netdev - Re: [PATCH ipsec-next v4 05/18] xfrm: netlink: add config (netlink) options

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Date: Mon, 24 Jun 2024 17:29:30 +0200
From: Antony Antony <antony@...nome.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: [PATCH ipsec-next v4 05/18] xfrm: netlink: add config (netlink)
 options

On Mon, Jun 17, 2024 at 04:53:03PM -0400, Christian Hopps via Devel wrote:
> From: Christian Hopps <chopps@...n.net>
> 
> Add netlink options for configuring IP-TFS SAs.
> 
> Signed-off-by: Christian Hopps <chopps@...n.net>
> ---
>  include/uapi/linux/xfrm.h |  9 ++++++-
>  net/xfrm/xfrm_compat.c    | 10 ++++++--
>  net/xfrm/xfrm_user.c      | 52 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 68 insertions(+), 3 deletions(-)
> 
> diff --git a/include/uapi/linux/xfrm.h b/include/uapi/linux/xfrm.h
> index 18ceaba8486e..3bd1f810e079 100644
> --- a/include/uapi/linux/xfrm.h
> +++ b/include/uapi/linux/xfrm.h
> @@ -158,7 +158,8 @@ enum {
>  #define XFRM_MODE_ROUTEOPTIMIZATION 2
>  #define XFRM_MODE_IN_TRIGGER 3
>  #define XFRM_MODE_BEET 4
> -#define XFRM_MODE_MAX 5
> +#define XFRM_MODE_IPTFS 5
> +#define XFRM_MODE_MAX 6
>  
>  /* Netlink configuration messages.  */
>  enum {
> @@ -321,6 +322,12 @@ enum xfrm_attr_type_t {
>  	XFRMA_IF_ID,		/* __u32 */
>  	XFRMA_MTIMER_THRESH,	/* __u32 in seconds for input SA */
>  	XFRMA_SA_DIR,		/* __u8 */
> +	XFRMA_IPTFS_DROP_TIME,	/* __u32 in: usec to wait for next seq */
> +	XFRMA_IPTFS_REORDER_WINDOW, /* __u16 in: reorder window size */
> +	XFRMA_IPTFS_DONT_FRAG,	/* out: don't use fragmentation */
> +	XFRMA_IPTFS_INIT_DELAY,	/* __u32 out: initial packet wait delay (usec) */
> +	XFRMA_IPTFS_MAX_QSIZE,	/* __u32 out: max ingress queue size */

+	XFRMA_IPTFS_MAX_QSIZE,	/* __u32 out: max ingress queue size octets */

Add the units in comments? This would help the users.  The "struct 
xfrm_iptfs_config {" mentions it is octets. Adding it to uapi would help the 
users more. The defaults are not so obvious to find.