netdev - Re: [PATCH net] sfc: fix error process in efx_ef100_pci_sriov

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Date:   Tue, 29 Nov 2022 08:56:35 +0000
From:   Martin Habets <habetsm.xilinx@...il.com>
To:     Zhengchao Shao <shaozhengchao@...wei.com>
Cc:     netdev@...r.kernel.org, ecree.xilinx@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, pieter.jansen-van-vuuren@....com,
        weiyongjun1@...wei.com, yuehaibing@...wei.com
Subject: Re: [PATCH net] sfc: fix error process in
 efx_ef100_pci_sriov_enable()

On Fri, Nov 25, 2022 at 03:19:58PM +0800, Zhengchao Shao wrote:
> There are two issues in efx_ef100_pci_sriov_enable():
> 1. When it doesn't have MAE Privilege, it doesn't disable pci sriov.
> 2. When creating VF successfully, it should return vf nums instead of 0.

This function returns 0 on success, or an error code. It is the higher level
function ef100_pci_sriov_configure() in ef100.c that returns num_vfs if things
are ok.

Martin

> Compiled test only.
> 
> Fixes: 08135eecd07f ("sfc: add skeleton ef100 VF representors")
> Fixes: 78a9b3c47bef ("sfc: add EF100 VF support via a write to sriov_numvfs")
> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
> ---
>  drivers/net/ethernet/sfc/ef100_sriov.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/sfc/ef100_sriov.c b/drivers/net/ethernet/sfc/ef100_sriov.c
> index 94bdbfcb47e8..adf7fb09940e 100644
> --- a/drivers/net/ethernet/sfc/ef100_sriov.c
> +++ b/drivers/net/ethernet/sfc/ef100_sriov.c
> @@ -25,15 +25,17 @@ static int efx_ef100_pci_sriov_enable(struct efx_nic *efx, int num_vfs)
>  	if (rc)
>  		goto fail1;
>  
> -	if (!nic_data->grp_mae)
> +	if (!nic_data->grp_mae) {
> +		pci_disable_sriov(dev);
>  		return 0;
> +	}
>  
>  	for (i = 0; i < num_vfs; i++) {
>  		rc = efx_ef100_vfrep_create(efx, i);
>  		if (rc)
>  			goto fail2;
>  	}
> -	return 0;
> +	return num_vfs;
>  
>  fail2:
>  	list_for_each_entry_safe(efv, next, &efx->vf_reps, list)
> -- 
> 2.17.1