linux-kernel - Re: [RFC net-next v2 5/5] net: phy: nxp-c45-tja11xx: implement mdo_insert_tx

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Message-ID: <831bc700-a9a2-7eda-e97b-e1d54dc806f9@oss.nxp.com>
Date:   Fri, 1 Sep 2023 14:58:12 +0300
From:   "Radu Pirea (OSS)" <radu-nicolae.pirea@....nxp.com>
To:     Sabrina Dubroca <sd@...asysnail.net>,
        Radu Pirea <radu-nicolae.pirea@....com>
Cc:     "atenart@...nel.org" <atenart@...nel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Sebastian Tobuschat <sebastian.tobuschat@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC net-next v2 5/5] net: phy: nxp-c45-tja11xx: implement
 mdo_insert_tx_tag

On 01.09.2023 13:07, Sabrina Dubroca wrote:
...
> 
>>> And what happens in this case?
>>>      ip link add link eth0 type macsec offload phy
>>>      ip link set eth0 down
>>>      ip macsec add macsec0 rx sci ...
>>>      ip macsec add macsec0 tx sa 0 ...
>>>      # etc
>>>      ip link set eth0 up
>>>
>>> Will offload work with the current code?
>>
>> (the interface was up before)
>> [root@...rm ~]# ip link add link end0 macsec0 type macsec encrypt on
>> offload phy
>> [root@...rm ~]# ip link set end0 down
>> [root@...rm ~]# ip macsec add macsec0 rx port 1 address
>> 00:01:be:be:ef:33
>> RTNETLINK answers: Operation not supported
> 
> Where does that EOPNOTSUPP come from? nxp_c45_mdo_add_rxsc from this
> version of the code can't return that, and macsec_add_rxsc also
> shouldn't at this point.

This is the source of -EOPNOTSUPP
https://elixir.bootlin.com/linux/latest/source/drivers/net/macsec.c#L1928

-- 
Radu P.