Re: [PATCH v2 1/3] net/virtio: register/unregister intr handler on start/stop

[Luca Boccassi <bluca@debian.org>]

On Wed, 2018-09-19 at 13:57 +0100, Luca Boccassi wrote:
> Register and unregister the virtio interrupt handler when the device
> is
> started and stopped. This allows a virtio device to be hotplugged or
> unplugged.
> 
> Fixes: c1f86306a026 ("virtio: add new driver")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Brian Russell <brussell@brocade.com>
> Signed-off-by: Luca Boccassi <bluca@debian.org>
> ---
>  drivers/net/virtio/virtio_ethdev.c | 26 +++++++++++++++-----------
>  1 file changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_ethdev.c
> b/drivers/net/virtio/virtio_ethdev.c
> index b81df0a99f..adc6a30a32 100644
> --- a/drivers/net/virtio/virtio_ethdev.c
> +++ b/drivers/net/virtio/virtio_ethdev.c
> @@ -1679,11 +1679,6 @@ eth_virtio_dev_init(struct rte_eth_dev
> *eth_dev)
>  	if (ret < 0)
>  		goto out;
>  
> -	/* Setup interrupt callback  */
> -	if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
> -		rte_intr_callback_register(eth_dev->intr_handle,
> -			virtio_interrupt_handler, eth_dev);
> -
>  	return 0;
>  
>  out:
> @@ -1709,11 +1704,6 @@ eth_virtio_dev_uninit(struct rte_eth_dev
> *eth_dev)
>  	rte_free(eth_dev->data->mac_addrs);
>  	eth_dev->data->mac_addrs = NULL;
>  
> -	/* reset interrupt callback  */
> -	if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
> -		rte_intr_callback_unregister(eth_dev->intr_handle,
> -						virtio_interrupt_han
> dler,
> -						eth_dev);
>  	if (eth_dev->device)
>  		rte_pci_unmap_device(RTE_ETH_DEV_TO_PCI(eth_dev));
>  
> @@ -1972,6 +1962,12 @@ virtio_dev_start(struct rte_eth_dev *dev)
>  	    dev->data->dev_conf.intr_conf.rxq) {
>  		virtio_intr_disable(dev);
>  
> +		/* Setup interrupt callback  */
> +		if (dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
> +			rte_intr_callback_register(dev->intr_handle,
> +						   virtio_interrupt_
> handler,
> +						   dev);
> +
>  		if (virtio_intr_enable(dev) < 0) {
>  			PMD_DRV_LOG(ERR, "interrupt enable failed");
>  			return -EIO;
> @@ -2081,9 +2077,17 @@ virtio_dev_stop(struct rte_eth_dev *dev)
>  	PMD_INIT_LOG(DEBUG, "stop");
>  
>  	rte_spinlock_lock(&hw->state_lock);
> -	if (intr_conf->lsc || intr_conf->rxq)
> +	if (intr_conf->lsc || intr_conf->rxq) {
>  		virtio_intr_disable(dev);
>  
> +		/* Reset interrupt callback  */
> +		if (dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC) {
> +			rte_intr_callback_unregister(dev-
> >intr_handle,
> +						     virtio_interrup
> t_handler,
> +						     dev);
> +		}
> +	}
> +
>  	hw->started = 0;
>  	memset(&link, 0, sizeof(link));
>  	rte_eth_linkstatus_set(dev, &link);

Hi, any chance the virtio and eal patches in this series could get a
review? Thanks!

-- 
Kind regards,
Luca Boccassi