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 <linux/vmalloc.h>
32 #include <asm/sync_bitops.h>
34 #include "hyperv_net.h"
37 static struct netvsc_device *alloc_net_device(struct hv_device *device)
39 struct netvsc_device *net_device;
40 struct net_device *ndev = hv_get_drvdata(device);
42 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
46 net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL);
47 if (!net_device->cb_buffer) {
52 init_waitqueue_head(&net_device->wait_drain);
53 net_device->start_remove = false;
54 net_device->destroy = false;
55 net_device->dev = device;
56 net_device->ndev = ndev;
57 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
58 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
60 hv_set_drvdata(device, net_device);
64 static void free_netvsc_device(struct netvsc_device *nvdev)
66 kfree(nvdev->cb_buffer);
70 static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
72 struct netvsc_device *net_device;
74 net_device = hv_get_drvdata(device);
75 if (net_device && net_device->destroy)
81 static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
83 struct netvsc_device *net_device;
85 net_device = hv_get_drvdata(device);
90 if (net_device->destroy &&
91 atomic_read(&net_device->num_outstanding_sends) == 0)
99 static int netvsc_destroy_buf(struct netvsc_device *net_device)
101 struct nvsp_message *revoke_packet;
103 struct net_device *ndev = net_device->ndev;
106 * If we got a section count, it means we received a
107 * SendReceiveBufferComplete msg (ie sent
108 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
109 * to send a revoke msg here
111 if (net_device->recv_section_cnt) {
112 /* Send the revoke receive buffer */
113 revoke_packet = &net_device->revoke_packet;
114 memset(revoke_packet, 0, sizeof(struct nvsp_message));
116 revoke_packet->hdr.msg_type =
117 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
118 revoke_packet->msg.v1_msg.
119 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
121 ret = vmbus_sendpacket(net_device->dev->channel,
123 sizeof(struct nvsp_message),
124 (unsigned long)revoke_packet,
125 VM_PKT_DATA_INBAND, 0);
127 * If we failed here, we might as well return and
128 * have a leak rather than continue and a bugchk
131 netdev_err(ndev, "unable to send "
132 "revoke receive buffer to netvsp\n");
137 /* Teardown the gpadl on the vsp end */
138 if (net_device->recv_buf_gpadl_handle) {
139 ret = vmbus_teardown_gpadl(net_device->dev->channel,
140 net_device->recv_buf_gpadl_handle);
142 /* If we failed here, we might as well return and have a leak
143 * rather than continue and a bugchk
147 "unable to teardown receive buffer's gpadl\n");
150 net_device->recv_buf_gpadl_handle = 0;
153 if (net_device->recv_buf) {
154 /* Free up the receive buffer */
155 vfree(net_device->recv_buf);
156 net_device->recv_buf = NULL;
159 if (net_device->recv_section) {
160 net_device->recv_section_cnt = 0;
161 kfree(net_device->recv_section);
162 net_device->recv_section = NULL;
165 /* Deal with the send buffer we may have setup.
166 * If we got a send section size, it means we received a
167 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
168 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
169 * to send a revoke msg here
171 if (net_device->send_section_size) {
172 /* Send the revoke receive buffer */
173 revoke_packet = &net_device->revoke_packet;
174 memset(revoke_packet, 0, sizeof(struct nvsp_message));
176 revoke_packet->hdr.msg_type =
177 NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
178 revoke_packet->msg.v1_msg.revoke_send_buf.id =
179 NETVSC_SEND_BUFFER_ID;
181 ret = vmbus_sendpacket(net_device->dev->channel,
183 sizeof(struct nvsp_message),
184 (unsigned long)revoke_packet,
185 VM_PKT_DATA_INBAND, 0);
186 /* If we failed here, we might as well return and
187 * have a leak rather than continue and a bugchk
190 netdev_err(ndev, "unable to send "
191 "revoke send buffer to netvsp\n");
195 /* Teardown the gpadl on the vsp end */
196 if (net_device->send_buf_gpadl_handle) {
197 ret = vmbus_teardown_gpadl(net_device->dev->channel,
198 net_device->send_buf_gpadl_handle);
200 /* If we failed here, we might as well return and have a leak
201 * rather than continue and a bugchk
205 "unable to teardown send buffer's gpadl\n");
208 net_device->send_buf_gpadl_handle = 0;
210 if (net_device->send_buf) {
211 /* Free up the send buffer */
212 vfree(net_device->send_buf);
213 net_device->send_buf = NULL;
215 kfree(net_device->send_section_map);
220 static int netvsc_init_buf(struct hv_device *device)
224 struct netvsc_device *net_device;
225 struct nvsp_message *init_packet;
226 struct net_device *ndev;
229 net_device = get_outbound_net_device(device);
232 ndev = net_device->ndev;
234 node = cpu_to_node(device->channel->target_cpu);
235 net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node);
236 if (!net_device->recv_buf)
237 net_device->recv_buf = vzalloc(net_device->recv_buf_size);
239 if (!net_device->recv_buf) {
240 netdev_err(ndev, "unable to allocate receive "
241 "buffer of size %d\n", net_device->recv_buf_size);
247 * Establish the gpadl handle for this buffer on this
248 * channel. Note: This call uses the vmbus connection rather
249 * than the channel to establish the gpadl handle.
251 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
252 net_device->recv_buf_size,
253 &net_device->recv_buf_gpadl_handle);
256 "unable to establish receive buffer's gpadl\n");
261 /* Notify the NetVsp of the gpadl handle */
262 init_packet = &net_device->channel_init_pkt;
264 memset(init_packet, 0, sizeof(struct nvsp_message));
266 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
267 init_packet->msg.v1_msg.send_recv_buf.
268 gpadl_handle = net_device->recv_buf_gpadl_handle;
269 init_packet->msg.v1_msg.
270 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
272 /* Send the gpadl notification request */
273 ret = vmbus_sendpacket(device->channel, init_packet,
274 sizeof(struct nvsp_message),
275 (unsigned long)init_packet,
277 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
280 "unable to send receive buffer's gpadl to netvsp\n");
284 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
288 /* Check the response */
289 if (init_packet->msg.v1_msg.
290 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
291 netdev_err(ndev, "Unable to complete receive buffer "
292 "initialization with NetVsp - status %d\n",
293 init_packet->msg.v1_msg.
294 send_recv_buf_complete.status);
299 /* Parse the response */
301 net_device->recv_section_cnt = init_packet->msg.
302 v1_msg.send_recv_buf_complete.num_sections;
304 net_device->recv_section = kmemdup(
305 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
306 net_device->recv_section_cnt *
307 sizeof(struct nvsp_1_receive_buffer_section),
309 if (net_device->recv_section == NULL) {
315 * For 1st release, there should only be 1 section that represents the
316 * entire receive buffer
318 if (net_device->recv_section_cnt != 1 ||
319 net_device->recv_section->offset != 0) {
324 /* Now setup the send buffer.
326 net_device->send_buf = vzalloc_node(net_device->send_buf_size, node);
327 if (!net_device->send_buf)
328 net_device->send_buf = vzalloc(net_device->send_buf_size);
329 if (!net_device->send_buf) {
330 netdev_err(ndev, "unable to allocate send "
331 "buffer of size %d\n", net_device->send_buf_size);
336 /* Establish the gpadl handle for this buffer on this
337 * channel. Note: This call uses the vmbus connection rather
338 * than the channel to establish the gpadl handle.
340 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
341 net_device->send_buf_size,
342 &net_device->send_buf_gpadl_handle);
345 "unable to establish send buffer's gpadl\n");
349 /* Notify the NetVsp of the gpadl handle */
350 init_packet = &net_device->channel_init_pkt;
351 memset(init_packet, 0, sizeof(struct nvsp_message));
352 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
353 init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
354 net_device->send_buf_gpadl_handle;
355 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
357 /* Send the gpadl notification request */
358 ret = vmbus_sendpacket(device->channel, init_packet,
359 sizeof(struct nvsp_message),
360 (unsigned long)init_packet,
362 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
365 "unable to send send buffer's gpadl to netvsp\n");
369 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
372 /* Check the response */
373 if (init_packet->msg.v1_msg.
374 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
375 netdev_err(ndev, "Unable to complete send buffer "
376 "initialization with NetVsp - status %d\n",
377 init_packet->msg.v1_msg.
378 send_send_buf_complete.status);
383 /* Parse the response */
384 net_device->send_section_size = init_packet->msg.
385 v1_msg.send_send_buf_complete.section_size;
387 /* Section count is simply the size divided by the section size.
389 net_device->send_section_cnt =
390 net_device->send_buf_size/net_device->send_section_size;
392 dev_info(&device->device, "Send section size: %d, Section count:%d\n",
393 net_device->send_section_size, net_device->send_section_cnt);
395 /* Setup state for managing the send buffer. */
396 net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
399 net_device->send_section_map =
400 kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL);
401 if (net_device->send_section_map == NULL) {
409 netvsc_destroy_buf(net_device);
416 /* Negotiate NVSP protocol version */
417 static int negotiate_nvsp_ver(struct hv_device *device,
418 struct netvsc_device *net_device,
419 struct nvsp_message *init_packet,
425 memset(init_packet, 0, sizeof(struct nvsp_message));
426 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
427 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
428 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
430 /* Send the init request */
431 ret = vmbus_sendpacket(device->channel, init_packet,
432 sizeof(struct nvsp_message),
433 (unsigned long)init_packet,
435 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
440 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
445 if (init_packet->msg.init_msg.init_complete.status !=
449 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
452 /* NVSPv2 or later: Send NDIS config */
453 memset(init_packet, 0, sizeof(struct nvsp_message));
454 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
455 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu +
457 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
459 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5)
460 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
462 ret = vmbus_sendpacket(device->channel, init_packet,
463 sizeof(struct nvsp_message),
464 (unsigned long)init_packet,
465 VM_PKT_DATA_INBAND, 0);
470 static int netvsc_connect_vsp(struct hv_device *device)
473 struct netvsc_device *net_device;
474 struct nvsp_message *init_packet;
476 struct net_device *ndev;
477 u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
478 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
479 int i, num_ver = 4; /* number of different NVSP versions */
481 net_device = get_outbound_net_device(device);
484 ndev = net_device->ndev;
486 init_packet = &net_device->channel_init_pkt;
488 /* Negotiate the latest NVSP protocol supported */
489 for (i = num_ver - 1; i >= 0; i--)
490 if (negotiate_nvsp_ver(device, net_device, init_packet,
492 net_device->nvsp_version = ver_list[i];
501 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
503 /* Send the ndis version */
504 memset(init_packet, 0, sizeof(struct nvsp_message));
506 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
507 ndis_version = 0x00060001;
509 ndis_version = 0x0006001e;
511 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
512 init_packet->msg.v1_msg.
513 send_ndis_ver.ndis_major_ver =
514 (ndis_version & 0xFFFF0000) >> 16;
515 init_packet->msg.v1_msg.
516 send_ndis_ver.ndis_minor_ver =
517 ndis_version & 0xFFFF;
519 /* Send the init request */
520 ret = vmbus_sendpacket(device->channel, init_packet,
521 sizeof(struct nvsp_message),
522 (unsigned long)init_packet,
523 VM_PKT_DATA_INBAND, 0);
527 /* Post the big receive buffer to NetVSP */
528 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
529 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
531 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
532 net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
534 ret = netvsc_init_buf(device);
540 static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
542 netvsc_destroy_buf(net_device);
546 * netvsc_device_remove - Callback when the root bus device is removed
548 int netvsc_device_remove(struct hv_device *device)
550 struct netvsc_device *net_device;
553 net_device = hv_get_drvdata(device);
555 netvsc_disconnect_vsp(net_device);
558 * Since we have already drained, we don't need to busy wait
559 * as was done in final_release_stor_device()
560 * Note that we cannot set the ext pointer to NULL until
561 * we have drained - to drain the outgoing packets, we need to
562 * allow incoming packets.
565 spin_lock_irqsave(&device->channel->inbound_lock, flags);
566 hv_set_drvdata(device, NULL);
567 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
570 * At this point, no one should be accessing net_device
573 dev_notice(&device->device, "net device safe to remove\n");
575 /* Now, we can close the channel safely */
576 vmbus_close(device->channel);
578 /* Release all resources */
579 vfree(net_device->sub_cb_buf);
580 free_netvsc_device(net_device);
585 #define RING_AVAIL_PERCENT_HIWATER 20
586 #define RING_AVAIL_PERCENT_LOWATER 10
589 * Get the percentage of available bytes to write in the ring.
590 * The return value is in range from 0 to 100.
592 static inline u32 hv_ringbuf_avail_percent(
593 struct hv_ring_buffer_info *ring_info)
595 u32 avail_read, avail_write;
597 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
599 return avail_write * 100 / ring_info->ring_datasize;
602 static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
605 sync_change_bit(index, net_device->send_section_map);
608 static void netvsc_send_completion(struct netvsc_device *net_device,
609 struct vmbus_channel *incoming_channel,
610 struct hv_device *device,
611 struct vmpacket_descriptor *packet)
613 struct nvsp_message *nvsp_packet;
614 struct hv_netvsc_packet *nvsc_packet;
615 struct net_device *ndev;
618 ndev = net_device->ndev;
620 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
621 (packet->offset8 << 3));
623 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
624 (nvsp_packet->hdr.msg_type ==
625 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
626 (nvsp_packet->hdr.msg_type ==
627 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) ||
628 (nvsp_packet->hdr.msg_type ==
629 NVSP_MSG5_TYPE_SUBCHANNEL)) {
630 /* Copy the response back */
631 memcpy(&net_device->channel_init_pkt, nvsp_packet,
632 sizeof(struct nvsp_message));
633 complete(&net_device->channel_init_wait);
634 } else if (nvsp_packet->hdr.msg_type ==
635 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
636 int num_outstanding_sends;
638 struct vmbus_channel *channel = device->channel;
641 /* Get the send context */
642 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
645 /* Notify the layer above us */
647 send_index = nvsc_packet->send_buf_index;
648 if (send_index != NETVSC_INVALID_INDEX)
649 netvsc_free_send_slot(net_device, send_index);
650 q_idx = nvsc_packet->q_idx;
651 channel = incoming_channel;
652 netvsc_xmit_completion(nvsc_packet);
655 num_outstanding_sends =
656 atomic_dec_return(&net_device->num_outstanding_sends);
657 queue_sends = atomic_dec_return(&net_device->
660 if (net_device->destroy && num_outstanding_sends == 0)
661 wake_up(&net_device->wait_drain);
663 if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) &&
664 !net_device->start_remove &&
665 (hv_ringbuf_avail_percent(&channel->outbound) >
666 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1))
667 netif_tx_wake_queue(netdev_get_tx_queue(
670 netdev_err(ndev, "Unknown send completion packet type- "
671 "%d received!!\n", nvsp_packet->hdr.msg_type);
676 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
679 u32 max_words = net_device->map_words;
680 unsigned long *map_addr = (unsigned long *)net_device->send_section_map;
681 u32 section_cnt = net_device->send_section_cnt;
682 int ret_val = NETVSC_INVALID_INDEX;
686 for (i = 0; i < max_words; i++) {
689 index = ffz(map_addr[i]);
690 prev_val = sync_test_and_set_bit(index, &map_addr[i]);
693 if ((index + (i * BITS_PER_LONG)) >= section_cnt)
695 ret_val = (index + (i * BITS_PER_LONG));
701 static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
702 unsigned int section_index,
704 struct hv_netvsc_packet *packet,
705 struct rndis_message *rndis_msg)
707 char *start = net_device->send_buf;
708 char *dest = start + (section_index * net_device->send_section_size)
713 u32 remain = packet->total_data_buflen % net_device->pkt_align;
714 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
715 packet->page_buf_cnt;
718 if (packet->is_data_pkt && packet->xmit_more && remain &&
719 !packet->cp_partial) {
720 padding = net_device->pkt_align - remain;
721 rndis_msg->msg_len += padding;
722 packet->total_data_buflen += padding;
725 for (i = 0; i < page_count; i++) {
726 char *src = phys_to_virt(packet->page_buf[i].pfn << PAGE_SHIFT);
727 u32 offset = packet->page_buf[i].offset;
728 u32 len = packet->page_buf[i].len;
730 memcpy(dest, (src + offset), len);
736 memset(dest, 0, padding);
743 static inline int netvsc_send_pkt(
744 struct hv_netvsc_packet *packet,
745 struct netvsc_device *net_device)
747 struct nvsp_message nvmsg;
748 u16 q_idx = packet->q_idx;
749 struct vmbus_channel *out_channel = net_device->chn_table[q_idx];
750 struct net_device *ndev = net_device->ndev;
753 struct hv_page_buffer *pgbuf;
754 u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound);
756 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
757 if (packet->is_data_pkt) {
759 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0;
761 /* 1 is RMC_CONTROL; */
762 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1;
765 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
766 packet->send_buf_index;
767 if (packet->send_buf_index == NETVSC_INVALID_INDEX)
768 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
770 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size =
771 packet->total_data_buflen;
773 if (packet->completion_func)
774 req_id = (ulong)packet;
778 if (out_channel->rescind)
782 * It is possible that once we successfully place this packet
783 * on the ringbuffer, we may stop the queue. In that case, we want
784 * to notify the host independent of the xmit_more flag. We don't
785 * need to be precise here; in the worst case we may signal the host
788 if (ring_avail < (RING_AVAIL_PERCENT_LOWATER + 1))
789 packet->xmit_more = false;
791 if (packet->page_buf_cnt) {
792 pgbuf = packet->cp_partial ? packet->page_buf +
793 packet->rmsg_pgcnt : packet->page_buf;
794 ret = vmbus_sendpacket_pagebuffer_ctl(out_channel,
796 packet->page_buf_cnt,
798 sizeof(struct nvsp_message),
800 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED,
803 ret = vmbus_sendpacket_ctl(out_channel, &nvmsg,
804 sizeof(struct nvsp_message),
807 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED,
812 atomic_inc(&net_device->num_outstanding_sends);
813 atomic_inc(&net_device->queue_sends[q_idx]);
815 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
816 netif_tx_stop_queue(netdev_get_tx_queue(ndev, q_idx));
818 if (atomic_read(&net_device->
819 queue_sends[q_idx]) < 1)
820 netif_tx_wake_queue(netdev_get_tx_queue(
823 } else if (ret == -EAGAIN) {
824 netif_tx_stop_queue(netdev_get_tx_queue(
826 if (atomic_read(&net_device->queue_sends[q_idx]) < 1) {
827 netif_tx_wake_queue(netdev_get_tx_queue(
832 netdev_err(ndev, "Unable to send packet %p ret %d\n",
839 int netvsc_send(struct hv_device *device,
840 struct hv_netvsc_packet *packet,
841 struct rndis_message *rndis_msg)
843 struct netvsc_device *net_device;
844 int ret = 0, m_ret = 0;
845 struct vmbus_channel *out_channel;
846 u16 q_idx = packet->q_idx;
847 u32 pktlen = packet->total_data_buflen, msd_len = 0;
848 unsigned int section_index = NETVSC_INVALID_INDEX;
849 struct multi_send_data *msdp;
850 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
853 net_device = get_outbound_net_device(device);
857 out_channel = net_device->chn_table[q_idx];
859 packet->send_buf_index = NETVSC_INVALID_INDEX;
860 packet->cp_partial = false;
862 msdp = &net_device->msd[q_idx];
864 /* batch packets in send buffer if possible */
866 msd_len = msdp->pkt->total_data_buflen;
868 try_batch = packet->is_data_pkt && msd_len > 0 && msdp->count <
871 if (try_batch && msd_len + pktlen + net_device->pkt_align <
872 net_device->send_section_size) {
873 section_index = msdp->pkt->send_buf_index;
875 } else if (try_batch && msd_len + packet->rmsg_size <
876 net_device->send_section_size) {
877 section_index = msdp->pkt->send_buf_index;
878 packet->cp_partial = true;
880 } else if (packet->is_data_pkt && pktlen + net_device->pkt_align <
881 net_device->send_section_size) {
882 section_index = netvsc_get_next_send_section(net_device);
883 if (section_index != NETVSC_INVALID_INDEX) {
884 msd_send = msdp->pkt;
891 if (section_index != NETVSC_INVALID_INDEX) {
892 netvsc_copy_to_send_buf(net_device,
893 section_index, msd_len,
896 packet->send_buf_index = section_index;
898 if (packet->cp_partial) {
899 packet->page_buf_cnt -= packet->rmsg_pgcnt;
900 packet->total_data_buflen = msd_len + packet->rmsg_size;
902 packet->page_buf_cnt = 0;
903 packet->total_data_buflen += msd_len;
907 netvsc_xmit_completion(msdp->pkt);
909 if (packet->xmit_more && !packet->cp_partial) {
918 msd_send = msdp->pkt;
925 m_ret = netvsc_send_pkt(msd_send, net_device);
928 netvsc_free_send_slot(net_device,
929 msd_send->send_buf_index);
930 netvsc_xmit_completion(msd_send);
935 ret = netvsc_send_pkt(cur_send, net_device);
937 if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
938 netvsc_free_send_slot(net_device, section_index);
943 static void netvsc_send_recv_completion(struct hv_device *device,
944 struct vmbus_channel *channel,
945 struct netvsc_device *net_device,
946 u64 transaction_id, u32 status)
948 struct nvsp_message recvcompMessage;
951 struct net_device *ndev;
953 ndev = net_device->ndev;
955 recvcompMessage.hdr.msg_type =
956 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
958 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
961 /* Send the completion */
962 ret = vmbus_sendpacket(channel, &recvcompMessage,
963 sizeof(struct nvsp_message), transaction_id,
968 } else if (ret == -EAGAIN) {
969 /* no more room...wait a bit and attempt to retry 3 times */
971 netdev_err(ndev, "unable to send receive completion pkt"
972 " (tid %llx)...retrying %d\n", transaction_id, retries);
976 goto retry_send_cmplt;
978 netdev_err(ndev, "unable to send receive "
979 "completion pkt (tid %llx)...give up retrying\n",
983 netdev_err(ndev, "unable to send receive "
984 "completion pkt - %llx\n", transaction_id);
988 static void netvsc_receive(struct netvsc_device *net_device,
989 struct vmbus_channel *channel,
990 struct hv_device *device,
991 struct vmpacket_descriptor *packet)
993 struct vmtransfer_page_packet_header *vmxferpage_packet;
994 struct nvsp_message *nvsp_packet;
995 struct hv_netvsc_packet nv_pkt;
996 struct hv_netvsc_packet *netvsc_packet = &nv_pkt;
997 u32 status = NVSP_STAT_SUCCESS;
1000 struct net_device *ndev;
1003 ndev = net_device->ndev;
1006 * All inbound packets other than send completion should be xfer page
1009 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
1010 netdev_err(ndev, "Unknown packet type received - %d\n",
1015 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
1016 (packet->offset8 << 3));
1018 /* Make sure this is a valid nvsp packet */
1019 if (nvsp_packet->hdr.msg_type !=
1020 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
1021 netdev_err(ndev, "Unknown nvsp packet type received-"
1022 " %d\n", nvsp_packet->hdr.msg_type);
1026 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
1028 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
1029 netdev_err(ndev, "Invalid xfer page set id - "
1030 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
1031 vmxferpage_packet->xfer_pageset_id);
1035 count = vmxferpage_packet->range_cnt;
1037 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1038 for (i = 0; i < count; i++) {
1039 /* Initialize the netvsc packet */
1040 netvsc_packet->status = NVSP_STAT_SUCCESS;
1041 data = (void *)((unsigned long)net_device->
1042 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
1043 netvsc_packet->total_data_buflen =
1044 vmxferpage_packet->ranges[i].byte_count;
1046 /* Pass it to the upper layer */
1047 rndis_filter_receive(device, netvsc_packet, &data, channel);
1049 if (netvsc_packet->status != NVSP_STAT_SUCCESS)
1050 status = NVSP_STAT_FAIL;
1053 netvsc_send_recv_completion(device, channel, net_device,
1054 vmxferpage_packet->d.trans_id, status);
1058 static void netvsc_send_table(struct hv_device *hdev,
1059 struct nvsp_message *nvmsg)
1061 struct netvsc_device *nvscdev;
1062 struct net_device *ndev;
1066 nvscdev = get_outbound_net_device(hdev);
1069 ndev = nvscdev->ndev;
1071 count = nvmsg->msg.v5_msg.send_table.count;
1072 if (count != VRSS_SEND_TAB_SIZE) {
1073 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1077 tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
1078 nvmsg->msg.v5_msg.send_table.offset);
1080 for (i = 0; i < count; i++)
1081 nvscdev->send_table[i] = tab[i];
1084 static void netvsc_send_vf(struct netvsc_device *nvdev,
1085 struct nvsp_message *nvmsg)
1087 nvdev->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1088 nvdev->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1091 static inline void netvsc_receive_inband(struct hv_device *hdev,
1092 struct netvsc_device *nvdev,
1093 struct nvsp_message *nvmsg)
1095 switch (nvmsg->hdr.msg_type) {
1096 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1097 netvsc_send_table(hdev, nvmsg);
1100 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1101 netvsc_send_vf(nvdev, nvmsg);
1106 void netvsc_channel_cb(void *context)
1109 struct vmbus_channel *channel = (struct vmbus_channel *)context;
1110 struct hv_device *device;
1111 struct netvsc_device *net_device;
1114 struct vmpacket_descriptor *desc;
1115 unsigned char *buffer;
1116 int bufferlen = NETVSC_PACKET_SIZE;
1117 struct net_device *ndev;
1118 struct nvsp_message *nvmsg;
1120 if (channel->primary_channel != NULL)
1121 device = channel->primary_channel->device_obj;
1123 device = channel->device_obj;
1125 net_device = get_inbound_net_device(device);
1128 ndev = net_device->ndev;
1129 buffer = get_per_channel_state(channel);
1132 ret = vmbus_recvpacket_raw(channel, buffer, bufferlen,
1133 &bytes_recvd, &request_id);
1135 if (bytes_recvd > 0) {
1136 desc = (struct vmpacket_descriptor *)buffer;
1137 nvmsg = (struct nvsp_message *)((unsigned long)
1138 desc + (desc->offset8 << 3));
1139 switch (desc->type) {
1141 netvsc_send_completion(net_device,
1146 case VM_PKT_DATA_USING_XFER_PAGES:
1147 netvsc_receive(net_device, channel,
1151 case VM_PKT_DATA_INBAND:
1152 netvsc_receive_inband(device,
1159 "unhandled packet type %d, "
1160 "tid %llx len %d\n",
1161 desc->type, request_id,
1168 * We are done for this pass.
1173 } else if (ret == -ENOBUFS) {
1174 if (bufferlen > NETVSC_PACKET_SIZE)
1176 /* Handle large packet */
1177 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
1178 if (buffer == NULL) {
1179 /* Try again next time around */
1181 "unable to allocate buffer of size "
1182 "(%d)!!\n", bytes_recvd);
1186 bufferlen = bytes_recvd;
1190 if (bufferlen > NETVSC_PACKET_SIZE)
1196 * netvsc_device_add - Callback when the device belonging to this
1199 int netvsc_device_add(struct hv_device *device, void *additional_info)
1203 ((struct netvsc_device_info *)additional_info)->ring_size;
1204 struct netvsc_device *net_device;
1205 struct net_device *ndev;
1207 net_device = alloc_net_device(device);
1211 net_device->ring_size = ring_size;
1214 * Coming into this function, struct net_device * is
1215 * registered as the driver private data.
1216 * In alloc_net_device(), we register struct netvsc_device *
1217 * as the driver private data and stash away struct net_device *
1218 * in struct netvsc_device *.
1220 ndev = net_device->ndev;
1222 /* Add netvsc_device context to netvsc_device */
1223 net_device->nd_ctx = netdev_priv(ndev);
1225 /* Initialize the NetVSC channel extension */
1226 init_completion(&net_device->channel_init_wait);
1228 set_per_channel_state(device->channel, net_device->cb_buffer);
1230 /* Open the channel */
1231 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
1232 ring_size * PAGE_SIZE, NULL, 0,
1233 netvsc_channel_cb, device->channel);
1236 netdev_err(ndev, "unable to open channel: %d\n", ret);
1240 /* Channel is opened */
1241 pr_info("hv_netvsc channel opened successfully\n");
1243 net_device->chn_table[0] = device->channel;
1245 /* Connect with the NetVsp */
1246 ret = netvsc_connect_vsp(device);
1249 "unable to connect to NetVSP - %d\n", ret);
1256 /* Now, we can close the channel safely */
1257 vmbus_close(device->channel);
1260 free_netvsc_device(net_device);