Re: [PATCH 2/5] net/virtio-user: add rxq interrupt mode support

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

On Fri, Mar 03, 2017 at 05:56:40PM +0000, Jianfeng Tan wrote:
> Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>

I don't see a single word to explain how this patch works :/

> ---
>  drivers/net/virtio/virtio_ethdev.c               | 17 ++++++++++++++--
>  drivers/net/virtio/virtio_user/virtio_user_dev.c | 25 +++++++++++++++++++++++-
>  drivers/net/virtio/virtio_user/virtio_user_dev.h |  2 +-
>  drivers/net/virtio/virtio_user_ethdev.c          | 12 +++++++++++-
>  4 files changed, 51 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
> index 4dc03b9..5d80d1a 100644
> --- a/drivers/net/virtio/virtio_ethdev.c
> +++ b/drivers/net/virtio/virtio_ethdev.c
> @@ -1264,6 +1264,10 @@ virtio_configure_intr(struct rte_eth_dev *dev)
>  {
>  	struct virtio_hw *hw = dev->data->dev_private;
>  
> +
> +#ifdef RTE_VIRTIO_USER
> +        if (!hw->virtio_user_dev) {
> +#endif

No need to put the #ifdef block here. virtio_user_dev is defined even
when RTE_VIRTIO_USER is not configured.

...

> +	vtpci_reinit_complete(hw);
> +
>  	if (eth_dev->data->dev_conf.intr_conf.rxq) {
>  		if (virtio_configure_intr(eth_dev) < 0) {
>  			PMD_INIT_LOG(ERR, "failed to configure interrupt");
> @@ -1416,8 +1431,6 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t req_features)
>  		}
>  	}
>  
> -	vtpci_reinit_complete(hw);


Hmm, why ...? Such stealthy change definitely need an explanation.
And it's more likely it needs a single patch.

	--yliu