netdev - Re: [PATCH 5/6] openvswitch: Allow for any level of nesting in flow attributes

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Date:	Mon, 12 Jan 2015 11:41:32 -0800
From:	Jesse Gross <jesse@...ira.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	David Miller <davem@...emloft.net>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Pravin Shelar <pshelar@...ira.com>,
	Tom Herbert <therbert@...gle.com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 5/6] openvswitch: Allow for any level of nesting in flow attributes

On Mon, Jan 12, 2015 at 4:26 AM, Thomas Graf <tgraf@...g.ch> wrote:
> diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
> index 8980d32..457ccf3 100644
> --- a/net/openvswitch/flow_netlink.c
> +++ b/net/openvswitch/flow_netlink.c
> +static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
> +       [OVS_TUNNEL_KEY_ATTR_ID]            = { .len = sizeof(u64) },
> +       [OVS_TUNNEL_KEY_ATTR_IPV4_SRC]      = { .len = sizeof(u32) },
> +       [OVS_TUNNEL_KEY_ATTR_IPV4_DST]      = { .len = sizeof(u32) },
> +       [OVS_TUNNEL_KEY_ATTR_TOS]           = { .len = 1 },
> +       [OVS_TUNNEL_KEY_ATTR_TTL]           = { .len = 1 },
> +       [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = { .len = 0 },
> +       [OVS_TUNNEL_KEY_ATTR_CSUM]          = { .len = 0 },
> +       [OVS_TUNNEL_KEY_ATTR_TP_SRC]        = { .len = sizeof(u16) },
> +       [OVS_TUNNEL_KEY_ATTR_TP_DST]        = { .len = sizeof(u16) },
> +       [OVS_TUNNEL_KEY_ATTR_OAM]           = { .len = 0 },
> +       [OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS]   = { .len = OVS_ATTR_NESTED },
> +};

Geneve isn't really nested - maybe we should break it out into a
separate name? OVS_ATTR_VARIABLE? We shouldn't really try to traverse
it as netlink attributes anyways.

> +static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
> +       [OVS_KEY_ATTR_ENCAP]     = { .len = OVS_ATTR_NESTED },

This is not new but I think that encap isn't really handled correctly.
In theory, there could be multiple levels of nesting here (either
another encap or some other element) but there's no 'next' link.
However, I don't believe the situation arises today.
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