[SPDK] Re: Configuring SPDK NVMe over TCP initiator

Can you please describe how do you want to use the device on initiator side ?

rpc.py communicates with a running SPDK application instance on local host. So please make sure that an SPDK application you want to utilize on initiator side is running first. 

On initiator start ./build/bin/spdk_tgt and issue the previously mentioned RPC. After it successfully connects to the NVMe-oF target,  'rpc.py bdev_get_bdevs' will display the connected bdev.

Similar things can be achieved with other SPDK applications like bdevperf or fio_plugin by using JSON configuration to those tools.

Thanks,
Tomek

> -----Original Message-----
> From: Chethan Seshadri <chethan_seshadri(a)yahoo.com>
> Sent: Friday, January 22, 2021 5:30 PM
> To: Storage Performance Development Kit <spdk(a)lists.01.org>
> Subject: [SPDK] Re: Configuring SPDK NVMe over TCP initiator
> 
>  Thank you Michael and Tomasz.
> While I am able to setup the NVMe over TCP target successfully, for the
> initiator, I executed scripts/setup.sh followed by creating the NVMe device
> of NVMe over TCP resource using the bdev_nvme_attach_controller rpc
> method. But it fails at line # 71 of scripts/rpc/client.py which is basically
> connection establishment error because "Name or service not known". To
> the same NVMe over TCP target, I am able to establish a connection using nc
> i.e.#nc -z -v 10.10.10.1 4420 Do I have to execute any other steps other than
> scripts/setup.sh on the NVMe over TCP initiator side?
> Also, does anyone know if I can use the user mode TCP stack bundled along
> with SPDK for regular TCP communication?
> Thanks,Chethan
>     On Friday, January 22, 2021, 07:40:21 AM GMT+5:30, Michael Haeuptle
> <michaelhaeuptle(a)gmail.com> wrote:
> 
>  Hi Chethan,
> 
> take a look at https://spdk.io/doc/nvmf.html
> <https://spdk.io/doc/nvmf.html> for setting up the NVMF and
> https://spdk.io/doc/bdev.html#bdev_config_nvme
> <https://spdk.io/doc/bdev.html#bdev_config_nvme> for setting up an
> NVMe bdev.
> 
> The basic steps are something like below (haven’t had a chance to verify
> these steps so they may need some adjustments):
> 
> Follow https://spdk.io/doc/system_configuration.html
> <https://spdk.io/doc/system_configuration.html> to set up the
> environment. Basically, you have to run scripts/setup.sh and ensure that the
> NVMe device is using the vfio-pci or uio_pci_generic (lspci -vv to verify or run
> the script again to give status).
> 
> Then create a bdev for the NVMe device and add it as a namespace to a
> NVMF subsystem:
> 
> scripts/rpc.py bdev_nvme_attach_controller -b NVMe1 -t PCIe -a
> 0000:01:00.0
> 
> scripts/rpc.py nvmf_create_transport -t TCP -u 16384 -m 8 -c 8192
> scripts/rpc.py nvmf_create_subsystem nqn.2016-06.io.spdk:cnode1 -a -s
> SPDK00000000000001 -d SPDK_Controller1 scripts/rpc.py
> nvmf_subsystem_add_ns nqn.2016-06.io.spdk:cnode1 NVMe1 scripts/rpc.py
> nvmf_subsystem_add_listener nqn.2016-06.io.spdk:cnode1 -t rdma -a
> 192.168.100.8 -s 4420
> 
> — Michael
> 
> > On Jan 21, 2021, at 5:08 AM, Chethan Seshadri
> <chethan_seshadri(a)yahoo.com> wrote:
> >
> > Hi,
> > Can anyone point me to the steps to configure SPDK NVMe over TCP
> initiator?
> > Thanks,Chethan
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