RE: [PATCH v2] net/iavf: initialize large VF setting at startup

["Xu, Ting" <ting.xu@intel.com>]

> -----Original Message-----
> From: Ghalem Boudour <ghalem.boudour@6wind.com>
> Sent: Thursday, February 10, 2022 6:49 PM
> To: Wu, Jingjing <jingjing.wu@intel.com>; Xing, Beilei <beilei.xing@intel.com>
> Cc: dev@dpdk.org; Xu, Ting <ting.xu@intel.com>; Ghalem Boudour
> <ghalem.boudour@6wind.com>; Thibaut Collet <thibaut.collet@6wind.com>;
> Olivier Matz <olivier.matz@6wind.com>
> Subject: [PATCH v2] net/iavf: initialize large VF setting at startup
> 
> lv_enabled is used to remember if large VF setting is configured, but its value
> is not initialized at startup. This can lead to a different configuration
> regarding the initial configuration of the PF.
> For example, a first start is done with 8 rx and 8 tx queues. Large VF is not
> needed and reta size is 64.
> A second start is done with 20 rx and tx queues. Large VF is required and reta
> size is 256.
> A third start is done with 2 rx and tx queues. Large VF is not needed but reta
> size is 256 as the PF has been configured during the second start.
> 
> In order to have a consistent behavior regarding reta size whatever the
> configuration of the PF (may be changed by a previous boot) the lv_enabled
> must be set properly at the init phase.
> 
> Signed-off-by: Ghalem Boudour <ghalem.boudour@6wind.com>
> Signed-off-by: Thibaut Collet <thibaut.collet@6wind.com>
> Reviewed-by: Olivier Matz <olivier.matz@6wind.com>
> ---
> v2:
> * Enable large VF at initialization independently of rss configuration
> ---
>  drivers/net/iavf/iavf_ethdev.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
> index 79397f15e54f..d6190ac24ac6 100644
> --- a/drivers/net/iavf/iavf_ethdev.c
> +++ b/drivers/net/iavf/iavf_ethdev.c
> @@ -2278,6 +2278,9 @@ iavf_init_vf(struct rte_eth_dev *dev)
>  		}
>  	}
> 
> +	if (vf->vsi_res->num_queue_pairs > IAVF_MAX_NUM_QUEUES_DFLT)
> +		vf->lv_enabled = true;
> +
>  	if (vf->vf_res->vf_cap_flags &
> VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC) {
>  		if (iavf_get_supported_rxdid(adapter) != 0) {
>  			PMD_INIT_LOG(ERR, "failed to do get supported
> rxdid");
> --
> 2.30.2

Acked-by: Ting Xu <ting.xu@intel.com>