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Date: Thu, 27 Sep 2007 18:12:59 +1000 From: Benjamin Herrenschmidt <benh@...nel.crashing.org> To: Jeff Garzik <jeff@...zik.org> Cc: FUJITA Tomonori <tomof@....org>, hare@...e.de, open-iscsi@...glegroups.com, hch@...radead.org, davem@...emloft.net, mchristi@...hat.com, netdev@...r.kernel.org, anilgv@...adcom.com, talm@...adcom.com, lusinsky@...adcom.com, uri@...adcom.com, fujita.tomonori@....ntt.co.jp Subject: Re: [PATCH v3 2/2][BNX2]: Add iSCSI support to BNX2 devices. On Thu, 2007-09-27 at 03:49 -0400, Jeff Garzik wrote: > Benjamin Herrenschmidt wrote: > > On Thu, 2007-09-27 at 03:31 -0400, Jeff Garzik wrote: > >> A key problem I was hoping would be solved with your work here was > >> the > >> elimination of that post dma_map_sg() split. > >> > >> If I understood James and Ben correctly, one of the key problems was > >> always in communicating libata's segment boundary needs to the IOMMU > >> layers? > > > > Yup. If we can put some constraint in struct device that the dma mapping > > code can then look at ... we also need to ensure that what's passed in > > for DMA'ing already matches those constraints as well since no-iommu > > platforms will basically just keep the dma table as-is. > > That's a good point... no-iommu platforms would need to be updated to > do the split for me. I suppose we can steal that code from swiotlb or > somewhere. Doing the split means being able to grow the sglist... which the dma_* calls can't do at least not in their current form. Ben. - 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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