2 * Copyright (c) 2009, Microsoft Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23 #include <linux/init.h>
24 #include <linux/atomic.h>
25 #include <linux/module.h>
26 #include <linux/highmem.h>
27 #include <linux/device.h>
29 #include <linux/delay.h>
30 #include <linux/netdevice.h>
31 #include <linux/inetdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/skbuff.h>
35 #include <linux/slab.h>
37 #include <net/route.h>
39 #include <net/pkt_sched.h>
41 #include "hyperv_net.h"
43 struct net_device_context
{
44 /* point back to our device context */
45 struct hv_device
*device_ctx
;
46 struct delayed_work dwork
;
50 static int ring_size
= 128;
51 module_param(ring_size
, int, S_IRUGO
);
52 MODULE_PARM_DESC(ring_size
, "Ring buffer size (# of pages)");
54 struct set_multicast_work
{
55 struct work_struct work
;
56 struct net_device
*net
;
59 static void do_set_multicast(struct work_struct
*w
)
61 struct set_multicast_work
*swk
=
62 container_of(w
, struct set_multicast_work
, work
);
63 struct net_device
*net
= swk
->net
;
65 struct net_device_context
*ndevctx
= netdev_priv(net
);
66 struct netvsc_device
*nvdev
;
67 struct rndis_device
*rdev
;
69 nvdev
= hv_get_drvdata(ndevctx
->device_ctx
);
73 rdev
= nvdev
->extension
;
77 if (net
->flags
& IFF_PROMISC
)
78 rndis_filter_set_packet_filter(rdev
,
79 NDIS_PACKET_TYPE_PROMISCUOUS
);
81 rndis_filter_set_packet_filter(rdev
,
82 NDIS_PACKET_TYPE_BROADCAST
|
83 NDIS_PACKET_TYPE_ALL_MULTICAST
|
84 NDIS_PACKET_TYPE_DIRECTED
);
89 static void netvsc_set_multicast_list(struct net_device
*net
)
91 struct set_multicast_work
*swk
=
92 kmalloc(sizeof(struct set_multicast_work
), GFP_ATOMIC
);
97 INIT_WORK(&swk
->work
, do_set_multicast
);
98 schedule_work(&swk
->work
);
101 static int netvsc_open(struct net_device
*net
)
103 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
104 struct hv_device
*device_obj
= net_device_ctx
->device_ctx
;
107 /* Open up the device */
108 ret
= rndis_filter_open(device_obj
);
110 netdev_err(net
, "unable to open device (ret %d).\n", ret
);
114 netif_start_queue(net
);
119 static int netvsc_close(struct net_device
*net
)
121 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
122 struct hv_device
*device_obj
= net_device_ctx
->device_ctx
;
125 netif_stop_queue(net
);
127 ret
= rndis_filter_close(device_obj
);
129 netdev_err(net
, "unable to close device (ret %d).\n", ret
);
134 static void netvsc_xmit_completion(void *context
)
136 struct hv_netvsc_packet
*packet
= (struct hv_netvsc_packet
*)context
;
137 struct sk_buff
*skb
= (struct sk_buff
*)
138 (unsigned long)packet
->completion
.send
.send_completion_tid
;
143 dev_kfree_skb_any(skb
);
146 static int netvsc_start_xmit(struct sk_buff
*skb
, struct net_device
*net
)
148 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
149 struct hv_netvsc_packet
*packet
;
151 unsigned int i
, num_pages
, npg_data
;
153 /* Add multipage for skb->data and additional one for RNDIS */
154 npg_data
= (((unsigned long)skb
->data
+ skb_headlen(skb
) - 1)
155 >> PAGE_SHIFT
) - ((unsigned long)skb
->data
>> PAGE_SHIFT
) + 1;
156 num_pages
= skb_shinfo(skb
)->nr_frags
+ npg_data
+ 1;
158 /* Allocate a netvsc packet based on # of frags. */
159 packet
= kzalloc(sizeof(struct hv_netvsc_packet
) +
160 (num_pages
* sizeof(struct hv_page_buffer
)) +
161 sizeof(struct rndis_filter_packet
), GFP_ATOMIC
);
163 /* out of memory, drop packet */
164 netdev_err(net
, "unable to allocate hv_netvsc_packet\n");
167 net
->stats
.tx_dropped
++;
168 return NETDEV_TX_BUSY
;
171 packet
->extension
= (void *)(unsigned long)packet
+
172 sizeof(struct hv_netvsc_packet
) +
173 (num_pages
* sizeof(struct hv_page_buffer
));
175 /* Setup the rndis header */
176 packet
->page_buf_cnt
= num_pages
;
178 /* Initialize it from the skb */
179 packet
->total_data_buflen
= skb
->len
;
181 /* Start filling in the page buffers starting after RNDIS buffer. */
182 packet
->page_buf
[1].pfn
= virt_to_phys(skb
->data
) >> PAGE_SHIFT
;
183 packet
->page_buf
[1].offset
184 = (unsigned long)skb
->data
& (PAGE_SIZE
- 1);
186 packet
->page_buf
[1].len
= skb_headlen(skb
);
188 packet
->page_buf
[1].len
= PAGE_SIZE
189 - packet
->page_buf
[1].offset
;
191 for (i
= 2; i
<= npg_data
; i
++) {
192 packet
->page_buf
[i
].pfn
= virt_to_phys(skb
->data
193 + PAGE_SIZE
* (i
-1)) >> PAGE_SHIFT
;
194 packet
->page_buf
[i
].offset
= 0;
195 packet
->page_buf
[i
].len
= PAGE_SIZE
;
198 packet
->page_buf
[npg_data
].len
= (((unsigned long)skb
->data
199 + skb_headlen(skb
) - 1) & (PAGE_SIZE
- 1)) + 1;
201 /* Additional fragments are after SKB data */
202 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
203 const skb_frag_t
*f
= &skb_shinfo(skb
)->frags
[i
];
205 packet
->page_buf
[i
+npg_data
+1].pfn
=
206 page_to_pfn(skb_frag_page(f
));
207 packet
->page_buf
[i
+npg_data
+1].offset
= f
->page_offset
;
208 packet
->page_buf
[i
+npg_data
+1].len
= skb_frag_size(f
);
211 /* Set the completion routine */
212 packet
->completion
.send
.send_completion
= netvsc_xmit_completion
;
213 packet
->completion
.send
.send_completion_ctx
= packet
;
214 packet
->completion
.send
.send_completion_tid
= (unsigned long)skb
;
216 ret
= rndis_filter_send(net_device_ctx
->device_ctx
,
219 net
->stats
.tx_bytes
+= skb
->len
;
220 net
->stats
.tx_packets
++;
222 /* we are shutting down or bus overloaded, just drop packet */
223 net
->stats
.tx_dropped
++;
225 dev_kfree_skb_any(skb
);
228 return ret
? NETDEV_TX_BUSY
: NETDEV_TX_OK
;
232 * netvsc_linkstatus_callback - Link up/down notification
234 void netvsc_linkstatus_callback(struct hv_device
*device_obj
,
237 struct net_device
*net
;
238 struct net_device_context
*ndev_ctx
;
239 struct netvsc_device
*net_device
;
241 net_device
= hv_get_drvdata(device_obj
);
242 net
= net_device
->ndev
;
245 netdev_err(net
, "got link status but net device "
246 "not initialized yet\n");
251 netif_carrier_on(net
);
252 netif_wake_queue(net
);
253 ndev_ctx
= netdev_priv(net
);
254 schedule_delayed_work(&ndev_ctx
->dwork
, 0);
255 schedule_delayed_work(&ndev_ctx
->dwork
, msecs_to_jiffies(20));
257 netif_carrier_off(net
);
258 netif_stop_queue(net
);
263 * netvsc_recv_callback - Callback when we receive a packet from the
264 * "wire" on the specified device.
266 int netvsc_recv_callback(struct hv_device
*device_obj
,
267 struct hv_netvsc_packet
*packet
)
269 struct net_device
*net
= dev_get_drvdata(&device_obj
->device
);
271 struct netvsc_device
*net_device
;
273 net_device
= hv_get_drvdata(device_obj
);
274 net
= net_device
->ndev
;
277 netdev_err(net
, "got receive callback but net device"
278 " not initialized yet\n");
282 /* Allocate a skb - TODO direct I/O to pages? */
283 skb
= netdev_alloc_skb_ip_align(net
, packet
->total_data_buflen
);
284 if (unlikely(!skb
)) {
285 ++net
->stats
.rx_dropped
;
290 * Copy to skb. This copy is needed here since the memory pointed by
291 * hv_netvsc_packet cannot be deallocated
293 memcpy(skb_put(skb
, packet
->total_data_buflen
), packet
->data
,
294 packet
->total_data_buflen
);
296 skb
->protocol
= eth_type_trans(skb
, net
);
297 skb
->ip_summed
= CHECKSUM_NONE
;
299 net
->stats
.rx_packets
++;
300 net
->stats
.rx_bytes
+= skb
->len
;
303 * Pass the skb back up. Network stack will deallocate the skb when it
312 static void netvsc_get_drvinfo(struct net_device
*net
,
313 struct ethtool_drvinfo
*info
)
315 strcpy(info
->driver
, "hv_netvsc");
316 strcpy(info
->version
, HV_DRV_VERSION
);
317 strcpy(info
->fw_version
, "N/A");
320 static int netvsc_change_mtu(struct net_device
*ndev
, int mtu
)
322 struct net_device_context
*ndevctx
= netdev_priv(ndev
);
323 struct hv_device
*hdev
= ndevctx
->device_ctx
;
324 struct netvsc_device
*nvdev
= hv_get_drvdata(hdev
);
325 struct netvsc_device_info device_info
;
326 int limit
= ETH_DATA_LEN
;
328 if (nvdev
== NULL
|| nvdev
->destroy
)
331 if (nvdev
->nvsp_version
== NVSP_PROTOCOL_VERSION_2
)
334 if (mtu
< 68 || mtu
> limit
)
337 nvdev
->start_remove
= true;
338 cancel_delayed_work_sync(&ndevctx
->dwork
);
339 netif_stop_queue(ndev
);
340 rndis_filter_device_remove(hdev
);
344 ndevctx
->device_ctx
= hdev
;
345 hv_set_drvdata(hdev
, ndev
);
346 device_info
.ring_size
= ring_size
;
347 rndis_filter_device_add(hdev
, &device_info
);
348 netif_wake_queue(ndev
);
353 static const struct ethtool_ops ethtool_ops
= {
354 .get_drvinfo
= netvsc_get_drvinfo
,
355 .get_link
= ethtool_op_get_link
,
358 static const struct net_device_ops device_ops
= {
359 .ndo_open
= netvsc_open
,
360 .ndo_stop
= netvsc_close
,
361 .ndo_start_xmit
= netvsc_start_xmit
,
362 .ndo_set_rx_mode
= netvsc_set_multicast_list
,
363 .ndo_change_mtu
= netvsc_change_mtu
,
364 .ndo_validate_addr
= eth_validate_addr
,
365 .ndo_set_mac_address
= eth_mac_addr
,
369 * Send GARP packet to network peers after migrations.
370 * After Quick Migration, the network is not immediately operational in the
371 * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
372 * another netif_notify_peers() into a delayed work, otherwise GARP packet
373 * will not be sent after quick migration, and cause network disconnection.
375 static void netvsc_send_garp(struct work_struct
*w
)
377 struct net_device_context
*ndev_ctx
;
378 struct net_device
*net
;
379 struct netvsc_device
*net_device
;
381 ndev_ctx
= container_of(w
, struct net_device_context
, dwork
.work
);
382 net_device
= hv_get_drvdata(ndev_ctx
->device_ctx
);
383 net
= net_device
->ndev
;
384 netif_notify_peers(net
);
388 static int netvsc_probe(struct hv_device
*dev
,
389 const struct hv_vmbus_device_id
*dev_id
)
391 struct net_device
*net
= NULL
;
392 struct net_device_context
*net_device_ctx
;
393 struct netvsc_device_info device_info
;
396 net
= alloc_etherdev(sizeof(struct net_device_context
));
400 /* Set initial state */
401 netif_carrier_off(net
);
403 net_device_ctx
= netdev_priv(net
);
404 net_device_ctx
->device_ctx
= dev
;
405 hv_set_drvdata(dev
, net
);
406 INIT_DELAYED_WORK(&net_device_ctx
->dwork
, netvsc_send_garp
);
408 net
->netdev_ops
= &device_ops
;
410 /* TODO: Add GSO and Checksum offload */
411 net
->hw_features
= NETIF_F_SG
;
412 net
->features
= NETIF_F_SG
;
414 SET_ETHTOOL_OPS(net
, ðtool_ops
);
415 SET_NETDEV_DEV(net
, &dev
->device
);
417 ret
= register_netdev(net
);
419 pr_err("Unable to register netdev.\n");
424 /* Notify the netvsc driver of the new device */
425 device_info
.ring_size
= ring_size
;
426 ret
= rndis_filter_device_add(dev
, &device_info
);
428 netdev_err(net
, "unable to add netvsc device (ret %d)\n", ret
);
429 unregister_netdev(net
);
431 hv_set_drvdata(dev
, NULL
);
434 memcpy(net
->dev_addr
, device_info
.mac_adr
, ETH_ALEN
);
436 netif_carrier_on(net
);
442 static int netvsc_remove(struct hv_device
*dev
)
444 struct net_device
*net
;
445 struct net_device_context
*ndev_ctx
;
446 struct netvsc_device
*net_device
;
448 net_device
= hv_get_drvdata(dev
);
449 net
= net_device
->ndev
;
452 dev_err(&dev
->device
, "No net device to remove\n");
456 net_device
->start_remove
= true;
458 ndev_ctx
= netdev_priv(net
);
459 cancel_delayed_work_sync(&ndev_ctx
->dwork
);
461 /* Stop outbound asap */
462 netif_stop_queue(net
);
464 unregister_netdev(net
);
467 * Call to the vsc driver to let it know that the device is being
470 rndis_filter_device_remove(dev
);
476 static const struct hv_vmbus_device_id id_table
[] = {
478 { VMBUS_DEVICE(0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
479 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E) },
483 MODULE_DEVICE_TABLE(vmbus
, id_table
);
485 /* The one and only one */
486 static struct hv_driver netvsc_drv
= {
488 .id_table
= id_table
,
489 .probe
= netvsc_probe
,
490 .remove
= netvsc_remove
,
493 static void __exit
netvsc_drv_exit(void)
495 vmbus_driver_unregister(&netvsc_drv
);
498 static int __init
netvsc_drv_init(void)
500 return vmbus_driver_register(&netvsc_drv
);
503 MODULE_LICENSE("GPL");
504 MODULE_VERSION(HV_DRV_VERSION
);
505 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
507 module_init(netvsc_drv_init
);
508 module_exit(netvsc_drv_exit
);