Re: Determining vendor and model from the port ID

["Lukáš Šišmiš" <sismis@cesnet.cz>]

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On 3/25/25 21:07, Stephen Hemminger wrote:
> On Tue, 25 Mar 2025 20:32:53 +0700
> Lukáš Šišmiš <sismis@cesnet.cz> wrote:
>
>> Hello all,
>>
>> I am trying to determine what is the vendor and model of the port ID
>> that I am interacting with but all references lead me to an obsolete API.
>>
>> The goal is to execute specific code only when I am dealing with
>> Mellanox ConnectX-4-family cards. Longer explanation below.
>>
>> I would like to access "struct rte_pci_id" but it always seems hidden
>> only on the driver level.
>>
>> Is there any way how to approach this?
>>
>>
>> Longer explanation of the problem:
>>
>> In https://github.com/OISF/suricata/pull/12654 I am using dev_info to
>> get the maximum number of allowed TX descriptors for the port that is
>> advertised by the PMD. But when I set the actual number of TX
>> descriptors then the driver complains "minimal data inline requirements
>> (18) are not satisfied (12) on port 0, try the smaller Tx queue size
>> (32768)". However, this problem occurs only on ConnectX-4 family and not
>> on CX5/6/7 (that's why I cannot limit this to just mlx5 PMD).
>>
>> Alternatively, can this be fixed/addressed directly in the MLX5 PMD?
>> MLX5 PMD needs to advertise 16384 TX descriptors as the maximum only for
>> ConnectX-4 family.
>> (Putting Darius, Viacheslav in the loop, please reassign if needed)
>>
>> Thank you.
>>
>> Best,
>>
>> Lukas
>>
> The device name contains the PCI id.
> Use rte_eth_dev_get_name_by_port(uint16_t port_id, char *name);

Not really, it also confused me but PCI ID is not the same as PCI 
address. PCI address changes as the system desires whereas PCI ID should 
be device-specific information that is the same across all instances of 
the same model. lspci -nn is a good example, look at the trailing 
numbers, the first one is the vendor ID and the second one is model number.


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