net/sched: Retire ATM qdisc

The ATM qdisc has served us well over the years but has not been getting much
TLC due to lack of known users. 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

@@ -68,20 +68,6 @@ config NET_SCH_HFSC
 	  To compile this code as a module, choose M here: the
 	  module will be called sch_hfsc.
 
-config NET_SCH_ATM
-	tristate "ATM Virtual Circuits (ATM)"
-	depends on ATM
-	help
-	  Say Y here if you want to use the ATM pseudo-scheduler.  This
-	  provides a framework for invoking classifiers, which in turn
-	  select classes of this queuing discipline.  Each class maps
-	  the flow(s) it is handling to a given virtual circuit.
-
-	  See the top of <file:net/sched/sch_atm.c> for more details.
-
-	  To compile this code as a module, choose M here: the
-	  module will be called sch_atm.
-
 config NET_SCH_PRIO
 	tristate "Multi Band Priority Queueing (PRIO)"
 	help

net/sched/Makefile

@@ -45,7 +45,6 @@ obj-$(CONFIG_NET_SCH_TBF)	+= sch_tbf.o
 obj-$(CONFIG_NET_SCH_TEQL)	+= sch_teql.o
 obj-$(CONFIG_NET_SCH_PRIO)	+= sch_prio.o
 obj-$(CONFIG_NET_SCH_MULTIQ)	+= sch_multiq.o
-obj-$(CONFIG_NET_SCH_ATM)	+= sch_atm.o
 obj-$(CONFIG_NET_SCH_NETEM)	+= sch_netem.o
 obj-$(CONFIG_NET_SCH_DRR)	+= sch_drr.o
 obj-$(CONFIG_NET_SCH_PLUG)	+= sch_plug.o

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

-[
-    {
-        "id": "7628",
-        "name": "Create ATM with default setting",
-        "category": [
-            "qdisc",
-            "atm"
-        ],
-        "plugins": {
-            "requires": "nsPlugin"
-        },
-        "setup": [
-            "$IP link add dev $DUMMY type dummy || /bin/true"
-        ],
-        "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root atm",
-        "expExitCode": "0",
-        "verifyCmd": "$TC qdisc show dev $DUMMY",
-        "matchPattern": "qdisc atm 1: root refcnt",
-        "matchCount": "1",
-        "teardown": [
-            "$TC qdisc del dev $DUMMY handle 1: root",
-            "$IP link del dev $DUMMY type dummy"
-        ]
-    },
-    {
-        "id": "390a",
-        "name": "Delete ATM with valid handle",
-        "category": [
-            "qdisc",
-            "atm"
-        ],
-        "plugins": {
-            "requires": "nsPlugin"
-        },
-        "setup": [
-            "$IP link add dev $DUMMY type dummy || /bin/true",
-            "$TC qdisc add dev $DUMMY handle 1: root atm"
-        ],
-        "cmdUnderTest": "$TC qdisc del dev $DUMMY handle 1: root",
-        "expExitCode": "0",
-        "verifyCmd": "$TC qdisc show dev $DUMMY",
-        "matchPattern": "qdisc atm 1: root refcnt",
-        "matchCount": "0",
-        "teardown": [
-            "$IP link del dev $DUMMY type dummy"
-        ]
-    },
-    {
-        "id": "32a0",
-        "name": "Show ATM class",
-        "category": [
-            "qdisc",
-            "atm"
-        ],
-        "plugins": {
-            "requires": "nsPlugin"
-        },
-        "setup": [
-            "$IP link add dev $DUMMY type dummy || /bin/true"
-        ],
-        "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root atm",
-        "expExitCode": "0",
-        "verifyCmd": "$TC class show dev $DUMMY",
-        "matchPattern": "class atm 1: parent 1:",
-        "matchCount": "1",
-        "teardown": [
-            "$TC qdisc del dev $DUMMY handle 1: root",
-            "$IP link del dev $DUMMY type dummy"
-        ]
-    },
-    {
-        "id": "6310",
-        "name": "Dump ATM stats",
-        "category": [
-            "qdisc",
-            "atm"
-        ],
-        "plugins": {
-            "requires": "nsPlugin"
-        },
-        "setup": [
-            "$IP link add dev $DUMMY type dummy || /bin/true"
-        ],
-        "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root atm",
-        "expExitCode": "0",
-        "verifyCmd": "$TC -s qdisc show dev $DUMMY",
-        "matchPattern": "qdisc atm 1: root refcnt",
-        "matchCount": "1",
-        "teardown": [
-            "$TC qdisc del dev $DUMMY handle 1: root",
-            "$IP link del dev $DUMMY type dummy"
-        ]
-    }
-]