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sunvnet: count multicast packets
[mirror_ubuntu-artful-kernel.git] / drivers / net / ethernet / sun / sunvnet_common.c
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31762eaa
AY		 1/* sunvnet.c: Sun LDOM Virtual Network Driver.
2 *
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
867fa150 4 * Copyright (C) 2016-2017 Oracle. All rights reserved.
31762eaa
AY		 5 */
6
7#include <linux/module.h>
8#include <linux/kernel.h>
9#include <linux/types.h>
10#include <linux/slab.h>
11#include <linux/delay.h>
12#include <linux/init.h>
13#include <linux/netdevice.h>
14#include <linux/ethtool.h>
15#include <linux/etherdevice.h>
16#include <linux/mutex.h>
17#include <linux/highmem.h>
18#include <linux/if_vlan.h>
19#define CREATE_TRACE_POINTS
20#include <trace/events/sunvnet.h>
21
22#if IS_ENABLED(CONFIG_IPV6)
23#include <linux/icmpv6.h>
24#endif
25
26#include <net/ip.h>
27#include <net/icmp.h>
28#include <net/route.h>
29
30#include <asm/vio.h>
31#include <asm/ldc.h>
32
33#include "sunvnet_common.h"
34
35/* Heuristic for the number of times to exponentially backoff and
36 * retry sending an LDC trigger when EAGAIN is encountered
37 */
38#define VNET_MAX_RETRIES 10
39
2493b842
SN		 40MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
41MODULE_DESCRIPTION("Sun LDOM virtual network support library");
42MODULE_LICENSE("GPL");
43MODULE_VERSION("1.1");
44
31762eaa 45static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
31762eaa
AY		 46
47static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
48{
49 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
50}
51
52static int vnet_handle_unknown(struct vnet_port *port, void *arg)
53{
54 struct vio_msg_tag *pkt = arg;
55
56 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
57 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
58 pr_err("Resetting connection\n");
59
60 ldc_disconnect(port->vio.lp);
61
62 return -ECONNRESET;
63}
64
65static int vnet_port_alloc_tx_ring(struct vnet_port *port);
66
67int sunvnet_send_attr_common(struct vio_driver_state *vio)
68{
69 struct vnet_port *port = to_vnet_port(vio);
67d0719f 70 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
31762eaa
AY		 71 struct vio_net_attr_info pkt;
72 int framelen = ETH_FRAME_LEN;
73 int i, err;
74
75 err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
76 if (err)
77 return err;
78
79 memset(&pkt, 0, sizeof(pkt));
80 pkt.tag.type = VIO_TYPE_CTRL;
81 pkt.tag.stype = VIO_SUBTYPE_INFO;
82 pkt.tag.stype_env = VIO_ATTR_INFO;
83 pkt.tag.sid = vio_send_sid(vio);
84 if (vio_version_before(vio, 1, 2))
85 pkt.xfer_mode = VIO_DRING_MODE;
86 else
87 pkt.xfer_mode = VIO_NEW_DRING_MODE;
88 pkt.addr_type = VNET_ADDR_ETHERMAC;
89 pkt.ack_freq = 0;
90 for (i = 0; i < 6; i++)
91 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
92 if (vio_version_after(vio, 1, 3)) {
93 if (port->rmtu) {
94 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
95 pkt.mtu = port->rmtu;
96 } else {
97 port->rmtu = VNET_MAXPACKET;
98 pkt.mtu = port->rmtu;
99 }
100 if (vio_version_after_eq(vio, 1, 6))
101 pkt.options = VIO_TX_DRING;
102 } else if (vio_version_before(vio, 1, 3)) {
103 pkt.mtu = framelen;
104 } else { /* v1.3 */
105 pkt.mtu = framelen + VLAN_HLEN;
106 }
107
108 pkt.cflags = 0;
109 if (vio_version_after_eq(vio, 1, 7) && port->tso) {
110 pkt.cflags |= VNET_LSO_IPV4_CAPAB;
111 if (!port->tsolen)
112 port->tsolen = VNET_MAXTSO;
113 pkt.ipv4_lso_maxlen = port->tsolen;
114 }
115
116 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
117
118 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
119 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
120 "cflags[0x%04x] lso_max[%u]\n",
121 pkt.xfer_mode, pkt.addr_type,
122 (unsigned long long)pkt.addr,
123 pkt.ack_freq, pkt.plnk_updt, pkt.options,
124 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
125
31762eaa
AY		 126 return vio_ldc_send(vio, &pkt, sizeof(pkt));
127}
128EXPORT_SYMBOL_GPL(sunvnet_send_attr_common);
129
130static int handle_attr_info(struct vio_driver_state *vio,
131 struct vio_net_attr_info *pkt)
132{
133 struct vnet_port *port = to_vnet_port(vio);
134 u64 localmtu;
135 u8 xfer_mode;
136
137 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
138 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
139 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
140 pkt->xfer_mode, pkt->addr_type,
141 (unsigned long long)pkt->addr,
142 pkt->ack_freq, pkt->plnk_updt, pkt->options,
143 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
144 pkt->ipv4_lso_maxlen);
145
146 pkt->tag.sid = vio_send_sid(vio);
147
148 xfer_mode = pkt->xfer_mode;
149 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
150 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
151 xfer_mode = VIO_NEW_DRING_MODE;
152
153 /* MTU negotiation:
154 * < v1.3 - ETH_FRAME_LEN exactly
155 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
156 * pkt->mtu for ACK
157 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
158 */
159 if (vio_version_before(vio, 1, 3)) {
160 localmtu = ETH_FRAME_LEN;
161 } else if (vio_version_after(vio, 1, 3)) {
162 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
163 localmtu = min(pkt->mtu, localmtu);
164 pkt->mtu = localmtu;
165 } else { /* v1.3 */
166 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
167 }
168 port->rmtu = localmtu;
169
170 /* LSO negotiation */
171 if (vio_version_after_eq(vio, 1, 7))
172 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
173 else
174 port->tso = false;
175 if (port->tso) {
176 if (!port->tsolen)
177 port->tsolen = VNET_MAXTSO;
178 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
179 if (port->tsolen < VNET_MINTSO) {
180 port->tso = false;
181 port->tsolen = 0;
182 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
183 }
184 pkt->ipv4_lso_maxlen = port->tsolen;
185 } else {
186 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
187 pkt->ipv4_lso_maxlen = 0;
bc221a34 188 port->tsolen = 0;
31762eaa
AY		 189 }
190
191 /* for version >= 1.6, ACK packet mode we support */
192 if (vio_version_after_eq(vio, 1, 6)) {
193 pkt->xfer_mode = VIO_NEW_DRING_MODE;
194 pkt->options = VIO_TX_DRING;
195 }
196
197 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
198 pkt->addr_type != VNET_ADDR_ETHERMAC ||
199 pkt->mtu != localmtu) {
200 viodbg(HS, "SEND NET ATTR NACK\n");
201
202 pkt->tag.stype = VIO_SUBTYPE_NACK;
203
dc153f85 204 (void)vio_ldc_send(vio, pkt, sizeof(*pkt));
31762eaa
AY		 205
206 return -ECONNRESET;
31762eaa
AY		 207 }
208
dc153f85
AY		 209 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
210 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
211 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
212 pkt->xfer_mode, pkt->addr_type,
213 (unsigned long long)pkt->addr,
214 pkt->ack_freq, pkt->plnk_updt, pkt->options,
215 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
216 pkt->ipv4_lso_maxlen);
217
218 pkt->tag.stype = VIO_SUBTYPE_ACK;
219
220 return vio_ldc_send(vio, pkt, sizeof(*pkt));
31762eaa
AY		 221}
222
223static int handle_attr_ack(struct vio_driver_state *vio,
224 struct vio_net_attr_info *pkt)
225{
226 viodbg(HS, "GOT NET ATTR ACK\n");
227
228 return 0;
229}
230
231static int handle_attr_nack(struct vio_driver_state *vio,
232 struct vio_net_attr_info *pkt)
233{
234 viodbg(HS, "GOT NET ATTR NACK\n");
235
236 return -ECONNRESET;
237}
238
239int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg)
240{
241 struct vio_net_attr_info *pkt = arg;
242
243 switch (pkt->tag.stype) {
244 case VIO_SUBTYPE_INFO:
245 return handle_attr_info(vio, pkt);
246
247 case VIO_SUBTYPE_ACK:
248 return handle_attr_ack(vio, pkt);
249
250 case VIO_SUBTYPE_NACK:
251 return handle_attr_nack(vio, pkt);
252
253 default:
254 return -ECONNRESET;
255 }
256}
257EXPORT_SYMBOL_GPL(sunvnet_handle_attr_common);
258
259void sunvnet_handshake_complete_common(struct vio_driver_state *vio)
260{
261 struct vio_dring_state *dr;
262
263 dr = &vio->drings[VIO_DRIVER_RX_RING];
dc153f85
AY		 264 dr->rcv_nxt = 1;
265 dr->snd_nxt = 1;
31762eaa
AY		 266
267 dr = &vio->drings[VIO_DRIVER_TX_RING];
dc153f85
AY		 268 dr->rcv_nxt = 1;
269 dr->snd_nxt = 1;
31762eaa
AY		 270}
271EXPORT_SYMBOL_GPL(sunvnet_handshake_complete_common);
272
273/* The hypervisor interface that implements copying to/from imported
274 * memory from another domain requires that copies are done to 8-byte
275 * aligned buffers, and that the lengths of such copies are also 8-byte
276 * multiples.
277 *
278 * So we align skb->data to an 8-byte multiple and pad-out the data
279 * area so we can round the copy length up to the next multiple of
280 * 8 for the copy.
281 *
282 * The transmitter puts the actual start of the packet 6 bytes into
283 * the buffer it sends over, so that the IP headers after the ethernet
284 * header are aligned properly. These 6 bytes are not in the descriptor
285 * length, they are simply implied. This offset is represented using
286 * the VNET_PACKET_SKIP macro.
287 */
288static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
289 unsigned int len)
290{
dc153f85 291 struct sk_buff *skb;
31762eaa
AY		 292 unsigned long addr, off;
293
dc153f85 294 skb = netdev_alloc_skb(dev, len + VNET_PACKET_SKIP + 8 + 8);
31762eaa
AY		 295 if (unlikely(!skb))
296 return NULL;
297
dc153f85 298 addr = (unsigned long)skb->data;
31762eaa
AY		 299 off = ((addr + 7UL) & ~7UL) - addr;
300 if (off)
301 skb_reserve(skb, off);
302
303 return skb;
304}
305
306static inline void vnet_fullcsum(struct sk_buff *skb)
307{
308 struct iphdr *iph = ip_hdr(skb);
309 int offset = skb_transport_offset(skb);
310
311 if (skb->protocol != htons(ETH_P_IP))
312 return;
313 if (iph->protocol != IPPROTO_TCP &&
314 iph->protocol != IPPROTO_UDP)
315 return;
316 skb->ip_summed = CHECKSUM_NONE;
317 skb->csum_level = 1;
318 skb->csum = 0;
319 if (iph->protocol == IPPROTO_TCP) {
320 struct tcphdr *ptcp = tcp_hdr(skb);
321
322 ptcp->check = 0;
323 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
324 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
325 skb->len - offset, IPPROTO_TCP,
326 skb->csum);
327 } else if (iph->protocol == IPPROTO_UDP) {
328 struct udphdr *pudp = udp_hdr(skb);
329
330 pudp->check = 0;
331 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
332 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
333 skb->len - offset, IPPROTO_UDP,
334 skb->csum);
335 }
336}
337
338static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
339{
67d0719f 340 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
31762eaa
AY		 341 unsigned int len = desc->size;
342 unsigned int copy_len;
343 struct sk_buff *skb;
344 int maxlen;
345 int err;
346
347 err = -EMSGSIZE;
348 if (port->tso && port->tsolen > port->rmtu)
349 maxlen = port->tsolen;
350 else
351 maxlen = port->rmtu;
352 if (unlikely(len < ETH_ZLEN || len > maxlen)) {
353 dev->stats.rx_length_errors++;
354 goto out_dropped;
355 }
356
357 skb = alloc_and_align_skb(dev, len);
358 err = -ENOMEM;
359 if (unlikely(!skb)) {
360 dev->stats.rx_missed_errors++;
361 goto out_dropped;
362 }
363
364 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
365 skb_put(skb, copy_len);
366 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
367 skb->data, copy_len, 0,
368 desc->cookies, desc->ncookies);
369 if (unlikely(err < 0)) {
370 dev->stats.rx_frame_errors++;
371 goto out_free_skb;
372 }
373
374 skb_pull(skb, VNET_PACKET_SKIP);
375 skb_trim(skb, len);
376 skb->protocol = eth_type_trans(skb, dev);
377
378 if (vio_version_after_eq(&port->vio, 1, 8)) {
379 struct vio_net_dext *dext = vio_net_ext(desc);
380
381 skb_reset_network_header(skb);
382
383 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
384 if (skb->protocol == ETH_P_IP) {
385 struct iphdr *iph = ip_hdr(skb);
386
387 iph->check = 0;
388 ip_send_check(iph);
389 }
390 }
391 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
392 skb->ip_summed == CHECKSUM_NONE) {
393 if (skb->protocol == htons(ETH_P_IP)) {
394 struct iphdr *iph = ip_hdr(skb);
395 int ihl = iph->ihl * 4;
396
397 skb_reset_transport_header(skb);
398 skb_set_transport_header(skb, ihl);
399 vnet_fullcsum(skb);
400 }
401 }
402 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
403 skb->ip_summed = CHECKSUM_PARTIAL;
404 skb->csum_level = 0;
405 if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
406 skb->csum_level = 1;
407 }
408 }
409
410 skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
411
b12a96f5
SN		 412 if (unlikely(is_multicast_ether_addr(eth_hdr(skb)->h_dest)))
413 dev->stats.multicast++;
31762eaa
AY		 414 dev->stats.rx_packets++;
415 dev->stats.rx_bytes += len;
0f512c84
SN		 416 port->stats.rx_packets++;
417 port->stats.rx_bytes += len;
31762eaa
AY		 418 napi_gro_receive(&port->napi, skb);
419 return 0;
420
421out_free_skb:
422 kfree_skb(skb);
423
424out_dropped:
425 dev->stats.rx_dropped++;
426 return err;
427}
428
429static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
430 u32 start, u32 end, u8 vio_dring_state)
431{
432 struct vio_dring_data hdr = {
433 .tag = {
434 .type = VIO_TYPE_DATA,
435 .stype = VIO_SUBTYPE_ACK,
436 .stype_env = VIO_DRING_DATA,
437 .sid = vio_send_sid(&port->vio),
438 },
439 .dring_ident = dr->ident,
440 .start_idx = start,
441 .end_idx = end,
442 .state = vio_dring_state,
443 };
444 int err, delay;
445 int retries = 0;
446
447 hdr.seq = dr->snd_nxt;
448 delay = 1;
449 do {
450 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
451 if (err > 0) {
452 dr->snd_nxt++;
453 break;
454 }
455 udelay(delay);
456 if ((delay <<= 1) > 128)
457 delay = 128;
458 if (retries++ > VNET_MAX_RETRIES) {
459 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
460 port->raddr[0], port->raddr[1],
461 port->raddr[2], port->raddr[3],
462 port->raddr[4], port->raddr[5]);
463 break;
464 }
465 } while (err == -EAGAIN);
466
467 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
468 port->stop_rx_idx = end;
469 port->stop_rx = true;
470 } else {
471 port->stop_rx_idx = 0;
472 port->stop_rx = false;
473 }
474
475 return err;
476}
477
478static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
479 struct vio_dring_state *dr,
480 u32 index)
481{
482 struct vio_net_desc *desc = port->vio.desc_buf;
483 int err;
484
485 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
486 (index * dr->entry_size),
487 dr->cookies, dr->ncookies);
488 if (err < 0)
489 return ERR_PTR(err);
490
491 return desc;
492}
493
494static int put_rx_desc(struct vnet_port *port,
495 struct vio_dring_state *dr,
496 struct vio_net_desc *desc,
497 u32 index)
498{
499 int err;
500
501 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
502 (index * dr->entry_size),
503 dr->cookies, dr->ncookies);
504 if (err < 0)
505 return err;
506
507 return 0;
508}
509
510static int vnet_walk_rx_one(struct vnet_port *port,
511 struct vio_dring_state *dr,
512 u32 index, int *needs_ack)
513{
514 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
515 struct vio_driver_state *vio = &port->vio;
516 int err;
517
dc153f85 518 BUG_ON(!desc);
31762eaa
AY		 519 if (IS_ERR(desc))
520 return PTR_ERR(desc);
521
522 if (desc->hdr.state != VIO_DESC_READY)
523 return 1;
524
525 dma_rmb();
526
527 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
528 desc->hdr.state, desc->hdr.ack,
529 desc->size, desc->ncookies,
530 desc->cookies[0].cookie_addr,
531 desc->cookies[0].cookie_size);
532
533 err = vnet_rx_one(port, desc);
534 if (err == -ECONNRESET)
535 return err;
536 trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
537 index, desc->hdr.ack);
538 desc->hdr.state = VIO_DESC_DONE;
539 err = put_rx_desc(port, dr, desc, index);
540 if (err < 0)
541 return err;
542 *needs_ack = desc->hdr.ack;
543 return 0;
544}
545
546static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
547 u32 start, u32 end, int *npkts, int budget)
548{
549 struct vio_driver_state *vio = &port->vio;
550 int ack_start = -1, ack_end = -1;
551 bool send_ack = true;
552
dc153f85
AY		 553 end = (end == (u32)-1) ? vio_dring_prev(dr, start)
554 : vio_dring_next(dr, end);
31762eaa
AY		 555
556 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
557
558 while (start != end) {
559 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
dc153f85 560
31762eaa
AY		 561 if (err == -ECONNRESET)
562 return err;
563 if (err != 0)
564 break;
565 (*npkts)++;
566 if (ack_start == -1)
567 ack_start = start;
568 ack_end = start;
569 start = vio_dring_next(dr, start);
570 if (ack && start != end) {
571 err = vnet_send_ack(port, dr, ack_start, ack_end,
572 VIO_DRING_ACTIVE);
573 if (err == -ECONNRESET)
574 return err;
575 ack_start = -1;
576 }
577 if ((*npkts) >= budget) {
578 send_ack = false;
579 break;
580 }
581 }
dc153f85
AY		 582 if (unlikely(ack_start == -1)) {
583 ack_end = vio_dring_prev(dr, start);
584 ack_start = ack_end;
585 }
31762eaa
AY		 586 if (send_ack) {
587 port->napi_resume = false;
588 trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
589 port->vio._peer_sid,
590 ack_end, *npkts);
591 return vnet_send_ack(port, dr, ack_start, ack_end,
592 VIO_DRING_STOPPED);
593 } else {
594 trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
595 port->vio._peer_sid,
596 ack_end, *npkts);
597 port->napi_resume = true;
598 port->napi_stop_idx = ack_end;
599 return 1;
600 }
601}
602
603static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
604 int budget)
605{
606 struct vio_dring_data *pkt = msgbuf;
607 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
608 struct vio_driver_state *vio = &port->vio;
609
610 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
611 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
612
613 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
614 return 0;
615 if (unlikely(pkt->seq != dr->rcv_nxt)) {
616 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
617 pkt->seq, dr->rcv_nxt);
618 return 0;
619 }
620
621 if (!port->napi_resume)
622 dr->rcv_nxt++;
623
624 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
625
626 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
627 npkts, budget);
628}
629
630static int idx_is_pending(struct vio_dring_state *dr, u32 end)
631{
632 u32 idx = dr->cons;
633 int found = 0;
634
635 while (idx != dr->prod) {
636 if (idx == end) {
637 found = 1;
638 break;
639 }
640 idx = vio_dring_next(dr, idx);
641 }
642 return found;
643}
644
645static int vnet_ack(struct vnet_port *port, void *msgbuf)
646{
647 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
648 struct vio_dring_data *pkt = msgbuf;
649 struct net_device *dev;
31762eaa
AY		 650 u32 end;
651 struct vio_net_desc *desc;
652 struct netdev_queue *txq;
653
654 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
655 return 0;
656
657 end = pkt->end_idx;
67d0719f 658 dev = VNET_PORT_TO_NET_DEVICE(port);
31762eaa
AY		 659 netif_tx_lock(dev);
660 if (unlikely(!idx_is_pending(dr, end))) {
661 netif_tx_unlock(dev);
662 return 0;
663 }
664
665 /* sync for race conditions with vnet_start_xmit() and tell xmit it
666 * is time to send a trigger.
667 */
668 trace_vnet_rx_stopped_ack(port->vio._local_sid,
669 port->vio._peer_sid, end);
670 dr->cons = vio_dring_next(dr, end);
671 desc = vio_dring_entry(dr, dr->cons);
672 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
673 /* vnet_start_xmit() just populated this dring but missed
674 * sending the "start" LDC message to the consumer.
675 * Send a "start" trigger on its behalf.
676 */
677 if (__vnet_tx_trigger(port, dr->cons) > 0)
678 port->start_cons = false;
679 else
680 port->start_cons = true;
681 } else {
682 port->start_cons = true;
683 }
684 netif_tx_unlock(dev);
685
686 txq = netdev_get_tx_queue(dev, port->q_index);
687 if (unlikely(netif_tx_queue_stopped(txq) &&
688 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
689 return 1;
690
691 return 0;
692}
693
694static int vnet_nack(struct vnet_port *port, void *msgbuf)
695{
696 /* XXX just reset or similar XXX */
697 return 0;
698}
699
700static int handle_mcast(struct vnet_port *port, void *msgbuf)
701{
702 struct vio_net_mcast_info *pkt = msgbuf;
67d0719f 703 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
31762eaa
AY		 704
705 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
706 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
67d0719f 707 dev->name,
31762eaa
AY		 708 pkt->tag.type,
709 pkt->tag.stype,
710 pkt->tag.stype_env,
711 pkt->tag.sid);
712
713 return 0;
714}
715
8778b276
AY		 716/* If the queue is stopped, wake it up so that we'll
717 * send out another START message at the next TX.
31762eaa
AY		 718 */
719static void maybe_tx_wakeup(struct vnet_port *port)
720{
721 struct netdev_queue *txq;
722
67d0719f
AY		 723 txq = netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
724 port->q_index);
31762eaa 725 __netif_tx_lock(txq, smp_processor_id());
d4aa89cc 726 if (likely(netif_tx_queue_stopped(txq)))
31762eaa 727 netif_tx_wake_queue(txq);
31762eaa
AY		 728 __netif_tx_unlock(txq);
729}
730
67d0719f 731bool sunvnet_port_is_up_common(struct vnet_port *vnet)
31762eaa
AY		 732{
733 struct vio_driver_state *vio = &vnet->vio;
734
735 return !!(vio->hs_state & VIO_HS_COMPLETE);
736}
67d0719f 737EXPORT_SYMBOL_GPL(sunvnet_port_is_up_common);
31762eaa
AY		 738
739static int vnet_event_napi(struct vnet_port *port, int budget)
740{
8778b276 741 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
31762eaa
AY		 742 struct vio_driver_state *vio = &port->vio;
743 int tx_wakeup, err;
744 int npkts = 0;
bf091f3f
SN		 745
746 /* we don't expect any other bits */
747 BUG_ON(port->rx_event & ~(LDC_EVENT_DATA_READY |
748 LDC_EVENT_RESET |
749 LDC_EVENT_UP));
750
751 /* RESET takes precedent over any other event */
752 if (port->rx_event & LDC_EVENT_RESET) {
867fa150
SN		 753 /* a link went down */
754
755 if (port->vsw == 1) {
756 netif_tx_stop_all_queues(dev);
757 netif_carrier_off(dev);
758 }
759
bf091f3f
SN		 760 vio_link_state_change(vio, LDC_EVENT_RESET);
761 vnet_port_reset(port);
762 vio_port_up(vio);
763
764 /* If the device is running but its tx queue was
765 * stopped (due to flow control), restart it.
766 * This is necessary since vnet_port_reset()
767 * clears the tx drings and thus we may never get
768 * back a VIO_TYPE_DATA ACK packet - which is
769 * the normal mechanism to restart the tx queue.
770 */
771 if (netif_running(dev))
772 maybe_tx_wakeup(port);
773
31762eaa 774 port->rx_event = 0;
0f512c84 775 port->stats.event_reset++;
31762eaa
AY		 776 return 0;
777 }
31762eaa 778
bf091f3f 779 if (port->rx_event & LDC_EVENT_UP) {
867fa150
SN		 780 /* a link came up */
781
782 if (port->vsw == 1) {
783 netif_carrier_on(port->dev);
784 netif_tx_start_all_queues(port->dev);
785 }
786
bf091f3f
SN		 787 vio_link_state_change(vio, LDC_EVENT_UP);
788 port->rx_event = 0;
0f512c84 789 port->stats.event_up++;
bf091f3f
SN		 790 return 0;
791 }
31762eaa 792
dc153f85
AY		 793 err = 0;
794 tx_wakeup = 0;
31762eaa
AY		 795 while (1) {
796 union {
797 struct vio_msg_tag tag;
798 u64 raw[8];
799 } msgbuf;
800
801 if (port->napi_resume) {
802 struct vio_dring_data *pkt =
803 (struct vio_dring_data *)&msgbuf;
804 struct vio_dring_state *dr =
805 &port->vio.drings[VIO_DRIVER_RX_RING];
806
807 pkt->tag.type = VIO_TYPE_DATA;
808 pkt->tag.stype = VIO_SUBTYPE_INFO;
809 pkt->tag.stype_env = VIO_DRING_DATA;
810 pkt->seq = dr->rcv_nxt;
dc153f85
AY		 811 pkt->start_idx = vio_dring_next(dr,
812 port->napi_stop_idx);
31762eaa 813 pkt->end_idx = -1;
bf091f3f
SN		 814 } else {
815 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
816 if (unlikely(err < 0)) {
817 if (err == -ECONNRESET)
818 vio_conn_reset(vio);
819 break;
820 }
821 if (err == 0)
822 break;
823 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
824 msgbuf.tag.type,
825 msgbuf.tag.stype,
826 msgbuf.tag.stype_env,
827 msgbuf.tag.sid);
828 err = vio_validate_sid(vio, &msgbuf.tag);
829 if (err < 0)
830 break;
31762eaa 831 }
bf091f3f 832
31762eaa
AY		 833 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
834 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
67d0719f 835 if (!sunvnet_port_is_up_common(port)) {
31762eaa
AY		 836 /* failures like handshake_failure()
837 * may have cleaned up dring, but
838 * NAPI polling may bring us here.
839 */
840 err = -ECONNRESET;
841 break;
842 }
843 err = vnet_rx(port, &msgbuf, &npkts, budget);
844 if (npkts >= budget)
845 break;
846 if (npkts == 0)
847 break;
848 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
849 err = vnet_ack(port, &msgbuf);
850 if (err > 0)
851 tx_wakeup |= err;
852 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
853 err = vnet_nack(port, &msgbuf);
854 }
855 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
856 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
857 err = handle_mcast(port, &msgbuf);
858 else
859 err = vio_control_pkt_engine(vio, &msgbuf);
860 if (err)
861 break;
862 } else {
863 err = vnet_handle_unknown(port, &msgbuf);
864 }
865 if (err == -ECONNRESET)
866 break;
867 }
868 if (unlikely(tx_wakeup && err != -ECONNRESET))
869 maybe_tx_wakeup(port);
870 return npkts;
871}
872
873int sunvnet_poll_common(struct napi_struct *napi, int budget)
874{
875 struct vnet_port *port = container_of(napi, struct vnet_port, napi);
876 struct vio_driver_state *vio = &port->vio;
877 int processed = vnet_event_napi(port, budget);
878
879 if (processed < budget) {
6ad20165 880 napi_complete_done(napi, processed);
31762eaa
AY		 881 port->rx_event &= ~LDC_EVENT_DATA_READY;
882 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
883 }
884 return processed;
885}
886EXPORT_SYMBOL_GPL(sunvnet_poll_common);
887
888void sunvnet_event_common(void *arg, int event)
889{
890 struct vnet_port *port = arg;
891 struct vio_driver_state *vio = &port->vio;
892
893 port->rx_event |= event;
894 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
895 napi_schedule(&port->napi);
31762eaa
AY		 896}
897EXPORT_SYMBOL_GPL(sunvnet_event_common);
898
899static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
900{
901 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
902 struct vio_dring_data hdr = {
903 .tag = {
904 .type = VIO_TYPE_DATA,
905 .stype = VIO_SUBTYPE_INFO,
906 .stype_env = VIO_DRING_DATA,
907 .sid = vio_send_sid(&port->vio),
908 },
909 .dring_ident = dr->ident,
910 .start_idx = start,
dc153f85 911 .end_idx = (u32)-1,
31762eaa
AY		 912 };
913 int err, delay;
914 int retries = 0;
915
916 if (port->stop_rx) {
917 trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
918 port->vio._peer_sid,
919 port->stop_rx_idx, -1);
920 err = vnet_send_ack(port,
921 &port->vio.drings[VIO_DRIVER_RX_RING],
922 port->stop_rx_idx, -1,
923 VIO_DRING_STOPPED);
924 if (err <= 0)
925 return err;
926 }
927
928 hdr.seq = dr->snd_nxt;
929 delay = 1;
930 do {
931 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
932 if (err > 0) {
933 dr->snd_nxt++;
934 break;
935 }
936 udelay(delay);
937 if ((delay <<= 1) > 128)
938 delay = 128;
939 if (retries++ > VNET_MAX_RETRIES)
940 break;
941 } while (err == -EAGAIN);
942 trace_vnet_tx_trigger(port->vio._local_sid,
943 port->vio._peer_sid, start, err);
944
945 return err;
946}
947
31762eaa
AY		 948static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
949 unsigned *pending)
950{
951 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
952 struct sk_buff *skb = NULL;
953 int i, txi;
954
955 *pending = 0;
956
957 txi = dr->prod;
958 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
959 struct vio_net_desc *d;
960
961 --txi;
962 if (txi < 0)
dc153f85 963 txi = VNET_TX_RING_SIZE - 1;
31762eaa
AY		 964
965 d = vio_dring_entry(dr, txi);
966
967 if (d->hdr.state == VIO_DESC_READY) {
968 (*pending)++;
969 continue;
970 }
971 if (port->tx_bufs[txi].skb) {
972 if (d->hdr.state != VIO_DESC_DONE)
973 pr_notice("invalid ring buffer state %d\n",
974 d->hdr.state);
975 BUG_ON(port->tx_bufs[txi].skb->next);
976
977 port->tx_bufs[txi].skb->next = skb;
978 skb = port->tx_bufs[txi].skb;
979 port->tx_bufs[txi].skb = NULL;
980
981 ldc_unmap(port->vio.lp,
982 port->tx_bufs[txi].cookies,
983 port->tx_bufs[txi].ncookies);
dc153f85 984 } else if (d->hdr.state == VIO_DESC_FREE) {
31762eaa 985 break;
dc153f85 986 }
31762eaa
AY		 987 d->hdr.state = VIO_DESC_FREE;
988 }
989 return skb;
990}
991
992static inline void vnet_free_skbs(struct sk_buff *skb)
993{
994 struct sk_buff *next;
995
996 while (skb) {
997 next = skb->next;
998 skb->next = NULL;
999 dev_kfree_skb(skb);
1000 skb = next;
1001 }
1002}
1003
1004void sunvnet_clean_timer_expire_common(unsigned long port0)
1005{
1006 struct vnet_port *port = (struct vnet_port *)port0;
1007 struct sk_buff *freeskbs;
1008 unsigned pending;
1009
67d0719f 1010 netif_tx_lock(VNET_PORT_TO_NET_DEVICE(port));
31762eaa 1011 freeskbs = vnet_clean_tx_ring(port, &pending);
67d0719f 1012 netif_tx_unlock(VNET_PORT_TO_NET_DEVICE(port));
31762eaa
AY		 1013
1014 vnet_free_skbs(freeskbs);
1015
1016 if (pending)
1017 (void)mod_timer(&port->clean_timer,
1018 jiffies + VNET_CLEAN_TIMEOUT);
1019 else
1020 del_timer(&port->clean_timer);
1021}
1022EXPORT_SYMBOL_GPL(sunvnet_clean_timer_expire_common);
1023
1024static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
1025 struct ldc_trans_cookie *cookies, int ncookies,
1026 unsigned int map_perm)
1027{
1028 int i, nc, err, blen;
1029
1030 /* header */
1031 blen = skb_headlen(skb);
1032 if (blen < ETH_ZLEN)
1033 blen = ETH_ZLEN;
1034 blen += VNET_PACKET_SKIP;
1035 blen += 8 - (blen & 7);
1036
dc153f85 1037 err = ldc_map_single(lp, skb->data - VNET_PACKET_SKIP, blen, cookies,
31762eaa
AY		 1038 ncookies, map_perm);
1039 if (err < 0)
1040 return err;
1041 nc = err;
1042
1043 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1044 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1045 u8 *vaddr;
1046
1047 if (nc < ncookies) {
1048 vaddr = kmap_atomic(skb_frag_page(f));
1049 blen = skb_frag_size(f);
1050 blen += 8 - (blen & 7);
1051 err = ldc_map_single(lp, vaddr + f->page_offset,
1052 blen, cookies + nc, ncookies - nc,
1053 map_perm);
1054 kunmap_atomic(vaddr);
1055 } else {
1056 err = -EMSGSIZE;
1057 }
1058
1059 if (err < 0) {
1060 ldc_unmap(lp, cookies, nc);
1061 return err;
1062 }
1063 nc += err;
1064 }
1065 return nc;
1066}
1067
1068static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
1069{
1070 struct sk_buff *nskb;
1071 int i, len, pad, docopy;
1072
1073 len = skb->len;
1074 pad = 0;
1075 if (len < ETH_ZLEN) {
1076 pad += ETH_ZLEN - skb->len;
1077 len += pad;
1078 }
1079 len += VNET_PACKET_SKIP;
1080 pad += 8 - (len & 7);
1081
1082 /* make sure we have enough cookies and alignment in every frag */
1083 docopy = skb_shinfo(skb)->nr_frags >= ncookies;
1084 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1085 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1086
1087 docopy |= f->page_offset & 7;
1088 }
1089 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
1090 skb_tailroom(skb) < pad ||
1091 skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
1092 int start = 0, offset;
1093 __wsum csum;
1094
1095 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
1096 nskb = alloc_and_align_skb(skb->dev, len);
dc153f85 1097 if (!nskb) {
31762eaa
AY		 1098 dev_kfree_skb(skb);
1099 return NULL;
1100 }
1101 skb_reserve(nskb, VNET_PACKET_SKIP);
1102
1103 nskb->protocol = skb->protocol;
1104 offset = skb_mac_header(skb) - skb->data;
1105 skb_set_mac_header(nskb, offset);
1106 offset = skb_network_header(skb) - skb->data;
1107 skb_set_network_header(nskb, offset);
1108 offset = skb_transport_header(skb) - skb->data;
1109 skb_set_transport_header(nskb, offset);
1110
1111 offset = 0;
1112 nskb->csum_offset = skb->csum_offset;
1113 nskb->ip_summed = skb->ip_summed;
1114
1115 if (skb->ip_summed == CHECKSUM_PARTIAL)
1116 start = skb_checksum_start_offset(skb);
1117 if (start) {
1118 struct iphdr *iph = ip_hdr(nskb);
1119 int offset = start + nskb->csum_offset;
1120
1121 if (skb_copy_bits(skb, 0, nskb->data, start)) {
1122 dev_kfree_skb(nskb);
1123 dev_kfree_skb(skb);
1124 return NULL;
1125 }
1126 *(__sum16 *)(skb->data + offset) = 0;
1127 csum = skb_copy_and_csum_bits(skb, start,
1128 nskb->data + start,
1129 skb->len - start, 0);
1130 if (iph->protocol == IPPROTO_TCP ||
1131 iph->protocol == IPPROTO_UDP) {
1132 csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
1133 skb->len - start,
1134 iph->protocol, csum);
1135 }
1136 *(__sum16 *)(nskb->data + offset) = csum;
1137
1138 nskb->ip_summed = CHECKSUM_NONE;
1139 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
1140 dev_kfree_skb(nskb);
1141 dev_kfree_skb(skb);
1142 return NULL;
1143 }
1144 (void)skb_put(nskb, skb->len);
1145 if (skb_is_gso(skb)) {
1146 skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
1147 skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
1148 }
1149 nskb->queue_mapping = skb->queue_mapping;
1150 dev_kfree_skb(skb);
1151 skb = nskb;
1152 }
1153 return skb;
1154}
1155
67d0719f
AY		 1156static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb,
1157 struct vnet_port *(*vnet_tx_port)
1158 (struct sk_buff *, struct net_device *))
31762eaa 1159{
67d0719f 1160 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
31762eaa
AY		 1161 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1162 struct sk_buff *segs;
1163 int maclen, datalen;
1164 int status;
1165 int gso_size, gso_type, gso_segs;
1166 int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1167 int proto = IPPROTO_IP;
1168
1169 if (skb->protocol == htons(ETH_P_IP))
1170 proto = ip_hdr(skb)->protocol;
1171 else if (skb->protocol == htons(ETH_P_IPV6))
1172 proto = ipv6_hdr(skb)->nexthdr;
1173
dc153f85 1174 if (proto == IPPROTO_TCP) {
31762eaa 1175 hlen += tcp_hdr(skb)->doff * 4;
dc153f85 1176 } else if (proto == IPPROTO_UDP) {
31762eaa 1177 hlen += sizeof(struct udphdr);
dc153f85 1178 } else {
31762eaa
AY		 1179 pr_err("vnet_handle_offloads GSO with unknown transport "
1180 "protocol %d tproto %d\n", skb->protocol, proto);
1181 hlen = 128; /* XXX */
1182 }
1183 datalen = port->tsolen - hlen;
1184
1185 gso_size = skb_shinfo(skb)->gso_size;
1186 gso_type = skb_shinfo(skb)->gso_type;
1187 gso_segs = skb_shinfo(skb)->gso_segs;
1188
1189 if (port->tso && gso_size < datalen)
1190 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1191
1192 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1193 struct netdev_queue *txq;
1194
1195 txq = netdev_get_tx_queue(dev, port->q_index);
1196 netif_tx_stop_queue(txq);
1197 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1198 return NETDEV_TX_BUSY;
1199 netif_tx_wake_queue(txq);
1200 }
1201
1202 maclen = skb_network_header(skb) - skb_mac_header(skb);
1203 skb_pull(skb, maclen);
1204
1205 if (port->tso && gso_size < datalen) {
1206 if (skb_unclone(skb, GFP_ATOMIC))
1207 goto out_dropped;
1208
1209 /* segment to TSO size */
1210 skb_shinfo(skb)->gso_size = datalen;
1211 skb_shinfo(skb)->gso_segs = gso_segs;
1212 }
1213 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1214 if (IS_ERR(segs))
1215 goto out_dropped;
1216
1217 skb_push(skb, maclen);
1218 skb_reset_mac_header(skb);
1219
1220 status = 0;
1221 while (segs) {
1222 struct sk_buff *curr = segs;
1223
1224 segs = segs->next;
1225 curr->next = NULL;
1226 if (port->tso && curr->len > dev->mtu) {
1227 skb_shinfo(curr)->gso_size = gso_size;
1228 skb_shinfo(curr)->gso_type = gso_type;
1229 skb_shinfo(curr)->gso_segs =
1230 DIV_ROUND_UP(curr->len - hlen, gso_size);
dc153f85 1231 } else {
31762eaa 1232 skb_shinfo(curr)->gso_size = 0;
dc153f85 1233 }
31762eaa
AY		 1234
1235 skb_push(curr, maclen);
1236 skb_reset_mac_header(curr);
1237 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1238 maclen);
1239 curr->csum_start = skb_transport_header(curr) - curr->head;
1240 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1241 curr->csum_offset = offsetof(struct tcphdr, check);
1242 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1243 curr->csum_offset = offsetof(struct udphdr, check);
1244
1245 if (!(status & NETDEV_TX_MASK))
67d0719f
AY		 1246 status = sunvnet_start_xmit_common(curr, dev,
1247 vnet_tx_port);
31762eaa
AY		 1248 if (status & NETDEV_TX_MASK)
1249 dev_kfree_skb_any(curr);
1250 }
1251
1252 if (!(status & NETDEV_TX_MASK))
1253 dev_kfree_skb_any(skb);
1254 return status;
1255out_dropped:
1256 dev->stats.tx_dropped++;
1257 dev_kfree_skb_any(skb);
1258 return NETDEV_TX_OK;
1259}
1260
67d0719f
AY		 1261int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
1262 struct vnet_port *(*vnet_tx_port)
1263 (struct sk_buff *, struct net_device *))
31762eaa 1264{
31762eaa
AY		 1265 struct vnet_port *port = NULL;
1266 struct vio_dring_state *dr;
1267 struct vio_net_desc *d;
1268 unsigned int len;
1269 struct sk_buff *freeskbs = NULL;
1270 int i, err, txi;
1271 unsigned pending = 0;
1272 struct netdev_queue *txq;
1273
1274 rcu_read_lock();
67d0719f 1275 port = vnet_tx_port(skb, dev);
daa86e50 1276 if (unlikely(!port))
31762eaa 1277 goto out_dropped;
31762eaa
AY		 1278
1279 if (skb_is_gso(skb) && skb->len > port->tsolen) {
67d0719f 1280 err = vnet_handle_offloads(port, skb, vnet_tx_port);
31762eaa
AY		 1281 rcu_read_unlock();
1282 return err;
1283 }
1284
1285 if (!skb_is_gso(skb) && skb->len > port->rmtu) {
1286 unsigned long localmtu = port->rmtu - ETH_HLEN;
1287
1288 if (vio_version_after_eq(&port->vio, 1, 3))
1289 localmtu -= VLAN_HLEN;
1290
1291 if (skb->protocol == htons(ETH_P_IP)) {
1292 struct flowi4 fl4;
1293 struct rtable *rt = NULL;
1294
1295 memset(&fl4, 0, sizeof(fl4));
1296 fl4.flowi4_oif = dev->ifindex;
1297 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
1298 fl4.daddr = ip_hdr(skb)->daddr;
1299 fl4.saddr = ip_hdr(skb)->saddr;
1300
1301 rt = ip_route_output_key(dev_net(dev), &fl4);
31762eaa
AY		 1302 if (!IS_ERR(rt)) {
1303 skb_dst_set(skb, &rt->dst);
1304 icmp_send(skb, ICMP_DEST_UNREACH,
1305 ICMP_FRAG_NEEDED,
1306 htonl(localmtu));
1307 }
1308 }
1309#if IS_ENABLED(CONFIG_IPV6)
1310 else if (skb->protocol == htons(ETH_P_IPV6))
1311 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1312#endif
1313 goto out_dropped;
1314 }
1315
1316 skb = vnet_skb_shape(skb, 2);
1317
1318 if (unlikely(!skb))
1319 goto out_dropped;
1320
1321 if (skb->ip_summed == CHECKSUM_PARTIAL)
1322 vnet_fullcsum(skb);
1323
1324 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1325 i = skb_get_queue_mapping(skb);
1326 txq = netdev_get_tx_queue(dev, i);
1327 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1328 if (!netif_tx_queue_stopped(txq)) {
1329 netif_tx_stop_queue(txq);
1330
1331 /* This is a hard error, log it. */
1332 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1333 dev->stats.tx_errors++;
1334 }
1335 rcu_read_unlock();
1336 return NETDEV_TX_BUSY;
1337 }
1338
1339 d = vio_dring_cur(dr);
1340
1341 txi = dr->prod;
1342
1343 freeskbs = vnet_clean_tx_ring(port, &pending);
1344
1345 BUG_ON(port->tx_bufs[txi].skb);
1346
1347 len = skb->len;
1348 if (len < ETH_ZLEN)
1349 len = ETH_ZLEN;
1350
1351 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1352 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1353 if (err < 0) {
1354 netdev_info(dev, "tx buffer map error %d\n", err);
1355 goto out_dropped;
1356 }
1357
1358 port->tx_bufs[txi].skb = skb;
1359 skb = NULL;
1360 port->tx_bufs[txi].ncookies = err;
1361
1362 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1363 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1364 * the protocol itself does not require it as long as the peer
1365 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1366 *
1367 * An ACK for every packet in the ring is expensive as the
1368 * sending of LDC messages is slow and affects performance.
1369 */
1370 d->hdr.ack = VIO_ACK_DISABLE;
1371 d->size = len;
1372 d->ncookies = port->tx_bufs[txi].ncookies;
1373 for (i = 0; i < d->ncookies; i++)
1374 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1375 if (vio_version_after_eq(&port->vio, 1, 7)) {
1376 struct vio_net_dext *dext = vio_net_ext(d);
1377
1378 memset(dext, 0, sizeof(*dext));
1379 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1380 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1381 ->gso_size;
1382 dext->flags |= VNET_PKT_IPV4_LSO;
1383 }
1384 if (vio_version_after_eq(&port->vio, 1, 8) &&
1385 !port->switch_port) {
1386 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1387 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1388 }
1389 }
1390
1391 /* This has to be a non-SMP write barrier because we are writing
1392 * to memory which is shared with the peer LDOM.
1393 */
1394 dma_wmb();
1395
1396 d->hdr.state = VIO_DESC_READY;
1397
1398 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1399 * to notify the consumer that some descriptors are READY.
1400 * After that "start" trigger, no additional triggers are needed until
1401 * a DRING_STOPPED is received from the consumer. The dr->cons field
1402 * (set up by vnet_ack()) has the value of the next dring index
1403 * that has not yet been ack-ed. We send a "start" trigger here
1404 * if, and only if, start_cons is true (reset it afterward). Conversely,
1405 * vnet_ack() should check if the dring corresponding to cons
1406 * is marked READY, but start_cons was false.
1407 * If so, vnet_ack() should send out the missed "start" trigger.
1408 *
1409 * Note that the dma_wmb() above makes sure the cookies et al. are
1410 * not globally visible before the VIO_DESC_READY, and that the
1411 * stores are ordered correctly by the compiler. The consumer will
1412 * not proceed until the VIO_DESC_READY is visible assuring that
1413 * the consumer does not observe anything related to descriptors
1414 * out of order. The HV trap from the LDC start trigger is the
1415 * producer to consumer announcement that work is available to the
1416 * consumer
1417 */
1418 if (!port->start_cons) { /* previous trigger suffices */
1419 trace_vnet_skip_tx_trigger(port->vio._local_sid,
1420 port->vio._peer_sid, dr->cons);
1421 goto ldc_start_done;
1422 }
1423
1424 err = __vnet_tx_trigger(port, dr->cons);
1425 if (unlikely(err < 0)) {
1426 netdev_info(dev, "TX trigger error %d\n", err);
1427 d->hdr.state = VIO_DESC_FREE;
1428 skb = port->tx_bufs[txi].skb;
1429 port->tx_bufs[txi].skb = NULL;
1430 dev->stats.tx_carrier_errors++;
1431 goto out_dropped;
1432 }
1433
1434ldc_start_done:
1435 port->start_cons = false;
1436
1437 dev->stats.tx_packets++;
1438 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
0f512c84
SN		 1439 port->stats.tx_packets++;
1440 port->stats.tx_bytes += port->tx_bufs[txi].skb->len;
31762eaa
AY		 1441
1442 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1443 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1444 netif_tx_stop_queue(txq);
fd263fb6 1445 smp_rmb();
31762eaa
AY		 1446 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1447 netif_tx_wake_queue(txq);
1448 }
1449
1450 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1451 rcu_read_unlock();
1452
1453 vnet_free_skbs(freeskbs);
1454
1455 return NETDEV_TX_OK;
1456
1457out_dropped:
1458 if (pending)
1459 (void)mod_timer(&port->clean_timer,
1460 jiffies + VNET_CLEAN_TIMEOUT);
1461 else if (port)
1462 del_timer(&port->clean_timer);
daa86e50 1463 rcu_read_unlock();
31762eaa
AY		 1464 if (skb)
1465 dev_kfree_skb(skb);
1466 vnet_free_skbs(freeskbs);
1467 dev->stats.tx_dropped++;
1468 return NETDEV_TX_OK;
1469}
1470EXPORT_SYMBOL_GPL(sunvnet_start_xmit_common);
1471
1472void sunvnet_tx_timeout_common(struct net_device *dev)
1473{
1474 /* XXX Implement me XXX */
1475}
1476EXPORT_SYMBOL_GPL(sunvnet_tx_timeout_common);
1477
1478int sunvnet_open_common(struct net_device *dev)
1479{
1480 netif_carrier_on(dev);
1481 netif_tx_start_all_queues(dev);
1482
1483 return 0;
1484}
1485EXPORT_SYMBOL_GPL(sunvnet_open_common);
1486
1487int sunvnet_close_common(struct net_device *dev)
1488{
1489 netif_tx_stop_all_queues(dev);
1490 netif_carrier_off(dev);
1491
1492 return 0;
1493}
1494EXPORT_SYMBOL_GPL(sunvnet_close_common);
1495
1496static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1497{
1498 struct vnet_mcast_entry *m;
1499
1500 for (m = vp->mcast_list; m; m = m->next) {
1501 if (ether_addr_equal(m->addr, addr))
1502 return m;
1503 }
1504 return NULL;
1505}
1506
1507static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1508{
1509 struct netdev_hw_addr *ha;
1510
1511 netdev_for_each_mc_addr(ha, dev) {
1512 struct vnet_mcast_entry *m;
1513
1514 m = __vnet_mc_find(vp, ha->addr);
1515 if (m) {
1516 m->hit = 1;
1517 continue;
1518 }
1519
1520 if (!m) {
1521 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1522 if (!m)
1523 continue;
1524 memcpy(m->addr, ha->addr, ETH_ALEN);
1525 m->hit = 1;
1526
1527 m->next = vp->mcast_list;
1528 vp->mcast_list = m;
1529 }
1530 }
1531}
1532
1533static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1534{
1535 struct vio_net_mcast_info info;
1536 struct vnet_mcast_entry *m, **pp;
1537 int n_addrs;
1538
1539 memset(&info, 0, sizeof(info));
1540
1541 info.tag.type = VIO_TYPE_CTRL;
1542 info.tag.stype = VIO_SUBTYPE_INFO;
1543 info.tag.stype_env = VNET_MCAST_INFO;
1544 info.tag.sid = vio_send_sid(&port->vio);
1545 info.set = 1;
1546
1547 n_addrs = 0;
1548 for (m = vp->mcast_list; m; m = m->next) {
1549 if (m->sent)
1550 continue;
1551 m->sent = 1;
1552 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1553 m->addr, ETH_ALEN);
1554 if (++n_addrs == VNET_NUM_MCAST) {
1555 info.count = n_addrs;
1556
dc153f85
AY		 1557 (void)vio_ldc_send(&port->vio, &info,
1558 sizeof(info));
31762eaa
AY		 1559 n_addrs = 0;
1560 }
1561 }
1562 if (n_addrs) {
1563 info.count = n_addrs;
dc153f85 1564 (void)vio_ldc_send(&port->vio, &info, sizeof(info));
31762eaa
AY		 1565 }
1566
1567 info.set = 0;
1568
1569 n_addrs = 0;
1570 pp = &vp->mcast_list;
1571 while ((m = *pp) != NULL) {
1572 if (m->hit) {
1573 m->hit = 0;
1574 pp = &m->next;
1575 continue;
1576 }
1577
1578 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1579 m->addr, ETH_ALEN);
1580 if (++n_addrs == VNET_NUM_MCAST) {
1581 info.count = n_addrs;
dc153f85
AY		 1582 (void)vio_ldc_send(&port->vio, &info,
1583 sizeof(info));
31762eaa
AY		 1584 n_addrs = 0;
1585 }
1586
1587 *pp = m->next;
1588 kfree(m);
1589 }
1590 if (n_addrs) {
1591 info.count = n_addrs;
dc153f85 1592 (void)vio_ldc_send(&port->vio, &info, sizeof(info));
31762eaa
AY		 1593 }
1594}
1595
67d0719f 1596void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp)
31762eaa 1597{
31762eaa
AY		 1598 struct vnet_port *port;
1599
1600 rcu_read_lock();
1601 list_for_each_entry_rcu(port, &vp->port_list, list) {
31762eaa
AY		 1602 if (port->switch_port) {
1603 __update_mc_list(vp, dev);
1604 __send_mc_list(vp, port);
1605 break;
1606 }
1607 }
1608 rcu_read_unlock();
1609}
1610EXPORT_SYMBOL_GPL(sunvnet_set_rx_mode_common);
1611
31762eaa
AY		 1612int sunvnet_set_mac_addr_common(struct net_device *dev, void *p)
1613{
1614 return -EINVAL;
1615}
1616EXPORT_SYMBOL_GPL(sunvnet_set_mac_addr_common);
1617
1618void sunvnet_port_free_tx_bufs_common(struct vnet_port *port)
1619{
1620 struct vio_dring_state *dr;
1621 int i;
1622
1623 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1624
dc153f85 1625 if (!dr->base)
31762eaa
AY		 1626 return;
1627
1628 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1629 struct vio_net_desc *d;
1630 void *skb = port->tx_bufs[i].skb;
1631
1632 if (!skb)
1633 continue;
1634
1635 d = vio_dring_entry(dr, i);
1636
1637 ldc_unmap(port->vio.lp,
1638 port->tx_bufs[i].cookies,
1639 port->tx_bufs[i].ncookies);
1640 dev_kfree_skb(skb);
1641 port->tx_bufs[i].skb = NULL;
1642 d->hdr.state = VIO_DESC_FREE;
1643 }
1644 ldc_free_exp_dring(port->vio.lp, dr->base,
1645 (dr->entry_size * dr->num_entries),
1646 dr->cookies, dr->ncookies);
1647 dr->base = NULL;
1648 dr->entry_size = 0;
1649 dr->num_entries = 0;
1650 dr->pending = 0;
1651 dr->ncookies = 0;
1652}
1653EXPORT_SYMBOL_GPL(sunvnet_port_free_tx_bufs_common);
1654
867fa150 1655void vnet_port_reset(struct vnet_port *port)
31762eaa
AY		 1656{
1657 del_timer(&port->clean_timer);
1658 sunvnet_port_free_tx_bufs_common(port);
1659 port->rmtu = 0;
bc221a34 1660 port->tso = (port->vsw == 0); /* no tso in vsw, misbehaves in bridge */
31762eaa
AY		 1661 port->tsolen = 0;
1662}
867fa150 1663EXPORT_SYMBOL_GPL(vnet_port_reset);
31762eaa
AY		 1664
1665static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1666{
1667 struct vio_dring_state *dr;
1668 unsigned long len, elen;
1669 int i, err, ncookies;
1670 void *dring;
1671
1672 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1673
1674 elen = sizeof(struct vio_net_desc) +
1675 sizeof(struct ldc_trans_cookie) * 2;
1676 if (vio_version_after_eq(&port->vio, 1, 7))
1677 elen += sizeof(struct vio_net_dext);
1678 len = VNET_TX_RING_SIZE * elen;
1679
1680 ncookies = VIO_MAX_RING_COOKIES;
1681 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1682 dr->cookies, &ncookies,
1683 (LDC_MAP_SHADOW |
1684 LDC_MAP_DIRECT |
1685 LDC_MAP_RW));
1686 if (IS_ERR(dring)) {
1687 err = PTR_ERR(dring);
1688 goto err_out;
1689 }
1690
1691 dr->base = dring;
1692 dr->entry_size = elen;
1693 dr->num_entries = VNET_TX_RING_SIZE;
dc153f85
AY		 1694 dr->prod = 0;
1695 dr->cons = 0;
31762eaa
AY		 1696 port->start_cons = true; /* need an initial trigger */
1697 dr->pending = VNET_TX_RING_SIZE;
1698 dr->ncookies = ncookies;
1699
1700 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1701 struct vio_net_desc *d;
1702
1703 d = vio_dring_entry(dr, i);
1704 d->hdr.state = VIO_DESC_FREE;
1705 }
1706 return 0;
1707
1708err_out:
1709 sunvnet_port_free_tx_bufs_common(port);
1710
1711 return err;
1712}
1713
1714#ifdef CONFIG_NET_POLL_CONTROLLER
67d0719f 1715void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp)
31762eaa 1716{
31762eaa
AY		 1717 struct vnet_port *port;
1718 unsigned long flags;
1719
1720 spin_lock_irqsave(&vp->lock, flags);
1721 if (!list_empty(&vp->port_list)) {
1722 port = list_entry(vp->port_list.next, struct vnet_port, list);
1723 napi_schedule(&port->napi);
1724 }
1725 spin_unlock_irqrestore(&vp->lock, flags);
1726}
1727EXPORT_SYMBOL_GPL(sunvnet_poll_controller_common);
1728#endif
1729
1730void sunvnet_port_add_txq_common(struct vnet_port *port)
1731{
1732 struct vnet *vp = port->vp;
e1f1e5f7
SN		 1733 int smallest = 0;
1734 int i;
1735
1736 /* find the first least-used q
1737 * When there are more ldoms than q's, we start to
1738 * double up on ports per queue.
1739 */
1740 for (i = 0; i < VNET_MAX_TXQS; i++) {
1741 if (vp->q_used[i] == 0) {
1742 smallest = i;
1743 break;
1744 }
1745 if (vp->q_used[i] < vp->q_used[smallest])
1746 smallest = i;
1747 }
31762eaa 1748
e1f1e5f7
SN		 1749 vp->nports++;
1750 vp->q_used[smallest]++;
1751 port->q_index = smallest;
67d0719f
AY		 1752 netif_tx_wake_queue(netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
1753 port->q_index));
31762eaa
AY		 1754}
1755EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common);
1756
1757void sunvnet_port_rm_txq_common(struct vnet_port *port)
1758{
1759 port->vp->nports--;
67d0719f
AY		 1760 netif_tx_stop_queue(netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
1761 port->q_index));
e1f1e5f7
SN		 1762 port->vp->q_used[port->q_index]--;
1763 port->q_index = 0;
31762eaa
AY		 1764}
1765EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common);
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