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

[Jan Blunck]

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.

Cheers,
Jan

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
>