2 * Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
24 #include <linux/openvswitch.h>
26 #include "openflow/openflow.h"
35 #define OVSP_NONE ((uint16_t) -1)
37 static inline uint16_t
38 ofp_port_to_odp_port(uint16_t ofp_port)
50 static inline uint16_t
51 odp_port_to_ofp_port(uint16_t odp_port)
63 void format_odp_actions(struct ds *, const struct nlattr *odp_actions,
65 int odp_actions_from_string(const char *, const struct simap *port_names,
66 struct ofpbuf *odp_actions);
68 /* The maximum number of bytes that odp_flow_key_from_flow() appends to a
69 * buffer. This is the upper bound on the length of a nlattr-formatted flow
70 * key that ovs-vswitchd fully understands.
72 * OVS doesn't insist that ovs-vswitchd and the datapath have exactly the same
73 * idea of a flow, so therefore this value isn't necessarily an upper bound on
74 * the length of a flow key that the datapath can pass to ovs-vswitchd.
76 * The longest nlattr-formatted flow key appended by odp_flow_key_from_flow()
79 * struct pad nl hdr total
80 * ------ --- ------ -----
81 * OVS_KEY_ATTR_PRIORITY 4 -- 4 8
82 * OVS_KEY_ATTR_TUN_ID 8 -- 4 12
83 * OVS_KEY_ATTR_IN_PORT 4 -- 4 8
84 * OVS_KEY_ATTR_ETHERNET 12 -- 4 16
85 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (outer VLAN ethertype)
86 * OVS_KEY_ATTR_8021Q 4 -- 4 8
87 * OVS_KEY_ATTR_ENCAP 0 -- 4 4 (VLAN encapsulation)
88 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (inner VLAN ethertype)
89 * OVS_KEY_ATTR_IPV6 40 -- 4 44
90 * OVS_KEY_ATTR_ICMPV6 2 2 4 8
91 * OVS_KEY_ATTR_ND 28 -- 4 32
92 * -------------------------------------------------
95 * We include some slack space in case the calculation isn't quite right or we
96 * add another field and forget to adjust this value.
98 #define ODPUTIL_FLOW_KEY_BYTES 200
100 /* A buffer with sufficient size and alignment to hold an nlattr-formatted flow
101 * key. An array of "struct nlattr" might not, in theory, be sufficiently
102 * aligned because it only contains 16-bit types. */
103 struct odputil_keybuf {
104 uint32_t keybuf[DIV_ROUND_UP(ODPUTIL_FLOW_KEY_BYTES, 4)];
107 void odp_flow_key_format(const struct nlattr *, size_t, struct ds *);
108 int odp_flow_key_from_string(const char *s, const struct simap *port_names,
111 void odp_flow_key_from_flow(struct ofpbuf *, const struct flow *);
113 uint32_t odp_flow_key_hash(const struct nlattr *, size_t);
115 /* How well a kernel-provided flow key (a sequence of OVS_KEY_ATTR_*
116 * attributes) matches OVS userspace expectations.
118 * These values are arranged so that greater values are "more important" than
119 * lesser ones. In particular, a single flow key can fit the descriptions for
120 * both ODP_FIT_TOO_LITTLE and ODP_FIT_TOO_MUCH. Such a key is treated as
121 * ODP_FIT_TOO_LITTLE. */
122 enum odp_key_fitness {
123 ODP_FIT_PERFECT, /* The key had exactly the fields we expect. */
124 ODP_FIT_TOO_MUCH, /* The key had fields we don't understand. */
125 ODP_FIT_TOO_LITTLE, /* The key lacked fields we expected to see. */
126 ODP_FIT_ERROR, /* The key was invalid. */
128 enum odp_key_fitness odp_flow_key_to_flow(const struct nlattr *, size_t,
130 const char *odp_key_fitness_to_string(enum odp_key_fitness);
132 void commit_odp_actions(const struct flow *, struct flow *base,
133 struct ofpbuf *odp_actions);
135 /* ofproto-dpif interface.
137 * The following types and functions are logically part of ofproto-dpif.
138 * ofproto-dpif puts values of these types into the flows that it installs in
139 * the kernel datapath, though, so ovs-dpctl needs to interpret them so that
140 * it can print flows in a more human-readable manner. */
142 enum user_action_cookie_type {
143 USER_ACTION_COOKIE_UNSPEC,
144 USER_ACTION_COOKIE_SFLOW, /* Packet for sFlow sampling. */
145 USER_ACTION_COOKIE_SLOW_PATH /* Userspace must process this flow. */
148 /* user_action_cookie is passed as argument to OVS_ACTION_ATTR_USERSPACE.
149 * Since it is passed to kernel as u64, its size has to be 8 bytes. */
150 union user_action_cookie {
151 uint16_t type; /* enum user_action_cookie_type. */
154 uint16_t type; /* USER_ACTION_COOKIE_SFLOW. */
155 ovs_be16 vlan_tci; /* Destination VLAN TCI. */
156 uint32_t output; /* SFL_FLOW_SAMPLE_TYPE 'output' value. */
160 uint16_t type; /* USER_ACTION_COOKIE_SLOW_PATH. */
162 uint32_t reason; /* enum slow_path_reason. */
165 BUILD_ASSERT_DECL(sizeof(union user_action_cookie) == 8);
167 size_t odp_put_userspace_action(uint32_t pid,
168 const union user_action_cookie *,
169 struct ofpbuf *odp_actions);
171 /* Reasons why a subfacet might not be fast-pathable. */
172 enum slow_path_reason {
173 /* These reasons are mutually exclusive. */
174 SLOW_CFM = 1 << 0, /* CFM packets need per-packet processing. */
175 SLOW_LACP = 1 << 1, /* LACP packets need per-packet processing. */
176 SLOW_STP = 1 << 2, /* STP packets need per-packet processing. */
177 SLOW_IN_BAND = 1 << 3, /* In-band control needs every packet. */
179 /* Mutually exclusive with SLOW_CFM, SLOW_LACP, SLOW_STP.
180 * Could possibly appear with SLOW_IN_BAND. */
181 SLOW_CONTROLLER = 1 << 4, /* Packets must go to OpenFlow controller. */
183 /* This can appear on its own, or, theoretically at least, along with any
184 * other combination of reasons. */
185 SLOW_MATCH = 1 << 5, /* Datapath can't match specifically enough. */
188 #endif /* odp-util.h */