[SPDK] Re: How to get transport ID from spdk_bdev

Hi Niu,

You can use spdk_bdev_dump_json_info() to get module-specific information related to a given bdev.  If the bdev is an NVMe namespace, this will include the transport ID.

I've prepared a patch that shows how to use this API: https://review.spdk.io/gerrit/c/spdk/spdk/+/4881

In the callback, you can try manually parsing the string data to extract the "pci_address" value.  There is also the spdk_json_parse() API which is probably a lot more code.

-Jim


On 10/26/20, 9:41 AM, "Andrey Kuzmin" <andrey.v.kuzmin(a)gmail.com> wrote:

    There's no readily available way to get transoprt id for nvme, but
    respective call may be added to nvme_ctrlr.c. One could the call it with
    bdev_nvme provided controller as an argument.

    Regards,
    Andrey

    On Mon, Oct 26, 2020, 19:04 Luse, Paul E <paul.e.luse(a)intel.com> wrote:

    > Hi Yawei,
    >
    > Generically the bdev layer won’t have anything like this but each bdev
    > module supports its own set of RPCs that are specific to the bdev.  Take a
    > look a the nvme bdev RPC rpc_dump_nvme_controller_info() and see if it has
    > what you need.  New RPC’s can also be added as makes sense for various use
    > cases (depending on what your inputs are desired outputs are)
    >
    > Hope that helps….
    >
    > Thx
    > Paul
    >
    > From: Niu, Yawei <yawei.niu(a)intel.com>
    > Date: Monday, October 26, 2020 at 12:09 AM
    > To: Storage Performance Development Kit <spdk(a)lists.01.org>
    > Subject: [SPDK] How to get transport ID from spdk_bdev
    > Hi,
    >
    > Is there any way to get transport ID (and ns id) of an existing spdk_bdev?
    > I think that could be useful for the applications built upon bdev layer and
    > want to know the transport ID and namespace ID where the bdev is located,
    > but I failed to find such kind of exported interfaces.
    > I’m wondering if this controller information is deliberately being hidden
    > behind bdev layer? In our use case, we just want to get the association of
    > bdev and ctrlr/ns for configuration management purpose.
    >
    > Thanks
    > -Niu
    > _______________________________________________
    > SPDK mailing list -- spdk(a)lists.01.org
    > To unsubscribe send an email to spdk-leave(a)lists.01.org
    > _______________________________________________
    > SPDK mailing list -- spdk(a)lists.01.org
    > To unsubscribe send an email to spdk-leave(a)lists.01.org
    >
    _______________________________________________
    SPDK mailing list -- spdk(a)lists.01.org
    To unsubscribe send an email to spdk-leave(a)lists.01.org