ibv_attach_counters_poinLibibverbs ProgrammeribvMattach_counters_point_flow(3)
NAME
ibv_attach_counters_point_flow - attach individual counter definition
to a flow object
SYNOPSIS
#include <infiniband/verbs.h>
int ibv_attach_counters_point_flow(struct ibv_counters *counters,
struct ibv_counter_attach_attr *counter_attach_attr,
struct ibv_flow *flow);
DESCRIPTION
Attach counters point are a family of APIs to attach individual counter
description definition to a verb object at a specific index location.
Counters object will start collecting values after it is bound to the
verb object resource.
A static attach can be created when NULL is provided instead of the
reference to the verbs object (e.g.: in case of flow providing NULL in-
stead of flow). In this case, this counters object will only start
collecting values after it is bound to the verbs resource, for flow
this is when referencing the counters handle when creating a flow with
ibv_create_flow().
Once an ibv_counters is bound statically to a verbs resource, no addi-
tional attach is allowed till the counter object is not bound to any
verb object.
The argument counter_desc specifies which counter value should be col-
lected. It is defined in verbs.h as one of the enum ibv_counter_de-
scription options.
Supported capabilities of specific counter_desc values per verbs object
can be tested by checking the return value for success or ENOTSUP er-
rno.
Attaching a counters handle to multiple objects of the same type will
accumulate the values into a single index. e.g.: creating several
ibv_flow(s) with the same ibv_counters handle will collect the values
from all relevant flows into the relevant index location when reading
the values from ibv_read_counters(), setting the index more than once
with different or same counter_desc will aggregate the values from all
relevant counters into the relevant index location.
The runtime values of counters can be read from the hardware by calling
ibv_read_counters().
ARGUMENTS
counters
Existing counters to attach new counter point on.
counter_attach_attr
An ibv_counter_attach_attr struct, as defined in verbs.h.
flow Existing flow to attach a new counters point on (in static mode
it must be NULL).
counter_attach_attr Argument
struct ibv_counter_attach_attr {
enum ibv_counter_description counter_desc;
uint32_t index;
uint32_t comp_mask;
};
counter_desc Argument
enum ibv_counter_description {
IBV_COUNTER_PACKETS,
IBV_COUNTER_BYTES,
};
index Desired location of the specific counter at the counters object.
comp_mask
Bitmask specifying what fields in the structure are valid.
RETURN VALUE
ibv_attach_counters_point_flow() returns 0 on success, or the value of
errno on failure (which indicates the failure reason)
ERRORS
EINVAL invalid argument(s) passed
ENOTSUP
counter_desc is not supported on the requested object
EBUSY the counter object is already bound to a flow, additional attach
calls is not allowed (valid for static attach only)
ENOMEM not enough memory
NOTES
Counter values in each index location are cleared upon creation when
calling ibv_create_counters(). Attaching counters points will only in-
crease these values accordingly.
EXAMPLE
An example of use of ibv_attach_counters_point_flow() is shown in
ibv_read_counters
SEE ALSO
ibv_create_counters, ibv_destroy_counters, ibv_read_counters, ibv_cre-
ate_flow
AUTHORS
Raed Salem <raeds@mellanox.com>
Alex Rosenbaum <alexr@mellanox.com>
libibverbs 2018-04-02 ibv_attach_counters_point_flow(3)
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