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author | Amritha Nambiar <amritha.nambiar@intel.com> | 2022-10-21 10:58:50 +0300 |
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committer | Paolo Abeni <pabeni@redhat.com> | 2022-10-25 11:32:40 +0300 |
commit | d5ae8ecf38322f2072bbd46ffd0d0adf309c11f2 (patch) | |
tree | 17770603add2bcfe695075d97f786f9eed75796e /Documentation | |
parent | 143b86f346c709d6fed661aee36cea70ef874815 (diff) | |
download | linux-d5ae8ecf38322f2072bbd46ffd0d0adf309c11f2.tar.xz |
Documentation: networking: TC queue based filtering
Add tc-queue-filters.rst with notes on TC filters for
selecting a set of queues and/or a queue.
Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/networking/index.rst | 1 | ||||
-rw-r--r-- | Documentation/networking/tc-queue-filters.rst | 37 |
2 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst index 16a153bcc5fe..4f2d1f682a18 100644 --- a/Documentation/networking/index.rst +++ b/Documentation/networking/index.rst @@ -104,6 +104,7 @@ Contents: switchdev sysfs-tagging tc-actions-env-rules + tc-queue-filters tcp-thin team timestamping 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. |