netdev - Re: [PATCH 5/6] vDPA: answer num of queue pairs = 1 to userspace when VIRTIO_NET_F

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Date:   Tue, 7 Jun 2022 16:40:31 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst <mst@...hat.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 5/6] vDPA: answer num of queue pairs = 1 to userspace when
 VIRTIO_NET_F_MQ == 0



On 6/7/2022 2:14 PM, Jason Wang wrote:
> On Mon, Jun 6, 2022 at 4:22 PM Zhu, Lingshan <lingshan.zhu@...el.com> wrote:
>>
>>
>> On 6/2/2022 3:38 PM, Jason Wang wrote:
>>> On Thu, Jun 2, 2022 at 10:48 AM Zhu Lingshan <lingshan.zhu@...el.com> wrote:
>>>> If VIRTIO_NET_F_MQ == 0, the virtio device should have one queue pair,
>>>> so when userspace querying queue pair numbers, it should return mq=1
>>>> than zero
>>> Spec said:
>>>
>>> "max_virtqueue_pairs only exists if VIRTIO_NET_F_MQ is set"
>>>
>>> So we are probably fine.
>> I thinks it is asking how many queue
>> pairs(VDPA_ATTR_DEV_NET_CFG_MAX_VQP), so answering 0 may not be correct.
>>
>> Thanks,
>> Zhu Lingshan
> Please add the result of the userspace vdpa tool before and after this
> patch in the changlog in next version.
sure!
>
> Thanks
>
>>> Thanks
>>>
>>>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>>>> ---
>>>>    drivers/vdpa/vdpa.c | 5 +++--
>>>>    1 file changed, 3 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
>>>> index 030d96bdeed2..50a11ece603e 100644
>>>> --- a/drivers/vdpa/vdpa.c
>>>> +++ b/drivers/vdpa/vdpa.c
>>>> @@ -818,9 +818,10 @@ static int vdpa_dev_net_mq_config_fill(struct vdpa_device *vdev,
>>>>           u16 val_u16;
>>>>
>>>>           if ((features & BIT_ULL(VIRTIO_NET_F_MQ)) == 0)
>>>> -               return 0;
>>>> +               val_u16 = 1;
>>>> +       else
>>>> +               val_u16 = le16_to_cpu((__force __le16)config->max_virtqueue_pairs);
>>>>
>>>> -       val_u16 = le16_to_cpu(config->max_virtqueue_pairs);
>>>>           return nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, val_u16);
>>>>    }
>>>>
>>>> --
>>>> 2.31.1
>>>>