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, see <http://www.gnu.org/licenses/>.
17 * Haiyang Zhang <haiyangz@microsoft.com>
18 * Hank Janssen <hjanssen@microsoft.com>
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22 #include <linux/kernel.h>
23 #include <linux/sched.h>
24 #include <linux/wait.h>
26 #include <linux/delay.h>
28 #include <linux/slab.h>
29 #include <linux/netdevice.h>
30 #include <linux/if_ether.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
);
44 init_waitqueue_head(&net_device
->wait_drain
);
45 net_device
->start_remove
= false;
46 net_device
->destroy
= false;
47 net_device
->dev
= device
;
48 net_device
->ndev
= ndev
;
50 hv_set_drvdata(device
, net_device
);
54 static struct netvsc_device
*get_outbound_net_device(struct hv_device
*device
)
56 struct netvsc_device
*net_device
;
58 net_device
= hv_get_drvdata(device
);
59 if (net_device
&& net_device
->destroy
)
65 static struct netvsc_device
*get_inbound_net_device(struct hv_device
*device
)
67 struct netvsc_device
*net_device
;
69 net_device
= hv_get_drvdata(device
);
74 if (net_device
->destroy
&&
75 atomic_read(&net_device
->num_outstanding_sends
) == 0)
83 static int netvsc_destroy_recv_buf(struct netvsc_device
*net_device
)
85 struct nvsp_message
*revoke_packet
;
87 struct net_device
*ndev
= net_device
->ndev
;
90 * If we got a section count, it means we received a
91 * SendReceiveBufferComplete msg (ie sent
92 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
93 * to send a revoke msg here
95 if (net_device
->recv_section_cnt
) {
96 /* Send the revoke receive buffer */
97 revoke_packet
= &net_device
->revoke_packet
;
98 memset(revoke_packet
, 0, sizeof(struct nvsp_message
));
100 revoke_packet
->hdr
.msg_type
=
101 NVSP_MSG1_TYPE_REVOKE_RECV_BUF
;
102 revoke_packet
->msg
.v1_msg
.
103 revoke_recv_buf
.id
= NETVSC_RECEIVE_BUFFER_ID
;
105 ret
= vmbus_sendpacket(net_device
->dev
->channel
,
107 sizeof(struct nvsp_message
),
108 (unsigned long)revoke_packet
,
109 VM_PKT_DATA_INBAND
, 0);
111 * If we failed here, we might as well return and
112 * have a leak rather than continue and a bugchk
115 netdev_err(ndev
, "unable to send "
116 "revoke receive buffer to netvsp\n");
121 /* Teardown the gpadl on the vsp end */
122 if (net_device
->recv_buf_gpadl_handle
) {
123 ret
= vmbus_teardown_gpadl(net_device
->dev
->channel
,
124 net_device
->recv_buf_gpadl_handle
);
126 /* If we failed here, we might as well return and have a leak
127 * rather than continue and a bugchk
131 "unable to teardown receive buffer's gpadl\n");
134 net_device
->recv_buf_gpadl_handle
= 0;
137 if (net_device
->recv_buf
) {
138 /* Free up the receive buffer */
139 vfree(net_device
->recv_buf
);
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
= vzalloc(net_device
->recv_buf_size
);
166 if (!net_device
->recv_buf
) {
167 netdev_err(ndev
, "unable to allocate receive "
168 "buffer of size %d\n", net_device
->recv_buf_size
);
174 * Establish the gpadl handle for this buffer on this
175 * channel. Note: This call uses the vmbus connection rather
176 * than the channel to establish the gpadl handle.
178 ret
= vmbus_establish_gpadl(device
->channel
, net_device
->recv_buf
,
179 net_device
->recv_buf_size
,
180 &net_device
->recv_buf_gpadl_handle
);
183 "unable to establish receive buffer's gpadl\n");
188 /* Notify the NetVsp of the gpadl handle */
189 init_packet
= &net_device
->channel_init_pkt
;
191 memset(init_packet
, 0, sizeof(struct nvsp_message
));
193 init_packet
->hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_RECV_BUF
;
194 init_packet
->msg
.v1_msg
.send_recv_buf
.
195 gpadl_handle
= net_device
->recv_buf_gpadl_handle
;
196 init_packet
->msg
.v1_msg
.
197 send_recv_buf
.id
= NETVSC_RECEIVE_BUFFER_ID
;
199 /* Send the gpadl notification request */
200 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
201 sizeof(struct nvsp_message
),
202 (unsigned long)init_packet
,
204 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
207 "unable to send receive buffer's gpadl to netvsp\n");
211 t
= wait_for_completion_timeout(&net_device
->channel_init_wait
, 5*HZ
);
215 /* Check the response */
216 if (init_packet
->msg
.v1_msg
.
217 send_recv_buf_complete
.status
!= NVSP_STAT_SUCCESS
) {
218 netdev_err(ndev
, "Unable to complete receive buffer "
219 "initialization with NetVsp - status %d\n",
220 init_packet
->msg
.v1_msg
.
221 send_recv_buf_complete
.status
);
226 /* Parse the response */
228 net_device
->recv_section_cnt
= init_packet
->msg
.
229 v1_msg
.send_recv_buf_complete
.num_sections
;
231 net_device
->recv_section
= kmemdup(
232 init_packet
->msg
.v1_msg
.send_recv_buf_complete
.sections
,
233 net_device
->recv_section_cnt
*
234 sizeof(struct nvsp_1_receive_buffer_section
),
236 if (net_device
->recv_section
== NULL
) {
242 * For 1st release, there should only be 1 section that represents the
243 * entire receive buffer
245 if (net_device
->recv_section_cnt
!= 1 ||
246 net_device
->recv_section
->offset
!= 0) {
254 netvsc_destroy_recv_buf(net_device
);
261 /* Negotiate NVSP protocol version */
262 static int negotiate_nvsp_ver(struct hv_device
*device
,
263 struct netvsc_device
*net_device
,
264 struct nvsp_message
*init_packet
,
269 memset(init_packet
, 0, sizeof(struct nvsp_message
));
270 init_packet
->hdr
.msg_type
= NVSP_MSG_TYPE_INIT
;
271 init_packet
->msg
.init_msg
.init
.min_protocol_ver
= nvsp_ver
;
272 init_packet
->msg
.init_msg
.init
.max_protocol_ver
= nvsp_ver
;
274 /* Send the init request */
275 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
276 sizeof(struct nvsp_message
),
277 (unsigned long)init_packet
,
279 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
284 t
= wait_for_completion_timeout(&net_device
->channel_init_wait
, 5*HZ
);
289 if (init_packet
->msg
.init_msg
.init_complete
.status
!=
293 if (nvsp_ver
== NVSP_PROTOCOL_VERSION_1
)
296 /* NVSPv2 only: Send NDIS config */
297 memset(init_packet
, 0, sizeof(struct nvsp_message
));
298 init_packet
->hdr
.msg_type
= NVSP_MSG2_TYPE_SEND_NDIS_CONFIG
;
299 init_packet
->msg
.v2_msg
.send_ndis_config
.mtu
= net_device
->ndev
->mtu
;
300 init_packet
->msg
.v2_msg
.send_ndis_config
.capability
.ieee8021q
= 1;
302 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
303 sizeof(struct nvsp_message
),
304 (unsigned long)init_packet
,
305 VM_PKT_DATA_INBAND
, 0);
310 static int netvsc_connect_vsp(struct hv_device
*device
)
313 struct netvsc_device
*net_device
;
314 struct nvsp_message
*init_packet
;
316 struct net_device
*ndev
;
317 u32 ver_list
[] = { NVSP_PROTOCOL_VERSION_1
, NVSP_PROTOCOL_VERSION_2
,
318 NVSP_PROTOCOL_VERSION_4
, NVSP_PROTOCOL_VERSION_5
};
319 int i
, num_ver
= 4; /* number of different NVSP versions */
321 net_device
= get_outbound_net_device(device
);
324 ndev
= net_device
->ndev
;
326 init_packet
= &net_device
->channel_init_pkt
;
328 /* Negotiate the latest NVSP protocol supported */
329 for (i
= num_ver
- 1; i
>= 0; i
--)
330 if (negotiate_nvsp_ver(device
, net_device
, init_packet
,
332 net_device
->nvsp_version
= ver_list
[i
];
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 if (net_device
->nvsp_version
<= NVSP_PROTOCOL_VERSION_4
)
347 ndis_version
= 0x00050001;
349 ndis_version
= 0x0006001e;
351 init_packet
->hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_NDIS_VER
;
352 init_packet
->msg
.v1_msg
.
353 send_ndis_ver
.ndis_major_ver
=
354 (ndis_version
& 0xFFFF0000) >> 16;
355 init_packet
->msg
.v1_msg
.
356 send_ndis_ver
.ndis_minor_ver
=
357 ndis_version
& 0xFFFF;
359 /* Send the init request */
360 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
361 sizeof(struct nvsp_message
),
362 (unsigned long)init_packet
,
363 VM_PKT_DATA_INBAND
, 0);
367 /* Post the big receive buffer to NetVSP */
368 ret
= netvsc_init_recv_buf(device
);
374 static void netvsc_disconnect_vsp(struct netvsc_device
*net_device
)
376 netvsc_destroy_recv_buf(net_device
);
380 * netvsc_device_remove - Callback when the root bus device is removed
382 int netvsc_device_remove(struct hv_device
*device
)
384 struct netvsc_device
*net_device
;
385 struct hv_netvsc_packet
*netvsc_packet
, *pos
;
388 net_device
= hv_get_drvdata(device
);
390 netvsc_disconnect_vsp(net_device
);
393 * Since we have already drained, we don't need to busy wait
394 * as was done in final_release_stor_device()
395 * Note that we cannot set the ext pointer to NULL until
396 * we have drained - to drain the outgoing packets, we need to
397 * allow incoming packets.
400 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
401 hv_set_drvdata(device
, NULL
);
402 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
405 * At this point, no one should be accessing net_device
408 dev_notice(&device
->device
, "net device safe to remove\n");
410 /* Now, we can close the channel safely */
411 vmbus_close(device
->channel
);
413 /* Release all resources */
414 list_for_each_entry_safe(netvsc_packet
, pos
,
415 &net_device
->recv_pkt_list
, list_ent
) {
416 list_del(&netvsc_packet
->list_ent
);
417 kfree(netvsc_packet
);
425 #define RING_AVAIL_PERCENT_HIWATER 20
426 #define RING_AVAIL_PERCENT_LOWATER 10
429 * Get the percentage of available bytes to write in the ring.
430 * The return value is in range from 0 to 100.
432 static inline u32
hv_ringbuf_avail_percent(
433 struct hv_ring_buffer_info
*ring_info
)
435 u32 avail_read
, avail_write
;
437 hv_get_ringbuffer_availbytes(ring_info
, &avail_read
, &avail_write
);
439 return avail_write
* 100 / ring_info
->ring_datasize
;
442 static void netvsc_send_completion(struct netvsc_device
*net_device
,
443 struct hv_device
*device
,
444 struct vmpacket_descriptor
*packet
)
446 struct nvsp_message
*nvsp_packet
;
447 struct hv_netvsc_packet
*nvsc_packet
;
448 struct net_device
*ndev
;
450 ndev
= net_device
->ndev
;
452 nvsp_packet
= (struct nvsp_message
*)((unsigned long)packet
+
453 (packet
->offset8
<< 3));
455 if ((nvsp_packet
->hdr
.msg_type
== NVSP_MSG_TYPE_INIT_COMPLETE
) ||
456 (nvsp_packet
->hdr
.msg_type
==
457 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE
) ||
458 (nvsp_packet
->hdr
.msg_type
==
459 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE
)) {
460 /* Copy the response back */
461 memcpy(&net_device
->channel_init_pkt
, nvsp_packet
,
462 sizeof(struct nvsp_message
));
463 complete(&net_device
->channel_init_wait
);
464 } else if (nvsp_packet
->hdr
.msg_type
==
465 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE
) {
466 int num_outstanding_sends
;
468 /* Get the send context */
469 nvsc_packet
= (struct hv_netvsc_packet
*)(unsigned long)
472 /* Notify the layer above us */
474 nvsc_packet
->completion
.send
.send_completion(
475 nvsc_packet
->completion
.send
.
476 send_completion_ctx
);
478 num_outstanding_sends
=
479 atomic_dec_return(&net_device
->num_outstanding_sends
);
481 if (net_device
->destroy
&& num_outstanding_sends
== 0)
482 wake_up(&net_device
->wait_drain
);
484 if (netif_queue_stopped(ndev
) && !net_device
->start_remove
&&
485 (hv_ringbuf_avail_percent(&device
->channel
->outbound
)
486 > RING_AVAIL_PERCENT_HIWATER
||
487 num_outstanding_sends
< 1))
488 netif_wake_queue(ndev
);
490 netdev_err(ndev
, "Unknown send completion packet type- "
491 "%d received!!\n", nvsp_packet
->hdr
.msg_type
);
496 int netvsc_send(struct hv_device
*device
,
497 struct hv_netvsc_packet
*packet
)
499 struct netvsc_device
*net_device
;
501 struct nvsp_message sendMessage
;
502 struct net_device
*ndev
;
505 net_device
= get_outbound_net_device(device
);
508 ndev
= net_device
->ndev
;
510 sendMessage
.hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_RNDIS_PKT
;
511 if (packet
->is_data_pkt
) {
513 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.channel_type
= 0;
515 /* 1 is RMC_CONTROL; */
516 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.channel_type
= 1;
519 /* Not using send buffer section */
520 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.send_buf_section_index
=
522 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.send_buf_section_size
= 0;
524 if (packet
->completion
.send
.send_completion
)
525 req_id
= (ulong
)packet
;
529 if (packet
->page_buf_cnt
) {
530 ret
= vmbus_sendpacket_pagebuffer(device
->channel
,
532 packet
->page_buf_cnt
,
534 sizeof(struct nvsp_message
),
537 ret
= vmbus_sendpacket(device
->channel
, &sendMessage
,
538 sizeof(struct nvsp_message
),
541 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
,
568 struct netvsc_device
*net_device
,
569 u64 transaction_id
, u32 status
)
571 struct nvsp_message recvcompMessage
;
574 struct net_device
*ndev
;
576 ndev
= net_device
->ndev
;
578 recvcompMessage
.hdr
.msg_type
=
579 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE
;
581 recvcompMessage
.msg
.v1_msg
.send_rndis_pkt_complete
.status
= status
;
584 /* Send the completion */
585 ret
= vmbus_sendpacket(device
->channel
, &recvcompMessage
,
586 sizeof(struct nvsp_message
), transaction_id
,
591 } else if (ret
== -EAGAIN
) {
592 /* no more room...wait a bit and attempt to retry 3 times */
594 netdev_err(ndev
, "unable to send receive completion pkt"
595 " (tid %llx)...retrying %d\n", transaction_id
, retries
);
599 goto retry_send_cmplt
;
601 netdev_err(ndev
, "unable to send receive "
602 "completion pkt (tid %llx)...give up retrying\n",
606 netdev_err(ndev
, "unable to send receive "
607 "completion pkt - %llx\n", transaction_id
);
611 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
612 static void netvsc_receive_completion(void *context
)
614 struct hv_netvsc_packet
*packet
= context
;
615 struct hv_device
*device
= packet
->device
;
616 struct netvsc_device
*net_device
;
617 u64 transaction_id
= 0;
618 bool fsend_receive_comp
= false;
620 struct net_device
*ndev
;
621 u32 status
= NVSP_STAT_NONE
;
624 * Even though it seems logical to do a GetOutboundNetDevice() here to
625 * send out receive completion, we are using GetInboundNetDevice()
626 * since we may have disable outbound traffic already.
628 net_device
= get_inbound_net_device(device
);
631 ndev
= net_device
->ndev
;
633 /* Overloading use of the lock. */
634 spin_lock_irqsave(&net_device
->recv_pkt_list_lock
, flags
);
636 if (packet
->status
!= NVSP_STAT_SUCCESS
)
637 packet
->xfer_page_pkt
->status
= NVSP_STAT_FAIL
;
639 packet
->xfer_page_pkt
->count
--;
642 * Last one in the line that represent 1 xfer page packet.
643 * Return the xfer page packet itself to the freelist
645 if (packet
->xfer_page_pkt
->count
== 0) {
646 fsend_receive_comp
= true;
647 transaction_id
= packet
->completion
.recv
.recv_completion_tid
;
648 status
= packet
->xfer_page_pkt
->status
;
649 list_add_tail(&packet
->xfer_page_pkt
->list_ent
,
650 &net_device
->recv_pkt_list
);
654 /* Put the packet back */
655 list_add_tail(&packet
->list_ent
, &net_device
->recv_pkt_list
);
656 spin_unlock_irqrestore(&net_device
->recv_pkt_list_lock
, flags
);
658 /* Send a receive completion for the xfer page packet */
659 if (fsend_receive_comp
)
660 netvsc_send_recv_completion(device
, net_device
, transaction_id
,
665 static void netvsc_receive(struct netvsc_device
*net_device
,
666 struct hv_device
*device
,
667 struct vmpacket_descriptor
*packet
)
669 struct vmtransfer_page_packet_header
*vmxferpage_packet
;
670 struct nvsp_message
*nvsp_packet
;
671 struct hv_netvsc_packet
*netvsc_packet
= NULL
;
672 /* struct netvsc_driver *netvscDriver; */
673 struct xferpage_packet
*xferpage_packet
= NULL
;
677 struct net_device
*ndev
;
681 ndev
= net_device
->ndev
;
684 * All inbound packets other than send completion should be xfer page
687 if (packet
->type
!= VM_PKT_DATA_USING_XFER_PAGES
) {
688 netdev_err(ndev
, "Unknown packet type received - %d\n",
693 nvsp_packet
= (struct nvsp_message
*)((unsigned long)packet
+
694 (packet
->offset8
<< 3));
696 /* Make sure this is a valid nvsp packet */
697 if (nvsp_packet
->hdr
.msg_type
!=
698 NVSP_MSG1_TYPE_SEND_RNDIS_PKT
) {
699 netdev_err(ndev
, "Unknown nvsp packet type received-"
700 " %d\n", nvsp_packet
->hdr
.msg_type
);
704 vmxferpage_packet
= (struct vmtransfer_page_packet_header
*)packet
;
706 if (vmxferpage_packet
->xfer_pageset_id
!= NETVSC_RECEIVE_BUFFER_ID
) {
707 netdev_err(ndev
, "Invalid xfer page set id - "
708 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID
,
709 vmxferpage_packet
->xfer_pageset_id
);
714 * Grab free packets (range count + 1) to represent this xfer
715 * page packet. +1 to represent the xfer page packet itself.
716 * We grab it here so that we know exactly how many we can
719 spin_lock_irqsave(&net_device
->recv_pkt_list_lock
, flags
);
720 while (!list_empty(&net_device
->recv_pkt_list
)) {
721 list_move_tail(net_device
->recv_pkt_list
.next
, &listHead
);
722 if (++count
== vmxferpage_packet
->range_cnt
+ 1)
725 spin_unlock_irqrestore(&net_device
->recv_pkt_list_lock
, flags
);
728 * We need at least 2 netvsc pkts (1 to represent the xfer
729 * page and at least 1 for the range) i.e. we can handled
730 * some of the xfer page packet ranges...
733 netdev_err(ndev
, "Got only %d netvsc pkt...needed "
734 "%d pkts. Dropping this xfer page packet completely!\n",
735 count
, vmxferpage_packet
->range_cnt
+ 1);
737 /* Return it to the freelist */
738 spin_lock_irqsave(&net_device
->recv_pkt_list_lock
, flags
);
739 for (i
= count
; i
!= 0; i
--) {
740 list_move_tail(listHead
.next
,
741 &net_device
->recv_pkt_list
);
743 spin_unlock_irqrestore(&net_device
->recv_pkt_list_lock
,
746 netvsc_send_recv_completion(device
, net_device
,
747 vmxferpage_packet
->d
.trans_id
,
753 /* Remove the 1st packet to represent the xfer page packet itself */
754 xferpage_packet
= (struct xferpage_packet
*)listHead
.next
;
755 list_del(&xferpage_packet
->list_ent
);
756 xferpage_packet
->status
= NVSP_STAT_SUCCESS
;
758 /* This is how much we can satisfy */
759 xferpage_packet
->count
= count
- 1;
761 if (xferpage_packet
->count
!= vmxferpage_packet
->range_cnt
) {
762 netdev_err(ndev
, "Needed %d netvsc pkts to satisfy "
763 "this xfer page...got %d\n",
764 vmxferpage_packet
->range_cnt
, xferpage_packet
->count
);
767 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
768 for (i
= 0; i
< (count
- 1); i
++) {
769 netvsc_packet
= (struct hv_netvsc_packet
*)listHead
.next
;
770 list_del(&netvsc_packet
->list_ent
);
772 /* Initialize the netvsc packet */
773 netvsc_packet
->status
= NVSP_STAT_SUCCESS
;
774 netvsc_packet
->xfer_page_pkt
= xferpage_packet
;
775 netvsc_packet
->completion
.recv
.recv_completion
=
776 netvsc_receive_completion
;
777 netvsc_packet
->completion
.recv
.recv_completion_ctx
=
779 netvsc_packet
->device
= device
;
780 /* Save this so that we can send it back */
781 netvsc_packet
->completion
.recv
.recv_completion_tid
=
782 vmxferpage_packet
->d
.trans_id
;
784 netvsc_packet
->data
= (void *)((unsigned long)net_device
->
785 recv_buf
+ vmxferpage_packet
->ranges
[i
].byte_offset
);
786 netvsc_packet
->total_data_buflen
=
787 vmxferpage_packet
->ranges
[i
].byte_count
;
789 /* Pass it to the upper layer */
790 rndis_filter_receive(device
, netvsc_packet
);
792 netvsc_receive_completion(netvsc_packet
->
793 completion
.recv
.recv_completion_ctx
);
798 static void netvsc_channel_cb(void *context
)
801 struct hv_device
*device
= context
;
802 struct netvsc_device
*net_device
;
805 struct vmpacket_descriptor
*desc
;
806 unsigned char *buffer
;
807 int bufferlen
= NETVSC_PACKET_SIZE
;
808 struct net_device
*ndev
;
810 net_device
= get_inbound_net_device(device
);
813 ndev
= net_device
->ndev
;
814 buffer
= net_device
->cb_buffer
;
817 ret
= vmbus_recvpacket_raw(device
->channel
, buffer
, bufferlen
,
818 &bytes_recvd
, &request_id
);
820 if (bytes_recvd
> 0) {
821 desc
= (struct vmpacket_descriptor
*)buffer
;
822 switch (desc
->type
) {
824 netvsc_send_completion(net_device
,
828 case VM_PKT_DATA_USING_XFER_PAGES
:
829 netvsc_receive(net_device
,
835 "unhandled packet type %d, "
837 desc
->type
, request_id
,
844 * We are done for this pass.
849 } else if (ret
== -ENOBUFS
) {
850 if (bufferlen
> NETVSC_PACKET_SIZE
)
852 /* Handle large packet */
853 buffer
= kmalloc(bytes_recvd
, GFP_ATOMIC
);
854 if (buffer
== NULL
) {
855 /* Try again next time around */
857 "unable to allocate buffer of size "
858 "(%d)!!\n", bytes_recvd
);
862 bufferlen
= bytes_recvd
;
866 if (bufferlen
> NETVSC_PACKET_SIZE
)
872 * netvsc_device_add - Callback when the device belonging to this
875 int netvsc_device_add(struct hv_device
*device
, void *additional_info
)
880 ((struct netvsc_device_info
*)additional_info
)->ring_size
;
881 struct netvsc_device
*net_device
;
882 struct hv_netvsc_packet
*packet
, *pos
;
883 struct net_device
*ndev
;
885 net_device
= alloc_net_device(device
);
892 * Coming into this function, struct net_device * is
893 * registered as the driver private data.
894 * In alloc_net_device(), we register struct netvsc_device *
895 * as the driver private data and stash away struct net_device *
896 * in struct netvsc_device *.
898 ndev
= net_device
->ndev
;
900 /* Initialize the NetVSC channel extension */
901 net_device
->recv_buf_size
= NETVSC_RECEIVE_BUFFER_SIZE
;
902 spin_lock_init(&net_device
->recv_pkt_list_lock
);
904 INIT_LIST_HEAD(&net_device
->recv_pkt_list
);
906 for (i
= 0; i
< NETVSC_RECEIVE_PACKETLIST_COUNT
; i
++) {
907 packet
= kzalloc(sizeof(struct hv_netvsc_packet
), GFP_KERNEL
);
911 list_add_tail(&packet
->list_ent
,
912 &net_device
->recv_pkt_list
);
914 init_completion(&net_device
->channel_init_wait
);
916 /* Open the channel */
917 ret
= vmbus_open(device
->channel
, ring_size
* PAGE_SIZE
,
918 ring_size
* PAGE_SIZE
, NULL
, 0,
919 netvsc_channel_cb
, device
);
922 netdev_err(ndev
, "unable to open channel: %d\n", ret
);
926 /* Channel is opened */
927 pr_info("hv_netvsc channel opened successfully\n");
929 /* Connect with the NetVsp */
930 ret
= netvsc_connect_vsp(device
);
933 "unable to connect to NetVSP - %d\n", ret
);
940 /* Now, we can close the channel safely */
941 vmbus_close(device
->channel
);
946 list_for_each_entry_safe(packet
, pos
,
947 &net_device
->recv_pkt_list
,
949 list_del(&packet
->list_ent
);