/*
* Net VSC on receive completion
*
* Send a receive completion packet to RNDIS device (ie NetVsp)
*/
static void
hv_nv_on_receive_completion(struct vmbus_channel *chan, uint64_t tid,
uint32_t status)
{
nvsp_msg rx_comp_msg;
int retries = 0;
int ret = 0;
rx_comp_msg.hdr.msg_type = nvsp_msg_1_type_send_rndis_pkt_complete;
/* Pass in the status */
rx_comp_msg.msgs.vers_1_msgs.send_rndis_pkt_complete.status =
status;
retry_send_cmplt:
/* Send the completion */
ret = vmbus_chan_send(chan, VMBUS_CHANPKT_TYPE_COMP, 0,
&rx_comp_msg, sizeof(nvsp_msg), tid);
if (ret == 0) {
/* success */
/* no-op */
} else if (ret == EAGAIN) {
/* no more room... wait a bit and attempt to retry 3 times */
retries++;
if (retries < 4) {
DELAY(100);
goto retry_send_cmplt;
}
}
}
/*
* Attempt to negotiate the caller-specified NVSP version
*
* For NVSP v2, Server 2008 R2 does not set
* init_pkt->msgs.init_msgs.init_compl.negotiated_prot_vers
* to the negotiated version, so we cannot rely on that.
*/
static int
hv_nv_negotiate_nvsp_protocol(struct hn_softc *sc, netvsc_dev *net_dev,
uint32_t nvsp_ver)
{
nvsp_msg *init_pkt;
int ret;
init_pkt = &net_dev->channel_init_packet;
memset(init_pkt, 0, sizeof(nvsp_msg));
init_pkt->hdr.msg_type = nvsp_msg_type_init;
/*
* Specify parameter as the only acceptable protocol version
*/
init_pkt->msgs.init_msgs.init.p1.protocol_version = nvsp_ver;
init_pkt->msgs.init_msgs.init.protocol_version_2 = nvsp_ver;
/* Send the init request */
ret = vmbus_chan_send(sc->hn_prichan,
VMBUS_CHANPKT_TYPE_INBAND, VMBUS_CHANPKT_FLAG_RC,
init_pkt, sizeof(nvsp_msg), (uint64_t)(uintptr_t)init_pkt);
if (ret != 0)
return (-1);
sema_wait(&net_dev->channel_init_sema);
if (init_pkt->msgs.init_msgs.init_compl.status != nvsp_status_success)
return (EINVAL);
return (0);
}
/*
* Net VSC on send
* Sends a packet on the specified Hyper-V device.
* Returns 0 on success, non-zero on failure.
*/
int
hv_nv_on_send(struct vmbus_channel *chan, netvsc_packet *pkt)
{
nvsp_msg send_msg;
int ret;
send_msg.hdr.msg_type = nvsp_msg_1_type_send_rndis_pkt;
if (pkt->is_data_pkt) {
/* 0 is RMC_DATA */
send_msg.msgs.vers_1_msgs.send_rndis_pkt.chan_type = 0;
} else {
/* 1 is RMC_CONTROL */
send_msg.msgs.vers_1_msgs.send_rndis_pkt.chan_type = 1;
}
send_msg.msgs.vers_1_msgs.send_rndis_pkt.send_buf_section_idx =
pkt->send_buf_section_idx;
send_msg.msgs.vers_1_msgs.send_rndis_pkt.send_buf_section_size =
pkt->send_buf_section_size;
if (pkt->gpa_cnt) {
ret = vmbus_chan_send_sglist(chan, pkt->gpa, pkt->gpa_cnt,
&send_msg, sizeof(nvsp_msg), (uint64_t)(uintptr_t)pkt);
} else {
ret = vmbus_chan_send(chan,
VMBUS_CHANPKT_TYPE_INBAND, VMBUS_CHANPKT_FLAG_RC,
&send_msg, sizeof(nvsp_msg), (uint64_t)(uintptr_t)pkt);
}
return (ret);
}
/*
* Send NDIS version 2 config packet containing MTU.
*
* Not valid for NDIS version 1.
*/
static int
hv_nv_send_ndis_config(struct hn_softc *sc, uint32_t mtu)
{
netvsc_dev *net_dev;
nvsp_msg *init_pkt;
int ret;
net_dev = hv_nv_get_outbound_net_device(sc);
if (!net_dev)
return (-ENODEV);
/*
* Set up configuration packet, write MTU
* Indicate we are capable of handling VLAN tags
*/
init_pkt = &net_dev->channel_init_packet;
memset(init_pkt, 0, sizeof(nvsp_msg));
init_pkt->hdr.msg_type = nvsp_msg_2_type_send_ndis_config;
init_pkt->msgs.vers_2_msgs.send_ndis_config.mtu = mtu;
init_pkt->
msgs.vers_2_msgs.send_ndis_config.capabilities.u1.u2.ieee8021q
= 1;
/* Send the configuration packet */
ret = vmbus_chan_send(sc->hn_prichan, VMBUS_CHANPKT_TYPE_INBAND, 0,
init_pkt, sizeof(nvsp_msg), (uint64_t)(uintptr_t)init_pkt);
if (ret != 0)
return (-EINVAL);
return (0);
}
static void
vmbus_heartbeat_cb(struct vmbus_channel *chan, void *xsc)
{
struct hv_util_sc *sc = xsc;
struct vmbus_icmsg_hdr *hdr;
int dlen, error;
uint64_t xactid;
void *data;
/*
* Receive request.
*/
data = sc->receive_buffer;
dlen = sc->ic_buflen;
error = vmbus_chan_recv(chan, data, &dlen, &xactid);
KASSERT(error != ENOBUFS, ("icbuf is not large enough"));
if (error)
return;
if (dlen < sizeof(*hdr)) {
device_printf(sc->ic_dev, "invalid data len %d\n", dlen);
return;
}
hdr = data;
/*
* Update request, which will be echoed back as response.
*/
switch (hdr->ic_type) {
case VMBUS_ICMSG_TYPE_NEGOTIATE:
error = vmbus_ic_negomsg(sc, data, &dlen);
if (error)
return;
break;
case VMBUS_ICMSG_TYPE_HEARTBEAT:
/* Only ic_seq is a must */
if (dlen < VMBUS_ICMSG_HEARTBEAT_SIZE_MIN) {
device_printf(sc->ic_dev, "invalid heartbeat len %d\n",
dlen);
return;
}
((struct vmbus_icmsg_heartbeat *)data)->ic_seq++;
break;
default:
device_printf(sc->ic_dev, "got 0x%08x icmsg\n", hdr->ic_type);
break;
}
/*
* Send response by echoing the updated request back.
*/
hdr->ic_flags = VMBUS_ICMSG_FLAG_XACT | VMBUS_ICMSG_FLAG_RESP;
error = vmbus_chan_send(chan, VMBUS_CHANPKT_TYPE_INBAND, 0,
data, dlen, xactid);
if (error)
device_printf(sc->ic_dev, "resp send failed: %d\n", error);
}
/*
* Send the response back to the host.
*/
static void
hv_kvp_respond_host(hv_kvp_sc *sc, uint32_t error)
{
struct hv_vmbus_icmsg_hdr *hv_icmsg_hdrp;
hv_icmsg_hdrp = (struct hv_vmbus_icmsg_hdr *)
&sc->rcv_buf[sizeof(struct hv_vmbus_pipe_hdr)];
hv_icmsg_hdrp->status = error;
hv_icmsg_hdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION |
HV_ICMSGHDRFLAG_RESPONSE;
error = vmbus_chan_send(vmbus_get_channel(sc->dev),
VMBUS_CHANPKT_TYPE_INBAND, 0, sc->rcv_buf, sc->host_msg_len,
sc->host_msg_id);
if (error)
hv_kvp_log_info("%s: hv_kvp_respond_host: sendpacket error:%d\n",
__func__, error);
}
/**
* Time Sync Channel message handler
*/
static void
hv_timesync_cb(struct vmbus_channel *channel, void *context)
{
hv_vmbus_icmsg_hdr* icmsghdrp;
uint32_t recvlen;
uint64_t requestId;
int ret;
uint8_t* time_buf;
struct hv_ictimesync_data* timedatap;
hv_timesync_sc *softc;
softc = (hv_timesync_sc*)context;
time_buf = softc->util_sc.receive_buffer;
recvlen = PAGE_SIZE;
ret = vmbus_chan_recv(channel, time_buf, &recvlen, &requestId);
KASSERT(ret != ENOBUFS, ("hvtimesync recvbuf is not large enough"));
/* XXX check recvlen to make sure that it contains enough data */
if ((ret == 0) && recvlen > 0) {
icmsghdrp = (struct hv_vmbus_icmsg_hdr *) &time_buf[
sizeof(struct hv_vmbus_pipe_hdr)];
if (icmsghdrp->icmsgtype == HV_ICMSGTYPE_NEGOTIATE) {
hv_negotiate_version(icmsghdrp, NULL, time_buf);
} else {
timedatap = (struct hv_ictimesync_data *) &time_buf[
sizeof(struct hv_vmbus_pipe_hdr) +
sizeof(struct hv_vmbus_icmsg_hdr)];
hv_adj_guesttime(softc, timedatap->parenttime, timedatap->flags);
}
icmsghdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION
| HV_ICMSGHDRFLAG_RESPONSE;
vmbus_chan_send(channel, VMBUS_CHANPKT_TYPE_INBAND, 0,
time_buf, recvlen, requestId);
}
}
/*
* Net VSC connect to VSP
*/
static int
hv_nv_connect_to_vsp(struct hn_softc *sc)
{
netvsc_dev *net_dev;
nvsp_msg *init_pkt;
uint32_t ndis_version;
uint32_t protocol_list[] = { NVSP_PROTOCOL_VERSION_1,
NVSP_PROTOCOL_VERSION_2,
NVSP_PROTOCOL_VERSION_4,
NVSP_PROTOCOL_VERSION_5 };
int i;
int protocol_number = nitems(protocol_list);
int ret = 0;
device_t dev = sc->hn_dev;
struct ifnet *ifp = sc->hn_ifp;
net_dev = hv_nv_get_outbound_net_device(sc);
/*
* Negotiate the NVSP version. Try the latest NVSP first.
*/
for (i = protocol_number - 1; i >= 0; i--) {
if (hv_nv_negotiate_nvsp_protocol(sc, net_dev,
protocol_list[i]) == 0) {
net_dev->nvsp_version = protocol_list[i];
if (bootverbose)
device_printf(dev, "Netvsc: got version 0x%x\n",
net_dev->nvsp_version);
break;
}
}
if (i < 0) {
if (bootverbose)
device_printf(dev, "failed to negotiate a valid "
"protocol.\n");
return (EPROTO);
}
/*
* Set the MTU if supported by this NVSP protocol version
* This needs to be right after the NVSP init message per Haiyang
*/
if (net_dev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
ret = hv_nv_send_ndis_config(sc, ifp->if_mtu);
/*
* Send the NDIS version
*/
init_pkt = &net_dev->channel_init_packet;
memset(init_pkt, 0, sizeof(nvsp_msg));
if (net_dev->nvsp_version <= NVSP_PROTOCOL_VERSION_4) {
ndis_version = NDIS_VERSION_6_1;
} else {
ndis_version = NDIS_VERSION_6_30;
}
init_pkt->hdr.msg_type = nvsp_msg_1_type_send_ndis_vers;
init_pkt->msgs.vers_1_msgs.send_ndis_vers.ndis_major_vers =
(ndis_version & 0xFFFF0000) >> 16;
init_pkt->msgs.vers_1_msgs.send_ndis_vers.ndis_minor_vers =
ndis_version & 0xFFFF;
/* Send the init request */
ret = vmbus_chan_send(sc->hn_prichan, VMBUS_CHANPKT_TYPE_INBAND, 0,
init_pkt, sizeof(nvsp_msg), (uint64_t)(uintptr_t)init_pkt);
if (ret != 0) {
goto cleanup;
}
/*
* TODO: BUGBUG - We have to wait for the above msg since the netvsp
* uses KMCL which acknowledges packet (completion packet)
* since our Vmbus always set the VMBUS_CHANPKT_FLAG_RC flag
*/
/* sema_wait(&NetVscChannel->channel_init_sema); */
/* Post the big receive buffer to NetVSP */
if (net_dev->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
net_dev->rx_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
else
net_dev->rx_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
net_dev->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
ret = hv_nv_init_rx_buffer_with_net_vsp(sc);
if (ret == 0)
ret = hv_nv_init_send_buffer_with_net_vsp(sc);
cleanup:
return (ret);
}
/*
* Net VSC destroy send buffer
*/
static int
hv_nv_destroy_send_buffer(netvsc_dev *net_dev)
{
nvsp_msg *revoke_pkt;
int ret = 0;
/*
* If we got a section count, it means we received a
* send_rx_buf_complete msg
* (ie sent nvsp_msg_1_type_send_rx_buf msg) therefore,
* we need to send a revoke msg here
*/
if (net_dev->send_section_size) {
/* Send the revoke send buffer */
revoke_pkt = &net_dev->revoke_packet;
memset(revoke_pkt, 0, sizeof(nvsp_msg));
revoke_pkt->hdr.msg_type =
nvsp_msg_1_type_revoke_send_buf;
revoke_pkt->msgs.vers_1_msgs.revoke_send_buf.id =
NETVSC_SEND_BUFFER_ID;
ret = vmbus_chan_send(net_dev->sc->hn_prichan,
VMBUS_CHANPKT_TYPE_INBAND, 0,
revoke_pkt, sizeof(nvsp_msg),
(uint64_t)(uintptr_t)revoke_pkt);
/*
* If we failed here, we might as well return and have a leak
* rather than continue and a bugchk
*/
if (ret != 0) {
return (ret);
}
}
/* Tear down the gpadl on the vsp end */
if (net_dev->send_buf_gpadl_handle) {
ret = vmbus_chan_gpadl_disconnect(net_dev->sc->hn_prichan,
net_dev->send_buf_gpadl_handle);
/*
* If we failed here, we might as well return and have a leak
* rather than continue and a bugchk
*/
if (ret != 0) {
return (ret);
}
net_dev->send_buf_gpadl_handle = 0;
}
if (net_dev->send_buf) {
/* Free up the receive buffer */
hyperv_dmamem_free(&net_dev->txbuf_dma, net_dev->send_buf);
net_dev->send_buf = NULL;
}
if (net_dev->send_section_bitsmap) {
free(net_dev->send_section_bitsmap, M_NETVSC);
}
return (ret);
}
/*
* Net VSC initialize send buffer with net VSP
*/
static int
hv_nv_init_send_buffer_with_net_vsp(struct hn_softc *sc)
{
netvsc_dev *net_dev;
nvsp_msg *init_pkt;
int ret = 0;
net_dev = hv_nv_get_outbound_net_device(sc);
if (!net_dev) {
return (ENODEV);
}
net_dev->send_buf = hyperv_dmamem_alloc(bus_get_dma_tag(sc->hn_dev),
PAGE_SIZE, 0, net_dev->send_buf_size, &net_dev->txbuf_dma,
BUS_DMA_WAITOK | BUS_DMA_ZERO);
if (net_dev->send_buf == NULL) {
device_printf(sc->hn_dev, "allocate chimney txbuf failed\n");
return ENOMEM;
}
/*
* Connect chimney sending buffer GPADL to the primary channel.
*
* NOTE:
* Only primary channel has chimney sending buffer connected to it.
* Sub-channels just share this chimney sending buffer.
*/
ret = vmbus_chan_gpadl_connect(sc->hn_prichan,
net_dev->txbuf_dma.hv_paddr, net_dev->send_buf_size,
&net_dev->send_buf_gpadl_handle);
if (ret != 0) {
device_printf(sc->hn_dev, "chimney sending buffer gpadl "
"connect failed: %d\n", ret);
goto cleanup;
}
/* Notify the NetVsp of the gpadl handle */
init_pkt = &net_dev->channel_init_packet;
memset(init_pkt, 0, sizeof(nvsp_msg));
init_pkt->hdr.msg_type = nvsp_msg_1_type_send_send_buf;
init_pkt->msgs.vers_1_msgs.send_rx_buf.gpadl_handle =
net_dev->send_buf_gpadl_handle;
init_pkt->msgs.vers_1_msgs.send_rx_buf.id =
NETVSC_SEND_BUFFER_ID;
/* Send the gpadl notification request */
ret = vmbus_chan_send(sc->hn_prichan,
VMBUS_CHANPKT_TYPE_INBAND, VMBUS_CHANPKT_FLAG_RC,
init_pkt, sizeof(nvsp_msg), (uint64_t)init_pkt);
if (ret != 0) {
goto cleanup;
}
sema_wait(&net_dev->channel_init_sema);
/* Check the response */
if (init_pkt->msgs.vers_1_msgs.send_send_buf_complete.status
!= nvsp_status_success) {
ret = EINVAL;
goto cleanup;
}
net_dev->send_section_size =
init_pkt->msgs.vers_1_msgs.send_send_buf_complete.section_size;
net_dev->send_section_count =
net_dev->send_buf_size / net_dev->send_section_size;
net_dev->bitsmap_words = howmany(net_dev->send_section_count,
BITS_PER_LONG);
net_dev->send_section_bitsmap =
malloc(net_dev->bitsmap_words * sizeof(long), M_NETVSC,
M_WAITOK | M_ZERO);
goto exit;
cleanup:
hv_nv_destroy_send_buffer(net_dev);
exit:
return (ret);
}
/*
* Net VSC initialize receive buffer with net VSP
*
* Net VSP: Network virtual services client, also known as the
* Hyper-V extensible switch and the synthetic data path.
*/
static int
hv_nv_init_rx_buffer_with_net_vsp(struct hn_softc *sc)
{
netvsc_dev *net_dev;
nvsp_msg *init_pkt;
int ret = 0;
net_dev = hv_nv_get_outbound_net_device(sc);
if (!net_dev) {
return (ENODEV);
}
net_dev->rx_buf = hyperv_dmamem_alloc(bus_get_dma_tag(sc->hn_dev),
PAGE_SIZE, 0, net_dev->rx_buf_size, &net_dev->rxbuf_dma,
BUS_DMA_WAITOK | BUS_DMA_ZERO);
if (net_dev->rx_buf == NULL) {
device_printf(sc->hn_dev, "allocate rxbuf failed\n");
return ENOMEM;
}
/*
* Connect the RXBUF GPADL to the primary channel.
*
* NOTE:
* Only primary channel has RXBUF connected to it. Sub-channels
* just share this RXBUF.
*/
ret = vmbus_chan_gpadl_connect(sc->hn_prichan,
net_dev->rxbuf_dma.hv_paddr, net_dev->rx_buf_size,
&net_dev->rx_buf_gpadl_handle);
if (ret != 0) {
device_printf(sc->hn_dev, "rxbuf gpadl connect failed: %d\n",
ret);
goto cleanup;
}
/* sema_wait(&ext->channel_init_sema); KYS CHECK */
/* Notify the NetVsp of the gpadl handle */
init_pkt = &net_dev->channel_init_packet;
memset(init_pkt, 0, sizeof(nvsp_msg));
init_pkt->hdr.msg_type = nvsp_msg_1_type_send_rx_buf;
init_pkt->msgs.vers_1_msgs.send_rx_buf.gpadl_handle =
net_dev->rx_buf_gpadl_handle;
init_pkt->msgs.vers_1_msgs.send_rx_buf.id =
NETVSC_RECEIVE_BUFFER_ID;
/* Send the gpadl notification request */
ret = vmbus_chan_send(sc->hn_prichan,
VMBUS_CHANPKT_TYPE_INBAND, VMBUS_CHANPKT_FLAG_RC,
init_pkt, sizeof(nvsp_msg), (uint64_t)(uintptr_t)init_pkt);
if (ret != 0) {
goto cleanup;
}
sema_wait(&net_dev->channel_init_sema);
/* Check the response */
if (init_pkt->msgs.vers_1_msgs.send_rx_buf_complete.status
!= nvsp_status_success) {
ret = EINVAL;
goto cleanup;
}
net_dev->rx_section_count =
init_pkt->msgs.vers_1_msgs.send_rx_buf_complete.num_sections;
net_dev->rx_sections = malloc(net_dev->rx_section_count *
sizeof(nvsp_1_rx_buf_section), M_NETVSC, M_WAITOK);
memcpy(net_dev->rx_sections,
init_pkt->msgs.vers_1_msgs.send_rx_buf_complete.sections,
net_dev->rx_section_count * sizeof(nvsp_1_rx_buf_section));
/*
* For first release, there should only be 1 section that represents
* the entire receive buffer
*/
if (net_dev->rx_section_count != 1
|| net_dev->rx_sections->offset != 0) {
ret = EINVAL;
goto cleanup;
}
goto exit;
cleanup:
hv_nv_destroy_rx_buffer(net_dev);
exit:
return (ret);
}
/**
* Shutdown
*/
static void
hv_shutdown_cb(struct vmbus_channel *channel, void *context)
{
uint8_t* buf;
uint8_t execute_shutdown = 0;
hv_vmbus_icmsg_hdr* icmsghdrp;
uint32_t recv_len;
uint64_t request_id;
int ret;
hv_vmbus_shutdown_msg_data* shutdown_msg;
hv_util_sc *softc;
softc = (hv_util_sc*)context;
buf = softc->receive_buffer;
recv_len = softc->ic_buflen;
ret = vmbus_chan_recv(channel, buf, &recv_len, &request_id);
KASSERT(ret != ENOBUFS, ("hvshutdown recvbuf is not large enough"));
/* XXX check recv_len to make sure that it contains enough data */
if ((ret == 0) && recv_len > 0) {
icmsghdrp = (struct hv_vmbus_icmsg_hdr *)
&buf[sizeof(struct hv_vmbus_pipe_hdr)];
if (icmsghdrp->icmsgtype == HV_ICMSGTYPE_NEGOTIATE) {
hv_negotiate_version(icmsghdrp, buf);
} else {
shutdown_msg =
(struct hv_vmbus_shutdown_msg_data *)
&buf[sizeof(struct hv_vmbus_pipe_hdr) +
sizeof(struct hv_vmbus_icmsg_hdr)];
switch (shutdown_msg->flags) {
case 0:
case 1:
icmsghdrp->status = HV_S_OK;
execute_shutdown = 1;
if(bootverbose)
printf("Shutdown request received -"
" graceful shutdown initiated\n");
break;
default:
icmsghdrp->status = HV_E_FAIL;
execute_shutdown = 0;
printf("Shutdown request received -"
" Invalid request\n");
break;
}
}
icmsghdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION |
HV_ICMSGHDRFLAG_RESPONSE;
vmbus_chan_send(channel, VMBUS_CHANPKT_TYPE_INBAND, 0,
buf, recv_len, request_id);
}
if (execute_shutdown)
shutdown_nice(RB_POWEROFF);
}
static void
vmbus_timesync_cb(struct vmbus_channel *chan, void *xsc)
{
struct hv_util_sc *sc = xsc;
struct vmbus_icmsg_hdr *hdr;
const struct vmbus_icmsg_timesync *msg;
int dlen, error;
uint64_t xactid;
void *data;
/*
* Receive request.
*/
data = sc->receive_buffer;
dlen = sc->ic_buflen;
error = vmbus_chan_recv(chan, data, &dlen, &xactid);
KASSERT(error != ENOBUFS, ("icbuf is not large enough"));
if (error)
return;
if (dlen < sizeof(*hdr)) {
device_printf(sc->ic_dev, "invalid data len %d\n", dlen);
return;
}
hdr = data;
/*
* Update request, which will be echoed back as response.
*/
switch (hdr->ic_type) {
case VMBUS_ICMSG_TYPE_NEGOTIATE:
error = vmbus_ic_negomsg(sc, data, &dlen,
VMBUS_TIMESYNC_FWVER, VMBUS_TIMESYNC_MSGVER);
if (error)
return;
break;
case VMBUS_ICMSG_TYPE_TIMESYNC:
if (dlen < sizeof(*msg)) {
device_printf(sc->ic_dev, "invalid timesync len %d\n",
dlen);
return;
}
msg = data;
vmbus_timesync(sc, msg->ic_hvtime, msg->ic_tsflags);
break;
default:
device_printf(sc->ic_dev, "got 0x%08x icmsg\n", hdr->ic_type);
break;
}
/*
* Send response by echoing the updated request back.
*/
hdr->ic_flags = VMBUS_ICMSG_FLAG_XACT | VMBUS_ICMSG_FLAG_RESP;
error = vmbus_chan_send(chan, VMBUS_CHANPKT_TYPE_INBAND, 0,
data, dlen, xactid);
if (error)
device_printf(sc->ic_dev, "resp send failed: %d\n", error);
}
