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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/gso.h>
29#include <net/icmp.h>
30#include <net/route.h>
31
32#include <asm/vio.h>
33#include <asm/ldc.h>
34
35#include "sunvnet_common.h"
36
37/* Heuristic for the number of times to exponentially backoff and
38 * retry sending an LDC trigger when EAGAIN is encountered
39 */
40#define VNET_MAX_RETRIES 10
41
42MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
43MODULE_DESCRIPTION("Sun LDOM virtual network support library");
44MODULE_LICENSE("GPL");
45MODULE_VERSION("1.1");
46
47static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
48
49static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
50{
51 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
52}
53
54static int vnet_handle_unknown(struct vnet_port *port, void *arg)
55{
56 struct vio_msg_tag *pkt = arg;
57
58 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
59 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
60 pr_err("Resetting connection\n");
61
62 ldc_disconnect(port->vio.lp);
63
64 return -ECONNRESET;
65}
66
67static int vnet_port_alloc_tx_ring(struct vnet_port *port);
68
69int sunvnet_send_attr_common(struct vio_driver_state *vio)
70{
71 struct vnet_port *port = to_vnet_port(vio);
72 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
73 struct vio_net_attr_info pkt;
74 int framelen = ETH_FRAME_LEN;
75 int i, err;
76
77 err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
78 if (err)
79 return err;
80
81 memset(&pkt, 0, sizeof(pkt));
82 pkt.tag.type = VIO_TYPE_CTRL;
83 pkt.tag.stype = VIO_SUBTYPE_INFO;
84 pkt.tag.stype_env = VIO_ATTR_INFO;
85 pkt.tag.sid = vio_send_sid(vio);
86 if (vio_version_before(vio, 1, 2))
87 pkt.xfer_mode = VIO_DRING_MODE;
88 else
89 pkt.xfer_mode = VIO_NEW_DRING_MODE;
90 pkt.addr_type = VNET_ADDR_ETHERMAC;
91 pkt.ack_freq = 0;
92 for (i = 0; i < 6; i++)
93 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
94 if (vio_version_after(vio, 1, 3)) {
95 if (port->rmtu) {
96 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
97 pkt.mtu = port->rmtu;
98 } else {
99 port->rmtu = VNET_MAXPACKET;
100 pkt.mtu = port->rmtu;
101 }
102 if (vio_version_after_eq(vio, 1, 6))
103 pkt.options = VIO_TX_DRING;
104 } else if (vio_version_before(vio, 1, 3)) {
105 pkt.mtu = framelen;
106 } else { /* v1.3 */
107 pkt.mtu = framelen + VLAN_HLEN;
108 }
109
110 pkt.cflags = 0;
111 if (vio_version_after_eq(vio, 1, 7) && port->tso) {
112 pkt.cflags |= VNET_LSO_IPV4_CAPAB;
113 if (!port->tsolen)
114 port->tsolen = VNET_MAXTSO;
115 pkt.ipv4_lso_maxlen = port->tsolen;
116 }
117
118 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
119
120 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
121 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
122 "cflags[0x%04x] lso_max[%u]\n",
123 pkt.xfer_mode, pkt.addr_type,
124 (unsigned long long)pkt.addr,
125 pkt.ack_freq, pkt.plnk_updt, pkt.options,
126 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
127
128 return vio_ldc_send(vio, &pkt, sizeof(pkt));
129}
130EXPORT_SYMBOL_GPL(sunvnet_send_attr_common);
131
132static int handle_attr_info(struct vio_driver_state *vio,
133 struct vio_net_attr_info *pkt)
134{
135 struct vnet_port *port = to_vnet_port(vio);
136 u64 localmtu;
137 u8 xfer_mode;
138
139 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
140 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
141 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
142 pkt->xfer_mode, pkt->addr_type,
143 (unsigned long long)pkt->addr,
144 pkt->ack_freq, pkt->plnk_updt, pkt->options,
145 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
146 pkt->ipv4_lso_maxlen);
147
148 pkt->tag.sid = vio_send_sid(vio);
149
150 xfer_mode = pkt->xfer_mode;
151 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
152 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
153 xfer_mode = VIO_NEW_DRING_MODE;
154
155 /* MTU negotiation:
156 * < v1.3 - ETH_FRAME_LEN exactly
157 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
158 * pkt->mtu for ACK
159 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
160 */
161 if (vio_version_before(vio, 1, 3)) {
162 localmtu = ETH_FRAME_LEN;
163 } else if (vio_version_after(vio, 1, 3)) {
164 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
165 localmtu = min(pkt->mtu, localmtu);
166 pkt->mtu = localmtu;
167 } else { /* v1.3 */
168 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
169 }
170 port->rmtu = localmtu;
171
172 /* LSO negotiation */
173 if (vio_version_after_eq(vio, 1, 7))
174 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
175 else
176 port->tso = false;
177 if (port->tso) {
178 if (!port->tsolen)
179 port->tsolen = VNET_MAXTSO;
180 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
181 if (port->tsolen < VNET_MINTSO) {
182 port->tso = false;
183 port->tsolen = 0;
184 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
185 }
186 pkt->ipv4_lso_maxlen = port->tsolen;
187 } else {
188 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
189 pkt->ipv4_lso_maxlen = 0;
190 port->tsolen = 0;
191 }
192
193 /* for version >= 1.6, ACK packet mode we support */
194 if (vio_version_after_eq(vio, 1, 6)) {
195 pkt->xfer_mode = VIO_NEW_DRING_MODE;
196 pkt->options = VIO_TX_DRING;
197 }
198
199 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
200 pkt->addr_type != VNET_ADDR_ETHERMAC ||
201 pkt->mtu != localmtu) {
202 viodbg(HS, "SEND NET ATTR NACK\n");
203
204 pkt->tag.stype = VIO_SUBTYPE_NACK;
205
206 (void)vio_ldc_send(vio, pkt, sizeof(*pkt));
207
208 return -ECONNRESET;
209 }
210
211 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
212 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
213 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
214 pkt->xfer_mode, pkt->addr_type,
215 (unsigned long long)pkt->addr,
216 pkt->ack_freq, pkt->plnk_updt, pkt->options,
217 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
218 pkt->ipv4_lso_maxlen);
219
220 pkt->tag.stype = VIO_SUBTYPE_ACK;
221
222 return vio_ldc_send(vio, pkt, sizeof(*pkt));
223}
224
225static int handle_attr_ack(struct vio_driver_state *vio,
226 struct vio_net_attr_info *pkt)
227{
228 viodbg(HS, "GOT NET ATTR ACK\n");
229
230 return 0;
231}
232
233static int handle_attr_nack(struct vio_driver_state *vio,
234 struct vio_net_attr_info *pkt)
235{
236 viodbg(HS, "GOT NET ATTR NACK\n");
237
238 return -ECONNRESET;
239}
240
241int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg)
242{
243 struct vio_net_attr_info *pkt = arg;
244
245 switch (pkt->tag.stype) {
246 case VIO_SUBTYPE_INFO:
247 return handle_attr_info(vio, pkt);
248
249 case VIO_SUBTYPE_ACK:
250 return handle_attr_ack(vio, pkt);
251
252 case VIO_SUBTYPE_NACK:
253 return handle_attr_nack(vio, pkt);
254
255 default:
256 return -ECONNRESET;
257 }
258}
259EXPORT_SYMBOL_GPL(sunvnet_handle_attr_common);
260
261void sunvnet_handshake_complete_common(struct vio_driver_state *vio)
262{
263 struct vio_dring_state *dr;
264
265 dr = &vio->drings[VIO_DRIVER_RX_RING];
266 dr->rcv_nxt = 1;
267 dr->snd_nxt = 1;
268
269 dr = &vio->drings[VIO_DRIVER_TX_RING];
270 dr->rcv_nxt = 1;
271 dr->snd_nxt = 1;
272}
273EXPORT_SYMBOL_GPL(sunvnet_handshake_complete_common);
274
275/* The hypervisor interface that implements copying to/from imported
276 * memory from another domain requires that copies are done to 8-byte
277 * aligned buffers, and that the lengths of such copies are also 8-byte
278 * multiples.
279 *
280 * So we align skb->data to an 8-byte multiple and pad-out the data
281 * area so we can round the copy length up to the next multiple of
282 * 8 for the copy.
283 *
284 * The transmitter puts the actual start of the packet 6 bytes into
285 * the buffer it sends over, so that the IP headers after the ethernet
286 * header are aligned properly. These 6 bytes are not in the descriptor
287 * length, they are simply implied. This offset is represented using
288 * the VNET_PACKET_SKIP macro.
289 */
290static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
291 unsigned int len)
292{
293 struct sk_buff *skb;
294 unsigned long addr, off;
295
296 skb = netdev_alloc_skb(dev, len + VNET_PACKET_SKIP + 8 + 8);
297 if (unlikely(!skb))
298 return NULL;
299
300 addr = (unsigned long)skb->data;
301 off = ((addr + 7UL) & ~7UL) - addr;
302 if (off)
303 skb_reserve(skb, off);
304
305 return skb;
306}
307
308static inline void vnet_fullcsum_ipv4(struct sk_buff *skb)
309{
310 struct iphdr *iph = ip_hdr(skb);
311 int offset = skb_transport_offset(skb);
312
313 if (skb->protocol != htons(ETH_P_IP))
314 return;
315 if (iph->protocol != IPPROTO_TCP &&
316 iph->protocol != IPPROTO_UDP)
317 return;
318 skb->ip_summed = CHECKSUM_NONE;
319 skb->csum_level = 1;
320 skb->csum = 0;
321 if (iph->protocol == IPPROTO_TCP) {
322 struct tcphdr *ptcp = tcp_hdr(skb);
323
324 ptcp->check = 0;
325 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
326 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
327 skb->len - offset, IPPROTO_TCP,
328 skb->csum);
329 } else if (iph->protocol == IPPROTO_UDP) {
330 struct udphdr *pudp = udp_hdr(skb);
331
332 pudp->check = 0;
333 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
334 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
335 skb->len - offset, IPPROTO_UDP,
336 skb->csum);
337 }
338}
339
340#if IS_ENABLED(CONFIG_IPV6)
341static inline void vnet_fullcsum_ipv6(struct sk_buff *skb)
342{
343 struct ipv6hdr *ip6h = ipv6_hdr(skb);
344 int offset = skb_transport_offset(skb);
345
346 if (skb->protocol != htons(ETH_P_IPV6))
347 return;
348 if (ip6h->nexthdr != IPPROTO_TCP &&
349 ip6h->nexthdr != IPPROTO_UDP)
350 return;
351 skb->ip_summed = CHECKSUM_NONE;
352 skb->csum_level = 1;
353 skb->csum = 0;
354 if (ip6h->nexthdr == IPPROTO_TCP) {
355 struct tcphdr *ptcp = tcp_hdr(skb);
356
357 ptcp->check = 0;
358 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
359 ptcp->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
360 skb->len - offset, IPPROTO_TCP,
361 skb->csum);
362 } else if (ip6h->nexthdr == IPPROTO_UDP) {
363 struct udphdr *pudp = udp_hdr(skb);
364
365 pudp->check = 0;
366 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
367 pudp->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
368 skb->len - offset, IPPROTO_UDP,
369 skb->csum);
370 }
371}
372#endif
373
374static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
375{
376 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
377 unsigned int len = desc->size;
378 unsigned int copy_len;
379 struct sk_buff *skb;
380 int maxlen;
381 int err;
382
383 err = -EMSGSIZE;
384 if (port->tso && port->tsolen > port->rmtu)
385 maxlen = port->tsolen;
386 else
387 maxlen = port->rmtu;
388 if (unlikely(len < ETH_ZLEN || len > maxlen)) {
389 dev->stats.rx_length_errors++;
390 goto out_dropped;
391 }
392
393 skb = alloc_and_align_skb(dev, len);
394 err = -ENOMEM;
395 if (unlikely(!skb)) {
396 dev->stats.rx_missed_errors++;
397 goto out_dropped;
398 }
399
400 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
401 skb_put(skb, copy_len);
402 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
403 skb->data, copy_len, 0,
404 desc->cookies, desc->ncookies);
405 if (unlikely(err < 0)) {
406 dev->stats.rx_frame_errors++;
407 goto out_free_skb;
408 }
409
410 skb_pull(skb, VNET_PACKET_SKIP);
411 skb_trim(skb, len);
412 skb->protocol = eth_type_trans(skb, dev);
413
414 if (vio_version_after_eq(&port->vio, 1, 8)) {
415 struct vio_net_dext *dext = vio_net_ext(desc);
416
417 skb_reset_network_header(skb);
418
419 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
420 if (skb->protocol == ETH_P_IP) {
421 struct iphdr *iph = ip_hdr(skb);
422
423 iph->check = 0;
424 ip_send_check(iph);
425 }
426 }
427 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
428 skb->ip_summed == CHECKSUM_NONE) {
429 if (skb->protocol == htons(ETH_P_IP)) {
430 struct iphdr *iph = ip_hdr(skb);
431 int ihl = iph->ihl * 4;
432
433 skb_set_transport_header(skb, ihl);
434 vnet_fullcsum_ipv4(skb);
435#if IS_ENABLED(CONFIG_IPV6)
436 } else if (skb->protocol == htons(ETH_P_IPV6)) {
437 skb_set_transport_header(skb,
438 sizeof(struct ipv6hdr));
439 vnet_fullcsum_ipv6(skb);
440#endif
441 }
442 }
443 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
444 skb->ip_summed = CHECKSUM_PARTIAL;
445 skb->csum_level = 0;
446 if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
447 skb->csum_level = 1;
448 }
449 }
450
451 skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
452
453 if (unlikely(is_multicast_ether_addr(eth_hdr(skb)->h_dest)))
454 dev->stats.multicast++;
455 dev->stats.rx_packets++;
456 dev->stats.rx_bytes += len;
457 port->stats.rx_packets++;
458 port->stats.rx_bytes += len;
459 napi_gro_receive(&port->napi, skb);
460 return 0;
461
462out_free_skb:
463 kfree_skb(skb);
464
465out_dropped:
466 dev->stats.rx_dropped++;
467 return err;
468}
469
470static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
471 u32 start, u32 end, u8 vio_dring_state)
472{
473 struct vio_dring_data hdr = {
474 .tag = {
475 .type = VIO_TYPE_DATA,
476 .stype = VIO_SUBTYPE_ACK,
477 .stype_env = VIO_DRING_DATA,
478 .sid = vio_send_sid(&port->vio),
479 },
480 .dring_ident = dr->ident,
481 .start_idx = start,
482 .end_idx = end,
483 .state = vio_dring_state,
484 };
485 int err, delay;
486 int retries = 0;
487
488 hdr.seq = dr->snd_nxt;
489 delay = 1;
490 do {
491 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
492 if (err > 0) {
493 dr->snd_nxt++;
494 break;
495 }
496 udelay(delay);
497 if ((delay <<= 1) > 128)
498 delay = 128;
499 if (retries++ > VNET_MAX_RETRIES) {
500 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
501 port->raddr[0], port->raddr[1],
502 port->raddr[2], port->raddr[3],
503 port->raddr[4], port->raddr[5]);
504 break;
505 }
506 } while (err == -EAGAIN);
507
508 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
509 port->stop_rx_idx = end;
510 port->stop_rx = true;
511 } else {
512 port->stop_rx_idx = 0;
513 port->stop_rx = false;
514 }
515
516 return err;
517}
518
519static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
520 struct vio_dring_state *dr,
521 u32 index)
522{
523 struct vio_net_desc *desc = port->vio.desc_buf;
524 int err;
525
526 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
527 (index * dr->entry_size),
528 dr->cookies, dr->ncookies);
529 if (err < 0)
530 return ERR_PTR(err);
531
532 return desc;
533}
534
535static int put_rx_desc(struct vnet_port *port,
536 struct vio_dring_state *dr,
537 struct vio_net_desc *desc,
538 u32 index)
539{
540 int err;
541
542 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
543 (index * dr->entry_size),
544 dr->cookies, dr->ncookies);
545 if (err < 0)
546 return err;
547
548 return 0;
549}
550
551static int vnet_walk_rx_one(struct vnet_port *port,
552 struct vio_dring_state *dr,
553 u32 index, int *needs_ack)
554{
555 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
556 struct vio_driver_state *vio = &port->vio;
557 int err;
558
559 BUG_ON(!desc);
560 if (IS_ERR(desc))
561 return PTR_ERR(desc);
562
563 if (desc->hdr.state != VIO_DESC_READY)
564 return 1;
565
566 dma_rmb();
567
568 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
569 desc->hdr.state, desc->hdr.ack,
570 desc->size, desc->ncookies,
571 desc->cookies[0].cookie_addr,
572 desc->cookies[0].cookie_size);
573
574 err = vnet_rx_one(port, desc);
575 if (err == -ECONNRESET)
576 return err;
577 trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
578 index, desc->hdr.ack);
579 desc->hdr.state = VIO_DESC_DONE;
580 err = put_rx_desc(port, dr, desc, index);
581 if (err < 0)
582 return err;
583 *needs_ack = desc->hdr.ack;
584 return 0;
585}
586
587static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
588 u32 start, u32 end, int *npkts, int budget)
589{
590 struct vio_driver_state *vio = &port->vio;
591 int ack_start = -1, ack_end = -1;
592 bool send_ack = true;
593
594 end = (end == (u32)-1) ? vio_dring_prev(dr, start)
595 : vio_dring_next(dr, end);
596
597 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
598
599 while (start != end) {
600 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
601
602 if (err == -ECONNRESET)
603 return err;
604 if (err != 0)
605 break;
606 (*npkts)++;
607 if (ack_start == -1)
608 ack_start = start;
609 ack_end = start;
610 start = vio_dring_next(dr, start);
611 if (ack && start != end) {
612 err = vnet_send_ack(port, dr, ack_start, ack_end,
613 VIO_DRING_ACTIVE);
614 if (err == -ECONNRESET)
615 return err;
616 ack_start = -1;
617 }
618 if ((*npkts) >= budget) {
619 send_ack = false;
620 break;
621 }
622 }
623 if (unlikely(ack_start == -1)) {
624 ack_end = vio_dring_prev(dr, start);
625 ack_start = ack_end;
626 }
627 if (send_ack) {
628 port->napi_resume = false;
629 trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
630 port->vio._peer_sid,
631 ack_end, *npkts);
632 return vnet_send_ack(port, dr, ack_start, ack_end,
633 VIO_DRING_STOPPED);
634 } else {
635 trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
636 port->vio._peer_sid,
637 ack_end, *npkts);
638 port->napi_resume = true;
639 port->napi_stop_idx = ack_end;
640 return 1;
641 }
642}
643
644static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
645 int budget)
646{
647 struct vio_dring_data *pkt = msgbuf;
648 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
649 struct vio_driver_state *vio = &port->vio;
650
651 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
652 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
653
654 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
655 return 0;
656 if (unlikely(pkt->seq != dr->rcv_nxt)) {
657 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
658 pkt->seq, dr->rcv_nxt);
659 return 0;
660 }
661
662 if (!port->napi_resume)
663 dr->rcv_nxt++;
664
665 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
666
667 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
668 npkts, budget);
669}
670
671static int idx_is_pending(struct vio_dring_state *dr, u32 end)
672{
673 u32 idx = dr->cons;
674 int found = 0;
675
676 while (idx != dr->prod) {
677 if (idx == end) {
678 found = 1;
679 break;
680 }
681 idx = vio_dring_next(dr, idx);
682 }
683 return found;
684}
685
686static int vnet_ack(struct vnet_port *port, void *msgbuf)
687{
688 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
689 struct vio_dring_data *pkt = msgbuf;
690 struct net_device *dev;
691 u32 end;
692 struct vio_net_desc *desc;
693 struct netdev_queue *txq;
694
695 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
696 return 0;
697
698 end = pkt->end_idx;
699 dev = VNET_PORT_TO_NET_DEVICE(port);
700 netif_tx_lock(dev);
701 if (unlikely(!idx_is_pending(dr, end))) {
702 netif_tx_unlock(dev);
703 return 0;
704 }
705
706 /* sync for race conditions with vnet_start_xmit() and tell xmit it
707 * is time to send a trigger.
708 */
709 trace_vnet_rx_stopped_ack(port->vio._local_sid,
710 port->vio._peer_sid, end);
711 dr->cons = vio_dring_next(dr, end);
712 desc = vio_dring_entry(dr, dr->cons);
713 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
714 /* vnet_start_xmit() just populated this dring but missed
715 * sending the "start" LDC message to the consumer.
716 * Send a "start" trigger on its behalf.
717 */
718 if (__vnet_tx_trigger(port, dr->cons) > 0)
719 port->start_cons = false;
720 else
721 port->start_cons = true;
722 } else {
723 port->start_cons = true;
724 }
725 netif_tx_unlock(dev);
726
727 txq = netdev_get_tx_queue(dev, port->q_index);
728 if (unlikely(netif_tx_queue_stopped(txq) &&
729 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
730 return 1;
731
732 return 0;
733}
734
735static int vnet_nack(struct vnet_port *port, void *msgbuf)
736{
737 /* XXX just reset or similar XXX */
738 return 0;
739}
740
741static int handle_mcast(struct vnet_port *port, void *msgbuf)
742{
743 struct vio_net_mcast_info *pkt = msgbuf;
744 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
745
746 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
747 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
748 dev->name,
749 pkt->tag.type,
750 pkt->tag.stype,
751 pkt->tag.stype_env,
752 pkt->tag.sid);
753
754 return 0;
755}
756
757/* If the queue is stopped, wake it up so that we'll
758 * send out another START message at the next TX.
759 */
760static void maybe_tx_wakeup(struct vnet_port *port)
761{
762 struct netdev_queue *txq;
763
764 txq = netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
765 port->q_index);
766 __netif_tx_lock(txq, smp_processor_id());
767 if (likely(netif_tx_queue_stopped(txq)))
768 netif_tx_wake_queue(txq);
769 __netif_tx_unlock(txq);
770}
771
772bool sunvnet_port_is_up_common(struct vnet_port *vnet)
773{
774 struct vio_driver_state *vio = &vnet->vio;
775
776 return !!(vio->hs_state & VIO_HS_COMPLETE);
777}
778EXPORT_SYMBOL_GPL(sunvnet_port_is_up_common);
779
780static int vnet_event_napi(struct vnet_port *port, int budget)
781{
782 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
783 struct vio_driver_state *vio = &port->vio;
784 int tx_wakeup, err;
785 int npkts = 0;
786
787 /* we don't expect any other bits */
788 BUG_ON(port->rx_event & ~(LDC_EVENT_DATA_READY |
789 LDC_EVENT_RESET |
790 LDC_EVENT_UP));
791
792 /* RESET takes precedent over any other event */
793 if (port->rx_event & LDC_EVENT_RESET) {
794 /* a link went down */
795
796 if (port->vsw == 1) {
797 netif_tx_stop_all_queues(dev);
798 netif_carrier_off(dev);
799 }
800
801 vio_link_state_change(vio, LDC_EVENT_RESET);
802 vnet_port_reset(port);
803 vio_port_up(vio);
804
805 /* If the device is running but its tx queue was
806 * stopped (due to flow control), restart it.
807 * This is necessary since vnet_port_reset()
808 * clears the tx drings and thus we may never get
809 * back a VIO_TYPE_DATA ACK packet - which is
810 * the normal mechanism to restart the tx queue.
811 */
812 if (netif_running(dev))
813 maybe_tx_wakeup(port);
814
815 port->rx_event = 0;
816 port->stats.event_reset++;
817 return 0;
818 }
819
820 if (port->rx_event & LDC_EVENT_UP) {
821 /* a link came up */
822
823 if (port->vsw == 1) {
824 netif_carrier_on(port->dev);
825 netif_tx_start_all_queues(port->dev);
826 }
827
828 vio_link_state_change(vio, LDC_EVENT_UP);
829 port->rx_event = 0;
830 port->stats.event_up++;
831 return 0;
832 }
833
834 err = 0;
835 tx_wakeup = 0;
836 while (1) {
837 union {
838 struct vio_msg_tag tag;
839 u64 raw[8];
840 } msgbuf;
841
842 if (port->napi_resume) {
843 struct vio_dring_data *pkt =
844 (struct vio_dring_data *)&msgbuf;
845 struct vio_dring_state *dr =
846 &port->vio.drings[VIO_DRIVER_RX_RING];
847
848 pkt->tag.type = VIO_TYPE_DATA;
849 pkt->tag.stype = VIO_SUBTYPE_INFO;
850 pkt->tag.stype_env = VIO_DRING_DATA;
851 pkt->seq = dr->rcv_nxt;
852 pkt->start_idx = vio_dring_next(dr,
853 port->napi_stop_idx);
854 pkt->end_idx = -1;
855 } else {
856 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
857 if (unlikely(err < 0)) {
858 if (err == -ECONNRESET)
859 vio_conn_reset(vio);
860 break;
861 }
862 if (err == 0)
863 break;
864 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
865 msgbuf.tag.type,
866 msgbuf.tag.stype,
867 msgbuf.tag.stype_env,
868 msgbuf.tag.sid);
869 err = vio_validate_sid(vio, &msgbuf.tag);
870 if (err < 0)
871 break;
872 }
873
874 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
875 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
876 if (!sunvnet_port_is_up_common(port)) {
877 /* failures like handshake_failure()
878 * may have cleaned up dring, but
879 * NAPI polling may bring us here.
880 */
881 err = -ECONNRESET;
882 break;
883 }
884 err = vnet_rx(port, &msgbuf, &npkts, budget);
885 if (npkts >= budget)
886 break;
887 if (npkts == 0)
888 break;
889 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
890 err = vnet_ack(port, &msgbuf);
891 if (err > 0)
892 tx_wakeup |= err;
893 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
894 err = vnet_nack(port, &msgbuf);
895 }
896 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
897 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
898 err = handle_mcast(port, &msgbuf);
899 else
900 err = vio_control_pkt_engine(vio, &msgbuf);
901 if (err)
902 break;
903 } else {
904 err = vnet_handle_unknown(port, &msgbuf);
905 }
906 if (err == -ECONNRESET)
907 break;
908 }
909 if (unlikely(tx_wakeup && err != -ECONNRESET))
910 maybe_tx_wakeup(port);
911 return npkts;
912}
913
914int sunvnet_poll_common(struct napi_struct *napi, int budget)
915{
916 struct vnet_port *port = container_of(napi, struct vnet_port, napi);
917 struct vio_driver_state *vio = &port->vio;
918 int processed = vnet_event_napi(port, budget);
919
920 if (processed < budget) {
921 napi_complete_done(napi, processed);
922 port->rx_event &= ~LDC_EVENT_DATA_READY;
923 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
924 }
925 return processed;
926}
927EXPORT_SYMBOL_GPL(sunvnet_poll_common);
928
929void sunvnet_event_common(void *arg, int event)
930{
931 struct vnet_port *port = arg;
932 struct vio_driver_state *vio = &port->vio;
933
934 port->rx_event |= event;
935 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
936 napi_schedule(&port->napi);
937}
938EXPORT_SYMBOL_GPL(sunvnet_event_common);
939
940static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
941{
942 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
943 struct vio_dring_data hdr = {
944 .tag = {
945 .type = VIO_TYPE_DATA,
946 .stype = VIO_SUBTYPE_INFO,
947 .stype_env = VIO_DRING_DATA,
948 .sid = vio_send_sid(&port->vio),
949 },
950 .dring_ident = dr->ident,
951 .start_idx = start,
952 .end_idx = (u32)-1,
953 };
954 int err, delay;
955 int retries = 0;
956
957 if (port->stop_rx) {
958 trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
959 port->vio._peer_sid,
960 port->stop_rx_idx, -1);
961 err = vnet_send_ack(port,
962 &port->vio.drings[VIO_DRIVER_RX_RING],
963 port->stop_rx_idx, -1,
964 VIO_DRING_STOPPED);
965 if (err <= 0)
966 return err;
967 }
968
969 hdr.seq = dr->snd_nxt;
970 delay = 1;
971 do {
972 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
973 if (err > 0) {
974 dr->snd_nxt++;
975 break;
976 }
977 udelay(delay);
978 if ((delay <<= 1) > 128)
979 delay = 128;
980 if (retries++ > VNET_MAX_RETRIES)
981 break;
982 } while (err == -EAGAIN);
983 trace_vnet_tx_trigger(port->vio._local_sid,
984 port->vio._peer_sid, start, err);
985
986 return err;
987}
988
989static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
990 unsigned *pending)
991{
992 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
993 struct sk_buff *skb = NULL;
994 int i, txi;
995
996 *pending = 0;
997
998 txi = dr->prod;
999 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1000 struct vio_net_desc *d;
1001
1002 --txi;
1003 if (txi < 0)
1004 txi = VNET_TX_RING_SIZE - 1;
1005
1006 d = vio_dring_entry(dr, txi);
1007
1008 if (d->hdr.state == VIO_DESC_READY) {
1009 (*pending)++;
1010 continue;
1011 }
1012 if (port->tx_bufs[txi].skb) {
1013 if (d->hdr.state != VIO_DESC_DONE)
1014 pr_notice("invalid ring buffer state %d\n",
1015 d->hdr.state);
1016 BUG_ON(port->tx_bufs[txi].skb->next);
1017
1018 port->tx_bufs[txi].skb->next = skb;
1019 skb = port->tx_bufs[txi].skb;
1020 port->tx_bufs[txi].skb = NULL;
1021
1022 ldc_unmap(port->vio.lp,
1023 port->tx_bufs[txi].cookies,
1024 port->tx_bufs[txi].ncookies);
1025 } else if (d->hdr.state == VIO_DESC_FREE) {
1026 break;
1027 }
1028 d->hdr.state = VIO_DESC_FREE;
1029 }
1030 return skb;
1031}
1032
1033static inline void vnet_free_skbs(struct sk_buff *skb)
1034{
1035 struct sk_buff *next;
1036
1037 while (skb) {
1038 next = skb->next;
1039 skb->next = NULL;
1040 dev_kfree_skb(skb);
1041 skb = next;
1042 }
1043}
1044
1045void sunvnet_clean_timer_expire_common(struct timer_list *t)
1046{
1047 struct vnet_port *port = from_timer(port, t, clean_timer);
1048 struct sk_buff *freeskbs;
1049 unsigned pending;
1050
1051 netif_tx_lock(VNET_PORT_TO_NET_DEVICE(port));
1052 freeskbs = vnet_clean_tx_ring(port, &pending);
1053 netif_tx_unlock(VNET_PORT_TO_NET_DEVICE(port));
1054
1055 vnet_free_skbs(freeskbs);
1056
1057 if (pending)
1058 (void)mod_timer(&port->clean_timer,
1059 jiffies + VNET_CLEAN_TIMEOUT);
1060 else
1061 del_timer(&port->clean_timer);
1062}
1063EXPORT_SYMBOL_GPL(sunvnet_clean_timer_expire_common);
1064
1065static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
1066 struct ldc_trans_cookie *cookies, int ncookies,
1067 unsigned int map_perm)
1068{
1069 int i, nc, err, blen;
1070
1071 /* header */
1072 blen = skb_headlen(skb);
1073 if (blen < ETH_ZLEN)
1074 blen = ETH_ZLEN;
1075 blen += VNET_PACKET_SKIP;
1076 blen += 8 - (blen & 7);
1077
1078 err = ldc_map_single(lp, skb->data - VNET_PACKET_SKIP, blen, cookies,
1079 ncookies, map_perm);
1080 if (err < 0)
1081 return err;
1082 nc = err;
1083
1084 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1085 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1086 u8 *vaddr;
1087
1088 if (nc < ncookies) {
1089 vaddr = kmap_local_page(skb_frag_page(f));
1090 blen = skb_frag_size(f);
1091 blen += 8 - (blen & 7);
1092 err = ldc_map_single(lp, vaddr + skb_frag_off(f),
1093 blen, cookies + nc, ncookies - nc,
1094 map_perm);
1095 kunmap_local(vaddr);
1096 } else {
1097 err = -EMSGSIZE;
1098 }
1099
1100 if (err < 0) {
1101 ldc_unmap(lp, cookies, nc);
1102 return err;
1103 }
1104 nc += err;
1105 }
1106 return nc;
1107}
1108
1109static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
1110{
1111 struct sk_buff *nskb;
1112 int i, len, pad, docopy;
1113
1114 len = skb->len;
1115 pad = 0;
1116 if (len < ETH_ZLEN) {
1117 pad += ETH_ZLEN - skb->len;
1118 len += pad;
1119 }
1120 len += VNET_PACKET_SKIP;
1121 pad += 8 - (len & 7);
1122
1123 /* make sure we have enough cookies and alignment in every frag */
1124 docopy = skb_shinfo(skb)->nr_frags >= ncookies;
1125 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1126 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1127
1128 docopy |= skb_frag_off(f) & 7;
1129 }
1130 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
1131 skb_tailroom(skb) < pad ||
1132 skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
1133 int start = 0, offset;
1134 __wsum csum;
1135
1136 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
1137 nskb = alloc_and_align_skb(skb->dev, len);
1138 if (!nskb) {
1139 dev_kfree_skb(skb);
1140 return NULL;
1141 }
1142 skb_reserve(nskb, VNET_PACKET_SKIP);
1143
1144 nskb->protocol = skb->protocol;
1145 offset = skb_mac_header(skb) - skb->data;
1146 skb_set_mac_header(nskb, offset);
1147 offset = skb_network_header(skb) - skb->data;
1148 skb_set_network_header(nskb, offset);
1149 offset = skb_transport_header(skb) - skb->data;
1150 skb_set_transport_header(nskb, offset);
1151
1152 offset = 0;
1153 nskb->csum_offset = skb->csum_offset;
1154 nskb->ip_summed = skb->ip_summed;
1155
1156 if (skb->ip_summed == CHECKSUM_PARTIAL)
1157 start = skb_checksum_start_offset(skb);
1158 if (start) {
1159 int offset = start + nskb->csum_offset;
1160
1161 /* copy the headers, no csum here */
1162 if (skb_copy_bits(skb, 0, nskb->data, start)) {
1163 dev_kfree_skb(nskb);
1164 dev_kfree_skb(skb);
1165 return NULL;
1166 }
1167
1168 /* copy the rest, with csum calculation */
1169 *(__sum16 *)(skb->data + offset) = 0;
1170 csum = skb_copy_and_csum_bits(skb, start,
1171 nskb->data + start,
1172 skb->len - start);
1173
1174 /* add in the header checksums */
1175 if (skb->protocol == htons(ETH_P_IP)) {
1176 struct iphdr *iph = ip_hdr(nskb);
1177
1178 if (iph->protocol == IPPROTO_TCP ||
1179 iph->protocol == IPPROTO_UDP) {
1180 csum = csum_tcpudp_magic(iph->saddr,
1181 iph->daddr,
1182 skb->len - start,
1183 iph->protocol,
1184 csum);
1185 }
1186 } else if (skb->protocol == htons(ETH_P_IPV6)) {
1187 struct ipv6hdr *ip6h = ipv6_hdr(nskb);
1188
1189 if (ip6h->nexthdr == IPPROTO_TCP ||
1190 ip6h->nexthdr == IPPROTO_UDP) {
1191 csum = csum_ipv6_magic(&ip6h->saddr,
1192 &ip6h->daddr,
1193 skb->len - start,
1194 ip6h->nexthdr,
1195 csum);
1196 }
1197 }
1198
1199 /* save the final result */
1200 *(__sum16 *)(nskb->data + offset) = csum;
1201
1202 nskb->ip_summed = CHECKSUM_NONE;
1203 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
1204 dev_kfree_skb(nskb);
1205 dev_kfree_skb(skb);
1206 return NULL;
1207 }
1208 (void)skb_put(nskb, skb->len);
1209 if (skb_is_gso(skb)) {
1210 skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
1211 skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
1212 }
1213 nskb->queue_mapping = skb->queue_mapping;
1214 dev_kfree_skb(skb);
1215 skb = nskb;
1216 }
1217 return skb;
1218}
1219
1220static netdev_tx_t
1221vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb,
1222 struct vnet_port *(*vnet_tx_port)
1223 (struct sk_buff *, struct net_device *))
1224{
1225 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
1226 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1227 struct sk_buff *segs, *curr, *next;
1228 int maclen, datalen;
1229 int status;
1230 int gso_size, gso_type, gso_segs;
1231 int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1232 int proto = IPPROTO_IP;
1233
1234 if (skb->protocol == htons(ETH_P_IP))
1235 proto = ip_hdr(skb)->protocol;
1236 else if (skb->protocol == htons(ETH_P_IPV6))
1237 proto = ipv6_hdr(skb)->nexthdr;
1238
1239 if (proto == IPPROTO_TCP) {
1240 hlen += tcp_hdr(skb)->doff * 4;
1241 } else if (proto == IPPROTO_UDP) {
1242 hlen += sizeof(struct udphdr);
1243 } else {
1244 pr_err("vnet_handle_offloads GSO with unknown transport "
1245 "protocol %d tproto %d\n", skb->protocol, proto);
1246 hlen = 128; /* XXX */
1247 }
1248 datalen = port->tsolen - hlen;
1249
1250 gso_size = skb_shinfo(skb)->gso_size;
1251 gso_type = skb_shinfo(skb)->gso_type;
1252 gso_segs = skb_shinfo(skb)->gso_segs;
1253
1254 if (port->tso && gso_size < datalen)
1255 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1256
1257 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1258 struct netdev_queue *txq;
1259
1260 txq = netdev_get_tx_queue(dev, port->q_index);
1261 netif_tx_stop_queue(txq);
1262 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1263 return NETDEV_TX_BUSY;
1264 netif_tx_wake_queue(txq);
1265 }
1266
1267 maclen = skb_network_header(skb) - skb_mac_header(skb);
1268 skb_pull(skb, maclen);
1269
1270 if (port->tso && gso_size < datalen) {
1271 if (skb_unclone(skb, GFP_ATOMIC))
1272 goto out_dropped;
1273
1274 /* segment to TSO size */
1275 skb_shinfo(skb)->gso_size = datalen;
1276 skb_shinfo(skb)->gso_segs = gso_segs;
1277 }
1278 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1279 if (IS_ERR(segs))
1280 goto out_dropped;
1281
1282 skb_push(skb, maclen);
1283 skb_reset_mac_header(skb);
1284
1285 status = 0;
1286 skb_list_walk_safe(segs, curr, next) {
1287 skb_mark_not_on_list(curr);
1288 if (port->tso && curr->len > dev->mtu) {
1289 skb_shinfo(curr)->gso_size = gso_size;
1290 skb_shinfo(curr)->gso_type = gso_type;
1291 skb_shinfo(curr)->gso_segs =
1292 DIV_ROUND_UP(curr->len - hlen, gso_size);
1293 } else {
1294 skb_shinfo(curr)->gso_size = 0;
1295 }
1296
1297 skb_push(curr, maclen);
1298 skb_reset_mac_header(curr);
1299 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1300 maclen);
1301 curr->csum_start = skb_transport_header(curr) - curr->head;
1302 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1303 curr->csum_offset = offsetof(struct tcphdr, check);
1304 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1305 curr->csum_offset = offsetof(struct udphdr, check);
1306
1307 if (!(status & NETDEV_TX_MASK))
1308 status = sunvnet_start_xmit_common(curr, dev,
1309 vnet_tx_port);
1310 if (status & NETDEV_TX_MASK)
1311 dev_kfree_skb_any(curr);
1312 }
1313
1314 if (!(status & NETDEV_TX_MASK))
1315 dev_kfree_skb_any(skb);
1316 return status;
1317out_dropped:
1318 dev->stats.tx_dropped++;
1319 dev_kfree_skb_any(skb);
1320 return NETDEV_TX_OK;
1321}
1322
1323netdev_tx_t
1324sunvnet_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 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1356 htonl(localmtu));
1357#if IS_ENABLED(CONFIG_IPV6)
1358 else if (skb->protocol == htons(ETH_P_IPV6))
1359 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1360#endif
1361 goto out_dropped;
1362 }
1363
1364 skb = vnet_skb_shape(skb, 2);
1365
1366 if (unlikely(!skb))
1367 goto out_dropped;
1368
1369 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1370 if (skb->protocol == htons(ETH_P_IP))
1371 vnet_fullcsum_ipv4(skb);
1372#if IS_ENABLED(CONFIG_IPV6)
1373 else if (skb->protocol == htons(ETH_P_IPV6))
1374 vnet_fullcsum_ipv6(skb);
1375#endif
1376 }
1377
1378 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1379 i = skb_get_queue_mapping(skb);
1380 txq = netdev_get_tx_queue(dev, i);
1381 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1382 if (!netif_tx_queue_stopped(txq)) {
1383 netif_tx_stop_queue(txq);
1384
1385 /* This is a hard error, log it. */
1386 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1387 dev->stats.tx_errors++;
1388 }
1389 rcu_read_unlock();
1390 return NETDEV_TX_BUSY;
1391 }
1392
1393 d = vio_dring_cur(dr);
1394
1395 txi = dr->prod;
1396
1397 freeskbs = vnet_clean_tx_ring(port, &pending);
1398
1399 BUG_ON(port->tx_bufs[txi].skb);
1400
1401 len = skb->len;
1402 if (len < ETH_ZLEN)
1403 len = ETH_ZLEN;
1404
1405 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1406 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1407 if (err < 0) {
1408 netdev_info(dev, "tx buffer map error %d\n", err);
1409 goto out_dropped;
1410 }
1411
1412 port->tx_bufs[txi].skb = skb;
1413 skb = NULL;
1414 port->tx_bufs[txi].ncookies = err;
1415
1416 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1417 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1418 * the protocol itself does not require it as long as the peer
1419 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1420 *
1421 * An ACK for every packet in the ring is expensive as the
1422 * sending of LDC messages is slow and affects performance.
1423 */
1424 d->hdr.ack = VIO_ACK_DISABLE;
1425 d->size = len;
1426 d->ncookies = port->tx_bufs[txi].ncookies;
1427 for (i = 0; i < d->ncookies; i++)
1428 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1429 if (vio_version_after_eq(&port->vio, 1, 7)) {
1430 struct vio_net_dext *dext = vio_net_ext(d);
1431
1432 memset(dext, 0, sizeof(*dext));
1433 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1434 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1435 ->gso_size;
1436 dext->flags |= VNET_PKT_IPV4_LSO;
1437 }
1438 if (vio_version_after_eq(&port->vio, 1, 8) &&
1439 !port->switch_port) {
1440 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1441 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1442 }
1443 }
1444
1445 /* This has to be a non-SMP write barrier because we are writing
1446 * to memory which is shared with the peer LDOM.
1447 */
1448 dma_wmb();
1449
1450 d->hdr.state = VIO_DESC_READY;
1451
1452 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1453 * to notify the consumer that some descriptors are READY.
1454 * After that "start" trigger, no additional triggers are needed until
1455 * a DRING_STOPPED is received from the consumer. The dr->cons field
1456 * (set up by vnet_ack()) has the value of the next dring index
1457 * that has not yet been ack-ed. We send a "start" trigger here
1458 * if, and only if, start_cons is true (reset it afterward). Conversely,
1459 * vnet_ack() should check if the dring corresponding to cons
1460 * is marked READY, but start_cons was false.
1461 * If so, vnet_ack() should send out the missed "start" trigger.
1462 *
1463 * Note that the dma_wmb() above makes sure the cookies et al. are
1464 * not globally visible before the VIO_DESC_READY, and that the
1465 * stores are ordered correctly by the compiler. The consumer will
1466 * not proceed until the VIO_DESC_READY is visible assuring that
1467 * the consumer does not observe anything related to descriptors
1468 * out of order. The HV trap from the LDC start trigger is the
1469 * producer to consumer announcement that work is available to the
1470 * consumer
1471 */
1472 if (!port->start_cons) { /* previous trigger suffices */
1473 trace_vnet_skip_tx_trigger(port->vio._local_sid,
1474 port->vio._peer_sid, dr->cons);
1475 goto ldc_start_done;
1476 }
1477
1478 err = __vnet_tx_trigger(port, dr->cons);
1479 if (unlikely(err < 0)) {
1480 netdev_info(dev, "TX trigger error %d\n", err);
1481 d->hdr.state = VIO_DESC_FREE;
1482 skb = port->tx_bufs[txi].skb;
1483 port->tx_bufs[txi].skb = NULL;
1484 dev->stats.tx_carrier_errors++;
1485 goto out_dropped;
1486 }
1487
1488ldc_start_done:
1489 port->start_cons = false;
1490
1491 dev->stats.tx_packets++;
1492 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1493 port->stats.tx_packets++;
1494 port->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1495
1496 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1497 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1498 netif_tx_stop_queue(txq);
1499 smp_rmb();
1500 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1501 netif_tx_wake_queue(txq);
1502 }
1503
1504 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1505 rcu_read_unlock();
1506
1507 vnet_free_skbs(freeskbs);
1508
1509 return NETDEV_TX_OK;
1510
1511out_dropped:
1512 if (pending)
1513 (void)mod_timer(&port->clean_timer,
1514 jiffies + VNET_CLEAN_TIMEOUT);
1515 else if (port)
1516 del_timer(&port->clean_timer);
1517 rcu_read_unlock();
1518 dev_kfree_skb(skb);
1519 vnet_free_skbs(freeskbs);
1520 dev->stats.tx_dropped++;
1521 return NETDEV_TX_OK;
1522}
1523EXPORT_SYMBOL_GPL(sunvnet_start_xmit_common);
1524
1525void sunvnet_tx_timeout_common(struct net_device *dev, unsigned int txqueue)
1526{
1527 /* XXX Implement me XXX */
1528}
1529EXPORT_SYMBOL_GPL(sunvnet_tx_timeout_common);
1530
1531int sunvnet_open_common(struct net_device *dev)
1532{
1533 netif_carrier_on(dev);
1534 netif_tx_start_all_queues(dev);
1535
1536 return 0;
1537}
1538EXPORT_SYMBOL_GPL(sunvnet_open_common);
1539
1540int sunvnet_close_common(struct net_device *dev)
1541{
1542 netif_tx_stop_all_queues(dev);
1543 netif_carrier_off(dev);
1544
1545 return 0;
1546}
1547EXPORT_SYMBOL_GPL(sunvnet_close_common);
1548
1549static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1550{
1551 struct vnet_mcast_entry *m;
1552
1553 for (m = vp->mcast_list; m; m = m->next) {
1554 if (ether_addr_equal(m->addr, addr))
1555 return m;
1556 }
1557 return NULL;
1558}
1559
1560static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1561{
1562 struct netdev_hw_addr *ha;
1563
1564 netdev_for_each_mc_addr(ha, dev) {
1565 struct vnet_mcast_entry *m;
1566
1567 m = __vnet_mc_find(vp, ha->addr);
1568 if (m) {
1569 m->hit = 1;
1570 continue;
1571 }
1572
1573 if (!m) {
1574 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1575 if (!m)
1576 continue;
1577 memcpy(m->addr, ha->addr, ETH_ALEN);
1578 m->hit = 1;
1579
1580 m->next = vp->mcast_list;
1581 vp->mcast_list = m;
1582 }
1583 }
1584}
1585
1586static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1587{
1588 struct vio_net_mcast_info info;
1589 struct vnet_mcast_entry *m, **pp;
1590 int n_addrs;
1591
1592 memset(&info, 0, sizeof(info));
1593
1594 info.tag.type = VIO_TYPE_CTRL;
1595 info.tag.stype = VIO_SUBTYPE_INFO;
1596 info.tag.stype_env = VNET_MCAST_INFO;
1597 info.tag.sid = vio_send_sid(&port->vio);
1598 info.set = 1;
1599
1600 n_addrs = 0;
1601 for (m = vp->mcast_list; m; m = m->next) {
1602 if (m->sent)
1603 continue;
1604 m->sent = 1;
1605 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1606 m->addr, ETH_ALEN);
1607 if (++n_addrs == VNET_NUM_MCAST) {
1608 info.count = n_addrs;
1609
1610 (void)vio_ldc_send(&port->vio, &info,
1611 sizeof(info));
1612 n_addrs = 0;
1613 }
1614 }
1615 if (n_addrs) {
1616 info.count = n_addrs;
1617 (void)vio_ldc_send(&port->vio, &info, sizeof(info));
1618 }
1619
1620 info.set = 0;
1621
1622 n_addrs = 0;
1623 pp = &vp->mcast_list;
1624 while ((m = *pp) != NULL) {
1625 if (m->hit) {
1626 m->hit = 0;
1627 pp = &m->next;
1628 continue;
1629 }
1630
1631 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1632 m->addr, ETH_ALEN);
1633 if (++n_addrs == VNET_NUM_MCAST) {
1634 info.count = n_addrs;
1635 (void)vio_ldc_send(&port->vio, &info,
1636 sizeof(info));
1637 n_addrs = 0;
1638 }
1639
1640 *pp = m->next;
1641 kfree(m);
1642 }
1643 if (n_addrs) {
1644 info.count = n_addrs;
1645 (void)vio_ldc_send(&port->vio, &info, sizeof(info));
1646 }
1647}
1648
1649void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp)
1650{
1651 struct vnet_port *port;
1652
1653 rcu_read_lock();
1654 list_for_each_entry_rcu(port, &vp->port_list, list) {
1655 if (port->switch_port) {
1656 __update_mc_list(vp, dev);
1657 __send_mc_list(vp, port);
1658 break;
1659 }
1660 }
1661 rcu_read_unlock();
1662}
1663EXPORT_SYMBOL_GPL(sunvnet_set_rx_mode_common);
1664
1665int sunvnet_set_mac_addr_common(struct net_device *dev, void *p)
1666{
1667 return -EINVAL;
1668}
1669EXPORT_SYMBOL_GPL(sunvnet_set_mac_addr_common);
1670
1671void sunvnet_port_free_tx_bufs_common(struct vnet_port *port)
1672{
1673 struct vio_dring_state *dr;
1674 int i;
1675
1676 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1677
1678 if (!dr->base)
1679 return;
1680
1681 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1682 struct vio_net_desc *d;
1683 void *skb = port->tx_bufs[i].skb;
1684
1685 if (!skb)
1686 continue;
1687
1688 d = vio_dring_entry(dr, i);
1689
1690 ldc_unmap(port->vio.lp,
1691 port->tx_bufs[i].cookies,
1692 port->tx_bufs[i].ncookies);
1693 dev_kfree_skb(skb);
1694 port->tx_bufs[i].skb = NULL;
1695 d->hdr.state = VIO_DESC_FREE;
1696 }
1697 ldc_free_exp_dring(port->vio.lp, dr->base,
1698 (dr->entry_size * dr->num_entries),
1699 dr->cookies, dr->ncookies);
1700 dr->base = NULL;
1701 dr->entry_size = 0;
1702 dr->num_entries = 0;
1703 dr->pending = 0;
1704 dr->ncookies = 0;
1705}
1706EXPORT_SYMBOL_GPL(sunvnet_port_free_tx_bufs_common);
1707
1708void vnet_port_reset(struct vnet_port *port)
1709{
1710 del_timer(&port->clean_timer);
1711 sunvnet_port_free_tx_bufs_common(port);
1712 port->rmtu = 0;
1713 port->tso = (port->vsw == 0); /* no tso in vsw, misbehaves in bridge */
1714 port->tsolen = 0;
1715}
1716EXPORT_SYMBOL_GPL(vnet_port_reset);
1717
1718static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1719{
1720 struct vio_dring_state *dr;
1721 unsigned long len, elen;
1722 int i, err, ncookies;
1723 void *dring;
1724
1725 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1726
1727 elen = sizeof(struct vio_net_desc) +
1728 sizeof(struct ldc_trans_cookie) * 2;
1729 if (vio_version_after_eq(&port->vio, 1, 7))
1730 elen += sizeof(struct vio_net_dext);
1731 len = VNET_TX_RING_SIZE * elen;
1732
1733 ncookies = VIO_MAX_RING_COOKIES;
1734 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1735 dr->cookies, &ncookies,
1736 (LDC_MAP_SHADOW |
1737 LDC_MAP_DIRECT |
1738 LDC_MAP_RW));
1739 if (IS_ERR(dring)) {
1740 err = PTR_ERR(dring);
1741 goto err_out;
1742 }
1743
1744 dr->base = dring;
1745 dr->entry_size = elen;
1746 dr->num_entries = VNET_TX_RING_SIZE;
1747 dr->prod = 0;
1748 dr->cons = 0;
1749 port->start_cons = true; /* need an initial trigger */
1750 dr->pending = VNET_TX_RING_SIZE;
1751 dr->ncookies = ncookies;
1752
1753 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1754 struct vio_net_desc *d;
1755
1756 d = vio_dring_entry(dr, i);
1757 d->hdr.state = VIO_DESC_FREE;
1758 }
1759 return 0;
1760
1761err_out:
1762 sunvnet_port_free_tx_bufs_common(port);
1763
1764 return err;
1765}
1766
1767#ifdef CONFIG_NET_POLL_CONTROLLER
1768void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp)
1769{
1770 struct vnet_port *port;
1771 unsigned long flags;
1772
1773 spin_lock_irqsave(&vp->lock, flags);
1774 if (!list_empty(&vp->port_list)) {
1775 port = list_entry(vp->port_list.next, struct vnet_port, list);
1776 napi_schedule(&port->napi);
1777 }
1778 spin_unlock_irqrestore(&vp->lock, flags);
1779}
1780EXPORT_SYMBOL_GPL(sunvnet_poll_controller_common);
1781#endif
1782
1783void sunvnet_port_add_txq_common(struct vnet_port *port)
1784{
1785 struct vnet *vp = port->vp;
1786 int smallest = 0;
1787 int i;
1788
1789 /* find the first least-used q
1790 * When there are more ldoms than q's, we start to
1791 * double up on ports per queue.
1792 */
1793 for (i = 0; i < VNET_MAX_TXQS; i++) {
1794 if (vp->q_used[i] == 0) {
1795 smallest = i;
1796 break;
1797 }
1798 if (vp->q_used[i] < vp->q_used[smallest])
1799 smallest = i;
1800 }
1801
1802 vp->nports++;
1803 vp->q_used[smallest]++;
1804 port->q_index = smallest;
1805}
1806EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common);
1807
1808void sunvnet_port_rm_txq_common(struct vnet_port *port)
1809{
1810 port->vp->nports--;
1811 port->vp->q_used[port->q_index]--;
1812 port->q_index = 0;
1813}
1814EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common);