netdev - Re: [PATCH V3 0/6] Conditionally read fields in dev cfg space

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Date:   Thu, 29 Sep 2022 15:46:18 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH V3 0/6] Conditionally read fields in dev cfg space



On 9/29/2022 3:38 PM, Michael S. Tsirkin wrote:
> On Thu, Sep 29, 2022 at 03:23:46PM +0800, Zhu, Lingshan wrote:
>> Hi Michael,
>>
>> Jason starts his vacation this afternoon, and next week is our national
>> holiday.
>> He has acked 3 ~ 6 of this series before, and I have made improvements based
>> on his comments.
>> Do you have any comments on patches 1 and 2?
>
> No, I'll merge for next.
Thanks!
>
>> Thanks,
>> Zhu Lingshan
>> On 9/29/2022 9:45 AM, Zhu Lingshan wrote:
>>> This series intends to read the fields in virtio-net device
>>> configuration space conditionally on the feature bits,
>>> this means:
>>>
>>> MTU exists if VIRTIO_NET_F_MTU is set
>>> MAC exists if VIRTIO_NET_F_NET is set
>>> MQ exists if VIRTIO_NET_F_MQ or VIRTIO_NET_F_RSS is set.
>>>
>>> This series report device features to userspace and invokes
>>> vdpa_config_ops.get_config() rather than
>>> vdpa_get_config_unlocked() to read the device config spcae,
>>> so no races in vdpa_set_features_unlocked()
>>>
>>> Thanks!
>>>
>>> Changes form V2:
>>> remove unnacessary checking for vdev->config->get_status (Jason)
>>>
>>> Changes from V1:
>>> 1)Better comments for VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES,
>>> only in the header file(Jason)
>>> 2)Split original 3/4 into separate patches(Jason)
>>> 3)Check FEATURES_OK for reporting driver features
>>> in vdpa_dev_config_fill (Jason)
>>> 4) Add iproute2 example for reporting device features
>>>
>>> Zhu Lingshan (6):
>>>     vDPA: allow userspace to query features of a vDPA device
>>>     vDPA: only report driver features if FEATURES_OK is set
>>>     vDPA: check VIRTIO_NET_F_RSS for max_virtqueue_paris's presence
>>>     vDPA: check virtio device features to detect MQ
>>>     vDPA: fix spars cast warning in vdpa_dev_net_mq_config_fill
>>>     vDPA: conditionally read MTU and MAC in dev cfg space
>>>
>>>    drivers/vdpa/vdpa.c       | 68 ++++++++++++++++++++++++++++++---------
>>>    include/uapi/linux/vdpa.h |  4 +++
>>>    2 files changed, 56 insertions(+), 16 deletions(-)
>>>