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 free_pages((unsigned long)net_device->recv_buf,
140 get_order(net_device->recv_buf_size));
141 net_device->recv_buf = NULL;
144 if (net_device->recv_section) {
145 net_device->recv_section_cnt = 0;
146 kfree(net_device->recv_section);
147 net_device->recv_section = NULL;
153 static int netvsc_init_recv_buf(struct hv_device *device)
157 struct netvsc_device *net_device;
158 struct nvsp_message *init_packet;
159 struct net_device *ndev;
161 net_device = get_outbound_net_device(device);
164 ndev = net_device->ndev;
166 net_device->recv_buf =
167 (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
168 get_order(net_device->recv_buf_size));
169 if (!net_device->recv_buf) {
170 netdev_err(ndev, "unable to allocate receive "
171 "buffer of size %d\n", net_device->recv_buf_size);
177 * Establish the gpadl handle for this buffer on this
178 * channel. Note: This call uses the vmbus connection rather
179 * than the channel to establish the gpadl handle.
181 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
182 net_device->recv_buf_size,
183 &net_device->recv_buf_gpadl_handle);
186 "unable to establish receive buffer's gpadl\n");
191 /* Notify the NetVsp of the gpadl handle */
192 init_packet = &net_device->channel_init_pkt;
194 memset(init_packet, 0, sizeof(struct nvsp_message));
196 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
197 init_packet->msg.v1_msg.send_recv_buf.
198 gpadl_handle = net_device->recv_buf_gpadl_handle;
199 init_packet->msg.v1_msg.
200 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
202 /* Send the gpadl notification request */
203 ret = vmbus_sendpacket(device->channel, init_packet,
204 sizeof(struct nvsp_message),
205 (unsigned long)init_packet,
207 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
210 "unable to send receive buffer's gpadl to netvsp\n");
214 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
218 /* Check the response */
219 if (init_packet->msg.v1_msg.
220 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
221 netdev_err(ndev, "Unable to complete receive buffer "
222 "initialization with NetVsp - status %d\n",
223 init_packet->msg.v1_msg.
224 send_recv_buf_complete.status);
229 /* Parse the response */
231 net_device->recv_section_cnt = init_packet->msg.
232 v1_msg.send_recv_buf_complete.num_sections;
234 net_device->recv_section = kmemdup(
235 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
236 net_device->recv_section_cnt *
237 sizeof(struct nvsp_1_receive_buffer_section),
239 if (net_device->recv_section == NULL) {
245 * For 1st release, there should only be 1 section that represents the
246 * entire receive buffer
248 if (net_device->recv_section_cnt != 1 ||
249 net_device->recv_section->offset != 0) {
257 netvsc_destroy_recv_buf(net_device);
264 /* Negotiate NVSP protocol version */
265 static int negotiate_nvsp_ver(struct hv_device *device,
266 struct netvsc_device *net_device,
267 struct nvsp_message *init_packet,
272 memset(init_packet, 0, sizeof(struct nvsp_message));
273 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
274 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
275 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
277 /* Send the init request */
278 ret = vmbus_sendpacket(device->channel, init_packet,
279 sizeof(struct nvsp_message),
280 (unsigned long)init_packet,
282 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
287 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
292 if (init_packet->msg.init_msg.init_complete.status !=
296 if (nvsp_ver != NVSP_PROTOCOL_VERSION_2)
299 /* NVSPv2 only: Send NDIS config */
300 memset(init_packet, 0, sizeof(struct nvsp_message));
301 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
302 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu;
303 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
305 ret = vmbus_sendpacket(device->channel, init_packet,
306 sizeof(struct nvsp_message),
307 (unsigned long)init_packet,
308 VM_PKT_DATA_INBAND, 0);
313 static int netvsc_connect_vsp(struct hv_device *device)
316 struct netvsc_device *net_device;
317 struct nvsp_message *init_packet;
319 struct net_device *ndev;
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 if (negotiate_nvsp_ver(device, net_device, init_packet,
330 NVSP_PROTOCOL_VERSION_2) == 0) {
331 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
332 } else if (negotiate_nvsp_ver(device, net_device, init_packet,
333 NVSP_PROTOCOL_VERSION_1) == 0) {
334 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
340 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
342 /* Send the ndis version */
343 memset(init_packet, 0, sizeof(struct nvsp_message));
345 ndis_version = 0x00050001;
347 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
348 init_packet->msg.v1_msg.
349 send_ndis_ver.ndis_major_ver =
350 (ndis_version & 0xFFFF0000) >> 16;
351 init_packet->msg.v1_msg.
352 send_ndis_ver.ndis_minor_ver =
353 ndis_version & 0xFFFF;
355 /* Send the init request */
356 ret = vmbus_sendpacket(device->channel, init_packet,
357 sizeof(struct nvsp_message),
358 (unsigned long)init_packet,
359 VM_PKT_DATA_INBAND, 0);
363 /* Post the big receive buffer to NetVSP */
364 ret = netvsc_init_recv_buf(device);
370 static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
372 netvsc_destroy_recv_buf(net_device);
376 * netvsc_device_remove - Callback when the root bus device is removed
378 int netvsc_device_remove(struct hv_device *device)
380 struct netvsc_device *net_device;
381 struct hv_netvsc_packet *netvsc_packet, *pos;
384 net_device = hv_get_drvdata(device);
386 netvsc_disconnect_vsp(net_device);
389 * Since we have already drained, we don't need to busy wait
390 * as was done in final_release_stor_device()
391 * Note that we cannot set the ext pointer to NULL until
392 * we have drained - to drain the outgoing packets, we need to
393 * allow incoming packets.
396 spin_lock_irqsave(&device->channel->inbound_lock, flags);
397 hv_set_drvdata(device, NULL);
398 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
401 * At this point, no one should be accessing net_device
404 dev_notice(&device->device, "net device safe to remove\n");
406 /* Now, we can close the channel safely */
407 vmbus_close(device->channel);
409 /* Release all resources */
410 list_for_each_entry_safe(netvsc_packet, pos,
411 &net_device->recv_pkt_list, list_ent) {
412 list_del(&netvsc_packet->list_ent);
413 kfree(netvsc_packet);
421 #define RING_AVAIL_PERCENT_HIWATER 20
422 #define RING_AVAIL_PERCENT_LOWATER 10
425 * Get the percentage of available bytes to write in the ring.
426 * The return value is in range from 0 to 100.
428 static inline u32 hv_ringbuf_avail_percent(
429 struct hv_ring_buffer_info *ring_info)
431 u32 avail_read, avail_write;
433 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
435 return avail_write * 100 / ring_info->ring_datasize;
438 static void netvsc_send_completion(struct hv_device *device,
439 struct vmpacket_descriptor *packet)
441 struct netvsc_device *net_device;
442 struct nvsp_message *nvsp_packet;
443 struct hv_netvsc_packet *nvsc_packet;
444 struct net_device *ndev;
446 net_device = get_inbound_net_device(device);
449 ndev = net_device->ndev;
451 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
452 (packet->offset8 << 3));
454 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
455 (nvsp_packet->hdr.msg_type ==
456 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
457 (nvsp_packet->hdr.msg_type ==
458 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
459 /* Copy the response back */
460 memcpy(&net_device->channel_init_pkt, nvsp_packet,
461 sizeof(struct nvsp_message));
462 complete(&net_device->channel_init_wait);
463 } else if (nvsp_packet->hdr.msg_type ==
464 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
465 int num_outstanding_sends;
467 /* Get the send context */
468 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
471 /* Notify the layer above us */
473 nvsc_packet->completion.send.send_completion(
474 nvsc_packet->completion.send.
475 send_completion_ctx);
477 num_outstanding_sends =
478 atomic_dec_return(&net_device->num_outstanding_sends);
480 if (net_device->destroy && num_outstanding_sends == 0)
481 wake_up(&net_device->wait_drain);
483 if (netif_queue_stopped(ndev) && !net_device->start_remove &&
484 (hv_ringbuf_avail_percent(&device->channel->outbound)
485 > RING_AVAIL_PERCENT_HIWATER ||
486 num_outstanding_sends < 1))
487 netif_wake_queue(ndev);
489 netdev_err(ndev, "Unknown send completion packet type- "
490 "%d received!!\n", nvsp_packet->hdr.msg_type);
495 int netvsc_send(struct hv_device *device,
496 struct hv_netvsc_packet *packet)
498 struct netvsc_device *net_device;
500 struct nvsp_message sendMessage;
501 struct net_device *ndev;
504 net_device = get_outbound_net_device(device);
507 ndev = net_device->ndev;
509 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
510 if (packet->is_data_pkt) {
512 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
514 /* 1 is RMC_CONTROL; */
515 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
518 /* Not using send buffer section */
519 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
521 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
523 if (packet->completion.send.send_completion)
524 req_id = (ulong)packet;
528 if (packet->page_buf_cnt) {
529 ret = vmbus_sendpacket_pagebuffer(device->channel,
531 packet->page_buf_cnt,
533 sizeof(struct nvsp_message),
536 ret = vmbus_sendpacket(device->channel, &sendMessage,
537 sizeof(struct nvsp_message),
540 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
544 atomic_inc(&net_device->num_outstanding_sends);
545 if (hv_ringbuf_avail_percent(&device->channel->outbound) <
546 RING_AVAIL_PERCENT_LOWATER) {
547 netif_stop_queue(ndev);
548 if (atomic_read(&net_device->
549 num_outstanding_sends) < 1)
550 netif_wake_queue(ndev);
552 } else if (ret == -EAGAIN) {
553 netif_stop_queue(ndev);
554 if (atomic_read(&net_device->num_outstanding_sends) < 1) {
555 netif_wake_queue(ndev);
559 netdev_err(ndev, "Unable to send packet %p ret %d\n",
566 static void netvsc_send_recv_completion(struct hv_device *device,
567 u64 transaction_id, u32 status)
569 struct nvsp_message recvcompMessage;
572 struct net_device *ndev;
573 struct netvsc_device *net_device = hv_get_drvdata(device);
575 ndev = net_device->ndev;
577 recvcompMessage.hdr.msg_type =
578 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
580 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
583 /* Send the completion */
584 ret = vmbus_sendpacket(device->channel, &recvcompMessage,
585 sizeof(struct nvsp_message), transaction_id,
590 } else if (ret == -EAGAIN) {
591 /* no more room...wait a bit and attempt to retry 3 times */
593 netdev_err(ndev, "unable to send receive completion pkt"
594 " (tid %llx)...retrying %d\n", transaction_id, retries);
598 goto retry_send_cmplt;
600 netdev_err(ndev, "unable to send receive "
601 "completion pkt (tid %llx)...give up retrying\n",
605 netdev_err(ndev, "unable to send receive "
606 "completion pkt - %llx\n", transaction_id);
610 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
611 static void netvsc_receive_completion(void *context)
613 struct hv_netvsc_packet *packet = context;
614 struct hv_device *device = packet->device;
615 struct netvsc_device *net_device;
616 u64 transaction_id = 0;
617 bool fsend_receive_comp = false;
619 struct net_device *ndev;
620 u32 status = NVSP_STAT_NONE;
623 * Even though it seems logical to do a GetOutboundNetDevice() here to
624 * send out receive completion, we are using GetInboundNetDevice()
625 * since we may have disable outbound traffic already.
627 net_device = get_inbound_net_device(device);
630 ndev = net_device->ndev;
632 /* Overloading use of the lock. */
633 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
635 if (packet->status != NVSP_STAT_SUCCESS)
636 packet->xfer_page_pkt->status = NVSP_STAT_FAIL;
638 packet->xfer_page_pkt->count--;
641 * Last one in the line that represent 1 xfer page packet.
642 * Return the xfer page packet itself to the freelist
644 if (packet->xfer_page_pkt->count == 0) {
645 fsend_receive_comp = true;
646 transaction_id = packet->completion.recv.recv_completion_tid;
647 status = packet->xfer_page_pkt->status;
648 list_add_tail(&packet->xfer_page_pkt->list_ent,
649 &net_device->recv_pkt_list);
653 /* Put the packet back */
654 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
655 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
657 /* Send a receive completion for the xfer page packet */
658 if (fsend_receive_comp)
659 netvsc_send_recv_completion(device, transaction_id, status);
663 static void netvsc_receive(struct hv_device *device,
664 struct vmpacket_descriptor *packet)
666 struct netvsc_device *net_device;
667 struct vmtransfer_page_packet_header *vmxferpage_packet;
668 struct nvsp_message *nvsp_packet;
669 struct hv_netvsc_packet *netvsc_packet = NULL;
670 /* struct netvsc_driver *netvscDriver; */
671 struct xferpage_packet *xferpage_packet = NULL;
675 struct net_device *ndev;
679 net_device = get_inbound_net_device(device);
682 ndev = net_device->ndev;
685 * All inbound packets other than send completion should be xfer page
688 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
689 netdev_err(ndev, "Unknown packet type received - %d\n",
694 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
695 (packet->offset8 << 3));
697 /* Make sure this is a valid nvsp packet */
698 if (nvsp_packet->hdr.msg_type !=
699 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
700 netdev_err(ndev, "Unknown nvsp packet type received-"
701 " %d\n", nvsp_packet->hdr.msg_type);
705 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
707 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
708 netdev_err(ndev, "Invalid xfer page set id - "
709 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
710 vmxferpage_packet->xfer_pageset_id);
715 * Grab free packets (range count + 1) to represent this xfer
716 * page packet. +1 to represent the xfer page packet itself.
717 * We grab it here so that we know exactly how many we can
720 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
721 while (!list_empty(&net_device->recv_pkt_list)) {
722 list_move_tail(net_device->recv_pkt_list.next, &listHead);
723 if (++count == vmxferpage_packet->range_cnt + 1)
726 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
729 * We need at least 2 netvsc pkts (1 to represent the xfer
730 * page and at least 1 for the range) i.e. we can handled
731 * some of the xfer page packet ranges...
734 netdev_err(ndev, "Got only %d netvsc pkt...needed "
735 "%d pkts. Dropping this xfer page packet completely!\n",
736 count, vmxferpage_packet->range_cnt + 1);
738 /* Return it to the freelist */
739 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
740 for (i = count; i != 0; i--) {
741 list_move_tail(listHead.next,
742 &net_device->recv_pkt_list);
744 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
747 netvsc_send_recv_completion(device,
748 vmxferpage_packet->d.trans_id,
754 /* Remove the 1st packet to represent the xfer page packet itself */
755 xferpage_packet = (struct xferpage_packet *)listHead.next;
756 list_del(&xferpage_packet->list_ent);
757 xferpage_packet->status = NVSP_STAT_SUCCESS;
759 /* This is how much we can satisfy */
760 xferpage_packet->count = count - 1;
762 if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
763 netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
764 "this xfer page...got %d\n",
765 vmxferpage_packet->range_cnt, xferpage_packet->count);
768 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
769 for (i = 0; i < (count - 1); i++) {
770 netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
771 list_del(&netvsc_packet->list_ent);
773 /* Initialize the netvsc packet */
774 netvsc_packet->status = NVSP_STAT_SUCCESS;
775 netvsc_packet->xfer_page_pkt = xferpage_packet;
776 netvsc_packet->completion.recv.recv_completion =
777 netvsc_receive_completion;
778 netvsc_packet->completion.recv.recv_completion_ctx =
780 netvsc_packet->device = device;
781 /* Save this so that we can send it back */
782 netvsc_packet->completion.recv.recv_completion_tid =
783 vmxferpage_packet->d.trans_id;
785 netvsc_packet->data = (void *)((unsigned long)net_device->
786 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
787 netvsc_packet->total_data_buflen =
788 vmxferpage_packet->ranges[i].byte_count;
790 /* Pass it to the upper layer */
791 rndis_filter_receive(device, netvsc_packet);
793 netvsc_receive_completion(netvsc_packet->
794 completion.recv.recv_completion_ctx);
799 static void netvsc_channel_cb(void *context)
802 struct hv_device *device = context;
803 struct netvsc_device *net_device;
806 unsigned char *packet;
807 struct vmpacket_descriptor *desc;
808 unsigned char *buffer;
809 int bufferlen = NETVSC_PACKET_SIZE;
810 struct net_device *ndev;
812 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
818 net_device = get_inbound_net_device(device);
821 ndev = net_device->ndev;
824 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
825 &bytes_recvd, &request_id);
827 if (bytes_recvd > 0) {
828 desc = (struct vmpacket_descriptor *)buffer;
829 switch (desc->type) {
831 netvsc_send_completion(device, desc);
834 case VM_PKT_DATA_USING_XFER_PAGES:
835 netvsc_receive(device, desc);
840 "unhandled packet type %d, "
842 desc->type, request_id,
848 if (bufferlen > NETVSC_PACKET_SIZE) {
851 bufferlen = NETVSC_PACKET_SIZE;
855 if (bufferlen > NETVSC_PACKET_SIZE) {
858 bufferlen = NETVSC_PACKET_SIZE;
863 } else if (ret == -ENOBUFS) {
864 /* Handle large packet */
865 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
866 if (buffer == NULL) {
867 /* Try again next time around */
869 "unable to allocate buffer of size "
870 "(%d)!!\n", bytes_recvd);
874 bufferlen = bytes_recvd;
884 * netvsc_device_add - Callback when the device belonging to this
887 int netvsc_device_add(struct hv_device *device, void *additional_info)
892 ((struct netvsc_device_info *)additional_info)->ring_size;
893 struct netvsc_device *net_device;
894 struct hv_netvsc_packet *packet, *pos;
895 struct net_device *ndev;
897 net_device = alloc_net_device(device);
904 * Coming into this function, struct net_device * is
905 * registered as the driver private data.
906 * In alloc_net_device(), we register struct netvsc_device *
907 * as the driver private data and stash away struct net_device *
908 * in struct netvsc_device *.
910 ndev = net_device->ndev;
912 /* Initialize the NetVSC channel extension */
913 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
914 spin_lock_init(&net_device->recv_pkt_list_lock);
916 INIT_LIST_HEAD(&net_device->recv_pkt_list);
918 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
919 packet = kzalloc(sizeof(struct hv_netvsc_packet), GFP_KERNEL);
923 list_add_tail(&packet->list_ent,
924 &net_device->recv_pkt_list);
926 init_completion(&net_device->channel_init_wait);
928 /* Open the channel */
929 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
930 ring_size * PAGE_SIZE, NULL, 0,
931 netvsc_channel_cb, device);
934 netdev_err(ndev, "unable to open channel: %d\n", ret);
938 /* Channel is opened */
939 pr_info("hv_netvsc channel opened successfully\n");
941 /* Connect with the NetVsp */
942 ret = netvsc_connect_vsp(device);
945 "unable to connect to NetVSP - %d\n", ret);
952 /* Now, we can close the channel safely */
953 vmbus_close(device->channel);
958 list_for_each_entry_safe(packet, pos,
959 &net_device->recv_pkt_list,
961 list_del(&packet->list_ent);