On 01/16/14 16:12, Sagi Grimberg wrote: > Hey SCSI (and LSF) folks, > > I'd like to propose the following topic for upcoming LSF-MM: > > T10-PI standard is becoming more and more appealing for storage and > cloud solutions. > Since error-detection coding comes with its cost of CPU computation > overhead, > state-of-the-art ASICs offer the ability to offload T10-PI operations > (DIF/DIX), examples > are SAS & FC controllers. Recently, the support for T10-PI offload over > RDMA transactions > was introduced in the Mellanox Connect-IB HCA. > > The first building block, RDMA verbs API supporting T10-PI offload was > submitted over > Linux-rdma (see http://marc.info/?l=linux-rdma&m=138719320307936&w=2). > Moreover, > we have seen first seeds of T10-PI support in Linux SCSI target entering > v3.14 (see > http://lwn.net/Articles/579708/) and RDMA offload implementation in iSER > transport > (see http://www.spinics.net/lists/linux-scsi/msg71128.html). There is > still some ground to > fill to get protection information support to a full solution over all > backend devices. > > We would like to use LSF-MM platform to to push forward T10-PI support > end-to-end which > requires Linux SCSI Target core level support along with transport level > support in iSER and SRP > (and also FCoE in the future) and over to the Initiator side transports. > > Discussion topics: > - Introduce T10-PI offload RDMA verbs and how are used in storage > applications. > - Discuss effects of DIX1.1 (currently a draft) in Target implementation > (core level -> transport level -> HW level). > - Discuss T10-PI Type 4 (16-byte DIF) status and possible implications > on Target & Initiator implementation down to HW level. > - Discuss Current Limitations that T10-PI RDMA offload poses on iSCSI > protocol (ImmediateData, UnsolDataOut) and if/how > they can be solved. > - What-ever else comes to mind... +1 for this topic. As a contributor to the SRP protocol implementation I'm interested in this discussion. Having an API for T10-PI offload in the RDMA core is a prerequisite before T10-PI support can be added in the SRP initiator and target drivers. Bart. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
