[dpdk-dev] [PATCH v7 3/6] igb_uio: fix MSI-X IRQ assignment with new IRQ function

[Stephen Hemminger]

Why not have an ongoing sliding window policy? So each release it is set

On Sep 12, 2017 1:14 AM, "Bruce Richardson" <bruce.richardson at intel.com>
wrote:

> On Mon, Sep 11, 2017 at 03:04:01PM -0700, Stephen Hemminger wrote:
> > I wonder if it is time to move the bar forward to oldest LTS which is
> > 3.2.92
> >
>
> That seems reasonable. Probably best to do a deprecation notice for it
> in 17.11 and move the bar in 18.02.
>
> /Bruce
>
> >
> > On Sep 11, 2017 10:56 AM, "Ferruh Yigit" <ferruh.yigit at intel.com> wrote:
> >
> > > On 9/5/2017 1:04 PM, Markus Theil wrote:
> > > > The patch which introduced the usage of pci_alloc_irq_vectors
> > > > came after the patch which switched to non-threaded ISR (f0d1896fa1),
> > > > but did not use non-threaded ISR, if pci_alloc_irq_vectors
> > > > is used.
> > > >
> > > > Fixes: 99bb58f3adc7 ("igb_uio: switch to new irq function for
> > > > MSI-X")
> > > > Cc: nicolas.dichtel at 6wind.com
> > > >
> > > > Signed-off-by: Markus Theil <markus.theil at tu-ilmenau.de>
> > > > ---
> > > >  lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 1 +
> > > >  1 file changed, 1 insertion(+)
> > > >
> > > > diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
> > > b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
> > > > index 93bb71d..6885e72 100644
> > > > --- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
> > > > +++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
> > > > @@ -331,6 +331,7 @@ igbuio_pci_enable_interrupts(struct
> rte_uio_pci_dev
> > > *udev)
> > > >  #else
> > > >               if (pci_alloc_irq_vectors(udev->pdev, 1, 1,
> PCI_IRQ_MSIX)
> > > == 1) {
> > > >                       dev_dbg(&udev->pdev->dev, "using MSI-X");
> > > > +                     udev->info.irq_flags = IRQF_NO_THREAD;
> > >
> > > IRQF_NO_THREAD seems has been introduced in 2.6.39, so using this flag
> > > causing build error for kernel versions < 2.6.39.
> > >
> > > btw, the flag is already in use, so issue is not related to this patch.
> > >
> > > In DPDK documentation supported Linux kernel version is >= 2.6.34 [1].
> > >
> > > We should either increase supported version to 2.6.39, or update
> igb_uio
> > > code.
> > >
> > > I am for increasing minimum supported kernel version to 2.6.39, any
> > > objection / comment?
> > >
> > > 2.6.39 released on May 2011
> > > 2.6.34 released on May 2010
> > >
> > >
> > > [1]
> > > http://dpdk.org/doc/guides/linux_gsg/sys_reqs.html#system-software
> > >
> > > >                       udev->info.irq = pci_irq_vector(udev->pdev, 0);
> > > >                       udev->mode = RTE_INTR_MODE_MSIX;
> > > >                       break;
> > > >
> > >
> > >
>