Re: [PATCHv2 1/1] net: rds: add service level support in rds-info

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From: Zhu Yanjun <yanjun.zhu@xxxxxxxxxx>
Date: Fri, 23 Aug 2019 21:04:16 -0400

> diff --git a/include/uapi/linux/rds.h b/include/uapi/linux/rds.h
> index fd6b5f6..cba368e 100644
> --- a/include/uapi/linux/rds.h
> +++ b/include/uapi/linux/rds.h
> @@ -250,6 +250,7 @@ struct rds_info_rdma_connection {
>  	__u32		rdma_mr_max;
>  	__u32		rdma_mr_size;
>  	__u8		tos;
> +	__u8		sl;
>  	__u32		cache_allocs;
>  };

I'm applying this, but I am once again severely disappointed in how
RDS development is being handled.

>From the Fixes: commit:

	Since rds.h in rds-tools is not related with the kernel rds.h,
	the change in kernel rds.h does not affect rds-tools.

This is the height of arrogance and shows a lack of understanding of
what user ABI requirements are all about.

It is possible for other userland components to be built by other
people, outside of your controlled eco-system and tools, that use
these interfaces.

And you cannot control that.

Therefore you cannot make arbitrary changes to UABI data strucures
just because the tool you use and maintain is not effected by it.

Please stop making these incredibly incompatible user interface
changes in the RDS stack.

I am, from this point forward, going to be extra strict on RDS stack
changes especially in this area.




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