[dm-devel] [PATCH v2 21/23] libmultipath: foreign/nvme: implement path display

[Hannes Reinecke]

On 03/06/2018 12:15 AM, Martin Wilck wrote:
> implement display of path information for NVMe foreign paths and maps.
> With this patch, I get output like this for Linux NVMe soft targets:
> 
> nvme-submultipathd show topology
> sys0:NQN:subsysname (uuid.96926ba3-b207-437c-902c-4a4df6538c3f) [nvme] nvme0n1 NVMe,Linux,4.15.0-r
> size=2097152 features='n/a' hwhandler='n/a' wp=rw
> `-+- policy='n/a' prio=n/a status=n/a
>   |- 0:1:1 nvme0c1n1 0:0 n/a n/a live
>   |- 0:2:1 nvme0c2n1 0:0 n/a n/a live
>   |- 0:3:1 nvme0c3n1 0:0 n/a n/a live
>   `- 0:4:1 nvme0c4n1 0:0 n/a n/a live
> 
> multipathd show paths format '%G %d %i %o %z %m %N'
> foreign dev       hcil  dev_st serial           multipath host WWNN
> [nvme]  nvme0c1n1 0:1:1 live   1c2c86659503a02f nvme0n1   rdma:traddr=192.168.201.101,trsvcid=4420
> [nvme]  nvme0c2n1 0:2:1 live   1c2c86659503a02f nvme0n1   rdma:traddr=192.168.202.101,trsvcid=4420
> [nvme]  nvme0c3n1 0:3:1 live   1c2c86659503a02f nvme0n1   rdma:traddr=192.168.203.101,trsvcid=4420
> [nvme]  nvme0c4n1 0:4:1 live   1c2c86659503a02f nvme0n1   rdma:traddr=192.168.204.101,trsvcid=4420
> 
> (admittedly, I abused the 'WWNN' wildcard here a bit to display information
> which is helpful for NVMe over RDMA).
> 
> Signed-off-by: Martin Wilck <mwilck at suse.com>
> ---
>  libmultipath/foreign/nvme.c | 334 ++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 320 insertions(+), 14 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare at suse.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare at suse.de			               +49 911 74053 688
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