On 11/19/2015 05:23 PM, Dennis Dalessandro wrote: > On Thu, Nov 12, 2015 at 04:13:18PM -0500, Dennis Dalessandro wrote: >> The major todo for the hfi1 driver in staging is getting rid of the >> verbs code duplication between ipath, qib, and now hfi1. The ipath >> driver has been deprecated and is going to be deleted soon. So that >> leaves qib and hfi. To address this we have proposed rdmavt which will >> be a common kmod that provides software RDMA verbs support. qib and >> hfi1 will both use this as well as other forthcoming drivers such as >> soft-roce. See this thread for some details: >> http://www.spinics.net/lists/linux-rdma/msg29922.html. >> >> Since that initial RFC we have been accumulating patches in a GitHub >> repo for an early look at the development. At some point soon we want >> to actually start posting the patches to the mailing list. This is >> where it gets tricky. The code basically not only adds a new driver >> but it modifies two existing ones, heavily. To make it more murky one >> driver is in staging the other is in the usual drivers/infiniband tree. >> >> The question is, how do we go about this logistically due to the 2 >> drivers being in separate sub-trees? >> >> Greg, Doug, >> As the maintainers of the two trees involved we'd kind of like to get >> your thoughts on this. > > Hi Greg and Doug, > > Just wanted to ping you guys again in case my mail last week slipped > through the cracks. We are at the point now where we have some patches > we can start posting. Looking for some logistical guidance. Sorry, I've been out for a while now with the birth of my second child. Things have settled down enough around here that I should be able to get things going again (at least well enough to be more responsive to email anyway). So, as to the hfi1/qib/rxe transport library. The qib driver is in the rdma tree, and we aren't going to move it to staging just because it depends on something in staging, so we need to start adding the library in the core tree to avoid dependency issues. As for the hfi1 driver, I'm of the opinion that putting it in staging because of the code duplication issue was probably not the right thing to do. It's benefited from the extra eyes on it to help make it a better driver, but I think I'm ready to move it to the main RDMA tree and start working on it from there where there won't be any cross tree dependency issues. To that end, I've opened my 4.4-rc branch and deleted the three deprecated drivers from staging and moved hfi1 to the rdma tree. I've sent an email to Linus to see if he's ok taking those changes, and if so, I'll get them submitted and then open up my for-4.5 branch early to be able to start taking for-next patches. -- Doug Ledford <dledford@xxxxxxxxxx> GPG KeyID: 0E572FDD
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