netdev - Re: [PATCH V3 0/4] vDPA/ifcvf: implement shared IRQ feature

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Date:   Thu, 27 Jan 2022 12:31:55 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     jasowang@...hat.com, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH V3 0/4] vDPA/ifcvf: implement shared IRQ feature



On 1/26/2022 10:14 PM, Michael S. Tsirkin wrote:
> On Wed, Jan 26, 2022 at 08:49:08PM +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.
>>
>> Please help review.
> Given the history, can you please report which tests
> were performed with this patchset? Which configs tested?
> Thanks?
Hi Michael,

It is ping and netperf tests, and I have set nvectors = 1 and 2 in
ifcvf_request_irq(), after ifcvf_alloc_vectors(),
to hard coded the number of the allocate vectors.

Thanks,
Zhu Lingshan
>
>> Changes from V2:
>> (1) Fix misuse of nvectors(in ifcvf_alloc_vectors return value)(Michael)
>> (2) Fix misuse of irq = get_vq_irq() in setup irqbypass(Michael)
>> (3) Coding style improvements(Michael)
>> (4) Better naming of device shared irq/shared vq irq
>>
>> 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 | 260 ++++++++++++++++++++++++++++----
>>   drivers/vhost/vdpa.c            |   4 +
>>   4 files changed, 312 insertions(+), 79 deletions(-)
>>
>> -- 
>> 2.27.0