Enabling jumbo frames in f-stack

[yangsuli-netapp]

Hi,

It seems like frame size later than 1500, because in function ether_ifattach() the if_mtu size is statically set to ETHERMTU (which is 1518).

I think earlier there are plans to support larger MTU size (as mentioned in #239). Do you still plan to support it?

If not, could you let me know where I should change the f-stack code to enable configurable mtu size? We would like to modify f-stack to support that and possibly submit a patch. For now I am statically change the if_mtu value to ETHER_MAX_LEN_JUMBO, and call rte_eth_dev_set_mtu() afterwards. But this feels hacky and I am wondering if there is a way to do it through configuration (having ether_ifattach read the configuration value somewhere maybe?)

We really need this feature because in our workload jumbo frame enables a 30% performance boost.

Thanks!

Suli

[jfb8856606]

Support may be considered, but there is no time plan for the time being, and it may involve compatibility testing of various interfaces.

If you can support it, we very welcome to submit Pull request.

[wangchong2023]

ether_ifattach

你好

帧大小似乎晚于 1500，因为在函数 ether_ifattach（） 中，if_mtu大小静态设置为 ETHERMTU（即 1518）。

我认为早些时候有计划支持更大的 MTU 大小（如 #239 中所述）。您仍然打算支持它吗？

如果没有，您能否告诉我应该在何处更改 f-stack 代码以启用可配置的 mtu 大小？我们想修改 f-stack 以支持这一点，并可能提交一个补丁。现在，我将 if_mtu 值静态更改为 ETHER_MAX_LEN_JUMBO，然后调用 rte_eth_dev_set_mtu（）。但这感觉很 hacky，我想知道是否有办法通过配置来做到这一点（也许ether_ifattach某处读取配置值？

我们确实需要此功能，因为在我们的工作负载中，巨型帧可实现 30% 的性能提升。

谢谢！

苏丽

@jfb8856606 @yangsuli-netapp
"In ether_ifattach(), if_mtu size is statically set to ETHERMTU (i.e. 1518)" This is the initial default configuration. Ifconfig can modify mtu, and ultimately modify the if_mtu field. I wonder if anyone has tested it.