/
nicstobridge.go
383 lines (335 loc) · 11.1 KB
/
nicstobridge.go
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//go:build linux
// +build linux
package util
import (
"fmt"
"os"
"strings"
"syscall"
"github.com/k8snetworkplumbingwg/sriovnet"
"github.com/vishvananda/netlink"
"k8s.io/klog/v2"
)
const (
ubuntuDefaultFile = "/etc/default/openvswitch-switch"
rhelDefaultFile = "/etc/default/openvswitch"
)
func GetBridgeName(iface string) string {
return fmt.Sprintf("br%s", iface)
}
// getBridgePortsInterfaces returns a mapping of bridge brName ports to its interfaces
func getBridgePortsInterfaces(brName string) (map[string][]string, error) {
stdout, stderr, err := RunOVSVsctl("list-ports", brName)
if err != nil {
return nil, fmt.Errorf("failed to get list of ports on bridge %q:, stderr: %q, error: %v",
brName, stderr, err)
}
portsToInterfaces := make(map[string][]string)
for _, port := range strings.Split(stdout, "\n") {
stdout, stderr, err = RunOVSVsctl("get", "Port", port, "Interfaces")
if err != nil {
return nil, fmt.Errorf("failed to get port %q on bridge %q:, stderr: %q, error: %v",
port, brName, stderr, err)
}
// remove brackets on list of interfaces
ifaces := strings.TrimPrefix(strings.TrimSuffix(stdout, "]"), "[")
portsToInterfaces[port] = strings.Split(ifaces, ",")
}
return portsToInterfaces, nil
}
// GetNicName returns the physical NIC name, given an OVS bridge name
// configured by NicToBridge()
func GetNicName(brName string) (string, error) {
// Check for system type port (required to be set if using NetworkManager)
var stdout, stderr string
portsToInterfaces, err := getBridgePortsInterfaces(brName)
if err != nil {
return "", err
}
systemPorts := make([]string, 0)
for port, ifaces := range portsToInterfaces {
for _, iface := range ifaces {
stdout, stderr, err = RunOVSVsctl("get", "Interface", strings.TrimSpace(iface), "Type")
if err != nil {
return "", fmt.Errorf("failed to get Interface %q Type on bridge %q:, stderr: %q, error: %v",
iface, brName, stderr, err)
}
// If system Type we know this is the OVS port is the NIC
if stdout == "system" {
systemPorts = append(systemPorts, port)
}
}
}
if len(systemPorts) == 1 {
return systemPorts[0], nil
} else if len(systemPorts) > 1 {
klog.Infof("Found more than one system Type ports on the OVS bridge %s, so skipping "+
"this method of determining the uplink port", brName)
}
// Check for bridge-uplink to indicate the NIC
stdout, stderr, err = RunOVSVsctl(
"br-get-external-id", brName, "bridge-uplink")
if err != nil {
return "", fmt.Errorf("failed to get the bridge-uplink for the bridge %q:, stderr: %q, error: %v",
brName, stderr, err)
}
if stdout == "" && strings.HasPrefix(brName, "br") {
// This would happen if the bridge was created before the bridge-uplink
// changes got integrated. Assuming naming format of "br<nic name>".
return brName[len("br"):], nil
}
return stdout, nil
}
func saveIPAddress(oldLink, newLink netlink.Link, addrs []netlink.Addr) error {
for i := range addrs {
addr := addrs[i]
if addr.IP.IsGlobalUnicast() {
// Remove from oldLink
if err := netLinkOps.AddrDel(oldLink, &addr); err != nil {
klog.Errorf("Remove addr from %q failed: %v", oldLink.Attrs().Name, err)
return err
}
// Add to newLink
addr.Label = newLink.Attrs().Name
if err := netLinkOps.AddrAdd(newLink, &addr); err != nil {
klog.Errorf("Add addr %q to newLink %q failed: %v", addr.String(), addr.Label, err)
return err
}
klog.Infof("Successfully saved addr %q to newLink %q", addr.String(), addr.Label)
}
}
return netLinkOps.LinkSetUp(newLink)
}
// delAddRoute removes 'route' from 'oldLink' and moves to 'newLink'
func delAddRoute(oldLink, newLink netlink.Link, route netlink.Route) error {
// Remove route from old interface
if err := netLinkOps.RouteDel(&route); err != nil && !strings.Contains(err.Error(), "no such process") {
klog.Errorf("Remove route from %q failed: %v", oldLink.Attrs().Name, err)
return err
}
// Add route to newLink
route.LinkIndex = newLink.Attrs().Index
if err := netLinkOps.RouteAdd(&route); err != nil && !os.IsExist(err) {
klog.Errorf("Add route to newLink %q failed: %v", newLink.Attrs().Name, err)
return err
}
klog.Infof("Successfully saved route %q", route.String())
return nil
}
func saveRoute(oldLink, newLink netlink.Link, routes []netlink.Route) error {
for i := range routes {
route := routes[i]
// Handle routes for default gateway later. This is a special case for
// GCE where we have /32 IP addresses and we can't add the default
// gateway before the route to the gateway.
if IsAnyNetwork(route.Dst) && route.Gw != nil && route.LinkIndex > 0 {
continue
} else if route.Dst != nil && !route.Dst.IP.IsGlobalUnicast() {
continue
}
err := delAddRoute(oldLink, newLink, route)
if err != nil {
return err
}
}
// Now add the default gateway (if any) via this interface.
for i := range routes {
route := routes[i]
if IsAnyNetwork(route.Dst) && route.Gw != nil && route.LinkIndex > 0 {
// Remove route from 'oldLink' and move it to 'newLink'
err := delAddRoute(oldLink, newLink, route)
if err != nil {
return err
}
}
}
return nil
}
func setupDefaultFile() {
platform, err := runningPlatform()
if err != nil {
klog.Errorf("Failed to set OVS package default file (%v)", err)
return
}
var defaultFile, text string
if platform == ubuntu {
defaultFile = ubuntuDefaultFile
text = "OVS_CTL_OPTS=\"$OVS_CTL_OPTS --delete-transient-ports\""
} else if platform == rhel {
defaultFile = rhelDefaultFile
text = "OPTIONS=--delete-transient-ports"
} else {
return
}
fileContents, err := os.ReadFile(defaultFile)
if err != nil {
klog.Warningf("Failed to parse file %s (%v)",
defaultFile, err)
return
}
ss := strings.Split(string(fileContents), "\n")
for _, line := range ss {
if strings.Contains(line, "--delete-transient-ports") {
// Nothing to do
return
}
}
// The defaultFile does not contain '--delete-transient-ports' set.
// We should set it.
f, err := os.OpenFile(defaultFile, os.O_APPEND|os.O_WRONLY, 0o644)
if err != nil {
klog.Errorf("Failed to open %s to write (%v)", defaultFile, err)
return
}
defer f.Close()
if _, err = f.WriteString(text); err != nil {
klog.Errorf("Failed to write to %s (%v)",
defaultFile, err)
return
}
}
// NicToBridge creates a OVS bridge for the 'iface' and also moves the IP
// address and routes of 'iface' to OVS bridge.
func NicToBridge(iface string) (string, error) {
ifaceLink, err := netLinkOps.LinkByName(iface)
if err != nil {
return "", err
}
bridge := GetBridgeName(iface)
stdout, stderr, err := RunOVSVsctl(
"--", "--may-exist", "add-br", bridge,
"--", "br-set-external-id", bridge, "bridge-id", bridge,
"--", "br-set-external-id", bridge, "bridge-uplink", iface,
"--", "set", "bridge", bridge, "fail-mode=standalone",
fmt.Sprintf("other_config:hwaddr=%s", ifaceLink.Attrs().HardwareAddr),
"--", "--may-exist", "add-port", bridge, iface,
"--", "set", "port", iface, "other-config:transient=true")
if err != nil {
klog.Errorf("Failed to create OVS bridge, stdout: %q, stderr: %q, error: %v", stdout, stderr, err)
return "", err
}
klog.Infof("Successfully created OVS bridge %q", bridge)
setupDefaultFile()
// Get ip addresses and routes before any real operations.
family := syscall.AF_UNSPEC
addrs, err := netLinkOps.AddrList(ifaceLink, family)
if err != nil {
return "", err
}
routes, err := netLinkOps.RouteList(ifaceLink, family)
if err != nil {
return "", err
}
bridgeLink, err := netLinkOps.LinkByName(bridge)
if err != nil {
return "", err
}
// save ip addresses to bridge.
if err = saveIPAddress(ifaceLink, bridgeLink, addrs); err != nil {
return "", err
}
// save routes to bridge.
if err = saveRoute(ifaceLink, bridgeLink, routes); err != nil {
return "", err
}
return bridge, nil
}
// BridgeToNic moves the IP address and routes of internal port of the bridge to
// underlying NIC interface and deletes the OVS bridge.
func BridgeToNic(bridge string) error {
// Internal port is named same as the bridge
bridgeLink, err := netLinkOps.LinkByName(bridge)
if err != nil {
return err
}
// Get ip addresses and routes before any real operations.
family := syscall.AF_UNSPEC
addrs, err := netLinkOps.AddrList(bridgeLink, family)
if err != nil {
return err
}
routes, err := netLinkOps.RouteList(bridgeLink, family)
if err != nil {
return err
}
nicName, err := GetNicName(bridge)
if err != nil {
return err
}
ifaceLink, err := netLinkOps.LinkByName(nicName)
if err != nil {
return err
}
// save ip addresses to iface.
if err = saveIPAddress(bridgeLink, ifaceLink, addrs); err != nil {
return err
}
// save routes to iface.
if err = saveRoute(bridgeLink, ifaceLink, routes); err != nil {
return err
}
// for every bridge interface that is of type "patch", find the peer
// interface and delete that interface from the integration bridge
stdout, stderr, err := RunOVSVsctl("list-ifaces", bridge)
if err != nil {
klog.Errorf("Failed to get interfaces for OVS bridge: %q, "+
"stderr: %q, error: %v", bridge, stderr, err)
return err
}
ifacesList := strings.Split(strings.TrimSpace(stdout), "\n")
for _, iface := range ifacesList {
stdout, stderr, err = RunOVSVsctl("get", "interface", iface, "type")
if err != nil {
klog.Warningf("Failed to determine the type of interface: %q, "+
"stderr: %q, error: %v", iface, stderr, err)
continue
} else if stdout != "patch" {
continue
}
stdout, stderr, err = RunOVSVsctl("get", "interface", iface, "options:peer")
if err != nil {
klog.Warningf("Failed to get the peer port for patch interface: %q, "+
"stderr: %q, error: %v", iface, stderr, err)
continue
}
// stdout has the peer interface, just delete it
peer := strings.TrimSpace(stdout)
_, stderr, err = RunOVSVsctl("--if-exists", "del-port", "br-int", peer)
if err != nil {
klog.Warningf("Failed to delete patch port %q on br-int, "+
"stderr: %q, error: %v", peer, stderr, err)
}
}
// Now delete the bridge
stdout, stderr, err = RunOVSVsctl("--", "--if-exists", "del-br", bridge)
if err != nil {
klog.Errorf("Failed to delete OVS bridge, stdout: %q, stderr: %q, error: %v", stdout, stderr, err)
return err
}
klog.Infof("Successfully deleted OVS bridge %q", bridge)
return nil
}
// GetDPUHostInterface returns the host representor interface attached to bridge
func GetDPUHostInterface(bridgeName string) (string, error) {
portsToInterfaces, err := getBridgePortsInterfaces(bridgeName)
if err != nil {
return "", err
}
for _, ifaces := range portsToInterfaces {
for _, iface := range ifaces {
stdout, stderr, err := RunOVSVsctl("get", "Interface", strings.TrimSpace(iface), "Name")
if err != nil {
return "", fmt.Errorf("failed to get Interface %q Name on bridge %q:, stderr: %q, error: %v",
iface, bridgeName, stderr, err)
}
flavor, err := GetSriovnetOps().GetRepresentorPortFlavour(stdout)
if err == nil && flavor == sriovnet.PORT_FLAVOUR_PCI_PF {
// host representor interface found
return stdout, nil
}
continue
}
}
// No host interface found in provided bridge
return "", fmt.Errorf("dpu host interface was not found for bridge %q", bridgeName)
}