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https://github.com/openvswitch/ovs
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e1b1d06afd
In a future commit, we will make multiple bridges share a single backing datapath. Our simple mapping from datapath to OpenFlow port numbers won't work, since we'll want the same OpenFlow port numbers on different bridges. For example, the OFPP_LOCAL port must be the same on all bridges, but will have to be a different datapath port on the converged datapath. This commit makes it the responsibility of ofproto to assign the OpenFlow port numbers instead of doing a simple translation from the datapath ones. Signed-off-by: Justin Pettit <jpettit@nicira.com>
165 lines
6.6 KiB
C
165 lines
6.6 KiB
C
/*
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* Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ODP_UTIL_H
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#define ODP_UTIL_H 1
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <linux/openvswitch.h>
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#include "hash.h"
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#include "openflow/openflow.h"
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#include "util.h"
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struct ds;
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struct flow;
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struct nlattr;
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struct ofpbuf;
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struct simap;
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#define OVSP_NONE UINT32_MAX
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void format_odp_actions(struct ds *, const struct nlattr *odp_actions,
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size_t actions_len);
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int odp_actions_from_string(const char *, const struct simap *port_names,
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struct ofpbuf *odp_actions);
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/* The maximum number of bytes that odp_flow_key_from_flow() appends to a
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* buffer. This is the upper bound on the length of a nlattr-formatted flow
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* key that ovs-vswitchd fully understands.
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*
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* OVS doesn't insist that ovs-vswitchd and the datapath have exactly the same
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* idea of a flow, so therefore this value isn't necessarily an upper bound on
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* the length of a flow key that the datapath can pass to ovs-vswitchd.
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*
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* The longest nlattr-formatted flow key appended by odp_flow_key_from_flow()
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* would be:
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*
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* struct pad nl hdr total
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* ------ --- ------ -----
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* OVS_KEY_ATTR_PRIORITY 4 -- 4 8
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* OVS_KEY_ATTR_TUN_ID 8 -- 4 12
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* OVS_KEY_ATTR_IPV4_TUNNEL 24 -- 4 28
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* OVS_KEY_ATTR_IN_PORT 4 -- 4 8
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* OVS_KEY_ATTR_ETHERNET 12 -- 4 16
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* OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (outer VLAN ethertype)
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* OVS_KEY_ATTR_8021Q 4 -- 4 8
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* OVS_KEY_ATTR_ENCAP 0 -- 4 4 (VLAN encapsulation)
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* OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (inner VLAN ethertype)
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* OVS_KEY_ATTR_IPV6 40 -- 4 44
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* OVS_KEY_ATTR_ICMPV6 2 2 4 8
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* OVS_KEY_ATTR_ND 28 -- 4 32
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* -------------------------------------------------
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* total 184
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*
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* We include some slack space in case the calculation isn't quite right or we
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* add another field and forget to adjust this value.
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*/
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#define ODPUTIL_FLOW_KEY_BYTES 200
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/* A buffer with sufficient size and alignment to hold an nlattr-formatted flow
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* key. An array of "struct nlattr" might not, in theory, be sufficiently
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* aligned because it only contains 16-bit types. */
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struct odputil_keybuf {
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uint32_t keybuf[DIV_ROUND_UP(ODPUTIL_FLOW_KEY_BYTES, 4)];
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};
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void odp_flow_key_format(const struct nlattr *, size_t, struct ds *);
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int odp_flow_key_from_string(const char *s, const struct simap *port_names,
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struct ofpbuf *);
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void odp_flow_key_from_flow(struct ofpbuf *, const struct flow *,
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uint32_t odp_in_port);
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uint32_t odp_flow_key_hash(const struct nlattr *, size_t);
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/* How well a kernel-provided flow key (a sequence of OVS_KEY_ATTR_*
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* attributes) matches OVS userspace expectations.
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*
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* These values are arranged so that greater values are "more important" than
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* lesser ones. In particular, a single flow key can fit the descriptions for
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* both ODP_FIT_TOO_LITTLE and ODP_FIT_TOO_MUCH. Such a key is treated as
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* ODP_FIT_TOO_LITTLE. */
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enum odp_key_fitness {
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ODP_FIT_PERFECT, /* The key had exactly the fields we expect. */
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ODP_FIT_TOO_MUCH, /* The key had fields we don't understand. */
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ODP_FIT_TOO_LITTLE, /* The key lacked fields we expected to see. */
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ODP_FIT_ERROR, /* The key was invalid. */
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};
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enum odp_key_fitness odp_flow_key_to_flow(const struct nlattr *, size_t,
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struct flow *);
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const char *odp_key_fitness_to_string(enum odp_key_fitness);
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void commit_odp_actions(const struct flow *, struct flow *base,
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struct ofpbuf *odp_actions);
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/* ofproto-dpif interface.
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*
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* The following types and functions are logically part of ofproto-dpif.
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* ofproto-dpif puts values of these types into the flows that it installs in
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* the kernel datapath, though, so ovs-dpctl needs to interpret them so that
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* it can print flows in a more human-readable manner. */
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enum user_action_cookie_type {
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USER_ACTION_COOKIE_UNSPEC,
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USER_ACTION_COOKIE_SFLOW, /* Packet for sFlow sampling. */
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USER_ACTION_COOKIE_SLOW_PATH /* Userspace must process this flow. */
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};
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/* user_action_cookie is passed as argument to OVS_ACTION_ATTR_USERSPACE.
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* Since it is passed to kernel as u64, its size has to be 8 bytes. */
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union user_action_cookie {
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uint16_t type; /* enum user_action_cookie_type. */
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struct {
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uint16_t type; /* USER_ACTION_COOKIE_SFLOW. */
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ovs_be16 vlan_tci; /* Destination VLAN TCI. */
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uint32_t output; /* SFL_FLOW_SAMPLE_TYPE 'output' value. */
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} sflow;
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struct {
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uint16_t type; /* USER_ACTION_COOKIE_SLOW_PATH. */
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uint16_t unused;
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uint32_t reason; /* enum slow_path_reason. */
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} slow_path;
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};
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BUILD_ASSERT_DECL(sizeof(union user_action_cookie) == 8);
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size_t odp_put_userspace_action(uint32_t pid,
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const union user_action_cookie *,
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struct ofpbuf *odp_actions);
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/* Reasons why a subfacet might not be fast-pathable. */
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enum slow_path_reason {
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/* These reasons are mutually exclusive. */
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SLOW_CFM = 1 << 0, /* CFM packets need per-packet processing. */
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SLOW_LACP = 1 << 1, /* LACP packets need per-packet processing. */
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SLOW_STP = 1 << 2, /* STP packets need per-packet processing. */
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SLOW_IN_BAND = 1 << 3, /* In-band control needs every packet. */
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/* Mutually exclusive with SLOW_CFM, SLOW_LACP, SLOW_STP.
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* Could possibly appear with SLOW_IN_BAND. */
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SLOW_CONTROLLER = 1 << 4, /* Packets must go to OpenFlow controller. */
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/* This can appear on its own, or, theoretically at least, along with any
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* other combination of reasons. */
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SLOW_MATCH = 1 << 5, /* Datapath can't match specifically enough. */
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};
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#endif /* odp-util.h */
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