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![Chris Mi](/assets/img/avatar_default.png)
Typically, each TC filter has its own action. All the actions of the same type are saved in its hash table. But the hash buckets are too small that it degrades to a list. And the performance is greatly affected. For example, it takes about 0m11.914s to insert 64K rules. If we convert the hash table to IDR, it only takes about 0m1.500s. The improvement is huge. But please note that the test result is based on previous patch that cls_flower uses IDR. Signed-off-by: Chris Mi <chrism@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
298 lines
7.4 KiB
C
298 lines
7.4 KiB
C
/*
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* net/sched/act_skbmod.c skb data modifier
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*
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* Copyright (c) 2016 Jamal Hadi Salim <jhs@mojatatu.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_skbmod.h>
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#include <net/tc_act/tc_skbmod.h>
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static unsigned int skbmod_net_id;
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static struct tc_action_ops act_skbmod_ops;
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#define MAX_EDIT_LEN ETH_HLEN
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static int tcf_skbmod_run(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_skbmod *d = to_skbmod(a);
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int action;
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struct tcf_skbmod_params *p;
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u64 flags;
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int err;
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tcf_lastuse_update(&d->tcf_tm);
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bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);
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/* XXX: if you are going to edit more fields beyond ethernet header
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* (example when you add IP header replacement or vlan swap)
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* then MAX_EDIT_LEN needs to change appropriately
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*/
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err = skb_ensure_writable(skb, MAX_EDIT_LEN);
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if (unlikely(err)) { /* best policy is to drop on the floor */
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qstats_overlimit_inc(this_cpu_ptr(d->common.cpu_qstats));
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return TC_ACT_SHOT;
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}
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rcu_read_lock();
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action = READ_ONCE(d->tcf_action);
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if (unlikely(action == TC_ACT_SHOT)) {
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qstats_overlimit_inc(this_cpu_ptr(d->common.cpu_qstats));
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rcu_read_unlock();
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return action;
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}
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p = rcu_dereference(d->skbmod_p);
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flags = p->flags;
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if (flags & SKBMOD_F_DMAC)
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ether_addr_copy(eth_hdr(skb)->h_dest, p->eth_dst);
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if (flags & SKBMOD_F_SMAC)
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ether_addr_copy(eth_hdr(skb)->h_source, p->eth_src);
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if (flags & SKBMOD_F_ETYPE)
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eth_hdr(skb)->h_proto = p->eth_type;
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rcu_read_unlock();
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if (flags & SKBMOD_F_SWAPMAC) {
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u16 tmpaddr[ETH_ALEN / 2]; /* ether_addr_copy() requirement */
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/*XXX: I am sure we can come up with more efficient swapping*/
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ether_addr_copy((u8 *)tmpaddr, eth_hdr(skb)->h_dest);
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ether_addr_copy(eth_hdr(skb)->h_dest, eth_hdr(skb)->h_source);
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ether_addr_copy(eth_hdr(skb)->h_source, (u8 *)tmpaddr);
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}
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return action;
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}
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static const struct nla_policy skbmod_policy[TCA_SKBMOD_MAX + 1] = {
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[TCA_SKBMOD_PARMS] = { .len = sizeof(struct tc_skbmod) },
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[TCA_SKBMOD_DMAC] = { .len = ETH_ALEN },
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[TCA_SKBMOD_SMAC] = { .len = ETH_ALEN },
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[TCA_SKBMOD_ETYPE] = { .type = NLA_U16 },
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};
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static int tcf_skbmod_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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int ovr, int bind)
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{
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struct tc_action_net *tn = net_generic(net, skbmod_net_id);
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struct nlattr *tb[TCA_SKBMOD_MAX + 1];
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struct tcf_skbmod_params *p, *p_old;
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struct tc_skbmod *parm;
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struct tcf_skbmod *d;
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bool exists = false;
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u8 *daddr = NULL;
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u8 *saddr = NULL;
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u16 eth_type = 0;
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u32 lflags = 0;
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int ret = 0, err;
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if (!nla)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_SKBMOD_MAX, nla, skbmod_policy, NULL);
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if (err < 0)
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return err;
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if (!tb[TCA_SKBMOD_PARMS])
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return -EINVAL;
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if (tb[TCA_SKBMOD_DMAC]) {
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daddr = nla_data(tb[TCA_SKBMOD_DMAC]);
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lflags |= SKBMOD_F_DMAC;
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}
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if (tb[TCA_SKBMOD_SMAC]) {
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saddr = nla_data(tb[TCA_SKBMOD_SMAC]);
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lflags |= SKBMOD_F_SMAC;
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}
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if (tb[TCA_SKBMOD_ETYPE]) {
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eth_type = nla_get_u16(tb[TCA_SKBMOD_ETYPE]);
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lflags |= SKBMOD_F_ETYPE;
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}
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parm = nla_data(tb[TCA_SKBMOD_PARMS]);
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if (parm->flags & SKBMOD_F_SWAPMAC)
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lflags = SKBMOD_F_SWAPMAC;
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exists = tcf_idr_check(tn, parm->index, a, bind);
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if (exists && bind)
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return 0;
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if (!lflags)
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return -EINVAL;
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if (!exists) {
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_skbmod_ops, bind, true);
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if (ret)
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return ret;
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ret = ACT_P_CREATED;
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} else {
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tcf_idr_release(*a, bind);
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if (!ovr)
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return -EEXIST;
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}
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d = to_skbmod(*a);
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ASSERT_RTNL();
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p = kzalloc(sizeof(struct tcf_skbmod_params), GFP_KERNEL);
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if (unlikely(!p)) {
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if (ovr)
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tcf_idr_release(*a, bind);
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return -ENOMEM;
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}
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p->flags = lflags;
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d->tcf_action = parm->action;
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p_old = rtnl_dereference(d->skbmod_p);
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if (ovr)
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spin_lock_bh(&d->tcf_lock);
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if (lflags & SKBMOD_F_DMAC)
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ether_addr_copy(p->eth_dst, daddr);
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if (lflags & SKBMOD_F_SMAC)
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ether_addr_copy(p->eth_src, saddr);
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if (lflags & SKBMOD_F_ETYPE)
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p->eth_type = htons(eth_type);
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rcu_assign_pointer(d->skbmod_p, p);
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if (ovr)
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spin_unlock_bh(&d->tcf_lock);
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if (p_old)
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kfree_rcu(p_old, rcu);
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if (ret == ACT_P_CREATED)
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tcf_idr_insert(tn, *a);
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return ret;
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}
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static void tcf_skbmod_cleanup(struct tc_action *a, int bind)
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{
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struct tcf_skbmod *d = to_skbmod(a);
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struct tcf_skbmod_params *p;
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p = rcu_dereference_protected(d->skbmod_p, 1);
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kfree_rcu(p, rcu);
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}
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static int tcf_skbmod_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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{
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struct tcf_skbmod *d = to_skbmod(a);
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_skbmod_params *p = rtnl_dereference(d->skbmod_p);
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struct tc_skbmod opt = {
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.index = d->tcf_index,
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.refcnt = d->tcf_refcnt - ref,
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.bindcnt = d->tcf_bindcnt - bind,
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.action = d->tcf_action,
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};
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struct tcf_t t;
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opt.flags = p->flags;
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if (nla_put(skb, TCA_SKBMOD_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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if ((p->flags & SKBMOD_F_DMAC) &&
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nla_put(skb, TCA_SKBMOD_DMAC, ETH_ALEN, p->eth_dst))
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goto nla_put_failure;
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if ((p->flags & SKBMOD_F_SMAC) &&
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nla_put(skb, TCA_SKBMOD_SMAC, ETH_ALEN, p->eth_src))
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goto nla_put_failure;
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if ((p->flags & SKBMOD_F_ETYPE) &&
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nla_put_u16(skb, TCA_SKBMOD_ETYPE, ntohs(p->eth_type)))
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goto nla_put_failure;
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tcf_tm_dump(&t, &d->tcf_tm);
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if (nla_put_64bit(skb, TCA_SKBMOD_TM, sizeof(t), &t, TCA_SKBMOD_PAD))
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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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nlmsg_trim(skb, b);
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return -1;
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}
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static int tcf_skbmod_walker(struct net *net, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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const struct tc_action_ops *ops)
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{
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struct tc_action_net *tn = net_generic(net, skbmod_net_id);
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return tcf_generic_walker(tn, skb, cb, type, ops);
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}
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static int tcf_skbmod_search(struct net *net, struct tc_action **a, u32 index)
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{
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struct tc_action_net *tn = net_generic(net, skbmod_net_id);
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return tcf_idr_search(tn, a, index);
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}
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static struct tc_action_ops act_skbmod_ops = {
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.kind = "skbmod",
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.type = TCA_ACT_SKBMOD,
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.owner = THIS_MODULE,
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.act = tcf_skbmod_run,
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.dump = tcf_skbmod_dump,
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.init = tcf_skbmod_init,
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.cleanup = tcf_skbmod_cleanup,
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.walk = tcf_skbmod_walker,
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.lookup = tcf_skbmod_search,
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.size = sizeof(struct tcf_skbmod),
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};
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static __net_init int skbmod_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, skbmod_net_id);
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return tc_action_net_init(tn, &act_skbmod_ops);
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}
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static void __net_exit skbmod_exit_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, skbmod_net_id);
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tc_action_net_exit(tn);
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}
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static struct pernet_operations skbmod_net_ops = {
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.init = skbmod_init_net,
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.exit = skbmod_exit_net,
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.id = &skbmod_net_id,
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.size = sizeof(struct tc_action_net),
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};
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MODULE_AUTHOR("Jamal Hadi Salim, <jhs@mojatatu.com>");
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MODULE_DESCRIPTION("SKB data mod-ing");
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MODULE_LICENSE("GPL");
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static int __init skbmod_init_module(void)
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{
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return tcf_register_action(&act_skbmod_ops, &skbmod_net_ops);
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}
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static void __exit skbmod_cleanup_module(void)
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{
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tcf_unregister_action(&act_skbmod_ops, &skbmod_net_ops);
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}
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module_init(skbmod_init_module);
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module_exit(skbmod_cleanup_module);
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