netdev - Re: tg3: not checking dma errors?

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Message-ID: <1259777028.16397.4.camel@johannes.local>
Date:	Wed, 02 Dec 2009 19:03:47 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Matt Carlson <mcarlson@...adcom.com>
Cc:	netdev <netdev@...r.kernel.org>, Michael Chan <mchan@...adcom.com>
Subject: Re: tg3: not checking dma errors?

On Wed, 2009-12-02 at 09:13 -0800, Matt Carlson wrote:

> Yes.  I submitted a patch to the net-next-2.6 tree addressing this exact
> problem.  It will appear in the 2.6.33 kernel.  The patch is appended at
> the bottom of this email.

Cool, thanks, I'll stick it into my tree and see what happens.

> What kind of trouble are you seeing?  What device are you working with?

I have a dual-port device, see lspci info below. The device is in a
machine with 6.5GiB memory, and large disks. Now I rsync a lot of data
over gigabit (but I think I never set up jumbo frames) to the disk, say
50GiB data. During that, eventually the memory will fill with cached
filesystem data.

If I allow that to happen, the machine will eventually crash, and tg3
shows up in the stack trace -- but I can't see all of it on the display.
I can work around it by periodically telling the kernel to drop
filesystem caches so it never fills the entire memory with cached data.

johannes

0001:05:04.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5780 Gigabit Ethernet (rev 03)
	Subsystem: Apple Computer Inc. Device 0085
	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: 16 (16000ns min), Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 34
	Region 0: Memory at fa530000 (64-bit, non-prefetchable) [size=64K]
	Region 2: Memory at fa520000 (64-bit, non-prefetchable) [size=64K]
	Expansion ROM at <ignored> [disabled]
	Capabilities: [40] PCI-X non-bridge device
		Command: DPERE- ERO- RBC=512 OST=1
		Status: Dev=05:04.0 64bit+ 133MHz+ SCD- USC- DC=simple DMMRBC=2048 DMOST=1 DMCRS=16 RSCEM- 266MHz- 533MHz-
	Capabilities: [48] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable+ DSel=0 DScale=1 PME-
	Capabilities: [50] Vital Product Data
		Product Name: Broadcom NetXtreme Gigabit Ethernet Controller
		Read-only fields:
			[PN] Part number: BCM95780
			[EC] Engineering changes: 106679-15
			[SN] Serial number: 0123456789
			[MN] Manufacture ID: 31 34 65 34
			[RV] Reserved: checksum bad, 28 byte(s) reserved
		Read/write fields:
			[YA] Asset tag: XYZ01234567
			[RW] Read-write area: 107 byte(s) free
		End
	Capabilities: [58] MSI: Enable+ Count=1/8 Maskable- 64bit+
		Address: 00000000fee00000  Data: 000d
	Kernel driver in use: tg3

0001:05:04.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5780 Gigabit Ethernet (rev 03)
	Subsystem: Apple Computer Inc. Device 0085
	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: 16 (16000ns min), Cache Line Size: 64 bytes
	Interrupt: pin B routed to IRQ 67
	Region 0: Memory at fa510000 (64-bit, non-prefetchable) [size=64K]
	Region 2: Memory at fa500000 (64-bit, non-prefetchable) [size=64K]
	Capabilities: [40] PCI-X non-bridge device
		Command: DPERE- ERO+ RBC=512 OST=1
		Status: Dev=05:04.1 64bit+ 133MHz+ SCD- USC- DC=simple DMMRBC=2048 DMOST=1 DMCRS=16 RSCEM- 266MHz- 533MHz-
	Capabilities: [48] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-
	Capabilities: [50] Vital Product Data
		Product Name: Broadcom NetXtreme Gigabit Ethernet Controller
		Read-only fields:
			[PN] Part number: BCM95780
			[EC] Engineering changes: 106679-15
			[SN] Serial number: 0123456789
			[MN] Manufacture ID: 31 34 65 34
			[RV] Reserved: checksum bad, 28 byte(s) reserved
		Read/write fields:
			[YA] Asset tag: XYZ01234567
			[RW] Read-write area: 107 byte(s) free
		End
	Capabilities: [58] MSI: Enable- Count=1/8 Maskable- 64bit+
		Address: 820170100a07bcb4  Data: 6548
	Kernel driver in use: tg3


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