Provided by: libibverbs-dev_50.0-2ubuntu0.2_amd64 
NAME
mlx5dv_dr_domain_create, mlx5dv_dr_domain_sync, mlx5dv_dr_domain_destroy, mlx5dv_dr_domain_set_re‐
claim_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 re‐
leased.
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 be‐
havior: 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 re‐
ceived 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 do‐
main 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_cre‐
ate_dest_root_table. All packets start traversing the steering domain tree at table level zero (0). Us‐
ing 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 re‐
leased.
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_pa‐
rameters 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 re‐
leased.
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 up‐
dates 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_val‐
ue. 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 pack‐
et to a QP, defined by ibqp. Valid only on domain type NIC_RX. mlx5dv_dr_action_create_dest_table cre‐
ates 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_ac‐
tion_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 do‐
main. The valid range of ports is a based on the capability phys_port_cnt_ex provided by ibq_query_de‐
vice_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 en‐
try can be of different type. Use type MLX5DV_DR_ACTION_DEST for direct forwarding to an action destina‐
tion. Use type MLX5DV_DR_ACTION_DEST_REFORMAT when reformat action should be performed on the packet be‐
fore it is forwarding to the destination action.
Action: Packet Reformat mlx5dv_dr_action_create_packet_reformat create a packet reformat context and ac‐
tion in the domain. The reformat_type, data_sz and data are defined in man mlx5dv_create_flow_ac‐
tion_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 spe‐
cific 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_ac‐
tion_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_AC‐
TION_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 parame‐
ters. The paramertes are according to the device specification. mlx5dv_dr_action_modify_flow_meter mod‐
ifies 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 approxi‐
mate 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 de‐
fault 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_modi‐
fy_header(3).
AUTHOR
Alex Rosenbaum <alexr@mellanox.com> Alex Vesker <valex@mellanox.com>
mlx5 2019-03-28 MLX5DV_DR API(3)