Re: [dpdk-dev] [RFC] net/null: add empty promiscuous mode functions

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 10/16/2019 4:46 PM, Ciara Power wrote:
> Adding promiscuous functions prevents sample applications failing when run
> on this virtual PMD. The sample applications call promiscuous functions,
> and fail if this function call returns an error, which occurs when the
> virtual PMD does not support the promiscuous function being called. 
> 
> This change will be implemented for all virtual PMDs that currently do not
> have existing promiscuous functions. Multicast functions will also be
> added for virtual PMDs to prevent sample application breakages here also.

+Andrew

With the some ethdev APIs returning error code, some sample applications stop
working with virtual interfaces,

We can,
1- update sample applications to ignore the errors
2- Add dummy dev_ops support to (almost all) virtual PMDs (what this RFC suggests)

(1) puts us back to before the ethdev APIs updated status, and this may be wrong
for the physical devices case, so I am for this RFC.

Only perhaps we can have some common empty function and keep assigning that one
to reduce the dummy code, what do you think?


> 
> Signed-off-by: Ciara Power <ciara.power@intel.com>
> ---
>  drivers/net/null/rte_eth_null.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/net/null/rte_eth_null.c b/drivers/net/null/rte_eth_null.c
> index e2ff41a22..b8472a0cf 100644
> --- a/drivers/net/null/rte_eth_null.c
> +++ b/drivers/net/null/rte_eth_null.c
> @@ -441,11 +441,25 @@ eth_mac_address_set(__rte_unused struct rte_eth_dev *dev,
>  	return 0;
>  }
>  
> +static int
> +eth_dev_promiscuous_enable(__rte_unused struct rte_eth_dev *dev)
> +{
> +	return 0;
> +}
> +
> +static int
> +eth_dev_promiscuous_disable(__rte_unused struct rte_eth_dev *dev)
> +{
> +	return 0;
> +}
> +
>  static const struct eth_dev_ops ops = {
>  	.dev_start = eth_dev_start,
>  	.dev_stop = eth_dev_stop,
>  	.dev_configure = eth_dev_configure,
>  	.dev_infos_get = eth_dev_info,
> +	.promiscuous_enable = eth_dev_promiscuous_enable,
> +	.promiscuous_disable = eth_dev_promiscuous_disable,
>  	.rx_queue_setup = eth_rx_queue_setup,
>  	.tx_queue_setup = eth_tx_queue_setup,
>  	.rx_queue_release = eth_queue_release,
>