From 13926d19a11e303f12571df61b7bb64f17cb4561 Mon Sep 17 00:00:00 2001 From: Baowen Zheng Date: Fri, 17 Dec 2021 19:16:27 +0100 Subject: flow_offload: add reoffload process to update hw_count Add reoffload process to update hw_count when driver is inserted or removed. We will delete the action if it is with skip_sw flag and not offloaded to any hardware in reoffload process. When reoffloading actions, we still offload the actions that are added independent of filters. Signed-off-by: Baowen Zheng Signed-off-by: Louis Peens Signed-off-by: Simon Horman Signed-off-by: David S. Miller --- include/net/act_api.h | 11 +++ net/core/flow_offload.c | 4 + net/sched/act_api.c | 252 ++++++++++++++++++++++++++++++++++++++++++++---- 3 files changed, 250 insertions(+), 17 deletions(-) diff --git a/include/net/act_api.h b/include/net/act_api.h index 20104dfdd57c..0f5f69deb3ce 100644 --- a/include/net/act_api.h +++ b/include/net/act_api.h @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -254,6 +255,8 @@ void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); int tcf_action_update_hw_stats(struct tc_action *action); +int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, + void *cb_priv, bool add); int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, struct tcf_chain **handle, struct netlink_ext_ack *newchain); @@ -265,6 +268,14 @@ DECLARE_STATIC_KEY_FALSE(tcf_frag_xmit_count); #endif int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); + +#else /* !CONFIG_NET_CLS_ACT */ + +static inline int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, + void *cb_priv, bool add) { + return 0; +} + #endif /* CONFIG_NET_CLS_ACT */ static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c index 022c945817fa..73f68d4625f3 100644 --- a/net/core/flow_offload.c +++ b/net/core/flow_offload.c @@ -1,6 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0 */ #include #include +#include #include #include #include @@ -417,6 +418,8 @@ int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv) existing_qdiscs_register(cb, cb_priv); mutex_unlock(&flow_indr_block_lock); + tcf_action_reoffload_cb(cb, cb_priv, true); + return 0; } EXPORT_SYMBOL(flow_indr_dev_register); @@ -469,6 +472,7 @@ void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv, __flow_block_indr_cleanup(release, cb_priv, &cleanup_list); mutex_unlock(&flow_indr_block_lock); + tcf_action_reoffload_cb(cb, cb_priv, false); flow_block_indr_notify(&cleanup_list); kfree(indr_dev); } diff --git a/net/sched/act_api.c b/net/sched/act_api.c index b32680ad75d3..99f998be2040 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -137,6 +137,19 @@ static void offload_action_hw_count_set(struct tc_action *act, act->in_hw_count = hw_count; } +static void offload_action_hw_count_inc(struct tc_action *act, + u32 hw_count) +{ + act->in_hw_count += hw_count; +} + +static void offload_action_hw_count_dec(struct tc_action *act, + u32 hw_count) +{ + act->in_hw_count = act->in_hw_count > hw_count ? + act->in_hw_count - hw_count : 0; +} + static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act) { if (is_tcf_pedit(act)) @@ -183,9 +196,8 @@ static int offload_action_init(struct flow_offload_action *fl_action, return -EOPNOTSUPP; } -static int tcf_action_offload_cmd(struct flow_offload_action *fl_act, - u32 *hw_count, - struct netlink_ext_ack *extack) +static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act, + u32 *hw_count) { int err; @@ -200,9 +212,37 @@ static int tcf_action_offload_cmd(struct flow_offload_action *fl_act, return 0; } -/* offload the tc action after it is inserted */ -static int tcf_action_offload_add(struct tc_action *action, - struct netlink_ext_ack *extack) +static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act, + u32 *hw_count, + flow_indr_block_bind_cb_t *cb, + void *cb_priv) +{ + int err; + + err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL); + if (err < 0) + return err; + + if (hw_count) + *hw_count = 1; + + return 0; +} + +static int tcf_action_offload_cmd(struct flow_offload_action *fl_act, + u32 *hw_count, + flow_indr_block_bind_cb_t *cb, + void *cb_priv) +{ + return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count, + cb, cb_priv) : + tcf_action_offload_cmd_ex(fl_act, hw_count); +} + +static int tcf_action_offload_add_ex(struct tc_action *action, + struct netlink_ext_ack *extack, + flow_indr_block_bind_cb_t *cb, + void *cb_priv) { bool skip_sw = tc_act_skip_sw(action->tcfa_flags); struct tc_action *actions[TCA_ACT_MAX_PRIO] = { @@ -231,9 +271,10 @@ static int tcf_action_offload_add(struct tc_action *action, goto fl_err; } - err = tcf_action_offload_cmd(fl_action, &in_hw_count, extack); + err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv); if (!err) - offload_action_hw_count_set(action, in_hw_count); + cb ? offload_action_hw_count_inc(action, in_hw_count) : + offload_action_hw_count_set(action, in_hw_count); if (skip_sw && !tc_act_in_hw(action)) err = -EINVAL; @@ -246,6 +287,13 @@ fl_err: return err; } +/* offload the tc action after it is inserted */ +static int tcf_action_offload_add(struct tc_action *action, + struct netlink_ext_ack *extack) +{ + return tcf_action_offload_add_ex(action, extack, NULL, NULL); +} + int tcf_action_update_hw_stats(struct tc_action *action) { struct flow_offload_action fl_act = {}; @@ -258,7 +306,7 @@ int tcf_action_update_hw_stats(struct tc_action *action) if (err) return err; - err = tcf_action_offload_cmd(&fl_act, NULL, NULL); + err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL); if (!err) { preempt_disable(); tcf_action_stats_update(action, fl_act.stats.bytes, @@ -277,7 +325,9 @@ int tcf_action_update_hw_stats(struct tc_action *action) } EXPORT_SYMBOL(tcf_action_update_hw_stats); -static int tcf_action_offload_del(struct tc_action *action) +static int tcf_action_offload_del_ex(struct tc_action *action, + flow_indr_block_bind_cb_t *cb, + void *cb_priv) { struct flow_offload_action fl_act = {}; u32 in_hw_count = 0; @@ -290,16 +340,25 @@ static int tcf_action_offload_del(struct tc_action *action) if (err) return err; - err = tcf_action_offload_cmd(&fl_act, &in_hw_count, NULL); - if (err) + err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv); + if (err < 0) return err; - if (action->in_hw_count != in_hw_count) + if (!cb && action->in_hw_count != in_hw_count) return -EINVAL; + /* do not need to update hw state when deleting action */ + if (cb && in_hw_count) + offload_action_hw_count_dec(action, in_hw_count); + return 0; } +static int tcf_action_offload_del(struct tc_action *action) +{ + return tcf_action_offload_del_ex(action, NULL, NULL); +} + static void tcf_action_cleanup(struct tc_action *p) { tcf_action_offload_del(p); @@ -794,6 +853,59 @@ EXPORT_SYMBOL(tcf_idrinfo_destroy); static LIST_HEAD(act_base); static DEFINE_RWLOCK(act_mod_lock); +/* since act ops id is stored in pernet subsystem list, + * then there is no way to walk through only all the action + * subsystem, so we keep tc action pernet ops id for + * reoffload to walk through. + */ +static LIST_HEAD(act_pernet_id_list); +static DEFINE_MUTEX(act_id_mutex); +struct tc_act_pernet_id { + struct list_head list; + unsigned int id; +}; + +static int tcf_pernet_add_id_list(unsigned int id) +{ + struct tc_act_pernet_id *id_ptr; + int ret = 0; + + mutex_lock(&act_id_mutex); + list_for_each_entry(id_ptr, &act_pernet_id_list, list) { + if (id_ptr->id == id) { + ret = -EEXIST; + goto err_out; + } + } + + id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL); + if (!id_ptr) { + ret = -ENOMEM; + goto err_out; + } + id_ptr->id = id; + + list_add_tail(&id_ptr->list, &act_pernet_id_list); + +err_out: + mutex_unlock(&act_id_mutex); + return ret; +} + +static void tcf_pernet_del_id_list(unsigned int id) +{ + struct tc_act_pernet_id *id_ptr; + + mutex_lock(&act_id_mutex); + list_for_each_entry(id_ptr, &act_pernet_id_list, list) { + if (id_ptr->id == id) { + list_del(&id_ptr->list); + kfree(id_ptr); + break; + } + } + mutex_unlock(&act_id_mutex); +} int tcf_register_action(struct tc_action_ops *act, struct pernet_operations *ops) @@ -812,18 +924,31 @@ int tcf_register_action(struct tc_action_ops *act, if (ret) return ret; + if (ops->id) { + ret = tcf_pernet_add_id_list(*ops->id); + if (ret) + goto err_id; + } + write_lock(&act_mod_lock); list_for_each_entry(a, &act_base, head) { if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) { - write_unlock(&act_mod_lock); - unregister_pernet_subsys(ops); - return -EEXIST; + ret = -EEXIST; + goto err_out; } } list_add_tail(&act->head, &act_base); write_unlock(&act_mod_lock); return 0; + +err_out: + write_unlock(&act_mod_lock); + if (ops->id) + tcf_pernet_del_id_list(*ops->id); +err_id: + unregister_pernet_subsys(ops); + return ret; } EXPORT_SYMBOL(tcf_register_action); @@ -842,8 +967,11 @@ int tcf_unregister_action(struct tc_action_ops *act, } } write_unlock(&act_mod_lock); - if (!err) + if (!err) { unregister_pernet_subsys(ops); + if (ops->id) + tcf_pernet_del_id_list(*ops->id); + } return err; } EXPORT_SYMBOL(tcf_unregister_action); @@ -1595,6 +1723,96 @@ static int tcf_action_delete(struct net *net, struct tc_action *actions[]) return 0; } +static int +tcf_reoffload_del_notify(struct net *net, struct tc_action *action) +{ + size_t attr_size = tcf_action_fill_size(action); + struct tc_action *actions[TCA_ACT_MAX_PRIO] = { + [0] = action, + }; + const struct tc_action_ops *ops = action->ops; + struct sk_buff *skb; + int ret; + + skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, + GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1) <= 0) { + kfree_skb(skb); + return -EINVAL; + } + + ret = tcf_idr_release_unsafe(action); + if (ret == ACT_P_DELETED) { + module_put(ops->owner); + ret = rtnetlink_send(skb, net, 0, RTNLGRP_TC, 0); + } else { + kfree_skb(skb); + } + + return ret; +} + +int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, + void *cb_priv, bool add) +{ + struct tc_act_pernet_id *id_ptr; + struct tcf_idrinfo *idrinfo; + struct tc_action_net *tn; + struct tc_action *p; + unsigned int act_id; + unsigned long tmp; + unsigned long id; + struct idr *idr; + struct net *net; + int ret; + + if (!cb) + return -EINVAL; + + down_read(&net_rwsem); + mutex_lock(&act_id_mutex); + + for_each_net(net) { + list_for_each_entry(id_ptr, &act_pernet_id_list, list) { + act_id = id_ptr->id; + tn = net_generic(net, act_id); + if (!tn) + continue; + idrinfo = tn->idrinfo; + if (!idrinfo) + continue; + + mutex_lock(&idrinfo->lock); + idr = &idrinfo->action_idr; + idr_for_each_entry_ul(idr, p, tmp, id) { + if (IS_ERR(p) || tc_act_bind(p->tcfa_flags)) + continue; + if (add) { + tcf_action_offload_add_ex(p, NULL, cb, + cb_priv); + continue; + } + + /* cb unregister to update hw count */ + ret = tcf_action_offload_del_ex(p, cb, cb_priv); + if (ret < 0) + continue; + if (tc_act_skip_sw(p->tcfa_flags) && + !tc_act_in_hw(p)) + tcf_reoffload_del_notify(net, p); + } + mutex_unlock(&idrinfo->lock); + } + } + mutex_unlock(&act_id_mutex); + up_read(&net_rwsem); + + return 0; +} + static int tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], u32 portid, size_t attr_size, struct netlink_ext_ack *extack) -- cgit