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Date: Tue, 22 Jun 2010 16:21:43 -0500 From: david.hagood@...il.com To: linux-kernel@...r.kernel.org Subject: PCI Non-transparent bridge support? Is anybody working on supporting configuring PCI non-transparent bridges in Linux? For anybody who does NOT know what a non-transparent bridge is: an NTB is a device that connects as a PCI device on two separate PCI root complexes. It then allows each root complex to map regions of its PCI address space into the address space of the other root complex. It is, in effect, a "null-modem" for PCI. You cannot directly connect two root complexes (e.g. just tie 2 computers together) by connecting their PCI buses - each root complex wants to be "in charge". The NTB allows each root complex to view the other as a PCI device exporting some number of base address registers (BARs), and by accessing one of those BARs the other root complex sees a PCI device (the NTB) doing a bus master operation on its bus. For a project for my employer I need a driver for NTBs - I'm going to try to get all the permissions to GPL it and submit it to the kernel, but obviously if somebody else is working on this I'd rather work with them. I'm using my personal email here, as my work email (david.hagood@...oflex.com) unfortunately has a paragraph of legalese attached by the email system. -- 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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