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Date: Wed, 1 Nov 2017 20:52:56 +0000 From: Jake Oshins <jakeo@...rosoft.com> To: Dexuan Cui <decui@...rosoft.com>, Bjorn Helgaas <bhelgaas@...gle.com>, "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>, KY Srinivasan <kys@...rosoft.com>, Stephen Hemminger <sthemmin@...rosoft.com> CC: "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Haiyang Zhang <haiyangz@...rosoft.com>, Jork Loeser <Jork.Loeser@...rosoft.com>, "Chris Valean (Cloudbase Solutions SRL)" <v-chvale@...rosoft.com>, "Adrian Suhov (Cloudbase Solutions SRL)" <v-adsuho@...rosoft.com>, Simon Xiao <sixiao@...rosoft.com>, 'Eyal Mizrachi' <eyalmi@...lanox.com>, "Jack Morgenstein" <jackm@...lanox.com>, Armen Guezalian <armeng@...lanox.com>, Firas Mahameed <firas@...lanox.com>, Tziporet Koren <tziporet@...lanox.com>, Daniel Jurgens <danielj@...lanox.com> Subject: RE: [PATCH] PCI: hv: use effective affinity mask > -----Original Message----- > From: Dexuan Cui > Sent: Wednesday, November 1, 2017 1:31 PM > To: Bjorn Helgaas <bhelgaas@...gle.com>; linux-pci@...r.kernel.org; Jake > Oshins <jakeo@...rosoft.com>; KY Srinivasan <kys@...rosoft.com>; > Stephen Hemminger <sthemmin@...rosoft.com> > Cc: devel@...uxdriverproject.org; linux-kernel@...r.kernel.org; Haiyang > Zhang <haiyangz@...rosoft.com>; Jork Loeser > <Jork.Loeser@...rosoft.com>; Chris Valean (Cloudbase Solutions SRL) <v- > chvale@...rosoft.com>; Adrian Suhov (Cloudbase Solutions SRL) <v- > adsuho@...rosoft.com>; Simon Xiao <sixiao@...rosoft.com>; 'Eyal > Mizrachi' <eyalmi@...lanox.com>; Jack Morgenstein > <jackm@...lanox.com>; Armen Guezalian <armeng@...lanox.com>; Firas > Mahameed <firas@...lanox.com>; Tziporet Koren > <tziporet@...lanox.com>; Daniel Jurgens <danielj@...lanox.com> > Subject: [PATCH] PCI: hv: use effective affinity mask > > > The effective_affinity_mask is always set when an interrupt is assigned in > __assign_irq_vector() -> apic->cpu_mask_to_apicid(), e.g. for struct apic > apic_physflat: -> default_cpu_mask_to_apicid() -> > irq_data_update_effective_affinity(), but it looks d->common->affinity > remains all-1's before the user space or the kernel changes it later. > > In the early allocation/initialization phase of an irq, we should use the > effective_affinity_mask, otherwise Hyper-V may not deliver the interrupt to > the expected cpu. Without the patch, if we assign 7 Mellanox ConnectX-3 > VFs to a 32-vCPU VM, one of the VFs may fail to receive interrupts. > > Signed-off-by: Dexuan Cui <decui@...rosoft.com> > Cc: Jake Oshins <jakeo@...rosoft.com> > Cc: Jork Loeser <jloeser@...rosoft.com> > Cc: Stephen Hemminger <sthemmin@...rosoft.com> > Cc: K. Y. Srinivasan <kys@...rosoft.com> > --- > > Please consider this for v4.14, if it's not too late. > > drivers/pci/host/pci-hyperv.c | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c > index 5ccb47d..8b5f66d 100644 > --- a/drivers/pci/host/pci-hyperv.c > +++ b/drivers/pci/host/pci-hyperv.c > @@ -879,7 +879,7 @@ static void hv_irq_unmask(struct irq_data *data) > int cpu; > u64 res; > > - dest = irq_data_get_affinity_mask(data); > + dest = irq_data_get_effective_affinity_mask(data); > pdev = msi_desc_to_pci_dev(msi_desc); > pbus = pdev->bus; > hbus = container_of(pbus->sysdata, struct hv_pcibus_device, > sysdata); @@ -1042,6 +1042,7 @@ static void hv_compose_msi_msg(struct > irq_data *data, struct msi_msg *msg) > struct hv_pci_dev *hpdev; > struct pci_bus *pbus; > struct pci_dev *pdev; > + struct cpumask *dest; > struct compose_comp_ctxt comp; > struct tran_int_desc *int_desc; > struct { > @@ -1056,6 +1057,7 @@ static void hv_compose_msi_msg(struct irq_data > *data, struct msi_msg *msg) > int ret; > > pdev = msi_desc_to_pci_dev(irq_data_get_msi_desc(data)); > + dest = irq_data_get_effective_affinity_mask(data); > pbus = pdev->bus; > hbus = container_of(pbus->sysdata, struct hv_pcibus_device, > sysdata); > hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(pdev->devfn)); > @@ -1081,14 +1083,14 @@ static void hv_compose_msi_msg(struct irq_data > *data, struct msi_msg *msg) > switch (pci_protocol_version) { > case PCI_PROTOCOL_VERSION_1_1: > size = hv_compose_msi_req_v1(&ctxt.int_pkts.v1, > - irq_data_get_affinity_mask(data), > + dest, > hpdev->desc.win_slot.slot, > cfg->vector); > break; > > case PCI_PROTOCOL_VERSION_1_2: > size = hv_compose_msi_req_v2(&ctxt.int_pkts.v2, > - irq_data_get_affinity_mask(data), > + dest, > hpdev->desc.win_slot.slot, > cfg->vector); > break; > -- > 2.7.4 Signed-off-by: Jake Oshins <jakeo@...rosoft.com>
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