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package ip
import (
"fmt"
"os"
"path/filepath"
"strings"
"github.com/vishvananda/netlink"
)
// MAX_VQP is the maximum number of VQPs supported by the vDPA device and is always the same as of now.
const (
vDPAMaxVQP = uint16(16)
)
// vDPA device classes.
const (
vdpaBusDevDir = "/sys/bus/vdpa/devices"
vdpaVhostDevDir = "/dev"
)
// VhostVDPA is the vhost-vdpa device information.
type VhostVDPA struct {
Name string
Path string
}
// VDPADev represents the vDPA device information.
type VDPADev struct {
// Name of the vDPA created device. e.g. "vdpa0" (note: the iproute2 associated command would look like `vdpa dev add mgmtdev pci/<PCI_SLOT_NAME> name vdpa0 max_vqp <MAX_VQP>`).
Name string
// Max VQs supported by the vDPA device.
MaxVQs uint32
// Associated vhost-vdpa device.
VhostVDPA *VhostVDPA
}
// getVhostVDPADevInPath returns the VhostVDPA found in the provided parent device's path.
func getVhostVDPADevInPath(parentPath string) (*VhostVDPA, error) {
fd, err := os.Open(parentPath)
if err != nil {
return nil, fmt.Errorf("Can not open %s: %v", parentPath, err)
}
defer func() {
_ = fd.Close()
}()
entries, err := fd.ReadDir(-1)
if err != nil {
return nil, fmt.Errorf("Can not get DirEntries: %v", err)
}
for _, file := range entries {
if strings.Contains(file.Name(), "vhost-vdpa") && file.IsDir() {
devicePath := filepath.Join(vdpaVhostDevDir, file.Name())
info, err := os.Stat(devicePath)
if err != nil {
return nil, fmt.Errorf("Vhost device %s is not a valid device", devicePath)
}
if info.Mode()&os.ModeDevice == 0 {
return nil, fmt.Errorf("Vhost device %s is not a valid device", devicePath)
}
return &VhostVDPA{
Name: file.Name(),
Path: devicePath,
}, nil
}
}
return nil, fmt.Errorf("No vhost-vdpa device found in %s", parentPath)
}
// AddVDPADevice adds a new vDPA device.
func AddVDPADevice(pciDevSlotName string, volatile map[string]string) (*VDPADev, error) {
existingDevices, err := netlink.VDPAGetDevList()
if err != nil {
return nil, fmt.Errorf("Failed to get vdpa dev list: %w", err)
}
existingVDPADevNames := make(map[string]struct{})
for _, device := range existingDevices {
existingVDPADevNames[device.Name] = struct{}{}
}
// Generate a unique attribute name for the vDPA device (i.e, vdpa0, vdpa1, etc.)
baseVDPAName, idx, generatedVDPADevName := "vdpa", 0, ""
for {
generatedVDPADevName = fmt.Sprintf("%s%d", baseVDPAName, idx)
_, ok := existingVDPADevNames[generatedVDPADevName]
if !ok {
break
}
idx++
}
err = netlink.VDPANewDev(generatedVDPADevName, "pci", pciDevSlotName, netlink.VDPANewDevParams{
MaxVQP: vDPAMaxVQP,
})
if err != nil {
return nil, err
}
dev, err := netlink.VDPAGetDevByName(generatedVDPADevName)
if err != nil {
return nil, fmt.Errorf("Failed to get vdpa device %q: %w", generatedVDPADevName, err)
}
vhostVDPA, err := getVhostVDPADevInPath(filepath.Join(vdpaBusDevDir, dev.Name))
if err != nil {
return nil, fmt.Errorf("Failed to get vdpa vhost %q: %w", dev.Name, err)
}
// Update the volatile map
volatile["last_state.vdpa.name"] = generatedVDPADevName
return &VDPADev{
Name: dev.Name,
MaxVQs: dev.MaxVQS,
VhostVDPA: vhostVDPA,
}, nil
}
// DeleteVDPADevice deletes a vDPA management device.
func DeleteVDPADevice(vDPADevName string) error {
return netlink.VDPADelDev(vDPADevName)
}
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