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>
31 #include <asm/sync_bitops.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->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL);
46 if (!net_device->cb_buffer) {
51 init_waitqueue_head(&net_device->wait_drain);
52 net_device->start_remove = false;
53 net_device->destroy = false;
54 net_device->dev = device;
55 net_device->ndev = ndev;
57 hv_set_drvdata(device, net_device);
61 static void free_netvsc_device(struct netvsc_device *nvdev)
63 kfree(nvdev->cb_buffer);
67 static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
69 struct netvsc_device *net_device;
71 net_device = hv_get_drvdata(device);
72 if (net_device && net_device->destroy)
78 static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
80 struct netvsc_device *net_device;
82 net_device = hv_get_drvdata(device);
87 if (net_device->destroy &&
88 atomic_read(&net_device->num_outstanding_sends) == 0)
96 static int netvsc_destroy_buf(struct netvsc_device *net_device)
98 struct nvsp_message *revoke_packet;
100 struct net_device *ndev = net_device->ndev;
103 * If we got a section count, it means we received a
104 * SendReceiveBufferComplete msg (ie sent
105 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
106 * to send a revoke msg here
108 if (net_device->recv_section_cnt) {
109 /* Send the revoke receive buffer */
110 revoke_packet = &net_device->revoke_packet;
111 memset(revoke_packet, 0, sizeof(struct nvsp_message));
113 revoke_packet->hdr.msg_type =
114 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
115 revoke_packet->msg.v1_msg.
116 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
118 ret = vmbus_sendpacket(net_device->dev->channel,
120 sizeof(struct nvsp_message),
121 (unsigned long)revoke_packet,
122 VM_PKT_DATA_INBAND, 0);
124 * If we failed here, we might as well return and
125 * have a leak rather than continue and a bugchk
128 netdev_err(ndev, "unable to send "
129 "revoke receive buffer to netvsp\n");
134 /* Teardown the gpadl on the vsp end */
135 if (net_device->recv_buf_gpadl_handle) {
136 ret = vmbus_teardown_gpadl(net_device->dev->channel,
137 net_device->recv_buf_gpadl_handle);
139 /* If we failed here, we might as well return and have a leak
140 * rather than continue and a bugchk
144 "unable to teardown receive buffer's gpadl\n");
147 net_device->recv_buf_gpadl_handle = 0;
150 if (net_device->recv_buf) {
151 /* Free up the receive buffer */
152 vfree(net_device->recv_buf);
153 net_device->recv_buf = NULL;
156 if (net_device->recv_section) {
157 net_device->recv_section_cnt = 0;
158 kfree(net_device->recv_section);
159 net_device->recv_section = NULL;
162 /* Deal with the send buffer we may have setup.
163 * If we got a send section size, it means we received a
164 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
165 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
166 * to send a revoke msg here
168 if (net_device->send_section_size) {
169 /* Send the revoke receive buffer */
170 revoke_packet = &net_device->revoke_packet;
171 memset(revoke_packet, 0, sizeof(struct nvsp_message));
173 revoke_packet->hdr.msg_type =
174 NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
175 revoke_packet->msg.v1_msg.revoke_send_buf.id =
176 NETVSC_SEND_BUFFER_ID;
178 ret = vmbus_sendpacket(net_device->dev->channel,
180 sizeof(struct nvsp_message),
181 (unsigned long)revoke_packet,
182 VM_PKT_DATA_INBAND, 0);
183 /* If we failed here, we might as well return and
184 * have a leak rather than continue and a bugchk
187 netdev_err(ndev, "unable to send "
188 "revoke send buffer to netvsp\n");
192 /* Teardown the gpadl on the vsp end */
193 if (net_device->send_buf_gpadl_handle) {
194 ret = vmbus_teardown_gpadl(net_device->dev->channel,
195 net_device->send_buf_gpadl_handle);
197 /* If we failed here, we might as well return and have a leak
198 * rather than continue and a bugchk
202 "unable to teardown send buffer's gpadl\n");
205 net_device->send_buf_gpadl_handle = 0;
207 if (net_device->send_buf) {
208 /* Free up the send buffer */
209 vfree(net_device->send_buf);
210 net_device->send_buf = NULL;
212 kfree(net_device->send_section_map);
217 static int netvsc_init_buf(struct hv_device *device)
221 struct netvsc_device *net_device;
222 struct nvsp_message *init_packet;
223 struct net_device *ndev;
225 net_device = get_outbound_net_device(device);
228 ndev = net_device->ndev;
230 net_device->recv_buf = vzalloc(net_device->recv_buf_size);
231 if (!net_device->recv_buf) {
232 netdev_err(ndev, "unable to allocate receive "
233 "buffer of size %d\n", net_device->recv_buf_size);
239 * Establish the gpadl handle for this buffer on this
240 * channel. Note: This call uses the vmbus connection rather
241 * than the channel to establish the gpadl handle.
243 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
244 net_device->recv_buf_size,
245 &net_device->recv_buf_gpadl_handle);
248 "unable to establish receive buffer's gpadl\n");
253 /* Notify the NetVsp of the gpadl handle */
254 init_packet = &net_device->channel_init_pkt;
256 memset(init_packet, 0, sizeof(struct nvsp_message));
258 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
259 init_packet->msg.v1_msg.send_recv_buf.
260 gpadl_handle = net_device->recv_buf_gpadl_handle;
261 init_packet->msg.v1_msg.
262 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
264 /* Send the gpadl notification request */
265 ret = vmbus_sendpacket(device->channel, init_packet,
266 sizeof(struct nvsp_message),
267 (unsigned long)init_packet,
269 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
272 "unable to send receive buffer's gpadl to netvsp\n");
276 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
280 /* Check the response */
281 if (init_packet->msg.v1_msg.
282 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
283 netdev_err(ndev, "Unable to complete receive buffer "
284 "initialization with NetVsp - status %d\n",
285 init_packet->msg.v1_msg.
286 send_recv_buf_complete.status);
291 /* Parse the response */
293 net_device->recv_section_cnt = init_packet->msg.
294 v1_msg.send_recv_buf_complete.num_sections;
296 net_device->recv_section = kmemdup(
297 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
298 net_device->recv_section_cnt *
299 sizeof(struct nvsp_1_receive_buffer_section),
301 if (net_device->recv_section == NULL) {
307 * For 1st release, there should only be 1 section that represents the
308 * entire receive buffer
310 if (net_device->recv_section_cnt != 1 ||
311 net_device->recv_section->offset != 0) {
316 /* Now setup the send buffer.
318 net_device->send_buf = vzalloc(net_device->send_buf_size);
319 if (!net_device->send_buf) {
320 netdev_err(ndev, "unable to allocate send "
321 "buffer of size %d\n", net_device->send_buf_size);
326 /* Establish the gpadl handle for this buffer on this
327 * channel. Note: This call uses the vmbus connection rather
328 * than the channel to establish the gpadl handle.
330 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
331 net_device->send_buf_size,
332 &net_device->send_buf_gpadl_handle);
335 "unable to establish send buffer's gpadl\n");
339 /* Notify the NetVsp of the gpadl handle */
340 init_packet = &net_device->channel_init_pkt;
341 memset(init_packet, 0, sizeof(struct nvsp_message));
342 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
343 init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
344 net_device->send_buf_gpadl_handle;
345 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
347 /* Send the gpadl notification request */
348 ret = vmbus_sendpacket(device->channel, init_packet,
349 sizeof(struct nvsp_message),
350 (unsigned long)init_packet,
352 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
355 "unable to send send buffer's gpadl to netvsp\n");
359 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
362 /* Check the response */
363 if (init_packet->msg.v1_msg.
364 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
365 netdev_err(ndev, "Unable to complete send buffer "
366 "initialization with NetVsp - status %d\n",
367 init_packet->msg.v1_msg.
368 send_send_buf_complete.status);
373 /* Parse the response */
374 net_device->send_section_size = init_packet->msg.
375 v1_msg.send_send_buf_complete.section_size;
377 /* Section count is simply the size divided by the section size.
379 net_device->send_section_cnt =
380 net_device->send_buf_size/net_device->send_section_size;
382 dev_info(&device->device, "Send section size: %d, Section count:%d\n",
383 net_device->send_section_size, net_device->send_section_cnt);
385 /* Setup state for managing the send buffer. */
386 net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
389 net_device->send_section_map =
390 kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL);
391 if (net_device->send_section_map == NULL) {
399 netvsc_destroy_buf(net_device);
406 /* Negotiate NVSP protocol version */
407 static int negotiate_nvsp_ver(struct hv_device *device,
408 struct netvsc_device *net_device,
409 struct nvsp_message *init_packet,
414 memset(init_packet, 0, sizeof(struct nvsp_message));
415 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
416 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
417 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
419 /* Send the init request */
420 ret = vmbus_sendpacket(device->channel, init_packet,
421 sizeof(struct nvsp_message),
422 (unsigned long)init_packet,
424 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
429 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
434 if (init_packet->msg.init_msg.init_complete.status !=
438 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
441 /* NVSPv2 only: Send NDIS config */
442 memset(init_packet, 0, sizeof(struct nvsp_message));
443 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
444 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu +
446 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
448 ret = vmbus_sendpacket(device->channel, init_packet,
449 sizeof(struct nvsp_message),
450 (unsigned long)init_packet,
451 VM_PKT_DATA_INBAND, 0);
456 static int netvsc_connect_vsp(struct hv_device *device)
459 struct netvsc_device *net_device;
460 struct nvsp_message *init_packet;
462 struct net_device *ndev;
463 u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
464 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
465 int i, num_ver = 4; /* number of different NVSP versions */
467 net_device = get_outbound_net_device(device);
470 ndev = net_device->ndev;
472 init_packet = &net_device->channel_init_pkt;
474 /* Negotiate the latest NVSP protocol supported */
475 for (i = num_ver - 1; i >= 0; i--)
476 if (negotiate_nvsp_ver(device, net_device, init_packet,
478 net_device->nvsp_version = ver_list[i];
487 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
489 /* Send the ndis version */
490 memset(init_packet, 0, sizeof(struct nvsp_message));
492 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
493 ndis_version = 0x00060001;
495 ndis_version = 0x0006001e;
497 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
498 init_packet->msg.v1_msg.
499 send_ndis_ver.ndis_major_ver =
500 (ndis_version & 0xFFFF0000) >> 16;
501 init_packet->msg.v1_msg.
502 send_ndis_ver.ndis_minor_ver =
503 ndis_version & 0xFFFF;
505 /* Send the init request */
506 ret = vmbus_sendpacket(device->channel, init_packet,
507 sizeof(struct nvsp_message),
508 (unsigned long)init_packet,
509 VM_PKT_DATA_INBAND, 0);
513 /* Post the big receive buffer to NetVSP */
514 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
515 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
517 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
518 net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
520 ret = netvsc_init_buf(device);
526 static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
528 netvsc_destroy_buf(net_device);
532 * netvsc_device_remove - Callback when the root bus device is removed
534 int netvsc_device_remove(struct hv_device *device)
536 struct netvsc_device *net_device;
539 net_device = hv_get_drvdata(device);
541 netvsc_disconnect_vsp(net_device);
544 * Since we have already drained, we don't need to busy wait
545 * as was done in final_release_stor_device()
546 * Note that we cannot set the ext pointer to NULL until
547 * we have drained - to drain the outgoing packets, we need to
548 * allow incoming packets.
551 spin_lock_irqsave(&device->channel->inbound_lock, flags);
552 hv_set_drvdata(device, NULL);
553 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
556 * At this point, no one should be accessing net_device
559 dev_notice(&device->device, "net device safe to remove\n");
561 /* Now, we can close the channel safely */
562 vmbus_close(device->channel);
564 /* Release all resources */
565 vfree(net_device->sub_cb_buf);
566 free_netvsc_device(net_device);
571 #define RING_AVAIL_PERCENT_HIWATER 20
572 #define RING_AVAIL_PERCENT_LOWATER 10
575 * Get the percentage of available bytes to write in the ring.
576 * The return value is in range from 0 to 100.
578 static inline u32 hv_ringbuf_avail_percent(
579 struct hv_ring_buffer_info *ring_info)
581 u32 avail_read, avail_write;
583 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
585 return avail_write * 100 / ring_info->ring_datasize;
588 static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
591 sync_change_bit(index, net_device->send_section_map);
594 static void netvsc_send_completion(struct netvsc_device *net_device,
595 struct hv_device *device,
596 struct vmpacket_descriptor *packet)
598 struct nvsp_message *nvsp_packet;
599 struct hv_netvsc_packet *nvsc_packet;
600 struct net_device *ndev;
603 ndev = net_device->ndev;
605 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
606 (packet->offset8 << 3));
608 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
609 (nvsp_packet->hdr.msg_type ==
610 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
611 (nvsp_packet->hdr.msg_type ==
612 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) ||
613 (nvsp_packet->hdr.msg_type ==
614 NVSP_MSG5_TYPE_SUBCHANNEL)) {
615 /* Copy the response back */
616 memcpy(&net_device->channel_init_pkt, nvsp_packet,
617 sizeof(struct nvsp_message));
618 complete(&net_device->channel_init_wait);
619 } else if (nvsp_packet->hdr.msg_type ==
620 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
621 int num_outstanding_sends;
623 struct vmbus_channel *channel = device->channel;
626 /* Get the send context */
627 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
630 /* Notify the layer above us */
632 send_index = nvsc_packet->send_buf_index;
633 if (send_index != NETVSC_INVALID_INDEX)
634 netvsc_free_send_slot(net_device, send_index);
635 q_idx = nvsc_packet->q_idx;
636 channel = nvsc_packet->channel;
637 nvsc_packet->send_completion(nvsc_packet->
638 send_completion_ctx);
641 num_outstanding_sends =
642 atomic_dec_return(&net_device->num_outstanding_sends);
643 queue_sends = atomic_dec_return(&net_device->
646 if (net_device->destroy && num_outstanding_sends == 0)
647 wake_up(&net_device->wait_drain);
649 if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) &&
650 !net_device->start_remove &&
651 (hv_ringbuf_avail_percent(&channel->outbound) >
652 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1))
653 netif_tx_wake_queue(netdev_get_tx_queue(
656 netdev_err(ndev, "Unknown send completion packet type- "
657 "%d received!!\n", nvsp_packet->hdr.msg_type);
662 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
665 u32 max_words = net_device->map_words;
666 unsigned long *map_addr = (unsigned long *)net_device->send_section_map;
667 u32 section_cnt = net_device->send_section_cnt;
668 int ret_val = NETVSC_INVALID_INDEX;
672 for (i = 0; i < max_words; i++) {
675 index = ffz(map_addr[i]);
676 prev_val = sync_test_and_set_bit(index, &map_addr[i]);
679 if ((index + (i * BITS_PER_LONG)) >= section_cnt)
681 ret_val = (index + (i * BITS_PER_LONG));
687 u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
688 unsigned int section_index,
689 struct hv_netvsc_packet *packet)
691 char *start = net_device->send_buf;
692 char *dest = (start + (section_index * net_device->send_section_size));
696 for (i = 0; i < packet->page_buf_cnt; i++) {
697 char *src = phys_to_virt(packet->page_buf[i].pfn << PAGE_SHIFT);
698 u32 offset = packet->page_buf[i].offset;
699 u32 len = packet->page_buf[i].len;
701 memcpy(dest, (src + offset), len);
708 int netvsc_send(struct hv_device *device,
709 struct hv_netvsc_packet *packet)
711 struct netvsc_device *net_device;
713 struct nvsp_message sendMessage;
714 struct net_device *ndev;
715 struct vmbus_channel *out_channel = NULL;
717 unsigned int section_index = NETVSC_INVALID_INDEX;
720 u16 q_idx = packet->q_idx;
723 net_device = get_outbound_net_device(device);
726 ndev = net_device->ndev;
728 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
729 if (packet->is_data_pkt) {
731 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
733 /* 1 is RMC_CONTROL; */
734 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
737 /* Attempt to send via sendbuf */
738 if (packet->total_data_buflen < net_device->send_section_size) {
739 section_index = netvsc_get_next_send_section(net_device);
740 if (section_index != NETVSC_INVALID_INDEX) {
741 msg_size = netvsc_copy_to_send_buf(net_device,
744 skb = (struct sk_buff *)
745 (unsigned long)packet->send_completion_tid;
747 dev_kfree_skb_any(skb);
748 packet->page_buf_cnt = 0;
751 packet->send_buf_index = section_index;
754 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
756 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = msg_size;
758 if (packet->send_completion)
759 req_id = (ulong)packet;
763 out_channel = net_device->chn_table[packet->q_idx];
764 if (out_channel == NULL)
765 out_channel = device->channel;
766 packet->channel = out_channel;
768 if (out_channel->rescind)
771 if (packet->page_buf_cnt) {
772 ret = vmbus_sendpacket_pagebuffer(out_channel,
774 packet->page_buf_cnt,
776 sizeof(struct nvsp_message),
779 ret = vmbus_sendpacket(out_channel, &sendMessage,
780 sizeof(struct nvsp_message),
783 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
787 atomic_inc(&net_device->num_outstanding_sends);
788 atomic_inc(&net_device->queue_sends[q_idx]);
790 if (hv_ringbuf_avail_percent(&out_channel->outbound) <
791 RING_AVAIL_PERCENT_LOWATER) {
792 netif_tx_stop_queue(netdev_get_tx_queue(
795 if (atomic_read(&net_device->
796 queue_sends[q_idx]) < 1)
797 netif_tx_wake_queue(netdev_get_tx_queue(
800 } else if (ret == -EAGAIN) {
801 netif_tx_stop_queue(netdev_get_tx_queue(
803 if (atomic_read(&net_device->queue_sends[q_idx]) < 1) {
804 netif_tx_wake_queue(netdev_get_tx_queue(
809 netdev_err(ndev, "Unable to send packet %p ret %d\n",
816 static void netvsc_send_recv_completion(struct hv_device *device,
817 struct vmbus_channel *channel,
818 struct netvsc_device *net_device,
819 u64 transaction_id, u32 status)
821 struct nvsp_message recvcompMessage;
824 struct net_device *ndev;
826 ndev = net_device->ndev;
828 recvcompMessage.hdr.msg_type =
829 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
831 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
834 /* Send the completion */
835 ret = vmbus_sendpacket(channel, &recvcompMessage,
836 sizeof(struct nvsp_message), transaction_id,
841 } else if (ret == -EAGAIN) {
842 /* no more room...wait a bit and attempt to retry 3 times */
844 netdev_err(ndev, "unable to send receive completion pkt"
845 " (tid %llx)...retrying %d\n", transaction_id, retries);
849 goto retry_send_cmplt;
851 netdev_err(ndev, "unable to send receive "
852 "completion pkt (tid %llx)...give up retrying\n",
856 netdev_err(ndev, "unable to send receive "
857 "completion pkt - %llx\n", transaction_id);
861 static void netvsc_receive(struct netvsc_device *net_device,
862 struct vmbus_channel *channel,
863 struct hv_device *device,
864 struct vmpacket_descriptor *packet)
866 struct vmtransfer_page_packet_header *vmxferpage_packet;
867 struct nvsp_message *nvsp_packet;
868 struct hv_netvsc_packet nv_pkt;
869 struct hv_netvsc_packet *netvsc_packet = &nv_pkt;
870 u32 status = NVSP_STAT_SUCCESS;
873 struct net_device *ndev;
875 ndev = net_device->ndev;
878 * All inbound packets other than send completion should be xfer page
881 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
882 netdev_err(ndev, "Unknown packet type received - %d\n",
887 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
888 (packet->offset8 << 3));
890 /* Make sure this is a valid nvsp packet */
891 if (nvsp_packet->hdr.msg_type !=
892 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
893 netdev_err(ndev, "Unknown nvsp packet type received-"
894 " %d\n", nvsp_packet->hdr.msg_type);
898 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
900 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
901 netdev_err(ndev, "Invalid xfer page set id - "
902 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
903 vmxferpage_packet->xfer_pageset_id);
907 count = vmxferpage_packet->range_cnt;
908 netvsc_packet->device = device;
909 netvsc_packet->channel = channel;
911 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
912 for (i = 0; i < count; i++) {
913 /* Initialize the netvsc packet */
914 netvsc_packet->status = NVSP_STAT_SUCCESS;
915 netvsc_packet->data = (void *)((unsigned long)net_device->
916 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
917 netvsc_packet->total_data_buflen =
918 vmxferpage_packet->ranges[i].byte_count;
920 /* Pass it to the upper layer */
921 rndis_filter_receive(device, netvsc_packet);
923 if (netvsc_packet->status != NVSP_STAT_SUCCESS)
924 status = NVSP_STAT_FAIL;
927 netvsc_send_recv_completion(device, channel, net_device,
928 vmxferpage_packet->d.trans_id, status);
932 static void netvsc_send_table(struct hv_device *hdev,
933 struct vmpacket_descriptor *vmpkt)
935 struct netvsc_device *nvscdev;
936 struct net_device *ndev;
937 struct nvsp_message *nvmsg;
941 nvscdev = get_outbound_net_device(hdev);
944 ndev = nvscdev->ndev;
946 nvmsg = (struct nvsp_message *)((unsigned long)vmpkt +
947 (vmpkt->offset8 << 3));
949 if (nvmsg->hdr.msg_type != NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE)
952 count = nvmsg->msg.v5_msg.send_table.count;
953 if (count != VRSS_SEND_TAB_SIZE) {
954 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
958 tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
959 nvmsg->msg.v5_msg.send_table.offset);
961 for (i = 0; i < count; i++)
962 nvscdev->send_table[i] = tab[i];
965 void netvsc_channel_cb(void *context)
968 struct vmbus_channel *channel = (struct vmbus_channel *)context;
969 struct hv_device *device;
970 struct netvsc_device *net_device;
973 struct vmpacket_descriptor *desc;
974 unsigned char *buffer;
975 int bufferlen = NETVSC_PACKET_SIZE;
976 struct net_device *ndev;
978 if (channel->primary_channel != NULL)
979 device = channel->primary_channel->device_obj;
981 device = channel->device_obj;
983 net_device = get_inbound_net_device(device);
986 ndev = net_device->ndev;
987 buffer = get_per_channel_state(channel);
990 ret = vmbus_recvpacket_raw(channel, buffer, bufferlen,
991 &bytes_recvd, &request_id);
993 if (bytes_recvd > 0) {
994 desc = (struct vmpacket_descriptor *)buffer;
995 switch (desc->type) {
997 netvsc_send_completion(net_device,
1001 case VM_PKT_DATA_USING_XFER_PAGES:
1002 netvsc_receive(net_device, channel,
1006 case VM_PKT_DATA_INBAND:
1007 netvsc_send_table(device, desc);
1012 "unhandled packet type %d, "
1013 "tid %llx len %d\n",
1014 desc->type, request_id,
1021 * We are done for this pass.
1026 } else if (ret == -ENOBUFS) {
1027 if (bufferlen > NETVSC_PACKET_SIZE)
1029 /* Handle large packet */
1030 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
1031 if (buffer == NULL) {
1032 /* Try again next time around */
1034 "unable to allocate buffer of size "
1035 "(%d)!!\n", bytes_recvd);
1039 bufferlen = bytes_recvd;
1043 if (bufferlen > NETVSC_PACKET_SIZE)
1049 * netvsc_device_add - Callback when the device belonging to this
1052 int netvsc_device_add(struct hv_device *device, void *additional_info)
1056 ((struct netvsc_device_info *)additional_info)->ring_size;
1057 struct netvsc_device *net_device;
1058 struct net_device *ndev;
1060 net_device = alloc_net_device(device);
1064 net_device->ring_size = ring_size;
1067 * Coming into this function, struct net_device * is
1068 * registered as the driver private data.
1069 * In alloc_net_device(), we register struct netvsc_device *
1070 * as the driver private data and stash away struct net_device *
1071 * in struct netvsc_device *.
1073 ndev = net_device->ndev;
1075 /* Initialize the NetVSC channel extension */
1076 init_completion(&net_device->channel_init_wait);
1078 set_per_channel_state(device->channel, net_device->cb_buffer);
1080 /* Open the channel */
1081 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
1082 ring_size * PAGE_SIZE, NULL, 0,
1083 netvsc_channel_cb, device->channel);
1086 netdev_err(ndev, "unable to open channel: %d\n", ret);
1090 /* Channel is opened */
1091 pr_info("hv_netvsc channel opened successfully\n");
1093 net_device->chn_table[0] = device->channel;
1095 /* Connect with the NetVsp */
1096 ret = netvsc_connect_vsp(device);
1099 "unable to connect to NetVSP - %d\n", ret);
1106 /* Now, we can close the channel safely */
1107 vmbus_close(device->channel);
1110 free_netvsc_device(net_device);