netdev - Re: [PATCH v2 net-next 02/12] net: ethtool: add support for MAC Merge layer

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Date:   Mon, 16 Jan 2023 14:17:25 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     "Somisetty, Pranavi" <pranavi.somisetty@....com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Rui Sousa <rui.sousa@....com>,
        Ferenc Fejes <ferenc.fejes@...csson.com>,
        "Katakam, Harini" <harini.katakam@....com>,
        Colin Foster <colin.foster@...advantage.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH v2 net-next 02/12] net: ethtool: add support for MAC
 Merge layer

On Mon, Jan 16, 2023 at 09:02:55AM +0000, Somisetty, Pranavi wrote:
> Does it make sense to have two separate functions, one to
> enable/disable pmac and tx preemption status and configure additional
> fragment size (both parameters can be configured after negotiating
> with the link partner), and another to modify the verification related
> parameters, i.e, enable/disable verification and verify time value?
> 
> For example, if the user wants to change the verify time value, Is
> there a way to change it without disturbing the value of the
> additional fragment size that has been set through LLDP after
> negotiating with the link partner?

Could you please clarify what you mean by "disturbing"? The handler for
the ETHTOOL_MSG_MM_SET message first calls get_mm(struct ethtool_mm_state),
then mm_state_to_cfg(struct ethtool_mm_state, struct ethtool_mm_cfg),
then set_mm(struct ethtool_mm_cfg). In other words, a SET ethtool
command translates into a read-modify-write in the kernel. If user space
did not request the modification of the additional fragment size, just
the verify time, then the set_mm() call will contain the old additional
fragment size and the new verify time.