Re: [PATCH net-next v7 12/17] ethtool: provide link settings with LINKINFO_GET request

Jiri Pirko
2019-10-10T16:00:00Z

Wed, Oct 09, 2019 at 10:59:37PM CEST, mkubecek@suse.cz wrote:

[...]

>+/* prepare_data() handler */

Not sure how valuable are comments like this...

>+static int linkinfo_prepare(const struct ethnl_req_info *req_base,
>+ struct ethnl_reply_data *reply_base,
>+ struct genl_info *info)
>+{
>+ struct linkinfo_reply_data *data =
>+ container_of(reply_base, struct linkinfo_reply_data, base);

A helper would be nice for this. For req_info too.

>+ struct net_device *dev = reply_base->dev;
>+ int ret;
>+
>+ data->lsettings = &data->ksettings.base;
>+
>+ ret = ethnl_before_ops(dev);

"before_ops"/"after_ops" sounds odd. Maybe:
ethnl_ops_begin
ethnl_ops_complete

To me in-line with ethtool_ops names?

I guess you don't want the caller (ethnl_get_doit/ethnl_get_dumpit)
to call this because it might not be needed down in prepare_data()
callback, right?

>+ if (ret < 0)
>+ return ret;
>+ ret = __ethtool_get_link_ksettings(dev, &data->ksettings);
>+ if (ret < 0 && info)
>+ GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
>+ ethnl_after_ops(dev);
>+
>+ return ret;
>+}

[...]

>+const struct get_request_ops linkinfo_request_ops = {
>+ .request_cmd = ETHTOOL_MSG_LINKINFO_GET,
>+ .reply_cmd = ETHTOOL_MSG_LINKINFO_GET_REPLY,
>+ .hdr_attr = ETHTOOL_A_LINKINFO_HEADER,
>+ .max_attr = ETHTOOL_A_LINKINFO_MAX,
>+ .req_info_size = sizeof(struct linkinfo_req_info),
>+ .reply_data_size = sizeof(struct linkinfo_reply_data),
>+ .request_policy = linkinfo_get_policy,
>+ .all_reqflags = ETHTOOL_RFLAG_LINKINFO_ALL,
>+
>+ .prepare_data = linkinfo_prepare,

Please have the ops with the same name/suffix:
.request_policy = linkinfo_reques_policy,
.prepare_data = linkinfo_prepare_data,
.reply_size = linkinfo_reply_size,
.fill_reply = linkinfo_fill_reply,

Same applies of course to the other patches.

>+ .reply_size = linkinfo_size,
>+ .fill_reply = linkinfo_fill,
>+}; …