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Date: Wed, 02 May 2007 15:50:34 -0700 (PDT) From: David Miller <davem@...emloft.net> To: hch@...radead.org Cc: mchan@...adcom.com, jeff@...zik.org, netdev@...r.kernel.org Subject: Re: [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708. From: Christoph Hellwig <hch@...radead.org> Date: Wed, 2 May 2007 23:48:58 +0100 > On Wed, May 02, 2007 at 01:02:41PM -0700, Michael Chan wrote: > > Let's say I have a 32-bit card that cannot do dual address cycle on a > > 64-bit dma_addr_t system without IOMMU. If CONFIG_HIGHMEM is not set, > > wouldn't the device get > 32-bit DMA addresses that it cannot handle? > > It needs to set it's dma mask to 32bits and the upper layers (net, block) > will do the bouncing for it. Not the case for networking, we rely upon the DMA API to take care of things, which it does. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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