From: Vladimir Oltean <vladimir.oltean@nxp.com> To: netdev@vger.kernel.org Cc: "David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, Jamal Hadi Salim <jhs@mojatatu.com>, Cong Wang <xiyou.wangcong@gmail.com>, Jiri Pirko <jiri@resnulli.us>, Vinicius Costa Gomes <vinicius.gomes@intel.com>, Kurt Kanzenbach <kurt@linutronix.de>, Jacob Keller <jacob.e.keller@intel.com>, Gerhard Engleder <gerhard@engleder-embedded.com>, Jesse Brandeburg <jesse.brandeburg@intel.com>, Tony Nguyen <anthony.l.nguyen@intel.com>, intel-wired-lan@lists.osuosl.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 net-next 01/15] net/sched: taprio: delete peek() implementation Date: Tue, 7 Feb 2023 15:54:26 +0200 [thread overview] Message-ID: <20230207135440.1482856-2-vladimir.oltean@nxp.com> (raw) In-Reply-To: <20230207135440.1482856-1-vladimir.oltean@nxp.com> There isn't any code in the network stack which calls taprio_peek(). We only see qdisc->ops->peek() being called on child qdiscs of other classful qdiscs, never from the generic qdisc code. Whereas taprio is never a child qdisc, it is always root. This snippet of a comment from qdisc_peek_dequeued() seems to confirm: /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ Since I've been known to be wrong many times though, I'm not completely removing it, but leaving a stub function in place which emits a warning. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> --- v1->v2: none net/sched/sch_taprio.c | 43 +----------------------------------------- 1 file changed, 1 insertion(+), 42 deletions(-) diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c index 1c95785932b9..d9e26ddaa7f2 100644 --- a/net/sched/sch_taprio.c +++ b/net/sched/sch_taprio.c @@ -499,50 +499,9 @@ static int taprio_enqueue(struct sk_buff *skb, struct Qdisc *sch, return taprio_enqueue_one(skb, sch, child, to_free); } -/* Will not be called in the full offload case, since the TX queues are - * attached to the Qdisc created using qdisc_create_dflt() - */ static struct sk_buff *taprio_peek(struct Qdisc *sch) { - struct taprio_sched *q = qdisc_priv(sch); - struct net_device *dev = qdisc_dev(sch); - struct sched_entry *entry; - struct sk_buff *skb; - u32 gate_mask; - int i; - - rcu_read_lock(); - entry = rcu_dereference(q->current_entry); - gate_mask = entry ? entry->gate_mask : TAPRIO_ALL_GATES_OPEN; - rcu_read_unlock(); - - if (!gate_mask) - return NULL; - - for (i = 0; i < dev->num_tx_queues; i++) { - struct Qdisc *child = q->qdiscs[i]; - int prio; - u8 tc; - - if (unlikely(!child)) - continue; - - skb = child->ops->peek(child); - if (!skb) - continue; - - if (TXTIME_ASSIST_IS_ENABLED(q->flags)) - return skb; - - prio = skb->priority; - tc = netdev_get_prio_tc_map(dev, prio); - - if (!(gate_mask & BIT(tc))) - continue; - - return skb; - } - + WARN_ONCE(1, "taprio only supports operating as root qdisc, peek() not implemented"); return NULL; } -- 2.34.1
WARNING: multiple messages have this Message-ID (diff)
From: Vladimir Oltean <vladimir.oltean@nxp.com> To: netdev@vger.kernel.org Cc: Jiri Pirko <jiri@resnulli.us>, intel-wired-lan@lists.osuosl.org, Kurt Kanzenbach <kurt@linutronix.de>, Jamal Hadi Salim <jhs@mojatatu.com>, Jesse Brandeburg <jesse.brandeburg@intel.com>, Gerhard Engleder <gerhard@engleder-embedded.com>, Eric Dumazet <edumazet@google.com>, Tony Nguyen <anthony.l.nguyen@intel.com>, Cong Wang <xiyou.wangcong@gmail.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, "David S. Miller" <davem@davemloft.net>, linux-kernel@vger.kernel.org Subject: [Intel-wired-lan] [PATCH v2 net-next 01/15] net/sched: taprio: delete peek() implementation Date: Tue, 7 Feb 2023 15:54:26 +0200 [thread overview] Message-ID: <20230207135440.1482856-2-vladimir.oltean@nxp.com> (raw) In-Reply-To: <20230207135440.1482856-1-vladimir.oltean@nxp.com> There isn't any code in the network stack which calls taprio_peek(). We only see qdisc->ops->peek() being called on child qdiscs of other classful qdiscs, never from the generic qdisc code. Whereas taprio is never a child qdisc, it is always root. This snippet of a comment from qdisc_peek_dequeued() seems to confirm: /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ Since I've been known to be wrong many times though, I'm not completely removing it, but leaving a stub function in place which emits a warning. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> --- v1->v2: none net/sched/sch_taprio.c | 43 +----------------------------------------- 1 file changed, 1 insertion(+), 42 deletions(-) diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c index 1c95785932b9..d9e26ddaa7f2 100644 --- a/net/sched/sch_taprio.c +++ b/net/sched/sch_taprio.c @@ -499,50 +499,9 @@ static int taprio_enqueue(struct sk_buff *skb, struct Qdisc *sch, return taprio_enqueue_one(skb, sch, child, to_free); } -/* Will not be called in the full offload case, since the TX queues are - * attached to the Qdisc created using qdisc_create_dflt() - */ static struct sk_buff *taprio_peek(struct Qdisc *sch) { - struct taprio_sched *q = qdisc_priv(sch); - struct net_device *dev = qdisc_dev(sch); - struct sched_entry *entry; - struct sk_buff *skb; - u32 gate_mask; - int i; - - rcu_read_lock(); - entry = rcu_dereference(q->current_entry); - gate_mask = entry ? entry->gate_mask : TAPRIO_ALL_GATES_OPEN; - rcu_read_unlock(); - - if (!gate_mask) - return NULL; - - for (i = 0; i < dev->num_tx_queues; i++) { - struct Qdisc *child = q->qdiscs[i]; - int prio; - u8 tc; - - if (unlikely(!child)) - continue; - - skb = child->ops->peek(child); - if (!skb) - continue; - - if (TXTIME_ASSIST_IS_ENABLED(q->flags)) - return skb; - - prio = skb->priority; - tc = netdev_get_prio_tc_map(dev, prio); - - if (!(gate_mask & BIT(tc))) - continue; - - return skb; - } - + WARN_ONCE(1, "taprio only supports operating as root qdisc, peek() not implemented"); return NULL; } -- 2.34.1 _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan
next prev parent reply other threads:[~2023-02-07 13:55 UTC|newest] Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-02-07 13:54 [PATCH v2 net-next 00/15] taprio automatic queueMaxSDU and new TXQ selection procedure Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] " Vladimir Oltean 2023-02-07 13:54 ` Vladimir Oltean [this message] 2023-02-07 13:54 ` [Intel-wired-lan] [PATCH v2 net-next 01/15] net/sched: taprio: delete peek() implementation Vladimir Oltean 2023-02-07 13:54 ` [PATCH v2 net-next 02/15] net/sched: taprio: continue with other TXQs if one dequeue() failed Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] " Vladimir Oltean 2023-02-07 13:54 ` [PATCH v2 net-next 03/15] net/sched: taprio: refactor one skb dequeue from TXQ to separate function Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] " Vladimir Oltean 2023-02-07 13:54 ` [PATCH v2 net-next 04/15] net/sched: taprio: avoid calling child->ops->dequeue(child) twice Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] " Vladimir Oltean 2023-02-07 13:54 ` [PATCH v2 net-next 05/15] net/sched: taprio: give higher priority to higher TCs in software dequeue mode Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] " Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] [PATCH v2 net-next 06/15] net/sched: taprio: calculate tc gate durations Vladimir Oltean 2023-02-07 13:54 ` Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] [PATCH v2 net-next 07/15] net/sched: taprio: rename close_time to end_time Vladimir Oltean 2023-02-07 13:54 ` Vladimir Oltean 2023-02-07 13:54 ` [PATCH v2 net-next 08/15] net/sched: taprio: calculate budgets per traffic class Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] " Vladimir Oltean 2023-02-07 13:54 ` [PATCH v2 net-next 09/15] net/sched: taprio: calculate guard band against actual TC gate close time Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] " Vladimir Oltean 2023-02-07 13:54 ` [PATCH v2 net-next 10/15] net/sched: make stab available before ops->init() call Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] " Vladimir Oltean 2023-02-10 15:07 ` Eric Dumazet 2023-02-10 15:07 ` [Intel-wired-lan] " Eric Dumazet 2023-02-10 15:20 ` Vladimir Oltean 2023-02-10 15:20 ` [Intel-wired-lan] " Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] [PATCH v2 net-next 11/15] net/sched: taprio: warn about missing size table Vladimir Oltean 2023-02-07 13:54 ` Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] [PATCH v2 net-next 12/15] net/sched: keep the max_frm_len information inside struct sched_gate_list Vladimir Oltean 2023-02-07 13:54 ` Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] [PATCH v2 net-next 13/15] net/sched: taprio: automatically calculate queueMaxSDU based on TC gate durations Vladimir Oltean 2023-02-07 13:54 ` Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] [PATCH v2 net-next 14/15] net/sched: taprio: split segmentation logic from qdisc_enqueue() Vladimir Oltean 2023-02-07 13:54 ` Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] [PATCH v2 net-next 15/15] net/sched: taprio: don't segment unnecessarily Vladimir Oltean 2023-02-07 13:54 ` Vladimir Oltean 2023-02-08 9:50 ` [PATCH v2 net-next 00/15] taprio automatic queueMaxSDU and new TXQ selection procedure patchwork-bot+netdevbpf 2023-02-08 9:50 ` [Intel-wired-lan] " patchwork-bot+netdevbpf
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