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/kernel.h>
24 #include <linux/sched.h>
25 #include <linux/wait.h>
27 #include <linux/delay.h>
29 #include <linux/slab.h>
30 #include <linux/netdevice.h>
32 #include "hyperv_net.h"
35 static struct netvsc_device
*alloc_net_device(struct hv_device
*device
)
37 struct netvsc_device
*net_device
;
38 struct net_device
*ndev
= hv_get_drvdata(device
);
40 net_device
= kzalloc(sizeof(struct netvsc_device
), GFP_KERNEL
);
45 net_device
->destroy
= false;
46 net_device
->dev
= device
;
47 net_device
->ndev
= ndev
;
49 hv_set_drvdata(device
, net_device
);
53 static struct netvsc_device
*get_outbound_net_device(struct hv_device
*device
)
55 struct netvsc_device
*net_device
;
57 net_device
= hv_get_drvdata(device
);
58 if (net_device
&& net_device
->destroy
)
64 static struct netvsc_device
*get_inbound_net_device(struct hv_device
*device
)
66 struct netvsc_device
*net_device
;
68 net_device
= hv_get_drvdata(device
);
73 if (net_device
->destroy
&&
74 atomic_read(&net_device
->num_outstanding_sends
) == 0)
82 static int netvsc_destroy_recv_buf(struct netvsc_device
*net_device
)
84 struct nvsp_message
*revoke_packet
;
86 struct net_device
*ndev
= net_device
->ndev
;
89 * If we got a section count, it means we received a
90 * SendReceiveBufferComplete msg (ie sent
91 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
92 * to send a revoke msg here
94 if (net_device
->recv_section_cnt
) {
95 /* Send the revoke receive buffer */
96 revoke_packet
= &net_device
->revoke_packet
;
97 memset(revoke_packet
, 0, sizeof(struct nvsp_message
));
99 revoke_packet
->hdr
.msg_type
=
100 NVSP_MSG1_TYPE_REVOKE_RECV_BUF
;
101 revoke_packet
->msg
.v1_msg
.
102 revoke_recv_buf
.id
= NETVSC_RECEIVE_BUFFER_ID
;
104 ret
= vmbus_sendpacket(net_device
->dev
->channel
,
106 sizeof(struct nvsp_message
),
107 (unsigned long)revoke_packet
,
108 VM_PKT_DATA_INBAND
, 0);
110 * If we failed here, we might as well return and
111 * have a leak rather than continue and a bugchk
114 netdev_err(ndev
, "unable to send "
115 "revoke receive buffer to netvsp\n");
120 /* Teardown the gpadl on the vsp end */
121 if (net_device
->recv_buf_gpadl_handle
) {
122 ret
= vmbus_teardown_gpadl(net_device
->dev
->channel
,
123 net_device
->recv_buf_gpadl_handle
);
125 /* If we failed here, we might as well return and have a leak
126 * rather than continue and a bugchk
130 "unable to teardown receive buffer's gpadl\n");
133 net_device
->recv_buf_gpadl_handle
= 0;
136 if (net_device
->recv_buf
) {
137 /* Free up the receive buffer */
138 free_pages((unsigned long)net_device
->recv_buf
,
139 get_order(net_device
->recv_buf_size
));
140 net_device
->recv_buf
= NULL
;
143 if (net_device
->recv_section
) {
144 net_device
->recv_section_cnt
= 0;
145 kfree(net_device
->recv_section
);
146 net_device
->recv_section
= NULL
;
152 static int netvsc_init_recv_buf(struct hv_device
*device
)
156 struct netvsc_device
*net_device
;
157 struct nvsp_message
*init_packet
;
158 struct net_device
*ndev
;
160 net_device
= get_outbound_net_device(device
);
163 ndev
= net_device
->ndev
;
165 net_device
->recv_buf
=
166 (void *)__get_free_pages(GFP_KERNEL
|__GFP_ZERO
,
167 get_order(net_device
->recv_buf_size
));
168 if (!net_device
->recv_buf
) {
169 netdev_err(ndev
, "unable to allocate receive "
170 "buffer of size %d\n", net_device
->recv_buf_size
);
176 * Establish the gpadl handle for this buffer on this
177 * channel. Note: This call uses the vmbus connection rather
178 * than the channel to establish the gpadl handle.
180 ret
= vmbus_establish_gpadl(device
->channel
, net_device
->recv_buf
,
181 net_device
->recv_buf_size
,
182 &net_device
->recv_buf_gpadl_handle
);
185 "unable to establish receive buffer's gpadl\n");
190 /* Notify the NetVsp of the gpadl handle */
191 init_packet
= &net_device
->channel_init_pkt
;
193 memset(init_packet
, 0, sizeof(struct nvsp_message
));
195 init_packet
->hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_RECV_BUF
;
196 init_packet
->msg
.v1_msg
.send_recv_buf
.
197 gpadl_handle
= net_device
->recv_buf_gpadl_handle
;
198 init_packet
->msg
.v1_msg
.
199 send_recv_buf
.id
= NETVSC_RECEIVE_BUFFER_ID
;
201 /* Send the gpadl notification request */
202 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
203 sizeof(struct nvsp_message
),
204 (unsigned long)init_packet
,
206 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
209 "unable to send receive buffer's gpadl to netvsp\n");
213 t
= wait_for_completion_timeout(&net_device
->channel_init_wait
, 5*HZ
);
217 /* Check the response */
218 if (init_packet
->msg
.v1_msg
.
219 send_recv_buf_complete
.status
!= NVSP_STAT_SUCCESS
) {
220 netdev_err(ndev
, "Unable to complete receive buffer "
221 "initialization with NetVsp - status %d\n",
222 init_packet
->msg
.v1_msg
.
223 send_recv_buf_complete
.status
);
228 /* Parse the response */
230 net_device
->recv_section_cnt
= init_packet
->msg
.
231 v1_msg
.send_recv_buf_complete
.num_sections
;
233 net_device
->recv_section
= kmemdup(
234 init_packet
->msg
.v1_msg
.send_recv_buf_complete
.sections
,
235 net_device
->recv_section_cnt
*
236 sizeof(struct nvsp_1_receive_buffer_section
),
238 if (net_device
->recv_section
== NULL
) {
244 * For 1st release, there should only be 1 section that represents the
245 * entire receive buffer
247 if (net_device
->recv_section_cnt
!= 1 ||
248 net_device
->recv_section
->offset
!= 0) {
256 netvsc_destroy_recv_buf(net_device
);
263 static int netvsc_connect_vsp(struct hv_device
*device
)
266 struct netvsc_device
*net_device
;
267 struct nvsp_message
*init_packet
;
269 struct net_device
*ndev
;
271 net_device
= get_outbound_net_device(device
);
274 ndev
= net_device
->ndev
;
276 init_packet
= &net_device
->channel_init_pkt
;
278 memset(init_packet
, 0, sizeof(struct nvsp_message
));
279 init_packet
->hdr
.msg_type
= NVSP_MSG_TYPE_INIT
;
280 init_packet
->msg
.init_msg
.init
.min_protocol_ver
=
281 NVSP_MIN_PROTOCOL_VERSION
;
282 init_packet
->msg
.init_msg
.init
.max_protocol_ver
=
283 NVSP_MAX_PROTOCOL_VERSION
;
285 /* Send the init request */
286 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
287 sizeof(struct nvsp_message
),
288 (unsigned long)init_packet
,
290 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
295 t
= wait_for_completion_timeout(&net_device
->channel_init_wait
, 5*HZ
);
302 if (init_packet
->msg
.init_msg
.init_complete
.status
!=
308 if (init_packet
->msg
.init_msg
.init_complete
.
309 negotiated_protocol_ver
!= NVSP_PROTOCOL_VERSION_1
) {
313 /* Send the ndis version */
314 memset(init_packet
, 0, sizeof(struct nvsp_message
));
316 ndis_version
= 0x00050000;
318 init_packet
->hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_NDIS_VER
;
319 init_packet
->msg
.v1_msg
.
320 send_ndis_ver
.ndis_major_ver
=
321 (ndis_version
& 0xFFFF0000) >> 16;
322 init_packet
->msg
.v1_msg
.
323 send_ndis_ver
.ndis_minor_ver
=
324 ndis_version
& 0xFFFF;
326 /* Send the init request */
327 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
328 sizeof(struct nvsp_message
),
329 (unsigned long)init_packet
,
330 VM_PKT_DATA_INBAND
, 0);
334 /* Post the big receive buffer to NetVSP */
335 ret
= netvsc_init_recv_buf(device
);
341 static void netvsc_disconnect_vsp(struct netvsc_device
*net_device
)
343 netvsc_destroy_recv_buf(net_device
);
347 * netvsc_device_remove - Callback when the root bus device is removed
349 int netvsc_device_remove(struct hv_device
*device
)
351 struct netvsc_device
*net_device
;
352 struct hv_netvsc_packet
*netvsc_packet
, *pos
;
355 net_device
= hv_get_drvdata(device
);
356 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
357 net_device
->destroy
= true;
358 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
360 /* Wait for all send completions */
361 while (atomic_read(&net_device
->num_outstanding_sends
)) {
362 dev_info(&device
->device
,
363 "waiting for %d requests to complete...\n",
364 atomic_read(&net_device
->num_outstanding_sends
));
368 netvsc_disconnect_vsp(net_device
);
371 * Since we have already drained, we don't need to busy wait
372 * as was done in final_release_stor_device()
373 * Note that we cannot set the ext pointer to NULL until
374 * we have drained - to drain the outgoing packets, we need to
375 * allow incoming packets.
378 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
379 hv_set_drvdata(device
, NULL
);
380 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
383 * At this point, no one should be accessing net_device
386 dev_notice(&device
->device
, "net device safe to remove\n");
388 /* Now, we can close the channel safely */
389 vmbus_close(device
->channel
);
391 /* Release all resources */
392 list_for_each_entry_safe(netvsc_packet
, pos
,
393 &net_device
->recv_pkt_list
, list_ent
) {
394 list_del(&netvsc_packet
->list_ent
);
395 kfree(netvsc_packet
);
402 static void netvsc_send_completion(struct hv_device
*device
,
403 struct vmpacket_descriptor
*packet
)
405 struct netvsc_device
*net_device
;
406 struct nvsp_message
*nvsp_packet
;
407 struct hv_netvsc_packet
*nvsc_packet
;
408 struct net_device
*ndev
;
410 net_device
= get_inbound_net_device(device
);
413 ndev
= net_device
->ndev
;
415 nvsp_packet
= (struct nvsp_message
*)((unsigned long)packet
+
416 (packet
->offset8
<< 3));
418 if ((nvsp_packet
->hdr
.msg_type
== NVSP_MSG_TYPE_INIT_COMPLETE
) ||
419 (nvsp_packet
->hdr
.msg_type
==
420 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE
) ||
421 (nvsp_packet
->hdr
.msg_type
==
422 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE
)) {
423 /* Copy the response back */
424 memcpy(&net_device
->channel_init_pkt
, nvsp_packet
,
425 sizeof(struct nvsp_message
));
426 complete(&net_device
->channel_init_wait
);
427 } else if (nvsp_packet
->hdr
.msg_type
==
428 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE
) {
429 /* Get the send context */
430 nvsc_packet
= (struct hv_netvsc_packet
*)(unsigned long)
433 /* Notify the layer above us */
434 nvsc_packet
->completion
.send
.send_completion(
435 nvsc_packet
->completion
.send
.send_completion_ctx
);
437 atomic_dec(&net_device
->num_outstanding_sends
);
439 if (netif_queue_stopped(ndev
))
440 netif_wake_queue(ndev
);
442 netdev_err(ndev
, "Unknown send completion packet type- "
443 "%d received!!\n", nvsp_packet
->hdr
.msg_type
);
448 int netvsc_send(struct hv_device
*device
,
449 struct hv_netvsc_packet
*packet
)
451 struct netvsc_device
*net_device
;
453 struct nvsp_message sendMessage
;
454 struct net_device
*ndev
;
456 net_device
= get_outbound_net_device(device
);
459 ndev
= net_device
->ndev
;
461 sendMessage
.hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_RNDIS_PKT
;
462 if (packet
->is_data_pkt
) {
464 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.channel_type
= 0;
466 /* 1 is RMC_CONTROL; */
467 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.channel_type
= 1;
470 /* Not using send buffer section */
471 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.send_buf_section_index
=
473 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.send_buf_section_size
= 0;
475 if (packet
->page_buf_cnt
) {
476 ret
= vmbus_sendpacket_pagebuffer(device
->channel
,
478 packet
->page_buf_cnt
,
480 sizeof(struct nvsp_message
),
481 (unsigned long)packet
);
483 ret
= vmbus_sendpacket(device
->channel
, &sendMessage
,
484 sizeof(struct nvsp_message
),
485 (unsigned long)packet
,
487 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
492 atomic_inc(&net_device
->num_outstanding_sends
);
493 } else if (ret
== -EAGAIN
) {
494 netif_stop_queue(ndev
);
495 if (atomic_read(&net_device
->num_outstanding_sends
) < 1)
496 netif_wake_queue(ndev
);
498 netdev_err(ndev
, "Unable to send packet %p ret %d\n",
505 static void netvsc_send_recv_completion(struct hv_device
*device
,
508 struct nvsp_message recvcompMessage
;
511 struct net_device
*ndev
;
512 struct netvsc_device
*net_device
= hv_get_drvdata(device
);
514 ndev
= net_device
->ndev
;
516 recvcompMessage
.hdr
.msg_type
=
517 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE
;
519 /* FIXME: Pass in the status */
520 recvcompMessage
.msg
.v1_msg
.send_rndis_pkt_complete
.status
=
524 /* Send the completion */
525 ret
= vmbus_sendpacket(device
->channel
, &recvcompMessage
,
526 sizeof(struct nvsp_message
), transaction_id
,
531 } else if (ret
== -EAGAIN
) {
532 /* no more room...wait a bit and attempt to retry 3 times */
534 netdev_err(ndev
, "unable to send receive completion pkt"
535 " (tid %llx)...retrying %d\n", transaction_id
, retries
);
539 goto retry_send_cmplt
;
541 netdev_err(ndev
, "unable to send receive "
542 "completion pkt (tid %llx)...give up retrying\n",
546 netdev_err(ndev
, "unable to send receive "
547 "completion pkt - %llx\n", transaction_id
);
551 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
552 static void netvsc_receive_completion(void *context
)
554 struct hv_netvsc_packet
*packet
= context
;
555 struct hv_device
*device
= (struct hv_device
*)packet
->device
;
556 struct netvsc_device
*net_device
;
557 u64 transaction_id
= 0;
558 bool fsend_receive_comp
= false;
560 struct net_device
*ndev
;
563 * Even though it seems logical to do a GetOutboundNetDevice() here to
564 * send out receive completion, we are using GetInboundNetDevice()
565 * since we may have disable outbound traffic already.
567 net_device
= get_inbound_net_device(device
);
570 ndev
= net_device
->ndev
;
572 /* Overloading use of the lock. */
573 spin_lock_irqsave(&net_device
->recv_pkt_list_lock
, flags
);
575 packet
->xfer_page_pkt
->count
--;
578 * Last one in the line that represent 1 xfer page packet.
579 * Return the xfer page packet itself to the freelist
581 if (packet
->xfer_page_pkt
->count
== 0) {
582 fsend_receive_comp
= true;
583 transaction_id
= packet
->completion
.recv
.recv_completion_tid
;
584 list_add_tail(&packet
->xfer_page_pkt
->list_ent
,
585 &net_device
->recv_pkt_list
);
589 /* Put the packet back */
590 list_add_tail(&packet
->list_ent
, &net_device
->recv_pkt_list
);
591 spin_unlock_irqrestore(&net_device
->recv_pkt_list_lock
, flags
);
593 /* Send a receive completion for the xfer page packet */
594 if (fsend_receive_comp
)
595 netvsc_send_recv_completion(device
, transaction_id
);
599 static void netvsc_receive(struct hv_device
*device
,
600 struct vmpacket_descriptor
*packet
)
602 struct netvsc_device
*net_device
;
603 struct vmtransfer_page_packet_header
*vmxferpage_packet
;
604 struct nvsp_message
*nvsp_packet
;
605 struct hv_netvsc_packet
*netvsc_packet
= NULL
;
606 /* struct netvsc_driver *netvscDriver; */
607 struct xferpage_packet
*xferpage_packet
= NULL
;
611 struct net_device
*ndev
;
615 net_device
= get_inbound_net_device(device
);
618 ndev
= net_device
->ndev
;
621 * All inbound packets other than send completion should be xfer page
624 if (packet
->type
!= VM_PKT_DATA_USING_XFER_PAGES
) {
625 netdev_err(ndev
, "Unknown packet type received - %d\n",
630 nvsp_packet
= (struct nvsp_message
*)((unsigned long)packet
+
631 (packet
->offset8
<< 3));
633 /* Make sure this is a valid nvsp packet */
634 if (nvsp_packet
->hdr
.msg_type
!=
635 NVSP_MSG1_TYPE_SEND_RNDIS_PKT
) {
636 netdev_err(ndev
, "Unknown nvsp packet type received-"
637 " %d\n", nvsp_packet
->hdr
.msg_type
);
641 vmxferpage_packet
= (struct vmtransfer_page_packet_header
*)packet
;
643 if (vmxferpage_packet
->xfer_pageset_id
!= NETVSC_RECEIVE_BUFFER_ID
) {
644 netdev_err(ndev
, "Invalid xfer page set id - "
645 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID
,
646 vmxferpage_packet
->xfer_pageset_id
);
651 * Grab free packets (range count + 1) to represent this xfer
652 * page packet. +1 to represent the xfer page packet itself.
653 * We grab it here so that we know exactly how many we can
656 spin_lock_irqsave(&net_device
->recv_pkt_list_lock
, flags
);
657 while (!list_empty(&net_device
->recv_pkt_list
)) {
658 list_move_tail(net_device
->recv_pkt_list
.next
, &listHead
);
659 if (++count
== vmxferpage_packet
->range_cnt
+ 1)
662 spin_unlock_irqrestore(&net_device
->recv_pkt_list_lock
, flags
);
665 * We need at least 2 netvsc pkts (1 to represent the xfer
666 * page and at least 1 for the range) i.e. we can handled
667 * some of the xfer page packet ranges...
670 netdev_err(ndev
, "Got only %d netvsc pkt...needed "
671 "%d pkts. Dropping this xfer page packet completely!\n",
672 count
, vmxferpage_packet
->range_cnt
+ 1);
674 /* Return it to the freelist */
675 spin_lock_irqsave(&net_device
->recv_pkt_list_lock
, flags
);
676 for (i
= count
; i
!= 0; i
--) {
677 list_move_tail(listHead
.next
,
678 &net_device
->recv_pkt_list
);
680 spin_unlock_irqrestore(&net_device
->recv_pkt_list_lock
,
683 netvsc_send_recv_completion(device
,
684 vmxferpage_packet
->d
.trans_id
);
689 /* Remove the 1st packet to represent the xfer page packet itself */
690 xferpage_packet
= (struct xferpage_packet
*)listHead
.next
;
691 list_del(&xferpage_packet
->list_ent
);
693 /* This is how much we can satisfy */
694 xferpage_packet
->count
= count
- 1;
696 if (xferpage_packet
->count
!= vmxferpage_packet
->range_cnt
) {
697 netdev_err(ndev
, "Needed %d netvsc pkts to satisfy "
698 "this xfer page...got %d\n",
699 vmxferpage_packet
->range_cnt
, xferpage_packet
->count
);
702 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
703 for (i
= 0; i
< (count
- 1); i
++) {
704 netvsc_packet
= (struct hv_netvsc_packet
*)listHead
.next
;
705 list_del(&netvsc_packet
->list_ent
);
707 /* Initialize the netvsc packet */
708 netvsc_packet
->xfer_page_pkt
= xferpage_packet
;
709 netvsc_packet
->completion
.recv
.recv_completion
=
710 netvsc_receive_completion
;
711 netvsc_packet
->completion
.recv
.recv_completion_ctx
=
713 netvsc_packet
->device
= device
;
714 /* Save this so that we can send it back */
715 netvsc_packet
->completion
.recv
.recv_completion_tid
=
716 vmxferpage_packet
->d
.trans_id
;
718 netvsc_packet
->data
= (void *)((unsigned long)net_device
->
719 recv_buf
+ vmxferpage_packet
->ranges
[i
].byte_offset
);
720 netvsc_packet
->total_data_buflen
=
721 vmxferpage_packet
->ranges
[i
].byte_count
;
723 /* Pass it to the upper layer */
724 rndis_filter_receive(device
, netvsc_packet
);
726 netvsc_receive_completion(netvsc_packet
->
727 completion
.recv
.recv_completion_ctx
);
732 static void netvsc_channel_cb(void *context
)
735 struct hv_device
*device
= context
;
736 struct netvsc_device
*net_device
;
739 unsigned char *packet
;
740 struct vmpacket_descriptor
*desc
;
741 unsigned char *buffer
;
742 int bufferlen
= NETVSC_PACKET_SIZE
;
743 struct net_device
*ndev
;
745 packet
= kzalloc(NETVSC_PACKET_SIZE
* sizeof(unsigned char),
751 net_device
= get_inbound_net_device(device
);
754 ndev
= net_device
->ndev
;
757 ret
= vmbus_recvpacket_raw(device
->channel
, buffer
, bufferlen
,
758 &bytes_recvd
, &request_id
);
760 if (bytes_recvd
> 0) {
761 desc
= (struct vmpacket_descriptor
*)buffer
;
762 switch (desc
->type
) {
764 netvsc_send_completion(device
, desc
);
767 case VM_PKT_DATA_USING_XFER_PAGES
:
768 netvsc_receive(device
, desc
);
773 "unhandled packet type %d, "
775 desc
->type
, request_id
,
781 if (bufferlen
> NETVSC_PACKET_SIZE
) {
784 bufferlen
= NETVSC_PACKET_SIZE
;
788 if (bufferlen
> NETVSC_PACKET_SIZE
) {
791 bufferlen
= NETVSC_PACKET_SIZE
;
796 } else if (ret
== -ENOBUFS
) {
797 /* Handle large packet */
798 buffer
= kmalloc(bytes_recvd
, GFP_ATOMIC
);
799 if (buffer
== NULL
) {
800 /* Try again next time around */
802 "unable to allocate buffer of size "
803 "(%d)!!\n", bytes_recvd
);
807 bufferlen
= bytes_recvd
;
817 * netvsc_device_add - Callback when the device belonging to this
820 int netvsc_device_add(struct hv_device
*device
, void *additional_info
)
825 ((struct netvsc_device_info
*)additional_info
)->ring_size
;
826 struct netvsc_device
*net_device
;
827 struct hv_netvsc_packet
*packet
, *pos
;
828 struct net_device
*ndev
;
830 net_device
= alloc_net_device(device
);
837 * Coming into this function, struct net_device * is
838 * registered as the driver private data.
839 * In alloc_net_device(), we register struct netvsc_device *
840 * as the driver private data and stash away struct net_device *
841 * in struct netvsc_device *.
843 ndev
= net_device
->ndev
;
845 /* Initialize the NetVSC channel extension */
846 net_device
->recv_buf_size
= NETVSC_RECEIVE_BUFFER_SIZE
;
847 spin_lock_init(&net_device
->recv_pkt_list_lock
);
849 INIT_LIST_HEAD(&net_device
->recv_pkt_list
);
851 for (i
= 0; i
< NETVSC_RECEIVE_PACKETLIST_COUNT
; i
++) {
852 packet
= kzalloc(sizeof(struct hv_netvsc_packet
) +
853 (NETVSC_RECEIVE_SG_COUNT
*
854 sizeof(struct hv_page_buffer
)), GFP_KERNEL
);
858 list_add_tail(&packet
->list_ent
,
859 &net_device
->recv_pkt_list
);
861 init_completion(&net_device
->channel_init_wait
);
863 /* Open the channel */
864 ret
= vmbus_open(device
->channel
, ring_size
* PAGE_SIZE
,
865 ring_size
* PAGE_SIZE
, NULL
, 0,
866 netvsc_channel_cb
, device
);
869 netdev_err(ndev
, "unable to open channel: %d\n", ret
);
873 /* Channel is opened */
874 pr_info("hv_netvsc channel opened successfully\n");
876 /* Connect with the NetVsp */
877 ret
= netvsc_connect_vsp(device
);
880 "unable to connect to NetVSP - %d\n", ret
);
887 /* Now, we can close the channel safely */
888 vmbus_close(device
->channel
);
893 list_for_each_entry_safe(packet
, pos
,
894 &net_device
->recv_pkt_list
,
896 list_del(&packet
->list_ent
);