Re: [dpdk-stable] [PATCH] net/bonding: do not inherit slave device configuration

[Andrew Rybchenko <arybchenko@solarflare.com>]

On 11/19/19 3:18 PM, Ferruh Yigit wrote:
> On 11/19/2019 9:03 AM, Andrew Rybchenko wrote:
>> Bonding device should control bonded devices configuration.
>>
>> Also avoid usage of slave's data->dev_conf.
>>
>> Fixes: 2efb58cbab6e ("bond: new link bonding library")
>> Cc: stable@dpdk.org
>>
>> Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
>> ---
>>  drivers/net/bonding/rte_eth_bond_pmd.c | 24 ++++++++++++------------
>>  1 file changed, 12 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
>> index 707a0f3cdd..4f0e83205d 100644
>> --- a/drivers/net/bonding/rte_eth_bond_pmd.c
>> +++ b/drivers/net/bonding/rte_eth_bond_pmd.c
>> @@ -1679,6 +1679,7 @@ int
>>  slave_configure(struct rte_eth_dev *bonded_eth_dev,
>>  		struct rte_eth_dev *slave_eth_dev)
>>  {
>> +	struct rte_eth_conf dev_conf;
>>  	struct bond_rx_queue *bd_rx_q;
>>  	struct bond_tx_queue *bd_tx_q;
>>  	uint16_t nb_rx_queues;
>> @@ -1693,34 +1694,34 @@ slave_configure(struct rte_eth_dev *bonded_eth_dev,
>>  	/* Stop slave */
>>  	rte_eth_dev_stop(slave_eth_dev->data->port_id);
>>  
>> +	memset(&dev_conf, 0, sizeof(dev_conf));
>> +
>>  	/* Enable interrupts on slave device if supported */
>>  	if (slave_eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
>> -		slave_eth_dev->data->dev_conf.intr_conf.lsc = 1;
>> +		dev_conf.intr_conf.lsc = 1;
> I assume the original intention is making incremental changes to the existing
> slave configuration, if so we should copy the 'slave_eth_dev->data->dev_conf' to
> 'dev_conf' before start updating it.

The problem is that I don't understand how incremental changes
happen. It simply looks wrong or I don't understand something.
It looks like it is the only place in bonding where slave configuration
is done.