# man > tc-actions(8) _actions_ _in_ [_tc_(8)](https://www.chedong.com/phpMan.php/man/tc/8/markdown) Linux _actions_ _in_ [_tc_(8)](https://www.chedong.com/phpMan.php/man/tc/8/markdown) ## NAME actions - independently defined actions in tc ## SYNOPSIS **tc **[ _TC_OPTIONS_ ] **actions add **| **change **| **replace _**ACTSPEC_ **tc **[ _TC_OPTIONS_ ] **actions get **| **delete _**ACTISPEC_ **tc **[ _TC_OPTIONS_ ] **actions flush _**ACTNAMESPEC_ **tc **[ _TC_OPTIONS_ ] **actions ls **| **list _**ACTNAMESPEC_ [ _ACTFILTER_ ] _ACTSPEC_ := **action _**ACTDETAIL_ [ _INDEXSPEC_ ] [ _COOKIESPEC_ ] [ _FLAGS_ ] [ _HWSTATSSPEC_ ] [ _CONTROL_ ] [ _SKIPSPEC_ ] _ACTISPEC_ := _ACTNAMESPEC_ _INDEXSPEC_ _ACTNAMESPEC_ := **action **ACTNAME _INDEXSPEC_ := **index _**INDEX_ _ACTFILTER_ := **since _**MSTIME_ _COOKIESPEC_ := **cookie _**COOKIE_ _FLAGS_ := _no_percpu_ _HWSTATSSPEC_ := **hw_stats **{ _immediate_ | _delayed_ | _disabled_ } _ACTDETAIL_ := _ACTNAME_ _ACTPARAMS_ _ACTNAME_ may be any valid action type: gact, mirred, bpf, connmark, csum, police, etc. _MSTIME_ Time since last update. _CONTROL_ := { _reclassify_ | _pipe_ | _drop_ | _continue_ | _ok_ } _SKIPSPEC_ := { _skip_sw_ | _skip_hw_ } _TC_OPTIONS_ These are the options that are specific to **tc **and not only the options. Refer to [**tc(8)](https://www.chedong.com/phpMan.php/man/tc/8/markdown) **for more information. ## DESCRIPTION The **actions **object in **tc **allows a user to define actions independently of a classifier (fil‐ ter). These actions can then be assigned to one or more filters, with any packets matching the classifier's criteria having that action performed on them. Each action type (mirred, police, etc.) will have its own table to store all created actions. ## OPERATIONS **add **Create a new action in that action's table. ### change ### replace Make modifications to an existing action. **get **Display the action with the specified index value. When combined with the **-s **option for **tc**, display the statistics for that action. **delete **Delete the action with the specified index value. If the action is already associated with a classifier, it does not delete the classifier. **ls** **list **List all the actions in the specified table. When combined with the **-s **option for **tc**, display the statistics for all actions in the specified table. When combined with the option **since **allows doing a millisecond time-filter since the last time an action was used in the datapath. **flush **Delete all actions stored in the specified table. ## ACTION OPTIONS Note that these options are available to all action types. **index _**INDEX_ Specify the table index value of an action. _INDEX_ is a 32-bit value that is unique to the specific type of action referenced. For **add**, **change**, and **replace **operations, the index is **optional. **When adding a new ac‐ tion, specifying an index value will assign the action to that index unless that index value has already been assigned. Omitting the index value for an add operation will cause the kernel to assign a value to the new action. For **get **and **delete **operations, the index is **required **to identify the specific action to be displayed or deleted. **cookie _**COOKIE_ In addition to the specific action, mark the matching packet with the value specified by _COOKIE_. The _COOKIE_ is a 128-bit value that will not be interpreted by the kernel whatsoever. As such, it can be used as a correlating value for maintaining user state. The value to be stored is completely arbitrary and does not require a specific format. It is stored inside the action structure itself. _FLAGS_ Action-specific flags. Currently, the only supported flag is _no_percpu_ which indicates that action is expected to have minimal software data-path traffic and doesn't need to allocate stat counters with percpu allocator. This option is intended to be used by hardware-offloaded actions. **hw_stats _**HW_STATS_ Specifies the type of HW stats of new action. If omitted, any stats counter type is going to be used, according to driver and its resources. The _HW_STATS_ indicates the type. Any of the following are valid: **immediate** Means that in dump, user gets the current HW stats state from the device queried at the dump time. **delayed** Means that in dump, user gets HW stats that might be out of date for some time, maybe couple of seconds. This is the case when driver polls stats updates peri‐ odically or when it gets async stats update from the device. **disabled** No HW stats are going to be available in dump. **since _**MSTIME_ When dumping large number of actions, a millisecond time-filter can be specified _MSTIME_. The _MSTIME_ is a millisecond count since last time a packet hit the action. As an example specifying "since 20000" implies to dump all actions that have seen packets in the last 20 seconds. This option is useful when the kernel has a large num‐ ber of actions and you are only interested in recently used actions. _CONTROL_ The _CONTROL_ indicates how **tc **should proceed after executing the action. Any of the following are valid: **reclassify** Restart the classifiction by jumping back to the first filter attached to the action's parent. **pipe **Continue with the next action. This is the default control. **drop **Drop the packed without running any further actions. **continue** Continue the classification with the next filter. **pass **Return to the calling qdisc for packet processing, and end classification of this packet. _SKIPSPEC_ The _SKIPSPEC_ indicates how **tc **should proceed when executing the action. Any of the following are valid: **skip_sw** Do not process action by software. If hardware has no offload support for this action, operation will fail. **skip_hw** Do not process action by hardware. ## SEE ALSO [**tc**(8)](https://www.chedong.com/phpMan.php/man/tc/8/markdown), [**tc-bpf**(8)](https://www.chedong.com/phpMan.php/man/tc-bpf/8/markdown), [**tc-connmark**(8)](https://www.chedong.com/phpMan.php/man/tc-connmark/8/markdown), [**tc-csum**(8)](https://www.chedong.com/phpMan.php/man/tc-csum/8/markdown), [**tc-ife**(8)](https://www.chedong.com/phpMan.php/man/tc-ife/8/markdown), [**tc-mirred**(8)](https://www.chedong.com/phpMan.php/man/tc-mirred/8/markdown), [**tc-nat**(8)](https://www.chedong.com/phpMan.php/man/tc-nat/8/markdown), **tc-** [**pedit**(8)](https://www.chedong.com/phpMan.php/man/pedit/8/markdown), [**tc-police**(8)](https://www.chedong.com/phpMan.php/man/tc-police/8/markdown), [**tc-simple**(8)](https://www.chedong.com/phpMan.php/man/tc-simple/8/markdown), [**tc-skbedit**(8)](https://www.chedong.com/phpMan.php/man/tc-skbedit/8/markdown), [**tc-skbmod**(8)](https://www.chedong.com/phpMan.php/man/tc-skbmod/8/markdown), [**tc-tunnel_key**(8)](https://www.chedong.com/phpMan.php/man/tc-tunnelkey/8/markdown), **tc-** [**vlan**(8)](https://www.chedong.com/phpMan.php/man/vlan/8/markdown), [**tc-xt**(8)](https://www.chedong.com/phpMan.php/man/tc-xt/8/markdown) iproute2 1 Aug 2017 _actions_ _in_ [_tc_(8)](https://www.chedong.com/phpMan.php/man/tc/8/markdown)