/
netdiscover.go
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/
netdiscover.go
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// Copyright 2017-20 Daniel Swarbrick. All rights reserved.
// SPDX-License-Identifier: GPL-3.0-or-later
package infiniband
// #cgo CFLAGS: -I/usr/include/infiniband
// #cgo LDFLAGS: -libnetdisc
// #include <umad.h>
// #include <ibnetdisc.h>
// #include <iba/ib_types.h>
import "C"
import (
"fmt"
"log/slog"
"os"
"time"
"unsafe"
)
type HCA struct {
Name string
// umad_ca_t contains an array of pointers - associated memory must be freed with
// umad_release_ca(umad_ca_t *ca)
umad_ca *C.umad_ca_t
}
func (h *HCA) NetDiscover(output chan Fabric, mkey uint64, resetThreshold uint) {
var (
totalNodes, totalPorts int
)
mgmt_classes := [...]C.int{C.IB_SMI_CLASS, C.IB_SA_CLASS, C.IB_PERFORMANCE_CLASS}
hostname, _ := os.Hostname()
start := time.Now()
// Iterate over CA's umad_port array
for _, umad_port := range h.umad_ca.ports {
// umad_ca.ports may contain noncontiguous umad_port pointers
if umad_port == nil {
continue
}
portNum := int(umad_port.portnum)
linkLayer := C.GoString(&umad_port.link_layer[0])
portLog := slog.With("ca", h.Name, "port", portNum)
if linkLayer != "InfiniBand" && linkLayer != "IB" {
portLog.Debug("skipping port with unsupported link layer", "link_layer", linkLayer)
continue
}
portLog.Debug("polling port")
// ibnd_config_t specifies max hops, timeout, max SMPs etc
config := C.ibnd_config_t{flags: C.IBND_CONFIG_MLX_EPI, mkey: C.uint64_t(mkey)}
// NOTE: Under ibsim, this will fail after a certain number of iterations with a
// mad_rpc_open_port() error (presumably due to a resource leak in ibsim).
// ibnd_fabric_t *ibnd_discover_fabric(char *ca_name, int ca_port, ib_portid_t *from, ibnd_config_t *config)
fabric, err := C.ibnd_discover_fabric(&h.umad_ca.ca_name[0], umad_port.portnum, nil, &config)
if err != nil {
portLog.Error("unable to discover fabric", "err", err)
continue
}
// Open MAD port, which is needed for getting port counters.
// struct ibmad_port *mad_rpc_open_port(char *dev_name, int dev_port, int *mgmt_classes, int num_classes)
mad_port := C.mad_rpc_open_port(&h.umad_ca.ca_name[0], umad_port.portnum, &mgmt_classes[0], C.int(len(mgmt_classes)))
if mad_port != nil {
nodes := walkFabric(fabric, mad_port, resetThreshold)
C.mad_rpc_close_port(mad_port)
totalNodes += len(nodes)
for _, n := range nodes {
totalPorts += len(n.Ports)
}
if output != nil {
output <- Fabric{
Hostname: hostname,
CAName: h.Name,
SourcePort: portNum,
Nodes: nodes,
}
}
} else {
portLog.Error("unable to open MAD port")
}
C.ibnd_destroy_fabric(fabric)
}
slog.Info("netdiscover complete",
"duration", time.Since(start), "nodes", totalNodes, "ports", totalPorts)
}
func (h *HCA) Release() {
// Free associated memory from pointers in umad_ca_t.ports
if C.umad_release_ca(h.umad_ca) < 0 {
slog.Error("umad_release_ca", "umad_ca", h.umad_ca)
}
}
func GetCAs() []HCA {
caNames := umadGetCANames()
hcas := make([]HCA, len(caNames))
for i, caName := range caNames {
var ca C.umad_ca_t
ca_name := C.CString(caName)
C.umad_get_ca(ca_name, &ca)
C.free(unsafe.Pointer(ca_name))
slog.Info("found HCA",
"ca", C.GoString(&ca.ca_name[0]),
"type", C.GoString(&ca.ca_type[0]),
"ports", ca.numports,
"firmware", C.GoString(&ca.fw_ver[0]),
"hardware", C.GoString(&ca.hw_ver[0]),
"node_guid", fmt.Sprintf("%#016x", ntohll(uint64(ca.node_guid))),
"system_guid", fmt.Sprintf("%#016x", ntohll(uint64(ca.system_guid))))
hcas[i] = HCA{
Name: caName,
umad_ca: &ca,
}
}
return hcas
}
type ibndNode struct {
ibnd_node *C.struct_ibnd_node
slog *slog.Logger
}
// getPortCounters retrieves all counters for a specific port.
// Note: In PortCounters, PortCountersExtended, PortXmitDataSL, and PortRcvDataSL, components that
// represent Data (e.g. PortXmitData and PortRcvData) indicate octets divided by 4 rather than just
// octets.
func (n *ibndNode) getPortCounters(portId *C.ib_portid_t, portNum int, ibmadPort *C.struct_ibmad_port, resetThreshold uint) (map[uint32]interface{}, error) {
var buf [1024]byte
counters := make(map[uint32]interface{})
portLog := n.slog.With("port", portNum)
// PerfMgt ClassPortInfo is a required attribute. See ClassPortInfo, IBTA spec v1.3, table 126.
pmaBuf := C.pma_query_via(unsafe.Pointer(&buf), portId, C.int(portNum), PMA_TIMEOUT, C.CLASS_PORT_INFO, ibmadPort)
if pmaBuf == nil {
return counters, fmt.Errorf("CLASS_PORT_INFO query failed")
}
// Keep capMask in network byte order for easier bitwise operations with capabilities contants.
capMask := htons(uint16(C.mad_get_field(unsafe.Pointer(&buf), 0, C.IB_CPI_CAPMASK_F)))
// Fetch standard (32 bit (or less)) counters
pmaBuf = C.pma_query_via(unsafe.Pointer(&buf), portId, C.int(portNum), PMA_TIMEOUT, C.IB_GSI_PORT_COUNTERS, ibmadPort)
if pmaBuf != nil {
var selMask uint32
// Iterate over standard counters
for field, counter := range StdCounterMap {
if (field == C.IB_PC_XMT_WAIT_F) && (capMask&C.IB_PM_PC_XMIT_WAIT_SUP == 0) {
continue // Counter not supported
}
counters[field] = uint32(C.mad_get_field(unsafe.Pointer(&buf), 0, field))
if float64(counters[field].(uint32)) > (float64(counter.Limit) * float64(resetThreshold) / 100) {
portLog.Warn("counter exceeds threshold", "counter", counter.Name, "value", counters[field])
selMask |= counter.Select
}
}
if selMask > 0 {
var pc [1024]byte
resetLog := portLog.With("select_mask", fmt.Sprintf("%#x", selMask))
resetLog.Warn("resetting counters")
if C.performance_reset_via(unsafe.Pointer(&pc), portId, C.int(portNum), C.uint(selMask), PMA_TIMEOUT, C.IB_GSI_PORT_COUNTERS, ibmadPort) == nil {
resetLog.Error("performance_reset_via failed")
}
}
}
if (capMask&C.IB_PM_EXT_WIDTH_SUPPORTED == 0) && (capMask&C.IB_PM_EXT_WIDTH_NOIETF_SUP == 0) {
// TODO: Fetch standard data / packet counters if extended counters are not supported
// (pre-QDR hardware).
portLog.Warn("port does not support extended counters")
return counters, nil
}
// Fetch extended (64 bit) counters
pmaBuf = C.pma_query_via(unsafe.Pointer(&buf), portId, C.int(portNum), PMA_TIMEOUT, C.IB_GSI_PORT_COUNTERS_EXT, ibmadPort)
if pmaBuf != nil {
for field := range ExtCounterMap {
counters[field] = uint64(C.mad_get_field64(unsafe.Pointer(&buf), 0, field))
}
}
return counters, nil
}
func (n *ibndNode) guid() uint64 {
return uint64(n.ibnd_node.guid)
}
func (n *ibndNode) guidString() string {
return fmt.Sprintf("%#016x", n.ibnd_node.guid)
}
func (n *ibndNode) nodeDesc() string {
return C.GoString(&n.ibnd_node.nodedesc[0])
}
// simpleNode returns a Node structure, containing only safe Go types, suitable for asynchronous
// access, even if the original fabric pointers have been freed.
func (n *ibndNode) simpleNode() Node {
if n.ibnd_node == nil {
return Node{}
}
node := Node{
GUID: n.guid(),
NodeType: int(n.ibnd_node._type),
NodeDesc: nnMap.RemapNodeName(n.guid(), n.nodeDesc()),
VendorID: uint(C.mad_get_field(unsafe.Pointer(&n.ibnd_node.info), 0, C.IB_NODE_VENDORID_F)),
DeviceID: uint(C.mad_get_field(unsafe.Pointer(&n.ibnd_node.info), 0, C.IB_NODE_DEVID_F)),
}
return node
}
func (n *ibndNode) walkPorts(mad_port *C.struct_ibmad_port, resetThreshold uint) []Port {
var portid C.ib_portid_t
n.slog.Debug("walking ports for node", "node_type", n.ibnd_node._type, "num_ports", n.ibnd_node.numports)
ports := make([]Port, n.ibnd_node.numports+1)
C.ib_portid_set(&portid, C.int(n.ibnd_node.smalid), 0, 0)
// node.ports is an array of ports, indexed by port number:
// ports[1] == port 1,
// ports[2] == port 2,
// etc...
// Any port in the array MAY BE NIL! Most notably, non-switches have no port zero, therefore
// ports[0] == nil for those nodes!
arrayPtr := uintptr(unsafe.Pointer(n.ibnd_node.ports))
for portNum := 0; portNum <= int(n.ibnd_node.numports); portNum++ {
var (
info *[C.IB_SMP_DATA_SIZE]C.uchar
linkSpeedExt uint
)
portLog := n.slog.With("port", portNum)
// Get pointer to port struct at portNum array offset
pp := *(**C.ibnd_port_t)(unsafe.Pointer(arrayPtr + unsafe.Sizeof(arrayPtr)*uintptr(portNum)))
if pp == nil {
continue
}
myPort := Port{GUID: uint64(pp.guid)}
portState := C.mad_get_field(unsafe.Pointer(&pp.info), 0, C.IB_PORT_STATE_F)
physState := C.mad_get_field(unsafe.Pointer(&pp.info), 0, C.IB_PORT_PHYS_STATE_F)
// C14-24.2.1 states that a down port allows for invalid data to be returned for all
// PortInfo components except PortState and PortPhysicalState.
if portState == C.IB_LINK_DOWN {
ports[portNum] = myPort
continue
}
linkWidth := C.mad_get_field(unsafe.Pointer(&pp.info), 0, C.IB_PORT_LINK_WIDTH_ACTIVE_F)
myPort.LinkWidth = LinkWidthToStr(uint(linkWidth))
// Check for extended speed support
if n.ibnd_node._type == C.IB_NODE_SWITCH {
info = &(*(**C.ibnd_port_t)(unsafe.Pointer(arrayPtr))).info
} else {
info = &pp.info
}
capMask := htonl(uint32(C.mad_get_field(unsafe.Pointer(info), 0, C.IB_PORT_CAPMASK_F)))
if capMask&C.IB_PORT_CAP_HAS_EXT_SPEEDS != 0 {
linkSpeedExt = uint(C.mad_get_field(unsafe.Pointer(&pp.info), 0, C.IB_PORT_LINK_SPEED_EXT_ACTIVE_F))
}
if linkSpeedExt > 0 {
myPort.LinkSpeed = LinkSpeedExtToStr(linkSpeedExt)
} else {
fdr10 := C.mad_get_field(unsafe.Pointer(&pp.ext_info), 0, C.IB_MLNX_EXT_PORT_LINK_SPEED_ACTIVE_F) & C.FDR10
if fdr10 != 0 {
myPort.LinkSpeed = "FDR10"
} else {
linkSpeed := C.mad_get_field(unsafe.Pointer(&pp.info), 0, C.IB_PORT_LINK_SPEED_ACTIVE_F)
myPort.LinkSpeed = LinkSpeedToStr(uint(linkSpeed))
}
}
portLog.Debug("port info",
"port_state", PortStateToStr(uint(portState)),
"phys_state", PortPhysStateToStr(uint(physState)),
"link_width", myPort.LinkWidth,
"link_speed", myPort.LinkSpeed)
// Remote port may be nil if port state is polling / armed.
rp := pp.remoteport
if rp != nil {
myPort.RemoteGUID = uint64(rp.node.guid)
myPort.RemoteNodeDesc = C.GoString(&rp.node.nodedesc[0])
// Port counters will only be fetched if port is ACTIVE + LINKUP
if (portState == C.IB_LINK_ACTIVE) && (physState == C.IB_PORT_PHYS_STATE_LINKUP) {
// Determine max width supported by both ends
maxWidth := maxPow2Divisor(
uint(C.mad_get_field(unsafe.Pointer(&pp.info), 0, C.IB_PORT_LINK_WIDTH_SUPPORTED_F)),
uint(C.mad_get_field(unsafe.Pointer(&rp.info), 0, C.IB_PORT_LINK_WIDTH_SUPPORTED_F)))
if uint(linkWidth) != maxWidth {
portLog.Warn("link width is not the max width supported by both ports")
}
// Determine max speed supported by both ends
// TODO: Check for possible FDR10 support (ext_info IB_MLNX_EXT_PORT_LINK_SPEED_SUPPORTED_F)
// TODO: Check for possible extended speed (info IB_PORT_LINK_SPEED_EXT_SUPPORTED_F)
/*
maxSpeed := maxPow2Divisor(
uint(C.mad_get_field(unsafe.Pointer(&pp.info), 0, C.IB_PORT_LINK_SPEED_SUPPORTED_F)),
uint(C.mad_get_field(unsafe.Pointer(&rp.info), 0, C.IB_PORT_LINK_SPEED_SUPPORTED_F)))
if uint(linkSpeed) != maxSpeed {
log.Warnf("Port %d link speed is not the max speed supported by both ports",
portNum)
}
*/
if counters, err := n.getPortCounters(&portid, portNum, mad_port, resetThreshold); err == nil {
myPort.Counters = counters
} else {
portLog.Error("cannot get counters for port", "err", err)
}
}
}
ports[portNum] = myPort
}
return ports
}
func walkFabric(fabric *C.struct_ibnd_fabric, mad_port *C.struct_ibmad_port, resetThreshold uint) []Node {
nodes := make([]Node, 0)
for node := fabric.nodes; node != nil; node = node.next {
n := ibndNode{ibnd_node: node}
n.slog = slog.With(
"node_desc", nnMap.RemapNodeName(n.guid(), n.nodeDesc()),
"node_guid", n.guidString(),
)
myNode := n.simpleNode()
if n.ibnd_node._type == C.IB_NODE_SWITCH {
myNode.Ports = n.walkPorts(mad_port, resetThreshold)
}
nodes = append(nodes, myNode)
}
return nodes
}