On Mon, Aug 26, 2019 at 12:01:50PM -0400, Mike Marciniszyn wrote:
From: Kaike Wan kaike.wan@intel.com
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