forked from vishvananda/netlink
-
Notifications
You must be signed in to change notification settings - Fork 0
/
rdma_link_linux.go
331 lines (279 loc) · 9.42 KB
/
rdma_link_linux.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
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 execRdmaSetLink(req *nl.NetlinkRequest) error {
_, err := req.Execute(unix.NETLINK_RDMA, 0)
return err
}
// RdmaLinkList gets a list of RDMA link devices.
// Equivalent to: `rdma dev show`
func RdmaLinkList() ([]*RdmaLink, error) {
return pkgHandle.RdmaLinkList()
}
// RdmaLinkList gets a list of RDMA link devices.
// Equivalent to: `rdma dev show`
func (h *Handle) RdmaLinkList() ([]*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)
msgs, err := req.Execute(unix.NETLINK_RDMA, 0)
if err != nil {
return nil, err
}
var res []*RdmaLink
for _, m := range msgs {
link, err := executeOneGetRdmaLink(m)
if err != nil {
return nil, err
}
res = append(res, link)
}
return res, nil
}
// 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) {
links, err := h.RdmaLinkList()
if err != nil {
return nil, err
}
for _, link := range links {
if link.Attrs.Name == name {
return link, nil
}
}
return nil, fmt.Errorf("Rdma device %v not found", 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)
}
// RdmaLinkDel deletes an rdma link
//
// Similar to: rdma link delete NAME
// REF: https://man7.org/linux/man-pages/man8/rdma-link.8.html
func RdmaLinkDel(name string) error {
return pkgHandle.RdmaLinkDel(name)
}
// RdmaLinkDel deletes an rdma link.
func (h *Handle) RdmaLinkDel(name string) error {
link, err := h.RdmaLinkByName(name)
if err != nil {
return err
}
proto := getProtoField(nl.RDMA_NL_NLDEV, nl.RDMA_NLDEV_CMD_DELLINK)
req := h.newNetlinkRequest(proto, unix.NLM_F_ACK)
b := make([]byte, 4)
native.PutUint32(b, link.Attrs.Index)
req.AddData(nl.NewRtAttr(nl.RDMA_NLDEV_ATTR_DEV_INDEX, b))
_, err = req.Execute(unix.NETLINK_RDMA, 0)
return err
}
// RdmaLinkAdd adds an rdma link for the specified type to the network device.
// Similar to: rdma link add NAME type TYPE netdev NETDEV
// NAME - specifies the new name of the rdma link to add
// TYPE - specifies which rdma type to use. Link types:
// rxe - Soft RoCE driver
// siw - Soft iWARP driver
// NETDEV - specifies the network device to which the link is bound
//
// REF: https://man7.org/linux/man-pages/man8/rdma-link.8.html
func RdmaLinkAdd(linkName, linkType, netdev string) error {
return pkgHandle.RdmaLinkAdd(linkName, linkType, netdev)
}
// RdmaLinkAdd adds an rdma link for the specified type to the network device.
func (h *Handle) RdmaLinkAdd(linkName string, linkType string, netdev string) error {
proto := getProtoField(nl.RDMA_NL_NLDEV, nl.RDMA_NLDEV_CMD_NEWLINK)
req := h.newNetlinkRequest(proto, unix.NLM_F_ACK)
req.AddData(nl.NewRtAttr(nl.RDMA_NLDEV_ATTR_DEV_NAME, nl.ZeroTerminated(linkName)))
req.AddData(nl.NewRtAttr(nl.RDMA_NLDEV_ATTR_LINK_TYPE, nl.ZeroTerminated(linkType)))
req.AddData(nl.NewRtAttr(nl.RDMA_NLDEV_ATTR_NDEV_NAME, nl.ZeroTerminated(netdev)))
_, err := req.Execute(unix.NETLINK_RDMA, 0)
return err
}