Re: [PATCH v3 3/5] misc: pci_endpoint_test: Fix irq_type to convey the correct type

[Manivannan Sadhasivam]

On Mon, Feb 17, 2025 at 08:26:44PM +0900, Kunihiko Hayashi wrote:
> Hi Manivannan,
> 
> On 2025/02/15 2:25, Manivannan Sadhasivam wrote:
> > On Mon, Feb 10, 2025 at 04:58:10PM +0900, Kunihiko Hayashi wrote:
> > > There are two variables that indicate the interrupt type to be used
> > > in the next test execution, "irq_type" as global and test->irq_type.
> > > 
> > > The global is referenced from pci_endpoint_test_get_irq() to preserve
> > > the current type for ioctl(PCITEST_GET_IRQTYPE).
> > > 
> > > The type set in this function isn't reflected in the global "irq_type",
> > > so ioctl(PCITEST_GET_IRQTYPE) returns the previous type.
> > > As a result, the wrong type will be displayed in "pcitest" as follows:
> > > 
> > >      # pcitest -i 0
> > >      SET IRQ TYPE TO LEGACY:         OKAY
> > >      # pcitest -I
> > >      GET IRQ TYPE:           MSI
> > > 
> > 
> > Could you please post the failure with kselftest that got merged into
> > v6.14-rc1?
> 
> The kselftest doesn't call GET_IRQTYPE, so current kselftest doesn't fail.
> 
> If necessary, I can add GET_IRQTYPE test after SET_IRQTYPE of each
> interrupt test prior to this patch.
> 
>         pci_ep_ioctl(PCITEST_SET_IRQTYPE, 0);
>         ASSERT_EQ(0, ret) TH_LOG("Can't set Legacy IRQ type");
> 
> +       pci_ep_ioctl(PCITEST_GET_IRQTYPE, 0);
> +       ASSERT_EQ(0, ret) TH_LOG("Can't get Legacy IRQ type");
> 

Sure.

> However, pci_ep_ioctl() returns zero if OK, the return value should be
> changed to the actual return value.
> 
>  #define pci_ep_ioctl(cmd, arg)                 \
>  ({                                             \
>         ret = ioctl(self->fd, cmd, arg);        \
> -       ret = ret < 0 ? -errno : 0;             \
> +       ret = ret < 0 ? -errno : ret;           \
>  })
> 

Ok.

> Before applying the patch, this test fails.
> 
> #  RUN           pci_ep_basic.LEGACY_IRQ_TEST ...
> # pci_endpoint_test.c:104:LEGACY_IRQ_TEST:Expected 0 (0) == ret (1)
> # pci_endpoint_test.c:104:LEGACY_IRQ_TEST:Can't get Legacy IRQ type
> # LEGACY_IRQ_TEST: Test terminated by assertion
> #          FAIL  pci_ep_basic.LEGACY_IRQ_TEST
> 

Looks good to me.

- Mani

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