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 netvsc_device *net_device,
436 struct hv_device *device,
437 struct vmpacket_descriptor *packet)
439 struct nvsp_message *nvsp_packet;
440 struct hv_netvsc_packet *nvsc_packet;
441 struct net_device *ndev;
443 ndev = net_device->ndev;
445 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
446 (packet->offset8 << 3));
448 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
449 (nvsp_packet->hdr.msg_type ==
450 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
451 (nvsp_packet->hdr.msg_type ==
452 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
453 /* Copy the response back */
454 memcpy(&net_device->channel_init_pkt, nvsp_packet,
455 sizeof(struct nvsp_message));
456 complete(&net_device->channel_init_wait);
457 } else if (nvsp_packet->hdr.msg_type ==
458 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
459 int num_outstanding_sends;
461 /* Get the send context */
462 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
465 /* Notify the layer above us */
467 nvsc_packet->completion.send.send_completion(
468 nvsc_packet->completion.send.
469 send_completion_ctx);
471 num_outstanding_sends =
472 atomic_dec_return(&net_device->num_outstanding_sends);
474 if (net_device->destroy && num_outstanding_sends == 0)
475 wake_up(&net_device->wait_drain);
477 if (netif_queue_stopped(ndev) && !net_device->start_remove &&
478 (hv_ringbuf_avail_percent(&device->channel->outbound)
479 > RING_AVAIL_PERCENT_HIWATER ||
480 num_outstanding_sends < 1))
481 netif_wake_queue(ndev);
483 netdev_err(ndev, "Unknown send completion packet type- "
484 "%d received!!\n", nvsp_packet->hdr.msg_type);
489 int netvsc_send(struct hv_device *device,
490 struct hv_netvsc_packet *packet)
492 struct netvsc_device *net_device;
494 struct nvsp_message sendMessage;
495 struct net_device *ndev;
498 net_device = get_outbound_net_device(device);
501 ndev = net_device->ndev;
503 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
504 if (packet->is_data_pkt) {
506 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
508 /* 1 is RMC_CONTROL; */
509 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
512 /* Not using send buffer section */
513 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
515 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
517 if (packet->completion.send.send_completion)
518 req_id = (ulong)packet;
522 if (packet->page_buf_cnt) {
523 ret = vmbus_sendpacket_pagebuffer(device->channel,
525 packet->page_buf_cnt,
527 sizeof(struct nvsp_message),
530 ret = vmbus_sendpacket(device->channel, &sendMessage,
531 sizeof(struct nvsp_message),
534 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
538 atomic_inc(&net_device->num_outstanding_sends);
539 if (hv_ringbuf_avail_percent(&device->channel->outbound) <
540 RING_AVAIL_PERCENT_LOWATER) {
541 netif_stop_queue(ndev);
542 if (atomic_read(&net_device->
543 num_outstanding_sends) < 1)
544 netif_wake_queue(ndev);
546 } else if (ret == -EAGAIN) {
547 netif_stop_queue(ndev);
548 if (atomic_read(&net_device->num_outstanding_sends) < 1) {
549 netif_wake_queue(ndev);
553 netdev_err(ndev, "Unable to send packet %p ret %d\n",
560 static void netvsc_send_recv_completion(struct hv_device *device,
561 struct netvsc_device *net_device,
562 u64 transaction_id, u32 status)
564 struct nvsp_message recvcompMessage;
567 struct net_device *ndev;
569 ndev = net_device->ndev;
571 recvcompMessage.hdr.msg_type =
572 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
574 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
577 /* Send the completion */
578 ret = vmbus_sendpacket(device->channel, &recvcompMessage,
579 sizeof(struct nvsp_message), transaction_id,
584 } else if (ret == -EAGAIN) {
585 /* no more room...wait a bit and attempt to retry 3 times */
587 netdev_err(ndev, "unable to send receive completion pkt"
588 " (tid %llx)...retrying %d\n", transaction_id, retries);
592 goto retry_send_cmplt;
594 netdev_err(ndev, "unable to send receive "
595 "completion pkt (tid %llx)...give up retrying\n",
599 netdev_err(ndev, "unable to send receive "
600 "completion pkt - %llx\n", transaction_id);
604 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
605 static void netvsc_receive_completion(void *context)
607 struct hv_netvsc_packet *packet = context;
608 struct hv_device *device = packet->device;
609 struct netvsc_device *net_device;
610 u64 transaction_id = 0;
611 bool fsend_receive_comp = false;
613 struct net_device *ndev;
614 u32 status = NVSP_STAT_NONE;
617 * Even though it seems logical to do a GetOutboundNetDevice() here to
618 * send out receive completion, we are using GetInboundNetDevice()
619 * since we may have disable outbound traffic already.
621 net_device = get_inbound_net_device(device);
624 ndev = net_device->ndev;
626 /* Overloading use of the lock. */
627 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
629 if (packet->status != NVSP_STAT_SUCCESS)
630 packet->xfer_page_pkt->status = NVSP_STAT_FAIL;
632 packet->xfer_page_pkt->count--;
635 * Last one in the line that represent 1 xfer page packet.
636 * Return the xfer page packet itself to the freelist
638 if (packet->xfer_page_pkt->count == 0) {
639 fsend_receive_comp = true;
640 transaction_id = packet->completion.recv.recv_completion_tid;
641 status = packet->xfer_page_pkt->status;
642 list_add_tail(&packet->xfer_page_pkt->list_ent,
643 &net_device->recv_pkt_list);
647 /* Put the packet back */
648 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
649 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
651 /* Send a receive completion for the xfer page packet */
652 if (fsend_receive_comp)
653 netvsc_send_recv_completion(device, net_device, transaction_id,
658 static void netvsc_receive(struct netvsc_device *net_device,
659 struct hv_device *device,
660 struct vmpacket_descriptor *packet)
662 struct vmtransfer_page_packet_header *vmxferpage_packet;
663 struct nvsp_message *nvsp_packet;
664 struct hv_netvsc_packet *netvsc_packet = NULL;
665 /* struct netvsc_driver *netvscDriver; */
666 struct xferpage_packet *xferpage_packet = NULL;
670 struct net_device *ndev;
674 ndev = net_device->ndev;
677 * All inbound packets other than send completion should be xfer page
680 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
681 netdev_err(ndev, "Unknown packet type received - %d\n",
686 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
687 (packet->offset8 << 3));
689 /* Make sure this is a valid nvsp packet */
690 if (nvsp_packet->hdr.msg_type !=
691 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
692 netdev_err(ndev, "Unknown nvsp packet type received-"
693 " %d\n", nvsp_packet->hdr.msg_type);
697 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
699 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
700 netdev_err(ndev, "Invalid xfer page set id - "
701 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
702 vmxferpage_packet->xfer_pageset_id);
707 * Grab free packets (range count + 1) to represent this xfer
708 * page packet. +1 to represent the xfer page packet itself.
709 * We grab it here so that we know exactly how many we can
712 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
713 while (!list_empty(&net_device->recv_pkt_list)) {
714 list_move_tail(net_device->recv_pkt_list.next, &listHead);
715 if (++count == vmxferpage_packet->range_cnt + 1)
718 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
721 * We need at least 2 netvsc pkts (1 to represent the xfer
722 * page and at least 1 for the range) i.e. we can handled
723 * some of the xfer page packet ranges...
726 netdev_err(ndev, "Got only %d netvsc pkt...needed "
727 "%d pkts. Dropping this xfer page packet completely!\n",
728 count, vmxferpage_packet->range_cnt + 1);
730 /* Return it to the freelist */
731 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
732 for (i = count; i != 0; i--) {
733 list_move_tail(listHead.next,
734 &net_device->recv_pkt_list);
736 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
739 netvsc_send_recv_completion(device, net_device,
740 vmxferpage_packet->d.trans_id,
746 /* Remove the 1st packet to represent the xfer page packet itself */
747 xferpage_packet = (struct xferpage_packet *)listHead.next;
748 list_del(&xferpage_packet->list_ent);
749 xferpage_packet->status = NVSP_STAT_SUCCESS;
751 /* This is how much we can satisfy */
752 xferpage_packet->count = count - 1;
754 if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
755 netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
756 "this xfer page...got %d\n",
757 vmxferpage_packet->range_cnt, xferpage_packet->count);
760 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
761 for (i = 0; i < (count - 1); i++) {
762 netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
763 list_del(&netvsc_packet->list_ent);
765 /* Initialize the netvsc packet */
766 netvsc_packet->status = NVSP_STAT_SUCCESS;
767 netvsc_packet->xfer_page_pkt = xferpage_packet;
768 netvsc_packet->completion.recv.recv_completion =
769 netvsc_receive_completion;
770 netvsc_packet->completion.recv.recv_completion_ctx =
772 netvsc_packet->device = device;
773 /* Save this so that we can send it back */
774 netvsc_packet->completion.recv.recv_completion_tid =
775 vmxferpage_packet->d.trans_id;
777 netvsc_packet->data = (void *)((unsigned long)net_device->
778 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
779 netvsc_packet->total_data_buflen =
780 vmxferpage_packet->ranges[i].byte_count;
782 /* Pass it to the upper layer */
783 rndis_filter_receive(device, netvsc_packet);
785 netvsc_receive_completion(netvsc_packet->
786 completion.recv.recv_completion_ctx);
791 static void netvsc_channel_cb(void *context)
794 struct hv_device *device = context;
795 struct netvsc_device *net_device;
798 unsigned char *packet;
799 struct vmpacket_descriptor *desc;
800 unsigned char *buffer;
801 int bufferlen = NETVSC_PACKET_SIZE;
802 struct net_device *ndev;
804 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
810 net_device = get_inbound_net_device(device);
813 ndev = net_device->ndev;
816 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
817 &bytes_recvd, &request_id);
819 if (bytes_recvd > 0) {
820 desc = (struct vmpacket_descriptor *)buffer;
821 switch (desc->type) {
823 netvsc_send_completion(net_device,
827 case VM_PKT_DATA_USING_XFER_PAGES:
828 netvsc_receive(net_device,
834 "unhandled packet type %d, "
836 desc->type, request_id,
842 if (bufferlen > NETVSC_PACKET_SIZE) {
845 bufferlen = NETVSC_PACKET_SIZE;
849 if (bufferlen > NETVSC_PACKET_SIZE) {
852 bufferlen = NETVSC_PACKET_SIZE;
857 } else if (ret == -ENOBUFS) {
858 /* Handle large packet */
859 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
860 if (buffer == NULL) {
861 /* Try again next time around */
863 "unable to allocate buffer of size "
864 "(%d)!!\n", bytes_recvd);
868 bufferlen = bytes_recvd;
878 * netvsc_device_add - Callback when the device belonging to this
881 int netvsc_device_add(struct hv_device *device, void *additional_info)
886 ((struct netvsc_device_info *)additional_info)->ring_size;
887 struct netvsc_device *net_device;
888 struct hv_netvsc_packet *packet, *pos;
889 struct net_device *ndev;
891 net_device = alloc_net_device(device);
898 * Coming into this function, struct net_device * is
899 * registered as the driver private data.
900 * In alloc_net_device(), we register struct netvsc_device *
901 * as the driver private data and stash away struct net_device *
902 * in struct netvsc_device *.
904 ndev = net_device->ndev;
906 /* Initialize the NetVSC channel extension */
907 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
908 spin_lock_init(&net_device->recv_pkt_list_lock);
910 INIT_LIST_HEAD(&net_device->recv_pkt_list);
912 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
913 packet = kzalloc(sizeof(struct hv_netvsc_packet), GFP_KERNEL);
917 list_add_tail(&packet->list_ent,
918 &net_device->recv_pkt_list);
920 init_completion(&net_device->channel_init_wait);
922 /* Open the channel */
923 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
924 ring_size * PAGE_SIZE, NULL, 0,
925 netvsc_channel_cb, device);
928 netdev_err(ndev, "unable to open channel: %d\n", ret);
932 /* Channel is opened */
933 pr_info("hv_netvsc channel opened successfully\n");
935 /* Connect with the NetVsp */
936 ret = netvsc_connect_vsp(device);
939 "unable to connect to NetVSP - %d\n", ret);
946 /* Now, we can close the channel safely */
947 vmbus_close(device->channel);
952 list_for_each_entry_safe(packet, pos,
953 &net_device->recv_pkt_list,
955 list_del(&packet->list_ent);