netdev - [PATCH iproute2-next 1/2] tc: Add missing documentation for codel and fq

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Date:   Thu,  8 Mar 2018 23:31:36 +0100
From:   Toke Høiland-Jørgensen <toke@...e.dk>
To:     netdev@...r.kernel.org
Cc:     Toke Høiland-Jørgensen <toke@...e.dk>
Subject: [PATCH iproute2-next 1/2] tc: Add missing documentation for codel and fq_codel parameters

Add missing documentation of the memory_limit fq_codel parameter and the
ce_threshold codel and fq_codel parameters.

Signed-off-by: Toke Høiland-Jørgensen <toke@...e.dk>
---
 man/man8/tc-codel.8    | 10 +++++++++-
 man/man8/tc-fq_codel.8 | 18 +++++++++++++++++-
 tc/q_fq_codel.c        |  1 +
 3 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/man/man8/tc-codel.8 b/man/man8/tc-codel.8
index a0e50a4e..e538e940 100644
--- a/man/man8/tc-codel.8
+++ b/man/man8/tc-codel.8
@@ -13,7 +13,9 @@ TIME ] [
 .B ecn
 |
 .B noecn
-]
+] [
+.B ce_threshold
+TIME ]
 
 .SH DESCRIPTION
 CoDel (pronounced "coddle") is an adaptive "no-knobs" active queue management
@@ -80,6 +82,12 @@ can be used to turn it off and vice-a-versa. By default,
 .B ecn
 is turned off.
 
+.SS ce_threshold
+sets a threshold above which all packets are marked with ECN Congestion
+Experienced. This is useful for DCTCP-style congestion control algorithms that
+require marking at very shallow queueing thresholds.
+
+
 .SH EXAMPLES
  # tc qdisc add dev eth0 root codel
  # tc -s qdisc show
diff --git a/man/man8/tc-fq_codel.8 b/man/man8/tc-fq_codel.8
index a80389a1..7ee6c269 100644
--- a/man/man8/tc-fq_codel.8
+++ b/man/man8/tc-fq_codel.8
@@ -17,7 +17,11 @@ BYTES ] [
 .B ecn
 |
 .B noecn
-]
+] [
+.B ce_threshold
+TIME ] [
+.B memory_limit
+BYTES ]
 
 .SH DESCRIPTION
 FQ_Codel (Fair Queuing Controlled Delay) is queuing discipline that combines Fair
@@ -35,6 +39,13 @@ and is the hard limit on the real queue size.
 When this limit is reached, incoming packets are dropped. Default is 10240
 packets.
 
+.SS memory_limit
+sets a limit on the total number of bytes that can be queued in this FQ-CoDel
+instance. The lower of the packet limit of the
+.B limit
+parameter and the memory limit will be enforced. Default is 32 MB.
+
+
 .SS flows
 is the number of flows into which the incoming packets are classified. Due to
 the stochastic nature of hashing, multiple flows may end up being hashed into
@@ -73,6 +84,11 @@ can be used to turn it off and vice-a-versa. Unlike
 .B codel, ecn
 is turned on by default.
 
+.SS ce_threshold
+sets a threshold above which all packets are marked with ECN Congestion
+Experienced. This is useful for DCTCP-style congestion control algorithms that
+require marking at very shallow queueing thresholds.
+
 .SH EXAMPLES
 #tc qdisc add   dev eth0 root fq_codel
 .br
diff --git a/tc/q_fq_codel.c b/tc/q_fq_codel.c
index 9e3736fe..1b2931ef 100644
--- a/tc/q_fq_codel.c
+++ b/tc/q_fq_codel.c
@@ -50,6 +50,7 @@
 static void explain(void)
 {
 	fprintf(stderr, "Usage: ... fq_codel [ limit PACKETS ] [ flows NUMBER ]\n");
+	fprintf(stderr, "                    [ memory_limit BYTES ]\n");
 	fprintf(stderr, "                    [ target TIME ] [ interval TIME ]\n");
 	fprintf(stderr, "                    [ quantum BYTES ] [ [no]ecn ]\n");
 	fprintf(stderr, "                    [ ce_threshold TIME ]\n");
-- 
2.16.2