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 10/15] net/sched: make stab available before ops->init() call Date: Tue, 7 Feb 2023 15:54:35 +0200 [thread overview] Message-ID: <20230207135440.1482856-11-vladimir.oltean@nxp.com> (raw) In-Reply-To: <20230207135440.1482856-1-vladimir.oltean@nxp.com> Some qdiscs like taprio turn out to be actually pretty reliant on a well configured stab, to not underestimate the skb transmission time (by properly accounting for L1 overhead). In a future change, taprio will need the stab, if configured by the user, to be available at ops->init() time. It will become even more important in upcoming work, when the overhead will be used for the queueMaxSDU calculation that is passed to an offloading driver. However, rcu_assign_pointer(sch->stab, stab) is called right after ops->init(), making it unavailable, and I don't really see a good reason for that. Move it earlier, which nicely seems to simplify the error handling path as well. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> --- v1->v2: none net/sched/sch_api.c | 29 +++++++++++------------------ 1 file changed, 11 insertions(+), 18 deletions(-) diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index c14018a8052c..e9780631b5b5 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1282,12 +1282,6 @@ static struct Qdisc *qdisc_create(struct net_device *dev, if (err) goto err_out3; - if (ops->init) { - err = ops->init(sch, tca[TCA_OPTIONS], extack); - if (err != 0) - goto err_out5; - } - if (tca[TCA_STAB]) { stab = qdisc_get_stab(tca[TCA_STAB], extack); if (IS_ERR(stab)) { @@ -1296,11 +1290,18 @@ static struct Qdisc *qdisc_create(struct net_device *dev, } rcu_assign_pointer(sch->stab, stab); } + + if (ops->init) { + err = ops->init(sch, tca[TCA_OPTIONS], extack); + if (err != 0) + goto err_out5; + } + if (tca[TCA_RATE]) { err = -EOPNOTSUPP; if (sch->flags & TCQ_F_MQROOT) { NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc"); - goto err_out4; + goto err_out5; } err = gen_new_estimator(&sch->bstats, @@ -1311,7 +1312,7 @@ static struct Qdisc *qdisc_create(struct net_device *dev, tca[TCA_RATE]); if (err) { NL_SET_ERR_MSG(extack, "Failed to generate new estimator"); - goto err_out4; + goto err_out5; } } @@ -1321,6 +1322,8 @@ static struct Qdisc *qdisc_create(struct net_device *dev, return sch; err_out5: + qdisc_put_stab(rtnl_dereference(sch->stab)); +err_out4: /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ if (ops->destroy) ops->destroy(sch); @@ -1332,16 +1335,6 @@ static struct Qdisc *qdisc_create(struct net_device *dev, err_out: *errp = err; return NULL; - -err_out4: - /* - * Any broken qdiscs that would require a ops->reset() here? - * The qdisc was never in action so it shouldn't be necessary. - */ - qdisc_put_stab(rtnl_dereference(sch->stab)); - if (ops->destroy) - ops->destroy(sch); - goto err_out3; } static int qdisc_change(struct Qdisc *sch, struct nlattr **tca, -- 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 10/15] net/sched: make stab available before ops->init() call Date: Tue, 7 Feb 2023 15:54:35 +0200 [thread overview] Message-ID: <20230207135440.1482856-11-vladimir.oltean@nxp.com> (raw) In-Reply-To: <20230207135440.1482856-1-vladimir.oltean@nxp.com> Some qdiscs like taprio turn out to be actually pretty reliant on a well configured stab, to not underestimate the skb transmission time (by properly accounting for L1 overhead). In a future change, taprio will need the stab, if configured by the user, to be available at ops->init() time. It will become even more important in upcoming work, when the overhead will be used for the queueMaxSDU calculation that is passed to an offloading driver. However, rcu_assign_pointer(sch->stab, stab) is called right after ops->init(), making it unavailable, and I don't really see a good reason for that. Move it earlier, which nicely seems to simplify the error handling path as well. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> --- v1->v2: none net/sched/sch_api.c | 29 +++++++++++------------------ 1 file changed, 11 insertions(+), 18 deletions(-) diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index c14018a8052c..e9780631b5b5 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1282,12 +1282,6 @@ static struct Qdisc *qdisc_create(struct net_device *dev, if (err) goto err_out3; - if (ops->init) { - err = ops->init(sch, tca[TCA_OPTIONS], extack); - if (err != 0) - goto err_out5; - } - if (tca[TCA_STAB]) { stab = qdisc_get_stab(tca[TCA_STAB], extack); if (IS_ERR(stab)) { @@ -1296,11 +1290,18 @@ static struct Qdisc *qdisc_create(struct net_device *dev, } rcu_assign_pointer(sch->stab, stab); } + + if (ops->init) { + err = ops->init(sch, tca[TCA_OPTIONS], extack); + if (err != 0) + goto err_out5; + } + if (tca[TCA_RATE]) { err = -EOPNOTSUPP; if (sch->flags & TCQ_F_MQROOT) { NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc"); - goto err_out4; + goto err_out5; } err = gen_new_estimator(&sch->bstats, @@ -1311,7 +1312,7 @@ static struct Qdisc *qdisc_create(struct net_device *dev, tca[TCA_RATE]); if (err) { NL_SET_ERR_MSG(extack, "Failed to generate new estimator"); - goto err_out4; + goto err_out5; } } @@ -1321,6 +1322,8 @@ static struct Qdisc *qdisc_create(struct net_device *dev, return sch; err_out5: + qdisc_put_stab(rtnl_dereference(sch->stab)); +err_out4: /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ if (ops->destroy) ops->destroy(sch); @@ -1332,16 +1335,6 @@ static struct Qdisc *qdisc_create(struct net_device *dev, err_out: *errp = err; return NULL; - -err_out4: - /* - * Any broken qdiscs that would require a ops->reset() here? - * The qdisc was never in action so it shouldn't be necessary. - */ - qdisc_put_stab(rtnl_dereference(sch->stab)); - if (ops->destroy) - ops->destroy(sch); - goto err_out3; } static int qdisc_change(struct Qdisc *sch, struct nlattr **tca, -- 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 13:56 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 ` [PATCH v2 net-next 01/15] net/sched: taprio: delete peek() implementation Vladimir Oltean 2023-02-07 13:54 ` [Intel-wired-lan] " 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 ` Vladimir Oltean [this message] 2023-02-07 13:54 ` [Intel-wired-lan] [PATCH v2 net-next 10/15] net/sched: make stab available before ops->init() call 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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