netdev - Re: [PATCH] ipv6: sr: update the struct ipv6_sr

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Message-Id: <20171114.213728.2022386575888884158.davem@davemloft.net>
Date:   Tue, 14 Nov 2017 21:37:28 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     amsalam20@...il.com
Cc:     david.lebrun@...ouvain.be, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: sr: update the struct ipv6_sr_hdr

From: Ahmed Abdelsalam <amsalam20@...il.com>
Date: Sun, 12 Nov 2017 21:37:01 +0100

> diff --git a/include/uapi/linux/seg6.h b/include/uapi/linux/seg6.h
> index 2f6fb0d..3f4b3ab 100644
> --- a/include/uapi/linux/seg6.h
> +++ b/include/uapi/linux/seg6.h
> @@ -26,9 +26,9 @@ struct ipv6_sr_hdr {
>  	__u8	hdrlen;
>  	__u8	type;
>  	__u8	segments_left;
> -	__u8	first_segment;
> +	__u8	last_entry;

This is user ABI and cannot be changed.

Sorry, folks should have considered these issues when the SR
changes were submitted.  This field must keep the name 'first_segment'
forever.