[dpdk-dev] [PATCH] ethdev: fix data type for port id

Andrew Rybchenko andrew.rybchenko at oktetlabs.ru
Mon Oct 26 13:33:12 CET 2020


On 10/26/20 3:29 PM, Thomas Monjalon wrote:
> 26/10/2020 13:24, wangyunjian:
>> From: Yunjian Wang <wangyunjian at huawei.com>
>>
>> The ethdev port id should be 16 bits now. This patch fixes the data
>> type of the variable for 'pid', changing from uint32_t to uint16_t.
>>
>> Fixes: 5b7ba31148a8 ("ethdev: add port ownership")
> 
> It was 32-bit on purpose, to avoid overflow in this loop:
> 	for (pid = 0; pid < RTE_MAX_ETHPORTS; pid++)
> 
> It is now replaced by RTE_ETH_FOREACH_VALID_DEV,
> but I wonder whether we still have this theoritical overflow risk.
> If yes, we should change more variables to 32-bit.

Ah, it is too tricky. May be it is better to ensure that
RTE_MAX_ETHPORTS is less or equal to UINT16_MAX?




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