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>
18 #include <linux/highmem.h>
19 #include <linux/if_vlan.h>
21 #if IS_ENABLED(CONFIG_IPV6)
22 #include <linux/icmpv6.h>
27 #include <net/route.h>
34 #define DRV_MODULE_NAME "sunvnet"
35 #define DRV_MODULE_VERSION "1.0"
36 #define DRV_MODULE_RELDATE "June 25, 2007"
38 static char version[] =
39 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
40 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
41 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
42 MODULE_LICENSE("GPL");
43 MODULE_VERSION(DRV_MODULE_VERSION);
45 #define VNET_MAX_TXQS 16
47 /* Heuristic for the number of times to exponentially backoff and
48 * retry sending an LDC trigger when EAGAIN is encountered
50 #define VNET_MAX_RETRIES 10
52 static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
53 static void vnet_port_reset(struct vnet_port *port);
55 /* Ordered from largest major to lowest */
56 static struct vio_version vnet_versions[] = {
57 { .major = 1, .minor = 8 },
58 { .major = 1, .minor = 7 },
59 { .major = 1, .minor = 6 },
60 { .major = 1, .minor = 0 },
63 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
65 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
68 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
70 struct vio_msg_tag *pkt = arg;
72 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
73 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
74 pr_err("Resetting connection\n");
76 ldc_disconnect(port->vio.lp);
81 static int vnet_port_alloc_tx_ring(struct vnet_port *port);
83 static int vnet_send_attr(struct vio_driver_state *vio)
85 struct vnet_port *port = to_vnet_port(vio);
86 struct net_device *dev = port->vp->dev;
87 struct vio_net_attr_info pkt;
88 int framelen = ETH_FRAME_LEN;
91 err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
95 memset(&pkt, 0, sizeof(pkt));
96 pkt.tag.type = VIO_TYPE_CTRL;
97 pkt.tag.stype = VIO_SUBTYPE_INFO;
98 pkt.tag.stype_env = VIO_ATTR_INFO;
99 pkt.tag.sid = vio_send_sid(vio);
100 if (vio_version_before(vio, 1, 2))
101 pkt.xfer_mode = VIO_DRING_MODE;
103 pkt.xfer_mode = VIO_NEW_DRING_MODE;
104 pkt.addr_type = VNET_ADDR_ETHERMAC;
106 for (i = 0; i < 6; i++)
107 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
108 if (vio_version_after(vio, 1, 3)) {
110 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
111 pkt.mtu = port->rmtu;
113 port->rmtu = VNET_MAXPACKET;
114 pkt.mtu = port->rmtu;
116 if (vio_version_after_eq(vio, 1, 6))
117 pkt.options = VIO_TX_DRING;
118 } else if (vio_version_before(vio, 1, 3)) {
121 pkt.mtu = framelen + VLAN_HLEN;
125 if (vio_version_after_eq(vio, 1, 7) && port->tso) {
126 pkt.cflags |= VNET_LSO_IPV4_CAPAB;
128 port->tsolen = VNET_MAXTSO;
129 pkt.ipv4_lso_maxlen = port->tsolen;
132 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
134 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
135 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
136 "cflags[0x%04x] lso_max[%u]\n",
137 pkt.xfer_mode, pkt.addr_type,
138 (unsigned long long)pkt.addr,
139 pkt.ack_freq, pkt.plnk_updt, pkt.options,
140 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
143 return vio_ldc_send(vio, &pkt, sizeof(pkt));
146 static int handle_attr_info(struct vio_driver_state *vio,
147 struct vio_net_attr_info *pkt)
149 struct vnet_port *port = to_vnet_port(vio);
153 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
154 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
155 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
156 pkt->xfer_mode, pkt->addr_type,
157 (unsigned long long)pkt->addr,
158 pkt->ack_freq, pkt->plnk_updt, pkt->options,
159 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
160 pkt->ipv4_lso_maxlen);
162 pkt->tag.sid = vio_send_sid(vio);
164 xfer_mode = pkt->xfer_mode;
165 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
166 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
167 xfer_mode = VIO_NEW_DRING_MODE;
170 * < v1.3 - ETH_FRAME_LEN exactly
171 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
173 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
175 if (vio_version_before(vio, 1, 3)) {
176 localmtu = ETH_FRAME_LEN;
177 } else if (vio_version_after(vio, 1, 3)) {
178 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
179 localmtu = min(pkt->mtu, localmtu);
182 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
184 port->rmtu = localmtu;
186 /* LSO negotiation */
187 if (vio_version_after_eq(vio, 1, 7))
188 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
193 port->tsolen = VNET_MAXTSO;
194 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
195 if (port->tsolen < VNET_MINTSO) {
198 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
200 pkt->ipv4_lso_maxlen = port->tsolen;
202 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
203 pkt->ipv4_lso_maxlen = 0;
206 /* for version >= 1.6, ACK packet mode we support */
207 if (vio_version_after_eq(vio, 1, 6)) {
208 pkt->xfer_mode = VIO_NEW_DRING_MODE;
209 pkt->options = VIO_TX_DRING;
212 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
213 pkt->addr_type != VNET_ADDR_ETHERMAC ||
214 pkt->mtu != localmtu) {
215 viodbg(HS, "SEND NET ATTR NACK\n");
217 pkt->tag.stype = VIO_SUBTYPE_NACK;
219 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
223 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
224 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
225 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
226 pkt->xfer_mode, pkt->addr_type,
227 (unsigned long long)pkt->addr,
228 pkt->ack_freq, pkt->plnk_updt, pkt->options,
229 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
230 pkt->ipv4_lso_maxlen);
232 pkt->tag.stype = VIO_SUBTYPE_ACK;
234 return vio_ldc_send(vio, pkt, sizeof(*pkt));
239 static int handle_attr_ack(struct vio_driver_state *vio,
240 struct vio_net_attr_info *pkt)
242 viodbg(HS, "GOT NET ATTR ACK\n");
247 static int handle_attr_nack(struct vio_driver_state *vio,
248 struct vio_net_attr_info *pkt)
250 viodbg(HS, "GOT NET ATTR NACK\n");
255 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
257 struct vio_net_attr_info *pkt = arg;
259 switch (pkt->tag.stype) {
260 case VIO_SUBTYPE_INFO:
261 return handle_attr_info(vio, pkt);
263 case VIO_SUBTYPE_ACK:
264 return handle_attr_ack(vio, pkt);
266 case VIO_SUBTYPE_NACK:
267 return handle_attr_nack(vio, pkt);
274 static void vnet_handshake_complete(struct vio_driver_state *vio)
276 struct vio_dring_state *dr;
278 dr = &vio->drings[VIO_DRIVER_RX_RING];
279 dr->snd_nxt = dr->rcv_nxt = 1;
281 dr = &vio->drings[VIO_DRIVER_TX_RING];
282 dr->snd_nxt = dr->rcv_nxt = 1;
285 /* The hypervisor interface that implements copying to/from imported
286 * memory from another domain requires that copies are done to 8-byte
287 * aligned buffers, and that the lengths of such copies are also 8-byte
290 * So we align skb->data to an 8-byte multiple and pad-out the data
291 * area so we can round the copy length up to the next multiple of
294 * The transmitter puts the actual start of the packet 6 bytes into
295 * the buffer it sends over, so that the IP headers after the ethernet
296 * header are aligned properly. These 6 bytes are not in the descriptor
297 * length, they are simply implied. This offset is represented using
298 * the VNET_PACKET_SKIP macro.
300 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
303 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
304 unsigned long addr, off;
309 addr = (unsigned long) skb->data;
310 off = ((addr + 7UL) & ~7UL) - addr;
312 skb_reserve(skb, off);
317 static inline void vnet_fullcsum(struct sk_buff *skb)
319 struct iphdr *iph = ip_hdr(skb);
320 int offset = skb_transport_offset(skb);
322 if (skb->protocol != htons(ETH_P_IP))
324 if (iph->protocol != IPPROTO_TCP &&
325 iph->protocol != IPPROTO_UDP)
327 skb->ip_summed = CHECKSUM_NONE;
330 if (iph->protocol == IPPROTO_TCP) {
331 struct tcphdr *ptcp = tcp_hdr(skb);
334 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
335 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
336 skb->len - offset, IPPROTO_TCP,
338 } else if (iph->protocol == IPPROTO_UDP) {
339 struct udphdr *pudp = udp_hdr(skb);
342 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
343 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
344 skb->len - offset, IPPROTO_UDP,
349 static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
351 struct net_device *dev = port->vp->dev;
352 unsigned int len = desc->size;
353 unsigned int copy_len;
359 if (port->tso && port->tsolen > port->rmtu)
360 maxlen = port->tsolen;
363 if (unlikely(len < ETH_ZLEN || len > maxlen)) {
364 dev->stats.rx_length_errors++;
368 skb = alloc_and_align_skb(dev, len);
370 if (unlikely(!skb)) {
371 dev->stats.rx_missed_errors++;
375 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
376 skb_put(skb, copy_len);
377 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
378 skb->data, copy_len, 0,
379 desc->cookies, desc->ncookies);
380 if (unlikely(err < 0)) {
381 dev->stats.rx_frame_errors++;
385 skb_pull(skb, VNET_PACKET_SKIP);
387 skb->protocol = eth_type_trans(skb, dev);
389 if (vio_version_after_eq(&port->vio, 1, 8)) {
390 struct vio_net_dext *dext = vio_net_ext(desc);
392 skb_reset_network_header(skb);
394 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
395 if (skb->protocol == ETH_P_IP) {
396 struct iphdr *iph = ip_hdr(skb);
402 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
403 skb->ip_summed == CHECKSUM_NONE) {
404 if (skb->protocol == htons(ETH_P_IP)) {
405 struct iphdr *iph = ip_hdr(skb);
406 int ihl = iph->ihl * 4;
408 skb_reset_transport_header(skb);
409 skb_set_transport_header(skb, ihl);
413 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
414 skb->ip_summed = CHECKSUM_PARTIAL;
416 if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
421 skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
423 dev->stats.rx_packets++;
424 dev->stats.rx_bytes += len;
425 napi_gro_receive(&port->napi, skb);
432 dev->stats.rx_dropped++;
436 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
437 u32 start, u32 end, u8 vio_dring_state)
439 struct vio_dring_data hdr = {
441 .type = VIO_TYPE_DATA,
442 .stype = VIO_SUBTYPE_ACK,
443 .stype_env = VIO_DRING_DATA,
444 .sid = vio_send_sid(&port->vio),
446 .dring_ident = dr->ident,
449 .state = vio_dring_state,
454 hdr.seq = dr->snd_nxt;
457 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
463 if ((delay <<= 1) > 128)
465 if (retries++ > VNET_MAX_RETRIES) {
466 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
467 port->raddr[0], port->raddr[1],
468 port->raddr[2], port->raddr[3],
469 port->raddr[4], port->raddr[5]);
472 } while (err == -EAGAIN);
474 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
475 port->stop_rx_idx = end;
476 port->stop_rx = true;
478 port->stop_rx_idx = 0;
479 port->stop_rx = false;
485 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
486 struct vio_dring_state *dr,
489 struct vio_net_desc *desc = port->vio.desc_buf;
492 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
493 (index * dr->entry_size),
494 dr->cookies, dr->ncookies);
501 static int put_rx_desc(struct vnet_port *port,
502 struct vio_dring_state *dr,
503 struct vio_net_desc *desc,
508 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
509 (index * dr->entry_size),
510 dr->cookies, dr->ncookies);
517 static int vnet_walk_rx_one(struct vnet_port *port,
518 struct vio_dring_state *dr,
519 u32 index, int *needs_ack)
521 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
522 struct vio_driver_state *vio = &port->vio;
525 BUG_ON(desc == NULL);
527 return PTR_ERR(desc);
529 if (desc->hdr.state != VIO_DESC_READY)
534 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
535 desc->hdr.state, desc->hdr.ack,
536 desc->size, desc->ncookies,
537 desc->cookies[0].cookie_addr,
538 desc->cookies[0].cookie_size);
540 err = vnet_rx_one(port, desc);
541 if (err == -ECONNRESET)
543 desc->hdr.state = VIO_DESC_DONE;
544 err = put_rx_desc(port, dr, desc, index);
547 *needs_ack = desc->hdr.ack;
551 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
552 u32 start, u32 end, int *npkts, int budget)
554 struct vio_driver_state *vio = &port->vio;
555 int ack_start = -1, ack_end = -1;
556 bool send_ack = true;
558 end = (end == (u32) -1) ? vio_dring_prev(dr, start)
559 : vio_dring_next(dr, end);
561 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
563 while (start != end) {
564 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
565 if (err == -ECONNRESET)
573 start = vio_dring_next(dr, start);
574 if (ack && start != end) {
575 err = vnet_send_ack(port, dr, ack_start, ack_end,
577 if (err == -ECONNRESET)
581 if ((*npkts) >= budget) {
586 if (unlikely(ack_start == -1))
587 ack_start = ack_end = vio_dring_prev(dr, start);
589 port->napi_resume = false;
590 return vnet_send_ack(port, dr, ack_start, ack_end,
593 port->napi_resume = true;
594 port->napi_stop_idx = ack_end;
599 static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
602 struct vio_dring_data *pkt = msgbuf;
603 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
604 struct vio_driver_state *vio = &port->vio;
606 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
607 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
609 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
611 if (unlikely(pkt->seq != dr->rcv_nxt)) {
612 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
613 pkt->seq, dr->rcv_nxt);
617 if (!port->napi_resume)
620 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
622 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
626 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
631 while (idx != dr->prod) {
636 idx = vio_dring_next(dr, idx);
641 static int vnet_ack(struct vnet_port *port, void *msgbuf)
643 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
644 struct vio_dring_data *pkt = msgbuf;
645 struct net_device *dev;
648 struct vio_net_desc *desc;
649 struct netdev_queue *txq;
651 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
658 if (unlikely(!idx_is_pending(dr, end))) {
659 netif_tx_unlock(dev);
663 /* sync for race conditions with vnet_start_xmit() and tell xmit it
664 * is time to send a trigger.
666 dr->cons = vio_dring_next(dr, end);
667 desc = vio_dring_entry(dr, dr->cons);
668 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
669 /* vnet_start_xmit() just populated this dring but missed
670 * sending the "start" LDC message to the consumer.
671 * Send a "start" trigger on its behalf.
673 if (__vnet_tx_trigger(port, dr->cons) > 0)
674 port->start_cons = false;
676 port->start_cons = true;
678 port->start_cons = true;
680 netif_tx_unlock(dev);
682 txq = netdev_get_tx_queue(dev, port->q_index);
683 if (unlikely(netif_tx_queue_stopped(txq) &&
684 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
690 static int vnet_nack(struct vnet_port *port, void *msgbuf)
692 /* XXX just reset or similar XXX */
696 static int handle_mcast(struct vnet_port *port, void *msgbuf)
698 struct vio_net_mcast_info *pkt = msgbuf;
700 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
701 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
711 /* Got back a STOPPED LDC message on port. If the queue is stopped,
712 * wake it up so that we'll send out another START message at the
715 static void maybe_tx_wakeup(struct vnet_port *port)
717 struct netdev_queue *txq;
719 txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
720 __netif_tx_lock(txq, smp_processor_id());
721 if (likely(netif_tx_queue_stopped(txq))) {
722 struct vio_dring_state *dr;
724 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
725 netif_tx_wake_queue(txq);
727 __netif_tx_unlock(txq);
730 static inline bool port_is_up(struct vnet_port *vnet)
732 struct vio_driver_state *vio = &vnet->vio;
734 return !!(vio->hs_state & VIO_HS_COMPLETE);
737 static int vnet_event_napi(struct vnet_port *port, int budget)
739 struct vio_driver_state *vio = &port->vio;
742 int event = (port->rx_event & LDC_EVENT_RESET);
745 if (unlikely(event == LDC_EVENT_RESET ||
746 event == LDC_EVENT_UP)) {
747 vio_link_state_change(vio, event);
749 if (event == LDC_EVENT_RESET) {
750 vnet_port_reset(port);
756 /* We may have multiple LDC events in rx_event. Unroll send_events() */
757 event = (port->rx_event & LDC_EVENT_UP);
758 port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP);
759 if (event == LDC_EVENT_UP)
761 event = port->rx_event;
762 if (!(event & LDC_EVENT_DATA_READY))
765 /* we dont expect any other bits than RESET, UP, DATA_READY */
766 BUG_ON(event != LDC_EVENT_DATA_READY);
771 struct vio_msg_tag tag;
775 if (port->napi_resume) {
776 struct vio_dring_data *pkt =
777 (struct vio_dring_data *)&msgbuf;
778 struct vio_dring_state *dr =
779 &port->vio.drings[VIO_DRIVER_RX_RING];
781 pkt->tag.type = VIO_TYPE_DATA;
782 pkt->tag.stype = VIO_SUBTYPE_INFO;
783 pkt->tag.stype_env = VIO_DRING_DATA;
784 pkt->seq = dr->rcv_nxt;
785 pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx);
789 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
790 if (unlikely(err < 0)) {
791 if (err == -ECONNRESET)
797 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
800 msgbuf.tag.stype_env,
802 err = vio_validate_sid(vio, &msgbuf.tag);
806 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
807 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
808 if (!port_is_up(port)) {
809 /* failures like handshake_failure()
810 * may have cleaned up dring, but
811 * NAPI polling may bring us here.
816 err = vnet_rx(port, &msgbuf, &npkts, budget);
821 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
822 err = vnet_ack(port, &msgbuf);
825 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
826 err = vnet_nack(port, &msgbuf);
828 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
829 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
830 err = handle_mcast(port, &msgbuf);
832 err = vio_control_pkt_engine(vio, &msgbuf);
836 err = vnet_handle_unknown(port, &msgbuf);
838 if (err == -ECONNRESET)
841 if (unlikely(tx_wakeup && err != -ECONNRESET))
842 maybe_tx_wakeup(port);
846 static int vnet_poll(struct napi_struct *napi, int budget)
848 struct vnet_port *port = container_of(napi, struct vnet_port, napi);
849 struct vio_driver_state *vio = &port->vio;
850 int processed = vnet_event_napi(port, budget);
852 if (processed < budget) {
854 port->rx_event &= ~LDC_EVENT_DATA_READY;
855 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
860 static void vnet_event(void *arg, int event)
862 struct vnet_port *port = arg;
863 struct vio_driver_state *vio = &port->vio;
865 port->rx_event |= event;
866 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
867 napi_schedule(&port->napi);
871 static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
873 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
874 struct vio_dring_data hdr = {
876 .type = VIO_TYPE_DATA,
877 .stype = VIO_SUBTYPE_INFO,
878 .stype_env = VIO_DRING_DATA,
879 .sid = vio_send_sid(&port->vio),
881 .dring_ident = dr->ident,
889 err = vnet_send_ack(port,
890 &port->vio.drings[VIO_DRIVER_RX_RING],
891 port->stop_rx_idx, -1,
897 hdr.seq = dr->snd_nxt;
900 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
906 if ((delay <<= 1) > 128)
908 if (retries++ > VNET_MAX_RETRIES)
910 } while (err == -EAGAIN);
915 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
917 unsigned int hash = vnet_hashfn(skb->data);
918 struct hlist_head *hp = &vp->port_hash[hash];
919 struct vnet_port *port;
921 hlist_for_each_entry_rcu(port, hp, hash) {
922 if (!port_is_up(port))
924 if (ether_addr_equal(port->raddr, skb->data))
927 list_for_each_entry_rcu(port, &vp->port_list, list) {
928 if (!port->switch_port)
930 if (!port_is_up(port))
937 static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
940 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
941 struct sk_buff *skb = NULL;
947 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
948 struct vio_net_desc *d;
952 txi = VNET_TX_RING_SIZE-1;
954 d = vio_dring_entry(dr, txi);
956 if (d->hdr.state == VIO_DESC_READY) {
960 if (port->tx_bufs[txi].skb) {
961 if (d->hdr.state != VIO_DESC_DONE)
962 pr_notice("invalid ring buffer state %d\n",
964 BUG_ON(port->tx_bufs[txi].skb->next);
966 port->tx_bufs[txi].skb->next = skb;
967 skb = port->tx_bufs[txi].skb;
968 port->tx_bufs[txi].skb = NULL;
970 ldc_unmap(port->vio.lp,
971 port->tx_bufs[txi].cookies,
972 port->tx_bufs[txi].ncookies);
973 } else if (d->hdr.state == VIO_DESC_FREE)
975 d->hdr.state = VIO_DESC_FREE;
980 static inline void vnet_free_skbs(struct sk_buff *skb)
982 struct sk_buff *next;
992 static void vnet_clean_timer_expire(unsigned long port0)
994 struct vnet_port *port = (struct vnet_port *)port0;
995 struct sk_buff *freeskbs;
998 netif_tx_lock(port->vp->dev);
999 freeskbs = vnet_clean_tx_ring(port, &pending);
1000 netif_tx_unlock(port->vp->dev);
1002 vnet_free_skbs(freeskbs);
1005 (void)mod_timer(&port->clean_timer,
1006 jiffies + VNET_CLEAN_TIMEOUT);
1008 del_timer(&port->clean_timer);
1011 static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
1012 struct ldc_trans_cookie *cookies, int ncookies,
1013 unsigned int map_perm)
1015 int i, nc, err, blen;
1018 blen = skb_headlen(skb);
1019 if (blen < ETH_ZLEN)
1021 blen += VNET_PACKET_SKIP;
1022 blen += 8 - (blen & 7);
1024 err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies,
1025 ncookies, map_perm);
1030 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1031 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1034 if (nc < ncookies) {
1035 vaddr = kmap_atomic(skb_frag_page(f));
1036 blen = skb_frag_size(f);
1037 blen += 8 - (blen & 7);
1038 err = ldc_map_single(lp, vaddr + f->page_offset,
1039 blen, cookies + nc, ncookies - nc,
1041 kunmap_atomic(vaddr);
1047 ldc_unmap(lp, cookies, nc);
1055 static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
1057 struct sk_buff *nskb;
1058 int i, len, pad, docopy;
1062 if (len < ETH_ZLEN) {
1063 pad += ETH_ZLEN - skb->len;
1066 len += VNET_PACKET_SKIP;
1067 pad += 8 - (len & 7);
1069 /* make sure we have enough cookies and alignment in every frag */
1070 docopy = skb_shinfo(skb)->nr_frags >= ncookies;
1071 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1072 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1074 docopy |= f->page_offset & 7;
1076 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
1077 skb_tailroom(skb) < pad ||
1078 skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
1079 int start = 0, offset;
1082 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
1083 nskb = alloc_and_align_skb(skb->dev, len);
1088 skb_reserve(nskb, VNET_PACKET_SKIP);
1090 nskb->protocol = skb->protocol;
1091 offset = skb_mac_header(skb) - skb->data;
1092 skb_set_mac_header(nskb, offset);
1093 offset = skb_network_header(skb) - skb->data;
1094 skb_set_network_header(nskb, offset);
1095 offset = skb_transport_header(skb) - skb->data;
1096 skb_set_transport_header(nskb, offset);
1099 nskb->csum_offset = skb->csum_offset;
1100 nskb->ip_summed = skb->ip_summed;
1102 if (skb->ip_summed == CHECKSUM_PARTIAL)
1103 start = skb_checksum_start_offset(skb);
1105 struct iphdr *iph = ip_hdr(nskb);
1106 int offset = start + nskb->csum_offset;
1108 if (skb_copy_bits(skb, 0, nskb->data, start)) {
1109 dev_kfree_skb(nskb);
1113 *(__sum16 *)(skb->data + offset) = 0;
1114 csum = skb_copy_and_csum_bits(skb, start,
1116 skb->len - start, 0);
1117 if (iph->protocol == IPPROTO_TCP ||
1118 iph->protocol == IPPROTO_UDP) {
1119 csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
1121 iph->protocol, csum);
1123 *(__sum16 *)(nskb->data + offset) = csum;
1125 nskb->ip_summed = CHECKSUM_NONE;
1126 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
1127 dev_kfree_skb(nskb);
1131 (void)skb_put(nskb, skb->len);
1132 if (skb_is_gso(skb)) {
1133 skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
1134 skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
1136 nskb->queue_mapping = skb->queue_mapping;
1144 vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
1145 void *accel_priv, select_queue_fallback_t fallback)
1147 struct vnet *vp = netdev_priv(dev);
1148 struct vnet_port *port = __tx_port_find(vp, skb);
1152 return port->q_index;
1155 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev);
1157 static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
1159 struct net_device *dev = port->vp->dev;
1160 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1161 struct sk_buff *segs;
1162 int maclen, datalen;
1164 int gso_size, gso_type, gso_segs;
1165 int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1166 int proto = IPPROTO_IP;
1168 if (skb->protocol == htons(ETH_P_IP))
1169 proto = ip_hdr(skb)->protocol;
1170 else if (skb->protocol == htons(ETH_P_IPV6))
1171 proto = ipv6_hdr(skb)->nexthdr;
1173 if (proto == IPPROTO_TCP)
1174 hlen += tcp_hdr(skb)->doff * 4;
1175 else if (proto == IPPROTO_UDP)
1176 hlen += sizeof(struct udphdr);
1178 pr_err("vnet_handle_offloads GSO with unknown transport "
1179 "protocol %d tproto %d\n", skb->protocol, proto);
1180 hlen = 128; /* XXX */
1182 datalen = port->tsolen - hlen;
1184 gso_size = skb_shinfo(skb)->gso_size;
1185 gso_type = skb_shinfo(skb)->gso_type;
1186 gso_segs = skb_shinfo(skb)->gso_segs;
1188 if (port->tso && gso_size < datalen)
1189 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1191 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1192 struct netdev_queue *txq;
1194 txq = netdev_get_tx_queue(dev, port->q_index);
1195 netif_tx_stop_queue(txq);
1196 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1197 return NETDEV_TX_BUSY;
1198 netif_tx_wake_queue(txq);
1201 maclen = skb_network_header(skb) - skb_mac_header(skb);
1202 skb_pull(skb, maclen);
1204 if (port->tso && gso_size < datalen) {
1205 if (skb_unclone(skb, GFP_ATOMIC))
1208 /* segment to TSO size */
1209 skb_shinfo(skb)->gso_size = datalen;
1210 skb_shinfo(skb)->gso_segs = gso_segs;
1212 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1216 skb_push(skb, maclen);
1217 skb_reset_mac_header(skb);
1221 struct sk_buff *curr = segs;
1225 if (port->tso && curr->len > dev->mtu) {
1226 skb_shinfo(curr)->gso_size = gso_size;
1227 skb_shinfo(curr)->gso_type = gso_type;
1228 skb_shinfo(curr)->gso_segs =
1229 DIV_ROUND_UP(curr->len - hlen, gso_size);
1231 skb_shinfo(curr)->gso_size = 0;
1233 skb_push(curr, maclen);
1234 skb_reset_mac_header(curr);
1235 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1237 curr->csum_start = skb_transport_header(curr) - curr->head;
1238 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1239 curr->csum_offset = offsetof(struct tcphdr, check);
1240 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1241 curr->csum_offset = offsetof(struct udphdr, check);
1243 if (!(status & NETDEV_TX_MASK))
1244 status = vnet_start_xmit(curr, dev);
1245 if (status & NETDEV_TX_MASK)
1246 dev_kfree_skb_any(curr);
1249 if (!(status & NETDEV_TX_MASK))
1250 dev_kfree_skb_any(skb);
1253 dev->stats.tx_dropped++;
1254 dev_kfree_skb_any(skb);
1255 return NETDEV_TX_OK;
1258 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
1260 struct vnet *vp = netdev_priv(dev);
1261 struct vnet_port *port = NULL;
1262 struct vio_dring_state *dr;
1263 struct vio_net_desc *d;
1265 struct sk_buff *freeskbs = NULL;
1267 unsigned pending = 0;
1268 struct netdev_queue *txq;
1271 port = __tx_port_find(vp, skb);
1272 if (unlikely(!port)) {
1277 if (skb_is_gso(skb) && skb->len > port->tsolen) {
1278 err = vnet_handle_offloads(port, skb);
1283 if (!skb_is_gso(skb) && skb->len > port->rmtu) {
1284 unsigned long localmtu = port->rmtu - ETH_HLEN;
1286 if (vio_version_after_eq(&port->vio, 1, 3))
1287 localmtu -= VLAN_HLEN;
1289 if (skb->protocol == htons(ETH_P_IP)) {
1291 struct rtable *rt = NULL;
1293 memset(&fl4, 0, sizeof(fl4));
1294 fl4.flowi4_oif = dev->ifindex;
1295 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
1296 fl4.daddr = ip_hdr(skb)->daddr;
1297 fl4.saddr = ip_hdr(skb)->saddr;
1299 rt = ip_route_output_key(dev_net(dev), &fl4);
1302 skb_dst_set(skb, &rt->dst);
1303 icmp_send(skb, ICMP_DEST_UNREACH,
1308 #if IS_ENABLED(CONFIG_IPV6)
1309 else if (skb->protocol == htons(ETH_P_IPV6))
1310 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1315 skb = vnet_skb_shape(skb, 2);
1320 if (skb->ip_summed == CHECKSUM_PARTIAL)
1323 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1324 i = skb_get_queue_mapping(skb);
1325 txq = netdev_get_tx_queue(dev, i);
1326 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1327 if (!netif_tx_queue_stopped(txq)) {
1328 netif_tx_stop_queue(txq);
1330 /* This is a hard error, log it. */
1331 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1332 dev->stats.tx_errors++;
1335 return NETDEV_TX_BUSY;
1338 d = vio_dring_cur(dr);
1342 freeskbs = vnet_clean_tx_ring(port, &pending);
1344 BUG_ON(port->tx_bufs[txi].skb);
1350 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1351 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1353 netdev_info(dev, "tx buffer map error %d\n", err);
1357 port->tx_bufs[txi].skb = skb;
1359 port->tx_bufs[txi].ncookies = err;
1361 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1362 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1363 * the protocol itself does not require it as long as the peer
1364 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1366 * An ACK for every packet in the ring is expensive as the
1367 * sending of LDC messages is slow and affects performance.
1369 d->hdr.ack = VIO_ACK_DISABLE;
1371 d->ncookies = port->tx_bufs[txi].ncookies;
1372 for (i = 0; i < d->ncookies; i++)
1373 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1374 if (vio_version_after_eq(&port->vio, 1, 7)) {
1375 struct vio_net_dext *dext = vio_net_ext(d);
1377 memset(dext, 0, sizeof(*dext));
1378 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1379 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1381 dext->flags |= VNET_PKT_IPV4_LSO;
1383 if (vio_version_after_eq(&port->vio, 1, 8) &&
1384 !port->switch_port) {
1385 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1386 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1390 /* This has to be a non-SMP write barrier because we are writing
1391 * to memory which is shared with the peer LDOM.
1395 d->hdr.state = VIO_DESC_READY;
1397 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1398 * to notify the consumer that some descriptors are READY.
1399 * After that "start" trigger, no additional triggers are needed until
1400 * a DRING_STOPPED is received from the consumer. The dr->cons field
1401 * (set up by vnet_ack()) has the value of the next dring index
1402 * that has not yet been ack-ed. We send a "start" trigger here
1403 * if, and only if, start_cons is true (reset it afterward). Conversely,
1404 * vnet_ack() should check if the dring corresponding to cons
1405 * is marked READY, but start_cons was false.
1406 * If so, vnet_ack() should send out the missed "start" trigger.
1408 * Note that the dma_wmb() above makes sure the cookies et al. are
1409 * not globally visible before the VIO_DESC_READY, and that the
1410 * stores are ordered correctly by the compiler. The consumer will
1411 * not proceed until the VIO_DESC_READY is visible assuring that
1412 * the consumer does not observe anything related to descriptors
1413 * out of order. The HV trap from the LDC start trigger is the
1414 * producer to consumer announcement that work is available to the
1417 if (!port->start_cons)
1418 goto ldc_start_done; /* previous trigger suffices */
1420 err = __vnet_tx_trigger(port, dr->cons);
1421 if (unlikely(err < 0)) {
1422 netdev_info(dev, "TX trigger error %d\n", err);
1423 d->hdr.state = VIO_DESC_FREE;
1424 skb = port->tx_bufs[txi].skb;
1425 port->tx_bufs[txi].skb = NULL;
1426 dev->stats.tx_carrier_errors++;
1431 port->start_cons = false;
1433 dev->stats.tx_packets++;
1434 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1436 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1437 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1438 netif_tx_stop_queue(txq);
1439 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1440 netif_tx_wake_queue(txq);
1443 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1446 vnet_free_skbs(freeskbs);
1448 return NETDEV_TX_OK;
1452 (void)mod_timer(&port->clean_timer,
1453 jiffies + VNET_CLEAN_TIMEOUT);
1455 del_timer(&port->clean_timer);
1460 vnet_free_skbs(freeskbs);
1461 dev->stats.tx_dropped++;
1462 return NETDEV_TX_OK;
1465 static void vnet_tx_timeout(struct net_device *dev)
1467 /* XXX Implement me XXX */
1470 static int vnet_open(struct net_device *dev)
1472 netif_carrier_on(dev);
1473 netif_tx_start_all_queues(dev);
1478 static int vnet_close(struct net_device *dev)
1480 netif_tx_stop_all_queues(dev);
1481 netif_carrier_off(dev);
1486 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1488 struct vnet_mcast_entry *m;
1490 for (m = vp->mcast_list; m; m = m->next) {
1491 if (ether_addr_equal(m->addr, addr))
1497 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1499 struct netdev_hw_addr *ha;
1501 netdev_for_each_mc_addr(ha, dev) {
1502 struct vnet_mcast_entry *m;
1504 m = __vnet_mc_find(vp, ha->addr);
1511 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1514 memcpy(m->addr, ha->addr, ETH_ALEN);
1517 m->next = vp->mcast_list;
1523 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1525 struct vio_net_mcast_info info;
1526 struct vnet_mcast_entry *m, **pp;
1529 memset(&info, 0, sizeof(info));
1531 info.tag.type = VIO_TYPE_CTRL;
1532 info.tag.stype = VIO_SUBTYPE_INFO;
1533 info.tag.stype_env = VNET_MCAST_INFO;
1534 info.tag.sid = vio_send_sid(&port->vio);
1538 for (m = vp->mcast_list; m; m = m->next) {
1542 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1544 if (++n_addrs == VNET_NUM_MCAST) {
1545 info.count = n_addrs;
1547 (void) vio_ldc_send(&port->vio, &info,
1553 info.count = n_addrs;
1554 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1560 pp = &vp->mcast_list;
1561 while ((m = *pp) != NULL) {
1568 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1570 if (++n_addrs == VNET_NUM_MCAST) {
1571 info.count = n_addrs;
1572 (void) vio_ldc_send(&port->vio, &info,
1581 info.count = n_addrs;
1582 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1586 static void vnet_set_rx_mode(struct net_device *dev)
1588 struct vnet *vp = netdev_priv(dev);
1589 struct vnet_port *port;
1592 list_for_each_entry_rcu(port, &vp->port_list, list) {
1594 if (port->switch_port) {
1595 __update_mc_list(vp, dev);
1596 __send_mc_list(vp, port);
1603 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
1605 if (new_mtu < 68 || new_mtu > 65535)
1612 static int vnet_set_mac_addr(struct net_device *dev, void *p)
1617 static void vnet_get_drvinfo(struct net_device *dev,
1618 struct ethtool_drvinfo *info)
1620 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
1621 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
1624 static u32 vnet_get_msglevel(struct net_device *dev)
1626 struct vnet *vp = netdev_priv(dev);
1627 return vp->msg_enable;
1630 static void vnet_set_msglevel(struct net_device *dev, u32 value)
1632 struct vnet *vp = netdev_priv(dev);
1633 vp->msg_enable = value;
1636 static const struct ethtool_ops vnet_ethtool_ops = {
1637 .get_drvinfo = vnet_get_drvinfo,
1638 .get_msglevel = vnet_get_msglevel,
1639 .set_msglevel = vnet_set_msglevel,
1640 .get_link = ethtool_op_get_link,
1643 static void vnet_port_free_tx_bufs(struct vnet_port *port)
1645 struct vio_dring_state *dr;
1648 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1650 if (dr->base == NULL)
1653 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1654 struct vio_net_desc *d;
1655 void *skb = port->tx_bufs[i].skb;
1660 d = vio_dring_entry(dr, i);
1662 ldc_unmap(port->vio.lp,
1663 port->tx_bufs[i].cookies,
1664 port->tx_bufs[i].ncookies);
1666 port->tx_bufs[i].skb = NULL;
1667 d->hdr.state = VIO_DESC_FREE;
1669 ldc_free_exp_dring(port->vio.lp, dr->base,
1670 (dr->entry_size * dr->num_entries),
1671 dr->cookies, dr->ncookies);
1674 dr->num_entries = 0;
1679 static void vnet_port_reset(struct vnet_port *port)
1681 del_timer(&port->clean_timer);
1682 vnet_port_free_tx_bufs(port);
1688 static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1690 struct vio_dring_state *dr;
1691 unsigned long len, elen;
1692 int i, err, ncookies;
1695 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1697 elen = sizeof(struct vio_net_desc) +
1698 sizeof(struct ldc_trans_cookie) * 2;
1699 if (vio_version_after_eq(&port->vio, 1, 7))
1700 elen += sizeof(struct vio_net_dext);
1701 len = VNET_TX_RING_SIZE * elen;
1703 ncookies = VIO_MAX_RING_COOKIES;
1704 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1705 dr->cookies, &ncookies,
1709 if (IS_ERR(dring)) {
1710 err = PTR_ERR(dring);
1715 dr->entry_size = elen;
1716 dr->num_entries = VNET_TX_RING_SIZE;
1717 dr->prod = dr->cons = 0;
1718 port->start_cons = true; /* need an initial trigger */
1719 dr->pending = VNET_TX_RING_SIZE;
1720 dr->ncookies = ncookies;
1722 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1723 struct vio_net_desc *d;
1725 d = vio_dring_entry(dr, i);
1726 d->hdr.state = VIO_DESC_FREE;
1731 vnet_port_free_tx_bufs(port);
1736 #ifdef CONFIG_NET_POLL_CONTROLLER
1737 static void vnet_poll_controller(struct net_device *dev)
1739 struct vnet *vp = netdev_priv(dev);
1740 struct vnet_port *port;
1741 unsigned long flags;
1743 spin_lock_irqsave(&vp->lock, flags);
1744 if (!list_empty(&vp->port_list)) {
1745 port = list_entry(vp->port_list.next, struct vnet_port, list);
1746 napi_schedule(&port->napi);
1748 spin_unlock_irqrestore(&vp->lock, flags);
1751 static LIST_HEAD(vnet_list);
1752 static DEFINE_MUTEX(vnet_list_mutex);
1754 static const struct net_device_ops vnet_ops = {
1755 .ndo_open = vnet_open,
1756 .ndo_stop = vnet_close,
1757 .ndo_set_rx_mode = vnet_set_rx_mode,
1758 .ndo_set_mac_address = vnet_set_mac_addr,
1759 .ndo_validate_addr = eth_validate_addr,
1760 .ndo_tx_timeout = vnet_tx_timeout,
1761 .ndo_change_mtu = vnet_change_mtu,
1762 .ndo_start_xmit = vnet_start_xmit,
1763 .ndo_select_queue = vnet_select_queue,
1764 #ifdef CONFIG_NET_POLL_CONTROLLER
1765 .ndo_poll_controller = vnet_poll_controller,
1769 static struct vnet *vnet_new(const u64 *local_mac,
1770 struct vio_dev *vdev)
1772 struct net_device *dev;
1776 dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
1778 return ERR_PTR(-ENOMEM);
1779 dev->needed_headroom = VNET_PACKET_SKIP + 8;
1780 dev->needed_tailroom = 8;
1782 for (i = 0; i < ETH_ALEN; i++)
1783 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1785 vp = netdev_priv(dev);
1787 spin_lock_init(&vp->lock);
1790 INIT_LIST_HEAD(&vp->port_list);
1791 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1792 INIT_HLIST_HEAD(&vp->port_hash[i]);
1793 INIT_LIST_HEAD(&vp->list);
1794 vp->local_mac = *local_mac;
1796 dev->netdev_ops = &vnet_ops;
1797 dev->ethtool_ops = &vnet_ethtool_ops;
1798 dev->watchdog_timeo = VNET_TX_TIMEOUT;
1800 dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
1801 NETIF_F_HW_CSUM | NETIF_F_SG;
1802 dev->features = dev->hw_features;
1804 SET_NETDEV_DEV(dev, &vdev->dev);
1806 err = register_netdev(dev);
1808 pr_err("Cannot register net device, aborting\n");
1809 goto err_out_free_dev;
1812 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
1814 list_add(&vp->list, &vnet_list);
1821 return ERR_PTR(err);
1824 static struct vnet *vnet_find_or_create(const u64 *local_mac,
1825 struct vio_dev *vdev)
1827 struct vnet *iter, *vp;
1829 mutex_lock(&vnet_list_mutex);
1831 list_for_each_entry(iter, &vnet_list, list) {
1832 if (iter->local_mac == *local_mac) {
1838 vp = vnet_new(local_mac, vdev);
1839 mutex_unlock(&vnet_list_mutex);
1844 static void vnet_cleanup(void)
1847 struct net_device *dev;
1849 mutex_lock(&vnet_list_mutex);
1850 while (!list_empty(&vnet_list)) {
1851 vp = list_first_entry(&vnet_list, struct vnet, list);
1852 list_del(&vp->list);
1854 /* vio_unregister_driver() should have cleaned up port_list */
1855 BUG_ON(!list_empty(&vp->port_list));
1856 unregister_netdev(dev);
1859 mutex_unlock(&vnet_list_mutex);
1862 static const char *local_mac_prop = "local-mac-address";
1864 static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
1866 struct vio_dev *vdev)
1868 const u64 *local_mac = NULL;
1871 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1872 u64 target = mdesc_arc_target(hp, a);
1875 name = mdesc_get_property(hp, target, "name", NULL);
1876 if (!name || strcmp(name, "network"))
1879 local_mac = mdesc_get_property(hp, target,
1880 local_mac_prop, NULL);
1885 return ERR_PTR(-ENODEV);
1887 return vnet_find_or_create(local_mac, vdev);
1890 static struct ldc_channel_config vnet_ldc_cfg = {
1891 .event = vnet_event,
1893 .mode = LDC_MODE_UNRELIABLE,
1896 static struct vio_driver_ops vnet_vio_ops = {
1897 .send_attr = vnet_send_attr,
1898 .handle_attr = vnet_handle_attr,
1899 .handshake_complete = vnet_handshake_complete,
1902 static void print_version(void)
1904 printk_once(KERN_INFO "%s", version);
1907 const char *remote_macaddr_prop = "remote-mac-address";
1910 vnet_port_add_txq(struct vnet_port *port)
1912 struct vnet *vp = port->vp;
1916 n = n & (VNET_MAX_TXQS - 1);
1918 netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index));
1922 vnet_port_rm_txq(struct vnet_port *port)
1925 netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
1928 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1930 struct mdesc_handle *hp;
1931 struct vnet_port *port;
1932 unsigned long flags;
1935 int len, i, err, switch_port;
1941 vp = vnet_find_parent(hp, vdev->mp, vdev);
1943 pr_err("Cannot find port parent vnet\n");
1945 goto err_out_put_mdesc;
1948 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1951 pr_err("Port lacks %s property\n", remote_macaddr_prop);
1952 goto err_out_put_mdesc;
1955 port = kzalloc(sizeof(*port), GFP_KERNEL);
1958 goto err_out_put_mdesc;
1960 for (i = 0; i < ETH_ALEN; i++)
1961 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1965 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1966 vnet_versions, ARRAY_SIZE(vnet_versions),
1967 &vnet_vio_ops, vp->dev->name);
1969 goto err_out_free_port;
1971 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1973 goto err_out_free_port;
1975 netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT);
1977 INIT_HLIST_NODE(&port->hash);
1978 INIT_LIST_HEAD(&port->list);
1981 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1983 port->switch_port = switch_port;
1987 spin_lock_irqsave(&vp->lock, flags);
1989 list_add_rcu(&port->list, &vp->port_list);
1991 list_add_tail_rcu(&port->list, &vp->port_list);
1992 hlist_add_head_rcu(&port->hash,
1993 &vp->port_hash[vnet_hashfn(port->raddr)]);
1994 vnet_port_add_txq(port);
1995 spin_unlock_irqrestore(&vp->lock, flags);
1997 dev_set_drvdata(&vdev->dev, port);
1999 pr_info("%s: PORT ( remote-mac %pM%s )\n",
2000 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
2002 setup_timer(&port->clean_timer, vnet_clean_timer_expire,
2003 (unsigned long)port);
2005 napi_enable(&port->napi);
2006 vio_port_up(&port->vio);
2020 static int vnet_port_remove(struct vio_dev *vdev)
2022 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
2026 del_timer_sync(&port->vio.timer);
2028 napi_disable(&port->napi);
2030 list_del_rcu(&port->list);
2031 hlist_del_rcu(&port->hash);
2034 del_timer_sync(&port->clean_timer);
2035 vnet_port_rm_txq(port);
2036 netif_napi_del(&port->napi);
2037 vnet_port_free_tx_bufs(port);
2038 vio_ldc_free(&port->vio);
2040 dev_set_drvdata(&vdev->dev, NULL);
2048 static const struct vio_device_id vnet_port_match[] = {
2050 .type = "vnet-port",
2054 MODULE_DEVICE_TABLE(vio, vnet_port_match);
2056 static struct vio_driver vnet_port_driver = {
2057 .id_table = vnet_port_match,
2058 .probe = vnet_port_probe,
2059 .remove = vnet_port_remove,
2060 .name = "vnet_port",
2063 static int __init vnet_init(void)
2065 return vio_register_driver(&vnet_port_driver);
2068 static void __exit vnet_exit(void)
2070 vio_unregister_driver(&vnet_port_driver);
2074 module_init(vnet_init);
2075 module_exit(vnet_exit);