netdev - Re: [PATCH net-next] ethtool: fix incorrect tx-checksumming settings reporting

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Message-ID: <20200324133412.GO31519@unicorn.suse.cz>
Date:   Tue, 24 Mar 2020 14:34:12 +0100
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     Vladyslav Tarasiuk <vladyslavt@...lanox.com>, davem@...emloft.net,
        maximmi@...lanox.com, moshe@...lanox.com
Subject: Re: [PATCH net-next] ethtool: fix incorrect tx-checksumming settings
 reporting

On Tue, Mar 24, 2020 at 01:57:08PM +0200, Vladyslav Tarasiuk wrote:
> Currently, ethtool feature mask for checksum command is ORed with
> NETIF_F_FCOE_CRC_BIT, which is bit's position number, instead of the
> actual feature bit - NETIF_F_FCOE_CRC.
> 
> The invalid bitmask here might affect unrelated features when toggling
> TX checksumming. For example, TX checksumming is always mistakenly
> reported as enabled on the netdevs tested (mlx5, virtio_net).
> 
> Fixes: f70bb06563ed ("ethtool: update mapping of features to legacy ioctl requests")
> Signed-off-by: Vladyslav Tarasiuk <vladyslavt@...lanox.com>
> ---

Stupid mistake... sorry for that. I even realized now how I managed to
miss it when I tested the patch: out of habit, I ran patched ethtool
which used netlink so that it did not call this function at all and
showed expected results. :-(

Reviewed-by: Michal Kubecek <mkubecek@...e.cz>

>  net/ethtool/ioctl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
> index 3852a58d7f95..10d929abdf6a 100644
> --- a/net/ethtool/ioctl.c
> +++ b/net/ethtool/ioctl.c
> @@ -196,7 +196,7 @@ static netdev_features_t ethtool_get_feature_mask(u32 eth_cmd)
>  	switch (eth_cmd) {
>  	case ETHTOOL_GTXCSUM:
>  	case ETHTOOL_STXCSUM:
> -		return NETIF_F_CSUM_MASK | NETIF_F_FCOE_CRC_BIT |
> +		return NETIF_F_CSUM_MASK | NETIF_F_FCOE_CRC |
>  		       NETIF_F_SCTP_CRC;
>  	case ETHTOOL_GRXCSUM:
>  	case ETHTOOL_SRXCSUM:
> -- 
> 2.17.1
>