On Mon, Nov 19, 2018 at 08:16:37AM -0800, Bart Van Assche wrote: > On Mon, 2018-11-19 at 10:45 -0500, Chuck Lever wrote: > > FMR is not supported on most recent RDMA devices. It is also slower > > and less secure than FRWR. As discussed during the RDMA BoF at LPC > > 2018, it is time to remove support for FMR in the NFS/RDMA client > > stack. NFS/RDMA server-side uses either local memory registration or > > FRWR. There is no change required there to deprecate FMR. > > > > There are a few Infiniband/RoCE devices in the kernel tree that do > > not support MEM_MGT_EXTENSIONS, and therefore will no longer support > > client-side NFS/RDMA. These are: > > > > - mthca > > - qib Ooh, qib was not in the list when we talked on this in plumbers. That does change things. Dennis: Could qib be changed? HFI1 supports FRWR right? > > - usnic > > - hns (RoCE) > > Can someone from Intel comment on how many of their customers rely on the qib > driver? > > Can someone from Cisco comment on how many of their customers rely on the usnic > driver? Ignore usnic, it is not a RDMA driver > Can someone from Huawei comment on how many of their customers rely on the hns > driver? Nor was this, this is an actively used driver.. Could hns do FRWR? It is very disappointing that such a new driver does not support FRWR. I guess it is worth stating again that FMR is deprecated. People are going to be disappointed if they try to submit new drivers that don't support FRWR :( Jason
