netdev - Re: [PATCH net-next] vxlan_core: delete unnecessary condition

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Message-ID: <c568979a-d3da-c577-840f-ca6689f7400f@blackwall.org>
Date:   Mon, 7 Mar 2022 15:05:49 +0200
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Nikolay Aleksandrov <nikolay@...dia.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, Roopa Prabhu <roopa@...dia.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net-next] vxlan_core: delete unnecessary condition

On 07/03/2022 14:57, Dan Carpenter wrote:
> The previous check handled the "if (!nh)" condition so we know "nh"
> is non-NULL here.  Delete the check and pull the code in one tab.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> This not a bug so a Fixes tag is innappropriate, however for reviewers
> this was introduced in commit 4095e0e1328a ("drivers: vxlan: vnifilter:
> per vni stats")

No, it was not introduced by that commit.
It was introduced by commit:
 1274e1cc4226 ("vxlan: ecmp support for mac fdb entries")

> ---
>  drivers/net/vxlan/vxlan_core.c | 54 ++++++++++++++++------------------
>  1 file changed, 26 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
> index 4ab09dd5a32a..795f438940ee 100644
> --- a/drivers/net/vxlan/vxlan_core.c
> +++ b/drivers/net/vxlan/vxlan_core.c
> @@ -811,37 +811,35 @@ static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
>  		goto err_inval;
>  	}
>  
> -	if (nh) {
> -		if (!nexthop_get(nh)) {
> -			NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
> -			nh = NULL;
> -			goto err_inval;
> -		}
> -		if (!nexthop_is_fdb(nh)) {
> -			NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
> -			goto err_inval;
> -		}
> +	if (!nexthop_get(nh)) {
> +		NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
> +		nh = NULL;
> +		goto err_inval;
> +	}
> +	if (!nexthop_is_fdb(nh)) {
> +		NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
> +		goto err_inval;
> +	}
>  
> -		if (!nexthop_is_multipath(nh)) {
> -			NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
> +	if (!nexthop_is_multipath(nh)) {
> +		NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
> +		goto err_inval;
> +	}
> +
> +	/* check nexthop group family */
> +	switch (vxlan->default_dst.remote_ip.sa.sa_family) {
> +	case AF_INET:
> +		if (!nexthop_has_v4(nh)) {
> +			err = -EAFNOSUPPORT;
> +			NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
>  			goto err_inval;
>  		}
> -
> -		/* check nexthop group family */
> -		switch (vxlan->default_dst.remote_ip.sa.sa_family) {
> -		case AF_INET:
> -			if (!nexthop_has_v4(nh)) {
> -				err = -EAFNOSUPPORT;
> -				NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
> -				goto err_inval;
> -			}
> -			break;
> -		case AF_INET6:
> -			if (nexthop_has_v4(nh)) {
> -				err = -EAFNOSUPPORT;
> -				NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
> -				goto err_inval;
> -			}
> +		break;
> +	case AF_INET6:
> +		if (nexthop_has_v4(nh)) {
> +			err = -EAFNOSUPPORT;
> +			NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
> +			goto err_inval;
>  		}
>  	}
>