[dpdk-dev] [PATCH] Revert "bonding: use existing enslaved device queues"

Ilya Maximets i.maximets at samsung.com
Tue Oct 18 14:49:29 CEST 2016


On 18.10.2016 15:28, Jan Blunck wrote:
> If the application already configured queues the PMD should not
> silently claim ownership and reset them.
> 
> What exactly is the problem when changing MTU? This works fine from
> what I can tell.

Following scenario leads to APP PANIC:

	1. mempool_1 = rte_mempool_create()
	2. rte_eth_rx_queue_setup(bond0, ..., mempool_1);
	3. rte_eth_dev_start(bond0);
	4. mempool_2 = rte_mempool_create();
	5. rte_eth_dev_stop(bond0);
	6. rte_eth_rx_queue_setup(bond0, ..., mempool_2);
	7. rte_eth_dev_start(bond0);
	* RX queues still use 'mempool_1' because reconfiguration doesn't affect them. *
	8. rte_mempool_free(mempool_1);
	9. On any rx operation we'll get PANIC because of using freed 'mempool_1':
	 PANIC in rte_mempool_get_ops():
	 assert "(ops_index >= 0) && (ops_index < RTE_MEMPOOL_MAX_OPS_IDX)" failed

You may just start OVS 2.6 with DPDK bonding device and attempt to change MTU via 'mtu_request'.
Bug is easily reproducible.

Best regards, Ilya Maximets.

> 
> On Wed, Sep 7, 2016 at 2:28 PM, Ilya Maximets <i.maximets at samsung.com> wrote:
>> This reverts commit 5b7bb2bda5519b7800f814df64d4e015282140e5.
>>
>> It is necessary to reconfigure all queues every time because configuration
>> can be changed.
>>
>> For example, if we're reconfiguring bonding device with new memory pool,
>> already configured queues will still use the old one. And if the old
>> mempool be freed, application likely will panic in attempt to use
>> freed mempool.
>>
>> This happens when we use the bonding device with OVS 2.6 while MTU
>> reconfiguration:
>>
>> PANIC in rte_mempool_get_ops():
>> assert "(ops_index >= 0) && (ops_index < RTE_MEMPOOL_MAX_OPS_IDX)" failed
>>
>> Cc: <stable at dpdk.org>
>> Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
>> ---
>>  drivers/net/bonding/rte_eth_bond_pmd.c | 10 ++--------
>>  1 file changed, 2 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
>> index b20a272..eb5b6d1 100644
>> --- a/drivers/net/bonding/rte_eth_bond_pmd.c
>> +++ b/drivers/net/bonding/rte_eth_bond_pmd.c
>> @@ -1305,8 +1305,6 @@ slave_configure(struct rte_eth_dev *bonded_eth_dev,
>>         struct bond_rx_queue *bd_rx_q;
>>         struct bond_tx_queue *bd_tx_q;
>>
>> -       uint16_t old_nb_tx_queues = slave_eth_dev->data->nb_tx_queues;
>> -       uint16_t old_nb_rx_queues = slave_eth_dev->data->nb_rx_queues;
>>         int errval;
>>         uint16_t q_id;
>>
>> @@ -1347,9 +1345,7 @@ slave_configure(struct rte_eth_dev *bonded_eth_dev,
>>         }
>>
>>         /* Setup Rx Queues */
>> -       /* Use existing queues, if any */
>> -       for (q_id = old_nb_rx_queues;
>> -            q_id < bonded_eth_dev->data->nb_rx_queues; q_id++) {
>> +       for (q_id = 0; q_id < bonded_eth_dev->data->nb_rx_queues; q_id++) {
>>                 bd_rx_q = (struct bond_rx_queue *)bonded_eth_dev->data->rx_queues[q_id];
>>
>>                 errval = rte_eth_rx_queue_setup(slave_eth_dev->data->port_id, q_id,
>> @@ -1365,9 +1361,7 @@ slave_configure(struct rte_eth_dev *bonded_eth_dev,
>>         }
>>
>>         /* Setup Tx Queues */
>> -       /* Use existing queues, if any */
>> -       for (q_id = old_nb_tx_queues;
>> -            q_id < bonded_eth_dev->data->nb_tx_queues; q_id++) {
>> +       for (q_id = 0; q_id < bonded_eth_dev->data->nb_tx_queues; q_id++) {
>>                 bd_tx_q = (struct bond_tx_queue *)bonded_eth_dev->data->tx_queues[q_id];
>>
>>                 errval = rte_eth_tx_queue_setup(slave_eth_dev->data->port_id, q_id,
>> --
>> 2.7.4
>>
> 
> 
> 


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