netdev - [PATCH iproute2 net-next v1 6/6] tc: taprio: Update documentation

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Message-Id: <1559065974-28521-6-git-send-email-vedang.patel@intel.com>
Date:   Tue, 28 May 2019 10:52:54 -0700
From:   Vedang Patel <vedang.patel@...el.com>
To:     netdev@...r.kernel.org
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        stephen@...workplumber.org, vinicius.gomes@...el.com,
        leandro.maciel.dorileo@...el.com,
        Vedang Patel <vedang.patel@...el.com>
Subject: [PATCH iproute2 net-next v1 6/6] tc: taprio: Update documentation

Add documentation for the latest options, offload and txtime-delay, to the
taprio manpage.

This also adds an example to run tc in txtime offload mode.

Signed-off-by: Vedang Patel <vedang.patel@...el.com>
---
 man/man8/tc-taprio.8 | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/man/man8/tc-taprio.8 b/man/man8/tc-taprio.8
index 850be9b0..5209c6ad 100644
--- a/man/man8/tc-taprio.8
+++ b/man/man8/tc-taprio.8
@@ -112,6 +112,23 @@ means that traffic class 0 is "active" for that schedule entry.
 long that state defined by <command> and <gate mask> should be held
 before moving to the next entry.
 
+.TP
+offload
+.br
+Specifies the offload mode for taprio. If set to 1, it will try to offload the
+schedule to be run on the network controller. Hardware and driver support
+needed. If set to 2, txtime offload mode is enabled which will
+utilize the ETF qdisc to set the transmit of the packets.
+
+.TP
+txtime-delay
+.br
+This parameter is specific to the txtime offload mode. It specifies the maximum
+time a packet might take to reach the network card from the taprio qdisc. The
+value should always be greater than the delta specified in the
+.BR etf(8)
+qdisc.
+
 .SH EXAMPLES
 
 The following example shows how an traffic schedule with three traffic
@@ -137,6 +154,26 @@ reference CLOCK_TAI. The schedule is composed of three entries each of
               clockid CLOCK_TAI
 .EE
 
+Following is an example to enable the txtime offload mode in taprio. See
+.BR etf(8)
+for more information about configuring the ETF qdisc.
+
+.EX
+# tc qdisc replace dev eth0 parent root handle 100 taprio \\
+              num_tc 3 \\
+              map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \\
+              queues 1@0 1@0 1@0 \\
+              base-time 1528743495910289987 \\
+              sched-entry S 01 300000 \\
+              sched-entry S 02 300000 \\
+              sched-entry S 04 400000 \\
+              offload 2 \\
+              txtime-delay 200000 \\
+              clockid CLOCK_TAI
+
+# tc qdisc replace dev $IFACE parent 100:1 etf skip_skb_check \\
+              offload delta 200000 clockid CLOCK_TAI
+.EE
 
 .SH AUTHORS
 Vinicius Costa Gomes <vinicius.gomes@...el.com>
-- 
2.17.0