netdev - Re: [PATCH net] openvswitch: Fix for force/commit action failures

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Date:   Fri, 14 Jul 2017 11:42:34 -0700
From:   Joe Stringer <joe@....org>
To:     Greg Rose <gvrose8192@...il.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Pravin Shelar <pshelar@...ira.com>,
        ovs dev <dev@...nvswitch.org>
Subject: Re: [PATCH net] openvswitch: Fix for force/commit action failures

On 14 July 2017 at 09:10, Greg Rose <gvrose8192@...il.com> wrote:
> When there is an established connection in direction A->B, it is
> possible to receive a packet on port B which then executes
> ct(commit,force) without first performing ct() - ie, a lookup.
> In this case, we would expect that this packet can delete the existing
> entry so that we can commit a connection with direction B->A. However,
> currently we only perform a check in skb_nfct_cached() for whether
> OVS_CS_F_TRACKED is set and OVS_CS_F_INVALID is not set, ie that a
> lookup previously occurred. In the above scenario, a lookup has not
> occurred but we should still be able to statelessly look up the
> existing entry and potentially delete the entry if it is in the
> opposite direction.
>
> This patch extends the check to also hint that if the action has the
> force flag set, then we will lookup the existing entry so that the
> force check at the end of skb_nfct_cached has the ability to delete
> the connection.
>
> Fixes: dd41d330b03 ("openvswitch: Add force commit.")
> CC: Pravin Shelar <pshelar@...ira.com>
> CC: dev@...nvswitch.org
> Signed-off-by: Joe Stringer <joe@....org>
> Signed-off-by: Greg Rose <gvrose8192@...il.com>
> ---
>  net/openvswitch/conntrack.c | 50 +++++++++++++++++++++++++++++++--------------
>  1 file changed, 35 insertions(+), 15 deletions(-)
>
> diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
> index 08679eb..1260f2b 100644
> --- a/net/openvswitch/conntrack.c
> +++ b/net/openvswitch/conntrack.c
> @@ -629,6 +629,33 @@ static int handle_fragments(struct net *net, struct sw_flow_key *key,
>         return ct;
>  }
>
> +struct nf_conn *ovs_ct_executed(struct net *net,
> +                               const struct sw_flow_key *key,
> +                               const struct ovs_conntrack_info *info,
> +                               struct sk_buff *skb,
> +                               bool *ct_executed)

Actually, some compilers will report this new warning:
net/openvswitch/conntrack.c:632:16: warning: symbol 'ovs_ct_executed'
was not declared. Should it be static?

Could you make this function static and repost?

Thanks.