Re: [PATCH net] bonding: show NS IPv6 targets in proc master info

[Jonathan Toppins <jtoppins@redhat.com>]

On 5/29/22 23:01, Hangbin Liu wrote:
> On Fri, May 27, 2022 at 04:21:45PM -0700, Jay Vosburgh wrote:
>> Jonathan Toppins <jtoppins@redhat.com> wrote:
>>
>>> On 5/27/22 02:44, Hangbin Liu wrote:
>>>> When adding bond new parameter ns_targets. I forgot to print this
>>>> in bond master proc info. After updating, the bond master info will looks
>>>                                                                look ---^
>>>> like:
>>>> ARP IP target/s (n.n.n.n form): 192.168.1.254
>>>> NS IPv6 target/s (XX::XX form): 2022::1, 2022::2
>>>> Fixes: 4e24be018eb9 ("bonding: add new parameter ns_targets")
>>>> Reported-by: Li Liang <liali@redhat.com>
>>>> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
>>>> ---
>>>>    drivers/net/bonding/bond_procfs.c | 13 +++++++++++++
>>>>    1 file changed, 13 insertions(+)
>>>> diff --git a/drivers/net/bonding/bond_procfs.c
>>>> b/drivers/net/bonding/bond_procfs.c
>>>> index cfe37be42be4..b6c012270e2e 100644
>>>> --- a/drivers/net/bonding/bond_procfs.c
>>>> +++ b/drivers/net/bonding/bond_procfs.c
>>>> @@ -129,6 +129,19 @@ static void bond_info_show_master(struct seq_file *seq)
>>>>    			printed = 1;
>>>>    		}
>>>>    		seq_printf(seq, "\n");
>>>
>>> Does this need to be guarded by "#if IS_ENABLED(CONFIG_IPV6)"?
>>
>> 	On looking at it, the definition of ns_targets in struct
>> bond_params isn't gated by CONFIG_IPV6, either (and is 256 bytes for
>> just ns_targets).
>>
>> 	I suspect this will all compile even if CONFIG_IPV6 isn't
>> enabled, since functions like ipv6_addr_any are defined regardless of
>> the CONFIG_IPV6 setting, but it's dead code that shouldn't be built if
>> CONFIG_IPV6 isn't set.
> 
> Yes, I didn't protect the code if if could be build without CONFIG_IPV6.
> e.g. function bond_get_targets_ip6(). Do you think if I should also
> add the condition for bond_get_targets_ip6() and ns_targets in struct
> bond_params?

Yes, if the code that will use the entries in `struct bonding` and 
`struct bond_params` is going to be compiled out these entries should be 
compiled out as well.

Also, I was looking over the code in bond_options.c:bond_opts, and the 
entry `BOND_OPT_NS_TARGETS` is the only bonding option that will be left 
uninitialized if IPv6 is disabled. Does the bonding options infra handle 
this correctly or do you need a dummy set of values when IPv6 is disabled?