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 init_waitqueue_head(&net_device->wait_drain);
46 net_device->start_remove = false;
47 net_device->destroy = false;
48 net_device->dev = device;
49 net_device->ndev = ndev;
51 hv_set_drvdata(device, net_device);
55 static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
57 struct netvsc_device *net_device;
59 net_device = hv_get_drvdata(device);
60 if (net_device && net_device->destroy)
66 static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
68 struct netvsc_device *net_device;
70 net_device = hv_get_drvdata(device);
75 if (net_device->destroy &&
76 atomic_read(&net_device->num_outstanding_sends) == 0)
84 static int netvsc_destroy_recv_buf(struct netvsc_device *net_device)
86 struct nvsp_message *revoke_packet;
88 struct net_device *ndev = net_device->ndev;
91 * If we got a section count, it means we received a
92 * SendReceiveBufferComplete msg (ie sent
93 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
94 * to send a revoke msg here
96 if (net_device->recv_section_cnt) {
97 /* Send the revoke receive buffer */
98 revoke_packet = &net_device->revoke_packet;
99 memset(revoke_packet, 0, sizeof(struct nvsp_message));
101 revoke_packet->hdr.msg_type =
102 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
103 revoke_packet->msg.v1_msg.
104 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
106 ret = vmbus_sendpacket(net_device->dev->channel,
108 sizeof(struct nvsp_message),
109 (unsigned long)revoke_packet,
110 VM_PKT_DATA_INBAND, 0);
112 * If we failed here, we might as well return and
113 * have a leak rather than continue and a bugchk
116 netdev_err(ndev, "unable to send "
117 "revoke receive buffer to netvsp\n");
122 /* Teardown the gpadl on the vsp end */
123 if (net_device->recv_buf_gpadl_handle) {
124 ret = vmbus_teardown_gpadl(net_device->dev->channel,
125 net_device->recv_buf_gpadl_handle);
127 /* If we failed here, we might as well return and have a leak
128 * rather than continue and a bugchk
132 "unable to teardown receive buffer's gpadl\n");
135 net_device->recv_buf_gpadl_handle = 0;
138 if (net_device->recv_buf) {
139 /* Free up the receive buffer */
140 free_pages((unsigned long)net_device->recv_buf,
141 get_order(net_device->recv_buf_size));
142 net_device->recv_buf = NULL;
145 if (net_device->recv_section) {
146 net_device->recv_section_cnt = 0;
147 kfree(net_device->recv_section);
148 net_device->recv_section = NULL;
154 static int netvsc_init_recv_buf(struct hv_device *device)
158 struct netvsc_device *net_device;
159 struct nvsp_message *init_packet;
160 struct net_device *ndev;
162 net_device = get_outbound_net_device(device);
165 ndev = net_device->ndev;
167 net_device->recv_buf =
168 (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
169 get_order(net_device->recv_buf_size));
170 if (!net_device->recv_buf) {
171 netdev_err(ndev, "unable to allocate receive "
172 "buffer of size %d\n", net_device->recv_buf_size);
178 * Establish the gpadl handle for this buffer on this
179 * channel. Note: This call uses the vmbus connection rather
180 * than the channel to establish the gpadl handle.
182 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
183 net_device->recv_buf_size,
184 &net_device->recv_buf_gpadl_handle);
187 "unable to establish receive buffer's gpadl\n");
192 /* Notify the NetVsp of the gpadl handle */
193 init_packet = &net_device->channel_init_pkt;
195 memset(init_packet, 0, sizeof(struct nvsp_message));
197 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
198 init_packet->msg.v1_msg.send_recv_buf.
199 gpadl_handle = net_device->recv_buf_gpadl_handle;
200 init_packet->msg.v1_msg.
201 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
203 /* Send the gpadl notification request */
204 ret = vmbus_sendpacket(device->channel, init_packet,
205 sizeof(struct nvsp_message),
206 (unsigned long)init_packet,
208 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
211 "unable to send receive buffer's gpadl to netvsp\n");
215 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
219 /* Check the response */
220 if (init_packet->msg.v1_msg.
221 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
222 netdev_err(ndev, "Unable to complete receive buffer "
223 "initialization with NetVsp - status %d\n",
224 init_packet->msg.v1_msg.
225 send_recv_buf_complete.status);
230 /* Parse the response */
232 net_device->recv_section_cnt = init_packet->msg.
233 v1_msg.send_recv_buf_complete.num_sections;
235 net_device->recv_section = kmemdup(
236 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
237 net_device->recv_section_cnt *
238 sizeof(struct nvsp_1_receive_buffer_section),
240 if (net_device->recv_section == NULL) {
246 * For 1st release, there should only be 1 section that represents the
247 * entire receive buffer
249 if (net_device->recv_section_cnt != 1 ||
250 net_device->recv_section->offset != 0) {
258 netvsc_destroy_recv_buf(net_device);
265 /* Negotiate NVSP protocol version */
266 static int negotiate_nvsp_ver(struct hv_device *device,
267 struct netvsc_device *net_device,
268 struct nvsp_message *init_packet,
273 memset(init_packet, 0, sizeof(struct nvsp_message));
274 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
275 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
276 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
278 /* Send the init request */
279 ret = vmbus_sendpacket(device->channel, init_packet,
280 sizeof(struct nvsp_message),
281 (unsigned long)init_packet,
283 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
288 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
293 if (init_packet->msg.init_msg.init_complete.status !=
297 if (nvsp_ver != NVSP_PROTOCOL_VERSION_2)
300 /* NVSPv2 only: Send NDIS config */
301 memset(init_packet, 0, sizeof(struct nvsp_message));
302 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
303 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu;
304 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
306 ret = vmbus_sendpacket(device->channel, init_packet,
307 sizeof(struct nvsp_message),
308 (unsigned long)init_packet,
309 VM_PKT_DATA_INBAND, 0);
314 static int netvsc_connect_vsp(struct hv_device *device)
317 struct netvsc_device *net_device;
318 struct nvsp_message *init_packet;
320 struct net_device *ndev;
322 net_device = get_outbound_net_device(device);
325 ndev = net_device->ndev;
327 init_packet = &net_device->channel_init_pkt;
329 /* Negotiate the latest NVSP protocol supported */
330 if (negotiate_nvsp_ver(device, net_device, init_packet,
331 NVSP_PROTOCOL_VERSION_2) == 0) {
332 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
333 } else if (negotiate_nvsp_ver(device, net_device, init_packet,
334 NVSP_PROTOCOL_VERSION_1) == 0) {
335 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
341 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
343 /* Send the ndis version */
344 memset(init_packet, 0, sizeof(struct nvsp_message));
346 ndis_version = 0x00050001;
348 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
349 init_packet->msg.v1_msg.
350 send_ndis_ver.ndis_major_ver =
351 (ndis_version & 0xFFFF0000) >> 16;
352 init_packet->msg.v1_msg.
353 send_ndis_ver.ndis_minor_ver =
354 ndis_version & 0xFFFF;
356 /* Send the init request */
357 ret = vmbus_sendpacket(device->channel, init_packet,
358 sizeof(struct nvsp_message),
359 (unsigned long)init_packet,
360 VM_PKT_DATA_INBAND, 0);
364 /* Post the big receive buffer to NetVSP */
365 ret = netvsc_init_recv_buf(device);
371 static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
373 netvsc_destroy_recv_buf(net_device);
377 * netvsc_device_remove - Callback when the root bus device is removed
379 int netvsc_device_remove(struct hv_device *device)
381 struct netvsc_device *net_device;
382 struct hv_netvsc_packet *netvsc_packet, *pos;
385 net_device = hv_get_drvdata(device);
387 netvsc_disconnect_vsp(net_device);
390 * Since we have already drained, we don't need to busy wait
391 * as was done in final_release_stor_device()
392 * Note that we cannot set the ext pointer to NULL until
393 * we have drained - to drain the outgoing packets, we need to
394 * allow incoming packets.
397 spin_lock_irqsave(&device->channel->inbound_lock, flags);
398 hv_set_drvdata(device, NULL);
399 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
402 * At this point, no one should be accessing net_device
405 dev_notice(&device->device, "net device safe to remove\n");
407 /* Now, we can close the channel safely */
408 vmbus_close(device->channel);
410 /* Release all resources */
411 list_for_each_entry_safe(netvsc_packet, pos,
412 &net_device->recv_pkt_list, list_ent) {
413 list_del(&netvsc_packet->list_ent);
414 kfree(netvsc_packet);
422 #define RING_AVAIL_PERCENT_HIWATER 20
423 #define RING_AVAIL_PERCENT_LOWATER 10
426 * Get the percentage of available bytes to write in the ring.
427 * The return value is in range from 0 to 100.
429 static inline u32 hv_ringbuf_avail_percent(
430 struct hv_ring_buffer_info *ring_info)
432 u32 avail_read, avail_write;
434 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
436 return avail_write * 100 / ring_info->ring_datasize;
439 static void netvsc_send_completion(struct hv_device *device,
440 struct vmpacket_descriptor *packet)
442 struct netvsc_device *net_device;
443 struct nvsp_message *nvsp_packet;
444 struct hv_netvsc_packet *nvsc_packet;
445 struct net_device *ndev;
447 net_device = get_inbound_net_device(device);
450 ndev = net_device->ndev;
452 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
453 (packet->offset8 << 3));
455 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
456 (nvsp_packet->hdr.msg_type ==
457 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
458 (nvsp_packet->hdr.msg_type ==
459 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
460 /* Copy the response back */
461 memcpy(&net_device->channel_init_pkt, nvsp_packet,
462 sizeof(struct nvsp_message));
463 complete(&net_device->channel_init_wait);
464 } else if (nvsp_packet->hdr.msg_type ==
465 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
466 int num_outstanding_sends;
468 /* Get the send context */
469 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
472 /* Notify the layer above us */
473 nvsc_packet->completion.send.send_completion(
474 nvsc_packet->completion.send.send_completion_ctx);
476 num_outstanding_sends =
477 atomic_dec_return(&net_device->num_outstanding_sends);
479 if (net_device->destroy && num_outstanding_sends == 0)
480 wake_up(&net_device->wait_drain);
482 if (netif_queue_stopped(ndev) && !net_device->start_remove &&
483 (hv_ringbuf_avail_percent(&device->channel->outbound)
484 > RING_AVAIL_PERCENT_HIWATER ||
485 num_outstanding_sends < 1))
486 netif_wake_queue(ndev);
488 netdev_err(ndev, "Unknown send completion packet type- "
489 "%d received!!\n", nvsp_packet->hdr.msg_type);
494 int netvsc_send(struct hv_device *device,
495 struct hv_netvsc_packet *packet)
497 struct netvsc_device *net_device;
499 struct nvsp_message sendMessage;
500 struct net_device *ndev;
502 net_device = get_outbound_net_device(device);
505 ndev = net_device->ndev;
507 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
508 if (packet->is_data_pkt) {
510 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
512 /* 1 is RMC_CONTROL; */
513 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
516 /* Not using send buffer section */
517 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
519 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
521 if (packet->page_buf_cnt) {
522 ret = vmbus_sendpacket_pagebuffer(device->channel,
524 packet->page_buf_cnt,
526 sizeof(struct nvsp_message),
527 (unsigned long)packet);
529 ret = vmbus_sendpacket(device->channel, &sendMessage,
530 sizeof(struct nvsp_message),
531 (unsigned long)packet,
533 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,
563 struct nvsp_message recvcompMessage;
566 struct net_device *ndev;
567 struct netvsc_device *net_device = hv_get_drvdata(device);
569 ndev = net_device->ndev;
571 recvcompMessage.hdr.msg_type =
572 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
574 /* FIXME: Pass in the status */
575 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status =
579 /* Send the completion */
580 ret = vmbus_sendpacket(device->channel, &recvcompMessage,
581 sizeof(struct nvsp_message), transaction_id,
586 } else if (ret == -EAGAIN) {
587 /* no more room...wait a bit and attempt to retry 3 times */
589 netdev_err(ndev, "unable to send receive completion pkt"
590 " (tid %llx)...retrying %d\n", transaction_id, retries);
594 goto retry_send_cmplt;
596 netdev_err(ndev, "unable to send receive "
597 "completion pkt (tid %llx)...give up retrying\n",
601 netdev_err(ndev, "unable to send receive "
602 "completion pkt - %llx\n", transaction_id);
606 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
607 static void netvsc_receive_completion(void *context)
609 struct hv_netvsc_packet *packet = context;
610 struct hv_device *device = packet->device;
611 struct netvsc_device *net_device;
612 u64 transaction_id = 0;
613 bool fsend_receive_comp = false;
615 struct net_device *ndev;
618 * Even though it seems logical to do a GetOutboundNetDevice() here to
619 * send out receive completion, we are using GetInboundNetDevice()
620 * since we may have disable outbound traffic already.
622 net_device = get_inbound_net_device(device);
625 ndev = net_device->ndev;
627 /* Overloading use of the lock. */
628 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
630 packet->xfer_page_pkt->count--;
633 * Last one in the line that represent 1 xfer page packet.
634 * Return the xfer page packet itself to the freelist
636 if (packet->xfer_page_pkt->count == 0) {
637 fsend_receive_comp = true;
638 transaction_id = packet->completion.recv.recv_completion_tid;
639 list_add_tail(&packet->xfer_page_pkt->list_ent,
640 &net_device->recv_pkt_list);
644 /* Put the packet back */
645 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
646 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
648 /* Send a receive completion for the xfer page packet */
649 if (fsend_receive_comp)
650 netvsc_send_recv_completion(device, transaction_id);
654 static void netvsc_receive(struct hv_device *device,
655 struct vmpacket_descriptor *packet)
657 struct netvsc_device *net_device;
658 struct vmtransfer_page_packet_header *vmxferpage_packet;
659 struct nvsp_message *nvsp_packet;
660 struct hv_netvsc_packet *netvsc_packet = NULL;
661 /* struct netvsc_driver *netvscDriver; */
662 struct xferpage_packet *xferpage_packet = NULL;
666 struct net_device *ndev;
670 net_device = get_inbound_net_device(device);
673 ndev = net_device->ndev;
676 * All inbound packets other than send completion should be xfer page
679 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
680 netdev_err(ndev, "Unknown packet type received - %d\n",
685 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
686 (packet->offset8 << 3));
688 /* Make sure this is a valid nvsp packet */
689 if (nvsp_packet->hdr.msg_type !=
690 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
691 netdev_err(ndev, "Unknown nvsp packet type received-"
692 " %d\n", nvsp_packet->hdr.msg_type);
696 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
698 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
699 netdev_err(ndev, "Invalid xfer page set id - "
700 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
701 vmxferpage_packet->xfer_pageset_id);
706 * Grab free packets (range count + 1) to represent this xfer
707 * page packet. +1 to represent the xfer page packet itself.
708 * We grab it here so that we know exactly how many we can
711 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
712 while (!list_empty(&net_device->recv_pkt_list)) {
713 list_move_tail(net_device->recv_pkt_list.next, &listHead);
714 if (++count == vmxferpage_packet->range_cnt + 1)
717 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
720 * We need at least 2 netvsc pkts (1 to represent the xfer
721 * page and at least 1 for the range) i.e. we can handled
722 * some of the xfer page packet ranges...
725 netdev_err(ndev, "Got only %d netvsc pkt...needed "
726 "%d pkts. Dropping this xfer page packet completely!\n",
727 count, vmxferpage_packet->range_cnt + 1);
729 /* Return it to the freelist */
730 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
731 for (i = count; i != 0; i--) {
732 list_move_tail(listHead.next,
733 &net_device->recv_pkt_list);
735 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
738 netvsc_send_recv_completion(device,
739 vmxferpage_packet->d.trans_id);
744 /* Remove the 1st packet to represent the xfer page packet itself */
745 xferpage_packet = (struct xferpage_packet *)listHead.next;
746 list_del(&xferpage_packet->list_ent);
748 /* This is how much we can satisfy */
749 xferpage_packet->count = count - 1;
751 if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
752 netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
753 "this xfer page...got %d\n",
754 vmxferpage_packet->range_cnt, xferpage_packet->count);
757 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
758 for (i = 0; i < (count - 1); i++) {
759 netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
760 list_del(&netvsc_packet->list_ent);
762 /* Initialize the netvsc packet */
763 netvsc_packet->xfer_page_pkt = xferpage_packet;
764 netvsc_packet->completion.recv.recv_completion =
765 netvsc_receive_completion;
766 netvsc_packet->completion.recv.recv_completion_ctx =
768 netvsc_packet->device = device;
769 /* Save this so that we can send it back */
770 netvsc_packet->completion.recv.recv_completion_tid =
771 vmxferpage_packet->d.trans_id;
773 netvsc_packet->data = (void *)((unsigned long)net_device->
774 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
775 netvsc_packet->total_data_buflen =
776 vmxferpage_packet->ranges[i].byte_count;
778 /* Pass it to the upper layer */
779 rndis_filter_receive(device, netvsc_packet);
781 netvsc_receive_completion(netvsc_packet->
782 completion.recv.recv_completion_ctx);
787 static void netvsc_channel_cb(void *context)
790 struct hv_device *device = context;
791 struct netvsc_device *net_device;
794 unsigned char *packet;
795 struct vmpacket_descriptor *desc;
796 unsigned char *buffer;
797 int bufferlen = NETVSC_PACKET_SIZE;
798 struct net_device *ndev;
800 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
806 net_device = get_inbound_net_device(device);
809 ndev = net_device->ndev;
812 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
813 &bytes_recvd, &request_id);
815 if (bytes_recvd > 0) {
816 desc = (struct vmpacket_descriptor *)buffer;
817 switch (desc->type) {
819 netvsc_send_completion(device, desc);
822 case VM_PKT_DATA_USING_XFER_PAGES:
823 netvsc_receive(device, desc);
828 "unhandled packet type %d, "
830 desc->type, request_id,
836 if (bufferlen > NETVSC_PACKET_SIZE) {
839 bufferlen = NETVSC_PACKET_SIZE;
843 if (bufferlen > NETVSC_PACKET_SIZE) {
846 bufferlen = NETVSC_PACKET_SIZE;
851 } else if (ret == -ENOBUFS) {
852 /* Handle large packet */
853 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
854 if (buffer == NULL) {
855 /* Try again next time around */
857 "unable to allocate buffer of size "
858 "(%d)!!\n", bytes_recvd);
862 bufferlen = bytes_recvd;
872 * netvsc_device_add - Callback when the device belonging to this
875 int netvsc_device_add(struct hv_device *device, void *additional_info)
880 ((struct netvsc_device_info *)additional_info)->ring_size;
881 struct netvsc_device *net_device;
882 struct hv_netvsc_packet *packet, *pos;
883 struct net_device *ndev;
885 net_device = alloc_net_device(device);
892 * Coming into this function, struct net_device * is
893 * registered as the driver private data.
894 * In alloc_net_device(), we register struct netvsc_device *
895 * as the driver private data and stash away struct net_device *
896 * in struct netvsc_device *.
898 ndev = net_device->ndev;
900 /* Initialize the NetVSC channel extension */
901 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
902 spin_lock_init(&net_device->recv_pkt_list_lock);
904 INIT_LIST_HEAD(&net_device->recv_pkt_list);
906 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
907 packet = kzalloc(sizeof(struct hv_netvsc_packet) +
908 (NETVSC_RECEIVE_SG_COUNT *
909 sizeof(struct hv_page_buffer)), GFP_KERNEL);
913 list_add_tail(&packet->list_ent,
914 &net_device->recv_pkt_list);
916 init_completion(&net_device->channel_init_wait);
918 /* Open the channel */
919 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
920 ring_size * PAGE_SIZE, NULL, 0,
921 netvsc_channel_cb, device);
924 netdev_err(ndev, "unable to open channel: %d\n", ret);
928 /* Channel is opened */
929 pr_info("hv_netvsc channel opened successfully\n");
931 /* Connect with the NetVsp */
932 ret = netvsc_connect_vsp(device);
935 "unable to connect to NetVSP - %d\n", ret);
942 /* Now, we can close the channel safely */
943 vmbus_close(device->channel);
948 list_for_each_entry_safe(packet, pos,
949 &net_device->recv_pkt_list,
951 list_del(&packet->list_ent);