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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / ethernet / sun / sunvnet_common.c
blobc23ce838ff631280e981c9e0ab9d0bfce16c3ea9
1 // SPDX-License-Identifier: GPL-2.0
2 /* sunvnet.c: Sun LDOM Virtual Network Driver.
3 *
4 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
5 * Copyright (C) 2016-2017 Oracle. All rights reserved.
6 */
7
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11 #include <linux/slab.h>
12 #include <linux/delay.h>
13 #include <linux/init.h>
14 #include <linux/netdevice.h>
15 #include <linux/ethtool.h>
16 #include <linux/etherdevice.h>
17 #include <linux/mutex.h>
18 #include <linux/highmem.h>
19 #include <linux/if_vlan.h>
20 #define CREATE_TRACE_POINTS
21 #include <trace/events/sunvnet.h>
22
23 #if IS_ENABLED(CONFIG_IPV6)
24 #include <linux/icmpv6.h>
25 #endif
26
27 #include <net/ip.h>
28 #include <net/icmp.h>
29 #include <net/route.h>
30
31 #include <asm/vio.h>
32 #include <asm/ldc.h>
33
34 #include "sunvnet_common.h"
35
36 /* Heuristic for the number of times to exponentially backoff and
37 * retry sending an LDC trigger when EAGAIN is encountered
38 */
39 #define VNET_MAX_RETRIES 10
40
41 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
42 MODULE_DESCRIPTION("Sun LDOM virtual network support library");
43 MODULE_LICENSE("GPL");
44 MODULE_VERSION("1.1");
45
46 static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
47
48 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
49 {
50 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
51 }
52
53 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
54 {
55 struct vio_msg_tag *pkt = arg;
56
57 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
58 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
59 pr_err("Resetting connection\n");
60
61 ldc_disconnect(port->vio.lp);
62
63 return -ECONNRESET;
64 }
65
66 static int vnet_port_alloc_tx_ring(struct vnet_port *port);
67
68 int sunvnet_send_attr_common(struct vio_driver_state *vio)
69 {
70 struct vnet_port *port = to_vnet_port(vio);
71 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
72 struct vio_net_attr_info pkt;
73 int framelen = ETH_FRAME_LEN;
74 int i, err;
75
76 err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
77 if (err)
78 return err;
79
80 memset(&pkt, 0, sizeof(pkt));
81 pkt.tag.type = VIO_TYPE_CTRL;
82 pkt.tag.stype = VIO_SUBTYPE_INFO;
83 pkt.tag.stype_env = VIO_ATTR_INFO;
84 pkt.tag.sid = vio_send_sid(vio);
85 if (vio_version_before(vio, 1, 2))
86 pkt.xfer_mode = VIO_DRING_MODE;
87 else
88 pkt.xfer_mode = VIO_NEW_DRING_MODE;
89 pkt.addr_type = VNET_ADDR_ETHERMAC;
90 pkt.ack_freq = 0;
91 for (i = 0; i < 6; i++)
92 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
93 if (vio_version_after(vio, 1, 3)) {
94 if (port->rmtu) {
95 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
96 pkt.mtu = port->rmtu;
97 } else {
98 port->rmtu = VNET_MAXPACKET;
99 pkt.mtu = port->rmtu;
100 }
101 if (vio_version_after_eq(vio, 1, 6))
102 pkt.options = VIO_TX_DRING;
103 } else if (vio_version_before(vio, 1, 3)) {
104 pkt.mtu = framelen;
105 } else { /* v1.3 */
106 pkt.mtu = framelen + VLAN_HLEN;
107 }
108
109 pkt.cflags = 0;
110 if (vio_version_after_eq(vio, 1, 7) && port->tso) {
111 pkt.cflags |= VNET_LSO_IPV4_CAPAB;
112 if (!port->tsolen)
113 port->tsolen = VNET_MAXTSO;
114 pkt.ipv4_lso_maxlen = port->tsolen;
115 }
116
117 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
118
119 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
120 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
121 "cflags[0x%04x] lso_max[%u]\n",
122 pkt.xfer_mode, pkt.addr_type,
123 (unsigned long long)pkt.addr,
124 pkt.ack_freq, pkt.plnk_updt, pkt.options,
125 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
126
127 return vio_ldc_send(vio, &pkt, sizeof(pkt));
128 }
129 EXPORT_SYMBOL_GPL(sunvnet_send_attr_common);
130
131 static int handle_attr_info(struct vio_driver_state *vio,
132 struct vio_net_attr_info *pkt)
133 {
134 struct vnet_port *port = to_vnet_port(vio);
135 u64 localmtu;
136 u8 xfer_mode;
137
138 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
139 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
140 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
141 pkt->xfer_mode, pkt->addr_type,
142 (unsigned long long)pkt->addr,
143 pkt->ack_freq, pkt->plnk_updt, pkt->options,
144 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
145 pkt->ipv4_lso_maxlen);
146
147 pkt->tag.sid = vio_send_sid(vio);
148
149 xfer_mode = pkt->xfer_mode;
150 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
151 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
152 xfer_mode = VIO_NEW_DRING_MODE;
153
154 /* MTU negotiation:
155 * < v1.3 - ETH_FRAME_LEN exactly
156 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
157 * pkt->mtu for ACK
158 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
159 */
160 if (vio_version_before(vio, 1, 3)) {
161 localmtu = ETH_FRAME_LEN;
162 } else if (vio_version_after(vio, 1, 3)) {
163 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
164 localmtu = min(pkt->mtu, localmtu);
165 pkt->mtu = localmtu;
166 } else { /* v1.3 */
167 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
168 }
169 port->rmtu = localmtu;
170
171 /* LSO negotiation */
172 if (vio_version_after_eq(vio, 1, 7))
173 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
174 else
175 port->tso = false;
176 if (port->tso) {
177 if (!port->tsolen)
178 port->tsolen = VNET_MAXTSO;
179 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
180 if (port->tsolen < VNET_MINTSO) {
181 port->tso = false;
182 port->tsolen = 0;
183 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
184 }
185 pkt->ipv4_lso_maxlen = port->tsolen;
186 } else {
187 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
188 pkt->ipv4_lso_maxlen = 0;
189 port->tsolen = 0;
190 }
191
192 /* for version >= 1.6, ACK packet mode we support */
193 if (vio_version_after_eq(vio, 1, 6)) {
194 pkt->xfer_mode = VIO_NEW_DRING_MODE;
195 pkt->options = VIO_TX_DRING;
196 }
197
198 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
199 pkt->addr_type != VNET_ADDR_ETHERMAC ||
200 pkt->mtu != localmtu) {
201 viodbg(HS, "SEND NET ATTR NACK\n");
202
203 pkt->tag.stype = VIO_SUBTYPE_NACK;
204
205 (void)vio_ldc_send(vio, pkt, sizeof(*pkt));
206
207 return -ECONNRESET;
208 }
209
210 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
211 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
212 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
213 pkt->xfer_mode, pkt->addr_type,
214 (unsigned long long)pkt->addr,
215 pkt->ack_freq, pkt->plnk_updt, pkt->options,
216 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
217 pkt->ipv4_lso_maxlen);
218
219 pkt->tag.stype = VIO_SUBTYPE_ACK;
220
221 return vio_ldc_send(vio, pkt, sizeof(*pkt));
222 }
223
224 static int handle_attr_ack(struct vio_driver_state *vio,
225 struct vio_net_attr_info *pkt)
226 {
227 viodbg(HS, "GOT NET ATTR ACK\n");
228
229 return 0;
230 }
231
232 static int handle_attr_nack(struct vio_driver_state *vio,
233 struct vio_net_attr_info *pkt)
234 {
235 viodbg(HS, "GOT NET ATTR NACK\n");
236
237 return -ECONNRESET;
238 }
239
240 int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg)
241 {
242 struct vio_net_attr_info *pkt = arg;
243
244 switch (pkt->tag.stype) {
245 case VIO_SUBTYPE_INFO:
246 return handle_attr_info(vio, pkt);
247
248 case VIO_SUBTYPE_ACK:
249 return handle_attr_ack(vio, pkt);
250
251 case VIO_SUBTYPE_NACK:
252 return handle_attr_nack(vio, pkt);
253
254 default:
255 return -ECONNRESET;
256 }
257 }
258 EXPORT_SYMBOL_GPL(sunvnet_handle_attr_common);
259
260 void sunvnet_handshake_complete_common(struct vio_driver_state *vio)
261 {
262 struct vio_dring_state *dr;
263
264 dr = &vio->drings[VIO_DRIVER_RX_RING];
265 dr->rcv_nxt = 1;
266 dr->snd_nxt = 1;
267
268 dr = &vio->drings[VIO_DRIVER_TX_RING];
269 dr->rcv_nxt = 1;
270 dr->snd_nxt = 1;
271 }
272 EXPORT_SYMBOL_GPL(sunvnet_handshake_complete_common);
273
274 /* The hypervisor interface that implements copying to/from imported
275 * memory from another domain requires that copies are done to 8-byte
276 * aligned buffers, and that the lengths of such copies are also 8-byte
277 * multiples.
278 *
279 * So we align skb->data to an 8-byte multiple and pad-out the data
280 * area so we can round the copy length up to the next multiple of
281 * 8 for the copy.
282 *
283 * The transmitter puts the actual start of the packet 6 bytes into
284 * the buffer it sends over, so that the IP headers after the ethernet
285 * header are aligned properly. These 6 bytes are not in the descriptor
286 * length, they are simply implied. This offset is represented using
287 * the VNET_PACKET_SKIP macro.
288 */
289 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
290 unsigned int len)
291 {
292 struct sk_buff *skb;
293 unsigned long addr, off;
294
295 skb = netdev_alloc_skb(dev, len + VNET_PACKET_SKIP + 8 + 8);
296 if (unlikely(!skb))
297 return NULL;
298
299 addr = (unsigned long)skb->data;
300 off = ((addr + 7UL) & ~7UL) - addr;
301 if (off)
302 skb_reserve(skb, off);
303
304 return skb;
305 }
306
307 static inline void vnet_fullcsum_ipv4(struct sk_buff *skb)
308 {
309 struct iphdr *iph = ip_hdr(skb);
310 int offset = skb_transport_offset(skb);
311
312 if (skb->protocol != htons(ETH_P_IP))
313 return;
314 if (iph->protocol != IPPROTO_TCP &&
315 iph->protocol != IPPROTO_UDP)
316 return;
317 skb->ip_summed = CHECKSUM_NONE;
318 skb->csum_level = 1;
319 skb->csum = 0;
320 if (iph->protocol == IPPROTO_TCP) {
321 struct tcphdr *ptcp = tcp_hdr(skb);
322
323 ptcp->check = 0;
324 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
325 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
326 skb->len - offset, IPPROTO_TCP,
327 skb->csum);
328 } else if (iph->protocol == IPPROTO_UDP) {
329 struct udphdr *pudp = udp_hdr(skb);
330
331 pudp->check = 0;
332 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
333 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
334 skb->len - offset, IPPROTO_UDP,
335 skb->csum);
336 }
337 }
338
339 #if IS_ENABLED(CONFIG_IPV6)
340 static inline void vnet_fullcsum_ipv6(struct sk_buff *skb)
341 {
342 struct ipv6hdr *ip6h = ipv6_hdr(skb);
343 int offset = skb_transport_offset(skb);
344
345 if (skb->protocol != htons(ETH_P_IPV6))
346 return;
347 if (ip6h->nexthdr != IPPROTO_TCP &&
348 ip6h->nexthdr != IPPROTO_UDP)
349 return;
350 skb->ip_summed = CHECKSUM_NONE;
351 skb->csum_level = 1;
352 skb->csum = 0;
353 if (ip6h->nexthdr == IPPROTO_TCP) {
354 struct tcphdr *ptcp = tcp_hdr(skb);
355
356 ptcp->check = 0;
357 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
358 ptcp->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
359 skb->len - offset, IPPROTO_TCP,
360 skb->csum);
361 } else if (ip6h->nexthdr == IPPROTO_UDP) {
362 struct udphdr *pudp = udp_hdr(skb);
363
364 pudp->check = 0;
365 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
366 pudp->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
367 skb->len - offset, IPPROTO_UDP,
368 skb->csum);
369 }
370 }
371 #endif
372
373 static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
374 {
375 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
376 unsigned int len = desc->size;
377 unsigned int copy_len;
378 struct sk_buff *skb;
379 int maxlen;
380 int err;
381
382 err = -EMSGSIZE;
383 if (port->tso && port->tsolen > port->rmtu)
384 maxlen = port->tsolen;
385 else
386 maxlen = port->rmtu;
387 if (unlikely(len < ETH_ZLEN || len > maxlen)) {
388 dev->stats.rx_length_errors++;
389 goto out_dropped;
390 }
391
392 skb = alloc_and_align_skb(dev, len);
393 err = -ENOMEM;
394 if (unlikely(!skb)) {
395 dev->stats.rx_missed_errors++;
396 goto out_dropped;
397 }
398
399 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
400 skb_put(skb, copy_len);
401 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
402 skb->data, copy_len, 0,
403 desc->cookies, desc->ncookies);
404 if (unlikely(err < 0)) {
405 dev->stats.rx_frame_errors++;
406 goto out_free_skb;
407 }
408
409 skb_pull(skb, VNET_PACKET_SKIP);
410 skb_trim(skb, len);
411 skb->protocol = eth_type_trans(skb, dev);
412
413 if (vio_version_after_eq(&port->vio, 1, 8)) {
414 struct vio_net_dext *dext = vio_net_ext(desc);
415
416 skb_reset_network_header(skb);
417
418 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
419 if (skb->protocol == ETH_P_IP) {
420 struct iphdr *iph = ip_hdr(skb);
421
422 iph->check = 0;
423 ip_send_check(iph);
424 }
425 }
426 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
427 skb->ip_summed == CHECKSUM_NONE) {
428 if (skb->protocol == htons(ETH_P_IP)) {
429 struct iphdr *iph = ip_hdr(skb);
430 int ihl = iph->ihl * 4;
431
432 skb_set_transport_header(skb, ihl);
433 vnet_fullcsum_ipv4(skb);
434 #if IS_ENABLED(CONFIG_IPV6)
435 } else if (skb->protocol == htons(ETH_P_IPV6)) {
436 skb_set_transport_header(skb,
437 sizeof(struct ipv6hdr));
438 vnet_fullcsum_ipv6(skb);
439 #endif
440 }
441 }
442 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
443 skb->ip_summed = CHECKSUM_PARTIAL;
444 skb->csum_level = 0;
445 if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
446 skb->csum_level = 1;
447 }
448 }
449
450 skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
451
452 if (unlikely(is_multicast_ether_addr(eth_hdr(skb)->h_dest)))
453 dev->stats.multicast++;
454 dev->stats.rx_packets++;
455 dev->stats.rx_bytes += len;
456 port->stats.rx_packets++;
457 port->stats.rx_bytes += len;
458 napi_gro_receive(&port->napi, skb);
459 return 0;
460
461 out_free_skb:
462 kfree_skb(skb);
463
464 out_dropped:
465 dev->stats.rx_dropped++;
466 return err;
467 }
468
469 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
470 u32 start, u32 end, u8 vio_dring_state)
471 {
472 struct vio_dring_data hdr = {
473 .tag = {
474 .type = VIO_TYPE_DATA,
475 .stype = VIO_SUBTYPE_ACK,
476 .stype_env = VIO_DRING_DATA,
477 .sid = vio_send_sid(&port->vio),
478 },
479 .dring_ident = dr->ident,
480 .start_idx = start,
481 .end_idx = end,
482 .state = vio_dring_state,
483 };
484 int err, delay;
485 int retries = 0;
486
487 hdr.seq = dr->snd_nxt;
488 delay = 1;
489 do {
490 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
491 if (err > 0) {
492 dr->snd_nxt++;
493 break;
494 }
495 udelay(delay);
496 if ((delay <<= 1) > 128)
497 delay = 128;
498 if (retries++ > VNET_MAX_RETRIES) {
499 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
500 port->raddr[0], port->raddr[1],
501 port->raddr[2], port->raddr[3],
502 port->raddr[4], port->raddr[5]);
503 break;
504 }
505 } while (err == -EAGAIN);
506
507 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
508 port->stop_rx_idx = end;
509 port->stop_rx = true;
510 } else {
511 port->stop_rx_idx = 0;
512 port->stop_rx = false;
513 }
514
515 return err;
516 }
517
518 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
519 struct vio_dring_state *dr,
520 u32 index)
521 {
522 struct vio_net_desc *desc = port->vio.desc_buf;
523 int err;
524
525 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
526 (index * dr->entry_size),
527 dr->cookies, dr->ncookies);
528 if (err < 0)
529 return ERR_PTR(err);
530
531 return desc;
532 }
533
534 static int put_rx_desc(struct vnet_port *port,
535 struct vio_dring_state *dr,
536 struct vio_net_desc *desc,
537 u32 index)
538 {
539 int err;
540
541 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
542 (index * dr->entry_size),
543 dr->cookies, dr->ncookies);
544 if (err < 0)
545 return err;
546
547 return 0;
548 }
549
550 static int vnet_walk_rx_one(struct vnet_port *port,
551 struct vio_dring_state *dr,
552 u32 index, int *needs_ack)
553 {
554 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
555 struct vio_driver_state *vio = &port->vio;
556 int err;
557
558 BUG_ON(!desc);
559 if (IS_ERR(desc))
560 return PTR_ERR(desc);
561
562 if (desc->hdr.state != VIO_DESC_READY)
563 return 1;
564
565 dma_rmb();
566
567 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
568 desc->hdr.state, desc->hdr.ack,
569 desc->size, desc->ncookies,
570 desc->cookies[0].cookie_addr,
571 desc->cookies[0].cookie_size);
572
573 err = vnet_rx_one(port, desc);
574 if (err == -ECONNRESET)
575 return err;
576 trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
577 index, desc->hdr.ack);
578 desc->hdr.state = VIO_DESC_DONE;
579 err = put_rx_desc(port, dr, desc, index);
580 if (err < 0)
581 return err;
582 *needs_ack = desc->hdr.ack;
583 return 0;
584 }
585
586 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
587 u32 start, u32 end, int *npkts, int budget)
588 {
589 struct vio_driver_state *vio = &port->vio;
590 int ack_start = -1, ack_end = -1;
591 bool send_ack = true;
592
593 end = (end == (u32)-1) ? vio_dring_prev(dr, start)
594 : vio_dring_next(dr, end);
595
596 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
597
598 while (start != end) {
599 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
600
601 if (err == -ECONNRESET)
602 return err;
603 if (err != 0)
604 break;
605 (*npkts)++;
606 if (ack_start == -1)
607 ack_start = start;
608 ack_end = start;
609 start = vio_dring_next(dr, start);
610 if (ack && start != end) {
611 err = vnet_send_ack(port, dr, ack_start, ack_end,
612 VIO_DRING_ACTIVE);
613 if (err == -ECONNRESET)
614 return err;
615 ack_start = -1;
616 }
617 if ((*npkts) >= budget) {
618 send_ack = false;
619 break;
620 }
621 }
622 if (unlikely(ack_start == -1)) {
623 ack_end = vio_dring_prev(dr, start);
624 ack_start = ack_end;
625 }
626 if (send_ack) {
627 port->napi_resume = false;
628 trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
629 port->vio._peer_sid,
630 ack_end, *npkts);
631 return vnet_send_ack(port, dr, ack_start, ack_end,
632 VIO_DRING_STOPPED);
633 } else {
634 trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
635 port->vio._peer_sid,
636 ack_end, *npkts);
637 port->napi_resume = true;
638 port->napi_stop_idx = ack_end;
639 return 1;
640 }
641 }
642
643 static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
644 int budget)
645 {
646 struct vio_dring_data *pkt = msgbuf;
647 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
648 struct vio_driver_state *vio = &port->vio;
649
650 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
651 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
652
653 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
654 return 0;
655 if (unlikely(pkt->seq != dr->rcv_nxt)) {
656 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
657 pkt->seq, dr->rcv_nxt);
658 return 0;
659 }
660
661 if (!port->napi_resume)
662 dr->rcv_nxt++;
663
664 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
665
666 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
667 npkts, budget);
668 }
669
670 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
671 {
672 u32 idx = dr->cons;
673 int found = 0;
674
675 while (idx != dr->prod) {
676 if (idx == end) {
677 found = 1;
678 break;
679 }
680 idx = vio_dring_next(dr, idx);
681 }
682 return found;
683 }
684
685 static int vnet_ack(struct vnet_port *port, void *msgbuf)
686 {
687 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
688 struct vio_dring_data *pkt = msgbuf;
689 struct net_device *dev;
690 u32 end;
691 struct vio_net_desc *desc;
692 struct netdev_queue *txq;
693
694 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
695 return 0;
696
697 end = pkt->end_idx;
698 dev = VNET_PORT_TO_NET_DEVICE(port);
699 netif_tx_lock(dev);
700 if (unlikely(!idx_is_pending(dr, end))) {
701 netif_tx_unlock(dev);
702 return 0;
703 }
704
705 /* sync for race conditions with vnet_start_xmit() and tell xmit it
706 * is time to send a trigger.
707 */
708 trace_vnet_rx_stopped_ack(port->vio._local_sid,
709 port->vio._peer_sid, end);
710 dr->cons = vio_dring_next(dr, end);
711 desc = vio_dring_entry(dr, dr->cons);
712 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
713 /* vnet_start_xmit() just populated this dring but missed
714 * sending the "start" LDC message to the consumer.
715 * Send a "start" trigger on its behalf.
716 */
717 if (__vnet_tx_trigger(port, dr->cons) > 0)
718 port->start_cons = false;
719 else
720 port->start_cons = true;
721 } else {
722 port->start_cons = true;
723 }
724 netif_tx_unlock(dev);
725
726 txq = netdev_get_tx_queue(dev, port->q_index);
727 if (unlikely(netif_tx_queue_stopped(txq) &&
728 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
729 return 1;
730
731 return 0;
732 }
733
734 static int vnet_nack(struct vnet_port *port, void *msgbuf)
735 {
736 /* XXX just reset or similar XXX */
737 return 0;
738 }
739
740 static int handle_mcast(struct vnet_port *port, void *msgbuf)
741 {
742 struct vio_net_mcast_info *pkt = msgbuf;
743 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
744
745 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
746 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
747 dev->name,
748 pkt->tag.type,
749 pkt->tag.stype,
750 pkt->tag.stype_env,
751 pkt->tag.sid);
752
753 return 0;
754 }
755
756 /* If the queue is stopped, wake it up so that we'll
757 * send out another START message at the next TX.
758 */
759 static void maybe_tx_wakeup(struct vnet_port *port)
760 {
761 struct netdev_queue *txq;
762
763 txq = netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
764 port->q_index);
765 __netif_tx_lock(txq, smp_processor_id());
766 if (likely(netif_tx_queue_stopped(txq)))
767 netif_tx_wake_queue(txq);
768 __netif_tx_unlock(txq);
769 }
770
771 bool sunvnet_port_is_up_common(struct vnet_port *vnet)
772 {
773 struct vio_driver_state *vio = &vnet->vio;
774
775 return !!(vio->hs_state & VIO_HS_COMPLETE);
776 }
777 EXPORT_SYMBOL_GPL(sunvnet_port_is_up_common);
778
779 static int vnet_event_napi(struct vnet_port *port, int budget)
780 {
781 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
782 struct vio_driver_state *vio = &port->vio;
783 int tx_wakeup, err;
784 int npkts = 0;
785
786 /* we don't expect any other bits */
787 BUG_ON(port->rx_event & ~(LDC_EVENT_DATA_READY |
788 LDC_EVENT_RESET |
789 LDC_EVENT_UP));
790
791 /* RESET takes precedent over any other event */
792 if (port->rx_event & LDC_EVENT_RESET) {
793 /* a link went down */
794
795 if (port->vsw == 1) {
796 netif_tx_stop_all_queues(dev);
797 netif_carrier_off(dev);
798 }
799
800 vio_link_state_change(vio, LDC_EVENT_RESET);
801 vnet_port_reset(port);
802 vio_port_up(vio);
803
804 /* If the device is running but its tx queue was
805 * stopped (due to flow control), restart it.
806 * This is necessary since vnet_port_reset()
807 * clears the tx drings and thus we may never get
808 * back a VIO_TYPE_DATA ACK packet - which is
809 * the normal mechanism to restart the tx queue.
810 */
811 if (netif_running(dev))
812 maybe_tx_wakeup(port);
813
814 port->rx_event = 0;
815 port->stats.event_reset++;
816 return 0;
817 }
818
819 if (port->rx_event & LDC_EVENT_UP) {
820 /* a link came up */
821
822 if (port->vsw == 1) {
823 netif_carrier_on(port->dev);
824 netif_tx_start_all_queues(port->dev);
825 }
826
827 vio_link_state_change(vio, LDC_EVENT_UP);
828 port->rx_event = 0;
829 port->stats.event_up++;
830 return 0;
831 }
832
833 err = 0;
834 tx_wakeup = 0;
835 while (1) {
836 union {
837 struct vio_msg_tag tag;
838 u64 raw[8];
839 } msgbuf;
840
841 if (port->napi_resume) {
842 struct vio_dring_data *pkt =
843 (struct vio_dring_data *)&msgbuf;
844 struct vio_dring_state *dr =
845 &port->vio.drings[VIO_DRIVER_RX_RING];
846
847 pkt->tag.type = VIO_TYPE_DATA;
848 pkt->tag.stype = VIO_SUBTYPE_INFO;
849 pkt->tag.stype_env = VIO_DRING_DATA;
850 pkt->seq = dr->rcv_nxt;
851 pkt->start_idx = vio_dring_next(dr,
852 port->napi_stop_idx);
853 pkt->end_idx = -1;
854 } else {
855 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
856 if (unlikely(err < 0)) {
857 if (err == -ECONNRESET)
858 vio_conn_reset(vio);
859 break;
860 }
861 if (err == 0)
862 break;
863 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
864 msgbuf.tag.type,
865 msgbuf.tag.stype,
866 msgbuf.tag.stype_env,
867 msgbuf.tag.sid);
868 err = vio_validate_sid(vio, &msgbuf.tag);
869 if (err < 0)
870 break;
871 }
872
873 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
874 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
875 if (!sunvnet_port_is_up_common(port)) {
876 /* failures like handshake_failure()
877 * may have cleaned up dring, but
878 * NAPI polling may bring us here.
879 */
880 err = -ECONNRESET;
881 break;
882 }
883 err = vnet_rx(port, &msgbuf, &npkts, budget);
884 if (npkts >= budget)
885 break;
886 if (npkts == 0)
887 break;
888 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
889 err = vnet_ack(port, &msgbuf);
890 if (err > 0)
891 tx_wakeup |= err;
892 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
893 err = vnet_nack(port, &msgbuf);
894 }
895 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
896 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
897 err = handle_mcast(port, &msgbuf);
898 else
899 err = vio_control_pkt_engine(vio, &msgbuf);
900 if (err)
901 break;
902 } else {
903 err = vnet_handle_unknown(port, &msgbuf);
904 }
905 if (err == -ECONNRESET)
906 break;
907 }
908 if (unlikely(tx_wakeup && err != -ECONNRESET))
909 maybe_tx_wakeup(port);
910 return npkts;
911 }
912
913 int sunvnet_poll_common(struct napi_struct *napi, int budget)
914 {
915 struct vnet_port *port = container_of(napi, struct vnet_port, napi);
916 struct vio_driver_state *vio = &port->vio;
917 int processed = vnet_event_napi(port, budget);
918
919 if (processed < budget) {
920 napi_complete_done(napi, processed);
921 port->rx_event &= ~LDC_EVENT_DATA_READY;
922 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
923 }
924 return processed;
925 }
926 EXPORT_SYMBOL_GPL(sunvnet_poll_common);
927
928 void sunvnet_event_common(void *arg, int event)
929 {
930 struct vnet_port *port = arg;
931 struct vio_driver_state *vio = &port->vio;
932
933 port->rx_event |= event;
934 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
935 napi_schedule(&port->napi);
936 }
937 EXPORT_SYMBOL_GPL(sunvnet_event_common);
938
939 static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
940 {
941 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
942 struct vio_dring_data hdr = {
943 .tag = {
944 .type = VIO_TYPE_DATA,
945 .stype = VIO_SUBTYPE_INFO,
946 .stype_env = VIO_DRING_DATA,
947 .sid = vio_send_sid(&port->vio),
948 },
949 .dring_ident = dr->ident,
950 .start_idx = start,
951 .end_idx = (u32)-1,
952 };
953 int err, delay;
954 int retries = 0;
955
956 if (port->stop_rx) {
957 trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
958 port->vio._peer_sid,
959 port->stop_rx_idx, -1);
960 err = vnet_send_ack(port,
961 &port->vio.drings[VIO_DRIVER_RX_RING],
962 port->stop_rx_idx, -1,
963 VIO_DRING_STOPPED);
964 if (err <= 0)
965 return err;
966 }
967
968 hdr.seq = dr->snd_nxt;
969 delay = 1;
970 do {
971 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
972 if (err > 0) {
973 dr->snd_nxt++;
974 break;
975 }
976 udelay(delay);
977 if ((delay <<= 1) > 128)
978 delay = 128;
979 if (retries++ > VNET_MAX_RETRIES)
980 break;
981 } while (err == -EAGAIN);
982 trace_vnet_tx_trigger(port->vio._local_sid,
983 port->vio._peer_sid, start, err);
984
985 return err;
986 }
987
988 static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
989 unsigned *pending)
990 {
991 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
992 struct sk_buff *skb = NULL;
993 int i, txi;
994
995 *pending = 0;
996
997 txi = dr->prod;
998 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
999 struct vio_net_desc *d;
1000
1001 --txi;
1002 if (txi < 0)
1003 txi = VNET_TX_RING_SIZE - 1;
1004
1005 d = vio_dring_entry(dr, txi);
1006
1007 if (d->hdr.state == VIO_DESC_READY) {
1008 (*pending)++;
1009 continue;
1010 }
1011 if (port->tx_bufs[txi].skb) {
1012 if (d->hdr.state != VIO_DESC_DONE)
1013 pr_notice("invalid ring buffer state %d\n",
1014 d->hdr.state);
1015 BUG_ON(port->tx_bufs[txi].skb->next);
1016
1017 port->tx_bufs[txi].skb->next = skb;
1018 skb = port->tx_bufs[txi].skb;
1019 port->tx_bufs[txi].skb = NULL;
1020
1021 ldc_unmap(port->vio.lp,
1022 port->tx_bufs[txi].cookies,
1023 port->tx_bufs[txi].ncookies);
1024 } else if (d->hdr.state == VIO_DESC_FREE) {
1025 break;
1026 }
1027 d->hdr.state = VIO_DESC_FREE;
1028 }
1029 return skb;
1030 }
1031
1032 static inline void vnet_free_skbs(struct sk_buff *skb)
1033 {
1034 struct sk_buff *next;
1035
1036 while (skb) {
1037 next = skb->next;
1038 skb->next = NULL;
1039 dev_kfree_skb(skb);
1040 skb = next;
1041 }
1042 }
1043
1044 void sunvnet_clean_timer_expire_common(struct timer_list *t)
1045 {
1046 struct vnet_port *port = from_timer(port, t, clean_timer);
1047 struct sk_buff *freeskbs;
1048 unsigned pending;
1049
1050 netif_tx_lock(VNET_PORT_TO_NET_DEVICE(port));
1051 freeskbs = vnet_clean_tx_ring(port, &pending);
1052 netif_tx_unlock(VNET_PORT_TO_NET_DEVICE(port));
1053
1054 vnet_free_skbs(freeskbs);
1055
1056 if (pending)
1057 (void)mod_timer(&port->clean_timer,
1058 jiffies + VNET_CLEAN_TIMEOUT);
1059 else
1060 del_timer(&port->clean_timer);
1061 }
1062 EXPORT_SYMBOL_GPL(sunvnet_clean_timer_expire_common);
1063
1064 static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
1065 struct ldc_trans_cookie *cookies, int ncookies,
1066 unsigned int map_perm)
1067 {
1068 int i, nc, err, blen;
1069
1070 /* header */
1071 blen = skb_headlen(skb);
1072 if (blen < ETH_ZLEN)
1073 blen = ETH_ZLEN;
1074 blen += VNET_PACKET_SKIP;
1075 blen += 8 - (blen & 7);
1076
1077 err = ldc_map_single(lp, skb->data - VNET_PACKET_SKIP, blen, cookies,
1078 ncookies, map_perm);
1079 if (err < 0)
1080 return err;
1081 nc = err;
1082
1083 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1084 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1085 u8 *vaddr;
1086
1087 if (nc < ncookies) {
1088 vaddr = kmap_atomic(skb_frag_page(f));
1089 blen = skb_frag_size(f);
1090 blen += 8 - (blen & 7);
1091 err = ldc_map_single(lp, vaddr + skb_frag_off(f),
1092 blen, cookies + nc, ncookies - nc,
1093 map_perm);
1094 kunmap_atomic(vaddr);
1095 } else {
1096 err = -EMSGSIZE;
1097 }
1098
1099 if (err < 0) {
1100 ldc_unmap(lp, cookies, nc);
1101 return err;
1102 }
1103 nc += err;
1104 }
1105 return nc;
1106 }
1107
1108 static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
1109 {
1110 struct sk_buff *nskb;
1111 int i, len, pad, docopy;
1112
1113 len = skb->len;
1114 pad = 0;
1115 if (len < ETH_ZLEN) {
1116 pad += ETH_ZLEN - skb->len;
1117 len += pad;
1118 }
1119 len += VNET_PACKET_SKIP;
1120 pad += 8 - (len & 7);
1121
1122 /* make sure we have enough cookies and alignment in every frag */
1123 docopy = skb_shinfo(skb)->nr_frags >= ncookies;
1124 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1125 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1126
1127 docopy |= skb_frag_off(f) & 7;
1128 }
1129 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
1130 skb_tailroom(skb) < pad ||
1131 skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
1132 int start = 0, offset;
1133 __wsum csum;
1134
1135 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
1136 nskb = alloc_and_align_skb(skb->dev, len);
1137 if (!nskb) {
1138 dev_kfree_skb(skb);
1139 return NULL;
1140 }
1141 skb_reserve(nskb, VNET_PACKET_SKIP);
1142
1143 nskb->protocol = skb->protocol;
1144 offset = skb_mac_header(skb) - skb->data;
1145 skb_set_mac_header(nskb, offset);
1146 offset = skb_network_header(skb) - skb->data;
1147 skb_set_network_header(nskb, offset);
1148 offset = skb_transport_header(skb) - skb->data;
1149 skb_set_transport_header(nskb, offset);
1150
1151 offset = 0;
1152 nskb->csum_offset = skb->csum_offset;
1153 nskb->ip_summed = skb->ip_summed;
1154
1155 if (skb->ip_summed == CHECKSUM_PARTIAL)
1156 start = skb_checksum_start_offset(skb);
1157 if (start) {
1158 int offset = start + nskb->csum_offset;
1159
1160 /* copy the headers, no csum here */
1161 if (skb_copy_bits(skb, 0, nskb->data, start)) {
1162 dev_kfree_skb(nskb);
1163 dev_kfree_skb(skb);
1164 return NULL;
1165 }
1166
1167 /* copy the rest, with csum calculation */
1168 *(__sum16 *)(skb->data + offset) = 0;
1169 csum = skb_copy_and_csum_bits(skb, start,
1170 nskb->data + start,
1171 skb->len - start, 0);
1172
1173 /* add in the header checksums */
1174 if (skb->protocol == htons(ETH_P_IP)) {
1175 struct iphdr *iph = ip_hdr(nskb);
1176
1177 if (iph->protocol == IPPROTO_TCP ||
1178 iph->protocol == IPPROTO_UDP) {
1179 csum = csum_tcpudp_magic(iph->saddr,
1180 iph->daddr,
1181 skb->len - start,
1182 iph->protocol,
1183 csum);
1184 }
1185 } else if (skb->protocol == htons(ETH_P_IPV6)) {
1186 struct ipv6hdr *ip6h = ipv6_hdr(nskb);
1187
1188 if (ip6h->nexthdr == IPPROTO_TCP ||
1189 ip6h->nexthdr == IPPROTO_UDP) {
1190 csum = csum_ipv6_magic(&ip6h->saddr,
1191 &ip6h->daddr,
1192 skb->len - start,
1193 ip6h->nexthdr,
1194 csum);
1195 }
1196 }
1197
1198 /* save the final result */
1199 *(__sum16 *)(nskb->data + offset) = csum;
1200
1201 nskb->ip_summed = CHECKSUM_NONE;
1202 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
1203 dev_kfree_skb(nskb);
1204 dev_kfree_skb(skb);
1205 return NULL;
1206 }
1207 (void)skb_put(nskb, skb->len);
1208 if (skb_is_gso(skb)) {
1209 skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
1210 skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
1211 }
1212 nskb->queue_mapping = skb->queue_mapping;
1213 dev_kfree_skb(skb);
1214 skb = nskb;
1215 }
1216 return skb;
1217 }
1218
1219 static netdev_tx_t
1220 vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb,
1221 struct vnet_port *(*vnet_tx_port)
1222 (struct sk_buff *, struct net_device *))
1223 {
1224 struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
1225 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1226 struct sk_buff *segs, *curr, *next;
1227 int maclen, datalen;
1228 int status;
1229 int gso_size, gso_type, gso_segs;
1230 int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1231 int proto = IPPROTO_IP;
1232
1233 if (skb->protocol == htons(ETH_P_IP))
1234 proto = ip_hdr(skb)->protocol;
1235 else if (skb->protocol == htons(ETH_P_IPV6))
1236 proto = ipv6_hdr(skb)->nexthdr;
1237
1238 if (proto == IPPROTO_TCP) {
1239 hlen += tcp_hdr(skb)->doff * 4;
1240 } else if (proto == IPPROTO_UDP) {
1241 hlen += sizeof(struct udphdr);
1242 } else {
1243 pr_err("vnet_handle_offloads GSO with unknown transport "
1244 "protocol %d tproto %d\n", skb->protocol, proto);
1245 hlen = 128; /* XXX */
1246 }
1247 datalen = port->tsolen - hlen;
1248
1249 gso_size = skb_shinfo(skb)->gso_size;
1250 gso_type = skb_shinfo(skb)->gso_type;
1251 gso_segs = skb_shinfo(skb)->gso_segs;
1252
1253 if (port->tso && gso_size < datalen)
1254 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1255
1256 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1257 struct netdev_queue *txq;
1258
1259 txq = netdev_get_tx_queue(dev, port->q_index);
1260 netif_tx_stop_queue(txq);
1261 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1262 return NETDEV_TX_BUSY;
1263 netif_tx_wake_queue(txq);
1264 }
1265
1266 maclen = skb_network_header(skb) - skb_mac_header(skb);
1267 skb_pull(skb, maclen);
1268
1269 if (port->tso && gso_size < datalen) {
1270 if (skb_unclone(skb, GFP_ATOMIC))
1271 goto out_dropped;
1272
1273 /* segment to TSO size */
1274 skb_shinfo(skb)->gso_size = datalen;
1275 skb_shinfo(skb)->gso_segs = gso_segs;
1276 }
1277 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1278 if (IS_ERR(segs))
1279 goto out_dropped;
1280
1281 skb_push(skb, maclen);
1282 skb_reset_mac_header(skb);
1283
1284 status = 0;
1285 skb_list_walk_safe(segs, curr, next) {
1286 skb_mark_not_on_list(curr);
1287 if (port->tso && curr->len > dev->mtu) {
1288 skb_shinfo(curr)->gso_size = gso_size;
1289 skb_shinfo(curr)->gso_type = gso_type;
1290 skb_shinfo(curr)->gso_segs =
1291 DIV_ROUND_UP(curr->len - hlen, gso_size);
1292 } else {
1293 skb_shinfo(curr)->gso_size = 0;
1294 }
1295
1296 skb_push(curr, maclen);
1297 skb_reset_mac_header(curr);
1298 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1299 maclen);
1300 curr->csum_start = skb_transport_header(curr) - curr->head;
1301 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1302 curr->csum_offset = offsetof(struct tcphdr, check);
1303 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1304 curr->csum_offset = offsetof(struct udphdr, check);
1305
1306 if (!(status & NETDEV_TX_MASK))
1307 status = sunvnet_start_xmit_common(curr, dev,
1308 vnet_tx_port);
1309 if (status & NETDEV_TX_MASK)
1310 dev_kfree_skb_any(curr);
1311 }
1312
1313 if (!(status & NETDEV_TX_MASK))
1314 dev_kfree_skb_any(skb);
1315 return status;
1316 out_dropped:
1317 dev->stats.tx_dropped++;
1318 dev_kfree_skb_any(skb);
1319 return NETDEV_TX_OK;
1320 }
1321
1322 netdev_tx_t
1323 sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
1324 struct vnet_port *(*vnet_tx_port)
1325 (struct sk_buff *, struct net_device *))
1326 {
1327 struct vnet_port *port = NULL;
1328 struct vio_dring_state *dr;
1329 struct vio_net_desc *d;
1330 unsigned int len;
1331 struct sk_buff *freeskbs = NULL;
1332 int i, err, txi;
1333 unsigned pending = 0;
1334 struct netdev_queue *txq;
1335
1336 rcu_read_lock();
1337 port = vnet_tx_port(skb, dev);
1338 if (unlikely(!port))
1339 goto out_dropped;
1340
1341 if (skb_is_gso(skb) && skb->len > port->tsolen) {
1342 err = vnet_handle_offloads(port, skb, vnet_tx_port);
1343 rcu_read_unlock();
1344 return err;
1345 }
1346
1347 if (!skb_is_gso(skb) && skb->len > port->rmtu) {
1348 unsigned long localmtu = port->rmtu - ETH_HLEN;
1349
1350 if (vio_version_after_eq(&port->vio, 1, 3))
1351 localmtu -= VLAN_HLEN;
1352
1353 if (skb->protocol == htons(ETH_P_IP)) {
1354 struct flowi4 fl4;
1355 struct rtable *rt = NULL;
1356
1357 memset(&fl4, 0, sizeof(fl4));
1358 fl4.flowi4_oif = dev->ifindex;
1359 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
1360 fl4.daddr = ip_hdr(skb)->daddr;
1361 fl4.saddr = ip_hdr(skb)->saddr;
1362
1363 rt = ip_route_output_key(dev_net(dev), &fl4);
1364 if (!IS_ERR(rt)) {
1365 skb_dst_set(skb, &rt->dst);
1366 icmp_send(skb, ICMP_DEST_UNREACH,
1367 ICMP_FRAG_NEEDED,
1368 htonl(localmtu));
1369 }
1370 }
1371 #if IS_ENABLED(CONFIG_IPV6)
1372 else if (skb->protocol == htons(ETH_P_IPV6))
1373 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1374 #endif
1375 goto out_dropped;
1376 }
1377
1378 skb = vnet_skb_shape(skb, 2);
1379
1380 if (unlikely(!skb))
1381 goto out_dropped;
1382
1383 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1384 if (skb->protocol == htons(ETH_P_IP))
1385 vnet_fullcsum_ipv4(skb);
1386 #if IS_ENABLED(CONFIG_IPV6)
1387 else if (skb->protocol == htons(ETH_P_IPV6))
1388 vnet_fullcsum_ipv6(skb);
1389 #endif
1390 }
1391
1392 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1393 i = skb_get_queue_mapping(skb);
1394 txq = netdev_get_tx_queue(dev, i);
1395 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1396 if (!netif_tx_queue_stopped(txq)) {
1397 netif_tx_stop_queue(txq);
1398
1399 /* This is a hard error, log it. */
1400 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1401 dev->stats.tx_errors++;
1402 }
1403 rcu_read_unlock();
1404 return NETDEV_TX_BUSY;
1405 }
1406
1407 d = vio_dring_cur(dr);
1408
1409 txi = dr->prod;
1410
1411 freeskbs = vnet_clean_tx_ring(port, &pending);
1412
1413 BUG_ON(port->tx_bufs[txi].skb);
1414
1415 len = skb->len;
1416 if (len < ETH_ZLEN)
1417 len = ETH_ZLEN;
1418
1419 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1420 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1421 if (err < 0) {
1422 netdev_info(dev, "tx buffer map error %d\n", err);
1423 goto out_dropped;
1424 }
1425
1426 port->tx_bufs[txi].skb = skb;
1427 skb = NULL;
1428 port->tx_bufs[txi].ncookies = err;
1429
1430 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1431 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1432 * the protocol itself does not require it as long as the peer
1433 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1434 *
1435 * An ACK for every packet in the ring is expensive as the
1436 * sending of LDC messages is slow and affects performance.
1437 */
1438 d->hdr.ack = VIO_ACK_DISABLE;
1439 d->size = len;
1440 d->ncookies = port->tx_bufs[txi].ncookies;
1441 for (i = 0; i < d->ncookies; i++)
1442 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1443 if (vio_version_after_eq(&port->vio, 1, 7)) {
1444 struct vio_net_dext *dext = vio_net_ext(d);
1445
1446 memset(dext, 0, sizeof(*dext));
1447 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1448 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1449 ->gso_size;
1450 dext->flags |= VNET_PKT_IPV4_LSO;
1451 }
1452 if (vio_version_after_eq(&port->vio, 1, 8) &&
1453 !port->switch_port) {
1454 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1455 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1456 }
1457 }
1458
1459 /* This has to be a non-SMP write barrier because we are writing
1460 * to memory which is shared with the peer LDOM.
1461 */
1462 dma_wmb();
1463
1464 d->hdr.state = VIO_DESC_READY;
1465
1466 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1467 * to notify the consumer that some descriptors are READY.
1468 * After that "start" trigger, no additional triggers are needed until
1469 * a DRING_STOPPED is received from the consumer. The dr->cons field
1470 * (set up by vnet_ack()) has the value of the next dring index
1471 * that has not yet been ack-ed. We send a "start" trigger here
1472 * if, and only if, start_cons is true (reset it afterward). Conversely,
1473 * vnet_ack() should check if the dring corresponding to cons
1474 * is marked READY, but start_cons was false.
1475 * If so, vnet_ack() should send out the missed "start" trigger.
1476 *
1477 * Note that the dma_wmb() above makes sure the cookies et al. are
1478 * not globally visible before the VIO_DESC_READY, and that the
1479 * stores are ordered correctly by the compiler. The consumer will
1480 * not proceed until the VIO_DESC_READY is visible assuring that
1481 * the consumer does not observe anything related to descriptors
1482 * out of order. The HV trap from the LDC start trigger is the
1483 * producer to consumer announcement that work is available to the
1484 * consumer
1485 */
1486 if (!port->start_cons) { /* previous trigger suffices */
1487 trace_vnet_skip_tx_trigger(port->vio._local_sid,
1488 port->vio._peer_sid, dr->cons);
1489 goto ldc_start_done;
1490 }
1491
1492 err = __vnet_tx_trigger(port, dr->cons);
1493 if (unlikely(err < 0)) {
1494 netdev_info(dev, "TX trigger error %d\n", err);
1495 d->hdr.state = VIO_DESC_FREE;
1496 skb = port->tx_bufs[txi].skb;
1497 port->tx_bufs[txi].skb = NULL;
1498 dev->stats.tx_carrier_errors++;
1499 goto out_dropped;
1500 }
1501
1502 ldc_start_done:
1503 port->start_cons = false;
1504
1505 dev->stats.tx_packets++;
1506 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1507 port->stats.tx_packets++;
1508 port->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1509
1510 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1511 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1512 netif_tx_stop_queue(txq);
1513 smp_rmb();
1514 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1515 netif_tx_wake_queue(txq);
1516 }
1517
1518 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1519 rcu_read_unlock();
1520
1521 vnet_free_skbs(freeskbs);
1522
1523 return NETDEV_TX_OK;
1524
1525 out_dropped:
1526 if (pending)
1527 (void)mod_timer(&port->clean_timer,
1528 jiffies + VNET_CLEAN_TIMEOUT);
1529 else if (port)
1530 del_timer(&port->clean_timer);
1531 rcu_read_unlock();
1532 dev_kfree_skb(skb);
1533 vnet_free_skbs(freeskbs);
1534 dev->stats.tx_dropped++;
1535 return NETDEV_TX_OK;
1536 }
1537 EXPORT_SYMBOL_GPL(sunvnet_start_xmit_common);
1538
1539 void sunvnet_tx_timeout_common(struct net_device *dev, unsigned int txqueue)
1540 {
1541 /* XXX Implement me XXX */
1542 }
1543 EXPORT_SYMBOL_GPL(sunvnet_tx_timeout_common);
1544
1545 int sunvnet_open_common(struct net_device *dev)
1546 {
1547 netif_carrier_on(dev);
1548 netif_tx_start_all_queues(dev);
1549
1550 return 0;
1551 }
1552 EXPORT_SYMBOL_GPL(sunvnet_open_common);
1553
1554 int sunvnet_close_common(struct net_device *dev)
1555 {
1556 netif_tx_stop_all_queues(dev);
1557 netif_carrier_off(dev);
1558
1559 return 0;
1560 }
1561 EXPORT_SYMBOL_GPL(sunvnet_close_common);
1562
1563 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1564 {
1565 struct vnet_mcast_entry *m;
1566
1567 for (m = vp->mcast_list; m; m = m->next) {
1568 if (ether_addr_equal(m->addr, addr))
1569 return m;
1570 }
1571 return NULL;
1572 }
1573
1574 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1575 {
1576 struct netdev_hw_addr *ha;
1577
1578 netdev_for_each_mc_addr(ha, dev) {
1579 struct vnet_mcast_entry *m;
1580
1581 m = __vnet_mc_find(vp, ha->addr);
1582 if (m) {
1583 m->hit = 1;
1584 continue;
1585 }
1586
1587 if (!m) {
1588 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1589 if (!m)
1590 continue;
1591 memcpy(m->addr, ha->addr, ETH_ALEN);
1592 m->hit = 1;
1593
1594 m->next = vp->mcast_list;
1595 vp->mcast_list = m;
1596 }
1597 }
1598 }
1599
1600 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1601 {
1602 struct vio_net_mcast_info info;
1603 struct vnet_mcast_entry *m, **pp;
1604 int n_addrs;
1605
1606 memset(&info, 0, sizeof(info));
1607
1608 info.tag.type = VIO_TYPE_CTRL;
1609 info.tag.stype = VIO_SUBTYPE_INFO;
1610 info.tag.stype_env = VNET_MCAST_INFO;
1611 info.tag.sid = vio_send_sid(&port->vio);
1612 info.set = 1;
1613
1614 n_addrs = 0;
1615 for (m = vp->mcast_list; m; m = m->next) {
1616 if (m->sent)
1617 continue;
1618 m->sent = 1;
1619 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1620 m->addr, ETH_ALEN);
1621 if (++n_addrs == VNET_NUM_MCAST) {
1622 info.count = n_addrs;
1623
1624 (void)vio_ldc_send(&port->vio, &info,
1625 sizeof(info));
1626 n_addrs = 0;
1627 }
1628 }
1629 if (n_addrs) {
1630 info.count = n_addrs;
1631 (void)vio_ldc_send(&port->vio, &info, sizeof(info));
1632 }
1633
1634 info.set = 0;
1635
1636 n_addrs = 0;
1637 pp = &vp->mcast_list;
1638 while ((m = *pp) != NULL) {
1639 if (m->hit) {
1640 m->hit = 0;
1641 pp = &m->next;
1642 continue;
1643 }
1644
1645 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1646 m->addr, ETH_ALEN);
1647 if (++n_addrs == VNET_NUM_MCAST) {
1648 info.count = n_addrs;
1649 (void)vio_ldc_send(&port->vio, &info,
1650 sizeof(info));
1651 n_addrs = 0;
1652 }
1653
1654 *pp = m->next;
1655 kfree(m);
1656 }
1657 if (n_addrs) {
1658 info.count = n_addrs;
1659 (void)vio_ldc_send(&port->vio, &info, sizeof(info));
1660 }
1661 }
1662
1663 void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp)
1664 {
1665 struct vnet_port *port;
1666
1667 rcu_read_lock();
1668 list_for_each_entry_rcu(port, &vp->port_list, list) {
1669 if (port->switch_port) {
1670 __update_mc_list(vp, dev);
1671 __send_mc_list(vp, port);
1672 break;
1673 }
1674 }
1675 rcu_read_unlock();
1676 }
1677 EXPORT_SYMBOL_GPL(sunvnet_set_rx_mode_common);
1678
1679 int sunvnet_set_mac_addr_common(struct net_device *dev, void *p)
1680 {
1681 return -EINVAL;
1682 }
1683 EXPORT_SYMBOL_GPL(sunvnet_set_mac_addr_common);
1684
1685 void sunvnet_port_free_tx_bufs_common(struct vnet_port *port)
1686 {
1687 struct vio_dring_state *dr;
1688 int i;
1689
1690 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1691
1692 if (!dr->base)
1693 return;
1694
1695 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1696 struct vio_net_desc *d;
1697 void *skb = port->tx_bufs[i].skb;
1698
1699 if (!skb)
1700 continue;
1701
1702 d = vio_dring_entry(dr, i);
1703
1704 ldc_unmap(port->vio.lp,
1705 port->tx_bufs[i].cookies,
1706 port->tx_bufs[i].ncookies);
1707 dev_kfree_skb(skb);
1708 port->tx_bufs[i].skb = NULL;
1709 d->hdr.state = VIO_DESC_FREE;
1710 }
1711 ldc_free_exp_dring(port->vio.lp, dr->base,
1712 (dr->entry_size * dr->num_entries),
1713 dr->cookies, dr->ncookies);
1714 dr->base = NULL;
1715 dr->entry_size = 0;
1716 dr->num_entries = 0;
1717 dr->pending = 0;
1718 dr->ncookies = 0;
1719 }
1720 EXPORT_SYMBOL_GPL(sunvnet_port_free_tx_bufs_common);
1721
1722 void vnet_port_reset(struct vnet_port *port)
1723 {
1724 del_timer(&port->clean_timer);
1725 sunvnet_port_free_tx_bufs_common(port);
1726 port->rmtu = 0;
1727 port->tso = (port->vsw == 0); /* no tso in vsw, misbehaves in bridge */
1728 port->tsolen = 0;
1729 }
1730 EXPORT_SYMBOL_GPL(vnet_port_reset);
1731
1732 static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1733 {
1734 struct vio_dring_state *dr;
1735 unsigned long len, elen;
1736 int i, err, ncookies;
1737 void *dring;
1738
1739 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1740
1741 elen = sizeof(struct vio_net_desc) +
1742 sizeof(struct ldc_trans_cookie) * 2;
1743 if (vio_version_after_eq(&port->vio, 1, 7))
1744 elen += sizeof(struct vio_net_dext);
1745 len = VNET_TX_RING_SIZE * elen;
1746
1747 ncookies = VIO_MAX_RING_COOKIES;
1748 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1749 dr->cookies, &ncookies,
1750 (LDC_MAP_SHADOW |
1751 LDC_MAP_DIRECT |
1752 LDC_MAP_RW));
1753 if (IS_ERR(dring)) {
1754 err = PTR_ERR(dring);
1755 goto err_out;
1756 }
1757
1758 dr->base = dring;
1759 dr->entry_size = elen;
1760 dr->num_entries = VNET_TX_RING_SIZE;
1761 dr->prod = 0;
1762 dr->cons = 0;
1763 port->start_cons = true; /* need an initial trigger */
1764 dr->pending = VNET_TX_RING_SIZE;
1765 dr->ncookies = ncookies;
1766
1767 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1768 struct vio_net_desc *d;
1769
1770 d = vio_dring_entry(dr, i);
1771 d->hdr.state = VIO_DESC_FREE;
1772 }
1773 return 0;
1774
1775 err_out:
1776 sunvnet_port_free_tx_bufs_common(port);
1777
1778 return err;
1779 }
1780
1781 #ifdef CONFIG_NET_POLL_CONTROLLER
1782 void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp)
1783 {
1784 struct vnet_port *port;
1785 unsigned long flags;
1786
1787 spin_lock_irqsave(&vp->lock, flags);
1788 if (!list_empty(&vp->port_list)) {
1789 port = list_entry(vp->port_list.next, struct vnet_port, list);
1790 napi_schedule(&port->napi);
1791 }
1792 spin_unlock_irqrestore(&vp->lock, flags);
1793 }
1794 EXPORT_SYMBOL_GPL(sunvnet_poll_controller_common);
1795 #endif
1796
1797 void sunvnet_port_add_txq_common(struct vnet_port *port)
1798 {
1799 struct vnet *vp = port->vp;
1800 int smallest = 0;
1801 int i;
1802
1803 /* find the first least-used q
1804 * When there are more ldoms than q's, we start to
1805 * double up on ports per queue.
1806 */
1807 for (i = 0; i < VNET_MAX_TXQS; i++) {
1808 if (vp->q_used[i] == 0) {
1809 smallest = i;
1810 break;
1811 }
1812 if (vp->q_used[i] < vp->q_used[smallest])
1813 smallest = i;
1814 }
1815
1816 vp->nports++;
1817 vp->q_used[smallest]++;
1818 port->q_index = smallest;
1819 }
1820 EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common);
1821
1822 void sunvnet_port_rm_txq_common(struct vnet_port *port)
1823 {
1824 port->vp->nports--;
1825 port->vp->q_used[port->q_index]--;
1826 port->q_index = 0;
1827 }
1828 EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common);
Linux with added FPC-III support