static int
vmci_transport_notify_pkt_send_post_enqueue(
struct sock *sk,
ssize_t written,
struct vmci_transport_send_notify_data *data)
{
int err = 0;
struct vsock_sock *vsk;
bool sent_wrote = false;
bool was_empty;
int retries = 0;
vsk = vsock_sk(sk);
smp_mb();
was_empty =
vmci_qpair_produce_buf_ready(vmci_trans(vsk)->qpair) == written;
if (was_empty) {
while (!(vsk->peer_shutdown & RCV_SHUTDOWN) &&
!sent_wrote &&
retries < VMCI_TRANSPORT_MAX_DGRAM_RESENDS) {
err = vmci_transport_send_wrote(sk);
if (err >= 0)
sent_wrote = true;
retries++;
}
}
if (retries >= VMCI_TRANSPORT_MAX_DGRAM_RESENDS && !sent_wrote) {
pr_err("%p unable to send wrote notification to peer\n",
sk);
return err;
}
return err;
}
static int
VPageChannelSendPacket(VPageChannel *channel, // IN
VPageChannelPacket *packet, // IN
Bool needsLock, // IN
Bool signalPending) // IN
{
int retval;
ssize_t totalSize, sentSize;
ssize_t freeSpace;
unsigned long flags;
ASSERT(channel);
if (VPCState_Connected != channel->state) {
VMCI_WARNING((LGPFX"Not connected (channel=%p).\n",
channel));
return VMCI_ERROR_DST_UNREACHABLE;
}
ASSERT(packet);
totalSize = sizeof(VPageChannelPacket) + packet->msgLen +
packet->numElems * sizeof(VPageChannelElem);
if (needsLock) {
VPageChannelAcquireSendLock(channel, &flags);
} else {
flags = 0; /* Silence compiler. */
}
freeSpace = vmci_qpair_produce_free_space(channel->qpair);
if (freeSpace < totalSize) {
VMCI_WARNING((LGPFX"No free space in queuepair (channel=%p) "
"(required=%"FMTSZ"d) (actual=%"FMTSZ"d).\n",
channel,
totalSize,
freeSpace));
retval = VMCI_ERROR_NO_MEM;
goto exit;
}
sentSize = vmci_qpair_enqueue(channel->qpair, packet, totalSize, 0);
if (!signalPending) {
if (sentSize == vmci_qpair_produce_buf_ready(channel->qpair)) {
retval = VPageChannelSignal(channel);
if (retval < VMCI_SUCCESS) {
goto exit;
}
}
}
if (sentSize < totalSize) {
/*
* XXX, deal with partial sending.
*/
VMCI_WARNING((LGPFX"No free space in queuepair (channel=%p) "
"(required=%"FMTSZ"d) (actual=%"FMTSZ"d).\n",
channel,
totalSize,
sentSize));
retval = VMCI_ERROR_NO_MEM;
goto exit;
}
VMCI_DEBUG_LOG(10,
(LGPFX"Sent packet (channel=%p) (size=%"FMTSZ"d).\n",
channel,
sentSize));
retval = VMCI_SUCCESS;
exit:
if (needsLock) {
VPageChannelReleaseSendLock(channel, flags);
}
return retval;
}
