netdev - Re: [PATCH V2 0/4] vDPA/ifcvf: implement shared IRQ feature

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Date:   Tue, 25 Jan 2022 14:32:43 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Zhu Lingshan <lingshan.zhu@...el.com>
Cc:     jasowang@...hat.com, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH V2 0/4] vDPA/ifcvf: implement shared IRQ feature

On Tue, Jan 25, 2022 at 05:17:40PM +0800, Zhu Lingshan wrote:
> It has been observed that on some platforms/devices, there may
> not be enough MSI vectors for virtqueues and the config change.
> Under such circumstances, the interrupt sources of a device
> have to share vectors/IRQs.
> 
> This series implemented a shared IRQ feature for ifcvf.

Which configurations did you test with this, and what were
the results? Given patch 3 is broken ...


> Please help review.
> 
> Changes from V1:
> (1) Enable config interrupt when only one vector is allocated(Michael)
> (2) Clean vectors/IRQs if failed to request config interrupt
> since config interrupt is a must(Michael)
> (3) Keep local vdpa_ops, disable irq_bypass by setting IRQ = -EINVAL
> for shared IRQ case(Michael)
> (4) Improvements on error messages(Michael)
> (5) Squash functions implementation patches to the callers(Michael)
> 
> Zhu Lingshan (4):
>   vDPA/ifcvf: implement IO read/write helpers in the header file
>   vDPA/ifcvf: implement device MSIX vector allocator
>   vhost_vdpa: don't setup irq offloading when irq_num < 0
>   vDPA/ifcvf: implement shared IRQ feature
> 
>  drivers/vdpa/ifcvf/ifcvf_base.c |  67 +++------
>  drivers/vdpa/ifcvf/ifcvf_base.h |  60 +++++++-
>  drivers/vdpa/ifcvf/ifcvf_main.c | 254 ++++++++++++++++++++++++++++----
>  drivers/vhost/vdpa.c            |   3 +
>  4 files changed, 305 insertions(+), 79 deletions(-)
> 
> -- 
> 2.27.0