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>
34 #include <linux/if_vlan.h>
36 #include <linux/slab.h>
38 #include <net/route.h>
40 #include <net/pkt_sched.h>
42 #include "hyperv_net.h"
44 struct net_device_context
{
45 /* point back to our device context */
46 struct hv_device
*device_ctx
;
47 struct delayed_work dwork
;
48 struct work_struct work
;
51 #define RING_SIZE_MIN 64
52 static int ring_size
= 128;
53 module_param(ring_size
, int, S_IRUGO
);
54 MODULE_PARM_DESC(ring_size
, "Ring buffer size (# of pages)");
56 static void do_set_multicast(struct work_struct
*w
)
58 struct net_device_context
*ndevctx
=
59 container_of(w
, struct net_device_context
, work
);
60 struct netvsc_device
*nvdev
;
61 struct rndis_device
*rdev
;
63 nvdev
= hv_get_drvdata(ndevctx
->device_ctx
);
64 if (nvdev
== NULL
|| nvdev
->ndev
== NULL
)
67 rdev
= nvdev
->extension
;
71 if (nvdev
->ndev
->flags
& IFF_PROMISC
)
72 rndis_filter_set_packet_filter(rdev
,
73 NDIS_PACKET_TYPE_PROMISCUOUS
);
75 rndis_filter_set_packet_filter(rdev
,
76 NDIS_PACKET_TYPE_BROADCAST
|
77 NDIS_PACKET_TYPE_ALL_MULTICAST
|
78 NDIS_PACKET_TYPE_DIRECTED
);
81 static void netvsc_set_multicast_list(struct net_device
*net
)
83 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
85 schedule_work(&net_device_ctx
->work
);
88 static int netvsc_open(struct net_device
*net
)
90 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
91 struct hv_device
*device_obj
= net_device_ctx
->device_ctx
;
94 /* Open up the device */
95 ret
= rndis_filter_open(device_obj
);
97 netdev_err(net
, "unable to open device (ret %d).\n", ret
);
101 netif_start_queue(net
);
106 static int netvsc_close(struct net_device
*net
)
108 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
109 struct hv_device
*device_obj
= net_device_ctx
->device_ctx
;
112 netif_tx_disable(net
);
114 /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
115 cancel_work_sync(&net_device_ctx
->work
);
116 ret
= rndis_filter_close(device_obj
);
118 netdev_err(net
, "unable to close device (ret %d).\n", ret
);
123 static void netvsc_xmit_completion(void *context
)
125 struct hv_netvsc_packet
*packet
= (struct hv_netvsc_packet
*)context
;
126 struct sk_buff
*skb
= (struct sk_buff
*)
127 (unsigned long)packet
->completion
.send
.send_completion_tid
;
132 dev_kfree_skb_any(skb
);
135 static int netvsc_start_xmit(struct sk_buff
*skb
, struct net_device
*net
)
137 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
138 struct hv_netvsc_packet
*packet
;
140 unsigned int i
, num_pages
, npg_data
;
142 /* Add multipages for skb->data and additional 2 for RNDIS */
143 npg_data
= (((unsigned long)skb
->data
+ skb_headlen(skb
) - 1)
144 >> PAGE_SHIFT
) - ((unsigned long)skb
->data
>> PAGE_SHIFT
) + 1;
145 num_pages
= skb_shinfo(skb
)->nr_frags
+ npg_data
+ 2;
147 /* Allocate a netvsc packet based on # of frags. */
148 packet
= kzalloc(sizeof(struct hv_netvsc_packet
) +
149 (num_pages
* sizeof(struct hv_page_buffer
)) +
150 sizeof(struct rndis_filter_packet
) +
151 NDIS_VLAN_PPI_SIZE
, GFP_ATOMIC
);
153 /* out of memory, drop packet */
154 netdev_err(net
, "unable to allocate hv_netvsc_packet\n");
157 net
->stats
.tx_dropped
++;
161 packet
->vlan_tci
= skb
->vlan_tci
;
163 packet
->extension
= (void *)(unsigned long)packet
+
164 sizeof(struct hv_netvsc_packet
) +
165 (num_pages
* sizeof(struct hv_page_buffer
));
167 /* If the rndis msg goes beyond 1 page, we will add 1 later */
168 packet
->page_buf_cnt
= num_pages
- 1;
170 /* Initialize it from the skb */
171 packet
->total_data_buflen
= skb
->len
;
173 /* Start filling in the page buffers starting after RNDIS buffer. */
174 packet
->page_buf
[1].pfn
= virt_to_phys(skb
->data
) >> PAGE_SHIFT
;
175 packet
->page_buf
[1].offset
176 = (unsigned long)skb
->data
& (PAGE_SIZE
- 1);
178 packet
->page_buf
[1].len
= skb_headlen(skb
);
180 packet
->page_buf
[1].len
= PAGE_SIZE
181 - packet
->page_buf
[1].offset
;
183 for (i
= 2; i
<= npg_data
; i
++) {
184 packet
->page_buf
[i
].pfn
= virt_to_phys(skb
->data
185 + PAGE_SIZE
* (i
-1)) >> PAGE_SHIFT
;
186 packet
->page_buf
[i
].offset
= 0;
187 packet
->page_buf
[i
].len
= PAGE_SIZE
;
190 packet
->page_buf
[npg_data
].len
= (((unsigned long)skb
->data
191 + skb_headlen(skb
) - 1) & (PAGE_SIZE
- 1)) + 1;
193 /* Additional fragments are after SKB data */
194 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
195 const skb_frag_t
*f
= &skb_shinfo(skb
)->frags
[i
];
197 packet
->page_buf
[i
+npg_data
+1].pfn
=
198 page_to_pfn(skb_frag_page(f
));
199 packet
->page_buf
[i
+npg_data
+1].offset
= f
->page_offset
;
200 packet
->page_buf
[i
+npg_data
+1].len
= skb_frag_size(f
);
203 /* Set the completion routine */
204 packet
->completion
.send
.send_completion
= netvsc_xmit_completion
;
205 packet
->completion
.send
.send_completion_ctx
= packet
;
206 packet
->completion
.send
.send_completion_tid
= (unsigned long)skb
;
208 ret
= rndis_filter_send(net_device_ctx
->device_ctx
,
211 net
->stats
.tx_bytes
+= skb
->len
;
212 net
->stats
.tx_packets
++;
215 if (ret
!= -EAGAIN
) {
216 dev_kfree_skb_any(skb
);
217 net
->stats
.tx_dropped
++;
221 return (ret
== -EAGAIN
) ? NETDEV_TX_BUSY
: NETDEV_TX_OK
;
225 * netvsc_linkstatus_callback - Link up/down notification
227 void netvsc_linkstatus_callback(struct hv_device
*device_obj
,
230 struct net_device
*net
;
231 struct net_device_context
*ndev_ctx
;
232 struct netvsc_device
*net_device
;
234 net_device
= hv_get_drvdata(device_obj
);
235 net
= net_device
->ndev
;
238 netdev_err(net
, "got link status but net device "
239 "not initialized yet\n");
244 netif_carrier_on(net
);
245 ndev_ctx
= netdev_priv(net
);
246 schedule_delayed_work(&ndev_ctx
->dwork
, 0);
247 schedule_delayed_work(&ndev_ctx
->dwork
, msecs_to_jiffies(20));
249 netif_carrier_off(net
);
254 * netvsc_recv_callback - Callback when we receive a packet from the
255 * "wire" on the specified device.
257 int netvsc_recv_callback(struct hv_device
*device_obj
,
258 struct hv_netvsc_packet
*packet
)
260 struct net_device
*net
;
263 net
= ((struct netvsc_device
*)hv_get_drvdata(device_obj
))->ndev
;
265 netdev_err(net
, "got receive callback but net device"
266 " not initialized yet\n");
267 packet
->status
= NVSP_STAT_FAIL
;
271 /* Allocate a skb - TODO direct I/O to pages? */
272 skb
= netdev_alloc_skb_ip_align(net
, packet
->total_data_buflen
);
273 if (unlikely(!skb
)) {
274 ++net
->stats
.rx_dropped
;
275 packet
->status
= NVSP_STAT_FAIL
;
280 * Copy to skb. This copy is needed here since the memory pointed by
281 * hv_netvsc_packet cannot be deallocated
283 memcpy(skb_put(skb
, packet
->total_data_buflen
), packet
->data
,
284 packet
->total_data_buflen
);
286 skb
->protocol
= eth_type_trans(skb
, net
);
287 skb
->ip_summed
= CHECKSUM_NONE
;
288 if (packet
->vlan_tci
& VLAN_TAG_PRESENT
)
289 __vlan_hwaccel_put_tag(skb
, htons(ETH_P_8021Q
),
292 net
->stats
.rx_packets
++;
293 net
->stats
.rx_bytes
+= packet
->total_data_buflen
;
296 * Pass the skb back up. Network stack will deallocate the skb when it
305 static void netvsc_get_drvinfo(struct net_device
*net
,
306 struct ethtool_drvinfo
*info
)
308 strlcpy(info
->driver
, KBUILD_MODNAME
, sizeof(info
->driver
));
309 strlcpy(info
->fw_version
, "N/A", sizeof(info
->fw_version
));
312 static int netvsc_change_mtu(struct net_device
*ndev
, int mtu
)
314 struct net_device_context
*ndevctx
= netdev_priv(ndev
);
315 struct hv_device
*hdev
= ndevctx
->device_ctx
;
316 struct netvsc_device
*nvdev
= hv_get_drvdata(hdev
);
317 struct netvsc_device_info device_info
;
318 int limit
= ETH_DATA_LEN
;
320 if (nvdev
== NULL
|| nvdev
->destroy
)
323 if (nvdev
->nvsp_version
== NVSP_PROTOCOL_VERSION_2
)
326 if (mtu
< 68 || mtu
> limit
)
329 nvdev
->start_remove
= true;
330 cancel_work_sync(&ndevctx
->work
);
331 netif_tx_disable(ndev
);
332 rndis_filter_device_remove(hdev
);
336 ndevctx
->device_ctx
= hdev
;
337 hv_set_drvdata(hdev
, ndev
);
338 device_info
.ring_size
= ring_size
;
339 rndis_filter_device_add(hdev
, &device_info
);
340 netif_wake_queue(ndev
);
346 static int netvsc_set_mac_addr(struct net_device
*ndev
, void *p
)
348 struct net_device_context
*ndevctx
= netdev_priv(ndev
);
349 struct hv_device
*hdev
= ndevctx
->device_ctx
;
350 struct sockaddr
*addr
= p
;
351 char save_adr
[ETH_ALEN
];
352 unsigned char save_aatype
;
355 memcpy(save_adr
, ndev
->dev_addr
, ETH_ALEN
);
356 save_aatype
= ndev
->addr_assign_type
;
358 err
= eth_mac_addr(ndev
, p
);
362 err
= rndis_filter_set_device_mac(hdev
, addr
->sa_data
);
364 /* roll back to saved MAC */
365 memcpy(ndev
->dev_addr
, save_adr
, ETH_ALEN
);
366 ndev
->addr_assign_type
= save_aatype
;
373 static const struct ethtool_ops ethtool_ops
= {
374 .get_drvinfo
= netvsc_get_drvinfo
,
375 .get_link
= ethtool_op_get_link
,
378 static const struct net_device_ops device_ops
= {
379 .ndo_open
= netvsc_open
,
380 .ndo_stop
= netvsc_close
,
381 .ndo_start_xmit
= netvsc_start_xmit
,
382 .ndo_set_rx_mode
= netvsc_set_multicast_list
,
383 .ndo_change_mtu
= netvsc_change_mtu
,
384 .ndo_validate_addr
= eth_validate_addr
,
385 .ndo_set_mac_address
= netvsc_set_mac_addr
,
389 * Send GARP packet to network peers after migrations.
390 * After Quick Migration, the network is not immediately operational in the
391 * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
392 * another netif_notify_peers() into a delayed work, otherwise GARP packet
393 * will not be sent after quick migration, and cause network disconnection.
395 static void netvsc_send_garp(struct work_struct
*w
)
397 struct net_device_context
*ndev_ctx
;
398 struct net_device
*net
;
399 struct netvsc_device
*net_device
;
401 ndev_ctx
= container_of(w
, struct net_device_context
, dwork
.work
);
402 net_device
= hv_get_drvdata(ndev_ctx
->device_ctx
);
403 net
= net_device
->ndev
;
404 netdev_notify_peers(net
);
408 static int netvsc_probe(struct hv_device
*dev
,
409 const struct hv_vmbus_device_id
*dev_id
)
411 struct net_device
*net
= NULL
;
412 struct net_device_context
*net_device_ctx
;
413 struct netvsc_device_info device_info
;
416 net
= alloc_etherdev(sizeof(struct net_device_context
));
420 /* Set initial state */
421 netif_carrier_off(net
);
423 net_device_ctx
= netdev_priv(net
);
424 net_device_ctx
->device_ctx
= dev
;
425 hv_set_drvdata(dev
, net
);
426 INIT_DELAYED_WORK(&net_device_ctx
->dwork
, netvsc_send_garp
);
427 INIT_WORK(&net_device_ctx
->work
, do_set_multicast
);
429 net
->netdev_ops
= &device_ops
;
431 /* TODO: Add GSO and Checksum offload */
432 net
->hw_features
= 0;
433 net
->features
= NETIF_F_HW_VLAN_CTAG_TX
;
435 SET_ETHTOOL_OPS(net
, ðtool_ops
);
436 SET_NETDEV_DEV(net
, &dev
->device
);
438 ret
= register_netdev(net
);
440 pr_err("Unable to register netdev.\n");
445 /* Notify the netvsc driver of the new device */
446 device_info
.ring_size
= ring_size
;
447 ret
= rndis_filter_device_add(dev
, &device_info
);
449 netdev_err(net
, "unable to add netvsc device (ret %d)\n", ret
);
450 unregister_netdev(net
);
452 hv_set_drvdata(dev
, NULL
);
455 memcpy(net
->dev_addr
, device_info
.mac_adr
, ETH_ALEN
);
457 netif_carrier_on(net
);
463 static int netvsc_remove(struct hv_device
*dev
)
465 struct net_device
*net
;
466 struct net_device_context
*ndev_ctx
;
467 struct netvsc_device
*net_device
;
469 net_device
= hv_get_drvdata(dev
);
470 net
= net_device
->ndev
;
473 dev_err(&dev
->device
, "No net device to remove\n");
477 net_device
->start_remove
= true;
479 ndev_ctx
= netdev_priv(net
);
480 cancel_delayed_work_sync(&ndev_ctx
->dwork
);
481 cancel_work_sync(&ndev_ctx
->work
);
483 /* Stop outbound asap */
484 netif_tx_disable(net
);
486 unregister_netdev(net
);
489 * Call to the vsc driver to let it know that the device is being
492 rndis_filter_device_remove(dev
);
498 static const struct hv_vmbus_device_id id_table
[] = {
504 MODULE_DEVICE_TABLE(vmbus
, id_table
);
506 /* The one and only one */
507 static struct hv_driver netvsc_drv
= {
508 .name
= KBUILD_MODNAME
,
509 .id_table
= id_table
,
510 .probe
= netvsc_probe
,
511 .remove
= netvsc_remove
,
514 static void __exit
netvsc_drv_exit(void)
516 vmbus_driver_unregister(&netvsc_drv
);
519 static int __init
netvsc_drv_init(void)
521 if (ring_size
< RING_SIZE_MIN
) {
522 ring_size
= RING_SIZE_MIN
;
523 pr_info("Increased ring_size to %d (min allowed)\n",
526 return vmbus_driver_register(&netvsc_drv
);
529 MODULE_LICENSE("GPL");
530 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
532 module_init(netvsc_drv_init
);
533 module_exit(netvsc_drv_exit
);