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 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);
385 spin_lock_irqsave(&device->channel->inbound_lock, flags);
386 net_device->destroy = true;
387 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
389 /* Wait for all send completions */
390 while (atomic_read(&net_device->num_outstanding_sends)) {
391 dev_info(&device->device,
392 "waiting for %d requests to complete...\n",
393 atomic_read(&net_device->num_outstanding_sends));
397 netvsc_disconnect_vsp(net_device);
400 * Since we have already drained, we don't need to busy wait
401 * as was done in final_release_stor_device()
402 * Note that we cannot set the ext pointer to NULL until
403 * we have drained - to drain the outgoing packets, we need to
404 * allow incoming packets.
407 spin_lock_irqsave(&device->channel->inbound_lock, flags);
408 hv_set_drvdata(device, NULL);
409 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
412 * At this point, no one should be accessing net_device
415 dev_notice(&device->device, "net device safe to remove\n");
417 /* Now, we can close the channel safely */
418 vmbus_close(device->channel);
420 /* Release all resources */
421 list_for_each_entry_safe(netvsc_packet, pos,
422 &net_device->recv_pkt_list, list_ent) {
423 list_del(&netvsc_packet->list_ent);
424 kfree(netvsc_packet);
432 #define RING_AVAIL_PERCENT_HIWATER 20
433 #define RING_AVAIL_PERCENT_LOWATER 10
436 * Get the percentage of available bytes to write in the ring.
437 * The return value is in range from 0 to 100.
439 static inline u32 hv_ringbuf_avail_percent(
440 struct hv_ring_buffer_info *ring_info)
442 u32 avail_read, avail_write;
444 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
446 return avail_write * 100 / ring_info->ring_datasize;
449 static void netvsc_send_completion(struct hv_device *device,
450 struct vmpacket_descriptor *packet)
452 struct netvsc_device *net_device;
453 struct nvsp_message *nvsp_packet;
454 struct hv_netvsc_packet *nvsc_packet;
455 struct net_device *ndev;
457 net_device = get_inbound_net_device(device);
460 ndev = net_device->ndev;
462 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
463 (packet->offset8 << 3));
465 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
466 (nvsp_packet->hdr.msg_type ==
467 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
468 (nvsp_packet->hdr.msg_type ==
469 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
470 /* Copy the response back */
471 memcpy(&net_device->channel_init_pkt, nvsp_packet,
472 sizeof(struct nvsp_message));
473 complete(&net_device->channel_init_wait);
474 } else if (nvsp_packet->hdr.msg_type ==
475 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
476 int num_outstanding_sends;
478 /* Get the send context */
479 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
482 /* Notify the layer above us */
483 nvsc_packet->completion.send.send_completion(
484 nvsc_packet->completion.send.send_completion_ctx);
486 num_outstanding_sends =
487 atomic_dec_return(&net_device->num_outstanding_sends);
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 = (struct hv_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);