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1/* sunvnet.c: Sun LDOM Virtual Network Driver.
2 *
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
4 * Copyright (C) 2016 Oracle. All rights reserved.
5 */
6
7#include <linux/module.h>
8#include <linux/kernel.h>
9#include <linux/types.h>
10#include <linux/slab.h>
11#include <linux/delay.h>
12#include <linux/init.h>
13#include <linux/netdevice.h>
14#include <linux/ethtool.h>
15#include <linux/etherdevice.h>
16#include <linux/mutex.h>
17#include <linux/highmem.h>
18#include <linux/if_vlan.h>
19#define CREATE_TRACE_POINTS
20#include <trace/events/sunvnet.h>
21
22#if IS_ENABLED(CONFIG_IPV6)
23#include <linux/icmpv6.h>
24#endif
25
26#include <net/ip.h>
27#include <net/icmp.h>
28#include <net/route.h>
29
30#include <asm/vio.h>
31#include <asm/ldc.h>
32
33#include "sunvnet_common.h"
34
35/* Heuristic for the number of times to exponentially backoff and
36 * retry sending an LDC trigger when EAGAIN is encountered
37 */
38#define VNET_MAX_RETRIES 10
39
40static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
41static void vnet_port_reset(struct vnet_port *port);
42
43static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
44{
45 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
46}
47
48static int vnet_handle_unknown(struct vnet_port *port, void *arg)
49{
50 struct vio_msg_tag *pkt = arg;
51
52 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
53 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
54 pr_err("Resetting connection\n");
55
56 ldc_disconnect(port->vio.lp);
57
58 return -ECONNRESET;
59}
60
61static int vnet_port_alloc_tx_ring(struct vnet_port *port);
62
63int sunvnet_send_attr_common(struct vio_driver_state *vio)
64{
65 struct vnet_port *port = to_vnet_port(vio);
66 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
67 struct vio_net_attr_info pkt;
68 int framelen = ETH_FRAME_LEN;
69 int i, err;
70
71 err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
72 if (err)
73 return err;
74
75 memset(&pkt, 0, sizeof(pkt));
76 pkt.tag.type = VIO_TYPE_CTRL;
77 pkt.tag.stype = VIO_SUBTYPE_INFO;
78 pkt.tag.stype_env = VIO_ATTR_INFO;
79 pkt.tag.sid = vio_send_sid(vio);
80 if (vio_version_before(vio, 1, 2))
81 pkt.xfer_mode = VIO_DRING_MODE;
82 else
83 pkt.xfer_mode = VIO_NEW_DRING_MODE;
84 pkt.addr_type = VNET_ADDR_ETHERMAC;
85 pkt.ack_freq = 0;
86 for (i = 0; i < 6; i++)
87 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
88 if (vio_version_after(vio, 1, 3)) {
89 if (port->rmtu) {
90 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
91 pkt.mtu = port->rmtu;
92 } else {
93 port->rmtu = VNET_MAXPACKET;
94 pkt.mtu = port->rmtu;
95 }
96 if (vio_version_after_eq(vio, 1, 6))
97 pkt.options = VIO_TX_DRING;
98 } else if (vio_version_before(vio, 1, 3)) {
99 pkt.mtu = framelen;
100 } else { /* v1.3 */
101 pkt.mtu = framelen + VLAN_HLEN;
102 }
103
104 pkt.cflags = 0;
105 if (vio_version_after_eq(vio, 1, 7) && port->tso) {
106 pkt.cflags |= VNET_LSO_IPV4_CAPAB;
107 if (!port->tsolen)
108 port->tsolen = VNET_MAXTSO;
109 pkt.ipv4_lso_maxlen = port->tsolen;
110 }
111
112 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
113
114 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
115 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
116 "cflags[0x%04x] lso_max[%u]\n",
117 pkt.xfer_mode, pkt.addr_type,
118 (unsigned long long)pkt.addr,
119 pkt.ack_freq, pkt.plnk_updt, pkt.options,
120 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
121
122 return vio_ldc_send(vio, &pkt, sizeof(pkt));
123}
124EXPORT_SYMBOL_GPL(sunvnet_send_attr_common);
125
126static int handle_attr_info(struct vio_driver_state *vio,
127 struct vio_net_attr_info *pkt)
128{
129 struct vnet_port *port = to_vnet_port(vio);
130 u64 localmtu;
131 u8 xfer_mode;
132
133 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
134 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
135 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
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, port->rmtu, pkt->cflags,
140 pkt->ipv4_lso_maxlen);
141
142 pkt->tag.sid = vio_send_sid(vio);
143
144 xfer_mode = pkt->xfer_mode;
145 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
146 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
147 xfer_mode = VIO_NEW_DRING_MODE;
148
149 /* MTU negotiation:
150 * < v1.3 - ETH_FRAME_LEN exactly
151 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
152 * pkt->mtu for ACK
153 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
154 */
155 if (vio_version_before(vio, 1, 3)) {
156 localmtu = ETH_FRAME_LEN;
157 } else if (vio_version_after(vio, 1, 3)) {
158 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
159 localmtu = min(pkt->mtu, localmtu);
160 pkt->mtu = localmtu;
161 } else { /* v1.3 */
162 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
163 }
164 port->rmtu = localmtu;
165
166 /* LSO negotiation */
167 if (vio_version_after_eq(vio, 1, 7))
168 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
169 else
170 port->tso = false;
171 if (port->tso) {
172 if (!port->tsolen)
173 port->tsolen = VNET_MAXTSO;
174 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
175 if (port->tsolen < VNET_MINTSO) {
176 port->tso = false;
177 port->tsolen = 0;
178 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
179 }
180 pkt->ipv4_lso_maxlen = port->tsolen;
181 } else {
182 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
183 pkt->ipv4_lso_maxlen = 0;
184 }
185
186 /* for version >= 1.6, ACK packet mode we support */
187 if (vio_version_after_eq(vio, 1, 6)) {
188 pkt->xfer_mode = VIO_NEW_DRING_MODE;
189 pkt->options = VIO_TX_DRING;
190 }
191
192 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
193 pkt->addr_type != VNET_ADDR_ETHERMAC ||
194 pkt->mtu != localmtu) {
195 viodbg(HS, "SEND NET ATTR NACK\n");
196
197 pkt->tag.stype = VIO_SUBTYPE_NACK;
198
199 (void)vio_ldc_send(vio, pkt, sizeof(*pkt));
200
201 return -ECONNRESET;
202 }
203
204 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
205 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
206 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
207 pkt->xfer_mode, pkt->addr_type,
208 (unsigned long long)pkt->addr,
209 pkt->ack_freq, pkt->plnk_updt, pkt->options,
210 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
211 pkt->ipv4_lso_maxlen);
212
213 pkt->tag.stype = VIO_SUBTYPE_ACK;
214
215 return vio_ldc_send(vio, pkt, sizeof(*pkt));
216}
217
218static int handle_attr_ack(struct vio_driver_state *vio,
219 struct vio_net_attr_info *pkt)
220{
221 viodbg(HS, "GOT NET ATTR ACK\n");
222
223 return 0;
224}
225
226static int handle_attr_nack(struct vio_driver_state *vio,
227 struct vio_net_attr_info *pkt)
228{
229 viodbg(HS, "GOT NET ATTR NACK\n");
230
231 return -ECONNRESET;
232}
233
234int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg)
235{
236 struct vio_net_attr_info *pkt = arg;
237
238 switch (pkt->tag.stype) {
239 case VIO_SUBTYPE_INFO:
240 return handle_attr_info(vio, pkt);
241
242 case VIO_SUBTYPE_ACK:
243 return handle_attr_ack(vio, pkt);
244
245 case VIO_SUBTYPE_NACK:
246 return handle_attr_nack(vio, pkt);
247
248 default:
249 return -ECONNRESET;
250 }
251}
252EXPORT_SYMBOL_GPL(sunvnet_handle_attr_common);
253
254void sunvnet_handshake_complete_common(struct vio_driver_state *vio)
255{
256 struct vio_dring_state *dr;
257
258 dr = &vio->drings[VIO_DRIVER_RX_RING];
259 dr->rcv_nxt = 1;
260 dr->snd_nxt = 1;
261
262 dr = &vio->drings[VIO_DRIVER_TX_RING];
263 dr->rcv_nxt = 1;
264 dr->snd_nxt = 1;
265}
266EXPORT_SYMBOL_GPL(sunvnet_handshake_complete_common);
267
268/* The hypervisor interface that implements copying to/from imported
269 * memory from another domain requires that copies are done to 8-byte
270 * aligned buffers, and that the lengths of such copies are also 8-byte
271 * multiples.
272 *
273 * So we align skb->data to an 8-byte multiple and pad-out the data
274 * area so we can round the copy length up to the next multiple of
275 * 8 for the copy.
276 *
277 * The transmitter puts the actual start of the packet 6 bytes into
278 * the buffer it sends over, so that the IP headers after the ethernet
279 * header are aligned properly. These 6 bytes are not in the descriptor
280 * length, they are simply implied. This offset is represented using
281 * the VNET_PACKET_SKIP macro.
282 */
283static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
284 unsigned int len)
285{
286 struct sk_buff *skb;
287 unsigned long addr, off;
288
289 skb = netdev_alloc_skb(dev, len + VNET_PACKET_SKIP + 8 + 8);
290 if (unlikely(!skb))
291 return NULL;
292
293 addr = (unsigned long)skb->data;
294 off = ((addr + 7UL) & ~7UL) - addr;
295 if (off)
296 skb_reserve(skb, off);
297
298 return skb;
299}
300
301static inline void vnet_fullcsum(struct sk_buff *skb)
302{
303 struct iphdr *iph = ip_hdr(skb);
304 int offset = skb_transport_offset(skb);
305
306 if (skb->protocol != htons(ETH_P_IP))
307 return;
308 if (iph->protocol != IPPROTO_TCP &&
309 iph->protocol != IPPROTO_UDP)
310 return;
311 skb->ip_summed = CHECKSUM_NONE;
312 skb->csum_level = 1;
313 skb->csum = 0;
314 if (iph->protocol == IPPROTO_TCP) {
315 struct tcphdr *ptcp = tcp_hdr(skb);
316
317 ptcp->check = 0;
318 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
319 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
320 skb->len - offset, IPPROTO_TCP,
321 skb->csum);
322 } else if (iph->protocol == IPPROTO_UDP) {
323 struct udphdr *pudp = udp_hdr(skb);
324
325 pudp->check = 0;
326 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
327 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
328 skb->len - offset, IPPROTO_UDP,
329 skb->csum);
330 }
331}
332
333static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
334{
335 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
336 unsigned int len = desc->size;
337 unsigned int copy_len;
338 struct sk_buff *skb;
339 int maxlen;
340 int err;
341
342 err = -EMSGSIZE;
343 if (port->tso && port->tsolen > port->rmtu)
344 maxlen = port->tsolen;
345 else
346 maxlen = port->rmtu;
347 if (unlikely(len < ETH_ZLEN || len > maxlen)) {
348 dev->stats.rx_length_errors++;
349 goto out_dropped;
350 }
351
352 skb = alloc_and_align_skb(dev, len);
353 err = -ENOMEM;
354 if (unlikely(!skb)) {
355 dev->stats.rx_missed_errors++;
356 goto out_dropped;
357 }
358
359 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
360 skb_put(skb, copy_len);
361 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
362 skb->data, copy_len, 0,
363 desc->cookies, desc->ncookies);
364 if (unlikely(err < 0)) {
365 dev->stats.rx_frame_errors++;
366 goto out_free_skb;
367 }
368
369 skb_pull(skb, VNET_PACKET_SKIP);
370 skb_trim(skb, len);
371 skb->protocol = eth_type_trans(skb, dev);
372
373 if (vio_version_after_eq(&port->vio, 1, 8)) {
374 struct vio_net_dext *dext = vio_net_ext(desc);
375
376 skb_reset_network_header(skb);
377
378 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
379 if (skb->protocol == ETH_P_IP) {
380 struct iphdr *iph = ip_hdr(skb);
381
382 iph->check = 0;
383 ip_send_check(iph);
384 }
385 }
386 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
387 skb->ip_summed == CHECKSUM_NONE) {
388 if (skb->protocol == htons(ETH_P_IP)) {
389 struct iphdr *iph = ip_hdr(skb);
390 int ihl = iph->ihl * 4;
391
392 skb_reset_transport_header(skb);
393 skb_set_transport_header(skb, ihl);
394 vnet_fullcsum(skb);
395 }
396 }
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
412out_free_skb:
413 kfree_skb(skb);
414
415out_dropped:
416 dev->stats.rx_dropped++;
417 return err;
418}
419
420static 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
469static 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
485static 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
501static 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);
510 if (IS_ERR(desc))
511 return PTR_ERR(desc);
512
513 if (desc->hdr.state != VIO_DESC_READY)
514 return 1;
515
516 dma_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 trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
528 index, desc->hdr.ack);
529 desc->hdr.state = VIO_DESC_DONE;
530 err = put_rx_desc(port, dr, desc, index);
531 if (err < 0)
532 return err;
533 *needs_ack = desc->hdr.ack;
534 return 0;
535}
536
537static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
538 u32 start, u32 end, int *npkts, int budget)
539{
540 struct vio_driver_state *vio = &port->vio;
541 int ack_start = -1, ack_end = -1;
542 bool send_ack = true;
543
544 end = (end == (u32)-1) ? vio_dring_prev(dr, start)
545 : vio_dring_next(dr, end);
546
547 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
548
549 while (start != end) {
550 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
551
552 if (err == -ECONNRESET)
553 return err;
554 if (err != 0)
555 break;
556 (*npkts)++;
557 if (ack_start == -1)
558 ack_start = start;
559 ack_end = start;
560 start = vio_dring_next(dr, start);
561 if (ack && start != end) {
562 err = vnet_send_ack(port, dr, ack_start, ack_end,
563 VIO_DRING_ACTIVE);
564 if (err == -ECONNRESET)
565 return err;
566 ack_start = -1;
567 }
568 if ((*npkts) >= budget) {
569 send_ack = false;
570 break;
571 }
572 }
573 if (unlikely(ack_start == -1)) {
574 ack_end = vio_dring_prev(dr, start);
575 ack_start = ack_end;
576 }
577 if (send_ack) {
578 port->napi_resume = false;
579 trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
580 port->vio._peer_sid,
581 ack_end, *npkts);
582 return vnet_send_ack(port, dr, ack_start, ack_end,
583 VIO_DRING_STOPPED);
584 } else {
585 trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
586 port->vio._peer_sid,
587 ack_end, *npkts);
588 port->napi_resume = true;
589 port->napi_stop_idx = ack_end;
590 return 1;
591 }
592}
593
594static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
595 int budget)
596{
597 struct vio_dring_data *pkt = msgbuf;
598 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
599 struct vio_driver_state *vio = &port->vio;
600
601 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
602 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
603
604 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
605 return 0;
606 if (unlikely(pkt->seq != dr->rcv_nxt)) {
607 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
608 pkt->seq, dr->rcv_nxt);
609 return 0;
610 }
611
612 if (!port->napi_resume)
613 dr->rcv_nxt++;
614
615 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
616
617 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
618 npkts, budget);
619}
620
621static int idx_is_pending(struct vio_dring_state *dr, u32 end)
622{
623 u32 idx = dr->cons;
624 int found = 0;
625
626 while (idx != dr->prod) {
627 if (idx == end) {
628 found = 1;
629 break;
630 }
631 idx = vio_dring_next(dr, idx);
632 }
633 return found;
634}
635
636static int vnet_ack(struct vnet_port *port, void *msgbuf)
637{
638 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
639 struct vio_dring_data *pkt = msgbuf;
640 struct net_device *dev;
641 u32 end;
642 struct vio_net_desc *desc;
643 struct netdev_queue *txq;
644
645 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
646 return 0;
647
648 end = pkt->end_idx;
649 dev = VNET_PORT_TO_NET_DEVICE(port);
650 netif_tx_lock(dev);
651 if (unlikely(!idx_is_pending(dr, end))) {
652 netif_tx_unlock(dev);
653 return 0;
654 }
655
656 /* sync for race conditions with vnet_start_xmit() and tell xmit it
657 * is time to send a trigger.
658 */
659 trace_vnet_rx_stopped_ack(port->vio._local_sid,
660 port->vio._peer_sid, end);
661 dr->cons = vio_dring_next(dr, end);
662 desc = vio_dring_entry(dr, dr->cons);
663 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
664 /* vnet_start_xmit() just populated this dring but missed
665 * sending the "start" LDC message to the consumer.
666 * Send a "start" trigger on its behalf.
667 */
668 if (__vnet_tx_trigger(port, dr->cons) > 0)
669 port->start_cons = false;
670 else
671 port->start_cons = true;
672 } else {
673 port->start_cons = true;
674 }
675 netif_tx_unlock(dev);
676
677 txq = netdev_get_tx_queue(dev, port->q_index);
678 if (unlikely(netif_tx_queue_stopped(txq) &&
679 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
680 return 1;
681
682 return 0;
683}
684
685static int vnet_nack(struct vnet_port *port, void *msgbuf)
686{
687 /* XXX just reset or similar XXX */
688 return 0;
689}
690
691static int handle_mcast(struct vnet_port *port, void *msgbuf)
692{
693 struct vio_net_mcast_info *pkt = msgbuf;
694 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
695
696 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
697 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
698 dev->name,
699 pkt->tag.type,
700 pkt->tag.stype,
701 pkt->tag.stype_env,
702 pkt->tag.sid);
703
704 return 0;
705}
706
707/* Got back a STOPPED LDC message on port. If the queue is stopped,
708 * wake it up so that we'll send out another START message at the
709 * next TX.
710 */
711static void maybe_tx_wakeup(struct vnet_port *port)
712{
713 struct netdev_queue *txq;
714
715 txq = netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
716 port->q_index);
717 __netif_tx_lock(txq, smp_processor_id());
718 if (likely(netif_tx_queue_stopped(txq))) {
719 struct vio_dring_state *dr;
720
721 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
722 netif_tx_wake_queue(txq);
723 }
724 __netif_tx_unlock(txq);
725}
726
727bool sunvnet_port_is_up_common(struct vnet_port *vnet)
728{
729 struct vio_driver_state *vio = &vnet->vio;
730
731 return !!(vio->hs_state & VIO_HS_COMPLETE);
732}
733EXPORT_SYMBOL_GPL(sunvnet_port_is_up_common);
734
735static int vnet_event_napi(struct vnet_port *port, int budget)
736{
737 struct vio_driver_state *vio = &port->vio;
738 int tx_wakeup, err;
739 int npkts = 0;
740 int event = (port->rx_event & LDC_EVENT_RESET);
741
742ldc_ctrl:
743 if (unlikely(event == LDC_EVENT_RESET ||
744 event == LDC_EVENT_UP)) {
745 vio_link_state_change(vio, event);
746
747 if (event == LDC_EVENT_RESET) {
748 vnet_port_reset(port);
749 vio_port_up(vio);
750 }
751 port->rx_event = 0;
752 return 0;
753 }
754 /* We may have multiple LDC events in rx_event. Unroll send_events() */
755 event = (port->rx_event & LDC_EVENT_UP);
756 port->rx_event &= ~(LDC_EVENT_RESET | LDC_EVENT_UP);
757 if (event == LDC_EVENT_UP)
758 goto ldc_ctrl;
759 event = port->rx_event;
760 if (!(event & LDC_EVENT_DATA_READY))
761 return 0;
762
763 /* we dont expect any other bits than RESET, UP, DATA_READY */
764 BUG_ON(event != LDC_EVENT_DATA_READY);
765
766 err = 0;
767 tx_wakeup = 0;
768 while (1) {
769 union {
770 struct vio_msg_tag tag;
771 u64 raw[8];
772 } msgbuf;
773
774 if (port->napi_resume) {
775 struct vio_dring_data *pkt =
776 (struct vio_dring_data *)&msgbuf;
777 struct vio_dring_state *dr =
778 &port->vio.drings[VIO_DRIVER_RX_RING];
779
780 pkt->tag.type = VIO_TYPE_DATA;
781 pkt->tag.stype = VIO_SUBTYPE_INFO;
782 pkt->tag.stype_env = VIO_DRING_DATA;
783 pkt->seq = dr->rcv_nxt;
784 pkt->start_idx = vio_dring_next(dr,
785 port->napi_stop_idx);
786 pkt->end_idx = -1;
787 goto napi_resume;
788 }
789 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
790 if (unlikely(err < 0)) {
791 if (err == -ECONNRESET)
792 vio_conn_reset(vio);
793 break;
794 }
795 if (err == 0)
796 break;
797 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
798 msgbuf.tag.type,
799 msgbuf.tag.stype,
800 msgbuf.tag.stype_env,
801 msgbuf.tag.sid);
802 err = vio_validate_sid(vio, &msgbuf.tag);
803 if (err < 0)
804 break;
805napi_resume:
806 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
807 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
808 if (!sunvnet_port_is_up_common(port)) {
809 /* failures like handshake_failure()
810 * may have cleaned up dring, but
811 * NAPI polling may bring us here.
812 */
813 err = -ECONNRESET;
814 break;
815 }
816 err = vnet_rx(port, &msgbuf, &npkts, budget);
817 if (npkts >= budget)
818 break;
819 if (npkts == 0)
820 break;
821 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
822 err = vnet_ack(port, &msgbuf);
823 if (err > 0)
824 tx_wakeup |= err;
825 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
826 err = vnet_nack(port, &msgbuf);
827 }
828 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
829 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
830 err = handle_mcast(port, &msgbuf);
831 else
832 err = vio_control_pkt_engine(vio, &msgbuf);
833 if (err)
834 break;
835 } else {
836 err = vnet_handle_unknown(port, &msgbuf);
837 }
838 if (err == -ECONNRESET)
839 break;
840 }
841 if (unlikely(tx_wakeup && err != -ECONNRESET))
842 maybe_tx_wakeup(port);
843 return npkts;
844}
845
846int sunvnet_poll_common(struct napi_struct *napi, int budget)
847{
848 struct vnet_port *port = container_of(napi, struct vnet_port, napi);
849 struct vio_driver_state *vio = &port->vio;
850 int processed = vnet_event_napi(port, budget);
851
852 if (processed < budget) {
853 napi_complete(napi);
854 port->rx_event &= ~LDC_EVENT_DATA_READY;
855 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
856 }
857 return processed;
858}
859EXPORT_SYMBOL_GPL(sunvnet_poll_common);
860
861void sunvnet_event_common(void *arg, int event)
862{
863 struct vnet_port *port = arg;
864 struct vio_driver_state *vio = &port->vio;
865
866 port->rx_event |= event;
867 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
868 napi_schedule(&port->napi);
869}
870EXPORT_SYMBOL_GPL(sunvnet_event_common);
871
872static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
873{
874 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
875 struct vio_dring_data hdr = {
876 .tag = {
877 .type = VIO_TYPE_DATA,
878 .stype = VIO_SUBTYPE_INFO,
879 .stype_env = VIO_DRING_DATA,
880 .sid = vio_send_sid(&port->vio),
881 },
882 .dring_ident = dr->ident,
883 .start_idx = start,
884 .end_idx = (u32)-1,
885 };
886 int err, delay;
887 int retries = 0;
888
889 if (port->stop_rx) {
890 trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
891 port->vio._peer_sid,
892 port->stop_rx_idx, -1);
893 err = vnet_send_ack(port,
894 &port->vio.drings[VIO_DRIVER_RX_RING],
895 port->stop_rx_idx, -1,
896 VIO_DRING_STOPPED);
897 if (err <= 0)
898 return err;
899 }
900
901 hdr.seq = dr->snd_nxt;
902 delay = 1;
903 do {
904 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
905 if (err > 0) {
906 dr->snd_nxt++;
907 break;
908 }
909 udelay(delay);
910 if ((delay <<= 1) > 128)
911 delay = 128;
912 if (retries++ > VNET_MAX_RETRIES)
913 break;
914 } while (err == -EAGAIN);
915 trace_vnet_tx_trigger(port->vio._local_sid,
916 port->vio._peer_sid, start, err);
917
918 return err;
919}
920
921static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
922 unsigned *pending)
923{
924 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
925 struct sk_buff *skb = NULL;
926 int i, txi;
927
928 *pending = 0;
929
930 txi = dr->prod;
931 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
932 struct vio_net_desc *d;
933
934 --txi;
935 if (txi < 0)
936 txi = VNET_TX_RING_SIZE - 1;
937
938 d = vio_dring_entry(dr, txi);
939
940 if (d->hdr.state == VIO_DESC_READY) {
941 (*pending)++;
942 continue;
943 }
944 if (port->tx_bufs[txi].skb) {
945 if (d->hdr.state != VIO_DESC_DONE)
946 pr_notice("invalid ring buffer state %d\n",
947 d->hdr.state);
948 BUG_ON(port->tx_bufs[txi].skb->next);
949
950 port->tx_bufs[txi].skb->next = skb;
951 skb = port->tx_bufs[txi].skb;
952 port->tx_bufs[txi].skb = NULL;
953
954 ldc_unmap(port->vio.lp,
955 port->tx_bufs[txi].cookies,
956 port->tx_bufs[txi].ncookies);
957 } else if (d->hdr.state == VIO_DESC_FREE) {
958 break;
959 }
960 d->hdr.state = VIO_DESC_FREE;
961 }
962 return skb;
963}
964
965static inline void vnet_free_skbs(struct sk_buff *skb)
966{
967 struct sk_buff *next;
968
969 while (skb) {
970 next = skb->next;
971 skb->next = NULL;
972 dev_kfree_skb(skb);
973 skb = next;
974 }
975}
976
977void sunvnet_clean_timer_expire_common(unsigned long port0)
978{
979 struct vnet_port *port = (struct vnet_port *)port0;
980 struct sk_buff *freeskbs;
981 unsigned pending;
982
983 netif_tx_lock(VNET_PORT_TO_NET_DEVICE(port));
984 freeskbs = vnet_clean_tx_ring(port, &pending);
985 netif_tx_unlock(VNET_PORT_TO_NET_DEVICE(port));
986
987 vnet_free_skbs(freeskbs);
988
989 if (pending)
990 (void)mod_timer(&port->clean_timer,
991 jiffies + VNET_CLEAN_TIMEOUT);
992 else
993 del_timer(&port->clean_timer);
994}
995EXPORT_SYMBOL_GPL(sunvnet_clean_timer_expire_common);
996
997static 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
1041static 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) {
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 nskb->queue_mapping = skb->queue_mapping;
1123 dev_kfree_skb(skb);
1124 skb = nskb;
1125 }
1126 return skb;
1127}
1128
1129static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb,
1130 struct vnet_port *(*vnet_tx_port)
1131 (struct sk_buff *, struct net_device *))
1132{
1133 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
1134 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1135 struct sk_buff *segs;
1136 int maclen, datalen;
1137 int status;
1138 int gso_size, gso_type, gso_segs;
1139 int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1140 int proto = IPPROTO_IP;
1141
1142 if (skb->protocol == htons(ETH_P_IP))
1143 proto = ip_hdr(skb)->protocol;
1144 else if (skb->protocol == htons(ETH_P_IPV6))
1145 proto = ipv6_hdr(skb)->nexthdr;
1146
1147 if (proto == IPPROTO_TCP) {
1148 hlen += tcp_hdr(skb)->doff * 4;
1149 } else if (proto == IPPROTO_UDP) {
1150 hlen += sizeof(struct udphdr);
1151 } else {
1152 pr_err("vnet_handle_offloads GSO with unknown transport "
1153 "protocol %d tproto %d\n", skb->protocol, proto);
1154 hlen = 128; /* XXX */
1155 }
1156 datalen = port->tsolen - hlen;
1157
1158 gso_size = skb_shinfo(skb)->gso_size;
1159 gso_type = skb_shinfo(skb)->gso_type;
1160 gso_segs = skb_shinfo(skb)->gso_segs;
1161
1162 if (port->tso && gso_size < datalen)
1163 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1164
1165 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1166 struct netdev_queue *txq;
1167
1168 txq = netdev_get_tx_queue(dev, port->q_index);
1169 netif_tx_stop_queue(txq);
1170 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1171 return NETDEV_TX_BUSY;
1172 netif_tx_wake_queue(txq);
1173 }
1174
1175 maclen = skb_network_header(skb) - skb_mac_header(skb);
1176 skb_pull(skb, maclen);
1177
1178 if (port->tso && gso_size < datalen) {
1179 if (skb_unclone(skb, GFP_ATOMIC))
1180 goto out_dropped;
1181
1182 /* segment to TSO size */
1183 skb_shinfo(skb)->gso_size = datalen;
1184 skb_shinfo(skb)->gso_segs = gso_segs;
1185 }
1186 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1187 if (IS_ERR(segs))
1188 goto out_dropped;
1189
1190 skb_push(skb, maclen);
1191 skb_reset_mac_header(skb);
1192
1193 status = 0;
1194 while (segs) {
1195 struct sk_buff *curr = segs;
1196
1197 segs = segs->next;
1198 curr->next = NULL;
1199 if (port->tso && curr->len > dev->mtu) {
1200 skb_shinfo(curr)->gso_size = gso_size;
1201 skb_shinfo(curr)->gso_type = gso_type;
1202 skb_shinfo(curr)->gso_segs =
1203 DIV_ROUND_UP(curr->len - hlen, gso_size);
1204 } else {
1205 skb_shinfo(curr)->gso_size = 0;
1206 }
1207
1208 skb_push(curr, maclen);
1209 skb_reset_mac_header(curr);
1210 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1211 maclen);
1212 curr->csum_start = skb_transport_header(curr) - curr->head;
1213 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1214 curr->csum_offset = offsetof(struct tcphdr, check);
1215 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1216 curr->csum_offset = offsetof(struct udphdr, check);
1217
1218 if (!(status & NETDEV_TX_MASK))
1219 status = sunvnet_start_xmit_common(curr, dev,
1220 vnet_tx_port);
1221 if (status & NETDEV_TX_MASK)
1222 dev_kfree_skb_any(curr);
1223 }
1224
1225 if (!(status & NETDEV_TX_MASK))
1226 dev_kfree_skb_any(skb);
1227 return status;
1228out_dropped:
1229 dev->stats.tx_dropped++;
1230 dev_kfree_skb_any(skb);
1231 return NETDEV_TX_OK;
1232}
1233
1234int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
1235 struct vnet_port *(*vnet_tx_port)
1236 (struct sk_buff *, struct net_device *))
1237{
1238 struct vnet_port *port = NULL;
1239 struct vio_dring_state *dr;
1240 struct vio_net_desc *d;
1241 unsigned int len;
1242 struct sk_buff *freeskbs = NULL;
1243 int i, err, txi;
1244 unsigned pending = 0;
1245 struct netdev_queue *txq;
1246
1247 rcu_read_lock();
1248 port = vnet_tx_port(skb, dev);
1249 if (unlikely(!port)) {
1250 rcu_read_unlock();
1251 goto out_dropped;
1252 }
1253
1254 if (skb_is_gso(skb) && skb->len > port->tsolen) {
1255 err = vnet_handle_offloads(port, skb, vnet_tx_port);
1256 rcu_read_unlock();
1257 return err;
1258 }
1259
1260 if (!skb_is_gso(skb) && skb->len > port->rmtu) {
1261 unsigned long localmtu = port->rmtu - ETH_HLEN;
1262
1263 if (vio_version_after_eq(&port->vio, 1, 3))
1264 localmtu -= VLAN_HLEN;
1265
1266 if (skb->protocol == htons(ETH_P_IP)) {
1267 struct flowi4 fl4;
1268 struct rtable *rt = NULL;
1269
1270 memset(&fl4, 0, sizeof(fl4));
1271 fl4.flowi4_oif = dev->ifindex;
1272 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
1273 fl4.daddr = ip_hdr(skb)->daddr;
1274 fl4.saddr = ip_hdr(skb)->saddr;
1275
1276 rt = ip_route_output_key(dev_net(dev), &fl4);
1277 rcu_read_unlock();
1278 if (!IS_ERR(rt)) {
1279 skb_dst_set(skb, &rt->dst);
1280 icmp_send(skb, ICMP_DEST_UNREACH,
1281 ICMP_FRAG_NEEDED,
1282 htonl(localmtu));
1283 }
1284 }
1285#if IS_ENABLED(CONFIG_IPV6)
1286 else if (skb->protocol == htons(ETH_P_IPV6))
1287 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1288#endif
1289 goto out_dropped;
1290 }
1291
1292 skb = vnet_skb_shape(skb, 2);
1293
1294 if (unlikely(!skb))
1295 goto out_dropped;
1296
1297 if (skb->ip_summed == CHECKSUM_PARTIAL)
1298 vnet_fullcsum(skb);
1299
1300 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1301 i = skb_get_queue_mapping(skb);
1302 txq = netdev_get_tx_queue(dev, i);
1303 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1304 if (!netif_tx_queue_stopped(txq)) {
1305 netif_tx_stop_queue(txq);
1306
1307 /* This is a hard error, log it. */
1308 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1309 dev->stats.tx_errors++;
1310 }
1311 rcu_read_unlock();
1312 return NETDEV_TX_BUSY;
1313 }
1314
1315 d = vio_dring_cur(dr);
1316
1317 txi = dr->prod;
1318
1319 freeskbs = vnet_clean_tx_ring(port, &pending);
1320
1321 BUG_ON(port->tx_bufs[txi].skb);
1322
1323 len = skb->len;
1324 if (len < ETH_ZLEN)
1325 len = ETH_ZLEN;
1326
1327 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1328 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1329 if (err < 0) {
1330 netdev_info(dev, "tx buffer map error %d\n", err);
1331 goto out_dropped;
1332 }
1333
1334 port->tx_bufs[txi].skb = skb;
1335 skb = NULL;
1336 port->tx_bufs[txi].ncookies = err;
1337
1338 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1339 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1340 * the protocol itself does not require it as long as the peer
1341 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1342 *
1343 * An ACK for every packet in the ring is expensive as the
1344 * sending of LDC messages is slow and affects performance.
1345 */
1346 d->hdr.ack = VIO_ACK_DISABLE;
1347 d->size = len;
1348 d->ncookies = port->tx_bufs[txi].ncookies;
1349 for (i = 0; i < d->ncookies; i++)
1350 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1351 if (vio_version_after_eq(&port->vio, 1, 7)) {
1352 struct vio_net_dext *dext = vio_net_ext(d);
1353
1354 memset(dext, 0, sizeof(*dext));
1355 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1356 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1357 ->gso_size;
1358 dext->flags |= VNET_PKT_IPV4_LSO;
1359 }
1360 if (vio_version_after_eq(&port->vio, 1, 8) &&
1361 !port->switch_port) {
1362 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1363 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1364 }
1365 }
1366
1367 /* This has to be a non-SMP write barrier because we are writing
1368 * to memory which is shared with the peer LDOM.
1369 */
1370 dma_wmb();
1371
1372 d->hdr.state = VIO_DESC_READY;
1373
1374 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1375 * to notify the consumer that some descriptors are READY.
1376 * After that "start" trigger, no additional triggers are needed until
1377 * a DRING_STOPPED is received from the consumer. The dr->cons field
1378 * (set up by vnet_ack()) has the value of the next dring index
1379 * that has not yet been ack-ed. We send a "start" trigger here
1380 * if, and only if, start_cons is true (reset it afterward). Conversely,
1381 * vnet_ack() should check if the dring corresponding to cons
1382 * is marked READY, but start_cons was false.
1383 * If so, vnet_ack() should send out the missed "start" trigger.
1384 *
1385 * Note that the dma_wmb() above makes sure the cookies et al. are
1386 * not globally visible before the VIO_DESC_READY, and that the
1387 * stores are ordered correctly by the compiler. The consumer will
1388 * not proceed until the VIO_DESC_READY is visible assuring that
1389 * the consumer does not observe anything related to descriptors
1390 * out of order. The HV trap from the LDC start trigger is the
1391 * producer to consumer announcement that work is available to the
1392 * consumer
1393 */
1394 if (!port->start_cons) { /* previous trigger suffices */
1395 trace_vnet_skip_tx_trigger(port->vio._local_sid,
1396 port->vio._peer_sid, dr->cons);
1397 goto ldc_start_done;
1398 }
1399
1400 err = __vnet_tx_trigger(port, dr->cons);
1401 if (unlikely(err < 0)) {
1402 netdev_info(dev, "TX trigger error %d\n", err);
1403 d->hdr.state = VIO_DESC_FREE;
1404 skb = port->tx_bufs[txi].skb;
1405 port->tx_bufs[txi].skb = NULL;
1406 dev->stats.tx_carrier_errors++;
1407 goto out_dropped;
1408 }
1409
1410ldc_start_done:
1411 port->start_cons = false;
1412
1413 dev->stats.tx_packets++;
1414 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1415
1416 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1417 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1418 netif_tx_stop_queue(txq);
1419 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1420 netif_tx_wake_queue(txq);
1421 }
1422
1423 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1424 rcu_read_unlock();
1425
1426 vnet_free_skbs(freeskbs);
1427
1428 return NETDEV_TX_OK;
1429
1430out_dropped:
1431 if (pending)
1432 (void)mod_timer(&port->clean_timer,
1433 jiffies + VNET_CLEAN_TIMEOUT);
1434 else if (port)
1435 del_timer(&port->clean_timer);
1436 if (port)
1437 rcu_read_unlock();
1438 if (skb)
1439 dev_kfree_skb(skb);
1440 vnet_free_skbs(freeskbs);
1441 dev->stats.tx_dropped++;
1442 return NETDEV_TX_OK;
1443}
1444EXPORT_SYMBOL_GPL(sunvnet_start_xmit_common);
1445
1446void sunvnet_tx_timeout_common(struct net_device *dev)
1447{
1448 /* XXX Implement me XXX */
1449}
1450EXPORT_SYMBOL_GPL(sunvnet_tx_timeout_common);
1451
1452int sunvnet_open_common(struct net_device *dev)
1453{
1454 netif_carrier_on(dev);
1455 netif_tx_start_all_queues(dev);
1456
1457 return 0;
1458}
1459EXPORT_SYMBOL_GPL(sunvnet_open_common);
1460
1461int sunvnet_close_common(struct net_device *dev)
1462{
1463 netif_tx_stop_all_queues(dev);
1464 netif_carrier_off(dev);
1465
1466 return 0;
1467}
1468EXPORT_SYMBOL_GPL(sunvnet_close_common);
1469
1470static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1471{
1472 struct vnet_mcast_entry *m;
1473
1474 for (m = vp->mcast_list; m; m = m->next) {
1475 if (ether_addr_equal(m->addr, addr))
1476 return m;
1477 }
1478 return NULL;
1479}
1480
1481static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1482{
1483 struct netdev_hw_addr *ha;
1484
1485 netdev_for_each_mc_addr(ha, dev) {
1486 struct vnet_mcast_entry *m;
1487
1488 m = __vnet_mc_find(vp, ha->addr);
1489 if (m) {
1490 m->hit = 1;
1491 continue;
1492 }
1493
1494 if (!m) {
1495 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1496 if (!m)
1497 continue;
1498 memcpy(m->addr, ha->addr, ETH_ALEN);
1499 m->hit = 1;
1500
1501 m->next = vp->mcast_list;
1502 vp->mcast_list = m;
1503 }
1504 }
1505}
1506
1507static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1508{
1509 struct vio_net_mcast_info info;
1510 struct vnet_mcast_entry *m, **pp;
1511 int n_addrs;
1512
1513 memset(&info, 0, sizeof(info));
1514
1515 info.tag.type = VIO_TYPE_CTRL;
1516 info.tag.stype = VIO_SUBTYPE_INFO;
1517 info.tag.stype_env = VNET_MCAST_INFO;
1518 info.tag.sid = vio_send_sid(&port->vio);
1519 info.set = 1;
1520
1521 n_addrs = 0;
1522 for (m = vp->mcast_list; m; m = m->next) {
1523 if (m->sent)
1524 continue;
1525 m->sent = 1;
1526 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1527 m->addr, ETH_ALEN);
1528 if (++n_addrs == VNET_NUM_MCAST) {
1529 info.count = n_addrs;
1530
1531 (void)vio_ldc_send(&port->vio, &info,
1532 sizeof(info));
1533 n_addrs = 0;
1534 }
1535 }
1536 if (n_addrs) {
1537 info.count = n_addrs;
1538 (void)vio_ldc_send(&port->vio, &info, sizeof(info));
1539 }
1540
1541 info.set = 0;
1542
1543 n_addrs = 0;
1544 pp = &vp->mcast_list;
1545 while ((m = *pp) != NULL) {
1546 if (m->hit) {
1547 m->hit = 0;
1548 pp = &m->next;
1549 continue;
1550 }
1551
1552 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1553 m->addr, ETH_ALEN);
1554 if (++n_addrs == VNET_NUM_MCAST) {
1555 info.count = n_addrs;
1556 (void)vio_ldc_send(&port->vio, &info,
1557 sizeof(info));
1558 n_addrs = 0;
1559 }
1560
1561 *pp = m->next;
1562 kfree(m);
1563 }
1564 if (n_addrs) {
1565 info.count = n_addrs;
1566 (void)vio_ldc_send(&port->vio, &info, sizeof(info));
1567 }
1568}
1569
1570void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp)
1571{
1572 struct vnet_port *port;
1573
1574 rcu_read_lock();
1575 list_for_each_entry_rcu(port, &vp->port_list, list) {
1576 if (port->switch_port) {
1577 __update_mc_list(vp, dev);
1578 __send_mc_list(vp, port);
1579 break;
1580 }
1581 }
1582 rcu_read_unlock();
1583}
1584EXPORT_SYMBOL_GPL(sunvnet_set_rx_mode_common);
1585
1586int sunvnet_change_mtu_common(struct net_device *dev, int new_mtu)
1587{
1588 if (new_mtu < 68 || new_mtu > 65535)
1589 return -EINVAL;
1590
1591 dev->mtu = new_mtu;
1592 return 0;
1593}
1594EXPORT_SYMBOL_GPL(sunvnet_change_mtu_common);
1595
1596int sunvnet_set_mac_addr_common(struct net_device *dev, void *p)
1597{
1598 return -EINVAL;
1599}
1600EXPORT_SYMBOL_GPL(sunvnet_set_mac_addr_common);
1601
1602void sunvnet_port_free_tx_bufs_common(struct vnet_port *port)
1603{
1604 struct vio_dring_state *dr;
1605 int i;
1606
1607 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1608
1609 if (!dr->base)
1610 return;
1611
1612 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1613 struct vio_net_desc *d;
1614 void *skb = port->tx_bufs[i].skb;
1615
1616 if (!skb)
1617 continue;
1618
1619 d = vio_dring_entry(dr, i);
1620
1621 ldc_unmap(port->vio.lp,
1622 port->tx_bufs[i].cookies,
1623 port->tx_bufs[i].ncookies);
1624 dev_kfree_skb(skb);
1625 port->tx_bufs[i].skb = NULL;
1626 d->hdr.state = VIO_DESC_FREE;
1627 }
1628 ldc_free_exp_dring(port->vio.lp, dr->base,
1629 (dr->entry_size * dr->num_entries),
1630 dr->cookies, dr->ncookies);
1631 dr->base = NULL;
1632 dr->entry_size = 0;
1633 dr->num_entries = 0;
1634 dr->pending = 0;
1635 dr->ncookies = 0;
1636}
1637EXPORT_SYMBOL_GPL(sunvnet_port_free_tx_bufs_common);
1638
1639static void vnet_port_reset(struct vnet_port *port)
1640{
1641 del_timer(&port->clean_timer);
1642 sunvnet_port_free_tx_bufs_common(port);
1643 port->rmtu = 0;
1644 port->tso = true;
1645 port->tsolen = 0;
1646}
1647
1648static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1649{
1650 struct vio_dring_state *dr;
1651 unsigned long len, elen;
1652 int i, err, ncookies;
1653 void *dring;
1654
1655 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1656
1657 elen = sizeof(struct vio_net_desc) +
1658 sizeof(struct ldc_trans_cookie) * 2;
1659 if (vio_version_after_eq(&port->vio, 1, 7))
1660 elen += sizeof(struct vio_net_dext);
1661 len = VNET_TX_RING_SIZE * elen;
1662
1663 ncookies = VIO_MAX_RING_COOKIES;
1664 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1665 dr->cookies, &ncookies,
1666 (LDC_MAP_SHADOW |
1667 LDC_MAP_DIRECT |
1668 LDC_MAP_RW));
1669 if (IS_ERR(dring)) {
1670 err = PTR_ERR(dring);
1671 goto err_out;
1672 }
1673
1674 dr->base = dring;
1675 dr->entry_size = elen;
1676 dr->num_entries = VNET_TX_RING_SIZE;
1677 dr->prod = 0;
1678 dr->cons = 0;
1679 port->start_cons = true; /* need an initial trigger */
1680 dr->pending = VNET_TX_RING_SIZE;
1681 dr->ncookies = ncookies;
1682
1683 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1684 struct vio_net_desc *d;
1685
1686 d = vio_dring_entry(dr, i);
1687 d->hdr.state = VIO_DESC_FREE;
1688 }
1689 return 0;
1690
1691err_out:
1692 sunvnet_port_free_tx_bufs_common(port);
1693
1694 return err;
1695}
1696
1697#ifdef CONFIG_NET_POLL_CONTROLLER
1698void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp)
1699{
1700 struct vnet_port *port;
1701 unsigned long flags;
1702
1703 spin_lock_irqsave(&vp->lock, flags);
1704 if (!list_empty(&vp->port_list)) {
1705 port = list_entry(vp->port_list.next, struct vnet_port, list);
1706 napi_schedule(&port->napi);
1707 }
1708 spin_unlock_irqrestore(&vp->lock, flags);
1709}
1710EXPORT_SYMBOL_GPL(sunvnet_poll_controller_common);
1711#endif
1712
1713void sunvnet_port_add_txq_common(struct vnet_port *port)
1714{
1715 struct vnet *vp = port->vp;
1716 int n;
1717
1718 n = vp->nports++;
1719 n = n & (VNET_MAX_TXQS - 1);
1720 port->q_index = n;
1721 netif_tx_wake_queue(netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
1722 port->q_index));
1723}
1724EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common);
1725
1726void sunvnet_port_rm_txq_common(struct vnet_port *port)
1727{
1728 port->vp->nports--;
1729 netif_tx_stop_queue(netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
1730 port->q_index));
1731}
1732EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common);