On Mon, Aug 26, 2019 at 12:01:50PM -0400, Mike Marciniszyn wrote: > From: Kaike Wan <kaike.wan@xxxxxxxxx> > > Upstream commit d58c1834bf0d218a0bc00f8fb44874551b21da84. > > In a congested fabric with adaptive routing enabled, traces show that > the sender could receive stale TID RDMA NAK packets that contain newer > KDETH PSNs and older Verbs PSNs. If not dropped, these packets could > cause the incorrect rewinding of the software flows and the incorrect > completion of TID RDMA WRITE requests, and eventually leading to memory > corruption and kernel crash. > > The current code drops stale TID RDMA ACK/NAK packets solely based > on KDETH PSNs, which may lead to erroneous processing. This patch > fixes the issue by also checking the Verbs PSN. Addition checks are > added before rewinding the TID RDMA WRITE DATA packets. > > [ported to 5.2 from upstream accounting for fspsn replacing flpsn.] Now applied, thanks. greg k-h
