1 /* sunvnet.c: Sun LDOM Virtual Network Driver.
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
24 #define DRV_MODULE_NAME "sunvnet"
25 #define DRV_MODULE_VERSION "1.0"
26 #define DRV_MODULE_RELDATE "June 25, 2007"
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);
35 /* Heuristic for the number of times to exponentially backoff and
36 * retry sending an LDC trigger when EAGAIN is encountered
38 #define VNET_MAX_RETRIES 10
40 /* Ordered from largest major to lowest */
41 static struct vio_version vnet_versions[] = {
42 { .major = 1, .minor = 0 },
45 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
47 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
50 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
52 struct vio_msg_tag *pkt = arg;
54 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
55 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
56 pr_err("Resetting connection\n");
58 ldc_disconnect(port->vio.lp);
63 static int vnet_send_attr(struct vio_driver_state *vio)
65 struct vnet_port *port = to_vnet_port(vio);
66 struct net_device *dev = port->vp->dev;
67 struct vio_net_attr_info pkt;
70 memset(&pkt, 0, sizeof(pkt));
71 pkt.tag.type = VIO_TYPE_CTRL;
72 pkt.tag.stype = VIO_SUBTYPE_INFO;
73 pkt.tag.stype_env = VIO_ATTR_INFO;
74 pkt.tag.sid = vio_send_sid(vio);
75 pkt.xfer_mode = VIO_DRING_MODE;
76 pkt.addr_type = VNET_ADDR_ETHERMAC;
78 for (i = 0; i < 6; i++)
79 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
80 pkt.mtu = ETH_FRAME_LEN;
82 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
83 "ackfreq[%u] mtu[%llu]\n",
84 pkt.xfer_mode, pkt.addr_type,
85 (unsigned long long) pkt.addr,
87 (unsigned long long) pkt.mtu);
89 return vio_ldc_send(vio, &pkt, sizeof(pkt));
92 static int handle_attr_info(struct vio_driver_state *vio,
93 struct vio_net_attr_info *pkt)
95 viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
96 "ackfreq[%u] mtu[%llu]\n",
97 pkt->xfer_mode, pkt->addr_type,
98 (unsigned long long) pkt->addr,
100 (unsigned long long) pkt->mtu);
102 pkt->tag.sid = vio_send_sid(vio);
104 if (pkt->xfer_mode != VIO_DRING_MODE ||
105 pkt->addr_type != VNET_ADDR_ETHERMAC ||
106 pkt->mtu != ETH_FRAME_LEN) {
107 viodbg(HS, "SEND NET ATTR NACK\n");
109 pkt->tag.stype = VIO_SUBTYPE_NACK;
111 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
115 viodbg(HS, "SEND NET ATTR ACK\n");
117 pkt->tag.stype = VIO_SUBTYPE_ACK;
119 return vio_ldc_send(vio, pkt, sizeof(*pkt));
124 static int handle_attr_ack(struct vio_driver_state *vio,
125 struct vio_net_attr_info *pkt)
127 viodbg(HS, "GOT NET ATTR ACK\n");
132 static int handle_attr_nack(struct vio_driver_state *vio,
133 struct vio_net_attr_info *pkt)
135 viodbg(HS, "GOT NET ATTR NACK\n");
140 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
142 struct vio_net_attr_info *pkt = arg;
144 switch (pkt->tag.stype) {
145 case VIO_SUBTYPE_INFO:
146 return handle_attr_info(vio, pkt);
148 case VIO_SUBTYPE_ACK:
149 return handle_attr_ack(vio, pkt);
151 case VIO_SUBTYPE_NACK:
152 return handle_attr_nack(vio, pkt);
159 static void vnet_handshake_complete(struct vio_driver_state *vio)
161 struct vio_dring_state *dr;
163 dr = &vio->drings[VIO_DRIVER_RX_RING];
164 dr->snd_nxt = dr->rcv_nxt = 1;
166 dr = &vio->drings[VIO_DRIVER_TX_RING];
167 dr->snd_nxt = dr->rcv_nxt = 1;
170 /* The hypervisor interface that implements copying to/from imported
171 * memory from another domain requires that copies are done to 8-byte
172 * aligned buffers, and that the lengths of such copies are also 8-byte
175 * So we align skb->data to an 8-byte multiple and pad-out the data
176 * area so we can round the copy length up to the next multiple of
179 * The transmitter puts the actual start of the packet 6 bytes into
180 * the buffer it sends over, so that the IP headers after the ethernet
181 * header are aligned properly. These 6 bytes are not in the descriptor
182 * length, they are simply implied. This offset is represented using
183 * the VNET_PACKET_SKIP macro.
185 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
188 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
189 unsigned long addr, off;
194 addr = (unsigned long) skb->data;
195 off = ((addr + 7UL) & ~7UL) - addr;
197 skb_reserve(skb, off);
202 static int vnet_rx_one(struct vnet_port *port, unsigned int len,
203 struct ldc_trans_cookie *cookies, int ncookies)
205 struct net_device *dev = port->vp->dev;
206 unsigned int copy_len;
211 if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
212 dev->stats.rx_length_errors++;
216 skb = alloc_and_align_skb(dev, len);
218 if (unlikely(!skb)) {
219 dev->stats.rx_missed_errors++;
223 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
224 skb_put(skb, copy_len);
225 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
226 skb->data, copy_len, 0,
228 if (unlikely(err < 0)) {
229 dev->stats.rx_frame_errors++;
233 skb_pull(skb, VNET_PACKET_SKIP);
235 skb->protocol = eth_type_trans(skb, dev);
237 dev->stats.rx_packets++;
238 dev->stats.rx_bytes += len;
248 dev->stats.rx_dropped++;
252 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
253 u32 start, u32 end, u8 vio_dring_state)
255 struct vio_dring_data hdr = {
257 .type = VIO_TYPE_DATA,
258 .stype = VIO_SUBTYPE_ACK,
259 .stype_env = VIO_DRING_DATA,
260 .sid = vio_send_sid(&port->vio),
262 .dring_ident = dr->ident,
265 .state = vio_dring_state,
270 hdr.seq = dr->snd_nxt;
273 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
279 if ((delay <<= 1) > 128)
281 if (retries++ > VNET_MAX_RETRIES) {
282 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
283 port->raddr[0], port->raddr[1],
284 port->raddr[2], port->raddr[3],
285 port->raddr[4], port->raddr[5]);
288 } while (err == -EAGAIN);
293 static u32 next_idx(u32 idx, struct vio_dring_state *dr)
295 if (++idx == dr->num_entries)
300 static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
303 idx = dr->num_entries - 1;
310 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
311 struct vio_dring_state *dr,
314 struct vio_net_desc *desc = port->vio.desc_buf;
317 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
318 (index * dr->entry_size),
319 dr->cookies, dr->ncookies);
326 static int put_rx_desc(struct vnet_port *port,
327 struct vio_dring_state *dr,
328 struct vio_net_desc *desc,
333 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
334 (index * dr->entry_size),
335 dr->cookies, dr->ncookies);
342 static int vnet_walk_rx_one(struct vnet_port *port,
343 struct vio_dring_state *dr,
344 u32 index, int *needs_ack)
346 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
347 struct vio_driver_state *vio = &port->vio;
351 return PTR_ERR(desc);
353 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
354 desc->hdr.state, desc->hdr.ack,
355 desc->size, desc->ncookies,
356 desc->cookies[0].cookie_addr,
357 desc->cookies[0].cookie_size);
359 if (desc->hdr.state != VIO_DESC_READY)
361 err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
362 if (err == -ECONNRESET)
364 desc->hdr.state = VIO_DESC_DONE;
365 err = put_rx_desc(port, dr, desc, index);
368 *needs_ack = desc->hdr.ack;
372 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
375 struct vio_driver_state *vio = &port->vio;
376 int ack_start = -1, ack_end = -1;
378 end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
380 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
382 while (start != end) {
383 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
384 if (err == -ECONNRESET)
391 start = next_idx(start, dr);
392 if (ack && start != end) {
393 err = vnet_send_ack(port, dr, ack_start, ack_end,
395 if (err == -ECONNRESET)
400 if (unlikely(ack_start == -1))
401 ack_start = ack_end = prev_idx(start, dr);
402 return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
405 static int vnet_rx(struct vnet_port *port, void *msgbuf)
407 struct vio_dring_data *pkt = msgbuf;
408 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
409 struct vio_driver_state *vio = &port->vio;
411 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
412 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
414 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
416 if (unlikely(pkt->seq != dr->rcv_nxt)) {
417 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
418 pkt->seq, dr->rcv_nxt);
424 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
426 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
429 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
434 while (idx != dr->prod) {
439 idx = next_idx(idx, dr);
444 static int vnet_ack(struct vnet_port *port, void *msgbuf)
446 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
447 struct vio_dring_data *pkt = msgbuf;
448 struct net_device *dev;
452 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
456 if (unlikely(!idx_is_pending(dr, end)))
459 dr->cons = next_idx(end, dr);
463 if (unlikely(netif_queue_stopped(dev) &&
464 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
470 static int vnet_nack(struct vnet_port *port, void *msgbuf)
472 /* XXX just reset or similar XXX */
476 static int handle_mcast(struct vnet_port *port, void *msgbuf)
478 struct vio_net_mcast_info *pkt = msgbuf;
480 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
481 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
491 static void maybe_tx_wakeup(struct vnet *vp)
493 struct net_device *dev = vp->dev;
496 if (likely(netif_queue_stopped(dev))) {
497 struct vnet_port *port;
500 list_for_each_entry(port, &vp->port_list, list) {
501 struct vio_dring_state *dr;
503 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
504 if (vnet_tx_dring_avail(dr) <
505 VNET_TX_WAKEUP_THRESH(dr)) {
511 netif_wake_queue(dev);
513 netif_tx_unlock(dev);
516 static void vnet_event(void *arg, int event)
518 struct vnet_port *port = arg;
519 struct vio_driver_state *vio = &port->vio;
523 spin_lock_irqsave(&vio->lock, flags);
525 if (unlikely(event == LDC_EVENT_RESET ||
526 event == LDC_EVENT_UP)) {
527 vio_link_state_change(vio, event);
528 spin_unlock_irqrestore(&vio->lock, flags);
530 if (event == LDC_EVENT_RESET)
535 if (unlikely(event != LDC_EVENT_DATA_READY)) {
536 pr_warning("Unexpected LDC event %d\n", event);
537 spin_unlock_irqrestore(&vio->lock, flags);
544 struct vio_msg_tag tag;
548 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
549 if (unlikely(err < 0)) {
550 if (err == -ECONNRESET)
556 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
559 msgbuf.tag.stype_env,
561 err = vio_validate_sid(vio, &msgbuf.tag);
565 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
566 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
567 err = vnet_rx(port, &msgbuf);
568 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
569 err = vnet_ack(port, &msgbuf);
572 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
573 err = vnet_nack(port, &msgbuf);
575 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
576 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
577 err = handle_mcast(port, &msgbuf);
579 err = vio_control_pkt_engine(vio, &msgbuf);
583 err = vnet_handle_unknown(port, &msgbuf);
585 if (err == -ECONNRESET)
588 spin_unlock(&vio->lock);
589 if (unlikely(tx_wakeup && err != -ECONNRESET))
590 maybe_tx_wakeup(port->vp);
591 local_irq_restore(flags);
594 static int __vnet_tx_trigger(struct vnet_port *port)
596 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
597 struct vio_dring_data hdr = {
599 .type = VIO_TYPE_DATA,
600 .stype = VIO_SUBTYPE_INFO,
601 .stype_env = VIO_DRING_DATA,
602 .sid = vio_send_sid(&port->vio),
604 .dring_ident = dr->ident,
605 .start_idx = dr->prod,
611 hdr.seq = dr->snd_nxt;
614 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
620 if ((delay <<= 1) > 128)
622 if (retries++ > VNET_MAX_RETRIES)
624 } while (err == -EAGAIN);
629 static inline bool port_is_up(struct vnet_port *vnet)
631 struct vio_driver_state *vio = &vnet->vio;
633 return !!(vio->hs_state & VIO_HS_COMPLETE);
636 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
638 unsigned int hash = vnet_hashfn(skb->data);
639 struct hlist_head *hp = &vp->port_hash[hash];
640 struct vnet_port *port;
642 hlist_for_each_entry(port, hp, hash) {
643 if (!port_is_up(port))
645 if (ether_addr_equal(port->raddr, skb->data))
648 list_for_each_entry(port, &vp->port_list, list) {
649 if (!port->switch_port)
651 if (!port_is_up(port))
658 struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
660 struct vnet_port *ret;
663 spin_lock_irqsave(&vp->lock, flags);
664 ret = __tx_port_find(vp, skb);
665 spin_unlock_irqrestore(&vp->lock, flags);
670 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
672 struct vnet *vp = netdev_priv(dev);
673 struct vnet_port *port = tx_port_find(vp, skb);
674 struct vio_dring_state *dr;
675 struct vio_net_desc *d;
684 spin_lock_irqsave(&port->vio.lock, flags);
686 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
687 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
688 if (!netif_queue_stopped(dev)) {
689 netif_stop_queue(dev);
691 /* This is a hard error, log it. */
692 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
693 dev->stats.tx_errors++;
695 spin_unlock_irqrestore(&port->vio.lock, flags);
696 return NETDEV_TX_BUSY;
699 d = vio_dring_cur(dr);
701 tx_buf = port->tx_bufs[dr->prod].buf;
702 skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
705 if (len < ETH_ZLEN) {
707 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
710 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
711 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
712 * the protocol itself does not require it as long as the peer
713 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
715 * An ACK for every packet in the ring is expensive as the
716 * sending of LDC messages is slow and affects performance.
718 d->hdr.ack = VIO_ACK_DISABLE;
720 d->ncookies = port->tx_bufs[dr->prod].ncookies;
721 for (i = 0; i < d->ncookies; i++)
722 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
724 /* This has to be a non-SMP write barrier because we are writing
725 * to memory which is shared with the peer LDOM.
729 d->hdr.state = VIO_DESC_READY;
731 err = __vnet_tx_trigger(port);
732 if (unlikely(err < 0)) {
733 netdev_info(dev, "TX trigger error %d\n", err);
734 d->hdr.state = VIO_DESC_FREE;
735 dev->stats.tx_carrier_errors++;
736 goto out_dropped_unlock;
739 dev->stats.tx_packets++;
740 dev->stats.tx_bytes += skb->len;
742 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
743 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
744 netif_stop_queue(dev);
745 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
746 netif_wake_queue(dev);
749 spin_unlock_irqrestore(&port->vio.lock, flags);
756 spin_unlock_irqrestore(&port->vio.lock, flags);
760 dev->stats.tx_dropped++;
764 static void vnet_tx_timeout(struct net_device *dev)
766 /* XXX Implement me XXX */
769 static int vnet_open(struct net_device *dev)
771 netif_carrier_on(dev);
772 netif_start_queue(dev);
777 static int vnet_close(struct net_device *dev)
779 netif_stop_queue(dev);
780 netif_carrier_off(dev);
785 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
787 struct vnet_mcast_entry *m;
789 for (m = vp->mcast_list; m; m = m->next) {
790 if (ether_addr_equal(m->addr, addr))
796 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
798 struct netdev_hw_addr *ha;
800 netdev_for_each_mc_addr(ha, dev) {
801 struct vnet_mcast_entry *m;
803 m = __vnet_mc_find(vp, ha->addr);
810 m = kzalloc(sizeof(*m), GFP_ATOMIC);
813 memcpy(m->addr, ha->addr, ETH_ALEN);
816 m->next = vp->mcast_list;
822 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
824 struct vio_net_mcast_info info;
825 struct vnet_mcast_entry *m, **pp;
828 memset(&info, 0, sizeof(info));
830 info.tag.type = VIO_TYPE_CTRL;
831 info.tag.stype = VIO_SUBTYPE_INFO;
832 info.tag.stype_env = VNET_MCAST_INFO;
833 info.tag.sid = vio_send_sid(&port->vio);
837 for (m = vp->mcast_list; m; m = m->next) {
841 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
843 if (++n_addrs == VNET_NUM_MCAST) {
844 info.count = n_addrs;
846 (void) vio_ldc_send(&port->vio, &info,
852 info.count = n_addrs;
853 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
859 pp = &vp->mcast_list;
860 while ((m = *pp) != NULL) {
867 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
869 if (++n_addrs == VNET_NUM_MCAST) {
870 info.count = n_addrs;
871 (void) vio_ldc_send(&port->vio, &info,
880 info.count = n_addrs;
881 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
885 static void vnet_set_rx_mode(struct net_device *dev)
887 struct vnet *vp = netdev_priv(dev);
888 struct vnet_port *port;
891 spin_lock_irqsave(&vp->lock, flags);
892 if (!list_empty(&vp->port_list)) {
893 port = list_entry(vp->port_list.next, struct vnet_port, list);
895 if (port->switch_port) {
896 __update_mc_list(vp, dev);
897 __send_mc_list(vp, port);
900 spin_unlock_irqrestore(&vp->lock, flags);
903 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
905 if (new_mtu != ETH_DATA_LEN)
912 static int vnet_set_mac_addr(struct net_device *dev, void *p)
917 static void vnet_get_drvinfo(struct net_device *dev,
918 struct ethtool_drvinfo *info)
920 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
921 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
924 static u32 vnet_get_msglevel(struct net_device *dev)
926 struct vnet *vp = netdev_priv(dev);
927 return vp->msg_enable;
930 static void vnet_set_msglevel(struct net_device *dev, u32 value)
932 struct vnet *vp = netdev_priv(dev);
933 vp->msg_enable = value;
936 static const struct ethtool_ops vnet_ethtool_ops = {
937 .get_drvinfo = vnet_get_drvinfo,
938 .get_msglevel = vnet_get_msglevel,
939 .set_msglevel = vnet_set_msglevel,
940 .get_link = ethtool_op_get_link,
943 static void vnet_port_free_tx_bufs(struct vnet_port *port)
945 struct vio_dring_state *dr;
948 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
950 ldc_free_exp_dring(port->vio.lp, dr->base,
951 (dr->entry_size * dr->num_entries),
952 dr->cookies, dr->ncookies);
960 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
961 void *buf = port->tx_bufs[i].buf;
966 ldc_unmap(port->vio.lp,
967 port->tx_bufs[i].cookies,
968 port->tx_bufs[i].ncookies);
971 port->tx_bufs[i].buf = NULL;
975 static int vnet_port_alloc_tx_bufs(struct vnet_port *port)
977 struct vio_dring_state *dr;
979 int i, err, ncookies;
982 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
983 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
984 int map_len = (ETH_FRAME_LEN + 7) & ~7;
991 if ((unsigned long)buf & (8UL - 1)) {
992 pr_err("TX buffer misaligned\n");
997 err = ldc_map_single(port->vio.lp, buf, map_len,
998 port->tx_bufs[i].cookies, 2,
1006 port->tx_bufs[i].buf = buf;
1007 port->tx_bufs[i].ncookies = err;
1010 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1012 len = (VNET_TX_RING_SIZE *
1013 (sizeof(struct vio_net_desc) +
1014 (sizeof(struct ldc_trans_cookie) * 2)));
1016 ncookies = VIO_MAX_RING_COOKIES;
1017 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1018 dr->cookies, &ncookies,
1022 if (IS_ERR(dring)) {
1023 err = PTR_ERR(dring);
1028 dr->entry_size = (sizeof(struct vio_net_desc) +
1029 (sizeof(struct ldc_trans_cookie) * 2));
1030 dr->num_entries = VNET_TX_RING_SIZE;
1031 dr->prod = dr->cons = 0;
1032 dr->pending = VNET_TX_RING_SIZE;
1033 dr->ncookies = ncookies;
1038 vnet_port_free_tx_bufs(port);
1043 static LIST_HEAD(vnet_list);
1044 static DEFINE_MUTEX(vnet_list_mutex);
1046 static const struct net_device_ops vnet_ops = {
1047 .ndo_open = vnet_open,
1048 .ndo_stop = vnet_close,
1049 .ndo_set_rx_mode = vnet_set_rx_mode,
1050 .ndo_set_mac_address = vnet_set_mac_addr,
1051 .ndo_validate_addr = eth_validate_addr,
1052 .ndo_tx_timeout = vnet_tx_timeout,
1053 .ndo_change_mtu = vnet_change_mtu,
1054 .ndo_start_xmit = vnet_start_xmit,
1057 static struct vnet *vnet_new(const u64 *local_mac)
1059 struct net_device *dev;
1063 dev = alloc_etherdev(sizeof(*vp));
1065 return ERR_PTR(-ENOMEM);
1067 for (i = 0; i < ETH_ALEN; i++)
1068 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1070 vp = netdev_priv(dev);
1072 spin_lock_init(&vp->lock);
1075 INIT_LIST_HEAD(&vp->port_list);
1076 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1077 INIT_HLIST_HEAD(&vp->port_hash[i]);
1078 INIT_LIST_HEAD(&vp->list);
1079 vp->local_mac = *local_mac;
1081 dev->netdev_ops = &vnet_ops;
1082 dev->ethtool_ops = &vnet_ethtool_ops;
1083 dev->watchdog_timeo = VNET_TX_TIMEOUT;
1085 err = register_netdev(dev);
1087 pr_err("Cannot register net device, aborting\n");
1088 goto err_out_free_dev;
1091 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
1093 list_add(&vp->list, &vnet_list);
1100 return ERR_PTR(err);
1103 static struct vnet *vnet_find_or_create(const u64 *local_mac)
1105 struct vnet *iter, *vp;
1107 mutex_lock(&vnet_list_mutex);
1109 list_for_each_entry(iter, &vnet_list, list) {
1110 if (iter->local_mac == *local_mac) {
1116 vp = vnet_new(local_mac);
1117 mutex_unlock(&vnet_list_mutex);
1122 static void vnet_cleanup(void)
1125 struct net_device *dev;
1127 mutex_lock(&vnet_list_mutex);
1128 while (!list_empty(&vnet_list)) {
1129 vp = list_first_entry(&vnet_list, struct vnet, list);
1130 list_del(&vp->list);
1132 /* vio_unregister_driver() should have cleaned up port_list */
1133 BUG_ON(!list_empty(&vp->port_list));
1134 unregister_netdev(dev);
1137 mutex_unlock(&vnet_list_mutex);
1140 static const char *local_mac_prop = "local-mac-address";
1142 static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
1145 const u64 *local_mac = NULL;
1148 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1149 u64 target = mdesc_arc_target(hp, a);
1152 name = mdesc_get_property(hp, target, "name", NULL);
1153 if (!name || strcmp(name, "network"))
1156 local_mac = mdesc_get_property(hp, target,
1157 local_mac_prop, NULL);
1162 return ERR_PTR(-ENODEV);
1164 return vnet_find_or_create(local_mac);
1167 static struct ldc_channel_config vnet_ldc_cfg = {
1168 .event = vnet_event,
1170 .mode = LDC_MODE_UNRELIABLE,
1173 static struct vio_driver_ops vnet_vio_ops = {
1174 .send_attr = vnet_send_attr,
1175 .handle_attr = vnet_handle_attr,
1176 .handshake_complete = vnet_handshake_complete,
1179 static void print_version(void)
1181 printk_once(KERN_INFO "%s", version);
1184 const char *remote_macaddr_prop = "remote-mac-address";
1186 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1188 struct mdesc_handle *hp;
1189 struct vnet_port *port;
1190 unsigned long flags;
1193 int len, i, err, switch_port;
1199 vp = vnet_find_parent(hp, vdev->mp);
1201 pr_err("Cannot find port parent vnet\n");
1203 goto err_out_put_mdesc;
1206 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1209 pr_err("Port lacks %s property\n", remote_macaddr_prop);
1210 goto err_out_put_mdesc;
1213 port = kzalloc(sizeof(*port), GFP_KERNEL);
1216 goto err_out_put_mdesc;
1218 for (i = 0; i < ETH_ALEN; i++)
1219 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1223 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1224 vnet_versions, ARRAY_SIZE(vnet_versions),
1225 &vnet_vio_ops, vp->dev->name);
1227 goto err_out_free_port;
1229 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1231 goto err_out_free_port;
1233 err = vnet_port_alloc_tx_bufs(port);
1235 goto err_out_free_ldc;
1237 INIT_HLIST_NODE(&port->hash);
1238 INIT_LIST_HEAD(&port->list);
1241 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1243 port->switch_port = switch_port;
1245 spin_lock_irqsave(&vp->lock, flags);
1247 list_add(&port->list, &vp->port_list);
1249 list_add_tail(&port->list, &vp->port_list);
1250 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1251 spin_unlock_irqrestore(&vp->lock, flags);
1253 dev_set_drvdata(&vdev->dev, port);
1255 pr_info("%s: PORT ( remote-mac %pM%s )\n",
1256 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
1258 vio_port_up(&port->vio);
1265 vio_ldc_free(&port->vio);
1275 static int vnet_port_remove(struct vio_dev *vdev)
1277 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1280 struct vnet *vp = port->vp;
1281 unsigned long flags;
1283 del_timer_sync(&port->vio.timer);
1285 spin_lock_irqsave(&vp->lock, flags);
1286 list_del(&port->list);
1287 hlist_del(&port->hash);
1288 spin_unlock_irqrestore(&vp->lock, flags);
1290 vnet_port_free_tx_bufs(port);
1291 vio_ldc_free(&port->vio);
1293 dev_set_drvdata(&vdev->dev, NULL);
1301 static const struct vio_device_id vnet_port_match[] = {
1303 .type = "vnet-port",
1307 MODULE_DEVICE_TABLE(vio, vnet_port_match);
1309 static struct vio_driver vnet_port_driver = {
1310 .id_table = vnet_port_match,
1311 .probe = vnet_port_probe,
1312 .remove = vnet_port_remove,
1313 .name = "vnet_port",
1316 static int __init vnet_init(void)
1318 return vio_register_driver(&vnet_port_driver);
1321 static void __exit vnet_exit(void)
1323 vio_unregister_driver(&vnet_port_driver);
1327 module_init(vnet_init);
1328 module_exit(vnet_exit);