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Date:   Mon, 31 Dec 2018 22:11:22 -0800
From:   Stephen Hemminger <>
To:     Matt Ellison <>
Subject: Re: [PATCH iproute2] ip: support for xfrm interfaces

On Fri, 28 Dec 2018 10:32:11 -0500
Matt Ellison <> wrote:

> Support for new (4.19+) xfrm virtual interfaces.
> Interfaces take a 'if_id' which is an interface id which can be set on
> an xfrm policy as its interface lookup key (XFRMA_IF_ID).
> Signed-off-by: Matt Ellison <>

Wanted to apply this, but it has lots of style issues.
The biggest one is indenting with spaces instead of tabs.
You can use the kernel checkpatch utility to ensure that it is correct.

Other changes needed:
1. For new code just use SPDX style license id, no need to quote GPL
/* SPDX-License-Identifier: GPL-2.0 */

2. Please make help function simpler:

static void xfrm_print_help(struct link_util *lu,
			    int argc, char **argv, FILE *f)
	fprintf(f, "Usage: ... %-4s dev PHYS_DEV [ if_id IF-ID ]\n", lu->id);
	fprintf(f, "\nWhere: IF-ID := { 0x0..0xffffffff }\n");

The code part looks ok, but you should also update the man page
and add test cases if possible.

Please fix and resubmit.

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