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Merge tag 'powerpc-3.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux
[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 u32 next_idx(u32 idx, struct vio_dring_state *dr)
470 {
471 if (++idx == dr->num_entries)
472 idx = 0;
473 return idx;
474 }
475
476 static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
477 {
478 if (idx == 0)
479 idx = dr->num_entries - 1;
480 else
481 idx--;
482
483 return idx;
484 }
485
486 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
487 struct vio_dring_state *dr,
488 u32 index)
489 {
490 struct vio_net_desc *desc = port->vio.desc_buf;
491 int err;
492
493 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
494 (index * dr->entry_size),
495 dr->cookies, dr->ncookies);
496 if (err < 0)
497 return ERR_PTR(err);
498
499 return desc;
500 }
501
502 static int put_rx_desc(struct vnet_port *port,
503 struct vio_dring_state *dr,
504 struct vio_net_desc *desc,
505 u32 index)
506 {
507 int err;
508
509 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
510 (index * dr->entry_size),
511 dr->cookies, dr->ncookies);
512 if (err < 0)
513 return err;
514
515 return 0;
516 }
517
518 static int vnet_walk_rx_one(struct vnet_port *port,
519 struct vio_dring_state *dr,
520 u32 index, int *needs_ack)
521 {
522 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
523 struct vio_driver_state *vio = &port->vio;
524 int err;
525
526 BUG_ON(desc == NULL);
527 if (IS_ERR(desc))
528 return PTR_ERR(desc);
529
530 if (desc->hdr.state != VIO_DESC_READY)
531 return 1;
532
533 rmb();
534
535 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
536 desc->hdr.state, desc->hdr.ack,
537 desc->size, desc->ncookies,
538 desc->cookies[0].cookie_addr,
539 desc->cookies[0].cookie_size);
540
541 err = vnet_rx_one(port, desc);
542 if (err == -ECONNRESET)
543 return err;
544 desc->hdr.state = VIO_DESC_DONE;
545 err = put_rx_desc(port, dr, desc, index);
546 if (err < 0)
547 return err;
548 *needs_ack = desc->hdr.ack;
549 return 0;
550 }
551
552 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
553 u32 start, u32 end, int *npkts, int budget)
554 {
555 struct vio_driver_state *vio = &port->vio;
556 int ack_start = -1, ack_end = -1;
557 bool send_ack = true;
558
559 end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
560
561 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
562
563 while (start != end) {
564 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
565 if (err == -ECONNRESET)
566 return err;
567 if (err != 0)
568 break;
569 (*npkts)++;
570 if (ack_start == -1)
571 ack_start = start;
572 ack_end = start;
573 start = next_idx(start, dr);
574 if (ack && start != end) {
575 err = vnet_send_ack(port, dr, ack_start, ack_end,
576 VIO_DRING_ACTIVE);
577 if (err == -ECONNRESET)
578 return err;
579 ack_start = -1;
580 }
581 if ((*npkts) >= budget) {
582 send_ack = false;
583 break;
584 }
585 }
586 if (unlikely(ack_start == -1))
587 ack_start = ack_end = prev_idx(start, dr);
588 if (send_ack) {
589 port->napi_resume = false;
590 return vnet_send_ack(port, dr, ack_start, ack_end,
591 VIO_DRING_STOPPED);
592 } else {
593 port->napi_resume = true;
594 port->napi_stop_idx = ack_end;
595 return 1;
596 }
597 }
598
599 static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
600 int budget)
601 {
602 struct vio_dring_data *pkt = msgbuf;
603 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
604 struct vio_driver_state *vio = &port->vio;
605
606 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
607 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
608
609 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
610 return 0;
611 if (unlikely(pkt->seq != dr->rcv_nxt)) {
612 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
613 pkt->seq, dr->rcv_nxt);
614 return 0;
615 }
616
617 if (!port->napi_resume)
618 dr->rcv_nxt++;
619
620 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
621
622 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
623 npkts, budget);
624 }
625
626 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
627 {
628 u32 idx = dr->cons;
629 int found = 0;
630
631 while (idx != dr->prod) {
632 if (idx == end) {
633 found = 1;
634 break;
635 }
636 idx = next_idx(idx, dr);
637 }
638 return found;
639 }
640
641 static int vnet_ack(struct vnet_port *port, void *msgbuf)
642 {
643 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
644 struct vio_dring_data *pkt = msgbuf;
645 struct net_device *dev;
646 struct vnet *vp;
647 u32 end;
648 struct vio_net_desc *desc;
649 struct netdev_queue *txq;
650
651 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
652 return 0;
653
654 end = pkt->end_idx;
655 vp = port->vp;
656 dev = vp->dev;
657 netif_tx_lock(dev);
658 if (unlikely(!idx_is_pending(dr, end))) {
659 netif_tx_unlock(dev);
660 return 0;
661 }
662
663 /* sync for race conditions with vnet_start_xmit() and tell xmit it
664 * is time to send a trigger.
665 */
666 dr->cons = next_idx(end, dr);
667 desc = vio_dring_entry(dr, dr->cons);
668 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
669 /* vnet_start_xmit() just populated this dring but missed
670 * sending the "start" LDC message to the consumer.
671 * Send a "start" trigger on its behalf.
672 */
673 if (__vnet_tx_trigger(port, dr->cons) > 0)
674 port->start_cons = false;
675 else
676 port->start_cons = true;
677 } else {
678 port->start_cons = true;
679 }
680 netif_tx_unlock(dev);
681
682 txq = netdev_get_tx_queue(dev, port->q_index);
683 if (unlikely(netif_tx_queue_stopped(txq) &&
684 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
685 return 1;
686
687 return 0;
688 }
689
690 static int vnet_nack(struct vnet_port *port, void *msgbuf)
691 {
692 /* XXX just reset or similar XXX */
693 return 0;
694 }
695
696 static int handle_mcast(struct vnet_port *port, void *msgbuf)
697 {
698 struct vio_net_mcast_info *pkt = msgbuf;
699
700 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
701 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
702 port->vp->dev->name,
703 pkt->tag.type,
704 pkt->tag.stype,
705 pkt->tag.stype_env,
706 pkt->tag.sid);
707
708 return 0;
709 }
710
711 /* Got back a STOPPED LDC message on port. If the queue is stopped,
712 * wake it up so that we'll send out another START message at the
713 * next TX.
714 */
715 static void maybe_tx_wakeup(struct vnet_port *port)
716 {
717 struct netdev_queue *txq;
718
719 txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
720 __netif_tx_lock(txq, smp_processor_id());
721 if (likely(netif_tx_queue_stopped(txq))) {
722 struct vio_dring_state *dr;
723
724 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
725 netif_tx_wake_queue(txq);
726 }
727 __netif_tx_unlock(txq);
728 }
729
730 static inline bool port_is_up(struct vnet_port *vnet)
731 {
732 struct vio_driver_state *vio = &vnet->vio;
733
734 return !!(vio->hs_state & VIO_HS_COMPLETE);
735 }
736
737 static int vnet_event_napi(struct vnet_port *port, int budget)
738 {
739 struct vio_driver_state *vio = &port->vio;
740 int tx_wakeup, err;
741 int npkts = 0;
742 int event = (port->rx_event & LDC_EVENT_RESET);
743
744 ldc_ctrl:
745 if (unlikely(event == LDC_EVENT_RESET ||
746 event == LDC_EVENT_UP)) {
747 vio_link_state_change(vio, event);
748
749 if (event == LDC_EVENT_RESET) {
750 port->rmtu = 0;
751 port->tso = true;
752 port->tsolen = 0;
753 vio_port_up(vio);
754 }
755 port->rx_event = 0;
756 return 0;
757 }
758 /* We may have multiple LDC events in rx_event. Unroll send_events() */
759 event = (port->rx_event & LDC_EVENT_UP);
760 port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP);
761 if (event == LDC_EVENT_UP)
762 goto ldc_ctrl;
763 event = port->rx_event;
764 if (!(event & LDC_EVENT_DATA_READY))
765 return 0;
766
767 /* we dont expect any other bits than RESET, UP, DATA_READY */
768 BUG_ON(event != LDC_EVENT_DATA_READY);
769
770 tx_wakeup = err = 0;
771 while (1) {
772 union {
773 struct vio_msg_tag tag;
774 u64 raw[8];
775 } msgbuf;
776
777 if (port->napi_resume) {
778 struct vio_dring_data *pkt =
779 (struct vio_dring_data *)&msgbuf;
780 struct vio_dring_state *dr =
781 &port->vio.drings[VIO_DRIVER_RX_RING];
782
783 pkt->tag.type = VIO_TYPE_DATA;
784 pkt->tag.stype = VIO_SUBTYPE_INFO;
785 pkt->tag.stype_env = VIO_DRING_DATA;
786 pkt->seq = dr->rcv_nxt;
787 pkt->start_idx = next_idx(port->napi_stop_idx, dr);
788 pkt->end_idx = -1;
789 goto napi_resume;
790 }
791 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
792 if (unlikely(err < 0)) {
793 if (err == -ECONNRESET)
794 vio_conn_reset(vio);
795 break;
796 }
797 if (err == 0)
798 break;
799 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
800 msgbuf.tag.type,
801 msgbuf.tag.stype,
802 msgbuf.tag.stype_env,
803 msgbuf.tag.sid);
804 err = vio_validate_sid(vio, &msgbuf.tag);
805 if (err < 0)
806 break;
807 napi_resume:
808 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
809 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
810 if (!port_is_up(port)) {
811 /* failures like handshake_failure()
812 * may have cleaned up dring, but
813 * NAPI polling may bring us here.
814 */
815 err = -ECONNRESET;
816 break;
817 }
818 err = vnet_rx(port, &msgbuf, &npkts, budget);
819 if (npkts >= budget)
820 break;
821 if (npkts == 0)
822 break;
823 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
824 err = vnet_ack(port, &msgbuf);
825 if (err > 0)
826 tx_wakeup |= err;
827 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
828 err = vnet_nack(port, &msgbuf);
829 }
830 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
831 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
832 err = handle_mcast(port, &msgbuf);
833 else
834 err = vio_control_pkt_engine(vio, &msgbuf);
835 if (err)
836 break;
837 } else {
838 err = vnet_handle_unknown(port, &msgbuf);
839 }
840 if (err == -ECONNRESET)
841 break;
842 }
843 if (unlikely(tx_wakeup && err != -ECONNRESET))
844 maybe_tx_wakeup(port);
845 return npkts;
846 }
847
848 static int vnet_poll(struct napi_struct *napi, int budget)
849 {
850 struct vnet_port *port = container_of(napi, struct vnet_port, napi);
851 struct vio_driver_state *vio = &port->vio;
852 int processed = vnet_event_napi(port, budget);
853
854 if (processed < budget) {
855 napi_complete(napi);
856 port->rx_event &= ~LDC_EVENT_DATA_READY;
857 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
858 }
859 return processed;
860 }
861
862 static void vnet_event(void *arg, int event)
863 {
864 struct vnet_port *port = arg;
865 struct vio_driver_state *vio = &port->vio;
866
867 port->rx_event |= event;
868 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
869 napi_schedule(&port->napi);
870
871 }
872
873 static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
874 {
875 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
876 struct vio_dring_data hdr = {
877 .tag = {
878 .type = VIO_TYPE_DATA,
879 .stype = VIO_SUBTYPE_INFO,
880 .stype_env = VIO_DRING_DATA,
881 .sid = vio_send_sid(&port->vio),
882 },
883 .dring_ident = dr->ident,
884 .start_idx = start,
885 .end_idx = (u32) -1,
886 };
887 int err, delay;
888 int retries = 0;
889
890 if (port->stop_rx) {
891 err = vnet_send_ack(port,
892 &port->vio.drings[VIO_DRIVER_RX_RING],
893 port->stop_rx_idx, -1,
894 VIO_DRING_STOPPED);
895 if (err <= 0)
896 return err;
897 }
898
899 hdr.seq = dr->snd_nxt;
900 delay = 1;
901 do {
902 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
903 if (err > 0) {
904 dr->snd_nxt++;
905 break;
906 }
907 udelay(delay);
908 if ((delay <<= 1) > 128)
909 delay = 128;
910 if (retries++ > VNET_MAX_RETRIES)
911 break;
912 } while (err == -EAGAIN);
913
914 return err;
915 }
916
917 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
918 {
919 unsigned int hash = vnet_hashfn(skb->data);
920 struct hlist_head *hp = &vp->port_hash[hash];
921 struct vnet_port *port;
922
923 hlist_for_each_entry_rcu(port, hp, hash) {
924 if (!port_is_up(port))
925 continue;
926 if (ether_addr_equal(port->raddr, skb->data))
927 return port;
928 }
929 list_for_each_entry_rcu(port, &vp->port_list, list) {
930 if (!port->switch_port)
931 continue;
932 if (!port_is_up(port))
933 continue;
934 return port;
935 }
936 return NULL;
937 }
938
939 static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
940 unsigned *pending)
941 {
942 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
943 struct sk_buff *skb = NULL;
944 int i, txi;
945
946 *pending = 0;
947
948 txi = dr->prod-1;
949 if (txi < 0)
950 txi = VNET_TX_RING_SIZE-1;
951
952 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
953 struct vio_net_desc *d;
954
955 d = vio_dring_entry(dr, txi);
956
957 if (d->hdr.state == VIO_DESC_DONE) {
958 if (port->tx_bufs[txi].skb) {
959 BUG_ON(port->tx_bufs[txi].skb->next);
960
961 port->tx_bufs[txi].skb->next = skb;
962 skb = port->tx_bufs[txi].skb;
963 port->tx_bufs[txi].skb = NULL;
964
965 ldc_unmap(port->vio.lp,
966 port->tx_bufs[txi].cookies,
967 port->tx_bufs[txi].ncookies);
968 }
969 d->hdr.state = VIO_DESC_FREE;
970 } else if (d->hdr.state == VIO_DESC_READY) {
971 (*pending)++;
972 } else if (d->hdr.state == VIO_DESC_FREE) {
973 break;
974 }
975 --txi;
976 if (txi < 0)
977 txi = VNET_TX_RING_SIZE-1;
978 }
979 return skb;
980 }
981
982 static inline void vnet_free_skbs(struct sk_buff *skb)
983 {
984 struct sk_buff *next;
985
986 while (skb) {
987 next = skb->next;
988 skb->next = NULL;
989 dev_kfree_skb(skb);
990 skb = next;
991 }
992 }
993
994 static void vnet_clean_timer_expire(unsigned long port0)
995 {
996 struct vnet_port *port = (struct vnet_port *)port0;
997 struct sk_buff *freeskbs;
998 unsigned pending;
999
1000 netif_tx_lock(port->vp->dev);
1001 freeskbs = vnet_clean_tx_ring(port, &pending);
1002 netif_tx_unlock(port->vp->dev);
1003
1004 vnet_free_skbs(freeskbs);
1005
1006 if (pending)
1007 (void)mod_timer(&port->clean_timer,
1008 jiffies + VNET_CLEAN_TIMEOUT);
1009 else
1010 del_timer(&port->clean_timer);
1011 }
1012
1013 static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
1014 struct ldc_trans_cookie *cookies, int ncookies,
1015 unsigned int map_perm)
1016 {
1017 int i, nc, err, blen;
1018
1019 /* header */
1020 blen = skb_headlen(skb);
1021 if (blen < ETH_ZLEN)
1022 blen = ETH_ZLEN;
1023 blen += VNET_PACKET_SKIP;
1024 blen += 8 - (blen & 7);
1025
1026 err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies,
1027 ncookies, map_perm);
1028 if (err < 0)
1029 return err;
1030 nc = err;
1031
1032 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1033 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1034 u8 *vaddr;
1035
1036 if (nc < ncookies) {
1037 vaddr = kmap_atomic(skb_frag_page(f));
1038 blen = skb_frag_size(f);
1039 blen += 8 - (blen & 7);
1040 err = ldc_map_single(lp, vaddr + f->page_offset,
1041 blen, cookies + nc, ncookies - nc,
1042 map_perm);
1043 kunmap_atomic(vaddr);
1044 } else {
1045 err = -EMSGSIZE;
1046 }
1047
1048 if (err < 0) {
1049 ldc_unmap(lp, cookies, nc);
1050 return err;
1051 }
1052 nc += err;
1053 }
1054 return nc;
1055 }
1056
1057 static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
1058 {
1059 struct sk_buff *nskb;
1060 int i, len, pad, docopy;
1061
1062 len = skb->len;
1063 pad = 0;
1064 if (len < ETH_ZLEN) {
1065 pad += ETH_ZLEN - skb->len;
1066 len += pad;
1067 }
1068 len += VNET_PACKET_SKIP;
1069 pad += 8 - (len & 7);
1070
1071 /* make sure we have enough cookies and alignment in every frag */
1072 docopy = skb_shinfo(skb)->nr_frags >= ncookies;
1073 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1074 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1075
1076 docopy |= f->page_offset & 7;
1077 }
1078 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
1079 skb_tailroom(skb) < pad ||
1080 skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
1081 int start = 0, offset;
1082 __wsum csum;
1083
1084 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
1085 nskb = alloc_and_align_skb(skb->dev, len);
1086 if (nskb == NULL) {
1087 dev_kfree_skb(skb);
1088 return NULL;
1089 }
1090 skb_reserve(nskb, VNET_PACKET_SKIP);
1091
1092 nskb->protocol = skb->protocol;
1093 offset = skb_mac_header(skb) - skb->data;
1094 skb_set_mac_header(nskb, offset);
1095 offset = skb_network_header(skb) - skb->data;
1096 skb_set_network_header(nskb, offset);
1097 offset = skb_transport_header(skb) - skb->data;
1098 skb_set_transport_header(nskb, offset);
1099
1100 offset = 0;
1101 nskb->csum_offset = skb->csum_offset;
1102 nskb->ip_summed = skb->ip_summed;
1103
1104 if (skb->ip_summed == CHECKSUM_PARTIAL)
1105 start = skb_checksum_start_offset(skb);
1106 if (start) {
1107 struct iphdr *iph = ip_hdr(nskb);
1108 int offset = start + nskb->csum_offset;
1109
1110 if (skb_copy_bits(skb, 0, nskb->data, start)) {
1111 dev_kfree_skb(nskb);
1112 dev_kfree_skb(skb);
1113 return NULL;
1114 }
1115 *(__sum16 *)(skb->data + offset) = 0;
1116 csum = skb_copy_and_csum_bits(skb, start,
1117 nskb->data + start,
1118 skb->len - start, 0);
1119 if (iph->protocol == IPPROTO_TCP ||
1120 iph->protocol == IPPROTO_UDP) {
1121 csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
1122 skb->len - start,
1123 iph->protocol, csum);
1124 }
1125 *(__sum16 *)(nskb->data + offset) = csum;
1126
1127 nskb->ip_summed = CHECKSUM_NONE;
1128 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
1129 dev_kfree_skb(nskb);
1130 dev_kfree_skb(skb);
1131 return NULL;
1132 }
1133 (void)skb_put(nskb, skb->len);
1134 if (skb_is_gso(skb)) {
1135 skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
1136 skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
1137 }
1138 dev_kfree_skb(skb);
1139 skb = nskb;
1140 }
1141 return skb;
1142 }
1143
1144 static u16
1145 vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
1146 void *accel_priv, select_queue_fallback_t fallback)
1147 {
1148 struct vnet *vp = netdev_priv(dev);
1149 struct vnet_port *port = __tx_port_find(vp, skb);
1150
1151 if (port == NULL)
1152 return 0;
1153 return port->q_index;
1154 }
1155
1156 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev);
1157
1158 static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
1159 {
1160 struct net_device *dev = port->vp->dev;
1161 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1162 struct sk_buff *segs;
1163 int maclen, datalen;
1164 int status;
1165 int gso_size, gso_type, gso_segs;
1166 int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1167 int proto = IPPROTO_IP;
1168
1169 if (skb->protocol == htons(ETH_P_IP))
1170 proto = ip_hdr(skb)->protocol;
1171 else if (skb->protocol == htons(ETH_P_IPV6))
1172 proto = ipv6_hdr(skb)->nexthdr;
1173
1174 if (proto == IPPROTO_TCP)
1175 hlen += tcp_hdr(skb)->doff * 4;
1176 else if (proto == IPPROTO_UDP)
1177 hlen += sizeof(struct udphdr);
1178 else {
1179 pr_err("vnet_handle_offloads GSO with unknown transport "
1180 "protocol %d tproto %d\n", skb->protocol, proto);
1181 hlen = 128; /* XXX */
1182 }
1183 datalen = port->tsolen - hlen;
1184
1185 gso_size = skb_shinfo(skb)->gso_size;
1186 gso_type = skb_shinfo(skb)->gso_type;
1187 gso_segs = skb_shinfo(skb)->gso_segs;
1188
1189 if (port->tso && gso_size < datalen)
1190 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1191
1192 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1193 struct netdev_queue *txq;
1194
1195 txq = netdev_get_tx_queue(dev, port->q_index);
1196 netif_tx_stop_queue(txq);
1197 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1198 return NETDEV_TX_BUSY;
1199 netif_tx_wake_queue(txq);
1200 }
1201
1202 maclen = skb_network_header(skb) - skb_mac_header(skb);
1203 skb_pull(skb, maclen);
1204
1205 if (port->tso && gso_size < datalen) {
1206 /* segment to TSO size */
1207 skb_shinfo(skb)->gso_size = datalen;
1208 skb_shinfo(skb)->gso_segs = gso_segs;
1209
1210 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1211
1212 /* restore gso_size & gso_segs */
1213 skb_shinfo(skb)->gso_size = gso_size;
1214 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len - hlen,
1215 gso_size);
1216 } else
1217 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1218 if (IS_ERR(segs)) {
1219 dev->stats.tx_dropped++;
1220 return NETDEV_TX_OK;
1221 }
1222
1223 skb_push(skb, maclen);
1224 skb_reset_mac_header(skb);
1225
1226 status = 0;
1227 while (segs) {
1228 struct sk_buff *curr = segs;
1229
1230 segs = segs->next;
1231 curr->next = NULL;
1232 if (port->tso && curr->len > dev->mtu) {
1233 skb_shinfo(curr)->gso_size = gso_size;
1234 skb_shinfo(curr)->gso_type = gso_type;
1235 skb_shinfo(curr)->gso_segs =
1236 DIV_ROUND_UP(curr->len - hlen, gso_size);
1237 } else
1238 skb_shinfo(curr)->gso_size = 0;
1239
1240 skb_push(curr, maclen);
1241 skb_reset_mac_header(curr);
1242 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1243 maclen);
1244 curr->csum_start = skb_transport_header(curr) - curr->head;
1245 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1246 curr->csum_offset = offsetof(struct tcphdr, check);
1247 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1248 curr->csum_offset = offsetof(struct udphdr, check);
1249
1250 if (!(status & NETDEV_TX_MASK))
1251 status = vnet_start_xmit(curr, dev);
1252 if (status & NETDEV_TX_MASK)
1253 dev_kfree_skb_any(curr);
1254 }
1255
1256 if (!(status & NETDEV_TX_MASK))
1257 dev_kfree_skb_any(skb);
1258 return status;
1259 }
1260
1261 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
1262 {
1263 struct vnet *vp = netdev_priv(dev);
1264 struct vnet_port *port = NULL;
1265 struct vio_dring_state *dr;
1266 struct vio_net_desc *d;
1267 unsigned int len;
1268 struct sk_buff *freeskbs = NULL;
1269 int i, err, txi;
1270 unsigned pending = 0;
1271 struct netdev_queue *txq;
1272
1273 rcu_read_lock();
1274 port = __tx_port_find(vp, skb);
1275 if (unlikely(!port)) {
1276 rcu_read_unlock();
1277 goto out_dropped;
1278 }
1279
1280 if (skb_is_gso(skb) && skb->len > port->tsolen) {
1281 err = vnet_handle_offloads(port, skb);
1282 rcu_read_unlock();
1283 return err;
1284 }
1285
1286 if (!skb_is_gso(skb) && skb->len > port->rmtu) {
1287 unsigned long localmtu = port->rmtu - ETH_HLEN;
1288
1289 if (vio_version_after_eq(&port->vio, 1, 3))
1290 localmtu -= VLAN_HLEN;
1291
1292 if (skb->protocol == htons(ETH_P_IP)) {
1293 struct flowi4 fl4;
1294 struct rtable *rt = NULL;
1295
1296 memset(&fl4, 0, sizeof(fl4));
1297 fl4.flowi4_oif = dev->ifindex;
1298 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
1299 fl4.daddr = ip_hdr(skb)->daddr;
1300 fl4.saddr = ip_hdr(skb)->saddr;
1301
1302 rt = ip_route_output_key(dev_net(dev), &fl4);
1303 rcu_read_unlock();
1304 if (!IS_ERR(rt)) {
1305 skb_dst_set(skb, &rt->dst);
1306 icmp_send(skb, ICMP_DEST_UNREACH,
1307 ICMP_FRAG_NEEDED,
1308 htonl(localmtu));
1309 }
1310 }
1311 #if IS_ENABLED(CONFIG_IPV6)
1312 else if (skb->protocol == htons(ETH_P_IPV6))
1313 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1314 #endif
1315 goto out_dropped;
1316 }
1317
1318 skb = vnet_skb_shape(skb, 2);
1319
1320 if (unlikely(!skb))
1321 goto out_dropped;
1322
1323 if (skb->ip_summed == CHECKSUM_PARTIAL)
1324 vnet_fullcsum(skb);
1325
1326 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1327 i = skb_get_queue_mapping(skb);
1328 txq = netdev_get_tx_queue(dev, i);
1329 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1330 if (!netif_tx_queue_stopped(txq)) {
1331 netif_tx_stop_queue(txq);
1332
1333 /* This is a hard error, log it. */
1334 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1335 dev->stats.tx_errors++;
1336 }
1337 rcu_read_unlock();
1338 return NETDEV_TX_BUSY;
1339 }
1340
1341 d = vio_dring_cur(dr);
1342
1343 txi = dr->prod;
1344
1345 freeskbs = vnet_clean_tx_ring(port, &pending);
1346
1347 BUG_ON(port->tx_bufs[txi].skb);
1348
1349 len = skb->len;
1350 if (len < ETH_ZLEN)
1351 len = ETH_ZLEN;
1352
1353 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1354 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1355 if (err < 0) {
1356 netdev_info(dev, "tx buffer map error %d\n", err);
1357 goto out_dropped;
1358 }
1359
1360 port->tx_bufs[txi].skb = skb;
1361 skb = NULL;
1362 port->tx_bufs[txi].ncookies = err;
1363
1364 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1365 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1366 * the protocol itself does not require it as long as the peer
1367 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1368 *
1369 * An ACK for every packet in the ring is expensive as the
1370 * sending of LDC messages is slow and affects performance.
1371 */
1372 d->hdr.ack = VIO_ACK_DISABLE;
1373 d->size = len;
1374 d->ncookies = port->tx_bufs[txi].ncookies;
1375 for (i = 0; i < d->ncookies; i++)
1376 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1377 if (vio_version_after_eq(&port->vio, 1, 7)) {
1378 struct vio_net_dext *dext = vio_net_ext(d);
1379
1380 memset(dext, 0, sizeof(*dext));
1381 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1382 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1383 ->gso_size;
1384 dext->flags |= VNET_PKT_IPV4_LSO;
1385 }
1386 if (vio_version_after_eq(&port->vio, 1, 8) &&
1387 !port->switch_port) {
1388 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1389 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1390 }
1391 }
1392
1393 /* This has to be a non-SMP write barrier because we are writing
1394 * to memory which is shared with the peer LDOM.
1395 */
1396 wmb();
1397
1398 d->hdr.state = VIO_DESC_READY;
1399
1400 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1401 * to notify the consumer that some descriptors are READY.
1402 * After that "start" trigger, no additional triggers are needed until
1403 * a DRING_STOPPED is received from the consumer. The dr->cons field
1404 * (set up by vnet_ack()) has the value of the next dring index
1405 * that has not yet been ack-ed. We send a "start" trigger here
1406 * if, and only if, start_cons is true (reset it afterward). Conversely,
1407 * vnet_ack() should check if the dring corresponding to cons
1408 * is marked READY, but start_cons was false.
1409 * If so, vnet_ack() should send out the missed "start" trigger.
1410 *
1411 * Note that the wmb() above makes sure the cookies et al. are
1412 * not globally visible before the VIO_DESC_READY, and that the
1413 * stores are ordered correctly by the compiler. The consumer will
1414 * not proceed until the VIO_DESC_READY is visible assuring that
1415 * the consumer does not observe anything related to descriptors
1416 * out of order. The HV trap from the LDC start trigger is the
1417 * producer to consumer announcement that work is available to the
1418 * consumer
1419 */
1420 if (!port->start_cons)
1421 goto ldc_start_done; /* previous trigger suffices */
1422
1423 err = __vnet_tx_trigger(port, dr->cons);
1424 if (unlikely(err < 0)) {
1425 netdev_info(dev, "TX trigger error %d\n", err);
1426 d->hdr.state = VIO_DESC_FREE;
1427 dev->stats.tx_carrier_errors++;
1428 goto out_dropped;
1429 }
1430
1431 ldc_start_done:
1432 port->start_cons = false;
1433
1434 dev->stats.tx_packets++;
1435 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1436
1437 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1438 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1439 netif_tx_stop_queue(txq);
1440 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1441 netif_tx_wake_queue(txq);
1442 }
1443
1444 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1445 rcu_read_unlock();
1446
1447 vnet_free_skbs(freeskbs);
1448
1449 return NETDEV_TX_OK;
1450
1451 out_dropped:
1452 if (pending)
1453 (void)mod_timer(&port->clean_timer,
1454 jiffies + VNET_CLEAN_TIMEOUT);
1455 else if (port)
1456 del_timer(&port->clean_timer);
1457 if (port)
1458 rcu_read_unlock();
1459 if (skb)
1460 dev_kfree_skb(skb);
1461 vnet_free_skbs(freeskbs);
1462 dev->stats.tx_dropped++;
1463 return NETDEV_TX_OK;
1464 }
1465
1466 static void vnet_tx_timeout(struct net_device *dev)
1467 {
1468 /* XXX Implement me XXX */
1469 }
1470
1471 static int vnet_open(struct net_device *dev)
1472 {
1473 netif_carrier_on(dev);
1474 netif_tx_start_all_queues(dev);
1475
1476 return 0;
1477 }
1478
1479 static int vnet_close(struct net_device *dev)
1480 {
1481 netif_tx_stop_all_queues(dev);
1482 netif_carrier_off(dev);
1483
1484 return 0;
1485 }
1486
1487 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1488 {
1489 struct vnet_mcast_entry *m;
1490
1491 for (m = vp->mcast_list; m; m = m->next) {
1492 if (ether_addr_equal(m->addr, addr))
1493 return m;
1494 }
1495 return NULL;
1496 }
1497
1498 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1499 {
1500 struct netdev_hw_addr *ha;
1501
1502 netdev_for_each_mc_addr(ha, dev) {
1503 struct vnet_mcast_entry *m;
1504
1505 m = __vnet_mc_find(vp, ha->addr);
1506 if (m) {
1507 m->hit = 1;
1508 continue;
1509 }
1510
1511 if (!m) {
1512 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1513 if (!m)
1514 continue;
1515 memcpy(m->addr, ha->addr, ETH_ALEN);
1516 m->hit = 1;
1517
1518 m->next = vp->mcast_list;
1519 vp->mcast_list = m;
1520 }
1521 }
1522 }
1523
1524 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1525 {
1526 struct vio_net_mcast_info info;
1527 struct vnet_mcast_entry *m, **pp;
1528 int n_addrs;
1529
1530 memset(&info, 0, sizeof(info));
1531
1532 info.tag.type = VIO_TYPE_CTRL;
1533 info.tag.stype = VIO_SUBTYPE_INFO;
1534 info.tag.stype_env = VNET_MCAST_INFO;
1535 info.tag.sid = vio_send_sid(&port->vio);
1536 info.set = 1;
1537
1538 n_addrs = 0;
1539 for (m = vp->mcast_list; m; m = m->next) {
1540 if (m->sent)
1541 continue;
1542 m->sent = 1;
1543 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1544 m->addr, ETH_ALEN);
1545 if (++n_addrs == VNET_NUM_MCAST) {
1546 info.count = n_addrs;
1547
1548 (void) vio_ldc_send(&port->vio, &info,
1549 sizeof(info));
1550 n_addrs = 0;
1551 }
1552 }
1553 if (n_addrs) {
1554 info.count = n_addrs;
1555 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1556 }
1557
1558 info.set = 0;
1559
1560 n_addrs = 0;
1561 pp = &vp->mcast_list;
1562 while ((m = *pp) != NULL) {
1563 if (m->hit) {
1564 m->hit = 0;
1565 pp = &m->next;
1566 continue;
1567 }
1568
1569 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1570 m->addr, ETH_ALEN);
1571 if (++n_addrs == VNET_NUM_MCAST) {
1572 info.count = n_addrs;
1573 (void) vio_ldc_send(&port->vio, &info,
1574 sizeof(info));
1575 n_addrs = 0;
1576 }
1577
1578 *pp = m->next;
1579 kfree(m);
1580 }
1581 if (n_addrs) {
1582 info.count = n_addrs;
1583 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1584 }
1585 }
1586
1587 static void vnet_set_rx_mode(struct net_device *dev)
1588 {
1589 struct vnet *vp = netdev_priv(dev);
1590 struct vnet_port *port;
1591
1592 rcu_read_lock();
1593 list_for_each_entry_rcu(port, &vp->port_list, list) {
1594
1595 if (port->switch_port) {
1596 __update_mc_list(vp, dev);
1597 __send_mc_list(vp, port);
1598 break;
1599 }
1600 }
1601 rcu_read_unlock();
1602 }
1603
1604 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
1605 {
1606 if (new_mtu < 68 || new_mtu > 65535)
1607 return -EINVAL;
1608
1609 dev->mtu = new_mtu;
1610 return 0;
1611 }
1612
1613 static int vnet_set_mac_addr(struct net_device *dev, void *p)
1614 {
1615 return -EINVAL;
1616 }
1617
1618 static void vnet_get_drvinfo(struct net_device *dev,
1619 struct ethtool_drvinfo *info)
1620 {
1621 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
1622 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
1623 }
1624
1625 static u32 vnet_get_msglevel(struct net_device *dev)
1626 {
1627 struct vnet *vp = netdev_priv(dev);
1628 return vp->msg_enable;
1629 }
1630
1631 static void vnet_set_msglevel(struct net_device *dev, u32 value)
1632 {
1633 struct vnet *vp = netdev_priv(dev);
1634 vp->msg_enable = value;
1635 }
1636
1637 static const struct ethtool_ops vnet_ethtool_ops = {
1638 .get_drvinfo = vnet_get_drvinfo,
1639 .get_msglevel = vnet_get_msglevel,
1640 .set_msglevel = vnet_set_msglevel,
1641 .get_link = ethtool_op_get_link,
1642 };
1643
1644 static void vnet_port_free_tx_bufs(struct vnet_port *port)
1645 {
1646 struct vio_dring_state *dr;
1647 int i;
1648
1649 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1650 if (dr->base) {
1651 ldc_free_exp_dring(port->vio.lp, dr->base,
1652 (dr->entry_size * dr->num_entries),
1653 dr->cookies, dr->ncookies);
1654 dr->base = NULL;
1655 dr->entry_size = 0;
1656 dr->num_entries = 0;
1657 dr->pending = 0;
1658 dr->ncookies = 0;
1659 }
1660
1661 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1662 struct vio_net_desc *d;
1663 void *skb = port->tx_bufs[i].skb;
1664
1665 if (!skb)
1666 continue;
1667
1668 d = vio_dring_entry(dr, i);
1669 if (d->hdr.state == VIO_DESC_READY)
1670 pr_warn("active transmit buffers freed\n");
1671
1672 ldc_unmap(port->vio.lp,
1673 port->tx_bufs[i].cookies,
1674 port->tx_bufs[i].ncookies);
1675 dev_kfree_skb(skb);
1676 port->tx_bufs[i].skb = NULL;
1677 d->hdr.state = VIO_DESC_FREE;
1678 }
1679 }
1680
1681 static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1682 {
1683 struct vio_dring_state *dr;
1684 unsigned long len, elen;
1685 int i, err, ncookies;
1686 void *dring;
1687
1688 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1689
1690 elen = sizeof(struct vio_net_desc) +
1691 sizeof(struct ldc_trans_cookie) * 2;
1692 if (vio_version_after_eq(&port->vio, 1, 7))
1693 elen += sizeof(struct vio_net_dext);
1694 len = VNET_TX_RING_SIZE * elen;
1695
1696 ncookies = VIO_MAX_RING_COOKIES;
1697 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1698 dr->cookies, &ncookies,
1699 (LDC_MAP_SHADOW |
1700 LDC_MAP_DIRECT |
1701 LDC_MAP_RW));
1702 if (IS_ERR(dring)) {
1703 err = PTR_ERR(dring);
1704 goto err_out;
1705 }
1706
1707 dr->base = dring;
1708 dr->entry_size = elen;
1709 dr->num_entries = VNET_TX_RING_SIZE;
1710 dr->prod = dr->cons = 0;
1711 port->start_cons = true; /* need an initial trigger */
1712 dr->pending = VNET_TX_RING_SIZE;
1713 dr->ncookies = ncookies;
1714
1715 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1716 struct vio_net_desc *d;
1717
1718 d = vio_dring_entry(dr, i);
1719 d->hdr.state = VIO_DESC_FREE;
1720 }
1721 return 0;
1722
1723 err_out:
1724 vnet_port_free_tx_bufs(port);
1725
1726 return err;
1727 }
1728
1729 #ifdef CONFIG_NET_POLL_CONTROLLER
1730 static void vnet_poll_controller(struct net_device *dev)
1731 {
1732 struct vnet *vp = netdev_priv(dev);
1733 struct vnet_port *port;
1734 unsigned long flags;
1735
1736 spin_lock_irqsave(&vp->lock, flags);
1737 if (!list_empty(&vp->port_list)) {
1738 port = list_entry(vp->port_list.next, struct vnet_port, list);
1739 napi_schedule(&port->napi);
1740 }
1741 spin_unlock_irqrestore(&vp->lock, flags);
1742 }
1743 #endif
1744 static LIST_HEAD(vnet_list);
1745 static DEFINE_MUTEX(vnet_list_mutex);
1746
1747 static const struct net_device_ops vnet_ops = {
1748 .ndo_open = vnet_open,
1749 .ndo_stop = vnet_close,
1750 .ndo_set_rx_mode = vnet_set_rx_mode,
1751 .ndo_set_mac_address = vnet_set_mac_addr,
1752 .ndo_validate_addr = eth_validate_addr,
1753 .ndo_tx_timeout = vnet_tx_timeout,
1754 .ndo_change_mtu = vnet_change_mtu,
1755 .ndo_start_xmit = vnet_start_xmit,
1756 .ndo_select_queue = vnet_select_queue,
1757 #ifdef CONFIG_NET_POLL_CONTROLLER
1758 .ndo_poll_controller = vnet_poll_controller,
1759 #endif
1760 };
1761
1762 static struct vnet *vnet_new(const u64 *local_mac)
1763 {
1764 struct net_device *dev;
1765 struct vnet *vp;
1766 int err, i;
1767
1768 dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
1769 if (!dev)
1770 return ERR_PTR(-ENOMEM);
1771 dev->needed_headroom = VNET_PACKET_SKIP + 8;
1772 dev->needed_tailroom = 8;
1773
1774 for (i = 0; i < ETH_ALEN; i++)
1775 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1776
1777 vp = netdev_priv(dev);
1778
1779 spin_lock_init(&vp->lock);
1780 vp->dev = dev;
1781
1782 INIT_LIST_HEAD(&vp->port_list);
1783 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1784 INIT_HLIST_HEAD(&vp->port_hash[i]);
1785 INIT_LIST_HEAD(&vp->list);
1786 vp->local_mac = *local_mac;
1787
1788 dev->netdev_ops = &vnet_ops;
1789 dev->ethtool_ops = &vnet_ethtool_ops;
1790 dev->watchdog_timeo = VNET_TX_TIMEOUT;
1791
1792 dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
1793 NETIF_F_HW_CSUM | NETIF_F_SG;
1794 dev->features = dev->hw_features;
1795
1796 err = register_netdev(dev);
1797 if (err) {
1798 pr_err("Cannot register net device, aborting\n");
1799 goto err_out_free_dev;
1800 }
1801
1802 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
1803
1804 list_add(&vp->list, &vnet_list);
1805
1806 return vp;
1807
1808 err_out_free_dev:
1809 free_netdev(dev);
1810
1811 return ERR_PTR(err);
1812 }
1813
1814 static struct vnet *vnet_find_or_create(const u64 *local_mac)
1815 {
1816 struct vnet *iter, *vp;
1817
1818 mutex_lock(&vnet_list_mutex);
1819 vp = NULL;
1820 list_for_each_entry(iter, &vnet_list, list) {
1821 if (iter->local_mac == *local_mac) {
1822 vp = iter;
1823 break;
1824 }
1825 }
1826 if (!vp)
1827 vp = vnet_new(local_mac);
1828 mutex_unlock(&vnet_list_mutex);
1829
1830 return vp;
1831 }
1832
1833 static void vnet_cleanup(void)
1834 {
1835 struct vnet *vp;
1836 struct net_device *dev;
1837
1838 mutex_lock(&vnet_list_mutex);
1839 while (!list_empty(&vnet_list)) {
1840 vp = list_first_entry(&vnet_list, struct vnet, list);
1841 list_del(&vp->list);
1842 dev = vp->dev;
1843 /* vio_unregister_driver() should have cleaned up port_list */
1844 BUG_ON(!list_empty(&vp->port_list));
1845 unregister_netdev(dev);
1846 free_netdev(dev);
1847 }
1848 mutex_unlock(&vnet_list_mutex);
1849 }
1850
1851 static const char *local_mac_prop = "local-mac-address";
1852
1853 static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
1854 u64 port_node)
1855 {
1856 const u64 *local_mac = NULL;
1857 u64 a;
1858
1859 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1860 u64 target = mdesc_arc_target(hp, a);
1861 const char *name;
1862
1863 name = mdesc_get_property(hp, target, "name", NULL);
1864 if (!name || strcmp(name, "network"))
1865 continue;
1866
1867 local_mac = mdesc_get_property(hp, target,
1868 local_mac_prop, NULL);
1869 if (local_mac)
1870 break;
1871 }
1872 if (!local_mac)
1873 return ERR_PTR(-ENODEV);
1874
1875 return vnet_find_or_create(local_mac);
1876 }
1877
1878 static struct ldc_channel_config vnet_ldc_cfg = {
1879 .event = vnet_event,
1880 .mtu = 64,
1881 .mode = LDC_MODE_UNRELIABLE,
1882 };
1883
1884 static struct vio_driver_ops vnet_vio_ops = {
1885 .send_attr = vnet_send_attr,
1886 .handle_attr = vnet_handle_attr,
1887 .handshake_complete = vnet_handshake_complete,
1888 };
1889
1890 static void print_version(void)
1891 {
1892 printk_once(KERN_INFO "%s", version);
1893 }
1894
1895 const char *remote_macaddr_prop = "remote-mac-address";
1896
1897 static void
1898 vnet_port_add_txq(struct vnet_port *port)
1899 {
1900 struct vnet *vp = port->vp;
1901 int n;
1902
1903 n = vp->nports++;
1904 n = n & (VNET_MAX_TXQS - 1);
1905 port->q_index = n;
1906 netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index));
1907 }
1908
1909 static void
1910 vnet_port_rm_txq(struct vnet_port *port)
1911 {
1912 port->vp->nports--;
1913 netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
1914 }
1915
1916 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1917 {
1918 struct mdesc_handle *hp;
1919 struct vnet_port *port;
1920 unsigned long flags;
1921 struct vnet *vp;
1922 const u64 *rmac;
1923 int len, i, err, switch_port;
1924
1925 print_version();
1926
1927 hp = mdesc_grab();
1928
1929 vp = vnet_find_parent(hp, vdev->mp);
1930 if (IS_ERR(vp)) {
1931 pr_err("Cannot find port parent vnet\n");
1932 err = PTR_ERR(vp);
1933 goto err_out_put_mdesc;
1934 }
1935
1936 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1937 err = -ENODEV;
1938 if (!rmac) {
1939 pr_err("Port lacks %s property\n", remote_macaddr_prop);
1940 goto err_out_put_mdesc;
1941 }
1942
1943 port = kzalloc(sizeof(*port), GFP_KERNEL);
1944 err = -ENOMEM;
1945 if (!port)
1946 goto err_out_put_mdesc;
1947
1948 for (i = 0; i < ETH_ALEN; i++)
1949 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1950
1951 port->vp = vp;
1952
1953 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1954 vnet_versions, ARRAY_SIZE(vnet_versions),
1955 &vnet_vio_ops, vp->dev->name);
1956 if (err)
1957 goto err_out_free_port;
1958
1959 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1960 if (err)
1961 goto err_out_free_port;
1962
1963 netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT);
1964
1965 INIT_HLIST_NODE(&port->hash);
1966 INIT_LIST_HEAD(&port->list);
1967
1968 switch_port = 0;
1969 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1970 switch_port = 1;
1971 port->switch_port = switch_port;
1972 port->tso = true;
1973 port->tsolen = 0;
1974
1975 spin_lock_irqsave(&vp->lock, flags);
1976 if (switch_port)
1977 list_add_rcu(&port->list, &vp->port_list);
1978 else
1979 list_add_tail_rcu(&port->list, &vp->port_list);
1980 hlist_add_head_rcu(&port->hash,
1981 &vp->port_hash[vnet_hashfn(port->raddr)]);
1982 vnet_port_add_txq(port);
1983 spin_unlock_irqrestore(&vp->lock, flags);
1984
1985 dev_set_drvdata(&vdev->dev, port);
1986
1987 pr_info("%s: PORT ( remote-mac %pM%s )\n",
1988 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
1989
1990 setup_timer(&port->clean_timer, vnet_clean_timer_expire,
1991 (unsigned long)port);
1992
1993 napi_enable(&port->napi);
1994 vio_port_up(&port->vio);
1995
1996 mdesc_release(hp);
1997
1998 return 0;
1999
2000 err_out_free_port:
2001 kfree(port);
2002
2003 err_out_put_mdesc:
2004 mdesc_release(hp);
2005 return err;
2006 }
2007
2008 static int vnet_port_remove(struct vio_dev *vdev)
2009 {
2010 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
2011
2012 if (port) {
2013
2014 del_timer_sync(&port->vio.timer);
2015
2016 napi_disable(&port->napi);
2017
2018 list_del_rcu(&port->list);
2019 hlist_del_rcu(&port->hash);
2020
2021 synchronize_rcu();
2022 del_timer_sync(&port->clean_timer);
2023 vnet_port_rm_txq(port);
2024 netif_napi_del(&port->napi);
2025 vnet_port_free_tx_bufs(port);
2026 vio_ldc_free(&port->vio);
2027
2028 dev_set_drvdata(&vdev->dev, NULL);
2029
2030 kfree(port);
2031
2032 }
2033 return 0;
2034 }
2035
2036 static const struct vio_device_id vnet_port_match[] = {
2037 {
2038 .type = "vnet-port",
2039 },
2040 {},
2041 };
2042 MODULE_DEVICE_TABLE(vio, vnet_port_match);
2043
2044 static struct vio_driver vnet_port_driver = {
2045 .id_table = vnet_port_match,
2046 .probe = vnet_port_probe,
2047 .remove = vnet_port_remove,
2048 .name = "vnet_port",
2049 };
2050
2051 static int __init vnet_init(void)
2052 {
2053 return vio_register_driver(&vnet_port_driver);
2054 }
2055
2056 static void __exit vnet_exit(void)
2057 {
2058 vio_unregister_driver(&vnet_port_driver);
2059 vnet_cleanup();
2060 }
2061
2062 module_init(vnet_init);
2063 module_exit(vnet_exit);
Linux kernel - Deliverables
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