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Mon, 4 Aug 2025 14:47:10 +0000 Date: Mon, 4 Aug 2025 16:47:03 +0200 From: Alexander Wilhelm To: Vladimir Oltean Cc: "Russell King (Oracle)" , Andrew Lunn , Heiner Kallweit , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Aquantia PHY in OCSGMII mode? 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X-MS-Exchange-CrossPremises-SCL: 1 X-MS-Exchange-CrossPremises-Processed-By-Journaling: Journal Agent X-OrganizationHeadersPreserved: DB5P192MB2200.EURP192.PROD.OUTLOOK.COM X-Proofpoint-GUID: kHYeyy5Pqcr3W98FYqqZcwjivLPZ1zwi X-Authority-Analysis: v=2.4 cv=O+I5vA9W c=1 sm=1 tr=0 ts=6890c7f0 cx=c_pps a=LoGhXiM/JxXibspYCOTuzw==:117 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=8gLI3H-aZtYA:10 a=-i4I5E_jAAAA:8 a=2imQQCwUAAAA:8 a=FJmkK1aqQc_TlGh1ubwA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=YQreJwxzuLcQAHRr27xt:22 a=ssJKQMnrLbq1UR0lVSsA:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODA0MDA4MSBTYWx0ZWRfX4Zlle6WN32YF ewPJ3E6JeHPCfCrpfTec3PW061XD8M7HcT4D8OTHFXHraVTeV/gqE+F96v+1VG4KIC55RvdKfto P7kjuj+0G047BF6/UUyydY0AnoGsvoOPprpKfXp7NDhITv9vtZUprzP+qr9xYLE5g9nNwJK2f/f tYdcOO05WkQScCkzEqViUrrWVsjo7Gl3ohAHfU38iFxSyPQvRXNNJbeXZZ24b2RtZLKXJvZWlLI ZaBMBt8Kw5vBELIko+S6IOHFN9amGG2jF/C2lDhpW4nkCfUrCZ8F+PbAdtit8RPK5LpJJGzA1tN 82S8R0BOtOTe1+jWztRhAQiRcOs0DXSy9RQOJEbkkAa7AkKzb+U0b2kLLlb5vo= X-Proofpoint-ORIG-GUID: kHYeyy5Pqcr3W98FYqqZcwjivLPZ1zwi Am Mon, Aug 04, 2025 at 04:41:15PM +0300 schrieb Vladimir Oltean: > Hi Alexander, > > On Mon, Aug 04, 2025 at 03:01:44PM +0200, Alexander Wilhelm wrote: > > > Please find the attached patch. > > [...] > > > > Hi Vladimir, > > > > I’ve applied the patch you provided, but it doesn’t seem to fully resolve the > > issue -- or perhaps I’ve misconfigured something. I’m encountering the following > > error during initialization: > > > > mdio_bus 0x0000000ffe4e7000:00: AN not supported on 3.125GHz SerDes lane > > fsl_dpaa_mac ffe4e6000.ethernet eth0: pcs_config failed: -EOPNOTSUPP > > > > The relevant code is located in `drivers/net/pcs/pcs-lynx.c`, within the > > `lynx_pcs_config(...)` function. In the case of 2500BASE-X with in-band > > autonegotiation enabled, the function logs an error and returns -EOPNOTSUPP. > > Once I saw this I immediately realized my mistake. More details at the end. > > > From what I can tell, autonegotiation isn’t supported on a 3.125GHz SerDes lane > > when using 2500BASE-X. What I’m unclear about is how this setup is supposed to > > work in practice. My understanding is that on the host side, communication > > always uses OCSGMII with flow control, allowing speed pacing via pause frames. > > But what about the line side -- should it be configurable, or is it expected to > > operate in a fixed mode? > > So there are two "auto-negotiation" processes involved. > > > +-----+ internal +-----+ 2500base-x +-----------+ 2.5GBase-T +------------+ > | MAC |==========| PCS |===========================| Local PHY |==============| Remote PHY | ... > +-----+ GMII not +-----+ in-band autonegotiation +-----------+ clause 28 +------------+ > represented in the autonegotiation > device tree (1) (2) [...] Hi Vladimir, thank you for the detailed explanation. I feel I now have a clearer understanding of what's happening under the hood. > What I failed to consider is that the FMan mEMAC driver sets phylink's > "default_an_inband" property to true, making it as if the device tree > node had this property anyway. > > The driver needs to be further patched to prevent that from happening. > Here's a line that needs to be squashed into the previous change, could > you please retest with it? > > --- a/drivers/net/ethernet/freescale/fman/fman_memac.c > +++ b/drivers/net/ethernet/freescale/fman/fman_memac.c > @@ -1229,6 +1229,7 @@ int memac_initialization(struct mac_device *mac_dev, > * those configurations modes don't use in-band autonegotiation. > */ > if (!of_property_present(mac_node, "managed") && > + mac_dev->phy_if != PHY_INTERFACE_MODE_2500BASEX && > mac_dev->phy_if != PHY_INTERFACE_MODE_MII && > !phy_interface_mode_is_rgmii(mac_dev->phy_if)) > mac_dev->phylink_config.default_an_inband = true; I’ve applied this patch as well, which brought me a step further. Unfortunately, I still don’t get a ping response, although the configuration looks correct to me. Below are the logs and the `ethtool` output I’m seeing: user@host:~# logread | grep eth kern.info kernel: [ 20.777530] fsl_dpaa_mac ffe4e6000.ethernet: FMan MEMAC kern.info kernel: [ 20.782840] fsl_dpaa_mac ffe4e6000.ethernet: FMan MAC address: 00:00:5b:05:a2:cb kern.info kernel: [ 20.793126] fsl_dpaa_mac ffe4e6000.ethernet eth0: Probed interface eth0 kern.info kernel: [ 31.058431] usbcore: registered new interface driver cdc_ether user.notice netifd: Added device handler type: veth kern.info kernel: [ 48.171837] fsl_dpaa_mac ffe4e6000.ethernet eth0: PHY [0x0000000ffe4fd000:07] driver [Aquantia AQR115] (irq=POLL) kern.info kernel: [ 48.171861] fsl_dpaa_mac ffe4e6000.ethernet eth0: configuring for phy/2500base-x link mode kern.info kernel: [ 48.181338] br-lan: port 1(eth0) entered blocking state kern.info kernel: [ 48.181363] br-lan: port 1(eth0) entered disabled state kern.info kernel: [ 48.181399] fsl_dpaa_mac ffe4e6000.ethernet eth0: entered allmulticast mode kern.info kernel: [ 48.181577] fsl_dpaa_mac ffe4e6000.ethernet eth0: entered promiscuous mode kern.info kernel: [ 53.304459] fsl_dpaa_mac ffe4e6000.ethernet eth0: Link is Up - 2.5Gbps/Full - flow control rx/tx kern.info kernel: [ 53.304629] br-lan: port 1(eth0) entered blocking state kern.info kernel: [ 53.304642] br-lan: port 1(eth0) entered forwarding state daemon.notice netifd: Network device 'eth0' link is up daemon.info lldpd[6849]: libevent 2.1.12-stable initialized with epoll method daemon.info charon: 10[KNL] flags changed for fe80::200:5bff:fe05:a2cb on eth0 user@host:~# ethtool eth0 Settings for eth0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Full 100baseT/Full 1000baseT/Full 2500baseT/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 10baseT/Full 100baseT/Full 1000baseT/Full 2500baseT/Full Advertised pause frame use: Symmetric Receive-only Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Link partner advertised link modes: 100baseT/Full 1000baseT/Full 10000baseT/Full 2500baseT/Full 5000baseT/Full Link partner advertised pause frame use: Symmetric Receive-only Link partner advertised auto-negotiation: Yes Link partner advertised FEC modes: Not reported Speed: 2500Mb/s Duplex: Full Port: Twisted Pair PHYAD: 7 Transceiver: external Auto-negotiation: on MDI-X: on Current message level: 0x00002037 (8247) drv probe link ifdown ifup hw Link detected: yes I will continue investigating why the ping isn’t working and will share any new findings as soon as I have them. Thanks again for your support! Best regards Alexander Wilhelm