X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fopenflow%2Fnicira-ext.h;h=4fc2049d15d19a9e12d5e6e6f80768b1bb864245;hb=e1152397ae5307cd7a082361ab81fa73076368f5;hp=2f46311f03dbbeef1fce54e3f5506998162e7a80;hpb=ff0b06eef1d7044df8220ccbed718a6fae55fc10;p=openvswitch diff --git a/include/openflow/nicira-ext.h b/include/openflow/nicira-ext.h index 2f46311f..4fc2049d 100644 --- a/include/openflow/nicira-ext.h +++ b/include/openflow/nicira-ext.h @@ -73,66 +73,26 @@ struct nx_vendor_error { struct nicira_header { struct ofp_header header; ovs_be32 vendor; /* NX_VENDOR_ID. */ - ovs_be32 subtype; /* One of NXT_* below. */ + ovs_be32 subtype; /* See the NXT numbers in ofp-msgs.h. */ }; OFP_ASSERT(sizeof(struct nicira_header) == 16); -/* Values for the 'subtype' member of struct nicira_header. */ -enum nicira_type { - /* No longer used. */ - NXT_STATUS_REQUEST__OBSOLETE = 0, - NXT_STATUS_REPLY__OBSOLETE = 1, - NXT_ACT_SET_CONFIG__OBSOLETE = 2, - NXT_ACT_GET_CONFIG__OBSOLETE = 3, - NXT_COMMAND_REQUEST__OBSOLETE = 4, - NXT_COMMAND_REPLY__OBSOLETE = 5, - NXT_FLOW_END_CONFIG__OBSOLETE = 6, - NXT_FLOW_END__OBSOLETE = 7, - NXT_MGMT__OBSOLETE = 8, - NXT_TUN_ID_FROM_COOKIE__OBSOLETE = 9, - - /* Controller role support. The request body is struct nx_role_request. - * The reply echos the request. */ - NXT_ROLE_REQUEST = 10, - NXT_ROLE_REPLY = 11, - - /* Flexible flow specification (aka NXM = Nicira Extended Match). */ - NXT_SET_FLOW_FORMAT = 12, /* Set flow format. */ - NXT_FLOW_MOD = 13, /* Analogous to OFPT_FLOW_MOD. */ - NXT_FLOW_REMOVED = 14, /* Analogous to OFPT_FLOW_REMOVED. */ - - /* Use the upper 8 bits of the 'command' member in struct ofp_flow_mod to - * designate the table to which a flow is to be added? See the big comment - * on struct nx_flow_mod_table_id for more information. */ - NXT_FLOW_MOD_TABLE_ID = 15, - - /* Alternative PACKET_IN message formats. */ - NXT_SET_PACKET_IN_FORMAT = 16, /* Set Packet In format. */ - NXT_PACKET_IN = 17, /* Nicira Packet In. */ - - /* Are the idle_age and hard_age members in struct nx_flow_stats supported? - * If so, the switch does not reply to this message (which consists only of - * a "struct nicira_header"). If not, the switch sends an error reply. */ - NXT_FLOW_AGE = 18, - - NXT_SET_ASYNC_CONFIG = 19, /* struct nx_async_config. */ - NXT_SET_CONTROLLER_ID = 20, /* struct nx_controller_id. */ -}; - -/* Header for Nicira vendor stats request and reply messages. */ -struct nicira_stats_msg { - struct ofp_vendor_stats_msg vsm; /* Vendor NX_VENDOR_ID. */ +/* Header for Nicira vendor stats request and reply messages in OpenFlow + * 1.0. */ +struct nicira10_stats_msg { + struct ofp10_vendor_stats_msg vsm; /* Vendor NX_VENDOR_ID. */ ovs_be32 subtype; /* One of NXST_* below. */ uint8_t pad[4]; /* Align to 64-bits. */ }; -OFP_ASSERT(sizeof(struct nicira_stats_msg) == 24); +OFP_ASSERT(sizeof(struct nicira10_stats_msg) == 24); -/* Values for the 'subtype' member of struct nicira_stats_msg. */ -enum nicira_stats_type { - /* Flexible flow specification (aka NXM = Nicira Extended Match). */ - NXST_FLOW, /* Analogous to OFPST_FLOW. */ - NXST_AGGREGATE /* Analogous to OFPST_AGGREGATE. */ +/* Header for Nicira vendor stats request and reply messages in OpenFlow + * 1.1. */ +struct nicira11_stats_msg { + struct ofp11_vendor_stats_msg vsm; /* Vendor NX_VENDOR_ID. */ + ovs_be32 subtype; /* One of NXST_* below. */ }; +OFP_ASSERT(sizeof(struct nicira11_stats_msg) == 24); /* Fields to use when hashing flows. */ enum nx_hash_fields { @@ -158,7 +118,7 @@ enum nx_hash_fields { * instead of having the switch decide which table is most appropriate as * required by OpenFlow 1.0. By default, the extension is disabled. * - * When this feature is enabled, Open vSwitch treats struct ofp_flow_mod's + * When this feature is enabled, Open vSwitch treats struct ofp10_flow_mod's * 16-bit 'command' member as two separate fields. The upper 8 bits are used * as the table ID, the lower 8 bits specify the command as usual. A table ID * of 0xff is treated like a wildcarded table ID. @@ -192,13 +152,10 @@ enum nx_hash_fields { * table match, then none is modified or deleted. */ struct nx_flow_mod_table_id { - struct ofp_header header; - ovs_be32 vendor; /* NX_VENDOR_ID. */ - ovs_be32 subtype; /* NXT_FLOW_MOD_TABLE_ID. */ uint8_t set; /* Nonzero to enable, zero to disable. */ uint8_t pad[7]; }; -OFP_ASSERT(sizeof(struct nx_flow_mod_table_id) == 24); +OFP_ASSERT(sizeof(struct nx_flow_mod_table_id) == 8); enum nx_packet_in_format { NXPIF_OPENFLOW10 = 0, /* Standard OpenFlow 1.0 compatible. */ @@ -207,10 +164,9 @@ enum nx_packet_in_format { /* NXT_SET_PACKET_IN_FORMAT request. */ struct nx_set_packet_in_format { - struct nicira_header nxh; ovs_be32 format; /* One of NXPIF_*. */ }; -OFP_ASSERT(sizeof(struct nx_set_packet_in_format) == 20); +OFP_ASSERT(sizeof(struct nx_set_packet_in_format) == 4); /* NXT_PACKET_IN (analogous to OFPT_PACKET_IN). * @@ -237,7 +193,6 @@ OFP_ASSERT(sizeof(struct nx_set_packet_in_format) == 20); * The 'cookie' and 'table_id' fields have no meaning when 'reason' is * OFPR_NO_MATCH. In this case they should be set to 0. */ struct nx_packet_in { - struct nicira_header nxh; ovs_be32 buffer_id; /* ID assigned by datapath. */ ovs_be16 total_len; /* Full length of frame. */ uint8_t reason; /* Reason packet is sent (one of OFPR_*). */ @@ -259,7 +214,7 @@ struct nx_packet_in { /* uint8_t pad[2]; */ /* Align to 64 bit + 16 bit. */ /* uint8_t data[0]; */ /* Ethernet frame. */ }; -OFP_ASSERT(sizeof(struct nx_packet_in) == 40); +OFP_ASSERT(sizeof(struct nx_packet_in) == 24); /* Configures the "role" of the sending controller. The default role is: * @@ -281,10 +236,9 @@ OFP_ASSERT(sizeof(struct nx_packet_in) == 40); * messages, but they do receive OFPT_PORT_STATUS messages. */ struct nx_role_request { - struct nicira_header nxh; ovs_be32 role; /* One of NX_ROLE_*. */ }; -OFP_ASSERT(sizeof(struct nx_role_request) == 20); +OFP_ASSERT(sizeof(struct nx_role_request) == 4); enum nx_role { NX_ROLE_OTHER, /* Default role, full access. */ @@ -305,14 +259,16 @@ enum nx_role { * with value 1<<2 == 4 in port_status_mask[1] determines whether the * controller will receive OFPT_PORT_STATUS messages with reason OFPPR_MODIFY * (value 2) when the controller has a "slave" role. + * + * As a side effect, for service controllers, this message changes the + * miss_send_len from default of zero to OFP_DEFAULT_MISS_SEND_LEN (128). */ struct nx_async_config { - struct nicira_header nxh; ovs_be32 packet_in_mask[2]; /* Bitmasks of OFPR_* values. */ ovs_be32 port_status_mask[2]; /* Bitmasks of OFPRR_* values. */ ovs_be32 flow_removed_mask[2]; /* Bitmasks of OFPPR_* values. */ }; -OFP_ASSERT(sizeof(struct nx_async_config) == 40); +OFP_ASSERT(sizeof(struct nx_async_config) == 24); /* Nicira vendor flow actions. */ @@ -426,7 +382,7 @@ OFP_ASSERT(sizeof(struct nx_action_set_tunnel) == 16); * Sets the encapsulating tunnel ID to a 64-bit value. */ struct nx_action_set_tunnel64 { ovs_be16 type; /* OFPAT_VENDOR. */ - ovs_be16 len; /* Length is 16. */ + ovs_be16 len; /* Length is 24. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_SET_TUNNEL64. */ uint8_t pad[6]; @@ -540,7 +496,7 @@ OFP_ASSERT(sizeof(struct nx_action_pop_queue) == 16); */ struct nx_action_reg_move { ovs_be16 type; /* OFPAT_VENDOR. */ - ovs_be16 len; /* Length is 16. */ + ovs_be16 len; /* Length is 24. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_REG_MOVE. */ ovs_be16 n_bits; /* Number of bits. */ @@ -579,7 +535,7 @@ OFP_ASSERT(sizeof(struct nx_action_reg_move) == 24); */ struct nx_action_reg_load { ovs_be16 type; /* OFPAT_VENDOR. */ - ovs_be16 len; /* Length is 16. */ + ovs_be16 len; /* Length is 24. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_REG_LOAD. */ ovs_be16 ofs_nbits; /* (ofs << 6) | (n_bits - 1). */ @@ -1003,7 +959,7 @@ OFP_ASSERT(sizeof(struct nx_action_fin_timeout) == 16); */ struct nx_action_autopath { ovs_be16 type; /* OFPAT_VENDOR. */ - ovs_be16 len; /* Length is 20. */ + ovs_be16 len; /* Length is 24. */ ovs_be32 vendor; /* NX_VENDOR_ID. */ ovs_be16 subtype; /* NXAST_AUTOPATH. */ @@ -1768,15 +1724,15 @@ OFP_ASSERT(sizeof(struct nx_action_output_reg) == 24); enum nx_flow_format { NXFF_OPENFLOW10 = 0, /* Standard OpenFlow 1.0 compatible. */ - NXFF_NXM = 2 /* Nicira extended match. */ + NXFF_NXM = 2, /* Nicira extended match. */ + NXFF_OPENFLOW12 = 3 /* OpenFlow 1.2 format. */ }; /* NXT_SET_FLOW_FORMAT request. */ struct nx_set_flow_format { - struct nicira_header nxh; ovs_be32 format; /* One of NXFF_*. */ }; -OFP_ASSERT(sizeof(struct nx_set_flow_format) == 20); +OFP_ASSERT(sizeof(struct nx_set_flow_format) == 4); /* NXT_FLOW_MOD (analogous to OFPT_FLOW_MOD). * @@ -1785,7 +1741,6 @@ OFP_ASSERT(sizeof(struct nx_set_flow_format) == 20); * is used only to add or modify flow cookies. */ struct nx_flow_mod { - struct nicira_header nxh; ovs_be64 cookie; /* Opaque controller-issued identifier. */ ovs_be16 command; /* One of OFPFC_*. */ ovs_be16 idle_timeout; /* Idle time before discarding (seconds). */ @@ -1808,11 +1763,10 @@ struct nx_flow_mod { * multiple of 8). */ }; -OFP_ASSERT(sizeof(struct nx_flow_mod) == 48); +OFP_ASSERT(sizeof(struct nx_flow_mod) == 32); /* NXT_FLOW_REMOVED (analogous to OFPT_FLOW_REMOVED). */ struct nx_flow_removed { - struct nicira_header nxh; ovs_be64 cookie; /* Opaque controller-issued identifier. */ ovs_be16 priority; /* Priority level of flow entry. */ uint8_t reason; /* One of OFPRR_*. */ @@ -1829,7 +1783,7 @@ struct nx_flow_removed { * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of * all-zero bytes. */ }; -OFP_ASSERT(sizeof(struct nx_flow_removed) == 56); +OFP_ASSERT(sizeof(struct nx_flow_removed) == 40); /* Nicira vendor stats request of type NXST_FLOW (analogous to OFPST_FLOW * request). @@ -1838,7 +1792,6 @@ OFP_ASSERT(sizeof(struct nx_flow_removed) == 56); * NXM_NX_COOKIE and NXM_NX_COOKIE_W matches. */ struct nx_flow_stats_request { - struct nicira_stats_msg nsm; ovs_be16 out_port; /* Require matching entries to include this as an output port. A value of OFPP_NONE indicates no restriction. */ @@ -1853,7 +1806,7 @@ struct nx_flow_stats_request { * message. */ }; -OFP_ASSERT(sizeof(struct nx_flow_stats_request) == 32); +OFP_ASSERT(sizeof(struct nx_flow_stats_request) == 8); /* Body for Nicira vendor stats reply of type NXST_FLOW (analogous to * OFPST_FLOW reply). @@ -1884,8 +1837,7 @@ struct nx_flow_stats { ovs_be32 duration_sec; /* Time flow has been alive in seconds. */ ovs_be32 duration_nsec; /* Time flow has been alive in nanoseconds beyond duration_sec. */ - ovs_be16 priority; /* Priority of the entry. Only meaningful - when this is not an exact-match entry. */ + ovs_be16 priority; /* Priority of the entry. */ ovs_be16 idle_timeout; /* Number of seconds idle before expiration. */ ovs_be16 hard_timeout; /* Number of seconds before expiration. */ ovs_be16 match_len; /* Length of nx_match. */ @@ -1905,9 +1857,11 @@ struct nx_flow_stats { OFP_ASSERT(sizeof(struct nx_flow_stats) == 48); /* Nicira vendor stats request of type NXST_AGGREGATE (analogous to - * OFPST_AGGREGATE request). */ + * OFPST_AGGREGATE request). + * + * The reply format is identical to the reply format for OFPST_AGGREGATE, + * except for the header. */ struct nx_aggregate_stats_request { - struct nicira_stats_msg nsm; ovs_be16 out_port; /* Require matching entries to include this as an output port. A value of OFPP_NONE indicates no restriction. */ @@ -1922,18 +1876,7 @@ struct nx_aggregate_stats_request { * message. */ }; -OFP_ASSERT(sizeof(struct nx_aggregate_stats_request) == 32); - -/* Body for nicira_stats_msg reply of type NXST_AGGREGATE (analogous to - * OFPST_AGGREGATE reply). */ -struct nx_aggregate_stats_reply { - struct nicira_stats_msg nsm; - ovs_be64 packet_count; /* Number of packets, UINT64_MAX if unknown. */ - ovs_be64 byte_count; /* Number of bytes, UINT64_MAX if unknown. */ - ovs_be32 flow_count; /* Number of flows. */ - uint8_t pad[4]; /* Align to 64 bits. */ -}; -OFP_ASSERT(sizeof(struct nx_aggregate_stats_reply) == 48); +OFP_ASSERT(sizeof(struct nx_aggregate_stats_request) == 8); /* NXT_SET_CONTROLLER_ID. * @@ -1945,11 +1888,10 @@ OFP_ASSERT(sizeof(struct nx_aggregate_stats_reply) == 48); * The NXAST_CONTROLLER action is the only current user of controller * connection IDs. */ struct nx_controller_id { - struct nicira_header nxh; uint8_t zero[6]; /* Must be zero. */ ovs_be16 controller_id; /* New controller connection ID. */ }; -OFP_ASSERT(sizeof(struct nx_controller_id) == 24); +OFP_ASSERT(sizeof(struct nx_controller_id) == 8); /* Action structure for NXAST_CONTROLLER. * @@ -1974,5 +1916,241 @@ struct nx_action_controller { uint8_t zero; /* Must be zero. */ }; OFP_ASSERT(sizeof(struct nx_action_controller) == 16); + +/* Flow Table Monitoring + * ===================== + * + * NXST_FLOW_MONITOR allows a controller to keep track of changes to OpenFlow + * flow table(s) or subsets of them, with the following workflow: + * + * 1. The controller sends an NXST_FLOW_MONITOR request to begin monitoring + * flows. The 'id' in the request must be unique among all monitors that + * the controller has started and not yet canceled on this OpenFlow + * connection. + * + * 2. The switch responds with an NXST_FLOW_MONITOR reply. If the request's + * 'flags' included NXFMF_INITIAL, the reply includes all the flows that + * matched the request at the time of the request (with event NXFME_ADDED). + * If 'flags' did not include NXFMF_INITIAL, the reply is empty. + * + * The reply uses the xid of the request (as do all replies to OpenFlow + * requests). + * + * 3. Whenever a change to a flow table entry matches some outstanding monitor + * request's criteria and flags, the switch sends a notification to the + * controller as an additional NXST_FLOW_MONITOR reply with xid 0. + * + * When multiple outstanding monitors match a single change, only a single + * notification is sent. This merged notification includes the information + * requested in any of the individual monitors. That is, if any of the + * matching monitors requests actions (NXFMF_ACTIONS), the notification + * includes actions, and if any of the monitors request full changes for the + * controller's own changes (NXFMF_OWN), the controller's own changes will + * be included in full. + * + * 4. The controller may cancel a monitor with NXT_FLOW_MONITOR_CANCEL. No + * further notifications will be sent on the basis of the canceled monitor + * afterward. + * + * + * Buffer Management + * ================= + * + * OpenFlow messages for flow monitor notifications can overflow the buffer + * space available to the switch, either temporarily (e.g. due to network + * conditions slowing OpenFlow traffic) or more permanently (e.g. the sustained + * rate of flow table change exceeds the network bandwidth between switch and + * controller). + * + * When Open vSwitch's notification buffer space reaches a limiting threshold, + * OVS reacts as follows: + * + * 1. OVS sends an NXT_FLOW_MONITOR_PAUSED message to the controller, following + * all the already queued notifications. After it receives this message, + * the controller knows that its view of the flow table, as represented by + * flow monitor notifications, is incomplete. + * + * 2. As long as the notification buffer is not empty: + * + * - NXMFE_ADD and NXFME_MODIFIED notifications will not be sent. + * + * - NXFME_DELETED notifications will still be sent, but only for flows + * that existed before OVS sent NXT_FLOW_MONITOR_PAUSED. + * + * - NXFME_ABBREV notifications will not be sent. They are treated as + * the expanded version (and therefore only the NXFME_DELETED + * components, if any, are sent). + * + * 3. When the notification buffer empties, OVS sends NXFME_ADD notifications + * for flows added since the buffer reached its limit and NXFME_MODIFIED + * notifications for flows that existed before the limit was reached and + * changed after the limit was reached. + * + * 4. OVS sends an NXT_FLOW_MONITOR_RESUMED message to the controller. After + * it receives this message, the controller knows that its view of the flow + * table, as represented by flow monitor notifications, is again complete. + * + * This allows the maximum buffer space requirement for notifications to be + * bounded by the limit plus the maximum number of supported flows. + * + * + * "Flow Removed" messages + * ======================= + * + * The flow monitor mechanism is independent of OFPT_FLOW_REMOVED and + * NXT_FLOW_REMOVED. Flow monitor updates for deletion are sent if + * NXFMF_DELETE is set on a monitor, regardless of whether the + * OFPFF_SEND_FLOW_REM flag was set when the flow was added. */ + +/* NXST_FLOW_MONITOR request. + * + * The NXST_FLOW_MONITOR request's body consists of an array of zero or more + * instances of this structure. The request arranges to monitor the flows + * that match the specified criteria, which are interpreted in the same way as + * for NXST_FLOW. + * + * 'id' identifies a particular monitor for the purpose of allowing it to be + * canceled later with NXT_FLOW_MONITOR_CANCEL. 'id' must be unique among + * existing monitors that have not already been canceled. + * + * The reply includes the initial flow matches for monitors that have the + * NXFMF_INITIAL flag set. No single flow will be included in the reply more + * than once, even if more than one requested monitor matches that flow. The + * reply will be empty if none of the monitors has NXFMF_INITIAL set or if none + * of the monitors initially matches any flows. + * + * For NXFMF_ADD, an event will be reported if 'out_port' matches against the + * actions of the flow being added or, for a flow that is replacing an existing + * flow, if 'out_port' matches against the actions of the flow being replaced. + * For NXFMF_DELETE, 'out_port' matches against the actions of a flow being + * deleted. For NXFMF_MODIFY, an event will be reported if 'out_port' matches + * either the old or the new actions. */ +struct nx_flow_monitor_request { + ovs_be32 id; /* Controller-assigned ID for this monitor. */ + ovs_be16 flags; /* NXFMF_*. */ + ovs_be16 out_port; /* Required output port, if not OFPP_NONE. */ + ovs_be16 match_len; /* Length of nx_match. */ + uint8_t table_id; /* One table's ID or 0xff for all tables. */ + uint8_t zeros[5]; /* Align to 64 bits (must be zero). */ + /* Followed by: + * - Exactly match_len (possibly 0) bytes containing the nx_match, then + * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of + * all-zero bytes. */ +}; +OFP_ASSERT(sizeof(struct nx_flow_monitor_request) == 16); + +/* 'flags' bits in struct nx_flow_monitor_request. */ +enum nx_flow_monitor_flags { + /* When to send updates. */ + NXFMF_INITIAL = 1 << 0, /* Initially matching flows. */ + NXFMF_ADD = 1 << 1, /* New matching flows as they are added. */ + NXFMF_DELETE = 1 << 2, /* Old matching flows as they are removed. */ + NXFMF_MODIFY = 1 << 3, /* Matching flows as they are changed. */ + + /* What to include in updates. */ + NXFMF_ACTIONS = 1 << 4, /* If set, actions are included. */ + NXFMF_OWN = 1 << 5, /* If set, include own changes in full. */ +}; + +/* NXST_FLOW_MONITOR reply header. + * + * The body of an NXST_FLOW_MONITOR reply is an array of variable-length + * structures, each of which begins with this header. The 'length' member may + * be used to traverse the array, and the 'event' member may be used to + * determine the particular structure. + * + * Every instance is a multiple of 8 bytes long. */ +struct nx_flow_update_header { + ovs_be16 length; /* Length of this entry. */ + ovs_be16 event; /* One of NXFME_*. */ + /* ...other data depending on 'event'... */ +}; +OFP_ASSERT(sizeof(struct nx_flow_update_header) == 4); + +/* 'event' values in struct nx_flow_update_header. */ +enum nx_flow_update_event { + /* struct nx_flow_update_full. */ + NXFME_ADDED = 0, /* Flow was added. */ + NXFME_DELETED = 1, /* Flow was deleted. */ + NXFME_MODIFIED = 2, /* Flow (generally its actions) was changed. */ + + /* struct nx_flow_update_abbrev. */ + NXFME_ABBREV = 3, /* Abbreviated reply. */ +}; + +/* NXST_FLOW_MONITOR reply for NXFME_ADDED, NXFME_DELETED, and + * NXFME_MODIFIED. */ +struct nx_flow_update_full { + ovs_be16 length; /* Length is 24. */ + ovs_be16 event; /* One of NXFME_*. */ + ovs_be16 reason; /* OFPRR_* for NXFME_DELETED, else zero. */ + ovs_be16 priority; /* Priority of the entry. */ + ovs_be16 idle_timeout; /* Number of seconds idle before expiration. */ + ovs_be16 hard_timeout; /* Number of seconds before expiration. */ + ovs_be16 match_len; /* Length of nx_match. */ + uint8_t table_id; /* ID of flow's table. */ + uint8_t pad; /* Reserved, currently zeroed. */ + ovs_be64 cookie; /* Opaque controller-issued identifier. */ + /* Followed by: + * - Exactly match_len (possibly 0) bytes containing the nx_match, then + * - Exactly (match_len + 7)/8*8 - match_len (between 0 and 7) bytes of + * all-zero bytes, then + * - Actions to fill out the remainder 'length' bytes (always a multiple + * of 8). If NXFMF_ACTIONS was not specified, or 'event' is + * NXFME_DELETED, no actions are included. + */ +}; +OFP_ASSERT(sizeof(struct nx_flow_update_full) == 24); + +/* NXST_FLOW_MONITOR reply for NXFME_ABBREV. + * + * When the controller does not specify NXFMF_OWN in a monitor request, any + * flow tables changes due to the controller's own requests (on the same + * OpenFlow channel) will be abbreviated, when possible, to this form, which + * simply specifies the 'xid' of the OpenFlow request (e.g. an OFPT_FLOW_MOD or + * NXT_FLOW_MOD) that caused the change. + * + * Some changes cannot be abbreviated and will be sent in full: + * + * - Changes that only partially succeed. This can happen if, for example, + * a flow_mod with type OFPFC_MODIFY affects multiple flows, but only some + * of those modifications succeed (e.g. due to hardware limitations). + * + * This cannot occur with the current implementation of the Open vSwitch + * software datapath. It could happen with other datapath implementations. + * + * - Changes that race with conflicting changes made by other controllers or + * other flow_mods (not separated by barriers) by the same controller. + * + * This cannot occur with the current Open vSwitch implementation + * (regardless of datapath) because Open vSwitch internally serializes + * potentially conflicting changes. + * + * A flow_mod that does not change the flow table will not trigger any + * notification, even an abbreviated one. For example, a "modify" or "delete" + * flow_mod that does not match any flows will not trigger a notification. + * Whether an "add" or "modify" that specifies all the same parameters that a + * flow already has triggers a notification is unspecified and subject to + * change in future versions of Open vSwitch. + * + * OVS will always send the notifications for a given flow table change before + * the reply to a OFPT_BARRIER_REQUEST request that precedes the flow table + * change. Thus, if the controller does not receive an abbreviated + * notification for a flow_mod before the next OFPT_BARRIER_REPLY, it will + * never receive one. */ +struct nx_flow_update_abbrev { + ovs_be16 length; /* Length is 8. */ + ovs_be16 event; /* NXFME_ABBREV. */ + ovs_be32 xid; /* Controller-specified xid from flow_mod. */ +}; +OFP_ASSERT(sizeof(struct nx_flow_update_abbrev) == 8); + +/* NXT_FLOW_MONITOR_CANCEL. + * + * Used by a controller to cancel an outstanding monitor. */ +struct nx_flow_monitor_cancel { + ovs_be32 id; /* 'id' from nx_flow_monitor_request. */ +}; +OFP_ASSERT(sizeof(struct nx_flow_monitor_cancel) == 4); #endif /* openflow/nicira-ext.h */