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doc: uring bdev userguide update

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Signed-off-by: Monica Kenguva <monica.kenguva@intel.com>
Change-Id: Ic365b52d1eb978a0a4c400484bca49f61e4a2708
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/3466
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
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Monica Kenguva 2020-07-21 02:07:58 +00:00 committed by Tomasz Zawadzki
parent 802fd5bf41
commit 685f31d606
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doc/bdev.md
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@ -512,6 +512,23 @@ To remove a block device representation use the bdev_pmem_delete command.
`rpc.py bdev_pmem_delete pmem`
# Uring {#bdev_ug_uring}
The uring bdev module issues I/O to kernel block devices using the io_uring Linux kernel API. This module requires liburing.
For more information on io_uring refer to kernel [IO_uring] (https://kernel.dk/io_uring.pdf)
The user needs to configure SPDK to include io_uring support:
`configure --with-uring`
To create a uring bdev with given filename, bdev name and block size use the `bdev_uring_create` RPC.
`rpc.py bdev_uring_create /path/to/device bdev_u0 512`
To remove a uring bdev use the `bdev_uring_delete` RPC.
`rpc.py bdev_uring_delete bdev_u0`
# Virtio Block {#bdev_config_virtio_blk}
The Virtio-Block driver allows creating SPDK bdevs from Virtio-Block devices.