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![Po Liu](/assets/img/avatar_default.png)
This patch adds a drop frames counter to tc flower offloading. Reporting h/w dropped frames is necessary for some actions. Some actions like police action and the coming introduced stream gate action would produce dropped frames which is necessary for user. Status update shows how many filtered packets increasing and how many dropped in those packets. v2: Changes - Update commit comments suggest by Jiri Pirko. Signed-off-by: Po Liu <Po.Liu@nxp.com> Reviewed-by: Simon Horman <simon.horman@netronome.com> Reviewed-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
443 lines
10 KiB
C
443 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/cls_matchll.c Match-all classifier
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*
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* Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/percpu.h>
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#include <net/sch_generic.h>
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#include <net/pkt_cls.h>
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struct cls_mall_head {
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struct tcf_exts exts;
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struct tcf_result res;
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u32 handle;
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u32 flags;
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unsigned int in_hw_count;
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struct tc_matchall_pcnt __percpu *pf;
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struct rcu_work rwork;
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bool deleting;
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};
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static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
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struct tcf_result *res)
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{
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struct cls_mall_head *head = rcu_dereference_bh(tp->root);
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if (unlikely(!head))
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return -1;
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if (tc_skip_sw(head->flags))
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return -1;
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*res = head->res;
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__this_cpu_inc(head->pf->rhit);
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return tcf_exts_exec(skb, &head->exts, res);
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}
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static int mall_init(struct tcf_proto *tp)
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{
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return 0;
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}
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static void __mall_destroy(struct cls_mall_head *head)
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{
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tcf_exts_destroy(&head->exts);
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tcf_exts_put_net(&head->exts);
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free_percpu(head->pf);
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kfree(head);
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}
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static void mall_destroy_work(struct work_struct *work)
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{
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struct cls_mall_head *head = container_of(to_rcu_work(work),
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struct cls_mall_head,
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rwork);
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rtnl_lock();
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__mall_destroy(head);
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rtnl_unlock();
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}
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static void mall_destroy_hw_filter(struct tcf_proto *tp,
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struct cls_mall_head *head,
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unsigned long cookie,
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struct netlink_ext_ack *extack)
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{
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struct tc_cls_matchall_offload cls_mall = {};
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struct tcf_block *block = tp->chain->block;
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tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
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cls_mall.command = TC_CLSMATCHALL_DESTROY;
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cls_mall.cookie = cookie;
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tc_setup_cb_destroy(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, false,
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&head->flags, &head->in_hw_count, true);
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}
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static int mall_replace_hw_filter(struct tcf_proto *tp,
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struct cls_mall_head *head,
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unsigned long cookie,
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struct netlink_ext_ack *extack)
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{
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struct tc_cls_matchall_offload cls_mall = {};
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struct tcf_block *block = tp->chain->block;
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bool skip_sw = tc_skip_sw(head->flags);
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int err;
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cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts));
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if (!cls_mall.rule)
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return -ENOMEM;
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tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
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cls_mall.command = TC_CLSMATCHALL_REPLACE;
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cls_mall.cookie = cookie;
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err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts);
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if (err) {
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kfree(cls_mall.rule);
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mall_destroy_hw_filter(tp, head, cookie, NULL);
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if (skip_sw)
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NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
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else
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err = 0;
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return err;
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}
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err = tc_setup_cb_add(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall,
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skip_sw, &head->flags, &head->in_hw_count, true);
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tc_cleanup_flow_action(&cls_mall.rule->action);
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kfree(cls_mall.rule);
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if (err) {
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mall_destroy_hw_filter(tp, head, cookie, NULL);
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return err;
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}
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if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW))
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return -EINVAL;
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return 0;
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}
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static void mall_destroy(struct tcf_proto *tp, bool rtnl_held,
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struct netlink_ext_ack *extack)
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{
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struct cls_mall_head *head = rtnl_dereference(tp->root);
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if (!head)
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return;
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tcf_unbind_filter(tp, &head->res);
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if (!tc_skip_hw(head->flags))
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mall_destroy_hw_filter(tp, head, (unsigned long) head, extack);
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if (tcf_exts_get_net(&head->exts))
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tcf_queue_work(&head->rwork, mall_destroy_work);
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else
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__mall_destroy(head);
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}
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static void *mall_get(struct tcf_proto *tp, u32 handle)
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{
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struct cls_mall_head *head = rtnl_dereference(tp->root);
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if (head && head->handle == handle)
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return head;
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return NULL;
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}
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static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
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[TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
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[TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
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[TCA_MATCHALL_FLAGS] = { .type = NLA_U32 },
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};
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static int mall_set_parms(struct net *net, struct tcf_proto *tp,
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struct cls_mall_head *head,
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unsigned long base, struct nlattr **tb,
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struct nlattr *est, bool ovr,
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struct netlink_ext_ack *extack)
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{
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int err;
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err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, true,
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extack);
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if (err < 0)
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return err;
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if (tb[TCA_MATCHALL_CLASSID]) {
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head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
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tcf_bind_filter(tp, &head->res, base);
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}
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return 0;
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}
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static int mall_change(struct net *net, struct sk_buff *in_skb,
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struct tcf_proto *tp, unsigned long base,
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u32 handle, struct nlattr **tca,
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void **arg, bool ovr, bool rtnl_held,
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struct netlink_ext_ack *extack)
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{
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struct cls_mall_head *head = rtnl_dereference(tp->root);
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struct nlattr *tb[TCA_MATCHALL_MAX + 1];
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struct cls_mall_head *new;
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u32 flags = 0;
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int err;
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if (!tca[TCA_OPTIONS])
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return -EINVAL;
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if (head)
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return -EEXIST;
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err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX,
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tca[TCA_OPTIONS], mall_policy, NULL);
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if (err < 0)
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return err;
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if (tb[TCA_MATCHALL_FLAGS]) {
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flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
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if (!tc_flags_valid(flags))
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return -EINVAL;
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}
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new = kzalloc(sizeof(*new), GFP_KERNEL);
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if (!new)
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return -ENOBUFS;
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err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0);
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if (err)
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goto err_exts_init;
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if (!handle)
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handle = 1;
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new->handle = handle;
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new->flags = flags;
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new->pf = alloc_percpu(struct tc_matchall_pcnt);
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if (!new->pf) {
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err = -ENOMEM;
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goto err_alloc_percpu;
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}
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err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr,
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extack);
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if (err)
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goto err_set_parms;
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if (!tc_skip_hw(new->flags)) {
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err = mall_replace_hw_filter(tp, new, (unsigned long)new,
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extack);
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if (err)
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goto err_replace_hw_filter;
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}
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if (!tc_in_hw(new->flags))
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new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
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*arg = head;
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rcu_assign_pointer(tp->root, new);
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return 0;
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err_replace_hw_filter:
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err_set_parms:
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free_percpu(new->pf);
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err_alloc_percpu:
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tcf_exts_destroy(&new->exts);
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err_exts_init:
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kfree(new);
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return err;
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}
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static int mall_delete(struct tcf_proto *tp, void *arg, bool *last,
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bool rtnl_held, struct netlink_ext_ack *extack)
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{
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struct cls_mall_head *head = rtnl_dereference(tp->root);
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head->deleting = true;
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*last = true;
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return 0;
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}
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static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg,
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bool rtnl_held)
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{
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struct cls_mall_head *head = rtnl_dereference(tp->root);
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if (arg->count < arg->skip)
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goto skip;
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if (!head || head->deleting)
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return;
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if (arg->fn(tp, head, arg) < 0)
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arg->stop = 1;
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skip:
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arg->count++;
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}
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static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
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void *cb_priv, struct netlink_ext_ack *extack)
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{
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struct cls_mall_head *head = rtnl_dereference(tp->root);
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struct tc_cls_matchall_offload cls_mall = {};
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struct tcf_block *block = tp->chain->block;
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int err;
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if (tc_skip_hw(head->flags))
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return 0;
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cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts));
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if (!cls_mall.rule)
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return -ENOMEM;
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tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
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cls_mall.command = add ?
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TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY;
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cls_mall.cookie = (unsigned long)head;
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err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts);
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if (err) {
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kfree(cls_mall.rule);
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if (add && tc_skip_sw(head->flags)) {
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NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
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return err;
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}
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return 0;
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}
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err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSMATCHALL,
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&cls_mall, cb_priv, &head->flags,
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&head->in_hw_count);
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tc_cleanup_flow_action(&cls_mall.rule->action);
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kfree(cls_mall.rule);
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if (err)
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return err;
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return 0;
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}
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static void mall_stats_hw_filter(struct tcf_proto *tp,
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struct cls_mall_head *head,
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unsigned long cookie)
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{
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struct tc_cls_matchall_offload cls_mall = {};
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struct tcf_block *block = tp->chain->block;
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tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL);
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cls_mall.command = TC_CLSMATCHALL_STATS;
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cls_mall.cookie = cookie;
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tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false, true);
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tcf_exts_stats_update(&head->exts, cls_mall.stats.bytes,
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cls_mall.stats.pkts, cls_mall.stats.drops,
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cls_mall.stats.lastused,
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cls_mall.stats.used_hw_stats,
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cls_mall.stats.used_hw_stats_valid);
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}
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static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
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struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
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{
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struct tc_matchall_pcnt gpf = {};
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struct cls_mall_head *head = fh;
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struct nlattr *nest;
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int cpu;
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if (!head)
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return skb->len;
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if (!tc_skip_hw(head->flags))
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mall_stats_hw_filter(tp, head, (unsigned long)head);
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t->tcm_handle = head->handle;
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nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
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if (!nest)
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goto nla_put_failure;
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if (head->res.classid &&
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nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
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goto nla_put_failure;
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if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags))
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goto nla_put_failure;
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for_each_possible_cpu(cpu) {
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struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu);
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gpf.rhit += pf->rhit;
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}
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if (nla_put_64bit(skb, TCA_MATCHALL_PCNT,
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sizeof(struct tc_matchall_pcnt),
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&gpf, TCA_MATCHALL_PAD))
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goto nla_put_failure;
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if (tcf_exts_dump(skb, &head->exts))
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goto nla_put_failure;
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nla_nest_end(skb, nest);
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if (tcf_exts_dump_stats(skb, &head->exts) < 0)
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goto nla_put_failure;
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return skb->len;
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nla_put_failure:
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nla_nest_cancel(skb, nest);
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return -1;
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}
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static void mall_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
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unsigned long base)
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{
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struct cls_mall_head *head = fh;
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if (head && head->res.classid == classid) {
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if (cl)
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__tcf_bind_filter(q, &head->res, base);
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else
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__tcf_unbind_filter(q, &head->res);
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}
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}
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static struct tcf_proto_ops cls_mall_ops __read_mostly = {
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.kind = "matchall",
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.classify = mall_classify,
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.init = mall_init,
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.destroy = mall_destroy,
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.get = mall_get,
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.change = mall_change,
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.delete = mall_delete,
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.walk = mall_walk,
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.reoffload = mall_reoffload,
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.dump = mall_dump,
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.bind_class = mall_bind_class,
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.owner = THIS_MODULE,
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};
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static int __init cls_mall_init(void)
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{
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return register_tcf_proto_ops(&cls_mall_ops);
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}
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static void __exit cls_mall_exit(void)
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{
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unregister_tcf_proto_ops(&cls_mall_ops);
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}
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module_init(cls_mall_init);
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module_exit(cls_mall_exit);
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MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
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MODULE_DESCRIPTION("Match-all classifier");
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MODULE_LICENSE("GPL v2");
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