diff options
Diffstat (limited to 'vendor/github.com/vishvananda/netlink/rdma_link_linux.go')
-rw-r--r-- | vendor/github.com/vishvananda/netlink/rdma_link_linux.go | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/vendor/github.com/vishvananda/netlink/rdma_link_linux.go b/vendor/github.com/vishvananda/netlink/rdma_link_linux.go new file mode 100644 index 000000000..2d0bdc8c3 --- /dev/null +++ b/vendor/github.com/vishvananda/netlink/rdma_link_linux.go @@ -0,0 +1,264 @@ +package netlink + +import ( + "bytes" + "encoding/binary" + "fmt" + "net" + + "github.com/vishvananda/netlink/nl" + "golang.org/x/sys/unix" +) + +// LinkAttrs represents data shared by most link types +type RdmaLinkAttrs struct { + Index uint32 + Name string + FirmwareVersion string + NodeGuid string + SysImageGuid string +} + +// Link represents a rdma device from netlink. +type RdmaLink struct { + Attrs RdmaLinkAttrs +} + +func getProtoField(clientType int, op int) int { + return ((clientType << nl.RDMA_NL_GET_CLIENT_SHIFT) | op) +} + +func uint64ToGuidString(guid uint64) string { + //Convert to byte array + sysGuidBytes := new(bytes.Buffer) + binary.Write(sysGuidBytes, binary.LittleEndian, guid) + + //Convert to HardwareAddr + sysGuidNet := net.HardwareAddr(sysGuidBytes.Bytes()) + + //Get the String + return sysGuidNet.String() +} + +func executeOneGetRdmaLink(data []byte) (*RdmaLink, error) { + + link := RdmaLink{} + + reader := bytes.NewReader(data) + for reader.Len() >= 4 { + _, attrType, len, value := parseNfAttrTLV(reader) + + switch attrType { + case nl.RDMA_NLDEV_ATTR_DEV_INDEX: + var Index uint32 + r := bytes.NewReader(value) + binary.Read(r, nl.NativeEndian(), &Index) + link.Attrs.Index = Index + case nl.RDMA_NLDEV_ATTR_DEV_NAME: + link.Attrs.Name = string(value[0 : len-1]) + case nl.RDMA_NLDEV_ATTR_FW_VERSION: + link.Attrs.FirmwareVersion = string(value[0 : len-1]) + case nl.RDMA_NLDEV_ATTR_NODE_GUID: + var guid uint64 + r := bytes.NewReader(value) + binary.Read(r, nl.NativeEndian(), &guid) + link.Attrs.NodeGuid = uint64ToGuidString(guid) + case nl.RDMA_NLDEV_ATTR_SYS_IMAGE_GUID: + var sysGuid uint64 + r := bytes.NewReader(value) + binary.Read(r, nl.NativeEndian(), &sysGuid) + link.Attrs.SysImageGuid = uint64ToGuidString(sysGuid) + } + if (len % 4) != 0 { + // Skip pad bytes + reader.Seek(int64(4-(len%4)), seekCurrent) + } + } + return &link, nil +} + +func execRdmaGetLink(req *nl.NetlinkRequest, name string) (*RdmaLink, error) { + + msgs, err := req.Execute(unix.NETLINK_RDMA, 0) + if err != nil { + return nil, err + } + for _, m := range msgs { + link, err := executeOneGetRdmaLink(m) + if err != nil { + return nil, err + } + if link.Attrs.Name == name { + return link, nil + } + } + return nil, fmt.Errorf("Rdma device %v not found", name) +} + +func execRdmaSetLink(req *nl.NetlinkRequest) error { + + _, err := req.Execute(unix.NETLINK_RDMA, 0) + return err +} + +// RdmaLinkByName finds a link by name and returns a pointer to the object if +// found and nil error, otherwise returns error code. +func RdmaLinkByName(name string) (*RdmaLink, error) { + return pkgHandle.RdmaLinkByName(name) +} + +// RdmaLinkByName finds a link by name and returns a pointer to the object if +// found and nil error, otherwise returns error code. +func (h *Handle) RdmaLinkByName(name string) (*RdmaLink, error) { + + proto := getProtoField(nl.RDMA_NL_NLDEV, nl.RDMA_NLDEV_CMD_GET) + req := h.newNetlinkRequest(proto, unix.NLM_F_ACK|unix.NLM_F_DUMP) + + return execRdmaGetLink(req, name) +} + +// RdmaLinkSetName sets the name of the rdma link device. Return nil on success +// or error otherwise. +// Equivalent to: `rdma dev set $old_devname name $name` +func RdmaLinkSetName(link *RdmaLink, name string) error { + return pkgHandle.RdmaLinkSetName(link, name) +} + +// RdmaLinkSetName sets the name of the rdma link device. Return nil on success +// or error otherwise. +// Equivalent to: `rdma dev set $old_devname name $name` +func (h *Handle) RdmaLinkSetName(link *RdmaLink, name string) error { + proto := getProtoField(nl.RDMA_NL_NLDEV, nl.RDMA_NLDEV_CMD_SET) + req := h.newNetlinkRequest(proto, unix.NLM_F_ACK) + + b := make([]byte, 4) + native.PutUint32(b, uint32(link.Attrs.Index)) + data := nl.NewRtAttr(nl.RDMA_NLDEV_ATTR_DEV_INDEX, b) + req.AddData(data) + + b = make([]byte, len(name)+1) + copy(b, name) + data = nl.NewRtAttr(nl.RDMA_NLDEV_ATTR_DEV_NAME, b) + req.AddData(data) + + return execRdmaSetLink(req) +} + +func netnsModeToString(mode uint8) string { + switch mode { + case 0: + return "exclusive" + case 1: + return "shared" + default: + return "unknown" + } +} + +func executeOneGetRdmaNetnsMode(data []byte) (string, error) { + reader := bytes.NewReader(data) + for reader.Len() >= 4 { + _, attrType, len, value := parseNfAttrTLV(reader) + + switch attrType { + case nl.RDMA_NLDEV_SYS_ATTR_NETNS_MODE: + var mode uint8 + r := bytes.NewReader(value) + binary.Read(r, nl.NativeEndian(), &mode) + return netnsModeToString(mode), nil + } + if (len % 4) != 0 { + // Skip pad bytes + reader.Seek(int64(4-(len%4)), seekCurrent) + } + } + return "", fmt.Errorf("Invalid netns mode") +} + +// RdmaSystemGetNetnsMode gets the net namespace mode for RDMA subsystem +// Returns mode string and error status as nil on success or returns error +// otherwise. +// Equivalent to: `rdma system show netns' +func RdmaSystemGetNetnsMode() (string, error) { + return pkgHandle.RdmaSystemGetNetnsMode() +} + +// RdmaSystemGetNetnsMode gets the net namespace mode for RDMA subsystem +// Returns mode string and error status as nil on success or returns error +// otherwise. +// Equivalent to: `rdma system show netns' +func (h *Handle) RdmaSystemGetNetnsMode() (string, error) { + + proto := getProtoField(nl.RDMA_NL_NLDEV, nl.RDMA_NLDEV_CMD_SYS_GET) + req := h.newNetlinkRequest(proto, unix.NLM_F_ACK) + + msgs, err := req.Execute(unix.NETLINK_RDMA, 0) + if err != nil { + return "", err + } + if len(msgs) == 0 { + return "", fmt.Errorf("No valid response from kernel") + } + return executeOneGetRdmaNetnsMode(msgs[0]) +} + +func netnsModeStringToUint8(mode string) (uint8, error) { + switch mode { + case "exclusive": + return 0, nil + case "shared": + return 1, nil + default: + return 0, fmt.Errorf("Invalid mode; %q", mode) + } +} + +// RdmaSystemSetNetnsMode sets the net namespace mode for RDMA subsystem +// Returns nil on success or appropriate error code. +// Equivalent to: `rdma system set netns { shared | exclusive }' +func RdmaSystemSetNetnsMode(NewMode string) error { + return pkgHandle.RdmaSystemSetNetnsMode(NewMode) +} + +// RdmaSystemSetNetnsMode sets the net namespace mode for RDMA subsystem +// Returns nil on success or appropriate error code. +// Equivalent to: `rdma system set netns { shared | exclusive }' +func (h *Handle) RdmaSystemSetNetnsMode(NewMode string) error { + value, err := netnsModeStringToUint8(NewMode) + if err != nil { + return err + } + + proto := getProtoField(nl.RDMA_NL_NLDEV, nl.RDMA_NLDEV_CMD_SYS_SET) + req := h.newNetlinkRequest(proto, unix.NLM_F_ACK) + + data := nl.NewRtAttr(nl.RDMA_NLDEV_SYS_ATTR_NETNS_MODE, []byte{value}) + req.AddData(data) + + _, err = req.Execute(unix.NETLINK_RDMA, 0) + return err +} + +// RdmaLinkSetNsFd puts the RDMA device into a new network namespace. The +// fd must be an open file descriptor to a network namespace. +// Similar to: `rdma dev set $dev netns $ns` +func RdmaLinkSetNsFd(link *RdmaLink, fd uint32) error { + return pkgHandle.RdmaLinkSetNsFd(link, fd) +} + +// RdmaLinkSetNsFd puts the RDMA device into a new network namespace. The +// fd must be an open file descriptor to a network namespace. +// Similar to: `rdma dev set $dev netns $ns` +func (h *Handle) RdmaLinkSetNsFd(link *RdmaLink, fd uint32) error { + proto := getProtoField(nl.RDMA_NL_NLDEV, nl.RDMA_NLDEV_CMD_SET) + req := h.newNetlinkRequest(proto, unix.NLM_F_ACK) + + data := nl.NewRtAttr(nl.RDMA_NLDEV_ATTR_DEV_INDEX, + nl.Uint32Attr(link.Attrs.Index)) + req.AddData(data) + + data = nl.NewRtAttr(nl.RDMA_NLDEV_NET_NS_FD, nl.Uint32Attr(fd)) + req.AddData(data) + + return execRdmaSetLink(req) +} |