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Date: Thu, 10 May 2007 17:11:17 +0530 From: Mahesh <maheshk@...c.in> To: David Miller <davem@...emloft.net> CC: linux-kernel@...r.kernel.org, kernelnewbies@...linux.org Subject: Re: [HOWTO] accessing the DMA mapped data Hi, > You haven't given an example of where this might actually happen. > > The driver is where the DMA mappings almost always occur because > that is the layer that knows the bus technology and therefore > the correct DMA interfaces to call. > > What kind of driver do you have and what is this upper layer > doing the mappings for you but not giving you a pointer to > the kernel buffer as well? > Here I am dealing with a infiniband (see www.openfabrics.org) network device driver. The layer above the driver is the standard infiniband core interface. Now I have a situation where I need to peek into the packets and do some modifications(some hacking). So I just want know whether I can access the original data region using the bus address generated by the dma_map_single. FYI, architecture I am working on is x86_64. -Mahesh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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