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Merge tag 'md/3.19' of git://neil.brown.name/md
[deliverable/linux.git] / drivers / net / ethernet / sun / sunvnet.c
1 /* sunvnet.c: Sun LDOM Virtual Network Driver.
2 *
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
4 */
5
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
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>
17 #include <linux/mutex.h>
18 #include <linux/highmem.h>
19 #include <linux/if_vlan.h>
20
21 #if IS_ENABLED(CONFIG_IPV6)
22 #include <linux/icmpv6.h>
23 #endif
24
25 #include <net/ip.h>
26 #include <net/icmp.h>
27 #include <net/route.h>
28
29 #include <asm/vio.h>
30 #include <asm/ldc.h>
31
32 #include "sunvnet.h"
33
34 #define DRV_MODULE_NAME "sunvnet"
35 #define DRV_MODULE_VERSION "1.0"
36 #define DRV_MODULE_RELDATE "June 25, 2007"
37
38 static char version[] =
39 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
40 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
41 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
42 MODULE_LICENSE("GPL");
43 MODULE_VERSION(DRV_MODULE_VERSION);
44
45 #define VNET_MAX_TXQS 16
46
47 /* Heuristic for the number of times to exponentially backoff and
48 * retry sending an LDC trigger when EAGAIN is encountered
49 */
50 #define VNET_MAX_RETRIES 10
51
52 static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
53
54 /* Ordered from largest major to lowest */
55 static struct vio_version vnet_versions[] = {
56 { .major = 1, .minor = 8 },
57 { .major = 1, .minor = 7 },
58 { .major = 1, .minor = 6 },
59 { .major = 1, .minor = 0 },
60 };
61
62 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
63 {
64 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
65 }
66
67 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
68 {
69 struct vio_msg_tag *pkt = arg;
70
71 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
72 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
73 pr_err("Resetting connection\n");
74
75 ldc_disconnect(port->vio.lp);
76
77 return -ECONNRESET;
78 }
79
80 static int vnet_port_alloc_tx_ring(struct vnet_port *port);
81
82 static int vnet_send_attr(struct vio_driver_state *vio)
83 {
84 struct vnet_port *port = to_vnet_port(vio);
85 struct net_device *dev = port->vp->dev;
86 struct vio_net_attr_info pkt;
87 int framelen = ETH_FRAME_LEN;
88 int i, err;
89
90 err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
91 if (err)
92 return err;
93
94 memset(&pkt, 0, sizeof(pkt));
95 pkt.tag.type = VIO_TYPE_CTRL;
96 pkt.tag.stype = VIO_SUBTYPE_INFO;
97 pkt.tag.stype_env = VIO_ATTR_INFO;
98 pkt.tag.sid = vio_send_sid(vio);
99 if (vio_version_before(vio, 1, 2))
100 pkt.xfer_mode = VIO_DRING_MODE;
101 else
102 pkt.xfer_mode = VIO_NEW_DRING_MODE;
103 pkt.addr_type = VNET_ADDR_ETHERMAC;
104 pkt.ack_freq = 0;
105 for (i = 0; i < 6; i++)
106 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
107 if (vio_version_after(vio, 1, 3)) {
108 if (port->rmtu) {
109 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
110 pkt.mtu = port->rmtu;
111 } else {
112 port->rmtu = VNET_MAXPACKET;
113 pkt.mtu = port->rmtu;
114 }
115 if (vio_version_after_eq(vio, 1, 6))
116 pkt.options = VIO_TX_DRING;
117 } else if (vio_version_before(vio, 1, 3)) {
118 pkt.mtu = framelen;
119 } else { /* v1.3 */
120 pkt.mtu = framelen + VLAN_HLEN;
121 }
122
123 pkt.cflags = 0;
124 if (vio_version_after_eq(vio, 1, 7) && port->tso) {
125 pkt.cflags |= VNET_LSO_IPV4_CAPAB;
126 if (!port->tsolen)
127 port->tsolen = VNET_MAXTSO;
128 pkt.ipv4_lso_maxlen = port->tsolen;
129 }
130
131 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
132
133 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
134 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
135 "cflags[0x%04x] lso_max[%u]\n",
136 pkt.xfer_mode, pkt.addr_type,
137 (unsigned long long)pkt.addr,
138 pkt.ack_freq, pkt.plnk_updt, pkt.options,
139 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
140
141
142 return vio_ldc_send(vio, &pkt, sizeof(pkt));
143 }
144
145 static int handle_attr_info(struct vio_driver_state *vio,
146 struct vio_net_attr_info *pkt)
147 {
148 struct vnet_port *port = to_vnet_port(vio);
149 u64 localmtu;
150 u8 xfer_mode;
151
152 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
153 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
154 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
155 pkt->xfer_mode, pkt->addr_type,
156 (unsigned long long)pkt->addr,
157 pkt->ack_freq, pkt->plnk_updt, pkt->options,
158 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
159 pkt->ipv4_lso_maxlen);
160
161 pkt->tag.sid = vio_send_sid(vio);
162
163 xfer_mode = pkt->xfer_mode;
164 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
165 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
166 xfer_mode = VIO_NEW_DRING_MODE;
167
168 /* MTU negotiation:
169 * < v1.3 - ETH_FRAME_LEN exactly
170 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
171 * pkt->mtu for ACK
172 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
173 */
174 if (vio_version_before(vio, 1, 3)) {
175 localmtu = ETH_FRAME_LEN;
176 } else if (vio_version_after(vio, 1, 3)) {
177 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
178 localmtu = min(pkt->mtu, localmtu);
179 pkt->mtu = localmtu;
180 } else { /* v1.3 */
181 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
182 }
183 port->rmtu = localmtu;
184
185 /* LSO negotiation */
186 if (vio_version_after_eq(vio, 1, 7))
187 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
188 else
189 port->tso = false;
190 if (port->tso) {
191 if (!port->tsolen)
192 port->tsolen = VNET_MAXTSO;
193 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
194 if (port->tsolen < VNET_MINTSO) {
195 port->tso = false;
196 port->tsolen = 0;
197 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
198 }
199 pkt->ipv4_lso_maxlen = port->tsolen;
200 } else {
201 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
202 pkt->ipv4_lso_maxlen = 0;
203 }
204
205 /* for version >= 1.6, ACK packet mode we support */
206 if (vio_version_after_eq(vio, 1, 6)) {
207 pkt->xfer_mode = VIO_NEW_DRING_MODE;
208 pkt->options = VIO_TX_DRING;
209 }
210
211 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
212 pkt->addr_type != VNET_ADDR_ETHERMAC ||
213 pkt->mtu != localmtu) {
214 viodbg(HS, "SEND NET ATTR NACK\n");
215
216 pkt->tag.stype = VIO_SUBTYPE_NACK;
217
218 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
219
220 return -ECONNRESET;
221 } else {
222 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
223 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
224 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
225 pkt->xfer_mode, pkt->addr_type,
226 (unsigned long long)pkt->addr,
227 pkt->ack_freq, pkt->plnk_updt, pkt->options,
228 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
229 pkt->ipv4_lso_maxlen);
230
231 pkt->tag.stype = VIO_SUBTYPE_ACK;
232
233 return vio_ldc_send(vio, pkt, sizeof(*pkt));
234 }
235
236 }
237
238 static int handle_attr_ack(struct vio_driver_state *vio,
239 struct vio_net_attr_info *pkt)
240 {
241 viodbg(HS, "GOT NET ATTR ACK\n");
242
243 return 0;
244 }
245
246 static int handle_attr_nack(struct vio_driver_state *vio,
247 struct vio_net_attr_info *pkt)
248 {
249 viodbg(HS, "GOT NET ATTR NACK\n");
250
251 return -ECONNRESET;
252 }
253
254 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
255 {
256 struct vio_net_attr_info *pkt = arg;
257
258 switch (pkt->tag.stype) {
259 case VIO_SUBTYPE_INFO:
260 return handle_attr_info(vio, pkt);
261
262 case VIO_SUBTYPE_ACK:
263 return handle_attr_ack(vio, pkt);
264
265 case VIO_SUBTYPE_NACK:
266 return handle_attr_nack(vio, pkt);
267
268 default:
269 return -ECONNRESET;
270 }
271 }
272
273 static void vnet_handshake_complete(struct vio_driver_state *vio)
274 {
275 struct vio_dring_state *dr;
276
277 dr = &vio->drings[VIO_DRIVER_RX_RING];
278 dr->snd_nxt = dr->rcv_nxt = 1;
279
280 dr = &vio->drings[VIO_DRIVER_TX_RING];
281 dr->snd_nxt = dr->rcv_nxt = 1;
282 }
283
284 /* The hypervisor interface that implements copying to/from imported
285 * memory from another domain requires that copies are done to 8-byte
286 * aligned buffers, and that the lengths of such copies are also 8-byte
287 * multiples.
288 *
289 * So we align skb->data to an 8-byte multiple and pad-out the data
290 * area so we can round the copy length up to the next multiple of
291 * 8 for the copy.
292 *
293 * The transmitter puts the actual start of the packet 6 bytes into
294 * the buffer it sends over, so that the IP headers after the ethernet
295 * header are aligned properly. These 6 bytes are not in the descriptor
296 * length, they are simply implied. This offset is represented using
297 * the VNET_PACKET_SKIP macro.
298 */
299 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
300 unsigned int len)
301 {
302 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
303 unsigned long addr, off;
304
305 if (unlikely(!skb))
306 return NULL;
307
308 addr = (unsigned long) skb->data;
309 off = ((addr + 7UL) & ~7UL) - addr;
310 if (off)
311 skb_reserve(skb, off);
312
313 return skb;
314 }
315
316 static inline void vnet_fullcsum(struct sk_buff *skb)
317 {
318 struct iphdr *iph = ip_hdr(skb);
319 int offset = skb_transport_offset(skb);
320
321 if (skb->protocol != htons(ETH_P_IP))
322 return;
323 if (iph->protocol != IPPROTO_TCP &&
324 iph->protocol != IPPROTO_UDP)
325 return;
326 skb->ip_summed = CHECKSUM_NONE;
327 skb->csum_level = 1;
328 skb->csum = 0;
329 if (iph->protocol == IPPROTO_TCP) {
330 struct tcphdr *ptcp = tcp_hdr(skb);
331
332 ptcp->check = 0;
333 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
334 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
335 skb->len - offset, IPPROTO_TCP,
336 skb->csum);
337 } else if (iph->protocol == IPPROTO_UDP) {
338 struct udphdr *pudp = udp_hdr(skb);
339
340 pudp->check = 0;
341 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
342 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
343 skb->len - offset, IPPROTO_UDP,
344 skb->csum);
345 }
346 }
347
348 static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
349 {
350 struct net_device *dev = port->vp->dev;
351 unsigned int len = desc->size;
352 unsigned int copy_len;
353 struct sk_buff *skb;
354 int err;
355
356 err = -EMSGSIZE;
357 if (unlikely(len < ETH_ZLEN || len > port->rmtu)) {
358 dev->stats.rx_length_errors++;
359 goto out_dropped;
360 }
361
362 skb = alloc_and_align_skb(dev, len);
363 err = -ENOMEM;
364 if (unlikely(!skb)) {
365 dev->stats.rx_missed_errors++;
366 goto out_dropped;
367 }
368
369 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
370 skb_put(skb, copy_len);
371 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
372 skb->data, copy_len, 0,
373 desc->cookies, desc->ncookies);
374 if (unlikely(err < 0)) {
375 dev->stats.rx_frame_errors++;
376 goto out_free_skb;
377 }
378
379 skb_pull(skb, VNET_PACKET_SKIP);
380 skb_trim(skb, len);
381 skb->protocol = eth_type_trans(skb, dev);
382
383 if (vio_version_after_eq(&port->vio, 1, 8)) {
384 struct vio_net_dext *dext = vio_net_ext(desc);
385
386 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
387 if (skb->protocol == ETH_P_IP) {
388 struct iphdr *iph = (struct iphdr *)skb->data;
389
390 iph->check = 0;
391 ip_send_check(iph);
392 }
393 }
394 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
395 skb->ip_summed == CHECKSUM_NONE)
396 vnet_fullcsum(skb);
397 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
398 skb->ip_summed = CHECKSUM_PARTIAL;
399 skb->csum_level = 0;
400 if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
401 skb->csum_level = 1;
402 }
403 }
404
405 skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
406
407 dev->stats.rx_packets++;
408 dev->stats.rx_bytes += len;
409 napi_gro_receive(&port->napi, skb);
410 return 0;
411
412 out_free_skb:
413 kfree_skb(skb);
414
415 out_dropped:
416 dev->stats.rx_dropped++;
417 return err;
418 }
419
420 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
421 u32 start, u32 end, u8 vio_dring_state)
422 {
423 struct vio_dring_data hdr = {
424 .tag = {
425 .type = VIO_TYPE_DATA,
426 .stype = VIO_SUBTYPE_ACK,
427 .stype_env = VIO_DRING_DATA,
428 .sid = vio_send_sid(&port->vio),
429 },
430 .dring_ident = dr->ident,
431 .start_idx = start,
432 .end_idx = end,
433 .state = vio_dring_state,
434 };
435 int err, delay;
436 int retries = 0;
437
438 hdr.seq = dr->snd_nxt;
439 delay = 1;
440 do {
441 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
442 if (err > 0) {
443 dr->snd_nxt++;
444 break;
445 }
446 udelay(delay);
447 if ((delay <<= 1) > 128)
448 delay = 128;
449 if (retries++ > VNET_MAX_RETRIES) {
450 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
451 port->raddr[0], port->raddr[1],
452 port->raddr[2], port->raddr[3],
453 port->raddr[4], port->raddr[5]);
454 break;
455 }
456 } while (err == -EAGAIN);
457
458 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
459 port->stop_rx_idx = end;
460 port->stop_rx = true;
461 } else {
462 port->stop_rx_idx = 0;
463 port->stop_rx = false;
464 }
465
466 return err;
467 }
468
469 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
470 struct vio_dring_state *dr,
471 u32 index)
472 {
473 struct vio_net_desc *desc = port->vio.desc_buf;
474 int err;
475
476 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
477 (index * dr->entry_size),
478 dr->cookies, dr->ncookies);
479 if (err < 0)
480 return ERR_PTR(err);
481
482 return desc;
483 }
484
485 static int put_rx_desc(struct vnet_port *port,
486 struct vio_dring_state *dr,
487 struct vio_net_desc *desc,
488 u32 index)
489 {
490 int err;
491
492 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
493 (index * dr->entry_size),
494 dr->cookies, dr->ncookies);
495 if (err < 0)
496 return err;
497
498 return 0;
499 }
500
501 static int vnet_walk_rx_one(struct vnet_port *port,
502 struct vio_dring_state *dr,
503 u32 index, int *needs_ack)
504 {
505 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
506 struct vio_driver_state *vio = &port->vio;
507 int err;
508
509 BUG_ON(desc == NULL);
510 if (IS_ERR(desc))
511 return PTR_ERR(desc);
512
513 if (desc->hdr.state != VIO_DESC_READY)
514 return 1;
515
516 rmb();
517
518 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
519 desc->hdr.state, desc->hdr.ack,
520 desc->size, desc->ncookies,
521 desc->cookies[0].cookie_addr,
522 desc->cookies[0].cookie_size);
523
524 err = vnet_rx_one(port, desc);
525 if (err == -ECONNRESET)
526 return err;
527 desc->hdr.state = VIO_DESC_DONE;
528 err = put_rx_desc(port, dr, desc, index);
529 if (err < 0)
530 return err;
531 *needs_ack = desc->hdr.ack;
532 return 0;
533 }
534
535 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
536 u32 start, u32 end, int *npkts, int budget)
537 {
538 struct vio_driver_state *vio = &port->vio;
539 int ack_start = -1, ack_end = -1;
540 bool send_ack = true;
541
542 end = (end == (u32) -1) ? vio_dring_prev(dr, start)
543 : vio_dring_next(dr, end);
544
545 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
546
547 while (start != end) {
548 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
549 if (err == -ECONNRESET)
550 return err;
551 if (err != 0)
552 break;
553 (*npkts)++;
554 if (ack_start == -1)
555 ack_start = start;
556 ack_end = start;
557 start = vio_dring_next(dr, start);
558 if (ack && start != end) {
559 err = vnet_send_ack(port, dr, ack_start, ack_end,
560 VIO_DRING_ACTIVE);
561 if (err == -ECONNRESET)
562 return err;
563 ack_start = -1;
564 }
565 if ((*npkts) >= budget) {
566 send_ack = false;
567 break;
568 }
569 }
570 if (unlikely(ack_start == -1))
571 ack_start = ack_end = vio_dring_prev(dr, start);
572 if (send_ack) {
573 port->napi_resume = false;
574 return vnet_send_ack(port, dr, ack_start, ack_end,
575 VIO_DRING_STOPPED);
576 } else {
577 port->napi_resume = true;
578 port->napi_stop_idx = ack_end;
579 return 1;
580 }
581 }
582
583 static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
584 int budget)
585 {
586 struct vio_dring_data *pkt = msgbuf;
587 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
588 struct vio_driver_state *vio = &port->vio;
589
590 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
591 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
592
593 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
594 return 0;
595 if (unlikely(pkt->seq != dr->rcv_nxt)) {
596 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
597 pkt->seq, dr->rcv_nxt);
598 return 0;
599 }
600
601 if (!port->napi_resume)
602 dr->rcv_nxt++;
603
604 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
605
606 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
607 npkts, budget);
608 }
609
610 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
611 {
612 u32 idx = dr->cons;
613 int found = 0;
614
615 while (idx != dr->prod) {
616 if (idx == end) {
617 found = 1;
618 break;
619 }
620 idx = vio_dring_next(dr, idx);
621 }
622 return found;
623 }
624
625 static int vnet_ack(struct vnet_port *port, void *msgbuf)
626 {
627 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
628 struct vio_dring_data *pkt = msgbuf;
629 struct net_device *dev;
630 struct vnet *vp;
631 u32 end;
632 struct vio_net_desc *desc;
633 struct netdev_queue *txq;
634
635 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
636 return 0;
637
638 end = pkt->end_idx;
639 vp = port->vp;
640 dev = vp->dev;
641 netif_tx_lock(dev);
642 if (unlikely(!idx_is_pending(dr, end))) {
643 netif_tx_unlock(dev);
644 return 0;
645 }
646
647 /* sync for race conditions with vnet_start_xmit() and tell xmit it
648 * is time to send a trigger.
649 */
650 dr->cons = vio_dring_next(dr, end);
651 desc = vio_dring_entry(dr, dr->cons);
652 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
653 /* vnet_start_xmit() just populated this dring but missed
654 * sending the "start" LDC message to the consumer.
655 * Send a "start" trigger on its behalf.
656 */
657 if (__vnet_tx_trigger(port, dr->cons) > 0)
658 port->start_cons = false;
659 else
660 port->start_cons = true;
661 } else {
662 port->start_cons = true;
663 }
664 netif_tx_unlock(dev);
665
666 txq = netdev_get_tx_queue(dev, port->q_index);
667 if (unlikely(netif_tx_queue_stopped(txq) &&
668 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
669 return 1;
670
671 return 0;
672 }
673
674 static int vnet_nack(struct vnet_port *port, void *msgbuf)
675 {
676 /* XXX just reset or similar XXX */
677 return 0;
678 }
679
680 static int handle_mcast(struct vnet_port *port, void *msgbuf)
681 {
682 struct vio_net_mcast_info *pkt = msgbuf;
683
684 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
685 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
686 port->vp->dev->name,
687 pkt->tag.type,
688 pkt->tag.stype,
689 pkt->tag.stype_env,
690 pkt->tag.sid);
691
692 return 0;
693 }
694
695 /* Got back a STOPPED LDC message on port. If the queue is stopped,
696 * wake it up so that we'll send out another START message at the
697 * next TX.
698 */
699 static void maybe_tx_wakeup(struct vnet_port *port)
700 {
701 struct netdev_queue *txq;
702
703 txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
704 __netif_tx_lock(txq, smp_processor_id());
705 if (likely(netif_tx_queue_stopped(txq))) {
706 struct vio_dring_state *dr;
707
708 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
709 netif_tx_wake_queue(txq);
710 }
711 __netif_tx_unlock(txq);
712 }
713
714 static inline bool port_is_up(struct vnet_port *vnet)
715 {
716 struct vio_driver_state *vio = &vnet->vio;
717
718 return !!(vio->hs_state & VIO_HS_COMPLETE);
719 }
720
721 static int vnet_event_napi(struct vnet_port *port, int budget)
722 {
723 struct vio_driver_state *vio = &port->vio;
724 int tx_wakeup, err;
725 int npkts = 0;
726 int event = (port->rx_event & LDC_EVENT_RESET);
727
728 ldc_ctrl:
729 if (unlikely(event == LDC_EVENT_RESET ||
730 event == LDC_EVENT_UP)) {
731 vio_link_state_change(vio, event);
732
733 if (event == LDC_EVENT_RESET) {
734 port->rmtu = 0;
735 port->tso = true;
736 port->tsolen = 0;
737 vio_port_up(vio);
738 }
739 port->rx_event = 0;
740 return 0;
741 }
742 /* We may have multiple LDC events in rx_event. Unroll send_events() */
743 event = (port->rx_event & LDC_EVENT_UP);
744 port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP);
745 if (event == LDC_EVENT_UP)
746 goto ldc_ctrl;
747 event = port->rx_event;
748 if (!(event & LDC_EVENT_DATA_READY))
749 return 0;
750
751 /* we dont expect any other bits than RESET, UP, DATA_READY */
752 BUG_ON(event != LDC_EVENT_DATA_READY);
753
754 tx_wakeup = err = 0;
755 while (1) {
756 union {
757 struct vio_msg_tag tag;
758 u64 raw[8];
759 } msgbuf;
760
761 if (port->napi_resume) {
762 struct vio_dring_data *pkt =
763 (struct vio_dring_data *)&msgbuf;
764 struct vio_dring_state *dr =
765 &port->vio.drings[VIO_DRIVER_RX_RING];
766
767 pkt->tag.type = VIO_TYPE_DATA;
768 pkt->tag.stype = VIO_SUBTYPE_INFO;
769 pkt->tag.stype_env = VIO_DRING_DATA;
770 pkt->seq = dr->rcv_nxt;
771 pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx);
772 pkt->end_idx = -1;
773 goto napi_resume;
774 }
775 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
776 if (unlikely(err < 0)) {
777 if (err == -ECONNRESET)
778 vio_conn_reset(vio);
779 break;
780 }
781 if (err == 0)
782 break;
783 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
784 msgbuf.tag.type,
785 msgbuf.tag.stype,
786 msgbuf.tag.stype_env,
787 msgbuf.tag.sid);
788 err = vio_validate_sid(vio, &msgbuf.tag);
789 if (err < 0)
790 break;
791 napi_resume:
792 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
793 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
794 if (!port_is_up(port)) {
795 /* failures like handshake_failure()
796 * may have cleaned up dring, but
797 * NAPI polling may bring us here.
798 */
799 err = -ECONNRESET;
800 break;
801 }
802 err = vnet_rx(port, &msgbuf, &npkts, budget);
803 if (npkts >= budget)
804 break;
805 if (npkts == 0)
806 break;
807 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
808 err = vnet_ack(port, &msgbuf);
809 if (err > 0)
810 tx_wakeup |= err;
811 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
812 err = vnet_nack(port, &msgbuf);
813 }
814 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
815 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
816 err = handle_mcast(port, &msgbuf);
817 else
818 err = vio_control_pkt_engine(vio, &msgbuf);
819 if (err)
820 break;
821 } else {
822 err = vnet_handle_unknown(port, &msgbuf);
823 }
824 if (err == -ECONNRESET)
825 break;
826 }
827 if (unlikely(tx_wakeup && err != -ECONNRESET))
828 maybe_tx_wakeup(port);
829 return npkts;
830 }
831
832 static int vnet_poll(struct napi_struct *napi, int budget)
833 {
834 struct vnet_port *port = container_of(napi, struct vnet_port, napi);
835 struct vio_driver_state *vio = &port->vio;
836 int processed = vnet_event_napi(port, budget);
837
838 if (processed < budget) {
839 napi_complete(napi);
840 port->rx_event &= ~LDC_EVENT_DATA_READY;
841 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
842 }
843 return processed;
844 }
845
846 static void vnet_event(void *arg, int event)
847 {
848 struct vnet_port *port = arg;
849 struct vio_driver_state *vio = &port->vio;
850
851 port->rx_event |= event;
852 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
853 napi_schedule(&port->napi);
854
855 }
856
857 static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
858 {
859 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
860 struct vio_dring_data hdr = {
861 .tag = {
862 .type = VIO_TYPE_DATA,
863 .stype = VIO_SUBTYPE_INFO,
864 .stype_env = VIO_DRING_DATA,
865 .sid = vio_send_sid(&port->vio),
866 },
867 .dring_ident = dr->ident,
868 .start_idx = start,
869 .end_idx = (u32) -1,
870 };
871 int err, delay;
872 int retries = 0;
873
874 if (port->stop_rx) {
875 err = vnet_send_ack(port,
876 &port->vio.drings[VIO_DRIVER_RX_RING],
877 port->stop_rx_idx, -1,
878 VIO_DRING_STOPPED);
879 if (err <= 0)
880 return err;
881 }
882
883 hdr.seq = dr->snd_nxt;
884 delay = 1;
885 do {
886 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
887 if (err > 0) {
888 dr->snd_nxt++;
889 break;
890 }
891 udelay(delay);
892 if ((delay <<= 1) > 128)
893 delay = 128;
894 if (retries++ > VNET_MAX_RETRIES)
895 break;
896 } while (err == -EAGAIN);
897
898 return err;
899 }
900
901 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
902 {
903 unsigned int hash = vnet_hashfn(skb->data);
904 struct hlist_head *hp = &vp->port_hash[hash];
905 struct vnet_port *port;
906
907 hlist_for_each_entry_rcu(port, hp, hash) {
908 if (!port_is_up(port))
909 continue;
910 if (ether_addr_equal(port->raddr, skb->data))
911 return port;
912 }
913 list_for_each_entry_rcu(port, &vp->port_list, list) {
914 if (!port->switch_port)
915 continue;
916 if (!port_is_up(port))
917 continue;
918 return port;
919 }
920 return NULL;
921 }
922
923 static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
924 unsigned *pending)
925 {
926 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
927 struct sk_buff *skb = NULL;
928 int i, txi;
929
930 *pending = 0;
931
932 txi = dr->prod-1;
933 if (txi < 0)
934 txi = VNET_TX_RING_SIZE-1;
935
936 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
937 struct vio_net_desc *d;
938
939 d = vio_dring_entry(dr, txi);
940
941 if (d->hdr.state == VIO_DESC_DONE) {
942 if (port->tx_bufs[txi].skb) {
943 BUG_ON(port->tx_bufs[txi].skb->next);
944
945 port->tx_bufs[txi].skb->next = skb;
946 skb = port->tx_bufs[txi].skb;
947 port->tx_bufs[txi].skb = NULL;
948
949 ldc_unmap(port->vio.lp,
950 port->tx_bufs[txi].cookies,
951 port->tx_bufs[txi].ncookies);
952 }
953 d->hdr.state = VIO_DESC_FREE;
954 } else if (d->hdr.state == VIO_DESC_READY) {
955 (*pending)++;
956 } else if (d->hdr.state == VIO_DESC_FREE) {
957 break;
958 }
959 --txi;
960 if (txi < 0)
961 txi = VNET_TX_RING_SIZE-1;
962 }
963 return skb;
964 }
965
966 static inline void vnet_free_skbs(struct sk_buff *skb)
967 {
968 struct sk_buff *next;
969
970 while (skb) {
971 next = skb->next;
972 skb->next = NULL;
973 dev_kfree_skb(skb);
974 skb = next;
975 }
976 }
977
978 static void vnet_clean_timer_expire(unsigned long port0)
979 {
980 struct vnet_port *port = (struct vnet_port *)port0;
981 struct sk_buff *freeskbs;
982 unsigned pending;
983
984 netif_tx_lock(port->vp->dev);
985 freeskbs = vnet_clean_tx_ring(port, &pending);
986 netif_tx_unlock(port->vp->dev);
987
988 vnet_free_skbs(freeskbs);
989
990 if (pending)
991 (void)mod_timer(&port->clean_timer,
992 jiffies + VNET_CLEAN_TIMEOUT);
993 else
994 del_timer(&port->clean_timer);
995 }
996
997 static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
998 struct ldc_trans_cookie *cookies, int ncookies,
999 unsigned int map_perm)
1000 {
1001 int i, nc, err, blen;
1002
1003 /* header */
1004 blen = skb_headlen(skb);
1005 if (blen < ETH_ZLEN)
1006 blen = ETH_ZLEN;
1007 blen += VNET_PACKET_SKIP;
1008 blen += 8 - (blen & 7);
1009
1010 err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies,
1011 ncookies, map_perm);
1012 if (err < 0)
1013 return err;
1014 nc = err;
1015
1016 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1017 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1018 u8 *vaddr;
1019
1020 if (nc < ncookies) {
1021 vaddr = kmap_atomic(skb_frag_page(f));
1022 blen = skb_frag_size(f);
1023 blen += 8 - (blen & 7);
1024 err = ldc_map_single(lp, vaddr + f->page_offset,
1025 blen, cookies + nc, ncookies - nc,
1026 map_perm);
1027 kunmap_atomic(vaddr);
1028 } else {
1029 err = -EMSGSIZE;
1030 }
1031
1032 if (err < 0) {
1033 ldc_unmap(lp, cookies, nc);
1034 return err;
1035 }
1036 nc += err;
1037 }
1038 return nc;
1039 }
1040
1041 static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
1042 {
1043 struct sk_buff *nskb;
1044 int i, len, pad, docopy;
1045
1046 len = skb->len;
1047 pad = 0;
1048 if (len < ETH_ZLEN) {
1049 pad += ETH_ZLEN - skb->len;
1050 len += pad;
1051 }
1052 len += VNET_PACKET_SKIP;
1053 pad += 8 - (len & 7);
1054
1055 /* make sure we have enough cookies and alignment in every frag */
1056 docopy = skb_shinfo(skb)->nr_frags >= ncookies;
1057 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1058 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1059
1060 docopy |= f->page_offset & 7;
1061 }
1062 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
1063 skb_tailroom(skb) < pad ||
1064 skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
1065 int start = 0, offset;
1066 __wsum csum;
1067
1068 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
1069 nskb = alloc_and_align_skb(skb->dev, len);
1070 if (nskb == NULL) {
1071 dev_kfree_skb(skb);
1072 return NULL;
1073 }
1074 skb_reserve(nskb, VNET_PACKET_SKIP);
1075
1076 nskb->protocol = skb->protocol;
1077 offset = skb_mac_header(skb) - skb->data;
1078 skb_set_mac_header(nskb, offset);
1079 offset = skb_network_header(skb) - skb->data;
1080 skb_set_network_header(nskb, offset);
1081 offset = skb_transport_header(skb) - skb->data;
1082 skb_set_transport_header(nskb, offset);
1083
1084 offset = 0;
1085 nskb->csum_offset = skb->csum_offset;
1086 nskb->ip_summed = skb->ip_summed;
1087
1088 if (skb->ip_summed == CHECKSUM_PARTIAL)
1089 start = skb_checksum_start_offset(skb);
1090 if (start) {
1091 struct iphdr *iph = ip_hdr(nskb);
1092 int offset = start + nskb->csum_offset;
1093
1094 if (skb_copy_bits(skb, 0, nskb->data, start)) {
1095 dev_kfree_skb(nskb);
1096 dev_kfree_skb(skb);
1097 return NULL;
1098 }
1099 *(__sum16 *)(skb->data + offset) = 0;
1100 csum = skb_copy_and_csum_bits(skb, start,
1101 nskb->data + start,
1102 skb->len - start, 0);
1103 if (iph->protocol == IPPROTO_TCP ||
1104 iph->protocol == IPPROTO_UDP) {
1105 csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
1106 skb->len - start,
1107 iph->protocol, csum);
1108 }
1109 *(__sum16 *)(nskb->data + offset) = csum;
1110
1111 nskb->ip_summed = CHECKSUM_NONE;
1112 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
1113 dev_kfree_skb(nskb);
1114 dev_kfree_skb(skb);
1115 return NULL;
1116 }
1117 (void)skb_put(nskb, skb->len);
1118 if (skb_is_gso(skb)) {
1119 skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
1120 skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
1121 }
1122 dev_kfree_skb(skb);
1123 skb = nskb;
1124 }
1125 return skb;
1126 }
1127
1128 static u16
1129 vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
1130 void *accel_priv, select_queue_fallback_t fallback)
1131 {
1132 struct vnet *vp = netdev_priv(dev);
1133 struct vnet_port *port = __tx_port_find(vp, skb);
1134
1135 if (port == NULL)
1136 return 0;
1137 return port->q_index;
1138 }
1139
1140 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev);
1141
1142 static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
1143 {
1144 struct net_device *dev = port->vp->dev;
1145 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1146 struct sk_buff *segs;
1147 int maclen, datalen;
1148 int status;
1149 int gso_size, gso_type, gso_segs;
1150 int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1151 int proto = IPPROTO_IP;
1152
1153 if (skb->protocol == htons(ETH_P_IP))
1154 proto = ip_hdr(skb)->protocol;
1155 else if (skb->protocol == htons(ETH_P_IPV6))
1156 proto = ipv6_hdr(skb)->nexthdr;
1157
1158 if (proto == IPPROTO_TCP)
1159 hlen += tcp_hdr(skb)->doff * 4;
1160 else if (proto == IPPROTO_UDP)
1161 hlen += sizeof(struct udphdr);
1162 else {
1163 pr_err("vnet_handle_offloads GSO with unknown transport "
1164 "protocol %d tproto %d\n", skb->protocol, proto);
1165 hlen = 128; /* XXX */
1166 }
1167 datalen = port->tsolen - hlen;
1168
1169 gso_size = skb_shinfo(skb)->gso_size;
1170 gso_type = skb_shinfo(skb)->gso_type;
1171 gso_segs = skb_shinfo(skb)->gso_segs;
1172
1173 if (port->tso && gso_size < datalen)
1174 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1175
1176 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1177 struct netdev_queue *txq;
1178
1179 txq = netdev_get_tx_queue(dev, port->q_index);
1180 netif_tx_stop_queue(txq);
1181 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1182 return NETDEV_TX_BUSY;
1183 netif_tx_wake_queue(txq);
1184 }
1185
1186 maclen = skb_network_header(skb) - skb_mac_header(skb);
1187 skb_pull(skb, maclen);
1188
1189 if (port->tso && gso_size < datalen) {
1190 /* segment to TSO size */
1191 skb_shinfo(skb)->gso_size = datalen;
1192 skb_shinfo(skb)->gso_segs = gso_segs;
1193
1194 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1195
1196 /* restore gso_size & gso_segs */
1197 skb_shinfo(skb)->gso_size = gso_size;
1198 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len - hlen,
1199 gso_size);
1200 } else
1201 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1202 if (IS_ERR(segs)) {
1203 dev->stats.tx_dropped++;
1204 return NETDEV_TX_OK;
1205 }
1206
1207 skb_push(skb, maclen);
1208 skb_reset_mac_header(skb);
1209
1210 status = 0;
1211 while (segs) {
1212 struct sk_buff *curr = segs;
1213
1214 segs = segs->next;
1215 curr->next = NULL;
1216 if (port->tso && curr->len > dev->mtu) {
1217 skb_shinfo(curr)->gso_size = gso_size;
1218 skb_shinfo(curr)->gso_type = gso_type;
1219 skb_shinfo(curr)->gso_segs =
1220 DIV_ROUND_UP(curr->len - hlen, gso_size);
1221 } else
1222 skb_shinfo(curr)->gso_size = 0;
1223
1224 skb_push(curr, maclen);
1225 skb_reset_mac_header(curr);
1226 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1227 maclen);
1228 curr->csum_start = skb_transport_header(curr) - curr->head;
1229 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1230 curr->csum_offset = offsetof(struct tcphdr, check);
1231 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1232 curr->csum_offset = offsetof(struct udphdr, check);
1233
1234 if (!(status & NETDEV_TX_MASK))
1235 status = vnet_start_xmit(curr, dev);
1236 if (status & NETDEV_TX_MASK)
1237 dev_kfree_skb_any(curr);
1238 }
1239
1240 if (!(status & NETDEV_TX_MASK))
1241 dev_kfree_skb_any(skb);
1242 return status;
1243 }
1244
1245 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
1246 {
1247 struct vnet *vp = netdev_priv(dev);
1248 struct vnet_port *port = NULL;
1249 struct vio_dring_state *dr;
1250 struct vio_net_desc *d;
1251 unsigned int len;
1252 struct sk_buff *freeskbs = NULL;
1253 int i, err, txi;
1254 unsigned pending = 0;
1255 struct netdev_queue *txq;
1256
1257 rcu_read_lock();
1258 port = __tx_port_find(vp, skb);
1259 if (unlikely(!port)) {
1260 rcu_read_unlock();
1261 goto out_dropped;
1262 }
1263
1264 if (skb_is_gso(skb) && skb->len > port->tsolen) {
1265 err = vnet_handle_offloads(port, skb);
1266 rcu_read_unlock();
1267 return err;
1268 }
1269
1270 if (!skb_is_gso(skb) && skb->len > port->rmtu) {
1271 unsigned long localmtu = port->rmtu - ETH_HLEN;
1272
1273 if (vio_version_after_eq(&port->vio, 1, 3))
1274 localmtu -= VLAN_HLEN;
1275
1276 if (skb->protocol == htons(ETH_P_IP)) {
1277 struct flowi4 fl4;
1278 struct rtable *rt = NULL;
1279
1280 memset(&fl4, 0, sizeof(fl4));
1281 fl4.flowi4_oif = dev->ifindex;
1282 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
1283 fl4.daddr = ip_hdr(skb)->daddr;
1284 fl4.saddr = ip_hdr(skb)->saddr;
1285
1286 rt = ip_route_output_key(dev_net(dev), &fl4);
1287 rcu_read_unlock();
1288 if (!IS_ERR(rt)) {
1289 skb_dst_set(skb, &rt->dst);
1290 icmp_send(skb, ICMP_DEST_UNREACH,
1291 ICMP_FRAG_NEEDED,
1292 htonl(localmtu));
1293 }
1294 }
1295 #if IS_ENABLED(CONFIG_IPV6)
1296 else if (skb->protocol == htons(ETH_P_IPV6))
1297 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1298 #endif
1299 goto out_dropped;
1300 }
1301
1302 skb = vnet_skb_shape(skb, 2);
1303
1304 if (unlikely(!skb))
1305 goto out_dropped;
1306
1307 if (skb->ip_summed == CHECKSUM_PARTIAL)
1308 vnet_fullcsum(skb);
1309
1310 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1311 i = skb_get_queue_mapping(skb);
1312 txq = netdev_get_tx_queue(dev, i);
1313 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1314 if (!netif_tx_queue_stopped(txq)) {
1315 netif_tx_stop_queue(txq);
1316
1317 /* This is a hard error, log it. */
1318 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1319 dev->stats.tx_errors++;
1320 }
1321 rcu_read_unlock();
1322 return NETDEV_TX_BUSY;
1323 }
1324
1325 d = vio_dring_cur(dr);
1326
1327 txi = dr->prod;
1328
1329 freeskbs = vnet_clean_tx_ring(port, &pending);
1330
1331 BUG_ON(port->tx_bufs[txi].skb);
1332
1333 len = skb->len;
1334 if (len < ETH_ZLEN)
1335 len = ETH_ZLEN;
1336
1337 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1338 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1339 if (err < 0) {
1340 netdev_info(dev, "tx buffer map error %d\n", err);
1341 goto out_dropped;
1342 }
1343
1344 port->tx_bufs[txi].skb = skb;
1345 skb = NULL;
1346 port->tx_bufs[txi].ncookies = err;
1347
1348 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1349 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1350 * the protocol itself does not require it as long as the peer
1351 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1352 *
1353 * An ACK for every packet in the ring is expensive as the
1354 * sending of LDC messages is slow and affects performance.
1355 */
1356 d->hdr.ack = VIO_ACK_DISABLE;
1357 d->size = len;
1358 d->ncookies = port->tx_bufs[txi].ncookies;
1359 for (i = 0; i < d->ncookies; i++)
1360 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1361 if (vio_version_after_eq(&port->vio, 1, 7)) {
1362 struct vio_net_dext *dext = vio_net_ext(d);
1363
1364 memset(dext, 0, sizeof(*dext));
1365 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1366 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1367 ->gso_size;
1368 dext->flags |= VNET_PKT_IPV4_LSO;
1369 }
1370 if (vio_version_after_eq(&port->vio, 1, 8) &&
1371 !port->switch_port) {
1372 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1373 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1374 }
1375 }
1376
1377 /* This has to be a non-SMP write barrier because we are writing
1378 * to memory which is shared with the peer LDOM.
1379 */
1380 wmb();
1381
1382 d->hdr.state = VIO_DESC_READY;
1383
1384 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1385 * to notify the consumer that some descriptors are READY.
1386 * After that "start" trigger, no additional triggers are needed until
1387 * a DRING_STOPPED is received from the consumer. The dr->cons field
1388 * (set up by vnet_ack()) has the value of the next dring index
1389 * that has not yet been ack-ed. We send a "start" trigger here
1390 * if, and only if, start_cons is true (reset it afterward). Conversely,
1391 * vnet_ack() should check if the dring corresponding to cons
1392 * is marked READY, but start_cons was false.
1393 * If so, vnet_ack() should send out the missed "start" trigger.
1394 *
1395 * Note that the wmb() above makes sure the cookies et al. are
1396 * not globally visible before the VIO_DESC_READY, and that the
1397 * stores are ordered correctly by the compiler. The consumer will
1398 * not proceed until the VIO_DESC_READY is visible assuring that
1399 * the consumer does not observe anything related to descriptors
1400 * out of order. The HV trap from the LDC start trigger is the
1401 * producer to consumer announcement that work is available to the
1402 * consumer
1403 */
1404 if (!port->start_cons)
1405 goto ldc_start_done; /* previous trigger suffices */
1406
1407 err = __vnet_tx_trigger(port, dr->cons);
1408 if (unlikely(err < 0)) {
1409 netdev_info(dev, "TX trigger error %d\n", err);
1410 d->hdr.state = VIO_DESC_FREE;
1411 dev->stats.tx_carrier_errors++;
1412 goto out_dropped;
1413 }
1414
1415 ldc_start_done:
1416 port->start_cons = false;
1417
1418 dev->stats.tx_packets++;
1419 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1420
1421 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1422 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1423 netif_tx_stop_queue(txq);
1424 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1425 netif_tx_wake_queue(txq);
1426 }
1427
1428 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1429 rcu_read_unlock();
1430
1431 vnet_free_skbs(freeskbs);
1432
1433 return NETDEV_TX_OK;
1434
1435 out_dropped:
1436 if (pending)
1437 (void)mod_timer(&port->clean_timer,
1438 jiffies + VNET_CLEAN_TIMEOUT);
1439 else if (port)
1440 del_timer(&port->clean_timer);
1441 if (port)
1442 rcu_read_unlock();
1443 if (skb)
1444 dev_kfree_skb(skb);
1445 vnet_free_skbs(freeskbs);
1446 dev->stats.tx_dropped++;
1447 return NETDEV_TX_OK;
1448 }
1449
1450 static void vnet_tx_timeout(struct net_device *dev)
1451 {
1452 /* XXX Implement me XXX */
1453 }
1454
1455 static int vnet_open(struct net_device *dev)
1456 {
1457 netif_carrier_on(dev);
1458 netif_tx_start_all_queues(dev);
1459
1460 return 0;
1461 }
1462
1463 static int vnet_close(struct net_device *dev)
1464 {
1465 netif_tx_stop_all_queues(dev);
1466 netif_carrier_off(dev);
1467
1468 return 0;
1469 }
1470
1471 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1472 {
1473 struct vnet_mcast_entry *m;
1474
1475 for (m = vp->mcast_list; m; m = m->next) {
1476 if (ether_addr_equal(m->addr, addr))
1477 return m;
1478 }
1479 return NULL;
1480 }
1481
1482 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1483 {
1484 struct netdev_hw_addr *ha;
1485
1486 netdev_for_each_mc_addr(ha, dev) {
1487 struct vnet_mcast_entry *m;
1488
1489 m = __vnet_mc_find(vp, ha->addr);
1490 if (m) {
1491 m->hit = 1;
1492 continue;
1493 }
1494
1495 if (!m) {
1496 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1497 if (!m)
1498 continue;
1499 memcpy(m->addr, ha->addr, ETH_ALEN);
1500 m->hit = 1;
1501
1502 m->next = vp->mcast_list;
1503 vp->mcast_list = m;
1504 }
1505 }
1506 }
1507
1508 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1509 {
1510 struct vio_net_mcast_info info;
1511 struct vnet_mcast_entry *m, **pp;
1512 int n_addrs;
1513
1514 memset(&info, 0, sizeof(info));
1515
1516 info.tag.type = VIO_TYPE_CTRL;
1517 info.tag.stype = VIO_SUBTYPE_INFO;
1518 info.tag.stype_env = VNET_MCAST_INFO;
1519 info.tag.sid = vio_send_sid(&port->vio);
1520 info.set = 1;
1521
1522 n_addrs = 0;
1523 for (m = vp->mcast_list; m; m = m->next) {
1524 if (m->sent)
1525 continue;
1526 m->sent = 1;
1527 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1528 m->addr, ETH_ALEN);
1529 if (++n_addrs == VNET_NUM_MCAST) {
1530 info.count = n_addrs;
1531
1532 (void) vio_ldc_send(&port->vio, &info,
1533 sizeof(info));
1534 n_addrs = 0;
1535 }
1536 }
1537 if (n_addrs) {
1538 info.count = n_addrs;
1539 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1540 }
1541
1542 info.set = 0;
1543
1544 n_addrs = 0;
1545 pp = &vp->mcast_list;
1546 while ((m = *pp) != NULL) {
1547 if (m->hit) {
1548 m->hit = 0;
1549 pp = &m->next;
1550 continue;
1551 }
1552
1553 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1554 m->addr, ETH_ALEN);
1555 if (++n_addrs == VNET_NUM_MCAST) {
1556 info.count = n_addrs;
1557 (void) vio_ldc_send(&port->vio, &info,
1558 sizeof(info));
1559 n_addrs = 0;
1560 }
1561
1562 *pp = m->next;
1563 kfree(m);
1564 }
1565 if (n_addrs) {
1566 info.count = n_addrs;
1567 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1568 }
1569 }
1570
1571 static void vnet_set_rx_mode(struct net_device *dev)
1572 {
1573 struct vnet *vp = netdev_priv(dev);
1574 struct vnet_port *port;
1575
1576 rcu_read_lock();
1577 list_for_each_entry_rcu(port, &vp->port_list, list) {
1578
1579 if (port->switch_port) {
1580 __update_mc_list(vp, dev);
1581 __send_mc_list(vp, port);
1582 break;
1583 }
1584 }
1585 rcu_read_unlock();
1586 }
1587
1588 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
1589 {
1590 if (new_mtu < 68 || new_mtu > 65535)
1591 return -EINVAL;
1592
1593 dev->mtu = new_mtu;
1594 return 0;
1595 }
1596
1597 static int vnet_set_mac_addr(struct net_device *dev, void *p)
1598 {
1599 return -EINVAL;
1600 }
1601
1602 static void vnet_get_drvinfo(struct net_device *dev,
1603 struct ethtool_drvinfo *info)
1604 {
1605 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
1606 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
1607 }
1608
1609 static u32 vnet_get_msglevel(struct net_device *dev)
1610 {
1611 struct vnet *vp = netdev_priv(dev);
1612 return vp->msg_enable;
1613 }
1614
1615 static void vnet_set_msglevel(struct net_device *dev, u32 value)
1616 {
1617 struct vnet *vp = netdev_priv(dev);
1618 vp->msg_enable = value;
1619 }
1620
1621 static const struct ethtool_ops vnet_ethtool_ops = {
1622 .get_drvinfo = vnet_get_drvinfo,
1623 .get_msglevel = vnet_get_msglevel,
1624 .set_msglevel = vnet_set_msglevel,
1625 .get_link = ethtool_op_get_link,
1626 };
1627
1628 static void vnet_port_free_tx_bufs(struct vnet_port *port)
1629 {
1630 struct vio_dring_state *dr;
1631 int i;
1632
1633 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1634 if (dr->base) {
1635 ldc_free_exp_dring(port->vio.lp, dr->base,
1636 (dr->entry_size * dr->num_entries),
1637 dr->cookies, dr->ncookies);
1638 dr->base = NULL;
1639 dr->entry_size = 0;
1640 dr->num_entries = 0;
1641 dr->pending = 0;
1642 dr->ncookies = 0;
1643 }
1644
1645 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1646 struct vio_net_desc *d;
1647 void *skb = port->tx_bufs[i].skb;
1648
1649 if (!skb)
1650 continue;
1651
1652 d = vio_dring_entry(dr, i);
1653 if (d->hdr.state == VIO_DESC_READY)
1654 pr_warn("active transmit buffers freed\n");
1655
1656 ldc_unmap(port->vio.lp,
1657 port->tx_bufs[i].cookies,
1658 port->tx_bufs[i].ncookies);
1659 dev_kfree_skb(skb);
1660 port->tx_bufs[i].skb = NULL;
1661 d->hdr.state = VIO_DESC_FREE;
1662 }
1663 }
1664
1665 static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1666 {
1667 struct vio_dring_state *dr;
1668 unsigned long len, elen;
1669 int i, err, ncookies;
1670 void *dring;
1671
1672 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1673
1674 elen = sizeof(struct vio_net_desc) +
1675 sizeof(struct ldc_trans_cookie) * 2;
1676 if (vio_version_after_eq(&port->vio, 1, 7))
1677 elen += sizeof(struct vio_net_dext);
1678 len = VNET_TX_RING_SIZE * elen;
1679
1680 ncookies = VIO_MAX_RING_COOKIES;
1681 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1682 dr->cookies, &ncookies,
1683 (LDC_MAP_SHADOW |
1684 LDC_MAP_DIRECT |
1685 LDC_MAP_RW));
1686 if (IS_ERR(dring)) {
1687 err = PTR_ERR(dring);
1688 goto err_out;
1689 }
1690
1691 dr->base = dring;
1692 dr->entry_size = elen;
1693 dr->num_entries = VNET_TX_RING_SIZE;
1694 dr->prod = dr->cons = 0;
1695 port->start_cons = true; /* need an initial trigger */
1696 dr->pending = VNET_TX_RING_SIZE;
1697 dr->ncookies = ncookies;
1698
1699 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1700 struct vio_net_desc *d;
1701
1702 d = vio_dring_entry(dr, i);
1703 d->hdr.state = VIO_DESC_FREE;
1704 }
1705 return 0;
1706
1707 err_out:
1708 vnet_port_free_tx_bufs(port);
1709
1710 return err;
1711 }
1712
1713 #ifdef CONFIG_NET_POLL_CONTROLLER
1714 static void vnet_poll_controller(struct net_device *dev)
1715 {
1716 struct vnet *vp = netdev_priv(dev);
1717 struct vnet_port *port;
1718 unsigned long flags;
1719
1720 spin_lock_irqsave(&vp->lock, flags);
1721 if (!list_empty(&vp->port_list)) {
1722 port = list_entry(vp->port_list.next, struct vnet_port, list);
1723 napi_schedule(&port->napi);
1724 }
1725 spin_unlock_irqrestore(&vp->lock, flags);
1726 }
1727 #endif
1728 static LIST_HEAD(vnet_list);
1729 static DEFINE_MUTEX(vnet_list_mutex);
1730
1731 static const struct net_device_ops vnet_ops = {
1732 .ndo_open = vnet_open,
1733 .ndo_stop = vnet_close,
1734 .ndo_set_rx_mode = vnet_set_rx_mode,
1735 .ndo_set_mac_address = vnet_set_mac_addr,
1736 .ndo_validate_addr = eth_validate_addr,
1737 .ndo_tx_timeout = vnet_tx_timeout,
1738 .ndo_change_mtu = vnet_change_mtu,
1739 .ndo_start_xmit = vnet_start_xmit,
1740 .ndo_select_queue = vnet_select_queue,
1741 #ifdef CONFIG_NET_POLL_CONTROLLER
1742 .ndo_poll_controller = vnet_poll_controller,
1743 #endif
1744 };
1745
1746 static struct vnet *vnet_new(const u64 *local_mac)
1747 {
1748 struct net_device *dev;
1749 struct vnet *vp;
1750 int err, i;
1751
1752 dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
1753 if (!dev)
1754 return ERR_PTR(-ENOMEM);
1755 dev->needed_headroom = VNET_PACKET_SKIP + 8;
1756 dev->needed_tailroom = 8;
1757
1758 for (i = 0; i < ETH_ALEN; i++)
1759 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1760
1761 vp = netdev_priv(dev);
1762
1763 spin_lock_init(&vp->lock);
1764 vp->dev = dev;
1765
1766 INIT_LIST_HEAD(&vp->port_list);
1767 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1768 INIT_HLIST_HEAD(&vp->port_hash[i]);
1769 INIT_LIST_HEAD(&vp->list);
1770 vp->local_mac = *local_mac;
1771
1772 dev->netdev_ops = &vnet_ops;
1773 dev->ethtool_ops = &vnet_ethtool_ops;
1774 dev->watchdog_timeo = VNET_TX_TIMEOUT;
1775
1776 dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
1777 NETIF_F_HW_CSUM | NETIF_F_SG;
1778 dev->features = dev->hw_features;
1779
1780 err = register_netdev(dev);
1781 if (err) {
1782 pr_err("Cannot register net device, aborting\n");
1783 goto err_out_free_dev;
1784 }
1785
1786 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
1787
1788 list_add(&vp->list, &vnet_list);
1789
1790 return vp;
1791
1792 err_out_free_dev:
1793 free_netdev(dev);
1794
1795 return ERR_PTR(err);
1796 }
1797
1798 static struct vnet *vnet_find_or_create(const u64 *local_mac)
1799 {
1800 struct vnet *iter, *vp;
1801
1802 mutex_lock(&vnet_list_mutex);
1803 vp = NULL;
1804 list_for_each_entry(iter, &vnet_list, list) {
1805 if (iter->local_mac == *local_mac) {
1806 vp = iter;
1807 break;
1808 }
1809 }
1810 if (!vp)
1811 vp = vnet_new(local_mac);
1812 mutex_unlock(&vnet_list_mutex);
1813
1814 return vp;
1815 }
1816
1817 static void vnet_cleanup(void)
1818 {
1819 struct vnet *vp;
1820 struct net_device *dev;
1821
1822 mutex_lock(&vnet_list_mutex);
1823 while (!list_empty(&vnet_list)) {
1824 vp = list_first_entry(&vnet_list, struct vnet, list);
1825 list_del(&vp->list);
1826 dev = vp->dev;
1827 /* vio_unregister_driver() should have cleaned up port_list */
1828 BUG_ON(!list_empty(&vp->port_list));
1829 unregister_netdev(dev);
1830 free_netdev(dev);
1831 }
1832 mutex_unlock(&vnet_list_mutex);
1833 }
1834
1835 static const char *local_mac_prop = "local-mac-address";
1836
1837 static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
1838 u64 port_node)
1839 {
1840 const u64 *local_mac = NULL;
1841 u64 a;
1842
1843 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1844 u64 target = mdesc_arc_target(hp, a);
1845 const char *name;
1846
1847 name = mdesc_get_property(hp, target, "name", NULL);
1848 if (!name || strcmp(name, "network"))
1849 continue;
1850
1851 local_mac = mdesc_get_property(hp, target,
1852 local_mac_prop, NULL);
1853 if (local_mac)
1854 break;
1855 }
1856 if (!local_mac)
1857 return ERR_PTR(-ENODEV);
1858
1859 return vnet_find_or_create(local_mac);
1860 }
1861
1862 static struct ldc_channel_config vnet_ldc_cfg = {
1863 .event = vnet_event,
1864 .mtu = 64,
1865 .mode = LDC_MODE_UNRELIABLE,
1866 };
1867
1868 static struct vio_driver_ops vnet_vio_ops = {
1869 .send_attr = vnet_send_attr,
1870 .handle_attr = vnet_handle_attr,
1871 .handshake_complete = vnet_handshake_complete,
1872 };
1873
1874 static void print_version(void)
1875 {
1876 printk_once(KERN_INFO "%s", version);
1877 }
1878
1879 const char *remote_macaddr_prop = "remote-mac-address";
1880
1881 static void
1882 vnet_port_add_txq(struct vnet_port *port)
1883 {
1884 struct vnet *vp = port->vp;
1885 int n;
1886
1887 n = vp->nports++;
1888 n = n & (VNET_MAX_TXQS - 1);
1889 port->q_index = n;
1890 netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index));
1891 }
1892
1893 static void
1894 vnet_port_rm_txq(struct vnet_port *port)
1895 {
1896 port->vp->nports--;
1897 netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
1898 }
1899
1900 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1901 {
1902 struct mdesc_handle *hp;
1903 struct vnet_port *port;
1904 unsigned long flags;
1905 struct vnet *vp;
1906 const u64 *rmac;
1907 int len, i, err, switch_port;
1908
1909 print_version();
1910
1911 hp = mdesc_grab();
1912
1913 vp = vnet_find_parent(hp, vdev->mp);
1914 if (IS_ERR(vp)) {
1915 pr_err("Cannot find port parent vnet\n");
1916 err = PTR_ERR(vp);
1917 goto err_out_put_mdesc;
1918 }
1919
1920 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1921 err = -ENODEV;
1922 if (!rmac) {
1923 pr_err("Port lacks %s property\n", remote_macaddr_prop);
1924 goto err_out_put_mdesc;
1925 }
1926
1927 port = kzalloc(sizeof(*port), GFP_KERNEL);
1928 err = -ENOMEM;
1929 if (!port)
1930 goto err_out_put_mdesc;
1931
1932 for (i = 0; i < ETH_ALEN; i++)
1933 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1934
1935 port->vp = vp;
1936
1937 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1938 vnet_versions, ARRAY_SIZE(vnet_versions),
1939 &vnet_vio_ops, vp->dev->name);
1940 if (err)
1941 goto err_out_free_port;
1942
1943 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1944 if (err)
1945 goto err_out_free_port;
1946
1947 netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT);
1948
1949 INIT_HLIST_NODE(&port->hash);
1950 INIT_LIST_HEAD(&port->list);
1951
1952 switch_port = 0;
1953 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1954 switch_port = 1;
1955 port->switch_port = switch_port;
1956 port->tso = true;
1957 port->tsolen = 0;
1958
1959 spin_lock_irqsave(&vp->lock, flags);
1960 if (switch_port)
1961 list_add_rcu(&port->list, &vp->port_list);
1962 else
1963 list_add_tail_rcu(&port->list, &vp->port_list);
1964 hlist_add_head_rcu(&port->hash,
1965 &vp->port_hash[vnet_hashfn(port->raddr)]);
1966 vnet_port_add_txq(port);
1967 spin_unlock_irqrestore(&vp->lock, flags);
1968
1969 dev_set_drvdata(&vdev->dev, port);
1970
1971 pr_info("%s: PORT ( remote-mac %pM%s )\n",
1972 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
1973
1974 setup_timer(&port->clean_timer, vnet_clean_timer_expire,
1975 (unsigned long)port);
1976
1977 napi_enable(&port->napi);
1978 vio_port_up(&port->vio);
1979
1980 mdesc_release(hp);
1981
1982 return 0;
1983
1984 err_out_free_port:
1985 kfree(port);
1986
1987 err_out_put_mdesc:
1988 mdesc_release(hp);
1989 return err;
1990 }
1991
1992 static int vnet_port_remove(struct vio_dev *vdev)
1993 {
1994 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1995
1996 if (port) {
1997
1998 del_timer_sync(&port->vio.timer);
1999
2000 napi_disable(&port->napi);
2001
2002 list_del_rcu(&port->list);
2003 hlist_del_rcu(&port->hash);
2004
2005 synchronize_rcu();
2006 del_timer_sync(&port->clean_timer);
2007 vnet_port_rm_txq(port);
2008 netif_napi_del(&port->napi);
2009 vnet_port_free_tx_bufs(port);
2010 vio_ldc_free(&port->vio);
2011
2012 dev_set_drvdata(&vdev->dev, NULL);
2013
2014 kfree(port);
2015
2016 }
2017 return 0;
2018 }
2019
2020 static const struct vio_device_id vnet_port_match[] = {
2021 {
2022 .type = "vnet-port",
2023 },
2024 {},
2025 };
2026 MODULE_DEVICE_TABLE(vio, vnet_port_match);
2027
2028 static struct vio_driver vnet_port_driver = {
2029 .id_table = vnet_port_match,
2030 .probe = vnet_port_probe,
2031 .remove = vnet_port_remove,
2032 .name = "vnet_port",
2033 };
2034
2035 static int __init vnet_init(void)
2036 {
2037 return vio_register_driver(&vnet_port_driver);
2038 }
2039
2040 static void __exit vnet_exit(void)
2041 {
2042 vio_unregister_driver(&vnet_port_driver);
2043 vnet_cleanup();
2044 }
2045
2046 module_init(vnet_init);
2047 module_exit(vnet_exit);
Linux kernel - Deliverables
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