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# Python bindings for libnvme
We use [SWIG](http://www.swig.org/) to generate Python bindings for libnvme.
## How to use
```python
#!/usr/bin/env python3
import sys
import pprint
from libnvme import nvme
def disc_supp_str(dlp_supp_opts):
bitmap = {
nvme.NVMF_LOG_DISC_LID_EXTDLPES: "EXTDLPES",
nvme.NVMF_LOG_DISC_LID_PLEOS: "PLEOS",
nvme.NVMF_LOG_DISC_LID_ALLSUBES: "ALLSUBES",
}
return [txt for msk, txt in bitmap.items() if dlp_supp_opts & msk]
root = nvme.root() # This is a singleton
root.log_level('debug') # Optional: extra debug info
host = nvme.host(root) # This "may be" a singleton.
subsysnqn = [string] # e.g. nvme.NVME_DISC_SUBSYS_NAME, ...
transport = [string] # One of: 'tcp', 'rdma', 'fc', 'loop'.
traddr = [IPv4 or IPv6] # e.g. '192.168.10.10', 'fd2e:853b:3cad:e135:506a:65ee:29f2:1b18', ...
trsvcid = [string] # e.g. '8009', '4420', ...
host_iface = [interface] # e.g. 'eth1', ens256', ...
ctrl = nvme.ctrl(root, subsysnqn=subsysnqn, transport=transport, traddr=traddr, trsvcid=trsvcid, host_iface=host_iface)
try:
cfg = {
'hdr_digest': True, # Enable header digests
'data_digest': False, # Disable data digests
}
ctrl.connect(host, cfg)
print(f"connected to {ctrl.name} subsys {ctrl.subsystem.name}")
except Exception as e:
sys.exit(f'Failed to connect: {e}')
supported_log_pages = ctrl.supported_log_pages()
try:
# Get the supported options for the Get Discovery Log Page command
dlp_supp_opts = supported_log_pages[nvme.NVME_LOG_LID_DISCOVER] >> 16
except (TypeError, IndexError):
dlp_supp_opts = 0
print(f"LID {nvme.NVME_LOG_LID_DISCOVER:02x}h (Discovery), supports: {disc_supp_str(dlp_supp_opts)}")
try:
lsp = nvme.NVMF_LOG_DISC_LSP_PLEO if dlp_supp_opts & nvme.NVMF_LOG_DISC_LID_PLEOS else 0
log_pages = ctrl.discover(lsp=lsp)
print(pprint.pformat(log_pages))
except Exception as e:
sys.exit(f'Failed to retrieve log pages: {e}')
try:
ctrl.disconnect()
except Exception as e:
sys.exit(f'Failed to disconnect: {e}')
ctrl = None
host = None
root = None
```
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