linux-kernel - Re: [net-next][PATCH v2 18/18] RDS: IB: add missing connection cache usage info

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Date:   Wed, 07 Dec 2016 10:55:31 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     santosh.shilimkar@...cle.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next][PATCH v2 18/18] RDS: IB: add missing connection
 cache usage info

From: Santosh Shilimkar <santosh.shilimkar@...cle.com>
Date: Tue,  6 Dec 2016 20:01:56 -0800

> rds-tools already support it.
> 
> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>
> ---
>  include/uapi/linux/rds.h | 1 +
>  net/rds/ib.c             | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/include/uapi/linux/rds.h b/include/uapi/linux/rds.h
> index 3833113..410ae3c 100644
> --- a/include/uapi/linux/rds.h
> +++ b/include/uapi/linux/rds.h
> @@ -183,6 +183,7 @@ struct rds_info_rdma_connection {
>  	uint32_t	max_send_sge;
>  	uint32_t	rdma_mr_max;
>  	uint32_t	rdma_mr_size;
> +	uint32_t	cache_allocs;
>  };
>  
>  /* RDS message Receive Path Latency points */

What level of compatability exists here?  If we run an old tool on a new
kernel, or a new tool on an old kernel, does it work properly?