Re: [dpdk-dev] [PATCH v2] net/bonding: fix update link status on slave add

[Radu Nicolau <radu.nicolau@intel.com>]

On 5/31/2018 4:36 PM, Ferruh Yigit wrote:
> On 5/31/2018 4:34 PM, Ferruh Yigit wrote:
>> On 5/31/2018 3:34 PM, Radu Nicolau wrote:
>>
>> I can see you just prefix "fix" to the title without updating it :)
>>
>> What about following one:
>> "net/bonding: fix slave add for mode 4" ?
Great, I'll use it for v3 :)

>>
>>> Add a call to rte_eth_link_get_nowait on every slave to update
>>> the internal link status struct. Otherwise slave add will fail
>>> for mode 4 if the ports are all stopped but only one of them checked.
>> What is the link related expectation from slaves in mode 4?
To be identical across all ports
>>
>> What does "if the ports are all stopped but only one of them checked" mean, why
>> checking only one of them?
This is the behavior of testpmd, stop getting the link status after the 
first down port; but this should not affect bonding, so there is no need 
to update testpmd.

>>
>>> Fixes: b77d21cc2364 ("ethdev: add link status get/set helper functions")
>>> Bugzilla entry: https://dpdk.org/tracker/show_bug.cgi?id=52
> Bugzilla ID: 52
>
> btw, can you please send new version as reply to previous version?
Sure.

>
>>> Signed-off-by: Radu Nicolau <radu.nicolau@intel.com>
>>> ---
>>> v2: add fix and Bugzilla references
>>>
>>>   drivers/net/bonding/rte_eth_bond_api.c | 2 ++
>>>   1 file changed, 2 insertions(+)
>>>
>>> diff --git a/drivers/net/bonding/rte_eth_bond_api.c b/drivers/net/bonding/rte_eth_bond_api.c
>>> index d558df8..cad08b9 100644
>>> --- a/drivers/net/bonding/rte_eth_bond_api.c
>>> +++ b/drivers/net/bonding/rte_eth_bond_api.c
>>> @@ -296,6 +296,8 @@ __eth_bond_slave_add_lock_free(uint16_t bonded_port_id, uint16_t slave_port_id)
>>>   		return -1;
>>>   	}
>>>   
>>> +	rte_eth_link_get_nowait(slave_port_id, &link_props);
>>> +
>> The error seems in link_properties_valid(), does it make sense to get link info
>> inside that function before link checks?
Not really, as one might expect that link_properties_valid will only 
test the struct rte_eth_link *slave_link argument, not update it.

>>
>>>   	slave_add(internals, slave_eth_dev);
>>>   
>>>   	/* We need to store slaves reta_size to be able to synchronize RETA for all
>>>