[SPARC64]: Abstract out mdesc accesses for better MD update handling.
[linux-2.6.git] / drivers / net / sunvnet.c
1 /* sunvnet.c: Sun LDOM Virtual Network Driver.
2  *
3  * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
4  */
5
6 #include <linux/module.h>
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/slab.h>
10 #include <linux/delay.h>
11 #include <linux/init.h>
12 #include <linux/netdevice.h>
13 #include <linux/ethtool.h>
14 #include <linux/etherdevice.h>
15
16 #include <asm/vio.h>
17 #include <asm/ldc.h>
18
19 #include "sunvnet.h"
20
21 #define DRV_MODULE_NAME         "sunvnet"
22 #define PFX DRV_MODULE_NAME     ": "
23 #define DRV_MODULE_VERSION      "1.0"
24 #define DRV_MODULE_RELDATE      "June 25, 2007"
25
26 static char version[] __devinitdata =
27         DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
28 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
29 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
30 MODULE_LICENSE("GPL");
31 MODULE_VERSION(DRV_MODULE_VERSION);
32
33 /* Ordered from largest major to lowest */
34 static struct vio_version vnet_versions[] = {
35         { .major = 1, .minor = 0 },
36 };
37
38 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
39 {
40         return vio_dring_avail(dr, VNET_TX_RING_SIZE);
41 }
42
43 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
44 {
45         struct vio_msg_tag *pkt = arg;
46
47         printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
48                pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
49         printk(KERN_ERR PFX "Resetting connection.\n");
50
51         ldc_disconnect(port->vio.lp);
52
53         return -ECONNRESET;
54 }
55
56 static int vnet_send_attr(struct vio_driver_state *vio)
57 {
58         struct vnet_port *port = to_vnet_port(vio);
59         struct net_device *dev = port->vp->dev;
60         struct vio_net_attr_info pkt;
61         int i;
62
63         memset(&pkt, 0, sizeof(pkt));
64         pkt.tag.type = VIO_TYPE_CTRL;
65         pkt.tag.stype = VIO_SUBTYPE_INFO;
66         pkt.tag.stype_env = VIO_ATTR_INFO;
67         pkt.tag.sid = vio_send_sid(vio);
68         pkt.xfer_mode = VIO_DRING_MODE;
69         pkt.addr_type = VNET_ADDR_ETHERMAC;
70         pkt.ack_freq = 0;
71         for (i = 0; i < 6; i++)
72                 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
73         pkt.mtu = ETH_FRAME_LEN;
74
75         viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
76                "ackfreq[%u] mtu[%llu]\n",
77                pkt.xfer_mode, pkt.addr_type,
78                (unsigned long long) pkt.addr,
79                pkt.ack_freq,
80                (unsigned long long) pkt.mtu);
81
82         return vio_ldc_send(vio, &pkt, sizeof(pkt));
83 }
84
85 static int handle_attr_info(struct vio_driver_state *vio,
86                             struct vio_net_attr_info *pkt)
87 {
88         viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
89                "ackfreq[%u] mtu[%llu]\n",
90                pkt->xfer_mode, pkt->addr_type,
91                (unsigned long long) pkt->addr,
92                pkt->ack_freq,
93                (unsigned long long) pkt->mtu);
94
95         pkt->tag.sid = vio_send_sid(vio);
96
97         if (pkt->xfer_mode != VIO_DRING_MODE ||
98             pkt->addr_type != VNET_ADDR_ETHERMAC ||
99             pkt->mtu != ETH_FRAME_LEN) {
100                 viodbg(HS, "SEND NET ATTR NACK\n");
101
102                 pkt->tag.stype = VIO_SUBTYPE_NACK;
103
104                 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
105
106                 return -ECONNRESET;
107         } else {
108                 viodbg(HS, "SEND NET ATTR ACK\n");
109
110                 pkt->tag.stype = VIO_SUBTYPE_ACK;
111
112                 return vio_ldc_send(vio, pkt, sizeof(*pkt));
113         }
114
115 }
116
117 static int handle_attr_ack(struct vio_driver_state *vio,
118                            struct vio_net_attr_info *pkt)
119 {
120         viodbg(HS, "GOT NET ATTR ACK\n");
121
122         return 0;
123 }
124
125 static int handle_attr_nack(struct vio_driver_state *vio,
126                             struct vio_net_attr_info *pkt)
127 {
128         viodbg(HS, "GOT NET ATTR NACK\n");
129
130         return -ECONNRESET;
131 }
132
133 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
134 {
135         struct vio_net_attr_info *pkt = arg;
136
137         switch (pkt->tag.stype) {
138         case VIO_SUBTYPE_INFO:
139                 return handle_attr_info(vio, pkt);
140
141         case VIO_SUBTYPE_ACK:
142                 return handle_attr_ack(vio, pkt);
143
144         case VIO_SUBTYPE_NACK:
145                 return handle_attr_nack(vio, pkt);
146
147         default:
148                 return -ECONNRESET;
149         }
150 }
151
152 static void vnet_handshake_complete(struct vio_driver_state *vio)
153 {
154         struct vio_dring_state *dr;
155
156         dr = &vio->drings[VIO_DRIVER_RX_RING];
157         dr->snd_nxt = dr->rcv_nxt = 1;
158
159         dr = &vio->drings[VIO_DRIVER_TX_RING];
160         dr->snd_nxt = dr->rcv_nxt = 1;
161 }
162
163 /* The hypervisor interface that implements copying to/from imported
164  * memory from another domain requires that copies are done to 8-byte
165  * aligned buffers, and that the lengths of such copies are also 8-byte
166  * multiples.
167  *
168  * So we align skb->data to an 8-byte multiple and pad-out the data
169  * area so we can round the copy length up to the next multiple of
170  * 8 for the copy.
171  *
172  * The transmitter puts the actual start of the packet 6 bytes into
173  * the buffer it sends over, so that the IP headers after the ethernet
174  * header are aligned properly.  These 6 bytes are not in the descriptor
175  * length, they are simply implied.  This offset is represented using
176  * the VNET_PACKET_SKIP macro.
177  */
178 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
179                                            unsigned int len)
180 {
181         struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
182         unsigned long addr, off;
183
184         if (unlikely(!skb))
185                 return NULL;
186
187         addr = (unsigned long) skb->data;
188         off = ((addr + 7UL) & ~7UL) - addr;
189         if (off)
190                 skb_reserve(skb, off);
191
192         return skb;
193 }
194
195 static int vnet_rx_one(struct vnet_port *port, unsigned int len,
196                        struct ldc_trans_cookie *cookies, int ncookies)
197 {
198         struct net_device *dev = port->vp->dev;
199         unsigned int copy_len;
200         struct sk_buff *skb;
201         int err;
202
203         err = -EMSGSIZE;
204         if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
205                 dev->stats.rx_length_errors++;
206                 goto out_dropped;
207         }
208
209         skb = alloc_and_align_skb(dev, len);
210         err = -ENOMEM;
211         if (unlikely(!skb)) {
212                 dev->stats.rx_missed_errors++;
213                 goto out_dropped;
214         }
215
216         copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
217         skb_put(skb, copy_len);
218         err = ldc_copy(port->vio.lp, LDC_COPY_IN,
219                        skb->data, copy_len, 0,
220                        cookies, ncookies);
221         if (unlikely(err < 0)) {
222                 dev->stats.rx_frame_errors++;
223                 goto out_free_skb;
224         }
225
226         skb_pull(skb, VNET_PACKET_SKIP);
227         skb_trim(skb, len);
228         skb->protocol = eth_type_trans(skb, dev);
229
230         dev->stats.rx_packets++;
231         dev->stats.rx_bytes += len;
232
233         netif_rx(skb);
234
235         return 0;
236
237 out_free_skb:
238         kfree_skb(skb);
239
240 out_dropped:
241         dev->stats.rx_dropped++;
242         return err;
243 }
244
245 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
246                          u32 start, u32 end, u8 vio_dring_state)
247 {
248         struct vio_dring_data hdr = {
249                 .tag = {
250                         .type           = VIO_TYPE_DATA,
251                         .stype          = VIO_SUBTYPE_ACK,
252                         .stype_env      = VIO_DRING_DATA,
253                         .sid            = vio_send_sid(&port->vio),
254                 },
255                 .dring_ident            = dr->ident,
256                 .start_idx              = start,
257                 .end_idx                = end,
258                 .state                  = vio_dring_state,
259         };
260         int err, delay;
261
262         hdr.seq = dr->snd_nxt;
263         delay = 1;
264         do {
265                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
266                 if (err > 0) {
267                         dr->snd_nxt++;
268                         break;
269                 }
270                 udelay(delay);
271                 if ((delay <<= 1) > 128)
272                         delay = 128;
273         } while (err == -EAGAIN);
274
275         return err;
276 }
277
278 static u32 next_idx(u32 idx, struct vio_dring_state *dr)
279 {
280         if (++idx == dr->num_entries)
281                 idx = 0;
282         return idx;
283 }
284
285 static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
286 {
287         if (idx == 0)
288                 idx = dr->num_entries - 1;
289         else
290                 idx--;
291
292         return idx;
293 }
294
295 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
296                                         struct vio_dring_state *dr,
297                                         u32 index)
298 {
299         struct vio_net_desc *desc = port->vio.desc_buf;
300         int err;
301
302         err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
303                                   (index * dr->entry_size),
304                                   dr->cookies, dr->ncookies);
305         if (err < 0)
306                 return ERR_PTR(err);
307
308         return desc;
309 }
310
311 static int put_rx_desc(struct vnet_port *port,
312                        struct vio_dring_state *dr,
313                        struct vio_net_desc *desc,
314                        u32 index)
315 {
316         int err;
317
318         err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
319                                   (index * dr->entry_size),
320                                   dr->cookies, dr->ncookies);
321         if (err < 0)
322                 return err;
323
324         return 0;
325 }
326
327 static int vnet_walk_rx_one(struct vnet_port *port,
328                             struct vio_dring_state *dr,
329                             u32 index, int *needs_ack)
330 {
331         struct vio_net_desc *desc = get_rx_desc(port, dr, index);
332         struct vio_driver_state *vio = &port->vio;
333         int err;
334
335         if (IS_ERR(desc))
336                 return PTR_ERR(desc);
337
338         viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%lx:%lx]\n",
339                desc->hdr.state, desc->hdr.ack,
340                desc->size, desc->ncookies,
341                desc->cookies[0].cookie_addr,
342                desc->cookies[0].cookie_size);
343
344         if (desc->hdr.state != VIO_DESC_READY)
345                 return 1;
346         err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
347         if (err == -ECONNRESET)
348                 return err;
349         desc->hdr.state = VIO_DESC_DONE;
350         err = put_rx_desc(port, dr, desc, index);
351         if (err < 0)
352                 return err;
353         *needs_ack = desc->hdr.ack;
354         return 0;
355 }
356
357 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
358                         u32 start, u32 end)
359 {
360         struct vio_driver_state *vio = &port->vio;
361         int ack_start = -1, ack_end = -1;
362
363         end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
364
365         viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
366
367         while (start != end) {
368                 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
369                 if (err == -ECONNRESET)
370                         return err;
371                 if (err != 0)
372                         break;
373                 if (ack_start == -1)
374                         ack_start = start;
375                 ack_end = start;
376                 start = next_idx(start, dr);
377                 if (ack && start != end) {
378                         err = vnet_send_ack(port, dr, ack_start, ack_end,
379                                             VIO_DRING_ACTIVE);
380                         if (err == -ECONNRESET)
381                                 return err;
382                         ack_start = -1;
383                 }
384         }
385         if (unlikely(ack_start == -1))
386                 ack_start = ack_end = prev_idx(start, dr);
387         return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
388 }
389
390 static int vnet_rx(struct vnet_port *port, void *msgbuf)
391 {
392         struct vio_dring_data *pkt = msgbuf;
393         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
394         struct vio_driver_state *vio = &port->vio;
395
396         viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016lx] rcv_nxt[%016lx]\n",
397                pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
398
399         if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
400                 return 0;
401         if (unlikely(pkt->seq != dr->rcv_nxt)) {
402                 printk(KERN_ERR PFX "RX out of sequence seq[0x%lx] "
403                        "rcv_nxt[0x%lx]\n", pkt->seq, dr->rcv_nxt);
404                 return 0;
405         }
406
407         dr->rcv_nxt++;
408
409         /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
410
411         return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
412 }
413
414 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
415 {
416         u32 idx = dr->cons;
417         int found = 0;
418
419         while (idx != dr->prod) {
420                 if (idx == end) {
421                         found = 1;
422                         break;
423                 }
424                 idx = next_idx(idx, dr);
425         }
426         return found;
427 }
428
429 static int vnet_ack(struct vnet_port *port, void *msgbuf)
430 {
431         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
432         struct vio_dring_data *pkt = msgbuf;
433         struct net_device *dev;
434         struct vnet *vp;
435         u32 end;
436
437         if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
438                 return 0;
439
440         end = pkt->end_idx;
441         if (unlikely(!idx_is_pending(dr, end)))
442                 return 0;
443
444         dr->cons = next_idx(end, dr);
445
446         vp = port->vp;
447         dev = vp->dev;
448         if (unlikely(netif_queue_stopped(dev) &&
449                      vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
450                 return 1;
451
452         return 0;
453 }
454
455 static int vnet_nack(struct vnet_port *port, void *msgbuf)
456 {
457         /* XXX just reset or similar XXX */
458         return 0;
459 }
460
461 static void maybe_tx_wakeup(struct vnet *vp)
462 {
463         struct net_device *dev = vp->dev;
464
465         netif_tx_lock(dev);
466         if (likely(netif_queue_stopped(dev))) {
467                 struct vnet_port *port;
468                 int wake = 1;
469
470                 list_for_each_entry(port, &vp->port_list, list) {
471                         struct vio_dring_state *dr;
472
473                         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
474                         if (vnet_tx_dring_avail(dr) <
475                             VNET_TX_WAKEUP_THRESH(dr)) {
476                                 wake = 0;
477                                 break;
478                         }
479                 }
480                 if (wake)
481                         netif_wake_queue(dev);
482         }
483         netif_tx_unlock(dev);
484 }
485
486 static void vnet_event(void *arg, int event)
487 {
488         struct vnet_port *port = arg;
489         struct vio_driver_state *vio = &port->vio;
490         unsigned long flags;
491         int tx_wakeup, err;
492
493         spin_lock_irqsave(&vio->lock, flags);
494
495         if (unlikely(event == LDC_EVENT_RESET ||
496                      event == LDC_EVENT_UP)) {
497                 vio_link_state_change(vio, event);
498                 spin_unlock_irqrestore(&vio->lock, flags);
499
500                 return;
501         }
502
503         if (unlikely(event != LDC_EVENT_DATA_READY)) {
504                 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
505                 spin_unlock_irqrestore(&vio->lock, flags);
506                 return;
507         }
508
509         tx_wakeup = err = 0;
510         while (1) {
511                 union {
512                         struct vio_msg_tag tag;
513                         u64 raw[8];
514                 } msgbuf;
515
516                 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
517                 if (unlikely(err < 0)) {
518                         if (err == -ECONNRESET)
519                                 vio_conn_reset(vio);
520                         break;
521                 }
522                 if (err == 0)
523                         break;
524                 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
525                        msgbuf.tag.type,
526                        msgbuf.tag.stype,
527                        msgbuf.tag.stype_env,
528                        msgbuf.tag.sid);
529                 err = vio_validate_sid(vio, &msgbuf.tag);
530                 if (err < 0)
531                         break;
532
533                 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
534                         if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
535                                 err = vnet_rx(port, &msgbuf);
536                         } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
537                                 err = vnet_ack(port, &msgbuf);
538                                 if (err > 0)
539                                         tx_wakeup |= err;
540                         } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
541                                 err = vnet_nack(port, &msgbuf);
542                         }
543                 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
544                         err = vio_control_pkt_engine(vio, &msgbuf);
545                         if (err)
546                                 break;
547                 } else {
548                         err = vnet_handle_unknown(port, &msgbuf);
549                 }
550                 if (err == -ECONNRESET)
551                         break;
552         }
553         spin_unlock(&vio->lock);
554         if (unlikely(tx_wakeup && err != -ECONNRESET))
555                 maybe_tx_wakeup(port->vp);
556         local_irq_restore(flags);
557 }
558
559 static int __vnet_tx_trigger(struct vnet_port *port)
560 {
561         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
562         struct vio_dring_data hdr = {
563                 .tag = {
564                         .type           = VIO_TYPE_DATA,
565                         .stype          = VIO_SUBTYPE_INFO,
566                         .stype_env      = VIO_DRING_DATA,
567                         .sid            = vio_send_sid(&port->vio),
568                 },
569                 .dring_ident            = dr->ident,
570                 .start_idx              = dr->prod,
571                 .end_idx                = (u32) -1,
572         };
573         int err, delay;
574
575         hdr.seq = dr->snd_nxt;
576         delay = 1;
577         do {
578                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
579                 if (err > 0) {
580                         dr->snd_nxt++;
581                         break;
582                 }
583                 udelay(delay);
584                 if ((delay <<= 1) > 128)
585                         delay = 128;
586         } while (err == -EAGAIN);
587
588         return err;
589 }
590
591 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
592 {
593         unsigned int hash = vnet_hashfn(skb->data);
594         struct hlist_head *hp = &vp->port_hash[hash];
595         struct hlist_node *n;
596         struct vnet_port *port;
597
598         hlist_for_each_entry(port, n, hp, hash) {
599                 if (!compare_ether_addr(port->raddr, skb->data))
600                         return port;
601         }
602         port = NULL;
603         if (!list_empty(&vp->port_list))
604                 port = list_entry(vp->port_list.next, struct vnet_port, list);
605
606         return port;
607 }
608
609 struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
610 {
611         struct vnet_port *ret;
612         unsigned long flags;
613
614         spin_lock_irqsave(&vp->lock, flags);
615         ret = __tx_port_find(vp, skb);
616         spin_unlock_irqrestore(&vp->lock, flags);
617
618         return ret;
619 }
620
621 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
622 {
623         struct vnet *vp = netdev_priv(dev);
624         struct vnet_port *port = tx_port_find(vp, skb);
625         struct vio_dring_state *dr;
626         struct vio_net_desc *d;
627         unsigned long flags;
628         unsigned int len;
629         void *tx_buf;
630         int i, err;
631
632         if (unlikely(!port))
633                 goto out_dropped;
634
635         spin_lock_irqsave(&port->vio.lock, flags);
636
637         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
638         if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
639                 if (!netif_queue_stopped(dev)) {
640                         netif_stop_queue(dev);
641
642                         /* This is a hard error, log it. */
643                         printk(KERN_ERR PFX "%s: BUG! Tx Ring full when "
644                                "queue awake!\n", dev->name);
645                         dev->stats.tx_errors++;
646                 }
647                 spin_unlock_irqrestore(&port->vio.lock, flags);
648                 return NETDEV_TX_BUSY;
649         }
650
651         d = vio_dring_cur(dr);
652
653         tx_buf = port->tx_bufs[dr->prod].buf;
654         skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
655
656         len = skb->len;
657         if (len < ETH_ZLEN) {
658                 len = ETH_ZLEN;
659                 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
660         }
661
662         d->hdr.ack = VIO_ACK_ENABLE;
663         d->size = len;
664         d->ncookies = port->tx_bufs[dr->prod].ncookies;
665         for (i = 0; i < d->ncookies; i++)
666                 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
667
668         /* This has to be a non-SMP write barrier because we are writing
669          * to memory which is shared with the peer LDOM.
670          */
671         wmb();
672
673         d->hdr.state = VIO_DESC_READY;
674
675         err = __vnet_tx_trigger(port);
676         if (unlikely(err < 0)) {
677                 printk(KERN_INFO PFX "%s: TX trigger error %d\n",
678                        dev->name, err);
679                 d->hdr.state = VIO_DESC_FREE;
680                 dev->stats.tx_carrier_errors++;
681                 goto out_dropped_unlock;
682         }
683
684         dev->stats.tx_packets++;
685         dev->stats.tx_bytes += skb->len;
686
687         dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
688         if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
689                 netif_stop_queue(dev);
690                 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
691                         netif_wake_queue(dev);
692         }
693
694         spin_unlock_irqrestore(&port->vio.lock, flags);
695
696         dev_kfree_skb(skb);
697
698         dev->trans_start = jiffies;
699         return NETDEV_TX_OK;
700
701 out_dropped_unlock:
702         spin_unlock_irqrestore(&port->vio.lock, flags);
703
704 out_dropped:
705         dev_kfree_skb(skb);
706         dev->stats.tx_dropped++;
707         return NETDEV_TX_OK;
708 }
709
710 static void vnet_tx_timeout(struct net_device *dev)
711 {
712         /* XXX Implement me XXX */
713 }
714
715 static int vnet_open(struct net_device *dev)
716 {
717         netif_carrier_on(dev);
718         netif_start_queue(dev);
719
720         return 0;
721 }
722
723 static int vnet_close(struct net_device *dev)
724 {
725         netif_stop_queue(dev);
726         netif_carrier_off(dev);
727
728         return 0;
729 }
730
731 static void vnet_set_rx_mode(struct net_device *dev)
732 {
733         /* XXX Implement multicast support XXX */
734 }
735
736 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
737 {
738         if (new_mtu != ETH_DATA_LEN)
739                 return -EINVAL;
740
741         dev->mtu = new_mtu;
742         return 0;
743 }
744
745 static int vnet_set_mac_addr(struct net_device *dev, void *p)
746 {
747         return -EINVAL;
748 }
749
750 static void vnet_get_drvinfo(struct net_device *dev,
751                              struct ethtool_drvinfo *info)
752 {
753         strcpy(info->driver, DRV_MODULE_NAME);
754         strcpy(info->version, DRV_MODULE_VERSION);
755 }
756
757 static u32 vnet_get_msglevel(struct net_device *dev)
758 {
759         struct vnet *vp = netdev_priv(dev);
760         return vp->msg_enable;
761 }
762
763 static void vnet_set_msglevel(struct net_device *dev, u32 value)
764 {
765         struct vnet *vp = netdev_priv(dev);
766         vp->msg_enable = value;
767 }
768
769 static const struct ethtool_ops vnet_ethtool_ops = {
770         .get_drvinfo            = vnet_get_drvinfo,
771         .get_msglevel           = vnet_get_msglevel,
772         .set_msglevel           = vnet_set_msglevel,
773         .get_link               = ethtool_op_get_link,
774         .get_perm_addr          = ethtool_op_get_perm_addr,
775 };
776
777 static void vnet_port_free_tx_bufs(struct vnet_port *port)
778 {
779         struct vio_dring_state *dr;
780         int i;
781
782         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
783         if (dr->base) {
784                 ldc_free_exp_dring(port->vio.lp, dr->base,
785                                    (dr->entry_size * dr->num_entries),
786                                    dr->cookies, dr->ncookies);
787                 dr->base = NULL;
788                 dr->entry_size = 0;
789                 dr->num_entries = 0;
790                 dr->pending = 0;
791                 dr->ncookies = 0;
792         }
793
794         for (i = 0; i < VNET_TX_RING_SIZE; i++) {
795                 void *buf = port->tx_bufs[i].buf;
796
797                 if (!buf)
798                         continue;
799
800                 ldc_unmap(port->vio.lp,
801                           port->tx_bufs[i].cookies,
802                           port->tx_bufs[i].ncookies);
803
804                 kfree(buf);
805                 port->tx_bufs[i].buf = NULL;
806         }
807 }
808
809 static int __devinit vnet_port_alloc_tx_bufs(struct vnet_port *port)
810 {
811         struct vio_dring_state *dr;
812         unsigned long len;
813         int i, err, ncookies;
814         void *dring;
815
816         for (i = 0; i < VNET_TX_RING_SIZE; i++) {
817                 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
818                 int map_len = (ETH_FRAME_LEN + 7) & ~7;
819
820                 err = -ENOMEM;
821                 if (!buf) {
822                         printk(KERN_ERR "TX buffer allocation failure\n");
823                         goto err_out;
824                 }
825                 err = -EFAULT;
826                 if ((unsigned long)buf & (8UL - 1)) {
827                         printk(KERN_ERR "TX buffer misaligned\n");
828                         kfree(buf);
829                         goto err_out;
830                 }
831
832                 err = ldc_map_single(port->vio.lp, buf, map_len,
833                                      port->tx_bufs[i].cookies, 2,
834                                      (LDC_MAP_SHADOW |
835                                       LDC_MAP_DIRECT |
836                                       LDC_MAP_RW));
837                 if (err < 0) {
838                         kfree(buf);
839                         goto err_out;
840                 }
841                 port->tx_bufs[i].buf = buf;
842                 port->tx_bufs[i].ncookies = err;
843         }
844
845         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
846
847         len = (VNET_TX_RING_SIZE *
848                (sizeof(struct vio_net_desc) +
849                 (sizeof(struct ldc_trans_cookie) * 2)));
850
851         ncookies = VIO_MAX_RING_COOKIES;
852         dring = ldc_alloc_exp_dring(port->vio.lp, len,
853                                     dr->cookies, &ncookies,
854                                     (LDC_MAP_SHADOW |
855                                      LDC_MAP_DIRECT |
856                                      LDC_MAP_RW));
857         if (IS_ERR(dring)) {
858                 err = PTR_ERR(dring);
859                 goto err_out;
860         }
861
862         dr->base = dring;
863         dr->entry_size = (sizeof(struct vio_net_desc) +
864                           (sizeof(struct ldc_trans_cookie) * 2));
865         dr->num_entries = VNET_TX_RING_SIZE;
866         dr->prod = dr->cons = 0;
867         dr->pending = VNET_TX_RING_SIZE;
868         dr->ncookies = ncookies;
869
870         return 0;
871
872 err_out:
873         vnet_port_free_tx_bufs(port);
874
875         return err;
876 }
877
878 static struct ldc_channel_config vnet_ldc_cfg = {
879         .event          = vnet_event,
880         .mtu            = 64,
881         .mode           = LDC_MODE_UNRELIABLE,
882 };
883
884 static struct vio_driver_ops vnet_vio_ops = {
885         .send_attr              = vnet_send_attr,
886         .handle_attr            = vnet_handle_attr,
887         .handshake_complete     = vnet_handshake_complete,
888 };
889
890 const char *remote_macaddr_prop = "remote-mac-address";
891
892 static int __devinit vnet_port_probe(struct vio_dev *vdev,
893                                      const struct vio_device_id *id)
894 {
895         struct mdesc_handle *hp;
896         struct vnet_port *port;
897         unsigned long flags;
898         struct vnet *vp;
899         const u64 *rmac;
900         int len, i, err, switch_port;
901
902         vp = dev_get_drvdata(vdev->dev.parent);
903         if (!vp) {
904                 printk(KERN_ERR PFX "Cannot find port parent vnet.\n");
905                 return -ENODEV;
906         }
907
908         hp = mdesc_grab();
909
910         rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
911         err = -ENODEV;
912         if (!rmac) {
913                 printk(KERN_ERR PFX "Port lacks %s property.\n",
914                        remote_macaddr_prop);
915                 goto err_out_put_mdesc;
916         }
917
918         port = kzalloc(sizeof(*port), GFP_KERNEL);
919         err = -ENOMEM;
920         if (!port) {
921                 printk(KERN_ERR PFX "Cannot allocate vnet_port.\n");
922                 goto err_out_put_mdesc;
923         }
924
925         for (i = 0; i < ETH_ALEN; i++)
926                 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
927
928         port->vp = vp;
929
930         err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
931                               vnet_versions, ARRAY_SIZE(vnet_versions),
932                               &vnet_vio_ops, vp->dev->name);
933         if (err)
934                 goto err_out_free_port;
935
936         err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
937         if (err)
938                 goto err_out_free_port;
939
940         err = vnet_port_alloc_tx_bufs(port);
941         if (err)
942                 goto err_out_free_ldc;
943
944         INIT_HLIST_NODE(&port->hash);
945         INIT_LIST_HEAD(&port->list);
946
947         switch_port = 0;
948         if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
949                 switch_port = 1;
950
951         spin_lock_irqsave(&vp->lock, flags);
952         if (switch_port)
953                 list_add(&port->list, &vp->port_list);
954         else
955                 list_add_tail(&port->list, &vp->port_list);
956         hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
957         spin_unlock_irqrestore(&vp->lock, flags);
958
959         dev_set_drvdata(&vdev->dev, port);
960
961         printk(KERN_INFO "%s: PORT ( remote-mac ", vp->dev->name);
962         for (i = 0; i < 6; i++)
963                 printk("%2.2x%c", port->raddr[i], i == 5 ? ' ' : ':');
964         if (switch_port)
965                 printk("switch-port ");
966         printk(")\n");
967
968         vio_port_up(&port->vio);
969
970         mdesc_release(hp);
971
972         return 0;
973
974 err_out_free_ldc:
975         vio_ldc_free(&port->vio);
976
977 err_out_free_port:
978         kfree(port);
979
980 err_out_put_mdesc:
981         mdesc_release(hp);
982         return err;
983 }
984
985 static int vnet_port_remove(struct vio_dev *vdev)
986 {
987         struct vnet_port *port = dev_get_drvdata(&vdev->dev);
988
989         if (port) {
990                 struct vnet *vp = port->vp;
991                 unsigned long flags;
992
993                 del_timer_sync(&port->vio.timer);
994
995                 spin_lock_irqsave(&vp->lock, flags);
996                 list_del(&port->list);
997                 hlist_del(&port->hash);
998                 spin_unlock_irqrestore(&vp->lock, flags);
999
1000                 vnet_port_free_tx_bufs(port);
1001                 vio_ldc_free(&port->vio);
1002
1003                 dev_set_drvdata(&vdev->dev, NULL);
1004
1005                 kfree(port);
1006         }
1007         return 0;
1008 }
1009
1010 static struct vio_device_id vnet_port_match[] = {
1011         {
1012                 .type = "vnet-port",
1013         },
1014         {},
1015 };
1016 MODULE_DEVICE_TABLE(vio, vnet_match);
1017
1018 static struct vio_driver vnet_port_driver = {
1019         .id_table       = vnet_port_match,
1020         .probe          = vnet_port_probe,
1021         .remove         = vnet_port_remove,
1022         .driver         = {
1023                 .name   = "vnet_port",
1024                 .owner  = THIS_MODULE,
1025         }
1026 };
1027
1028 const char *local_mac_prop = "local-mac-address";
1029
1030 static int __devinit vnet_probe(struct vio_dev *vdev,
1031                                 const struct vio_device_id *id)
1032 {
1033         static int vnet_version_printed;
1034         struct mdesc_handle *hp;
1035         struct net_device *dev;
1036         struct vnet *vp;
1037         const u64 *mac;
1038         int err, i, len;
1039
1040         if (vnet_version_printed++ == 0)
1041                 printk(KERN_INFO "%s", version);
1042
1043         hp = mdesc_grab();
1044
1045         mac = mdesc_get_property(hp, vdev->mp, local_mac_prop, &len);
1046         if (!mac) {
1047                 printk(KERN_ERR PFX "vnet lacks %s property.\n",
1048                        local_mac_prop);
1049                 err = -ENODEV;
1050                 goto err_out;
1051         }
1052
1053         dev = alloc_etherdev(sizeof(*vp));
1054         if (!dev) {
1055                 printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n");
1056                 err = -ENOMEM;
1057                 goto err_out;
1058         }
1059
1060         for (i = 0; i < ETH_ALEN; i++)
1061                 dev->dev_addr[i] = (*mac >> (5 - i) * 8) & 0xff;
1062
1063         memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
1064
1065         SET_NETDEV_DEV(dev, &vdev->dev);
1066
1067         vp = netdev_priv(dev);
1068
1069         spin_lock_init(&vp->lock);
1070         vp->dev = dev;
1071         vp->vdev = vdev;
1072
1073         INIT_LIST_HEAD(&vp->port_list);
1074         for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1075                 INIT_HLIST_HEAD(&vp->port_hash[i]);
1076
1077         dev->open = vnet_open;
1078         dev->stop = vnet_close;
1079         dev->set_multicast_list = vnet_set_rx_mode;
1080         dev->set_mac_address = vnet_set_mac_addr;
1081         dev->tx_timeout = vnet_tx_timeout;
1082         dev->ethtool_ops = &vnet_ethtool_ops;
1083         dev->watchdog_timeo = VNET_TX_TIMEOUT;
1084         dev->change_mtu = vnet_change_mtu;
1085         dev->hard_start_xmit = vnet_start_xmit;
1086
1087         err = register_netdev(dev);
1088         if (err) {
1089                 printk(KERN_ERR PFX "Cannot register net device, "
1090                        "aborting.\n");
1091                 goto err_out_free_dev;
1092         }
1093
1094         printk(KERN_INFO "%s: Sun LDOM vnet ", dev->name);
1095
1096         for (i = 0; i < 6; i++)
1097                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
1098
1099         dev_set_drvdata(&vdev->dev, vp);
1100
1101         mdesc_release(hp);
1102
1103         return 0;
1104
1105 err_out_free_dev:
1106         free_netdev(dev);
1107
1108 err_out:
1109         mdesc_release(hp);
1110         return err;
1111 }
1112
1113 static int vnet_remove(struct vio_dev *vdev)
1114 {
1115
1116         struct vnet *vp = dev_get_drvdata(&vdev->dev);
1117
1118         if (vp) {
1119                 /* XXX unregister port, or at least check XXX */
1120                 unregister_netdevice(vp->dev);
1121                 dev_set_drvdata(&vdev->dev, NULL);
1122         }
1123         return 0;
1124 }
1125
1126 static struct vio_device_id vnet_match[] = {
1127         {
1128                 .type = "network",
1129         },
1130         {},
1131 };
1132 MODULE_DEVICE_TABLE(vio, vnet_match);
1133
1134 static struct vio_driver vnet_driver = {
1135         .id_table       = vnet_match,
1136         .probe          = vnet_probe,
1137         .remove         = vnet_remove,
1138         .driver         = {
1139                 .name   = "vnet",
1140                 .owner  = THIS_MODULE,
1141         }
1142 };
1143
1144 static int __init vnet_init(void)
1145 {
1146         int err = vio_register_driver(&vnet_driver);
1147
1148         if (!err) {
1149                 err = vio_register_driver(&vnet_port_driver);
1150                 if (err)
1151                         vio_unregister_driver(&vnet_driver);
1152         }
1153
1154         return err;
1155 }
1156
1157 static void __exit vnet_exit(void)
1158 {
1159         vio_unregister_driver(&vnet_port_driver);
1160         vio_unregister_driver(&vnet_driver);
1161 }
1162
1163 module_init(vnet_init);
1164 module_exit(vnet_exit);