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selftests/tc-testing: verify that a qdisc can be grafted onto a taprio class

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The reason behind commit af7b29b1de ("Revert "net/sched: taprio: make
qdisc_leaf() see the per-netdev-queue pfifo child qdiscs"") was that the
patch it reverted caused a crash when attaching a CBS shaper to one of
the taprio classes. Prevent that from happening again by adding a test
case for it, which now passes correctly in both offload and software
modes.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Link: https://lore.kernel.org/r/20230807193324.4128292-12-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean 2023-08-07 22:33:24 +03:00 committed by Jakub Kicinski
parent 1890cf08bd
commit 29c298d2bc
1 changed files with 50 additions and 0 deletions
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50
tools/testing/selftests/tc-testing/tc-tests/qdiscs/taprio.json
View file

@ -206,5 +206,55 @@
"$TC qdisc del dev $ETH root",
"echo \"1\" > /sys/bus/netdevsim/del_device"
]
},
{
"id": "a7bf",
"name": "Graft cbs as child of software taprio",
"category": [
"qdisc",
"taprio",
"cbs"
],
"plugins": {
"requires": "nsPlugin"
},
"setup": [
"echo \"1 1 8\" > /sys/bus/netdevsim/new_device",
"$TC qdisc replace dev $ETH handle 8001: parent root stab overhead 24 taprio num_tc 8 map 0 1 2 3 4 5 6 7 queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 base-time 0 sched-entry S ff 20000000 clockid CLOCK_TAI"
],
"cmdUnderTest": "$TC qdisc replace dev $ETH handle 8002: parent 8001:8 cbs idleslope 20000 sendslope -980000 hicredit 30 locredit -1470",
"expExitCode": "0",
"verifyCmd": "$TC -d qdisc show dev $ETH",
"matchPattern": "qdisc cbs 8002: parent 8001:8 hicredit 30 locredit -1470 sendslope -980000 idleslope 20000 offload 0",
"matchCount": "1",
"teardown": [
"$TC qdisc del dev $ETH root",
"echo \"1\" > /sys/bus/netdevsim/del_device"
]
},
{
"id": "6a83",
"name": "Graft cbs as child of offloaded taprio",
"category": [
"qdisc",
"taprio",
"cbs"
],
"plugins": {
"requires": "nsPlugin"
},
"setup": [
"echo \"1 1 8\" > /sys/bus/netdevsim/new_device",
"$TC qdisc replace dev $ETH handle 8001: parent root stab overhead 24 taprio num_tc 8 map 0 1 2 3 4 5 6 7 queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 base-time 0 sched-entry S ff 20000000 flags 0x2"
],
"cmdUnderTest": "$TC qdisc replace dev $ETH handle 8002: parent 8001:8 cbs idleslope 20000 sendslope -980000 hicredit 30 locredit -1470",
"expExitCode": "0",
"verifyCmd": "$TC -d qdisc show dev $ETH",
"matchPattern": "qdisc cbs 8002: parent 8001:8 refcnt 2 hicredit 30 locredit -1470 sendslope -980000 idleslope 20000 offload 0",
"matchCount": "1",
"teardown": [
"$TC qdisc del dev $ETH root",
"echo \"1\" > /sys/bus/netdevsim/del_device"
]
}
]