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Diffstat (limited to 'Documentation/networking/tc-queue-filters.rst')
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diff --git a/Documentation/networking/tc-queue-filters.rst b/Documentation/networking/tc-queue-filters.rst new file mode 100644 index 000000000000..6b417092276f --- /dev/null +++ b/Documentation/networking/tc-queue-filters.rst @@ -0,0 +1,37 @@ +.. SPDX-License-Identifier: GPL-2.0 + +========================= +TC queue based filtering +========================= + +TC can be used for directing traffic to either a set of queues or +to a single queue on both the transmit and receive side. + +On the transmit side: + +1) TC filter directing traffic to a set of queues is achieved + using the action skbedit priority for Tx priority selection, + the priority maps to a traffic class (set of queues) when + the queue-sets are configured using mqprio. + +2) TC filter directs traffic to a transmit queue with the action + skbedit queue_mapping $tx_qid. The action skbedit queue_mapping + for transmit queue is executed in software only and cannot be + offloaded. + +Likewise, on the receive side, the two filters for selecting set of +queues and/or a single queue are supported as below: + +1) TC flower filter directs incoming traffic to a set of queues using + the 'hw_tc' option. + hw_tc $TCID - Specify a hardware traffic class to pass matching + packets on to. TCID is in the range 0 through 15. + +2) TC filter with action skbedit queue_mapping $rx_qid selects a + receive queue. The action skbedit queue_mapping for receive queue + is supported only in hardware. Multiple filters may compete in + the hardware for queue selection. In such case, the hardware + pipeline resolves conflicts based on priority. On Intel E810 + devices, TC filter directing traffic to a queue have higher + priority over flow director filter assigning a queue. The hash + filter has lowest priority. |