[dpdk-dev] [PATCH 3/5] net/virtio-user: support to report net status
Tan, Jianfeng
jianfeng.tan at intel.com
Wed Mar 29 09:07:28 CEST 2017
On 3/29/2017 2:33 PM, Yuanhan Liu wrote:
> On Mon, Mar 27, 2017 at 07:46:32AM +0000, Tan, Jianfeng wrote:
>>>> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>> b/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>>> index 9777d6b..cc6f557 100644
>>>> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>>> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>>> @@ -176,6 +176,7 @@ virtio_user_start_device(struct virtio_user_dev
>>> *dev, uint8_t portid)
>>>> features &= ~(1ull << VIRTIO_NET_F_MAC);
>>>> /* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to
>>> know */
>>>> features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
>>>> + features &= ~(1ull << VIRTIO_NET_F_STATUS);
>>>> ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES,
>>> &features);
>>>> if (ret < 0)
>>>> goto error;
>>>> diff --git a/drivers/net/virtio/virtio_user_ethdev.c
>>> b/drivers/net/virtio/virtio_user_ethdev.c
>>>> index fa79419..fbdd0a8 100644
>>>> --- a/drivers/net/virtio/virtio_user_ethdev.c
>>>> +++ b/drivers/net/virtio/virtio_user_ethdev.c
>>>> @@ -121,7 +121,8 @@ virtio_user_get_features(struct virtio_hw *hw)
>>>> struct virtio_user_dev *dev = virtio_user_get_dev(hw);
>>>>
>>>> /* unmask feature bits defined in vhost user protocol */
>>>> - return dev->device_features &
>>> VIRTIO_PMD_SUPPORTED_GUEST_FEATURES;
>>>> + return (dev->device_features | (1 << VIRTIO_NET_F_STATUS))
>>>> + & VIRTIO_PMD_SUPPORTED_GUEST_FEATURES;
>>> Why not handle the features at virtio_user_dev_init()?
>> You mean add VIRTIO_NET_F_STATUS when get_features from device? Yes, we could do that there. But we originally add device_features to only record features supported by device.
>>
> Aren't you adding the F_STATUS features to this device?
>
For virtio driver, yes, we are adding F_STATUS feature so the it sees a
device supporting LSC. But for backend driver, we need hide this
feature, it happens when we set_features to the backend driver.
Thanks,
Jianfeng
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