From: Felix Fietkau Date: Mon, 13 Dec 2021 17:15:07 +0000 (+0100) Subject: kernel: backport the upstream implementation of threaded NAPI to 5.4 X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=01bebc070c35d87c24a594fff7ee1911965759aa;p=openwrt%2Fstaging%2Fmans0n.git kernel: backport the upstream implementation of threaded NAPI to 5.4 The workqueue based implementation has a few corner cases and typically lower performance than the upstream one Signed-off-by: Felix Fietkau --- diff --git a/target/linux/generic/backport-5.4/600-v5.12-net-extract-napi-poll-functionality-to-__napi_poll.patch b/target/linux/generic/backport-5.4/600-v5.12-net-extract-napi-poll-functionality-to-__napi_poll.patch new file mode 100644 index 0000000000..961140aabb --- /dev/null +++ b/target/linux/generic/backport-5.4/600-v5.12-net-extract-napi-poll-functionality-to-__napi_poll.patch @@ -0,0 +1,88 @@ +From: Felix Fietkau +Date: Mon, 8 Feb 2021 11:34:08 -0800 +Subject: [PATCH] net: extract napi poll functionality to __napi_poll() + +This commit introduces a new function __napi_poll() which does the main +logic of the existing napi_poll() function, and will be called by other +functions in later commits. +This idea and implementation is done by Felix Fietkau and +is proposed as part of the patch to move napi work to work_queue +context. +This commit by itself is a code restructure. + +Signed-off-by: Felix Fietkau +Signed-off-by: Wei Wang +Reviewed-by: Alexander Duyck +Signed-off-by: David S. Miller +--- + +--- a/net/core/dev.c ++++ b/net/core/dev.c +@@ -6322,15 +6322,10 @@ void netif_napi_del(struct napi_struct * + } + EXPORT_SYMBOL(netif_napi_del); + +-static int napi_poll(struct napi_struct *n, struct list_head *repoll) ++static int __napi_poll(struct napi_struct *n, bool *repoll) + { +- void *have; + int work, weight; + +- list_del_init(&n->poll_list); +- +- have = netpoll_poll_lock(n); +- + weight = n->weight; + + /* This NAPI_STATE_SCHED test is for avoiding a race +@@ -6348,7 +6343,7 @@ static int napi_poll(struct napi_struct + WARN_ON_ONCE(work > weight); + + if (likely(work < weight)) +- goto out_unlock; ++ return work; + + /* Drivers must not modify the NAPI state if they + * consume the entire weight. In such cases this code +@@ -6357,7 +6352,7 @@ static int napi_poll(struct napi_struct + */ + if (unlikely(napi_disable_pending(n))) { + napi_complete(n); +- goto out_unlock; ++ return work; + } + + if (n->gro_bitmask) { +@@ -6375,12 +6370,29 @@ static int napi_poll(struct napi_struct + if (unlikely(!list_empty(&n->poll_list))) { + pr_warn_once("%s: Budget exhausted after napi rescheduled\n", + n->dev ? n->dev->name : "backlog"); +- goto out_unlock; ++ return work; + } + +- list_add_tail(&n->poll_list, repoll); ++ *repoll = true; ++ ++ return work; ++} ++ ++static int napi_poll(struct napi_struct *n, struct list_head *repoll) ++{ ++ bool do_repoll = false; ++ void *have; ++ int work; ++ ++ list_del_init(&n->poll_list); ++ ++ have = netpoll_poll_lock(n); ++ ++ work = __napi_poll(n, &do_repoll); ++ ++ if (do_repoll) ++ list_add_tail(&n->poll_list, repoll); + +-out_unlock: + netpoll_poll_unlock(have); + + return work; diff --git a/target/linux/generic/backport-5.4/601-v5.12-net-implement-threaded-able-napi-poll-loop-support.patch b/target/linux/generic/backport-5.4/601-v5.12-net-implement-threaded-able-napi-poll-loop-support.patch new file mode 100644 index 0000000000..c9bd4abb53 --- /dev/null +++ b/target/linux/generic/backport-5.4/601-v5.12-net-implement-threaded-able-napi-poll-loop-support.patch @@ -0,0 +1,261 @@ +From: Wei Wang +Date: Mon, 8 Feb 2021 11:34:09 -0800 +Subject: [PATCH] net: implement threaded-able napi poll loop support + +This patch allows running each napi poll loop inside its own +kernel thread. +The kthread is created during netif_napi_add() if dev->threaded +is set. And threaded mode is enabled in napi_enable(). We will +provide a way to set dev->threaded and enable threaded mode +without a device up/down in the following patch. + +Once that threaded mode is enabled and the kthread is +started, napi_schedule() will wake-up such thread instead +of scheduling the softirq. + +The threaded poll loop behaves quite likely the net_rx_action, +but it does not have to manipulate local irqs and uses +an explicit scheduling point based on netdev_budget. + +Co-developed-by: Paolo Abeni +Signed-off-by: Paolo Abeni +Co-developed-by: Hannes Frederic Sowa +Signed-off-by: Hannes Frederic Sowa +Co-developed-by: Jakub Kicinski +Signed-off-by: Jakub Kicinski +Signed-off-by: Wei Wang +Reviewed-by: Alexander Duyck +Signed-off-by: David S. Miller +--- + +--- a/include/linux/netdevice.h ++++ b/include/linux/netdevice.h +@@ -340,6 +340,7 @@ struct napi_struct { + struct list_head dev_list; + struct hlist_node napi_hash_node; + unsigned int napi_id; ++ struct task_struct *thread; + }; + + enum { +@@ -350,6 +351,7 @@ enum { + NAPI_STATE_HASHED, /* In NAPI hash (busy polling possible) */ + NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */ + NAPI_STATE_IN_BUSY_POLL,/* sk_busy_loop() owns this NAPI */ ++ NAPI_STATE_THREADED, /* The poll is performed inside its own thread*/ + }; + + enum { +@@ -360,6 +362,7 @@ enum { + NAPIF_STATE_HASHED = BIT(NAPI_STATE_HASHED), + NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL), + NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL), ++ NAPIF_STATE_THREADED = BIT(NAPI_STATE_THREADED), + }; + + enum gro_result { +@@ -504,20 +507,7 @@ bool napi_hash_del(struct napi_struct *n + */ + void napi_disable(struct napi_struct *n); + +-/** +- * napi_enable - enable NAPI scheduling +- * @n: NAPI context +- * +- * Resume NAPI from being scheduled on this context. +- * Must be paired with napi_disable. +- */ +-static inline void napi_enable(struct napi_struct *n) +-{ +- BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); +- smp_mb__before_atomic(); +- clear_bit(NAPI_STATE_SCHED, &n->state); +- clear_bit(NAPI_STATE_NPSVC, &n->state); +-} ++void napi_enable(struct napi_struct *n); + + /** + * napi_synchronize - wait until NAPI is not running +@@ -1783,6 +1773,8 @@ enum netdev_ml_priv_type { + * + * @wol_enabled: Wake-on-LAN is enabled + * ++ * @threaded: napi threaded mode is enabled ++ * + * FIXME: cleanup struct net_device such that network protocol info + * moves out. + */ +@@ -2075,6 +2067,7 @@ struct net_device { + struct lock_class_key addr_list_lock_key; + bool proto_down; + unsigned wol_enabled:1; ++ unsigned threaded:1; + }; + #define to_net_dev(d) container_of(d, struct net_device, dev) + +--- a/net/core/dev.c ++++ b/net/core/dev.c +@@ -91,6 +91,7 @@ + #include + #include + #include ++#include + #include + #include + #include +@@ -1289,6 +1290,27 @@ void netdev_notify_peers(struct net_devi + } + EXPORT_SYMBOL(netdev_notify_peers); + ++static int napi_threaded_poll(void *data); ++ ++static int napi_kthread_create(struct napi_struct *n) ++{ ++ int err = 0; ++ ++ /* Create and wake up the kthread once to put it in ++ * TASK_INTERRUPTIBLE mode to avoid the blocked task ++ * warning and work with loadavg. ++ */ ++ n->thread = kthread_run(napi_threaded_poll, n, "napi/%s-%d", ++ n->dev->name, n->napi_id); ++ if (IS_ERR(n->thread)) { ++ err = PTR_ERR(n->thread); ++ pr_err("kthread_run failed with err %d\n", err); ++ n->thread = NULL; ++ } ++ ++ return err; ++} ++ + static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack) + { + const struct net_device_ops *ops = dev->netdev_ops; +@@ -3885,6 +3907,21 @@ int gro_normal_batch __read_mostly = 8; + static inline void ____napi_schedule(struct softnet_data *sd, + struct napi_struct *napi) + { ++ struct task_struct *thread; ++ ++ if (test_bit(NAPI_STATE_THREADED, &napi->state)) { ++ /* Paired with smp_mb__before_atomic() in ++ * napi_enable(). Use READ_ONCE() to guarantee ++ * a complete read on napi->thread. Only call ++ * wake_up_process() when it's not NULL. ++ */ ++ thread = READ_ONCE(napi->thread); ++ if (thread) { ++ wake_up_process(thread); ++ return; ++ } ++ } ++ + list_add_tail(&napi->poll_list, &sd->poll_list); + __raise_softirq_irqoff(NET_RX_SOFTIRQ); + } +@@ -6276,6 +6313,12 @@ void netif_napi_add(struct net_device *d + set_bit(NAPI_STATE_NPSVC, &napi->state); + list_add_rcu(&napi->dev_list, &dev->napi_list); + napi_hash_add(napi); ++ /* Create kthread for this napi if dev->threaded is set. ++ * Clear dev->threaded if kthread creation failed so that ++ * threaded mode will not be enabled in napi_enable(). ++ */ ++ if (dev->threaded && napi_kthread_create(napi)) ++ dev->threaded = 0; + } + EXPORT_SYMBOL(netif_napi_add); + +@@ -6292,9 +6335,28 @@ void napi_disable(struct napi_struct *n) + hrtimer_cancel(&n->timer); + + clear_bit(NAPI_STATE_DISABLE, &n->state); ++ clear_bit(NAPI_STATE_THREADED, &n->state); + } + EXPORT_SYMBOL(napi_disable); + ++/** ++ * napi_enable - enable NAPI scheduling ++ * @n: NAPI context ++ * ++ * Resume NAPI from being scheduled on this context. ++ * Must be paired with napi_disable. ++ */ ++void napi_enable(struct napi_struct *n) ++{ ++ BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); ++ smp_mb__before_atomic(); ++ clear_bit(NAPI_STATE_SCHED, &n->state); ++ clear_bit(NAPI_STATE_NPSVC, &n->state); ++ if (n->dev->threaded && n->thread) ++ set_bit(NAPI_STATE_THREADED, &n->state); ++} ++EXPORT_SYMBOL(napi_enable); ++ + static void flush_gro_hash(struct napi_struct *napi) + { + int i; +@@ -6319,6 +6381,11 @@ void netif_napi_del(struct napi_struct * + + flush_gro_hash(napi); + napi->gro_bitmask = 0; ++ ++ if (napi->thread) { ++ kthread_stop(napi->thread); ++ napi->thread = NULL; ++ } + } + EXPORT_SYMBOL(netif_napi_del); + +@@ -6398,6 +6465,51 @@ static int napi_poll(struct napi_struct + return work; + } + ++static int napi_thread_wait(struct napi_struct *napi) ++{ ++ set_current_state(TASK_INTERRUPTIBLE); ++ ++ while (!kthread_should_stop() && !napi_disable_pending(napi)) { ++ if (test_bit(NAPI_STATE_SCHED, &napi->state)) { ++ WARN_ON(!list_empty(&napi->poll_list)); ++ __set_current_state(TASK_RUNNING); ++ return 0; ++ } ++ ++ schedule(); ++ set_current_state(TASK_INTERRUPTIBLE); ++ } ++ __set_current_state(TASK_RUNNING); ++ return -1; ++} ++ ++static int napi_threaded_poll(void *data) ++{ ++ struct napi_struct *napi = data; ++ void *have; ++ ++ while (!napi_thread_wait(napi)) { ++ for (;;) { ++ bool repoll = false; ++ ++ local_bh_disable(); ++ ++ have = netpoll_poll_lock(napi); ++ __napi_poll(napi, &repoll); ++ netpoll_poll_unlock(have); ++ ++ __kfree_skb_flush(); ++ local_bh_enable(); ++ ++ if (!repoll) ++ break; ++ ++ cond_resched(); ++ } ++ } ++ return 0; ++} ++ + static __latent_entropy void net_rx_action(struct softirq_action *h) + { + struct softnet_data *sd = this_cpu_ptr(&softnet_data); diff --git a/target/linux/generic/backport-5.4/602-v5.12-net-add-sysfs-attribute-to-control-napi-threaded-mod.patch b/target/linux/generic/backport-5.4/602-v5.12-net-add-sysfs-attribute-to-control-napi-threaded-mod.patch new file mode 100644 index 0000000000..d8b932978c --- /dev/null +++ b/target/linux/generic/backport-5.4/602-v5.12-net-add-sysfs-attribute-to-control-napi-threaded-mod.patch @@ -0,0 +1,177 @@ +From: Wei Wang +Date: Mon, 8 Feb 2021 11:34:10 -0800 +Subject: [PATCH] net: add sysfs attribute to control napi threaded mode + +This patch adds a new sysfs attribute to the network device class. +Said attribute provides a per-device control to enable/disable the +threaded mode for all the napi instances of the given network device, +without the need for a device up/down. +User sets it to 1 or 0 to enable or disable threaded mode. +Note: when switching between threaded and the current softirq based mode +for a napi instance, it will not immediately take effect if the napi is +currently being polled. The mode switch will happen for the next time +napi_schedule() is called. + +Co-developed-by: Paolo Abeni +Signed-off-by: Paolo Abeni +Co-developed-by: Hannes Frederic Sowa +Signed-off-by: Hannes Frederic Sowa +Co-developed-by: Felix Fietkau +Signed-off-by: Felix Fietkau +Signed-off-by: Wei Wang +Reviewed-by: Alexander Duyck +Signed-off-by: David S. Miller +--- + +--- a/Documentation/ABI/testing/sysfs-class-net ++++ b/Documentation/ABI/testing/sysfs-class-net +@@ -301,3 +301,18 @@ Contact: netdev@vger.kernel.org + Description: + 32-bit unsigned integer counting the number of times the link has + been down ++ ++What: /sys/class/net//threaded ++Date: Jan 2021 ++KernelVersion: 5.12 ++Contact: netdev@vger.kernel.org ++Description: ++ Boolean value to control the threaded mode per device. User could ++ set this value to enable/disable threaded mode for all napi ++ belonging to this device, without the need to do device up/down. ++ ++ Possible values: ++ == ================================== ++ 0 threaded mode disabled for this dev ++ 1 threaded mode enabled for this dev ++ == ================================== +--- a/include/linux/netdevice.h ++++ b/include/linux/netdevice.h +@@ -498,6 +498,8 @@ static inline bool napi_complete(struct + */ + bool napi_hash_del(struct napi_struct *napi); + ++int dev_set_threaded(struct net_device *dev, bool threaded); ++ + /** + * napi_disable - prevent NAPI from scheduling + * @n: NAPI context +--- a/net/core/dev.c ++++ b/net/core/dev.c +@@ -3911,8 +3911,9 @@ static inline void ____napi_schedule(str + + if (test_bit(NAPI_STATE_THREADED, &napi->state)) { + /* Paired with smp_mb__before_atomic() in +- * napi_enable(). Use READ_ONCE() to guarantee +- * a complete read on napi->thread. Only call ++ * napi_enable()/dev_set_threaded(). ++ * Use READ_ONCE() to guarantee a complete ++ * read on napi->thread. Only call + * wake_up_process() when it's not NULL. + */ + thread = READ_ONCE(napi->thread); +@@ -6290,6 +6291,49 @@ static void init_gro_hash(struct napi_st + napi->gro_bitmask = 0; + } + ++int dev_set_threaded(struct net_device *dev, bool threaded) ++{ ++ struct napi_struct *napi; ++ int err = 0; ++ ++ if (dev->threaded == threaded) ++ return 0; ++ ++ if (threaded) { ++ list_for_each_entry(napi, &dev->napi_list, dev_list) { ++ if (!napi->thread) { ++ err = napi_kthread_create(napi); ++ if (err) { ++ threaded = false; ++ break; ++ } ++ } ++ } ++ } ++ ++ dev->threaded = threaded; ++ ++ /* Make sure kthread is created before THREADED bit ++ * is set. ++ */ ++ smp_mb__before_atomic(); ++ ++ /* Setting/unsetting threaded mode on a napi might not immediately ++ * take effect, if the current napi instance is actively being ++ * polled. In this case, the switch between threaded mode and ++ * softirq mode will happen in the next round of napi_schedule(). ++ * This should not cause hiccups/stalls to the live traffic. ++ */ ++ list_for_each_entry(napi, &dev->napi_list, dev_list) { ++ if (threaded) ++ set_bit(NAPI_STATE_THREADED, &napi->state); ++ else ++ clear_bit(NAPI_STATE_THREADED, &napi->state); ++ } ++ ++ return err; ++} ++ + void netif_napi_add(struct net_device *dev, struct napi_struct *napi, + int (*poll)(struct napi_struct *, int), int weight) + { +--- a/net/core/net-sysfs.c ++++ b/net/core/net-sysfs.c +@@ -557,6 +557,45 @@ static ssize_t phys_switch_id_show(struc + } + static DEVICE_ATTR_RO(phys_switch_id); + ++static ssize_t threaded_show(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ struct net_device *netdev = to_net_dev(dev); ++ ssize_t ret = -EINVAL; ++ ++ if (!rtnl_trylock()) ++ return restart_syscall(); ++ ++ if (dev_isalive(netdev)) ++ ret = sprintf(buf, fmt_dec, netdev->threaded); ++ ++ rtnl_unlock(); ++ return ret; ++} ++ ++static int modify_napi_threaded(struct net_device *dev, unsigned long val) ++{ ++ int ret; ++ ++ if (list_empty(&dev->napi_list)) ++ return -EOPNOTSUPP; ++ ++ if (val != 0 && val != 1) ++ return -EOPNOTSUPP; ++ ++ ret = dev_set_threaded(dev, val); ++ ++ return ret; ++} ++ ++static ssize_t threaded_store(struct device *dev, ++ struct device_attribute *attr, ++ const char *buf, size_t len) ++{ ++ return netdev_store(dev, attr, buf, len, modify_napi_threaded); ++} ++static DEVICE_ATTR_RW(threaded); ++ + static struct attribute *net_class_attrs[] __ro_after_init = { + &dev_attr_netdev_group.attr, + &dev_attr_type.attr, +@@ -587,6 +626,7 @@ static struct attribute *net_class_attrs + &dev_attr_proto_down.attr, + &dev_attr_carrier_up_count.attr, + &dev_attr_carrier_down_count.attr, ++ &dev_attr_threaded.attr, + NULL, + }; + ATTRIBUTE_GROUPS(net_class); diff --git a/target/linux/generic/backport-5.4/603-v5.12-net-fix-race-between-napi-kthread-mode-and-busy-poll.patch b/target/linux/generic/backport-5.4/603-v5.12-net-fix-race-between-napi-kthread-mode-and-busy-poll.patch new file mode 100644 index 0000000000..19c5a53a27 --- /dev/null +++ b/target/linux/generic/backport-5.4/603-v5.12-net-fix-race-between-napi-kthread-mode-and-busy-poll.patch @@ -0,0 +1,93 @@ +From: Wei Wang +Date: Mon, 1 Mar 2021 17:21:13 -0800 +Subject: [PATCH] net: fix race between napi kthread mode and busy poll + +Currently, napi_thread_wait() checks for NAPI_STATE_SCHED bit to +determine if the kthread owns this napi and could call napi->poll() on +it. However, if socket busy poll is enabled, it is possible that the +busy poll thread grabs this SCHED bit (after the previous napi->poll() +invokes napi_complete_done() and clears SCHED bit) and tries to poll +on the same napi. napi_disable() could grab the SCHED bit as well. +This patch tries to fix this race by adding a new bit +NAPI_STATE_SCHED_THREADED in napi->state. This bit gets set in +____napi_schedule() if the threaded mode is enabled, and gets cleared +in napi_complete_done(), and we only poll the napi in kthread if this +bit is set. This helps distinguish the ownership of the napi between +kthread and other scenarios and fixes the race issue. + +Fixes: 29863d41bb6e ("net: implement threaded-able napi poll loop support") +Reported-by: Martin Zaharinov +Suggested-by: Jakub Kicinski +Signed-off-by: Wei Wang +Cc: Alexander Duyck +Cc: Eric Dumazet +Cc: Paolo Abeni +Cc: Hannes Frederic Sowa +--- + +--- a/include/linux/netdevice.h ++++ b/include/linux/netdevice.h +@@ -352,6 +352,7 @@ enum { + NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */ + NAPI_STATE_IN_BUSY_POLL,/* sk_busy_loop() owns this NAPI */ + NAPI_STATE_THREADED, /* The poll is performed inside its own thread*/ ++ NAPI_STATE_SCHED_THREADED, /* Napi is currently scheduled in threaded mode */ + }; + + enum { +@@ -363,6 +364,7 @@ enum { + NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL), + NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL), + NAPIF_STATE_THREADED = BIT(NAPI_STATE_THREADED), ++ NAPIF_STATE_SCHED_THREADED = BIT(NAPI_STATE_SCHED_THREADED), + }; + + enum gro_result { +--- a/net/core/dev.c ++++ b/net/core/dev.c +@@ -3918,6 +3918,8 @@ static inline void ____napi_schedule(str + */ + thread = READ_ONCE(napi->thread); + if (thread) { ++ if (thread->state != TASK_INTERRUPTIBLE) ++ set_bit(NAPI_STATE_SCHED_THREADED, &napi->state); + wake_up_process(thread); + return; + } +@@ -6078,7 +6080,8 @@ bool napi_complete_done(struct napi_stru + + WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED)); + +- new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED); ++ new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED | ++ NAPIF_STATE_SCHED_THREADED); + + /* If STATE_MISSED was set, leave STATE_SCHED set, + * because we will call napi->poll() one more time. +@@ -6511,16 +6514,25 @@ static int napi_poll(struct napi_struct + + static int napi_thread_wait(struct napi_struct *napi) + { ++ bool woken = false; ++ + set_current_state(TASK_INTERRUPTIBLE); + + while (!kthread_should_stop() && !napi_disable_pending(napi)) { +- if (test_bit(NAPI_STATE_SCHED, &napi->state)) { ++ /* Testing SCHED_THREADED bit here to make sure the current ++ * kthread owns this napi and could poll on this napi. ++ * Testing SCHED bit is not enough because SCHED bit might be ++ * set by some other busy poll thread or by napi_disable(). ++ */ ++ if (test_bit(NAPI_STATE_SCHED_THREADED, &napi->state) || woken) { + WARN_ON(!list_empty(&napi->poll_list)); + __set_current_state(TASK_RUNNING); + return 0; + } + + schedule(); ++ /* woken being true indicates this thread owns this napi. */ ++ woken = true; + set_current_state(TASK_INTERRUPTIBLE); + } + __set_current_state(TASK_RUNNING); diff --git a/target/linux/generic/backport-5.4/604-v5.12-net-fix-hangup-on-napi_disable-for-threaded-napi.patch b/target/linux/generic/backport-5.4/604-v5.12-net-fix-hangup-on-napi_disable-for-threaded-napi.patch new file mode 100644 index 0000000000..108cf809f8 --- /dev/null +++ b/target/linux/generic/backport-5.4/604-v5.12-net-fix-hangup-on-napi_disable-for-threaded-napi.patch @@ -0,0 +1,53 @@ +From: Paolo Abeni +Date: Fri, 9 Apr 2021 17:24:17 +0200 +Subject: [PATCH] net: fix hangup on napi_disable for threaded napi + +napi_disable() is subject to an hangup, when the threaded +mode is enabled and the napi is under heavy traffic. + +If the relevant napi has been scheduled and the napi_disable() +kicks in before the next napi_threaded_wait() completes - so +that the latter quits due to the napi_disable_pending() condition, +the existing code leaves the NAPI_STATE_SCHED bit set and the +napi_disable() loop waiting for such bit will hang. + +This patch addresses the issue by dropping the NAPI_STATE_DISABLE +bit test in napi_thread_wait(). The later napi_threaded_poll() +iteration will take care of clearing the NAPI_STATE_SCHED. + +This also addresses a related problem reported by Jakub: +before this patch a napi_disable()/napi_enable() pair killed +the napi thread, effectively disabling the threaded mode. +On the patched kernel napi_disable() simply stops scheduling +the relevant thread. + +v1 -> v2: + - let the main napi_thread_poll() loop clear the SCHED bit + +Reported-by: Jakub Kicinski +Fixes: 29863d41bb6e ("net: implement threaded-able napi poll loop support") +Signed-off-by: Paolo Abeni +Reviewed-by: Eric Dumazet +Link: https://lore.kernel.org/r/883923fa22745a9589e8610962b7dc59df09fb1f.1617981844.git.pabeni@redhat.com +Signed-off-by: Jakub Kicinski +--- + +--- a/net/core/dev.c ++++ b/net/core/dev.c +@@ -6518,7 +6518,7 @@ static int napi_thread_wait(struct napi_ + + set_current_state(TASK_INTERRUPTIBLE); + +- while (!kthread_should_stop() && !napi_disable_pending(napi)) { ++ while (!kthread_should_stop()) { + /* Testing SCHED_THREADED bit here to make sure the current + * kthread owns this napi and could poll on this napi. + * Testing SCHED bit is not enough because SCHED bit might be +@@ -6536,6 +6536,7 @@ static int napi_thread_wait(struct napi_ + set_current_state(TASK_INTERRUPTIBLE); + } + __set_current_state(TASK_RUNNING); ++ + return -1; + } + diff --git a/target/linux/generic/backport-5.4/700-v5.5-net-core-allow-fast-GRO-for-skbs-with-Ethernet-heade.patch b/target/linux/generic/backport-5.4/700-v5.5-net-core-allow-fast-GRO-for-skbs-with-Ethernet-heade.patch index a8181bca94..34ad5a1f4e 100644 --- a/target/linux/generic/backport-5.4/700-v5.5-net-core-allow-fast-GRO-for-skbs-with-Ethernet-heade.patch +++ b/target/linux/generic/backport-5.4/700-v5.5-net-core-allow-fast-GRO-for-skbs-with-Ethernet-heade.patch @@ -66,7 +66,7 @@ Signed-off-by: David S. Miller --- a/net/core/dev.c +++ b/net/core/dev.c -@@ -5432,8 +5432,7 @@ static inline void skb_gro_reset_offset( +@@ -5472,8 +5472,7 @@ static inline void skb_gro_reset_offset( NAPI_GRO_CB(skb)->frag0 = NULL; NAPI_GRO_CB(skb)->frag0_len = 0; diff --git a/target/linux/generic/hack-5.4/721-phy_packets.patch b/target/linux/generic/hack-5.4/721-phy_packets.patch index 268e9df051..89ff8ea41a 100644 --- a/target/linux/generic/hack-5.4/721-phy_packets.patch +++ b/target/linux/generic/hack-5.4/721-phy_packets.patch @@ -15,7 +15,7 @@ Signed-off-by: Felix Fietkau --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h -@@ -1549,6 +1549,7 @@ enum netdev_priv_flags { +@@ -1540,6 +1540,7 @@ enum netdev_priv_flags { IFF_FAILOVER_SLAVE = 1<<28, IFF_L3MDEV_RX_HANDLER = 1<<29, IFF_LIVE_RENAME_OK = 1<<30, @@ -23,7 +23,7 @@ Signed-off-by: Felix Fietkau }; #define IFF_802_1Q_VLAN IFF_802_1Q_VLAN -@@ -1581,6 +1582,7 @@ enum netdev_priv_flags { +@@ -1572,6 +1573,7 @@ enum netdev_priv_flags { #define IFF_FAILOVER_SLAVE IFF_FAILOVER_SLAVE #define IFF_L3MDEV_RX_HANDLER IFF_L3MDEV_RX_HANDLER #define IFF_LIVE_RENAME_OK IFF_LIVE_RENAME_OK @@ -31,7 +31,7 @@ Signed-off-by: Felix Fietkau /* Specifies the type of the struct net_device::ml_priv pointer */ enum netdev_ml_priv_type { -@@ -1889,6 +1891,11 @@ struct net_device { +@@ -1882,6 +1884,11 @@ struct net_device { const struct tlsdev_ops *tlsdev_ops; #endif @@ -43,7 +43,7 @@ Signed-off-by: Felix Fietkau const struct header_ops *header_ops; unsigned int flags; -@@ -1971,6 +1978,10 @@ struct net_device { +@@ -1964,6 +1971,10 @@ struct net_device { struct mpls_dev __rcu *mpls_ptr; #endif @@ -101,7 +101,7 @@ Signed-off-by: Felix Fietkau help --- a/net/core/dev.c +++ b/net/core/dev.c -@@ -3200,10 +3200,20 @@ static int xmit_one(struct sk_buff *skb, +@@ -3221,10 +3221,20 @@ static int xmit_one(struct sk_buff *skb, if (dev_nit_active(dev)) dev_queue_xmit_nit(skb, dev); diff --git a/target/linux/generic/pending-5.4/640-netfilter-nf_flow_table-add-hardware-offload-support.patch b/target/linux/generic/pending-5.4/640-netfilter-nf_flow_table-add-hardware-offload-support.patch index 02600ebed0..f5d9dcde99 100644 --- a/target/linux/generic/pending-5.4/640-netfilter-nf_flow_table-add-hardware-offload-support.patch +++ b/target/linux/generic/pending-5.4/640-netfilter-nf_flow_table-add-hardware-offload-support.patch @@ -23,7 +23,7 @@ Signed-off-by: Pablo Neira Ayuso --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h -@@ -928,6 +928,13 @@ struct devlink; +@@ -922,6 +922,13 @@ struct devlink; struct tlsdev_ops; @@ -37,7 +37,7 @@ Signed-off-by: Pablo Neira Ayuso /* * This structure defines the management hooks for network devices. * The following hooks can be defined; unless noted otherwise, they are -@@ -1160,6 +1167,10 @@ struct tlsdev_ops; +@@ -1154,6 +1161,10 @@ struct tlsdev_ops; * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh, * u16 flags); * @@ -48,7 +48,7 @@ Signed-off-by: Pablo Neira Ayuso * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier); * Called to change device carrier. Soft-devices (like dummy, team, etc) * which do not represent real hardware may define this to allow their -@@ -1407,6 +1418,8 @@ struct net_device_ops { +@@ -1401,6 +1412,8 @@ struct net_device_ops { int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh, u16 flags); diff --git a/target/linux/generic/pending-5.4/641-netfilter-nf_flow_table-support-hw-offload-through-v.patch b/target/linux/generic/pending-5.4/641-netfilter-nf_flow_table-support-hw-offload-through-v.patch index 9f113c7108..b808c0257d 100644 --- a/target/linux/generic/pending-5.4/641-netfilter-nf_flow_table-support-hw-offload-through-v.patch +++ b/target/linux/generic/pending-5.4/641-netfilter-nf_flow_table-support-hw-offload-through-v.patch @@ -15,7 +15,7 @@ Signed-off-by: Felix Fietkau --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h -@@ -929,6 +929,7 @@ struct tlsdev_ops; +@@ -923,6 +923,7 @@ struct tlsdev_ops; struct flow_offload; @@ -23,7 +23,7 @@ Signed-off-by: Felix Fietkau enum flow_offload_type { FLOW_OFFLOAD_ADD = 0, -@@ -1167,8 +1168,15 @@ enum flow_offload_type { +@@ -1161,8 +1162,15 @@ enum flow_offload_type { * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh, * u16 flags); * @@ -40,7 +40,7 @@ Signed-off-by: Felix Fietkau * Adds/deletes flow entry to/from net device flowtable. * * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier); -@@ -1418,8 +1426,11 @@ struct net_device_ops { +@@ -1412,8 +1420,11 @@ struct net_device_ops { int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh, u16 flags); diff --git a/target/linux/generic/pending-5.4/680-NET-skip-GRO-for-foreign-MAC-addresses.patch b/target/linux/generic/pending-5.4/680-NET-skip-GRO-for-foreign-MAC-addresses.patch index b1ac7ffca0..45f643b650 100644 --- a/target/linux/generic/pending-5.4/680-NET-skip-GRO-for-foreign-MAC-addresses.patch +++ b/target/linux/generic/pending-5.4/680-NET-skip-GRO-for-foreign-MAC-addresses.patch @@ -11,7 +11,7 @@ Signed-off-by: Felix Fietkau --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h -@@ -1931,6 +1931,8 @@ struct net_device { +@@ -1927,6 +1927,8 @@ struct net_device { struct netdev_hw_addr_list mc; struct netdev_hw_addr_list dev_addrs; @@ -32,7 +32,7 @@ Signed-off-by: Felix Fietkau __u16 tc_index; /* traffic control index */ --- a/net/core/dev.c +++ b/net/core/dev.c -@@ -5498,6 +5498,9 @@ static enum gro_result dev_gro_receive(s +@@ -5538,6 +5538,9 @@ static enum gro_result dev_gro_receive(s int same_flow; int grow; @@ -42,7 +42,7 @@ Signed-off-by: Felix Fietkau if (netif_elide_gro(skb->dev)) goto normal; -@@ -7300,6 +7303,48 @@ static void __netdev_adjacent_dev_unlink +@@ -7481,6 +7484,48 @@ static void __netdev_adjacent_dev_unlink &upper_dev->adj_list.lower); } @@ -91,7 +91,7 @@ Signed-off-by: Felix Fietkau static int __netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, bool master, void *upper_priv, void *upper_info, -@@ -7350,6 +7395,7 @@ static int __netdev_upper_dev_link(struc +@@ -7531,6 +7576,7 @@ static int __netdev_upper_dev_link(struc if (ret) return ret; @@ -99,7 +99,7 @@ Signed-off-by: Felix Fietkau ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, &changeupper_info.info); ret = notifier_to_errno(ret); -@@ -7443,6 +7489,7 @@ void netdev_upper_dev_unlink(struct net_ +@@ -7624,6 +7670,7 @@ void netdev_upper_dev_unlink(struct net_ __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); @@ -107,7 +107,7 @@ Signed-off-by: Felix Fietkau call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, &changeupper_info.info); -@@ -8173,6 +8220,7 @@ int dev_set_mac_address(struct net_devic +@@ -8354,6 +8401,7 @@ int dev_set_mac_address(struct net_devic if (err) return err; dev->addr_assign_type = NET_ADDR_SET; diff --git a/target/linux/generic/pending-5.4/690-net-add-support-for-threaded-NAPI-polling.patch b/target/linux/generic/pending-5.4/690-net-add-support-for-threaded-NAPI-polling.patch deleted file mode 100644 index 0e97f2140c..0000000000 --- a/target/linux/generic/pending-5.4/690-net-add-support-for-threaded-NAPI-polling.patch +++ /dev/null @@ -1,355 +0,0 @@ -From: Felix Fietkau -Date: Sun, 26 Jul 2020 14:03:21 +0200 -Subject: [PATCH] net: add support for threaded NAPI polling - -For some drivers (especially 802.11 drivers), doing a lot of work in the NAPI -poll function does not perform well. Since NAPI poll is bound to the CPU it -was scheduled from, we can easily end up with a few very busy CPUs spending -most of their time in softirq/ksoftirqd and some idle ones. - -Introduce threaded NAPI for such drivers based on a workqueue. The API is the -same except for using netif_threaded_napi_add instead of netif_napi_add. - -In my tests with mt76 on MT7621 using threaded NAPI + a thread for tx scheduling -improves LAN->WLAN bridging throughput by 10-50%. Throughput without threaded -NAPI is wildly inconsistent, depending on the CPU that runs the tx scheduling -thread. - -With threaded NAPI it seems stable and consistent (and higher than the best -results I got without it). - -Based on a patch by Hillf Danton - -Cc: Hillf Danton -Signed-off-by: Felix Fietkau ---- - ---- a/include/linux/netdevice.h -+++ b/include/linux/netdevice.h -@@ -340,6 +340,7 @@ struct napi_struct { - struct list_head dev_list; - struct hlist_node napi_hash_node; - unsigned int napi_id; -+ struct work_struct work; - }; - - enum { -@@ -350,6 +351,7 @@ enum { - NAPI_STATE_HASHED, /* In NAPI hash (busy polling possible) */ - NAPI_STATE_NO_BUSY_POLL,/* Do not add in napi_hash, no busy polling */ - NAPI_STATE_IN_BUSY_POLL,/* sk_busy_loop() owns this NAPI */ -+ NAPI_STATE_THREADED, /* Use threaded NAPI */ - }; - - enum { -@@ -360,6 +362,7 @@ enum { - NAPIF_STATE_HASHED = BIT(NAPI_STATE_HASHED), - NAPIF_STATE_NO_BUSY_POLL = BIT(NAPI_STATE_NO_BUSY_POLL), - NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL), -+ NAPIF_STATE_THREADED = BIT(NAPI_STATE_THREADED), - }; - - enum gro_result { -@@ -2101,6 +2104,7 @@ struct net_device { - struct lock_class_key addr_list_lock_key; - bool proto_down; - unsigned wol_enabled:1; -+ unsigned threaded:1; - }; - #define to_net_dev(d) container_of(d, struct net_device, dev) - -@@ -2281,6 +2285,26 @@ void netif_napi_add(struct net_device *d - int (*poll)(struct napi_struct *, int), int weight); - - /** -+ * netif_threaded_napi_add - initialize a NAPI context -+ * @dev: network device -+ * @napi: NAPI context -+ * @poll: polling function -+ * @weight: default weight -+ * -+ * This variant of netif_napi_add() should be used from drivers using NAPI -+ * with CPU intensive poll functions. -+ * This will schedule polling from a high priority workqueue -+ */ -+static inline void netif_threaded_napi_add(struct net_device *dev, -+ struct napi_struct *napi, -+ int (*poll)(struct napi_struct *, int), -+ int weight) -+{ -+ set_bit(NAPI_STATE_THREADED, &napi->state); -+ netif_napi_add(dev, napi, poll, weight); -+} -+ -+/** - * netif_tx_napi_add - initialize a NAPI context - * @dev: network device - * @napi: NAPI context ---- a/net/core/dev.c -+++ b/net/core/dev.c -@@ -156,6 +156,7 @@ static DEFINE_SPINLOCK(offload_lock); - struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; - struct list_head ptype_all __read_mostly; /* Taps */ - static struct list_head offload_base __read_mostly; -+static struct workqueue_struct *napi_workq __read_mostly; - - static int netif_rx_internal(struct sk_buff *skb); - static int call_netdevice_notifiers_info(unsigned long val, -@@ -5940,6 +5941,11 @@ void __napi_schedule(struct napi_struct - { - unsigned long flags; - -+ if (test_bit(NAPI_STATE_THREADED, &n->state)) { -+ queue_work(napi_workq, &n->work); -+ return; -+ } -+ - local_irq_save(flags); - ____napi_schedule(this_cpu_ptr(&softnet_data), n); - local_irq_restore(flags); -@@ -5991,6 +5997,10 @@ EXPORT_SYMBOL(napi_schedule_prep); - */ - void __napi_schedule_irqoff(struct napi_struct *n) - { -+ if (test_bit(NAPI_STATE_THREADED, &n->state)) { -+ queue_work(napi_workq, &n->work); -+ return; -+ } - if (!IS_ENABLED(CONFIG_PREEMPT_RT)) - ____napi_schedule(this_cpu_ptr(&softnet_data), n); - else -@@ -6255,9 +6265,89 @@ static void init_gro_hash(struct napi_st - napi->gro_bitmask = 0; - } - -+static int __napi_poll(struct napi_struct *n, bool *repoll) -+{ -+ int work, weight; -+ -+ weight = n->weight; -+ -+ /* This NAPI_STATE_SCHED test is for avoiding a race -+ * with netpoll's poll_napi(). Only the entity which -+ * obtains the lock and sees NAPI_STATE_SCHED set will -+ * actually make the ->poll() call. Therefore we avoid -+ * accidentally calling ->poll() when NAPI is not scheduled. -+ */ -+ work = 0; -+ if (test_bit(NAPI_STATE_SCHED, &n->state)) { -+ work = n->poll(n, weight); -+ trace_napi_poll(n, work, weight); -+ } -+ -+ WARN_ON_ONCE(work > weight); -+ -+ if (likely(work < weight)) -+ return work; -+ -+ /* Drivers must not modify the NAPI state if they -+ * consume the entire weight. In such cases this code -+ * still "owns" the NAPI instance and therefore can -+ * move the instance around on the list at-will. -+ */ -+ if (unlikely(napi_disable_pending(n))) { -+ napi_complete(n); -+ return work; -+ } -+ -+ if (n->gro_bitmask) { -+ /* flush too old packets -+ * If HZ < 1000, flush all packets. -+ */ -+ napi_gro_flush(n, HZ >= 1000); -+ } -+ -+ gro_normal_list(n); -+ -+ *repoll = true; -+ -+ return work; -+} -+ -+static void napi_workfn(struct work_struct *work) -+{ -+ struct napi_struct *n = container_of(work, struct napi_struct, work); -+ void *have; -+ -+ for (;;) { -+ bool repoll = false; -+ -+ local_bh_disable(); -+ -+ have = netpoll_poll_lock(n); -+ __napi_poll(n, &repoll); -+ netpoll_poll_unlock(have); -+ -+ local_bh_enable(); -+ -+ if (!repoll) -+ return; -+ -+ if (!need_resched()) -+ continue; -+ -+ /* -+ * have to pay for the latency of task switch even if -+ * napi is scheduled -+ */ -+ queue_work(napi_workq, work); -+ return; -+ } -+} -+ - void netif_napi_add(struct net_device *dev, struct napi_struct *napi, - int (*poll)(struct napi_struct *, int), int weight) - { -+ if (dev->threaded) -+ set_bit(NAPI_STATE_THREADED, &napi->state); - INIT_LIST_HEAD(&napi->poll_list); - hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); - napi->timer.function = napi_watchdog; -@@ -6274,6 +6364,7 @@ void netif_napi_add(struct net_device *d - #ifdef CONFIG_NETPOLL - napi->poll_owner = -1; - #endif -+ INIT_WORK(&napi->work, napi_workfn); - set_bit(NAPI_STATE_SCHED, &napi->state); - set_bit(NAPI_STATE_NPSVC, &napi->state); - list_add_rcu(&napi->dev_list, &dev->napi_list); -@@ -6314,6 +6405,7 @@ static void flush_gro_hash(struct napi_s - void netif_napi_del(struct napi_struct *napi) - { - might_sleep(); -+ cancel_work_sync(&napi->work); - if (napi_hash_del(napi)) - synchronize_net(); - list_del_init(&napi->dev_list); -@@ -6326,50 +6418,18 @@ EXPORT_SYMBOL(netif_napi_del); - - static int napi_poll(struct napi_struct *n, struct list_head *repoll) - { -+ bool do_repoll = false; - void *have; -- int work, weight; -+ int work; - - list_del_init(&n->poll_list); - - have = netpoll_poll_lock(n); - -- weight = n->weight; -- -- /* This NAPI_STATE_SCHED test is for avoiding a race -- * with netpoll's poll_napi(). Only the entity which -- * obtains the lock and sees NAPI_STATE_SCHED set will -- * actually make the ->poll() call. Therefore we avoid -- * accidentally calling ->poll() when NAPI is not scheduled. -- */ -- work = 0; -- if (test_bit(NAPI_STATE_SCHED, &n->state)) { -- work = n->poll(n, weight); -- trace_napi_poll(n, work, weight); -- } -- -- WARN_ON_ONCE(work > weight); -+ work = __napi_poll(n, &do_repoll); - -- if (likely(work < weight)) -- goto out_unlock; -- -- /* Drivers must not modify the NAPI state if they -- * consume the entire weight. In such cases this code -- * still "owns" the NAPI instance and therefore can -- * move the instance around on the list at-will. -- */ -- if (unlikely(napi_disable_pending(n))) { -- napi_complete(n); -+ if (!do_repoll) - goto out_unlock; -- } -- -- if (n->gro_bitmask) { -- /* flush too old packets -- * If HZ < 1000, flush all packets. -- */ -- napi_gro_flush(n, HZ >= 1000); -- } -- -- gro_normal_list(n); - - /* Some drivers may have called napi_schedule - * prior to exhausting their budget. -@@ -10349,6 +10409,10 @@ static int __init net_dev_init(void) - sd->backlog.weight = weight_p; - } - -+ napi_workq = alloc_workqueue("napi_workq", WQ_UNBOUND | WQ_HIGHPRI, -+ WQ_UNBOUND_MAX_ACTIVE | WQ_SYSFS); -+ BUG_ON(!napi_workq); -+ - dev_boot_phase = 0; - - /* The loopback device is special if any other network devices ---- a/net/core/net-sysfs.c -+++ b/net/core/net-sysfs.c -@@ -470,6 +470,52 @@ static ssize_t proto_down_store(struct d - } - NETDEVICE_SHOW_RW(proto_down, fmt_dec); - -+static int change_napi_threaded(struct net_device *dev, unsigned long val) -+{ -+ struct napi_struct *napi; -+ -+ if (list_empty(&dev->napi_list)) -+ return -EOPNOTSUPP; -+ -+ list_for_each_entry(napi, &dev->napi_list, dev_list) { -+ if (val) -+ set_bit(NAPI_STATE_THREADED, &napi->state); -+ else -+ clear_bit(NAPI_STATE_THREADED, &napi->state); -+ } -+ -+ return 0; -+} -+ -+static ssize_t napi_threaded_store(struct device *dev, -+ struct device_attribute *attr, -+ const char *buf, size_t len) -+{ -+ return netdev_store(dev, attr, buf, len, change_napi_threaded); -+} -+ -+static ssize_t napi_threaded_show(struct device *dev, -+ struct device_attribute *attr, -+ char *buf) -+{ -+ struct net_device *netdev = to_net_dev(dev); -+ struct napi_struct *napi; -+ bool enabled = false; -+ -+ if (!rtnl_trylock()) -+ return restart_syscall(); -+ -+ list_for_each_entry(napi, &netdev->napi_list, dev_list) { -+ if (test_bit(NAPI_STATE_THREADED, &napi->state)) -+ enabled = true; -+ } -+ -+ rtnl_unlock(); -+ -+ return sprintf(buf, fmt_dec, enabled); -+} -+static DEVICE_ATTR_RW(napi_threaded); -+ - static ssize_t phys_port_id_show(struct device *dev, - struct device_attribute *attr, char *buf) - { -@@ -581,6 +627,7 @@ static struct attribute *net_class_attrs - &dev_attr_flags.attr, - &dev_attr_tx_queue_len.attr, - &dev_attr_gro_flush_timeout.attr, -+ &dev_attr_napi_threaded.attr, - &dev_attr_phys_port_id.attr, - &dev_attr_phys_port_name.attr, - &dev_attr_phys_switch_id.attr, diff --git a/target/linux/ipq40xx/patches-5.4/703-net-IPQ4019-needs-rfs-vlan_tag-callbacks-in.patch b/target/linux/ipq40xx/patches-5.4/703-net-IPQ4019-needs-rfs-vlan_tag-callbacks-in.patch index 167673bd11..1e22abdf51 100644 --- a/target/linux/ipq40xx/patches-5.4/703-net-IPQ4019-needs-rfs-vlan_tag-callbacks-in.patch +++ b/target/linux/ipq40xx/patches-5.4/703-net-IPQ4019-needs-rfs-vlan_tag-callbacks-in.patch @@ -24,7 +24,7 @@ Reviewed-by: Grant Grundler --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h -@@ -776,6 +776,16 @@ struct xps_map { +@@ -767,6 +767,16 @@ struct xps_map { #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \ - sizeof(struct xps_map)) / sizeof(u16)) @@ -41,7 +41,7 @@ Reviewed-by: Grant Grundler /* * This structure holds all XPS maps for device. Maps are indexed by CPU. */ -@@ -1379,6 +1389,9 @@ struct net_device_ops { +@@ -1370,6 +1380,9 @@ struct net_device_ops { const struct sk_buff *skb, u16 rxq_index, u32 flow_id);