[dpdk-dev] [RFC] lib/ethdev: add dev configured flag

[Huisong Li]

在 2021/6/14 23:37, Andrew Rybchenko 写道:
> Summary should start from "ethdev: "
>
> Don't forget to include all maintainers in Cc the next time.
> Just use --cc-cmd or --to-cmd options.
ok, thanks!
>
> Adding Thomas.
>
> On 5/8/21 11:00 AM, Huisong Li wrote:
>> Currently, if dev_configure is not invoked or fails to be invoked, users
>> can still invoke dev_start successfully. This patch adds a 
>> "dev_configured"
>> flag in "rte_eth_dev_data" to control whether dev_start can be invoked.
>
> In theory there is an indirect condition. If number of configured Tx
> *and* Rx queues is 0, device is not configured.

That's true. If the framework doesn't have this check, each driver needs 
to do this.

But it's a common thing, and it's probably more reasonable to put it in 
the ethdev layer.

>
> I have no strong opinion on the topic. Extra flag requires
> extra housekeeping. Indirect conditions are not always good
> and could be a subject to change.
>
>> Signed-off-by: Huisong Li <lihuisong at huawei.com>
>> ---
>>   lib/ethdev/rte_ethdev.c      | 11 +++++++++++
>>   lib/ethdev/rte_ethdev_core.h |  6 +++++-
>>   2 files changed, 16 insertions(+), 1 deletion(-)
>>
>> diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
>> index a187976..7d74b17 100644
>> --- a/lib/ethdev/rte_ethdev.c
>> +++ b/lib/ethdev/rte_ethdev.c
>> @@ -1604,6 +1604,8 @@ rte_eth_dev_configure(uint16_t port_id, 
>> uint16_t nb_rx_q, uint16_t nb_tx_q,
>>       }
>>         rte_ethdev_trace_configure(port_id, nb_rx_q, nb_tx_q, 
>> dev_conf, 0);
>> +    dev->data->dev_configured = 1;
>> +
>>       return 0;
>>   reset_queues:
>>       eth_dev_rx_queue_config(dev, 0);
>> @@ -1614,6 +1616,8 @@ rte_eth_dev_configure(uint16_t port_id, 
>> uint16_t nb_rx_q, uint16_t nb_tx_q,
>>           dev->data->mtu = old_mtu;
>>         rte_ethdev_trace_configure(port_id, nb_rx_q, nb_tx_q, 
>> dev_conf, ret);
>> +    dev->data->dev_configured = 0;
>> +
>>       return ret;
>>   }
>>   @@ -1749,6 +1753,13 @@ rte_eth_dev_start(uint16_t port_id)
>>         RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_start, -ENOTSUP);
>>   +    if (dev->data->dev_configured == 0) {
>> +        RTE_ETHDEV_LOG(INFO,
>> +            "Device with port_id=%"PRIu16" is not configured.\n",
>> +            port_id);
>> +        return -EINVAL;
>> +    }
>> +
>>       if (dev->data->dev_started != 0) {
>>           RTE_ETHDEV_LOG(INFO,
>>               "Device with port_id=%"PRIu16" already started\n",
>> diff --git a/lib/ethdev/rte_ethdev_core.h b/lib/ethdev/rte_ethdev_core.h
>> index 4679d94..b508769 100644
>> --- a/lib/ethdev/rte_ethdev_core.h
>> +++ b/lib/ethdev/rte_ethdev_core.h
>> @@ -167,7 +167,11 @@ struct rte_eth_dev_data {
>>           scattered_rx : 1,  /**< RX of scattered packets is ON(1) / 
>> OFF(0) */
>>           all_multicast : 1, /**< RX all multicast mode ON(1) / 
>> OFF(0). */
>>           dev_started : 1,   /**< Device state: STARTED(1) / 
>> STOPPED(0). */
>> -        lro         : 1;   /**< RX LRO is ON(1) / OFF(0) */
>> +        lro         : 1,  /**< RX LRO is ON(1) / OFF(0) */
>> +        dev_configured : 1;
>> +        /**< Device configuration state:
>> +         * CONFIGURED(1) / NOT CONFIGURED(0).
>> +         */
>>       uint8_t rx_queue_state[RTE_MAX_QUEUES_PER_PORT];
>>           /**< Queues state: HAIRPIN(2) / STARTED(1) / STOPPED(0). */
>>       uint8_t tx_queue_state[RTE_MAX_QUEUES_PER_PORT];
>>
>
> .