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-rw-r--r--net/sched/cls_matchall.c443
1 files changed, 443 insertions, 0 deletions
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
new file mode 100644
index 000000000..cafb84480
--- /dev/null
+++ b/net/sched/cls_matchall.c
@@ -0,0 +1,443 @@
+// 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_flow_action(&cls_mall.rule->action, &head->exts);
+ if (err) {
+ kfree(cls_mall.rule);
+ mall_destroy_hw_filter(tp, head, cookie, NULL);
+ if (skip_sw)
+ NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
+ else
+ err = 0;
+
+ return err;
+ }
+
+ err = tc_setup_cb_add(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall,
+ skip_sw, &head->flags, &head->in_hw_count, true);
+ tc_cleanup_flow_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_set_parms(struct net *net, struct tcf_proto *tp,
+ struct cls_mall_head *head,
+ unsigned long base, struct nlattr **tb,
+ struct nlattr *est, bool ovr,
+ struct netlink_ext_ack *extack)
+{
+ int err;
+
+ err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, true,
+ extack);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_MATCHALL_CLASSID]) {
+ head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
+ tcf_bind_filter(tp, &head->res, base);
+ }
+ return 0;
+}
+
+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, bool ovr, bool rtnl_held,
+ struct netlink_ext_ack *extack)
+{
+ struct cls_mall_head *head = rtnl_dereference(tp->root);
+ struct nlattr *tb[TCA_MATCHALL_MAX + 1];
+ struct cls_mall_head *new;
+ u32 flags = 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]) {
+ flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
+ if (!tc_flags_valid(flags))
+ 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 = flags;
+ new->pf = alloc_percpu(struct tc_matchall_pcnt);
+ if (!new->pf) {
+ err = -ENOMEM;
+ goto err_alloc_percpu;
+ }
+
+ err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr,
+ extack);
+ if (err)
+ goto err_set_parms;
+
+ 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:
+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_flow_action(&cls_mall.rule->action, &head->exts);
+ if (err) {
+ kfree(cls_mall.rule);
+ if (add && tc_skip_sw(head->flags)) {
+ NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
+ return err;
+ }
+ return 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_flow_action(&cls_mall.rule->action);
+ kfree(cls_mall.rule);
+
+ if (err)
+ return err;
+
+ return 0;
+}
+
+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_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;
+
+ if (head && head->res.classid == classid) {
+ if (cl)
+ __tcf_bind_filter(q, &head->res, base);
+ else
+ __tcf_unbind_filter(q, &head->res);
+ }
+}
+
+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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 12:15:29 +0000