pkt_action: add new action skbedit
This new action will have the ability to change the priority and/or queue_mapping fields on an sk_buff. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck
committed by
David S. Miller
David S. Miller
parent
92651940ab
commit
ca9b0e27e0
203
net/sched/act_skbedit.c
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203
net/sched/act_skbedit.c
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/*
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* Copyright (c) 2008, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Author: Alexander Duyck <alexander.h.duyck@intel.com>
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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_skbedit.h>
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#include <net/tc_act/tc_skbedit.h>
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#define SKBEDIT_TAB_MASK 15
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static struct tcf_common *tcf_skbedit_ht[SKBEDIT_TAB_MASK + 1];
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static u32 skbedit_idx_gen;
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static DEFINE_RWLOCK(skbedit_lock);
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static struct tcf_hashinfo skbedit_hash_info = {
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.htab = tcf_skbedit_ht,
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.hmask = SKBEDIT_TAB_MASK,
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.lock = &skbedit_lock,
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};
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static int tcf_skbedit(struct sk_buff *skb, struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_skbedit *d = a->priv;
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spin_lock(&d->tcf_lock);
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d->tcf_tm.lastuse = jiffies;
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d->tcf_bstats.bytes += qdisc_pkt_len(skb);
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d->tcf_bstats.packets++;
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if (d->flags & SKBEDIT_F_PRIORITY)
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skb->priority = d->priority;
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if (d->flags & SKBEDIT_F_QUEUE_MAPPING &&
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skb->dev->real_num_tx_queues > d->queue_mapping)
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skb_set_queue_mapping(skb, d->queue_mapping);
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spin_unlock(&d->tcf_lock);
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return d->tcf_action;
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}
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static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
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[TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
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[TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
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[TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
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};
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static int tcf_skbedit_init(struct nlattr *nla, struct nlattr *est,
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struct tc_action *a, int ovr, int bind)
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{
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struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
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struct tc_skbedit *parm;
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struct tcf_skbedit *d;
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struct tcf_common *pc;
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u32 flags = 0, *priority = NULL;
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u16 *queue_mapping = NULL;
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int ret = 0, err;
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if (nla == NULL)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy);
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if (err < 0)
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return err;
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if (tb[TCA_SKBEDIT_PARMS] == NULL)
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return -EINVAL;
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if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
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flags |= SKBEDIT_F_PRIORITY;
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priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
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}
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if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
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flags |= SKBEDIT_F_QUEUE_MAPPING;
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queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
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}
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if (!flags)
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return -EINVAL;
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parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
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pc = tcf_hash_check(parm->index, a, bind, &skbedit_hash_info);
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if (!pc) {
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pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
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&skbedit_idx_gen, &skbedit_hash_info);
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if (unlikely(!pc))
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return -ENOMEM;
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d = to_skbedit(pc);
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ret = ACT_P_CREATED;
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} else {
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d = to_skbedit(pc);
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if (!ovr) {
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tcf_hash_release(pc, bind, &skbedit_hash_info);
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return -EEXIST;
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}
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}
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spin_lock_bh(&d->tcf_lock);
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d->flags = flags;
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if (flags & SKBEDIT_F_PRIORITY)
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d->priority = *priority;
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if (flags & SKBEDIT_F_QUEUE_MAPPING)
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d->queue_mapping = *queue_mapping;
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d->tcf_action = parm->action;
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spin_unlock_bh(&d->tcf_lock);
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if (ret == ACT_P_CREATED)
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tcf_hash_insert(pc, &skbedit_hash_info);
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return ret;
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}
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static inline int tcf_skbedit_cleanup(struct tc_action *a, int bind)
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{
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struct tcf_skbedit *d = a->priv;
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if (d)
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return tcf_hash_release(&d->common, bind, &skbedit_hash_info);
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return 0;
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}
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static inline int tcf_skbedit_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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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_skbedit *d = a->priv;
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struct tc_skbedit opt;
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struct tcf_t t;
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opt.index = d->tcf_index;
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opt.refcnt = d->tcf_refcnt - ref;
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opt.bindcnt = d->tcf_bindcnt - bind;
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opt.action = d->tcf_action;
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NLA_PUT(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt);
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if (d->flags & SKBEDIT_F_PRIORITY)
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NLA_PUT(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority),
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&d->priority);
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if (d->flags & SKBEDIT_F_QUEUE_MAPPING)
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NLA_PUT(skb, TCA_SKBEDIT_QUEUE_MAPPING,
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sizeof(d->queue_mapping), &d->queue_mapping);
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t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
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t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
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t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
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NLA_PUT(skb, TCA_SKBEDIT_TM, sizeof(t), &t);
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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 struct tc_action_ops act_skbedit_ops = {
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.kind = "skbedit",
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.hinfo = &skbedit_hash_info,
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.type = TCA_ACT_SKBEDIT,
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.capab = TCA_CAP_NONE,
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.owner = THIS_MODULE,
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.act = tcf_skbedit,
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.dump = tcf_skbedit_dump,
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.cleanup = tcf_skbedit_cleanup,
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.init = tcf_skbedit_init,
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.walk = tcf_generic_walker,
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};
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MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
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MODULE_DESCRIPTION("SKB Editing");
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MODULE_LICENSE("GPL");
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static int __init skbedit_init_module(void)
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{
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return tcf_register_action(&act_skbedit_ops);
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}
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static void __exit skbedit_cleanup_module(void)
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{
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tcf_unregister_action(&act_skbedit_ops);
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}
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module_init(skbedit_init_module);
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module_exit(skbedit_cleanup_module);
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