examples/vm_power: send confirmation cmd to guest

Use new guest channel API to send confirmation
message for received power command.

Signed-off-by: Marcin Hajkowski <marcinx.hajkowski@intel.com>
Tested-by: David Hunt <david.hunt@intel.com>
Acked-by: Lee Daly <lee.daly@intel.com>

diff --git a/examples/vm_power_manager/channel_monitor.c b/examples/vm_power_manager/channel_monitor.c
index fe6088a..0c73fac 100644 (file)
--- a/examples/vm_power_manager/channel_monitor.c
+++ b/examples/vm_power_manager/channel_monitor.c
@@ -671,6 +671,41 @@ apply_policy(struct policy *pol)
                apply_workload_profile(pol);
 }
 
+static int
+write_binary_packet(struct channel_packet *pkt, struct channel_info *chan_info)
+{
+       int ret, buffer_len = sizeof(*pkt);
+       void *buffer = pkt;
+
+       if (chan_info->fd < 0) {
+               RTE_LOG(ERR, CHANNEL_MONITOR, "Channel is not connected\n");
+               return -1;
+       }
+
+       while (buffer_len > 0) {
+               ret = write(chan_info->fd, buffer, buffer_len);
+               if (ret == -1) {
+                       if (errno == EINTR)
+                               continue;
+                       RTE_LOG(ERR, CHANNEL_MONITOR, "Write function failed due to %s.\n",
+                                       strerror(errno));
+                       return -1;
+               }
+               buffer = (char *)buffer + ret;
+               buffer_len -= ret;
+       }
+       return 0;
+}
+
+static int
+send_ack_for_received_cmd(struct channel_packet *pkt,
+               struct channel_info *chan_info,
+               uint32_t command)
+{
+       pkt->command = command;
+       return write_binary_packet(pkt, chan_info);
+}
+
 static int
 process_request(struct channel_packet *pkt, struct channel_info *chan_info)
 {
@@ -694,33 +729,54 @@ process_request(struct channel_packet *pkt, struct channel_info *chan_info)
                RTE_LOG(DEBUG, CHANNEL_MONITOR, "Processing requested cmd for cpu:%d\n",
                        core_num);
 
+               bool valid_unit = true;
+               int scale_res;
+
                switch (pkt->unit) {
                case(CPU_POWER_SCALE_MIN):
-                       power_manager_scale_core_min(core_num);
+                       scale_res = power_manager_scale_core_min(core_num);
                        break;
                case(CPU_POWER_SCALE_MAX):
-                       power_manager_scale_core_max(core_num);
+                       scale_res = power_manager_scale_core_max(core_num);
                        break;
                case(CPU_POWER_SCALE_DOWN):
-                       power_manager_scale_core_down(core_num);
+                       scale_res = power_manager_scale_core_down(core_num);
                        break;
                case(CPU_POWER_SCALE_UP):
-                       power_manager_scale_core_up(core_num);
+                       scale_res = power_manager_scale_core_up(core_num);
                        break;
                case(CPU_POWER_ENABLE_TURBO):
-                       power_manager_enable_turbo_core(core_num);
+                       scale_res = power_manager_enable_turbo_core(core_num);
                        break;
                case(CPU_POWER_DISABLE_TURBO):
-                       power_manager_disable_turbo_core(core_num);
+                       scale_res = power_manager_disable_turbo_core(core_num);
                        break;
                default:
+                       valid_unit = false;
                        break;
                }
+
+               if (valid_unit) {
+                       ret = send_ack_for_received_cmd(pkt,
+                                       chan_info,
+                                       scale_res > 0 ?
+                                               CPU_POWER_CMD_ACK :
+                                               CPU_POWER_CMD_NACK);
+                       if (ret < 0)
+                               RTE_LOG(DEBUG, CHANNEL_MONITOR, "Error during sending ack command.\n");
+               } else
+                       RTE_LOG(DEBUG, CHANNEL_MONITOR, "Unexpected unit type.\n");
+
        }
 
        if (pkt->command == PKT_POLICY) {
                RTE_LOG(INFO, CHANNEL_MONITOR, "Processing policy request %s\n",
                                pkt->vm_name);
+               int ret = send_ack_for_received_cmd(pkt,
+                               chan_info,
+                               CPU_POWER_CMD_ACK);
+               if (ret < 0)
+                       RTE_LOG(DEBUG, CHANNEL_MONITOR, "Error during sending ack command.\n");
                update_policy(pkt);
                policy_is_set = 1;
        }