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Commit | Line | Data |
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4c521e42 DM |
1 | /* sunvnet.c: Sun LDOM Virtual Network Driver. |
2 | * | |
3d452e55 | 3 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
4c521e42 DM |
4 | */ |
5 | ||
4d5870ec JP |
6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
7 | ||
4c521e42 DM |
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> | |
9184a046 | 17 | #include <linux/mutex.h> |
da38c564 | 18 | #include <linux/highmem.h> |
e4defc77 | 19 | #include <linux/if_vlan.h> |
4c521e42 | 20 | |
a2b78e9b DS |
21 | #if IS_ENABLED(CONFIG_IPV6) |
22 | #include <linux/icmpv6.h> | |
23 | #endif | |
24 | ||
6d0ba919 | 25 | #include <net/ip.h> |
a2b78e9b DS |
26 | #include <net/icmp.h> |
27 | #include <net/route.h> | |
28 | ||
4c521e42 DM |
29 | #include <asm/vio.h> |
30 | #include <asm/ldc.h> | |
31 | ||
32 | #include "sunvnet.h" | |
33 | ||
34 | #define DRV_MODULE_NAME "sunvnet" | |
4c521e42 DM |
35 | #define DRV_MODULE_VERSION "1.0" |
36 | #define DRV_MODULE_RELDATE "June 25, 2007" | |
37 | ||
f73d12bd | 38 | static char version[] = |
4c521e42 DM |
39 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; |
40 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); | |
41 | MODULE_DESCRIPTION("Sun LDOM virtual network driver"); | |
42 | MODULE_LICENSE("GPL"); | |
43 | MODULE_VERSION(DRV_MODULE_VERSION); | |
44 | ||
d51bffd1 SV |
45 | #define VNET_MAX_TXQS 16 |
46 | ||
adddc32d SV |
47 | /* Heuristic for the number of times to exponentially backoff and |
48 | * retry sending an LDC trigger when EAGAIN is encountered | |
49 | */ | |
50 | #define VNET_MAX_RETRIES 10 | |
51 | ||
d1015645 | 52 | static int __vnet_tx_trigger(struct vnet_port *port, u32 start); |
8e2b60cd | 53 | static void vnet_port_reset(struct vnet_port *port); |
d1015645 | 54 | |
4c521e42 DM |
55 | /* Ordered from largest major to lowest */ |
56 | static struct vio_version vnet_versions[] = { | |
6d0ba919 DS |
57 | { .major = 1, .minor = 8 }, |
58 | { .major = 1, .minor = 7 }, | |
e4defc77 | 59 | { .major = 1, .minor = 6 }, |
4c521e42 DM |
60 | { .major = 1, .minor = 0 }, |
61 | }; | |
62 | ||
63 | static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr) | |
64 | { | |
65 | return vio_dring_avail(dr, VNET_TX_RING_SIZE); | |
66 | } | |
67 | ||
68 | static int vnet_handle_unknown(struct vnet_port *port, void *arg) | |
69 | { | |
70 | struct vio_msg_tag *pkt = arg; | |
71 | ||
4d5870ec | 72 | pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n", |
4c521e42 | 73 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); |
4d5870ec | 74 | pr_err("Resetting connection\n"); |
4c521e42 DM |
75 | |
76 | ldc_disconnect(port->vio.lp); | |
77 | ||
78 | return -ECONNRESET; | |
79 | } | |
80 | ||
d6732489 DS |
81 | static int vnet_port_alloc_tx_ring(struct vnet_port *port); |
82 | ||
4c521e42 DM |
83 | static int vnet_send_attr(struct vio_driver_state *vio) |
84 | { | |
85 | struct vnet_port *port = to_vnet_port(vio); | |
86 | struct net_device *dev = port->vp->dev; | |
87 | struct vio_net_attr_info pkt; | |
e4defc77 | 88 | int framelen = ETH_FRAME_LEN; |
d6732489 DS |
89 | int i, err; |
90 | ||
91 | err = vnet_port_alloc_tx_ring(to_vnet_port(vio)); | |
92 | if (err) | |
93 | return err; | |
4c521e42 DM |
94 | |
95 | memset(&pkt, 0, sizeof(pkt)); | |
96 | pkt.tag.type = VIO_TYPE_CTRL; | |
97 | pkt.tag.stype = VIO_SUBTYPE_INFO; | |
98 | pkt.tag.stype_env = VIO_ATTR_INFO; | |
99 | pkt.tag.sid = vio_send_sid(vio); | |
e4defc77 DS |
100 | if (vio_version_before(vio, 1, 2)) |
101 | pkt.xfer_mode = VIO_DRING_MODE; | |
102 | else | |
103 | pkt.xfer_mode = VIO_NEW_DRING_MODE; | |
4c521e42 DM |
104 | pkt.addr_type = VNET_ADDR_ETHERMAC; |
105 | pkt.ack_freq = 0; | |
106 | for (i = 0; i < 6; i++) | |
107 | pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8); | |
e4defc77 DS |
108 | if (vio_version_after(vio, 1, 3)) { |
109 | if (port->rmtu) { | |
110 | port->rmtu = min(VNET_MAXPACKET, port->rmtu); | |
111 | pkt.mtu = port->rmtu; | |
112 | } else { | |
113 | port->rmtu = VNET_MAXPACKET; | |
114 | pkt.mtu = port->rmtu; | |
115 | } | |
116 | if (vio_version_after_eq(vio, 1, 6)) | |
117 | pkt.options = VIO_TX_DRING; | |
118 | } else if (vio_version_before(vio, 1, 3)) { | |
119 | pkt.mtu = framelen; | |
120 | } else { /* v1.3 */ | |
121 | pkt.mtu = framelen + VLAN_HLEN; | |
122 | } | |
123 | ||
e4defc77 | 124 | pkt.cflags = 0; |
368e36ed DS |
125 | if (vio_version_after_eq(vio, 1, 7) && port->tso) { |
126 | pkt.cflags |= VNET_LSO_IPV4_CAPAB; | |
127 | if (!port->tsolen) | |
128 | port->tsolen = VNET_MAXTSO; | |
129 | pkt.ipv4_lso_maxlen = port->tsolen; | |
130 | } | |
131 | ||
132 | pkt.plnk_updt = PHYSLINK_UPDATE_NONE; | |
4c521e42 DM |
133 | |
134 | viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " | |
e4defc77 DS |
135 | "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] " |
136 | "cflags[0x%04x] lso_max[%u]\n", | |
4c521e42 | 137 | pkt.xfer_mode, pkt.addr_type, |
e4defc77 DS |
138 | (unsigned long long)pkt.addr, |
139 | pkt.ack_freq, pkt.plnk_updt, pkt.options, | |
140 | (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen); | |
141 | ||
4c521e42 DM |
142 | |
143 | return vio_ldc_send(vio, &pkt, sizeof(pkt)); | |
144 | } | |
145 | ||
146 | static int handle_attr_info(struct vio_driver_state *vio, | |
147 | struct vio_net_attr_info *pkt) | |
148 | { | |
e4defc77 DS |
149 | struct vnet_port *port = to_vnet_port(vio); |
150 | u64 localmtu; | |
151 | u8 xfer_mode; | |
152 | ||
153 | viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " | |
154 | "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] " | |
155 | " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n", | |
4c521e42 | 156 | pkt->xfer_mode, pkt->addr_type, |
e4defc77 DS |
157 | (unsigned long long)pkt->addr, |
158 | pkt->ack_freq, pkt->plnk_updt, pkt->options, | |
159 | (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags, | |
160 | pkt->ipv4_lso_maxlen); | |
4c521e42 DM |
161 | |
162 | pkt->tag.sid = vio_send_sid(vio); | |
163 | ||
e4defc77 DS |
164 | xfer_mode = pkt->xfer_mode; |
165 | /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */ | |
166 | if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE) | |
167 | xfer_mode = VIO_NEW_DRING_MODE; | |
168 | ||
169 | /* MTU negotiation: | |
170 | * < v1.3 - ETH_FRAME_LEN exactly | |
171 | * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change | |
172 | * pkt->mtu for ACK | |
173 | * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly | |
174 | */ | |
175 | if (vio_version_before(vio, 1, 3)) { | |
176 | localmtu = ETH_FRAME_LEN; | |
177 | } else if (vio_version_after(vio, 1, 3)) { | |
178 | localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET; | |
179 | localmtu = min(pkt->mtu, localmtu); | |
180 | pkt->mtu = localmtu; | |
181 | } else { /* v1.3 */ | |
182 | localmtu = ETH_FRAME_LEN + VLAN_HLEN; | |
183 | } | |
184 | port->rmtu = localmtu; | |
185 | ||
368e36ed DS |
186 | /* LSO negotiation */ |
187 | if (vio_version_after_eq(vio, 1, 7)) | |
188 | port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB); | |
189 | else | |
190 | port->tso = false; | |
191 | if (port->tso) { | |
192 | if (!port->tsolen) | |
193 | port->tsolen = VNET_MAXTSO; | |
194 | port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen); | |
195 | if (port->tsolen < VNET_MINTSO) { | |
196 | port->tso = false; | |
197 | port->tsolen = 0; | |
198 | pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; | |
199 | } | |
200 | pkt->ipv4_lso_maxlen = port->tsolen; | |
201 | } else { | |
202 | pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; | |
203 | pkt->ipv4_lso_maxlen = 0; | |
204 | } | |
205 | ||
e4defc77 DS |
206 | /* for version >= 1.6, ACK packet mode we support */ |
207 | if (vio_version_after_eq(vio, 1, 6)) { | |
208 | pkt->xfer_mode = VIO_NEW_DRING_MODE; | |
209 | pkt->options = VIO_TX_DRING; | |
210 | } | |
211 | ||
212 | if (!(xfer_mode | VIO_NEW_DRING_MODE) || | |
4c521e42 | 213 | pkt->addr_type != VNET_ADDR_ETHERMAC || |
e4defc77 | 214 | pkt->mtu != localmtu) { |
4c521e42 DM |
215 | viodbg(HS, "SEND NET ATTR NACK\n"); |
216 | ||
217 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
218 | ||
219 | (void) vio_ldc_send(vio, pkt, sizeof(*pkt)); | |
220 | ||
221 | return -ECONNRESET; | |
222 | } else { | |
e4defc77 DS |
223 | viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] " |
224 | "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] " | |
225 | "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n", | |
226 | pkt->xfer_mode, pkt->addr_type, | |
227 | (unsigned long long)pkt->addr, | |
228 | pkt->ack_freq, pkt->plnk_updt, pkt->options, | |
229 | (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags, | |
230 | pkt->ipv4_lso_maxlen); | |
4c521e42 DM |
231 | |
232 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
233 | ||
234 | return vio_ldc_send(vio, pkt, sizeof(*pkt)); | |
235 | } | |
236 | ||
237 | } | |
238 | ||
239 | static int handle_attr_ack(struct vio_driver_state *vio, | |
240 | struct vio_net_attr_info *pkt) | |
241 | { | |
242 | viodbg(HS, "GOT NET ATTR ACK\n"); | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | static int handle_attr_nack(struct vio_driver_state *vio, | |
248 | struct vio_net_attr_info *pkt) | |
249 | { | |
250 | viodbg(HS, "GOT NET ATTR NACK\n"); | |
251 | ||
252 | return -ECONNRESET; | |
253 | } | |
254 | ||
255 | static int vnet_handle_attr(struct vio_driver_state *vio, void *arg) | |
256 | { | |
257 | struct vio_net_attr_info *pkt = arg; | |
258 | ||
259 | switch (pkt->tag.stype) { | |
260 | case VIO_SUBTYPE_INFO: | |
261 | return handle_attr_info(vio, pkt); | |
262 | ||
263 | case VIO_SUBTYPE_ACK: | |
264 | return handle_attr_ack(vio, pkt); | |
265 | ||
266 | case VIO_SUBTYPE_NACK: | |
267 | return handle_attr_nack(vio, pkt); | |
268 | ||
269 | default: | |
270 | return -ECONNRESET; | |
271 | } | |
272 | } | |
273 | ||
274 | static void vnet_handshake_complete(struct vio_driver_state *vio) | |
275 | { | |
276 | struct vio_dring_state *dr; | |
277 | ||
278 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
279 | dr->snd_nxt = dr->rcv_nxt = 1; | |
280 | ||
281 | dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
282 | dr->snd_nxt = dr->rcv_nxt = 1; | |
283 | } | |
284 | ||
285 | /* The hypervisor interface that implements copying to/from imported | |
286 | * memory from another domain requires that copies are done to 8-byte | |
287 | * aligned buffers, and that the lengths of such copies are also 8-byte | |
288 | * multiples. | |
289 | * | |
290 | * So we align skb->data to an 8-byte multiple and pad-out the data | |
291 | * area so we can round the copy length up to the next multiple of | |
292 | * 8 for the copy. | |
293 | * | |
294 | * The transmitter puts the actual start of the packet 6 bytes into | |
295 | * the buffer it sends over, so that the IP headers after the ethernet | |
296 | * header are aligned properly. These 6 bytes are not in the descriptor | |
297 | * length, they are simply implied. This offset is represented using | |
298 | * the VNET_PACKET_SKIP macro. | |
299 | */ | |
300 | static struct sk_buff *alloc_and_align_skb(struct net_device *dev, | |
301 | unsigned int len) | |
302 | { | |
303 | struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8); | |
304 | unsigned long addr, off; | |
305 | ||
306 | if (unlikely(!skb)) | |
307 | return NULL; | |
308 | ||
309 | addr = (unsigned long) skb->data; | |
310 | off = ((addr + 7UL) & ~7UL) - addr; | |
311 | if (off) | |
312 | skb_reserve(skb, off); | |
313 | ||
314 | return skb; | |
315 | } | |
316 | ||
6d0ba919 DS |
317 | static inline void vnet_fullcsum(struct sk_buff *skb) |
318 | { | |
319 | struct iphdr *iph = ip_hdr(skb); | |
320 | int offset = skb_transport_offset(skb); | |
321 | ||
322 | if (skb->protocol != htons(ETH_P_IP)) | |
323 | return; | |
324 | if (iph->protocol != IPPROTO_TCP && | |
325 | iph->protocol != IPPROTO_UDP) | |
326 | return; | |
327 | skb->ip_summed = CHECKSUM_NONE; | |
328 | skb->csum_level = 1; | |
329 | skb->csum = 0; | |
330 | if (iph->protocol == IPPROTO_TCP) { | |
331 | struct tcphdr *ptcp = tcp_hdr(skb); | |
332 | ||
333 | ptcp->check = 0; | |
334 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
335 | ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
336 | skb->len - offset, IPPROTO_TCP, | |
337 | skb->csum); | |
338 | } else if (iph->protocol == IPPROTO_UDP) { | |
339 | struct udphdr *pudp = udp_hdr(skb); | |
340 | ||
341 | pudp->check = 0; | |
342 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
343 | pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
344 | skb->len - offset, IPPROTO_UDP, | |
345 | skb->csum); | |
346 | } | |
347 | } | |
348 | ||
349 | static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc) | |
4c521e42 DM |
350 | { |
351 | struct net_device *dev = port->vp->dev; | |
6d0ba919 | 352 | unsigned int len = desc->size; |
4c521e42 DM |
353 | unsigned int copy_len; |
354 | struct sk_buff *skb; | |
86cfeab6 | 355 | int maxlen; |
4c521e42 DM |
356 | int err; |
357 | ||
358 | err = -EMSGSIZE; | |
86cfeab6 DS |
359 | if (port->tso && port->tsolen > port->rmtu) |
360 | maxlen = port->tsolen; | |
361 | else | |
362 | maxlen = port->rmtu; | |
363 | if (unlikely(len < ETH_ZLEN || len > maxlen)) { | |
4c521e42 DM |
364 | dev->stats.rx_length_errors++; |
365 | goto out_dropped; | |
366 | } | |
367 | ||
368 | skb = alloc_and_align_skb(dev, len); | |
369 | err = -ENOMEM; | |
370 | if (unlikely(!skb)) { | |
371 | dev->stats.rx_missed_errors++; | |
372 | goto out_dropped; | |
373 | } | |
374 | ||
375 | copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U; | |
376 | skb_put(skb, copy_len); | |
377 | err = ldc_copy(port->vio.lp, LDC_COPY_IN, | |
378 | skb->data, copy_len, 0, | |
6d0ba919 | 379 | desc->cookies, desc->ncookies); |
4c521e42 DM |
380 | if (unlikely(err < 0)) { |
381 | dev->stats.rx_frame_errors++; | |
382 | goto out_free_skb; | |
383 | } | |
384 | ||
385 | skb_pull(skb, VNET_PACKET_SKIP); | |
386 | skb_trim(skb, len); | |
387 | skb->protocol = eth_type_trans(skb, dev); | |
388 | ||
6d0ba919 DS |
389 | if (vio_version_after_eq(&port->vio, 1, 8)) { |
390 | struct vio_net_dext *dext = vio_net_ext(desc); | |
391 | ||
5f2f3cad SV |
392 | skb_reset_network_header(skb); |
393 | ||
6d0ba919 DS |
394 | if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) { |
395 | if (skb->protocol == ETH_P_IP) { | |
5f2f3cad | 396 | struct iphdr *iph = ip_hdr(skb); |
6d0ba919 DS |
397 | |
398 | iph->check = 0; | |
399 | ip_send_check(iph); | |
400 | } | |
401 | } | |
402 | if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) && | |
5f2f3cad SV |
403 | skb->ip_summed == CHECKSUM_NONE) { |
404 | if (skb->protocol == htons(ETH_P_IP)) { | |
405 | struct iphdr *iph = ip_hdr(skb); | |
406 | int ihl = iph->ihl * 4; | |
407 | ||
408 | skb_reset_transport_header(skb); | |
409 | skb_set_transport_header(skb, ihl); | |
410 | vnet_fullcsum(skb); | |
411 | } | |
412 | } | |
6d0ba919 DS |
413 | if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) { |
414 | skb->ip_summed = CHECKSUM_PARTIAL; | |
415 | skb->csum_level = 0; | |
416 | if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK) | |
417 | skb->csum_level = 1; | |
418 | } | |
419 | } | |
420 | ||
1b6b0a47 DS |
421 | skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL; |
422 | ||
4c521e42 DM |
423 | dev->stats.rx_packets++; |
424 | dev->stats.rx_bytes += len; | |
69088822 | 425 | napi_gro_receive(&port->napi, skb); |
4c521e42 DM |
426 | return 0; |
427 | ||
428 | out_free_skb: | |
429 | kfree_skb(skb); | |
430 | ||
431 | out_dropped: | |
432 | dev->stats.rx_dropped++; | |
433 | return err; | |
434 | } | |
435 | ||
436 | static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr, | |
437 | u32 start, u32 end, u8 vio_dring_state) | |
438 | { | |
439 | struct vio_dring_data hdr = { | |
440 | .tag = { | |
441 | .type = VIO_TYPE_DATA, | |
442 | .stype = VIO_SUBTYPE_ACK, | |
443 | .stype_env = VIO_DRING_DATA, | |
444 | .sid = vio_send_sid(&port->vio), | |
445 | }, | |
446 | .dring_ident = dr->ident, | |
447 | .start_idx = start, | |
448 | .end_idx = end, | |
449 | .state = vio_dring_state, | |
450 | }; | |
451 | int err, delay; | |
adddc32d | 452 | int retries = 0; |
4c521e42 DM |
453 | |
454 | hdr.seq = dr->snd_nxt; | |
455 | delay = 1; | |
456 | do { | |
457 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); | |
458 | if (err > 0) { | |
459 | dr->snd_nxt++; | |
460 | break; | |
461 | } | |
462 | udelay(delay); | |
463 | if ((delay <<= 1) > 128) | |
464 | delay = 128; | |
adddc32d SV |
465 | if (retries++ > VNET_MAX_RETRIES) { |
466 | pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n", | |
467 | port->raddr[0], port->raddr[1], | |
468 | port->raddr[2], port->raddr[3], | |
469 | port->raddr[4], port->raddr[5]); | |
d1015645 | 470 | break; |
adddc32d | 471 | } |
4c521e42 DM |
472 | } while (err == -EAGAIN); |
473 | ||
d1015645 SV |
474 | if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) { |
475 | port->stop_rx_idx = end; | |
476 | port->stop_rx = true; | |
477 | } else { | |
478 | port->stop_rx_idx = 0; | |
479 | port->stop_rx = false; | |
480 | } | |
481 | ||
4c521e42 DM |
482 | return err; |
483 | } | |
484 | ||
4c521e42 DM |
485 | static struct vio_net_desc *get_rx_desc(struct vnet_port *port, |
486 | struct vio_dring_state *dr, | |
487 | u32 index) | |
488 | { | |
489 | struct vio_net_desc *desc = port->vio.desc_buf; | |
490 | int err; | |
491 | ||
492 | err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size, | |
493 | (index * dr->entry_size), | |
494 | dr->cookies, dr->ncookies); | |
495 | if (err < 0) | |
496 | return ERR_PTR(err); | |
497 | ||
498 | return desc; | |
499 | } | |
500 | ||
501 | static int put_rx_desc(struct vnet_port *port, | |
502 | struct vio_dring_state *dr, | |
503 | struct vio_net_desc *desc, | |
504 | u32 index) | |
505 | { | |
506 | int err; | |
507 | ||
508 | err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size, | |
509 | (index * dr->entry_size), | |
510 | dr->cookies, dr->ncookies); | |
511 | if (err < 0) | |
512 | return err; | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | static int vnet_walk_rx_one(struct vnet_port *port, | |
518 | struct vio_dring_state *dr, | |
519 | u32 index, int *needs_ack) | |
520 | { | |
521 | struct vio_net_desc *desc = get_rx_desc(port, dr, index); | |
522 | struct vio_driver_state *vio = &port->vio; | |
523 | int err; | |
524 | ||
69088822 | 525 | BUG_ON(desc == NULL); |
4c521e42 DM |
526 | if (IS_ERR(desc)) |
527 | return PTR_ERR(desc); | |
528 | ||
78dcff7b DS |
529 | if (desc->hdr.state != VIO_DESC_READY) |
530 | return 1; | |
531 | ||
b4468cc6 | 532 | dma_rmb(); |
78dcff7b | 533 | |
3f4528d6 | 534 | viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n", |
4c521e42 DM |
535 | desc->hdr.state, desc->hdr.ack, |
536 | desc->size, desc->ncookies, | |
537 | desc->cookies[0].cookie_addr, | |
538 | desc->cookies[0].cookie_size); | |
539 | ||
6d0ba919 | 540 | err = vnet_rx_one(port, desc); |
4c521e42 DM |
541 | if (err == -ECONNRESET) |
542 | return err; | |
543 | desc->hdr.state = VIO_DESC_DONE; | |
544 | err = put_rx_desc(port, dr, desc, index); | |
545 | if (err < 0) | |
546 | return err; | |
547 | *needs_ack = desc->hdr.ack; | |
548 | return 0; | |
549 | } | |
550 | ||
551 | static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, | |
69088822 | 552 | u32 start, u32 end, int *npkts, int budget) |
4c521e42 DM |
553 | { |
554 | struct vio_driver_state *vio = &port->vio; | |
555 | int ack_start = -1, ack_end = -1; | |
69088822 | 556 | bool send_ack = true; |
4c521e42 | 557 | |
fe47c3c2 DE |
558 | end = (end == (u32) -1) ? vio_dring_prev(dr, start) |
559 | : vio_dring_next(dr, end); | |
4c521e42 DM |
560 | |
561 | viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end); | |
562 | ||
563 | while (start != end) { | |
564 | int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack); | |
565 | if (err == -ECONNRESET) | |
566 | return err; | |
567 | if (err != 0) | |
568 | break; | |
69088822 | 569 | (*npkts)++; |
4c521e42 DM |
570 | if (ack_start == -1) |
571 | ack_start = start; | |
572 | ack_end = start; | |
fe47c3c2 | 573 | start = vio_dring_next(dr, start); |
4c521e42 DM |
574 | if (ack && start != end) { |
575 | err = vnet_send_ack(port, dr, ack_start, ack_end, | |
576 | VIO_DRING_ACTIVE); | |
577 | if (err == -ECONNRESET) | |
578 | return err; | |
579 | ack_start = -1; | |
580 | } | |
69088822 SV |
581 | if ((*npkts) >= budget) { |
582 | send_ack = false; | |
583 | break; | |
584 | } | |
4c521e42 DM |
585 | } |
586 | if (unlikely(ack_start == -1)) | |
fe47c3c2 | 587 | ack_start = ack_end = vio_dring_prev(dr, start); |
69088822 SV |
588 | if (send_ack) { |
589 | port->napi_resume = false; | |
590 | return vnet_send_ack(port, dr, ack_start, ack_end, | |
591 | VIO_DRING_STOPPED); | |
592 | } else { | |
593 | port->napi_resume = true; | |
594 | port->napi_stop_idx = ack_end; | |
595 | return 1; | |
596 | } | |
4c521e42 DM |
597 | } |
598 | ||
69088822 SV |
599 | static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts, |
600 | int budget) | |
4c521e42 DM |
601 | { |
602 | struct vio_dring_data *pkt = msgbuf; | |
603 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING]; | |
604 | struct vio_driver_state *vio = &port->vio; | |
605 | ||
3f4528d6 | 606 | viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n", |
4c521e42 DM |
607 | pkt->tag.stype_env, pkt->seq, dr->rcv_nxt); |
608 | ||
609 | if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) | |
610 | return 0; | |
611 | if (unlikely(pkt->seq != dr->rcv_nxt)) { | |
4d5870ec JP |
612 | pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n", |
613 | pkt->seq, dr->rcv_nxt); | |
4c521e42 DM |
614 | return 0; |
615 | } | |
616 | ||
69088822 SV |
617 | if (!port->napi_resume) |
618 | dr->rcv_nxt++; | |
4c521e42 DM |
619 | |
620 | /* XXX Validate pkt->start_idx and pkt->end_idx XXX */ | |
621 | ||
69088822 SV |
622 | return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx, |
623 | npkts, budget); | |
4c521e42 DM |
624 | } |
625 | ||
626 | static int idx_is_pending(struct vio_dring_state *dr, u32 end) | |
627 | { | |
628 | u32 idx = dr->cons; | |
629 | int found = 0; | |
630 | ||
631 | while (idx != dr->prod) { | |
632 | if (idx == end) { | |
633 | found = 1; | |
634 | break; | |
635 | } | |
fe47c3c2 | 636 | idx = vio_dring_next(dr, idx); |
4c521e42 DM |
637 | } |
638 | return found; | |
639 | } | |
640 | ||
641 | static int vnet_ack(struct vnet_port *port, void *msgbuf) | |
642 | { | |
643 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
644 | struct vio_dring_data *pkt = msgbuf; | |
645 | struct net_device *dev; | |
646 | struct vnet *vp; | |
647 | u32 end; | |
d1015645 | 648 | struct vio_net_desc *desc; |
d51bffd1 SV |
649 | struct netdev_queue *txq; |
650 | ||
4c521e42 DM |
651 | if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) |
652 | return 0; | |
653 | ||
654 | end = pkt->end_idx; | |
69088822 SV |
655 | vp = port->vp; |
656 | dev = vp->dev; | |
b0cffed5 SV |
657 | netif_tx_lock(dev); |
658 | if (unlikely(!idx_is_pending(dr, end))) { | |
659 | netif_tx_unlock(dev); | |
660 | return 0; | |
661 | } | |
662 | ||
d1015645 SV |
663 | /* sync for race conditions with vnet_start_xmit() and tell xmit it |
664 | * is time to send a trigger. | |
665 | */ | |
fe47c3c2 | 666 | dr->cons = vio_dring_next(dr, end); |
d1015645 | 667 | desc = vio_dring_entry(dr, dr->cons); |
777362d7 | 668 | if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) { |
d1015645 SV |
669 | /* vnet_start_xmit() just populated this dring but missed |
670 | * sending the "start" LDC message to the consumer. | |
671 | * Send a "start" trigger on its behalf. | |
672 | */ | |
673 | if (__vnet_tx_trigger(port, dr->cons) > 0) | |
674 | port->start_cons = false; | |
675 | else | |
676 | port->start_cons = true; | |
677 | } else { | |
678 | port->start_cons = true; | |
679 | } | |
69088822 | 680 | netif_tx_unlock(dev); |
d1015645 | 681 | |
d51bffd1 SV |
682 | txq = netdev_get_tx_queue(dev, port->q_index); |
683 | if (unlikely(netif_tx_queue_stopped(txq) && | |
4c521e42 DM |
684 | vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr))) |
685 | return 1; | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | static int vnet_nack(struct vnet_port *port, void *msgbuf) | |
691 | { | |
692 | /* XXX just reset or similar XXX */ | |
693 | return 0; | |
694 | } | |
695 | ||
028ebff2 DM |
696 | static int handle_mcast(struct vnet_port *port, void *msgbuf) |
697 | { | |
698 | struct vio_net_mcast_info *pkt = msgbuf; | |
699 | ||
700 | if (pkt->tag.stype != VIO_SUBTYPE_ACK) | |
4d5870ec | 701 | pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n", |
028ebff2 DM |
702 | port->vp->dev->name, |
703 | pkt->tag.type, | |
704 | pkt->tag.stype, | |
705 | pkt->tag.stype_env, | |
706 | pkt->tag.sid); | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
d51bffd1 SV |
711 | /* Got back a STOPPED LDC message on port. If the queue is stopped, |
712 | * wake it up so that we'll send out another START message at the | |
713 | * next TX. | |
714 | */ | |
715 | static void maybe_tx_wakeup(struct vnet_port *port) | |
4c521e42 | 716 | { |
d51bffd1 | 717 | struct netdev_queue *txq; |
4c521e42 | 718 | |
d51bffd1 SV |
719 | txq = netdev_get_tx_queue(port->vp->dev, port->q_index); |
720 | __netif_tx_lock(txq, smp_processor_id()); | |
721 | if (likely(netif_tx_queue_stopped(txq))) { | |
722 | struct vio_dring_state *dr; | |
723 | ||
724 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
6c3ce8a3 | 725 | netif_tx_wake_queue(txq); |
4c521e42 | 726 | } |
d51bffd1 | 727 | __netif_tx_unlock(txq); |
4c521e42 DM |
728 | } |
729 | ||
69088822 SV |
730 | static inline bool port_is_up(struct vnet_port *vnet) |
731 | { | |
732 | struct vio_driver_state *vio = &vnet->vio; | |
733 | ||
734 | return !!(vio->hs_state & VIO_HS_COMPLETE); | |
735 | } | |
736 | ||
737 | static int vnet_event_napi(struct vnet_port *port, int budget) | |
4c521e42 | 738 | { |
4c521e42 | 739 | struct vio_driver_state *vio = &port->vio; |
4c521e42 | 740 | int tx_wakeup, err; |
69088822 SV |
741 | int npkts = 0; |
742 | int event = (port->rx_event & LDC_EVENT_RESET); | |
4c521e42 | 743 | |
69088822 | 744 | ldc_ctrl: |
4c521e42 DM |
745 | if (unlikely(event == LDC_EVENT_RESET || |
746 | event == LDC_EVENT_UP)) { | |
747 | vio_link_state_change(vio, event); | |
4c521e42 | 748 | |
e4defc77 | 749 | if (event == LDC_EVENT_RESET) { |
8e2b60cd | 750 | vnet_port_reset(port); |
d762acdb | 751 | vio_port_up(vio); |
e4defc77 | 752 | } |
69088822 SV |
753 | port->rx_event = 0; |
754 | return 0; | |
4c521e42 | 755 | } |
69088822 SV |
756 | /* We may have multiple LDC events in rx_event. Unroll send_events() */ |
757 | event = (port->rx_event & LDC_EVENT_UP); | |
758 | port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP); | |
759 | if (event == LDC_EVENT_UP) | |
760 | goto ldc_ctrl; | |
761 | event = port->rx_event; | |
762 | if (!(event & LDC_EVENT_DATA_READY)) | |
763 | return 0; | |
4c521e42 | 764 | |
69088822 SV |
765 | /* we dont expect any other bits than RESET, UP, DATA_READY */ |
766 | BUG_ON(event != LDC_EVENT_DATA_READY); | |
4c521e42 DM |
767 | |
768 | tx_wakeup = err = 0; | |
769 | while (1) { | |
770 | union { | |
771 | struct vio_msg_tag tag; | |
772 | u64 raw[8]; | |
773 | } msgbuf; | |
774 | ||
69088822 SV |
775 | if (port->napi_resume) { |
776 | struct vio_dring_data *pkt = | |
777 | (struct vio_dring_data *)&msgbuf; | |
778 | struct vio_dring_state *dr = | |
779 | &port->vio.drings[VIO_DRIVER_RX_RING]; | |
780 | ||
781 | pkt->tag.type = VIO_TYPE_DATA; | |
782 | pkt->tag.stype = VIO_SUBTYPE_INFO; | |
783 | pkt->tag.stype_env = VIO_DRING_DATA; | |
784 | pkt->seq = dr->rcv_nxt; | |
fe47c3c2 | 785 | pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx); |
69088822 SV |
786 | pkt->end_idx = -1; |
787 | goto napi_resume; | |
788 | } | |
4c521e42 DM |
789 | err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); |
790 | if (unlikely(err < 0)) { | |
791 | if (err == -ECONNRESET) | |
792 | vio_conn_reset(vio); | |
793 | break; | |
794 | } | |
795 | if (err == 0) | |
796 | break; | |
797 | viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", | |
798 | msgbuf.tag.type, | |
799 | msgbuf.tag.stype, | |
800 | msgbuf.tag.stype_env, | |
801 | msgbuf.tag.sid); | |
802 | err = vio_validate_sid(vio, &msgbuf.tag); | |
803 | if (err < 0) | |
804 | break; | |
69088822 | 805 | napi_resume: |
4c521e42 DM |
806 | if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { |
807 | if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) { | |
69088822 SV |
808 | if (!port_is_up(port)) { |
809 | /* failures like handshake_failure() | |
810 | * may have cleaned up dring, but | |
811 | * NAPI polling may bring us here. | |
812 | */ | |
813 | err = -ECONNRESET; | |
814 | break; | |
815 | } | |
816 | err = vnet_rx(port, &msgbuf, &npkts, budget); | |
817 | if (npkts >= budget) | |
818 | break; | |
8c4ee3e7 SV |
819 | if (npkts == 0) |
820 | break; | |
4c521e42 DM |
821 | } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) { |
822 | err = vnet_ack(port, &msgbuf); | |
823 | if (err > 0) | |
824 | tx_wakeup |= err; | |
825 | } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) { | |
826 | err = vnet_nack(port, &msgbuf); | |
827 | } | |
828 | } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { | |
028ebff2 DM |
829 | if (msgbuf.tag.stype_env == VNET_MCAST_INFO) |
830 | err = handle_mcast(port, &msgbuf); | |
831 | else | |
832 | err = vio_control_pkt_engine(vio, &msgbuf); | |
4c521e42 DM |
833 | if (err) |
834 | break; | |
835 | } else { | |
836 | err = vnet_handle_unknown(port, &msgbuf); | |
837 | } | |
838 | if (err == -ECONNRESET) | |
839 | break; | |
840 | } | |
4c521e42 | 841 | if (unlikely(tx_wakeup && err != -ECONNRESET)) |
d51bffd1 | 842 | maybe_tx_wakeup(port); |
69088822 SV |
843 | return npkts; |
844 | } | |
845 | ||
846 | static int vnet_poll(struct napi_struct *napi, int budget) | |
847 | { | |
848 | struct vnet_port *port = container_of(napi, struct vnet_port, napi); | |
849 | struct vio_driver_state *vio = &port->vio; | |
850 | int processed = vnet_event_napi(port, budget); | |
851 | ||
852 | if (processed < budget) { | |
853 | napi_complete(napi); | |
7bd68bfd | 854 | port->rx_event &= ~LDC_EVENT_DATA_READY; |
69088822 SV |
855 | vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED); |
856 | } | |
857 | return processed; | |
858 | } | |
859 | ||
860 | static void vnet_event(void *arg, int event) | |
861 | { | |
862 | struct vnet_port *port = arg; | |
863 | struct vio_driver_state *vio = &port->vio; | |
864 | ||
865 | port->rx_event |= event; | |
866 | vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED); | |
867 | napi_schedule(&port->napi); | |
1d311ad2 | 868 | |
4c521e42 DM |
869 | } |
870 | ||
d1015645 | 871 | static int __vnet_tx_trigger(struct vnet_port *port, u32 start) |
4c521e42 DM |
872 | { |
873 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
874 | struct vio_dring_data hdr = { | |
875 | .tag = { | |
876 | .type = VIO_TYPE_DATA, | |
877 | .stype = VIO_SUBTYPE_INFO, | |
878 | .stype_env = VIO_DRING_DATA, | |
879 | .sid = vio_send_sid(&port->vio), | |
880 | }, | |
881 | .dring_ident = dr->ident, | |
d1015645 | 882 | .start_idx = start, |
4c521e42 DM |
883 | .end_idx = (u32) -1, |
884 | }; | |
885 | int err, delay; | |
adddc32d | 886 | int retries = 0; |
4c521e42 | 887 | |
d1015645 SV |
888 | if (port->stop_rx) { |
889 | err = vnet_send_ack(port, | |
890 | &port->vio.drings[VIO_DRIVER_RX_RING], | |
891 | port->stop_rx_idx, -1, | |
892 | VIO_DRING_STOPPED); | |
893 | if (err <= 0) | |
894 | return err; | |
895 | } | |
896 | ||
4c521e42 DM |
897 | hdr.seq = dr->snd_nxt; |
898 | delay = 1; | |
899 | do { | |
900 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); | |
901 | if (err > 0) { | |
902 | dr->snd_nxt++; | |
903 | break; | |
904 | } | |
905 | udelay(delay); | |
906 | if ((delay <<= 1) > 128) | |
907 | delay = 128; | |
adddc32d SV |
908 | if (retries++ > VNET_MAX_RETRIES) |
909 | break; | |
4c521e42 DM |
910 | } while (err == -EAGAIN); |
911 | ||
912 | return err; | |
913 | } | |
914 | ||
915 | struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb) | |
916 | { | |
917 | unsigned int hash = vnet_hashfn(skb->data); | |
918 | struct hlist_head *hp = &vp->port_hash[hash]; | |
4c521e42 DM |
919 | struct vnet_port *port; |
920 | ||
2a968dd8 | 921 | hlist_for_each_entry_rcu(port, hp, hash) { |
8266f5fc DS |
922 | if (!port_is_up(port)) |
923 | continue; | |
2e42e474 | 924 | if (ether_addr_equal(port->raddr, skb->data)) |
4c521e42 DM |
925 | return port; |
926 | } | |
2a968dd8 | 927 | list_for_each_entry_rcu(port, &vp->port_list, list) { |
8266f5fc DS |
928 | if (!port->switch_port) |
929 | continue; | |
930 | if (!port_is_up(port)) | |
931 | continue; | |
932 | return port; | |
933 | } | |
934 | return NULL; | |
4c521e42 DM |
935 | } |
936 | ||
8e845f4c DS |
937 | static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port, |
938 | unsigned *pending) | |
939 | { | |
940 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
941 | struct sk_buff *skb = NULL; | |
942 | int i, txi; | |
943 | ||
944 | *pending = 0; | |
945 | ||
8e2b60cd | 946 | txi = dr->prod; |
8e845f4c DS |
947 | for (i = 0; i < VNET_TX_RING_SIZE; ++i) { |
948 | struct vio_net_desc *d; | |
949 | ||
8e2b60cd DS |
950 | --txi; |
951 | if (txi < 0) | |
952 | txi = VNET_TX_RING_SIZE-1; | |
8e845f4c | 953 | |
8e2b60cd | 954 | d = vio_dring_entry(dr, txi); |
8e845f4c | 955 | |
8e2b60cd | 956 | if (d->hdr.state == VIO_DESC_READY) { |
8e845f4c | 957 | (*pending)++; |
8e2b60cd | 958 | continue; |
8e845f4c | 959 | } |
8e2b60cd DS |
960 | if (port->tx_bufs[txi].skb) { |
961 | if (d->hdr.state != VIO_DESC_DONE) | |
962 | pr_notice("invalid ring buffer state %d\n", | |
963 | d->hdr.state); | |
964 | BUG_ON(port->tx_bufs[txi].skb->next); | |
965 | ||
966 | port->tx_bufs[txi].skb->next = skb; | |
967 | skb = port->tx_bufs[txi].skb; | |
968 | port->tx_bufs[txi].skb = NULL; | |
969 | ||
970 | ldc_unmap(port->vio.lp, | |
971 | port->tx_bufs[txi].cookies, | |
972 | port->tx_bufs[txi].ncookies); | |
973 | } else if (d->hdr.state == VIO_DESC_FREE) | |
974 | break; | |
975 | d->hdr.state = VIO_DESC_FREE; | |
8e845f4c DS |
976 | } |
977 | return skb; | |
978 | } | |
979 | ||
980 | static inline void vnet_free_skbs(struct sk_buff *skb) | |
981 | { | |
982 | struct sk_buff *next; | |
983 | ||
984 | while (skb) { | |
985 | next = skb->next; | |
986 | skb->next = NULL; | |
987 | dev_kfree_skb(skb); | |
988 | skb = next; | |
989 | } | |
990 | } | |
991 | ||
992 | static void vnet_clean_timer_expire(unsigned long port0) | |
993 | { | |
994 | struct vnet_port *port = (struct vnet_port *)port0; | |
995 | struct sk_buff *freeskbs; | |
996 | unsigned pending; | |
8e845f4c | 997 | |
13b13dd9 | 998 | netif_tx_lock(port->vp->dev); |
8e845f4c | 999 | freeskbs = vnet_clean_tx_ring(port, &pending); |
13b13dd9 | 1000 | netif_tx_unlock(port->vp->dev); |
8e845f4c DS |
1001 | |
1002 | vnet_free_skbs(freeskbs); | |
1003 | ||
1004 | if (pending) | |
1005 | (void)mod_timer(&port->clean_timer, | |
1006 | jiffies + VNET_CLEAN_TIMEOUT); | |
1007 | else | |
1008 | del_timer(&port->clean_timer); | |
1009 | } | |
1010 | ||
da38c564 DS |
1011 | static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb, |
1012 | struct ldc_trans_cookie *cookies, int ncookies, | |
1013 | unsigned int map_perm) | |
1014 | { | |
1015 | int i, nc, err, blen; | |
1016 | ||
1017 | /* header */ | |
1018 | blen = skb_headlen(skb); | |
1019 | if (blen < ETH_ZLEN) | |
1020 | blen = ETH_ZLEN; | |
1021 | blen += VNET_PACKET_SKIP; | |
1022 | blen += 8 - (blen & 7); | |
1023 | ||
1024 | err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies, | |
1025 | ncookies, map_perm); | |
1026 | if (err < 0) | |
1027 | return err; | |
1028 | nc = err; | |
1029 | ||
1030 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1031 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; | |
1032 | u8 *vaddr; | |
1033 | ||
1034 | if (nc < ncookies) { | |
1035 | vaddr = kmap_atomic(skb_frag_page(f)); | |
1036 | blen = skb_frag_size(f); | |
1037 | blen += 8 - (blen & 7); | |
1038 | err = ldc_map_single(lp, vaddr + f->page_offset, | |
1039 | blen, cookies + nc, ncookies - nc, | |
1040 | map_perm); | |
1041 | kunmap_atomic(vaddr); | |
1042 | } else { | |
1043 | err = -EMSGSIZE; | |
1044 | } | |
1045 | ||
1046 | if (err < 0) { | |
1047 | ldc_unmap(lp, cookies, nc); | |
1048 | return err; | |
1049 | } | |
1050 | nc += err; | |
1051 | } | |
1052 | return nc; | |
1053 | } | |
1054 | ||
1055 | static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies) | |
8e845f4c DS |
1056 | { |
1057 | struct sk_buff *nskb; | |
da38c564 | 1058 | int i, len, pad, docopy; |
8e845f4c DS |
1059 | |
1060 | len = skb->len; | |
1061 | pad = 0; | |
1062 | if (len < ETH_ZLEN) { | |
1063 | pad += ETH_ZLEN - skb->len; | |
1064 | len += pad; | |
1065 | } | |
1066 | len += VNET_PACKET_SKIP; | |
1067 | pad += 8 - (len & 7); | |
8e845f4c | 1068 | |
da38c564 DS |
1069 | /* make sure we have enough cookies and alignment in every frag */ |
1070 | docopy = skb_shinfo(skb)->nr_frags >= ncookies; | |
1071 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1072 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; | |
1073 | ||
1074 | docopy |= f->page_offset & 7; | |
1075 | } | |
8e845f4c DS |
1076 | if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP || |
1077 | skb_tailroom(skb) < pad || | |
da38c564 | 1078 | skb_headroom(skb) < VNET_PACKET_SKIP || docopy) { |
1b6b0a47 DS |
1079 | int start = 0, offset; |
1080 | __wsum csum; | |
6d0ba919 | 1081 | |
da38c564 DS |
1082 | len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN; |
1083 | nskb = alloc_and_align_skb(skb->dev, len); | |
1084 | if (nskb == NULL) { | |
1085 | dev_kfree_skb(skb); | |
1086 | return NULL; | |
1087 | } | |
8e845f4c | 1088 | skb_reserve(nskb, VNET_PACKET_SKIP); |
6d0ba919 DS |
1089 | |
1090 | nskb->protocol = skb->protocol; | |
1091 | offset = skb_mac_header(skb) - skb->data; | |
1092 | skb_set_mac_header(nskb, offset); | |
1093 | offset = skb_network_header(skb) - skb->data; | |
1094 | skb_set_network_header(nskb, offset); | |
1095 | offset = skb_transport_header(skb) - skb->data; | |
1096 | skb_set_transport_header(nskb, offset); | |
1097 | ||
1b6b0a47 | 1098 | offset = 0; |
6d0ba919 DS |
1099 | nskb->csum_offset = skb->csum_offset; |
1100 | nskb->ip_summed = skb->ip_summed; | |
1101 | ||
1b6b0a47 DS |
1102 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
1103 | start = skb_checksum_start_offset(skb); | |
1104 | if (start) { | |
1105 | struct iphdr *iph = ip_hdr(nskb); | |
1106 | int offset = start + nskb->csum_offset; | |
1107 | ||
1108 | if (skb_copy_bits(skb, 0, nskb->data, start)) { | |
1109 | dev_kfree_skb(nskb); | |
1110 | dev_kfree_skb(skb); | |
1111 | return NULL; | |
1112 | } | |
1113 | *(__sum16 *)(skb->data + offset) = 0; | |
1114 | csum = skb_copy_and_csum_bits(skb, start, | |
1115 | nskb->data + start, | |
1116 | skb->len - start, 0); | |
1117 | if (iph->protocol == IPPROTO_TCP || | |
1118 | iph->protocol == IPPROTO_UDP) { | |
1119 | csum = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
1120 | skb->len - start, | |
1121 | iph->protocol, csum); | |
1122 | } | |
1123 | *(__sum16 *)(nskb->data + offset) = csum; | |
1124 | ||
1125 | nskb->ip_summed = CHECKSUM_NONE; | |
1126 | } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) { | |
8e845f4c DS |
1127 | dev_kfree_skb(nskb); |
1128 | dev_kfree_skb(skb); | |
1129 | return NULL; | |
1130 | } | |
1131 | (void)skb_put(nskb, skb->len); | |
9a72dd4d DS |
1132 | if (skb_is_gso(skb)) { |
1133 | skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size; | |
1134 | skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type; | |
1135 | } | |
44ba582b | 1136 | nskb->queue_mapping = skb->queue_mapping; |
8e845f4c DS |
1137 | dev_kfree_skb(skb); |
1138 | skb = nskb; | |
1139 | } | |
8e845f4c DS |
1140 | return skb; |
1141 | } | |
1142 | ||
d51bffd1 SV |
1143 | static u16 |
1144 | vnet_select_queue(struct net_device *dev, struct sk_buff *skb, | |
1145 | void *accel_priv, select_queue_fallback_t fallback) | |
1146 | { | |
1147 | struct vnet *vp = netdev_priv(dev); | |
1148 | struct vnet_port *port = __tx_port_find(vp, skb); | |
1149 | ||
c647cc3f DS |
1150 | if (port == NULL) |
1151 | return 0; | |
d51bffd1 SV |
1152 | return port->q_index; |
1153 | } | |
1154 | ||
9a72dd4d DS |
1155 | static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev); |
1156 | ||
1157 | static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb) | |
1158 | { | |
1159 | struct net_device *dev = port->vp->dev; | |
1160 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
1161 | struct sk_buff *segs; | |
368e36ed | 1162 | int maclen, datalen; |
9a72dd4d | 1163 | int status; |
368e36ed DS |
1164 | int gso_size, gso_type, gso_segs; |
1165 | int hlen = skb_transport_header(skb) - skb_mac_header(skb); | |
1166 | int proto = IPPROTO_IP; | |
1167 | ||
1168 | if (skb->protocol == htons(ETH_P_IP)) | |
1169 | proto = ip_hdr(skb)->protocol; | |
1170 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
1171 | proto = ipv6_hdr(skb)->nexthdr; | |
1172 | ||
1173 | if (proto == IPPROTO_TCP) | |
1174 | hlen += tcp_hdr(skb)->doff * 4; | |
1175 | else if (proto == IPPROTO_UDP) | |
1176 | hlen += sizeof(struct udphdr); | |
1177 | else { | |
1178 | pr_err("vnet_handle_offloads GSO with unknown transport " | |
1179 | "protocol %d tproto %d\n", skb->protocol, proto); | |
1180 | hlen = 128; /* XXX */ | |
1181 | } | |
1182 | datalen = port->tsolen - hlen; | |
1183 | ||
1184 | gso_size = skb_shinfo(skb)->gso_size; | |
1185 | gso_type = skb_shinfo(skb)->gso_type; | |
1186 | gso_segs = skb_shinfo(skb)->gso_segs; | |
1187 | ||
1188 | if (port->tso && gso_size < datalen) | |
1189 | gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen); | |
9a72dd4d | 1190 | |
368e36ed | 1191 | if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) { |
9a72dd4d DS |
1192 | struct netdev_queue *txq; |
1193 | ||
1194 | txq = netdev_get_tx_queue(dev, port->q_index); | |
1195 | netif_tx_stop_queue(txq); | |
1196 | if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs) | |
1197 | return NETDEV_TX_BUSY; | |
1198 | netif_tx_wake_queue(txq); | |
1199 | } | |
1200 | ||
1201 | maclen = skb_network_header(skb) - skb_mac_header(skb); | |
1202 | skb_pull(skb, maclen); | |
1203 | ||
368e36ed | 1204 | if (port->tso && gso_size < datalen) { |
f7d70f74 DS |
1205 | if (skb_unclone(skb, GFP_ATOMIC)) |
1206 | goto out_dropped; | |
1207 | ||
368e36ed DS |
1208 | /* segment to TSO size */ |
1209 | skb_shinfo(skb)->gso_size = datalen; | |
1210 | skb_shinfo(skb)->gso_segs = gso_segs; | |
9a72dd4d | 1211 | } |
f7d70f74 DS |
1212 | segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO); |
1213 | if (IS_ERR(segs)) | |
1214 | goto out_dropped; | |
9a72dd4d DS |
1215 | |
1216 | skb_push(skb, maclen); | |
1217 | skb_reset_mac_header(skb); | |
1218 | ||
1219 | status = 0; | |
1220 | while (segs) { | |
1221 | struct sk_buff *curr = segs; | |
1222 | ||
1223 | segs = segs->next; | |
1224 | curr->next = NULL; | |
368e36ed DS |
1225 | if (port->tso && curr->len > dev->mtu) { |
1226 | skb_shinfo(curr)->gso_size = gso_size; | |
1227 | skb_shinfo(curr)->gso_type = gso_type; | |
1228 | skb_shinfo(curr)->gso_segs = | |
1229 | DIV_ROUND_UP(curr->len - hlen, gso_size); | |
1230 | } else | |
1231 | skb_shinfo(curr)->gso_size = 0; | |
9a72dd4d DS |
1232 | |
1233 | skb_push(curr, maclen); | |
1234 | skb_reset_mac_header(curr); | |
1235 | memcpy(skb_mac_header(curr), skb_mac_header(skb), | |
1236 | maclen); | |
1237 | curr->csum_start = skb_transport_header(curr) - curr->head; | |
1238 | if (ip_hdr(curr)->protocol == IPPROTO_TCP) | |
1239 | curr->csum_offset = offsetof(struct tcphdr, check); | |
1240 | else if (ip_hdr(curr)->protocol == IPPROTO_UDP) | |
1241 | curr->csum_offset = offsetof(struct udphdr, check); | |
1242 | ||
1243 | if (!(status & NETDEV_TX_MASK)) | |
1244 | status = vnet_start_xmit(curr, dev); | |
1245 | if (status & NETDEV_TX_MASK) | |
1246 | dev_kfree_skb_any(curr); | |
1247 | } | |
1248 | ||
1249 | if (!(status & NETDEV_TX_MASK)) | |
1250 | dev_kfree_skb_any(skb); | |
1251 | return status; | |
f7d70f74 DS |
1252 | out_dropped: |
1253 | dev->stats.tx_dropped++; | |
1254 | dev_kfree_skb_any(skb); | |
1255 | return NETDEV_TX_OK; | |
9a72dd4d DS |
1256 | } |
1257 | ||
4c521e42 DM |
1258 | static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
1259 | { | |
1260 | struct vnet *vp = netdev_priv(dev); | |
2a968dd8 | 1261 | struct vnet_port *port = NULL; |
4c521e42 DM |
1262 | struct vio_dring_state *dr; |
1263 | struct vio_net_desc *d; | |
4c521e42 | 1264 | unsigned int len; |
8e845f4c DS |
1265 | struct sk_buff *freeskbs = NULL; |
1266 | int i, err, txi; | |
8e845f4c | 1267 | unsigned pending = 0; |
d51bffd1 | 1268 | struct netdev_queue *txq; |
4c521e42 | 1269 | |
2a968dd8 | 1270 | rcu_read_lock(); |
13b13dd9 | 1271 | port = __tx_port_find(vp, skb); |
df20286a SV |
1272 | if (unlikely(!port)) { |
1273 | rcu_read_unlock(); | |
2a968dd8 | 1274 | goto out_dropped; |
df20286a | 1275 | } |
2a968dd8 | 1276 | |
368e36ed | 1277 | if (skb_is_gso(skb) && skb->len > port->tsolen) { |
9a72dd4d DS |
1278 | err = vnet_handle_offloads(port, skb); |
1279 | rcu_read_unlock(); | |
1280 | return err; | |
1281 | } | |
1282 | ||
368e36ed | 1283 | if (!skb_is_gso(skb) && skb->len > port->rmtu) { |
a2b78e9b DS |
1284 | unsigned long localmtu = port->rmtu - ETH_HLEN; |
1285 | ||
1286 | if (vio_version_after_eq(&port->vio, 1, 3)) | |
1287 | localmtu -= VLAN_HLEN; | |
1288 | ||
1289 | if (skb->protocol == htons(ETH_P_IP)) { | |
1290 | struct flowi4 fl4; | |
1291 | struct rtable *rt = NULL; | |
1292 | ||
1293 | memset(&fl4, 0, sizeof(fl4)); | |
1294 | fl4.flowi4_oif = dev->ifindex; | |
1295 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); | |
1296 | fl4.daddr = ip_hdr(skb)->daddr; | |
1297 | fl4.saddr = ip_hdr(skb)->saddr; | |
1298 | ||
1299 | rt = ip_route_output_key(dev_net(dev), &fl4); | |
2a968dd8 | 1300 | rcu_read_unlock(); |
a2b78e9b DS |
1301 | if (!IS_ERR(rt)) { |
1302 | skb_dst_set(skb, &rt->dst); | |
1303 | icmp_send(skb, ICMP_DEST_UNREACH, | |
1304 | ICMP_FRAG_NEEDED, | |
1305 | htonl(localmtu)); | |
1306 | } | |
1307 | } | |
1308 | #if IS_ENABLED(CONFIG_IPV6) | |
1309 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
1310 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu); | |
1311 | #endif | |
42db672d | 1312 | goto out_dropped; |
a2b78e9b | 1313 | } |
42db672d | 1314 | |
da38c564 DS |
1315 | skb = vnet_skb_shape(skb, 2); |
1316 | ||
9cdfe2c7 | 1317 | if (unlikely(!skb)) |
da38c564 | 1318 | goto out_dropped; |
da38c564 | 1319 | |
1b6b0a47 DS |
1320 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
1321 | vnet_fullcsum(skb); | |
1322 | ||
4c521e42 | 1323 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
d51bffd1 SV |
1324 | i = skb_get_queue_mapping(skb); |
1325 | txq = netdev_get_tx_queue(dev, i); | |
d0aedcd4 | 1326 | if (unlikely(vnet_tx_dring_avail(dr) < 1)) { |
d51bffd1 SV |
1327 | if (!netif_tx_queue_stopped(txq)) { |
1328 | netif_tx_stop_queue(txq); | |
4c521e42 DM |
1329 | |
1330 | /* This is a hard error, log it. */ | |
4d5870ec | 1331 | netdev_err(dev, "BUG! Tx Ring full when queue awake!\n"); |
4c521e42 DM |
1332 | dev->stats.tx_errors++; |
1333 | } | |
2a968dd8 | 1334 | rcu_read_unlock(); |
4c521e42 DM |
1335 | return NETDEV_TX_BUSY; |
1336 | } | |
1337 | ||
1338 | d = vio_dring_cur(dr); | |
1339 | ||
8e845f4c DS |
1340 | txi = dr->prod; |
1341 | ||
1342 | freeskbs = vnet_clean_tx_ring(port, &pending); | |
1343 | ||
1344 | BUG_ON(port->tx_bufs[txi].skb); | |
4c521e42 DM |
1345 | |
1346 | len = skb->len; | |
8e845f4c | 1347 | if (len < ETH_ZLEN) |
4c521e42 | 1348 | len = ETH_ZLEN; |
8e845f4c | 1349 | |
da38c564 DS |
1350 | err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2, |
1351 | (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW)); | |
8e845f4c DS |
1352 | if (err < 0) { |
1353 | netdev_info(dev, "tx buffer map error %d\n", err); | |
13b13dd9 | 1354 | goto out_dropped; |
4c521e42 | 1355 | } |
da38c564 DS |
1356 | |
1357 | port->tx_bufs[txi].skb = skb; | |
1358 | skb = NULL; | |
8e845f4c | 1359 | port->tx_bufs[txi].ncookies = err; |
4c521e42 | 1360 | |
1f6394e3 SV |
1361 | /* We don't rely on the ACKs to free the skb in vnet_start_xmit(), |
1362 | * thus it is safe to not set VIO_ACK_ENABLE for each transmission: | |
1363 | * the protocol itself does not require it as long as the peer | |
1364 | * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED. | |
1365 | * | |
1366 | * An ACK for every packet in the ring is expensive as the | |
1367 | * sending of LDC messages is slow and affects performance. | |
1368 | */ | |
1369 | d->hdr.ack = VIO_ACK_DISABLE; | |
4c521e42 | 1370 | d->size = len; |
8e845f4c | 1371 | d->ncookies = port->tx_bufs[txi].ncookies; |
4c521e42 | 1372 | for (i = 0; i < d->ncookies; i++) |
8e845f4c | 1373 | d->cookies[i] = port->tx_bufs[txi].cookies[i]; |
6d0ba919 DS |
1374 | if (vio_version_after_eq(&port->vio, 1, 7)) { |
1375 | struct vio_net_dext *dext = vio_net_ext(d); | |
1376 | ||
1377 | memset(dext, 0, sizeof(*dext)); | |
368e36ed DS |
1378 | if (skb_is_gso(port->tx_bufs[txi].skb)) { |
1379 | dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb) | |
1380 | ->gso_size; | |
1381 | dext->flags |= VNET_PKT_IPV4_LSO; | |
1382 | } | |
6d0ba919 DS |
1383 | if (vio_version_after_eq(&port->vio, 1, 8) && |
1384 | !port->switch_port) { | |
1385 | dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK; | |
1386 | dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK; | |
1387 | } | |
1388 | } | |
4c521e42 DM |
1389 | |
1390 | /* This has to be a non-SMP write barrier because we are writing | |
1391 | * to memory which is shared with the peer LDOM. | |
1392 | */ | |
b4468cc6 | 1393 | dma_wmb(); |
4c521e42 DM |
1394 | |
1395 | d->hdr.state = VIO_DESC_READY; | |
1396 | ||
d1015645 SV |
1397 | /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent |
1398 | * to notify the consumer that some descriptors are READY. | |
1399 | * After that "start" trigger, no additional triggers are needed until | |
1400 | * a DRING_STOPPED is received from the consumer. The dr->cons field | |
1401 | * (set up by vnet_ack()) has the value of the next dring index | |
1402 | * that has not yet been ack-ed. We send a "start" trigger here | |
1403 | * if, and only if, start_cons is true (reset it afterward). Conversely, | |
1404 | * vnet_ack() should check if the dring corresponding to cons | |
1405 | * is marked READY, but start_cons was false. | |
1406 | * If so, vnet_ack() should send out the missed "start" trigger. | |
1407 | * | |
b4468cc6 | 1408 | * Note that the dma_wmb() above makes sure the cookies et al. are |
d1015645 SV |
1409 | * not globally visible before the VIO_DESC_READY, and that the |
1410 | * stores are ordered correctly by the compiler. The consumer will | |
1411 | * not proceed until the VIO_DESC_READY is visible assuring that | |
1412 | * the consumer does not observe anything related to descriptors | |
1413 | * out of order. The HV trap from the LDC start trigger is the | |
1414 | * producer to consumer announcement that work is available to the | |
1415 | * consumer | |
1416 | */ | |
1417 | if (!port->start_cons) | |
1418 | goto ldc_start_done; /* previous trigger suffices */ | |
1419 | ||
1420 | err = __vnet_tx_trigger(port, dr->cons); | |
4c521e42 | 1421 | if (unlikely(err < 0)) { |
4d5870ec | 1422 | netdev_info(dev, "TX trigger error %d\n", err); |
4c521e42 | 1423 | d->hdr.state = VIO_DESC_FREE; |
bb39b743 DS |
1424 | skb = port->tx_bufs[txi].skb; |
1425 | port->tx_bufs[txi].skb = NULL; | |
4c521e42 | 1426 | dev->stats.tx_carrier_errors++; |
13b13dd9 | 1427 | goto out_dropped; |
4c521e42 DM |
1428 | } |
1429 | ||
d1015645 SV |
1430 | ldc_start_done: |
1431 | port->start_cons = false; | |
1432 | ||
4c521e42 | 1433 | dev->stats.tx_packets++; |
8e845f4c | 1434 | dev->stats.tx_bytes += port->tx_bufs[txi].skb->len; |
4c521e42 DM |
1435 | |
1436 | dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); | |
d0aedcd4 | 1437 | if (unlikely(vnet_tx_dring_avail(dr) < 1)) { |
d51bffd1 | 1438 | netif_tx_stop_queue(txq); |
4c521e42 | 1439 | if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) |
d51bffd1 | 1440 | netif_tx_wake_queue(txq); |
4c521e42 DM |
1441 | } |
1442 | ||
2a968dd8 SV |
1443 | (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT); |
1444 | rcu_read_unlock(); | |
4c521e42 | 1445 | |
8e845f4c DS |
1446 | vnet_free_skbs(freeskbs); |
1447 | ||
4c521e42 DM |
1448 | return NETDEV_TX_OK; |
1449 | ||
4c521e42 | 1450 | out_dropped: |
8e845f4c DS |
1451 | if (pending) |
1452 | (void)mod_timer(&port->clean_timer, | |
1453 | jiffies + VNET_CLEAN_TIMEOUT); | |
a29c9c43 | 1454 | else if (port) |
8e845f4c | 1455 | del_timer(&port->clean_timer); |
2a968dd8 SV |
1456 | if (port) |
1457 | rcu_read_unlock(); | |
1458 | if (skb) | |
1459 | dev_kfree_skb(skb); | |
1460 | vnet_free_skbs(freeskbs); | |
4c521e42 DM |
1461 | dev->stats.tx_dropped++; |
1462 | return NETDEV_TX_OK; | |
1463 | } | |
1464 | ||
1465 | static void vnet_tx_timeout(struct net_device *dev) | |
1466 | { | |
1467 | /* XXX Implement me XXX */ | |
1468 | } | |
1469 | ||
1470 | static int vnet_open(struct net_device *dev) | |
1471 | { | |
1472 | netif_carrier_on(dev); | |
d51bffd1 | 1473 | netif_tx_start_all_queues(dev); |
4c521e42 DM |
1474 | |
1475 | return 0; | |
1476 | } | |
1477 | ||
1478 | static int vnet_close(struct net_device *dev) | |
1479 | { | |
d51bffd1 | 1480 | netif_tx_stop_all_queues(dev); |
4c521e42 DM |
1481 | netif_carrier_off(dev); |
1482 | ||
1483 | return 0; | |
1484 | } | |
1485 | ||
028ebff2 DM |
1486 | static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr) |
1487 | { | |
1488 | struct vnet_mcast_entry *m; | |
1489 | ||
1490 | for (m = vp->mcast_list; m; m = m->next) { | |
00fa4ce9 | 1491 | if (ether_addr_equal(m->addr, addr)) |
028ebff2 DM |
1492 | return m; |
1493 | } | |
1494 | return NULL; | |
1495 | } | |
1496 | ||
1497 | static void __update_mc_list(struct vnet *vp, struct net_device *dev) | |
1498 | { | |
22bedad3 | 1499 | struct netdev_hw_addr *ha; |
028ebff2 | 1500 | |
22bedad3 | 1501 | netdev_for_each_mc_addr(ha, dev) { |
028ebff2 DM |
1502 | struct vnet_mcast_entry *m; |
1503 | ||
22bedad3 | 1504 | m = __vnet_mc_find(vp, ha->addr); |
028ebff2 DM |
1505 | if (m) { |
1506 | m->hit = 1; | |
1507 | continue; | |
1508 | } | |
1509 | ||
1510 | if (!m) { | |
1511 | m = kzalloc(sizeof(*m), GFP_ATOMIC); | |
1512 | if (!m) | |
1513 | continue; | |
22bedad3 | 1514 | memcpy(m->addr, ha->addr, ETH_ALEN); |
028ebff2 DM |
1515 | m->hit = 1; |
1516 | ||
1517 | m->next = vp->mcast_list; | |
1518 | vp->mcast_list = m; | |
1519 | } | |
1520 | } | |
1521 | } | |
1522 | ||
1523 | static void __send_mc_list(struct vnet *vp, struct vnet_port *port) | |
1524 | { | |
1525 | struct vio_net_mcast_info info; | |
1526 | struct vnet_mcast_entry *m, **pp; | |
1527 | int n_addrs; | |
1528 | ||
1529 | memset(&info, 0, sizeof(info)); | |
1530 | ||
1531 | info.tag.type = VIO_TYPE_CTRL; | |
1532 | info.tag.stype = VIO_SUBTYPE_INFO; | |
1533 | info.tag.stype_env = VNET_MCAST_INFO; | |
1534 | info.tag.sid = vio_send_sid(&port->vio); | |
1535 | info.set = 1; | |
1536 | ||
1537 | n_addrs = 0; | |
1538 | for (m = vp->mcast_list; m; m = m->next) { | |
1539 | if (m->sent) | |
1540 | continue; | |
1541 | m->sent = 1; | |
1542 | memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], | |
1543 | m->addr, ETH_ALEN); | |
1544 | if (++n_addrs == VNET_NUM_MCAST) { | |
1545 | info.count = n_addrs; | |
1546 | ||
1547 | (void) vio_ldc_send(&port->vio, &info, | |
1548 | sizeof(info)); | |
1549 | n_addrs = 0; | |
1550 | } | |
1551 | } | |
1552 | if (n_addrs) { | |
1553 | info.count = n_addrs; | |
1554 | (void) vio_ldc_send(&port->vio, &info, sizeof(info)); | |
1555 | } | |
1556 | ||
1557 | info.set = 0; | |
1558 | ||
1559 | n_addrs = 0; | |
1560 | pp = &vp->mcast_list; | |
1561 | while ((m = *pp) != NULL) { | |
1562 | if (m->hit) { | |
1563 | m->hit = 0; | |
1564 | pp = &m->next; | |
1565 | continue; | |
1566 | } | |
1567 | ||
1568 | memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], | |
1569 | m->addr, ETH_ALEN); | |
1570 | if (++n_addrs == VNET_NUM_MCAST) { | |
1571 | info.count = n_addrs; | |
1572 | (void) vio_ldc_send(&port->vio, &info, | |
1573 | sizeof(info)); | |
1574 | n_addrs = 0; | |
1575 | } | |
1576 | ||
1577 | *pp = m->next; | |
1578 | kfree(m); | |
1579 | } | |
1580 | if (n_addrs) { | |
1581 | info.count = n_addrs; | |
1582 | (void) vio_ldc_send(&port->vio, &info, sizeof(info)); | |
1583 | } | |
1584 | } | |
1585 | ||
4c521e42 DM |
1586 | static void vnet_set_rx_mode(struct net_device *dev) |
1587 | { | |
028ebff2 DM |
1588 | struct vnet *vp = netdev_priv(dev); |
1589 | struct vnet_port *port; | |
028ebff2 | 1590 | |
2a968dd8 SV |
1591 | rcu_read_lock(); |
1592 | list_for_each_entry_rcu(port, &vp->port_list, list) { | |
028ebff2 DM |
1593 | |
1594 | if (port->switch_port) { | |
1595 | __update_mc_list(vp, dev); | |
1596 | __send_mc_list(vp, port); | |
2a968dd8 | 1597 | break; |
028ebff2 DM |
1598 | } |
1599 | } | |
2a968dd8 | 1600 | rcu_read_unlock(); |
4c521e42 DM |
1601 | } |
1602 | ||
1603 | static int vnet_change_mtu(struct net_device *dev, int new_mtu) | |
1604 | { | |
42db672d | 1605 | if (new_mtu < 68 || new_mtu > 65535) |
4c521e42 DM |
1606 | return -EINVAL; |
1607 | ||
1608 | dev->mtu = new_mtu; | |
1609 | return 0; | |
1610 | } | |
1611 | ||
1612 | static int vnet_set_mac_addr(struct net_device *dev, void *p) | |
1613 | { | |
1614 | return -EINVAL; | |
1615 | } | |
1616 | ||
1617 | static void vnet_get_drvinfo(struct net_device *dev, | |
1618 | struct ethtool_drvinfo *info) | |
1619 | { | |
7826d43f JP |
1620 | strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); |
1621 | strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version)); | |
4c521e42 DM |
1622 | } |
1623 | ||
1624 | static u32 vnet_get_msglevel(struct net_device *dev) | |
1625 | { | |
1626 | struct vnet *vp = netdev_priv(dev); | |
1627 | return vp->msg_enable; | |
1628 | } | |
1629 | ||
1630 | static void vnet_set_msglevel(struct net_device *dev, u32 value) | |
1631 | { | |
1632 | struct vnet *vp = netdev_priv(dev); | |
1633 | vp->msg_enable = value; | |
1634 | } | |
1635 | ||
1636 | static const struct ethtool_ops vnet_ethtool_ops = { | |
1637 | .get_drvinfo = vnet_get_drvinfo, | |
1638 | .get_msglevel = vnet_get_msglevel, | |
1639 | .set_msglevel = vnet_set_msglevel, | |
1640 | .get_link = ethtool_op_get_link, | |
4c521e42 DM |
1641 | }; |
1642 | ||
1643 | static void vnet_port_free_tx_bufs(struct vnet_port *port) | |
1644 | { | |
1645 | struct vio_dring_state *dr; | |
1646 | int i; | |
1647 | ||
1648 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
07ac3e70 DS |
1649 | |
1650 | if (dr->base == NULL) | |
1651 | return; | |
4c521e42 DM |
1652 | |
1653 | for (i = 0; i < VNET_TX_RING_SIZE; i++) { | |
8e845f4c DS |
1654 | struct vio_net_desc *d; |
1655 | void *skb = port->tx_bufs[i].skb; | |
4c521e42 | 1656 | |
8e845f4c | 1657 | if (!skb) |
4c521e42 DM |
1658 | continue; |
1659 | ||
8e845f4c | 1660 | d = vio_dring_entry(dr, i); |
8e845f4c | 1661 | |
4c521e42 DM |
1662 | ldc_unmap(port->vio.lp, |
1663 | port->tx_bufs[i].cookies, | |
1664 | port->tx_bufs[i].ncookies); | |
8e845f4c DS |
1665 | dev_kfree_skb(skb); |
1666 | port->tx_bufs[i].skb = NULL; | |
1667 | d->hdr.state = VIO_DESC_FREE; | |
4c521e42 | 1668 | } |
07ac3e70 DS |
1669 | ldc_free_exp_dring(port->vio.lp, dr->base, |
1670 | (dr->entry_size * dr->num_entries), | |
1671 | dr->cookies, dr->ncookies); | |
1672 | dr->base = NULL; | |
1673 | dr->entry_size = 0; | |
1674 | dr->num_entries = 0; | |
1675 | dr->pending = 0; | |
1676 | dr->ncookies = 0; | |
4c521e42 DM |
1677 | } |
1678 | ||
8e2b60cd DS |
1679 | static void vnet_port_reset(struct vnet_port *port) |
1680 | { | |
1681 | del_timer(&port->clean_timer); | |
1682 | vnet_port_free_tx_bufs(port); | |
1683 | port->rmtu = 0; | |
1684 | port->tso = true; | |
1685 | port->tsolen = 0; | |
1686 | } | |
1687 | ||
d6732489 | 1688 | static int vnet_port_alloc_tx_ring(struct vnet_port *port) |
4c521e42 DM |
1689 | { |
1690 | struct vio_dring_state *dr; | |
6d0ba919 | 1691 | unsigned long len, elen; |
4c521e42 DM |
1692 | int i, err, ncookies; |
1693 | void *dring; | |
1694 | ||
4c521e42 DM |
1695 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
1696 | ||
6d0ba919 DS |
1697 | elen = sizeof(struct vio_net_desc) + |
1698 | sizeof(struct ldc_trans_cookie) * 2; | |
1699 | if (vio_version_after_eq(&port->vio, 1, 7)) | |
1700 | elen += sizeof(struct vio_net_dext); | |
1701 | len = VNET_TX_RING_SIZE * elen; | |
4c521e42 DM |
1702 | |
1703 | ncookies = VIO_MAX_RING_COOKIES; | |
1704 | dring = ldc_alloc_exp_dring(port->vio.lp, len, | |
1705 | dr->cookies, &ncookies, | |
1706 | (LDC_MAP_SHADOW | | |
1707 | LDC_MAP_DIRECT | | |
1708 | LDC_MAP_RW)); | |
1709 | if (IS_ERR(dring)) { | |
1710 | err = PTR_ERR(dring); | |
1711 | goto err_out; | |
1712 | } | |
1713 | ||
1714 | dr->base = dring; | |
6d0ba919 | 1715 | dr->entry_size = elen; |
4c521e42 DM |
1716 | dr->num_entries = VNET_TX_RING_SIZE; |
1717 | dr->prod = dr->cons = 0; | |
d1015645 | 1718 | port->start_cons = true; /* need an initial trigger */ |
4c521e42 DM |
1719 | dr->pending = VNET_TX_RING_SIZE; |
1720 | dr->ncookies = ncookies; | |
1721 | ||
8e845f4c DS |
1722 | for (i = 0; i < VNET_TX_RING_SIZE; ++i) { |
1723 | struct vio_net_desc *d; | |
1724 | ||
1725 | d = vio_dring_entry(dr, i); | |
1726 | d->hdr.state = VIO_DESC_FREE; | |
1727 | } | |
4c521e42 DM |
1728 | return 0; |
1729 | ||
1730 | err_out: | |
1731 | vnet_port_free_tx_bufs(port); | |
1732 | ||
1733 | return err; | |
1734 | } | |
1735 | ||
69088822 SV |
1736 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1737 | static void vnet_poll_controller(struct net_device *dev) | |
1738 | { | |
1739 | struct vnet *vp = netdev_priv(dev); | |
1740 | struct vnet_port *port; | |
1741 | unsigned long flags; | |
1742 | ||
1743 | spin_lock_irqsave(&vp->lock, flags); | |
1744 | if (!list_empty(&vp->port_list)) { | |
1745 | port = list_entry(vp->port_list.next, struct vnet_port, list); | |
1746 | napi_schedule(&port->napi); | |
1747 | } | |
1748 | spin_unlock_irqrestore(&vp->lock, flags); | |
1749 | } | |
1750 | #endif | |
9184a046 DM |
1751 | static LIST_HEAD(vnet_list); |
1752 | static DEFINE_MUTEX(vnet_list_mutex); | |
1753 | ||
8fd17f2e DM |
1754 | static const struct net_device_ops vnet_ops = { |
1755 | .ndo_open = vnet_open, | |
1756 | .ndo_stop = vnet_close, | |
afc4b13d | 1757 | .ndo_set_rx_mode = vnet_set_rx_mode, |
8fd17f2e | 1758 | .ndo_set_mac_address = vnet_set_mac_addr, |
240c102d | 1759 | .ndo_validate_addr = eth_validate_addr, |
8fd17f2e DM |
1760 | .ndo_tx_timeout = vnet_tx_timeout, |
1761 | .ndo_change_mtu = vnet_change_mtu, | |
1762 | .ndo_start_xmit = vnet_start_xmit, | |
d51bffd1 | 1763 | .ndo_select_queue = vnet_select_queue, |
69088822 SV |
1764 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1765 | .ndo_poll_controller = vnet_poll_controller, | |
1766 | #endif | |
8fd17f2e DM |
1767 | }; |
1768 | ||
4c5d283a SV |
1769 | static struct vnet *vnet_new(const u64 *local_mac, |
1770 | struct vio_dev *vdev) | |
9184a046 DM |
1771 | { |
1772 | struct net_device *dev; | |
1773 | struct vnet *vp; | |
1774 | int err, i; | |
1775 | ||
d51bffd1 | 1776 | dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1); |
41de8d4c | 1777 | if (!dev) |
9184a046 | 1778 | return ERR_PTR(-ENOMEM); |
8e845f4c DS |
1779 | dev->needed_headroom = VNET_PACKET_SKIP + 8; |
1780 | dev->needed_tailroom = 8; | |
9184a046 DM |
1781 | |
1782 | for (i = 0; i < ETH_ALEN; i++) | |
1783 | dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff; | |
1784 | ||
9184a046 DM |
1785 | vp = netdev_priv(dev); |
1786 | ||
1787 | spin_lock_init(&vp->lock); | |
1788 | vp->dev = dev; | |
1789 | ||
1790 | INIT_LIST_HEAD(&vp->port_list); | |
1791 | for (i = 0; i < VNET_PORT_HASH_SIZE; i++) | |
1792 | INIT_HLIST_HEAD(&vp->port_hash[i]); | |
1793 | INIT_LIST_HEAD(&vp->list); | |
1794 | vp->local_mac = *local_mac; | |
1795 | ||
8fd17f2e | 1796 | dev->netdev_ops = &vnet_ops; |
9184a046 DM |
1797 | dev->ethtool_ops = &vnet_ethtool_ops; |
1798 | dev->watchdog_timeo = VNET_TX_TIMEOUT; | |
9184a046 | 1799 | |
368e36ed | 1800 | dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE | |
9a72dd4d | 1801 | NETIF_F_HW_CSUM | NETIF_F_SG; |
da38c564 DS |
1802 | dev->features = dev->hw_features; |
1803 | ||
4c5d283a SV |
1804 | SET_NETDEV_DEV(dev, &vdev->dev); |
1805 | ||
9184a046 DM |
1806 | err = register_netdev(dev); |
1807 | if (err) { | |
4d5870ec | 1808 | pr_err("Cannot register net device, aborting\n"); |
9184a046 DM |
1809 | goto err_out_free_dev; |
1810 | } | |
1811 | ||
4d5870ec | 1812 | netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr); |
9184a046 DM |
1813 | |
1814 | list_add(&vp->list, &vnet_list); | |
1815 | ||
1816 | return vp; | |
1817 | ||
1818 | err_out_free_dev: | |
1819 | free_netdev(dev); | |
1820 | ||
1821 | return ERR_PTR(err); | |
1822 | } | |
1823 | ||
4c5d283a SV |
1824 | static struct vnet *vnet_find_or_create(const u64 *local_mac, |
1825 | struct vio_dev *vdev) | |
9184a046 DM |
1826 | { |
1827 | struct vnet *iter, *vp; | |
1828 | ||
1829 | mutex_lock(&vnet_list_mutex); | |
1830 | vp = NULL; | |
1831 | list_for_each_entry(iter, &vnet_list, list) { | |
1832 | if (iter->local_mac == *local_mac) { | |
1833 | vp = iter; | |
1834 | break; | |
1835 | } | |
1836 | } | |
1837 | if (!vp) | |
4c5d283a | 1838 | vp = vnet_new(local_mac, vdev); |
9184a046 DM |
1839 | mutex_unlock(&vnet_list_mutex); |
1840 | ||
1841 | return vp; | |
1842 | } | |
1843 | ||
a4b70a07 SV |
1844 | static void vnet_cleanup(void) |
1845 | { | |
1846 | struct vnet *vp; | |
1847 | struct net_device *dev; | |
1848 | ||
1849 | mutex_lock(&vnet_list_mutex); | |
1850 | while (!list_empty(&vnet_list)) { | |
1851 | vp = list_first_entry(&vnet_list, struct vnet, list); | |
1852 | list_del(&vp->list); | |
1853 | dev = vp->dev; | |
1854 | /* vio_unregister_driver() should have cleaned up port_list */ | |
1855 | BUG_ON(!list_empty(&vp->port_list)); | |
1856 | unregister_netdev(dev); | |
1857 | free_netdev(dev); | |
1858 | } | |
1859 | mutex_unlock(&vnet_list_mutex); | |
1860 | } | |
1861 | ||
9184a046 DM |
1862 | static const char *local_mac_prop = "local-mac-address"; |
1863 | ||
f73d12bd | 1864 | static struct vnet *vnet_find_parent(struct mdesc_handle *hp, |
4c5d283a SV |
1865 | u64 port_node, |
1866 | struct vio_dev *vdev) | |
9184a046 DM |
1867 | { |
1868 | const u64 *local_mac = NULL; | |
1869 | u64 a; | |
1870 | ||
1871 | mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { | |
1872 | u64 target = mdesc_arc_target(hp, a); | |
1873 | const char *name; | |
1874 | ||
1875 | name = mdesc_get_property(hp, target, "name", NULL); | |
1876 | if (!name || strcmp(name, "network")) | |
1877 | continue; | |
1878 | ||
1879 | local_mac = mdesc_get_property(hp, target, | |
1880 | local_mac_prop, NULL); | |
1881 | if (local_mac) | |
1882 | break; | |
1883 | } | |
1884 | if (!local_mac) | |
1885 | return ERR_PTR(-ENODEV); | |
1886 | ||
4c5d283a | 1887 | return vnet_find_or_create(local_mac, vdev); |
9184a046 DM |
1888 | } |
1889 | ||
4c521e42 DM |
1890 | static struct ldc_channel_config vnet_ldc_cfg = { |
1891 | .event = vnet_event, | |
1892 | .mtu = 64, | |
1893 | .mode = LDC_MODE_UNRELIABLE, | |
1894 | }; | |
1895 | ||
1896 | static struct vio_driver_ops vnet_vio_ops = { | |
1897 | .send_attr = vnet_send_attr, | |
1898 | .handle_attr = vnet_handle_attr, | |
1899 | .handshake_complete = vnet_handshake_complete, | |
1900 | }; | |
1901 | ||
f73d12bd | 1902 | static void print_version(void) |
9184a046 | 1903 | { |
4d5870ec | 1904 | printk_once(KERN_INFO "%s", version); |
9184a046 DM |
1905 | } |
1906 | ||
4c521e42 DM |
1907 | const char *remote_macaddr_prop = "remote-mac-address"; |
1908 | ||
d51bffd1 SV |
1909 | static void |
1910 | vnet_port_add_txq(struct vnet_port *port) | |
1911 | { | |
1912 | struct vnet *vp = port->vp; | |
1913 | int n; | |
1914 | ||
1915 | n = vp->nports++; | |
1916 | n = n & (VNET_MAX_TXQS - 1); | |
1917 | port->q_index = n; | |
1918 | netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index)); | |
1919 | } | |
1920 | ||
1921 | static void | |
1922 | vnet_port_rm_txq(struct vnet_port *port) | |
1923 | { | |
1924 | port->vp->nports--; | |
1925 | netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index)); | |
1926 | } | |
1927 | ||
1dd06ae8 | 1928 | static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
4c521e42 | 1929 | { |
43fdf274 | 1930 | struct mdesc_handle *hp; |
4c521e42 DM |
1931 | struct vnet_port *port; |
1932 | unsigned long flags; | |
1933 | struct vnet *vp; | |
1934 | const u64 *rmac; | |
1935 | int len, i, err, switch_port; | |
1936 | ||
9184a046 | 1937 | print_version(); |
4c521e42 | 1938 | |
43fdf274 DM |
1939 | hp = mdesc_grab(); |
1940 | ||
4c5d283a | 1941 | vp = vnet_find_parent(hp, vdev->mp, vdev); |
9184a046 | 1942 | if (IS_ERR(vp)) { |
4d5870ec | 1943 | pr_err("Cannot find port parent vnet\n"); |
9184a046 DM |
1944 | err = PTR_ERR(vp); |
1945 | goto err_out_put_mdesc; | |
1946 | } | |
1947 | ||
43fdf274 DM |
1948 | rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); |
1949 | err = -ENODEV; | |
4c521e42 | 1950 | if (!rmac) { |
4d5870ec | 1951 | pr_err("Port lacks %s property\n", remote_macaddr_prop); |
43fdf274 | 1952 | goto err_out_put_mdesc; |
4c521e42 DM |
1953 | } |
1954 | ||
1955 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
43fdf274 | 1956 | err = -ENOMEM; |
e404decb | 1957 | if (!port) |
43fdf274 | 1958 | goto err_out_put_mdesc; |
4c521e42 DM |
1959 | |
1960 | for (i = 0; i < ETH_ALEN; i++) | |
1961 | port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; | |
1962 | ||
1963 | port->vp = vp; | |
1964 | ||
43fdf274 | 1965 | err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, |
4c521e42 DM |
1966 | vnet_versions, ARRAY_SIZE(vnet_versions), |
1967 | &vnet_vio_ops, vp->dev->name); | |
1968 | if (err) | |
1969 | goto err_out_free_port; | |
1970 | ||
1971 | err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port); | |
1972 | if (err) | |
1973 | goto err_out_free_port; | |
1974 | ||
69088822 SV |
1975 | netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT); |
1976 | ||
4c521e42 DM |
1977 | INIT_HLIST_NODE(&port->hash); |
1978 | INIT_LIST_HEAD(&port->list); | |
1979 | ||
1980 | switch_port = 0; | |
43fdf274 | 1981 | if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL) |
4c521e42 | 1982 | switch_port = 1; |
028ebff2 | 1983 | port->switch_port = switch_port; |
368e36ed DS |
1984 | port->tso = true; |
1985 | port->tsolen = 0; | |
4c521e42 DM |
1986 | |
1987 | spin_lock_irqsave(&vp->lock, flags); | |
1988 | if (switch_port) | |
2a968dd8 | 1989 | list_add_rcu(&port->list, &vp->port_list); |
4c521e42 | 1990 | else |
2a968dd8 SV |
1991 | list_add_tail_rcu(&port->list, &vp->port_list); |
1992 | hlist_add_head_rcu(&port->hash, | |
1993 | &vp->port_hash[vnet_hashfn(port->raddr)]); | |
d51bffd1 | 1994 | vnet_port_add_txq(port); |
4c521e42 DM |
1995 | spin_unlock_irqrestore(&vp->lock, flags); |
1996 | ||
1997 | dev_set_drvdata(&vdev->dev, port); | |
1998 | ||
4d5870ec JP |
1999 | pr_info("%s: PORT ( remote-mac %pM%s )\n", |
2000 | vp->dev->name, port->raddr, switch_port ? " switch-port" : ""); | |
4c521e42 | 2001 | |
8e845f4c DS |
2002 | setup_timer(&port->clean_timer, vnet_clean_timer_expire, |
2003 | (unsigned long)port); | |
2004 | ||
69088822 | 2005 | napi_enable(&port->napi); |
4c521e42 DM |
2006 | vio_port_up(&port->vio); |
2007 | ||
43fdf274 DM |
2008 | mdesc_release(hp); |
2009 | ||
4c521e42 DM |
2010 | return 0; |
2011 | ||
4c521e42 DM |
2012 | err_out_free_port: |
2013 | kfree(port); | |
2014 | ||
43fdf274 DM |
2015 | err_out_put_mdesc: |
2016 | mdesc_release(hp); | |
4c521e42 DM |
2017 | return err; |
2018 | } | |
2019 | ||
2020 | static int vnet_port_remove(struct vio_dev *vdev) | |
2021 | { | |
2022 | struct vnet_port *port = dev_get_drvdata(&vdev->dev); | |
2023 | ||
2024 | if (port) { | |
4c521e42 DM |
2025 | |
2026 | del_timer_sync(&port->vio.timer); | |
2027 | ||
69088822 | 2028 | napi_disable(&port->napi); |
4c521e42 | 2029 | |
2a968dd8 SV |
2030 | list_del_rcu(&port->list); |
2031 | hlist_del_rcu(&port->hash); | |
2032 | ||
2033 | synchronize_rcu(); | |
2034 | del_timer_sync(&port->clean_timer); | |
d51bffd1 | 2035 | vnet_port_rm_txq(port); |
69088822 | 2036 | netif_napi_del(&port->napi); |
4c521e42 DM |
2037 | vnet_port_free_tx_bufs(port); |
2038 | vio_ldc_free(&port->vio); | |
2039 | ||
2040 | dev_set_drvdata(&vdev->dev, NULL); | |
2041 | ||
2042 | kfree(port); | |
aabb9875 | 2043 | |
4c521e42 DM |
2044 | } |
2045 | return 0; | |
2046 | } | |
2047 | ||
3d452e55 | 2048 | static const struct vio_device_id vnet_port_match[] = { |
4c521e42 DM |
2049 | { |
2050 | .type = "vnet-port", | |
2051 | }, | |
2052 | {}, | |
2053 | }; | |
da68e081 | 2054 | MODULE_DEVICE_TABLE(vio, vnet_port_match); |
4c521e42 DM |
2055 | |
2056 | static struct vio_driver vnet_port_driver = { | |
2057 | .id_table = vnet_port_match, | |
2058 | .probe = vnet_port_probe, | |
2059 | .remove = vnet_port_remove, | |
cb52d897 | 2060 | .name = "vnet_port", |
4c521e42 DM |
2061 | }; |
2062 | ||
4c521e42 DM |
2063 | static int __init vnet_init(void) |
2064 | { | |
9184a046 | 2065 | return vio_register_driver(&vnet_port_driver); |
4c521e42 DM |
2066 | } |
2067 | ||
2068 | static void __exit vnet_exit(void) | |
2069 | { | |
2070 | vio_unregister_driver(&vnet_port_driver); | |
a4b70a07 | 2071 | vnet_cleanup(); |
4c521e42 DM |
2072 | } |
2073 | ||
2074 | module_init(vnet_init); | |
2075 | module_exit(vnet_exit); |