diff options
Diffstat (limited to 'net/sched/cls_matchall.c')
| -rw-r--r-- | net/sched/cls_matchall.c | 419 |
1 files changed, 419 insertions, 0 deletions
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c new file mode 100644 index 000000000..43f8df584 --- /dev/null +++ b/net/sched/cls_matchall.c @@ -0,0 +1,419 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/cls_matchll.c Match-all classifier + * + * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com> + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/percpu.h> + +#include <net/sch_generic.h> +#include <net/pkt_cls.h> + +struct cls_mall_head { + struct tcf_exts exts; + struct tcf_result res; + u32 handle; + u32 flags; + unsigned int in_hw_count; + struct tc_matchall_pcnt __percpu *pf; + struct rcu_work rwork; + bool deleting; +}; + +static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, + struct tcf_result *res) +{ + struct cls_mall_head *head = rcu_dereference_bh(tp->root); + + if (unlikely(!head)) + return -1; + + if (tc_skip_sw(head->flags)) + return -1; + + *res = head->res; + __this_cpu_inc(head->pf->rhit); + return tcf_exts_exec(skb, &head->exts, res); +} + +static int mall_init(struct tcf_proto *tp) +{ + return 0; +} + +static void __mall_destroy(struct cls_mall_head *head) +{ + tcf_exts_destroy(&head->exts); + tcf_exts_put_net(&head->exts); + free_percpu(head->pf); + kfree(head); +} + +static void mall_destroy_work(struct work_struct *work) +{ + struct cls_mall_head *head = container_of(to_rcu_work(work), + struct cls_mall_head, + rwork); + rtnl_lock(); + __mall_destroy(head); + rtnl_unlock(); +} + +static void mall_destroy_hw_filter(struct tcf_proto *tp, + struct cls_mall_head *head, + unsigned long cookie, + struct netlink_ext_ack *extack) +{ + struct tc_cls_matchall_offload cls_mall = {}; + struct tcf_block *block = tp->chain->block; + + tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); + cls_mall.command = TC_CLSMATCHALL_DESTROY; + cls_mall.cookie = cookie; + + tc_setup_cb_destroy(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, false, + &head->flags, &head->in_hw_count, true); +} + +static int mall_replace_hw_filter(struct tcf_proto *tp, + struct cls_mall_head *head, + unsigned long cookie, + struct netlink_ext_ack *extack) +{ + struct tc_cls_matchall_offload cls_mall = {}; + struct tcf_block *block = tp->chain->block; + bool skip_sw = tc_skip_sw(head->flags); + int err; + + cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); + if (!cls_mall.rule) + return -ENOMEM; + + tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); + cls_mall.command = TC_CLSMATCHALL_REPLACE; + cls_mall.cookie = cookie; + + err = tc_setup_offload_action(&cls_mall.rule->action, &head->exts, + cls_mall.common.extack); + if (err) { + kfree(cls_mall.rule); + mall_destroy_hw_filter(tp, head, cookie, NULL); + + return skip_sw ? err : 0; + } + + err = tc_setup_cb_add(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, + skip_sw, &head->flags, &head->in_hw_count, true); + tc_cleanup_offload_action(&cls_mall.rule->action); + kfree(cls_mall.rule); + + if (err) { + mall_destroy_hw_filter(tp, head, cookie, NULL); + return err; + } + + if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) + return -EINVAL; + + return 0; +} + +static void mall_destroy(struct tcf_proto *tp, bool rtnl_held, + struct netlink_ext_ack *extack) +{ + struct cls_mall_head *head = rtnl_dereference(tp->root); + + if (!head) + return; + + tcf_unbind_filter(tp, &head->res); + + if (!tc_skip_hw(head->flags)) + mall_destroy_hw_filter(tp, head, (unsigned long) head, extack); + + if (tcf_exts_get_net(&head->exts)) + tcf_queue_work(&head->rwork, mall_destroy_work); + else + __mall_destroy(head); +} + +static void *mall_get(struct tcf_proto *tp, u32 handle) +{ + struct cls_mall_head *head = rtnl_dereference(tp->root); + + if (head && head->handle == handle) + return head; + + return NULL; +} + +static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { + [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, + [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, + [TCA_MATCHALL_FLAGS] = { .type = NLA_U32 }, +}; + +static int mall_change(struct net *net, struct sk_buff *in_skb, + struct tcf_proto *tp, unsigned long base, + u32 handle, struct nlattr **tca, + void **arg, u32 flags, + struct netlink_ext_ack *extack) +{ + struct cls_mall_head *head = rtnl_dereference(tp->root); + struct nlattr *tb[TCA_MATCHALL_MAX + 1]; + bool bound_to_filter = false; + struct cls_mall_head *new; + u32 userflags = 0; + int err; + + if (!tca[TCA_OPTIONS]) + return -EINVAL; + + if (head) + return -EEXIST; + + err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX, + tca[TCA_OPTIONS], mall_policy, NULL); + if (err < 0) + return err; + + if (tb[TCA_MATCHALL_FLAGS]) { + userflags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); + if (!tc_flags_valid(userflags)) + return -EINVAL; + } + + new = kzalloc(sizeof(*new), GFP_KERNEL); + if (!new) + return -ENOBUFS; + + err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0); + if (err) + goto err_exts_init; + + if (!handle) + handle = 1; + new->handle = handle; + new->flags = userflags; + new->pf = alloc_percpu(struct tc_matchall_pcnt); + if (!new->pf) { + err = -ENOMEM; + goto err_alloc_percpu; + } + + err = tcf_exts_validate_ex(net, tp, tb, tca[TCA_RATE], + &new->exts, flags, new->flags, extack); + if (err < 0) + goto err_set_parms; + + if (tb[TCA_MATCHALL_CLASSID]) { + new->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); + tcf_bind_filter(tp, &new->res, base); + bound_to_filter = true; + } + + if (!tc_skip_hw(new->flags)) { + err = mall_replace_hw_filter(tp, new, (unsigned long)new, + extack); + if (err) + goto err_replace_hw_filter; + } + + if (!tc_in_hw(new->flags)) + new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; + + *arg = head; + rcu_assign_pointer(tp->root, new); + return 0; + +err_replace_hw_filter: + if (bound_to_filter) + tcf_unbind_filter(tp, &new->res); +err_set_parms: + free_percpu(new->pf); +err_alloc_percpu: + tcf_exts_destroy(&new->exts); +err_exts_init: + kfree(new); + return err; +} + +static int mall_delete(struct tcf_proto *tp, void *arg, bool *last, + bool rtnl_held, struct netlink_ext_ack *extack) +{ + struct cls_mall_head *head = rtnl_dereference(tp->root); + + head->deleting = true; + *last = true; + return 0; +} + +static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg, + bool rtnl_held) +{ + struct cls_mall_head *head = rtnl_dereference(tp->root); + + if (arg->count < arg->skip) + goto skip; + + if (!head || head->deleting) + return; + if (arg->fn(tp, head, arg) < 0) + arg->stop = 1; +skip: + arg->count++; +} + +static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, + void *cb_priv, struct netlink_ext_ack *extack) +{ + struct cls_mall_head *head = rtnl_dereference(tp->root); + struct tc_cls_matchall_offload cls_mall = {}; + struct tcf_block *block = tp->chain->block; + int err; + + if (tc_skip_hw(head->flags)) + return 0; + + cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); + if (!cls_mall.rule) + return -ENOMEM; + + tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); + cls_mall.command = add ? + TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY; + cls_mall.cookie = (unsigned long)head; + + err = tc_setup_offload_action(&cls_mall.rule->action, &head->exts, + cls_mall.common.extack); + if (err) { + kfree(cls_mall.rule); + + return add && tc_skip_sw(head->flags) ? err : 0; + } + + err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSMATCHALL, + &cls_mall, cb_priv, &head->flags, + &head->in_hw_count); + tc_cleanup_offload_action(&cls_mall.rule->action); + kfree(cls_mall.rule); + + return err; +} + +static void mall_stats_hw_filter(struct tcf_proto *tp, + struct cls_mall_head *head, + unsigned long cookie) +{ + struct tc_cls_matchall_offload cls_mall = {}; + struct tcf_block *block = tp->chain->block; + + tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL); + cls_mall.command = TC_CLSMATCHALL_STATS; + cls_mall.cookie = cookie; + + tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false, true); + + tcf_exts_hw_stats_update(&head->exts, cls_mall.stats.bytes, + cls_mall.stats.pkts, cls_mall.stats.drops, + cls_mall.stats.lastused, + cls_mall.stats.used_hw_stats, + cls_mall.stats.used_hw_stats_valid); +} + +static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, + struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) +{ + struct tc_matchall_pcnt gpf = {}; + struct cls_mall_head *head = fh; + struct nlattr *nest; + int cpu; + + if (!head) + return skb->len; + + if (!tc_skip_hw(head->flags)) + mall_stats_hw_filter(tp, head, (unsigned long)head); + + t->tcm_handle = head->handle; + + nest = nla_nest_start_noflag(skb, TCA_OPTIONS); + if (!nest) + goto nla_put_failure; + + if (head->res.classid && + nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) + goto nla_put_failure; + + if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) + goto nla_put_failure; + + for_each_possible_cpu(cpu) { + struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu); + + gpf.rhit += pf->rhit; + } + + if (nla_put_64bit(skb, TCA_MATCHALL_PCNT, + sizeof(struct tc_matchall_pcnt), + &gpf, TCA_MATCHALL_PAD)) + goto nla_put_failure; + + if (tcf_exts_dump(skb, &head->exts)) + goto nla_put_failure; + + nla_nest_end(skb, nest); + + if (tcf_exts_dump_stats(skb, &head->exts) < 0) + goto nla_put_failure; + + return skb->len; + +nla_put_failure: + nla_nest_cancel(skb, nest); + return -1; +} + +static void mall_bind_class(void *fh, u32 classid, unsigned long cl, void *q, + unsigned long base) +{ + struct cls_mall_head *head = fh; + + tc_cls_bind_class(classid, cl, q, &head->res, base); +} + +static struct tcf_proto_ops cls_mall_ops __read_mostly = { + .kind = "matchall", + .classify = mall_classify, + .init = mall_init, + .destroy = mall_destroy, + .get = mall_get, + .change = mall_change, + .delete = mall_delete, + .walk = mall_walk, + .reoffload = mall_reoffload, + .dump = mall_dump, + .bind_class = mall_bind_class, + .owner = THIS_MODULE, +}; + +static int __init cls_mall_init(void) +{ + return register_tcf_proto_ops(&cls_mall_ops); +} + +static void __exit cls_mall_exit(void) +{ + unregister_tcf_proto_ops(&cls_mall_ops); +} + +module_init(cls_mall_init); +module_exit(cls_mall_exit); + +MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); +MODULE_DESCRIPTION("Match-all classifier"); +MODULE_LICENSE("GPL v2"); |