netdev - [PATCH iproute2-next] sch_cake: Make gso-splitting configurable

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Message-Id: <1532728132-21081-1-git-send-email-dave.taht@gmail.com>
Date:   Fri, 27 Jul 2018 14:48:52 -0700
From:   Dave Taht <dave.taht@...il.com>
To:     netdev@...r.kernel.org
Cc:     Dave Taht <dave.taht@...il.com>,
        Toke Høiland-Jørgensen <toke@...e.dk>
Subject: [PATCH iproute2-next] sch_cake: Make gso-splitting configurable

This patch makes sch_cake's gso/gro splitting configurable
from userspace.

To disable breaking apart superpackets in sch_cake:

tc qdisc replace dev whatever root cake no-split-gso

to enable:

tc qdisc replace dev whatever root cake split-gso

Signed-off-by: Toke Høiland-Jørgensen <toke@...e.dk>
Signed-off-by: Dave Taht <dave.taht@...il.com>

---
 tc/q_cake.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tc/q_cake.c b/tc/q_cake.c
index f1e232a..727d673 100644
--- a/tc/q_cake.c
+++ b/tc/q_cake.c
@@ -79,6 +79,7 @@ static void explain(void)
 "                  dual-srchost | dual-dsthost | triple-isolate* ]\n"
 "                [ nat | nonat* ]\n"
 "                [ wash | nowash* ]\n"
+"                [ split-gso* | no-split-gso ]\n"
 "                [ ack-filter | ack-filter-aggressive | no-ack-filter* ]\n"
 "                [ memlimit LIMIT ]\n"
 "                [ ptm | atm | noatm* ] [ overhead N | conservative | raw* ]\n"
@@ -108,6 +109,7 @@ static int cake_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 	int nat = -1;
 	int atm = -1;
 	int mpu = 0;
+	int split_gso = -1;
 
 	while (argc > 0) {
 		if (strcmp(*argv, "bandwidth") == 0) {
@@ -155,6 +157,10 @@ static int cake_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 			wash = 0;
 		} else if (strcmp(*argv, "wash") == 0) {
 			wash = 1;
+		} else if (strcmp(*argv, "split-gso") == 0) {
+			split_gso = 1;
+		} else if (strcmp(*argv, "no-split-gso") == 0) {
+			split_gso = 0;
 		} else if (strcmp(*argv, "flowblind") == 0) {
 			flowmode = CAKE_FLOW_NONE;
 		} else if (strcmp(*argv, "srchost") == 0) {
@@ -374,6 +380,9 @@ static int cake_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 		addattr_l(n, 1024, TCA_CAKE_NAT, &nat, sizeof(nat));
 	if (wash != -1)
 		addattr_l(n, 1024, TCA_CAKE_WASH, &wash, sizeof(wash));
+	if (split_gso != -1)
+		addattr_l(n, 1024, TCA_CAKE_SPLIT_GSO, &split_gso,
+			  sizeof(split_gso));
 	if (ingress != -1)
 		addattr_l(n, 1024, TCA_CAKE_INGRESS, &ingress, sizeof(ingress));
 	if (ack_filter != -1)
-- 
2.7.4