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 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_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 vfree(net_device
->recv_buf
);
141 net_device
->recv_buf
= NULL
;
144 if (net_device
->recv_section
) {
145 net_device
->recv_section_cnt
= 0;
146 kfree(net_device
->recv_section
);
147 net_device
->recv_section
= NULL
;
150 /* Deal with the send buffer we may have setup.
151 * If we got a send section size, it means we received a
152 * SendsendBufferComplete msg (ie sent
153 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
154 * to send a revoke msg here
156 if (net_device
->send_section_size
) {
157 /* Send the revoke receive buffer */
158 revoke_packet
= &net_device
->revoke_packet
;
159 memset(revoke_packet
, 0, sizeof(struct nvsp_message
));
161 revoke_packet
->hdr
.msg_type
=
162 NVSP_MSG1_TYPE_REVOKE_SEND_BUF
;
163 revoke_packet
->msg
.v1_msg
.revoke_recv_buf
.id
= 0;
165 ret
= vmbus_sendpacket(net_device
->dev
->channel
,
167 sizeof(struct nvsp_message
),
168 (unsigned long)revoke_packet
,
169 VM_PKT_DATA_INBAND
, 0);
170 /* If we failed here, we might as well return and
171 * have a leak rather than continue and a bugchk
174 netdev_err(ndev
, "unable to send "
175 "revoke send buffer to netvsp\n");
179 /* Teardown the gpadl on the vsp end */
180 if (net_device
->send_buf_gpadl_handle
) {
181 ret
= vmbus_teardown_gpadl(net_device
->dev
->channel
,
182 net_device
->send_buf_gpadl_handle
);
184 /* If we failed here, we might as well return and have a leak
185 * rather than continue and a bugchk
189 "unable to teardown send buffer's gpadl\n");
192 net_device
->send_buf_gpadl_handle
= 0;
194 if (net_device
->send_buf
) {
195 /* Free up the receive buffer */
196 vfree(net_device
->send_buf
);
197 net_device
->send_buf
= NULL
;
199 kfree(net_device
->send_section_map
);
204 static int netvsc_init_buf(struct hv_device
*device
)
208 struct netvsc_device
*net_device
;
209 struct nvsp_message
*init_packet
;
210 struct net_device
*ndev
;
212 net_device
= get_outbound_net_device(device
);
215 ndev
= net_device
->ndev
;
217 net_device
->recv_buf
= vzalloc(net_device
->recv_buf_size
);
218 if (!net_device
->recv_buf
) {
219 netdev_err(ndev
, "unable to allocate receive "
220 "buffer of size %d\n", net_device
->recv_buf_size
);
226 * Establish the gpadl handle for this buffer on this
227 * channel. Note: This call uses the vmbus connection rather
228 * than the channel to establish the gpadl handle.
230 ret
= vmbus_establish_gpadl(device
->channel
, net_device
->recv_buf
,
231 net_device
->recv_buf_size
,
232 &net_device
->recv_buf_gpadl_handle
);
235 "unable to establish receive buffer's gpadl\n");
240 /* Notify the NetVsp of the gpadl handle */
241 init_packet
= &net_device
->channel_init_pkt
;
243 memset(init_packet
, 0, sizeof(struct nvsp_message
));
245 init_packet
->hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_RECV_BUF
;
246 init_packet
->msg
.v1_msg
.send_recv_buf
.
247 gpadl_handle
= net_device
->recv_buf_gpadl_handle
;
248 init_packet
->msg
.v1_msg
.
249 send_recv_buf
.id
= NETVSC_RECEIVE_BUFFER_ID
;
251 /* Send the gpadl notification request */
252 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
253 sizeof(struct nvsp_message
),
254 (unsigned long)init_packet
,
256 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
259 "unable to send receive buffer's gpadl to netvsp\n");
263 t
= wait_for_completion_timeout(&net_device
->channel_init_wait
, 5*HZ
);
267 /* Check the response */
268 if (init_packet
->msg
.v1_msg
.
269 send_recv_buf_complete
.status
!= NVSP_STAT_SUCCESS
) {
270 netdev_err(ndev
, "Unable to complete receive buffer "
271 "initialization with NetVsp - status %d\n",
272 init_packet
->msg
.v1_msg
.
273 send_recv_buf_complete
.status
);
278 /* Parse the response */
280 net_device
->recv_section_cnt
= init_packet
->msg
.
281 v1_msg
.send_recv_buf_complete
.num_sections
;
283 net_device
->recv_section
= kmemdup(
284 init_packet
->msg
.v1_msg
.send_recv_buf_complete
.sections
,
285 net_device
->recv_section_cnt
*
286 sizeof(struct nvsp_1_receive_buffer_section
),
288 if (net_device
->recv_section
== NULL
) {
294 * For 1st release, there should only be 1 section that represents the
295 * entire receive buffer
297 if (net_device
->recv_section_cnt
!= 1 ||
298 net_device
->recv_section
->offset
!= 0) {
303 /* Now setup the send buffer.
305 net_device
->send_buf
= vzalloc(net_device
->send_buf_size
);
306 if (!net_device
->send_buf
) {
307 netdev_err(ndev
, "unable to allocate send "
308 "buffer of size %d\n", net_device
->send_buf_size
);
313 /* Establish the gpadl handle for this buffer on this
314 * channel. Note: This call uses the vmbus connection rather
315 * than the channel to establish the gpadl handle.
317 ret
= vmbus_establish_gpadl(device
->channel
, net_device
->send_buf
,
318 net_device
->send_buf_size
,
319 &net_device
->send_buf_gpadl_handle
);
322 "unable to establish send buffer's gpadl\n");
326 /* Notify the NetVsp of the gpadl handle */
327 init_packet
= &net_device
->channel_init_pkt
;
328 memset(init_packet
, 0, sizeof(struct nvsp_message
));
329 init_packet
->hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_SEND_BUF
;
330 init_packet
->msg
.v1_msg
.send_recv_buf
.gpadl_handle
=
331 net_device
->send_buf_gpadl_handle
;
332 init_packet
->msg
.v1_msg
.send_recv_buf
.id
= 0;
334 /* Send the gpadl notification request */
335 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
336 sizeof(struct nvsp_message
),
337 (unsigned long)init_packet
,
339 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
342 "unable to send send buffer's gpadl to netvsp\n");
346 t
= wait_for_completion_timeout(&net_device
->channel_init_wait
, 5*HZ
);
349 /* Check the response */
350 if (init_packet
->msg
.v1_msg
.
351 send_send_buf_complete
.status
!= NVSP_STAT_SUCCESS
) {
352 netdev_err(ndev
, "Unable to complete send buffer "
353 "initialization with NetVsp - status %d\n",
354 init_packet
->msg
.v1_msg
.
355 send_recv_buf_complete
.status
);
360 /* Parse the response */
361 net_device
->send_section_size
= init_packet
->msg
.
362 v1_msg
.send_send_buf_complete
.section_size
;
364 /* Section count is simply the size divided by the section size.
366 net_device
->send_section_cnt
=
367 net_device
->send_buf_size
/net_device
->send_section_size
;
369 dev_info(&device
->device
, "Send section size: %d, Section count:%d\n",
370 net_device
->send_section_size
, net_device
->send_section_cnt
);
372 /* Setup state for managing the send buffer. */
373 net_device
->map_words
= DIV_ROUND_UP(net_device
->send_section_cnt
,
376 net_device
->send_section_map
=
377 kzalloc(net_device
->map_words
* sizeof(ulong
), GFP_KERNEL
);
378 if (net_device
->send_section_map
== NULL
) {
386 netvsc_destroy_buf(net_device
);
393 /* Negotiate NVSP protocol version */
394 static int negotiate_nvsp_ver(struct hv_device
*device
,
395 struct netvsc_device
*net_device
,
396 struct nvsp_message
*init_packet
,
401 memset(init_packet
, 0, sizeof(struct nvsp_message
));
402 init_packet
->hdr
.msg_type
= NVSP_MSG_TYPE_INIT
;
403 init_packet
->msg
.init_msg
.init
.min_protocol_ver
= nvsp_ver
;
404 init_packet
->msg
.init_msg
.init
.max_protocol_ver
= nvsp_ver
;
406 /* Send the init request */
407 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
408 sizeof(struct nvsp_message
),
409 (unsigned long)init_packet
,
411 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
416 t
= wait_for_completion_timeout(&net_device
->channel_init_wait
, 5*HZ
);
421 if (init_packet
->msg
.init_msg
.init_complete
.status
!=
425 if (nvsp_ver
== NVSP_PROTOCOL_VERSION_1
)
428 /* NVSPv2 only: Send NDIS config */
429 memset(init_packet
, 0, sizeof(struct nvsp_message
));
430 init_packet
->hdr
.msg_type
= NVSP_MSG2_TYPE_SEND_NDIS_CONFIG
;
431 init_packet
->msg
.v2_msg
.send_ndis_config
.mtu
= net_device
->ndev
->mtu
;
432 init_packet
->msg
.v2_msg
.send_ndis_config
.capability
.ieee8021q
= 1;
434 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
435 sizeof(struct nvsp_message
),
436 (unsigned long)init_packet
,
437 VM_PKT_DATA_INBAND
, 0);
442 static int netvsc_connect_vsp(struct hv_device
*device
)
445 struct netvsc_device
*net_device
;
446 struct nvsp_message
*init_packet
;
448 struct net_device
*ndev
;
449 u32 ver_list
[] = { NVSP_PROTOCOL_VERSION_1
, NVSP_PROTOCOL_VERSION_2
,
450 NVSP_PROTOCOL_VERSION_4
, NVSP_PROTOCOL_VERSION_5
};
451 int i
, num_ver
= 4; /* number of different NVSP versions */
453 net_device
= get_outbound_net_device(device
);
456 ndev
= net_device
->ndev
;
458 init_packet
= &net_device
->channel_init_pkt
;
460 /* Negotiate the latest NVSP protocol supported */
461 for (i
= num_ver
- 1; i
>= 0; i
--)
462 if (negotiate_nvsp_ver(device
, net_device
, init_packet
,
464 net_device
->nvsp_version
= ver_list
[i
];
473 pr_debug("Negotiated NVSP version:%x\n", net_device
->nvsp_version
);
475 /* Send the ndis version */
476 memset(init_packet
, 0, sizeof(struct nvsp_message
));
478 if (net_device
->nvsp_version
<= NVSP_PROTOCOL_VERSION_4
)
479 ndis_version
= 0x00060001;
481 ndis_version
= 0x0006001e;
483 init_packet
->hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_NDIS_VER
;
484 init_packet
->msg
.v1_msg
.
485 send_ndis_ver
.ndis_major_ver
=
486 (ndis_version
& 0xFFFF0000) >> 16;
487 init_packet
->msg
.v1_msg
.
488 send_ndis_ver
.ndis_minor_ver
=
489 ndis_version
& 0xFFFF;
491 /* Send the init request */
492 ret
= vmbus_sendpacket(device
->channel
, init_packet
,
493 sizeof(struct nvsp_message
),
494 (unsigned long)init_packet
,
495 VM_PKT_DATA_INBAND
, 0);
499 /* Post the big receive buffer to NetVSP */
500 if (net_device
->nvsp_version
<= NVSP_PROTOCOL_VERSION_2
)
501 net_device
->recv_buf_size
= NETVSC_RECEIVE_BUFFER_SIZE_LEGACY
;
503 net_device
->recv_buf_size
= NETVSC_RECEIVE_BUFFER_SIZE
;
504 net_device
->send_buf_size
= NETVSC_SEND_BUFFER_SIZE
;
506 ret
= netvsc_init_buf(device
);
512 static void netvsc_disconnect_vsp(struct netvsc_device
*net_device
)
514 netvsc_destroy_buf(net_device
);
518 * netvsc_device_remove - Callback when the root bus device is removed
520 int netvsc_device_remove(struct hv_device
*device
)
522 struct netvsc_device
*net_device
;
525 net_device
= hv_get_drvdata(device
);
527 netvsc_disconnect_vsp(net_device
);
530 * Since we have already drained, we don't need to busy wait
531 * as was done in final_release_stor_device()
532 * Note that we cannot set the ext pointer to NULL until
533 * we have drained - to drain the outgoing packets, we need to
534 * allow incoming packets.
537 spin_lock_irqsave(&device
->channel
->inbound_lock
, flags
);
538 hv_set_drvdata(device
, NULL
);
539 spin_unlock_irqrestore(&device
->channel
->inbound_lock
, flags
);
542 * At this point, no one should be accessing net_device
545 dev_notice(&device
->device
, "net device safe to remove\n");
547 /* Now, we can close the channel safely */
548 vmbus_close(device
->channel
);
550 /* Release all resources */
551 if (net_device
->sub_cb_buf
)
552 vfree(net_device
->sub_cb_buf
);
559 #define RING_AVAIL_PERCENT_HIWATER 20
560 #define RING_AVAIL_PERCENT_LOWATER 10
563 * Get the percentage of available bytes to write in the ring.
564 * The return value is in range from 0 to 100.
566 static inline u32
hv_ringbuf_avail_percent(
567 struct hv_ring_buffer_info
*ring_info
)
569 u32 avail_read
, avail_write
;
571 hv_get_ringbuffer_availbytes(ring_info
, &avail_read
, &avail_write
);
573 return avail_write
* 100 / ring_info
->ring_datasize
;
576 static inline void netvsc_free_send_slot(struct netvsc_device
*net_device
,
579 sync_change_bit(index
, net_device
->send_section_map
);
582 static void netvsc_send_completion(struct netvsc_device
*net_device
,
583 struct hv_device
*device
,
584 struct vmpacket_descriptor
*packet
)
586 struct nvsp_message
*nvsp_packet
;
587 struct hv_netvsc_packet
*nvsc_packet
;
588 struct net_device
*ndev
;
591 ndev
= net_device
->ndev
;
593 nvsp_packet
= (struct nvsp_message
*)((unsigned long)packet
+
594 (packet
->offset8
<< 3));
596 if ((nvsp_packet
->hdr
.msg_type
== NVSP_MSG_TYPE_INIT_COMPLETE
) ||
597 (nvsp_packet
->hdr
.msg_type
==
598 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE
) ||
599 (nvsp_packet
->hdr
.msg_type
==
600 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE
) ||
601 (nvsp_packet
->hdr
.msg_type
==
602 NVSP_MSG5_TYPE_SUBCHANNEL
)) {
603 /* Copy the response back */
604 memcpy(&net_device
->channel_init_pkt
, nvsp_packet
,
605 sizeof(struct nvsp_message
));
606 complete(&net_device
->channel_init_wait
);
607 } else if (nvsp_packet
->hdr
.msg_type
==
608 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE
) {
609 int num_outstanding_sends
;
611 struct vmbus_channel
*channel
= device
->channel
;
614 /* Get the send context */
615 nvsc_packet
= (struct hv_netvsc_packet
*)(unsigned long)
618 /* Notify the layer above us */
620 send_index
= nvsc_packet
->send_buf_index
;
621 if (send_index
!= NETVSC_INVALID_INDEX
)
622 netvsc_free_send_slot(net_device
, send_index
);
623 q_idx
= nvsc_packet
->q_idx
;
624 channel
= nvsc_packet
->channel
;
625 nvsc_packet
->send_completion(nvsc_packet
->
626 send_completion_ctx
);
629 num_outstanding_sends
=
630 atomic_dec_return(&net_device
->num_outstanding_sends
);
631 queue_sends
= atomic_dec_return(&net_device
->
634 if (net_device
->destroy
&& num_outstanding_sends
== 0)
635 wake_up(&net_device
->wait_drain
);
637 if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev
, q_idx
)) &&
638 !net_device
->start_remove
&&
639 (hv_ringbuf_avail_percent(&channel
->outbound
) >
640 RING_AVAIL_PERCENT_HIWATER
|| queue_sends
< 1))
641 netif_tx_wake_queue(netdev_get_tx_queue(
644 netdev_err(ndev
, "Unknown send completion packet type- "
645 "%d received!!\n", nvsp_packet
->hdr
.msg_type
);
650 static u32
netvsc_get_next_send_section(struct netvsc_device
*net_device
)
653 u32 max_words
= net_device
->map_words
;
654 unsigned long *map_addr
= (unsigned long *)net_device
->send_section_map
;
655 u32 section_cnt
= net_device
->send_section_cnt
;
656 int ret_val
= NETVSC_INVALID_INDEX
;
660 for (i
= 0; i
< max_words
; i
++) {
663 index
= ffz(map_addr
[i
]);
664 prev_val
= sync_test_and_set_bit(index
, &map_addr
[i
]);
667 if ((index
+ (i
* BITS_PER_LONG
)) >= section_cnt
)
669 ret_val
= (index
+ (i
* BITS_PER_LONG
));
675 u32
netvsc_copy_to_send_buf(struct netvsc_device
*net_device
,
676 unsigned int section_index
,
677 struct hv_netvsc_packet
*packet
)
679 char *start
= net_device
->send_buf
;
680 char *dest
= (start
+ (section_index
* net_device
->send_section_size
));
684 for (i
= 0; i
< packet
->page_buf_cnt
; i
++) {
685 char *src
= phys_to_virt(packet
->page_buf
[i
].pfn
<< PAGE_SHIFT
);
686 u32 offset
= packet
->page_buf
[i
].offset
;
687 u32 len
= packet
->page_buf
[i
].len
;
689 memcpy(dest
, (src
+ offset
), len
);
696 int netvsc_send(struct hv_device
*device
,
697 struct hv_netvsc_packet
*packet
)
699 struct netvsc_device
*net_device
;
701 struct nvsp_message sendMessage
;
702 struct net_device
*ndev
;
703 struct vmbus_channel
*out_channel
= NULL
;
705 unsigned int section_index
= NETVSC_INVALID_INDEX
;
710 net_device
= get_outbound_net_device(device
);
713 ndev
= net_device
->ndev
;
715 sendMessage
.hdr
.msg_type
= NVSP_MSG1_TYPE_SEND_RNDIS_PKT
;
716 if (packet
->is_data_pkt
) {
718 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.channel_type
= 0;
720 /* 1 is RMC_CONTROL; */
721 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.channel_type
= 1;
724 /* Attempt to send via sendbuf */
725 if (packet
->total_data_buflen
< net_device
->send_section_size
) {
726 section_index
= netvsc_get_next_send_section(net_device
);
727 if (section_index
!= NETVSC_INVALID_INDEX
) {
728 msg_size
= netvsc_copy_to_send_buf(net_device
,
731 skb
= (struct sk_buff
*)
732 (unsigned long)packet
->send_completion_tid
;
734 dev_kfree_skb_any(skb
);
735 packet
->page_buf_cnt
= 0;
738 packet
->send_buf_index
= section_index
;
741 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.send_buf_section_index
=
743 sendMessage
.msg
.v1_msg
.send_rndis_pkt
.send_buf_section_size
= msg_size
;
745 if (packet
->send_completion
)
746 req_id
= (ulong
)packet
;
750 out_channel
= net_device
->chn_table
[packet
->q_idx
];
751 if (out_channel
== NULL
)
752 out_channel
= device
->channel
;
753 packet
->channel
= out_channel
;
755 if (packet
->page_buf_cnt
) {
756 ret
= vmbus_sendpacket_pagebuffer(out_channel
,
758 packet
->page_buf_cnt
,
760 sizeof(struct nvsp_message
),
763 ret
= vmbus_sendpacket(out_channel
, &sendMessage
,
764 sizeof(struct nvsp_message
),
767 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
);
771 atomic_inc(&net_device
->num_outstanding_sends
);
772 atomic_inc(&net_device
->queue_sends
[packet
->q_idx
]);
774 if (hv_ringbuf_avail_percent(&out_channel
->outbound
) <
775 RING_AVAIL_PERCENT_LOWATER
) {
776 netif_tx_stop_queue(netdev_get_tx_queue(
777 ndev
, packet
->q_idx
));
779 if (atomic_read(&net_device
->
780 queue_sends
[packet
->q_idx
]) < 1)
781 netif_tx_wake_queue(netdev_get_tx_queue(
782 ndev
, packet
->q_idx
));
784 } else if (ret
== -EAGAIN
) {
785 netif_tx_stop_queue(netdev_get_tx_queue(
786 ndev
, packet
->q_idx
));
787 if (atomic_read(&net_device
->queue_sends
[packet
->q_idx
]) < 1) {
788 netif_tx_wake_queue(netdev_get_tx_queue(
789 ndev
, packet
->q_idx
));
793 netdev_err(ndev
, "Unable to send packet %p ret %d\n",
800 static void netvsc_send_recv_completion(struct hv_device
*device
,
801 struct vmbus_channel
*channel
,
802 struct netvsc_device
*net_device
,
803 u64 transaction_id
, u32 status
)
805 struct nvsp_message recvcompMessage
;
808 struct net_device
*ndev
;
810 ndev
= net_device
->ndev
;
812 recvcompMessage
.hdr
.msg_type
=
813 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE
;
815 recvcompMessage
.msg
.v1_msg
.send_rndis_pkt_complete
.status
= status
;
818 /* Send the completion */
819 ret
= vmbus_sendpacket(channel
, &recvcompMessage
,
820 sizeof(struct nvsp_message
), transaction_id
,
825 } else if (ret
== -EAGAIN
) {
826 /* no more room...wait a bit and attempt to retry 3 times */
828 netdev_err(ndev
, "unable to send receive completion pkt"
829 " (tid %llx)...retrying %d\n", transaction_id
, retries
);
833 goto retry_send_cmplt
;
835 netdev_err(ndev
, "unable to send receive "
836 "completion pkt (tid %llx)...give up retrying\n",
840 netdev_err(ndev
, "unable to send receive "
841 "completion pkt - %llx\n", transaction_id
);
845 static void netvsc_receive(struct netvsc_device
*net_device
,
846 struct vmbus_channel
*channel
,
847 struct hv_device
*device
,
848 struct vmpacket_descriptor
*packet
)
850 struct vmtransfer_page_packet_header
*vmxferpage_packet
;
851 struct nvsp_message
*nvsp_packet
;
852 struct hv_netvsc_packet nv_pkt
;
853 struct hv_netvsc_packet
*netvsc_packet
= &nv_pkt
;
854 u32 status
= NVSP_STAT_SUCCESS
;
857 struct net_device
*ndev
;
859 ndev
= net_device
->ndev
;
862 * All inbound packets other than send completion should be xfer page
865 if (packet
->type
!= VM_PKT_DATA_USING_XFER_PAGES
) {
866 netdev_err(ndev
, "Unknown packet type received - %d\n",
871 nvsp_packet
= (struct nvsp_message
*)((unsigned long)packet
+
872 (packet
->offset8
<< 3));
874 /* Make sure this is a valid nvsp packet */
875 if (nvsp_packet
->hdr
.msg_type
!=
876 NVSP_MSG1_TYPE_SEND_RNDIS_PKT
) {
877 netdev_err(ndev
, "Unknown nvsp packet type received-"
878 " %d\n", nvsp_packet
->hdr
.msg_type
);
882 vmxferpage_packet
= (struct vmtransfer_page_packet_header
*)packet
;
884 if (vmxferpage_packet
->xfer_pageset_id
!= NETVSC_RECEIVE_BUFFER_ID
) {
885 netdev_err(ndev
, "Invalid xfer page set id - "
886 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID
,
887 vmxferpage_packet
->xfer_pageset_id
);
891 count
= vmxferpage_packet
->range_cnt
;
892 netvsc_packet
->device
= device
;
893 netvsc_packet
->channel
= channel
;
895 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
896 for (i
= 0; i
< count
; i
++) {
897 /* Initialize the netvsc packet */
898 netvsc_packet
->status
= NVSP_STAT_SUCCESS
;
899 netvsc_packet
->data
= (void *)((unsigned long)net_device
->
900 recv_buf
+ vmxferpage_packet
->ranges
[i
].byte_offset
);
901 netvsc_packet
->total_data_buflen
=
902 vmxferpage_packet
->ranges
[i
].byte_count
;
904 /* Pass it to the upper layer */
905 rndis_filter_receive(device
, netvsc_packet
);
907 if (netvsc_packet
->status
!= NVSP_STAT_SUCCESS
)
908 status
= NVSP_STAT_FAIL
;
911 netvsc_send_recv_completion(device
, channel
, net_device
,
912 vmxferpage_packet
->d
.trans_id
, status
);
916 static void netvsc_send_table(struct hv_device
*hdev
,
917 struct vmpacket_descriptor
*vmpkt
)
919 struct netvsc_device
*nvscdev
;
920 struct net_device
*ndev
;
921 struct nvsp_message
*nvmsg
;
925 nvscdev
= get_outbound_net_device(hdev
);
928 ndev
= nvscdev
->ndev
;
930 nvmsg
= (struct nvsp_message
*)((unsigned long)vmpkt
+
931 (vmpkt
->offset8
<< 3));
933 if (nvmsg
->hdr
.msg_type
!= NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE
)
936 count
= nvmsg
->msg
.v5_msg
.send_table
.count
;
937 if (count
!= VRSS_SEND_TAB_SIZE
) {
938 netdev_err(ndev
, "Received wrong send-table size:%u\n", count
);
942 tab
= (u32
*)((unsigned long)&nvmsg
->msg
.v5_msg
.send_table
+
943 nvmsg
->msg
.v5_msg
.send_table
.offset
);
945 for (i
= 0; i
< count
; i
++)
946 nvscdev
->send_table
[i
] = tab
[i
];
949 void netvsc_channel_cb(void *context
)
952 struct vmbus_channel
*channel
= (struct vmbus_channel
*)context
;
953 struct hv_device
*device
;
954 struct netvsc_device
*net_device
;
957 struct vmpacket_descriptor
*desc
;
958 unsigned char *buffer
;
959 int bufferlen
= NETVSC_PACKET_SIZE
;
960 struct net_device
*ndev
;
962 if (channel
->primary_channel
!= NULL
)
963 device
= channel
->primary_channel
->device_obj
;
965 device
= channel
->device_obj
;
967 net_device
= get_inbound_net_device(device
);
970 ndev
= net_device
->ndev
;
971 buffer
= get_per_channel_state(channel
);
974 ret
= vmbus_recvpacket_raw(channel
, buffer
, bufferlen
,
975 &bytes_recvd
, &request_id
);
977 if (bytes_recvd
> 0) {
978 desc
= (struct vmpacket_descriptor
*)buffer
;
979 switch (desc
->type
) {
981 netvsc_send_completion(net_device
,
985 case VM_PKT_DATA_USING_XFER_PAGES
:
986 netvsc_receive(net_device
, channel
,
990 case VM_PKT_DATA_INBAND
:
991 netvsc_send_table(device
, desc
);
996 "unhandled packet type %d, "
998 desc
->type
, request_id
,
1005 * We are done for this pass.
1010 } else if (ret
== -ENOBUFS
) {
1011 if (bufferlen
> NETVSC_PACKET_SIZE
)
1013 /* Handle large packet */
1014 buffer
= kmalloc(bytes_recvd
, GFP_ATOMIC
);
1015 if (buffer
== NULL
) {
1016 /* Try again next time around */
1018 "unable to allocate buffer of size "
1019 "(%d)!!\n", bytes_recvd
);
1023 bufferlen
= bytes_recvd
;
1027 if (bufferlen
> NETVSC_PACKET_SIZE
)
1033 * netvsc_device_add - Callback when the device belonging to this
1036 int netvsc_device_add(struct hv_device
*device
, void *additional_info
)
1040 ((struct netvsc_device_info
*)additional_info
)->ring_size
;
1041 struct netvsc_device
*net_device
;
1042 struct net_device
*ndev
;
1044 net_device
= alloc_net_device(device
);
1050 net_device
->ring_size
= ring_size
;
1053 * Coming into this function, struct net_device * is
1054 * registered as the driver private data.
1055 * In alloc_net_device(), we register struct netvsc_device *
1056 * as the driver private data and stash away struct net_device *
1057 * in struct netvsc_device *.
1059 ndev
= net_device
->ndev
;
1061 /* Initialize the NetVSC channel extension */
1062 init_completion(&net_device
->channel_init_wait
);
1064 set_per_channel_state(device
->channel
, net_device
->cb_buffer
);
1066 /* Open the channel */
1067 ret
= vmbus_open(device
->channel
, ring_size
* PAGE_SIZE
,
1068 ring_size
* PAGE_SIZE
, NULL
, 0,
1069 netvsc_channel_cb
, device
->channel
);
1072 netdev_err(ndev
, "unable to open channel: %d\n", ret
);
1076 /* Channel is opened */
1077 pr_info("hv_netvsc channel opened successfully\n");
1079 net_device
->chn_table
[0] = device
->channel
;
1081 /* Connect with the NetVsp */
1082 ret
= netvsc_connect_vsp(device
);
1085 "unable to connect to NetVSP - %d\n", ret
);
1092 /* Now, we can close the channel safely */
1093 vmbus_close(device
->channel
);