[dpdk-stable] [PATCH] net/af_xdp: do not attempt probe for secondary processes

[Ferruh Yigit]

On 9/30/2021 2:46 PM, Ciara Loftus wrote:
> Since the AF_XDP PMD does not work for secondary processes as reported
> in Bugzilla 805, check for the process type at the beginning of probe
> and return ENOTSUP if the process type is secondary.
> 

Hi Ciara,

'Do not attempt probe for secondary process' practically means disabling the
secondary process support for af_xdp, what to you think highlight this in
the patch title?

Also can you please add a brief release notes update, for the possible
af_xdp secondary process users.

And would you mind putting the discussed plan to the commit log to record it,
to support the secondary process fully in 22.02 etc..

Thanks,
ferruh

> Bugzilla ID: 805
> Fixes: f1debd77efaf ("net/af_xdp: introduce AF_XDP PMD")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
> Reported-by: Stephen Hemminger <stephen at networkplumber.org>
> ---
>   drivers/net/af_xdp/rte_eth_af_xdp.c | 15 +++++----------
>   1 file changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
> index 9bea0a895a..d61cb0aa7c 100644
> --- a/drivers/net/af_xdp/rte_eth_af_xdp.c
> +++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
> @@ -1790,16 +1790,11 @@ rte_pmd_af_xdp_probe(struct rte_vdev_device *dev)
>   		rte_vdev_device_name(dev));
>   
>   	name = rte_vdev_device_name(dev);
> -	if (rte_eal_process_type() == RTE_PROC_SECONDARY &&
> -		strlen(rte_vdev_device_args(dev)) == 0) {
> -		eth_dev = rte_eth_dev_attach_secondary(name);
> -		if (eth_dev == NULL) {
> -			AF_XDP_LOG(ERR, "Failed to probe %s\n", name);
> -			return -EINVAL;
> -		}
> -		eth_dev->dev_ops = &ops;
> -		rte_eth_dev_probing_finish(eth_dev);
> -		return 0;
> +	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
> +		AF_XDP_LOG(ERR, "Failed to probe %s. "
> +				"AF_XDP PMD does not support secondary processes.\n",
> +				name);
> +		return -ENOTSUP;
>   	}
>   
>   	kvlist = rte_kvargs_parse(rte_vdev_device_args(dev), valid_arguments);
>