netdev - Re: [PATCH net] vrf: Fix fast path output packet handling with async Netfilter rules

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Message-ID: <20201109154456.0d19e6c0@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 9 Nov 2020 15:44:56 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     David Ahern <dsahern@...nel.org>
Cc:     Martin Willi <martin@...ongswan.org>,
        Shrijeet Mukherjee <shrijeet@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org
Subject: Re: [PATCH net] vrf: Fix fast path output packet handling with
 async Netfilter rules

On Fri,  6 Nov 2020 08:30:30 +0100 Martin Willi wrote:
> VRF devices use an optimized direct path on output if a default qdisc
> is involved, calling Netfilter hooks directly. This path, however, does
> not consider Netfilter rules completing asynchronously, such as with
> NFQUEUE. The Netfilter okfn() is called for asynchronously accepted
> packets, but the VRF never passes that packet down the stack to send
> it out over the slave device. Using the slower redirect path for this
> seems not feasible, as we do not know beforehand if a Netfilter hook
> has asynchronously completing rules.
> 
> Fix the use of asynchronously completing Netfilter rules in OUTPUT and
> POSTROUTING by using a special completion function that additionally
> calls dst_output() to pass the packet down the stack. Also, slightly
> adjust the use of nf_reset_ct() so that is called in the asynchronous
> case, too.
> 
> Fixes: dcdd43c41e60 ("net: vrf: performance improvements for IPv4")
> Fixes: a9ec54d1b0cd ("net: vrf: performance improvements for IPv6")
> Signed-off-by: Martin Willi <martin@...ongswan.org>

David, can we get an ack?