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c861ef83 | 1 | // SPDX-License-Identifier: GPL-2.0 |
31762eaa AY |
2 | /* sunvnet.c: Sun LDOM Virtual Network Driver. |
3 | * | |
4 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> | |
867fa150 | 5 | * Copyright (C) 2016-2017 Oracle. All rights reserved. |
31762eaa AY |
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 | ||
2493b842 SN |
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 | ||
31762eaa | 46 | static int __vnet_tx_trigger(struct vnet_port *port, u32 start); |
31762eaa AY |
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); | |
67d0719f | 71 | struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port); |
31762eaa AY |
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 | ||
31762eaa AY |
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; | |
bc221a34 | 189 | port->tsolen = 0; |
31762eaa AY |
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 | ||
dc153f85 | 205 | (void)vio_ldc_send(vio, pkt, sizeof(*pkt)); |
31762eaa AY |
206 | |
207 | return -ECONNRESET; | |
31762eaa AY |
208 | } |
209 | ||
dc153f85 AY |
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)); | |
31762eaa AY |
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]; | |
dc153f85 AY |
265 | dr->rcv_nxt = 1; |
266 | dr->snd_nxt = 1; | |
31762eaa AY |
267 | |
268 | dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
dc153f85 AY |
269 | dr->rcv_nxt = 1; |
270 | dr->snd_nxt = 1; | |
31762eaa AY |
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 | { | |
dc153f85 | 292 | struct sk_buff *skb; |
31762eaa AY |
293 | unsigned long addr, off; |
294 | ||
dc153f85 | 295 | skb = netdev_alloc_skb(dev, len + VNET_PACKET_SKIP + 8 + 8); |
31762eaa AY |
296 | if (unlikely(!skb)) |
297 | return NULL; | |
298 | ||
dc153f85 | 299 | addr = (unsigned long)skb->data; |
31762eaa AY |
300 | off = ((addr + 7UL) & ~7UL) - addr; |
301 | if (off) | |
302 | skb_reserve(skb, off); | |
303 | ||
304 | return skb; | |
305 | } | |
306 | ||
98524e04 | 307 | static inline void vnet_fullcsum_ipv4(struct sk_buff *skb) |
31762eaa AY |
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 | ||
98524e04 SN |
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 | ||
31762eaa AY |
373 | static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc) |
374 | { | |
67d0719f | 375 | struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port); |
31762eaa AY |
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 | ||
31762eaa | 432 | skb_set_transport_header(skb, ihl); |
98524e04 SN |
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 | |
31762eaa AY |
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 | ||
b12a96f5 SN |
452 | if (unlikely(is_multicast_ether_addr(eth_hdr(skb)->h_dest))) |
453 | dev->stats.multicast++; | |
31762eaa AY |
454 | dev->stats.rx_packets++; |
455 | dev->stats.rx_bytes += len; | |
0f512c84 SN |
456 | port->stats.rx_packets++; |
457 | port->stats.rx_bytes += len; | |
31762eaa AY |
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 | ||
dc153f85 | 558 | BUG_ON(!desc); |
31762eaa AY |
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 | ||
dc153f85 AY |
593 | end = (end == (u32)-1) ? vio_dring_prev(dr, start) |
594 | : vio_dring_next(dr, end); | |
31762eaa AY |
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); | |
dc153f85 | 600 | |
31762eaa AY |
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 | } | |
dc153f85 AY |
622 | if (unlikely(ack_start == -1)) { |
623 | ack_end = vio_dring_prev(dr, start); | |
624 | ack_start = ack_end; | |
625 | } | |
31762eaa AY |
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; | |
31762eaa AY |
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; | |
67d0719f | 698 | dev = VNET_PORT_TO_NET_DEVICE(port); |
31762eaa AY |
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; | |
67d0719f | 743 | struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port); |
31762eaa AY |
744 | |
745 | if (pkt->tag.stype != VIO_SUBTYPE_ACK) | |
746 | pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n", | |
67d0719f | 747 | dev->name, |
31762eaa AY |
748 | pkt->tag.type, |
749 | pkt->tag.stype, | |
750 | pkt->tag.stype_env, | |
751 | pkt->tag.sid); | |
752 | ||
753 | return 0; | |
754 | } | |
755 | ||
8778b276 AY |
756 | /* If the queue is stopped, wake it up so that we'll |
757 | * send out another START message at the next TX. | |
31762eaa AY |
758 | */ |
759 | static void maybe_tx_wakeup(struct vnet_port *port) | |
760 | { | |
761 | struct netdev_queue *txq; | |
762 | ||
67d0719f AY |
763 | txq = netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port), |
764 | port->q_index); | |
31762eaa | 765 | __netif_tx_lock(txq, smp_processor_id()); |
d4aa89cc | 766 | if (likely(netif_tx_queue_stopped(txq))) |
31762eaa | 767 | netif_tx_wake_queue(txq); |
31762eaa AY |
768 | __netif_tx_unlock(txq); |
769 | } | |
770 | ||
67d0719f | 771 | bool sunvnet_port_is_up_common(struct vnet_port *vnet) |
31762eaa AY |
772 | { |
773 | struct vio_driver_state *vio = &vnet->vio; | |
774 | ||
775 | return !!(vio->hs_state & VIO_HS_COMPLETE); | |
776 | } | |
67d0719f | 777 | EXPORT_SYMBOL_GPL(sunvnet_port_is_up_common); |
31762eaa AY |
778 | |
779 | static int vnet_event_napi(struct vnet_port *port, int budget) | |
780 | { | |
8778b276 | 781 | struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port); |
31762eaa AY |
782 | struct vio_driver_state *vio = &port->vio; |
783 | int tx_wakeup, err; | |
784 | int npkts = 0; | |
bf091f3f SN |
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) { | |
867fa150 SN |
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 | ||
bf091f3f SN |
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 | ||
31762eaa | 814 | port->rx_event = 0; |
0f512c84 | 815 | port->stats.event_reset++; |
31762eaa AY |
816 | return 0; |
817 | } | |
31762eaa | 818 | |
bf091f3f | 819 | if (port->rx_event & LDC_EVENT_UP) { |
867fa150 SN |
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 | ||
bf091f3f SN |
827 | vio_link_state_change(vio, LDC_EVENT_UP); |
828 | port->rx_event = 0; | |
0f512c84 | 829 | port->stats.event_up++; |
bf091f3f SN |
830 | return 0; |
831 | } | |
31762eaa | 832 | |
dc153f85 AY |
833 | err = 0; |
834 | tx_wakeup = 0; | |
31762eaa AY |
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; | |
dc153f85 AY |
851 | pkt->start_idx = vio_dring_next(dr, |
852 | port->napi_stop_idx); | |
31762eaa | 853 | pkt->end_idx = -1; |
bf091f3f SN |
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; | |
31762eaa | 871 | } |
bf091f3f | 872 | |
31762eaa AY |
873 | if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { |
874 | if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) { | |
67d0719f | 875 | if (!sunvnet_port_is_up_common(port)) { |
31762eaa AY |
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) { | |
6ad20165 | 920 | napi_complete_done(napi, processed); |
31762eaa AY |
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); | |
31762eaa AY |
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, | |
dc153f85 | 951 | .end_idx = (u32)-1, |
31762eaa AY |
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 | ||
31762eaa AY |
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) | |
dc153f85 | 1003 | txi = VNET_TX_RING_SIZE - 1; |
31762eaa AY |
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); | |
dc153f85 | 1024 | } else if (d->hdr.state == VIO_DESC_FREE) { |
31762eaa | 1025 | break; |
dc153f85 | 1026 | } |
31762eaa AY |
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 | ||
0822c5d9 | 1044 | void sunvnet_clean_timer_expire_common(struct timer_list *t) |
31762eaa | 1045 | { |
0822c5d9 | 1046 | struct vnet_port *port = from_timer(port, t, clean_timer); |
31762eaa AY |
1047 | struct sk_buff *freeskbs; |
1048 | unsigned pending; | |
1049 | ||
67d0719f | 1050 | netif_tx_lock(VNET_PORT_TO_NET_DEVICE(port)); |
31762eaa | 1051 | freeskbs = vnet_clean_tx_ring(port, &pending); |
67d0719f | 1052 | netif_tx_unlock(VNET_PORT_TO_NET_DEVICE(port)); |
31762eaa AY |
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 | ||
dc153f85 | 1077 | err = ldc_map_single(lp, skb->data - VNET_PACKET_SKIP, blen, cookies, |
31762eaa AY |
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); | |
b54c9d5b | 1091 | err = ldc_map_single(lp, vaddr + skb_frag_off(f), |
31762eaa AY |
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 | ||
b54c9d5b | 1127 | docopy |= skb_frag_off(f) & 7; |
31762eaa AY |
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); | |
dc153f85 | 1137 | if (!nskb) { |
31762eaa AY |
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) { | |
31762eaa AY |
1158 | int offset = start + nskb->csum_offset; |
1159 | ||
98524e04 | 1160 | /* copy the headers, no csum here */ |
31762eaa AY |
1161 | if (skb_copy_bits(skb, 0, nskb->data, start)) { |
1162 | dev_kfree_skb(nskb); | |
1163 | dev_kfree_skb(skb); | |
1164 | return NULL; | |
1165 | } | |
98524e04 SN |
1166 | |
1167 | /* copy the rest, with csum calculation */ | |
31762eaa AY |
1168 | *(__sum16 *)(skb->data + offset) = 0; |
1169 | csum = skb_copy_and_csum_bits(skb, start, | |
1170 | nskb->data + start, | |
1171 | skb->len - start, 0); | |
98524e04 SN |
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 | } | |
31762eaa | 1196 | } |
98524e04 SN |
1197 | |
1198 | /* save the final result */ | |
31762eaa AY |
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 | ||
0e0cc31f Y |
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 *)) | |
31762eaa | 1223 | { |
67d0719f | 1224 | struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port); |
31762eaa | 1225 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
90919f14 | 1226 | struct sk_buff *segs, *curr, *next; |
31762eaa AY |
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 | ||
dc153f85 | 1238 | if (proto == IPPROTO_TCP) { |
31762eaa | 1239 | hlen += tcp_hdr(skb)->doff * 4; |
dc153f85 | 1240 | } else if (proto == IPPROTO_UDP) { |
31762eaa | 1241 | hlen += sizeof(struct udphdr); |
dc153f85 | 1242 | } else { |
31762eaa AY |
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; | |
90919f14 JD |
1285 | skb_list_walk_safe(segs, curr, next) { |
1286 | skb_mark_not_on_list(curr); | |
31762eaa AY |
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); | |
dc153f85 | 1292 | } else { |
31762eaa | 1293 | skb_shinfo(curr)->gso_size = 0; |
dc153f85 | 1294 | } |
31762eaa AY |
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)) | |
67d0719f AY |
1307 | status = sunvnet_start_xmit_common(curr, dev, |
1308 | vnet_tx_port); | |
31762eaa AY |
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 | ||
0e0cc31f Y |
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 *)) | |
31762eaa | 1326 | { |
31762eaa AY |
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(); | |
67d0719f | 1337 | port = vnet_tx_port(skb, dev); |
daa86e50 | 1338 | if (unlikely(!port)) |
31762eaa | 1339 | goto out_dropped; |
31762eaa AY |
1340 | |
1341 | if (skb_is_gso(skb) && skb->len > port->tsolen) { | |
67d0719f | 1342 | err = vnet_handle_offloads(port, skb, vnet_tx_port); |
31762eaa AY |
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 | ||
67c9a7e1 JD |
1353 | if (skb->protocol == htons(ETH_P_IP)) |
1354 | icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1355 | htonl(localmtu)); | |
31762eaa AY |
1356 | #if IS_ENABLED(CONFIG_IPV6) |
1357 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
67c9a7e1 | 1358 | icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu); |
31762eaa AY |
1359 | #endif |
1360 | goto out_dropped; | |
1361 | } | |
1362 | ||
1363 | skb = vnet_skb_shape(skb, 2); | |
1364 | ||
1365 | if (unlikely(!skb)) | |
1366 | goto out_dropped; | |
1367 | ||
98524e04 SN |
1368 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1369 | if (skb->protocol == htons(ETH_P_IP)) | |
1370 | vnet_fullcsum_ipv4(skb); | |
1371 | #if IS_ENABLED(CONFIG_IPV6) | |
1372 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
1373 | vnet_fullcsum_ipv6(skb); | |
1374 | #endif | |
1375 | } | |
31762eaa AY |
1376 | |
1377 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
1378 | i = skb_get_queue_mapping(skb); | |
1379 | txq = netdev_get_tx_queue(dev, i); | |
1380 | if (unlikely(vnet_tx_dring_avail(dr) < 1)) { | |
1381 | if (!netif_tx_queue_stopped(txq)) { | |
1382 | netif_tx_stop_queue(txq); | |
1383 | ||
1384 | /* This is a hard error, log it. */ | |
1385 | netdev_err(dev, "BUG! Tx Ring full when queue awake!\n"); | |
1386 | dev->stats.tx_errors++; | |
1387 | } | |
1388 | rcu_read_unlock(); | |
1389 | return NETDEV_TX_BUSY; | |
1390 | } | |
1391 | ||
1392 | d = vio_dring_cur(dr); | |
1393 | ||
1394 | txi = dr->prod; | |
1395 | ||
1396 | freeskbs = vnet_clean_tx_ring(port, &pending); | |
1397 | ||
1398 | BUG_ON(port->tx_bufs[txi].skb); | |
1399 | ||
1400 | len = skb->len; | |
1401 | if (len < ETH_ZLEN) | |
1402 | len = ETH_ZLEN; | |
1403 | ||
1404 | err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2, | |
1405 | (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW)); | |
1406 | if (err < 0) { | |
1407 | netdev_info(dev, "tx buffer map error %d\n", err); | |
1408 | goto out_dropped; | |
1409 | } | |
1410 | ||
1411 | port->tx_bufs[txi].skb = skb; | |
1412 | skb = NULL; | |
1413 | port->tx_bufs[txi].ncookies = err; | |
1414 | ||
1415 | /* We don't rely on the ACKs to free the skb in vnet_start_xmit(), | |
1416 | * thus it is safe to not set VIO_ACK_ENABLE for each transmission: | |
1417 | * the protocol itself does not require it as long as the peer | |
1418 | * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED. | |
1419 | * | |
1420 | * An ACK for every packet in the ring is expensive as the | |
1421 | * sending of LDC messages is slow and affects performance. | |
1422 | */ | |
1423 | d->hdr.ack = VIO_ACK_DISABLE; | |
1424 | d->size = len; | |
1425 | d->ncookies = port->tx_bufs[txi].ncookies; | |
1426 | for (i = 0; i < d->ncookies; i++) | |
1427 | d->cookies[i] = port->tx_bufs[txi].cookies[i]; | |
1428 | if (vio_version_after_eq(&port->vio, 1, 7)) { | |
1429 | struct vio_net_dext *dext = vio_net_ext(d); | |
1430 | ||
1431 | memset(dext, 0, sizeof(*dext)); | |
1432 | if (skb_is_gso(port->tx_bufs[txi].skb)) { | |
1433 | dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb) | |
1434 | ->gso_size; | |
1435 | dext->flags |= VNET_PKT_IPV4_LSO; | |
1436 | } | |
1437 | if (vio_version_after_eq(&port->vio, 1, 8) && | |
1438 | !port->switch_port) { | |
1439 | dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK; | |
1440 | dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK; | |
1441 | } | |
1442 | } | |
1443 | ||
1444 | /* This has to be a non-SMP write barrier because we are writing | |
1445 | * to memory which is shared with the peer LDOM. | |
1446 | */ | |
1447 | dma_wmb(); | |
1448 | ||
1449 | d->hdr.state = VIO_DESC_READY; | |
1450 | ||
1451 | /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent | |
1452 | * to notify the consumer that some descriptors are READY. | |
1453 | * After that "start" trigger, no additional triggers are needed until | |
1454 | * a DRING_STOPPED is received from the consumer. The dr->cons field | |
1455 | * (set up by vnet_ack()) has the value of the next dring index | |
1456 | * that has not yet been ack-ed. We send a "start" trigger here | |
1457 | * if, and only if, start_cons is true (reset it afterward). Conversely, | |
1458 | * vnet_ack() should check if the dring corresponding to cons | |
1459 | * is marked READY, but start_cons was false. | |
1460 | * If so, vnet_ack() should send out the missed "start" trigger. | |
1461 | * | |
1462 | * Note that the dma_wmb() above makes sure the cookies et al. are | |
1463 | * not globally visible before the VIO_DESC_READY, and that the | |
1464 | * stores are ordered correctly by the compiler. The consumer will | |
1465 | * not proceed until the VIO_DESC_READY is visible assuring that | |
1466 | * the consumer does not observe anything related to descriptors | |
1467 | * out of order. The HV trap from the LDC start trigger is the | |
1468 | * producer to consumer announcement that work is available to the | |
1469 | * consumer | |
1470 | */ | |
1471 | if (!port->start_cons) { /* previous trigger suffices */ | |
1472 | trace_vnet_skip_tx_trigger(port->vio._local_sid, | |
1473 | port->vio._peer_sid, dr->cons); | |
1474 | goto ldc_start_done; | |
1475 | } | |
1476 | ||
1477 | err = __vnet_tx_trigger(port, dr->cons); | |
1478 | if (unlikely(err < 0)) { | |
1479 | netdev_info(dev, "TX trigger error %d\n", err); | |
1480 | d->hdr.state = VIO_DESC_FREE; | |
1481 | skb = port->tx_bufs[txi].skb; | |
1482 | port->tx_bufs[txi].skb = NULL; | |
1483 | dev->stats.tx_carrier_errors++; | |
1484 | goto out_dropped; | |
1485 | } | |
1486 | ||
1487 | ldc_start_done: | |
1488 | port->start_cons = false; | |
1489 | ||
1490 | dev->stats.tx_packets++; | |
1491 | dev->stats.tx_bytes += port->tx_bufs[txi].skb->len; | |
0f512c84 SN |
1492 | port->stats.tx_packets++; |
1493 | port->stats.tx_bytes += port->tx_bufs[txi].skb->len; | |
31762eaa AY |
1494 | |
1495 | dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); | |
1496 | if (unlikely(vnet_tx_dring_avail(dr) < 1)) { | |
1497 | netif_tx_stop_queue(txq); | |
fd263fb6 | 1498 | smp_rmb(); |
31762eaa AY |
1499 | if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) |
1500 | netif_tx_wake_queue(txq); | |
1501 | } | |
1502 | ||
1503 | (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT); | |
1504 | rcu_read_unlock(); | |
1505 | ||
1506 | vnet_free_skbs(freeskbs); | |
1507 | ||
1508 | return NETDEV_TX_OK; | |
1509 | ||
1510 | out_dropped: | |
1511 | if (pending) | |
1512 | (void)mod_timer(&port->clean_timer, | |
1513 | jiffies + VNET_CLEAN_TIMEOUT); | |
1514 | else if (port) | |
1515 | del_timer(&port->clean_timer); | |
daa86e50 | 1516 | rcu_read_unlock(); |
399e06a5 | 1517 | dev_kfree_skb(skb); |
31762eaa AY |
1518 | vnet_free_skbs(freeskbs); |
1519 | dev->stats.tx_dropped++; | |
1520 | return NETDEV_TX_OK; | |
1521 | } | |
1522 | EXPORT_SYMBOL_GPL(sunvnet_start_xmit_common); | |
1523 | ||
0290bd29 | 1524 | void sunvnet_tx_timeout_common(struct net_device *dev, unsigned int txqueue) |
31762eaa AY |
1525 | { |
1526 | /* XXX Implement me XXX */ | |
1527 | } | |
1528 | EXPORT_SYMBOL_GPL(sunvnet_tx_timeout_common); | |
1529 | ||
1530 | int sunvnet_open_common(struct net_device *dev) | |
1531 | { | |
1532 | netif_carrier_on(dev); | |
1533 | netif_tx_start_all_queues(dev); | |
1534 | ||
1535 | return 0; | |
1536 | } | |
1537 | EXPORT_SYMBOL_GPL(sunvnet_open_common); | |
1538 | ||
1539 | int sunvnet_close_common(struct net_device *dev) | |
1540 | { | |
1541 | netif_tx_stop_all_queues(dev); | |
1542 | netif_carrier_off(dev); | |
1543 | ||
1544 | return 0; | |
1545 | } | |
1546 | EXPORT_SYMBOL_GPL(sunvnet_close_common); | |
1547 | ||
1548 | static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr) | |
1549 | { | |
1550 | struct vnet_mcast_entry *m; | |
1551 | ||
1552 | for (m = vp->mcast_list; m; m = m->next) { | |
1553 | if (ether_addr_equal(m->addr, addr)) | |
1554 | return m; | |
1555 | } | |
1556 | return NULL; | |
1557 | } | |
1558 | ||
1559 | static void __update_mc_list(struct vnet *vp, struct net_device *dev) | |
1560 | { | |
1561 | struct netdev_hw_addr *ha; | |
1562 | ||
1563 | netdev_for_each_mc_addr(ha, dev) { | |
1564 | struct vnet_mcast_entry *m; | |
1565 | ||
1566 | m = __vnet_mc_find(vp, ha->addr); | |
1567 | if (m) { | |
1568 | m->hit = 1; | |
1569 | continue; | |
1570 | } | |
1571 | ||
1572 | if (!m) { | |
1573 | m = kzalloc(sizeof(*m), GFP_ATOMIC); | |
1574 | if (!m) | |
1575 | continue; | |
1576 | memcpy(m->addr, ha->addr, ETH_ALEN); | |
1577 | m->hit = 1; | |
1578 | ||
1579 | m->next = vp->mcast_list; | |
1580 | vp->mcast_list = m; | |
1581 | } | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | static void __send_mc_list(struct vnet *vp, struct vnet_port *port) | |
1586 | { | |
1587 | struct vio_net_mcast_info info; | |
1588 | struct vnet_mcast_entry *m, **pp; | |
1589 | int n_addrs; | |
1590 | ||
1591 | memset(&info, 0, sizeof(info)); | |
1592 | ||
1593 | info.tag.type = VIO_TYPE_CTRL; | |
1594 | info.tag.stype = VIO_SUBTYPE_INFO; | |
1595 | info.tag.stype_env = VNET_MCAST_INFO; | |
1596 | info.tag.sid = vio_send_sid(&port->vio); | |
1597 | info.set = 1; | |
1598 | ||
1599 | n_addrs = 0; | |
1600 | for (m = vp->mcast_list; m; m = m->next) { | |
1601 | if (m->sent) | |
1602 | continue; | |
1603 | m->sent = 1; | |
1604 | memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], | |
1605 | m->addr, ETH_ALEN); | |
1606 | if (++n_addrs == VNET_NUM_MCAST) { | |
1607 | info.count = n_addrs; | |
1608 | ||
dc153f85 AY |
1609 | (void)vio_ldc_send(&port->vio, &info, |
1610 | sizeof(info)); | |
31762eaa AY |
1611 | n_addrs = 0; |
1612 | } | |
1613 | } | |
1614 | if (n_addrs) { | |
1615 | info.count = n_addrs; | |
dc153f85 | 1616 | (void)vio_ldc_send(&port->vio, &info, sizeof(info)); |
31762eaa AY |
1617 | } |
1618 | ||
1619 | info.set = 0; | |
1620 | ||
1621 | n_addrs = 0; | |
1622 | pp = &vp->mcast_list; | |
1623 | while ((m = *pp) != NULL) { | |
1624 | if (m->hit) { | |
1625 | m->hit = 0; | |
1626 | pp = &m->next; | |
1627 | continue; | |
1628 | } | |
1629 | ||
1630 | memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], | |
1631 | m->addr, ETH_ALEN); | |
1632 | if (++n_addrs == VNET_NUM_MCAST) { | |
1633 | info.count = n_addrs; | |
dc153f85 AY |
1634 | (void)vio_ldc_send(&port->vio, &info, |
1635 | sizeof(info)); | |
31762eaa AY |
1636 | n_addrs = 0; |
1637 | } | |
1638 | ||
1639 | *pp = m->next; | |
1640 | kfree(m); | |
1641 | } | |
1642 | if (n_addrs) { | |
1643 | info.count = n_addrs; | |
dc153f85 | 1644 | (void)vio_ldc_send(&port->vio, &info, sizeof(info)); |
31762eaa AY |
1645 | } |
1646 | } | |
1647 | ||
67d0719f | 1648 | void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp) |
31762eaa | 1649 | { |
31762eaa AY |
1650 | struct vnet_port *port; |
1651 | ||
1652 | rcu_read_lock(); | |
1653 | list_for_each_entry_rcu(port, &vp->port_list, list) { | |
31762eaa AY |
1654 | if (port->switch_port) { |
1655 | __update_mc_list(vp, dev); | |
1656 | __send_mc_list(vp, port); | |
1657 | break; | |
1658 | } | |
1659 | } | |
1660 | rcu_read_unlock(); | |
1661 | } | |
1662 | EXPORT_SYMBOL_GPL(sunvnet_set_rx_mode_common); | |
1663 | ||
31762eaa AY |
1664 | int sunvnet_set_mac_addr_common(struct net_device *dev, void *p) |
1665 | { | |
1666 | return -EINVAL; | |
1667 | } | |
1668 | EXPORT_SYMBOL_GPL(sunvnet_set_mac_addr_common); | |
1669 | ||
1670 | void sunvnet_port_free_tx_bufs_common(struct vnet_port *port) | |
1671 | { | |
1672 | struct vio_dring_state *dr; | |
1673 | int i; | |
1674 | ||
1675 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
1676 | ||
dc153f85 | 1677 | if (!dr->base) |
31762eaa AY |
1678 | return; |
1679 | ||
1680 | for (i = 0; i < VNET_TX_RING_SIZE; i++) { | |
1681 | struct vio_net_desc *d; | |
1682 | void *skb = port->tx_bufs[i].skb; | |
1683 | ||
1684 | if (!skb) | |
1685 | continue; | |
1686 | ||
1687 | d = vio_dring_entry(dr, i); | |
1688 | ||
1689 | ldc_unmap(port->vio.lp, | |
1690 | port->tx_bufs[i].cookies, | |
1691 | port->tx_bufs[i].ncookies); | |
1692 | dev_kfree_skb(skb); | |
1693 | port->tx_bufs[i].skb = NULL; | |
1694 | d->hdr.state = VIO_DESC_FREE; | |
1695 | } | |
1696 | ldc_free_exp_dring(port->vio.lp, dr->base, | |
1697 | (dr->entry_size * dr->num_entries), | |
1698 | dr->cookies, dr->ncookies); | |
1699 | dr->base = NULL; | |
1700 | dr->entry_size = 0; | |
1701 | dr->num_entries = 0; | |
1702 | dr->pending = 0; | |
1703 | dr->ncookies = 0; | |
1704 | } | |
1705 | EXPORT_SYMBOL_GPL(sunvnet_port_free_tx_bufs_common); | |
1706 | ||
867fa150 | 1707 | void vnet_port_reset(struct vnet_port *port) |
31762eaa AY |
1708 | { |
1709 | del_timer(&port->clean_timer); | |
1710 | sunvnet_port_free_tx_bufs_common(port); | |
1711 | port->rmtu = 0; | |
bc221a34 | 1712 | port->tso = (port->vsw == 0); /* no tso in vsw, misbehaves in bridge */ |
31762eaa AY |
1713 | port->tsolen = 0; |
1714 | } | |
867fa150 | 1715 | EXPORT_SYMBOL_GPL(vnet_port_reset); |
31762eaa AY |
1716 | |
1717 | static int vnet_port_alloc_tx_ring(struct vnet_port *port) | |
1718 | { | |
1719 | struct vio_dring_state *dr; | |
1720 | unsigned long len, elen; | |
1721 | int i, err, ncookies; | |
1722 | void *dring; | |
1723 | ||
1724 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
1725 | ||
1726 | elen = sizeof(struct vio_net_desc) + | |
1727 | sizeof(struct ldc_trans_cookie) * 2; | |
1728 | if (vio_version_after_eq(&port->vio, 1, 7)) | |
1729 | elen += sizeof(struct vio_net_dext); | |
1730 | len = VNET_TX_RING_SIZE * elen; | |
1731 | ||
1732 | ncookies = VIO_MAX_RING_COOKIES; | |
1733 | dring = ldc_alloc_exp_dring(port->vio.lp, len, | |
1734 | dr->cookies, &ncookies, | |
1735 | (LDC_MAP_SHADOW | | |
1736 | LDC_MAP_DIRECT | | |
1737 | LDC_MAP_RW)); | |
1738 | if (IS_ERR(dring)) { | |
1739 | err = PTR_ERR(dring); | |
1740 | goto err_out; | |
1741 | } | |
1742 | ||
1743 | dr->base = dring; | |
1744 | dr->entry_size = elen; | |
1745 | dr->num_entries = VNET_TX_RING_SIZE; | |
dc153f85 AY |
1746 | dr->prod = 0; |
1747 | dr->cons = 0; | |
31762eaa AY |
1748 | port->start_cons = true; /* need an initial trigger */ |
1749 | dr->pending = VNET_TX_RING_SIZE; | |
1750 | dr->ncookies = ncookies; | |
1751 | ||
1752 | for (i = 0; i < VNET_TX_RING_SIZE; ++i) { | |
1753 | struct vio_net_desc *d; | |
1754 | ||
1755 | d = vio_dring_entry(dr, i); | |
1756 | d->hdr.state = VIO_DESC_FREE; | |
1757 | } | |
1758 | return 0; | |
1759 | ||
1760 | err_out: | |
1761 | sunvnet_port_free_tx_bufs_common(port); | |
1762 | ||
1763 | return err; | |
1764 | } | |
1765 | ||
1766 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
67d0719f | 1767 | void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp) |
31762eaa | 1768 | { |
31762eaa AY |
1769 | struct vnet_port *port; |
1770 | unsigned long flags; | |
1771 | ||
1772 | spin_lock_irqsave(&vp->lock, flags); | |
1773 | if (!list_empty(&vp->port_list)) { | |
1774 | port = list_entry(vp->port_list.next, struct vnet_port, list); | |
1775 | napi_schedule(&port->napi); | |
1776 | } | |
1777 | spin_unlock_irqrestore(&vp->lock, flags); | |
1778 | } | |
1779 | EXPORT_SYMBOL_GPL(sunvnet_poll_controller_common); | |
1780 | #endif | |
1781 | ||
1782 | void sunvnet_port_add_txq_common(struct vnet_port *port) | |
1783 | { | |
1784 | struct vnet *vp = port->vp; | |
e1f1e5f7 SN |
1785 | int smallest = 0; |
1786 | int i; | |
1787 | ||
1788 | /* find the first least-used q | |
1789 | * When there are more ldoms than q's, we start to | |
1790 | * double up on ports per queue. | |
1791 | */ | |
1792 | for (i = 0; i < VNET_MAX_TXQS; i++) { | |
1793 | if (vp->q_used[i] == 0) { | |
1794 | smallest = i; | |
1795 | break; | |
1796 | } | |
1797 | if (vp->q_used[i] < vp->q_used[smallest]) | |
1798 | smallest = i; | |
1799 | } | |
31762eaa | 1800 | |
e1f1e5f7 SN |
1801 | vp->nports++; |
1802 | vp->q_used[smallest]++; | |
1803 | port->q_index = smallest; | |
31762eaa AY |
1804 | } |
1805 | EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common); | |
1806 | ||
1807 | void sunvnet_port_rm_txq_common(struct vnet_port *port) | |
1808 | { | |
1809 | port->vp->nports--; | |
e1f1e5f7 SN |
1810 | port->vp->q_used[port->q_index]--; |
1811 | port->q_index = 0; | |
31762eaa AY |
1812 | } |
1813 | EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common); |