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Linux 4.16.11
[linux/fpc-iii.git] / drivers / net / ethernet / sun / sunvnet_common.c
blobd8f4c3f281505810620a3c2f03a22bb657a8cb2f
1 // SPDX-License-Identifier: GPL-2.0
2 /* sunvnet.c: Sun LDOM Virtual Network Driver.
3 *
4 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
5 * Copyright (C) 2016-2017 Oracle. All rights reserved.
6 */
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 #define CREATE_TRACE_POINTS
21 #include <trace/events/sunvnet.h>
22
23 #if IS_ENABLED(CONFIG_IPV6)
24 #include <linux/icmpv6.h>
25 #endif
26
27 #include <net/ip.h>
28 #include <net/icmp.h>
29 #include <net/route.h>
30
31 #include <asm/vio.h>
32 #include <asm/ldc.h>
33
34 #include "sunvnet_common.h"
35
36 /* Heuristic for the number of times to exponentially backoff and
37 * retry sending an LDC trigger when EAGAIN is encountered
38 */
39 #define VNET_MAX_RETRIES 10
40
41 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
42 MODULE_DESCRIPTION("Sun LDOM virtual network support library");
43 MODULE_LICENSE("GPL");
44 MODULE_VERSION("1.1");
45
46 static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
47
48 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
49 {
50 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
51 }
52
53 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
54 {
55 struct vio_msg_tag *pkt = arg;
56
57 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
58 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
59 pr_err("Resetting connection\n");
60
61 ldc_disconnect(port->vio.lp);
62
63 return -ECONNRESET;
64 }
65
66 static int vnet_port_alloc_tx_ring(struct vnet_port *port);
67
68 int sunvnet_send_attr_common(struct vio_driver_state *vio)
69 {
70 struct vnet_port *port = to_vnet_port(vio);
71 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
72 struct vio_net_attr_info pkt;
73 int framelen = ETH_FRAME_LEN;
74 int i, err;
75
76 err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
77 if (err)
78 return err;
79
80 memset(&pkt, 0, sizeof(pkt));
81 pkt.tag.type = VIO_TYPE_CTRL;
82 pkt.tag.stype = VIO_SUBTYPE_INFO;
83 pkt.tag.stype_env = VIO_ATTR_INFO;
84 pkt.tag.sid = vio_send_sid(vio);
85 if (vio_version_before(vio, 1, 2))
86 pkt.xfer_mode = VIO_DRING_MODE;
87 else
88 pkt.xfer_mode = VIO_NEW_DRING_MODE;
89 pkt.addr_type = VNET_ADDR_ETHERMAC;
90 pkt.ack_freq = 0;
91 for (i = 0; i < 6; i++)
92 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
93 if (vio_version_after(vio, 1, 3)) {
94 if (port->rmtu) {
95 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
96 pkt.mtu = port->rmtu;
97 } else {
98 port->rmtu = VNET_MAXPACKET;
99 pkt.mtu = port->rmtu;
100 }
101 if (vio_version_after_eq(vio, 1, 6))
102 pkt.options = VIO_TX_DRING;
103 } else if (vio_version_before(vio, 1, 3)) {
104 pkt.mtu = framelen;
105 } else { /* v1.3 */
106 pkt.mtu = framelen + VLAN_HLEN;
107 }
108
109 pkt.cflags = 0;
110 if (vio_version_after_eq(vio, 1, 7) && port->tso) {
111 pkt.cflags |= VNET_LSO_IPV4_CAPAB;
112 if (!port->tsolen)
113 port->tsolen = VNET_MAXTSO;
114 pkt.ipv4_lso_maxlen = port->tsolen;
115 }
116
117 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
118
119 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
120 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
121 "cflags[0x%04x] lso_max[%u]\n",
122 pkt.xfer_mode, pkt.addr_type,
123 (unsigned long long)pkt.addr,
124 pkt.ack_freq, pkt.plnk_updt, pkt.options,
125 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
126
127 return vio_ldc_send(vio, &pkt, sizeof(pkt));
128 }
129 EXPORT_SYMBOL_GPL(sunvnet_send_attr_common);
130
131 static int handle_attr_info(struct vio_driver_state *vio,
132 struct vio_net_attr_info *pkt)
133 {
134 struct vnet_port *port = to_vnet_port(vio);
135 u64 localmtu;
136 u8 xfer_mode;
137
138 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
139 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
140 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
141 pkt->xfer_mode, pkt->addr_type,
142 (unsigned long long)pkt->addr,
143 pkt->ack_freq, pkt->plnk_updt, pkt->options,
144 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
145 pkt->ipv4_lso_maxlen);
146
147 pkt->tag.sid = vio_send_sid(vio);
148
149 xfer_mode = pkt->xfer_mode;
150 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
151 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
152 xfer_mode = VIO_NEW_DRING_MODE;
153
154 /* MTU negotiation:
155 * < v1.3 - ETH_FRAME_LEN exactly
156 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
157 * pkt->mtu for ACK
158 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
159 */
160 if (vio_version_before(vio, 1, 3)) {
161 localmtu = ETH_FRAME_LEN;
162 } else if (vio_version_after(vio, 1, 3)) {
163 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
164 localmtu = min(pkt->mtu, localmtu);
165 pkt->mtu = localmtu;
166 } else { /* v1.3 */
167 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
168 }
169 port->rmtu = localmtu;
170
171 /* LSO negotiation */
172 if (vio_version_after_eq(vio, 1, 7))
173 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
174 else
175 port->tso = false;
176 if (port->tso) {
177 if (!port->tsolen)
178 port->tsolen = VNET_MAXTSO;
179 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
180 if (port->tsolen < VNET_MINTSO) {
181 port->tso = false;
182 port->tsolen = 0;
183 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
184 }
185 pkt->ipv4_lso_maxlen = port->tsolen;
186 } else {
187 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
188 pkt->ipv4_lso_maxlen = 0;
189 port->tsolen = 0;
190 }
191
192 /* for version >= 1.6, ACK packet mode we support */
193 if (vio_version_after_eq(vio, 1, 6)) {
194 pkt->xfer_mode = VIO_NEW_DRING_MODE;
195 pkt->options = VIO_TX_DRING;
196 }
197
198 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
199 pkt->addr_type != VNET_ADDR_ETHERMAC ||
200 pkt->mtu != localmtu) {
201 viodbg(HS, "SEND NET ATTR NACK\n");
202
203 pkt->tag.stype = VIO_SUBTYPE_NACK;
204
205 (void)vio_ldc_send(vio, pkt, sizeof(*pkt));
206
207 return -ECONNRESET;
208 }
209
210 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
211 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
212 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
213 pkt->xfer_mode, pkt->addr_type,
214 (unsigned long long)pkt->addr,
215 pkt->ack_freq, pkt->plnk_updt, pkt->options,
216 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
217 pkt->ipv4_lso_maxlen);
218
219 pkt->tag.stype = VIO_SUBTYPE_ACK;
220
221 return vio_ldc_send(vio, pkt, sizeof(*pkt));
222 }
223
224 static int handle_attr_ack(struct vio_driver_state *vio,
225 struct vio_net_attr_info *pkt)
226 {
227 viodbg(HS, "GOT NET ATTR ACK\n");
228
229 return 0;
230 }
231
232 static int handle_attr_nack(struct vio_driver_state *vio,
233 struct vio_net_attr_info *pkt)
234 {
235 viodbg(HS, "GOT NET ATTR NACK\n");
236
237 return -ECONNRESET;
238 }
239
240 int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg)
241 {
242 struct vio_net_attr_info *pkt = arg;
243
244 switch (pkt->tag.stype) {
245 case VIO_SUBTYPE_INFO:
246 return handle_attr_info(vio, pkt);
247
248 case VIO_SUBTYPE_ACK:
249 return handle_attr_ack(vio, pkt);
250
251 case VIO_SUBTYPE_NACK:
252 return handle_attr_nack(vio, pkt);
253
254 default:
255 return -ECONNRESET;
256 }
257 }
258 EXPORT_SYMBOL_GPL(sunvnet_handle_attr_common);
259
260 void sunvnet_handshake_complete_common(struct vio_driver_state *vio)
261 {
262 struct vio_dring_state *dr;
263
264 dr = &vio->drings[VIO_DRIVER_RX_RING];
265 dr->rcv_nxt = 1;
266 dr->snd_nxt = 1;
267
268 dr = &vio->drings[VIO_DRIVER_TX_RING];
269 dr->rcv_nxt = 1;
270 dr->snd_nxt = 1;
271 }
272 EXPORT_SYMBOL_GPL(sunvnet_handshake_complete_common);
273
274 /* The hypervisor interface that implements copying to/from imported
275 * memory from another domain requires that copies are done to 8-byte
276 * aligned buffers, and that the lengths of such copies are also 8-byte
277 * multiples.
278 *
279 * So we align skb->data to an 8-byte multiple and pad-out the data
280 * area so we can round the copy length up to the next multiple of
281 * 8 for the copy.
282 *
283 * The transmitter puts the actual start of the packet 6 bytes into
284 * the buffer it sends over, so that the IP headers after the ethernet
285 * header are aligned properly. These 6 bytes are not in the descriptor
286 * length, they are simply implied. This offset is represented using
287 * the VNET_PACKET_SKIP macro.
288 */
289 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
290 unsigned int len)
291 {
292 struct sk_buff *skb;
293 unsigned long addr, off;
294
295 skb = netdev_alloc_skb(dev, len + VNET_PACKET_SKIP + 8 + 8);
296 if (unlikely(!skb))
297 return NULL;
298
299 addr = (unsigned long)skb->data;
300 off = ((addr + 7UL) & ~7UL) - addr;
301 if (off)
302 skb_reserve(skb, off);
303
304 return skb;
305 }
306
307 static inline void vnet_fullcsum_ipv4(struct sk_buff *skb)
308 {
309 struct iphdr *iph = ip_hdr(skb);
310 int offset = skb_transport_offset(skb);
311
312 if (skb->protocol != htons(ETH_P_IP))
313 return;
314 if (iph->protocol != IPPROTO_TCP &&
315 iph->protocol != IPPROTO_UDP)
316 return;
317 skb->ip_summed = CHECKSUM_NONE;
318 skb->csum_level = 1;
319 skb->csum = 0;
320 if (iph->protocol == IPPROTO_TCP) {
321 struct tcphdr *ptcp = tcp_hdr(skb);
322
323 ptcp->check = 0;
324 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
325 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
326 skb->len - offset, IPPROTO_TCP,
327 skb->csum);
328 } else if (iph->protocol == IPPROTO_UDP) {
329 struct udphdr *pudp = udp_hdr(skb);
330
331 pudp->check = 0;
332 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
333 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
334 skb->len - offset, IPPROTO_UDP,
335 skb->csum);
336 }
337 }
338
339 #if IS_ENABLED(CONFIG_IPV6)
340 static inline void vnet_fullcsum_ipv6(struct sk_buff *skb)
341 {
342 struct ipv6hdr *ip6h = ipv6_hdr(skb);
343 int offset = skb_transport_offset(skb);
344
345 if (skb->protocol != htons(ETH_P_IPV6))
346 return;
347 if (ip6h->nexthdr != IPPROTO_TCP &&
348 ip6h->nexthdr != IPPROTO_UDP)
349 return;
350 skb->ip_summed = CHECKSUM_NONE;
351 skb->csum_level = 1;
352 skb->csum = 0;
353 if (ip6h->nexthdr == IPPROTO_TCP) {
354 struct tcphdr *ptcp = tcp_hdr(skb);
355
356 ptcp->check = 0;
357 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
358 ptcp->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
359 skb->len - offset, IPPROTO_TCP,
360 skb->csum);
361 } else if (ip6h->nexthdr == IPPROTO_UDP) {
362 struct udphdr *pudp = udp_hdr(skb);
363
364 pudp->check = 0;
365 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
366 pudp->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
367 skb->len - offset, IPPROTO_UDP,
368 skb->csum);
369 }
370 }
371 #endif
372
373 static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
374 {
375 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
376 unsigned int len = desc->size;
377 unsigned int copy_len;
378 struct sk_buff *skb;
379 int maxlen;
380 int err;
381
382 err = -EMSGSIZE;
383 if (port->tso && port->tsolen > port->rmtu)
384 maxlen = port->tsolen;
385 else
386 maxlen = port->rmtu;
387 if (unlikely(len < ETH_ZLEN || len > maxlen)) {
388 dev->stats.rx_length_errors++;
389 goto out_dropped;
390 }
391
392 skb = alloc_and_align_skb(dev, len);
393 err = -ENOMEM;
394 if (unlikely(!skb)) {
395 dev->stats.rx_missed_errors++;
396 goto out_dropped;
397 }
398
399 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
400 skb_put(skb, copy_len);
401 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
402 skb->data, copy_len, 0,
403 desc->cookies, desc->ncookies);
404 if (unlikely(err < 0)) {
405 dev->stats.rx_frame_errors++;
406 goto out_free_skb;
407 }
408
409 skb_pull(skb, VNET_PACKET_SKIP);
410 skb_trim(skb, len);
411 skb->protocol = eth_type_trans(skb, dev);
412
413 if (vio_version_after_eq(&port->vio, 1, 8)) {
414 struct vio_net_dext *dext = vio_net_ext(desc);
415
416 skb_reset_network_header(skb);
417
418 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
419 if (skb->protocol == ETH_P_IP) {
420 struct iphdr *iph = ip_hdr(skb);
421
422 iph->check = 0;
423 ip_send_check(iph);
424 }
425 }
426 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
427 skb->ip_summed == CHECKSUM_NONE) {
428 if (skb->protocol == htons(ETH_P_IP)) {
429 struct iphdr *iph = ip_hdr(skb);
430 int ihl = iph->ihl * 4;
431
432 skb_set_transport_header(skb, ihl);
433 vnet_fullcsum_ipv4(skb);
434 #if IS_ENABLED(CONFIG_IPV6)
435 } else if (skb->protocol == htons(ETH_P_IPV6)) {
436 skb_set_transport_header(skb,
437 sizeof(struct ipv6hdr));
438 vnet_fullcsum_ipv6(skb);
439 #endif
440 }
441 }
442 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
443 skb->ip_summed = CHECKSUM_PARTIAL;
444 skb->csum_level = 0;
445 if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
446 skb->csum_level = 1;
447 }
448 }
449
450 skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
451
452 if (unlikely(is_multicast_ether_addr(eth_hdr(skb)->h_dest)))
453 dev->stats.multicast++;
454 dev->stats.rx_packets++;
455 dev->stats.rx_bytes += len;
456 port->stats.rx_packets++;
457 port->stats.rx_bytes += len;
458 napi_gro_receive(&port->napi, skb);
459 return 0;
460
461 out_free_skb:
462 kfree_skb(skb);
463
464 out_dropped:
465 dev->stats.rx_dropped++;
466 return err;
467 }
468
469 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
470 u32 start, u32 end, u8 vio_dring_state)
471 {
472 struct vio_dring_data hdr = {
473 .tag = {
474 .type = VIO_TYPE_DATA,
475 .stype = VIO_SUBTYPE_ACK,
476 .stype_env = VIO_DRING_DATA,
477 .sid = vio_send_sid(&port->vio),
478 },
479 .dring_ident = dr->ident,
480 .start_idx = start,
481 .end_idx = end,
482 .state = vio_dring_state,
483 };
484 int err, delay;
485 int retries = 0;
486
487 hdr.seq = dr->snd_nxt;
488 delay = 1;
489 do {
490 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
491 if (err > 0) {
492 dr->snd_nxt++;
493 break;
494 }
495 udelay(delay);
496 if ((delay <<= 1) > 128)
497 delay = 128;
498 if (retries++ > VNET_MAX_RETRIES) {
499 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
500 port->raddr[0], port->raddr[1],
501 port->raddr[2], port->raddr[3],
502 port->raddr[4], port->raddr[5]);
503 break;
504 }
505 } while (err == -EAGAIN);
506
507 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
508 port->stop_rx_idx = end;
509 port->stop_rx = true;
510 } else {
511 port->stop_rx_idx = 0;
512 port->stop_rx = false;
513 }
514
515 return err;
516 }
517
518 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
519 struct vio_dring_state *dr,
520 u32 index)
521 {
522 struct vio_net_desc *desc = port->vio.desc_buf;
523 int err;
524
525 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
526 (index * dr->entry_size),
527 dr->cookies, dr->ncookies);
528 if (err < 0)
529 return ERR_PTR(err);
530
531 return desc;
532 }
533
534 static int put_rx_desc(struct vnet_port *port,
535 struct vio_dring_state *dr,
536 struct vio_net_desc *desc,
537 u32 index)
538 {
539 int err;
540
541 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
542 (index * dr->entry_size),
543 dr->cookies, dr->ncookies);
544 if (err < 0)
545 return err;
546
547 return 0;
548 }
549
550 static int vnet_walk_rx_one(struct vnet_port *port,
551 struct vio_dring_state *dr,
552 u32 index, int *needs_ack)
553 {
554 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
555 struct vio_driver_state *vio = &port->vio;
556 int err;
557
558 BUG_ON(!desc);
559 if (IS_ERR(desc))
560 return PTR_ERR(desc);
561
562 if (desc->hdr.state != VIO_DESC_READY)
563 return 1;
564
565 dma_rmb();
566
567 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
568 desc->hdr.state, desc->hdr.ack,
569 desc->size, desc->ncookies,
570 desc->cookies[0].cookie_addr,
571 desc->cookies[0].cookie_size);
572
573 err = vnet_rx_one(port, desc);
574 if (err == -ECONNRESET)
575 return err;
576 trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
577 index, desc->hdr.ack);
578 desc->hdr.state = VIO_DESC_DONE;
579 err = put_rx_desc(port, dr, desc, index);
580 if (err < 0)
581 return err;
582 *needs_ack = desc->hdr.ack;
583 return 0;
584 }
585
586 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
587 u32 start, u32 end, int *npkts, int budget)
588 {
589 struct vio_driver_state *vio = &port->vio;
590 int ack_start = -1, ack_end = -1;
591 bool send_ack = true;
592
593 end = (end == (u32)-1) ? vio_dring_prev(dr, start)
594 : vio_dring_next(dr, end);
595
596 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
597
598 while (start != end) {
599 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
600
601 if (err == -ECONNRESET)
602 return err;
603 if (err != 0)
604 break;
605 (*npkts)++;
606 if (ack_start == -1)
607 ack_start = start;
608 ack_end = start;
609 start = vio_dring_next(dr, start);
610 if (ack && start != end) {
611 err = vnet_send_ack(port, dr, ack_start, ack_end,
612 VIO_DRING_ACTIVE);
613 if (err == -ECONNRESET)
614 return err;
615 ack_start = -1;
616 }
617 if ((*npkts) >= budget) {
618 send_ack = false;
619 break;
620 }
621 }
622 if (unlikely(ack_start == -1)) {
623 ack_end = vio_dring_prev(dr, start);
624 ack_start = ack_end;
625 }
626 if (send_ack) {
627 port->napi_resume = false;
628 trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
629 port->vio._peer_sid,
630 ack_end, *npkts);
631 return vnet_send_ack(port, dr, ack_start, ack_end,
632 VIO_DRING_STOPPED);
633 } else {
634 trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
635 port->vio._peer_sid,
636 ack_end, *npkts);
637 port->napi_resume = true;
638 port->napi_stop_idx = ack_end;
639 return 1;
640 }
641 }
642
643 static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
644 int budget)
645 {
646 struct vio_dring_data *pkt = msgbuf;
647 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
648 struct vio_driver_state *vio = &port->vio;
649
650 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
651 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
652
653 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
654 return 0;
655 if (unlikely(pkt->seq != dr->rcv_nxt)) {
656 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
657 pkt->seq, dr->rcv_nxt);
658 return 0;
659 }
660
661 if (!port->napi_resume)
662 dr->rcv_nxt++;
663
664 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
665
666 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
667 npkts, budget);
668 }
669
670 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
671 {
672 u32 idx = dr->cons;
673 int found = 0;
674
675 while (idx != dr->prod) {
676 if (idx == end) {
677 found = 1;
678 break;
679 }
680 idx = vio_dring_next(dr, idx);
681 }
682 return found;
683 }
684
685 static int vnet_ack(struct vnet_port *port, void *msgbuf)
686 {
687 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
688 struct vio_dring_data *pkt = msgbuf;
689 struct net_device *dev;
690 u32 end;
691 struct vio_net_desc *desc;
692 struct netdev_queue *txq;
693
694 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
695 return 0;
696
697 end = pkt->end_idx;
698 dev = VNET_PORT_TO_NET_DEVICE(port);
699 netif_tx_lock(dev);
700 if (unlikely(!idx_is_pending(dr, end))) {
701 netif_tx_unlock(dev);
702 return 0;
703 }
704
705 /* sync for race conditions with vnet_start_xmit() and tell xmit it
706 * is time to send a trigger.
707 */
708 trace_vnet_rx_stopped_ack(port->vio._local_sid,
709 port->vio._peer_sid, end);
710 dr->cons = vio_dring_next(dr, end);
711 desc = vio_dring_entry(dr, dr->cons);
712 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
713 /* vnet_start_xmit() just populated this dring but missed
714 * sending the "start" LDC message to the consumer.
715 * Send a "start" trigger on its behalf.
716 */
717 if (__vnet_tx_trigger(port, dr->cons) > 0)
718 port->start_cons = false;
719 else
720 port->start_cons = true;
721 } else {
722 port->start_cons = true;
723 }
724 netif_tx_unlock(dev);
725
726 txq = netdev_get_tx_queue(dev, port->q_index);
727 if (unlikely(netif_tx_queue_stopped(txq) &&
728 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
729 return 1;
730
731 return 0;
732 }
733
734 static int vnet_nack(struct vnet_port *port, void *msgbuf)
735 {
736 /* XXX just reset or similar XXX */
737 return 0;
738 }
739
740 static int handle_mcast(struct vnet_port *port, void *msgbuf)
741 {
742 struct vio_net_mcast_info *pkt = msgbuf;
743 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
744
745 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
746 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
747 dev->name,
748 pkt->tag.type,
749 pkt->tag.stype,
750 pkt->tag.stype_env,
751 pkt->tag.sid);
752
753 return 0;
754 }
755
756 /* If the queue is stopped, wake it up so that we'll
757 * send out another START message at the next TX.
758 */
759 static void maybe_tx_wakeup(struct vnet_port *port)
760 {
761 struct netdev_queue *txq;
762
763 txq = netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
764 port->q_index);
765 __netif_tx_lock(txq, smp_processor_id());
766 if (likely(netif_tx_queue_stopped(txq)))
767 netif_tx_wake_queue(txq);
768 __netif_tx_unlock(txq);
769 }
770
771 bool sunvnet_port_is_up_common(struct vnet_port *vnet)
772 {
773 struct vio_driver_state *vio = &vnet->vio;
774
775 return !!(vio->hs_state & VIO_HS_COMPLETE);
776 }
777 EXPORT_SYMBOL_GPL(sunvnet_port_is_up_common);
778
779 static int vnet_event_napi(struct vnet_port *port, int budget)
780 {
781 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
782 struct vio_driver_state *vio = &port->vio;
783 int tx_wakeup, err;
784 int npkts = 0;
785
786 /* we don't expect any other bits */
787 BUG_ON(port->rx_event & ~(LDC_EVENT_DATA_READY |
788 LDC_EVENT_RESET |
789 LDC_EVENT_UP));
790
791 /* RESET takes precedent over any other event */
792 if (port->rx_event & LDC_EVENT_RESET) {
793 /* a link went down */
794
795 if (port->vsw == 1) {
796 netif_tx_stop_all_queues(dev);
797 netif_carrier_off(dev);
798 }
799
800 vio_link_state_change(vio, LDC_EVENT_RESET);
801 vnet_port_reset(port);
802 vio_port_up(vio);
803
804 /* If the device is running but its tx queue was
805 * stopped (due to flow control), restart it.
806 * This is necessary since vnet_port_reset()
807 * clears the tx drings and thus we may never get
808 * back a VIO_TYPE_DATA ACK packet - which is
809 * the normal mechanism to restart the tx queue.
810 */
811 if (netif_running(dev))
812 maybe_tx_wakeup(port);
813
814 port->rx_event = 0;
815 port->stats.event_reset++;
816 return 0;
817 }
818
819 if (port->rx_event & LDC_EVENT_UP) {
820 /* a link came up */
821
822 if (port->vsw == 1) {
823 netif_carrier_on(port->dev);
824 netif_tx_start_all_queues(port->dev);
825 }
826
827 vio_link_state_change(vio, LDC_EVENT_UP);
828 port->rx_event = 0;
829 port->stats.event_up++;
830 return 0;
831 }
832
833 err = 0;
834 tx_wakeup = 0;
835 while (1) {
836 union {
837 struct vio_msg_tag tag;
838 u64 raw[8];
839 } msgbuf;
840
841 if (port->napi_resume) {
842 struct vio_dring_data *pkt =
843 (struct vio_dring_data *)&msgbuf;
844 struct vio_dring_state *dr =
845 &port->vio.drings[VIO_DRIVER_RX_RING];
846
847 pkt->tag.type = VIO_TYPE_DATA;
848 pkt->tag.stype = VIO_SUBTYPE_INFO;
849 pkt->tag.stype_env = VIO_DRING_DATA;
850 pkt->seq = dr->rcv_nxt;
851 pkt->start_idx = vio_dring_next(dr,
852 port->napi_stop_idx);
853 pkt->end_idx = -1;
854 } else {
855 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
856 if (unlikely(err < 0)) {
857 if (err == -ECONNRESET)
858 vio_conn_reset(vio);
859 break;
860 }
861 if (err == 0)
862 break;
863 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
864 msgbuf.tag.type,
865 msgbuf.tag.stype,
866 msgbuf.tag.stype_env,
867 msgbuf.tag.sid);
868 err = vio_validate_sid(vio, &msgbuf.tag);
869 if (err < 0)
870 break;
871 }
872
873 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
874 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
875 if (!sunvnet_port_is_up_common(port)) {
876 /* failures like handshake_failure()
877 * may have cleaned up dring, but
878 * NAPI polling may bring us here.
879 */
880 err = -ECONNRESET;
881 break;
882 }
883 err = vnet_rx(port, &msgbuf, &npkts, budget);
884 if (npkts >= budget)
885 break;
886 if (npkts == 0)
887 break;
888 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
889 err = vnet_ack(port, &msgbuf);
890 if (err > 0)
891 tx_wakeup |= err;
892 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
893 err = vnet_nack(port, &msgbuf);
894 }
895 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
896 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
897 err = handle_mcast(port, &msgbuf);
898 else
899 err = vio_control_pkt_engine(vio, &msgbuf);
900 if (err)
901 break;
902 } else {
903 err = vnet_handle_unknown(port, &msgbuf);
904 }
905 if (err == -ECONNRESET)
906 break;
907 }
908 if (unlikely(tx_wakeup && err != -ECONNRESET))
909 maybe_tx_wakeup(port);
910 return npkts;
911 }
912
913 int sunvnet_poll_common(struct napi_struct *napi, int budget)
914 {
915 struct vnet_port *port = container_of(napi, struct vnet_port, napi);
916 struct vio_driver_state *vio = &port->vio;
917 int processed = vnet_event_napi(port, budget);
918
919 if (processed < budget) {
920 napi_complete_done(napi, processed);
921 port->rx_event &= ~LDC_EVENT_DATA_READY;
922 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
923 }
924 return processed;
925 }
926 EXPORT_SYMBOL_GPL(sunvnet_poll_common);
927
928 void sunvnet_event_common(void *arg, int event)
929 {
930 struct vnet_port *port = arg;
931 struct vio_driver_state *vio = &port->vio;
932
933 port->rx_event |= event;
934 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
935 napi_schedule(&port->napi);
936 }
937 EXPORT_SYMBOL_GPL(sunvnet_event_common);
938
939 static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
940 {
941 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
942 struct vio_dring_data hdr = {
943 .tag = {
944 .type = VIO_TYPE_DATA,
945 .stype = VIO_SUBTYPE_INFO,
946 .stype_env = VIO_DRING_DATA,
947 .sid = vio_send_sid(&port->vio),
948 },
949 .dring_ident = dr->ident,
950 .start_idx = start,
951 .end_idx = (u32)-1,
952 };
953 int err, delay;
954 int retries = 0;
955
956 if (port->stop_rx) {
957 trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
958 port->vio._peer_sid,
959 port->stop_rx_idx, -1);
960 err = vnet_send_ack(port,
961 &port->vio.drings[VIO_DRIVER_RX_RING],
962 port->stop_rx_idx, -1,
963 VIO_DRING_STOPPED);
964 if (err <= 0)
965 return err;
966 }
967
968 hdr.seq = dr->snd_nxt;
969 delay = 1;
970 do {
971 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
972 if (err > 0) {
973 dr->snd_nxt++;
974 break;
975 }
976 udelay(delay);
977 if ((delay <<= 1) > 128)
978 delay = 128;
979 if (retries++ > VNET_MAX_RETRIES)
980 break;
981 } while (err == -EAGAIN);
982 trace_vnet_tx_trigger(port->vio._local_sid,
983 port->vio._peer_sid, start, err);
984
985 return err;
986 }
987
988 static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
989 unsigned *pending)
990 {
991 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
992 struct sk_buff *skb = NULL;
993 int i, txi;
994
995 *pending = 0;
996
997 txi = dr->prod;
998 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
999 struct vio_net_desc *d;
1000
1001 --txi;
1002 if (txi < 0)
1003 txi = VNET_TX_RING_SIZE - 1;
1004
1005 d = vio_dring_entry(dr, txi);
1006
1007 if (d->hdr.state == VIO_DESC_READY) {
1008 (*pending)++;
1009 continue;
1010 }
1011 if (port->tx_bufs[txi].skb) {
1012 if (d->hdr.state != VIO_DESC_DONE)
1013 pr_notice("invalid ring buffer state %d\n",
1014 d->hdr.state);
1015 BUG_ON(port->tx_bufs[txi].skb->next);
1016
1017 port->tx_bufs[txi].skb->next = skb;
1018 skb = port->tx_bufs[txi].skb;
1019 port->tx_bufs[txi].skb = NULL;
1020
1021 ldc_unmap(port->vio.lp,
1022 port->tx_bufs[txi].cookies,
1023 port->tx_bufs[txi].ncookies);
1024 } else if (d->hdr.state == VIO_DESC_FREE) {
1025 break;
1026 }
1027 d->hdr.state = VIO_DESC_FREE;
1028 }
1029 return skb;
1030 }
1031
1032 static inline void vnet_free_skbs(struct sk_buff *skb)
1033 {
1034 struct sk_buff *next;
1035
1036 while (skb) {
1037 next = skb->next;
1038 skb->next = NULL;
1039 dev_kfree_skb(skb);
1040 skb = next;
1041 }
1042 }
1043
1044 void sunvnet_clean_timer_expire_common(struct timer_list *t)
1045 {
1046 struct vnet_port *port = from_timer(port, t, clean_timer);
1047 struct sk_buff *freeskbs;
1048 unsigned pending;
1049
1050 netif_tx_lock(VNET_PORT_TO_NET_DEVICE(port));
1051 freeskbs = vnet_clean_tx_ring(port, &pending);
1052 netif_tx_unlock(VNET_PORT_TO_NET_DEVICE(port));
1053
1054 vnet_free_skbs(freeskbs);
1055
1056 if (pending)
1057 (void)mod_timer(&port->clean_timer,
1058 jiffies + VNET_CLEAN_TIMEOUT);
1059 else
1060 del_timer(&port->clean_timer);
1061 }
1062 EXPORT_SYMBOL_GPL(sunvnet_clean_timer_expire_common);
1063
1064 static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
1065 struct ldc_trans_cookie *cookies, int ncookies,
1066 unsigned int map_perm)
1067 {
1068 int i, nc, err, blen;
1069
1070 /* header */
1071 blen = skb_headlen(skb);
1072 if (blen < ETH_ZLEN)
1073 blen = ETH_ZLEN;
1074 blen += VNET_PACKET_SKIP;
1075 blen += 8 - (blen & 7);
1076
1077 err = ldc_map_single(lp, skb->data - VNET_PACKET_SKIP, blen, cookies,
1078 ncookies, map_perm);
1079 if (err < 0)
1080 return err;
1081 nc = err;
1082
1083 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1084 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1085 u8 *vaddr;
1086
1087 if (nc < ncookies) {
1088 vaddr = kmap_atomic(skb_frag_page(f));
1089 blen = skb_frag_size(f);
1090 blen += 8 - (blen & 7);
1091 err = ldc_map_single(lp, vaddr + f->page_offset,
1092 blen, cookies + nc, ncookies - nc,
1093 map_perm);
1094 kunmap_atomic(vaddr);
1095 } else {
1096 err = -EMSGSIZE;
1097 }
1098
1099 if (err < 0) {
1100 ldc_unmap(lp, cookies, nc);
1101 return err;
1102 }
1103 nc += err;
1104 }
1105 return nc;
1106 }
1107
1108 static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
1109 {
1110 struct sk_buff *nskb;
1111 int i, len, pad, docopy;
1112
1113 len = skb->len;
1114 pad = 0;
1115 if (len < ETH_ZLEN) {
1116 pad += ETH_ZLEN - skb->len;
1117 len += pad;
1118 }
1119 len += VNET_PACKET_SKIP;
1120 pad += 8 - (len & 7);
1121
1122 /* make sure we have enough cookies and alignment in every frag */
1123 docopy = skb_shinfo(skb)->nr_frags >= ncookies;
1124 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1125 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1126
1127 docopy |= f->page_offset & 7;
1128 }
1129 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
1130 skb_tailroom(skb) < pad ||
1131 skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
1132 int start = 0, offset;
1133 __wsum csum;
1134
1135 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
1136 nskb = alloc_and_align_skb(skb->dev, len);
1137 if (!nskb) {
1138 dev_kfree_skb(skb);
1139 return NULL;
1140 }
1141 skb_reserve(nskb, VNET_PACKET_SKIP);
1142
1143 nskb->protocol = skb->protocol;
1144 offset = skb_mac_header(skb) - skb->data;
1145 skb_set_mac_header(nskb, offset);
1146 offset = skb_network_header(skb) - skb->data;
1147 skb_set_network_header(nskb, offset);
1148 offset = skb_transport_header(skb) - skb->data;
1149 skb_set_transport_header(nskb, offset);
1150
1151 offset = 0;
1152 nskb->csum_offset = skb->csum_offset;
1153 nskb->ip_summed = skb->ip_summed;
1154
1155 if (skb->ip_summed == CHECKSUM_PARTIAL)
1156 start = skb_checksum_start_offset(skb);
1157 if (start) {
1158 int offset = start + nskb->csum_offset;
1159
1160 /* copy the headers, no csum here */
1161 if (skb_copy_bits(skb, 0, nskb->data, start)) {
1162 dev_kfree_skb(nskb);
1163 dev_kfree_skb(skb);
1164 return NULL;
1165 }
1166
1167 /* copy the rest, with csum calculation */
1168 *(__sum16 *)(skb->data + offset) = 0;
1169 csum = skb_copy_and_csum_bits(skb, start,
1170 nskb->data + start,
1171 skb->len - start, 0);
1172
1173 /* add in the header checksums */
1174 if (skb->protocol == htons(ETH_P_IP)) {
1175 struct iphdr *iph = ip_hdr(nskb);
1176
1177 if (iph->protocol == IPPROTO_TCP ||
1178 iph->protocol == IPPROTO_UDP) {
1179 csum = csum_tcpudp_magic(iph->saddr,
1180 iph->daddr,
1181 skb->len - start,
1182 iph->protocol,
1183 csum);
1184 }
1185 } else if (skb->protocol == htons(ETH_P_IPV6)) {
1186 struct ipv6hdr *ip6h = ipv6_hdr(nskb);
1187
1188 if (ip6h->nexthdr == IPPROTO_TCP ||
1189 ip6h->nexthdr == IPPROTO_UDP) {
1190 csum = csum_ipv6_magic(&ip6h->saddr,
1191 &ip6h->daddr,
1192 skb->len - start,
1193 ip6h->nexthdr,
1194 csum);
1195 }
1196 }
1197
1198 /* save the final result */
1199 *(__sum16 *)(nskb->data + offset) = csum;
1200
1201 nskb->ip_summed = CHECKSUM_NONE;
1202 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
1203 dev_kfree_skb(nskb);
1204 dev_kfree_skb(skb);
1205 return NULL;
1206 }
1207 (void)skb_put(nskb, skb->len);
1208 if (skb_is_gso(skb)) {
1209 skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
1210 skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
1211 }
1212 nskb->queue_mapping = skb->queue_mapping;
1213 dev_kfree_skb(skb);
1214 skb = nskb;
1215 }
1216 return skb;
1217 }
1218
1219 static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb,
1220 struct vnet_port *(*vnet_tx_port)
1221 (struct sk_buff *, struct net_device *))
1222 {
1223 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
1224 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1225 struct sk_buff *segs;
1226 int maclen, datalen;
1227 int status;
1228 int gso_size, gso_type, gso_segs;
1229 int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1230 int proto = IPPROTO_IP;
1231
1232 if (skb->protocol == htons(ETH_P_IP))
1233 proto = ip_hdr(skb)->protocol;
1234 else if (skb->protocol == htons(ETH_P_IPV6))
1235 proto = ipv6_hdr(skb)->nexthdr;
1236
1237 if (proto == IPPROTO_TCP) {
1238 hlen += tcp_hdr(skb)->doff * 4;
1239 } else if (proto == IPPROTO_UDP) {
1240 hlen += sizeof(struct udphdr);
1241 } else {
1242 pr_err("vnet_handle_offloads GSO with unknown transport "
1243 "protocol %d tproto %d\n", skb->protocol, proto);
1244 hlen = 128; /* XXX */
1245 }
1246 datalen = port->tsolen - hlen;
1247
1248 gso_size = skb_shinfo(skb)->gso_size;
1249 gso_type = skb_shinfo(skb)->gso_type;
1250 gso_segs = skb_shinfo(skb)->gso_segs;
1251
1252 if (port->tso && gso_size < datalen)
1253 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1254
1255 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1256 struct netdev_queue *txq;
1257
1258 txq = netdev_get_tx_queue(dev, port->q_index);
1259 netif_tx_stop_queue(txq);
1260 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1261 return NETDEV_TX_BUSY;
1262 netif_tx_wake_queue(txq);
1263 }
1264
1265 maclen = skb_network_header(skb) - skb_mac_header(skb);
1266 skb_pull(skb, maclen);
1267
1268 if (port->tso && gso_size < datalen) {
1269 if (skb_unclone(skb, GFP_ATOMIC))
1270 goto out_dropped;
1271
1272 /* segment to TSO size */
1273 skb_shinfo(skb)->gso_size = datalen;
1274 skb_shinfo(skb)->gso_segs = gso_segs;
1275 }
1276 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1277 if (IS_ERR(segs))
1278 goto out_dropped;
1279
1280 skb_push(skb, maclen);
1281 skb_reset_mac_header(skb);
1282
1283 status = 0;
1284 while (segs) {
1285 struct sk_buff *curr = segs;
1286
1287 segs = segs->next;
1288 curr->next = NULL;
1289 if (port->tso && curr->len > dev->mtu) {
1290 skb_shinfo(curr)->gso_size = gso_size;
1291 skb_shinfo(curr)->gso_type = gso_type;
1292 skb_shinfo(curr)->gso_segs =
1293 DIV_ROUND_UP(curr->len - hlen, gso_size);
1294 } else {
1295 skb_shinfo(curr)->gso_size = 0;
1296 }
1297
1298 skb_push(curr, maclen);
1299 skb_reset_mac_header(curr);
1300 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1301 maclen);
1302 curr->csum_start = skb_transport_header(curr) - curr->head;
1303 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1304 curr->csum_offset = offsetof(struct tcphdr, check);
1305 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1306 curr->csum_offset = offsetof(struct udphdr, check);
1307
1308 if (!(status & NETDEV_TX_MASK))
1309 status = sunvnet_start_xmit_common(curr, dev,
1310 vnet_tx_port);
1311 if (status & NETDEV_TX_MASK)
1312 dev_kfree_skb_any(curr);
1313 }
1314
1315 if (!(status & NETDEV_TX_MASK))
1316 dev_kfree_skb_any(skb);
1317 return status;
1318 out_dropped:
1319 dev->stats.tx_dropped++;
1320 dev_kfree_skb_any(skb);
1321 return NETDEV_TX_OK;
1322 }
1323
1324 int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
1325 struct vnet_port *(*vnet_tx_port)
1326 (struct sk_buff *, struct net_device *))
1327 {
1328 struct vnet_port *port = NULL;
1329 struct vio_dring_state *dr;
1330 struct vio_net_desc *d;
1331 unsigned int len;
1332 struct sk_buff *freeskbs = NULL;
1333 int i, err, txi;
1334 unsigned pending = 0;
1335 struct netdev_queue *txq;
1336
1337 rcu_read_lock();
1338 port = vnet_tx_port(skb, dev);
1339 if (unlikely(!port))
1340 goto out_dropped;
1341
1342 if (skb_is_gso(skb) && skb->len > port->tsolen) {
1343 err = vnet_handle_offloads(port, skb, vnet_tx_port);
1344 rcu_read_unlock();
1345 return err;
1346 }
1347
1348 if (!skb_is_gso(skb) && skb->len > port->rmtu) {
1349 unsigned long localmtu = port->rmtu - ETH_HLEN;
1350
1351 if (vio_version_after_eq(&port->vio, 1, 3))
1352 localmtu -= VLAN_HLEN;
1353
1354 if (skb->protocol == htons(ETH_P_IP)) {
1355 struct flowi4 fl4;
1356 struct rtable *rt = NULL;
1357
1358 memset(&fl4, 0, sizeof(fl4));
1359 fl4.flowi4_oif = dev->ifindex;
1360 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
1361 fl4.daddr = ip_hdr(skb)->daddr;
1362 fl4.saddr = ip_hdr(skb)->saddr;
1363
1364 rt = ip_route_output_key(dev_net(dev), &fl4);
1365 if (!IS_ERR(rt)) {
1366 skb_dst_set(skb, &rt->dst);
1367 icmp_send(skb, ICMP_DEST_UNREACH,
1368 ICMP_FRAG_NEEDED,
1369 htonl(localmtu));
1370 }
1371 }
1372 #if IS_ENABLED(CONFIG_IPV6)
1373 else if (skb->protocol == htons(ETH_P_IPV6))
1374 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1375 #endif
1376 goto out_dropped;
1377 }
1378
1379 skb = vnet_skb_shape(skb, 2);
1380
1381 if (unlikely(!skb))
1382 goto out_dropped;
1383
1384 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1385 if (skb->protocol == htons(ETH_P_IP))
1386 vnet_fullcsum_ipv4(skb);
1387 #if IS_ENABLED(CONFIG_IPV6)
1388 else if (skb->protocol == htons(ETH_P_IPV6))
1389 vnet_fullcsum_ipv6(skb);
1390 #endif
1391 }
1392
1393 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1394 i = skb_get_queue_mapping(skb);
1395 txq = netdev_get_tx_queue(dev, i);
1396 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1397 if (!netif_tx_queue_stopped(txq)) {
1398 netif_tx_stop_queue(txq);
1399
1400 /* This is a hard error, log it. */
1401 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1402 dev->stats.tx_errors++;
1403 }
1404 rcu_read_unlock();
1405 return NETDEV_TX_BUSY;
1406 }
1407
1408 d = vio_dring_cur(dr);
1409
1410 txi = dr->prod;
1411
1412 freeskbs = vnet_clean_tx_ring(port, &pending);
1413
1414 BUG_ON(port->tx_bufs[txi].skb);
1415
1416 len = skb->len;
1417 if (len < ETH_ZLEN)
1418 len = ETH_ZLEN;
1419
1420 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1421 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1422 if (err < 0) {
1423 netdev_info(dev, "tx buffer map error %d\n", err);
1424 goto out_dropped;
1425 }
1426
1427 port->tx_bufs[txi].skb = skb;
1428 skb = NULL;
1429 port->tx_bufs[txi].ncookies = err;
1430
1431 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1432 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1433 * the protocol itself does not require it as long as the peer
1434 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1435 *
1436 * An ACK for every packet in the ring is expensive as the
1437 * sending of LDC messages is slow and affects performance.
1438 */
1439 d->hdr.ack = VIO_ACK_DISABLE;
1440 d->size = len;
1441 d->ncookies = port->tx_bufs[txi].ncookies;
1442 for (i = 0; i < d->ncookies; i++)
1443 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1444 if (vio_version_after_eq(&port->vio, 1, 7)) {
1445 struct vio_net_dext *dext = vio_net_ext(d);
1446
1447 memset(dext, 0, sizeof(*dext));
1448 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1449 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1450 ->gso_size;
1451 dext->flags |= VNET_PKT_IPV4_LSO;
1452 }
1453 if (vio_version_after_eq(&port->vio, 1, 8) &&
1454 !port->switch_port) {
1455 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1456 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1457 }
1458 }
1459
1460 /* This has to be a non-SMP write barrier because we are writing
1461 * to memory which is shared with the peer LDOM.
1462 */
1463 dma_wmb();
1464
1465 d->hdr.state = VIO_DESC_READY;
1466
1467 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1468 * to notify the consumer that some descriptors are READY.
1469 * After that "start" trigger, no additional triggers are needed until
1470 * a DRING_STOPPED is received from the consumer. The dr->cons field
1471 * (set up by vnet_ack()) has the value of the next dring index
1472 * that has not yet been ack-ed. We send a "start" trigger here
1473 * if, and only if, start_cons is true (reset it afterward). Conversely,
1474 * vnet_ack() should check if the dring corresponding to cons
1475 * is marked READY, but start_cons was false.
1476 * If so, vnet_ack() should send out the missed "start" trigger.
1477 *
1478 * Note that the dma_wmb() above makes sure the cookies et al. are
1479 * not globally visible before the VIO_DESC_READY, and that the
1480 * stores are ordered correctly by the compiler. The consumer will
1481 * not proceed until the VIO_DESC_READY is visible assuring that
1482 * the consumer does not observe anything related to descriptors
1483 * out of order. The HV trap from the LDC start trigger is the
1484 * producer to consumer announcement that work is available to the
1485 * consumer
1486 */
1487 if (!port->start_cons) { /* previous trigger suffices */
1488 trace_vnet_skip_tx_trigger(port->vio._local_sid,
1489 port->vio._peer_sid, dr->cons);
1490 goto ldc_start_done;
1491 }
1492
1493 err = __vnet_tx_trigger(port, dr->cons);
1494 if (unlikely(err < 0)) {
1495 netdev_info(dev, "TX trigger error %d\n", err);
1496 d->hdr.state = VIO_DESC_FREE;
1497 skb = port->tx_bufs[txi].skb;
1498 port->tx_bufs[txi].skb = NULL;
1499 dev->stats.tx_carrier_errors++;
1500 goto out_dropped;
1501 }
1502
1503 ldc_start_done:
1504 port->start_cons = false;
1505
1506 dev->stats.tx_packets++;
1507 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1508 port->stats.tx_packets++;
1509 port->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1510
1511 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1512 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1513 netif_tx_stop_queue(txq);
1514 smp_rmb();
1515 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1516 netif_tx_wake_queue(txq);
1517 }
1518
1519 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1520 rcu_read_unlock();
1521
1522 vnet_free_skbs(freeskbs);
1523
1524 return NETDEV_TX_OK;
1525
1526 out_dropped:
1527 if (pending)
1528 (void)mod_timer(&port->clean_timer,
1529 jiffies + VNET_CLEAN_TIMEOUT);
1530 else if (port)
1531 del_timer(&port->clean_timer);
1532 rcu_read_unlock();
1533 if (skb)
1534 dev_kfree_skb(skb);
1535 vnet_free_skbs(freeskbs);
1536 dev->stats.tx_dropped++;
1537 return NETDEV_TX_OK;
1538 }
1539 EXPORT_SYMBOL_GPL(sunvnet_start_xmit_common);
1540
1541 void sunvnet_tx_timeout_common(struct net_device *dev)
1542 {
1543 /* XXX Implement me XXX */
1544 }
1545 EXPORT_SYMBOL_GPL(sunvnet_tx_timeout_common);
1546
1547 int sunvnet_open_common(struct net_device *dev)
1548 {
1549 netif_carrier_on(dev);
1550 netif_tx_start_all_queues(dev);
1551
1552 return 0;
1553 }
1554 EXPORT_SYMBOL_GPL(sunvnet_open_common);
1555
1556 int sunvnet_close_common(struct net_device *dev)
1557 {
1558 netif_tx_stop_all_queues(dev);
1559 netif_carrier_off(dev);
1560
1561 return 0;
1562 }
1563 EXPORT_SYMBOL_GPL(sunvnet_close_common);
1564
1565 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1566 {
1567 struct vnet_mcast_entry *m;
1568
1569 for (m = vp->mcast_list; m; m = m->next) {
1570 if (ether_addr_equal(m->addr, addr))
1571 return m;
1572 }
1573 return NULL;
1574 }
1575
1576 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1577 {
1578 struct netdev_hw_addr *ha;
1579
1580 netdev_for_each_mc_addr(ha, dev) {
1581 struct vnet_mcast_entry *m;
1582
1583 m = __vnet_mc_find(vp, ha->addr);
1584 if (m) {
1585 m->hit = 1;
1586 continue;
1587 }
1588
1589 if (!m) {
1590 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1591 if (!m)
1592 continue;
1593 memcpy(m->addr, ha->addr, ETH_ALEN);
1594 m->hit = 1;
1595
1596 m->next = vp->mcast_list;
1597 vp->mcast_list = m;
1598 }
1599 }
1600 }
1601
1602 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1603 {
1604 struct vio_net_mcast_info info;
1605 struct vnet_mcast_entry *m, **pp;
1606 int n_addrs;
1607
1608 memset(&info, 0, sizeof(info));
1609
1610 info.tag.type = VIO_TYPE_CTRL;
1611 info.tag.stype = VIO_SUBTYPE_INFO;
1612 info.tag.stype_env = VNET_MCAST_INFO;
1613 info.tag.sid = vio_send_sid(&port->vio);
1614 info.set = 1;
1615
1616 n_addrs = 0;
1617 for (m = vp->mcast_list; m; m = m->next) {
1618 if (m->sent)
1619 continue;
1620 m->sent = 1;
1621 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1622 m->addr, ETH_ALEN);
1623 if (++n_addrs == VNET_NUM_MCAST) {
1624 info.count = n_addrs;
1625
1626 (void)vio_ldc_send(&port->vio, &info,
1627 sizeof(info));
1628 n_addrs = 0;
1629 }
1630 }
1631 if (n_addrs) {
1632 info.count = n_addrs;
1633 (void)vio_ldc_send(&port->vio, &info, sizeof(info));
1634 }
1635
1636 info.set = 0;
1637
1638 n_addrs = 0;
1639 pp = &vp->mcast_list;
1640 while ((m = *pp) != NULL) {
1641 if (m->hit) {
1642 m->hit = 0;
1643 pp = &m->next;
1644 continue;
1645 }
1646
1647 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1648 m->addr, ETH_ALEN);
1649 if (++n_addrs == VNET_NUM_MCAST) {
1650 info.count = n_addrs;
1651 (void)vio_ldc_send(&port->vio, &info,
1652 sizeof(info));
1653 n_addrs = 0;
1654 }
1655
1656 *pp = m->next;
1657 kfree(m);
1658 }
1659 if (n_addrs) {
1660 info.count = n_addrs;
1661 (void)vio_ldc_send(&port->vio, &info, sizeof(info));
1662 }
1663 }
1664
1665 void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp)
1666 {
1667 struct vnet_port *port;
1668
1669 rcu_read_lock();
1670 list_for_each_entry_rcu(port, &vp->port_list, list) {
1671 if (port->switch_port) {
1672 __update_mc_list(vp, dev);
1673 __send_mc_list(vp, port);
1674 break;
1675 }
1676 }
1677 rcu_read_unlock();
1678 }
1679 EXPORT_SYMBOL_GPL(sunvnet_set_rx_mode_common);
1680
1681 int sunvnet_set_mac_addr_common(struct net_device *dev, void *p)
1682 {
1683 return -EINVAL;
1684 }
1685 EXPORT_SYMBOL_GPL(sunvnet_set_mac_addr_common);
1686
1687 void sunvnet_port_free_tx_bufs_common(struct vnet_port *port)
1688 {
1689 struct vio_dring_state *dr;
1690 int i;
1691
1692 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1693
1694 if (!dr->base)
1695 return;
1696
1697 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1698 struct vio_net_desc *d;
1699 void *skb = port->tx_bufs[i].skb;
1700
1701 if (!skb)
1702 continue;
1703
1704 d = vio_dring_entry(dr, i);
1705
1706 ldc_unmap(port->vio.lp,
1707 port->tx_bufs[i].cookies,
1708 port->tx_bufs[i].ncookies);
1709 dev_kfree_skb(skb);
1710 port->tx_bufs[i].skb = NULL;
1711 d->hdr.state = VIO_DESC_FREE;
1712 }
1713 ldc_free_exp_dring(port->vio.lp, dr->base,
1714 (dr->entry_size * dr->num_entries),
1715 dr->cookies, dr->ncookies);
1716 dr->base = NULL;
1717 dr->entry_size = 0;
1718 dr->num_entries = 0;
1719 dr->pending = 0;
1720 dr->ncookies = 0;
1721 }
1722 EXPORT_SYMBOL_GPL(sunvnet_port_free_tx_bufs_common);
1723
1724 void vnet_port_reset(struct vnet_port *port)
1725 {
1726 del_timer(&port->clean_timer);
1727 sunvnet_port_free_tx_bufs_common(port);
1728 port->rmtu = 0;
1729 port->tso = (port->vsw == 0); /* no tso in vsw, misbehaves in bridge */
1730 port->tsolen = 0;
1731 }
1732 EXPORT_SYMBOL_GPL(vnet_port_reset);
1733
1734 static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1735 {
1736 struct vio_dring_state *dr;
1737 unsigned long len, elen;
1738 int i, err, ncookies;
1739 void *dring;
1740
1741 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1742
1743 elen = sizeof(struct vio_net_desc) +
1744 sizeof(struct ldc_trans_cookie) * 2;
1745 if (vio_version_after_eq(&port->vio, 1, 7))
1746 elen += sizeof(struct vio_net_dext);
1747 len = VNET_TX_RING_SIZE * elen;
1748
1749 ncookies = VIO_MAX_RING_COOKIES;
1750 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1751 dr->cookies, &ncookies,
1752 (LDC_MAP_SHADOW |
1753 LDC_MAP_DIRECT |
1754 LDC_MAP_RW));
1755 if (IS_ERR(dring)) {
1756 err = PTR_ERR(dring);
1757 goto err_out;
1758 }
1759
1760 dr->base = dring;
1761 dr->entry_size = elen;
1762 dr->num_entries = VNET_TX_RING_SIZE;
1763 dr->prod = 0;
1764 dr->cons = 0;
1765 port->start_cons = true; /* need an initial trigger */
1766 dr->pending = VNET_TX_RING_SIZE;
1767 dr->ncookies = ncookies;
1768
1769 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1770 struct vio_net_desc *d;
1771
1772 d = vio_dring_entry(dr, i);
1773 d->hdr.state = VIO_DESC_FREE;
1774 }
1775 return 0;
1776
1777 err_out:
1778 sunvnet_port_free_tx_bufs_common(port);
1779
1780 return err;
1781 }
1782
1783 #ifdef CONFIG_NET_POLL_CONTROLLER
1784 void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp)
1785 {
1786 struct vnet_port *port;
1787 unsigned long flags;
1788
1789 spin_lock_irqsave(&vp->lock, flags);
1790 if (!list_empty(&vp->port_list)) {
1791 port = list_entry(vp->port_list.next, struct vnet_port, list);
1792 napi_schedule(&port->napi);
1793 }
1794 spin_unlock_irqrestore(&vp->lock, flags);
1795 }
1796 EXPORT_SYMBOL_GPL(sunvnet_poll_controller_common);
1797 #endif
1798
1799 void sunvnet_port_add_txq_common(struct vnet_port *port)
1800 {
1801 struct vnet *vp = port->vp;
1802 int smallest = 0;
1803 int i;
1804
1805 /* find the first least-used q
1806 * When there are more ldoms than q's, we start to
1807 * double up on ports per queue.
1808 */
1809 for (i = 0; i < VNET_MAX_TXQS; i++) {
1810 if (vp->q_used[i] == 0) {
1811 smallest = i;
1812 break;
1813 }
1814 if (vp->q_used[i] < vp->q_used[smallest])
1815 smallest = i;
1816 }
1817
1818 vp->nports++;
1819 vp->q_used[smallest]++;
1820 port->q_index = smallest;
1821 }
1822 EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common);
1823
1824 void sunvnet_port_rm_txq_common(struct vnet_port *port)
1825 {
1826 port->vp->nports--;
1827 port->vp->q_used[port->q_index]--;
1828 port->q_index = 0;
1829 }
1830 EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common);
Linux with added FPC-III support