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SubjectRe: [RFC PATCH net-next v3 15/21] ethtool: provide link settings and link modes in GET_SETTINGS request
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On 2/18/2019 10:22 AM, Michal Kubecek wrote:
> Implement GET_SETTINGS netlink request to get link settings and link mode
> information provided by ETHTOOL_GLINKSETTINGS ioctl command.
>
> The information is divided into two parts: supported, advertised and peer
> advertised link modes when ETH_SETTINGS_IM_LINKMODES flag is set in the
> request and other settings when ETH_SETTINGS_IM_LINKINFO is set.
>
> Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
> ---

[snip]

> +#define ETH_SETTINGS_IM_LINKINFO 0x01
> +#define ETH_SETTINGS_IM_LINKMODES 0x02
> +
> +#define ETH_SETTINGS_IM_ALL 0x03

You could define ETH_SETTINGS_IM_ALL as:

#define ETH_SETTING_IM_ALL \
(ETH_SETTINGS_IM_LINKINFO |
ETH_SETTINGS_IM_LINMODES)

that would scale better IMHO, especially given that you have to keep
bumping that mask with new bits in subsequent patches.

[snip]

> + if (tb[ETHA_SETTINGS_INFOMASK])
> + req_info->req_mask = nla_get_u32(tb[ETHA_SETTINGS_INFOMASK]);
> + if (tb[ETHA_SETTINGS_COMPACT])
> + req_info->compact = true;
> + if (req_info->req_mask == 0)
> + req_info->req_mask = ETH_SETTINGS_IM_ALL;

What if userland is newer than the kernel and specifies a req_mask with
bits set that you don't support? Should not you always do an &
ETH_SETTINGS_IM_ALL here?

[snip]
--
Florian

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