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This is a virtcontainers 1.0.8 import into Kata Containers runtime. virtcontainers is a Go library designed to manage hardware virtualized pods and containers. It is the core Clear Containers framework and will become the core Kata Containers framework, as discussed at https://github.com/kata-containers/runtime/issues/33 Some more more pointers: virtcontainers README, including some design and architecure notes: https://github.com/containers/virtcontainers/blob/master/README.md virtcontainers 1.0 API: https://github.com/containers/virtcontainers/blob/master/documentation/api/1.0/api.md Fixes #40 Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
//
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// Copyright (c) 2017 Intel Corporation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package virtcontainers
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import "fmt"
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type bridgeType string
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const (
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pciBridge bridgeType = "pci"
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pcieBridge = "pcie"
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)
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const pciBridgeMaxCapacity = 30
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// Bridge is a bridge where devices can be hot plugged
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type Bridge struct {
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// Address contains information about devices plugged and its address in the bridge
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Address map[uint32]string
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// Type is the type of the bridge (pci, pcie, etc)
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Type bridgeType
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//ID is used to identify the bridge in the hypervisor
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ID string
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}
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// addDevice on success adds the device ID to the bridge and return the address
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// where the device was added, otherwise an error is returned
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func (b *Bridge) addDevice(ID string) (uint32, error) {
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var addr uint32
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// looking for the first available address
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for i := uint32(1); i <= pciBridgeMaxCapacity; i++ {
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if _, ok := b.Address[i]; !ok {
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addr = i
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break
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}
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}
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if addr == 0 {
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return 0, fmt.Errorf("Unable to hot plug device on bridge: there are not empty slots")
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}
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// save address and device
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b.Address[addr] = ID
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return addr, nil
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}
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// removeDevice on success removes the device ID from the bridge and return nil,
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// otherwise an error is returned
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func (b *Bridge) removeDevice(ID string) error {
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// check if the device was hot plugged in the bridge
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for addr, devID := range b.Address {
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if devID == ID {
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// free address to re-use the same slot with other devices
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delete(b.Address, addr)
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return nil
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}
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}
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return fmt.Errorf("Unable to hot unplug device %s: not present on bridge", ID)
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}
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