On 04-Dec-18 14:44, Leon Romanovsky wrote: > On Tue, Dec 04, 2018 at 02:04:17PM +0200, Gal Pressman wrote: >> Add EFA node type, transport type and protocol type to core code. >> EFA relies on underlying implementation similar to reliable datagram, so >> we also define a new QP type named Scalable Reliable Datagram (SRD). >> >> EFA reliable datagram transport provides reliable out-of-order delivery, >> transparently utilizing multiple network paths to reduce network tail >> latency. Its interface is similar to UD, in particular it supports >> message size up to MTU, with error handling extended to support reliable >> communication. >> >> Signed-off-by: Gal Pressman <galpress@xxxxxxxxxx> >> --- >> drivers/infiniband/core/verbs.c | 2 ++ >> include/rdma/ib_verbs.h | 9 +++++++-- >> 2 files changed, 9 insertions(+), 2 deletions(-) >> > > Do you have any specification/documentation for that? > > I'm afraid that awesome press release [1] is not enough. > > [1] > https://aws.amazon.com/about-aws/whats-new/2018/11/introducing-elastic-fabric-adapter/ > > Thanks > Hey Leon, The commit message (and part of the cover letter) contains a description of SRD. It is similar to UD in most ways with the addition of reliable out-of-order delivery. The work requests usage are the same as UD with a minor difference in the completion's status codes. The exact specification is internal to AWS, but if you have any more questions I'll be more than happy to answer.
