbs lying around holding the device open. */ | |
1da177e4 LT |
1399 | for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) |
1400 | veth_stop_connection(i); | |
1401 | ||
1402 | HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan); | |
1403 | ||
1404 | /* Hypervisor callbacks may have scheduled more work while we | |
b2e0852e | 1405 | * were stoping connections. Now that we've disconnected from |
1da177e4 LT |
1406 | * the hypervisor make sure everything's finished. */ |
1407 | flush_scheduled_work(); | |
1408 | ||
b2e0852e ME |
1409 | vio_unregister_driver(&veth_driver); |
1410 | ||
1da177e4 LT |
1411 | for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) |
1412 | veth_destroy_connection(i); | |
1413 | ||
1414 | } | |
1415 | module_exit(veth_module_cleanup); | |
1416 | ||
1417 | int __init veth_module_init(void) | |
1418 | { | |
1419 | int i; | |
1420 | int rc; | |
1421 | ||
1422 | this_lp = HvLpConfig_getLpIndex_outline(); | |
1423 | ||
1424 | for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) { | |
1425 | rc = veth_init_connection(i); | |
1426 | if (rc != 0) { | |
1427 | veth_module_cleanup(); | |
1428 | return rc; | |
1429 | } | |
1430 | } | |
1431 | ||
1432 | HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan, | |
1433 | &veth_handle_event); | |
1434 | ||
1435 | return vio_register_driver(&veth_driver); | |
1436 | } | |
1437 | module_init(veth_module_init); |