[LTP] [RFC PATCH v5 0/3] Simplify network setup

[Alexey Kodanev]

On 04.05.2017 14:09, Alexey Kodanev wrote:
> On 03.05.2017 19:07, Petr Vorel wrote:
>> Hi,
>>
>> another version of tst_net_vars network setup helper.
>> v4->v5:
>> * Clenup unneded variables (reverse IP related).
>> * Don't require to have mask in IP address. Use netlink to detect prefix when
>>   address is presented on some of the NIC on the system or fallback to default
>>   ones (24 for IPv4, 64 for IPv6).
>> * Fix detecting wrong subnet with network not round up by 8 (IPv4 resp 16
>>   (IPv6). E.g.: problem IP addressed like 10.2.0.1/22 10.2.1.1/22.
>> * Add more environment variables (e.g. prefix, whole IP address)
>> * Rewritten (again) unused network generation to fix overlap with used IP addresses.
>> * Simplify tst_ipaddr() (in testcases/lib/test_net.sh).
>> * Use tst_brk() to exit on error.
>> * Cleanup warnings and formatting.
>>
>> There is still requirement network prefix to be < 8 (IPv4) resp. 16 (IPv6) as
>> then IPV{4,6}_NETWORK variables would be empty, which is not expected by tests
>> (they join it with address separators with {L,R}HOST_IPV{4,6}_HOST. Even we got
>> rid of reverse related variables we still need IPV{4,6}_NETWORK variables for
>> some tests.
> Hi Petr,
>
> But you removed such dependency on the prefix from test_net.sh  in
> the third patch... so we could just print the warning that configuration
> is not appropriate for the old tests, that is for stress/multicast,
> stress/route groups only.

Regarding IPV{4,6}_NETWORK calculation, I believe it would much
simpler ifwe saved the same part of address from IPV{4,6}_HOST
variables to_NETWORK variable and what is differ to the other
variables.There is no need to any additional checks for these
environment variables or I'm missing something?

Hmm, I didn't find how the patch is getting network prefix
on the remote host, is it because of the assumption that they
should be the same on both hosts? It is fine for now as it's
not so common for a test environment to have different ones,
so the better approach in the future is to make a separate tool
(installed on both hosts with LTP) and get prefixes from
local and remote host similar to tst_get_hwaddrs() in test_net.sh.

Thanks,
Alexey