[PATCH V2 2/4] net/bonding: fix non-terminable while loop

[Min Hu (Connor)]

Hi, Ferruh,

在 2022/4/27 2:19, Ferruh Yigit 写道:
> On 3/24/2022 3:00 AM, Min Hu (Connor) wrote:
>> From: Huisong Li <lihuisong at huawei.com>
>>
>> All slaves will be stopped and removed when closing a bonded port. But 
>> the
>> while loop can not stop if both rte_eth_dev_stop and
>> rte_eth_bond_slave_remove fail to run.
>>
> 
> Agree that this is a defect introduced in below commit. Thanks for the fix.
thanks.
> 
>> Fixes: fb0379bc5db3 ("net/bonding: check stop call status")
>> Cc: stable at dpdk.org
>>
>> Signed-off-by: Huisong Li <lihuisong at huawei.com>
>> Signed-off-by: Min Hu (Connor) <humin29 at huawei.com>
>> ---
>>   drivers/net/bonding/rte_eth_bond_pmd.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c 
>> b/drivers/net/bonding/rte_eth_bond_pmd.c
>> index 469dc71170..00d4deda44 100644
>> --- a/drivers/net/bonding/rte_eth_bond_pmd.c
>> +++ b/drivers/net/bonding/rte_eth_bond_pmd.c
>> @@ -2149,13 +2149,14 @@ bond_ethdev_close(struct rte_eth_dev *dev)
>>           return 0;
>>       RTE_BOND_LOG(INFO, "Closing bonded device %s", dev->device->name);
>> -    while (internals->slave_count != skipped) {
>> +    while (skipped < internals->slave_count) {
> 
> When below fixed with adding 'continue', no need to change the check, 
> right? Although new one is also correct.
Agreed.
> 
>>           uint16_t port_id = internals->slaves[skipped].port_id;
>>           if (rte_eth_dev_stop(port_id) != 0) {
>>               RTE_BOND_LOG(ERR, "Failed to stop device on port %u",
>>                        port_id);
>>               skipped++;
>> +            continue;
> 
> Can't we remove the slave even if 'stop()' failed? If so I think better 
> to just log the error and keep continue in that case, what do you think?
NO, if slave stop failed, we cannot remove the slave.
just see the function stack:
rte_eth_bond_slave_remove
__eth_bond_slave_remove_lock_free
slave_remove
rte_eth_dev_internal_reset
if (dev->data->dev_started) {
	RTE_ETHDEV_LOG(ERR, "Port %u must be stopped to allow reset\n",
		dev->data->port_id);
	return;
}

> 
>>           }
>>           if (rte_eth_bond_slave_remove(bond_port_id, port_id) != 0) {
> 
> .