1 .. SPDX-License-Identifier: GPL-2.0
3 =========================
4 TC queue based filtering
5 =========================
7 TC can be used for directing traffic to either a set of queues or
8 to a single queue on both the transmit and receive side.
12 1) TC filter directing traffic to a set of queues is achieved
13 using the action skbedit priority for Tx priority selection,
14 the priority maps to a traffic class (set of queues) when
15 the queue-sets are configured using mqprio.
17 2) TC filter directs traffic to a transmit queue with the action
18 skbedit queue_mapping $tx_qid. The action skbedit queue_mapping
19 for transmit queue is executed in software only and cannot be
22 Likewise, on the receive side, the two filters for selecting set of
23 queues and/or a single queue are supported as below:
25 1) TC flower filter directs incoming traffic to a set of queues using
27 hw_tc $TCID - Specify a hardware traffic class to pass matching
28 packets on to. TCID is in the range 0 through 15.
30 2) TC filter with action skbedit queue_mapping $rx_qid selects a
31 receive queue. The action skbedit queue_mapping for receive queue
32 is supported only in hardware. Multiple filters may compete in
33 the hardware for queue selection. In such case, the hardware
34 pipeline resolves conflicts based on priority. On Intel E810
35 devices, TC filter directing traffic to a queue have higher
36 priority over flow director filter assigning a queue. The hash
37 filter has lowest priority.