linux-kernel - Re: [PATCH net-next] net: ovs: fix ovs_drop

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Message-ID: <CAG=2xmMQZ2JgagfUUUF_Cod+3G5Yj=dfnKxEBz1A7Mpj51WR0g@mail.gmail.com>
Date: Tue, 20 Aug 2024 14:23:43 +0000
From: Adrián Moreno <amorenoz@...hat.com>
To: Menglong Dong <menglong8.dong@...il.com>
Cc: kuba@...nel.org, pshelar@....org, davem@...emloft.net, edumazet@...gle.com, 
	pabeni@...hat.com, netdev@...r.kernel.org, dev@...nvswitch.org, 
	linux-kernel@...r.kernel.org, Menglong Dong <dongml2@...natelecom.cn>
Subject: Re: [PATCH net-next] net: ovs: fix ovs_drop_reasons error

On Thu, Aug 15, 2024 at 08:22:45PM GMT, Menglong Dong wrote:
> I'm sure if I understand it correctly, but it seems that there is
> something wrong with ovs_drop_reasons.
>
> ovs_drop_reasons[0] is "OVS_DROP_LAST_ACTION", but
> OVS_DROP_LAST_ACTION == __OVS_DROP_REASON + 1, which means that
> ovs_drop_reasons[1] should be "OVS_DROP_LAST_ACTION".
>
> Fix this by initializing ovs_drop_reasons with index.
>
> Fixes: 9d802da40b7c ("net: openvswitch: add last-action drop reason")
> Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>

The patch looks good to me. Also, tested and verified that,
without the patch, adding flow to drop packets results in:

drop at: do_execute_actions+0x197/0xb20 [openvsw (0xffffffffc0db6f97)
origin: software
input port ifindex: 8
timestamp: Tue Aug 20 10:19:17 2024 859853461 nsec
protocol: 0x800
length: 98
original length: 98
drop reason: OVS_DROP_ACTION_ERROR

With the patch, the same results in:

drop at: do_execute_actions+0x197/0xb20 [openvsw (0xffffffffc0db6f97)
origin: software
input port ifindex: 8
timestamp: Tue Aug 20 10:16:13 2024 475856608 nsec
protocol: 0x800
length: 98
original length: 98
drop reason: OVS_DROP_LAST_ACTION

Tested-by: Adrian Moreno <amorenoz@...hat.com>
Reviewed-by: Adrian Moreno <amorenoz@...hat.com>