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>
31 #include <linux/if_ether.h>
33 #include "hyperv_net.h"
36 static struct netvsc_device
*alloc_net_device(struct hv_device
*device
)
38 struct netvsc_device
*net_device
;
39 struct net_device
*ndev
= hv_get_drvdata(device
);
41 net_device
= kzalloc(sizeof(struct netvsc_device
), GFP_KERNEL
);
45 init_waitqueue_head(&net_device
->wait_drain
);
46 net_device
->start_remove
= false;
47 net_device
->destroy
= false;
48 net_device
->dev
= device
;
49 net_device
->ndev
= ndev
;
51 hv_set_drvdata(device
, net_device
);
55 static struct netvsc_device
*get_outbound_net_device(struct hv_device
*device
)
57 struct netvsc_device
*net_device
;
59 net_device
= hv_get_drvdata(device
);
60 if (net_device
&& net_device
->destroy
)
66 static struct netvsc_device
*get_inbound_net_device(struct hv_device
*device
)
68 struct netvsc_device
*net_device
;
70 net_device
= hv_get_drvdata(device
);
75 if (net_device
->destroy
&&
76 atomic_read(&net_device
->num_outstanding_sends
) == 0)
84 static int netvsc_destroy_recv_buf(struct netvsc_device
*net_device
)
86 struct nvsp_message
*revoke_packet
;
88 struct net_device
*ndev
= net_device
->ndev
;
91 * If we got a section count, it means we received a
92 * SendReceiveBufferComplete msg (ie sent
93 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
94 * to send a revoke msg here
96 if (net_device
->recv_section_cnt
) {
97 /* Send the revoke receive buffer */
98 revoke_packet
= &net_device
->revoke_packet
;
99 memset(revoke_packet
, 0, sizeof(struct nvsp_message
));
101 revoke_packet
->hdr
.msg_type
=
102 NVSP_MSG1_TYPE_REVOKE_RECV_BUF
;
103 revoke_packet
->msg
.v1_msg
.
104 revoke_recv_buf
.id
= NETVSC_RECEIVE_BUFFER_ID
;
106 ret
= vmbus_sendpacket(net_device
->dev
->channel
,
108 sizeof(struct nvsp_message
),
109 (unsigned long)revoke_packet
,
110 VM_PKT_DATA_INBAND
, 0);
112 * If we failed here, we might as well return and
113 * have a leak rather than continue and a bugchk
116 netdev_err(ndev
, "unable to send "
117 "revoke receive buffer to netvsp\n");
122 /* Teardown the gpadl on the vsp end */
123 if (net_device
->recv_buf_gpadl_handle
) {
124 ret
= vmbus_teardown_gpadl(net_device
->dev
->channel
,
125 net_device
->recv_buf_gpadl_handle
);
127 /* If we failed here, we might as well return and have a leak
128 * rather than continue and a bugchk
132 "unable to teardown receive buffer's gpadl\n");
135 net_device
->recv_buf_gpadl_handle
= 0;
138 if (net_device
->recv_buf
) {
139 /* Free up the receive buffer */
140 free_pages((unsigned long)net_device
->recv_buf
,
141 get_order(net_device
->recv_buf_size
));
142 net_device
->recv_buf
= NULL
;
145 if (net_device
->recv_section
) {
146 net_device
->recv_section_cnt
= 0;
147 kfree(net_device
->recv_section
);
148 net_device
->recv_section
= NULL
;
154 static int netvsc_init_recv_buf(struct hv_device
*device
)
158 struct netvsc_device
*net_device
;
159 struct nvsp_message
*init_packet
;
160 struct net_device
*ndev
;
162 net_device
= get_outbound_net_device(device
);
165 ndev
= net_device
->ndev
;
167 net_device
->recv_buf
=
168 (void *)__get_free_pages(GFP_KERNEL
|__GFP_ZERO
,
169 get_order(net_device
->recv_buf_size
));
170 if (!net_device
->recv_buf
) {
171 netdev_err(ndev
, "unable to allocate receive "
172 "buffer of size %d\n", net_device
->recv_buf_size
);
178 * Establish the gpadl handle for this buffer on this
179 * channel. Note: This call uses the vmbus connection rather
180 * than the channel to establish the gpadl handle.
182 ret
= vmbus_establish_gpadl(device
->channel
, net_device
->recv_buf
,
183 net_device
->recv_buf_size
,
184 &net_device
->recv_buf_gpadl_handle
);
187 "unable to establish receive buffer's gpadl\n");
192 /* Notify the NetVsp of the gpadl handle */
193 init_packet
= &net_device
->channel_init_pkt
;
195 memset(init_packet
, 0, sizeof(struct nvsp_message
));
197 init_packet
->hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_RECV_BUF
;
198 init_packet
->msg
.v1_msg
.send_recv_buf
.
199 gpadl_handle
= net_device
->recv_buf_gpadl_handle
;
200 init_packet
->msg
.v1_msg
.
201 send_recv_buf
.id
= NETVSC_RECEIVE_BUFFER_ID
;
203 /* Send the gpadl notification request */
204 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
205 sizeof(struct nvsp_message
),
206 (unsigned long)init_packet
,
208 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
211 "unable to send receive buffer's gpadl to netvsp\n");
215 t
= wait_for_completion_timeout(&net_device
->channel_init_wait
, 5*HZ
);
219 /* Check the response */
220 if (init_packet
->msg
.v1_msg
.
221 send_recv_buf_complete
.status
!= NVSP_STAT_SUCCESS
) {
222 netdev_err(ndev
, "Unable to complete receive buffer "
223 "initialization with NetVsp - status %d\n",
224 init_packet
->msg
.v1_msg
.
225 send_recv_buf_complete
.status
);
230 /* Parse the response */
232 net_device
->recv_section_cnt
= init_packet
->msg
.
233 v1_msg
.send_recv_buf_complete
.num_sections
;
235 net_device
->recv_section
= kmemdup(
236 init_packet
->msg
.v1_msg
.send_recv_buf_complete
.sections
,
237 net_device
->recv_section_cnt
*
238 sizeof(struct nvsp_1_receive_buffer_section
),
240 if (net_device
->recv_section
== NULL
) {
246 * For 1st release, there should only be 1 section that represents the
247 * entire receive buffer
249 if (net_device
->recv_section_cnt
!= 1 ||
250 net_device
->recv_section
->offset
!= 0) {
258 netvsc_destroy_recv_buf(net_device
);
265 /* Negotiate NVSP protocol version */
266 static int negotiate_nvsp_ver(struct hv_device
*device
,
267 struct netvsc_device
*net_device
,
268 struct nvsp_message
*init_packet
,
273 memset(init_packet
, 0, sizeof(struct nvsp_message
));
274 init_packet
->hdr
.msg_type
= NVSP_MSG_TYPE_INIT
;
275 init_packet
->msg
.init_msg
.init
.min_protocol_ver
= nvsp_ver
;
276 init_packet
->msg
.init_msg
.init
.max_protocol_ver
= nvsp_ver
;
278 /* Send the init request */
279 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
280 sizeof(struct nvsp_message
),
281 (unsigned long)init_packet
,
283 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
288 t
= wait_for_completion_timeout(&net_device
->channel_init_wait
, 5*HZ
);
293 if (init_packet
->msg
.init_msg
.init_complete
.status
!=
297 if (nvsp_ver
!= NVSP_PROTOCOL_VERSION_2
)
300 /* NVSPv2 only: Send NDIS config */
301 memset(init_packet
, 0, sizeof(struct nvsp_message
));
302 init_packet
->hdr
.msg_type
= NVSP_MSG2_TYPE_SEND_NDIS_CONFIG
;
303 init_packet
->msg
.v2_msg
.send_ndis_config
.mtu
= net_device
->ndev
->mtu
;
304 init_packet
->msg
.v2_msg
.send_ndis_config
.capability
.ieee8021q
= 1;
306 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
307 sizeof(struct nvsp_message
),
308 (unsigned long)init_packet
,
309 VM_PKT_DATA_INBAND
, 0);
314 static int netvsc_connect_vsp(struct hv_device
*device
)
317 struct netvsc_device
*net_device
;
318 struct nvsp_message
*init_packet
;
320 struct net_device
*ndev
;
322 net_device
= get_outbound_net_device(device
);
325 ndev
= net_device
->ndev
;
327 init_packet
= &net_device
->channel_init_pkt
;
329 /* Negotiate the latest NVSP protocol supported */
330 if (negotiate_nvsp_ver(device
, net_device
, init_packet
,
331 NVSP_PROTOCOL_VERSION_2
) == 0) {
332 net_device
->nvsp_version
= NVSP_PROTOCOL_VERSION_2
;
333 } else if (negotiate_nvsp_ver(device
, net_device
, init_packet
,
334 NVSP_PROTOCOL_VERSION_1
) == 0) {
335 net_device
->nvsp_version
= NVSP_PROTOCOL_VERSION_1
;
341 pr_debug("Negotiated NVSP version:%x\n", net_device
->nvsp_version
);
343 /* Send the ndis version */
344 memset(init_packet
, 0, sizeof(struct nvsp_message
));
346 ndis_version
= 0x00050001;
348 init_packet
->hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_NDIS_VER
;
349 init_packet
->msg
.v1_msg
.
350 send_ndis_ver
.ndis_major_ver
=
351 (ndis_version
& 0xFFFF0000) >> 16;
352 init_packet
->msg
.v1_msg
.
353 send_ndis_ver
.ndis_minor_ver
=
354 ndis_version
& 0xFFFF;
356 /* Send the init request */
357 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
358 sizeof(struct nvsp_message
),
359 (unsigned long)init_packet
,
360 VM_PKT_DATA_INBAND
, 0);
364 /* Post the big receive buffer to NetVSP */
365 ret
= netvsc_init_recv_buf(device
);
371 static void netvsc_disconnect_vsp(struct netvsc_device
*net_device
)
373 netvsc_destroy_recv_buf(net_device
);
377 * netvsc_device_remove - Callback when the root bus device is removed
379 int netvsc_device_remove(struct hv_device
*device
)
381 struct netvsc_device
*net_device
;
382 struct hv_netvsc_packet
*netvsc_packet
, *pos
;
385 net_device
= hv_get_drvdata(device
);
386 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
387 net_device
->destroy
= true;
388 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
390 /* Wait for all send completions */
391 wait_event(net_device
->wait_drain
,
392 atomic_read(&net_device
->num_outstanding_sends
) == 0);
394 netvsc_disconnect_vsp(net_device
);
397 * Since we have already drained, we don't need to busy wait
398 * as was done in final_release_stor_device()
399 * Note that we cannot set the ext pointer to NULL until
400 * we have drained - to drain the outgoing packets, we need to
401 * allow incoming packets.
404 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
405 hv_set_drvdata(device
, NULL
);
406 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
409 * At this point, no one should be accessing net_device
412 dev_notice(&device
->device
, "net device safe to remove\n");
414 /* Now, we can close the channel safely */
415 vmbus_close(device
->channel
);
417 /* Release all resources */
418 list_for_each_entry_safe(netvsc_packet
, pos
,
419 &net_device
->recv_pkt_list
, list_ent
) {
420 list_del(&netvsc_packet
->list_ent
);
421 kfree(netvsc_packet
);
429 #define RING_AVAIL_PERCENT_HIWATER 20
430 #define RING_AVAIL_PERCENT_LOWATER 10
433 * Get the percentage of available bytes to write in the ring.
434 * The return value is in range from 0 to 100.
436 static inline u32
hv_ringbuf_avail_percent(
437 struct hv_ring_buffer_info
*ring_info
)
439 u32 avail_read
, avail_write
;
441 hv_get_ringbuffer_availbytes(ring_info
, &avail_read
, &avail_write
);
443 return avail_write
* 100 / ring_info
->ring_datasize
;
446 static void netvsc_send_completion(struct hv_device
*device
,
447 struct vmpacket_descriptor
*packet
)
449 struct netvsc_device
*net_device
;
450 struct nvsp_message
*nvsp_packet
;
451 struct hv_netvsc_packet
*nvsc_packet
;
452 struct net_device
*ndev
;
454 net_device
= get_inbound_net_device(device
);
457 ndev
= net_device
->ndev
;
459 nvsp_packet
= (struct nvsp_message
*)((unsigned long)packet
+
460 (packet
->offset8
<< 3));
462 if ((nvsp_packet
->hdr
.msg_type
== NVSP_MSG_TYPE_INIT_COMPLETE
) ||
463 (nvsp_packet
->hdr
.msg_type
==
464 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE
) ||
465 (nvsp_packet
->hdr
.msg_type
==
466 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE
)) {
467 /* Copy the response back */
468 memcpy(&net_device
->channel_init_pkt
, nvsp_packet
,
469 sizeof(struct nvsp_message
));
470 complete(&net_device
->channel_init_wait
);
471 } else if (nvsp_packet
->hdr
.msg_type
==
472 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE
) {
473 int num_outstanding_sends
;
475 /* Get the send context */
476 nvsc_packet
= (struct hv_netvsc_packet
*)(unsigned long)
479 /* Notify the layer above us */
480 nvsc_packet
->completion
.send
.send_completion(
481 nvsc_packet
->completion
.send
.send_completion_ctx
);
483 num_outstanding_sends
=
484 atomic_dec_return(&net_device
->num_outstanding_sends
);
486 if (net_device
->destroy
&& num_outstanding_sends
== 0)
487 wake_up(&net_device
->wait_drain
);
489 if (netif_queue_stopped(ndev
) && !net_device
->start_remove
&&
490 (hv_ringbuf_avail_percent(&device
->channel
->outbound
)
491 > RING_AVAIL_PERCENT_HIWATER
||
492 num_outstanding_sends
< 1))
493 netif_wake_queue(ndev
);
495 netdev_err(ndev
, "Unknown send completion packet type- "
496 "%d received!!\n", nvsp_packet
->hdr
.msg_type
);
501 int netvsc_send(struct hv_device
*device
,
502 struct hv_netvsc_packet
*packet
)
504 struct netvsc_device
*net_device
;
506 struct nvsp_message sendMessage
;
507 struct net_device
*ndev
;
509 net_device
= get_outbound_net_device(device
);
512 ndev
= net_device
->ndev
;
514 sendMessage
.hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_RNDIS_PKT
;
515 if (packet
->is_data_pkt
) {
517 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.channel_type
= 0;
519 /* 1 is RMC_CONTROL; */
520 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.channel_type
= 1;
523 /* Not using send buffer section */
524 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.send_buf_section_index
=
526 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.send_buf_section_size
= 0;
528 if (packet
->page_buf_cnt
) {
529 ret
= vmbus_sendpacket_pagebuffer(device
->channel
,
531 packet
->page_buf_cnt
,
533 sizeof(struct nvsp_message
),
534 (unsigned long)packet
);
536 ret
= vmbus_sendpacket(device
->channel
, &sendMessage
,
537 sizeof(struct nvsp_message
),
538 (unsigned long)packet
,
540 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
545 atomic_inc(&net_device
->num_outstanding_sends
);
546 if (hv_ringbuf_avail_percent(&device
->channel
->outbound
) <
547 RING_AVAIL_PERCENT_LOWATER
) {
548 netif_stop_queue(ndev
);
549 if (atomic_read(&net_device
->
550 num_outstanding_sends
) < 1)
551 netif_wake_queue(ndev
);
553 } else if (ret
== -EAGAIN
) {
554 netif_stop_queue(ndev
);
555 if (atomic_read(&net_device
->num_outstanding_sends
) < 1) {
556 netif_wake_queue(ndev
);
560 netdev_err(ndev
, "Unable to send packet %p ret %d\n",
567 static void netvsc_send_recv_completion(struct hv_device
*device
,
570 struct nvsp_message recvcompMessage
;
573 struct net_device
*ndev
;
574 struct netvsc_device
*net_device
= hv_get_drvdata(device
);
576 ndev
= net_device
->ndev
;
578 recvcompMessage
.hdr
.msg_type
=
579 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE
;
581 /* FIXME: Pass in the status */
582 recvcompMessage
.msg
.v1_msg
.send_rndis_pkt_complete
.status
=
586 /* Send the completion */
587 ret
= vmbus_sendpacket(device
->channel
, &recvcompMessage
,
588 sizeof(struct nvsp_message
), transaction_id
,
593 } else if (ret
== -EAGAIN
) {
594 /* no more room...wait a bit and attempt to retry 3 times */
596 netdev_err(ndev
, "unable to send receive completion pkt"
597 " (tid %llx)...retrying %d\n", transaction_id
, retries
);
601 goto retry_send_cmplt
;
603 netdev_err(ndev
, "unable to send receive "
604 "completion pkt (tid %llx)...give up retrying\n",
608 netdev_err(ndev
, "unable to send receive "
609 "completion pkt - %llx\n", transaction_id
);
613 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
614 static void netvsc_receive_completion(void *context
)
616 struct hv_netvsc_packet
*packet
= context
;
617 struct hv_device
*device
= packet
->device
;
618 struct netvsc_device
*net_device
;
619 u64 transaction_id
= 0;
620 bool fsend_receive_comp
= false;
622 struct net_device
*ndev
;
625 * Even though it seems logical to do a GetOutboundNetDevice() here to
626 * send out receive completion, we are using GetInboundNetDevice()
627 * since we may have disable outbound traffic already.
629 net_device
= get_inbound_net_device(device
);
632 ndev
= net_device
->ndev
;
634 /* Overloading use of the lock. */
635 spin_lock_irqsave(&net_device
->recv_pkt_list_lock
, flags
);
637 packet
->xfer_page_pkt
->count
--;
640 * Last one in the line that represent 1 xfer page packet.
641 * Return the xfer page packet itself to the freelist
643 if (packet
->xfer_page_pkt
->count
== 0) {
644 fsend_receive_comp
= true;
645 transaction_id
= packet
->completion
.recv
.recv_completion_tid
;
646 list_add_tail(&packet
->xfer_page_pkt
->list_ent
,
647 &net_device
->recv_pkt_list
);
651 /* Put the packet back */
652 list_add_tail(&packet
->list_ent
, &net_device
->recv_pkt_list
);
653 spin_unlock_irqrestore(&net_device
->recv_pkt_list_lock
, flags
);
655 /* Send a receive completion for the xfer page packet */
656 if (fsend_receive_comp
)
657 netvsc_send_recv_completion(device
, transaction_id
);
661 static void netvsc_receive(struct hv_device
*device
,
662 struct vmpacket_descriptor
*packet
)
664 struct netvsc_device
*net_device
;
665 struct vmtransfer_page_packet_header
*vmxferpage_packet
;
666 struct nvsp_message
*nvsp_packet
;
667 struct hv_netvsc_packet
*netvsc_packet
= NULL
;
668 /* struct netvsc_driver *netvscDriver; */
669 struct xferpage_packet
*xferpage_packet
= NULL
;
673 struct net_device
*ndev
;
677 net_device
= get_inbound_net_device(device
);
680 ndev
= net_device
->ndev
;
683 * All inbound packets other than send completion should be xfer page
686 if (packet
->type
!= VM_PKT_DATA_USING_XFER_PAGES
) {
687 netdev_err(ndev
, "Unknown packet type received - %d\n",
692 nvsp_packet
= (struct nvsp_message
*)((unsigned long)packet
+
693 (packet
->offset8
<< 3));
695 /* Make sure this is a valid nvsp packet */
696 if (nvsp_packet
->hdr
.msg_type
!=
697 NVSP_MSG1_TYPE_SEND_RNDIS_PKT
) {
698 netdev_err(ndev
, "Unknown nvsp packet type received-"
699 " %d\n", nvsp_packet
->hdr
.msg_type
);
703 vmxferpage_packet
= (struct vmtransfer_page_packet_header
*)packet
;
705 if (vmxferpage_packet
->xfer_pageset_id
!= NETVSC_RECEIVE_BUFFER_ID
) {
706 netdev_err(ndev
, "Invalid xfer page set id - "
707 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID
,
708 vmxferpage_packet
->xfer_pageset_id
);
713 * Grab free packets (range count + 1) to represent this xfer
714 * page packet. +1 to represent the xfer page packet itself.
715 * We grab it here so that we know exactly how many we can
718 spin_lock_irqsave(&net_device
->recv_pkt_list_lock
, flags
);
719 while (!list_empty(&net_device
->recv_pkt_list
)) {
720 list_move_tail(net_device
->recv_pkt_list
.next
, &listHead
);
721 if (++count
== vmxferpage_packet
->range_cnt
+ 1)
724 spin_unlock_irqrestore(&net_device
->recv_pkt_list_lock
, flags
);
727 * We need at least 2 netvsc pkts (1 to represent the xfer
728 * page and at least 1 for the range) i.e. we can handled
729 * some of the xfer page packet ranges...
732 netdev_err(ndev
, "Got only %d netvsc pkt...needed "
733 "%d pkts. Dropping this xfer page packet completely!\n",
734 count
, vmxferpage_packet
->range_cnt
+ 1);
736 /* Return it to the freelist */
737 spin_lock_irqsave(&net_device
->recv_pkt_list_lock
, flags
);
738 for (i
= count
; i
!= 0; i
--) {
739 list_move_tail(listHead
.next
,
740 &net_device
->recv_pkt_list
);
742 spin_unlock_irqrestore(&net_device
->recv_pkt_list_lock
,
745 netvsc_send_recv_completion(device
,
746 vmxferpage_packet
->d
.trans_id
);
751 /* Remove the 1st packet to represent the xfer page packet itself */
752 xferpage_packet
= (struct xferpage_packet
*)listHead
.next
;
753 list_del(&xferpage_packet
->list_ent
);
755 /* This is how much we can satisfy */
756 xferpage_packet
->count
= count
- 1;
758 if (xferpage_packet
->count
!= vmxferpage_packet
->range_cnt
) {
759 netdev_err(ndev
, "Needed %d netvsc pkts to satisfy "
760 "this xfer page...got %d\n",
761 vmxferpage_packet
->range_cnt
, xferpage_packet
->count
);
764 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
765 for (i
= 0; i
< (count
- 1); i
++) {
766 netvsc_packet
= (struct hv_netvsc_packet
*)listHead
.next
;
767 list_del(&netvsc_packet
->list_ent
);
769 /* Initialize the netvsc packet */
770 netvsc_packet
->xfer_page_pkt
= xferpage_packet
;
771 netvsc_packet
->completion
.recv
.recv_completion
=
772 netvsc_receive_completion
;
773 netvsc_packet
->completion
.recv
.recv_completion_ctx
=
775 netvsc_packet
->device
= device
;
776 /* Save this so that we can send it back */
777 netvsc_packet
->completion
.recv
.recv_completion_tid
=
778 vmxferpage_packet
->d
.trans_id
;
780 netvsc_packet
->data
= (void *)((unsigned long)net_device
->
781 recv_buf
+ vmxferpage_packet
->ranges
[i
].byte_offset
);
782 netvsc_packet
->total_data_buflen
=
783 vmxferpage_packet
->ranges
[i
].byte_count
;
785 /* Pass it to the upper layer */
786 rndis_filter_receive(device
, netvsc_packet
);
788 netvsc_receive_completion(netvsc_packet
->
789 completion
.recv
.recv_completion_ctx
);
794 static void netvsc_channel_cb(void *context
)
797 struct hv_device
*device
= context
;
798 struct netvsc_device
*net_device
;
801 unsigned char *packet
;
802 struct vmpacket_descriptor
*desc
;
803 unsigned char *buffer
;
804 int bufferlen
= NETVSC_PACKET_SIZE
;
805 struct net_device
*ndev
;
807 packet
= kzalloc(NETVSC_PACKET_SIZE
* sizeof(unsigned char),
813 net_device
= get_inbound_net_device(device
);
816 ndev
= net_device
->ndev
;
819 ret
= vmbus_recvpacket_raw(device
->channel
, buffer
, bufferlen
,
820 &bytes_recvd
, &request_id
);
822 if (bytes_recvd
> 0) {
823 desc
= (struct vmpacket_descriptor
*)buffer
;
824 switch (desc
->type
) {
826 netvsc_send_completion(device
, desc
);
829 case VM_PKT_DATA_USING_XFER_PAGES
:
830 netvsc_receive(device
, desc
);
835 "unhandled packet type %d, "
837 desc
->type
, request_id
,
843 if (bufferlen
> NETVSC_PACKET_SIZE
) {
846 bufferlen
= NETVSC_PACKET_SIZE
;
850 if (bufferlen
> NETVSC_PACKET_SIZE
) {
853 bufferlen
= NETVSC_PACKET_SIZE
;
858 } else if (ret
== -ENOBUFS
) {
859 /* Handle large packet */
860 buffer
= kmalloc(bytes_recvd
, GFP_ATOMIC
);
861 if (buffer
== NULL
) {
862 /* Try again next time around */
864 "unable to allocate buffer of size "
865 "(%d)!!\n", bytes_recvd
);
869 bufferlen
= bytes_recvd
;
879 * netvsc_device_add - Callback when the device belonging to this
882 int netvsc_device_add(struct hv_device
*device
, void *additional_info
)
887 ((struct netvsc_device_info
*)additional_info
)->ring_size
;
888 struct netvsc_device
*net_device
;
889 struct hv_netvsc_packet
*packet
, *pos
;
890 struct net_device
*ndev
;
892 net_device
= alloc_net_device(device
);
899 * Coming into this function, struct net_device * is
900 * registered as the driver private data.
901 * In alloc_net_device(), we register struct netvsc_device *
902 * as the driver private data and stash away struct net_device *
903 * in struct netvsc_device *.
905 ndev
= net_device
->ndev
;
907 /* Initialize the NetVSC channel extension */
908 net_device
->recv_buf_size
= NETVSC_RECEIVE_BUFFER_SIZE
;
909 spin_lock_init(&net_device
->recv_pkt_list_lock
);
911 INIT_LIST_HEAD(&net_device
->recv_pkt_list
);
913 for (i
= 0; i
< NETVSC_RECEIVE_PACKETLIST_COUNT
; i
++) {
914 packet
= kzalloc(sizeof(struct hv_netvsc_packet
) +
915 (NETVSC_RECEIVE_SG_COUNT
*
916 sizeof(struct hv_page_buffer
)), GFP_KERNEL
);
920 list_add_tail(&packet
->list_ent
,
921 &net_device
->recv_pkt_list
);
923 init_completion(&net_device
->channel_init_wait
);
925 /* Open the channel */
926 ret
= vmbus_open(device
->channel
, ring_size
* PAGE_SIZE
,
927 ring_size
* PAGE_SIZE
, NULL
, 0,
928 netvsc_channel_cb
, device
);
931 netdev_err(ndev
, "unable to open channel: %d\n", ret
);
935 /* Channel is opened */
936 pr_info("hv_netvsc channel opened successfully\n");
938 /* Connect with the NetVsp */
939 ret
= netvsc_connect_vsp(device
);
942 "unable to connect to NetVSP - %d\n", ret
);
949 /* Now, we can close the channel safely */
950 vmbus_close(device
->channel
);
955 list_for_each_entry_safe(packet
, pos
,
956 &net_device
->recv_pkt_list
,
958 list_del(&packet
->list_ent
);