[dpdk-dev] [PATCH V2] ethdev: add dev configured flag
Huisong Li
lihuisong at huawei.com
Wed Jul 7 04:55:53 CEST 2021
在 2021/7/6 16:36, Andrew Rybchenko 写道:
> @David, could you take a look at the ABI breakage warnings for
> the patch. May we ignore it since ABI looks backward
> compatible? Or should be marked as a minor change ABI
> which is backward compatible with DPDK_21?
>
> On 7/6/21 7:10 AM, Huisong Li wrote:
>> Currently, if dev_configure is not called or fails to be called, users
>> can still call dev_start successfully. So it is necessary to have a flag
>> which indicates whether the device is configured, to control whether
>> dev_start can be called and eliminate dependency on user invocation order.
>>
>> The flag stored in "struct rte_eth_dev_data" is more reasonable than
>> "enum rte_eth_dev_state". "enum rte_eth_dev_state" is private to the
>> primary and secondary processes, and can be independently controlled.
>> However, the secondary process does not make resource allocations and
>> does not call dev_configure(). These are done by the primary process
>> and can be obtained or used by the secondary process. So this patch
>> adds a "dev_configured" flag in "rte_eth_dev_data", like "dev_started".
>>
>> Signed-off-by: Huisong Li <lihuisong at huawei.com>
> Reviewed-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>
>
>> ---
>> v1 -> v2:
>> - adjusting the description of patch.
>>
>> ---
>> lib/ethdev/rte_ethdev.c | 16 ++++++++++++++++
>> lib/ethdev/rte_ethdev_core.h | 6 +++++-
>> 2 files changed, 21 insertions(+), 1 deletion(-)
>>
>> diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
>> index c607eab..6540432 100644
>> --- a/lib/ethdev/rte_ethdev.c
>> +++ b/lib/ethdev/rte_ethdev.c
>> @@ -1356,6 +1356,13 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
>> return -EBUSY;
>> }
>>
>> + /*
>> + * Ensure that "dev_configured" is always 0 each time prepare to do
>> + * dev_configure() to avoid any non-anticipated behaviour.
>> + * And set to 1 when dev_configure() is executed successfully.
>> + */
>> + dev->data->dev_configured = 0;
>> +
>> /* Store original config, as rollback required on failure */
>> memcpy(&orig_conf, &dev->data->dev_conf, sizeof(dev->data->dev_conf));
>>
>> @@ -1606,6 +1613,8 @@ 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;
>> +
> I think it should be inserted before the trace, since tracing
> is intentionally put close to return without any empty lines
> in between.
All right. Do I need to send a patch V3?
>> return 0;
>> reset_queues:
>> eth_dev_rx_queue_config(dev, 0);
>> @@ -1751,6 +1760,13 @@ 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..edf96de 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;
>> + /**< Indicates whether the device is configured.
>> + * 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];
>>
> .
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