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4c521e42 DM |
1 | /* sunvnet.c: Sun LDOM Virtual Network Driver. |
2 | * | |
3d452e55 | 3 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
4c521e42 DM |
4 | */ |
5 | ||
4d5870ec JP |
6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
7 | ||
4c521e42 DM |
8 | #include <linux/module.h> |
9 | #include <linux/kernel.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/netdevice.h> | |
15 | #include <linux/ethtool.h> | |
16 | #include <linux/etherdevice.h> | |
9184a046 | 17 | #include <linux/mutex.h> |
4c521e42 DM |
18 | |
19 | #include <asm/vio.h> | |
20 | #include <asm/ldc.h> | |
21 | ||
22 | #include "sunvnet.h" | |
23 | ||
24 | #define DRV_MODULE_NAME "sunvnet" | |
4c521e42 DM |
25 | #define DRV_MODULE_VERSION "1.0" |
26 | #define DRV_MODULE_RELDATE "June 25, 2007" | |
27 | ||
f73d12bd | 28 | static char version[] = |
4c521e42 DM |
29 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; |
30 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); | |
31 | MODULE_DESCRIPTION("Sun LDOM virtual network driver"); | |
32 | MODULE_LICENSE("GPL"); | |
33 | MODULE_VERSION(DRV_MODULE_VERSION); | |
34 | ||
35 | /* Ordered from largest major to lowest */ | |
36 | static struct vio_version vnet_versions[] = { | |
37 | { .major = 1, .minor = 0 }, | |
38 | }; | |
39 | ||
40 | static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr) | |
41 | { | |
42 | return vio_dring_avail(dr, VNET_TX_RING_SIZE); | |
43 | } | |
44 | ||
45 | static int vnet_handle_unknown(struct vnet_port *port, void *arg) | |
46 | { | |
47 | struct vio_msg_tag *pkt = arg; | |
48 | ||
4d5870ec | 49 | pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n", |
4c521e42 | 50 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); |
4d5870ec | 51 | pr_err("Resetting connection\n"); |
4c521e42 DM |
52 | |
53 | ldc_disconnect(port->vio.lp); | |
54 | ||
55 | return -ECONNRESET; | |
56 | } | |
57 | ||
58 | static int vnet_send_attr(struct vio_driver_state *vio) | |
59 | { | |
60 | struct vnet_port *port = to_vnet_port(vio); | |
61 | struct net_device *dev = port->vp->dev; | |
62 | struct vio_net_attr_info pkt; | |
63 | int i; | |
64 | ||
65 | memset(&pkt, 0, sizeof(pkt)); | |
66 | pkt.tag.type = VIO_TYPE_CTRL; | |
67 | pkt.tag.stype = VIO_SUBTYPE_INFO; | |
68 | pkt.tag.stype_env = VIO_ATTR_INFO; | |
69 | pkt.tag.sid = vio_send_sid(vio); | |
70 | pkt.xfer_mode = VIO_DRING_MODE; | |
71 | pkt.addr_type = VNET_ADDR_ETHERMAC; | |
72 | pkt.ack_freq = 0; | |
73 | for (i = 0; i < 6; i++) | |
74 | pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8); | |
75 | pkt.mtu = ETH_FRAME_LEN; | |
76 | ||
77 | viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " | |
78 | "ackfreq[%u] mtu[%llu]\n", | |
79 | pkt.xfer_mode, pkt.addr_type, | |
80 | (unsigned long long) pkt.addr, | |
81 | pkt.ack_freq, | |
82 | (unsigned long long) pkt.mtu); | |
83 | ||
84 | return vio_ldc_send(vio, &pkt, sizeof(pkt)); | |
85 | } | |
86 | ||
87 | static int handle_attr_info(struct vio_driver_state *vio, | |
88 | struct vio_net_attr_info *pkt) | |
89 | { | |
90 | viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] " | |
91 | "ackfreq[%u] mtu[%llu]\n", | |
92 | pkt->xfer_mode, pkt->addr_type, | |
93 | (unsigned long long) pkt->addr, | |
94 | pkt->ack_freq, | |
95 | (unsigned long long) pkt->mtu); | |
96 | ||
97 | pkt->tag.sid = vio_send_sid(vio); | |
98 | ||
99 | if (pkt->xfer_mode != VIO_DRING_MODE || | |
100 | pkt->addr_type != VNET_ADDR_ETHERMAC || | |
101 | pkt->mtu != ETH_FRAME_LEN) { | |
102 | viodbg(HS, "SEND NET ATTR NACK\n"); | |
103 | ||
104 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
105 | ||
106 | (void) vio_ldc_send(vio, pkt, sizeof(*pkt)); | |
107 | ||
108 | return -ECONNRESET; | |
109 | } else { | |
110 | viodbg(HS, "SEND NET ATTR ACK\n"); | |
111 | ||
112 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
113 | ||
114 | return vio_ldc_send(vio, pkt, sizeof(*pkt)); | |
115 | } | |
116 | ||
117 | } | |
118 | ||
119 | static int handle_attr_ack(struct vio_driver_state *vio, | |
120 | struct vio_net_attr_info *pkt) | |
121 | { | |
122 | viodbg(HS, "GOT NET ATTR ACK\n"); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static int handle_attr_nack(struct vio_driver_state *vio, | |
128 | struct vio_net_attr_info *pkt) | |
129 | { | |
130 | viodbg(HS, "GOT NET ATTR NACK\n"); | |
131 | ||
132 | return -ECONNRESET; | |
133 | } | |
134 | ||
135 | static int vnet_handle_attr(struct vio_driver_state *vio, void *arg) | |
136 | { | |
137 | struct vio_net_attr_info *pkt = arg; | |
138 | ||
139 | switch (pkt->tag.stype) { | |
140 | case VIO_SUBTYPE_INFO: | |
141 | return handle_attr_info(vio, pkt); | |
142 | ||
143 | case VIO_SUBTYPE_ACK: | |
144 | return handle_attr_ack(vio, pkt); | |
145 | ||
146 | case VIO_SUBTYPE_NACK: | |
147 | return handle_attr_nack(vio, pkt); | |
148 | ||
149 | default: | |
150 | return -ECONNRESET; | |
151 | } | |
152 | } | |
153 | ||
154 | static void vnet_handshake_complete(struct vio_driver_state *vio) | |
155 | { | |
156 | struct vio_dring_state *dr; | |
157 | ||
158 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
159 | dr->snd_nxt = dr->rcv_nxt = 1; | |
160 | ||
161 | dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
162 | dr->snd_nxt = dr->rcv_nxt = 1; | |
163 | } | |
164 | ||
165 | /* The hypervisor interface that implements copying to/from imported | |
166 | * memory from another domain requires that copies are done to 8-byte | |
167 | * aligned buffers, and that the lengths of such copies are also 8-byte | |
168 | * multiples. | |
169 | * | |
170 | * So we align skb->data to an 8-byte multiple and pad-out the data | |
171 | * area so we can round the copy length up to the next multiple of | |
172 | * 8 for the copy. | |
173 | * | |
174 | * The transmitter puts the actual start of the packet 6 bytes into | |
175 | * the buffer it sends over, so that the IP headers after the ethernet | |
176 | * header are aligned properly. These 6 bytes are not in the descriptor | |
177 | * length, they are simply implied. This offset is represented using | |
178 | * the VNET_PACKET_SKIP macro. | |
179 | */ | |
180 | static struct sk_buff *alloc_and_align_skb(struct net_device *dev, | |
181 | unsigned int len) | |
182 | { | |
183 | struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8); | |
184 | unsigned long addr, off; | |
185 | ||
186 | if (unlikely(!skb)) | |
187 | return NULL; | |
188 | ||
189 | addr = (unsigned long) skb->data; | |
190 | off = ((addr + 7UL) & ~7UL) - addr; | |
191 | if (off) | |
192 | skb_reserve(skb, off); | |
193 | ||
194 | return skb; | |
195 | } | |
196 | ||
197 | static int vnet_rx_one(struct vnet_port *port, unsigned int len, | |
198 | struct ldc_trans_cookie *cookies, int ncookies) | |
199 | { | |
200 | struct net_device *dev = port->vp->dev; | |
201 | unsigned int copy_len; | |
202 | struct sk_buff *skb; | |
203 | int err; | |
204 | ||
205 | err = -EMSGSIZE; | |
206 | if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) { | |
207 | dev->stats.rx_length_errors++; | |
208 | goto out_dropped; | |
209 | } | |
210 | ||
211 | skb = alloc_and_align_skb(dev, len); | |
212 | err = -ENOMEM; | |
213 | if (unlikely(!skb)) { | |
214 | dev->stats.rx_missed_errors++; | |
215 | goto out_dropped; | |
216 | } | |
217 | ||
218 | copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U; | |
219 | skb_put(skb, copy_len); | |
220 | err = ldc_copy(port->vio.lp, LDC_COPY_IN, | |
221 | skb->data, copy_len, 0, | |
222 | cookies, ncookies); | |
223 | if (unlikely(err < 0)) { | |
224 | dev->stats.rx_frame_errors++; | |
225 | goto out_free_skb; | |
226 | } | |
227 | ||
228 | skb_pull(skb, VNET_PACKET_SKIP); | |
229 | skb_trim(skb, len); | |
230 | skb->protocol = eth_type_trans(skb, dev); | |
231 | ||
232 | dev->stats.rx_packets++; | |
233 | dev->stats.rx_bytes += len; | |
234 | ||
235 | netif_rx(skb); | |
236 | ||
237 | return 0; | |
238 | ||
239 | out_free_skb: | |
240 | kfree_skb(skb); | |
241 | ||
242 | out_dropped: | |
243 | dev->stats.rx_dropped++; | |
244 | return err; | |
245 | } | |
246 | ||
247 | static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr, | |
248 | u32 start, u32 end, u8 vio_dring_state) | |
249 | { | |
250 | struct vio_dring_data hdr = { | |
251 | .tag = { | |
252 | .type = VIO_TYPE_DATA, | |
253 | .stype = VIO_SUBTYPE_ACK, | |
254 | .stype_env = VIO_DRING_DATA, | |
255 | .sid = vio_send_sid(&port->vio), | |
256 | }, | |
257 | .dring_ident = dr->ident, | |
258 | .start_idx = start, | |
259 | .end_idx = end, | |
260 | .state = vio_dring_state, | |
261 | }; | |
262 | int err, delay; | |
263 | ||
264 | hdr.seq = dr->snd_nxt; | |
265 | delay = 1; | |
266 | do { | |
267 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); | |
268 | if (err > 0) { | |
269 | dr->snd_nxt++; | |
270 | break; | |
271 | } | |
272 | udelay(delay); | |
273 | if ((delay <<= 1) > 128) | |
274 | delay = 128; | |
275 | } while (err == -EAGAIN); | |
276 | ||
277 | return err; | |
278 | } | |
279 | ||
280 | static u32 next_idx(u32 idx, struct vio_dring_state *dr) | |
281 | { | |
282 | if (++idx == dr->num_entries) | |
283 | idx = 0; | |
284 | return idx; | |
285 | } | |
286 | ||
287 | static u32 prev_idx(u32 idx, struct vio_dring_state *dr) | |
288 | { | |
289 | if (idx == 0) | |
290 | idx = dr->num_entries - 1; | |
291 | else | |
292 | idx--; | |
293 | ||
294 | return idx; | |
295 | } | |
296 | ||
297 | static struct vio_net_desc *get_rx_desc(struct vnet_port *port, | |
298 | struct vio_dring_state *dr, | |
299 | u32 index) | |
300 | { | |
301 | struct vio_net_desc *desc = port->vio.desc_buf; | |
302 | int err; | |
303 | ||
304 | err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size, | |
305 | (index * dr->entry_size), | |
306 | dr->cookies, dr->ncookies); | |
307 | if (err < 0) | |
308 | return ERR_PTR(err); | |
309 | ||
310 | return desc; | |
311 | } | |
312 | ||
313 | static int put_rx_desc(struct vnet_port *port, | |
314 | struct vio_dring_state *dr, | |
315 | struct vio_net_desc *desc, | |
316 | u32 index) | |
317 | { | |
318 | int err; | |
319 | ||
320 | err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size, | |
321 | (index * dr->entry_size), | |
322 | dr->cookies, dr->ncookies); | |
323 | if (err < 0) | |
324 | return err; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | static int vnet_walk_rx_one(struct vnet_port *port, | |
330 | struct vio_dring_state *dr, | |
331 | u32 index, int *needs_ack) | |
332 | { | |
333 | struct vio_net_desc *desc = get_rx_desc(port, dr, index); | |
334 | struct vio_driver_state *vio = &port->vio; | |
335 | int err; | |
336 | ||
337 | if (IS_ERR(desc)) | |
338 | return PTR_ERR(desc); | |
339 | ||
3f4528d6 | 340 | viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n", |
4c521e42 DM |
341 | desc->hdr.state, desc->hdr.ack, |
342 | desc->size, desc->ncookies, | |
343 | desc->cookies[0].cookie_addr, | |
344 | desc->cookies[0].cookie_size); | |
345 | ||
346 | if (desc->hdr.state != VIO_DESC_READY) | |
347 | return 1; | |
348 | err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies); | |
349 | if (err == -ECONNRESET) | |
350 | return err; | |
351 | desc->hdr.state = VIO_DESC_DONE; | |
352 | err = put_rx_desc(port, dr, desc, index); | |
353 | if (err < 0) | |
354 | return err; | |
355 | *needs_ack = desc->hdr.ack; | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, | |
360 | u32 start, u32 end) | |
361 | { | |
362 | struct vio_driver_state *vio = &port->vio; | |
363 | int ack_start = -1, ack_end = -1; | |
364 | ||
365 | end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr); | |
366 | ||
367 | viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end); | |
368 | ||
369 | while (start != end) { | |
370 | int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack); | |
371 | if (err == -ECONNRESET) | |
372 | return err; | |
373 | if (err != 0) | |
374 | break; | |
375 | if (ack_start == -1) | |
376 | ack_start = start; | |
377 | ack_end = start; | |
378 | start = next_idx(start, dr); | |
379 | if (ack && start != end) { | |
380 | err = vnet_send_ack(port, dr, ack_start, ack_end, | |
381 | VIO_DRING_ACTIVE); | |
382 | if (err == -ECONNRESET) | |
383 | return err; | |
384 | ack_start = -1; | |
385 | } | |
386 | } | |
387 | if (unlikely(ack_start == -1)) | |
388 | ack_start = ack_end = prev_idx(start, dr); | |
389 | return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED); | |
390 | } | |
391 | ||
392 | static int vnet_rx(struct vnet_port *port, void *msgbuf) | |
393 | { | |
394 | struct vio_dring_data *pkt = msgbuf; | |
395 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING]; | |
396 | struct vio_driver_state *vio = &port->vio; | |
397 | ||
3f4528d6 | 398 | viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n", |
4c521e42 DM |
399 | pkt->tag.stype_env, pkt->seq, dr->rcv_nxt); |
400 | ||
401 | if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) | |
402 | return 0; | |
403 | if (unlikely(pkt->seq != dr->rcv_nxt)) { | |
4d5870ec JP |
404 | pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n", |
405 | pkt->seq, dr->rcv_nxt); | |
4c521e42 DM |
406 | return 0; |
407 | } | |
408 | ||
409 | dr->rcv_nxt++; | |
410 | ||
411 | /* XXX Validate pkt->start_idx and pkt->end_idx XXX */ | |
412 | ||
413 | return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx); | |
414 | } | |
415 | ||
416 | static int idx_is_pending(struct vio_dring_state *dr, u32 end) | |
417 | { | |
418 | u32 idx = dr->cons; | |
419 | int found = 0; | |
420 | ||
421 | while (idx != dr->prod) { | |
422 | if (idx == end) { | |
423 | found = 1; | |
424 | break; | |
425 | } | |
426 | idx = next_idx(idx, dr); | |
427 | } | |
428 | return found; | |
429 | } | |
430 | ||
431 | static int vnet_ack(struct vnet_port *port, void *msgbuf) | |
432 | { | |
433 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
434 | struct vio_dring_data *pkt = msgbuf; | |
435 | struct net_device *dev; | |
436 | struct vnet *vp; | |
437 | u32 end; | |
438 | ||
439 | if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) | |
440 | return 0; | |
441 | ||
442 | end = pkt->end_idx; | |
443 | if (unlikely(!idx_is_pending(dr, end))) | |
444 | return 0; | |
445 | ||
446 | dr->cons = next_idx(end, dr); | |
447 | ||
448 | vp = port->vp; | |
449 | dev = vp->dev; | |
450 | if (unlikely(netif_queue_stopped(dev) && | |
451 | vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr))) | |
452 | return 1; | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | static int vnet_nack(struct vnet_port *port, void *msgbuf) | |
458 | { | |
459 | /* XXX just reset or similar XXX */ | |
460 | return 0; | |
461 | } | |
462 | ||
028ebff2 DM |
463 | static int handle_mcast(struct vnet_port *port, void *msgbuf) |
464 | { | |
465 | struct vio_net_mcast_info *pkt = msgbuf; | |
466 | ||
467 | if (pkt->tag.stype != VIO_SUBTYPE_ACK) | |
4d5870ec | 468 | pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n", |
028ebff2 DM |
469 | port->vp->dev->name, |
470 | pkt->tag.type, | |
471 | pkt->tag.stype, | |
472 | pkt->tag.stype_env, | |
473 | pkt->tag.sid); | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
4c521e42 DM |
478 | static void maybe_tx_wakeup(struct vnet *vp) |
479 | { | |
480 | struct net_device *dev = vp->dev; | |
481 | ||
482 | netif_tx_lock(dev); | |
483 | if (likely(netif_queue_stopped(dev))) { | |
484 | struct vnet_port *port; | |
485 | int wake = 1; | |
486 | ||
487 | list_for_each_entry(port, &vp->port_list, list) { | |
488 | struct vio_dring_state *dr; | |
489 | ||
490 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
491 | if (vnet_tx_dring_avail(dr) < | |
492 | VNET_TX_WAKEUP_THRESH(dr)) { | |
493 | wake = 0; | |
494 | break; | |
495 | } | |
496 | } | |
497 | if (wake) | |
498 | netif_wake_queue(dev); | |
499 | } | |
500 | netif_tx_unlock(dev); | |
501 | } | |
502 | ||
503 | static void vnet_event(void *arg, int event) | |
504 | { | |
505 | struct vnet_port *port = arg; | |
506 | struct vio_driver_state *vio = &port->vio; | |
507 | unsigned long flags; | |
508 | int tx_wakeup, err; | |
509 | ||
510 | spin_lock_irqsave(&vio->lock, flags); | |
511 | ||
512 | if (unlikely(event == LDC_EVENT_RESET || | |
513 | event == LDC_EVENT_UP)) { | |
514 | vio_link_state_change(vio, event); | |
515 | spin_unlock_irqrestore(&vio->lock, flags); | |
516 | ||
d762acdb DM |
517 | if (event == LDC_EVENT_RESET) |
518 | vio_port_up(vio); | |
4c521e42 DM |
519 | return; |
520 | } | |
521 | ||
522 | if (unlikely(event != LDC_EVENT_DATA_READY)) { | |
4d5870ec | 523 | pr_warning("Unexpected LDC event %d\n", event); |
4c521e42 DM |
524 | spin_unlock_irqrestore(&vio->lock, flags); |
525 | return; | |
526 | } | |
527 | ||
528 | tx_wakeup = err = 0; | |
529 | while (1) { | |
530 | union { | |
531 | struct vio_msg_tag tag; | |
532 | u64 raw[8]; | |
533 | } msgbuf; | |
534 | ||
535 | err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); | |
536 | if (unlikely(err < 0)) { | |
537 | if (err == -ECONNRESET) | |
538 | vio_conn_reset(vio); | |
539 | break; | |
540 | } | |
541 | if (err == 0) | |
542 | break; | |
543 | viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", | |
544 | msgbuf.tag.type, | |
545 | msgbuf.tag.stype, | |
546 | msgbuf.tag.stype_env, | |
547 | msgbuf.tag.sid); | |
548 | err = vio_validate_sid(vio, &msgbuf.tag); | |
549 | if (err < 0) | |
550 | break; | |
551 | ||
552 | if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { | |
553 | if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) { | |
554 | err = vnet_rx(port, &msgbuf); | |
555 | } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) { | |
556 | err = vnet_ack(port, &msgbuf); | |
557 | if (err > 0) | |
558 | tx_wakeup |= err; | |
559 | } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) { | |
560 | err = vnet_nack(port, &msgbuf); | |
561 | } | |
562 | } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { | |
028ebff2 DM |
563 | if (msgbuf.tag.stype_env == VNET_MCAST_INFO) |
564 | err = handle_mcast(port, &msgbuf); | |
565 | else | |
566 | err = vio_control_pkt_engine(vio, &msgbuf); | |
4c521e42 DM |
567 | if (err) |
568 | break; | |
569 | } else { | |
570 | err = vnet_handle_unknown(port, &msgbuf); | |
571 | } | |
572 | if (err == -ECONNRESET) | |
573 | break; | |
574 | } | |
575 | spin_unlock(&vio->lock); | |
576 | if (unlikely(tx_wakeup && err != -ECONNRESET)) | |
577 | maybe_tx_wakeup(port->vp); | |
578 | local_irq_restore(flags); | |
579 | } | |
580 | ||
581 | static int __vnet_tx_trigger(struct vnet_port *port) | |
582 | { | |
583 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
584 | struct vio_dring_data hdr = { | |
585 | .tag = { | |
586 | .type = VIO_TYPE_DATA, | |
587 | .stype = VIO_SUBTYPE_INFO, | |
588 | .stype_env = VIO_DRING_DATA, | |
589 | .sid = vio_send_sid(&port->vio), | |
590 | }, | |
591 | .dring_ident = dr->ident, | |
592 | .start_idx = dr->prod, | |
593 | .end_idx = (u32) -1, | |
594 | }; | |
595 | int err, delay; | |
596 | ||
597 | hdr.seq = dr->snd_nxt; | |
598 | delay = 1; | |
599 | do { | |
600 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); | |
601 | if (err > 0) { | |
602 | dr->snd_nxt++; | |
603 | break; | |
604 | } | |
605 | udelay(delay); | |
606 | if ((delay <<= 1) > 128) | |
607 | delay = 128; | |
608 | } while (err == -EAGAIN); | |
609 | ||
610 | return err; | |
611 | } | |
612 | ||
613 | struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb) | |
614 | { | |
615 | unsigned int hash = vnet_hashfn(skb->data); | |
616 | struct hlist_head *hp = &vp->port_hash[hash]; | |
4c521e42 DM |
617 | struct vnet_port *port; |
618 | ||
b67bfe0d | 619 | hlist_for_each_entry(port, hp, hash) { |
2e42e474 | 620 | if (ether_addr_equal(port->raddr, skb->data)) |
4c521e42 DM |
621 | return port; |
622 | } | |
623 | port = NULL; | |
624 | if (!list_empty(&vp->port_list)) | |
625 | port = list_entry(vp->port_list.next, struct vnet_port, list); | |
626 | ||
627 | return port; | |
628 | } | |
629 | ||
630 | struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb) | |
631 | { | |
632 | struct vnet_port *ret; | |
633 | unsigned long flags; | |
634 | ||
635 | spin_lock_irqsave(&vp->lock, flags); | |
636 | ret = __tx_port_find(vp, skb); | |
637 | spin_unlock_irqrestore(&vp->lock, flags); | |
638 | ||
639 | return ret; | |
640 | } | |
641 | ||
642 | static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
643 | { | |
644 | struct vnet *vp = netdev_priv(dev); | |
645 | struct vnet_port *port = tx_port_find(vp, skb); | |
646 | struct vio_dring_state *dr; | |
647 | struct vio_net_desc *d; | |
648 | unsigned long flags; | |
649 | unsigned int len; | |
650 | void *tx_buf; | |
651 | int i, err; | |
652 | ||
653 | if (unlikely(!port)) | |
654 | goto out_dropped; | |
655 | ||
656 | spin_lock_irqsave(&port->vio.lock, flags); | |
657 | ||
658 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
659 | if (unlikely(vnet_tx_dring_avail(dr) < 2)) { | |
660 | if (!netif_queue_stopped(dev)) { | |
661 | netif_stop_queue(dev); | |
662 | ||
663 | /* This is a hard error, log it. */ | |
4d5870ec | 664 | netdev_err(dev, "BUG! Tx Ring full when queue awake!\n"); |
4c521e42 DM |
665 | dev->stats.tx_errors++; |
666 | } | |
667 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
668 | return NETDEV_TX_BUSY; | |
669 | } | |
670 | ||
671 | d = vio_dring_cur(dr); | |
672 | ||
673 | tx_buf = port->tx_bufs[dr->prod].buf; | |
674 | skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len); | |
675 | ||
676 | len = skb->len; | |
677 | if (len < ETH_ZLEN) { | |
678 | len = ETH_ZLEN; | |
679 | memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len); | |
680 | } | |
681 | ||
682 | d->hdr.ack = VIO_ACK_ENABLE; | |
683 | d->size = len; | |
684 | d->ncookies = port->tx_bufs[dr->prod].ncookies; | |
685 | for (i = 0; i < d->ncookies; i++) | |
686 | d->cookies[i] = port->tx_bufs[dr->prod].cookies[i]; | |
687 | ||
688 | /* This has to be a non-SMP write barrier because we are writing | |
689 | * to memory which is shared with the peer LDOM. | |
690 | */ | |
691 | wmb(); | |
692 | ||
693 | d->hdr.state = VIO_DESC_READY; | |
694 | ||
695 | err = __vnet_tx_trigger(port); | |
696 | if (unlikely(err < 0)) { | |
4d5870ec | 697 | netdev_info(dev, "TX trigger error %d\n", err); |
4c521e42 DM |
698 | d->hdr.state = VIO_DESC_FREE; |
699 | dev->stats.tx_carrier_errors++; | |
700 | goto out_dropped_unlock; | |
701 | } | |
702 | ||
703 | dev->stats.tx_packets++; | |
704 | dev->stats.tx_bytes += skb->len; | |
705 | ||
706 | dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); | |
707 | if (unlikely(vnet_tx_dring_avail(dr) < 2)) { | |
708 | netif_stop_queue(dev); | |
709 | if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) | |
710 | netif_wake_queue(dev); | |
711 | } | |
712 | ||
713 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
714 | ||
715 | dev_kfree_skb(skb); | |
716 | ||
4c521e42 DM |
717 | return NETDEV_TX_OK; |
718 | ||
719 | out_dropped_unlock: | |
720 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
721 | ||
722 | out_dropped: | |
723 | dev_kfree_skb(skb); | |
724 | dev->stats.tx_dropped++; | |
725 | return NETDEV_TX_OK; | |
726 | } | |
727 | ||
728 | static void vnet_tx_timeout(struct net_device *dev) | |
729 | { | |
730 | /* XXX Implement me XXX */ | |
731 | } | |
732 | ||
733 | static int vnet_open(struct net_device *dev) | |
734 | { | |
735 | netif_carrier_on(dev); | |
736 | netif_start_queue(dev); | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
741 | static int vnet_close(struct net_device *dev) | |
742 | { | |
743 | netif_stop_queue(dev); | |
744 | netif_carrier_off(dev); | |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
028ebff2 DM |
749 | static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr) |
750 | { | |
751 | struct vnet_mcast_entry *m; | |
752 | ||
753 | for (m = vp->mcast_list; m; m = m->next) { | |
754 | if (!memcmp(m->addr, addr, ETH_ALEN)) | |
755 | return m; | |
756 | } | |
757 | return NULL; | |
758 | } | |
759 | ||
760 | static void __update_mc_list(struct vnet *vp, struct net_device *dev) | |
761 | { | |
22bedad3 | 762 | struct netdev_hw_addr *ha; |
028ebff2 | 763 | |
22bedad3 | 764 | netdev_for_each_mc_addr(ha, dev) { |
028ebff2 DM |
765 | struct vnet_mcast_entry *m; |
766 | ||
22bedad3 | 767 | m = __vnet_mc_find(vp, ha->addr); |
028ebff2 DM |
768 | if (m) { |
769 | m->hit = 1; | |
770 | continue; | |
771 | } | |
772 | ||
773 | if (!m) { | |
774 | m = kzalloc(sizeof(*m), GFP_ATOMIC); | |
775 | if (!m) | |
776 | continue; | |
22bedad3 | 777 | memcpy(m->addr, ha->addr, ETH_ALEN); |
028ebff2 DM |
778 | m->hit = 1; |
779 | ||
780 | m->next = vp->mcast_list; | |
781 | vp->mcast_list = m; | |
782 | } | |
783 | } | |
784 | } | |
785 | ||
786 | static void __send_mc_list(struct vnet *vp, struct vnet_port *port) | |
787 | { | |
788 | struct vio_net_mcast_info info; | |
789 | struct vnet_mcast_entry *m, **pp; | |
790 | int n_addrs; | |
791 | ||
792 | memset(&info, 0, sizeof(info)); | |
793 | ||
794 | info.tag.type = VIO_TYPE_CTRL; | |
795 | info.tag.stype = VIO_SUBTYPE_INFO; | |
796 | info.tag.stype_env = VNET_MCAST_INFO; | |
797 | info.tag.sid = vio_send_sid(&port->vio); | |
798 | info.set = 1; | |
799 | ||
800 | n_addrs = 0; | |
801 | for (m = vp->mcast_list; m; m = m->next) { | |
802 | if (m->sent) | |
803 | continue; | |
804 | m->sent = 1; | |
805 | memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], | |
806 | m->addr, ETH_ALEN); | |
807 | if (++n_addrs == VNET_NUM_MCAST) { | |
808 | info.count = n_addrs; | |
809 | ||
810 | (void) vio_ldc_send(&port->vio, &info, | |
811 | sizeof(info)); | |
812 | n_addrs = 0; | |
813 | } | |
814 | } | |
815 | if (n_addrs) { | |
816 | info.count = n_addrs; | |
817 | (void) vio_ldc_send(&port->vio, &info, sizeof(info)); | |
818 | } | |
819 | ||
820 | info.set = 0; | |
821 | ||
822 | n_addrs = 0; | |
823 | pp = &vp->mcast_list; | |
824 | while ((m = *pp) != NULL) { | |
825 | if (m->hit) { | |
826 | m->hit = 0; | |
827 | pp = &m->next; | |
828 | continue; | |
829 | } | |
830 | ||
831 | memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], | |
832 | m->addr, ETH_ALEN); | |
833 | if (++n_addrs == VNET_NUM_MCAST) { | |
834 | info.count = n_addrs; | |
835 | (void) vio_ldc_send(&port->vio, &info, | |
836 | sizeof(info)); | |
837 | n_addrs = 0; | |
838 | } | |
839 | ||
840 | *pp = m->next; | |
841 | kfree(m); | |
842 | } | |
843 | if (n_addrs) { | |
844 | info.count = n_addrs; | |
845 | (void) vio_ldc_send(&port->vio, &info, sizeof(info)); | |
846 | } | |
847 | } | |
848 | ||
4c521e42 DM |
849 | static void vnet_set_rx_mode(struct net_device *dev) |
850 | { | |
028ebff2 DM |
851 | struct vnet *vp = netdev_priv(dev); |
852 | struct vnet_port *port; | |
853 | unsigned long flags; | |
854 | ||
855 | spin_lock_irqsave(&vp->lock, flags); | |
856 | if (!list_empty(&vp->port_list)) { | |
857 | port = list_entry(vp->port_list.next, struct vnet_port, list); | |
858 | ||
859 | if (port->switch_port) { | |
860 | __update_mc_list(vp, dev); | |
861 | __send_mc_list(vp, port); | |
862 | } | |
863 | } | |
864 | spin_unlock_irqrestore(&vp->lock, flags); | |
4c521e42 DM |
865 | } |
866 | ||
867 | static int vnet_change_mtu(struct net_device *dev, int new_mtu) | |
868 | { | |
869 | if (new_mtu != ETH_DATA_LEN) | |
870 | return -EINVAL; | |
871 | ||
872 | dev->mtu = new_mtu; | |
873 | return 0; | |
874 | } | |
875 | ||
876 | static int vnet_set_mac_addr(struct net_device *dev, void *p) | |
877 | { | |
878 | return -EINVAL; | |
879 | } | |
880 | ||
881 | static void vnet_get_drvinfo(struct net_device *dev, | |
882 | struct ethtool_drvinfo *info) | |
883 | { | |
7826d43f JP |
884 | strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); |
885 | strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version)); | |
4c521e42 DM |
886 | } |
887 | ||
888 | static u32 vnet_get_msglevel(struct net_device *dev) | |
889 | { | |
890 | struct vnet *vp = netdev_priv(dev); | |
891 | return vp->msg_enable; | |
892 | } | |
893 | ||
894 | static void vnet_set_msglevel(struct net_device *dev, u32 value) | |
895 | { | |
896 | struct vnet *vp = netdev_priv(dev); | |
897 | vp->msg_enable = value; | |
898 | } | |
899 | ||
900 | static const struct ethtool_ops vnet_ethtool_ops = { | |
901 | .get_drvinfo = vnet_get_drvinfo, | |
902 | .get_msglevel = vnet_get_msglevel, | |
903 | .set_msglevel = vnet_set_msglevel, | |
904 | .get_link = ethtool_op_get_link, | |
4c521e42 DM |
905 | }; |
906 | ||
907 | static void vnet_port_free_tx_bufs(struct vnet_port *port) | |
908 | { | |
909 | struct vio_dring_state *dr; | |
910 | int i; | |
911 | ||
912 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
913 | if (dr->base) { | |
914 | ldc_free_exp_dring(port->vio.lp, dr->base, | |
915 | (dr->entry_size * dr->num_entries), | |
916 | dr->cookies, dr->ncookies); | |
917 | dr->base = NULL; | |
918 | dr->entry_size = 0; | |
919 | dr->num_entries = 0; | |
920 | dr->pending = 0; | |
921 | dr->ncookies = 0; | |
922 | } | |
923 | ||
924 | for (i = 0; i < VNET_TX_RING_SIZE; i++) { | |
925 | void *buf = port->tx_bufs[i].buf; | |
926 | ||
927 | if (!buf) | |
928 | continue; | |
929 | ||
930 | ldc_unmap(port->vio.lp, | |
931 | port->tx_bufs[i].cookies, | |
932 | port->tx_bufs[i].ncookies); | |
933 | ||
934 | kfree(buf); | |
935 | port->tx_bufs[i].buf = NULL; | |
936 | } | |
937 | } | |
938 | ||
f73d12bd | 939 | static int vnet_port_alloc_tx_bufs(struct vnet_port *port) |
4c521e42 DM |
940 | { |
941 | struct vio_dring_state *dr; | |
942 | unsigned long len; | |
943 | int i, err, ncookies; | |
944 | void *dring; | |
945 | ||
946 | for (i = 0; i < VNET_TX_RING_SIZE; i++) { | |
947 | void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL); | |
948 | int map_len = (ETH_FRAME_LEN + 7) & ~7; | |
949 | ||
950 | err = -ENOMEM; | |
e404decb | 951 | if (!buf) |
4c521e42 | 952 | goto err_out; |
e404decb | 953 | |
4c521e42 DM |
954 | err = -EFAULT; |
955 | if ((unsigned long)buf & (8UL - 1)) { | |
4d5870ec | 956 | pr_err("TX buffer misaligned\n"); |
4c521e42 DM |
957 | kfree(buf); |
958 | goto err_out; | |
959 | } | |
960 | ||
961 | err = ldc_map_single(port->vio.lp, buf, map_len, | |
962 | port->tx_bufs[i].cookies, 2, | |
963 | (LDC_MAP_SHADOW | | |
964 | LDC_MAP_DIRECT | | |
965 | LDC_MAP_RW)); | |
966 | if (err < 0) { | |
967 | kfree(buf); | |
968 | goto err_out; | |
969 | } | |
970 | port->tx_bufs[i].buf = buf; | |
971 | port->tx_bufs[i].ncookies = err; | |
972 | } | |
973 | ||
974 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
975 | ||
976 | len = (VNET_TX_RING_SIZE * | |
977 | (sizeof(struct vio_net_desc) + | |
978 | (sizeof(struct ldc_trans_cookie) * 2))); | |
979 | ||
980 | ncookies = VIO_MAX_RING_COOKIES; | |
981 | dring = ldc_alloc_exp_dring(port->vio.lp, len, | |
982 | dr->cookies, &ncookies, | |
983 | (LDC_MAP_SHADOW | | |
984 | LDC_MAP_DIRECT | | |
985 | LDC_MAP_RW)); | |
986 | if (IS_ERR(dring)) { | |
987 | err = PTR_ERR(dring); | |
988 | goto err_out; | |
989 | } | |
990 | ||
991 | dr->base = dring; | |
992 | dr->entry_size = (sizeof(struct vio_net_desc) + | |
993 | (sizeof(struct ldc_trans_cookie) * 2)); | |
994 | dr->num_entries = VNET_TX_RING_SIZE; | |
995 | dr->prod = dr->cons = 0; | |
996 | dr->pending = VNET_TX_RING_SIZE; | |
997 | dr->ncookies = ncookies; | |
998 | ||
999 | return 0; | |
1000 | ||
1001 | err_out: | |
1002 | vnet_port_free_tx_bufs(port); | |
1003 | ||
1004 | return err; | |
1005 | } | |
1006 | ||
9184a046 DM |
1007 | static LIST_HEAD(vnet_list); |
1008 | static DEFINE_MUTEX(vnet_list_mutex); | |
1009 | ||
8fd17f2e DM |
1010 | static const struct net_device_ops vnet_ops = { |
1011 | .ndo_open = vnet_open, | |
1012 | .ndo_stop = vnet_close, | |
afc4b13d | 1013 | .ndo_set_rx_mode = vnet_set_rx_mode, |
8fd17f2e | 1014 | .ndo_set_mac_address = vnet_set_mac_addr, |
240c102d | 1015 | .ndo_validate_addr = eth_validate_addr, |
8fd17f2e DM |
1016 | .ndo_tx_timeout = vnet_tx_timeout, |
1017 | .ndo_change_mtu = vnet_change_mtu, | |
1018 | .ndo_start_xmit = vnet_start_xmit, | |
1019 | }; | |
1020 | ||
f73d12bd | 1021 | static struct vnet *vnet_new(const u64 *local_mac) |
9184a046 DM |
1022 | { |
1023 | struct net_device *dev; | |
1024 | struct vnet *vp; | |
1025 | int err, i; | |
1026 | ||
1027 | dev = alloc_etherdev(sizeof(*vp)); | |
41de8d4c | 1028 | if (!dev) |
9184a046 | 1029 | return ERR_PTR(-ENOMEM); |
9184a046 DM |
1030 | |
1031 | for (i = 0; i < ETH_ALEN; i++) | |
1032 | dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff; | |
1033 | ||
9184a046 DM |
1034 | vp = netdev_priv(dev); |
1035 | ||
1036 | spin_lock_init(&vp->lock); | |
1037 | vp->dev = dev; | |
1038 | ||
1039 | INIT_LIST_HEAD(&vp->port_list); | |
1040 | for (i = 0; i < VNET_PORT_HASH_SIZE; i++) | |
1041 | INIT_HLIST_HEAD(&vp->port_hash[i]); | |
1042 | INIT_LIST_HEAD(&vp->list); | |
1043 | vp->local_mac = *local_mac; | |
1044 | ||
8fd17f2e | 1045 | dev->netdev_ops = &vnet_ops; |
9184a046 DM |
1046 | dev->ethtool_ops = &vnet_ethtool_ops; |
1047 | dev->watchdog_timeo = VNET_TX_TIMEOUT; | |
9184a046 DM |
1048 | |
1049 | err = register_netdev(dev); | |
1050 | if (err) { | |
4d5870ec | 1051 | pr_err("Cannot register net device, aborting\n"); |
9184a046 DM |
1052 | goto err_out_free_dev; |
1053 | } | |
1054 | ||
4d5870ec | 1055 | netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr); |
9184a046 DM |
1056 | |
1057 | list_add(&vp->list, &vnet_list); | |
1058 | ||
1059 | return vp; | |
1060 | ||
1061 | err_out_free_dev: | |
1062 | free_netdev(dev); | |
1063 | ||
1064 | return ERR_PTR(err); | |
1065 | } | |
1066 | ||
f73d12bd | 1067 | static struct vnet *vnet_find_or_create(const u64 *local_mac) |
9184a046 DM |
1068 | { |
1069 | struct vnet *iter, *vp; | |
1070 | ||
1071 | mutex_lock(&vnet_list_mutex); | |
1072 | vp = NULL; | |
1073 | list_for_each_entry(iter, &vnet_list, list) { | |
1074 | if (iter->local_mac == *local_mac) { | |
1075 | vp = iter; | |
1076 | break; | |
1077 | } | |
1078 | } | |
1079 | if (!vp) | |
1080 | vp = vnet_new(local_mac); | |
1081 | mutex_unlock(&vnet_list_mutex); | |
1082 | ||
1083 | return vp; | |
1084 | } | |
1085 | ||
1086 | static const char *local_mac_prop = "local-mac-address"; | |
1087 | ||
f73d12bd | 1088 | static struct vnet *vnet_find_parent(struct mdesc_handle *hp, |
9184a046 DM |
1089 | u64 port_node) |
1090 | { | |
1091 | const u64 *local_mac = NULL; | |
1092 | u64 a; | |
1093 | ||
1094 | mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { | |
1095 | u64 target = mdesc_arc_target(hp, a); | |
1096 | const char *name; | |
1097 | ||
1098 | name = mdesc_get_property(hp, target, "name", NULL); | |
1099 | if (!name || strcmp(name, "network")) | |
1100 | continue; | |
1101 | ||
1102 | local_mac = mdesc_get_property(hp, target, | |
1103 | local_mac_prop, NULL); | |
1104 | if (local_mac) | |
1105 | break; | |
1106 | } | |
1107 | if (!local_mac) | |
1108 | return ERR_PTR(-ENODEV); | |
1109 | ||
1110 | return vnet_find_or_create(local_mac); | |
1111 | } | |
1112 | ||
4c521e42 DM |
1113 | static struct ldc_channel_config vnet_ldc_cfg = { |
1114 | .event = vnet_event, | |
1115 | .mtu = 64, | |
1116 | .mode = LDC_MODE_UNRELIABLE, | |
1117 | }; | |
1118 | ||
1119 | static struct vio_driver_ops vnet_vio_ops = { | |
1120 | .send_attr = vnet_send_attr, | |
1121 | .handle_attr = vnet_handle_attr, | |
1122 | .handshake_complete = vnet_handshake_complete, | |
1123 | }; | |
1124 | ||
f73d12bd | 1125 | static void print_version(void) |
9184a046 | 1126 | { |
4d5870ec | 1127 | printk_once(KERN_INFO "%s", version); |
9184a046 DM |
1128 | } |
1129 | ||
4c521e42 DM |
1130 | const char *remote_macaddr_prop = "remote-mac-address"; |
1131 | ||
1dd06ae8 | 1132 | static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
4c521e42 | 1133 | { |
43fdf274 | 1134 | struct mdesc_handle *hp; |
4c521e42 DM |
1135 | struct vnet_port *port; |
1136 | unsigned long flags; | |
1137 | struct vnet *vp; | |
1138 | const u64 *rmac; | |
1139 | int len, i, err, switch_port; | |
1140 | ||
9184a046 | 1141 | print_version(); |
4c521e42 | 1142 | |
43fdf274 DM |
1143 | hp = mdesc_grab(); |
1144 | ||
9184a046 DM |
1145 | vp = vnet_find_parent(hp, vdev->mp); |
1146 | if (IS_ERR(vp)) { | |
4d5870ec | 1147 | pr_err("Cannot find port parent vnet\n"); |
9184a046 DM |
1148 | err = PTR_ERR(vp); |
1149 | goto err_out_put_mdesc; | |
1150 | } | |
1151 | ||
43fdf274 DM |
1152 | rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); |
1153 | err = -ENODEV; | |
4c521e42 | 1154 | if (!rmac) { |
4d5870ec | 1155 | pr_err("Port lacks %s property\n", remote_macaddr_prop); |
43fdf274 | 1156 | goto err_out_put_mdesc; |
4c521e42 DM |
1157 | } |
1158 | ||
1159 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
43fdf274 | 1160 | err = -ENOMEM; |
e404decb | 1161 | if (!port) |
43fdf274 | 1162 | goto err_out_put_mdesc; |
4c521e42 DM |
1163 | |
1164 | for (i = 0; i < ETH_ALEN; i++) | |
1165 | port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; | |
1166 | ||
1167 | port->vp = vp; | |
1168 | ||
43fdf274 | 1169 | err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, |
4c521e42 DM |
1170 | vnet_versions, ARRAY_SIZE(vnet_versions), |
1171 | &vnet_vio_ops, vp->dev->name); | |
1172 | if (err) | |
1173 | goto err_out_free_port; | |
1174 | ||
1175 | err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port); | |
1176 | if (err) | |
1177 | goto err_out_free_port; | |
1178 | ||
1179 | err = vnet_port_alloc_tx_bufs(port); | |
1180 | if (err) | |
1181 | goto err_out_free_ldc; | |
1182 | ||
1183 | INIT_HLIST_NODE(&port->hash); | |
1184 | INIT_LIST_HEAD(&port->list); | |
1185 | ||
1186 | switch_port = 0; | |
43fdf274 | 1187 | if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL) |
4c521e42 | 1188 | switch_port = 1; |
028ebff2 | 1189 | port->switch_port = switch_port; |
4c521e42 DM |
1190 | |
1191 | spin_lock_irqsave(&vp->lock, flags); | |
1192 | if (switch_port) | |
1193 | list_add(&port->list, &vp->port_list); | |
1194 | else | |
1195 | list_add_tail(&port->list, &vp->port_list); | |
1196 | hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]); | |
1197 | spin_unlock_irqrestore(&vp->lock, flags); | |
1198 | ||
1199 | dev_set_drvdata(&vdev->dev, port); | |
1200 | ||
4d5870ec JP |
1201 | pr_info("%s: PORT ( remote-mac %pM%s )\n", |
1202 | vp->dev->name, port->raddr, switch_port ? " switch-port" : ""); | |
4c521e42 DM |
1203 | |
1204 | vio_port_up(&port->vio); | |
1205 | ||
43fdf274 DM |
1206 | mdesc_release(hp); |
1207 | ||
4c521e42 DM |
1208 | return 0; |
1209 | ||
1210 | err_out_free_ldc: | |
1211 | vio_ldc_free(&port->vio); | |
1212 | ||
1213 | err_out_free_port: | |
1214 | kfree(port); | |
1215 | ||
43fdf274 DM |
1216 | err_out_put_mdesc: |
1217 | mdesc_release(hp); | |
4c521e42 DM |
1218 | return err; |
1219 | } | |
1220 | ||
1221 | static int vnet_port_remove(struct vio_dev *vdev) | |
1222 | { | |
1223 | struct vnet_port *port = dev_get_drvdata(&vdev->dev); | |
1224 | ||
1225 | if (port) { | |
1226 | struct vnet *vp = port->vp; | |
1227 | unsigned long flags; | |
1228 | ||
1229 | del_timer_sync(&port->vio.timer); | |
1230 | ||
1231 | spin_lock_irqsave(&vp->lock, flags); | |
1232 | list_del(&port->list); | |
1233 | hlist_del(&port->hash); | |
1234 | spin_unlock_irqrestore(&vp->lock, flags); | |
1235 | ||
1236 | vnet_port_free_tx_bufs(port); | |
1237 | vio_ldc_free(&port->vio); | |
1238 | ||
1239 | dev_set_drvdata(&vdev->dev, NULL); | |
1240 | ||
1241 | kfree(port); | |
1242 | } | |
1243 | return 0; | |
1244 | } | |
1245 | ||
3d452e55 | 1246 | static const struct vio_device_id vnet_port_match[] = { |
4c521e42 DM |
1247 | { |
1248 | .type = "vnet-port", | |
1249 | }, | |
1250 | {}, | |
1251 | }; | |
da68e081 | 1252 | MODULE_DEVICE_TABLE(vio, vnet_port_match); |
4c521e42 DM |
1253 | |
1254 | static struct vio_driver vnet_port_driver = { | |
1255 | .id_table = vnet_port_match, | |
1256 | .probe = vnet_port_probe, | |
1257 | .remove = vnet_port_remove, | |
cb52d897 | 1258 | .name = "vnet_port", |
4c521e42 DM |
1259 | }; |
1260 | ||
4c521e42 DM |
1261 | static int __init vnet_init(void) |
1262 | { | |
9184a046 | 1263 | return vio_register_driver(&vnet_port_driver); |
4c521e42 DM |
1264 | } |
1265 | ||
1266 | static void __exit vnet_exit(void) | |
1267 | { | |
1268 | vio_unregister_driver(&vnet_port_driver); | |
4c521e42 DM |
1269 | } |
1270 | ||
1271 | module_init(vnet_init); | |
1272 | module_exit(vnet_exit); |