Hi Gabriel, On Mon, Aug 14, 2023 at 02:23:14PM -0400, Gabriel Krisman Bertazi wrote: > Ming Lei <ming.lei@xxxxxxxxxx> writes: > > > Hello, > > > > Libublk-rs(Rust)[1][2] 0.1.0 is released. > > Hi Ming, > > Do you intend to effectively deprecate the code in ubdsrv in favor of > libublk-rs or do you intend to keep the C library? I'm asking because > I'm looking into how to enable ublk in distributions. So far, there are users of C ubdsrv library, and both are maintained and co-exist, so C library is still kept. Thanks Ming > > Thanks, > > > > > The original idea is to use Rust to write ublk target for covering all > > kinds of block queue limits/parameters combination easily when talking > > with Andreas and Shinichiro about blktests in LSFMM/BPF 2023. > > > > Finally it is evolved into one generic library. Attributed to Rust's > > some modern language features, libublk interfaces are pretty simple: > > > > - one closure(tgt_init) for user to customize device by providing all > > kind of parameter > > > > - the other closure(io handling) for user to handling IO which is > > completely io_uring CQE driven: a) IO command CQE from ublk driver, > > b) target IO CQE originated from target io handling code, c) eventfd > > CQE if IO is offloaded to other context > > > > With low level APIs, <50 LoC can build one ublk-null, and if high level > > APIs are used, 30 LoC is enough. > > > > Performance is basically aligned with pure C ublk implementation[3]. > > > > The library has been verified on null, ramdisk, loop and zoned target. > > The plan is to support async/await in 0.2 or 0.3 so that libublk can > > be used to build complicated target easily and efficiently. > > > > Thanks Andreas for reviewing and providing lots of good ideas for > > improvement & cleanup. Thanks German Maglione for some suggestions, such > > as eventfd support. Thanks Joe for providing excellent Rust programming > > guide. > > > > Any feedback is welcome! > > > > [1] https://crates.io/crates/libublk > > [2] https://github.com/ming1/libublk-rs > > [3] https://github.com/osandov/blktests/blob/master/src/miniublk.c > > > > Thanks, > > Ming > > > > -- > Gabriel Krisman Bertazi > -- Ming
