Re: [v4,net-next 1/4] net: qos: introduce a gate control flow action
From: Vlad Buslov
Date: Wed Apr 29 2020 - 13:03:50 EST
Hi Po,
On Tue 28 Apr 2020 at 06:34, Po Liu <Po.Liu@xxxxxxx> wrote:
> Introduce a ingress frame gate control flow action.
> Tc gate action does the work like this:
> Assume there is a gate allow specified ingress frames can be passed at
> specific time slot, and be dropped at specific time slot. Tc filter
> chooses the ingress frames, and tc gate action would specify what slot
> does these frames can be passed to device and what time slot would be
> dropped.
> Tc gate action would provide an entry list to tell how much time gate
> keep open and how much time gate keep state close. Gate action also
> assign a start time to tell when the entry list start. Then driver would
> repeat the gate entry list cyclically.
> For the software simulation, gate action requires the user assign a time
> clock type.
>
> Below is the setting example in user space. Tc filter a stream source ip
> address is 192.168.0.20 and gate action own two time slots. One is last
> 200ms gate open let frame pass another is last 100ms gate close let
> frames dropped. When the ingress frames have reach total frames over
> 8000000 bytes, the excessive frames will be dropped in that 200000000ns
> time slot.
>
>> tc qdisc add dev eth0 ingress
>
>> tc filter add dev eth0 parent ffff: protocol ip \
> flower src_ip 192.168.0.20 \
> action gate index 2 clockid CLOCK_TAI \
> sched-entry open 200000000 -1 8000000 \
> sched-entry close 100000000 -1 -1
>
>> tc chain del dev eth0 ingress chain 0
>
> "sched-entry" follow the name taprio style. Gate state is
> "open"/"close". Follow with period nanosecond. Then next item is internal
> priority value means which ingress queue should put. "-1" means
> wildcard. The last value optional specifies the maximum number of
> MSDU octets that are permitted to pass the gate during the specified
> time interval.
> Base-time is not set will be 0 as default, as result start time would
> be ((N + 1) * cycletime) which is the minimal of future time.
>
> Below example shows filtering a stream with destination mac address is
> 10:00:80:00:00:00 and ip type is ICMP, follow the action gate. The gate
> action would run with one close time slot which means always keep close.
> The time cycle is total 200000000ns. The base-time would calculate by:
>
> 1357000000000 + (N + 1) * cycletime
>
> When the total value is the future time, it will be the start time.
> The cycletime here would be 200000000ns for this case.
>
>> tc filter add dev eth0 parent ffff: protocol ip \
> flower skip_hw ip_proto icmp dst_mac 10:00:80:00:00:00 \
> action gate index 12 base-time 1357000000000 \
> sched-entry close 200000000 -1 -1 \
> clockid CLOCK_TAI
>
> Signed-off-by: Po Liu <Po.Liu@xxxxxxx>
> ---
> include/net/tc_act/tc_gate.h | 47 ++
> include/uapi/linux/pkt_cls.h | 1 +
> include/uapi/linux/tc_act/tc_gate.h | 47 ++
> net/sched/Kconfig | 12 +
> net/sched/Makefile | 1 +
> net/sched/act_gate.c | 638 ++++++++++++++++++++++++++++
> 6 files changed, 746 insertions(+)
> create mode 100644 include/net/tc_act/tc_gate.h
> create mode 100644 include/uapi/linux/tc_act/tc_gate.h
> create mode 100644 net/sched/act_gate.c
>
> diff --git a/include/net/tc_act/tc_gate.h b/include/net/tc_act/tc_gate.h
> new file mode 100644
> index 000000000000..330ad8b02495
> --- /dev/null
> +++ b/include/net/tc_act/tc_gate.h
> @@ -0,0 +1,47 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/* Copyright 2020 NXP */
> +
> +#ifndef __NET_TC_GATE_H
> +#define __NET_TC_GATE_H
> +
> +#include <net/act_api.h>
> +#include <linux/tc_act/tc_gate.h>
> +
> +struct tcfg_gate_entry {
> + int index;
> + u8 gate_state;
> + u32 interval;
> + s32 ipv;
> + s32 maxoctets;
> + struct list_head list;
> +};
> +
> +struct tcf_gate_params {
> + s32 tcfg_priority;
> + u64 tcfg_basetime;
> + u64 tcfg_cycletime;
> + u64 tcfg_cycletime_ext;
> + u32 tcfg_flags;
> + s32 tcfg_clockid;
> + size_t num_entries;
> + struct list_head entries;
> +};
> +
> +#define GATE_ACT_GATE_OPEN BIT(0)
> +#define GATE_ACT_PENDING BIT(1)
> +
> +struct tcf_gate {
> + struct tc_action common;
> + struct tcf_gate_params param;
> + u8 current_gate_status;
> + ktime_t current_close_time;
> + u32 current_entry_octets;
> + s32 current_max_octets;
> + struct tcfg_gate_entry *next_entry;
> + struct hrtimer hitimer;
> + enum tk_offsets tk_offset;
> +};
> +
> +#define to_gate(a) ((struct tcf_gate *)a)
> +
> +#endif
> diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
> index 9f06d29cab70..fc672b232437 100644
> --- a/include/uapi/linux/pkt_cls.h
> +++ b/include/uapi/linux/pkt_cls.h
> @@ -134,6 +134,7 @@ enum tca_id {
> TCA_ID_CTINFO,
> TCA_ID_MPLS,
> TCA_ID_CT,
> + TCA_ID_GATE,
> /* other actions go here */
> __TCA_ID_MAX = 255
> };
> diff --git a/include/uapi/linux/tc_act/tc_gate.h b/include/uapi/linux/tc_act/tc_gate.h
> new file mode 100644
> index 000000000000..f214b3a6d44f
> --- /dev/null
> +++ b/include/uapi/linux/tc_act/tc_gate.h
> @@ -0,0 +1,47 @@
> +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
> +/* Copyright 2020 NXP */
> +
> +#ifndef __LINUX_TC_GATE_H
> +#define __LINUX_TC_GATE_H
> +
> +#include <linux/pkt_cls.h>
> +
> +struct tc_gate {
> + tc_gen;
> +};
> +
> +enum {
> + TCA_GATE_ENTRY_UNSPEC,
> + TCA_GATE_ENTRY_INDEX,
> + TCA_GATE_ENTRY_GATE,
> + TCA_GATE_ENTRY_INTERVAL,
> + TCA_GATE_ENTRY_IPV,
> + TCA_GATE_ENTRY_MAX_OCTETS,
> + __TCA_GATE_ENTRY_MAX,
> +};
> +#define TCA_GATE_ENTRY_MAX (__TCA_GATE_ENTRY_MAX - 1)
> +
> +enum {
> + TCA_GATE_ONE_ENTRY_UNSPEC,
> + TCA_GATE_ONE_ENTRY,
> + __TCA_GATE_ONE_ENTRY_MAX,
> +};
> +#define TCA_GATE_ONE_ENTRY_MAX (__TCA_GATE_ONE_ENTRY_MAX - 1)
> +
> +enum {
> + TCA_GATE_UNSPEC,
> + TCA_GATE_TM,
> + TCA_GATE_PARMS,
> + TCA_GATE_PAD,
> + TCA_GATE_PRIORITY,
> + TCA_GATE_ENTRY_LIST,
> + TCA_GATE_BASE_TIME,
> + TCA_GATE_CYCLE_TIME,
> + TCA_GATE_CYCLE_TIME_EXT,
> + TCA_GATE_FLAGS,
> + TCA_GATE_CLOCKID,
> + __TCA_GATE_MAX,
> +};
> +#define TCA_GATE_MAX (__TCA_GATE_MAX - 1)
> +
> +#endif
> diff --git a/net/sched/Kconfig b/net/sched/Kconfig
> index bfbefb7bff9d..2f20073f4f84 100644
> --- a/net/sched/Kconfig
> +++ b/net/sched/Kconfig
> @@ -981,6 +981,18 @@ config NET_ACT_CT
> To compile this code as a module, choose M here: the
> module will be called act_ct.
>
> +config NET_ACT_GATE
> + tristate "Frame gate entry list control tc action"
> + depends on NET_CLS_ACT
> + help
> + Say Y here to allow to control the ingress flow to be passed at
> + specific time slot and be dropped at other specific time slot by
> + the gate entry list.
> +
> + If unsure, say N.
> + To compile this code as a module, choose M here: the
> + module will be called act_gate.
> +
> config NET_IFE_SKBMARK
> tristate "Support to encoding decoding skb mark on IFE action"
> depends on NET_ACT_IFE
> diff --git a/net/sched/Makefile b/net/sched/Makefile
> index 31c367a6cd09..66bbf9a98f9e 100644
> --- a/net/sched/Makefile
> +++ b/net/sched/Makefile
> @@ -30,6 +30,7 @@ obj-$(CONFIG_NET_IFE_SKBPRIO) += act_meta_skbprio.o
> obj-$(CONFIG_NET_IFE_SKBTCINDEX) += act_meta_skbtcindex.o
> obj-$(CONFIG_NET_ACT_TUNNEL_KEY)+= act_tunnel_key.o
> obj-$(CONFIG_NET_ACT_CT) += act_ct.o
> +obj-$(CONFIG_NET_ACT_GATE) += act_gate.o
> obj-$(CONFIG_NET_SCH_FIFO) += sch_fifo.o
> obj-$(CONFIG_NET_SCH_CBQ) += sch_cbq.o
> obj-$(CONFIG_NET_SCH_HTB) += sch_htb.o
> diff --git a/net/sched/act_gate.c b/net/sched/act_gate.c
> new file mode 100644
> index 000000000000..916f6fe56692
> --- /dev/null
> +++ b/net/sched/act_gate.c
> @@ -0,0 +1,638 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/* Copyright 2020 NXP */
> +
> +#include <linux/module.h>
> +#include <linux/types.h>
> +#include <linux/kernel.h>
> +#include <linux/string.h>
> +#include <linux/errno.h>
> +#include <linux/skbuff.h>
> +#include <linux/rtnetlink.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <net/act_api.h>
> +#include <net/netlink.h>
> +#include <net/pkt_cls.h>
> +#include <net/tc_act/tc_gate.h>
> +
> +static unsigned int gate_net_id;
> +static struct tc_action_ops act_gate_ops;
> +
> +static ktime_t gate_get_time(struct tcf_gate *gact)
> +{
> + ktime_t mono = ktime_get();
> +
> + switch (gact->tk_offset) {
> + case TK_OFFS_MAX:
> + return mono;
> + default:
> + return ktime_mono_to_any(mono, gact->tk_offset);
> + }
> +
> + return KTIME_MAX;
> +}
> +
> +static int gate_get_start_time(struct tcf_gate *gact, ktime_t *start)
> +{
> + struct tcf_gate_params *param = &gact->param;
> + ktime_t now, base, cycle;
> + u64 n;
> +
> + base = ns_to_ktime(param->tcfg_basetime);
> + now = gate_get_time(gact);
> +
> + if (ktime_after(base, now)) {
> + *start = base;
> + return 0;
> + }
> +
> + cycle = param->tcfg_cycletime;
> +
> + /* cycle time should not be zero */
> + if (!cycle)
> + return -EFAULT;
> +
> + n = div64_u64(ktime_sub_ns(now, base), cycle);
> + *start = ktime_add_ns(base, (n + 1) * cycle);
> + return 0;
> +}
> +
> +static void gate_start_timer(struct tcf_gate *gact, ktime_t start)
> +{
> + ktime_t expires;
> +
> + expires = hrtimer_get_expires(&gact->hitimer);
> + if (expires == 0)
> + expires = KTIME_MAX;
> +
> + start = min_t(ktime_t, start, expires);
> +
> + hrtimer_start(&gact->hitimer, start, HRTIMER_MODE_ABS);
> +}
> +
> +static enum hrtimer_restart gate_timer_func(struct hrtimer *timer)
> +{
> + struct tcf_gate *gact = container_of(timer, struct tcf_gate,
> + hitimer);
> + struct tcf_gate_params *p = &gact->param;
> + struct tcfg_gate_entry *next;
> + ktime_t close_time, now;
> +
> + spin_lock(&gact->tcf_lock);
> +
> + next = gact->next_entry;
> +
> + /* cycle start, clear pending bit, clear total octets */
> + gact->current_gate_status = next->gate_state ? GATE_ACT_GATE_OPEN : 0;
> + gact->current_entry_octets = 0;
> + gact->current_max_octets = next->maxoctets;
> +
> + gact->current_close_time = ktime_add_ns(gact->current_close_time,
> + next->interval);
> +
> + close_time = gact->current_close_time;
> +
> + if (list_is_last(&next->list, &p->entries))
> + next = list_first_entry(&p->entries,
> + struct tcfg_gate_entry, list);
> + else
> + next = list_next_entry(next, list);
> +
> + now = gate_get_time(gact);
> +
> + if (ktime_after(now, close_time)) {
> + ktime_t cycle, base;
> + u64 n;
> +
> + cycle = p->tcfg_cycletime;
> + base = ns_to_ktime(p->tcfg_basetime);
> + n = div64_u64(ktime_sub_ns(now, base), cycle);
> + close_time = ktime_add_ns(base, (n + 1) * cycle);
> + }
> +
> + gact->next_entry = next;
> +
> + hrtimer_set_expires(&gact->hitimer, close_time);
> +
> + spin_unlock(&gact->tcf_lock);
> +
> + return HRTIMER_RESTART;
> +}
> +
> +static int tcf_gate_act(struct sk_buff *skb, const struct tc_action *a,
> + struct tcf_result *res)
> +{
> + struct tcf_gate *gact = to_gate(a);
> +
> + spin_lock_bh(&gact->tcf_lock);
I think you need to use regular spin_lock() function here because this
function is called from softirq context.
> +
> + tcf_lastuse_update(&gact->tcf_tm);
> + bstats_update(&gact->tcf_bstats, skb);
> +
> + if (unlikely(gact->current_gate_status & GATE_ACT_PENDING)) {
> + spin_unlock_bh(&gact->tcf_lock);
> + return gact->tcf_action;
> + }
> +
> + if (!(gact->current_gate_status & GATE_ACT_GATE_OPEN))
> + goto drop;
> +
> + if (gact->current_max_octets >= 0) {
> + gact->current_entry_octets += qdisc_pkt_len(skb);
> + if (gact->current_entry_octets > gact->current_max_octets) {
> + gact->tcf_qstats.overlimits++;
> + goto drop;
> + }
> + }
> +
> + spin_unlock_bh(&gact->tcf_lock);
> +
> + return gact->tcf_action;
> +drop:
> + gact->tcf_qstats.drops++;
> + spin_unlock_bh(&gact->tcf_lock);
> +
> + return TC_ACT_SHOT;
> +}
> +
> +static const struct nla_policy entry_policy[TCA_GATE_ENTRY_MAX + 1] = {
> + [TCA_GATE_ENTRY_INDEX] = { .type = NLA_U32 },
> + [TCA_GATE_ENTRY_GATE] = { .type = NLA_FLAG },
> + [TCA_GATE_ENTRY_INTERVAL] = { .type = NLA_U32 },
> + [TCA_GATE_ENTRY_IPV] = { .type = NLA_S32 },
> + [TCA_GATE_ENTRY_MAX_OCTETS] = { .type = NLA_S32 },
> +};
> +
> +static const struct nla_policy gate_policy[TCA_GATE_MAX + 1] = {
> + [TCA_GATE_PARMS] = { .len = sizeof(struct tc_gate),
> + .type = NLA_EXACT_LEN },
> + [TCA_GATE_PRIORITY] = { .type = NLA_S32 },
> + [TCA_GATE_ENTRY_LIST] = { .type = NLA_NESTED },
> + [TCA_GATE_BASE_TIME] = { .type = NLA_U64 },
> + [TCA_GATE_CYCLE_TIME] = { .type = NLA_U64 },
> + [TCA_GATE_CYCLE_TIME_EXT] = { .type = NLA_U64 },
> + [TCA_GATE_FLAGS] = { .type = NLA_U32 },
> + [TCA_GATE_CLOCKID] = { .type = NLA_S32 },
> +};
> +
> +static int fill_gate_entry(struct nlattr **tb, struct tcfg_gate_entry *entry,
> + struct netlink_ext_ack *extack)
> +{
> + u32 interval = 0;
> +
> + entry->gate_state = nla_get_flag(tb[TCA_GATE_ENTRY_GATE]);
> +
> + if (tb[TCA_GATE_ENTRY_INTERVAL])
> + interval = nla_get_u32(tb[TCA_GATE_ENTRY_INTERVAL]);
> +
> + if (interval == 0) {
> + NL_SET_ERR_MSG(extack, "Invalid interval for schedule entry");
> + return -EINVAL;
> + }
> +
> + entry->interval = interval;
> +
> + if (tb[TCA_GATE_ENTRY_IPV])
> + entry->ipv = nla_get_s32(tb[TCA_GATE_ENTRY_IPV]);
> + else
> + entry->ipv = -1;
> +
> + if (tb[TCA_GATE_ENTRY_MAX_OCTETS])
> + entry->maxoctets = nla_get_s32(tb[TCA_GATE_ENTRY_MAX_OCTETS]);
> + else
> + entry->maxoctets = -1;
> +
> + return 0;
> +}
> +
> +static int parse_gate_entry(struct nlattr *n, struct tcfg_gate_entry *entry,
> + int index, struct netlink_ext_ack *extack)
> +{
> + struct nlattr *tb[TCA_GATE_ENTRY_MAX + 1] = { };
> + int err;
> +
> + err = nla_parse_nested(tb, TCA_GATE_ENTRY_MAX, n, entry_policy, extack);
> + if (err < 0) {
> + NL_SET_ERR_MSG(extack, "Could not parse nested entry");
> + return -EINVAL;
> + }
> +
> + entry->index = index;
> +
> + return fill_gate_entry(tb, entry, extack);
> +}
> +
> +static void release_entry_list(struct list_head *entries)
> +{
> + struct tcfg_gate_entry *entry, *e;
> +
> + list_for_each_entry_safe(entry, e, entries, list) {
> + list_del(&entry->list);
> + kfree(entry);
> + }
> +}
> +
> +static int parse_gate_list(struct nlattr *list_attr,
> + struct tcf_gate_params *sched,
> + struct netlink_ext_ack *extack)
> +{
> + struct tcfg_gate_entry *entry;
> + struct nlattr *n;
> + int err, rem;
> + int i = 0;
> +
> + if (!list_attr)
> + return -EINVAL;
> +
> + nla_for_each_nested(n, list_attr, rem) {
> + if (nla_type(n) != TCA_GATE_ONE_ENTRY) {
> + NL_SET_ERR_MSG(extack, "Attribute isn't type 'entry'");
> + continue;
> + }
> +
> + entry = kzalloc(sizeof(*entry), GFP_KERNEL);
> + if (!entry) {
> + NL_SET_ERR_MSG(extack, "Not enough memory for entry");
> + err = -ENOMEM;
> + goto release_list;
> + }
> +
> + err = parse_gate_entry(n, entry, i, extack);
> + if (err < 0) {
> + kfree(entry);
> + goto release_list;
> + }
> +
> + list_add_tail(&entry->list, &sched->entries);
> + i++;
> + }
> +
> + sched->num_entries = i;
> +
> + return i;
> +
> +release_list:
> + release_entry_list(&sched->entries);
> +
> + return err;
> +}
> +
> +static int tcf_gate_init(struct net *net, struct nlattr *nla,
> + struct nlattr *est, struct tc_action **a,
> + int ovr, int bind, bool rtnl_held,
> + struct tcf_proto *tp, u32 flags,
> + struct netlink_ext_ack *extack)
> +{
> + struct tc_action_net *tn = net_generic(net, gate_net_id);
> + enum tk_offsets tk_offset = TK_OFFS_TAI;
> + struct nlattr *tb[TCA_GATE_MAX + 1];
> + struct tcf_chain *goto_ch = NULL;
> + struct tcf_gate_params *p;
> + s32 clockid = CLOCK_TAI;
> + struct tcf_gate *gact;
> + struct tc_gate *parm;
> + int ret = 0, err;
> + u64 basetime = 0;
> + u32 gflags = 0;
> + s32 prio = -1;
> + ktime_t start;
> + u32 index;
> +
> + if (!nla)
> + return -EINVAL;
> +
> + err = nla_parse_nested(tb, TCA_GATE_MAX, nla, gate_policy, extack);
> + if (err < 0)
> + return err;
> +
> + if (!tb[TCA_GATE_PARMS])
> + return -EINVAL;
> +
> + parm = nla_data(tb[TCA_GATE_PARMS]);
> + index = parm->index;
> +
> + err = tcf_idr_check_alloc(tn, &index, a, bind);
> + if (err < 0)
> + return err;
> +
> + if (err && bind)
> + return 0;
> +
> + if (!err) {
> + ret = tcf_idr_create(tn, index, est, a,
> + &act_gate_ops, bind, false, 0);
> + if (ret) {
> + tcf_idr_cleanup(tn, index);
> + return ret;
> + }
> +
> + ret = ACT_P_CREATED;
> + } else if (!ovr) {
> + tcf_idr_release(*a, bind);
> + return -EEXIST;
> + }
> +
> + if (tb[TCA_GATE_PRIORITY])
> + prio = nla_get_s32(tb[TCA_GATE_PRIORITY]);
> +
> + if (tb[TCA_GATE_BASE_TIME])
> + basetime = nla_get_u64(tb[TCA_GATE_BASE_TIME]);
> +
> + if (tb[TCA_GATE_FLAGS])
> + gflags = nla_get_u32(tb[TCA_GATE_FLAGS]);
> +
> + if (tb[TCA_GATE_CLOCKID]) {
> + clockid = nla_get_s32(tb[TCA_GATE_CLOCKID]);
> + switch (clockid) {
> + case CLOCK_REALTIME:
> + tk_offset = TK_OFFS_REAL;
> + break;
> + case CLOCK_MONOTONIC:
> + tk_offset = TK_OFFS_MAX;
> + break;
> + case CLOCK_BOOTTIME:
> + tk_offset = TK_OFFS_BOOT;
> + break;
> + case CLOCK_TAI:
> + tk_offset = TK_OFFS_TAI;
> + break;
> + default:
> + NL_SET_ERR_MSG(extack, "Invalid 'clockid'");
> + goto release_idr;
> + }
> + }
> +
> + err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
> + if (err < 0)
> + goto release_idr;
> +
> + gact = to_gate(*a);
> +
> + spin_lock_bh(&gact->tcf_lock);
> + p = &gact->param;
> +
> + if (tb[TCA_GATE_CYCLE_TIME]) {
> + p->tcfg_cycletime = nla_get_u64(tb[TCA_GATE_CYCLE_TIME]);
> + if (!p->tcfg_cycletime_ext)
> + goto chain_put;
> + }
> +
> + INIT_LIST_HEAD(&p->entries);
> + if (tb[TCA_GATE_ENTRY_LIST]) {
> + err = parse_gate_list(tb[TCA_GATE_ENTRY_LIST], p, extack);
> + if (err < 0)
> + goto chain_put;
> + }
> +
> + if (!p->tcfg_cycletime) {
> + struct tcfg_gate_entry *entry;
> + ktime_t cycle = 0;
> +
> + list_for_each_entry(entry, &p->entries, list)
> + cycle = ktime_add_ns(cycle, entry->interval);
> + p->tcfg_cycletime = cycle;
> + }
> +
> + if (tb[TCA_GATE_CYCLE_TIME_EXT])
> + p->tcfg_cycletime_ext =
> + nla_get_u64(tb[TCA_GATE_CYCLE_TIME_EXT]);
> +
> + p->tcfg_priority = prio;
> + p->tcfg_basetime = basetime;
> + p->tcfg_clockid = clockid;
> + p->tcfg_flags = gflags;
> +
> + gact->tk_offset = tk_offset;
> + hrtimer_init(&gact->hitimer, clockid, HRTIMER_MODE_ABS);
> + gact->hitimer.function = gate_timer_func;
> +
> + err = gate_get_start_time(gact, &start);
> + if (err < 0) {
> + NL_SET_ERR_MSG(extack,
> + "Internal error: failed get start time");
> + release_entry_list(&p->entries);
> + goto chain_put;
> + }
> +
> + gact->current_close_time = start;
> + gact->current_gate_status = GATE_ACT_GATE_OPEN | GATE_ACT_PENDING;
> +
> + gact->next_entry = list_first_entry(&p->entries,
> + struct tcfg_gate_entry, list);
> +
> + goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
> +
> + gate_start_timer(gact, start);
> +
> + spin_unlock_bh(&gact->tcf_lock);
> +
> + if (goto_ch)
> + tcf_chain_put_by_act(goto_ch);
> +
> + if (ret == ACT_P_CREATED)
> + tcf_idr_insert(tn, *a);
> + return ret;
> +
> +chain_put:
> + spin_unlock_bh(&gact->tcf_lock);
> +
> + if (goto_ch)
> + tcf_chain_put_by_act(goto_ch);
> +release_idr:
> + tcf_idr_release(*a, bind);
> + return err;
> +}
> +
> +static void tcf_gate_cleanup(struct tc_action *a)
> +{
> + struct tcf_gate *gact = to_gate(a);
> + struct tcf_gate_params *p;
> +
> + spin_lock_bh(&gact->tcf_lock);
No need to lock in tc_action_ops->cleanup() callbacks.
> +
> + hrtimer_cancel(&gact->hitimer);
> +
> + p = &gact->param;
> + release_entry_list(&p->entries);
> +
> + spin_unlock_bh(&gact->tcf_lock);
> +}
> +
> +static int dumping_entry(struct sk_buff *skb,
> + struct tcfg_gate_entry *entry)
> +{
> + struct nlattr *item;
> +
> + item = nla_nest_start_noflag(skb, TCA_GATE_ONE_ENTRY);
> + if (!item)
> + return -ENOSPC;
> +
> + if (nla_put_u32(skb, TCA_GATE_ENTRY_INDEX, entry->index))
> + goto nla_put_failure;
> +
> + if (entry->gate_state && nla_put_flag(skb, TCA_GATE_ENTRY_GATE))
> + goto nla_put_failure;
> +
> + if (nla_put_u32(skb, TCA_GATE_ENTRY_INTERVAL, entry->interval))
> + goto nla_put_failure;
> +
> + if (nla_put_s32(skb, TCA_GATE_ENTRY_MAX_OCTETS, entry->maxoctets))
> + goto nla_put_failure;
> +
> + if (nla_put_s32(skb, TCA_GATE_ENTRY_IPV, entry->ipv))
> + goto nla_put_failure;
> +
> + return nla_nest_end(skb, item);
> +
> +nla_put_failure:
> + nla_nest_cancel(skb, item);
> + return -1;
> +}
> +
> +static int tcf_gate_dump(struct sk_buff *skb, struct tc_action *a,
> + int bind, int ref)
> +{
> + unsigned char *b = skb_tail_pointer(skb);
> + struct tcf_gate *gact = to_gate(a);
> + struct tc_gate opt = {
> + .index = gact->tcf_index,
> + .refcnt = refcount_read(&gact->tcf_refcnt) - ref,
> + .bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
> + };
> + struct tcfg_gate_entry *entry;
> + struct tcf_gate_params *p;
> + struct nlattr *entry_list;
> + struct tcf_t t;
> +
> + spin_lock_bh(&gact->tcf_lock);
> + opt.action = gact->tcf_action;
> +
> + p = &gact->param;
> +
> + if (nla_put(skb, TCA_GATE_PARMS, sizeof(opt), &opt))
> + goto nla_put_failure;
> +
> + if (nla_put_u64_64bit(skb, TCA_GATE_BASE_TIME,
> + p->tcfg_basetime, TCA_GATE_PAD))
> + goto nla_put_failure;
> +
> + if (nla_put_u64_64bit(skb, TCA_GATE_CYCLE_TIME,
> + p->tcfg_cycletime, TCA_GATE_PAD))
> + goto nla_put_failure;
> +
> + if (nla_put_u64_64bit(skb, TCA_GATE_CYCLE_TIME_EXT,
> + p->tcfg_cycletime_ext, TCA_GATE_PAD))
> + goto nla_put_failure;
> +
> + if (nla_put_s32(skb, TCA_GATE_CLOCKID, p->tcfg_clockid))
> + goto nla_put_failure;
> +
> + if (nla_put_u32(skb, TCA_GATE_FLAGS, p->tcfg_flags))
> + goto nla_put_failure;
> +
> + if (nla_put_s32(skb, TCA_GATE_PRIORITY, p->tcfg_priority))
> + goto nla_put_failure;
> +
> + entry_list = nla_nest_start_noflag(skb, TCA_GATE_ENTRY_LIST);
> + if (!entry_list)
> + goto nla_put_failure;
> +
> + list_for_each_entry(entry, &p->entries, list) {
> + if (dumping_entry(skb, entry) < 0)
> + goto nla_put_failure;
> + }
> +
> + nla_nest_end(skb, entry_list);
> +
> + tcf_tm_dump(&t, &gact->tcf_tm);
> + if (nla_put_64bit(skb, TCA_GATE_TM, sizeof(t), &t, TCA_GATE_PAD))
> + goto nla_put_failure;
> + spin_unlock_bh(&gact->tcf_lock);
> +
> + return skb->len;
> +
> +nla_put_failure:
> + spin_unlock_bh(&gact->tcf_lock);
> + nlmsg_trim(skb, b);
> + return -1;
> +}
> +
> +static int tcf_gate_walker(struct net *net, struct sk_buff *skb,
> + struct netlink_callback *cb, int type,
> + const struct tc_action_ops *ops,
> + struct netlink_ext_ack *extack)
> +{
> + struct tc_action_net *tn = net_generic(net, gate_net_id);
> +
> + return tcf_generic_walker(tn, skb, cb, type, ops, extack);
> +}
> +
> +static void tcf_gate_stats_update(struct tc_action *a, u64 bytes, u32 packets,
> + u64 lastuse, bool hw)
> +{
> + struct tcf_gate *gact = to_gate(a);
> + struct tcf_t *tm = &gact->tcf_tm;
> +
> + tcf_action_update_stats(a, bytes, packets, false, hw);
> + tm->lastuse = max_t(u64, tm->lastuse, lastuse);
> +}
> +
> +static int tcf_gate_search(struct net *net, struct tc_action **a, u32 index)
> +{
> + struct tc_action_net *tn = net_generic(net, gate_net_id);
> +
> + return tcf_idr_search(tn, a, index);
> +}
> +
> +static size_t tcf_gate_get_fill_size(const struct tc_action *act)
> +{
> + return nla_total_size(sizeof(struct tc_gate));
> +}
> +
> +static struct tc_action_ops act_gate_ops = {
> + .kind = "gate",
> + .id = TCA_ID_GATE,
> + .owner = THIS_MODULE,
> + .act = tcf_gate_act,
> + .dump = tcf_gate_dump,
> + .init = tcf_gate_init,
> + .cleanup = tcf_gate_cleanup,
> + .walk = tcf_gate_walker,
> + .stats_update = tcf_gate_stats_update,
> + .get_fill_size = tcf_gate_get_fill_size,
> + .lookup = tcf_gate_search,
> + .size = sizeof(struct tcf_gate),
> +};
> +
> +static __net_init int gate_init_net(struct net *net)
> +{
> + struct tc_action_net *tn = net_generic(net, gate_net_id);
> +
> + return tc_action_net_init(net, tn, &act_gate_ops);
> +}
> +
> +static void __net_exit gate_exit_net(struct list_head *net_list)
> +{
> + tc_action_net_exit(net_list, gate_net_id);
> +}
> +
> +static struct pernet_operations gate_net_ops = {
> + .init = gate_init_net,
> + .exit_batch = gate_exit_net,
> + .id = &gate_net_id,
> + .size = sizeof(struct tc_action_net),
> +};
> +
> +static int __init gate_init_module(void)
> +{
> + return tcf_register_action(&act_gate_ops, &gate_net_ops);
> +}
> +
> +static void __exit gate_cleanup_module(void)
> +{
> + tcf_unregister_action(&act_gate_ops, &gate_net_ops);
> +}
> +
> +module_init(gate_init_module);
> +module_exit(gate_cleanup_module);
> +MODULE_LICENSE("GPL v2");