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SubjectRe: [PATCH] PCI: hv: use effective affinity mask
On Fri, Nov 10, 2017 at 08:55:07AM +0000, Adrian Suhov (Cloudbase Solutions SRL) wrote:
> 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

Thanks, Adrian. I added this to the patch:

Tested-by: Adrian Suhov <v-adsuho@microsoft.com>

> -----Original Message-----
> From: Bjorn Helgaas [mailto:helgaas@kernel.org]
> Sent: Wednesday, November 8, 2017 3:08 AM
> To: Dexuan Cui <decui@microsoft.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>; linux-pci@vger.kernel.org; Jake Oshins <jakeo@microsoft.com>; KY Srinivasan <kys@microsoft.com>; Stephen Hemminger <sthemmin@microsoft.com>; devel@linuxdriverproject.org; linux-kernel@vger.kernel.org; Haiyang Zhang <haiyangz@microsoft.com>; Jork Loeser <Jork.Loeser@microsoft.com>; Chris Valean (Cloudbase Solutions SRL) <v-chvale@microsoft.com>; Adrian Suhov (Cloudbase Solutions SRL) <v-adsuho@microsoft.com>; Simon Xiao <sixiao@microsoft.com>; 'Eyal Mizrachi' <eyalmi@mellanox.com>; Jack Morgenstein <jackm@mellanox.com>; Armen Guezalian <armeng@mellanox.com>; Firas Mahameed <firas@mellanox.com>; Tziporet Koren <tziporet@mellanox.com>; Daniel Jurgens <danielj@mellanox.com>
> 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@microsoft.com>
> > Cc: Jake Oshins <jakeo@microsoft.com>
> > Cc: Jork Loeser <jloeser@microsoft.com>
> > Cc: Stephen Hemminger <sthemmin@microsoft.com>
> > Cc: K. Y. Srinivasan <kys@microsoft.com>
> > ---
> >
> > 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
> >

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