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Merge branch 'fixes-for-tc-taprio-software-mode'

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Vladimir Oltean says:

====================
Fixes for tc-taprio software mode

While working on some new features for tc-taprio, I found some strange
behavior which looked like bugs. I was able to eventually trigger a NULL
pointer dereference. This patch set fixes 2 issues I saw. Detailed
explanation in patches.
====================

Link: https://lore.kernel.org/r/20220915100802.2308279-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2022-09-20 11:41:17 -07:00
commit da847246ab
1 changed files with 11 additions and 7 deletions
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18
net/sched/sch_taprio.c
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@ -67,6 +67,7 @@ struct taprio_sched {
u32 flags;
enum tk_offsets tk_offset;
int clockid;
bool offloaded;
atomic64_t picos_per_byte; /* Using picoseconds because for 10Gbps+
* speeds it's sub-nanoseconds per byte
*/
@ -1279,6 +1280,8 @@ static int taprio_enable_offload(struct net_device *dev,
goto done;
}
q->offloaded = true;
done:
taprio_offload_free(offload);
@ -1293,12 +1296,9 @@ static int taprio_disable_offload(struct net_device *dev,
struct tc_taprio_qopt_offload *offload;
int err;
if (!FULL_OFFLOAD_IS_ENABLED(q->flags))
if (!q->offloaded)
return 0;
if (!ops->ndo_setup_tc)
return -EOPNOTSUPP;
offload = taprio_offload_alloc(0);
if (!offload) {
NL_SET_ERR_MSG(extack,
@ -1314,6 +1314,8 @@ static int taprio_disable_offload(struct net_device *dev,
goto out;
}
q->offloaded = false;
out:
taprio_offload_free(offload);
@ -1949,12 +1951,14 @@ 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 dev_queue->qdisc_sleeping;
return q->qdiscs[ntx];
}
static unsigned long taprio_find(struct Qdisc *sch, u32 classid)