netdev - r8169 mac reading/writing broken

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Date:	Sat, 27 Mar 2010 12:28:07 +0200
From:	Timo Teräs <timo.teras@....fi>
To:	Francois Romieu <romieu@...zoreil.com>,
	Ivan Vecera <ivecera@...hat.com>, netdev@...r.kernel.org
Subject: r8169 mac reading/writing broken

It seems that my r8169 mac address is lost when r8169 module is reloaded,
or system is soft rebooted. Hard power reset recovers the mac address again.
The commit cc098dc705895f6b0109b7e8e026ac2b8ae1c0a1 (r8169: restore mac addr
in rtl8169_remove_one and rtl_shutdown) seems to have broken it. The first four
bytes of mac address go zeroes because of this.

I did some more testing, and added debugging info to rtl_rar_set(). It would
appear that even if I write any mac address (with ifconfig) and reread the
MAC0..MAC5 register, the first four bytes get zeroed. So it would sounds like
the hardware is faulty, or that the rtl_rar_set function is buggy.

Any suggestions to fix this?

The hardware in question is a 3-in-1 NIC. Each three PCI devices shows up as
something like:

00:09.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL-8110SC/8169SC Gigabit Ethernet [10ec:8167] (rev 10)
	Subsystem: Jetway Information Co., Ltd. Device [16f3:10ec]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 64 (8000ns min, 16000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: I/O ports at f200 [size=256]
	Region 1: Memory at fdfff000 (32-bit, non-prefetchable) [size=256]
	[virtual] Expansion ROM at 3c000000 [disabled] [size=128K]
	Capabilities: [dc] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0-,D1+,D2+,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: r8169

And the kernel drivers prints the following at startup:

r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
r8169 0000:00:09.0: PCI->APIC IRQ transform: INT A -> IRQ 18
r8169 0000:00:09.0: no PCI Express capability
eth0: RTL8169sc/8110sc at 0xf81ae000, 00:30:18:a6:2b:6c, XID 18000000 IRQ 18
r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
r8169 0000:00:0b.0: PCI->APIC IRQ transform: INT A -> IRQ 19
r8169 0000:00:0b.0: no PCI Express capability
eth1: RTL8169sc/8110sc at 0xf81b2000, 00:30:18:a6:2b:6d, XID 18000000 IRQ 19
r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
r8169 0000:00:0c.0: PCI->APIC IRQ transform: INT A -> IRQ 16
r8169 0000:00:0c.0: no PCI Express capability
eth2: RTL8169sc/8110sc at 0xf81b6000, 00:30:18:a6:2b:6e, XID 18000000 IRQ 16

- Timo
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