[PATCH] ethdev: fix push new event
lihuisong (C)
lihuisong at huawei.com
Sat May 28 10:53:28 CEST 2022
在 2022/5/23 22:36, Thomas Monjalon 写道:
> 23/05/2022 11:51, David Marchand:
>> On Sat, May 21, 2022 at 8:57 AM Min Hu (Connor)<humin29 at huawei.com> wrote:
>>> From: Huisong Li<lihuisong at huawei.com>
>>>
>>> The 'state' in struct rte_eth_dev may be used to update some information
>>> when app receive these events. For example, when app receives a new event,
>>> app may get the socket id of this port by calling rte_eth_dev_socket_id to
>>> setup the attached port. The 'state' is used in rte_eth_dev_socket_id.
>>>
>>> If the state isn't modified to RTE_ETH_DEV_ATTACHED before pushing the new
>>> event, app will get the socket id failed. So this patch moves pushing event
>>> operation after the state updated.
>>>
>>> Fixes: 99a2dd955fba ("lib: remove librte_ prefix from directory names")
>> A patch moving code is unlikely to be at fault.
>>
>>
>> Looking at the patch which moved those notifications in this point of
>> the code, the state update was pushed after the notification on
>> purpose.
>> See be8cd210379a ("ethdev: fix port probing notification")
>>
>> ethdev: fix port probing notification
>>
>> The new device was notified as soon as it was allocated.
>> It leads to use a device which is not yet initialized.
>>
>> The notification must be published after the initialization is done
>> by the PMD, but before the state is changed, in order to let
>> notified entities taking ownership before general availability.
>>
>>
>> Do we need an intermediate state during probing?
> Possibly. Currently we have only 3 states:
> RTE_ETH_DEV_UNUSED
> RTE_ETH_DEV_ATTACHED
> RTE_ETH_DEV_REMOVED
>
> We may add RTE_ETH_DEV_ALLOCATED just before calling
> rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_NEW, NULL);
> Then we would need to check against RTE_ETH_DEV_ALLOCATED
> in some ethdev functions.
>
Hi, Thomas,
Do you mean that we need to modify some funcions like following?
int rte_eth_dev_is_valid_port(uint16_t port_id)
{
if (port_id >= RTE_MAX_ETHPORTS ||
(rte_eth_devices[port_id].state != *RTE_ETH_DEV_ALLOCATED*))
return 0;
else
return 1;
}
uint16_t rte_eth_find_next(uint16_t port_id)
{
while (port_id < RTE_MAX_ETHPORTS &&
rte_eth_devices[port_id].state != *RTE_ETH_DEV_ALLOCATED*)
port_id++;
if (port_id >= RTE_MAX_ETHPORTS)
return RTE_MAX_ETHPORTS;
return port_id;
}
>
> .
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