On Mon, Jul 20, 2015 at 06:31:11PM -0400, Chuck Lever wrote: > > On Jul 20, 2015, at 6:26 PM, Jason Gunthorpe > <[email protected]> wrote: > > > On Mon, Jul 20, 2015 at 03:03:11PM -0400, Chuck Lever wrote: > >> + iov->length = size; > >> + iov->lkey = ia->ri_have_dma_lkey ? > >> + ia->ri_dma_lkey : ia->ri_bind_mem->lkey; > >> + rb->rg_size = size; > >> + rb->rg_owner = NULL; > >> return rb; > > > > There is something odd looking about this.. > > > > ri_bind_mem is only setup in the RPCRDMA_ALLPHYSICAL and > > RPCRDMA_MTHCAFMR cases. > > > > RPCRDMA_FRMR doesn't set it up. > > > > So this code in rpcrdma_alloc_regbuf is never called for the FRMR > > case? > > > > If yes, then, how is FRMR working? There is absolutely no reason to > > use FRMR to register local send buffers, just use the global all > > memory lkey... > > > > If no, then that is an oops? > > I’ve tested this code, no oops. > > FRWR always uses the DMA lkey. xprtrdma does not use FRWR if > IB_DEVICE_LOCAL_DMA_LKEY is not asserted.
Ah, I see. Ok. Is there a reason to link FRWR and LOCAL_DMA_LKEY together? Just use the code you have for fmr with frwr to get the lkey, probably move it to rpcrdma_ia_open .. Physical MR should create a 2nd MR dedicated for rkey use. That will work really well with the series I'm working on: https://github.com/jgunthorpe/linux/tree/remove-ib_get_dma_mr To just drop ib_get_dma_mr entirely. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
