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datapath: Add support for tun_key to Open vSwitch datapath

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This is a first pass at providing a tun_key which can be
used as the basis for flow-based tunnelling. The
tun_key includes and replaces the tun_id in both struct
ovs_skb_cb and struct sw_tun_key.

This patch allows all existing tun_id behaviour to still work. Existing
users of tun_id are redirected to tun_key->tun_id to retain compatibility.
However, when the userspace code is updated to make use of the new
tun_key, the old behaviour will be deprecated and removed.

NOTE: With these changes, the tunneling code no longer assumes input and
output keys are symmetric.  If they are not, PMTUD needs to be disabled
for tunneling to work.

Signed-off-by: Kyle Mestery <kmestery@cisco.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Reviewed-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Kyle Mestery
2012-10-20 12:15:24 -07:00
committed by Pravin B Shelar
parent 4206b80f64
commit 356af50bc2
15 changed files with 488 additions and 172 deletions
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18
include/linux/openvswitch.h
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@@ -279,7 +279,8 @@ enum ovs_key_attr {
OVS_KEY_ATTR_ICMPV6, /* struct ovs_key_icmpv6 */
OVS_KEY_ATTR_ARP, /* struct ovs_key_arp */
OVS_KEY_ATTR_ND, /* struct ovs_key_nd */
OVS_KEY_ATTR_TUN_ID = 63, /* be64 tunnel ID */
OVS_KEY_ATTR_IPV4_TUNNEL = 62, /* struct ovs_key_ipv4_tunnel */
OVS_KEY_ATTR_TUN_ID = 63, /* be64 tunnel ID */
__OVS_KEY_ATTR_MAX
};
@@ -361,6 +362,21 @@ struct ovs_key_nd {
__u8 nd_tll[6];
};
/* Values for ovs_key_ipv4_tunnel->tun_flags */
#define OVS_FLOW_TNL_F_DONT_FRAGMENT (1 << 0)
#define OVS_FLOW_TNL_F_CSUM (1 << 1)
#define OVS_FLOW_TNL_F_KEY (1 << 2)
struct ovs_key_ipv4_tunnel {
__be64 tun_id;
__u32 tun_flags;
__be32 ipv4_src;
__be32 ipv4_dst;
__u8 ipv4_tos;
__u8 ipv4_ttl;
__u8 pad[2];
};
/**
* enum ovs_flow_attr - attributes for %OVS_FLOW_* commands.
* @OVS_FLOW_ATTR_KEY: Nested %OVS_KEY_ATTR_* attributes specifying the flow