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/if_vlan.h>
20 #if IS_ENABLED(CONFIG_IPV6)
21 #include <linux/icmpv6.h>
25 #include <net/route.h>
32 #define DRV_MODULE_NAME "sunvnet"
33 #define DRV_MODULE_VERSION "1.0"
34 #define DRV_MODULE_RELDATE "June 25, 2007"
36 static char version
[] =
37 DRV_MODULE_NAME
".c:v" DRV_MODULE_VERSION
" (" DRV_MODULE_RELDATE
")\n";
38 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
39 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
40 MODULE_LICENSE("GPL");
41 MODULE_VERSION(DRV_MODULE_VERSION
);
43 /* Heuristic for the number of times to exponentially backoff and
44 * retry sending an LDC trigger when EAGAIN is encountered
46 #define VNET_MAX_RETRIES 10
48 static int __vnet_tx_trigger(struct vnet_port
*port
, u32 start
);
50 /* Ordered from largest major to lowest */
51 static struct vio_version vnet_versions
[] = {
52 { .major
= 1, .minor
= 6 },
53 { .major
= 1, .minor
= 0 },
56 static inline u32
vnet_tx_dring_avail(struct vio_dring_state
*dr
)
58 return vio_dring_avail(dr
, VNET_TX_RING_SIZE
);
61 static int vnet_handle_unknown(struct vnet_port
*port
, void *arg
)
63 struct vio_msg_tag
*pkt
= arg
;
65 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
66 pkt
->type
, pkt
->stype
, pkt
->stype_env
, pkt
->sid
);
67 pr_err("Resetting connection\n");
69 ldc_disconnect(port
->vio
.lp
);
74 static int vnet_send_attr(struct vio_driver_state
*vio
)
76 struct vnet_port
*port
= to_vnet_port(vio
);
77 struct net_device
*dev
= port
->vp
->dev
;
78 struct vio_net_attr_info pkt
;
79 int framelen
= ETH_FRAME_LEN
;
82 memset(&pkt
, 0, sizeof(pkt
));
83 pkt
.tag
.type
= VIO_TYPE_CTRL
;
84 pkt
.tag
.stype
= VIO_SUBTYPE_INFO
;
85 pkt
.tag
.stype_env
= VIO_ATTR_INFO
;
86 pkt
.tag
.sid
= vio_send_sid(vio
);
87 if (vio_version_before(vio
, 1, 2))
88 pkt
.xfer_mode
= VIO_DRING_MODE
;
90 pkt
.xfer_mode
= VIO_NEW_DRING_MODE
;
91 pkt
.addr_type
= VNET_ADDR_ETHERMAC
;
93 for (i
= 0; i
< 6; i
++)
94 pkt
.addr
|= (u64
)dev
->dev_addr
[i
] << ((5 - i
) * 8);
95 if (vio_version_after(vio
, 1, 3)) {
97 port
->rmtu
= min(VNET_MAXPACKET
, port
->rmtu
);
100 port
->rmtu
= VNET_MAXPACKET
;
101 pkt
.mtu
= port
->rmtu
;
103 if (vio_version_after_eq(vio
, 1, 6))
104 pkt
.options
= VIO_TX_DRING
;
105 } else if (vio_version_before(vio
, 1, 3)) {
108 pkt
.mtu
= framelen
+ VLAN_HLEN
;
111 pkt
.plnk_updt
= PHYSLINK_UPDATE_NONE
;
114 viodbg(HS
, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
115 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
116 "cflags[0x%04x] lso_max[%u]\n",
117 pkt
.xfer_mode
, pkt
.addr_type
,
118 (unsigned long long)pkt
.addr
,
119 pkt
.ack_freq
, pkt
.plnk_updt
, pkt
.options
,
120 (unsigned long long)pkt
.mtu
, pkt
.cflags
, pkt
.ipv4_lso_maxlen
);
123 return vio_ldc_send(vio
, &pkt
, sizeof(pkt
));
126 static int handle_attr_info(struct vio_driver_state
*vio
,
127 struct vio_net_attr_info
*pkt
)
129 struct vnet_port
*port
= to_vnet_port(vio
);
133 viodbg(HS
, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
134 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
135 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
136 pkt
->xfer_mode
, pkt
->addr_type
,
137 (unsigned long long)pkt
->addr
,
138 pkt
->ack_freq
, pkt
->plnk_updt
, pkt
->options
,
139 (unsigned long long)pkt
->mtu
, port
->rmtu
, pkt
->cflags
,
140 pkt
->ipv4_lso_maxlen
);
142 pkt
->tag
.sid
= vio_send_sid(vio
);
144 xfer_mode
= pkt
->xfer_mode
;
145 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
146 if (vio_version_before(vio
, 1, 2) && xfer_mode
== VIO_DRING_MODE
)
147 xfer_mode
= VIO_NEW_DRING_MODE
;
150 * < v1.3 - ETH_FRAME_LEN exactly
151 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
153 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
155 if (vio_version_before(vio
, 1, 3)) {
156 localmtu
= ETH_FRAME_LEN
;
157 } else if (vio_version_after(vio
, 1, 3)) {
158 localmtu
= port
->rmtu
? port
->rmtu
: VNET_MAXPACKET
;
159 localmtu
= min(pkt
->mtu
, localmtu
);
162 localmtu
= ETH_FRAME_LEN
+ VLAN_HLEN
;
164 port
->rmtu
= localmtu
;
166 /* for version >= 1.6, ACK packet mode we support */
167 if (vio_version_after_eq(vio
, 1, 6)) {
168 pkt
->xfer_mode
= VIO_NEW_DRING_MODE
;
169 pkt
->options
= VIO_TX_DRING
;
172 if (!(xfer_mode
| VIO_NEW_DRING_MODE
) ||
173 pkt
->addr_type
!= VNET_ADDR_ETHERMAC
||
174 pkt
->mtu
!= localmtu
) {
175 viodbg(HS
, "SEND NET ATTR NACK\n");
177 pkt
->tag
.stype
= VIO_SUBTYPE_NACK
;
179 (void) vio_ldc_send(vio
, pkt
, sizeof(*pkt
));
183 viodbg(HS
, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
184 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
185 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
186 pkt
->xfer_mode
, pkt
->addr_type
,
187 (unsigned long long)pkt
->addr
,
188 pkt
->ack_freq
, pkt
->plnk_updt
, pkt
->options
,
189 (unsigned long long)pkt
->mtu
, port
->rmtu
, pkt
->cflags
,
190 pkt
->ipv4_lso_maxlen
);
192 pkt
->tag
.stype
= VIO_SUBTYPE_ACK
;
194 return vio_ldc_send(vio
, pkt
, sizeof(*pkt
));
199 static int handle_attr_ack(struct vio_driver_state
*vio
,
200 struct vio_net_attr_info
*pkt
)
202 viodbg(HS
, "GOT NET ATTR ACK\n");
207 static int handle_attr_nack(struct vio_driver_state
*vio
,
208 struct vio_net_attr_info
*pkt
)
210 viodbg(HS
, "GOT NET ATTR NACK\n");
215 static int vnet_handle_attr(struct vio_driver_state
*vio
, void *arg
)
217 struct vio_net_attr_info
*pkt
= arg
;
219 switch (pkt
->tag
.stype
) {
220 case VIO_SUBTYPE_INFO
:
221 return handle_attr_info(vio
, pkt
);
223 case VIO_SUBTYPE_ACK
:
224 return handle_attr_ack(vio
, pkt
);
226 case VIO_SUBTYPE_NACK
:
227 return handle_attr_nack(vio
, pkt
);
234 static void vnet_handshake_complete(struct vio_driver_state
*vio
)
236 struct vio_dring_state
*dr
;
238 dr
= &vio
->drings
[VIO_DRIVER_RX_RING
];
239 dr
->snd_nxt
= dr
->rcv_nxt
= 1;
241 dr
= &vio
->drings
[VIO_DRIVER_TX_RING
];
242 dr
->snd_nxt
= dr
->rcv_nxt
= 1;
245 /* The hypervisor interface that implements copying to/from imported
246 * memory from another domain requires that copies are done to 8-byte
247 * aligned buffers, and that the lengths of such copies are also 8-byte
250 * So we align skb->data to an 8-byte multiple and pad-out the data
251 * area so we can round the copy length up to the next multiple of
254 * The transmitter puts the actual start of the packet 6 bytes into
255 * the buffer it sends over, so that the IP headers after the ethernet
256 * header are aligned properly. These 6 bytes are not in the descriptor
257 * length, they are simply implied. This offset is represented using
258 * the VNET_PACKET_SKIP macro.
260 static struct sk_buff
*alloc_and_align_skb(struct net_device
*dev
,
263 struct sk_buff
*skb
= netdev_alloc_skb(dev
, len
+VNET_PACKET_SKIP
+8+8);
264 unsigned long addr
, off
;
269 addr
= (unsigned long) skb
->data
;
270 off
= ((addr
+ 7UL) & ~7UL) - addr
;
272 skb_reserve(skb
, off
);
277 static int vnet_rx_one(struct vnet_port
*port
, unsigned int len
,
278 struct ldc_trans_cookie
*cookies
, int ncookies
)
280 struct net_device
*dev
= port
->vp
->dev
;
281 unsigned int copy_len
;
286 if (unlikely(len
< ETH_ZLEN
|| len
> port
->rmtu
)) {
287 dev
->stats
.rx_length_errors
++;
291 skb
= alloc_and_align_skb(dev
, len
);
293 if (unlikely(!skb
)) {
294 dev
->stats
.rx_missed_errors
++;
298 copy_len
= (len
+ VNET_PACKET_SKIP
+ 7U) & ~7U;
299 skb_put(skb
, copy_len
);
300 err
= ldc_copy(port
->vio
.lp
, LDC_COPY_IN
,
301 skb
->data
, copy_len
, 0,
303 if (unlikely(err
< 0)) {
304 dev
->stats
.rx_frame_errors
++;
308 skb_pull(skb
, VNET_PACKET_SKIP
);
310 skb
->protocol
= eth_type_trans(skb
, dev
);
312 dev
->stats
.rx_packets
++;
313 dev
->stats
.rx_bytes
+= len
;
314 napi_gro_receive(&port
->napi
, skb
);
321 dev
->stats
.rx_dropped
++;
325 static int vnet_send_ack(struct vnet_port
*port
, struct vio_dring_state
*dr
,
326 u32 start
, u32 end
, u8 vio_dring_state
)
328 struct vio_dring_data hdr
= {
330 .type
= VIO_TYPE_DATA
,
331 .stype
= VIO_SUBTYPE_ACK
,
332 .stype_env
= VIO_DRING_DATA
,
333 .sid
= vio_send_sid(&port
->vio
),
335 .dring_ident
= dr
->ident
,
338 .state
= vio_dring_state
,
343 hdr
.seq
= dr
->snd_nxt
;
346 err
= vio_ldc_send(&port
->vio
, &hdr
, sizeof(hdr
));
352 if ((delay
<<= 1) > 128)
354 if (retries
++ > VNET_MAX_RETRIES
) {
355 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
356 port
->raddr
[0], port
->raddr
[1],
357 port
->raddr
[2], port
->raddr
[3],
358 port
->raddr
[4], port
->raddr
[5]);
361 } while (err
== -EAGAIN
);
363 if (err
<= 0 && vio_dring_state
== VIO_DRING_STOPPED
) {
364 port
->stop_rx_idx
= end
;
365 port
->stop_rx
= true;
367 port
->stop_rx_idx
= 0;
368 port
->stop_rx
= false;
374 static u32
next_idx(u32 idx
, struct vio_dring_state
*dr
)
376 if (++idx
== dr
->num_entries
)
381 static u32
prev_idx(u32 idx
, struct vio_dring_state
*dr
)
384 idx
= dr
->num_entries
- 1;
391 static struct vio_net_desc
*get_rx_desc(struct vnet_port
*port
,
392 struct vio_dring_state
*dr
,
395 struct vio_net_desc
*desc
= port
->vio
.desc_buf
;
398 err
= ldc_get_dring_entry(port
->vio
.lp
, desc
, dr
->entry_size
,
399 (index
* dr
->entry_size
),
400 dr
->cookies
, dr
->ncookies
);
407 static int put_rx_desc(struct vnet_port
*port
,
408 struct vio_dring_state
*dr
,
409 struct vio_net_desc
*desc
,
414 err
= ldc_put_dring_entry(port
->vio
.lp
, desc
, dr
->entry_size
,
415 (index
* dr
->entry_size
),
416 dr
->cookies
, dr
->ncookies
);
423 static int vnet_walk_rx_one(struct vnet_port
*port
,
424 struct vio_dring_state
*dr
,
425 u32 index
, int *needs_ack
)
427 struct vio_net_desc
*desc
= get_rx_desc(port
, dr
, index
);
428 struct vio_driver_state
*vio
= &port
->vio
;
431 BUG_ON(desc
== NULL
);
433 return PTR_ERR(desc
);
435 if (desc
->hdr
.state
!= VIO_DESC_READY
)
440 viodbg(DATA
, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
441 desc
->hdr
.state
, desc
->hdr
.ack
,
442 desc
->size
, desc
->ncookies
,
443 desc
->cookies
[0].cookie_addr
,
444 desc
->cookies
[0].cookie_size
);
446 err
= vnet_rx_one(port
, desc
->size
, desc
->cookies
, desc
->ncookies
);
447 if (err
== -ECONNRESET
)
449 desc
->hdr
.state
= VIO_DESC_DONE
;
450 err
= put_rx_desc(port
, dr
, desc
, index
);
453 *needs_ack
= desc
->hdr
.ack
;
457 static int vnet_walk_rx(struct vnet_port
*port
, struct vio_dring_state
*dr
,
458 u32 start
, u32 end
, int *npkts
, int budget
)
460 struct vio_driver_state
*vio
= &port
->vio
;
461 int ack_start
= -1, ack_end
= -1;
462 bool send_ack
= true;
464 end
= (end
== (u32
) -1) ? prev_idx(start
, dr
) : next_idx(end
, dr
);
466 viodbg(DATA
, "vnet_walk_rx start[%08x] end[%08x]\n", start
, end
);
468 while (start
!= end
) {
469 int ack
= 0, err
= vnet_walk_rx_one(port
, dr
, start
, &ack
);
470 if (err
== -ECONNRESET
)
478 start
= next_idx(start
, dr
);
479 if (ack
&& start
!= end
) {
480 err
= vnet_send_ack(port
, dr
, ack_start
, ack_end
,
482 if (err
== -ECONNRESET
)
486 if ((*npkts
) >= budget
) {
491 if (unlikely(ack_start
== -1))
492 ack_start
= ack_end
= prev_idx(start
, dr
);
494 port
->napi_resume
= false;
495 return vnet_send_ack(port
, dr
, ack_start
, ack_end
,
498 port
->napi_resume
= true;
499 port
->napi_stop_idx
= ack_end
;
504 static int vnet_rx(struct vnet_port
*port
, void *msgbuf
, int *npkts
,
507 struct vio_dring_data
*pkt
= msgbuf
;
508 struct vio_dring_state
*dr
= &port
->vio
.drings
[VIO_DRIVER_RX_RING
];
509 struct vio_driver_state
*vio
= &port
->vio
;
511 viodbg(DATA
, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
512 pkt
->tag
.stype_env
, pkt
->seq
, dr
->rcv_nxt
);
514 if (unlikely(pkt
->tag
.stype_env
!= VIO_DRING_DATA
))
516 if (unlikely(pkt
->seq
!= dr
->rcv_nxt
)) {
517 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
518 pkt
->seq
, dr
->rcv_nxt
);
522 if (!port
->napi_resume
)
525 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
527 return vnet_walk_rx(port
, dr
, pkt
->start_idx
, pkt
->end_idx
,
531 static int idx_is_pending(struct vio_dring_state
*dr
, u32 end
)
536 while (idx
!= dr
->prod
) {
541 idx
= next_idx(idx
, dr
);
546 static int vnet_ack(struct vnet_port
*port
, void *msgbuf
)
548 struct vio_dring_state
*dr
= &port
->vio
.drings
[VIO_DRIVER_TX_RING
];
549 struct vio_dring_data
*pkt
= msgbuf
;
550 struct net_device
*dev
;
553 struct vio_net_desc
*desc
;
554 if (unlikely(pkt
->tag
.stype_env
!= VIO_DRING_DATA
))
558 if (unlikely(!idx_is_pending(dr
, end
)))
563 /* sync for race conditions with vnet_start_xmit() and tell xmit it
564 * is time to send a trigger.
567 dr
->cons
= next_idx(end
, dr
);
568 desc
= vio_dring_entry(dr
, dr
->cons
);
569 if (desc
->hdr
.state
== VIO_DESC_READY
&& port
->start_cons
) {
570 /* vnet_start_xmit() just populated this dring but missed
571 * sending the "start" LDC message to the consumer.
572 * Send a "start" trigger on its behalf.
574 if (__vnet_tx_trigger(port
, dr
->cons
) > 0)
575 port
->start_cons
= false;
577 port
->start_cons
= true;
579 port
->start_cons
= true;
581 netif_tx_unlock(dev
);
583 if (unlikely(netif_queue_stopped(dev
) &&
584 vnet_tx_dring_avail(dr
) >= VNET_TX_WAKEUP_THRESH(dr
)))
590 static int vnet_nack(struct vnet_port
*port
, void *msgbuf
)
592 /* XXX just reset or similar XXX */
596 static int handle_mcast(struct vnet_port
*port
, void *msgbuf
)
598 struct vio_net_mcast_info
*pkt
= msgbuf
;
600 if (pkt
->tag
.stype
!= VIO_SUBTYPE_ACK
)
601 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
611 static void maybe_tx_wakeup(struct vnet
*vp
)
613 struct net_device
*dev
= vp
->dev
;
616 if (likely(netif_queue_stopped(dev
))) {
617 struct vnet_port
*port
;
621 list_for_each_entry_rcu(port
, &vp
->port_list
, list
) {
622 struct vio_dring_state
*dr
;
624 dr
= &port
->vio
.drings
[VIO_DRIVER_TX_RING
];
625 if (vnet_tx_dring_avail(dr
) <
626 VNET_TX_WAKEUP_THRESH(dr
)) {
633 netif_wake_queue(dev
);
635 netif_tx_unlock(dev
);
638 static inline bool port_is_up(struct vnet_port
*vnet
)
640 struct vio_driver_state
*vio
= &vnet
->vio
;
642 return !!(vio
->hs_state
& VIO_HS_COMPLETE
);
645 static int vnet_event_napi(struct vnet_port
*port
, int budget
)
647 struct vio_driver_state
*vio
= &port
->vio
;
650 int event
= (port
->rx_event
& LDC_EVENT_RESET
);
653 if (unlikely(event
== LDC_EVENT_RESET
||
654 event
== LDC_EVENT_UP
)) {
655 vio_link_state_change(vio
, event
);
657 if (event
== LDC_EVENT_RESET
) {
664 /* We may have multiple LDC events in rx_event. Unroll send_events() */
665 event
= (port
->rx_event
& LDC_EVENT_UP
);
666 port
->rx_event
&= ~(LDC_EVENT_RESET
|LDC_EVENT_UP
);
667 if (event
== LDC_EVENT_UP
)
669 event
= port
->rx_event
;
670 if (!(event
& LDC_EVENT_DATA_READY
))
673 /* we dont expect any other bits than RESET, UP, DATA_READY */
674 BUG_ON(event
!= LDC_EVENT_DATA_READY
);
679 struct vio_msg_tag tag
;
683 if (port
->napi_resume
) {
684 struct vio_dring_data
*pkt
=
685 (struct vio_dring_data
*)&msgbuf
;
686 struct vio_dring_state
*dr
=
687 &port
->vio
.drings
[VIO_DRIVER_RX_RING
];
689 pkt
->tag
.type
= VIO_TYPE_DATA
;
690 pkt
->tag
.stype
= VIO_SUBTYPE_INFO
;
691 pkt
->tag
.stype_env
= VIO_DRING_DATA
;
692 pkt
->seq
= dr
->rcv_nxt
;
693 pkt
->start_idx
= next_idx(port
->napi_stop_idx
, dr
);
698 err
= ldc_read(vio
->lp
, &msgbuf
, sizeof(msgbuf
));
699 if (unlikely(err
< 0)) {
700 if (err
== -ECONNRESET
)
706 viodbg(DATA
, "TAG [%02x:%02x:%04x:%08x]\n",
709 msgbuf
.tag
.stype_env
,
711 err
= vio_validate_sid(vio
, &msgbuf
.tag
);
715 if (likely(msgbuf
.tag
.type
== VIO_TYPE_DATA
)) {
716 if (msgbuf
.tag
.stype
== VIO_SUBTYPE_INFO
) {
717 if (!port_is_up(port
)) {
718 /* failures like handshake_failure()
719 * may have cleaned up dring, but
720 * NAPI polling may bring us here.
725 err
= vnet_rx(port
, &msgbuf
, &npkts
, budget
);
728 if (npkts
== 0 && err
!= -ECONNRESET
)
730 } else if (msgbuf
.tag
.stype
== VIO_SUBTYPE_ACK
) {
731 err
= vnet_ack(port
, &msgbuf
);
734 } else if (msgbuf
.tag
.stype
== VIO_SUBTYPE_NACK
) {
735 err
= vnet_nack(port
, &msgbuf
);
737 } else if (msgbuf
.tag
.type
== VIO_TYPE_CTRL
) {
738 if (msgbuf
.tag
.stype_env
== VNET_MCAST_INFO
)
739 err
= handle_mcast(port
, &msgbuf
);
741 err
= vio_control_pkt_engine(vio
, &msgbuf
);
745 err
= vnet_handle_unknown(port
, &msgbuf
);
747 if (err
== -ECONNRESET
)
750 if (unlikely(tx_wakeup
&& err
!= -ECONNRESET
))
751 maybe_tx_wakeup(port
->vp
);
755 static int vnet_poll(struct napi_struct
*napi
, int budget
)
757 struct vnet_port
*port
= container_of(napi
, struct vnet_port
, napi
);
758 struct vio_driver_state
*vio
= &port
->vio
;
759 int processed
= vnet_event_napi(port
, budget
);
761 if (processed
< budget
) {
763 port
->rx_event
&= ~LDC_EVENT_DATA_READY
;
764 vio_set_intr(vio
->vdev
->rx_ino
, HV_INTR_ENABLED
);
769 static void vnet_event(void *arg
, int event
)
771 struct vnet_port
*port
= arg
;
772 struct vio_driver_state
*vio
= &port
->vio
;
774 port
->rx_event
|= event
;
775 vio_set_intr(vio
->vdev
->rx_ino
, HV_INTR_DISABLED
);
776 napi_schedule(&port
->napi
);
780 static int __vnet_tx_trigger(struct vnet_port
*port
, u32 start
)
782 struct vio_dring_state
*dr
= &port
->vio
.drings
[VIO_DRIVER_TX_RING
];
783 struct vio_dring_data hdr
= {
785 .type
= VIO_TYPE_DATA
,
786 .stype
= VIO_SUBTYPE_INFO
,
787 .stype_env
= VIO_DRING_DATA
,
788 .sid
= vio_send_sid(&port
->vio
),
790 .dring_ident
= dr
->ident
,
798 err
= vnet_send_ack(port
,
799 &port
->vio
.drings
[VIO_DRIVER_RX_RING
],
800 port
->stop_rx_idx
, -1,
806 hdr
.seq
= dr
->snd_nxt
;
809 err
= vio_ldc_send(&port
->vio
, &hdr
, sizeof(hdr
));
815 if ((delay
<<= 1) > 128)
817 if (retries
++ > VNET_MAX_RETRIES
)
819 } while (err
== -EAGAIN
);
824 struct vnet_port
*__tx_port_find(struct vnet
*vp
, struct sk_buff
*skb
)
826 unsigned int hash
= vnet_hashfn(skb
->data
);
827 struct hlist_head
*hp
= &vp
->port_hash
[hash
];
828 struct vnet_port
*port
;
830 hlist_for_each_entry_rcu(port
, hp
, hash
) {
831 if (!port_is_up(port
))
833 if (ether_addr_equal(port
->raddr
, skb
->data
))
836 list_for_each_entry_rcu(port
, &vp
->port_list
, list
) {
837 if (!port
->switch_port
)
839 if (!port_is_up(port
))
846 static struct sk_buff
*vnet_clean_tx_ring(struct vnet_port
*port
,
849 struct vio_dring_state
*dr
= &port
->vio
.drings
[VIO_DRIVER_TX_RING
];
850 struct sk_buff
*skb
= NULL
;
857 txi
= VNET_TX_RING_SIZE
-1;
859 for (i
= 0; i
< VNET_TX_RING_SIZE
; ++i
) {
860 struct vio_net_desc
*d
;
862 d
= vio_dring_entry(dr
, txi
);
864 if (d
->hdr
.state
== VIO_DESC_DONE
) {
865 if (port
->tx_bufs
[txi
].skb
) {
866 BUG_ON(port
->tx_bufs
[txi
].skb
->next
);
868 port
->tx_bufs
[txi
].skb
->next
= skb
;
869 skb
= port
->tx_bufs
[txi
].skb
;
870 port
->tx_bufs
[txi
].skb
= NULL
;
872 ldc_unmap(port
->vio
.lp
,
873 port
->tx_bufs
[txi
].cookies
,
874 port
->tx_bufs
[txi
].ncookies
);
876 d
->hdr
.state
= VIO_DESC_FREE
;
877 } else if (d
->hdr
.state
== VIO_DESC_READY
) {
879 } else if (d
->hdr
.state
== VIO_DESC_FREE
) {
884 txi
= VNET_TX_RING_SIZE
-1;
889 static inline void vnet_free_skbs(struct sk_buff
*skb
)
891 struct sk_buff
*next
;
901 static void vnet_clean_timer_expire(unsigned long port0
)
903 struct vnet_port
*port
= (struct vnet_port
*)port0
;
904 struct sk_buff
*freeskbs
;
907 netif_tx_lock(port
->vp
->dev
);
908 freeskbs
= vnet_clean_tx_ring(port
, &pending
);
909 netif_tx_unlock(port
->vp
->dev
);
911 vnet_free_skbs(freeskbs
);
914 (void)mod_timer(&port
->clean_timer
,
915 jiffies
+ VNET_CLEAN_TIMEOUT
);
917 del_timer(&port
->clean_timer
);
920 static inline struct sk_buff
*vnet_skb_shape(struct sk_buff
*skb
, void **pstart
,
923 struct sk_buff
*nskb
;
928 if (len
< ETH_ZLEN
) {
929 pad
+= ETH_ZLEN
- skb
->len
;
932 len
+= VNET_PACKET_SKIP
;
933 pad
+= 8 - (len
& 7);
934 len
+= 8 - (len
& 7);
936 if (((unsigned long)skb
->data
& 7) != VNET_PACKET_SKIP
||
937 skb_tailroom(skb
) < pad
||
938 skb_headroom(skb
) < VNET_PACKET_SKIP
) {
939 nskb
= alloc_and_align_skb(skb
->dev
, skb
->len
);
940 skb_reserve(nskb
, VNET_PACKET_SKIP
);
941 if (skb_copy_bits(skb
, 0, nskb
->data
, skb
->len
)) {
946 (void)skb_put(nskb
, skb
->len
);
951 *pstart
= skb
->data
- VNET_PACKET_SKIP
;
956 static int vnet_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
958 struct vnet
*vp
= netdev_priv(dev
);
959 struct vnet_port
*port
= NULL
;
960 struct vio_dring_state
*dr
;
961 struct vio_net_desc
*d
;
963 struct sk_buff
*freeskbs
= NULL
;
967 unsigned pending
= 0;
969 skb
= vnet_skb_shape(skb
, &start
, &nlen
);
974 port
= __tx_port_find(vp
, skb
);
978 if (skb
->len
> port
->rmtu
) {
979 unsigned long localmtu
= port
->rmtu
- ETH_HLEN
;
981 if (vio_version_after_eq(&port
->vio
, 1, 3))
982 localmtu
-= VLAN_HLEN
;
984 if (skb
->protocol
== htons(ETH_P_IP
)) {
986 struct rtable
*rt
= NULL
;
988 memset(&fl4
, 0, sizeof(fl4
));
989 fl4
.flowi4_oif
= dev
->ifindex
;
990 fl4
.flowi4_tos
= RT_TOS(ip_hdr(skb
)->tos
);
991 fl4
.daddr
= ip_hdr(skb
)->daddr
;
992 fl4
.saddr
= ip_hdr(skb
)->saddr
;
994 rt
= ip_route_output_key(dev_net(dev
), &fl4
);
997 skb_dst_set(skb
, &rt
->dst
);
998 icmp_send(skb
, ICMP_DEST_UNREACH
,
1003 #if IS_ENABLED(CONFIG_IPV6)
1004 else if (skb
->protocol
== htons(ETH_P_IPV6
))
1005 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, localmtu
);
1010 dr
= &port
->vio
.drings
[VIO_DRIVER_TX_RING
];
1011 if (unlikely(vnet_tx_dring_avail(dr
) < 1)) {
1012 if (!netif_queue_stopped(dev
)) {
1013 netif_stop_queue(dev
);
1015 /* This is a hard error, log it. */
1016 netdev_err(dev
, "BUG! Tx Ring full when queue awake!\n");
1017 dev
->stats
.tx_errors
++;
1020 return NETDEV_TX_BUSY
;
1023 d
= vio_dring_cur(dr
);
1027 freeskbs
= vnet_clean_tx_ring(port
, &pending
);
1029 BUG_ON(port
->tx_bufs
[txi
].skb
);
1035 port
->tx_bufs
[txi
].skb
= skb
;
1038 err
= ldc_map_single(port
->vio
.lp
, start
, nlen
,
1039 port
->tx_bufs
[txi
].cookies
, VNET_MAXCOOKIES
,
1040 (LDC_MAP_SHADOW
| LDC_MAP_DIRECT
| LDC_MAP_RW
));
1042 netdev_info(dev
, "tx buffer map error %d\n", err
);
1045 port
->tx_bufs
[txi
].ncookies
= err
;
1047 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1048 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1049 * the protocol itself does not require it as long as the peer
1050 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1052 * An ACK for every packet in the ring is expensive as the
1053 * sending of LDC messages is slow and affects performance.
1055 d
->hdr
.ack
= VIO_ACK_DISABLE
;
1057 d
->ncookies
= port
->tx_bufs
[txi
].ncookies
;
1058 for (i
= 0; i
< d
->ncookies
; i
++)
1059 d
->cookies
[i
] = port
->tx_bufs
[txi
].cookies
[i
];
1061 /* This has to be a non-SMP write barrier because we are writing
1062 * to memory which is shared with the peer LDOM.
1066 d
->hdr
.state
= VIO_DESC_READY
;
1068 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1069 * to notify the consumer that some descriptors are READY.
1070 * After that "start" trigger, no additional triggers are needed until
1071 * a DRING_STOPPED is received from the consumer. The dr->cons field
1072 * (set up by vnet_ack()) has the value of the next dring index
1073 * that has not yet been ack-ed. We send a "start" trigger here
1074 * if, and only if, start_cons is true (reset it afterward). Conversely,
1075 * vnet_ack() should check if the dring corresponding to cons
1076 * is marked READY, but start_cons was false.
1077 * If so, vnet_ack() should send out the missed "start" trigger.
1079 * Note that the wmb() above makes sure the cookies et al. are
1080 * not globally visible before the VIO_DESC_READY, and that the
1081 * stores are ordered correctly by the compiler. The consumer will
1082 * not proceed until the VIO_DESC_READY is visible assuring that
1083 * the consumer does not observe anything related to descriptors
1084 * out of order. The HV trap from the LDC start trigger is the
1085 * producer to consumer announcement that work is available to the
1088 if (!port
->start_cons
)
1089 goto ldc_start_done
; /* previous trigger suffices */
1091 err
= __vnet_tx_trigger(port
, dr
->cons
);
1092 if (unlikely(err
< 0)) {
1093 netdev_info(dev
, "TX trigger error %d\n", err
);
1094 d
->hdr
.state
= VIO_DESC_FREE
;
1095 dev
->stats
.tx_carrier_errors
++;
1100 port
->start_cons
= false;
1102 dev
->stats
.tx_packets
++;
1103 dev
->stats
.tx_bytes
+= port
->tx_bufs
[txi
].skb
->len
;
1105 dr
->prod
= (dr
->prod
+ 1) & (VNET_TX_RING_SIZE
- 1);
1106 if (unlikely(vnet_tx_dring_avail(dr
) < 1)) {
1107 netif_stop_queue(dev
);
1108 if (vnet_tx_dring_avail(dr
) > VNET_TX_WAKEUP_THRESH(dr
))
1109 netif_wake_queue(dev
);
1112 (void)mod_timer(&port
->clean_timer
, jiffies
+ VNET_CLEAN_TIMEOUT
);
1115 vnet_free_skbs(freeskbs
);
1117 return NETDEV_TX_OK
;
1121 (void)mod_timer(&port
->clean_timer
,
1122 jiffies
+ VNET_CLEAN_TIMEOUT
);
1124 del_timer(&port
->clean_timer
);
1129 vnet_free_skbs(freeskbs
);
1130 dev
->stats
.tx_dropped
++;
1131 return NETDEV_TX_OK
;
1134 static void vnet_tx_timeout(struct net_device
*dev
)
1136 /* XXX Implement me XXX */
1139 static int vnet_open(struct net_device
*dev
)
1141 netif_carrier_on(dev
);
1142 netif_start_queue(dev
);
1147 static int vnet_close(struct net_device
*dev
)
1149 netif_stop_queue(dev
);
1150 netif_carrier_off(dev
);
1155 static struct vnet_mcast_entry
*__vnet_mc_find(struct vnet
*vp
, u8
*addr
)
1157 struct vnet_mcast_entry
*m
;
1159 for (m
= vp
->mcast_list
; m
; m
= m
->next
) {
1160 if (ether_addr_equal(m
->addr
, addr
))
1166 static void __update_mc_list(struct vnet
*vp
, struct net_device
*dev
)
1168 struct netdev_hw_addr
*ha
;
1170 netdev_for_each_mc_addr(ha
, dev
) {
1171 struct vnet_mcast_entry
*m
;
1173 m
= __vnet_mc_find(vp
, ha
->addr
);
1180 m
= kzalloc(sizeof(*m
), GFP_ATOMIC
);
1183 memcpy(m
->addr
, ha
->addr
, ETH_ALEN
);
1186 m
->next
= vp
->mcast_list
;
1192 static void __send_mc_list(struct vnet
*vp
, struct vnet_port
*port
)
1194 struct vio_net_mcast_info info
;
1195 struct vnet_mcast_entry
*m
, **pp
;
1198 memset(&info
, 0, sizeof(info
));
1200 info
.tag
.type
= VIO_TYPE_CTRL
;
1201 info
.tag
.stype
= VIO_SUBTYPE_INFO
;
1202 info
.tag
.stype_env
= VNET_MCAST_INFO
;
1203 info
.tag
.sid
= vio_send_sid(&port
->vio
);
1207 for (m
= vp
->mcast_list
; m
; m
= m
->next
) {
1211 memcpy(&info
.mcast_addr
[n_addrs
* ETH_ALEN
],
1213 if (++n_addrs
== VNET_NUM_MCAST
) {
1214 info
.count
= n_addrs
;
1216 (void) vio_ldc_send(&port
->vio
, &info
,
1222 info
.count
= n_addrs
;
1223 (void) vio_ldc_send(&port
->vio
, &info
, sizeof(info
));
1229 pp
= &vp
->mcast_list
;
1230 while ((m
= *pp
) != NULL
) {
1237 memcpy(&info
.mcast_addr
[n_addrs
* ETH_ALEN
],
1239 if (++n_addrs
== VNET_NUM_MCAST
) {
1240 info
.count
= n_addrs
;
1241 (void) vio_ldc_send(&port
->vio
, &info
,
1250 info
.count
= n_addrs
;
1251 (void) vio_ldc_send(&port
->vio
, &info
, sizeof(info
));
1255 static void vnet_set_rx_mode(struct net_device
*dev
)
1257 struct vnet
*vp
= netdev_priv(dev
);
1258 struct vnet_port
*port
;
1261 list_for_each_entry_rcu(port
, &vp
->port_list
, list
) {
1263 if (port
->switch_port
) {
1264 __update_mc_list(vp
, dev
);
1265 __send_mc_list(vp
, port
);
1272 static int vnet_change_mtu(struct net_device
*dev
, int new_mtu
)
1274 if (new_mtu
< 68 || new_mtu
> 65535)
1281 static int vnet_set_mac_addr(struct net_device
*dev
, void *p
)
1286 static void vnet_get_drvinfo(struct net_device
*dev
,
1287 struct ethtool_drvinfo
*info
)
1289 strlcpy(info
->driver
, DRV_MODULE_NAME
, sizeof(info
->driver
));
1290 strlcpy(info
->version
, DRV_MODULE_VERSION
, sizeof(info
->version
));
1293 static u32
vnet_get_msglevel(struct net_device
*dev
)
1295 struct vnet
*vp
= netdev_priv(dev
);
1296 return vp
->msg_enable
;
1299 static void vnet_set_msglevel(struct net_device
*dev
, u32 value
)
1301 struct vnet
*vp
= netdev_priv(dev
);
1302 vp
->msg_enable
= value
;
1305 static const struct ethtool_ops vnet_ethtool_ops
= {
1306 .get_drvinfo
= vnet_get_drvinfo
,
1307 .get_msglevel
= vnet_get_msglevel
,
1308 .set_msglevel
= vnet_set_msglevel
,
1309 .get_link
= ethtool_op_get_link
,
1312 static void vnet_port_free_tx_bufs(struct vnet_port
*port
)
1314 struct vio_dring_state
*dr
;
1317 dr
= &port
->vio
.drings
[VIO_DRIVER_TX_RING
];
1319 ldc_free_exp_dring(port
->vio
.lp
, dr
->base
,
1320 (dr
->entry_size
* dr
->num_entries
),
1321 dr
->cookies
, dr
->ncookies
);
1324 dr
->num_entries
= 0;
1329 for (i
= 0; i
< VNET_TX_RING_SIZE
; i
++) {
1330 struct vio_net_desc
*d
;
1331 void *skb
= port
->tx_bufs
[i
].skb
;
1336 d
= vio_dring_entry(dr
, i
);
1337 if (d
->hdr
.state
== VIO_DESC_READY
)
1338 pr_warn("active transmit buffers freed\n");
1340 ldc_unmap(port
->vio
.lp
,
1341 port
->tx_bufs
[i
].cookies
,
1342 port
->tx_bufs
[i
].ncookies
);
1344 port
->tx_bufs
[i
].skb
= NULL
;
1345 d
->hdr
.state
= VIO_DESC_FREE
;
1349 static int vnet_port_alloc_tx_bufs(struct vnet_port
*port
)
1351 struct vio_dring_state
*dr
;
1353 int i
, err
, ncookies
;
1356 dr
= &port
->vio
.drings
[VIO_DRIVER_TX_RING
];
1358 len
= (VNET_TX_RING_SIZE
*
1359 (sizeof(struct vio_net_desc
) +
1360 (sizeof(struct ldc_trans_cookie
) * 2)));
1362 ncookies
= VIO_MAX_RING_COOKIES
;
1363 dring
= ldc_alloc_exp_dring(port
->vio
.lp
, len
,
1364 dr
->cookies
, &ncookies
,
1368 if (IS_ERR(dring
)) {
1369 err
= PTR_ERR(dring
);
1374 dr
->entry_size
= (sizeof(struct vio_net_desc
) +
1375 (sizeof(struct ldc_trans_cookie
) * 2));
1376 dr
->num_entries
= VNET_TX_RING_SIZE
;
1377 dr
->prod
= dr
->cons
= 0;
1378 port
->start_cons
= true; /* need an initial trigger */
1379 dr
->pending
= VNET_TX_RING_SIZE
;
1380 dr
->ncookies
= ncookies
;
1382 for (i
= 0; i
< VNET_TX_RING_SIZE
; ++i
) {
1383 struct vio_net_desc
*d
;
1385 d
= vio_dring_entry(dr
, i
);
1386 d
->hdr
.state
= VIO_DESC_FREE
;
1391 vnet_port_free_tx_bufs(port
);
1396 #ifdef CONFIG_NET_POLL_CONTROLLER
1397 static void vnet_poll_controller(struct net_device
*dev
)
1399 struct vnet
*vp
= netdev_priv(dev
);
1400 struct vnet_port
*port
;
1401 unsigned long flags
;
1403 spin_lock_irqsave(&vp
->lock
, flags
);
1404 if (!list_empty(&vp
->port_list
)) {
1405 port
= list_entry(vp
->port_list
.next
, struct vnet_port
, list
);
1406 napi_schedule(&port
->napi
);
1408 spin_unlock_irqrestore(&vp
->lock
, flags
);
1411 static LIST_HEAD(vnet_list
);
1412 static DEFINE_MUTEX(vnet_list_mutex
);
1414 static const struct net_device_ops vnet_ops
= {
1415 .ndo_open
= vnet_open
,
1416 .ndo_stop
= vnet_close
,
1417 .ndo_set_rx_mode
= vnet_set_rx_mode
,
1418 .ndo_set_mac_address
= vnet_set_mac_addr
,
1419 .ndo_validate_addr
= eth_validate_addr
,
1420 .ndo_tx_timeout
= vnet_tx_timeout
,
1421 .ndo_change_mtu
= vnet_change_mtu
,
1422 .ndo_start_xmit
= vnet_start_xmit
,
1423 #ifdef CONFIG_NET_POLL_CONTROLLER
1424 .ndo_poll_controller
= vnet_poll_controller
,
1428 static struct vnet
*vnet_new(const u64
*local_mac
)
1430 struct net_device
*dev
;
1434 dev
= alloc_etherdev(sizeof(*vp
));
1436 return ERR_PTR(-ENOMEM
);
1437 dev
->needed_headroom
= VNET_PACKET_SKIP
+ 8;
1438 dev
->needed_tailroom
= 8;
1440 for (i
= 0; i
< ETH_ALEN
; i
++)
1441 dev
->dev_addr
[i
] = (*local_mac
>> (5 - i
) * 8) & 0xff;
1443 vp
= netdev_priv(dev
);
1445 spin_lock_init(&vp
->lock
);
1448 INIT_LIST_HEAD(&vp
->port_list
);
1449 for (i
= 0; i
< VNET_PORT_HASH_SIZE
; i
++)
1450 INIT_HLIST_HEAD(&vp
->port_hash
[i
]);
1451 INIT_LIST_HEAD(&vp
->list
);
1452 vp
->local_mac
= *local_mac
;
1454 dev
->netdev_ops
= &vnet_ops
;
1455 dev
->ethtool_ops
= &vnet_ethtool_ops
;
1456 dev
->watchdog_timeo
= VNET_TX_TIMEOUT
;
1458 err
= register_netdev(dev
);
1460 pr_err("Cannot register net device, aborting\n");
1461 goto err_out_free_dev
;
1464 netdev_info(dev
, "Sun LDOM vnet %pM\n", dev
->dev_addr
);
1466 list_add(&vp
->list
, &vnet_list
);
1473 return ERR_PTR(err
);
1476 static struct vnet
*vnet_find_or_create(const u64
*local_mac
)
1478 struct vnet
*iter
, *vp
;
1480 mutex_lock(&vnet_list_mutex
);
1482 list_for_each_entry(iter
, &vnet_list
, list
) {
1483 if (iter
->local_mac
== *local_mac
) {
1489 vp
= vnet_new(local_mac
);
1490 mutex_unlock(&vnet_list_mutex
);
1495 static void vnet_cleanup(void)
1498 struct net_device
*dev
;
1500 mutex_lock(&vnet_list_mutex
);
1501 while (!list_empty(&vnet_list
)) {
1502 vp
= list_first_entry(&vnet_list
, struct vnet
, list
);
1503 list_del(&vp
->list
);
1505 /* vio_unregister_driver() should have cleaned up port_list */
1506 BUG_ON(!list_empty(&vp
->port_list
));
1507 unregister_netdev(dev
);
1510 mutex_unlock(&vnet_list_mutex
);
1513 static const char *local_mac_prop
= "local-mac-address";
1515 static struct vnet
*vnet_find_parent(struct mdesc_handle
*hp
,
1518 const u64
*local_mac
= NULL
;
1521 mdesc_for_each_arc(a
, hp
, port_node
, MDESC_ARC_TYPE_BACK
) {
1522 u64 target
= mdesc_arc_target(hp
, a
);
1525 name
= mdesc_get_property(hp
, target
, "name", NULL
);
1526 if (!name
|| strcmp(name
, "network"))
1529 local_mac
= mdesc_get_property(hp
, target
,
1530 local_mac_prop
, NULL
);
1535 return ERR_PTR(-ENODEV
);
1537 return vnet_find_or_create(local_mac
);
1540 static struct ldc_channel_config vnet_ldc_cfg
= {
1541 .event
= vnet_event
,
1543 .mode
= LDC_MODE_UNRELIABLE
,
1546 static struct vio_driver_ops vnet_vio_ops
= {
1547 .send_attr
= vnet_send_attr
,
1548 .handle_attr
= vnet_handle_attr
,
1549 .handshake_complete
= vnet_handshake_complete
,
1552 static void print_version(void)
1554 printk_once(KERN_INFO
"%s", version
);
1557 const char *remote_macaddr_prop
= "remote-mac-address";
1559 static int vnet_port_probe(struct vio_dev
*vdev
, const struct vio_device_id
*id
)
1561 struct mdesc_handle
*hp
;
1562 struct vnet_port
*port
;
1563 unsigned long flags
;
1566 int len
, i
, err
, switch_port
;
1572 vp
= vnet_find_parent(hp
, vdev
->mp
);
1574 pr_err("Cannot find port parent vnet\n");
1576 goto err_out_put_mdesc
;
1579 rmac
= mdesc_get_property(hp
, vdev
->mp
, remote_macaddr_prop
, &len
);
1582 pr_err("Port lacks %s property\n", remote_macaddr_prop
);
1583 goto err_out_put_mdesc
;
1586 port
= kzalloc(sizeof(*port
), GFP_KERNEL
);
1589 goto err_out_put_mdesc
;
1591 for (i
= 0; i
< ETH_ALEN
; i
++)
1592 port
->raddr
[i
] = (*rmac
>> (5 - i
) * 8) & 0xff;
1596 err
= vio_driver_init(&port
->vio
, vdev
, VDEV_NETWORK
,
1597 vnet_versions
, ARRAY_SIZE(vnet_versions
),
1598 &vnet_vio_ops
, vp
->dev
->name
);
1600 goto err_out_free_port
;
1602 err
= vio_ldc_alloc(&port
->vio
, &vnet_ldc_cfg
, port
);
1604 goto err_out_free_port
;
1606 netif_napi_add(port
->vp
->dev
, &port
->napi
, vnet_poll
, NAPI_POLL_WEIGHT
);
1608 err
= vnet_port_alloc_tx_bufs(port
);
1610 goto err_out_free_ldc
;
1612 INIT_HLIST_NODE(&port
->hash
);
1613 INIT_LIST_HEAD(&port
->list
);
1616 if (mdesc_get_property(hp
, vdev
->mp
, "switch-port", NULL
) != NULL
)
1618 port
->switch_port
= switch_port
;
1620 spin_lock_irqsave(&vp
->lock
, flags
);
1622 list_add_rcu(&port
->list
, &vp
->port_list
);
1624 list_add_tail_rcu(&port
->list
, &vp
->port_list
);
1625 hlist_add_head_rcu(&port
->hash
,
1626 &vp
->port_hash
[vnet_hashfn(port
->raddr
)]);
1627 spin_unlock_irqrestore(&vp
->lock
, flags
);
1629 dev_set_drvdata(&vdev
->dev
, port
);
1631 pr_info("%s: PORT ( remote-mac %pM%s )\n",
1632 vp
->dev
->name
, port
->raddr
, switch_port
? " switch-port" : "");
1634 setup_timer(&port
->clean_timer
, vnet_clean_timer_expire
,
1635 (unsigned long)port
);
1637 napi_enable(&port
->napi
);
1638 vio_port_up(&port
->vio
);
1645 netif_napi_del(&port
->napi
);
1646 vio_ldc_free(&port
->vio
);
1656 static int vnet_port_remove(struct vio_dev
*vdev
)
1658 struct vnet_port
*port
= dev_get_drvdata(&vdev
->dev
);
1662 del_timer_sync(&port
->vio
.timer
);
1664 napi_disable(&port
->napi
);
1666 list_del_rcu(&port
->list
);
1667 hlist_del_rcu(&port
->hash
);
1670 del_timer_sync(&port
->clean_timer
);
1671 netif_napi_del(&port
->napi
);
1672 vnet_port_free_tx_bufs(port
);
1673 vio_ldc_free(&port
->vio
);
1675 dev_set_drvdata(&vdev
->dev
, NULL
);
1683 static const struct vio_device_id vnet_port_match
[] = {
1685 .type
= "vnet-port",
1689 MODULE_DEVICE_TABLE(vio
, vnet_port_match
);
1691 static struct vio_driver vnet_port_driver
= {
1692 .id_table
= vnet_port_match
,
1693 .probe
= vnet_port_probe
,
1694 .remove
= vnet_port_remove
,
1695 .name
= "vnet_port",
1698 static int __init
vnet_init(void)
1700 return vio_register_driver(&vnet_port_driver
);
1703 static void __exit
vnet_exit(void)
1705 vio_unregister_driver(&vnet_port_driver
);
1709 module_init(vnet_init
);
1710 module_exit(vnet_exit
);