From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH iproute2 net-next v2 1/3] ip: add ip sr command to
 control SR-IPv6 internal structures
Date: Sun, 16 Apr 2017 10:22:27 -0700
Message-ID: <20170416102227.2356400e@xeon-e3>
References: <20170415101717.18730-1-david.lebrun@uclouvain.be>
        <20170415101717.18730-2-david.lebrun@uclouvain.be>
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To: David Lebrun <david.lebrun@uclouvain.be>
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Overall, this looks fine and applied.
I had to add seg6.h to include/linux since it was not there.

> +		switch (alg_id) {
> +		case SEG6_HMAC_ALGO_SHA1:
> +			algstr = "sha1";
> +			break;
> +		case SEG6_HMAC_ALGO_SHA256:
> +			algstr = "sha256";
> +			break;
> +		default:
> +			algstr = "<unknown>";
> +		}

You might want to consider having a table of HMAC algorithms so that get and set match. 
It seems likely that new  values will come.