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fceaf24a 1/*
fceaf24a
HJ
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
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.
7 *
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
11 * more details.
12 *
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.
16 *
17 * Authors:
d0e94d17 18 * Haiyang Zhang <haiyangz@microsoft.com>
fceaf24a 19 * Hank Janssen <hjanssen@microsoft.com>
fceaf24a 20 */
eb335bc4
HJ
21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
fceaf24a 23#include <linux/init.h>
9079ce69 24#include <linux/atomic.h>
fceaf24a
HJ
25#include <linux/module.h>
26#include <linux/highmem.h>
27#include <linux/device.h>
fceaf24a 28#include <linux/io.h>
fceaf24a
HJ
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/in.h>
5a0e3ad6 35#include <linux/slab.h>
fceaf24a
HJ
36#include <net/arp.h>
37#include <net/route.h>
38#include <net/sock.h>
39#include <net/pkt_sched.h>
3f335ea2 40
5ca7252a 41#include "hyperv_net.h"
fceaf24a 42
fceaf24a 43struct net_device_context {
02fafbc6 44 /* point back to our device context */
6bad88da 45 struct hv_device *device_ctx;
122a5f64 46 struct delayed_work dwork;
fceaf24a
HJ
47};
48
fceaf24a 49
99c8da0f 50static int ring_size = 128;
450d7a4b
SH
51module_param(ring_size, int, S_IRUGO);
52MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
fceaf24a 53
d426b2e3
HZ
54struct set_multicast_work {
55 struct work_struct work;
56 struct net_device *net;
57};
58
59static void do_set_multicast(struct work_struct *w)
60{
61 struct set_multicast_work *swk =
62 container_of(w, struct set_multicast_work, work);
63 struct net_device *net = swk->net;
64
65 struct net_device_context *ndevctx = netdev_priv(net);
66 struct netvsc_device *nvdev;
67 struct rndis_device *rdev;
68
69 nvdev = hv_get_drvdata(ndevctx->device_ctx);
70 if (nvdev == NULL)
c11bf1c8 71 goto out;
d426b2e3
HZ
72
73 rdev = nvdev->extension;
74 if (rdev == NULL)
c11bf1c8 75 goto out;
d426b2e3
HZ
76
77 if (net->flags & IFF_PROMISC)
78 rndis_filter_set_packet_filter(rdev,
79 NDIS_PACKET_TYPE_PROMISCUOUS);
80 else
81 rndis_filter_set_packet_filter(rdev,
82 NDIS_PACKET_TYPE_BROADCAST |
83 NDIS_PACKET_TYPE_ALL_MULTICAST |
84 NDIS_PACKET_TYPE_DIRECTED);
85
c11bf1c8 86out:
d426b2e3
HZ
87 kfree(w);
88}
89
4e9bfefa 90static void netvsc_set_multicast_list(struct net_device *net)
fceaf24a 91{
d426b2e3
HZ
92 struct set_multicast_work *swk =
93 kmalloc(sizeof(struct set_multicast_work), GFP_ATOMIC);
94 if (swk == NULL)
95 return;
96
97 swk->net = net;
98 INIT_WORK(&swk->work, do_set_multicast);
99 schedule_work(&swk->work);
fceaf24a
HJ
100}
101
fceaf24a
HJ
102static int netvsc_open(struct net_device *net)
103{
fceaf24a 104 struct net_device_context *net_device_ctx = netdev_priv(net);
6bad88da 105 struct hv_device *device_obj = net_device_ctx->device_ctx;
02fafbc6 106 int ret = 0;
fceaf24a 107
d515d0ff
HZ
108 /* Open up the device */
109 ret = rndis_filter_open(device_obj);
110 if (ret != 0) {
111 netdev_err(net, "unable to open device (ret %d).\n", ret);
112 return ret;
fceaf24a
HJ
113 }
114
d515d0ff
HZ
115 netif_start_queue(net);
116
fceaf24a
HJ
117 return ret;
118}
119
fceaf24a
HJ
120static int netvsc_close(struct net_device *net)
121{
fceaf24a 122 struct net_device_context *net_device_ctx = netdev_priv(net);
6bad88da 123 struct hv_device *device_obj = net_device_ctx->device_ctx;
02fafbc6 124 int ret;
fceaf24a 125
fceaf24a
HJ
126 netif_stop_queue(net);
127
9c26aa0d 128 ret = rndis_filter_close(device_obj);
fceaf24a 129 if (ret != 0)
eb335bc4 130 netdev_err(net, "unable to close device (ret %d).\n", ret);
fceaf24a 131
fceaf24a
HJ
132 return ret;
133}
134
fceaf24a
HJ
135static void netvsc_xmit_completion(void *context)
136{
4193d4f4 137 struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
02fafbc6 138 struct sk_buff *skb = (struct sk_buff *)
72a2f5bd 139 (unsigned long)packet->completion.send.send_completion_tid;
fceaf24a 140
fceaf24a
HJ
141 kfree(packet);
142
1d06825b 143 if (skb)
b220f5f9 144 dev_kfree_skb_any(skb);
fceaf24a
HJ
145}
146
02fafbc6 147static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
fceaf24a 148{
fceaf24a 149 struct net_device_context *net_device_ctx = netdev_priv(net);
4193d4f4 150 struct hv_netvsc_packet *packet;
02fafbc6 151 int ret;
4d447c9a 152 unsigned int i, num_pages, npg_data;
fceaf24a 153
4d447c9a
HZ
154 /* Add multipage for skb->data and additional one for RNDIS */
155 npg_data = (((unsigned long)skb->data + skb_headlen(skb) - 1)
156 >> PAGE_SHIFT) - ((unsigned long)skb->data >> PAGE_SHIFT) + 1;
157 num_pages = skb_shinfo(skb)->nr_frags + npg_data + 1;
fceaf24a 158
454f18a9 159 /* Allocate a netvsc packet based on # of frags. */
02fafbc6 160 packet = kzalloc(sizeof(struct hv_netvsc_packet) +
6048718d 161 (num_pages * sizeof(struct hv_page_buffer)) +
f8ba8c70 162 sizeof(struct rndis_filter_packet), GFP_ATOMIC);
02fafbc6 163 if (!packet) {
bf769375 164 /* out of memory, drop packet */
eb335bc4 165 netdev_err(net, "unable to allocate hv_netvsc_packet\n");
b220f5f9
SH
166
167 dev_kfree_skb(skb);
168 net->stats.tx_dropped++;
bf769375 169 return NETDEV_TX_BUSY;
fceaf24a
HJ
170 }
171
72a2f5bd 172 packet->extension = (void *)(unsigned long)packet +
02fafbc6 173 sizeof(struct hv_netvsc_packet) +
6048718d 174 (num_pages * sizeof(struct hv_page_buffer));
fceaf24a 175
454f18a9 176 /* Setup the rndis header */
72a2f5bd 177 packet->page_buf_cnt = num_pages;
fceaf24a 178
454f18a9 179 /* Initialize it from the skb */
4d447c9a 180 packet->total_data_buflen = skb->len;
fceaf24a 181
6048718d 182 /* Start filling in the page buffers starting after RNDIS buffer. */
ca623ad3
HZ
183 packet->page_buf[1].pfn = virt_to_phys(skb->data) >> PAGE_SHIFT;
184 packet->page_buf[1].offset
6048718d 185 = (unsigned long)skb->data & (PAGE_SIZE - 1);
4d447c9a
HZ
186 if (npg_data == 1)
187 packet->page_buf[1].len = skb_headlen(skb);
188 else
189 packet->page_buf[1].len = PAGE_SIZE
190 - packet->page_buf[1].offset;
191
192 for (i = 2; i <= npg_data; i++) {
193 packet->page_buf[i].pfn = virt_to_phys(skb->data
194 + PAGE_SIZE * (i-1)) >> PAGE_SHIFT;
195 packet->page_buf[i].offset = 0;
196 packet->page_buf[i].len = PAGE_SIZE;
197 }
198 if (npg_data > 1)
199 packet->page_buf[npg_data].len = (((unsigned long)skb->data
200 + skb_headlen(skb) - 1) & (PAGE_SIZE - 1)) + 1;
6048718d
SH
201
202 /* Additional fragments are after SKB data */
203 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
9e903e08 204 const skb_frag_t *f = &skb_shinfo(skb)->frags[i];
6048718d 205
4d447c9a
HZ
206 packet->page_buf[i+npg_data+1].pfn =
207 page_to_pfn(skb_frag_page(f));
208 packet->page_buf[i+npg_data+1].offset = f->page_offset;
209 packet->page_buf[i+npg_data+1].len = skb_frag_size(f);
fceaf24a
HJ
210 }
211
454f18a9 212 /* Set the completion routine */
72a2f5bd
HZ
213 packet->completion.send.send_completion = netvsc_xmit_completion;
214 packet->completion.send.send_completion_ctx = packet;
215 packet->completion.send.send_completion_tid = (unsigned long)skb;
fceaf24a 216
55acb696 217 ret = rndis_filter_send(net_device_ctx->device_ctx,
02fafbc6 218 packet);
02fafbc6 219 if (ret == 0) {
b852fdce
SH
220 net->stats.tx_bytes += skb->len;
221 net->stats.tx_packets++;
b220f5f9
SH
222 } else {
223 /* we are shutting down or bus overloaded, just drop packet */
b852fdce 224 net->stats.tx_dropped++;
8a5f9edc
HZ
225 kfree(packet);
226 dev_kfree_skb_any(skb);
fceaf24a
HJ
227 }
228
bf769375 229 return ret ? NETDEV_TX_BUSY : NETDEV_TX_OK;
fceaf24a
HJ
230}
231
3e189519 232/*
02fafbc6
GKH
233 * netvsc_linkstatus_callback - Link up/down notification
234 */
90ef117a 235void netvsc_linkstatus_callback(struct hv_device *device_obj,
02fafbc6 236 unsigned int status)
fceaf24a 237{
2ddd5e5f 238 struct net_device *net;
c996edcf 239 struct net_device_context *ndev_ctx;
2ddd5e5f
S
240 struct netvsc_device *net_device;
241
242 net_device = hv_get_drvdata(device_obj);
243 net = net_device->ndev;
fceaf24a 244
02fafbc6 245 if (!net) {
eb335bc4
HJ
246 netdev_err(net, "got link status but net device "
247 "not initialized yet\n");
fceaf24a
HJ
248 return;
249 }
250
02fafbc6 251 if (status == 1) {
fceaf24a
HJ
252 netif_carrier_on(net);
253 netif_wake_queue(net);
c996edcf 254 ndev_ctx = netdev_priv(net);
c4b6a2ea 255 schedule_delayed_work(&ndev_ctx->dwork, 0);
122a5f64 256 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
02fafbc6 257 } else {
fceaf24a
HJ
258 netif_carrier_off(net);
259 netif_stop_queue(net);
260 }
fceaf24a
HJ
261}
262
3e189519
HJ
263/*
264 * netvsc_recv_callback - Callback when we receive a packet from the
265 * "wire" on the specified device.
02fafbc6 266 */
f79adf8f 267int netvsc_recv_callback(struct hv_device *device_obj,
02fafbc6 268 struct hv_netvsc_packet *packet)
fceaf24a 269{
6bad88da 270 struct net_device *net = dev_get_drvdata(&device_obj->device);
fceaf24a 271 struct sk_buff *skb;
2ddd5e5f
S
272 struct netvsc_device *net_device;
273
274 net_device = hv_get_drvdata(device_obj);
275 net = net_device->ndev;
fceaf24a 276
02fafbc6 277 if (!net) {
eb335bc4
HJ
278 netdev_err(net, "got receive callback but net device"
279 " not initialized yet\n");
fceaf24a
HJ
280 return 0;
281 }
282
9495c282 283 /* Allocate a skb - TODO direct I/O to pages? */
72a2f5bd 284 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
9495c282
SH
285 if (unlikely(!skb)) {
286 ++net->stats.rx_dropped;
287 return 0;
288 }
fceaf24a 289
02fafbc6
GKH
290 /*
291 * Copy to skb. This copy is needed here since the memory pointed by
292 * hv_netvsc_packet cannot be deallocated
293 */
45326342
HZ
294 memcpy(skb_put(skb, packet->total_data_buflen), packet->data,
295 packet->total_data_buflen);
fceaf24a
HJ
296
297 skb->protocol = eth_type_trans(skb, net);
fceaf24a
HJ
298 skb->ip_summed = CHECKSUM_NONE;
299
9495c282 300 net->stats.rx_packets++;
48c38839 301 net->stats.rx_bytes += packet->total_data_buflen;
9495c282 302
02fafbc6
GKH
303 /*
304 * Pass the skb back up. Network stack will deallocate the skb when it
9495c282
SH
305 * is done.
306 * TODO - use NAPI?
02fafbc6 307 */
9495c282 308 netif_rx(skb);
fceaf24a 309
fceaf24a
HJ
310 return 0;
311}
312
f82f4ad7
SH
313static void netvsc_get_drvinfo(struct net_device *net,
314 struct ethtool_drvinfo *info)
315{
316 strcpy(info->driver, "hv_netvsc");
317 strcpy(info->version, HV_DRV_VERSION);
318 strcpy(info->fw_version, "N/A");
319}
320
4d447c9a
HZ
321static int netvsc_change_mtu(struct net_device *ndev, int mtu)
322{
323 struct net_device_context *ndevctx = netdev_priv(ndev);
324 struct hv_device *hdev = ndevctx->device_ctx;
325 struct netvsc_device *nvdev = hv_get_drvdata(hdev);
326 struct netvsc_device_info device_info;
327 int limit = ETH_DATA_LEN;
328
329 if (nvdev == NULL || nvdev->destroy)
330 return -ENODEV;
331
332 if (nvdev->nvsp_version == NVSP_PROTOCOL_VERSION_2)
333 limit = NETVSC_MTU;
334
335 if (mtu < 68 || mtu > limit)
336 return -EINVAL;
337
338 nvdev->start_remove = true;
339 cancel_delayed_work_sync(&ndevctx->dwork);
340 netif_stop_queue(ndev);
341 rndis_filter_device_remove(hdev);
342
343 ndev->mtu = mtu;
344
345 ndevctx->device_ctx = hdev;
346 hv_set_drvdata(hdev, ndev);
347 device_info.ring_size = ring_size;
348 rndis_filter_device_add(hdev, &device_info);
349 netif_wake_queue(ndev);
350
351 return 0;
352}
353
f82f4ad7
SH
354static const struct ethtool_ops ethtool_ops = {
355 .get_drvinfo = netvsc_get_drvinfo,
f82f4ad7
SH
356 .get_link = ethtool_op_get_link,
357};
358
df2fff28
GKH
359static const struct net_device_ops device_ops = {
360 .ndo_open = netvsc_open,
361 .ndo_stop = netvsc_close,
362 .ndo_start_xmit = netvsc_start_xmit,
afc4b13d 363 .ndo_set_rx_mode = netvsc_set_multicast_list,
4d447c9a 364 .ndo_change_mtu = netvsc_change_mtu,
b681b588
HZ
365 .ndo_validate_addr = eth_validate_addr,
366 .ndo_set_mac_address = eth_mac_addr,
df2fff28
GKH
367};
368
c996edcf
HZ
369/*
370 * Send GARP packet to network peers after migrations.
371 * After Quick Migration, the network is not immediately operational in the
372 * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
122a5f64 373 * another netif_notify_peers() into a delayed work, otherwise GARP packet
c996edcf
HZ
374 * will not be sent after quick migration, and cause network disconnection.
375 */
376static void netvsc_send_garp(struct work_struct *w)
377{
378 struct net_device_context *ndev_ctx;
379 struct net_device *net;
2ddd5e5f 380 struct netvsc_device *net_device;
c996edcf 381
122a5f64 382 ndev_ctx = container_of(w, struct net_device_context, dwork.work);
2ddd5e5f
S
383 net_device = hv_get_drvdata(ndev_ctx->device_ctx);
384 net = net_device->ndev;
c996edcf
HZ
385 netif_notify_peers(net);
386}
387
388
84946899
S
389static int netvsc_probe(struct hv_device *dev,
390 const struct hv_vmbus_device_id *dev_id)
df2fff28 391{
df2fff28
GKH
392 struct net_device *net = NULL;
393 struct net_device_context *net_device_ctx;
394 struct netvsc_device_info device_info;
395 int ret;
396
546d9e10 397 net = alloc_etherdev(sizeof(struct net_device_context));
df2fff28 398 if (!net)
51a805d0 399 return -ENOMEM;
df2fff28
GKH
400
401 /* Set initial state */
402 netif_carrier_off(net);
df2fff28
GKH
403
404 net_device_ctx = netdev_priv(net);
9efd21e1 405 net_device_ctx->device_ctx = dev;
2ddd5e5f 406 hv_set_drvdata(dev, net);
122a5f64 407 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp);
df2fff28 408
df2fff28
GKH
409 net->netdev_ops = &device_ops;
410
6048718d 411 /* TODO: Add GSO and Checksum offload */
877a344b 412 net->hw_features = NETIF_F_SG;
6048718d
SH
413 net->features = NETIF_F_SG;
414
f82f4ad7 415 SET_ETHTOOL_OPS(net, &ethtool_ops);
9efd21e1 416 SET_NETDEV_DEV(net, &dev->device);
df2fff28
GKH
417
418 ret = register_netdev(net);
419 if (ret != 0) {
692e084e 420 pr_err("Unable to register netdev.\n");
df2fff28 421 free_netdev(net);
692e084e 422 goto out;
df2fff28
GKH
423 }
424
692e084e
HZ
425 /* Notify the netvsc driver of the new device */
426 device_info.ring_size = ring_size;
427 ret = rndis_filter_device_add(dev, &device_info);
428 if (ret != 0) {
429 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
430 unregister_netdev(net);
df2fff28 431 free_netdev(net);
2ddd5e5f 432 hv_set_drvdata(dev, NULL);
692e084e 433 return ret;
df2fff28 434 }
692e084e
HZ
435 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
436
437 netif_carrier_on(net);
df2fff28 438
692e084e 439out:
df2fff28
GKH
440 return ret;
441}
442
415b023a 443static int netvsc_remove(struct hv_device *dev)
df2fff28 444{
2ddd5e5f 445 struct net_device *net;
122a5f64 446 struct net_device_context *ndev_ctx;
2ddd5e5f
S
447 struct netvsc_device *net_device;
448
449 net_device = hv_get_drvdata(dev);
450 net = net_device->ndev;
df2fff28 451
df2fff28 452 if (net == NULL) {
415b023a 453 dev_err(&dev->device, "No net device to remove\n");
df2fff28
GKH
454 return 0;
455 }
456
4d447c9a
HZ
457 net_device->start_remove = true;
458
122a5f64
HZ
459 ndev_ctx = netdev_priv(net);
460 cancel_delayed_work_sync(&ndev_ctx->dwork);
461
df2fff28
GKH
462 /* Stop outbound asap */
463 netif_stop_queue(net);
df2fff28
GKH
464
465 unregister_netdev(net);
466
467 /*
468 * Call to the vsc driver to let it know that the device is being
469 * removed
470 */
df06bcff 471 rndis_filter_device_remove(dev);
df2fff28
GKH
472
473 free_netdev(net);
df06bcff 474 return 0;
df2fff28
GKH
475}
476
345c4cc3 477static const struct hv_vmbus_device_id id_table[] = {
c45cf2d4
GKH
478 /* Network guid */
479 { VMBUS_DEVICE(0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
480 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E) },
481 { },
345c4cc3
S
482};
483
484MODULE_DEVICE_TABLE(vmbus, id_table);
485
f1542a66 486/* The one and only one */
fde0ef9b 487static struct hv_driver netvsc_drv = {
768fa219 488 .name = "netvsc",
345c4cc3 489 .id_table = id_table,
fde0ef9b
S
490 .probe = netvsc_probe,
491 .remove = netvsc_remove,
d4890970 492};
f1542a66 493
a9869c94 494static void __exit netvsc_drv_exit(void)
fceaf24a 495{
768fa219 496 vmbus_driver_unregister(&netvsc_drv);
fceaf24a
HJ
497}
498
1fde28cf 499static int __init netvsc_drv_init(void)
df2fff28 500{
768fa219 501 return vmbus_driver_register(&netvsc_drv);
df2fff28
GKH
502}
503
26c14cc1
HJ
504MODULE_LICENSE("GPL");
505MODULE_VERSION(HV_DRV_VERSION);
7880fc54 506MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
fceaf24a 507
1fde28cf 508module_init(netvsc_drv_init);
a9869c94 509module_exit(netvsc_drv_exit);