Hi, I've also tested this and it's working good. Kernels tested: - next-20171109 on top of Ubuntu 16.04 - MSFT kernel - 4.14.0-rc5 with patch applied - on top of RHEL 7.3 Adrian -----Original Message----- From: Bjorn Helgaas [mailto:helgaas@xxxxxxxxxx] Sent: Wednesday, November 8, 2017 3:08 AM To: Dexuan Cui <decui@xxxxxxxxxxxxx> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>; linux-pci@xxxxxxxxxxxxxxx; Jake Oshins <jakeo@xxxxxxxxxxxxx>; KY Srinivasan <kys@xxxxxxxxxxxxx>; Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>; devel@xxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>; Jork Loeser <Jork.Loeser@xxxxxxxxxxxxx>; Chris Valean (Cloudbase Solutions SRL) <v-chvale@xxxxxxxxxxxxx>; Adrian Suhov (Cloudbase Solutions SRL) <v-adsuho@xxxxxxxxxxxxx>; Simon Xiao <sixiao@xxxxxxxxxxxxx>; 'Eyal Mizrachi' <eyalmi@xxxxxxxxxxxx>; Jack Morgenstein <jackm@xxxxxxxxxxxx>; Armen Guezalian <armeng@xxxxxxxxxxxx>; Firas Mahameed <firas@xxxxxxxxxxxx>; Tziporet Koren <tziporet@xxxxxxxxxxxx>; Daniel Jurgens <danielj@xxxxxxxxxxxx> Subject: Re: [PATCH] PCI: hv: use effective affinity mask On Wed, Nov 01, 2017 at 08:30:53PM +0000, Dexuan Cui wrote: > > 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@xxxxxxxxxxxxx> > Cc: Jake Oshins <jakeo@xxxxxxxxxxxxx> > Cc: Jork Loeser <jloeser@xxxxxxxxxxxxx> > Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx> > Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > --- > > Please consider this for v4.14, if it's not too late. What would be the rationale for putting it in v4.14? After the merge window, I usually only merge fixes for problems introduced during the merge window, or for serious regressions. I can't tell if this fits into that or not. > 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 >
