netdev - BUG cxgb3: Check and handle the dma mapping errors

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Message-ID: <51FF14F8.7000204@ozlabs.ru>
Date:	Mon, 05 Aug 2013 12:59:04 +1000
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	Santosh Rastapur <santosh@...lsio.com>,
	Divy Le Ray <divy@...lsio.com>
CC:	Jay Fenlason <fenlason@...hat.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: BUG cxgb3: Check and handle the dma mapping errors

Hi!

Recently I started getting multiple errors like this:

cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr
c000001fbdaaa882 npages 1
cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr
c000001fbdaaa882 npages 1
cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr
c000001fbdaaa882 npages 1
cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr
c000001fbdaaa882 npages 1
cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr
c000001fbdaaa882 npages 1
cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr
c000001fbdaaa882 npages 1
cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr
c000001fbdaaa882 npages 1
... and so on

This is all happening on a PPC64 "powernv" platform machine. To trigger the
error state, it is enough to _flood_ ping CXGB3 card from another machine
(which has Emulex 10Gb NIC + Cisco switch). Just do "ping -f 172.20.1.2"
and wait 10-15 seconds.


The messages are coming from arch/powerpc/kernel/iommu.c and basically
mean that the driver requested more pages than the DMA window has which is
normally 1GB (there could be another possible source of errors -
ppc_md.tce_build callback - but on powernv platform it always succeeds).


The patch after which it broke is:
commit f83331bab149e29fa2c49cf102c0cd8c3f1ce9f9
Author: Santosh Rastapur <santosh@...lsio.com>
Date:   Tue May 21 04:21:29 2013 +0000
cxgb3: Check and handle the dma mapping errors

Any quick ideas? Thanks!


-- 
Alexey
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