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>
diff --git a/net/sched/act_skbedit.c b/net/sched/act_skbedit.c
new file mode 100644
index 0000000..fe9777e
--- /dev/null
+++ b/net/sched/act_skbedit.c
@@ -0,0 +1,203 @@
+/*
+ * Copyright (c) 2008, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Author: Alexander Duyck <alexander.h.duyck@intel.com>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+
+#include <linux/tc_act/tc_skbedit.h>
+#include <net/tc_act/tc_skbedit.h>
+
+#define SKBEDIT_TAB_MASK 15
+static struct tcf_common *tcf_skbedit_ht[SKBEDIT_TAB_MASK + 1];
+static u32 skbedit_idx_gen;
+static DEFINE_RWLOCK(skbedit_lock);
+
+static struct tcf_hashinfo skbedit_hash_info = {
+ .htab = tcf_skbedit_ht,
+ .hmask = SKBEDIT_TAB_MASK,
+ .lock = &skbedit_lock,
+};
+
+static int tcf_skbedit(struct sk_buff *skb, struct tc_action *a,
+ struct tcf_result *res)
+{
+ struct tcf_skbedit *d = a->priv;
+
+ spin_lock(&d->tcf_lock);
+ d->tcf_tm.lastuse = jiffies;
+ d->tcf_bstats.bytes += qdisc_pkt_len(skb);
+ d->tcf_bstats.packets++;
+
+ if (d->flags & SKBEDIT_F_PRIORITY)
+ skb->priority = d->priority;
+ if (d->flags & SKBEDIT_F_QUEUE_MAPPING &&
+ skb->dev->real_num_tx_queues > d->queue_mapping)
+ skb_set_queue_mapping(skb, d->queue_mapping);
+
+ spin_unlock(&d->tcf_lock);
+ return d->tcf_action;
+}
+
+static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
+ [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) },
+ [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) },
+ [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) },
+};
+
+static int tcf_skbedit_init(struct nlattr *nla, struct nlattr *est,
+ struct tc_action *a, int ovr, int bind)
+{
+ struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
+ struct tc_skbedit *parm;
+ struct tcf_skbedit *d;
+ struct tcf_common *pc;
+ u32 flags = 0, *priority = NULL;
+ u16 *queue_mapping = NULL;
+ int ret = 0, err;
+
+ if (nla == NULL)
+ return -EINVAL;
+
+ err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_SKBEDIT_PARMS] == NULL)
+ return -EINVAL;
+
+ if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
+ flags |= SKBEDIT_F_PRIORITY;
+ priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
+ }
+
+ if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
+ flags |= SKBEDIT_F_QUEUE_MAPPING;
+ queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
+ }
+ if (!flags)
+ return -EINVAL;
+
+ parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
+
+ pc = tcf_hash_check(parm->index, a, bind, &skbedit_hash_info);
+ if (!pc) {
+ pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind,
+ &skbedit_idx_gen, &skbedit_hash_info);
+ if (unlikely(!pc))
+ return -ENOMEM;
+
+ d = to_skbedit(pc);
+ ret = ACT_P_CREATED;
+ } else {
+ d = to_skbedit(pc);
+ if (!ovr) {
+ tcf_hash_release(pc, bind, &skbedit_hash_info);
+ return -EEXIST;
+ }
+ }
+
+ spin_lock_bh(&d->tcf_lock);
+
+ d->flags = flags;
+ if (flags & SKBEDIT_F_PRIORITY)
+ d->priority = *priority;
+ if (flags & SKBEDIT_F_QUEUE_MAPPING)
+ d->queue_mapping = *queue_mapping;
+ d->tcf_action = parm->action;
+
+ spin_unlock_bh(&d->tcf_lock);
+
+ if (ret == ACT_P_CREATED)
+ tcf_hash_insert(pc, &skbedit_hash_info);
+ return ret;
+}
+
+static inline int tcf_skbedit_cleanup(struct tc_action *a, int bind)
+{
+ struct tcf_skbedit *d = a->priv;
+
+ if (d)
+ return tcf_hash_release(&d->common, bind, &skbedit_hash_info);
+ return 0;
+}
+
+static inline int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
+ int bind, int ref)
+{
+ unsigned char *b = skb_tail_pointer(skb);
+ struct tcf_skbedit *d = a->priv;
+ struct tc_skbedit opt;
+ struct tcf_t t;
+
+ opt.index = d->tcf_index;
+ opt.refcnt = d->tcf_refcnt - ref;
+ opt.bindcnt = d->tcf_bindcnt - bind;
+ opt.action = d->tcf_action;
+ NLA_PUT(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt);
+ if (d->flags & SKBEDIT_F_PRIORITY)
+ NLA_PUT(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority),
+ &d->priority);
+ if (d->flags & SKBEDIT_F_QUEUE_MAPPING)
+ NLA_PUT(skb, TCA_SKBEDIT_QUEUE_MAPPING,
+ sizeof(d->queue_mapping), &d->queue_mapping);
+ t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
+ t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
+ t.expires = jiffies_to_clock_t(d->tcf_tm.expires);
+ NLA_PUT(skb, TCA_SKBEDIT_TM, sizeof(t), &t);
+ return skb->len;
+
+nla_put_failure:
+ nlmsg_trim(skb, b);
+ return -1;
+}
+
+static struct tc_action_ops act_skbedit_ops = {
+ .kind = "skbedit",
+ .hinfo = &skbedit_hash_info,
+ .type = TCA_ACT_SKBEDIT,
+ .capab = TCA_CAP_NONE,
+ .owner = THIS_MODULE,
+ .act = tcf_skbedit,
+ .dump = tcf_skbedit_dump,
+ .cleanup = tcf_skbedit_cleanup,
+ .init = tcf_skbedit_init,
+ .walk = tcf_generic_walker,
+};
+
+MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
+MODULE_DESCRIPTION("SKB Editing");
+MODULE_LICENSE("GPL");
+
+static int __init skbedit_init_module(void)
+{
+ return tcf_register_action(&act_skbedit_ops);
+}
+
+static void __exit skbedit_cleanup_module(void)
+{
+ tcf_unregister_action(&act_skbedit_ops);
+}
+
+module_init(skbedit_init_module);
+module_exit(skbedit_cleanup_module);
