Use local routing in transit gateway when PowerVS and VPC are from same region #1777

dharaneeshvrd · 2024-05-15T09:56:44Z

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1763

Special notes for your reviewer:

/area provider/ibmcloud

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

Use local routing in transit gateway when PowerVS and VPC are from same region

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dharaneeshvrd · 2024-05-16T04:30:35Z

/cc @mkumatag @Karthik-K-N

Karthik-K-N · 2024-05-16T06:14:09Z

api/v1beta2/ibmpowervscluster_types.go

@@ -251,6 +251,9 @@ type TransitGateway struct {
 	// id of resource.
 	// +optional
 	ID *string `json:"id,omitempty"`
+	// globalRouting indicates whether to set global routing true or not while creating the transit gateway.


Lets also mention a liner about global routing and local routing and when to use which.
Also what system will do when the field is omitted like as we mentioned in other api types. Lets keep as descriptive as possible.

Karthik-K-N · 2024-05-16T06:26:07Z

cloud/scope/powervs_cluster.go

+		return nil, fmt.Errorf("failed to use local routing for transit gateway since powervs and vpc region used requires global routing")
+	}
+	// setting global routing to true when it is set by user.
+	if s.IBMPowerVSCluster.Spec.TransitGateway.GlobalRouting != nil && *s.IBMPowerVSCluster.Spec.TransitGateway.GlobalRouting && !*globalRouting {


I think here we need not check whats globalRouting, simply use Spec.TransitGateway.GlobalRouting

Karthik-K-N · 2024-05-16T06:43:31Z

cloud/scope/powervs_cluster.go

 	}
 	region := endpoints.ConstructRegionFromZone(*zone)
-	vpcRegion, err := genUtil.VPCRegionForPowerVSRegion(region)
+
+	if s.IBMPowerVSCluster.Spec.VPC != nil {


We can use s.VPC()

Karthik-K-N · 2024-05-16T06:44:21Z

cloud/scope/powervs_cluster.go

+// getTransitGatewayLocationAndRouting returns appropriate location and routing suitable for transit gateway.
+// routing indicates whether to enable global routing on transit gateway or not.
+// returns true when powervs and vpc region are not common otherwise false.
+func (s *PowerVSClusterScope) getTransitGatewayLocationAndRouting() (*string, *bool) {


I dont see any advantage of using pointer to bool , I think we can simply use bool instead.

Anyway I need to make it a pointer in called func, so just made it here and used as it is.

that makes sense.

Karthik-K-N · 2024-05-16T06:47:00Z

cloud/scope/powervs_cluster.go

-	vpcRegion, err := genUtil.VPCRegionForPowerVSRegion(region)
+
+	if s.IBMPowerVSCluster.Spec.VPC != nil {
+		routing := !genUtil.IsCommonPowerVSAndVPCRegion(region, *s.IBMPowerVSCluster.Spec.VPC.Region)


Isn't it confusing, can we simplify, Instead of negating the return value, Can we make this function to return localRouting instead of globalRouting?

Refactored the func a bit, I would like to keep the var as globalRouting since we are going to assign it to CreateTransitGatewayOptions.Global field.

that makes sense.

Karthik-K-N · 2024-05-16T09:54:35Z

api/v1beta2/ibmpowervscluster_types.go

@@ -251,6 +251,11 @@ type TransitGateway struct {
 	// id of resource.
 	// +optional
 	ID *string `json:"id,omitempty"`
+	// globalRouting indicates whether to set global routing true or not while creating the transit gateway.
+	// set this flag to true only when PowerVS and VPC are from different regions, if they are same it's suggested to use local routing by setting the flag to false.


Suggested change

// set this flag to true only when PowerVS and VPC are from different regions, if they are same it's suggested to use local routing by setting the flag to false.

// set this field to true only when PowerVS and VPC are from different regions, if they are same it's suggested to use local routing by setting the field to false.

Karthik-K-N · 2024-05-16T11:58:11Z

api/v1beta2/ibmpowervscluster_types.go

@@ -251,6 +251,11 @@ type TransitGateway struct {
 	// id of resource.
 	// +optional
 	ID *string `json:"id,omitempty"`
+	// globalRouting indicates whether to set global routing true or not while creating the transit gateway.
+	// set this flag to true only when PowerVS and VPC are from different regions, if they are same it's suggested to use local routing by setting the flag to false.
+	// if this flag is not set, based on where PowerVS and VPC regions are from would decide whether to enable globalRouting or not.


Suggested change

// if this flag is not set, based on where PowerVS and VPC regions are from would decide whether to enable globalRouting or not.

// when the field is omitted, based on PowerVS region (region associated with IBMPowerVSCluster.Spec.Zone) and VPC region(IBMPowerVSCluster.Spec.VPC.Region) system will decide whether to enable globalRouting or not.

Karthik-K-N

One suggestion otherwise LGTM
Thank you.

Karthik-K-N · 2024-05-17T02:56:31Z

cloud/scope/powervs_cluster.go

+		return nil, fmt.Errorf("failed to get transit gateway location")
+	}
+
+	// throw error when user tries to use local routing where global routing is required.


We can have this check in webhook as well, If required we can add a TODO.

Yes, we need to have this in another PR, currently util is importing v1beta2 pkg, which is causing circular import issue when accessing the region map from util in Webhook, added a todo handle this later.
Moved the GetTransitGatewayLocationAndRouting() to util to consume from Webhook validation later.

nice, Thanks

Karthik-K-N · 2024-05-17T02:59:38Z

cloud/scope/powervs_cluster.go

+	if s.VPC() != nil {
+		routing := genUtil.IsGlobalRoutingRequiredForTG(region, *s.IBMPowerVSCluster.Spec.VPC.Region)
+		return s.IBMPowerVSCluster.Spec.VPC.Region, &routing
+	}


Suggested change

if s.VPC() != nil {

routing := genUtil.IsGlobalRoutingRequiredForTG(region, *s.IBMPowerVSCluster.Spec.VPC.Region)

return s.IBMPowerVSCluster.Spec.VPC.Region, &routing

}

if vpc := s.VPC(); vpc != nil {

routing := genUtil.IsGlobalRoutingRequiredForTG(region, *vpc.Region)

return vpc.Region, &routing

}

Karthik-K-N · 2024-05-20T04:20:18Z

cloud/scope/powervs_cluster.go

+		return nil, fmt.Errorf("failed to get transit gateway location")
+	}
+
+	// throw error when user tries to use local routing where global routing is required.


nice, Thanks

Karthik-K-N · 2024-05-20T04:38:16Z

util/util.go

+	}
+
+	// returning routing as true since VPC region is not set and used PowerVS region to calculate the transit gateway location.
+	return &location, ptr.To(true), nil


Just curious to know for setting true, This case may not occur as we have a webhook check for making sure the vpc region is set, but incase it occurs any how we are getting VPC region associated with PowerVS so can't we use local routing?

thanks for pointing it out, its supposed to be local routing!😁

mkumatag

minor comment, otherwise LGTM

mkumatag · 2024-05-22T04:10:28Z

cloud/scope/powervs_cluster.go

+	// throw error when user tries to use local routing where global routing is required.
+	// TODO: Add a webhook validation for below condition.
+	if s.IBMPowerVSCluster.Spec.TransitGateway.GlobalRouting != nil && !*s.IBMPowerVSCluster.Spec.TransitGateway.GlobalRouting && *globalRouting {
+		return nil, fmt.Errorf("failed to use local routing for transit gateway since powervs and vpc region used requires global routing")


Suggested change

return nil, fmt.Errorf("failed to use local routing for transit gateway since powervs and vpc region used requires global routing")

return nil, fmt.Errorf("failed to use local routing for transit gateway since powervs and vpc are in different region and requires global routing")

Fixed it. PTAL now!

mkumatag · 2024-05-22T06:11:29Z

cloud/scope/powervs_cluster.go

+	// throw error when user tries to use local routing where global routing is required.
+	// TODO: Add a webhook validation for below condition.
+	if s.IBMPowerVSCluster.Spec.TransitGateway.GlobalRouting != nil && !*s.IBMPowerVSCluster.Spec.TransitGateway.GlobalRouting && *globalRouting {
+		return nil, fmt.Errorf("ailed to use local routing for transit gateway since powervs and vpc are in different region and requires global routing")


there is a typo!

Suggested change

return nil, fmt.Errorf("ailed to use local routing for transit gateway since powervs and vpc are in different region and requires global routing")

return nil, fmt.Errorf("failed to use local routing for transit gateway since powervs and vpc are in different region and requires global routing")

…me region

mkumatag

/lgtm

k8s-ci-robot · 2024-05-22T06:37:18Z

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Use local routing in transit gateway when PowerVS and VPC are from sa…

c0ec9d7

…me region

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Use local routing in transit gateway when PowerVS and VPC are from same region #1777

Use local routing in transit gateway when PowerVS and VPC are from same region #1777

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k8s-ci-robot commented May 22, 2024

	// set this flag to true only when PowerVS and VPC are from different regions, if they are same it's suggested to use local routing by setting the flag to false.
	// set this field to true only when PowerVS and VPC are from different regions, if they are same it's suggested to use local routing by setting the field to false.

	// if this flag is not set, based on where PowerVS and VPC regions are from would decide whether to enable globalRouting or not.
	// when the field is omitted, based on PowerVS region (region associated with IBMPowerVSCluster.Spec.Zone) and VPC region(IBMPowerVSCluster.Spec.VPC.Region) system will decide whether to enable globalRouting or not.

	return nil, fmt.Errorf("failed to use local routing for transit gateway since powervs and vpc region used requires global routing")
	return nil, fmt.Errorf("failed to use local routing for transit gateway since powervs and vpc are in different region and requires global routing")

	return nil, fmt.Errorf("ailed to use local routing for transit gateway since powervs and vpc are in different region and requires global routing")
	return nil, fmt.Errorf("failed to use local routing for transit gateway since powervs and vpc are in different region and requires global routing")

Use local routing in transit gateway when PowerVS and VPC are from same region #1777

Use local routing in transit gateway when PowerVS and VPC are from same region #1777

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