linux-kernel - Re: [PATCH net-next v2 07/12] net: vxlan: add skb drop reasons to vxlan

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Message-ID: <20240830153634.GR1368797@kernel.org>
Date: Fri, 30 Aug 2024 16:36:34 +0100
From: Simon Horman <horms@...nel.org>
To: Menglong Dong <menglong8.dong@...il.com>
Cc: idosch@...dia.com, kuba@...nel.org, davem@...emloft.net,
	edumazet@...gle.com, pabeni@...hat.com, dsahern@...nel.org,
	dongml2@...natelecom.cn, amcohen@...dia.com, gnault@...hat.com,
	bpoirier@...dia.com, b.galvani@...il.com, razor@...ckwall.org,
	petrm@...dia.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 07/12] net: vxlan: add skb drop reasons to
 vxlan_rcv()

On Fri, Aug 30, 2024 at 09:59:56AM +0800, Menglong Dong wrote:
> Introduce skb drop reasons to the function vxlan_rcv(). Following new
> vxlan drop reasons are added:
> 
>   VXLAN_DROP_INVALID_HDR
>   VXLAN_DROP_VNI_NOT_FOUND
> 
> And Following core skb drop reason is added:
> 
>   SKB_DROP_REASON_IP_TUNNEL_ECN
> 
> Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
> ---
> v2:
> - rename the drop reasons, as Ido advised.
> - document the drop reasons
> ---
>  drivers/net/vxlan/drop.h       | 10 ++++++++++
>  drivers/net/vxlan/vxlan_core.c | 35 +++++++++++++++++++++++++---------
>  include/net/dropreason-core.h  |  6 ++++++
>  3 files changed, 42 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/vxlan/drop.h b/drivers/net/vxlan/drop.h
> index 876b4a9de92f..416532633881 100644
> --- a/drivers/net/vxlan/drop.h
> +++ b/drivers/net/vxlan/drop.h
> @@ -11,6 +11,8 @@
>  #define VXLAN_DROP_REASONS(R)			\
>  	R(VXLAN_DROP_INVALID_SMAC)		\
>  	R(VXLAN_DROP_ENTRY_EXISTS)		\
> +	R(VXLAN_DROP_INVALID_HDR)		\
> +	R(VXLAN_DROP_VNI_NOT_FOUND)		\
>  	/* deliberate comment for trailing \ */
>  
>  enum vxlan_drop_reason {
> @@ -23,6 +25,14 @@ enum vxlan_drop_reason {
>  	 * one pointing to a nexthop
>  	 */
>  	VXLAN_DROP_ENTRY_EXISTS,
> +	/**
> +	 * @VXLAN_DROP_INVALID_HDR: the vxlan header is invalid, such as:

> +	 * 1) the reserved fields are not zero
> +	 * 2) the "I" flag is not set

Maybe:
	 * ...: VXLAN header is invalid. E.g.:
	 * 1) reserved fields are not zero
	 * 2) "I" flag is not set

> +	 */
> +	VXLAN_DROP_INVALID_HDR,
> +	/** @VXLAN_DROP_VNI_NOT_FOUND: no vxlan device found for the vni */

Maybe: no VXLAN device found for VNI

> +	VXLAN_DROP_VNI_NOT_FOUND,
>  };

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