Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/net/ethernet/sun/sunvnet.c

  1 /* sunvnet.c: Sun LDOM Virtual Network Driver.
  2  *
  3  * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
  4  */
  5 
  6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  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 
 19 #include <asm/vio.h>
 20 #include <asm/ldc.h>
 21 
 22 #include "sunvnet.h"
 23 
 24 #define DRV_MODULE_NAME         "sunvnet"
 25 #define DRV_MODULE_VERSION      "1.0"
 26 #define DRV_MODULE_RELDATE      "June 25, 2007"
 27 
 28 static char version[] =
 29         DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
 30 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
 31 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
 32 MODULE_LICENSE("GPL");
 33 MODULE_VERSION(DRV_MODULE_VERSION);
 34 
 35 /* Ordered from largest major to lowest */
 36 static struct vio_version vnet_versions[] = {
 37         { .major = 1, .minor = 0 },
 38 };
 39 
 40 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
 41 {
 42         return vio_dring_avail(dr, VNET_TX_RING_SIZE);
 43 }
 44 
 45 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
 46 {
 47         struct vio_msg_tag *pkt = arg;
 48 
 49         pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
 50                pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
 51         pr_err("Resetting connection\n");
 52 
 53         ldc_disconnect(port->vio.lp);
 54 
 55         return -ECONNRESET;
 56 }
 57 
 58 static int vnet_send_attr(struct vio_driver_state *vio)
 59 {
 60         struct vnet_port *port = to_vnet_port(vio);
 61         struct net_device *dev = port->vp->dev;
 62         struct vio_net_attr_info pkt;
 63         int i;
 64 
 65         memset(&pkt, 0, sizeof(pkt));
 66         pkt.tag.type = VIO_TYPE_CTRL;
 67         pkt.tag.stype = VIO_SUBTYPE_INFO;
 68         pkt.tag.stype_env = VIO_ATTR_INFO;
 69         pkt.tag.sid = vio_send_sid(vio);
 70         pkt.xfer_mode = VIO_DRING_MODE;
 71         pkt.addr_type = VNET_ADDR_ETHERMAC;
 72         pkt.ack_freq = 0;
 73         for (i = 0; i < 6; i++)
 74                 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
 75         pkt.mtu = ETH_FRAME_LEN;
 76 
 77         viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
 78                "ackfreq[%u] mtu[%llu]\n",
 79                pkt.xfer_mode, pkt.addr_type,
 80                (unsigned long long) pkt.addr,
 81                pkt.ack_freq,
 82                (unsigned long long) pkt.mtu);
 83 
 84         return vio_ldc_send(vio, &pkt, sizeof(pkt));
 85 }
 86 
 87 static int handle_attr_info(struct vio_driver_state *vio,
 88                             struct vio_net_attr_info *pkt)
 89 {
 90         viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
 91                "ackfreq[%u] mtu[%llu]\n",
 92                pkt->xfer_mode, pkt->addr_type,
 93                (unsigned long long) pkt->addr,
 94                pkt->ack_freq,
 95                (unsigned long long) pkt->mtu);
 96 
 97         pkt->tag.sid = vio_send_sid(vio);
 98 
 99         if (pkt->xfer_mode != VIO_DRING_MODE ||
100             pkt->addr_type != VNET_ADDR_ETHERMAC ||
101             pkt->mtu != ETH_FRAME_LEN) {
102                 viodbg(HS, "SEND NET ATTR NACK\n");
103 
104                 pkt->tag.stype = VIO_SUBTYPE_NACK;
105 
106                 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
107 
108                 return -ECONNRESET;
109         } else {
110                 viodbg(HS, "SEND NET ATTR ACK\n");
111 
112                 pkt->tag.stype = VIO_SUBTYPE_ACK;
113 
114                 return vio_ldc_send(vio, pkt, sizeof(*pkt));
115         }
116 
117 }
118 
119 static int handle_attr_ack(struct vio_driver_state *vio,
120                            struct vio_net_attr_info *pkt)
121 {
122         viodbg(HS, "GOT NET ATTR ACK\n");
123 
124         return 0;
125 }
126 
127 static int handle_attr_nack(struct vio_driver_state *vio,
128                             struct vio_net_attr_info *pkt)
129 {
130         viodbg(HS, "GOT NET ATTR NACK\n");
131 
132         return -ECONNRESET;
133 }
134 
135 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
136 {
137         struct vio_net_attr_info *pkt = arg;
138 
139         switch (pkt->tag.stype) {
140         case VIO_SUBTYPE_INFO:
141                 return handle_attr_info(vio, pkt);
142 
143         case VIO_SUBTYPE_ACK:
144                 return handle_attr_ack(vio, pkt);
145 
146         case VIO_SUBTYPE_NACK:
147                 return handle_attr_nack(vio, pkt);
148 
149         default:
150                 return -ECONNRESET;
151         }
152 }
153 
154 static void vnet_handshake_complete(struct vio_driver_state *vio)
155 {
156         struct vio_dring_state *dr;
157 
158         dr = &vio->drings[VIO_DRIVER_RX_RING];
159         dr->snd_nxt = dr->rcv_nxt = 1;
160 
161         dr = &vio->drings[VIO_DRIVER_TX_RING];
162         dr->snd_nxt = dr->rcv_nxt = 1;
163 }
164 
165 /* The hypervisor interface that implements copying to/from imported
166  * memory from another domain requires that copies are done to 8-byte
167  * aligned buffers, and that the lengths of such copies are also 8-byte
168  * multiples.
169  *
170  * So we align skb->data to an 8-byte multiple and pad-out the data
171  * area so we can round the copy length up to the next multiple of
172  * 8 for the copy.
173  *
174  * The transmitter puts the actual start of the packet 6 bytes into
175  * the buffer it sends over, so that the IP headers after the ethernet
176  * header are aligned properly.  These 6 bytes are not in the descriptor
177  * length, they are simply implied.  This offset is represented using
178  * the VNET_PACKET_SKIP macro.
179  */
180 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
181                                            unsigned int len)
182 {
183         struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
184         unsigned long addr, off;
185 
186         if (unlikely(!skb))
187                 return NULL;
188 
189         addr = (unsigned long) skb->data;
190         off = ((addr + 7UL) & ~7UL) - addr;
191         if (off)
192                 skb_reserve(skb, off);
193 
194         return skb;
195 }
196 
197 static int vnet_rx_one(struct vnet_port *port, unsigned int len,
198                        struct ldc_trans_cookie *cookies, int ncookies)
199 {
200         struct net_device *dev = port->vp->dev;
201         unsigned int copy_len;
202         struct sk_buff *skb;
203         int err;
204 
205         err = -EMSGSIZE;
206         if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
207                 dev->stats.rx_length_errors++;
208                 goto out_dropped;
209         }
210 
211         skb = alloc_and_align_skb(dev, len);
212         err = -ENOMEM;
213         if (unlikely(!skb)) {
214                 dev->stats.rx_missed_errors++;
215                 goto out_dropped;
216         }
217 
218         copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
219         skb_put(skb, copy_len);
220         err = ldc_copy(port->vio.lp, LDC_COPY_IN,
221                        skb->data, copy_len, 0,
222                        cookies, ncookies);
223         if (unlikely(err < 0)) {
224                 dev->stats.rx_frame_errors++;
225                 goto out_free_skb;
226         }
227 
228         skb_pull(skb, VNET_PACKET_SKIP);
229         skb_trim(skb, len);
230         skb->protocol = eth_type_trans(skb, dev);
231 
232         dev->stats.rx_packets++;
233         dev->stats.rx_bytes += len;
234 
235         netif_rx(skb);
236 
237         return 0;
238 
239 out_free_skb:
240         kfree_skb(skb);
241 
242 out_dropped:
243         dev->stats.rx_dropped++;
244         return err;
245 }
246 
247 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
248                          u32 start, u32 end, u8 vio_dring_state)
249 {
250         struct vio_dring_data hdr = {
251                 .tag = {
252                         .type           = VIO_TYPE_DATA,
253                         .stype          = VIO_SUBTYPE_ACK,
254                         .stype_env      = VIO_DRING_DATA,
255                         .sid            = vio_send_sid(&port->vio),
256                 },
257                 .dring_ident            = dr->ident,
258                 .start_idx              = start,
259                 .end_idx                = end,
260                 .state                  = vio_dring_state,
261         };
262         int err, delay;
263 
264         hdr.seq = dr->snd_nxt;
265         delay = 1;
266         do {
267                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
268                 if (err > 0) {
269                         dr->snd_nxt++;
270                         break;
271                 }
272                 udelay(delay);
273                 if ((delay <<= 1) > 128)
274                         delay = 128;
275         } while (err == -EAGAIN);
276 
277         return err;
278 }
279 
280 static u32 next_idx(u32 idx, struct vio_dring_state *dr)
281 {
282         if (++idx == dr->num_entries)
283                 idx = 0;
284         return idx;
285 }
286 
287 static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
288 {
289         if (idx == 0)
290                 idx = dr->num_entries - 1;
291         else
292                 idx--;
293 
294         return idx;
295 }
296 
297 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
298                                         struct vio_dring_state *dr,
299                                         u32 index)
300 {
301         struct vio_net_desc *desc = port->vio.desc_buf;
302         int err;
303 
304         err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
305                                   (index * dr->entry_size),
306                                   dr->cookies, dr->ncookies);
307         if (err < 0)
308                 return ERR_PTR(err);
309 
310         return desc;
311 }
312 
313 static int put_rx_desc(struct vnet_port *port,
314                        struct vio_dring_state *dr,
315                        struct vio_net_desc *desc,
316                        u32 index)
317 {
318         int err;
319 
320         err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
321                                   (index * dr->entry_size),
322                                   dr->cookies, dr->ncookies);
323         if (err < 0)
324                 return err;
325 
326         return 0;
327 }
328 
329 static int vnet_walk_rx_one(struct vnet_port *port,
330                             struct vio_dring_state *dr,
331                             u32 index, int *needs_ack)
332 {
333         struct vio_net_desc *desc = get_rx_desc(port, dr, index);
334         struct vio_driver_state *vio = &port->vio;
335         int err;
336 
337         if (IS_ERR(desc))
338                 return PTR_ERR(desc);
339 
340         viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
341                desc->hdr.state, desc->hdr.ack,
342                desc->size, desc->ncookies,
343                desc->cookies[0].cookie_addr,
344                desc->cookies[0].cookie_size);
345 
346         if (desc->hdr.state != VIO_DESC_READY)
347                 return 1;
348         err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
349         if (err == -ECONNRESET)
350                 return err;
351         desc->hdr.state = VIO_DESC_DONE;
352         err = put_rx_desc(port, dr, desc, index);
353         if (err < 0)
354                 return err;
355         *needs_ack = desc->hdr.ack;
356         return 0;
357 }
358 
359 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
360                         u32 start, u32 end)
361 {
362         struct vio_driver_state *vio = &port->vio;
363         int ack_start = -1, ack_end = -1;
364 
365         end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
366 
367         viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
368 
369         while (start != end) {
370                 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
371                 if (err == -ECONNRESET)
372                         return err;
373                 if (err != 0)
374                         break;
375                 if (ack_start == -1)
376                         ack_start = start;
377                 ack_end = start;
378                 start = next_idx(start, dr);
379                 if (ack && start != end) {
380                         err = vnet_send_ack(port, dr, ack_start, ack_end,
381                                             VIO_DRING_ACTIVE);
382                         if (err == -ECONNRESET)
383                                 return err;
384                         ack_start = -1;
385                 }
386         }
387         if (unlikely(ack_start == -1))
388                 ack_start = ack_end = prev_idx(start, dr);
389         return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
390 }
391 
392 static int vnet_rx(struct vnet_port *port, void *msgbuf)
393 {
394         struct vio_dring_data *pkt = msgbuf;
395         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
396         struct vio_driver_state *vio = &port->vio;
397 
398         viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
399                pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
400 
401         if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
402                 return 0;
403         if (unlikely(pkt->seq != dr->rcv_nxt)) {
404                 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
405                        pkt->seq, dr->rcv_nxt);
406                 return 0;
407         }
408 
409         dr->rcv_nxt++;
410 
411         /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
412 
413         return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
414 }
415 
416 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
417 {
418         u32 idx = dr->cons;
419         int found = 0;
420 
421         while (idx != dr->prod) {
422                 if (idx == end) {
423                         found = 1;
424                         break;
425                 }
426                 idx = next_idx(idx, dr);
427         }
428         return found;
429 }
430 
431 static int vnet_ack(struct vnet_port *port, void *msgbuf)
432 {
433         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
434         struct vio_dring_data *pkt = msgbuf;
435         struct net_device *dev;
436         struct vnet *vp;
437         u32 end;
438 
439         if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
440                 return 0;
441 
442         end = pkt->end_idx;
443         if (unlikely(!idx_is_pending(dr, end)))
444                 return 0;
445 
446         dr->cons = next_idx(end, dr);
447 
448         vp = port->vp;
449         dev = vp->dev;
450         if (unlikely(netif_queue_stopped(dev) &&
451                      vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
452                 return 1;
453 
454         return 0;
455 }
456 
457 static int vnet_nack(struct vnet_port *port, void *msgbuf)
458 {
459         /* XXX just reset or similar XXX */
460         return 0;
461 }
462 
463 static int handle_mcast(struct vnet_port *port, void *msgbuf)
464 {
465         struct vio_net_mcast_info *pkt = msgbuf;
466 
467         if (pkt->tag.stype != VIO_SUBTYPE_ACK)
468                 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
469                        port->vp->dev->name,
470                        pkt->tag.type,
471                        pkt->tag.stype,
472                        pkt->tag.stype_env,
473                        pkt->tag.sid);
474 
475         return 0;
476 }
477 
478 static void maybe_tx_wakeup(struct vnet *vp)
479 {
480         struct net_device *dev = vp->dev;
481 
482         netif_tx_lock(dev);
483         if (likely(netif_queue_stopped(dev))) {
484                 struct vnet_port *port;
485                 int wake = 1;
486 
487                 list_for_each_entry(port, &vp->port_list, list) {
488                         struct vio_dring_state *dr;
489 
490                         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
491                         if (vnet_tx_dring_avail(dr) <
492                             VNET_TX_WAKEUP_THRESH(dr)) {
493                                 wake = 0;
494                                 break;
495                         }
496                 }
497                 if (wake)
498                         netif_wake_queue(dev);
499         }
500         netif_tx_unlock(dev);
501 }
502 
503 static void vnet_event(void *arg, int event)
504 {
505         struct vnet_port *port = arg;
506         struct vio_driver_state *vio = &port->vio;
507         unsigned long flags;
508         int tx_wakeup, err;
509 
510         spin_lock_irqsave(&vio->lock, flags);
511 
512         if (unlikely(event == LDC_EVENT_RESET ||
513                      event == LDC_EVENT_UP)) {
514                 vio_link_state_change(vio, event);
515                 spin_unlock_irqrestore(&vio->lock, flags);
516 
517                 if (event == LDC_EVENT_RESET)
518                         vio_port_up(vio);
519                 return;
520         }
521 
522         if (unlikely(event != LDC_EVENT_DATA_READY)) {
523                 pr_warning("Unexpected LDC event %d\n", event);
524                 spin_unlock_irqrestore(&vio->lock, flags);
525                 return;
526         }
527 
528         tx_wakeup = err = 0;
529         while (1) {
530                 union {
531                         struct vio_msg_tag tag;
532                         u64 raw[8];
533                 } msgbuf;
534 
535                 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
536                 if (unlikely(err < 0)) {
537                         if (err == -ECONNRESET)
538                                 vio_conn_reset(vio);
539                         break;
540                 }
541                 if (err == 0)
542                         break;
543                 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
544                        msgbuf.tag.type,
545                        msgbuf.tag.stype,
546                        msgbuf.tag.stype_env,
547                        msgbuf.tag.sid);
548                 err = vio_validate_sid(vio, &msgbuf.tag);
549                 if (err < 0)
550                         break;
551 
552                 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
553                         if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
554                                 err = vnet_rx(port, &msgbuf);
555                         } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
556                                 err = vnet_ack(port, &msgbuf);
557                                 if (err > 0)
558                                         tx_wakeup |= err;
559                         } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
560                                 err = vnet_nack(port, &msgbuf);
561                         }
562                 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
563                         if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
564                                 err = handle_mcast(port, &msgbuf);
565                         else
566                                 err = vio_control_pkt_engine(vio, &msgbuf);
567                         if (err)
568                                 break;
569                 } else {
570                         err = vnet_handle_unknown(port, &msgbuf);
571                 }
572                 if (err == -ECONNRESET)
573                         break;
574         }
575         spin_unlock(&vio->lock);
576         if (unlikely(tx_wakeup && err != -ECONNRESET))
577                 maybe_tx_wakeup(port->vp);
578         local_irq_restore(flags);
579 }
580 
581 static int __vnet_tx_trigger(struct vnet_port *port)
582 {
583         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
584         struct vio_dring_data hdr = {
585                 .tag = {
586                         .type           = VIO_TYPE_DATA,
587                         .stype          = VIO_SUBTYPE_INFO,
588                         .stype_env      = VIO_DRING_DATA,
589                         .sid            = vio_send_sid(&port->vio),
590                 },
591                 .dring_ident            = dr->ident,
592                 .start_idx              = dr->prod,
593                 .end_idx                = (u32) -1,
594         };
595         int err, delay;
596 
597         hdr.seq = dr->snd_nxt;
598         delay = 1;
599         do {
600                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
601                 if (err > 0) {
602                         dr->snd_nxt++;
603                         break;
604                 }
605                 udelay(delay);
606                 if ((delay <<= 1) > 128)
607                         delay = 128;
608         } while (err == -EAGAIN);
609 
610         return err;
611 }
612 
613 static inline bool port_is_up(struct vnet_port *vnet)
614 {
615         struct vio_driver_state *vio = &vnet->vio;
616 
617         return !!(vio->hs_state & VIO_HS_COMPLETE);
618 }
619 
620 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
621 {
622         unsigned int hash = vnet_hashfn(skb->data);
623         struct hlist_head *hp = &vp->port_hash[hash];
624         struct vnet_port *port;
625 
626         hlist_for_each_entry(port, hp, hash) {
627                 if (!port_is_up(port))
628                         continue;
629                 if (ether_addr_equal(port->raddr, skb->data))
630                         return port;
631         }
632         list_for_each_entry(port, &vp->port_list, list) {
633                 if (!port->switch_port)
634                         continue;
635                 if (!port_is_up(port))
636                         continue;
637                 return port;
638         }
639         return NULL;
640 }
641 
642 struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
643 {
644         struct vnet_port *ret;
645         unsigned long flags;
646 
647         spin_lock_irqsave(&vp->lock, flags);
648         ret = __tx_port_find(vp, skb);
649         spin_unlock_irqrestore(&vp->lock, flags);
650 
651         return ret;
652 }
653 
654 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
655 {
656         struct vnet *vp = netdev_priv(dev);
657         struct vnet_port *port = tx_port_find(vp, skb);
658         struct vio_dring_state *dr;
659         struct vio_net_desc *d;
660         unsigned long flags;
661         unsigned int len;
662         void *tx_buf;
663         int i, err;
664 
665         if (unlikely(!port))
666                 goto out_dropped;
667 
668         spin_lock_irqsave(&port->vio.lock, flags);
669 
670         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
671         if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
672                 if (!netif_queue_stopped(dev)) {
673                         netif_stop_queue(dev);
674 
675                         /* This is a hard error, log it. */
676                         netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
677                         dev->stats.tx_errors++;
678                 }
679                 spin_unlock_irqrestore(&port->vio.lock, flags);
680                 return NETDEV_TX_BUSY;
681         }
682 
683         d = vio_dring_cur(dr);
684 
685         tx_buf = port->tx_bufs[dr->prod].buf;
686         skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
687 
688         len = skb->len;
689         if (len < ETH_ZLEN) {
690                 len = ETH_ZLEN;
691                 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
692         }
693 
694         d->hdr.ack = VIO_ACK_ENABLE;
695         d->size = len;
696         d->ncookies = port->tx_bufs[dr->prod].ncookies;
697         for (i = 0; i < d->ncookies; i++)
698                 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
699 
700         /* This has to be a non-SMP write barrier because we are writing
701          * to memory which is shared with the peer LDOM.
702          */
703         wmb();
704 
705         d->hdr.state = VIO_DESC_READY;
706 
707         err = __vnet_tx_trigger(port);
708         if (unlikely(err < 0)) {
709                 netdev_info(dev, "TX trigger error %d\n", err);
710                 d->hdr.state = VIO_DESC_FREE;
711                 dev->stats.tx_carrier_errors++;
712                 goto out_dropped_unlock;
713         }
714 
715         dev->stats.tx_packets++;
716         dev->stats.tx_bytes += skb->len;
717 
718         dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
719         if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
720                 netif_stop_queue(dev);
721                 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
722                         netif_wake_queue(dev);
723         }
724 
725         spin_unlock_irqrestore(&port->vio.lock, flags);
726 
727         dev_kfree_skb(skb);
728 
729         return NETDEV_TX_OK;
730 
731 out_dropped_unlock:
732         spin_unlock_irqrestore(&port->vio.lock, flags);
733 
734 out_dropped:
735         dev_kfree_skb(skb);
736         dev->stats.tx_dropped++;
737         return NETDEV_TX_OK;
738 }
739 
740 static void vnet_tx_timeout(struct net_device *dev)
741 {
742         /* XXX Implement me XXX */
743 }
744 
745 static int vnet_open(struct net_device *dev)
746 {
747         netif_carrier_on(dev);
748         netif_start_queue(dev);
749 
750         return 0;
751 }
752 
753 static int vnet_close(struct net_device *dev)
754 {
755         netif_stop_queue(dev);
756         netif_carrier_off(dev);
757 
758         return 0;
759 }
760 
761 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
762 {
763         struct vnet_mcast_entry *m;
764 
765         for (m = vp->mcast_list; m; m = m->next) {
766                 if (ether_addr_equal(m->addr, addr))
767                         return m;
768         }
769         return NULL;
770 }
771 
772 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
773 {
774         struct netdev_hw_addr *ha;
775 
776         netdev_for_each_mc_addr(ha, dev) {
777                 struct vnet_mcast_entry *m;
778 
779                 m = __vnet_mc_find(vp, ha->addr);
780                 if (m) {
781                         m->hit = 1;
782                         continue;
783                 }
784 
785                 if (!m) {
786                         m = kzalloc(sizeof(*m), GFP_ATOMIC);
787                         if (!m)
788                                 continue;
789                         memcpy(m->addr, ha->addr, ETH_ALEN);
790                         m->hit = 1;
791 
792                         m->next = vp->mcast_list;
793                         vp->mcast_list = m;
794                 }
795         }
796 }
797 
798 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
799 {
800         struct vio_net_mcast_info info;
801         struct vnet_mcast_entry *m, **pp;
802         int n_addrs;
803 
804         memset(&info, 0, sizeof(info));
805 
806         info.tag.type = VIO_TYPE_CTRL;
807         info.tag.stype = VIO_SUBTYPE_INFO;
808         info.tag.stype_env = VNET_MCAST_INFO;
809         info.tag.sid = vio_send_sid(&port->vio);
810         info.set = 1;
811 
812         n_addrs = 0;
813         for (m = vp->mcast_list; m; m = m->next) {
814                 if (m->sent)
815                         continue;
816                 m->sent = 1;
817                 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
818                        m->addr, ETH_ALEN);
819                 if (++n_addrs == VNET_NUM_MCAST) {
820                         info.count = n_addrs;
821 
822                         (void) vio_ldc_send(&port->vio, &info,
823                                             sizeof(info));
824                         n_addrs = 0;
825                 }
826         }
827         if (n_addrs) {
828                 info.count = n_addrs;
829                 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
830         }
831 
832         info.set = 0;
833 
834         n_addrs = 0;
835         pp = &vp->mcast_list;
836         while ((m = *pp) != NULL) {
837                 if (m->hit) {
838                         m->hit = 0;
839                         pp = &m->next;
840                         continue;
841                 }
842 
843                 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
844                        m->addr, ETH_ALEN);
845                 if (++n_addrs == VNET_NUM_MCAST) {
846                         info.count = n_addrs;
847                         (void) vio_ldc_send(&port->vio, &info,
848                                             sizeof(info));
849                         n_addrs = 0;
850                 }
851 
852                 *pp = m->next;
853                 kfree(m);
854         }
855         if (n_addrs) {
856                 info.count = n_addrs;
857                 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
858         }
859 }
860 
861 static void vnet_set_rx_mode(struct net_device *dev)
862 {
863         struct vnet *vp = netdev_priv(dev);
864         struct vnet_port *port;
865         unsigned long flags;
866 
867         spin_lock_irqsave(&vp->lock, flags);
868         if (!list_empty(&vp->port_list)) {
869                 port = list_entry(vp->port_list.next, struct vnet_port, list);
870 
871                 if (port->switch_port) {
872                         __update_mc_list(vp, dev);
873                         __send_mc_list(vp, port);
874                 }
875         }
876         spin_unlock_irqrestore(&vp->lock, flags);
877 }
878 
879 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
880 {
881         if (new_mtu != ETH_DATA_LEN)
882                 return -EINVAL;
883 
884         dev->mtu = new_mtu;
885         return 0;
886 }
887 
888 static int vnet_set_mac_addr(struct net_device *dev, void *p)
889 {
890         return -EINVAL;
891 }
892 
893 static void vnet_get_drvinfo(struct net_device *dev,
894                              struct ethtool_drvinfo *info)
895 {
896         strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
897         strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
898 }
899 
900 static u32 vnet_get_msglevel(struct net_device *dev)
901 {
902         struct vnet *vp = netdev_priv(dev);
903         return vp->msg_enable;
904 }
905 
906 static void vnet_set_msglevel(struct net_device *dev, u32 value)
907 {
908         struct vnet *vp = netdev_priv(dev);
909         vp->msg_enable = value;
910 }
911 
912 static const struct ethtool_ops vnet_ethtool_ops = {
913         .get_drvinfo            = vnet_get_drvinfo,
914         .get_msglevel           = vnet_get_msglevel,
915         .set_msglevel           = vnet_set_msglevel,
916         .get_link               = ethtool_op_get_link,
917 };
918 
919 static void vnet_port_free_tx_bufs(struct vnet_port *port)
920 {
921         struct vio_dring_state *dr;
922         int i;
923 
924         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
925         if (dr->base) {
926                 ldc_free_exp_dring(port->vio.lp, dr->base,
927                                    (dr->entry_size * dr->num_entries),
928                                    dr->cookies, dr->ncookies);
929                 dr->base = NULL;
930                 dr->entry_size = 0;
931                 dr->num_entries = 0;
932                 dr->pending = 0;
933                 dr->ncookies = 0;
934         }
935 
936         for (i = 0; i < VNET_TX_RING_SIZE; i++) {
937                 void *buf = port->tx_bufs[i].buf;
938 
939                 if (!buf)
940                         continue;
941 
942                 ldc_unmap(port->vio.lp,
943                           port->tx_bufs[i].cookies,
944                           port->tx_bufs[i].ncookies);
945 
946                 kfree(buf);
947                 port->tx_bufs[i].buf = NULL;
948         }
949 }
950 
951 static int vnet_port_alloc_tx_bufs(struct vnet_port *port)
952 {
953         struct vio_dring_state *dr;
954         unsigned long len;
955         int i, err, ncookies;
956         void *dring;
957 
958         for (i = 0; i < VNET_TX_RING_SIZE; i++) {
959                 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
960                 int map_len = (ETH_FRAME_LEN + 7) & ~7;
961 
962                 err = -ENOMEM;
963                 if (!buf)
964                         goto err_out;
965 
966                 err = -EFAULT;
967                 if ((unsigned long)buf & (8UL - 1)) {
968                         pr_err("TX buffer misaligned\n");
969                         kfree(buf);
970                         goto err_out;
971                 }
972 
973                 err = ldc_map_single(port->vio.lp, buf, map_len,
974                                      port->tx_bufs[i].cookies, 2,
975                                      (LDC_MAP_SHADOW |
976                                       LDC_MAP_DIRECT |
977                                       LDC_MAP_RW));
978                 if (err < 0) {
979                         kfree(buf);
980                         goto err_out;
981                 }
982                 port->tx_bufs[i].buf = buf;
983                 port->tx_bufs[i].ncookies = err;
984         }
985 
986         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
987 
988         len = (VNET_TX_RING_SIZE *
989                (sizeof(struct vio_net_desc) +
990                 (sizeof(struct ldc_trans_cookie) * 2)));
991 
992         ncookies = VIO_MAX_RING_COOKIES;
993         dring = ldc_alloc_exp_dring(port->vio.lp, len,
994                                     dr->cookies, &ncookies,
995                                     (LDC_MAP_SHADOW |
996                                      LDC_MAP_DIRECT |
997                                      LDC_MAP_RW));
998         if (IS_ERR(dring)) {
999                 err = PTR_ERR(dring);
1000                 goto err_out;
1001         }
1002 
1003         dr->base = dring;
1004         dr->entry_size = (sizeof(struct vio_net_desc) +
1005                           (sizeof(struct ldc_trans_cookie) * 2));
1006         dr->num_entries = VNET_TX_RING_SIZE;
1007         dr->prod = dr->cons = 0;
1008         dr->pending = VNET_TX_RING_SIZE;
1009         dr->ncookies = ncookies;
1010 
1011         return 0;
1012 
1013 err_out:
1014         vnet_port_free_tx_bufs(port);
1015 
1016         return err;
1017 }
1018 
1019 static LIST_HEAD(vnet_list);
1020 static DEFINE_MUTEX(vnet_list_mutex);
1021 
1022 static const struct net_device_ops vnet_ops = {
1023         .ndo_open               = vnet_open,
1024         .ndo_stop               = vnet_close,
1025         .ndo_set_rx_mode        = vnet_set_rx_mode,
1026         .ndo_set_mac_address    = vnet_set_mac_addr,
1027         .ndo_validate_addr      = eth_validate_addr,
1028         .ndo_tx_timeout         = vnet_tx_timeout,
1029         .ndo_change_mtu         = vnet_change_mtu,
1030         .ndo_start_xmit         = vnet_start_xmit,
1031 };
1032 
1033 static struct vnet *vnet_new(const u64 *local_mac)
1034 {
1035         struct net_device *dev;
1036         struct vnet *vp;
1037         int err, i;
1038 
1039         dev = alloc_etherdev(sizeof(*vp));
1040         if (!dev)
1041                 return ERR_PTR(-ENOMEM);
1042 
1043         for (i = 0; i < ETH_ALEN; i++)
1044                 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1045 
1046         vp = netdev_priv(dev);
1047 
1048         spin_lock_init(&vp->lock);
1049         vp->dev = dev;
1050 
1051         INIT_LIST_HEAD(&vp->port_list);
1052         for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1053                 INIT_HLIST_HEAD(&vp->port_hash[i]);
1054         INIT_LIST_HEAD(&vp->list);
1055         vp->local_mac = *local_mac;
1056 
1057         dev->netdev_ops = &vnet_ops;
1058         dev->ethtool_ops = &vnet_ethtool_ops;
1059         dev->watchdog_timeo = VNET_TX_TIMEOUT;
1060 
1061         err = register_netdev(dev);
1062         if (err) {
1063                 pr_err("Cannot register net device, aborting\n");
1064                 goto err_out_free_dev;
1065         }
1066 
1067         netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
1068 
1069         list_add(&vp->list, &vnet_list);
1070 
1071         return vp;
1072 
1073 err_out_free_dev:
1074         free_netdev(dev);
1075 
1076         return ERR_PTR(err);
1077 }
1078 
1079 static struct vnet *vnet_find_or_create(const u64 *local_mac)
1080 {
1081         struct vnet *iter, *vp;
1082 
1083         mutex_lock(&vnet_list_mutex);
1084         vp = NULL;
1085         list_for_each_entry(iter, &vnet_list, list) {
1086                 if (iter->local_mac == *local_mac) {
1087                         vp = iter;
1088                         break;
1089                 }
1090         }
1091         if (!vp)
1092                 vp = vnet_new(local_mac);
1093         mutex_unlock(&vnet_list_mutex);
1094 
1095         return vp;
1096 }
1097 
1098 static void vnet_cleanup(void)
1099 {
1100         struct vnet *vp;
1101         struct net_device *dev;
1102 
1103         mutex_lock(&vnet_list_mutex);
1104         while (!list_empty(&vnet_list)) {
1105                 vp = list_first_entry(&vnet_list, struct vnet, list);
1106                 list_del(&vp->list);
1107                 dev = vp->dev;
1108                 /* vio_unregister_driver() should have cleaned up port_list */
1109                 BUG_ON(!list_empty(&vp->port_list));
1110                 unregister_netdev(dev);
1111                 free_netdev(dev);
1112         }
1113         mutex_unlock(&vnet_list_mutex);
1114 }
1115 
1116 static const char *local_mac_prop = "local-mac-address";
1117 
1118 static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
1119                                                 u64 port_node)
1120 {
1121         const u64 *local_mac = NULL;
1122         u64 a;
1123 
1124         mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1125                 u64 target = mdesc_arc_target(hp, a);
1126                 const char *name;
1127 
1128                 name = mdesc_get_property(hp, target, "name", NULL);
1129                 if (!name || strcmp(name, "network"))
1130                         continue;
1131 
1132                 local_mac = mdesc_get_property(hp, target,
1133                                                local_mac_prop, NULL);
1134                 if (local_mac)
1135                         break;
1136         }
1137         if (!local_mac)
1138                 return ERR_PTR(-ENODEV);
1139 
1140         return vnet_find_or_create(local_mac);
1141 }
1142 
1143 static struct ldc_channel_config vnet_ldc_cfg = {
1144         .event          = vnet_event,
1145         .mtu            = 64,
1146         .mode           = LDC_MODE_UNRELIABLE,
1147 };
1148 
1149 static struct vio_driver_ops vnet_vio_ops = {
1150         .send_attr              = vnet_send_attr,
1151         .handle_attr            = vnet_handle_attr,
1152         .handshake_complete     = vnet_handshake_complete,
1153 };
1154 
1155 static void print_version(void)
1156 {
1157         printk_once(KERN_INFO "%s", version);
1158 }
1159 
1160 const char *remote_macaddr_prop = "remote-mac-address";
1161 
1162 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1163 {
1164         struct mdesc_handle *hp;
1165         struct vnet_port *port;
1166         unsigned long flags;
1167         struct vnet *vp;
1168         const u64 *rmac;
1169         int len, i, err, switch_port;
1170 
1171         print_version();
1172 
1173         hp = mdesc_grab();
1174 
1175         vp = vnet_find_parent(hp, vdev->mp);
1176         if (IS_ERR(vp)) {
1177                 pr_err("Cannot find port parent vnet\n");
1178                 err = PTR_ERR(vp);
1179                 goto err_out_put_mdesc;
1180         }
1181 
1182         rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1183         err = -ENODEV;
1184         if (!rmac) {
1185                 pr_err("Port lacks %s property\n", remote_macaddr_prop);
1186                 goto err_out_put_mdesc;
1187         }
1188 
1189         port = kzalloc(sizeof(*port), GFP_KERNEL);
1190         err = -ENOMEM;
1191         if (!port)
1192                 goto err_out_put_mdesc;
1193 
1194         for (i = 0; i < ETH_ALEN; i++)
1195                 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1196 
1197         port->vp = vp;
1198 
1199         err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1200                               vnet_versions, ARRAY_SIZE(vnet_versions),
1201                               &vnet_vio_ops, vp->dev->name);
1202         if (err)
1203                 goto err_out_free_port;
1204 
1205         err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1206         if (err)
1207                 goto err_out_free_port;
1208 
1209         err = vnet_port_alloc_tx_bufs(port);
1210         if (err)
1211                 goto err_out_free_ldc;
1212 
1213         INIT_HLIST_NODE(&port->hash);
1214         INIT_LIST_HEAD(&port->list);
1215 
1216         switch_port = 0;
1217         if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1218                 switch_port = 1;
1219         port->switch_port = switch_port;
1220 
1221         spin_lock_irqsave(&vp->lock, flags);
1222         if (switch_port)
1223                 list_add(&port->list, &vp->port_list);
1224         else
1225                 list_add_tail(&port->list, &vp->port_list);
1226         hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1227         spin_unlock_irqrestore(&vp->lock, flags);
1228 
1229         dev_set_drvdata(&vdev->dev, port);
1230 
1231         pr_info("%s: PORT ( remote-mac %pM%s )\n",
1232                 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
1233 
1234         vio_port_up(&port->vio);
1235 
1236         mdesc_release(hp);
1237 
1238         return 0;
1239 
1240 err_out_free_ldc:
1241         vio_ldc_free(&port->vio);
1242 
1243 err_out_free_port:
1244         kfree(port);
1245 
1246 err_out_put_mdesc:
1247         mdesc_release(hp);
1248         return err;
1249 }
1250 
1251 static int vnet_port_remove(struct vio_dev *vdev)
1252 {
1253         struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1254 
1255         if (port) {
1256                 struct vnet *vp = port->vp;
1257                 unsigned long flags;
1258 
1259                 del_timer_sync(&port->vio.timer);
1260 
1261                 spin_lock_irqsave(&vp->lock, flags);
1262                 list_del(&port->list);
1263                 hlist_del(&port->hash);
1264                 spin_unlock_irqrestore(&vp->lock, flags);
1265 
1266                 vnet_port_free_tx_bufs(port);
1267                 vio_ldc_free(&port->vio);
1268 
1269                 dev_set_drvdata(&vdev->dev, NULL);
1270 
1271                 kfree(port);
1272 
1273         }
1274         return 0;
1275 }
1276 
1277 static const struct vio_device_id vnet_port_match[] = {
1278         {
1279                 .type = "vnet-port",
1280         },
1281         {},
1282 };
1283 MODULE_DEVICE_TABLE(vio, vnet_port_match);
1284 
1285 static struct vio_driver vnet_port_driver = {
1286         .id_table       = vnet_port_match,
1287         .probe          = vnet_port_probe,
1288         .remove         = vnet_port_remove,
1289         .name           = "vnet_port",
1290 };
1291 
1292 static int __init vnet_init(void)
1293 {
1294         return vio_register_driver(&vnet_port_driver);
1295 }
1296 
1297 static void __exit vnet_exit(void)
1298 {
1299         vio_unregister_driver(&vnet_port_driver);
1300         vnet_cleanup();
1301 }
1302 
1303 module_init(vnet_init);
1304 module_exit(vnet_exit);
1305 

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