netdev - Information on DSA driver initialization

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Date:   Thu, 5 Mar 2020 17:24:47 -0500
From:   Sriram Chadalavada <sriram.chadalavada@...dleap.ca>
To:     netdev@...r.kernel.org
Subject: Information on DSA driver initialization

Is there information in kernel documentation or elsewhere about DSA
initialization process starting from the device tree parse to the
Marvell switch being detected?

The specific problem I'm facing is that while I see this:
root@...ub:/# dmesg | grep igb
[ 1.314324] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.4.0-k
[ 1.314332] igb: Copyright (c) 2007-2014 Intel Corporation.
[ 1.314679] igb 0000:03:00.0: enabling device (0140 -> 0142)
[ 1.343926] igb 0000:03:00.0: added PHC on eth0
[ 1.343938] igb 0000:03:00.0: Intel(R) Gigabit Ethernet Network Connection
[ 1.343949] igb 0000:03:00.0: eth0: (PCIe:2.5Gb/s:Width x1) c4:48:38:00:63:eb
[ 1.344019] igb 0000:03:00.0: eth0: PBA No: 000300-000
[ 1.344030] igb 0000:03:00.0: Using MSI-X interrupts. 4 rx queue(s), 4
tx queue(s)
[ 1.344464] libphy: igb_enet_mii_bus: probed

I do NOT see this in the log:
[ 1.505474] libphy: mdiobus_find: mii bus [igb_enet_mii_bus] found
[ 1.645075] igb 0000:03:00.0 eth0: [0]: detected a Marvell 88E6176 switch
[ 24.341748] igb 0000:03:00.0 eth0: igb_enet_mii_probe starts
[ 24.344928] igb 0000:03:00.0 eth0: igb: eth0 NIC Link is Up 1000 Mbps
Full Duplex, Flow Control: RX/TX

Any suggestions/speculations what may be going on here?