net/sched: Retire dsmark qdisc

The dsmark qdisc has served us well over the years for diffserv but has not
been getting much attention due to other more popular approaches to do diffserv
services. Most recently it has become a shooting target for syzkaller. For this
reason, we are retiring it.
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

net/sched/Kconfig

@@ -192,17 +192,6 @@ config NET_SCH_GRED
 	  To compile this code as a module, choose M here: the
 	  module will be called sch_gred.
 
-config NET_SCH_DSMARK
-	tristate "Differentiated Services marker (DSMARK)"
-	help
-	  Say Y if you want to schedule packets according to the
-	  Differentiated Services architecture proposed in RFC 2475.
-	  Technical information on this method, with pointers to associated
-	  RFCs, is available at <http://www.gta.ufrj.br/diffserv/>.
-
-	  To compile this code as a module, choose M here: the
-	  module will be called sch_dsmark.
-
 config NET_SCH_NETEM
 	tristate "Network emulator (NETEM)"
 	help

net/sched/Makefile

@@ -38,7 +38,6 @@ obj-$(CONFIG_NET_SCH_HFSC)	+= sch_hfsc.o
 obj-$(CONFIG_NET_SCH_RED)	+= sch_red.o
 obj-$(CONFIG_NET_SCH_GRED)	+= sch_gred.o
 obj-$(CONFIG_NET_SCH_INGRESS)	+= sch_ingress.o
-obj-$(CONFIG_NET_SCH_DSMARK)	+= sch_dsmark.o
 obj-$(CONFIG_NET_SCH_SFB)	+= sch_sfb.o
 obj-$(CONFIG_NET_SCH_SFQ)	+= sch_sfq.o
 obj-$(CONFIG_NET_SCH_TBF)	+= sch_tbf.o

tools/testing/selftests/tc-testing/tc-tests/qdiscs/dsmark.json

-[
-    {
-        "id": "6345",
-        "name": "Create DSMARK with default setting",
-        "category": [
-            "qdisc",
-            "dsmark"
-        ],
-        "plugins": {
-            "requires": "nsPlugin"
-        },
-        "setup": [
-            "$IP link add dev $DUMMY type dummy || /bin/true"
-        ],
-        "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root dsmark indices 1024",
-        "expExitCode": "0",
-        "verifyCmd": "$TC qdisc show dev $DUMMY",
-        "matchPattern": "qdisc dsmark 1: root refcnt [0-9]+ indices 0x0400",
-        "matchCount": "1",
-        "teardown": [
-            "$TC qdisc del dev $DUMMY handle 1: root",
-            "$IP link del dev $DUMMY type dummy"
-        ]
-    },
-    {
-        "id": "3462",
-        "name": "Create DSMARK with default_index setting",
-        "category": [
-            "qdisc",
-            "dsmark"
-        ],
-        "plugins": {
-            "requires": "nsPlugin"
-        },
-        "setup": [
-            "$IP link add dev $DUMMY type dummy || /bin/true"
-        ],
-        "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root dsmark indices 1024 default_index 512",
-        "expExitCode": "0",
-        "verifyCmd": "$TC qdisc show dev $DUMMY",
-        "matchPattern": "qdisc dsmark 1: root refcnt [0-9]+ indices 0x0400 default_index 0x0200",
-        "matchCount": "1",
-        "teardown": [
-            "$TC qdisc del dev $DUMMY handle 1: root",
-            "$IP link del dev $DUMMY type dummy"
-        ]
-    },
-    {
-        "id": "ca95",
-        "name": "Create DSMARK with set_tc_index flag",
-        "category": [
-            "qdisc",
-            "dsmark"
-        ],
-        "plugins": {
-            "requires": "nsPlugin"
-        },
-        "setup": [
-            "$IP link add dev $DUMMY type dummy || /bin/true"
-        ],
-        "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root dsmark indices 1024 set_tc_index",
-        "expExitCode": "0",
-        "verifyCmd": "$TC qdisc show dev $DUMMY",
-        "matchPattern": "qdisc dsmark 1: root refcnt [0-9]+ indices 0x0400 set_tc_index",
-        "matchCount": "1",
-        "teardown": [
-            "$TC qdisc del dev $DUMMY handle 1: root",
-            "$IP link del dev $DUMMY type dummy"
-        ]
-    },
-    {
-        "id": "a950",
-        "name": "Create DSMARK with multiple setting",
-        "category": [
-            "qdisc",
-            "dsmark"
-        ],
-        "plugins": {
-            "requires": "nsPlugin"
-        },
-        "setup": [
-            "$IP link add dev $DUMMY type dummy || /bin/true"
-        ],
-        "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root dsmark indices 1024 default_index 1024 set_tc_index",
-        "expExitCode": "0",
-        "verifyCmd": "$TC qdisc show dev $DUMMY",
-        "matchPattern": "qdisc dsmark 1: root refcnt [0-9]+ indices 0x0400 default_index 0x0400 set_tc_index",
-        "matchCount": "1",
-        "teardown": [
-            "$TC qdisc del dev $DUMMY handle 1: root",
-            "$IP link del dev $DUMMY type dummy"
-        ]
-    },
-    {
-        "id": "4092",
-        "name": "Delete DSMARK with handle",
-        "category": [
-            "qdisc",
-            "dsmark"
-        ],
-        "plugins": {
-            "requires": "nsPlugin"
-        },
-        "setup": [
-            "$IP link add dev $DUMMY type dummy || /bin/true",
-            "$TC qdisc add dev $DUMMY handle 1: root dsmark indices 1024 default_index 1024"
-        ],
-        "cmdUnderTest": "$TC qdisc del dev $DUMMY handle 1: root",
-        "expExitCode": "0",
-        "verifyCmd": "$TC qdisc show dev $DUMMY",
-        "matchPattern": "qdisc dsmark 1: root refcnt [0-9]+ indices 0x0400",
-        "matchCount": "0",
-        "teardown": [
-            "$IP link del dev $DUMMY type dummy"
-        ]
-    },
-    {
-        "id": "5930",
-        "name": "Show DSMARK class",
-        "category": [
-            "qdisc",
-            "dsmark"
-        ],
-        "plugins": {
-            "requires": "nsPlugin"
-        },
-        "setup": [
-            "$IP link add dev $DUMMY type dummy || /bin/true"
-        ],
-        "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root dsmark indices 1024",
-        "expExitCode": "0",
-        "verifyCmd": "$TC class show dev $DUMMY",
-        "matchPattern": "class dsmark 1:",
-        "matchCount": "0",
-        "teardown": [
-            "$TC qdisc del dev $DUMMY handle 1: root",
-            "$IP link del dev $DUMMY type dummy"
-        ]
-    }
-]