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_2)
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;
318 net_device = get_outbound_net_device(device);
321 ndev = net_device->ndev;
323 init_packet = &net_device->channel_init_pkt;
325 /* Negotiate the latest NVSP protocol supported */
326 if (negotiate_nvsp_ver(device, net_device, init_packet,
327 NVSP_PROTOCOL_VERSION_2) == 0) {
328 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
329 } else if (negotiate_nvsp_ver(device, net_device, init_packet,
330 NVSP_PROTOCOL_VERSION_1) == 0) {
331 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
337 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
339 /* Send the ndis version */
340 memset(init_packet, 0, sizeof(struct nvsp_message));
342 ndis_version = 0x00050001;
344 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
345 init_packet->msg.v1_msg.
346 send_ndis_ver.ndis_major_ver =
347 (ndis_version & 0xFFFF0000) >> 16;
348 init_packet->msg.v1_msg.
349 send_ndis_ver.ndis_minor_ver =
350 ndis_version & 0xFFFF;
352 /* Send the init request */
353 ret = vmbus_sendpacket(device->channel, init_packet,
354 sizeof(struct nvsp_message),
355 (unsigned long)init_packet,
356 VM_PKT_DATA_INBAND, 0);
360 /* Post the big receive buffer to NetVSP */
361 ret = netvsc_init_recv_buf(device);
367 static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
369 netvsc_destroy_recv_buf(net_device);
373 * netvsc_device_remove - Callback when the root bus device is removed
375 int netvsc_device_remove(struct hv_device *device)
377 struct netvsc_device *net_device;
378 struct hv_netvsc_packet *netvsc_packet, *pos;
381 net_device = hv_get_drvdata(device);
383 netvsc_disconnect_vsp(net_device);
386 * Since we have already drained, we don't need to busy wait
387 * as was done in final_release_stor_device()
388 * Note that we cannot set the ext pointer to NULL until
389 * we have drained - to drain the outgoing packets, we need to
390 * allow incoming packets.
393 spin_lock_irqsave(&device->channel->inbound_lock, flags);
394 hv_set_drvdata(device, NULL);
395 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
398 * At this point, no one should be accessing net_device
401 dev_notice(&device->device, "net device safe to remove\n");
403 /* Now, we can close the channel safely */
404 vmbus_close(device->channel);
406 /* Release all resources */
407 list_for_each_entry_safe(netvsc_packet, pos,
408 &net_device->recv_pkt_list, list_ent) {
409 list_del(&netvsc_packet->list_ent);
410 kfree(netvsc_packet);
418 #define RING_AVAIL_PERCENT_HIWATER 20
419 #define RING_AVAIL_PERCENT_LOWATER 10
422 * Get the percentage of available bytes to write in the ring.
423 * The return value is in range from 0 to 100.
425 static inline u32 hv_ringbuf_avail_percent(
426 struct hv_ring_buffer_info *ring_info)
428 u32 avail_read, avail_write;
430 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
432 return avail_write * 100 / ring_info->ring_datasize;
435 static void netvsc_send_completion(struct hv_device *device,
436 struct vmpacket_descriptor *packet)
438 struct netvsc_device *net_device;
439 struct nvsp_message *nvsp_packet;
440 struct hv_netvsc_packet *nvsc_packet;
441 struct net_device *ndev;
443 net_device = get_inbound_net_device(device);
446 ndev = net_device->ndev;
448 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
449 (packet->offset8 << 3));
451 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
452 (nvsp_packet->hdr.msg_type ==
453 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
454 (nvsp_packet->hdr.msg_type ==
455 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
456 /* Copy the response back */
457 memcpy(&net_device->channel_init_pkt, nvsp_packet,
458 sizeof(struct nvsp_message));
459 complete(&net_device->channel_init_wait);
460 } else if (nvsp_packet->hdr.msg_type ==
461 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
462 int num_outstanding_sends;
464 /* Get the send context */
465 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
468 /* Notify the layer above us */
470 nvsc_packet->completion.send.send_completion(
471 nvsc_packet->completion.send.
472 send_completion_ctx);
474 num_outstanding_sends =
475 atomic_dec_return(&net_device->num_outstanding_sends);
477 if (net_device->destroy && num_outstanding_sends == 0)
478 wake_up(&net_device->wait_drain);
480 if (netif_queue_stopped(ndev) && !net_device->start_remove &&
481 (hv_ringbuf_avail_percent(&device->channel->outbound)
482 > RING_AVAIL_PERCENT_HIWATER ||
483 num_outstanding_sends < 1))
484 netif_wake_queue(ndev);
486 netdev_err(ndev, "Unknown send completion packet type- "
487 "%d received!!\n", nvsp_packet->hdr.msg_type);
492 int netvsc_send(struct hv_device *device,
493 struct hv_netvsc_packet *packet)
495 struct netvsc_device *net_device;
497 struct nvsp_message sendMessage;
498 struct net_device *ndev;
501 net_device = get_outbound_net_device(device);
504 ndev = net_device->ndev;
506 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
507 if (packet->is_data_pkt) {
509 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
511 /* 1 is RMC_CONTROL; */
512 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
515 /* Not using send buffer section */
516 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
518 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
520 if (packet->completion.send.send_completion)
521 req_id = (ulong)packet;
525 if (packet->page_buf_cnt) {
526 ret = vmbus_sendpacket_pagebuffer(device->channel,
528 packet->page_buf_cnt,
530 sizeof(struct nvsp_message),
533 ret = vmbus_sendpacket(device->channel, &sendMessage,
534 sizeof(struct nvsp_message),
537 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
541 atomic_inc(&net_device->num_outstanding_sends);
542 if (hv_ringbuf_avail_percent(&device->channel->outbound) <
543 RING_AVAIL_PERCENT_LOWATER) {
544 netif_stop_queue(ndev);
545 if (atomic_read(&net_device->
546 num_outstanding_sends) < 1)
547 netif_wake_queue(ndev);
549 } else if (ret == -EAGAIN) {
550 netif_stop_queue(ndev);
551 if (atomic_read(&net_device->num_outstanding_sends) < 1) {
552 netif_wake_queue(ndev);
556 netdev_err(ndev, "Unable to send packet %p ret %d\n",
563 static void netvsc_send_recv_completion(struct hv_device *device,
564 u64 transaction_id, u32 status)
566 struct nvsp_message recvcompMessage;
569 struct net_device *ndev;
570 struct netvsc_device *net_device = hv_get_drvdata(device);
572 ndev = net_device->ndev;
574 recvcompMessage.hdr.msg_type =
575 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
577 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
580 /* Send the completion */
581 ret = vmbus_sendpacket(device->channel, &recvcompMessage,
582 sizeof(struct nvsp_message), transaction_id,
587 } else if (ret == -EAGAIN) {
588 /* no more room...wait a bit and attempt to retry 3 times */
590 netdev_err(ndev, "unable to send receive completion pkt"
591 " (tid %llx)...retrying %d\n", transaction_id, retries);
595 goto retry_send_cmplt;
597 netdev_err(ndev, "unable to send receive "
598 "completion pkt (tid %llx)...give up retrying\n",
602 netdev_err(ndev, "unable to send receive "
603 "completion pkt - %llx\n", transaction_id);
607 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
608 static void netvsc_receive_completion(void *context)
610 struct hv_netvsc_packet *packet = context;
611 struct hv_device *device = packet->device;
612 struct netvsc_device *net_device;
613 u64 transaction_id = 0;
614 bool fsend_receive_comp = false;
616 struct net_device *ndev;
617 u32 status = NVSP_STAT_NONE;
620 * Even though it seems logical to do a GetOutboundNetDevice() here to
621 * send out receive completion, we are using GetInboundNetDevice()
622 * since we may have disable outbound traffic already.
624 net_device = get_inbound_net_device(device);
627 ndev = net_device->ndev;
629 /* Overloading use of the lock. */
630 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
632 if (packet->status != NVSP_STAT_SUCCESS)
633 packet->xfer_page_pkt->status = NVSP_STAT_FAIL;
635 packet->xfer_page_pkt->count--;
638 * Last one in the line that represent 1 xfer page packet.
639 * Return the xfer page packet itself to the freelist
641 if (packet->xfer_page_pkt->count == 0) {
642 fsend_receive_comp = true;
643 transaction_id = packet->completion.recv.recv_completion_tid;
644 status = packet->xfer_page_pkt->status;
645 list_add_tail(&packet->xfer_page_pkt->list_ent,
646 &net_device->recv_pkt_list);
650 /* Put the packet back */
651 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
652 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
654 /* Send a receive completion for the xfer page packet */
655 if (fsend_receive_comp)
656 netvsc_send_recv_completion(device, transaction_id, status);
660 static void netvsc_receive(struct hv_device *device,
661 struct vmpacket_descriptor *packet)
663 struct netvsc_device *net_device;
664 struct vmtransfer_page_packet_header *vmxferpage_packet;
665 struct nvsp_message *nvsp_packet;
666 struct hv_netvsc_packet *netvsc_packet = NULL;
667 /* struct netvsc_driver *netvscDriver; */
668 struct xferpage_packet *xferpage_packet = NULL;
672 struct net_device *ndev;
676 net_device = get_inbound_net_device(device);
679 ndev = net_device->ndev;
682 * All inbound packets other than send completion should be xfer page
685 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
686 netdev_err(ndev, "Unknown packet type received - %d\n",
691 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
692 (packet->offset8 << 3));
694 /* Make sure this is a valid nvsp packet */
695 if (nvsp_packet->hdr.msg_type !=
696 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
697 netdev_err(ndev, "Unknown nvsp packet type received-"
698 " %d\n", nvsp_packet->hdr.msg_type);
702 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
704 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
705 netdev_err(ndev, "Invalid xfer page set id - "
706 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
707 vmxferpage_packet->xfer_pageset_id);
712 * Grab free packets (range count + 1) to represent this xfer
713 * page packet. +1 to represent the xfer page packet itself.
714 * We grab it here so that we know exactly how many we can
717 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
718 while (!list_empty(&net_device->recv_pkt_list)) {
719 list_move_tail(net_device->recv_pkt_list.next, &listHead);
720 if (++count == vmxferpage_packet->range_cnt + 1)
723 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
726 * We need at least 2 netvsc pkts (1 to represent the xfer
727 * page and at least 1 for the range) i.e. we can handled
728 * some of the xfer page packet ranges...
731 netdev_err(ndev, "Got only %d netvsc pkt...needed "
732 "%d pkts. Dropping this xfer page packet completely!\n",
733 count, vmxferpage_packet->range_cnt + 1);
735 /* Return it to the freelist */
736 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
737 for (i = count; i != 0; i--) {
738 list_move_tail(listHead.next,
739 &net_device->recv_pkt_list);
741 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
744 netvsc_send_recv_completion(device,
745 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);
754 xferpage_packet->status = NVSP_STAT_SUCCESS;
756 /* This is how much we can satisfy */
757 xferpage_packet->count = count - 1;
759 if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
760 netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
761 "this xfer page...got %d\n",
762 vmxferpage_packet->range_cnt, xferpage_packet->count);
765 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
766 for (i = 0; i < (count - 1); i++) {
767 netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
768 list_del(&netvsc_packet->list_ent);
770 /* Initialize the netvsc packet */
771 netvsc_packet->status = NVSP_STAT_SUCCESS;
772 netvsc_packet->xfer_page_pkt = xferpage_packet;
773 netvsc_packet->completion.recv.recv_completion =
774 netvsc_receive_completion;
775 netvsc_packet->completion.recv.recv_completion_ctx =
777 netvsc_packet->device = device;
778 /* Save this so that we can send it back */
779 netvsc_packet->completion.recv.recv_completion_tid =
780 vmxferpage_packet->d.trans_id;
782 netvsc_packet->data = (void *)((unsigned long)net_device->
783 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
784 netvsc_packet->total_data_buflen =
785 vmxferpage_packet->ranges[i].byte_count;
787 /* Pass it to the upper layer */
788 rndis_filter_receive(device, netvsc_packet);
790 netvsc_receive_completion(netvsc_packet->
791 completion.recv.recv_completion_ctx);
796 static void netvsc_channel_cb(void *context)
799 struct hv_device *device = context;
800 struct netvsc_device *net_device;
803 unsigned char *packet;
804 struct vmpacket_descriptor *desc;
805 unsigned char *buffer;
806 int bufferlen = NETVSC_PACKET_SIZE;
807 struct net_device *ndev;
809 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
815 net_device = get_inbound_net_device(device);
818 ndev = net_device->ndev;
821 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
822 &bytes_recvd, &request_id);
824 if (bytes_recvd > 0) {
825 desc = (struct vmpacket_descriptor *)buffer;
826 switch (desc->type) {
828 netvsc_send_completion(device, desc);
831 case VM_PKT_DATA_USING_XFER_PAGES:
832 netvsc_receive(device, desc);
837 "unhandled packet type %d, "
839 desc->type, request_id,
845 if (bufferlen > NETVSC_PACKET_SIZE) {
848 bufferlen = NETVSC_PACKET_SIZE;
852 if (bufferlen > NETVSC_PACKET_SIZE) {
855 bufferlen = NETVSC_PACKET_SIZE;
860 } else if (ret == -ENOBUFS) {
861 /* Handle large packet */
862 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
863 if (buffer == NULL) {
864 /* Try again next time around */
866 "unable to allocate buffer of size "
867 "(%d)!!\n", bytes_recvd);
871 bufferlen = bytes_recvd;
881 * netvsc_device_add - Callback when the device belonging to this
884 int netvsc_device_add(struct hv_device *device, void *additional_info)
889 ((struct netvsc_device_info *)additional_info)->ring_size;
890 struct netvsc_device *net_device;
891 struct hv_netvsc_packet *packet, *pos;
892 struct net_device *ndev;
894 net_device = alloc_net_device(device);
901 * Coming into this function, struct net_device * is
902 * registered as the driver private data.
903 * In alloc_net_device(), we register struct netvsc_device *
904 * as the driver private data and stash away struct net_device *
905 * in struct netvsc_device *.
907 ndev = net_device->ndev;
909 /* Initialize the NetVSC channel extension */
910 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
911 spin_lock_init(&net_device->recv_pkt_list_lock);
913 INIT_LIST_HEAD(&net_device->recv_pkt_list);
915 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
916 packet = kzalloc(sizeof(struct hv_netvsc_packet), 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);