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 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/highmem.h>
24 #include <linux/device.h>
26 #include <linux/delay.h>
27 #include <linux/netdevice.h>
28 #include <linux/inetdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/skbuff.h>
32 #include <linux/slab.h>
33 #include <linux/dmi.h>
34 #include <linux/pci.h>
36 #include <net/route.h>
38 #include <net/pkt_sched.h>
41 #include "version_info.h"
43 #include "netvsc_api.h"
45 struct net_device_context
{
46 /* point back to our device context */
47 struct vm_device
*device_ctx
;
51 struct netvsc_driver_context
{
52 /* !! These must be the first 2 fields !! */
53 /* Which is a bug FIXME! */
54 struct driver_context drv_ctx
;
55 struct netvsc_driver drv_obj
;
58 #define PACKET_PAGES_LOWATER 8
59 /* Need this many pages to handle worst case fragmented packet */
60 #define PACKET_PAGES_HIWATER (MAX_SKB_FRAGS + 2)
62 static int ring_size
= 128;
63 module_param(ring_size
, int, S_IRUGO
);
64 MODULE_PARM_DESC(ring_size
, "Ring buffer size (# of pages)");
66 /* The one and only one */
67 static struct netvsc_driver_context g_netvsc_drv
;
69 static void netvsc_set_multicast_list(struct net_device
*net
)
73 static int netvsc_open(struct net_device
*net
)
75 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
76 struct hv_device
*device_obj
= &net_device_ctx
->device_ctx
->device_obj
;
79 if (netif_carrier_ok(net
)) {
80 /* Open up the device */
81 ret
= RndisFilterOnOpen(device_obj
);
83 DPRINT_ERR(NETVSC_DRV
,
84 "unable to open device (ret %d).", ret
);
88 netif_start_queue(net
);
90 DPRINT_ERR(NETVSC_DRV
, "unable to open device...link is down.");
96 static int netvsc_close(struct net_device
*net
)
98 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
99 struct hv_device
*device_obj
= &net_device_ctx
->device_ctx
->device_obj
;
102 netif_stop_queue(net
);
104 ret
= RndisFilterOnClose(device_obj
);
106 DPRINT_ERR(NETVSC_DRV
, "unable to close device (ret %d).", ret
);
111 static void netvsc_xmit_completion(void *context
)
113 struct hv_netvsc_packet
*packet
= (struct hv_netvsc_packet
*)context
;
114 struct sk_buff
*skb
= (struct sk_buff
*)
115 (unsigned long)packet
->Completion
.Send
.SendCompletionTid
;
120 struct net_device
*net
= skb
->dev
;
121 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
122 unsigned int num_pages
= skb_shinfo(skb
)->nr_frags
+ 2;
124 dev_kfree_skb_any(skb
);
126 if ((net_device_ctx
->avail
+= num_pages
) >= PACKET_PAGES_HIWATER
)
127 netif_wake_queue(net
);
131 static int netvsc_start_xmit(struct sk_buff
*skb
, struct net_device
*net
)
133 struct net_device_context
*net_device_ctx
= netdev_priv(net
);
134 struct driver_context
*driver_ctx
=
135 driver_to_driver_context(net_device_ctx
->device_ctx
->device
.driver
);
136 struct netvsc_driver_context
*net_drv_ctx
=
137 (struct netvsc_driver_context
*)driver_ctx
;
138 struct netvsc_driver
*net_drv_obj
= &net_drv_ctx
->drv_obj
;
139 struct hv_netvsc_packet
*packet
;
141 unsigned int i
, num_pages
;
143 DPRINT_DBG(NETVSC_DRV
, "xmit packet - len %d data_len %d",
144 skb
->len
, skb
->data_len
);
146 /* Add 1 for skb->data and additional one for RNDIS */
147 num_pages
= skb_shinfo(skb
)->nr_frags
+ 1 + 1;
148 if (num_pages
> net_device_ctx
->avail
)
149 return NETDEV_TX_BUSY
;
151 /* Allocate a netvsc packet based on # of frags. */
152 packet
= kzalloc(sizeof(struct hv_netvsc_packet
) +
153 (num_pages
* sizeof(struct hv_page_buffer
)) +
154 net_drv_obj
->RequestExtSize
, GFP_ATOMIC
);
156 /* out of memory, silently drop packet */
157 DPRINT_ERR(NETVSC_DRV
, "unable to allocate hv_netvsc_packet");
160 net
->stats
.tx_dropped
++;
164 packet
->Extension
= (void *)(unsigned long)packet
+
165 sizeof(struct hv_netvsc_packet
) +
166 (num_pages
* sizeof(struct hv_page_buffer
));
168 /* Setup the rndis header */
169 packet
->PageBufferCount
= num_pages
;
171 /* TODO: Flush all write buffers/ memory fence ??? */
174 /* Initialize it from the skb */
175 packet
->TotalDataBufferLength
= skb
->len
;
177 /* Start filling in the page buffers starting after RNDIS buffer. */
178 packet
->PageBuffers
[1].Pfn
= virt_to_phys(skb
->data
) >> PAGE_SHIFT
;
179 packet
->PageBuffers
[1].Offset
180 = (unsigned long)skb
->data
& (PAGE_SIZE
- 1);
181 packet
->PageBuffers
[1].Length
= skb_headlen(skb
);
183 /* Additional fragments are after SKB data */
184 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
185 skb_frag_t
*f
= &skb_shinfo(skb
)->frags
[i
];
187 packet
->PageBuffers
[i
+2].Pfn
= page_to_pfn(f
->page
);
188 packet
->PageBuffers
[i
+2].Offset
= f
->page_offset
;
189 packet
->PageBuffers
[i
+2].Length
= f
->size
;
192 /* Set the completion routine */
193 packet
->Completion
.Send
.OnSendCompletion
= netvsc_xmit_completion
;
194 packet
->Completion
.Send
.SendCompletionContext
= packet
;
195 packet
->Completion
.Send
.SendCompletionTid
= (unsigned long)skb
;
197 ret
= net_drv_obj
->OnSend(&net_device_ctx
->device_ctx
->device_obj
,
200 net
->stats
.tx_bytes
+= skb
->len
;
201 net
->stats
.tx_packets
++;
203 DPRINT_DBG(NETVSC_DRV
, "# of xmits %lu total size %lu",
204 net
->stats
.tx_packets
,
205 net
->stats
.tx_bytes
);
207 if ((net_device_ctx
->avail
-= num_pages
) < PACKET_PAGES_LOWATER
)
208 netif_stop_queue(net
);
210 /* we are shutting down or bus overloaded, just drop packet */
211 net
->stats
.tx_dropped
++;
212 netvsc_xmit_completion(packet
);
219 * netvsc_linkstatus_callback - Link up/down notification
221 static void netvsc_linkstatus_callback(struct hv_device
*device_obj
,
224 struct vm_device
*device_ctx
= to_vm_device(device_obj
);
225 struct net_device
*net
= dev_get_drvdata(&device_ctx
->device
);
228 DPRINT_ERR(NETVSC_DRV
, "got link status but net device "
229 "not initialized yet");
234 netif_carrier_on(net
);
235 netif_wake_queue(net
);
237 netif_carrier_off(net
);
238 netif_stop_queue(net
);
243 * netvsc_recv_callback - Callback when we receive a packet from the
244 * "wire" on the specified device.
246 static int netvsc_recv_callback(struct hv_device
*device_obj
,
247 struct hv_netvsc_packet
*packet
)
249 struct vm_device
*device_ctx
= to_vm_device(device_obj
);
250 struct net_device
*net
= dev_get_drvdata(&device_ctx
->device
);
257 DPRINT_ERR(NETVSC_DRV
, "got receive callback but net device "
258 "not initialized yet");
262 /* Allocate a skb - TODO direct I/O to pages? */
263 skb
= netdev_alloc_skb_ip_align(net
, packet
->TotalDataBufferLength
);
264 if (unlikely(!skb
)) {
265 ++net
->stats
.rx_dropped
;
269 /* for kmap_atomic */
270 local_irq_save(flags
);
273 * Copy to skb. This copy is needed here since the memory pointed by
274 * hv_netvsc_packet cannot be deallocated
276 for (i
= 0; i
< packet
->PageBufferCount
; i
++) {
277 data
= kmap_atomic(pfn_to_page(packet
->PageBuffers
[i
].Pfn
),
279 data
= (void *)(unsigned long)data
+
280 packet
->PageBuffers
[i
].Offset
;
282 memcpy(skb_put(skb
, packet
->PageBuffers
[i
].Length
), data
,
283 packet
->PageBuffers
[i
].Length
);
285 kunmap_atomic((void *)((unsigned long)data
-
286 packet
->PageBuffers
[i
].Offset
), KM_IRQ1
);
289 local_irq_restore(flags
);
291 skb
->protocol
= eth_type_trans(skb
, net
);
292 skb
->ip_summed
= CHECKSUM_NONE
;
294 net
->stats
.rx_packets
++;
295 net
->stats
.rx_bytes
+= skb
->len
;
298 * Pass the skb back up. Network stack will deallocate the skb when it
304 DPRINT_DBG(NETVSC_DRV
, "# of recvs %lu total size %lu",
305 net
->stats
.rx_packets
, net
->stats
.rx_bytes
);
310 static void netvsc_get_drvinfo(struct net_device
*net
,
311 struct ethtool_drvinfo
*info
)
313 strcpy(info
->driver
, "hv_netvsc");
314 strcpy(info
->version
, HV_DRV_VERSION
);
315 strcpy(info
->fw_version
, "N/A");
318 static const struct ethtool_ops ethtool_ops
= {
319 .get_drvinfo
= netvsc_get_drvinfo
,
320 .get_sg
= ethtool_op_get_sg
,
321 .set_sg
= ethtool_op_set_sg
,
322 .get_link
= ethtool_op_get_link
,
325 static const struct net_device_ops device_ops
= {
326 .ndo_open
= netvsc_open
,
327 .ndo_stop
= netvsc_close
,
328 .ndo_start_xmit
= netvsc_start_xmit
,
329 .ndo_set_multicast_list
= netvsc_set_multicast_list
,
330 .ndo_change_mtu
= eth_change_mtu
,
331 .ndo_validate_addr
= eth_validate_addr
,
332 .ndo_set_mac_address
= eth_mac_addr
,
335 static int netvsc_probe(struct device
*device
)
337 struct driver_context
*driver_ctx
=
338 driver_to_driver_context(device
->driver
);
339 struct netvsc_driver_context
*net_drv_ctx
=
340 (struct netvsc_driver_context
*)driver_ctx
;
341 struct netvsc_driver
*net_drv_obj
= &net_drv_ctx
->drv_obj
;
342 struct vm_device
*device_ctx
= device_to_vm_device(device
);
343 struct hv_device
*device_obj
= &device_ctx
->device_obj
;
344 struct net_device
*net
= NULL
;
345 struct net_device_context
*net_device_ctx
;
346 struct netvsc_device_info device_info
;
349 if (!net_drv_obj
->Base
.OnDeviceAdd
)
352 net
= alloc_etherdev(sizeof(struct net_device_context
));
356 /* Set initial state */
357 netif_carrier_off(net
);
358 netif_stop_queue(net
);
360 net_device_ctx
= netdev_priv(net
);
361 net_device_ctx
->device_ctx
= device_ctx
;
362 net_device_ctx
->avail
= ring_size
;
363 dev_set_drvdata(device
, net
);
365 /* Notify the netvsc driver of the new device */
366 ret
= net_drv_obj
->Base
.OnDeviceAdd(device_obj
, &device_info
);
369 dev_set_drvdata(device
, NULL
);
371 DPRINT_ERR(NETVSC_DRV
, "unable to add netvsc device (ret %d)",
377 * If carrier is still off ie we did not get a link status callback,
378 * update it if necessary
381 * FIXME: We should use a atomic or test/set instead to avoid getting
382 * out of sync with the device's link status
384 if (!netif_carrier_ok(net
))
385 if (!device_info
.LinkState
)
386 netif_carrier_on(net
);
388 memcpy(net
->dev_addr
, device_info
.MacAddr
, ETH_ALEN
);
390 net
->netdev_ops
= &device_ops
;
392 /* TODO: Add GSO and Checksum offload */
393 net
->features
= NETIF_F_SG
;
395 SET_ETHTOOL_OPS(net
, ðtool_ops
);
396 SET_NETDEV_DEV(net
, device
);
398 ret
= register_netdev(net
);
400 /* Remove the device and release the resource */
401 net_drv_obj
->Base
.OnDeviceRemove(device_obj
);
408 static int netvsc_remove(struct device
*device
)
410 struct driver_context
*driver_ctx
=
411 driver_to_driver_context(device
->driver
);
412 struct netvsc_driver_context
*net_drv_ctx
=
413 (struct netvsc_driver_context
*)driver_ctx
;
414 struct netvsc_driver
*net_drv_obj
= &net_drv_ctx
->drv_obj
;
415 struct vm_device
*device_ctx
= device_to_vm_device(device
);
416 struct net_device
*net
= dev_get_drvdata(&device_ctx
->device
);
417 struct hv_device
*device_obj
= &device_ctx
->device_obj
;
421 DPRINT_INFO(NETVSC
, "no net device to remove");
425 if (!net_drv_obj
->Base
.OnDeviceRemove
)
428 /* Stop outbound asap */
429 netif_stop_queue(net
);
430 /* netif_carrier_off(net); */
432 unregister_netdev(net
);
435 * Call to the vsc driver to let it know that the device is being
438 ret
= net_drv_obj
->Base
.OnDeviceRemove(device_obj
);
441 DPRINT_ERR(NETVSC
, "unable to remove vsc device (ret %d)", ret
);
448 static int netvsc_drv_exit_cb(struct device
*dev
, void *data
)
450 struct device
**curr
= (struct device
**)data
;
457 static void netvsc_drv_exit(void)
459 struct netvsc_driver
*netvsc_drv_obj
= &g_netvsc_drv
.drv_obj
;
460 struct driver_context
*drv_ctx
= &g_netvsc_drv
.drv_ctx
;
461 struct device
*current_dev
;
468 ret
= driver_for_each_device(&drv_ctx
->driver
, NULL
,
469 ¤t_dev
, netvsc_drv_exit_cb
);
471 DPRINT_WARN(NETVSC_DRV
,
472 "driver_for_each_device returned %d", ret
);
474 if (current_dev
== NULL
)
477 /* Initiate removal from the top-down */
478 DPRINT_INFO(NETVSC_DRV
, "unregistering device (%p)...",
481 device_unregister(current_dev
);
484 if (netvsc_drv_obj
->Base
.OnCleanup
)
485 netvsc_drv_obj
->Base
.OnCleanup(&netvsc_drv_obj
->Base
);
487 vmbus_child_driver_unregister(drv_ctx
);
492 static int netvsc_drv_init(int (*drv_init
)(struct hv_driver
*drv
))
494 struct netvsc_driver
*net_drv_obj
= &g_netvsc_drv
.drv_obj
;
495 struct driver_context
*drv_ctx
= &g_netvsc_drv
.drv_ctx
;
498 net_drv_obj
->RingBufferSize
= ring_size
* PAGE_SIZE
;
499 net_drv_obj
->OnReceiveCallback
= netvsc_recv_callback
;
500 net_drv_obj
->OnLinkStatusChanged
= netvsc_linkstatus_callback
;
502 /* Callback to client driver to complete the initialization */
503 drv_init(&net_drv_obj
->Base
);
505 drv_ctx
->driver
.name
= net_drv_obj
->Base
.name
;
506 memcpy(&drv_ctx
->class_id
, &net_drv_obj
->Base
.deviceType
,
507 sizeof(struct hv_guid
));
509 drv_ctx
->probe
= netvsc_probe
;
510 drv_ctx
->remove
= netvsc_remove
;
512 /* The driver belongs to vmbus */
513 ret
= vmbus_child_driver_register(drv_ctx
);
518 static const struct dmi_system_id __initconst
519 hv_netvsc_dmi_table
[] __maybe_unused
= {
523 DMI_MATCH(DMI_SYS_VENDOR
, "Microsoft Corporation"),
524 DMI_MATCH(DMI_PRODUCT_NAME
, "Virtual Machine"),
525 DMI_MATCH(DMI_BOARD_NAME
, "Virtual Machine"),
530 MODULE_DEVICE_TABLE(dmi
, hv_netvsc_dmi_table
);
532 static int __init
netvsc_init(void)
534 DPRINT_INFO(NETVSC_DRV
, "Netvsc initializing....");
536 if (!dmi_check_system(hv_netvsc_dmi_table
))
539 return netvsc_drv_init(NetVscInitialize
);
542 static void __exit
netvsc_exit(void)
547 static const struct pci_device_id __initconst
548 hv_netvsc_pci_table
[] __maybe_unused
= {
549 { PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
552 MODULE_DEVICE_TABLE(pci
, hv_netvsc_pci_table
);
554 MODULE_LICENSE("GPL");
555 MODULE_VERSION(HV_DRV_VERSION
);
556 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
558 module_init(netvsc_init
);
559 module_exit(netvsc_exit
);