netdev - Re: [RFC ipsec-next 8/8] iptfs: impl: add new iptfs xfrm mode impl

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Message-ID: <20231112100256.GH705326@kernel.org>
Date: Sun, 12 Nov 2023 10:02:56 +0000
From: Simon Horman <horms@...nel.org>
To: Christian Hopps <chopps@...pps.org>
Cc: devel@...ux-ipsec.org, Steffen Klassert <steffen.klassert@...unet.com>,
	netdev@...r.kernel.org, Christian Hopps <chopps@...n.net>
Subject: Re: [RFC ipsec-next 8/8] iptfs: impl: add new iptfs xfrm mode impl

On Fri, Nov 10, 2023 at 06:37:19AM -0500, Christian Hopps wrote:
> From: Christian Hopps <chopps@...n.net>
> 
> Add a new xfrm mode implementing AggFrag/IP-TFS from RFC9347.
> 
> This utilizes the new xfrm_mode_cbs to implement demand-driven IP-TFS
> functionality. This functionality can be used to increase bandwidth
> utilization through small packet aggregation, as well as help solve PMTU
> issues through it's efficient use of fragmentation.
> 
> Link: https://www.rfc-editor.org/rfc/rfc9347.txt
> 
> Signed-off-by: Christian Hopps <chopps@...n.net>

...

> diff --git a/net/xfrm/xfrm_iptfs.c b/net/xfrm/xfrm_iptfs.c

...

> +/* ================= */
> +/* Utility Functions */
> +/* ================= */
> +
> +static inline u32 __trace_ip_proto(struct iphdr *iph)
> +{
> +	if (iph->version == 4)
> +		return iph->protocol;
> +	return ((struct ipv6hdr *)iph)->nexthdr;
> +}

Hi Christian,

please don't use inline in .c files unless there is a demonstrable reason
to do so. Rather, please leave inlining up to the compiler.

...