1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* sunvnet.c: Sun LDOM Virtual Network Driver. |
3 | * |
4 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
5 | * Copyright (C) 2016-2017 Oracle. All rights reserved. |
6 | */ |
7 | |
8 | #include <linux/module.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/types.h> |
11 | #include <linux/slab.h> |
12 | #include <linux/delay.h> |
13 | #include <linux/init.h> |
14 | #include <linux/netdevice.h> |
15 | #include <linux/ethtool.h> |
16 | #include <linux/etherdevice.h> |
17 | #include <linux/mutex.h> |
18 | #include <linux/highmem.h> |
19 | #include <linux/if_vlan.h> |
20 | #define CREATE_TRACE_POINTS |
21 | #include <trace/events/sunvnet.h> |
22 | |
23 | #if IS_ENABLED(CONFIG_IPV6) |
24 | #include <linux/icmpv6.h> |
25 | #endif |
26 | |
27 | #include <net/ip.h> |
28 | #include <net/gso.h> |
29 | #include <net/icmp.h> |
30 | #include <net/route.h> |
31 | |
32 | #include <asm/vio.h> |
33 | #include <asm/ldc.h> |
34 | |
35 | #include "sunvnet_common.h" |
36 | |
37 | /* Heuristic for the number of times to exponentially backoff and |
38 | * retry sending an LDC trigger when EAGAIN is encountered |
39 | */ |
40 | #define VNET_MAX_RETRIES 10 |
41 | |
42 | MODULE_AUTHOR("David S. Miller <davem@davemloft.net>" ); |
43 | MODULE_DESCRIPTION("Sun LDOM virtual network support library" ); |
44 | MODULE_LICENSE("GPL" ); |
45 | MODULE_VERSION("1.1" ); |
46 | |
47 | static int __vnet_tx_trigger(struct vnet_port *port, u32 start); |
48 | |
49 | static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr) |
50 | { |
51 | return vio_dring_avail(dr, VNET_TX_RING_SIZE); |
52 | } |
53 | |
54 | static int vnet_handle_unknown(struct vnet_port *port, void *arg) |
55 | { |
56 | struct vio_msg_tag *pkt = arg; |
57 | |
58 | pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n" , |
59 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); |
60 | pr_err("Resetting connection\n" ); |
61 | |
62 | ldc_disconnect(port->vio.lp); |
63 | |
64 | return -ECONNRESET; |
65 | } |
66 | |
67 | static int vnet_port_alloc_tx_ring(struct vnet_port *port); |
68 | |
69 | int sunvnet_send_attr_common(struct vio_driver_state *vio) |
70 | { |
71 | struct vnet_port *port = to_vnet_port(vio); |
72 | struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port); |
73 | struct vio_net_attr_info pkt; |
74 | int framelen = ETH_FRAME_LEN; |
75 | int i, err; |
76 | |
77 | err = vnet_port_alloc_tx_ring(port: to_vnet_port(vio)); |
78 | if (err) |
79 | return err; |
80 | |
81 | memset(&pkt, 0, sizeof(pkt)); |
82 | pkt.tag.type = VIO_TYPE_CTRL; |
83 | pkt.tag.stype = VIO_SUBTYPE_INFO; |
84 | pkt.tag.stype_env = VIO_ATTR_INFO; |
85 | pkt.tag.sid = vio_send_sid(vio); |
86 | if (vio_version_before(vio, 1, 2)) |
87 | pkt.xfer_mode = VIO_DRING_MODE; |
88 | else |
89 | pkt.xfer_mode = VIO_NEW_DRING_MODE; |
90 | pkt.addr_type = VNET_ADDR_ETHERMAC; |
91 | pkt.ack_freq = 0; |
92 | for (i = 0; i < 6; i++) |
93 | pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8); |
94 | if (vio_version_after(vio, 1, 3)) { |
95 | if (port->rmtu) { |
96 | port->rmtu = min(VNET_MAXPACKET, port->rmtu); |
97 | pkt.mtu = port->rmtu; |
98 | } else { |
99 | port->rmtu = VNET_MAXPACKET; |
100 | pkt.mtu = port->rmtu; |
101 | } |
102 | if (vio_version_after_eq(vio, 1, 6)) |
103 | pkt.options = VIO_TX_DRING; |
104 | } else if (vio_version_before(vio, 1, 3)) { |
105 | pkt.mtu = framelen; |
106 | } else { /* v1.3 */ |
107 | pkt.mtu = framelen + VLAN_HLEN; |
108 | } |
109 | |
110 | pkt.cflags = 0; |
111 | if (vio_version_after_eq(vio, 1, 7) && port->tso) { |
112 | pkt.cflags |= VNET_LSO_IPV4_CAPAB; |
113 | if (!port->tsolen) |
114 | port->tsolen = VNET_MAXTSO; |
115 | pkt.ipv4_lso_maxlen = port->tsolen; |
116 | } |
117 | |
118 | pkt.plnk_updt = PHYSLINK_UPDATE_NONE; |
119 | |
120 | viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " |
121 | "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] " |
122 | "cflags[0x%04x] lso_max[%u]\n" , |
123 | pkt.xfer_mode, pkt.addr_type, |
124 | (unsigned long long)pkt.addr, |
125 | pkt.ack_freq, pkt.plnk_updt, pkt.options, |
126 | (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen); |
127 | |
128 | return vio_ldc_send(vio, &pkt, sizeof(pkt)); |
129 | } |
130 | EXPORT_SYMBOL_GPL(sunvnet_send_attr_common); |
131 | |
132 | static int handle_attr_info(struct vio_driver_state *vio, |
133 | struct vio_net_attr_info *pkt) |
134 | { |
135 | struct vnet_port *port = to_vnet_port(vio); |
136 | u64 localmtu; |
137 | u8 xfer_mode; |
138 | |
139 | viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " |
140 | "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] " |
141 | " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n" , |
142 | pkt->xfer_mode, pkt->addr_type, |
143 | (unsigned long long)pkt->addr, |
144 | pkt->ack_freq, pkt->plnk_updt, pkt->options, |
145 | (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags, |
146 | pkt->ipv4_lso_maxlen); |
147 | |
148 | pkt->tag.sid = vio_send_sid(vio); |
149 | |
150 | xfer_mode = pkt->xfer_mode; |
151 | /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */ |
152 | if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE) |
153 | xfer_mode = VIO_NEW_DRING_MODE; |
154 | |
155 | /* MTU negotiation: |
156 | * < v1.3 - ETH_FRAME_LEN exactly |
157 | * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change |
158 | * pkt->mtu for ACK |
159 | * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly |
160 | */ |
161 | if (vio_version_before(vio, 1, 3)) { |
162 | localmtu = ETH_FRAME_LEN; |
163 | } else if (vio_version_after(vio, 1, 3)) { |
164 | localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET; |
165 | localmtu = min(pkt->mtu, localmtu); |
166 | pkt->mtu = localmtu; |
167 | } else { /* v1.3 */ |
168 | localmtu = ETH_FRAME_LEN + VLAN_HLEN; |
169 | } |
170 | port->rmtu = localmtu; |
171 | |
172 | /* LSO negotiation */ |
173 | if (vio_version_after_eq(vio, 1, 7)) |
174 | port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB); |
175 | else |
176 | port->tso = false; |
177 | if (port->tso) { |
178 | if (!port->tsolen) |
179 | port->tsolen = VNET_MAXTSO; |
180 | port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen); |
181 | if (port->tsolen < VNET_MINTSO) { |
182 | port->tso = false; |
183 | port->tsolen = 0; |
184 | pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; |
185 | } |
186 | pkt->ipv4_lso_maxlen = port->tsolen; |
187 | } else { |
188 | pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; |
189 | pkt->ipv4_lso_maxlen = 0; |
190 | port->tsolen = 0; |
191 | } |
192 | |
193 | /* for version >= 1.6, ACK packet mode we support */ |
194 | if (vio_version_after_eq(vio, 1, 6)) { |
195 | pkt->xfer_mode = VIO_NEW_DRING_MODE; |
196 | pkt->options = VIO_TX_DRING; |
197 | } |
198 | |
199 | if (!(xfer_mode | VIO_NEW_DRING_MODE) || |
200 | pkt->addr_type != VNET_ADDR_ETHERMAC || |
201 | pkt->mtu != localmtu) { |
202 | viodbg(HS, "SEND NET ATTR NACK\n" ); |
203 | |
204 | pkt->tag.stype = VIO_SUBTYPE_NACK; |
205 | |
206 | (void)vio_ldc_send(vio, pkt, sizeof(*pkt)); |
207 | |
208 | return -ECONNRESET; |
209 | } |
210 | |
211 | viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] " |
212 | "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] " |
213 | "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n" , |
214 | pkt->xfer_mode, pkt->addr_type, |
215 | (unsigned long long)pkt->addr, |
216 | pkt->ack_freq, pkt->plnk_updt, pkt->options, |
217 | (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags, |
218 | pkt->ipv4_lso_maxlen); |
219 | |
220 | pkt->tag.stype = VIO_SUBTYPE_ACK; |
221 | |
222 | return vio_ldc_send(vio, pkt, sizeof(*pkt)); |
223 | } |
224 | |
225 | static int handle_attr_ack(struct vio_driver_state *vio, |
226 | struct vio_net_attr_info *pkt) |
227 | { |
228 | viodbg(HS, "GOT NET ATTR ACK\n" ); |
229 | |
230 | return 0; |
231 | } |
232 | |
233 | static int handle_attr_nack(struct vio_driver_state *vio, |
234 | struct vio_net_attr_info *pkt) |
235 | { |
236 | viodbg(HS, "GOT NET ATTR NACK\n" ); |
237 | |
238 | return -ECONNRESET; |
239 | } |
240 | |
241 | int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg) |
242 | { |
243 | struct vio_net_attr_info *pkt = arg; |
244 | |
245 | switch (pkt->tag.stype) { |
246 | case VIO_SUBTYPE_INFO: |
247 | return handle_attr_info(vio, pkt); |
248 | |
249 | case VIO_SUBTYPE_ACK: |
250 | return handle_attr_ack(vio, pkt); |
251 | |
252 | case VIO_SUBTYPE_NACK: |
253 | return handle_attr_nack(vio, pkt); |
254 | |
255 | default: |
256 | return -ECONNRESET; |
257 | } |
258 | } |
259 | EXPORT_SYMBOL_GPL(sunvnet_handle_attr_common); |
260 | |
261 | void sunvnet_handshake_complete_common(struct vio_driver_state *vio) |
262 | { |
263 | struct vio_dring_state *dr; |
264 | |
265 | dr = &vio->drings[VIO_DRIVER_RX_RING]; |
266 | dr->rcv_nxt = 1; |
267 | dr->snd_nxt = 1; |
268 | |
269 | dr = &vio->drings[VIO_DRIVER_TX_RING]; |
270 | dr->rcv_nxt = 1; |
271 | dr->snd_nxt = 1; |
272 | } |
273 | EXPORT_SYMBOL_GPL(sunvnet_handshake_complete_common); |
274 | |
275 | /* The hypervisor interface that implements copying to/from imported |
276 | * memory from another domain requires that copies are done to 8-byte |
277 | * aligned buffers, and that the lengths of such copies are also 8-byte |
278 | * multiples. |
279 | * |
280 | * So we align skb->data to an 8-byte multiple and pad-out the data |
281 | * area so we can round the copy length up to the next multiple of |
282 | * 8 for the copy. |
283 | * |
284 | * The transmitter puts the actual start of the packet 6 bytes into |
285 | * the buffer it sends over, so that the IP headers after the ethernet |
286 | * header are aligned properly. These 6 bytes are not in the descriptor |
287 | * length, they are simply implied. This offset is represented using |
288 | * the VNET_PACKET_SKIP macro. |
289 | */ |
290 | static struct sk_buff *alloc_and_align_skb(struct net_device *dev, |
291 | unsigned int len) |
292 | { |
293 | struct sk_buff *skb; |
294 | unsigned long addr, off; |
295 | |
296 | skb = netdev_alloc_skb(dev, length: len + VNET_PACKET_SKIP + 8 + 8); |
297 | if (unlikely(!skb)) |
298 | return NULL; |
299 | |
300 | addr = (unsigned long)skb->data; |
301 | off = ((addr + 7UL) & ~7UL) - addr; |
302 | if (off) |
303 | skb_reserve(skb, len: off); |
304 | |
305 | return skb; |
306 | } |
307 | |
308 | static inline void vnet_fullcsum_ipv4(struct sk_buff *skb) |
309 | { |
310 | struct iphdr *iph = ip_hdr(skb); |
311 | int offset = skb_transport_offset(skb); |
312 | |
313 | if (skb->protocol != htons(ETH_P_IP)) |
314 | return; |
315 | if (iph->protocol != IPPROTO_TCP && |
316 | iph->protocol != IPPROTO_UDP) |
317 | return; |
318 | skb->ip_summed = CHECKSUM_NONE; |
319 | skb->csum_level = 1; |
320 | skb->csum = 0; |
321 | if (iph->protocol == IPPROTO_TCP) { |
322 | struct tcphdr *ptcp = tcp_hdr(skb); |
323 | |
324 | ptcp->check = 0; |
325 | skb->csum = skb_checksum(skb, offset, len: skb->len - offset, csum: 0); |
326 | ptcp->check = csum_tcpudp_magic(saddr: iph->saddr, daddr: iph->daddr, |
327 | len: skb->len - offset, IPPROTO_TCP, |
328 | sum: skb->csum); |
329 | } else if (iph->protocol == IPPROTO_UDP) { |
330 | struct udphdr *pudp = udp_hdr(skb); |
331 | |
332 | pudp->check = 0; |
333 | skb->csum = skb_checksum(skb, offset, len: skb->len - offset, csum: 0); |
334 | pudp->check = csum_tcpudp_magic(saddr: iph->saddr, daddr: iph->daddr, |
335 | len: skb->len - offset, IPPROTO_UDP, |
336 | sum: skb->csum); |
337 | } |
338 | } |
339 | |
340 | #if IS_ENABLED(CONFIG_IPV6) |
341 | static inline void vnet_fullcsum_ipv6(struct sk_buff *skb) |
342 | { |
343 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
344 | int offset = skb_transport_offset(skb); |
345 | |
346 | if (skb->protocol != htons(ETH_P_IPV6)) |
347 | return; |
348 | if (ip6h->nexthdr != IPPROTO_TCP && |
349 | ip6h->nexthdr != IPPROTO_UDP) |
350 | return; |
351 | skb->ip_summed = CHECKSUM_NONE; |
352 | skb->csum_level = 1; |
353 | skb->csum = 0; |
354 | if (ip6h->nexthdr == IPPROTO_TCP) { |
355 | struct tcphdr *ptcp = tcp_hdr(skb); |
356 | |
357 | ptcp->check = 0; |
358 | skb->csum = skb_checksum(skb, offset, len: skb->len - offset, csum: 0); |
359 | ptcp->check = csum_ipv6_magic(saddr: &ip6h->saddr, daddr: &ip6h->daddr, |
360 | len: skb->len - offset, IPPROTO_TCP, |
361 | sum: skb->csum); |
362 | } else if (ip6h->nexthdr == IPPROTO_UDP) { |
363 | struct udphdr *pudp = udp_hdr(skb); |
364 | |
365 | pudp->check = 0; |
366 | skb->csum = skb_checksum(skb, offset, len: skb->len - offset, csum: 0); |
367 | pudp->check = csum_ipv6_magic(saddr: &ip6h->saddr, daddr: &ip6h->daddr, |
368 | len: skb->len - offset, IPPROTO_UDP, |
369 | sum: skb->csum); |
370 | } |
371 | } |
372 | #endif |
373 | |
374 | static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc) |
375 | { |
376 | struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port); |
377 | unsigned int len = desc->size; |
378 | unsigned int copy_len; |
379 | struct sk_buff *skb; |
380 | int maxlen; |
381 | int err; |
382 | |
383 | err = -EMSGSIZE; |
384 | if (port->tso && port->tsolen > port->rmtu) |
385 | maxlen = port->tsolen; |
386 | else |
387 | maxlen = port->rmtu; |
388 | if (unlikely(len < ETH_ZLEN || len > maxlen)) { |
389 | dev->stats.rx_length_errors++; |
390 | goto out_dropped; |
391 | } |
392 | |
393 | skb = alloc_and_align_skb(dev, len); |
394 | err = -ENOMEM; |
395 | if (unlikely(!skb)) { |
396 | dev->stats.rx_missed_errors++; |
397 | goto out_dropped; |
398 | } |
399 | |
400 | copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U; |
401 | skb_put(skb, len: copy_len); |
402 | err = ldc_copy(port->vio.lp, LDC_COPY_IN, |
403 | skb->data, copy_len, 0, |
404 | desc->cookies, desc->ncookies); |
405 | if (unlikely(err < 0)) { |
406 | dev->stats.rx_frame_errors++; |
407 | goto out_free_skb; |
408 | } |
409 | |
410 | skb_pull(skb, VNET_PACKET_SKIP); |
411 | skb_trim(skb, len); |
412 | skb->protocol = eth_type_trans(skb, dev); |
413 | |
414 | if (vio_version_after_eq(&port->vio, 1, 8)) { |
415 | struct vio_net_dext *dext = vio_net_ext(desc); |
416 | |
417 | skb_reset_network_header(skb); |
418 | |
419 | if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) { |
420 | if (skb->protocol == ETH_P_IP) { |
421 | struct iphdr *iph = ip_hdr(skb); |
422 | |
423 | iph->check = 0; |
424 | ip_send_check(ip: iph); |
425 | } |
426 | } |
427 | if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) && |
428 | skb->ip_summed == CHECKSUM_NONE) { |
429 | if (skb->protocol == htons(ETH_P_IP)) { |
430 | struct iphdr *iph = ip_hdr(skb); |
431 | int ihl = iph->ihl * 4; |
432 | |
433 | skb_set_transport_header(skb, offset: ihl); |
434 | vnet_fullcsum_ipv4(skb); |
435 | #if IS_ENABLED(CONFIG_IPV6) |
436 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
437 | skb_set_transport_header(skb, |
438 | offset: sizeof(struct ipv6hdr)); |
439 | vnet_fullcsum_ipv6(skb); |
440 | #endif |
441 | } |
442 | } |
443 | if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) { |
444 | skb->ip_summed = CHECKSUM_PARTIAL; |
445 | skb->csum_level = 0; |
446 | if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK) |
447 | skb->csum_level = 1; |
448 | } |
449 | } |
450 | |
451 | skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL; |
452 | |
453 | if (unlikely(is_multicast_ether_addr(eth_hdr(skb)->h_dest))) |
454 | dev->stats.multicast++; |
455 | dev->stats.rx_packets++; |
456 | dev->stats.rx_bytes += len; |
457 | port->stats.rx_packets++; |
458 | port->stats.rx_bytes += len; |
459 | napi_gro_receive(napi: &port->napi, skb); |
460 | return 0; |
461 | |
462 | out_free_skb: |
463 | kfree_skb(skb); |
464 | |
465 | out_dropped: |
466 | dev->stats.rx_dropped++; |
467 | return err; |
468 | } |
469 | |
470 | static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr, |
471 | u32 start, u32 end, u8 vio_dring_state) |
472 | { |
473 | struct vio_dring_data hdr = { |
474 | .tag = { |
475 | .type = VIO_TYPE_DATA, |
476 | .stype = VIO_SUBTYPE_ACK, |
477 | .stype_env = VIO_DRING_DATA, |
478 | .sid = vio_send_sid(&port->vio), |
479 | }, |
480 | .dring_ident = dr->ident, |
481 | .start_idx = start, |
482 | .end_idx = end, |
483 | .state = vio_dring_state, |
484 | }; |
485 | int err, delay; |
486 | int retries = 0; |
487 | |
488 | hdr.seq = dr->snd_nxt; |
489 | delay = 1; |
490 | do { |
491 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); |
492 | if (err > 0) { |
493 | dr->snd_nxt++; |
494 | break; |
495 | } |
496 | udelay(delay); |
497 | if ((delay <<= 1) > 128) |
498 | delay = 128; |
499 | if (retries++ > VNET_MAX_RETRIES) { |
500 | pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n" , |
501 | port->raddr[0], port->raddr[1], |
502 | port->raddr[2], port->raddr[3], |
503 | port->raddr[4], port->raddr[5]); |
504 | break; |
505 | } |
506 | } while (err == -EAGAIN); |
507 | |
508 | if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) { |
509 | port->stop_rx_idx = end; |
510 | port->stop_rx = true; |
511 | } else { |
512 | port->stop_rx_idx = 0; |
513 | port->stop_rx = false; |
514 | } |
515 | |
516 | return err; |
517 | } |
518 | |
519 | static struct vio_net_desc *get_rx_desc(struct vnet_port *port, |
520 | struct vio_dring_state *dr, |
521 | u32 index) |
522 | { |
523 | struct vio_net_desc *desc = port->vio.desc_buf; |
524 | int err; |
525 | |
526 | err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size, |
527 | (index * dr->entry_size), |
528 | dr->cookies, dr->ncookies); |
529 | if (err < 0) |
530 | return ERR_PTR(error: err); |
531 | |
532 | return desc; |
533 | } |
534 | |
535 | static int put_rx_desc(struct vnet_port *port, |
536 | struct vio_dring_state *dr, |
537 | struct vio_net_desc *desc, |
538 | u32 index) |
539 | { |
540 | int err; |
541 | |
542 | err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size, |
543 | (index * dr->entry_size), |
544 | dr->cookies, dr->ncookies); |
545 | if (err < 0) |
546 | return err; |
547 | |
548 | return 0; |
549 | } |
550 | |
551 | static int vnet_walk_rx_one(struct vnet_port *port, |
552 | struct vio_dring_state *dr, |
553 | u32 index, int *needs_ack) |
554 | { |
555 | struct vio_net_desc *desc = get_rx_desc(port, dr, index); |
556 | struct vio_driver_state *vio = &port->vio; |
557 | int err; |
558 | |
559 | BUG_ON(!desc); |
560 | if (IS_ERR(ptr: desc)) |
561 | return PTR_ERR(ptr: desc); |
562 | |
563 | if (desc->hdr.state != VIO_DESC_READY) |
564 | return 1; |
565 | |
566 | dma_rmb(); |
567 | |
568 | viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n" , |
569 | desc->hdr.state, desc->hdr.ack, |
570 | desc->size, desc->ncookies, |
571 | desc->cookies[0].cookie_addr, |
572 | desc->cookies[0].cookie_size); |
573 | |
574 | err = vnet_rx_one(port, desc); |
575 | if (err == -ECONNRESET) |
576 | return err; |
577 | trace_vnet_rx_one(lsid: port->vio._local_sid, rsid: port->vio._peer_sid, |
578 | index, needs_ack: desc->hdr.ack); |
579 | desc->hdr.state = VIO_DESC_DONE; |
580 | err = put_rx_desc(port, dr, desc, index); |
581 | if (err < 0) |
582 | return err; |
583 | *needs_ack = desc->hdr.ack; |
584 | return 0; |
585 | } |
586 | |
587 | static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, |
588 | u32 start, u32 end, int *npkts, int budget) |
589 | { |
590 | struct vio_driver_state *vio = &port->vio; |
591 | int ack_start = -1, ack_end = -1; |
592 | bool send_ack = true; |
593 | |
594 | end = (end == (u32)-1) ? vio_dring_prev(dr, start) |
595 | : vio_dring_next(dr, end); |
596 | |
597 | viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n" , start, end); |
598 | |
599 | while (start != end) { |
600 | int ack = 0, err = vnet_walk_rx_one(port, dr, index: start, needs_ack: &ack); |
601 | |
602 | if (err == -ECONNRESET) |
603 | return err; |
604 | if (err != 0) |
605 | break; |
606 | (*npkts)++; |
607 | if (ack_start == -1) |
608 | ack_start = start; |
609 | ack_end = start; |
610 | start = vio_dring_next(dr, start); |
611 | if (ack && start != end) { |
612 | err = vnet_send_ack(port, dr, ack_start, ack_end, |
613 | VIO_DRING_ACTIVE); |
614 | if (err == -ECONNRESET) |
615 | return err; |
616 | ack_start = -1; |
617 | } |
618 | if ((*npkts) >= budget) { |
619 | send_ack = false; |
620 | break; |
621 | } |
622 | } |
623 | if (unlikely(ack_start == -1)) { |
624 | ack_end = vio_dring_prev(dr, start); |
625 | ack_start = ack_end; |
626 | } |
627 | if (send_ack) { |
628 | port->napi_resume = false; |
629 | trace_vnet_tx_send_stopped_ack(lsid: port->vio._local_sid, |
630 | rsid: port->vio._peer_sid, |
631 | ack_end, npkts: *npkts); |
632 | return vnet_send_ack(port, dr, ack_start, ack_end, |
633 | VIO_DRING_STOPPED); |
634 | } else { |
635 | trace_vnet_tx_defer_stopped_ack(lsid: port->vio._local_sid, |
636 | rsid: port->vio._peer_sid, |
637 | ack_end, npkts: *npkts); |
638 | port->napi_resume = true; |
639 | port->napi_stop_idx = ack_end; |
640 | return 1; |
641 | } |
642 | } |
643 | |
644 | static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts, |
645 | int budget) |
646 | { |
647 | struct vio_dring_data *pkt = msgbuf; |
648 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING]; |
649 | struct vio_driver_state *vio = &port->vio; |
650 | |
651 | viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n" , |
652 | pkt->tag.stype_env, pkt->seq, dr->rcv_nxt); |
653 | |
654 | if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) |
655 | return 0; |
656 | if (unlikely(pkt->seq != dr->rcv_nxt)) { |
657 | pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n" , |
658 | pkt->seq, dr->rcv_nxt); |
659 | return 0; |
660 | } |
661 | |
662 | if (!port->napi_resume) |
663 | dr->rcv_nxt++; |
664 | |
665 | /* XXX Validate pkt->start_idx and pkt->end_idx XXX */ |
666 | |
667 | return vnet_walk_rx(port, dr, start: pkt->start_idx, end: pkt->end_idx, |
668 | npkts, budget); |
669 | } |
670 | |
671 | static int idx_is_pending(struct vio_dring_state *dr, u32 end) |
672 | { |
673 | u32 idx = dr->cons; |
674 | int found = 0; |
675 | |
676 | while (idx != dr->prod) { |
677 | if (idx == end) { |
678 | found = 1; |
679 | break; |
680 | } |
681 | idx = vio_dring_next(dr, idx); |
682 | } |
683 | return found; |
684 | } |
685 | |
686 | static int vnet_ack(struct vnet_port *port, void *msgbuf) |
687 | { |
688 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
689 | struct vio_dring_data *pkt = msgbuf; |
690 | struct net_device *dev; |
691 | u32 end; |
692 | struct vio_net_desc *desc; |
693 | struct netdev_queue *txq; |
694 | |
695 | if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) |
696 | return 0; |
697 | |
698 | end = pkt->end_idx; |
699 | dev = VNET_PORT_TO_NET_DEVICE(port); |
700 | netif_tx_lock(dev); |
701 | if (unlikely(!idx_is_pending(dr, end))) { |
702 | netif_tx_unlock(dev); |
703 | return 0; |
704 | } |
705 | |
706 | /* sync for race conditions with vnet_start_xmit() and tell xmit it |
707 | * is time to send a trigger. |
708 | */ |
709 | trace_vnet_rx_stopped_ack(lsid: port->vio._local_sid, |
710 | rsid: port->vio._peer_sid, end); |
711 | dr->cons = vio_dring_next(dr, end); |
712 | desc = vio_dring_entry(dr, dr->cons); |
713 | if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) { |
714 | /* vnet_start_xmit() just populated this dring but missed |
715 | * sending the "start" LDC message to the consumer. |
716 | * Send a "start" trigger on its behalf. |
717 | */ |
718 | if (__vnet_tx_trigger(port, start: dr->cons) > 0) |
719 | port->start_cons = false; |
720 | else |
721 | port->start_cons = true; |
722 | } else { |
723 | port->start_cons = true; |
724 | } |
725 | netif_tx_unlock(dev); |
726 | |
727 | txq = netdev_get_tx_queue(dev, index: port->q_index); |
728 | if (unlikely(netif_tx_queue_stopped(txq) && |
729 | vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr))) |
730 | return 1; |
731 | |
732 | return 0; |
733 | } |
734 | |
735 | static int vnet_nack(struct vnet_port *port, void *msgbuf) |
736 | { |
737 | /* XXX just reset or similar XXX */ |
738 | return 0; |
739 | } |
740 | |
741 | static int handle_mcast(struct vnet_port *port, void *msgbuf) |
742 | { |
743 | struct vio_net_mcast_info *pkt = msgbuf; |
744 | struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port); |
745 | |
746 | if (pkt->tag.stype != VIO_SUBTYPE_ACK) |
747 | pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n" , |
748 | dev->name, |
749 | pkt->tag.type, |
750 | pkt->tag.stype, |
751 | pkt->tag.stype_env, |
752 | pkt->tag.sid); |
753 | |
754 | return 0; |
755 | } |
756 | |
757 | /* If the queue is stopped, wake it up so that we'll |
758 | * send out another START message at the next TX. |
759 | */ |
760 | static void maybe_tx_wakeup(struct vnet_port *port) |
761 | { |
762 | struct netdev_queue *txq; |
763 | |
764 | txq = netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port), |
765 | index: port->q_index); |
766 | __netif_tx_lock(txq, smp_processor_id()); |
767 | if (likely(netif_tx_queue_stopped(txq))) |
768 | netif_tx_wake_queue(dev_queue: txq); |
769 | __netif_tx_unlock(txq); |
770 | } |
771 | |
772 | bool sunvnet_port_is_up_common(struct vnet_port *vnet) |
773 | { |
774 | struct vio_driver_state *vio = &vnet->vio; |
775 | |
776 | return !!(vio->hs_state & VIO_HS_COMPLETE); |
777 | } |
778 | EXPORT_SYMBOL_GPL(sunvnet_port_is_up_common); |
779 | |
780 | static int vnet_event_napi(struct vnet_port *port, int budget) |
781 | { |
782 | struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port); |
783 | struct vio_driver_state *vio = &port->vio; |
784 | int tx_wakeup, err; |
785 | int npkts = 0; |
786 | |
787 | /* we don't expect any other bits */ |
788 | BUG_ON(port->rx_event & ~(LDC_EVENT_DATA_READY | |
789 | LDC_EVENT_RESET | |
790 | LDC_EVENT_UP)); |
791 | |
792 | /* RESET takes precedent over any other event */ |
793 | if (port->rx_event & LDC_EVENT_RESET) { |
794 | /* a link went down */ |
795 | |
796 | if (port->vsw == 1) { |
797 | netif_tx_stop_all_queues(dev); |
798 | netif_carrier_off(dev); |
799 | } |
800 | |
801 | vio_link_state_change(vio, LDC_EVENT_RESET); |
802 | vnet_port_reset(port); |
803 | vio_port_up(vio); |
804 | |
805 | /* If the device is running but its tx queue was |
806 | * stopped (due to flow control), restart it. |
807 | * This is necessary since vnet_port_reset() |
808 | * clears the tx drings and thus we may never get |
809 | * back a VIO_TYPE_DATA ACK packet - which is |
810 | * the normal mechanism to restart the tx queue. |
811 | */ |
812 | if (netif_running(dev)) |
813 | maybe_tx_wakeup(port); |
814 | |
815 | port->rx_event = 0; |
816 | port->stats.event_reset++; |
817 | return 0; |
818 | } |
819 | |
820 | if (port->rx_event & LDC_EVENT_UP) { |
821 | /* a link came up */ |
822 | |
823 | if (port->vsw == 1) { |
824 | netif_carrier_on(dev: port->dev); |
825 | netif_tx_start_all_queues(dev: port->dev); |
826 | } |
827 | |
828 | vio_link_state_change(vio, LDC_EVENT_UP); |
829 | port->rx_event = 0; |
830 | port->stats.event_up++; |
831 | return 0; |
832 | } |
833 | |
834 | err = 0; |
835 | tx_wakeup = 0; |
836 | while (1) { |
837 | union { |
838 | struct vio_msg_tag tag; |
839 | u64 raw[8]; |
840 | } msgbuf; |
841 | |
842 | if (port->napi_resume) { |
843 | struct vio_dring_data *pkt = |
844 | (struct vio_dring_data *)&msgbuf; |
845 | struct vio_dring_state *dr = |
846 | &port->vio.drings[VIO_DRIVER_RX_RING]; |
847 | |
848 | pkt->tag.type = VIO_TYPE_DATA; |
849 | pkt->tag.stype = VIO_SUBTYPE_INFO; |
850 | pkt->tag.stype_env = VIO_DRING_DATA; |
851 | pkt->seq = dr->rcv_nxt; |
852 | pkt->start_idx = vio_dring_next(dr, |
853 | port->napi_stop_idx); |
854 | pkt->end_idx = -1; |
855 | } else { |
856 | err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); |
857 | if (unlikely(err < 0)) { |
858 | if (err == -ECONNRESET) |
859 | vio_conn_reset(vio); |
860 | break; |
861 | } |
862 | if (err == 0) |
863 | break; |
864 | viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n" , |
865 | msgbuf.tag.type, |
866 | msgbuf.tag.stype, |
867 | msgbuf.tag.stype_env, |
868 | msgbuf.tag.sid); |
869 | err = vio_validate_sid(vio, &msgbuf.tag); |
870 | if (err < 0) |
871 | break; |
872 | } |
873 | |
874 | if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { |
875 | if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) { |
876 | if (!sunvnet_port_is_up_common(port)) { |
877 | /* failures like handshake_failure() |
878 | * may have cleaned up dring, but |
879 | * NAPI polling may bring us here. |
880 | */ |
881 | err = -ECONNRESET; |
882 | break; |
883 | } |
884 | err = vnet_rx(port, msgbuf: &msgbuf, npkts: &npkts, budget); |
885 | if (npkts >= budget) |
886 | break; |
887 | if (npkts == 0) |
888 | break; |
889 | } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) { |
890 | err = vnet_ack(port, msgbuf: &msgbuf); |
891 | if (err > 0) |
892 | tx_wakeup |= err; |
893 | } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) { |
894 | err = vnet_nack(port, msgbuf: &msgbuf); |
895 | } |
896 | } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { |
897 | if (msgbuf.tag.stype_env == VNET_MCAST_INFO) |
898 | err = handle_mcast(port, msgbuf: &msgbuf); |
899 | else |
900 | err = vio_control_pkt_engine(vio, &msgbuf); |
901 | if (err) |
902 | break; |
903 | } else { |
904 | err = vnet_handle_unknown(port, arg: &msgbuf); |
905 | } |
906 | if (err == -ECONNRESET) |
907 | break; |
908 | } |
909 | if (unlikely(tx_wakeup && err != -ECONNRESET)) |
910 | maybe_tx_wakeup(port); |
911 | return npkts; |
912 | } |
913 | |
914 | int sunvnet_poll_common(struct napi_struct *napi, int budget) |
915 | { |
916 | struct vnet_port *port = container_of(napi, struct vnet_port, napi); |
917 | struct vio_driver_state *vio = &port->vio; |
918 | int processed = vnet_event_napi(port, budget); |
919 | |
920 | if (processed < budget) { |
921 | napi_complete_done(n: napi, work_done: processed); |
922 | port->rx_event &= ~LDC_EVENT_DATA_READY; |
923 | vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED); |
924 | } |
925 | return processed; |
926 | } |
927 | EXPORT_SYMBOL_GPL(sunvnet_poll_common); |
928 | |
929 | void sunvnet_event_common(void *arg, int event) |
930 | { |
931 | struct vnet_port *port = arg; |
932 | struct vio_driver_state *vio = &port->vio; |
933 | |
934 | port->rx_event |= event; |
935 | vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED); |
936 | napi_schedule(n: &port->napi); |
937 | } |
938 | EXPORT_SYMBOL_GPL(sunvnet_event_common); |
939 | |
940 | static int __vnet_tx_trigger(struct vnet_port *port, u32 start) |
941 | { |
942 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
943 | struct vio_dring_data hdr = { |
944 | .tag = { |
945 | .type = VIO_TYPE_DATA, |
946 | .stype = VIO_SUBTYPE_INFO, |
947 | .stype_env = VIO_DRING_DATA, |
948 | .sid = vio_send_sid(&port->vio), |
949 | }, |
950 | .dring_ident = dr->ident, |
951 | .start_idx = start, |
952 | .end_idx = (u32)-1, |
953 | }; |
954 | int err, delay; |
955 | int retries = 0; |
956 | |
957 | if (port->stop_rx) { |
958 | trace_vnet_tx_pending_stopped_ack(lsid: port->vio._local_sid, |
959 | rsid: port->vio._peer_sid, |
960 | ack_end: port->stop_rx_idx, npkts: -1); |
961 | err = vnet_send_ack(port, |
962 | &port->vio.drings[VIO_DRIVER_RX_RING], |
963 | port->stop_rx_idx, -1, |
964 | VIO_DRING_STOPPED); |
965 | if (err <= 0) |
966 | return err; |
967 | } |
968 | |
969 | hdr.seq = dr->snd_nxt; |
970 | delay = 1; |
971 | do { |
972 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); |
973 | if (err > 0) { |
974 | dr->snd_nxt++; |
975 | break; |
976 | } |
977 | udelay(delay); |
978 | if ((delay <<= 1) > 128) |
979 | delay = 128; |
980 | if (retries++ > VNET_MAX_RETRIES) |
981 | break; |
982 | } while (err == -EAGAIN); |
983 | trace_vnet_tx_trigger(lsid: port->vio._local_sid, |
984 | rsid: port->vio._peer_sid, start, err); |
985 | |
986 | return err; |
987 | } |
988 | |
989 | static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port, |
990 | unsigned *pending) |
991 | { |
992 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
993 | struct sk_buff *skb = NULL; |
994 | int i, txi; |
995 | |
996 | *pending = 0; |
997 | |
998 | txi = dr->prod; |
999 | for (i = 0; i < VNET_TX_RING_SIZE; ++i) { |
1000 | struct vio_net_desc *d; |
1001 | |
1002 | --txi; |
1003 | if (txi < 0) |
1004 | txi = VNET_TX_RING_SIZE - 1; |
1005 | |
1006 | d = vio_dring_entry(dr, txi); |
1007 | |
1008 | if (d->hdr.state == VIO_DESC_READY) { |
1009 | (*pending)++; |
1010 | continue; |
1011 | } |
1012 | if (port->tx_bufs[txi].skb) { |
1013 | if (d->hdr.state != VIO_DESC_DONE) |
1014 | pr_notice("invalid ring buffer state %d\n" , |
1015 | d->hdr.state); |
1016 | BUG_ON(port->tx_bufs[txi].skb->next); |
1017 | |
1018 | port->tx_bufs[txi].skb->next = skb; |
1019 | skb = port->tx_bufs[txi].skb; |
1020 | port->tx_bufs[txi].skb = NULL; |
1021 | |
1022 | ldc_unmap(port->vio.lp, |
1023 | port->tx_bufs[txi].cookies, |
1024 | port->tx_bufs[txi].ncookies); |
1025 | } else if (d->hdr.state == VIO_DESC_FREE) { |
1026 | break; |
1027 | } |
1028 | d->hdr.state = VIO_DESC_FREE; |
1029 | } |
1030 | return skb; |
1031 | } |
1032 | |
1033 | static inline void vnet_free_skbs(struct sk_buff *skb) |
1034 | { |
1035 | struct sk_buff *next; |
1036 | |
1037 | while (skb) { |
1038 | next = skb->next; |
1039 | skb->next = NULL; |
1040 | dev_kfree_skb(skb); |
1041 | skb = next; |
1042 | } |
1043 | } |
1044 | |
1045 | void sunvnet_clean_timer_expire_common(struct timer_list *t) |
1046 | { |
1047 | struct vnet_port *port = from_timer(port, t, clean_timer); |
1048 | struct sk_buff *freeskbs; |
1049 | unsigned pending; |
1050 | |
1051 | netif_tx_lock(VNET_PORT_TO_NET_DEVICE(port)); |
1052 | freeskbs = vnet_clean_tx_ring(port, pending: &pending); |
1053 | netif_tx_unlock(VNET_PORT_TO_NET_DEVICE(port)); |
1054 | |
1055 | vnet_free_skbs(skb: freeskbs); |
1056 | |
1057 | if (pending) |
1058 | (void)mod_timer(timer: &port->clean_timer, |
1059 | expires: jiffies + VNET_CLEAN_TIMEOUT); |
1060 | else |
1061 | del_timer(timer: &port->clean_timer); |
1062 | } |
1063 | EXPORT_SYMBOL_GPL(sunvnet_clean_timer_expire_common); |
1064 | |
1065 | static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb, |
1066 | struct ldc_trans_cookie *cookies, int ncookies, |
1067 | unsigned int map_perm) |
1068 | { |
1069 | int i, nc, err, blen; |
1070 | |
1071 | /* header */ |
1072 | blen = skb_headlen(skb); |
1073 | if (blen < ETH_ZLEN) |
1074 | blen = ETH_ZLEN; |
1075 | blen += VNET_PACKET_SKIP; |
1076 | blen += 8 - (blen & 7); |
1077 | |
1078 | err = ldc_map_single(lp, skb->data - VNET_PACKET_SKIP, blen, cookies, |
1079 | ncookies, map_perm); |
1080 | if (err < 0) |
1081 | return err; |
1082 | nc = err; |
1083 | |
1084 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
1085 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; |
1086 | u8 *vaddr; |
1087 | |
1088 | if (nc < ncookies) { |
1089 | vaddr = kmap_local_page(page: skb_frag_page(frag: f)); |
1090 | blen = skb_frag_size(frag: f); |
1091 | blen += 8 - (blen & 7); |
1092 | err = ldc_map_single(lp, vaddr + skb_frag_off(frag: f), |
1093 | blen, cookies + nc, ncookies - nc, |
1094 | map_perm); |
1095 | kunmap_local(vaddr); |
1096 | } else { |
1097 | err = -EMSGSIZE; |
1098 | } |
1099 | |
1100 | if (err < 0) { |
1101 | ldc_unmap(lp, cookies, nc); |
1102 | return err; |
1103 | } |
1104 | nc += err; |
1105 | } |
1106 | return nc; |
1107 | } |
1108 | |
1109 | static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies) |
1110 | { |
1111 | struct sk_buff *nskb; |
1112 | int i, len, pad, docopy; |
1113 | |
1114 | len = skb->len; |
1115 | pad = 0; |
1116 | if (len < ETH_ZLEN) { |
1117 | pad += ETH_ZLEN - skb->len; |
1118 | len += pad; |
1119 | } |
1120 | len += VNET_PACKET_SKIP; |
1121 | pad += 8 - (len & 7); |
1122 | |
1123 | /* make sure we have enough cookies and alignment in every frag */ |
1124 | docopy = skb_shinfo(skb)->nr_frags >= ncookies; |
1125 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
1126 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; |
1127 | |
1128 | docopy |= skb_frag_off(frag: f) & 7; |
1129 | } |
1130 | if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP || |
1131 | skb_tailroom(skb) < pad || |
1132 | skb_headroom(skb) < VNET_PACKET_SKIP || docopy) { |
1133 | int start = 0, offset; |
1134 | __wsum csum; |
1135 | |
1136 | len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN; |
1137 | nskb = alloc_and_align_skb(dev: skb->dev, len); |
1138 | if (!nskb) { |
1139 | dev_kfree_skb(skb); |
1140 | return NULL; |
1141 | } |
1142 | skb_reserve(skb: nskb, VNET_PACKET_SKIP); |
1143 | |
1144 | nskb->protocol = skb->protocol; |
1145 | offset = skb_mac_header(skb) - skb->data; |
1146 | skb_set_mac_header(skb: nskb, offset); |
1147 | offset = skb_network_offset(skb); |
1148 | skb_set_network_header(skb: nskb, offset); |
1149 | offset = skb_transport_offset(skb); |
1150 | skb_set_transport_header(skb: nskb, offset); |
1151 | |
1152 | offset = 0; |
1153 | nskb->csum_offset = skb->csum_offset; |
1154 | nskb->ip_summed = skb->ip_summed; |
1155 | |
1156 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
1157 | start = skb_checksum_start_offset(skb); |
1158 | if (start) { |
1159 | int offset = start + nskb->csum_offset; |
1160 | |
1161 | /* copy the headers, no csum here */ |
1162 | if (skb_copy_bits(skb, offset: 0, to: nskb->data, len: start)) { |
1163 | dev_kfree_skb(nskb); |
1164 | dev_kfree_skb(skb); |
1165 | return NULL; |
1166 | } |
1167 | |
1168 | /* copy the rest, with csum calculation */ |
1169 | *(__sum16 *)(skb->data + offset) = 0; |
1170 | csum = skb_copy_and_csum_bits(skb, offset: start, |
1171 | to: nskb->data + start, |
1172 | len: skb->len - start); |
1173 | |
1174 | /* add in the header checksums */ |
1175 | if (skb->protocol == htons(ETH_P_IP)) { |
1176 | struct iphdr *iph = ip_hdr(skb: nskb); |
1177 | |
1178 | if (iph->protocol == IPPROTO_TCP || |
1179 | iph->protocol == IPPROTO_UDP) { |
1180 | csum = csum_tcpudp_magic(saddr: iph->saddr, |
1181 | daddr: iph->daddr, |
1182 | len: skb->len - start, |
1183 | proto: iph->protocol, |
1184 | sum: csum); |
1185 | } |
1186 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
1187 | struct ipv6hdr *ip6h = ipv6_hdr(skb: nskb); |
1188 | |
1189 | if (ip6h->nexthdr == IPPROTO_TCP || |
1190 | ip6h->nexthdr == IPPROTO_UDP) { |
1191 | csum = csum_ipv6_magic(saddr: &ip6h->saddr, |
1192 | daddr: &ip6h->daddr, |
1193 | len: skb->len - start, |
1194 | proto: ip6h->nexthdr, |
1195 | sum: csum); |
1196 | } |
1197 | } |
1198 | |
1199 | /* save the final result */ |
1200 | *(__sum16 *)(nskb->data + offset) = csum; |
1201 | |
1202 | nskb->ip_summed = CHECKSUM_NONE; |
1203 | } else if (skb_copy_bits(skb, offset: 0, to: nskb->data, len: skb->len)) { |
1204 | dev_kfree_skb(nskb); |
1205 | dev_kfree_skb(skb); |
1206 | return NULL; |
1207 | } |
1208 | (void)skb_put(skb: nskb, len: skb->len); |
1209 | if (skb_is_gso(skb)) { |
1210 | skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size; |
1211 | skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type; |
1212 | } |
1213 | nskb->queue_mapping = skb->queue_mapping; |
1214 | dev_kfree_skb(skb); |
1215 | skb = nskb; |
1216 | } |
1217 | return skb; |
1218 | } |
1219 | |
1220 | static netdev_tx_t |
1221 | vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb, |
1222 | struct vnet_port *(*vnet_tx_port) |
1223 | (struct sk_buff *, struct net_device *)) |
1224 | { |
1225 | struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port); |
1226 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
1227 | struct sk_buff *segs, *curr, *next; |
1228 | int maclen, datalen; |
1229 | int status; |
1230 | int gso_size, gso_type, gso_segs; |
1231 | int hlen = skb_transport_header(skb) - skb_mac_header(skb); |
1232 | int proto = IPPROTO_IP; |
1233 | |
1234 | if (skb->protocol == htons(ETH_P_IP)) |
1235 | proto = ip_hdr(skb)->protocol; |
1236 | else if (skb->protocol == htons(ETH_P_IPV6)) |
1237 | proto = ipv6_hdr(skb)->nexthdr; |
1238 | |
1239 | if (proto == IPPROTO_TCP) { |
1240 | hlen += tcp_hdr(skb)->doff * 4; |
1241 | } else if (proto == IPPROTO_UDP) { |
1242 | hlen += sizeof(struct udphdr); |
1243 | } else { |
1244 | pr_err("vnet_handle_offloads GSO with unknown transport " |
1245 | "protocol %d tproto %d\n" , skb->protocol, proto); |
1246 | hlen = 128; /* XXX */ |
1247 | } |
1248 | datalen = port->tsolen - hlen; |
1249 | |
1250 | gso_size = skb_shinfo(skb)->gso_size; |
1251 | gso_type = skb_shinfo(skb)->gso_type; |
1252 | gso_segs = skb_shinfo(skb)->gso_segs; |
1253 | |
1254 | if (port->tso && gso_size < datalen) |
1255 | gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen); |
1256 | |
1257 | if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) { |
1258 | struct netdev_queue *txq; |
1259 | |
1260 | txq = netdev_get_tx_queue(dev, index: port->q_index); |
1261 | netif_tx_stop_queue(dev_queue: txq); |
1262 | if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs) |
1263 | return NETDEV_TX_BUSY; |
1264 | netif_tx_wake_queue(dev_queue: txq); |
1265 | } |
1266 | |
1267 | maclen = skb_network_header(skb) - skb_mac_header(skb); |
1268 | skb_pull(skb, len: maclen); |
1269 | |
1270 | if (port->tso && gso_size < datalen) { |
1271 | if (skb_unclone(skb, GFP_ATOMIC)) |
1272 | goto out_dropped; |
1273 | |
1274 | /* segment to TSO size */ |
1275 | skb_shinfo(skb)->gso_size = datalen; |
1276 | skb_shinfo(skb)->gso_segs = gso_segs; |
1277 | } |
1278 | segs = skb_gso_segment(skb, features: dev->features & ~NETIF_F_TSO); |
1279 | if (IS_ERR(ptr: segs)) |
1280 | goto out_dropped; |
1281 | |
1282 | skb_push(skb, len: maclen); |
1283 | skb_reset_mac_header(skb); |
1284 | |
1285 | status = 0; |
1286 | skb_list_walk_safe(segs, curr, next) { |
1287 | skb_mark_not_on_list(skb: curr); |
1288 | if (port->tso && curr->len > dev->mtu) { |
1289 | skb_shinfo(curr)->gso_size = gso_size; |
1290 | skb_shinfo(curr)->gso_type = gso_type; |
1291 | skb_shinfo(curr)->gso_segs = |
1292 | DIV_ROUND_UP(curr->len - hlen, gso_size); |
1293 | } else { |
1294 | skb_shinfo(curr)->gso_size = 0; |
1295 | } |
1296 | |
1297 | skb_push(skb: curr, len: maclen); |
1298 | skb_reset_mac_header(skb: curr); |
1299 | memcpy(skb_mac_header(curr), skb_mac_header(skb), |
1300 | maclen); |
1301 | curr->csum_start = skb_transport_header(skb: curr) - curr->head; |
1302 | if (ip_hdr(skb: curr)->protocol == IPPROTO_TCP) |
1303 | curr->csum_offset = offsetof(struct tcphdr, check); |
1304 | else if (ip_hdr(skb: curr)->protocol == IPPROTO_UDP) |
1305 | curr->csum_offset = offsetof(struct udphdr, check); |
1306 | |
1307 | if (!(status & NETDEV_TX_MASK)) |
1308 | status = sunvnet_start_xmit_common(skb: curr, dev, |
1309 | vnet_tx_port); |
1310 | if (status & NETDEV_TX_MASK) |
1311 | dev_kfree_skb_any(skb: curr); |
1312 | } |
1313 | |
1314 | if (!(status & NETDEV_TX_MASK)) |
1315 | dev_kfree_skb_any(skb); |
1316 | return status; |
1317 | out_dropped: |
1318 | dev->stats.tx_dropped++; |
1319 | dev_kfree_skb_any(skb); |
1320 | return NETDEV_TX_OK; |
1321 | } |
1322 | |
1323 | netdev_tx_t |
1324 | sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev, |
1325 | struct vnet_port *(*vnet_tx_port) |
1326 | (struct sk_buff *, struct net_device *)) |
1327 | { |
1328 | struct vnet_port *port = NULL; |
1329 | struct vio_dring_state *dr; |
1330 | struct vio_net_desc *d; |
1331 | unsigned int len; |
1332 | struct sk_buff *freeskbs = NULL; |
1333 | int i, err, txi; |
1334 | unsigned pending = 0; |
1335 | struct netdev_queue *txq; |
1336 | |
1337 | rcu_read_lock(); |
1338 | port = vnet_tx_port(skb, dev); |
1339 | if (unlikely(!port)) |
1340 | goto out_dropped; |
1341 | |
1342 | if (skb_is_gso(skb) && skb->len > port->tsolen) { |
1343 | err = vnet_handle_offloads(port, skb, vnet_tx_port); |
1344 | rcu_read_unlock(); |
1345 | return err; |
1346 | } |
1347 | |
1348 | if (!skb_is_gso(skb) && skb->len > port->rmtu) { |
1349 | unsigned long localmtu = port->rmtu - ETH_HLEN; |
1350 | |
1351 | if (vio_version_after_eq(&port->vio, 1, 3)) |
1352 | localmtu -= VLAN_HLEN; |
1353 | |
1354 | if (skb->protocol == htons(ETH_P_IP)) |
1355 | icmp_ndo_send(skb_in: skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
1356 | htonl(localmtu)); |
1357 | #if IS_ENABLED(CONFIG_IPV6) |
1358 | else if (skb->protocol == htons(ETH_P_IPV6)) |
1359 | icmpv6_ndo_send(skb_in: skb, ICMPV6_PKT_TOOBIG, code: 0, info: localmtu); |
1360 | #endif |
1361 | goto out_dropped; |
1362 | } |
1363 | |
1364 | skb = vnet_skb_shape(skb, ncookies: 2); |
1365 | |
1366 | if (unlikely(!skb)) |
1367 | goto out_dropped; |
1368 | |
1369 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1370 | if (skb->protocol == htons(ETH_P_IP)) |
1371 | vnet_fullcsum_ipv4(skb); |
1372 | #if IS_ENABLED(CONFIG_IPV6) |
1373 | else if (skb->protocol == htons(ETH_P_IPV6)) |
1374 | vnet_fullcsum_ipv6(skb); |
1375 | #endif |
1376 | } |
1377 | |
1378 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
1379 | i = skb_get_queue_mapping(skb); |
1380 | txq = netdev_get_tx_queue(dev, index: i); |
1381 | if (unlikely(vnet_tx_dring_avail(dr) < 1)) { |
1382 | if (!netif_tx_queue_stopped(dev_queue: txq)) { |
1383 | netif_tx_stop_queue(dev_queue: txq); |
1384 | |
1385 | /* This is a hard error, log it. */ |
1386 | netdev_err(dev, format: "BUG! Tx Ring full when queue awake!\n" ); |
1387 | dev->stats.tx_errors++; |
1388 | } |
1389 | rcu_read_unlock(); |
1390 | return NETDEV_TX_BUSY; |
1391 | } |
1392 | |
1393 | d = vio_dring_cur(dr); |
1394 | |
1395 | txi = dr->prod; |
1396 | |
1397 | freeskbs = vnet_clean_tx_ring(port, pending: &pending); |
1398 | |
1399 | BUG_ON(port->tx_bufs[txi].skb); |
1400 | |
1401 | len = skb->len; |
1402 | if (len < ETH_ZLEN) |
1403 | len = ETH_ZLEN; |
1404 | |
1405 | err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2, |
1406 | (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW)); |
1407 | if (err < 0) { |
1408 | netdev_info(dev, format: "tx buffer map error %d\n" , err); |
1409 | goto out_dropped; |
1410 | } |
1411 | |
1412 | port->tx_bufs[txi].skb = skb; |
1413 | skb = NULL; |
1414 | port->tx_bufs[txi].ncookies = err; |
1415 | |
1416 | /* We don't rely on the ACKs to free the skb in vnet_start_xmit(), |
1417 | * thus it is safe to not set VIO_ACK_ENABLE for each transmission: |
1418 | * the protocol itself does not require it as long as the peer |
1419 | * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED. |
1420 | * |
1421 | * An ACK for every packet in the ring is expensive as the |
1422 | * sending of LDC messages is slow and affects performance. |
1423 | */ |
1424 | d->hdr.ack = VIO_ACK_DISABLE; |
1425 | d->size = len; |
1426 | d->ncookies = port->tx_bufs[txi].ncookies; |
1427 | for (i = 0; i < d->ncookies; i++) |
1428 | d->cookies[i] = port->tx_bufs[txi].cookies[i]; |
1429 | if (vio_version_after_eq(&port->vio, 1, 7)) { |
1430 | struct vio_net_dext *dext = vio_net_ext(d); |
1431 | |
1432 | memset(dext, 0, sizeof(*dext)); |
1433 | if (skb_is_gso(skb: port->tx_bufs[txi].skb)) { |
1434 | dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb) |
1435 | ->gso_size; |
1436 | dext->flags |= VNET_PKT_IPV4_LSO; |
1437 | } |
1438 | if (vio_version_after_eq(&port->vio, 1, 8) && |
1439 | !port->switch_port) { |
1440 | dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK; |
1441 | dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK; |
1442 | } |
1443 | } |
1444 | |
1445 | /* This has to be a non-SMP write barrier because we are writing |
1446 | * to memory which is shared with the peer LDOM. |
1447 | */ |
1448 | dma_wmb(); |
1449 | |
1450 | d->hdr.state = VIO_DESC_READY; |
1451 | |
1452 | /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent |
1453 | * to notify the consumer that some descriptors are READY. |
1454 | * After that "start" trigger, no additional triggers are needed until |
1455 | * a DRING_STOPPED is received from the consumer. The dr->cons field |
1456 | * (set up by vnet_ack()) has the value of the next dring index |
1457 | * that has not yet been ack-ed. We send a "start" trigger here |
1458 | * if, and only if, start_cons is true (reset it afterward). Conversely, |
1459 | * vnet_ack() should check if the dring corresponding to cons |
1460 | * is marked READY, but start_cons was false. |
1461 | * If so, vnet_ack() should send out the missed "start" trigger. |
1462 | * |
1463 | * Note that the dma_wmb() above makes sure the cookies et al. are |
1464 | * not globally visible before the VIO_DESC_READY, and that the |
1465 | * stores are ordered correctly by the compiler. The consumer will |
1466 | * not proceed until the VIO_DESC_READY is visible assuring that |
1467 | * the consumer does not observe anything related to descriptors |
1468 | * out of order. The HV trap from the LDC start trigger is the |
1469 | * producer to consumer announcement that work is available to the |
1470 | * consumer |
1471 | */ |
1472 | if (!port->start_cons) { /* previous trigger suffices */ |
1473 | trace_vnet_skip_tx_trigger(lsid: port->vio._local_sid, |
1474 | rsid: port->vio._peer_sid, last: dr->cons); |
1475 | goto ldc_start_done; |
1476 | } |
1477 | |
1478 | err = __vnet_tx_trigger(port, start: dr->cons); |
1479 | if (unlikely(err < 0)) { |
1480 | netdev_info(dev, format: "TX trigger error %d\n" , err); |
1481 | d->hdr.state = VIO_DESC_FREE; |
1482 | skb = port->tx_bufs[txi].skb; |
1483 | port->tx_bufs[txi].skb = NULL; |
1484 | dev->stats.tx_carrier_errors++; |
1485 | goto out_dropped; |
1486 | } |
1487 | |
1488 | ldc_start_done: |
1489 | port->start_cons = false; |
1490 | |
1491 | dev->stats.tx_packets++; |
1492 | dev->stats.tx_bytes += port->tx_bufs[txi].skb->len; |
1493 | port->stats.tx_packets++; |
1494 | port->stats.tx_bytes += port->tx_bufs[txi].skb->len; |
1495 | |
1496 | dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); |
1497 | if (unlikely(vnet_tx_dring_avail(dr) < 1)) { |
1498 | netif_tx_stop_queue(dev_queue: txq); |
1499 | smp_rmb(); |
1500 | if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) |
1501 | netif_tx_wake_queue(dev_queue: txq); |
1502 | } |
1503 | |
1504 | (void)mod_timer(timer: &port->clean_timer, expires: jiffies + VNET_CLEAN_TIMEOUT); |
1505 | rcu_read_unlock(); |
1506 | |
1507 | vnet_free_skbs(skb: freeskbs); |
1508 | |
1509 | return NETDEV_TX_OK; |
1510 | |
1511 | out_dropped: |
1512 | if (pending) |
1513 | (void)mod_timer(timer: &port->clean_timer, |
1514 | expires: jiffies + VNET_CLEAN_TIMEOUT); |
1515 | else if (port) |
1516 | del_timer(timer: &port->clean_timer); |
1517 | rcu_read_unlock(); |
1518 | dev_kfree_skb(skb); |
1519 | vnet_free_skbs(skb: freeskbs); |
1520 | dev->stats.tx_dropped++; |
1521 | return NETDEV_TX_OK; |
1522 | } |
1523 | EXPORT_SYMBOL_GPL(sunvnet_start_xmit_common); |
1524 | |
1525 | void sunvnet_tx_timeout_common(struct net_device *dev, unsigned int txqueue) |
1526 | { |
1527 | /* XXX Implement me XXX */ |
1528 | } |
1529 | EXPORT_SYMBOL_GPL(sunvnet_tx_timeout_common); |
1530 | |
1531 | int sunvnet_open_common(struct net_device *dev) |
1532 | { |
1533 | netif_carrier_on(dev); |
1534 | netif_tx_start_all_queues(dev); |
1535 | |
1536 | return 0; |
1537 | } |
1538 | EXPORT_SYMBOL_GPL(sunvnet_open_common); |
1539 | |
1540 | int sunvnet_close_common(struct net_device *dev) |
1541 | { |
1542 | netif_tx_stop_all_queues(dev); |
1543 | netif_carrier_off(dev); |
1544 | |
1545 | return 0; |
1546 | } |
1547 | EXPORT_SYMBOL_GPL(sunvnet_close_common); |
1548 | |
1549 | static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr) |
1550 | { |
1551 | struct vnet_mcast_entry *m; |
1552 | |
1553 | for (m = vp->mcast_list; m; m = m->next) { |
1554 | if (ether_addr_equal(addr1: m->addr, addr2: addr)) |
1555 | return m; |
1556 | } |
1557 | return NULL; |
1558 | } |
1559 | |
1560 | static void __update_mc_list(struct vnet *vp, struct net_device *dev) |
1561 | { |
1562 | struct netdev_hw_addr *ha; |
1563 | |
1564 | netdev_for_each_mc_addr(ha, dev) { |
1565 | struct vnet_mcast_entry *m; |
1566 | |
1567 | m = __vnet_mc_find(vp, addr: ha->addr); |
1568 | if (m) { |
1569 | m->hit = 1; |
1570 | continue; |
1571 | } |
1572 | |
1573 | if (!m) { |
1574 | m = kzalloc(size: sizeof(*m), GFP_ATOMIC); |
1575 | if (!m) |
1576 | continue; |
1577 | memcpy(m->addr, ha->addr, ETH_ALEN); |
1578 | m->hit = 1; |
1579 | |
1580 | m->next = vp->mcast_list; |
1581 | vp->mcast_list = m; |
1582 | } |
1583 | } |
1584 | } |
1585 | |
1586 | static void __send_mc_list(struct vnet *vp, struct vnet_port *port) |
1587 | { |
1588 | struct vio_net_mcast_info info; |
1589 | struct vnet_mcast_entry *m, **pp; |
1590 | int n_addrs; |
1591 | |
1592 | memset(&info, 0, sizeof(info)); |
1593 | |
1594 | info.tag.type = VIO_TYPE_CTRL; |
1595 | info.tag.stype = VIO_SUBTYPE_INFO; |
1596 | info.tag.stype_env = VNET_MCAST_INFO; |
1597 | info.tag.sid = vio_send_sid(&port->vio); |
1598 | info.set = 1; |
1599 | |
1600 | n_addrs = 0; |
1601 | for (m = vp->mcast_list; m; m = m->next) { |
1602 | if (m->sent) |
1603 | continue; |
1604 | m->sent = 1; |
1605 | memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], |
1606 | m->addr, ETH_ALEN); |
1607 | if (++n_addrs == VNET_NUM_MCAST) { |
1608 | info.count = n_addrs; |
1609 | |
1610 | (void)vio_ldc_send(&port->vio, &info, |
1611 | sizeof(info)); |
1612 | n_addrs = 0; |
1613 | } |
1614 | } |
1615 | if (n_addrs) { |
1616 | info.count = n_addrs; |
1617 | (void)vio_ldc_send(&port->vio, &info, sizeof(info)); |
1618 | } |
1619 | |
1620 | info.set = 0; |
1621 | |
1622 | n_addrs = 0; |
1623 | pp = &vp->mcast_list; |
1624 | while ((m = *pp) != NULL) { |
1625 | if (m->hit) { |
1626 | m->hit = 0; |
1627 | pp = &m->next; |
1628 | continue; |
1629 | } |
1630 | |
1631 | memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], |
1632 | m->addr, ETH_ALEN); |
1633 | if (++n_addrs == VNET_NUM_MCAST) { |
1634 | info.count = n_addrs; |
1635 | (void)vio_ldc_send(&port->vio, &info, |
1636 | sizeof(info)); |
1637 | n_addrs = 0; |
1638 | } |
1639 | |
1640 | *pp = m->next; |
1641 | kfree(objp: m); |
1642 | } |
1643 | if (n_addrs) { |
1644 | info.count = n_addrs; |
1645 | (void)vio_ldc_send(&port->vio, &info, sizeof(info)); |
1646 | } |
1647 | } |
1648 | |
1649 | void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp) |
1650 | { |
1651 | struct vnet_port *port; |
1652 | |
1653 | rcu_read_lock(); |
1654 | list_for_each_entry_rcu(port, &vp->port_list, list) { |
1655 | if (port->switch_port) { |
1656 | __update_mc_list(vp, dev); |
1657 | __send_mc_list(vp, port); |
1658 | break; |
1659 | } |
1660 | } |
1661 | rcu_read_unlock(); |
1662 | } |
1663 | EXPORT_SYMBOL_GPL(sunvnet_set_rx_mode_common); |
1664 | |
1665 | int sunvnet_set_mac_addr_common(struct net_device *dev, void *p) |
1666 | { |
1667 | return -EINVAL; |
1668 | } |
1669 | EXPORT_SYMBOL_GPL(sunvnet_set_mac_addr_common); |
1670 | |
1671 | void sunvnet_port_free_tx_bufs_common(struct vnet_port *port) |
1672 | { |
1673 | struct vio_dring_state *dr; |
1674 | int i; |
1675 | |
1676 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
1677 | |
1678 | if (!dr->base) |
1679 | return; |
1680 | |
1681 | for (i = 0; i < VNET_TX_RING_SIZE; i++) { |
1682 | struct vio_net_desc *d; |
1683 | void *skb = port->tx_bufs[i].skb; |
1684 | |
1685 | if (!skb) |
1686 | continue; |
1687 | |
1688 | d = vio_dring_entry(dr, i); |
1689 | |
1690 | ldc_unmap(port->vio.lp, |
1691 | port->tx_bufs[i].cookies, |
1692 | port->tx_bufs[i].ncookies); |
1693 | dev_kfree_skb(skb); |
1694 | port->tx_bufs[i].skb = NULL; |
1695 | d->hdr.state = VIO_DESC_FREE; |
1696 | } |
1697 | ldc_free_exp_dring(port->vio.lp, dr->base, |
1698 | (dr->entry_size * dr->num_entries), |
1699 | dr->cookies, dr->ncookies); |
1700 | dr->base = NULL; |
1701 | dr->entry_size = 0; |
1702 | dr->num_entries = 0; |
1703 | dr->pending = 0; |
1704 | dr->ncookies = 0; |
1705 | } |
1706 | EXPORT_SYMBOL_GPL(sunvnet_port_free_tx_bufs_common); |
1707 | |
1708 | void vnet_port_reset(struct vnet_port *port) |
1709 | { |
1710 | del_timer(timer: &port->clean_timer); |
1711 | sunvnet_port_free_tx_bufs_common(port); |
1712 | port->rmtu = 0; |
1713 | port->tso = (port->vsw == 0); /* no tso in vsw, misbehaves in bridge */ |
1714 | port->tsolen = 0; |
1715 | } |
1716 | EXPORT_SYMBOL_GPL(vnet_port_reset); |
1717 | |
1718 | static int vnet_port_alloc_tx_ring(struct vnet_port *port) |
1719 | { |
1720 | struct vio_dring_state *dr; |
1721 | unsigned long len, elen; |
1722 | int i, err, ncookies; |
1723 | void *dring; |
1724 | |
1725 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
1726 | |
1727 | elen = sizeof(struct vio_net_desc) + |
1728 | sizeof(struct ldc_trans_cookie) * 2; |
1729 | if (vio_version_after_eq(&port->vio, 1, 7)) |
1730 | elen += sizeof(struct vio_net_dext); |
1731 | len = VNET_TX_RING_SIZE * elen; |
1732 | |
1733 | ncookies = VIO_MAX_RING_COOKIES; |
1734 | dring = ldc_alloc_exp_dring(port->vio.lp, len, |
1735 | dr->cookies, &ncookies, |
1736 | (LDC_MAP_SHADOW | |
1737 | LDC_MAP_DIRECT | |
1738 | LDC_MAP_RW)); |
1739 | if (IS_ERR(ptr: dring)) { |
1740 | err = PTR_ERR(ptr: dring); |
1741 | goto err_out; |
1742 | } |
1743 | |
1744 | dr->base = dring; |
1745 | dr->entry_size = elen; |
1746 | dr->num_entries = VNET_TX_RING_SIZE; |
1747 | dr->prod = 0; |
1748 | dr->cons = 0; |
1749 | port->start_cons = true; /* need an initial trigger */ |
1750 | dr->pending = VNET_TX_RING_SIZE; |
1751 | dr->ncookies = ncookies; |
1752 | |
1753 | for (i = 0; i < VNET_TX_RING_SIZE; ++i) { |
1754 | struct vio_net_desc *d; |
1755 | |
1756 | d = vio_dring_entry(dr, i); |
1757 | d->hdr.state = VIO_DESC_FREE; |
1758 | } |
1759 | return 0; |
1760 | |
1761 | err_out: |
1762 | sunvnet_port_free_tx_bufs_common(port); |
1763 | |
1764 | return err; |
1765 | } |
1766 | |
1767 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1768 | void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp) |
1769 | { |
1770 | struct vnet_port *port; |
1771 | unsigned long flags; |
1772 | |
1773 | spin_lock_irqsave(&vp->lock, flags); |
1774 | if (!list_empty(head: &vp->port_list)) { |
1775 | port = list_entry(vp->port_list.next, struct vnet_port, list); |
1776 | napi_schedule(n: &port->napi); |
1777 | } |
1778 | spin_unlock_irqrestore(lock: &vp->lock, flags); |
1779 | } |
1780 | EXPORT_SYMBOL_GPL(sunvnet_poll_controller_common); |
1781 | #endif |
1782 | |
1783 | void sunvnet_port_add_txq_common(struct vnet_port *port) |
1784 | { |
1785 | struct vnet *vp = port->vp; |
1786 | int smallest = 0; |
1787 | int i; |
1788 | |
1789 | /* find the first least-used q |
1790 | * When there are more ldoms than q's, we start to |
1791 | * double up on ports per queue. |
1792 | */ |
1793 | for (i = 0; i < VNET_MAX_TXQS; i++) { |
1794 | if (vp->q_used[i] == 0) { |
1795 | smallest = i; |
1796 | break; |
1797 | } |
1798 | if (vp->q_used[i] < vp->q_used[smallest]) |
1799 | smallest = i; |
1800 | } |
1801 | |
1802 | vp->nports++; |
1803 | vp->q_used[smallest]++; |
1804 | port->q_index = smallest; |
1805 | } |
1806 | EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common); |
1807 | |
1808 | void sunvnet_port_rm_txq_common(struct vnet_port *port) |
1809 | { |
1810 | port->vp->nports--; |
1811 | port->vp->q_used[port->q_index]--; |
1812 | port->q_index = 0; |
1813 | } |
1814 | EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common); |
1815 | |