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

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Date:   Thu, 10 Oct 2019 22:15:44 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     Jiri Pirko <jiri@...nulli.us>, David Miller <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        John Linville <linville@...driver.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Johannes Berg <johannes@...solutions.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v7 12/17] ethtool: provide link settings with
 LINKINFO_GET request

On Thu, Oct 10, 2019 at 05:59:55PM +0200, Jiri Pirko wrote:
> Wed, Oct 09, 2019 at 10:59:37PM CEST, mkubecek@...e.cz wrote:
> 
> [...]
> 
> >+/* prepare_data() handler */
> 
> Not sure how valuable are comments like this...

I'll drop them.

> >+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.

Good point.

> >+	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?

OK

> 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?

Yes, there are some which do not call any ethtool_ops callbacks, e.g.
netdev features (ethtool -k / -K).

> >+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.

OK

Michal