Kent Hagerman | 3136fbd | 2020-05-14 10:30:45 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2018-present Open Networking Foundation |
| 3 | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package device |
| 18 | |
| 19 | import ( |
| 20 | "context" |
| 21 | "fmt" |
| 22 | "sync" |
| 23 | |
| 24 | "github.com/gogo/protobuf/proto" |
| 25 | fu "github.com/opencord/voltha-lib-go/v3/pkg/flows" |
| 26 | "github.com/opencord/voltha-lib-go/v3/pkg/log" |
| 27 | ofp "github.com/opencord/voltha-protos/v3/go/openflow_13" |
| 28 | "github.com/opencord/voltha-protos/v3/go/voltha" |
| 29 | ) |
| 30 | |
| 31 | //MeterChunk keeps a meter entry and its lock. The lock in the struct is used to syncronize the |
| 32 | //modifications for the related meter. |
| 33 | type MeterChunk struct { |
| 34 | meter *ofp.OfpMeterEntry |
| 35 | lock sync.Mutex |
| 36 | } |
| 37 | |
| 38 | func (agent *LogicalAgent) loadMeters(ctx context.Context) { |
| 39 | agent.meterLock.Lock() |
| 40 | defer agent.meterLock.Unlock() |
| 41 | |
| 42 | var meters []*ofp.OfpMeterEntry |
| 43 | if err := agent.clusterDataProxy.List(ctx, "meters/"+agent.logicalDeviceID, &meters); err != nil { |
| 44 | logger.Errorw("Failed-to-list-meters-from-proxy", log.Fields{"error": err}) |
| 45 | return |
| 46 | } |
| 47 | for _, meter := range meters { |
| 48 | if meter.Config != nil { |
| 49 | meterChunk := MeterChunk{ |
| 50 | meter: meter, |
| 51 | } |
| 52 | agent.meters[meter.Config.MeterId] = &meterChunk |
| 53 | } |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | //updateLogicalDeviceMeter updates meter info in store and cache |
| 58 | //It is assumed that the chunk lock has been acquired before this function is called |
| 59 | func (agent *LogicalAgent) updateLogicalDeviceMeter(ctx context.Context, meter *ofp.OfpMeterEntry, meterChunk *MeterChunk) error { |
| 60 | path := fmt.Sprintf("meters/%s/%d", agent.logicalDeviceID, meter.Config.MeterId) |
| 61 | if err := agent.clusterDataProxy.Update(ctx, path, meter); err != nil { |
| 62 | logger.Errorw("error-updating-logical-device-with-meters", log.Fields{"error": err}) |
| 63 | return err |
| 64 | } |
| 65 | meterChunk.meter = meter |
| 66 | return nil |
| 67 | } |
| 68 | |
| 69 | //removeLogicalDeviceMeter deletes the meter from store and cache |
| 70 | //It is assumed that the chunk lock has been acquired before this function is called |
| 71 | func (agent *LogicalAgent) removeLogicalDeviceMeter(ctx context.Context, meterID uint32) error { |
| 72 | path := fmt.Sprintf("meters/%s/%d", agent.logicalDeviceID, meterID) |
| 73 | if err := agent.clusterDataProxy.Remove(ctx, path); err != nil { |
| 74 | return fmt.Errorf("couldnt-delete-meter-from-store-%s", path) |
| 75 | } |
| 76 | agent.meterLock.Lock() |
| 77 | defer agent.meterLock.Unlock() |
| 78 | delete(agent.meters, meterID) |
| 79 | return nil |
| 80 | } |
| 81 | |
| 82 | // ListLogicalDeviceMeters returns logical device meters |
| 83 | func (agent *LogicalAgent) ListLogicalDeviceMeters(ctx context.Context) (*ofp.Meters, error) { |
| 84 | logger.Debug("ListLogicalDeviceMeters") |
| 85 | |
| 86 | var meterEntries []*ofp.OfpMeterEntry |
| 87 | agent.meterLock.RLock() |
| 88 | defer agent.meterLock.RUnlock() |
| 89 | for _, meterChunk := range agent.meters { |
| 90 | meterEntries = append(meterEntries, (proto.Clone(meterChunk.meter)).(*ofp.OfpMeterEntry)) |
| 91 | } |
| 92 | return &ofp.Meters{Items: meterEntries}, nil |
| 93 | } |
| 94 | |
| 95 | // GetMeterConfig returns meter config |
| 96 | func (agent *LogicalAgent) GetMeterConfig(flows []*ofp.OfpFlowStats, meters []*ofp.OfpMeterEntry, metadata *voltha.FlowMetadata) error { |
| 97 | m := make(map[uint32]bool) |
| 98 | for _, flow := range flows { |
| 99 | if flowMeterID := fu.GetMeterIdFromFlow(flow); flowMeterID != 0 && !m[flowMeterID] { |
| 100 | foundMeter := false |
| 101 | // Meter is present in the flow , Get from logical device |
| 102 | for _, meter := range meters { |
| 103 | if flowMeterID == meter.Config.MeterId { |
| 104 | metadata.Meters = append(metadata.Meters, meter.Config) |
| 105 | logger.Debugw("Found meter in logical device", |
| 106 | log.Fields{"meterID": flowMeterID, "meter-band": meter.Config}) |
| 107 | m[flowMeterID] = true |
| 108 | foundMeter = true |
| 109 | break |
| 110 | } |
| 111 | } |
| 112 | if !foundMeter { |
| 113 | logger.Errorw("Meter-referred-by-flow-is-not-found-in-logicaldevice", |
| 114 | log.Fields{"meterID": flowMeterID, "Available-meters": meters, "flow": *flow}) |
| 115 | return fmt.Errorf("Meter-referred-by-flow-is-not-found-in-logicaldevice.MeterId-%d", flowMeterID) |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 | logger.Debugw("meter-bands-for-flows", log.Fields{"flows": len(flows), "metadata": metadata}) |
| 120 | return nil |
| 121 | } |
| 122 | |
| 123 | func (agent *LogicalAgent) updateFlowCountOfMeterStats(ctx context.Context, modCommand *ofp.OfpFlowMod, flow *ofp.OfpFlowStats, revertUpdate bool) bool { |
| 124 | flowCommand := modCommand.GetCommand() |
| 125 | meterID := fu.GetMeterIdFromFlow(flow) |
| 126 | logger.Debugw("Meter-id-in-flow-mod", log.Fields{"meterId": meterID}) |
| 127 | if meterID == 0 { |
| 128 | logger.Debugw("No-meter-present-in-the-flow", log.Fields{"flow": *flow}) |
| 129 | return true |
| 130 | } |
| 131 | |
| 132 | if flowCommand != ofp.OfpFlowModCommand_OFPFC_ADD && flowCommand != ofp.OfpFlowModCommand_OFPFC_DELETE_STRICT { |
| 133 | return true |
| 134 | } |
| 135 | agent.meterLock.RLock() |
| 136 | meterChunk, ok := agent.meters[meterID] |
| 137 | agent.meterLock.RUnlock() |
| 138 | if !ok { |
| 139 | logger.Debugw("Meter-is-not-present-in-logical-device", log.Fields{"meterID": meterID}) |
| 140 | return true |
| 141 | } |
| 142 | |
| 143 | //acquire the meter lock |
| 144 | meterChunk.lock.Lock() |
| 145 | defer meterChunk.lock.Unlock() |
| 146 | |
| 147 | if flowCommand == ofp.OfpFlowModCommand_OFPFC_ADD { |
| 148 | if revertUpdate { |
| 149 | meterChunk.meter.Stats.FlowCount-- |
| 150 | } else { |
| 151 | meterChunk.meter.Stats.FlowCount++ |
| 152 | } |
| 153 | } else if flowCommand == ofp.OfpFlowModCommand_OFPFC_DELETE_STRICT { |
| 154 | if revertUpdate { |
| 155 | meterChunk.meter.Stats.FlowCount++ |
| 156 | } else { |
| 157 | meterChunk.meter.Stats.FlowCount-- |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | // Update store and cache |
| 162 | if err := agent.updateLogicalDeviceMeter(ctx, meterChunk.meter, meterChunk); err != nil { |
| 163 | logger.Debugw("unable-to-update-meter-in-db", log.Fields{"logicalDevice": agent.logicalDeviceID, "meterID": meterID}) |
| 164 | return false |
| 165 | } |
| 166 | |
| 167 | logger.Debugw("updated-meter-flow-stats", log.Fields{"meterId": meterID}) |
| 168 | return true |
| 169 | } |