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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net...
[deliverable/linux.git] / drivers / net / ethernet / sun / sunvnet.c
CommitLineData
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>
e4defc77 18#include <linux/if_vlan.h>
4c521e42 19
a2b78e9b
DS		 20#if IS_ENABLED(CONFIG_IPV6)
21#include <linux/icmpv6.h>
22#endif
23
24#include <net/icmp.h>
25#include <net/route.h>
26
4c521e42
DM		 27#include <asm/vio.h>
28#include <asm/ldc.h>
29
30#include "sunvnet.h"
31
32#define DRV_MODULE_NAME "sunvnet"
4c521e42
DM		 33#define DRV_MODULE_VERSION "1.0"
34#define DRV_MODULE_RELDATE "June 25, 2007"
35
f73d12bd 36static char version[] =
4c521e42
DM		 37 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
38MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
39MODULE_DESCRIPTION("Sun LDOM virtual network driver");
40MODULE_LICENSE("GPL");
41MODULE_VERSION(DRV_MODULE_VERSION);
42
adddc32d
SV		 43/* Heuristic for the number of times to exponentially backoff and
44 * retry sending an LDC trigger when EAGAIN is encountered
45 */
46#define VNET_MAX_RETRIES 10
47
d1015645
SV		 48static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
49
4c521e42
DM		 50/* Ordered from largest major to lowest */
51static struct vio_version vnet_versions[] = {
e4defc77 52 { .major = 1, .minor = 6 },
4c521e42
DM		 53 { .major = 1, .minor = 0 },
54};
55
56static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
57{
58 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
59}
60
61static int vnet_handle_unknown(struct vnet_port *port, void *arg)
62{
63 struct vio_msg_tag *pkt = arg;
64
4d5870ec 65 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
4c521e42 66 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
4d5870ec 67 pr_err("Resetting connection\n");
4c521e42
DM		 68
69 ldc_disconnect(port->vio.lp);
70
71 return -ECONNRESET;
72}
73
74static int vnet_send_attr(struct vio_driver_state *vio)
75{
76 struct vnet_port *port = to_vnet_port(vio);
77 struct net_device *dev = port->vp->dev;
78 struct vio_net_attr_info pkt;
e4defc77 79 int framelen = ETH_FRAME_LEN;
4c521e42
DM		 80 int i;
81
82 memset(&pkt, 0, sizeof(pkt));
83 pkt.tag.type = VIO_TYPE_CTRL;
84 pkt.tag.stype = VIO_SUBTYPE_INFO;
85 pkt.tag.stype_env = VIO_ATTR_INFO;
86 pkt.tag.sid = vio_send_sid(vio);
e4defc77
DS		 87 if (vio_version_before(vio, 1, 2))
88 pkt.xfer_mode = VIO_DRING_MODE;
89 else
90 pkt.xfer_mode = VIO_NEW_DRING_MODE;
4c521e42
DM		 91 pkt.addr_type = VNET_ADDR_ETHERMAC;
92 pkt.ack_freq = 0;
93 for (i = 0; i < 6; i++)
94 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
e4defc77
DS		 95 if (vio_version_after(vio, 1, 3)) {
96 if (port->rmtu) {
97 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
98 pkt.mtu = port->rmtu;
99 } else {
100 port->rmtu = VNET_MAXPACKET;
101 pkt.mtu = port->rmtu;
102 }
103 if (vio_version_after_eq(vio, 1, 6))
104 pkt.options = VIO_TX_DRING;
105 } else if (vio_version_before(vio, 1, 3)) {
106 pkt.mtu = framelen;
107 } else { /* v1.3 */
108 pkt.mtu = framelen + VLAN_HLEN;
109 }
110
111 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
112 pkt.cflags = 0;
4c521e42
DM		 113
114 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
e4defc77
DS		 115 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
116 "cflags[0x%04x] lso_max[%u]\n",
4c521e42 117 pkt.xfer_mode, pkt.addr_type,
e4defc77
DS		 118 (unsigned long long)pkt.addr,
119 pkt.ack_freq, pkt.plnk_updt, pkt.options,
120 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
121
4c521e42
DM		 122
123 return vio_ldc_send(vio, &pkt, sizeof(pkt));
124}
125
126static int handle_attr_info(struct vio_driver_state *vio,
127 struct vio_net_attr_info *pkt)
128{
e4defc77
DS		 129 struct vnet_port *port = to_vnet_port(vio);
130 u64 localmtu;
131 u8 xfer_mode;
132
133 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
134 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
135 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
4c521e42 136 pkt->xfer_mode, pkt->addr_type,
e4defc77
DS		 137 (unsigned long long)pkt->addr,
138 pkt->ack_freq, pkt->plnk_updt, pkt->options,
139 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
140 pkt->ipv4_lso_maxlen);
4c521e42
DM		 141
142 pkt->tag.sid = vio_send_sid(vio);
143
e4defc77
DS		 144 xfer_mode = pkt->xfer_mode;
145 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
146 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
147 xfer_mode = VIO_NEW_DRING_MODE;
148
149 /* MTU negotiation:
150 * < v1.3 - ETH_FRAME_LEN exactly
151 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
152 * pkt->mtu for ACK
153 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
154 */
155 if (vio_version_before(vio, 1, 3)) {
156 localmtu = ETH_FRAME_LEN;
157 } else if (vio_version_after(vio, 1, 3)) {
158 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
159 localmtu = min(pkt->mtu, localmtu);
160 pkt->mtu = localmtu;
161 } else { /* v1.3 */
162 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
163 }
164 port->rmtu = localmtu;
165
166 /* for version >= 1.6, ACK packet mode we support */
167 if (vio_version_after_eq(vio, 1, 6)) {
168 pkt->xfer_mode = VIO_NEW_DRING_MODE;
169 pkt->options = VIO_TX_DRING;
170 }
171
172 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
4c521e42 173 pkt->addr_type != VNET_ADDR_ETHERMAC ||
e4defc77 174 pkt->mtu != localmtu) {
4c521e42
DM		 175 viodbg(HS, "SEND NET ATTR NACK\n");
176
177 pkt->tag.stype = VIO_SUBTYPE_NACK;
178
179 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
180
181 return -ECONNRESET;
182 } else {
e4defc77
DS		 183 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
184 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
185 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
186 pkt->xfer_mode, pkt->addr_type,
187 (unsigned long long)pkt->addr,
188 pkt->ack_freq, pkt->plnk_updt, pkt->options,
189 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
190 pkt->ipv4_lso_maxlen);
4c521e42
DM		 191
192 pkt->tag.stype = VIO_SUBTYPE_ACK;
193
194 return vio_ldc_send(vio, pkt, sizeof(*pkt));
195 }
196
197}
198
199static int handle_attr_ack(struct vio_driver_state *vio,
200 struct vio_net_attr_info *pkt)
201{
202 viodbg(HS, "GOT NET ATTR ACK\n");
203
204 return 0;
205}
206
207static int handle_attr_nack(struct vio_driver_state *vio,
208 struct vio_net_attr_info *pkt)
209{
210 viodbg(HS, "GOT NET ATTR NACK\n");
211
212 return -ECONNRESET;
213}
214
215static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
216{
217 struct vio_net_attr_info *pkt = arg;
218
219 switch (pkt->tag.stype) {
220 case VIO_SUBTYPE_INFO:
221 return handle_attr_info(vio, pkt);
222
223 case VIO_SUBTYPE_ACK:
224 return handle_attr_ack(vio, pkt);
225
226 case VIO_SUBTYPE_NACK:
227 return handle_attr_nack(vio, pkt);
228
229 default:
230 return -ECONNRESET;
231 }
232}
233
234static void vnet_handshake_complete(struct vio_driver_state *vio)
235{
236 struct vio_dring_state *dr;
237
238 dr = &vio->drings[VIO_DRIVER_RX_RING];
239 dr->snd_nxt = dr->rcv_nxt = 1;
240
241 dr = &vio->drings[VIO_DRIVER_TX_RING];
242 dr->snd_nxt = dr->rcv_nxt = 1;
243}
244
245/* The hypervisor interface that implements copying to/from imported
246 * memory from another domain requires that copies are done to 8-byte
247 * aligned buffers, and that the lengths of such copies are also 8-byte
248 * multiples.
249 *
250 * So we align skb->data to an 8-byte multiple and pad-out the data
251 * area so we can round the copy length up to the next multiple of
252 * 8 for the copy.
253 *
254 * The transmitter puts the actual start of the packet 6 bytes into
255 * the buffer it sends over, so that the IP headers after the ethernet
256 * header are aligned properly. These 6 bytes are not in the descriptor
257 * length, they are simply implied. This offset is represented using
258 * the VNET_PACKET_SKIP macro.
259 */
260static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
261 unsigned int len)
262{
263 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
264 unsigned long addr, off;
265
266 if (unlikely(!skb))
267 return NULL;
268
269 addr = (unsigned long) skb->data;
270 off = ((addr + 7UL) & ~7UL) - addr;
271 if (off)
272 skb_reserve(skb, off);
273
274 return skb;
275}
276
277static int vnet_rx_one(struct vnet_port *port, unsigned int len,
278 struct ldc_trans_cookie *cookies, int ncookies)
279{
280 struct net_device *dev = port->vp->dev;
281 unsigned int copy_len;
282 struct sk_buff *skb;
283 int err;
284
285 err = -EMSGSIZE;
e4defc77 286 if (unlikely(len < ETH_ZLEN || len > port->rmtu)) {
4c521e42
DM		 287 dev->stats.rx_length_errors++;
288 goto out_dropped;
289 }
290
291 skb = alloc_and_align_skb(dev, len);
292 err = -ENOMEM;
293 if (unlikely(!skb)) {
294 dev->stats.rx_missed_errors++;
295 goto out_dropped;
296 }
297
298 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
299 skb_put(skb, copy_len);
300 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
301 skb->data, copy_len, 0,
302 cookies, ncookies);
303 if (unlikely(err < 0)) {
304 dev->stats.rx_frame_errors++;
305 goto out_free_skb;
306 }
307
308 skb_pull(skb, VNET_PACKET_SKIP);
309 skb_trim(skb, len);
310 skb->protocol = eth_type_trans(skb, dev);
311
312 dev->stats.rx_packets++;
313 dev->stats.rx_bytes += len;
314
315 netif_rx(skb);
316
317 return 0;
318
319out_free_skb:
320 kfree_skb(skb);
321
322out_dropped:
323 dev->stats.rx_dropped++;
324 return err;
325}
326
327static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
328 u32 start, u32 end, u8 vio_dring_state)
329{
330 struct vio_dring_data hdr = {
331 .tag = {
332 .type = VIO_TYPE_DATA,
333 .stype = VIO_SUBTYPE_ACK,
334 .stype_env = VIO_DRING_DATA,
335 .sid = vio_send_sid(&port->vio),
336 },
337 .dring_ident = dr->ident,
338 .start_idx = start,
339 .end_idx = end,
340 .state = vio_dring_state,
341 };
342 int err, delay;
adddc32d 343 int retries = 0;
4c521e42
DM		 344
345 hdr.seq = dr->snd_nxt;
346 delay = 1;
347 do {
348 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
349 if (err > 0) {
350 dr->snd_nxt++;
351 break;
352 }
353 udelay(delay);
354 if ((delay <<= 1) > 128)
355 delay = 128;
adddc32d
SV		 356 if (retries++ > VNET_MAX_RETRIES) {
357 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
358 port->raddr[0], port->raddr[1],
359 port->raddr[2], port->raddr[3],
360 port->raddr[4], port->raddr[5]);
d1015645 361 break;
adddc32d 362 }
4c521e42
DM		 363 } while (err == -EAGAIN);
364
d1015645
SV		 365 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
366 port->stop_rx_idx = end;
367 port->stop_rx = true;
368 } else {
369 port->stop_rx_idx = 0;
370 port->stop_rx = false;
371 }
372
4c521e42
DM		 373 return err;
374}
375
376static u32 next_idx(u32 idx, struct vio_dring_state *dr)
377{
378 if (++idx == dr->num_entries)
379 idx = 0;
380 return idx;
381}
382
383static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
384{
385 if (idx == 0)
386 idx = dr->num_entries - 1;
387 else
388 idx--;
389
390 return idx;
391}
392
393static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
394 struct vio_dring_state *dr,
395 u32 index)
396{
397 struct vio_net_desc *desc = port->vio.desc_buf;
398 int err;
399
400 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
401 (index * dr->entry_size),
402 dr->cookies, dr->ncookies);
403 if (err < 0)
404 return ERR_PTR(err);
405
406 return desc;
407}
408
409static int put_rx_desc(struct vnet_port *port,
410 struct vio_dring_state *dr,
411 struct vio_net_desc *desc,
412 u32 index)
413{
414 int err;
415
416 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
417 (index * dr->entry_size),
418 dr->cookies, dr->ncookies);
419 if (err < 0)
420 return err;
421
422 return 0;
423}
424
425static int vnet_walk_rx_one(struct vnet_port *port,
426 struct vio_dring_state *dr,
427 u32 index, int *needs_ack)
428{
429 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
430 struct vio_driver_state *vio = &port->vio;
431 int err;
432
433 if (IS_ERR(desc))
434 return PTR_ERR(desc);
435
78dcff7b
DS		 436 if (desc->hdr.state != VIO_DESC_READY)
437 return 1;
438
439 rmb();
440
3f4528d6 441 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
4c521e42
DM		 442 desc->hdr.state, desc->hdr.ack,
443 desc->size, desc->ncookies,
444 desc->cookies[0].cookie_addr,
445 desc->cookies[0].cookie_size);
446
4c521e42
DM		 447 err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
448 if (err == -ECONNRESET)
449 return err;
450 desc->hdr.state = VIO_DESC_DONE;
451 err = put_rx_desc(port, dr, desc, index);
452 if (err < 0)
453 return err;
454 *needs_ack = desc->hdr.ack;
455 return 0;
456}
457
458static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
459 u32 start, u32 end)
460{
461 struct vio_driver_state *vio = &port->vio;
462 int ack_start = -1, ack_end = -1;
463
464 end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
465
466 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
467
468 while (start != end) {
469 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
470 if (err == -ECONNRESET)
471 return err;
472 if (err != 0)
473 break;
474 if (ack_start == -1)
475 ack_start = start;
476 ack_end = start;
477 start = next_idx(start, dr);
478 if (ack && start != end) {
479 err = vnet_send_ack(port, dr, ack_start, ack_end,
480 VIO_DRING_ACTIVE);
481 if (err == -ECONNRESET)
482 return err;
483 ack_start = -1;
484 }
485 }
486 if (unlikely(ack_start == -1))
487 ack_start = ack_end = prev_idx(start, dr);
488 return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
489}
490
491static int vnet_rx(struct vnet_port *port, void *msgbuf)
492{
493 struct vio_dring_data *pkt = msgbuf;
494 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
495 struct vio_driver_state *vio = &port->vio;
496
3f4528d6 497 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
4c521e42
DM		 498 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
499
500 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
501 return 0;
502 if (unlikely(pkt->seq != dr->rcv_nxt)) {
4d5870ec
JP		 503 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
504 pkt->seq, dr->rcv_nxt);
4c521e42
DM		 505 return 0;
506 }
507
508 dr->rcv_nxt++;
509
510 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
511
512 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
513}
514
515static int idx_is_pending(struct vio_dring_state *dr, u32 end)
516{
517 u32 idx = dr->cons;
518 int found = 0;
519
520 while (idx != dr->prod) {
521 if (idx == end) {
522 found = 1;
523 break;
524 }
525 idx = next_idx(idx, dr);
526 }
527 return found;
528}
529
530static int vnet_ack(struct vnet_port *port, void *msgbuf)
531{
532 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
533 struct vio_dring_data *pkt = msgbuf;
534 struct net_device *dev;
535 struct vnet *vp;
536 u32 end;
d1015645 537 struct vio_net_desc *desc;
4c521e42
DM		 538 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
539 return 0;
540
541 end = pkt->end_idx;
542 if (unlikely(!idx_is_pending(dr, end)))
543 return 0;
544
d1015645
SV		 545 /* sync for race conditions with vnet_start_xmit() and tell xmit it
546 * is time to send a trigger.
547 */
4c521e42 548 dr->cons = next_idx(end, dr);
d1015645
SV		 549 desc = vio_dring_entry(dr, dr->cons);
550 if (desc->hdr.state == VIO_DESC_READY && port->start_cons) {
551 /* vnet_start_xmit() just populated this dring but missed
552 * sending the "start" LDC message to the consumer.
553 * Send a "start" trigger on its behalf.
554 */
555 if (__vnet_tx_trigger(port, dr->cons) > 0)
556 port->start_cons = false;
557 else
558 port->start_cons = true;
559 } else {
560 port->start_cons = true;
561 }
562
4c521e42
DM		 563
564 vp = port->vp;
565 dev = vp->dev;
566 if (unlikely(netif_queue_stopped(dev) &&
567 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
568 return 1;
569
570 return 0;
571}
572
573static int vnet_nack(struct vnet_port *port, void *msgbuf)
574{
575 /* XXX just reset or similar XXX */
576 return 0;
577}
578
028ebff2
DM		 579static int handle_mcast(struct vnet_port *port, void *msgbuf)
580{
581 struct vio_net_mcast_info *pkt = msgbuf;
582
583 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
4d5870ec 584 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
028ebff2
DM		 585 port->vp->dev->name,
586 pkt->tag.type,
587 pkt->tag.stype,
588 pkt->tag.stype_env,
589 pkt->tag.sid);
590
591 return 0;
592}
593
1d311ad2 594static void maybe_tx_wakeup(unsigned long param)
4c521e42 595{
1d311ad2 596 struct vnet *vp = (struct vnet *)param;
4c521e42
DM		 597 struct net_device *dev = vp->dev;
598
599 netif_tx_lock(dev);
600 if (likely(netif_queue_stopped(dev))) {
601 struct vnet_port *port;
602 int wake = 1;
603
604 list_for_each_entry(port, &vp->port_list, list) {
605 struct vio_dring_state *dr;
606
607 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
608 if (vnet_tx_dring_avail(dr) <
609 VNET_TX_WAKEUP_THRESH(dr)) {
610 wake = 0;
611 break;
612 }
613 }
614 if (wake)
615 netif_wake_queue(dev);
616 }
617 netif_tx_unlock(dev);
618}
619
620static void vnet_event(void *arg, int event)
621{
622 struct vnet_port *port = arg;
623 struct vio_driver_state *vio = &port->vio;
624 unsigned long flags;
625 int tx_wakeup, err;
626
627 spin_lock_irqsave(&vio->lock, flags);
628
629 if (unlikely(event == LDC_EVENT_RESET ||
630 event == LDC_EVENT_UP)) {
631 vio_link_state_change(vio, event);
632 spin_unlock_irqrestore(&vio->lock, flags);
633
e4defc77
DS		 634 if (event == LDC_EVENT_RESET) {
635 port->rmtu = 0;
d762acdb 636 vio_port_up(vio);
e4defc77 637 }
4c521e42
DM		 638 return;
639 }
640
641 if (unlikely(event != LDC_EVENT_DATA_READY)) {
fe3881cf 642 pr_warn("Unexpected LDC event %d\n", event);
4c521e42
DM		 643 spin_unlock_irqrestore(&vio->lock, flags);
644 return;
645 }
646
647 tx_wakeup = err = 0;
648 while (1) {
649 union {
650 struct vio_msg_tag tag;
651 u64 raw[8];
652 } msgbuf;
653
654 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
655 if (unlikely(err < 0)) {
656 if (err == -ECONNRESET)
657 vio_conn_reset(vio);
658 break;
659 }
660 if (err == 0)
661 break;
662 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
663 msgbuf.tag.type,
664 msgbuf.tag.stype,
665 msgbuf.tag.stype_env,
666 msgbuf.tag.sid);
667 err = vio_validate_sid(vio, &msgbuf.tag);
668 if (err < 0)
669 break;
670
671 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
672 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
673 err = vnet_rx(port, &msgbuf);
674 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
675 err = vnet_ack(port, &msgbuf);
676 if (err > 0)
677 tx_wakeup |= err;
678 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
679 err = vnet_nack(port, &msgbuf);
680 }
681 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
028ebff2
DM		 682 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
683 err = handle_mcast(port, &msgbuf);
684 else
685 err = vio_control_pkt_engine(vio, &msgbuf);
4c521e42
DM		 686 if (err)
687 break;
688 } else {
689 err = vnet_handle_unknown(port, &msgbuf);
690 }
691 if (err == -ECONNRESET)
692 break;
693 }
694 spin_unlock(&vio->lock);
1d311ad2
SV		 695 /* Kick off a tasklet to wake the queue. We cannot call
696 * maybe_tx_wakeup directly here because we could deadlock on
697 * netif_tx_lock() with dev_watchdog()
698 */
4c521e42 699 if (unlikely(tx_wakeup && err != -ECONNRESET))
1d311ad2
SV		 700 tasklet_schedule(&port->vp->vnet_tx_wakeup);
701
4c521e42
DM		 702 local_irq_restore(flags);
703}
704
d1015645 705static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
4c521e42
DM		 706{
707 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
708 struct vio_dring_data hdr = {
709 .tag = {
710 .type = VIO_TYPE_DATA,
711 .stype = VIO_SUBTYPE_INFO,
712 .stype_env = VIO_DRING_DATA,
713 .sid = vio_send_sid(&port->vio),
714 },
715 .dring_ident = dr->ident,
d1015645 716 .start_idx = start,
4c521e42
DM		 717 .end_idx = (u32) -1,
718 };
719 int err, delay;
adddc32d 720 int retries = 0;
4c521e42 721
d1015645
SV		 722 if (port->stop_rx) {
723 err = vnet_send_ack(port,
724 &port->vio.drings[VIO_DRIVER_RX_RING],
725 port->stop_rx_idx, -1,
726 VIO_DRING_STOPPED);
727 if (err <= 0)
728 return err;
729 }
730
4c521e42
DM		 731 hdr.seq = dr->snd_nxt;
732 delay = 1;
733 do {
734 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
735 if (err > 0) {
736 dr->snd_nxt++;
737 break;
738 }
739 udelay(delay);
740 if ((delay <<= 1) > 128)
741 delay = 128;
adddc32d
SV		 742 if (retries++ > VNET_MAX_RETRIES)
743 break;
4c521e42
DM		 744 } while (err == -EAGAIN);
745
746 return err;
747}
748
8266f5fc
DS		 749static inline bool port_is_up(struct vnet_port *vnet)
750{
751 struct vio_driver_state *vio = &vnet->vio;
752
753 return !!(vio->hs_state & VIO_HS_COMPLETE);
754}
755
4c521e42
DM		 756struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
757{
758 unsigned int hash = vnet_hashfn(skb->data);
759 struct hlist_head *hp = &vp->port_hash[hash];
4c521e42
DM		 760 struct vnet_port *port;
761
b67bfe0d 762 hlist_for_each_entry(port, hp, hash) {
8266f5fc
DS		 763 if (!port_is_up(port))
764 continue;
2e42e474 765 if (ether_addr_equal(port->raddr, skb->data))
4c521e42
DM		 766 return port;
767 }
8266f5fc
DS		 768 list_for_each_entry(port, &vp->port_list, list) {
769 if (!port->switch_port)
770 continue;
771 if (!port_is_up(port))
772 continue;
773 return port;
774 }
775 return NULL;
4c521e42
DM		 776}
777
778struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
779{
780 struct vnet_port *ret;
781 unsigned long flags;
782
783 spin_lock_irqsave(&vp->lock, flags);
784 ret = __tx_port_find(vp, skb);
785 spin_unlock_irqrestore(&vp->lock, flags);
786
787 return ret;
788}
789
8e845f4c
DS		 790static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
791 unsigned *pending)
792{
793 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
794 struct sk_buff *skb = NULL;
795 int i, txi;
796
797 *pending = 0;
798
799 txi = dr->prod-1;
800 if (txi < 0)
801 txi = VNET_TX_RING_SIZE-1;
802
803 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
804 struct vio_net_desc *d;
805
806 d = vio_dring_entry(dr, txi);
807
808 if (d->hdr.state == VIO_DESC_DONE) {
809 if (port->tx_bufs[txi].skb) {
810 BUG_ON(port->tx_bufs[txi].skb->next);
811
812 port->tx_bufs[txi].skb->next = skb;
813 skb = port->tx_bufs[txi].skb;
814 port->tx_bufs[txi].skb = NULL;
815
816 ldc_unmap(port->vio.lp,
817 port->tx_bufs[txi].cookies,
818 port->tx_bufs[txi].ncookies);
819 }
820 d->hdr.state = VIO_DESC_FREE;
821 } else if (d->hdr.state == VIO_DESC_READY) {
822 (*pending)++;
823 } else if (d->hdr.state == VIO_DESC_FREE) {
824 break;
825 }
826 --txi;
827 if (txi < 0)
828 txi = VNET_TX_RING_SIZE-1;
829 }
830 return skb;
831}
832
833static inline void vnet_free_skbs(struct sk_buff *skb)
834{
835 struct sk_buff *next;
836
837 while (skb) {
838 next = skb->next;
839 skb->next = NULL;
840 dev_kfree_skb(skb);
841 skb = next;
842 }
843}
844
845static void vnet_clean_timer_expire(unsigned long port0)
846{
847 struct vnet_port *port = (struct vnet_port *)port0;
848 struct sk_buff *freeskbs;
849 unsigned pending;
850 unsigned long flags;
851
852 spin_lock_irqsave(&port->vio.lock, flags);
853 freeskbs = vnet_clean_tx_ring(port, &pending);
854 spin_unlock_irqrestore(&port->vio.lock, flags);
855
856 vnet_free_skbs(freeskbs);
857
858 if (pending)
859 (void)mod_timer(&port->clean_timer,
860 jiffies + VNET_CLEAN_TIMEOUT);
861 else
862 del_timer(&port->clean_timer);
863}
864
865static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, void **pstart,
866 int *plen)
867{
868 struct sk_buff *nskb;
869 int len, pad;
870
871 len = skb->len;
872 pad = 0;
873 if (len < ETH_ZLEN) {
874 pad += ETH_ZLEN - skb->len;
875 len += pad;
876 }
877 len += VNET_PACKET_SKIP;
878 pad += 8 - (len & 7);
879 len += 8 - (len & 7);
880
881 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
882 skb_tailroom(skb) < pad ||
883 skb_headroom(skb) < VNET_PACKET_SKIP) {
884 nskb = alloc_and_align_skb(skb->dev, skb->len);
885 skb_reserve(nskb, VNET_PACKET_SKIP);
886 if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
887 dev_kfree_skb(nskb);
888 dev_kfree_skb(skb);
889 return NULL;
890 }
891 (void)skb_put(nskb, skb->len);
892 dev_kfree_skb(skb);
893 skb = nskb;
894 }
895
896 *pstart = skb->data - VNET_PACKET_SKIP;
897 *plen = len;
898 return skb;
899}
900
4c521e42
DM		 901static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
902{
903 struct vnet *vp = netdev_priv(dev);
904 struct vnet_port *port = tx_port_find(vp, skb);
905 struct vio_dring_state *dr;
906 struct vio_net_desc *d;
907 unsigned long flags;
908 unsigned int len;
8e845f4c
DS		 909 struct sk_buff *freeskbs = NULL;
910 int i, err, txi;
911 void *start = NULL;
912 int nlen = 0;
913 unsigned pending = 0;
4c521e42
DM		 914
915 if (unlikely(!port))
916 goto out_dropped;
917
8e845f4c
DS		 918 skb = vnet_skb_shape(skb, &start, &nlen);
919
920 if (unlikely(!skb))
921 goto out_dropped;
922
a2b78e9b
DS		 923 if (skb->len > port->rmtu) {
924 unsigned long localmtu = port->rmtu - ETH_HLEN;
925
926 if (vio_version_after_eq(&port->vio, 1, 3))
927 localmtu -= VLAN_HLEN;
928
929 if (skb->protocol == htons(ETH_P_IP)) {
930 struct flowi4 fl4;
931 struct rtable *rt = NULL;
932
933 memset(&fl4, 0, sizeof(fl4));
934 fl4.flowi4_oif = dev->ifindex;
935 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
936 fl4.daddr = ip_hdr(skb)->daddr;
937 fl4.saddr = ip_hdr(skb)->saddr;
938
939 rt = ip_route_output_key(dev_net(dev), &fl4);
940 if (!IS_ERR(rt)) {
941 skb_dst_set(skb, &rt->dst);
942 icmp_send(skb, ICMP_DEST_UNREACH,
943 ICMP_FRAG_NEEDED,
944 htonl(localmtu));
945 }
946 }
947#if IS_ENABLED(CONFIG_IPV6)
948 else if (skb->protocol == htons(ETH_P_IPV6))
949 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
950#endif
42db672d 951 goto out_dropped;
a2b78e9b 952 }
42db672d 953
4c521e42
DM		 954 spin_lock_irqsave(&port->vio.lock, flags);
955
956 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
d0aedcd4 957 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
4c521e42
DM		 958 if (!netif_queue_stopped(dev)) {
959 netif_stop_queue(dev);
960
961 /* This is a hard error, log it. */
4d5870ec 962 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
4c521e42
DM		 963 dev->stats.tx_errors++;
964 }
965 spin_unlock_irqrestore(&port->vio.lock, flags);
966 return NETDEV_TX_BUSY;
967 }
968
969 d = vio_dring_cur(dr);
970
8e845f4c
DS		 971 txi = dr->prod;
972
973 freeskbs = vnet_clean_tx_ring(port, &pending);
974
975 BUG_ON(port->tx_bufs[txi].skb);
4c521e42
DM		 976
977 len = skb->len;
8e845f4c 978 if (len < ETH_ZLEN)
4c521e42 979 len = ETH_ZLEN;
8e845f4c
DS		 980
981 port->tx_bufs[txi].skb = skb;
982 skb = NULL;
983
984 err = ldc_map_single(port->vio.lp, start, nlen,
42db672d 985 port->tx_bufs[txi].cookies, VNET_MAXCOOKIES,
8e845f4c
DS		 986 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
987 if (err < 0) {
988 netdev_info(dev, "tx buffer map error %d\n", err);
989 goto out_dropped_unlock;
4c521e42 990 }
8e845f4c 991 port->tx_bufs[txi].ncookies = err;
4c521e42 992
1f6394e3
SV		 993 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
994 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
995 * the protocol itself does not require it as long as the peer
996 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
997 *
998 * An ACK for every packet in the ring is expensive as the
999 * sending of LDC messages is slow and affects performance.
1000 */
1001 d->hdr.ack = VIO_ACK_DISABLE;
4c521e42 1002 d->size = len;
8e845f4c 1003 d->ncookies = port->tx_bufs[txi].ncookies;
4c521e42 1004 for (i = 0; i < d->ncookies; i++)
8e845f4c 1005 d->cookies[i] = port->tx_bufs[txi].cookies[i];
4c521e42
DM		 1006
1007 /* This has to be a non-SMP write barrier because we are writing
1008 * to memory which is shared with the peer LDOM.
1009 */
1010 wmb();
1011
1012 d->hdr.state = VIO_DESC_READY;
1013
d1015645
SV		 1014 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1015 * to notify the consumer that some descriptors are READY.
1016 * After that "start" trigger, no additional triggers are needed until
1017 * a DRING_STOPPED is received from the consumer. The dr->cons field
1018 * (set up by vnet_ack()) has the value of the next dring index
1019 * that has not yet been ack-ed. We send a "start" trigger here
1020 * if, and only if, start_cons is true (reset it afterward). Conversely,
1021 * vnet_ack() should check if the dring corresponding to cons
1022 * is marked READY, but start_cons was false.
1023 * If so, vnet_ack() should send out the missed "start" trigger.
1024 *
1025 * Note that the wmb() above makes sure the cookies et al. are
1026 * not globally visible before the VIO_DESC_READY, and that the
1027 * stores are ordered correctly by the compiler. The consumer will
1028 * not proceed until the VIO_DESC_READY is visible assuring that
1029 * the consumer does not observe anything related to descriptors
1030 * out of order. The HV trap from the LDC start trigger is the
1031 * producer to consumer announcement that work is available to the
1032 * consumer
1033 */
1034 if (!port->start_cons)
1035 goto ldc_start_done; /* previous trigger suffices */
1036
1037 err = __vnet_tx_trigger(port, dr->cons);
4c521e42 1038 if (unlikely(err < 0)) {
4d5870ec 1039 netdev_info(dev, "TX trigger error %d\n", err);
4c521e42
DM		 1040 d->hdr.state = VIO_DESC_FREE;
1041 dev->stats.tx_carrier_errors++;
1042 goto out_dropped_unlock;
1043 }
1044
d1015645
SV		 1045ldc_start_done:
1046 port->start_cons = false;
1047
4c521e42 1048 dev->stats.tx_packets++;
8e845f4c 1049 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
4c521e42
DM		 1050
1051 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
d0aedcd4 1052 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
4c521e42
DM		 1053 netif_stop_queue(dev);
1054 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1055 netif_wake_queue(dev);
1056 }
1057
1058 spin_unlock_irqrestore(&port->vio.lock, flags);
1059
8e845f4c
DS		 1060 vnet_free_skbs(freeskbs);
1061
1062 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
4c521e42 1063
4c521e42
DM		 1064 return NETDEV_TX_OK;
1065
1066out_dropped_unlock:
1067 spin_unlock_irqrestore(&port->vio.lock, flags);
1068
1069out_dropped:
8e845f4c
DS		 1070 if (skb)
1071 dev_kfree_skb(skb);
1072 vnet_free_skbs(freeskbs);
1073 if (pending)
1074 (void)mod_timer(&port->clean_timer,
1075 jiffies + VNET_CLEAN_TIMEOUT);
a29c9c43 1076 else if (port)
8e845f4c 1077 del_timer(&port->clean_timer);
4c521e42
DM		 1078 dev->stats.tx_dropped++;
1079 return NETDEV_TX_OK;
1080}
1081
1082static void vnet_tx_timeout(struct net_device *dev)
1083{
1084 /* XXX Implement me XXX */
1085}
1086
1087static int vnet_open(struct net_device *dev)
1088{
1089 netif_carrier_on(dev);
1090 netif_start_queue(dev);
1091
1092 return 0;
1093}
1094
1095static int vnet_close(struct net_device *dev)
1096{
1097 netif_stop_queue(dev);
1098 netif_carrier_off(dev);
1099
1100 return 0;
1101}
1102
028ebff2
DM		 1103static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1104{
1105 struct vnet_mcast_entry *m;
1106
1107 for (m = vp->mcast_list; m; m = m->next) {
00fa4ce9 1108 if (ether_addr_equal(m->addr, addr))
028ebff2
DM		 1109 return m;
1110 }
1111 return NULL;
1112}
1113
1114static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1115{
22bedad3 1116 struct netdev_hw_addr *ha;
028ebff2 1117
22bedad3 1118 netdev_for_each_mc_addr(ha, dev) {
028ebff2
DM		 1119 struct vnet_mcast_entry *m;
1120
22bedad3 1121 m = __vnet_mc_find(vp, ha->addr);
028ebff2
DM		 1122 if (m) {
1123 m->hit = 1;
1124 continue;
1125 }
1126
1127 if (!m) {
1128 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1129 if (!m)
1130 continue;
22bedad3 1131 memcpy(m->addr, ha->addr, ETH_ALEN);
028ebff2
DM		 1132 m->hit = 1;
1133
1134 m->next = vp->mcast_list;
1135 vp->mcast_list = m;
1136 }
1137 }
1138}
1139
1140static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1141{
1142 struct vio_net_mcast_info info;
1143 struct vnet_mcast_entry *m, **pp;
1144 int n_addrs;
1145
1146 memset(&info, 0, sizeof(info));
1147
1148 info.tag.type = VIO_TYPE_CTRL;
1149 info.tag.stype = VIO_SUBTYPE_INFO;
1150 info.tag.stype_env = VNET_MCAST_INFO;
1151 info.tag.sid = vio_send_sid(&port->vio);
1152 info.set = 1;
1153
1154 n_addrs = 0;
1155 for (m = vp->mcast_list; m; m = m->next) {
1156 if (m->sent)
1157 continue;
1158 m->sent = 1;
1159 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1160 m->addr, ETH_ALEN);
1161 if (++n_addrs == VNET_NUM_MCAST) {
1162 info.count = n_addrs;
1163
1164 (void) vio_ldc_send(&port->vio, &info,
1165 sizeof(info));
1166 n_addrs = 0;
1167 }
1168 }
1169 if (n_addrs) {
1170 info.count = n_addrs;
1171 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1172 }
1173
1174 info.set = 0;
1175
1176 n_addrs = 0;
1177 pp = &vp->mcast_list;
1178 while ((m = *pp) != NULL) {
1179 if (m->hit) {
1180 m->hit = 0;
1181 pp = &m->next;
1182 continue;
1183 }
1184
1185 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1186 m->addr, ETH_ALEN);
1187 if (++n_addrs == VNET_NUM_MCAST) {
1188 info.count = n_addrs;
1189 (void) vio_ldc_send(&port->vio, &info,
1190 sizeof(info));
1191 n_addrs = 0;
1192 }
1193
1194 *pp = m->next;
1195 kfree(m);
1196 }
1197 if (n_addrs) {
1198 info.count = n_addrs;
1199 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1200 }
1201}
1202
4c521e42
DM		 1203static void vnet_set_rx_mode(struct net_device *dev)
1204{
028ebff2
DM		 1205 struct vnet *vp = netdev_priv(dev);
1206 struct vnet_port *port;
1207 unsigned long flags;
1208
1209 spin_lock_irqsave(&vp->lock, flags);
1210 if (!list_empty(&vp->port_list)) {
1211 port = list_entry(vp->port_list.next, struct vnet_port, list);
1212
1213 if (port->switch_port) {
1214 __update_mc_list(vp, dev);
1215 __send_mc_list(vp, port);
1216 }
1217 }
1218 spin_unlock_irqrestore(&vp->lock, flags);
4c521e42
DM		 1219}
1220
1221static int vnet_change_mtu(struct net_device *dev, int new_mtu)
1222{
42db672d 1223 if (new_mtu < 68 || new_mtu > 65535)
4c521e42
DM		 1224 return -EINVAL;
1225
1226 dev->mtu = new_mtu;
1227 return 0;
1228}
1229
1230static int vnet_set_mac_addr(struct net_device *dev, void *p)
1231{
1232 return -EINVAL;
1233}
1234
1235static void vnet_get_drvinfo(struct net_device *dev,
1236 struct ethtool_drvinfo *info)
1237{
7826d43f
JP		 1238 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
1239 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
4c521e42
DM		 1240}
1241
1242static u32 vnet_get_msglevel(struct net_device *dev)
1243{
1244 struct vnet *vp = netdev_priv(dev);
1245 return vp->msg_enable;
1246}
1247
1248static void vnet_set_msglevel(struct net_device *dev, u32 value)
1249{
1250 struct vnet *vp = netdev_priv(dev);
1251 vp->msg_enable = value;
1252}
1253
1254static const struct ethtool_ops vnet_ethtool_ops = {
1255 .get_drvinfo = vnet_get_drvinfo,
1256 .get_msglevel = vnet_get_msglevel,
1257 .set_msglevel = vnet_set_msglevel,
1258 .get_link = ethtool_op_get_link,
4c521e42
DM		 1259};
1260
1261static void vnet_port_free_tx_bufs(struct vnet_port *port)
1262{
1263 struct vio_dring_state *dr;
1264 int i;
1265
1266 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1267 if (dr->base) {
1268 ldc_free_exp_dring(port->vio.lp, dr->base,
1269 (dr->entry_size * dr->num_entries),
1270 dr->cookies, dr->ncookies);
1271 dr->base = NULL;
1272 dr->entry_size = 0;
1273 dr->num_entries = 0;
1274 dr->pending = 0;
1275 dr->ncookies = 0;
1276 }
1277
1278 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
8e845f4c
DS		 1279 struct vio_net_desc *d;
1280 void *skb = port->tx_bufs[i].skb;
4c521e42 1281
8e845f4c 1282 if (!skb)
4c521e42
DM		 1283 continue;
1284
8e845f4c
DS		 1285 d = vio_dring_entry(dr, i);
1286 if (d->hdr.state == VIO_DESC_READY)
1287 pr_warn("active transmit buffers freed\n");
1288
4c521e42
DM		 1289 ldc_unmap(port->vio.lp,
1290 port->tx_bufs[i].cookies,
1291 port->tx_bufs[i].ncookies);
8e845f4c
DS		 1292 dev_kfree_skb(skb);
1293 port->tx_bufs[i].skb = NULL;
1294 d->hdr.state = VIO_DESC_FREE;
4c521e42
DM		 1295 }
1296}
1297
f73d12bd 1298static int vnet_port_alloc_tx_bufs(struct vnet_port *port)
4c521e42
DM		 1299{
1300 struct vio_dring_state *dr;
1301 unsigned long len;
1302 int i, err, ncookies;
1303 void *dring;
1304
4c521e42
DM		 1305 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1306
1307 len = (VNET_TX_RING_SIZE *
1308 (sizeof(struct vio_net_desc) +
1309 (sizeof(struct ldc_trans_cookie) * 2)));
1310
1311 ncookies = VIO_MAX_RING_COOKIES;
1312 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1313 dr->cookies, &ncookies,
1314 (LDC_MAP_SHADOW |
1315 LDC_MAP_DIRECT |
1316 LDC_MAP_RW));
1317 if (IS_ERR(dring)) {
1318 err = PTR_ERR(dring);
1319 goto err_out;
1320 }
1321
1322 dr->base = dring;
1323 dr->entry_size = (sizeof(struct vio_net_desc) +
1324 (sizeof(struct ldc_trans_cookie) * 2));
1325 dr->num_entries = VNET_TX_RING_SIZE;
1326 dr->prod = dr->cons = 0;
d1015645 1327 port->start_cons = true; /* need an initial trigger */
4c521e42
DM		 1328 dr->pending = VNET_TX_RING_SIZE;
1329 dr->ncookies = ncookies;
1330
8e845f4c
DS		 1331 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1332 struct vio_net_desc *d;
1333
1334 d = vio_dring_entry(dr, i);
1335 d->hdr.state = VIO_DESC_FREE;
1336 }
4c521e42
DM		 1337 return 0;
1338
1339err_out:
1340 vnet_port_free_tx_bufs(port);
1341
1342 return err;
1343}
1344
9184a046
DM		 1345static LIST_HEAD(vnet_list);
1346static DEFINE_MUTEX(vnet_list_mutex);
1347
8fd17f2e
DM		 1348static const struct net_device_ops vnet_ops = {
1349 .ndo_open = vnet_open,
1350 .ndo_stop = vnet_close,
afc4b13d 1351 .ndo_set_rx_mode = vnet_set_rx_mode,
8fd17f2e 1352 .ndo_set_mac_address = vnet_set_mac_addr,
240c102d 1353 .ndo_validate_addr = eth_validate_addr,
8fd17f2e
DM		 1354 .ndo_tx_timeout = vnet_tx_timeout,
1355 .ndo_change_mtu = vnet_change_mtu,
1356 .ndo_start_xmit = vnet_start_xmit,
1357};
1358
f73d12bd 1359static struct vnet *vnet_new(const u64 *local_mac)
9184a046
DM		 1360{
1361 struct net_device *dev;
1362 struct vnet *vp;
1363 int err, i;
1364
1365 dev = alloc_etherdev(sizeof(*vp));
41de8d4c 1366 if (!dev)
9184a046 1367 return ERR_PTR(-ENOMEM);
8e845f4c
DS		 1368 dev->needed_headroom = VNET_PACKET_SKIP + 8;
1369 dev->needed_tailroom = 8;
9184a046
DM		 1370
1371 for (i = 0; i < ETH_ALEN; i++)
1372 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1373
9184a046
DM		 1374 vp = netdev_priv(dev);
1375
1376 spin_lock_init(&vp->lock);
1d311ad2 1377 tasklet_init(&vp->vnet_tx_wakeup, maybe_tx_wakeup, (unsigned long)vp);
9184a046
DM		 1378 vp->dev = dev;
1379
1380 INIT_LIST_HEAD(&vp->port_list);
1381 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1382 INIT_HLIST_HEAD(&vp->port_hash[i]);
1383 INIT_LIST_HEAD(&vp->list);
1384 vp->local_mac = *local_mac;
1385
8fd17f2e 1386 dev->netdev_ops = &vnet_ops;
9184a046
DM		 1387 dev->ethtool_ops = &vnet_ethtool_ops;
1388 dev->watchdog_timeo = VNET_TX_TIMEOUT;
9184a046
DM		 1389
1390 err = register_netdev(dev);
1391 if (err) {
4d5870ec 1392 pr_err("Cannot register net device, aborting\n");
9184a046
DM		 1393 goto err_out_free_dev;
1394 }
1395
4d5870ec 1396 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
9184a046
DM		 1397
1398 list_add(&vp->list, &vnet_list);
1399
1400 return vp;
1401
1402err_out_free_dev:
1403 free_netdev(dev);
1404
1405 return ERR_PTR(err);
1406}
1407
f73d12bd 1408static struct vnet *vnet_find_or_create(const u64 *local_mac)
9184a046
DM		 1409{
1410 struct vnet *iter, *vp;
1411
1412 mutex_lock(&vnet_list_mutex);
1413 vp = NULL;
1414 list_for_each_entry(iter, &vnet_list, list) {
1415 if (iter->local_mac == *local_mac) {
1416 vp = iter;
1417 break;
1418 }
1419 }
1420 if (!vp)
1421 vp = vnet_new(local_mac);
1422 mutex_unlock(&vnet_list_mutex);
1423
1424 return vp;
1425}
1426
a4b70a07
SV		 1427static void vnet_cleanup(void)
1428{
1429 struct vnet *vp;
1430 struct net_device *dev;
1431
1432 mutex_lock(&vnet_list_mutex);
1433 while (!list_empty(&vnet_list)) {
1434 vp = list_first_entry(&vnet_list, struct vnet, list);
1435 list_del(&vp->list);
1436 dev = vp->dev;
1d311ad2 1437 tasklet_kill(&vp->vnet_tx_wakeup);
a4b70a07
SV		 1438 /* vio_unregister_driver() should have cleaned up port_list */
1439 BUG_ON(!list_empty(&vp->port_list));
1440 unregister_netdev(dev);
1441 free_netdev(dev);
1442 }
1443 mutex_unlock(&vnet_list_mutex);
1444}
1445
9184a046
DM		 1446static const char *local_mac_prop = "local-mac-address";
1447
f73d12bd 1448static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
9184a046
DM		 1449 u64 port_node)
1450{
1451 const u64 *local_mac = NULL;
1452 u64 a;
1453
1454 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1455 u64 target = mdesc_arc_target(hp, a);
1456 const char *name;
1457
1458 name = mdesc_get_property(hp, target, "name", NULL);
1459 if (!name || strcmp(name, "network"))
1460 continue;
1461
1462 local_mac = mdesc_get_property(hp, target,
1463 local_mac_prop, NULL);
1464 if (local_mac)
1465 break;
1466 }
1467 if (!local_mac)
1468 return ERR_PTR(-ENODEV);
1469
1470 return vnet_find_or_create(local_mac);
1471}
1472
4c521e42
DM		 1473static struct ldc_channel_config vnet_ldc_cfg = {
1474 .event = vnet_event,
1475 .mtu = 64,
1476 .mode = LDC_MODE_UNRELIABLE,
1477};
1478
1479static struct vio_driver_ops vnet_vio_ops = {
1480 .send_attr = vnet_send_attr,
1481 .handle_attr = vnet_handle_attr,
1482 .handshake_complete = vnet_handshake_complete,
1483};
1484
f73d12bd 1485static void print_version(void)
9184a046 1486{
4d5870ec 1487 printk_once(KERN_INFO "%s", version);
9184a046
DM		 1488}
1489
4c521e42
DM		 1490const char *remote_macaddr_prop = "remote-mac-address";
1491
1dd06ae8 1492static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4c521e42 1493{
43fdf274 1494 struct mdesc_handle *hp;
4c521e42
DM		 1495 struct vnet_port *port;
1496 unsigned long flags;
1497 struct vnet *vp;
1498 const u64 *rmac;
1499 int len, i, err, switch_port;
1500
9184a046 1501 print_version();
4c521e42 1502
43fdf274
DM		 1503 hp = mdesc_grab();
1504
9184a046
DM		 1505 vp = vnet_find_parent(hp, vdev->mp);
1506 if (IS_ERR(vp)) {
4d5870ec 1507 pr_err("Cannot find port parent vnet\n");
9184a046
DM		 1508 err = PTR_ERR(vp);
1509 goto err_out_put_mdesc;
1510 }
1511
43fdf274
DM		 1512 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1513 err = -ENODEV;
4c521e42 1514 if (!rmac) {
4d5870ec 1515 pr_err("Port lacks %s property\n", remote_macaddr_prop);
43fdf274 1516 goto err_out_put_mdesc;
4c521e42
DM		 1517 }
1518
1519 port = kzalloc(sizeof(*port), GFP_KERNEL);
43fdf274 1520 err = -ENOMEM;
e404decb 1521 if (!port)
43fdf274 1522 goto err_out_put_mdesc;
4c521e42
DM		 1523
1524 for (i = 0; i < ETH_ALEN; i++)
1525 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1526
1527 port->vp = vp;
1528
43fdf274 1529 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
4c521e42
DM		 1530 vnet_versions, ARRAY_SIZE(vnet_versions),
1531 &vnet_vio_ops, vp->dev->name);
1532 if (err)
1533 goto err_out_free_port;
1534
1535 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1536 if (err)
1537 goto err_out_free_port;
1538
1539 err = vnet_port_alloc_tx_bufs(port);
1540 if (err)
1541 goto err_out_free_ldc;
1542
1543 INIT_HLIST_NODE(&port->hash);
1544 INIT_LIST_HEAD(&port->list);
1545
1546 switch_port = 0;
43fdf274 1547 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
4c521e42 1548 switch_port = 1;
028ebff2 1549 port->switch_port = switch_port;
4c521e42
DM		 1550
1551 spin_lock_irqsave(&vp->lock, flags);
1552 if (switch_port)
1553 list_add(&port->list, &vp->port_list);
1554 else
1555 list_add_tail(&port->list, &vp->port_list);
1556 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1557 spin_unlock_irqrestore(&vp->lock, flags);
1558
1559 dev_set_drvdata(&vdev->dev, port);
1560
4d5870ec
JP		 1561 pr_info("%s: PORT ( remote-mac %pM%s )\n",
1562 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
4c521e42 1563
8e845f4c
DS		 1564 setup_timer(&port->clean_timer, vnet_clean_timer_expire,
1565 (unsigned long)port);
1566
4c521e42
DM		 1567 vio_port_up(&port->vio);
1568
43fdf274
DM		 1569 mdesc_release(hp);
1570
4c521e42
DM		 1571 return 0;
1572
1573err_out_free_ldc:
1574 vio_ldc_free(&port->vio);
1575
1576err_out_free_port:
1577 kfree(port);
1578
43fdf274
DM		 1579err_out_put_mdesc:
1580 mdesc_release(hp);
4c521e42
DM		 1581 return err;
1582}
1583
1584static int vnet_port_remove(struct vio_dev *vdev)
1585{
1586 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1587
1588 if (port) {
1589 struct vnet *vp = port->vp;
1590 unsigned long flags;
1591
1592 del_timer_sync(&port->vio.timer);
8e845f4c 1593 del_timer_sync(&port->clean_timer);
4c521e42
DM		 1594
1595 spin_lock_irqsave(&vp->lock, flags);
1596 list_del(&port->list);
1597 hlist_del(&port->hash);
1598 spin_unlock_irqrestore(&vp->lock, flags);
1599
1600 vnet_port_free_tx_bufs(port);
1601 vio_ldc_free(&port->vio);
1602
1603 dev_set_drvdata(&vdev->dev, NULL);
1604
1605 kfree(port);
aabb9875 1606
4c521e42
DM		 1607 }
1608 return 0;
1609}
1610
3d452e55 1611static const struct vio_device_id vnet_port_match[] = {
4c521e42
DM		 1612 {
1613 .type = "vnet-port",
1614 },
1615 {},
1616};
da68e081 1617MODULE_DEVICE_TABLE(vio, vnet_port_match);
4c521e42
DM		 1618
1619static struct vio_driver vnet_port_driver = {
1620 .id_table = vnet_port_match,
1621 .probe = vnet_port_probe,
1622 .remove = vnet_port_remove,
cb52d897 1623 .name = "vnet_port",
4c521e42
DM		 1624};
1625
4c521e42
DM		 1626static int __init vnet_init(void)
1627{
9184a046 1628 return vio_register_driver(&vnet_port_driver);
4c521e42
DM		 1629}
1630
1631static void __exit vnet_exit(void)
1632{
1633 vio_unregister_driver(&vnet_port_driver);
a4b70a07 1634 vnet_cleanup();
4c521e42
DM		 1635}
1636
1637module_init(vnet_init);
1638module_exit(vnet_exit);
Linux kernel - Deliverables
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