netdev - [net-next PATCH v2 4/4] Documentation: networking: TC queue based filtering

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Message-ID: <166260025920.81018.12730039389826735230.stgit@anambiarhost.jf.intel.com>
Date:   Wed, 07 Sep 2022 18:24:19 -0700
From:   Amritha Nambiar <amritha.nambiar@...el.com>
To:     netdev@...r.kernel.org, kuba@...nel.org
Cc:     alexander.duyck@...il.com, jhs@...atatu.com, jiri@...nulli.us,
        xiyou.wangcong@...il.com, vinicius.gomes@...el.com,
        sridhar.samudrala@...el.com, amritha.nambiar@...el.com
Subject: [net-next PATCH v2 4/4] Documentation: networking: TC queue based
 filtering

Added 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@...el.com>
---
 Documentation/networking/tc-queue-filters.rst |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/networking/tc-queue-filters.rst

diff --git a/Documentation/networking/tc-queue-filters.rst b/Documentation/networking/tc-queue-filters.rst
new file mode 100644
index 000000000000..5839ddd23eb4
--- /dev/null
+++ b/Documentation/networking/tc-queue-filters.rst
@@ -0,0 +1,24 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=========================
+TC queue based filtering
+=========================
+
+TC can be used for directing traffic to either a set of queues or
+on 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).
+2. TC filter directs traffic to a transmit queue with the action
+   skbedit queue_mapping $tx_qid.
+
+Likewise, on the receive side, the two filters for selecting set of
+queues and/or a single queue is supported as below:
+1. TC flower filter directs traffic to a set of queues using the
+   'hw_tc' option of tc-flower.
+   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.