On Tue, Nov 23, 2010 at 9:16 AM, Mike Christie <michaelc@xxxxxxxxxxx> wrote: > On 11/22/2010 02:11 PM, Mike Christie wrote: >> The initiator is all in userspace, right? Is there any plans on >> supporting offload? Would you create some offloaded connection using a >> driver like bnx2i/cxgb3i/be2iscsi/qla4xxx then pass/get pdus through it? Yes, it is all in userspace. My goal is to have a library/client, posix compliant so that it runs on all platforms, and all in userspace. > > Oh yeah, there is also a libiscsi for userspace apps here: > http://git.kernel.org/?p=linux/kernel/git/mnc/open-iscsi.git;a=tree;f=libiscsi;h=da40a4845058b1c23d803dc91a1fbc7c225c7025;hb=qla4xxx > This uses the open-iscsi kernel code, so it is probably not going to help > you. An updated versions is currently shipped in red hat distro's (can send > the patch if you want) and used by the installer, anaconda, to discover and > log into targets and find disks. > > Do you think there will be overlap? Just wondering because for open-iscsi we > are trying to modify that lib to support more operations, so it is useful to > other apps but if your lib ends up supporting everything we need we would > just use it instead. Yes, there will be overlap :-) At this stage, anything based on open-iscsi has a very much more mature implementation of the iscsi layer. Eventually I want the library to support all useful SCSI functions in SBC, MMC, SSC, and maybe SMC. I want it to be able to do marshalling and unmarshalling of most useful structures passed in DATA-IN/DATA-OUT. I also want the iscsi layer to be reasonably complete. I got a lot of responses to this, so there does seem to be interest for a client library for general purpose use. Now, I initially only wanted something for myself, to get KVM to use iscsi directly. (I find it VERY annoying that open-iscsi make the devices visible to the host), and also to hook into DBENCH, which has a functioning but otherwise very poor synchronous initiator built in. When your tool does "login and discover LUNs" what operations does that involve and would you need ? Is this something similar to this ? $ ./iscsi-ls --portal=127.0.0.1 --show-luns Target:iqn.ronnie.test Portal:127.0.0.1:3260,1 Lun:0 Type:STORAGE_ARRAY_CONTROLLER Lun:1 Type:DIRECT_ACCESS Size:5G Lun:2 Type:MMC Now, I just need to think of where to take this "for KVM and for DBENCH" library onto a public git tree so others can use and contribute to it. regards ronnie sahlberg -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
