netdev - Re: [PATCH net-next] net-core: add InMacErrors counter

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Message-ID: <20220121194057.17079951@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Fri, 21 Jan 2022 19:40:57 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jeffrey Ji <jeffreyjilinux@...il.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Brian Vazquez <brianvv@...gle.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        jeffreyji <jeffreyji@...gle.com>
Subject: Re: [PATCH net-next] net-core: add InMacErrors counter

On Sat, 22 Jan 2022 00:03:01 +0000 Jeffrey Ji wrote:
> From: jeffreyji <jeffreyji@...gle.com>
> 
> Increment InMacErrors counter when packet dropped due to incorrect dest
> MAC addr.
> 
> example output from nstat:
> \~# nstat -z "*InMac*"
> \#kernel
> Ip6InMacErrors                  0                  0.0
> IpExtInMacErrors                1                  0.0
> 
> Tested: Created 2 netns, sent 1 packet using trafgen from 1 to the other
> with "{eth(daddr=$INCORRECT_MAC...}", verified that nstat showed the
> counter was incremented.
> 
> Signed-off-by: jeffreyji <jeffreyji@...gle.com>

How about we use the new kfree_skb_reason() instead to avoid allocating
per-netns memory the stats?