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 * SendsendBufferComplete msg (ie sent
165 * NvspMessage1TypeSendReceiveBuffer 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_recv_buf.id = 0;
177 ret = vmbus_sendpacket(net_device->dev->channel,
179 sizeof(struct nvsp_message),
180 (unsigned long)revoke_packet,
181 VM_PKT_DATA_INBAND, 0);
182 /* If we failed here, we might as well return and
183 * have a leak rather than continue and a bugchk
186 netdev_err(ndev, "unable to send "
187 "revoke send buffer to netvsp\n");
191 /* Teardown the gpadl on the vsp end */
192 if (net_device->send_buf_gpadl_handle) {
193 ret = vmbus_teardown_gpadl(net_device->dev->channel,
194 net_device->send_buf_gpadl_handle);
196 /* If we failed here, we might as well return and have a leak
197 * rather than continue and a bugchk
201 "unable to teardown send buffer's gpadl\n");
204 net_device->send_buf_gpadl_handle = 0;
206 if (net_device->send_buf) {
207 /* Free up the receive buffer */
208 vfree(net_device->send_buf);
209 net_device->send_buf = NULL;
211 kfree(net_device->send_section_map);
216 static int netvsc_init_buf(struct hv_device *device)
220 struct netvsc_device *net_device;
221 struct nvsp_message *init_packet;
222 struct net_device *ndev;
224 net_device = get_outbound_net_device(device);
227 ndev = net_device->ndev;
229 net_device->recv_buf = vzalloc(net_device->recv_buf_size);
230 if (!net_device->recv_buf) {
231 netdev_err(ndev, "unable to allocate receive "
232 "buffer of size %d\n", net_device->recv_buf_size);
238 * Establish the gpadl handle for this buffer on this
239 * channel. Note: This call uses the vmbus connection rather
240 * than the channel to establish the gpadl handle.
242 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
243 net_device->recv_buf_size,
244 &net_device->recv_buf_gpadl_handle);
247 "unable to establish receive buffer's gpadl\n");
252 /* Notify the NetVsp of the gpadl handle */
253 init_packet = &net_device->channel_init_pkt;
255 memset(init_packet, 0, sizeof(struct nvsp_message));
257 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
258 init_packet->msg.v1_msg.send_recv_buf.
259 gpadl_handle = net_device->recv_buf_gpadl_handle;
260 init_packet->msg.v1_msg.
261 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
263 /* Send the gpadl notification request */
264 ret = vmbus_sendpacket(device->channel, init_packet,
265 sizeof(struct nvsp_message),
266 (unsigned long)init_packet,
268 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
271 "unable to send receive buffer's gpadl to netvsp\n");
275 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
279 /* Check the response */
280 if (init_packet->msg.v1_msg.
281 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
282 netdev_err(ndev, "Unable to complete receive buffer "
283 "initialization with NetVsp - status %d\n",
284 init_packet->msg.v1_msg.
285 send_recv_buf_complete.status);
290 /* Parse the response */
292 net_device->recv_section_cnt = init_packet->msg.
293 v1_msg.send_recv_buf_complete.num_sections;
295 net_device->recv_section = kmemdup(
296 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
297 net_device->recv_section_cnt *
298 sizeof(struct nvsp_1_receive_buffer_section),
300 if (net_device->recv_section == NULL) {
306 * For 1st release, there should only be 1 section that represents the
307 * entire receive buffer
309 if (net_device->recv_section_cnt != 1 ||
310 net_device->recv_section->offset != 0) {
315 /* Now setup the send buffer.
317 net_device->send_buf = vzalloc(net_device->send_buf_size);
318 if (!net_device->send_buf) {
319 netdev_err(ndev, "unable to allocate send "
320 "buffer of size %d\n", net_device->send_buf_size);
325 /* Establish the gpadl handle for this buffer on this
326 * channel. Note: This call uses the vmbus connection rather
327 * than the channel to establish the gpadl handle.
329 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
330 net_device->send_buf_size,
331 &net_device->send_buf_gpadl_handle);
334 "unable to establish send buffer's gpadl\n");
338 /* Notify the NetVsp of the gpadl handle */
339 init_packet = &net_device->channel_init_pkt;
340 memset(init_packet, 0, sizeof(struct nvsp_message));
341 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
342 init_packet->msg.v1_msg.send_recv_buf.gpadl_handle =
343 net_device->send_buf_gpadl_handle;
344 init_packet->msg.v1_msg.send_recv_buf.id = 0;
346 /* Send the gpadl notification request */
347 ret = vmbus_sendpacket(device->channel, init_packet,
348 sizeof(struct nvsp_message),
349 (unsigned long)init_packet,
351 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
354 "unable to send send buffer's gpadl to netvsp\n");
358 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
361 /* Check the response */
362 if (init_packet->msg.v1_msg.
363 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
364 netdev_err(ndev, "Unable to complete send buffer "
365 "initialization with NetVsp - status %d\n",
366 init_packet->msg.v1_msg.
367 send_recv_buf_complete.status);
372 /* Parse the response */
373 net_device->send_section_size = init_packet->msg.
374 v1_msg.send_send_buf_complete.section_size;
376 /* Section count is simply the size divided by the section size.
378 net_device->send_section_cnt =
379 net_device->send_buf_size/net_device->send_section_size;
381 dev_info(&device->device, "Send section size: %d, Section count:%d\n",
382 net_device->send_section_size, net_device->send_section_cnt);
384 /* Setup state for managing the send buffer. */
385 net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
388 net_device->send_section_map =
389 kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL);
390 if (net_device->send_section_map == NULL) {
398 netvsc_destroy_buf(net_device);
405 /* Negotiate NVSP protocol version */
406 static int negotiate_nvsp_ver(struct hv_device *device,
407 struct netvsc_device *net_device,
408 struct nvsp_message *init_packet,
413 memset(init_packet, 0, sizeof(struct nvsp_message));
414 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
415 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
416 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
418 /* Send the init request */
419 ret = vmbus_sendpacket(device->channel, init_packet,
420 sizeof(struct nvsp_message),
421 (unsigned long)init_packet,
423 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
428 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
433 if (init_packet->msg.init_msg.init_complete.status !=
437 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
440 /* NVSPv2 only: Send NDIS config */
441 memset(init_packet, 0, sizeof(struct nvsp_message));
442 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
443 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu;
444 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
446 ret = vmbus_sendpacket(device->channel, init_packet,
447 sizeof(struct nvsp_message),
448 (unsigned long)init_packet,
449 VM_PKT_DATA_INBAND, 0);
454 static int netvsc_connect_vsp(struct hv_device *device)
457 struct netvsc_device *net_device;
458 struct nvsp_message *init_packet;
460 struct net_device *ndev;
461 u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
462 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
463 int i, num_ver = 4; /* number of different NVSP versions */
465 net_device = get_outbound_net_device(device);
468 ndev = net_device->ndev;
470 init_packet = &net_device->channel_init_pkt;
472 /* Negotiate the latest NVSP protocol supported */
473 for (i = num_ver - 1; i >= 0; i--)
474 if (negotiate_nvsp_ver(device, net_device, init_packet,
476 net_device->nvsp_version = ver_list[i];
485 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
487 /* Send the ndis version */
488 memset(init_packet, 0, sizeof(struct nvsp_message));
490 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
491 ndis_version = 0x00060001;
493 ndis_version = 0x0006001e;
495 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
496 init_packet->msg.v1_msg.
497 send_ndis_ver.ndis_major_ver =
498 (ndis_version & 0xFFFF0000) >> 16;
499 init_packet->msg.v1_msg.
500 send_ndis_ver.ndis_minor_ver =
501 ndis_version & 0xFFFF;
503 /* Send the init request */
504 ret = vmbus_sendpacket(device->channel, init_packet,
505 sizeof(struct nvsp_message),
506 (unsigned long)init_packet,
507 VM_PKT_DATA_INBAND, 0);
511 /* Post the big receive buffer to NetVSP */
512 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
513 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
515 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
516 net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
518 ret = netvsc_init_buf(device);
524 static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
526 netvsc_destroy_buf(net_device);
530 * netvsc_device_remove - Callback when the root bus device is removed
532 int netvsc_device_remove(struct hv_device *device)
534 struct netvsc_device *net_device;
537 net_device = hv_get_drvdata(device);
539 netvsc_disconnect_vsp(net_device);
542 * Since we have already drained, we don't need to busy wait
543 * as was done in final_release_stor_device()
544 * Note that we cannot set the ext pointer to NULL until
545 * we have drained - to drain the outgoing packets, we need to
546 * allow incoming packets.
549 spin_lock_irqsave(&device->channel->inbound_lock, flags);
550 hv_set_drvdata(device, NULL);
551 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
554 * At this point, no one should be accessing net_device
557 dev_notice(&device->device, "net device safe to remove\n");
559 /* Now, we can close the channel safely */
560 vmbus_close(device->channel);
562 /* Release all resources */
563 if (net_device->sub_cb_buf)
564 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 (packet->page_buf_cnt) {
769 ret = vmbus_sendpacket_pagebuffer(out_channel,
771 packet->page_buf_cnt,
773 sizeof(struct nvsp_message),
776 ret = vmbus_sendpacket(out_channel, &sendMessage,
777 sizeof(struct nvsp_message),
780 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
784 atomic_inc(&net_device->num_outstanding_sends);
785 atomic_inc(&net_device->queue_sends[q_idx]);
787 if (hv_ringbuf_avail_percent(&out_channel->outbound) <
788 RING_AVAIL_PERCENT_LOWATER) {
789 netif_tx_stop_queue(netdev_get_tx_queue(
792 if (atomic_read(&net_device->
793 queue_sends[q_idx]) < 1)
794 netif_tx_wake_queue(netdev_get_tx_queue(
797 } else if (ret == -EAGAIN) {
798 netif_tx_stop_queue(netdev_get_tx_queue(
800 if (atomic_read(&net_device->queue_sends[q_idx]) < 1) {
801 netif_tx_wake_queue(netdev_get_tx_queue(
806 netdev_err(ndev, "Unable to send packet %p ret %d\n",
813 static void netvsc_send_recv_completion(struct hv_device *device,
814 struct vmbus_channel *channel,
815 struct netvsc_device *net_device,
816 u64 transaction_id, u32 status)
818 struct nvsp_message recvcompMessage;
821 struct net_device *ndev;
823 ndev = net_device->ndev;
825 recvcompMessage.hdr.msg_type =
826 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
828 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
831 /* Send the completion */
832 ret = vmbus_sendpacket(channel, &recvcompMessage,
833 sizeof(struct nvsp_message), transaction_id,
838 } else if (ret == -EAGAIN) {
839 /* no more room...wait a bit and attempt to retry 3 times */
841 netdev_err(ndev, "unable to send receive completion pkt"
842 " (tid %llx)...retrying %d\n", transaction_id, retries);
846 goto retry_send_cmplt;
848 netdev_err(ndev, "unable to send receive "
849 "completion pkt (tid %llx)...give up retrying\n",
853 netdev_err(ndev, "unable to send receive "
854 "completion pkt - %llx\n", transaction_id);
858 static void netvsc_receive(struct netvsc_device *net_device,
859 struct vmbus_channel *channel,
860 struct hv_device *device,
861 struct vmpacket_descriptor *packet)
863 struct vmtransfer_page_packet_header *vmxferpage_packet;
864 struct nvsp_message *nvsp_packet;
865 struct hv_netvsc_packet nv_pkt;
866 struct hv_netvsc_packet *netvsc_packet = &nv_pkt;
867 u32 status = NVSP_STAT_SUCCESS;
870 struct net_device *ndev;
872 ndev = net_device->ndev;
875 * All inbound packets other than send completion should be xfer page
878 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
879 netdev_err(ndev, "Unknown packet type received - %d\n",
884 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
885 (packet->offset8 << 3));
887 /* Make sure this is a valid nvsp packet */
888 if (nvsp_packet->hdr.msg_type !=
889 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
890 netdev_err(ndev, "Unknown nvsp packet type received-"
891 " %d\n", nvsp_packet->hdr.msg_type);
895 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
897 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
898 netdev_err(ndev, "Invalid xfer page set id - "
899 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
900 vmxferpage_packet->xfer_pageset_id);
904 count = vmxferpage_packet->range_cnt;
905 netvsc_packet->device = device;
906 netvsc_packet->channel = channel;
908 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
909 for (i = 0; i < count; i++) {
910 /* Initialize the netvsc packet */
911 netvsc_packet->status = NVSP_STAT_SUCCESS;
912 netvsc_packet->data = (void *)((unsigned long)net_device->
913 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
914 netvsc_packet->total_data_buflen =
915 vmxferpage_packet->ranges[i].byte_count;
917 /* Pass it to the upper layer */
918 rndis_filter_receive(device, netvsc_packet);
920 if (netvsc_packet->status != NVSP_STAT_SUCCESS)
921 status = NVSP_STAT_FAIL;
924 netvsc_send_recv_completion(device, channel, net_device,
925 vmxferpage_packet->d.trans_id, status);
929 static void netvsc_send_table(struct hv_device *hdev,
930 struct vmpacket_descriptor *vmpkt)
932 struct netvsc_device *nvscdev;
933 struct net_device *ndev;
934 struct nvsp_message *nvmsg;
938 nvscdev = get_outbound_net_device(hdev);
941 ndev = nvscdev->ndev;
943 nvmsg = (struct nvsp_message *)((unsigned long)vmpkt +
944 (vmpkt->offset8 << 3));
946 if (nvmsg->hdr.msg_type != NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE)
949 count = nvmsg->msg.v5_msg.send_table.count;
950 if (count != VRSS_SEND_TAB_SIZE) {
951 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
955 tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
956 nvmsg->msg.v5_msg.send_table.offset);
958 for (i = 0; i < count; i++)
959 nvscdev->send_table[i] = tab[i];
962 void netvsc_channel_cb(void *context)
965 struct vmbus_channel *channel = (struct vmbus_channel *)context;
966 struct hv_device *device;
967 struct netvsc_device *net_device;
970 struct vmpacket_descriptor *desc;
971 unsigned char *buffer;
972 int bufferlen = NETVSC_PACKET_SIZE;
973 struct net_device *ndev;
975 if (channel->primary_channel != NULL)
976 device = channel->primary_channel->device_obj;
978 device = channel->device_obj;
980 net_device = get_inbound_net_device(device);
983 ndev = net_device->ndev;
984 buffer = get_per_channel_state(channel);
987 ret = vmbus_recvpacket_raw(channel, buffer, bufferlen,
988 &bytes_recvd, &request_id);
990 if (bytes_recvd > 0) {
991 desc = (struct vmpacket_descriptor *)buffer;
992 switch (desc->type) {
994 netvsc_send_completion(net_device,
998 case VM_PKT_DATA_USING_XFER_PAGES:
999 netvsc_receive(net_device, channel,
1003 case VM_PKT_DATA_INBAND:
1004 netvsc_send_table(device, desc);
1009 "unhandled packet type %d, "
1010 "tid %llx len %d\n",
1011 desc->type, request_id,
1018 * We are done for this pass.
1023 } else if (ret == -ENOBUFS) {
1024 if (bufferlen > NETVSC_PACKET_SIZE)
1026 /* Handle large packet */
1027 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
1028 if (buffer == NULL) {
1029 /* Try again next time around */
1031 "unable to allocate buffer of size "
1032 "(%d)!!\n", bytes_recvd);
1036 bufferlen = bytes_recvd;
1040 if (bufferlen > NETVSC_PACKET_SIZE)
1046 * netvsc_device_add - Callback when the device belonging to this
1049 int netvsc_device_add(struct hv_device *device, void *additional_info)
1053 ((struct netvsc_device_info *)additional_info)->ring_size;
1054 struct netvsc_device *net_device;
1055 struct net_device *ndev;
1057 net_device = alloc_net_device(device);
1061 net_device->ring_size = ring_size;
1064 * Coming into this function, struct net_device * is
1065 * registered as the driver private data.
1066 * In alloc_net_device(), we register struct netvsc_device *
1067 * as the driver private data and stash away struct net_device *
1068 * in struct netvsc_device *.
1070 ndev = net_device->ndev;
1072 /* Initialize the NetVSC channel extension */
1073 init_completion(&net_device->channel_init_wait);
1075 set_per_channel_state(device->channel, net_device->cb_buffer);
1077 /* Open the channel */
1078 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
1079 ring_size * PAGE_SIZE, NULL, 0,
1080 netvsc_channel_cb, device->channel);
1083 netdev_err(ndev, "unable to open channel: %d\n", ret);
1087 /* Channel is opened */
1088 pr_info("hv_netvsc channel opened successfully\n");
1090 net_device->chn_table[0] = device->channel;
1092 /* Connect with the NetVsp */
1093 ret = netvsc_connect_vsp(device);
1096 "unable to connect to NetVSP - %d\n", ret);
1103 /* Now, we can close the channel safely */
1104 vmbus_close(device->channel);
1107 free_netvsc_device(net_device);