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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2023-08-07 22:33:16 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-08-10 01:59:20 +0300 |
| commit | 98766add2d55194be9f7d88628a058ceab3b06e6 (patch) | |
| tree | 5462e9d0d6a67e431efa147e4c949433f723e71f /net/sched | |
| parent | 25b0d4e4e41fcf0d2f43c431a82d344149e91258 (diff) | |
| download | linux-98766add2d55194be9f7d88628a058ceab3b06e6.tar.xz | |
net/sched: taprio: try again to report q->qdiscs[] to qdisc_leaf()
This is another stab at commit 1461d212ab27 ("net/sched: taprio: make
qdisc_leaf() see the per-netdev-queue pfifo child qdiscs"), later
reverted in commit af7b29b1deaa ("Revert "net/sched: taprio: make
qdisc_leaf() see the per-netdev-queue pfifo child qdiscs"").
I believe that the problems that caused the revert were fixed, and thus,
this change is identical to the original patch.
Its purpose is to properly reject attaching a software taprio child
qdisc to a software taprio parent. Because unoffloaded taprio currently
reports itself (the root Qdisc) as the return value from qdisc_leaf(),
then the process of attaching another taprio as child to a Qdisc class
of the root will just result in a Qdisc_ops :: change() call for the
root. Whereas that's not we want. We want Qdisc_ops :: init() to be
called for the taprio child, in order to give the taprio child a chance
to check whether its sch->parent is TC_H_ROOT or not (and reject this
configuration).
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20230807193324.4128292-4-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_taprio.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c index 7c1fc3dc3e55..831e6f3fda2a 100644 --- a/net/sched/sch_taprio.c +++ b/net/sched/sch_taprio.c @@ -2453,12 +2453,14 @@ start_error: static struct Qdisc *taprio_leaf(struct Qdisc *sch, unsigned long cl) { - struct netdev_queue *dev_queue = taprio_queue_get(sch, cl); + struct taprio_sched *q = qdisc_priv(sch); + struct net_device *dev = qdisc_dev(sch); + unsigned int ntx = cl - 1; - if (!dev_queue) + if (ntx >= dev->num_tx_queues) return NULL; - return rtnl_dereference(dev_queue->qdisc_sleeping); + return q->qdiscs[ntx]; } static unsigned long taprio_find(struct Qdisc *sch, u32 classid) |