New upstream version 18.11-rc1

[deb_dpdk.git] / drivers / bus / vmbus / vmbus_channel.c

diff --git a/drivers/bus/vmbus/vmbus_channel.c b/drivers/bus/vmbus/vmbus_channel.c
index cc5f3e8..bd14c06 100644 (file)
--- a/drivers/bus/vmbus/vmbus_channel.c
+++ b/drivers/bus/vmbus/vmbus_channel.c
@@ -59,6 +59,32 @@ vmbus_set_event(const struct rte_vmbus_device *dev,
        vmbus_set_monitor(dev, chan->monitor_id);
 }
 
+/*
+ * Set the wait between when hypervisor examines the trigger.
+ */
+void
+rte_vmbus_set_latency(const struct rte_vmbus_device *dev,
+                     const struct vmbus_channel *chan,
+                     uint32_t latency)
+{
+       uint32_t trig_idx = chan->monitor_id / VMBUS_MONTRIG_LEN;
+       uint32_t trig_offs = chan->monitor_id % VMBUS_MONTRIG_LEN;
+
+       if (latency >= UINT16_MAX * 100) {
+               VMBUS_LOG(ERR, "invalid latency value %u", latency);
+               return;
+       }
+
+       if (trig_idx >= VMBUS_MONTRIGS_MAX) {
+               VMBUS_LOG(ERR, "invalid monitor trigger %u",
+                         trig_idx);
+               return;
+       }
+
+       /* Host value is expressed in 100 nanosecond units */
+       dev->monitor_page->lat[trig_idx][trig_offs] = latency / 100;
+}
+
 /*
  * Notify host that there are data pending on our TX bufring.
  *