hexagon: add missing cpu.h include
[~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 };
48
49
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)");
53
54 struct set_multicast_work {
55         struct work_struct work;
56         struct net_device *net;
57 };
58
59 static 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)
71                 goto out;
72
73         rdev = nvdev->extension;
74         if (rdev == NULL)
75                 goto out;
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
86 out:
87         kfree(w);
88 }
89
90 static void netvsc_set_multicast_list(struct net_device *net)
91 {
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);
100 }
101
102 static int netvsc_open(struct net_device *net)
103 {
104         struct net_device_context *net_device_ctx = netdev_priv(net);
105         struct hv_device *device_obj = net_device_ctx->device_ctx;
106         int ret = 0;
107
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;
113         }
114
115         netif_start_queue(net);
116
117         return ret;
118 }
119
120 static int netvsc_close(struct net_device *net)
121 {
122         struct net_device_context *net_device_ctx = netdev_priv(net);
123         struct hv_device *device_obj = net_device_ctx->device_ctx;
124         int ret;
125
126         netif_tx_disable(net);
127
128         ret = rndis_filter_close(device_obj);
129         if (ret != 0)
130                 netdev_err(net, "unable to close device (ret %d).\n", ret);
131
132         return ret;
133 }
134
135 static void netvsc_xmit_completion(void *context)
136 {
137         struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
138         struct sk_buff *skb = (struct sk_buff *)
139                 (unsigned long)packet->completion.send.send_completion_tid;
140
141         kfree(packet);
142
143         if (skb)
144                 dev_kfree_skb_any(skb);
145 }
146
147 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
148 {
149         struct net_device_context *net_device_ctx = netdev_priv(net);
150         struct hv_netvsc_packet *packet;
151         int ret;
152         unsigned int i, num_pages, npg_data;
153
154         /* Add multipages for skb->data and additional 2 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 + 2;
158
159         /* Allocate a netvsc packet based on # of frags. */
160         packet = kzalloc(sizeof(struct hv_netvsc_packet) +
161                          (num_pages * sizeof(struct hv_page_buffer)) +
162                          sizeof(struct rndis_filter_packet) +
163                          NDIS_VLAN_PPI_SIZE, GFP_ATOMIC);
164         if (!packet) {
165                 /* out of memory, drop packet */
166                 netdev_err(net, "unable to allocate hv_netvsc_packet\n");
167
168                 dev_kfree_skb(skb);
169                 net->stats.tx_dropped++;
170                 return NETDEV_TX_OK;
171         }
172
173         packet->vlan_tci = skb->vlan_tci;
174
175         packet->extension = (void *)(unsigned long)packet +
176                                 sizeof(struct hv_netvsc_packet) +
177                                     (num_pages * sizeof(struct hv_page_buffer));
178
179         /* If the rndis msg goes beyond 1 page, we will add 1 later */
180         packet->page_buf_cnt = num_pages - 1;
181
182         /* Initialize it from the skb */
183         packet->total_data_buflen = skb->len;
184
185         /* Start filling in the page buffers starting after RNDIS buffer. */
186         packet->page_buf[1].pfn = virt_to_phys(skb->data) >> PAGE_SHIFT;
187         packet->page_buf[1].offset
188                 = (unsigned long)skb->data & (PAGE_SIZE - 1);
189         if (npg_data == 1)
190                 packet->page_buf[1].len = skb_headlen(skb);
191         else
192                 packet->page_buf[1].len = PAGE_SIZE
193                         - packet->page_buf[1].offset;
194
195         for (i = 2; i <= npg_data; i++) {
196                 packet->page_buf[i].pfn = virt_to_phys(skb->data
197                         + PAGE_SIZE * (i-1)) >> PAGE_SHIFT;
198                 packet->page_buf[i].offset = 0;
199                 packet->page_buf[i].len = PAGE_SIZE;
200         }
201         if (npg_data > 1)
202                 packet->page_buf[npg_data].len = (((unsigned long)skb->data
203                         + skb_headlen(skb) - 1) & (PAGE_SIZE - 1)) + 1;
204
205         /* Additional fragments are after SKB data */
206         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
207                 const skb_frag_t *f = &skb_shinfo(skb)->frags[i];
208
209                 packet->page_buf[i+npg_data+1].pfn =
210                         page_to_pfn(skb_frag_page(f));
211                 packet->page_buf[i+npg_data+1].offset = f->page_offset;
212                 packet->page_buf[i+npg_data+1].len = skb_frag_size(f);
213         }
214
215         /* Set the completion routine */
216         packet->completion.send.send_completion = netvsc_xmit_completion;
217         packet->completion.send.send_completion_ctx = packet;
218         packet->completion.send.send_completion_tid = (unsigned long)skb;
219
220         ret = rndis_filter_send(net_device_ctx->device_ctx,
221                                   packet);
222         if (ret == 0) {
223                 net->stats.tx_bytes += skb->len;
224                 net->stats.tx_packets++;
225         } else {
226                 kfree(packet);
227         }
228
229         return ret ? NETDEV_TX_BUSY : NETDEV_TX_OK;
230 }
231
232 /*
233  * netvsc_linkstatus_callback - Link up/down notification
234  */
235 void netvsc_linkstatus_callback(struct hv_device *device_obj,
236                                        unsigned int status)
237 {
238         struct net_device *net;
239         struct net_device_context *ndev_ctx;
240         struct netvsc_device *net_device;
241
242         net_device = hv_get_drvdata(device_obj);
243         net = net_device->ndev;
244
245         if (!net) {
246                 netdev_err(net, "got link status but net device "
247                                 "not initialized yet\n");
248                 return;
249         }
250
251         if (status == 1) {
252                 netif_carrier_on(net);
253                 netif_wake_queue(net);
254                 ndev_ctx = netdev_priv(net);
255                 schedule_delayed_work(&ndev_ctx->dwork, 0);
256                 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
257         } else {
258                 netif_carrier_off(net);
259                 netif_tx_disable(net);
260         }
261 }
262
263 /*
264  * netvsc_recv_callback -  Callback when we receive a packet from the
265  * "wire" on the specified device.
266  */
267 int netvsc_recv_callback(struct hv_device *device_obj,
268                                 struct hv_netvsc_packet *packet)
269 {
270         struct net_device *net;
271         struct sk_buff *skb;
272
273         net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev;
274         if (!net) {
275                 netdev_err(net, "got receive callback but net device"
276                         " not initialized yet\n");
277                 return 0;
278         }
279
280         /* Allocate a skb - TODO direct I/O to pages? */
281         skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
282         if (unlikely(!skb)) {
283                 ++net->stats.rx_dropped;
284                 return 0;
285         }
286
287         /*
288          * Copy to skb. This copy is needed here since the memory pointed by
289          * hv_netvsc_packet cannot be deallocated
290          */
291         memcpy(skb_put(skb, packet->total_data_buflen), packet->data,
292                 packet->total_data_buflen);
293
294         skb->protocol = eth_type_trans(skb, net);
295         skb->ip_summed = CHECKSUM_NONE;
296         skb->vlan_tci = packet->vlan_tci;
297
298         net->stats.rx_packets++;
299         net->stats.rx_bytes += packet->total_data_buflen;
300
301         /*
302          * Pass the skb back up. Network stack will deallocate the skb when it
303          * is done.
304          * TODO - use NAPI?
305          */
306         netif_rx(skb);
307
308         return 0;
309 }
310
311 static void netvsc_get_drvinfo(struct net_device *net,
312                                struct ethtool_drvinfo *info)
313 {
314         strcpy(info->driver, KBUILD_MODNAME);
315         strcpy(info->version, HV_DRV_VERSION);
316         strcpy(info->fw_version, "N/A");
317 }
318
319 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
320 {
321         struct net_device_context *ndevctx = netdev_priv(ndev);
322         struct hv_device *hdev =  ndevctx->device_ctx;
323         struct netvsc_device *nvdev = hv_get_drvdata(hdev);
324         struct netvsc_device_info device_info;
325         int limit = ETH_DATA_LEN;
326
327         if (nvdev == NULL || nvdev->destroy)
328                 return -ENODEV;
329
330         if (nvdev->nvsp_version == NVSP_PROTOCOL_VERSION_2)
331                 limit = NETVSC_MTU;
332
333         if (mtu < 68 || mtu > limit)
334                 return -EINVAL;
335
336         nvdev->start_remove = true;
337         cancel_delayed_work_sync(&ndevctx->dwork);
338         netif_tx_disable(ndev);
339         rndis_filter_device_remove(hdev);
340
341         ndev->mtu = mtu;
342
343         ndevctx->device_ctx = hdev;
344         hv_set_drvdata(hdev, ndev);
345         device_info.ring_size = ring_size;
346         rndis_filter_device_add(hdev, &device_info);
347         netif_wake_queue(ndev);
348
349         return 0;
350 }
351
352 static const struct ethtool_ops ethtool_ops = {
353         .get_drvinfo    = netvsc_get_drvinfo,
354         .get_link       = ethtool_op_get_link,
355 };
356
357 static const struct net_device_ops device_ops = {
358         .ndo_open =                     netvsc_open,
359         .ndo_stop =                     netvsc_close,
360         .ndo_start_xmit =               netvsc_start_xmit,
361         .ndo_set_rx_mode =              netvsc_set_multicast_list,
362         .ndo_change_mtu =               netvsc_change_mtu,
363         .ndo_validate_addr =            eth_validate_addr,
364         .ndo_set_mac_address =          eth_mac_addr,
365 };
366
367 /*
368  * Send GARP packet to network peers after migrations.
369  * After Quick Migration, the network is not immediately operational in the
370  * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
371  * another netif_notify_peers() into a delayed work, otherwise GARP packet
372  * will not be sent after quick migration, and cause network disconnection.
373  */
374 static void netvsc_send_garp(struct work_struct *w)
375 {
376         struct net_device_context *ndev_ctx;
377         struct net_device *net;
378         struct netvsc_device *net_device;
379
380         ndev_ctx = container_of(w, struct net_device_context, dwork.work);
381         net_device = hv_get_drvdata(ndev_ctx->device_ctx);
382         net = net_device->ndev;
383         netif_notify_peers(net);
384 }
385
386
387 static int netvsc_probe(struct hv_device *dev,
388                         const struct hv_vmbus_device_id *dev_id)
389 {
390         struct net_device *net = NULL;
391         struct net_device_context *net_device_ctx;
392         struct netvsc_device_info device_info;
393         int ret;
394
395         net = alloc_etherdev(sizeof(struct net_device_context));
396         if (!net)
397                 return -ENOMEM;
398
399         /* Set initial state */
400         netif_carrier_off(net);
401
402         net_device_ctx = netdev_priv(net);
403         net_device_ctx->device_ctx = dev;
404         hv_set_drvdata(dev, net);
405         INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp);
406
407         net->netdev_ops = &device_ops;
408
409         /* TODO: Add GSO and Checksum offload */
410         net->hw_features = NETIF_F_SG;
411         net->features = NETIF_F_SG | NETIF_F_HW_VLAN_TX;
412
413         SET_ETHTOOL_OPS(net, &ethtool_ops);
414         SET_NETDEV_DEV(net, &dev->device);
415
416         ret = register_netdev(net);
417         if (ret != 0) {
418                 pr_err("Unable to register netdev.\n");
419                 free_netdev(net);
420                 goto out;
421         }
422
423         /* Notify the netvsc driver of the new device */
424         device_info.ring_size = ring_size;
425         ret = rndis_filter_device_add(dev, &device_info);
426         if (ret != 0) {
427                 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
428                 unregister_netdev(net);
429                 free_netdev(net);
430                 hv_set_drvdata(dev, NULL);
431                 return ret;
432         }
433         memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
434
435         netif_carrier_on(net);
436
437 out:
438         return ret;
439 }
440
441 static int netvsc_remove(struct hv_device *dev)
442 {
443         struct net_device *net;
444         struct net_device_context *ndev_ctx;
445         struct netvsc_device *net_device;
446
447         net_device = hv_get_drvdata(dev);
448         net = net_device->ndev;
449
450         if (net == NULL) {
451                 dev_err(&dev->device, "No net device to remove\n");
452                 return 0;
453         }
454
455         net_device->start_remove = true;
456
457         ndev_ctx = netdev_priv(net);
458         cancel_delayed_work_sync(&ndev_ctx->dwork);
459
460         /* Stop outbound asap */
461         netif_tx_disable(net);
462
463         unregister_netdev(net);
464
465         /*
466          * Call to the vsc driver to let it know that the device is being
467          * removed
468          */
469         rndis_filter_device_remove(dev);
470
471         free_netdev(net);
472         return 0;
473 }
474
475 static const struct hv_vmbus_device_id id_table[] = {
476         /* Network guid */
477         { VMBUS_DEVICE(0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
478                        0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E) },
479         { },
480 };
481
482 MODULE_DEVICE_TABLE(vmbus, id_table);
483
484 /* The one and only one */
485 static struct  hv_driver netvsc_drv = {
486         .name = KBUILD_MODNAME,
487         .id_table = id_table,
488         .probe = netvsc_probe,
489         .remove = netvsc_remove,
490 };
491
492 static void __exit netvsc_drv_exit(void)
493 {
494         vmbus_driver_unregister(&netvsc_drv);
495 }
496
497 static int __init netvsc_drv_init(void)
498 {
499         return vmbus_driver_register(&netvsc_drv);
500 }
501
502 MODULE_LICENSE("GPL");
503 MODULE_VERSION(HV_DRV_VERSION);
504 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
505
506 module_init(netvsc_drv_init);
507 module_exit(netvsc_drv_exit);