# mlx5dv_dr_action_create_modify_header

## NAME



           mlx5dv_dr_domain_create, mlx5dv_dr_domain_sync,
           mlx5dv_dr_domain_destroy,
           mlx5dv_dr_domain_set_reclaim_device_memory,
           mlx5dv_dr_domain_allow_duplicate_rules - Manage flow domains
    
           mlx5dv_dr_table_create, mlx5dv_dr_table_destroy - Manage flow
           tables
    
           mlx5dv_dr_matcher_create, mlx5dv_dr_matcher_destroy,
           mlx5dv_dr_matcher_set_layout - Manage flow matchers
    
           mlx5dv_dr_rule_create, mlx5dv_dr_rule_destroy - Manage flow rules
    
           mlx5dv_dr_action_create_drop - Create drop action
    
           mlx5dv_dr_action_create_default_miss - Create default miss action
    
           mlx5dv_dr_action_create_tag - Create tag actions
    
           mlx5dv_dr_action_create_dest_ibv_qp - Create packet destination QP
           action
    
           mlx5dv_dr_action_create_dest_table - Create packet destination dr
           table action
    
           mlx5dv_dr_action_create_dest_root_table - Create packet
           destination root table action
    
           mlx5dv_dr_action_create_dest_vport - Create packet destination
           vport action
    
           mlx5dv_dr_action_create_dest_ib_port - Create packet destination
           IB port action
    
           mlx5dv_dr_action_create_dest_devx_tir - Create packet destination
           TIR action
    
           mlx5dv_dr_action_create_dest_array - Create destination array
           action
    
           mlx5dv_dr_action_create_packet_reformat - Create packet reformat
           actions
    
           mlx5dv_dr_action_create_modify_header - Create modify header
           actions
    
           mlx5dv_dr_action_create_flow_counter - Create devx flow counter
           actions
    
           mlx5dv_dr_action_create_aso, mlx5dv_dr_action_modify_aso - Create
           and modify ASO actions
    
           mlx5dv_dr_action_create_flow_meter,
           mlx5dv_dr_action_modify_flow_meter - Create and modify meter
           action
    
           mlx5dv_dr_action_create_flow_sampler - Create flow sampler action
    
           mlx5dv_dr_action_create_pop_vlan - Create pop vlan action
    
           mlx5dv_dr_action_create_push_vlan- Create push vlan action
    
           mlx5dv_dr_action_destroy - Destroy actions
    
           mlx5dv_dr_aso_other_domain_link, mlx5dv_dr_aso_other_domain_unlink
           - link/unlink ASO devx object to work with different domains
    


## SYNOPSIS



                  #include <infiniband/mlx5dv.h>
    
                  struct mlx5dv_dr_domain *mlx5dv_dr_domain_create(
                          struct ibv_context *ctx,
                          enum mlx5dv_dr_domain_type type);
    
                  int mlx5dv_dr_domain_sync(
                          struct mlx5dv_dr_domain *domain,
                          uint32_t flags);
    
                  int mlx5dv_dr_domain_destroy(struct mlx5dv_dr_domain *domain);
    
                  void mlx5dv_dr_domain_set_reclaim_device_memory(
                          struct mlx5dv_dr_domain *dmn,
                          bool enable);
    
                  void mlx5dv_dr_domain_allow_duplicate_rules(struct mlx5dv_dr_domain *dmn, bool allow);
    
                  struct mlx5dv_dr_table *mlx5dv_dr_table_create(
                          struct mlx5dv_dr_domain *domain,
                          uint32_t level);
    
                  int mlx5dv_dr_table_destroy(struct mlx5dv_dr_table *table);
    
                  struct mlx5dv_dr_matcher *mlx5dv_dr_matcher_create(
                          struct mlx5dv_dr_table *table,
                          uint16_t priority,
                          uint8_t match_criteria_enable,
                          struct mlx5dv_flow_match_parameters *mask);
    
                  int mlx5dv_dr_matcher_destroy(struct mlx5dv_dr_matcher *matcher);
    
                  int mlx5dv_dr_matcher_set_layout(struct mlx5dv_dr_matcher *matcher, struct mlx5dv_dr_matcher_layout *matcher_layout);
    
                  struct mlx5dv_dr_rule *mlx5dv_dr_rule_create(
                          struct mlx5dv_dr_matcher *matcher,
                          struct mlx5dv_flow_match_parameters *value,
                          size_t num_actions,
                          struct mlx5dv_dr_action *actions[]);
    
                  void mlx5dv_dr_rule_destroy(struct mlx5dv_dr_rule *rule);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_drop(void);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_default_miss(void);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_tag(
                          uint32_t tag_value);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_dest_ibv_qp(
                          struct ibv_qp *ibqp);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_dest_table(
                          struct mlx5dv_dr_table *table);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_dest_root_table(
                          struct mlx5dv_dr_table *table, uint16_t priority);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_dest_vport(
                          struct mlx5dv_dr_domain *domain,
                          uint32_t vport);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_dest_ib_port(
                          struct mlx5dv_dr_domain *domain,
                          uint32_t ib_port);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_dest_devx_tir(
                          struct mlx5dv_devx_obj *devx_obj);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_packet_reformat(
                          struct mlx5dv_dr_domain *domain,
                          uint32_t flags,
                          enum mlx5dv_flow_action_packet_reformat_type reformat_type,
                          size_t data_sz, void *data);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_modify_header(
                          struct mlx5dv_dr_domain *domain,
                          uint32_t flags,
                          size_t actions_sz,
                          __be64 actions[]);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_flow_counter(
                          struct mlx5dv_devx_obj *devx_obj,
                          uint32_t offset);
    
                  struct mlx5dv_dr_action *
                  mlx5dv_dr_action_create_aso(struct mlx5dv_dr_domain *domain,
                                  struct mlx5dv_devx_obj *devx_obj,
                                  uint32_t offset,
                                  uint32_t flags,
                                  uint8_t return_reg_c);
    
                  int mlx5dv_dr_action_modify_aso(struct mlx5dv_dr_action *action,
                                  uint32_t offset,
                                  uint32_t flags,
                                  uint8_t return_reg_c);
    
                  struct mlx5dv_dr_action *
                  mlx5dv_dr_action_create_flow_meter(struct mlx5dv_dr_flow_meter_attr *attr);
    
                  int mlx5dv_dr_action_modify_flow_meter(struct mlx5dv_dr_action *action,
                                         struct mlx5dv_dr_flow_meter_attr *attr,
                                         __be64 modify_field_select);
    
                  struct mlx5dv_dr_action *
                  mlx5dv_dr_action_create_flow_sampler(struct mlx5dv_dr_flow_sampler_attr *attr);
    
                  struct mlx5dv_dr_action *
                  mlx5dv_dr_action_create_dest_array(struct mlx5dv_dr_domain *domain,
                                     size_t num_dest,
                                     struct mlx5dv_dr_action_dest_attr *dests[]);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_pop_vlan(void);
    
                  struct mlx5dv_dr_action *mlx5dv_dr_action_create_push_vlan(
                          struct mlx5dv_dr_domain *dmn,
                          __be32 vlan_hdr)
    
                  int mlx5dv_dr_action_destroy(struct mlx5dv_dr_action *action);
    
                  int mlx5dv_dr_aso_other_domain_link(struct mlx5dv_devx_obj *devx_obj,
                                      struct mlx5dv_dr_domain *peer_dmn,
                                      struct mlx5dv_dr_domain *dmn,
                                      uint32_t flags,
                                      uint8_t return_reg_c);
    
                  int mlx5dv_dr_aso_other_domain_unlink(struct mlx5dv_devx_obj *devx_obj,
                                        struct mlx5dv_dr_domain *dmn);
    


## DESCRIPTION



           The Direct Rule API (mlx5dv_dr_*) allows complete access by verbs
           application to the device`s packet steering functionality.
    
           Steering flow rules are the combination of attributes with a match
           pattern and a list of actions.  Rules can have several distinct
           actions (such as counting, encapsulating, decapsulating before
           redirecting packets to a particular queue or port, etc.).  In
           order to manage the rule execution order for the packet processing
           matching by HW, multiple flow tables in an ordered chain and
           multiple flow matchers sorted by priorities are defined.
    
       **Domain**
           _mlx5dv_dr_domain_create()_ creates a DR domain object to be used
           with _mlx5dv_dr_table_create()_ and _mlx5dv_dr_action_create_*()_.
    
           A domain should be destroyed by calling _mlx5dv_dr_domain_destroy()_
           once all depended resources are released.
    
           The device support the following domains types:
    
           **MLX5DV_DR_DOMAIN_TYPE_NIC_RX** Manage ethernet packets received on
           the NIC.  Packets in this domain can be dropped, dispatched to
           QP`s, modified or redirected to additional tables inside the
           domain.  Default behavior: Drop packet.
    
           **MLX5DV_DR_DOMAIN_TYPE_NIC_TX** Manage ethernet packets transmit on
           the NIC.  Packets in this domain can be dropped, modified or
           redirected to additional tables inside the domain.  Default
           behavior: Forward packet to NIC vport (to eSwitch or wire).
    
           **MLX5DV_DR_DOMAIN_TYPE_FDB** Manage ethernet packets in the eSwitch
           Forwarding Data Base for packets received from wire or from any
           other vport.  Packets in this domain can be dropped, dispatched to
           vport, modified or redirected to additional tables inside the
           domain.  Default behavior: Forward packet to eSwitch manager
           vport.
    
           _mlx5dv_dr_domain_sync()_ is used in order to flush the rule
           submission queue.  By default, rules in a domain are updated in HW
           asynchronously.  **flags** should be a set of type _enum_
           _mlx5dv_dr_domain_sync_flags_ :
    
           **MLX5DV_DR_DOMAIN_SYNC_FLAGS_SW** : block until completion of all
           software queued tasks.
    
           **MLX5DV_DR_DOMAIN_SYNC_FLAGS_HW** : clear the steering HW cache to
           enforce next packet hits the latest rules, in addition to the SW
           SYNC handling.
    
           **MLX5DV_DR_DOMAIN_SYNC_FLAGS_MEM** : sync device memory to free cached
           memory.
    
           _mlx5dv_dr_domain_set_reclaim_device_memory()_ is used to enable the
           reclaiming of device memory back to the system when not in use, by
           default this feature is disabled.
    
           _mlx5dv_dr_domain_allow_duplicate_rules()_ is used to allow or
           prevent insertion of rules matching on same fields(duplicates) on
           non root tables, by default this feature is allowed.
    
       **Table**
           _mlx5dv_dr_table_create()_ creates a DR table in the **domain** , at the
           appropriate **level** , and can be used with
           _mlx5dv_dr_matcher_create()_ , _mlx5dv_dr_action_create_dest_table()_
           and _mlx5dv_dr_action_create_dest_root_table_.  All packets start
           traversing the steering domain tree at table **level** zero (0).
           Using rule and action, packets can by redirected to other tables
           in the domain.
    
           A table should be destroyed by calling _mlx5dv_dr_table_destroy()_
           once all depended resources are released.
    
       **Matcher**
           _mlx5dv_dr_matcher_create()_ create a matcher object in **table** , at
           sorted **priority**(lower value is check first).  A matcher can hold
           multiple rules, all with identical **mask** of type _struct_
           _mlx5dv_flow_match_parameters_ which represents the exact attributes
           to be compared by HW steering.  The **match_criteria_enable** and **mask**
           are defined in a device spec format.  Only the fields that where
           masked in the _matcher_ should be filled by the rule in
           _mlx5dv_dr_rule_create()_.
    
           A matcher should be destroyed by calling
           _mlx5dv_dr_matcher_destroy()_ once all depended resources are
           released.
    
           _mlx5dv_dr_matcher_set_layout()_ is used to set specific layout
           parameters of a matcher, on some conditions setting some
           attributes might not be supported, in such cases ENOTSUP will be
           returned.  **flags** should be a set of type _enum_
           _mlx5dv_dr_matcher_layout_flags_ :
    
           **MLX5DV_DR_MATCHER_LAYOUT_RESIZABLE** : The matcher can resize its
           scale and resources according to the rules that are inserted or
           removed.
    
           **MLX5DV_DR_MATCHER_LAYOUT_NUM_RULE** : Indicates a hint from the
           application about the number of the rules the matcher is expected
           to handle.  This allows preallocation of matcher resources for
           faster rule updates when using with non-resizable layout mode.
    
       **Actions**
           A set of action create API are defined by
           _mlx5dv_dr_action_create_*()_.  All action are created as _struct_
           _mlx5dv_dr_action_.  An action should be destroyed by calling
           _mlx5dv_dr_action_destroy()_ once all depended rules are destroyed.
    
           When an action handle is reused for multiple rules, the same
           action will be executed.  e.g.: action `count' will count multiple
           flows rules on the same HW flow counter context.  action `drop'
           will drop packets of different rule from any matcher.
    
           Action: Drop _mlx5dv_dr_action_create_drop_ create a terminating
           action which drops packets.  Can not be mixed with Destination
           actions.
    
           Action: Default miss _mlx5dv_dr_action_create_default_miss_ create a
           terminating action which will execute the default behavior based
           on the domain type.
    
           Action: Tag _mlx5dv_dr_action_create_tag_ creates a non-terminating
           action which tags packets with **tag_value**.  The **tag_value** is
           available in the CQE of the packet received.  Valid only on domain
           type NIC_RX.
    
           Action: Destination _mlx5dv_dr_action_create_dest_ibv_qp_ creates a
           terminating action delivering the packet to a QP, defined by **ibqp**.
           Valid only on domain type NIC_RX.
           _mlx5dv_dr_action_create_dest_table_ creates a forwarding action to
           another flow table, defined by **table**.  The destination **table** must
           be from the same domain with a level higher than zero.
           _mlx5dv_dr_action_create_dest_root_table_ creates a forwarding
           action to another priority inside a root flow table, defined by
           **table** and **priority**.  _mlx5dv_dr_action_create_dest_vport_ creates a
           forwarding action to a **vport** on the same **domain**.  Valid only on
           domain type FDB.  _mlx5dv_dr_action_create_dest_ib_port_ creates a
           forwarding action to a **ib_port** on the same **domain**.  The valid
           range of ports is a based on the capability phys_port_cnt_ex
           provided by ibq_query_device_ex and it is possible to query the
           ports details using mlx5dv_query_port.  Action is supported only
           on domain type FDB.  _mlx5dv_dr_action_create_dest_devx_tir_ creates
           a terminating action delivering the packet to a TIR, defined by
           **devx_obj**.  Valid only on domain type NIC_RX.
    
           Action: Array _mlx5dv_dr_action_create_dest_array_ creates an action
           which replicates a packet to multiple destinations.  **num_dest**
           defines the number of replication destinations.  Each **dests**
           destination array entry can be of different **type**.  Use type
           MLX5DV_DR_ACTION_DEST for direct forwarding to an action
           destination.  Use type MLX5DV_DR_ACTION_DEST_REFORMAT when
           reformat action should be performed on the packet before it is
           forwarding to the destination action.
    
           Action: Packet Reformat _mlx5dv_dr_action_create_packet_reformat_
           create a packet reformat context and action in the **domain**.  The
           **reformat_type** , **data_sz** and **data** are defined in _man_
           _mlx5dv_create_flow_action_packet_reformat_.
    
           Action: Modify Header _mlx5dv_dr_action_create_modify_header_ create
           a modify header context and action in the **domain**.  The **actions_sz**
           and **actions** are defined in _man_
           _mlx5dv_create_flow_action_modify_header_.
    
           Action: Flow Count _mlx5dv_dr_action_create_flow_counter_ creates a
           flow counter action from a DEVX flow counter object, based on
           **devx_obj** and specific counter index from **offset** in the counter
           bulk.
    
           Action: ASO _mlx5dv_dr_action_create_aso_ receives a **domain** pointer
           and creates an ASO action from the DEVX ASO object, based on
           **devx_obj**.  Use **offset** to select the specific ASO object in the
           **devx_obj** bulk.  DR rules using this action can optionally update
           the ASO object value according to **flags** to choose the specific
           wanted behavior of this object.  After a packet hits the rule with
           the ASO object the value of the ASO object will be copied into the
           chosen **return_reg_c** which can be used for match in following DR
           rules.
    
           _mlx5dv_dr_action_modify_aso_ modifies ASO action **action** with new
           values for **offset** , **return_reg_c** and **flags**.  Only new DR rules
           using this **action** will use the modified values.  Existing DR rules
           do not change the HW action values stored.
    
           **flags** can be set to one of the types of
           _mlx5dv_dr_action_aso_first_hit_flags_ or
           _mlx5dv_dr_action_aso_flow_meter_flags_ or
           _mlx5dv_dr_action_aso_ct_flags_ :
           **MLX5DV_DR_ACTION_ASO_FIRST_HIT_FLAGS_SET** : is used to set the ASO
           first hit object context, else the context is only copied to the
           return_reg_c.  **MLX5DV_DR_ACTION_FLAGS_ASO_FLOW_METER_RED** : is used
           to indicate to update the initial color in ASO flow meter object
           value to red.  **MLX5DV_DR_ACTION_FLAGS_ASO_FLOW_METER_YELLOW** : is
           used to indicate to update the initial color in ASO flow meter
           object value to yellow.
           **MLX5DV_DR_ACTION_FLAGS_ASO_FLOW_METER_GREEN** : is used to indicate
           to update the initial color in ASO flow meter object value to
           green.  **MLX5DV_DR_ACTION_FLAGS_ASO_FLOW_METER_UNDEFINED** : is used
           to indicate to update the initial color in ASO flow meter object
           value to undefined.
           **MLX5DV_DR_ACTION_FLAGS_ASO_CT_DIRECTION_INITIATOR** : is used to
           indicate the TCP connection direction the SYN packet was sent on.
           **MLX5DV_DR_ACTION_FLAGS_ASO_CT_DIRECTION_RESPONDER** : is used to
           indicate the TCP connection direction the SYN-ACK packet was sent
           on.
    
           Action: Meter _mlx5dv_dr_action_create_flow_meter_ creates a meter
           action based on the flow meter parameters.  The paramertes are
           according to the device specification.
           _mlx5dv_dr_action_modify_flow_meter_ modifies existing flow meter
           **action** based on **modify_field_select**.  **modify_field_select** is
           according to the device specification.
    
           Action: Sampler _mlx5dv_dr_action_create_flow_sampler_ creates a
           sampler action, allowing us to duplicate and sample a portion of
           traffic.  Packets steered to the sampler action will be sampled
           with an approximate probability of 1/sample_ratio provided in
           **attr** , and sample_actions provided in **attr** will be executed over
           them.  All original packets will be steered to default_next_table
           in **attr**.  A modify header format SET_ACTION data can be provided
           in action of **attr** , which can be executed on packets before going
           to default flow table.  On some devices, this is required to set
           register value.
    
           Action Flags: action **flags** can be set to one of the types of _enum_
           _mlx5dv_dr_action_flags_ :
    
           Action: Pop Vlan _mlx5dv_dr_action_create_pop_vlan_ creates a pop
           vlan action which removes VLAN tags from packets layer 2.
    
           Action: Push Vlan _mlx5dv_dr_action_create_push_vlan_ creates a push
           vlan action which adds VLAN tags to packets layer 2.
    
           **MLX5DV_DR_ACTION_FLAGS_ROOT_LEVEL** : is used to indicate the action
           is targeted for flow table in level=0 (ROOT) of the specific
           domain.
    
       **Rule**
           _mlx5dv_dr_rule_create()_ creates a HW steering rule entry in
           **matcher**.  The **value** of type _struct mlx5dv_flow_match_parameters_
           holds the exact attribute values of the steering rule to be
           matched, in a device spec format.  Only the fields that where
           masked in the _matcher_ should be filled.  HW will perform the set
           of **num_actions** from the **action** array of type _struct_
           _mlx5dv_dr_action_ , once a packet matches the exact **value** of the
           rule (referred to as a `hit').
    
           _mlx5dv_dr_rule_destroy()_ destroys the rule.
    
       **Other**
           _mlx5dv_dr_aso_other_domain_link()_ links the ASO devx object,
           **devx_obj** to a domain **dmn** , this will allow creating a rule with ASO
           action using the given object on the linked domain **dmn**.  **peer_dmn**
           is the domain that the ASO devx object was created on.  **dmn** is the
           domain that ASO devx object will be linked to.  **flags** choose the
           specific wanted behavior of this object according to the flags,
           same as for ASO action creation flags.  **regc_index** After a packet
           hits the rule with the ASO object the value of the ASO object will
           be copied into the regc register indicated by this param, and then
           we can use the value for matching in the following DR rules.
    
           _mlx5dv_dr_aso_other_domain_unlink()_ will unlink the **devx_obj** from
           the linked **dmn**.  **dmn** is the domain that ASO devx object is linked
           to.
    


## RETURN VALUE



           The create API calls will return a pointer to the relevant object:
           table, matcher, action, rule.  on failure, NULL will be returned
           and errno will be set.
    
           The destroy API calls will returns 0 on success, or the value of
           errno on failure (which indicates the failure reason).
    


## LIMITATIONS



           Application can verify is a feature is supported by _trail and_
           _error_.  No capabilities are exposed, as the combination of all the
           options exposed are way to large to define.
    
           Tables are size less by definition.  They are expected to grow and
           shrink to accommodate for all rules, according to driver
           capabilities.  Once reaching a limit, an error is returned.
    
           Matchers in same priority, in the same table, will have undefined
           ordered.
    
           A rule with identical value pattern to another rule on a given
           matcher are rejected.
    
           IP version in matcher mask and rule should be equal and set to 4,
           6 or 0.  # SEE ALSO
    
           **mlx5dv_open_device(3)** ,
           **mlx5dv_create_flow_action_packet_reformat(3)** ,
           **mlx5dv_create_flow_action_modify_header(3)**.
    


* * *