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

[Huisong Li]

在 2021/7/2 21:23, Ananyev, Konstantin 写道:
>
>> On 7/2/2021 12:08 PM, Andrew Rybchenko wrote:
>>> @Thomas, @Ferruh, I tend to accept it (with minor style fixes),
>>> but I need your opinion on it before doing it.
>>>
>> I guess we were relying on the user/application to have correct order up until
>> now, it can be good to add this into the API. OK to add it for me.
> I don't know do we really need that flag in dev_data or not,
> but if we do - probably better to reset it at dev_confgure() straight before
> we start to make any changes in dev_data.

Sorry, I don't get you. Some fields in rte_eth_dev_data are initialized 
firstly in the probe phase.

Do you mean to add clear this flag at the beginning of dev_configure()?

> That way SP can also figure out that device is not configured yet, etc.
>
>>> Thanks,
>>> Andrew.
>>>
>>> On 6/29/21 5:27 AM, Huisong Li wrote:
>>>> 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;
>>>>>> +
>> I would move it before trace function.
>>
>>>>>>        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);
>> Should log type be warning/error?
>>
>>>>>> +        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];
>>>>>>
>>>>> .