Set kernel param PCI realloc on "cannot allocate memory" on VF creation

When creating VFs via sysfs sriov_numvfs, there is a chance of getting the error "cannot allocate memory". This could occur when the BIOS is not providing enough MMIO space for VFs. A solution is to reallocate the MMIO space via "pci=realloc". Signed-off-by: William Zhao <[email protected]>
k8snetworkplumbingwg · Aug 23, 2023 · 8c1b6d5 · 8c1b6d5
1 parent 24c3fb4
commit 8c1b6d5
Show file tree

Hide file tree

Showing 2 changed files with 4 additions and 0 deletions.
diff --git a/pkg/plugins/generic/generic_plugin.go b/pkg/plugins/generic/generic_plugin.go
@@ -169,6 +169,9 @@ func (p *GenericPlugin) Apply() error {
 	}
 
 	if err := utils.SyncNodeState(p.DesireState, pfsToSkip); err != nil {
+		if strings.Contains(err.Error(), "cannot allocate memory") {
+			p.addToDesiredKernelParams(utils.KernelParamPciRealloc)
+		}
 		return err
 	}
 	p.LastState = &sriovnetworkv1.SriovNetworkNodeState{}

diff --git a/pkg/utils/utils.go b/pkg/utils/utils.go
@@ -42,6 +42,7 @@ const (
 	DeviceBF2             = "a2d6"
 	DeviceBF3             = "a2dc"
 
+	KernelParamPciRealloc = "pci=realloc"
 	KernelParamIntelIommu = "intel_iommu=on"
 	KernelParamIommuPt    = "iommu=pt"
 )