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