xref: /openbmc/linux/net/sched/act_meta_skbprio.c (revision 2874c5fd)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * net/sched/act_meta_prio.c IFE skb->priority metadata module
4  *
5  * copyright Jamal Hadi Salim (2015)
6 */
7 
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/string.h>
11 #include <linux/errno.h>
12 #include <linux/skbuff.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <net/netlink.h>
17 #include <net/pkt_sched.h>
18 #include <uapi/linux/tc_act/tc_ife.h>
19 #include <net/tc_act/tc_ife.h>
20 
skbprio_check(struct sk_buff * skb,struct tcf_meta_info * e)21 static int skbprio_check(struct sk_buff *skb, struct tcf_meta_info *e)
22 {
23 	return ife_check_meta_u32(skb->priority, e);
24 }
25 
skbprio_encode(struct sk_buff * skb,void * skbdata,struct tcf_meta_info * e)26 static int skbprio_encode(struct sk_buff *skb, void *skbdata,
27 			  struct tcf_meta_info *e)
28 {
29 	u32 ifeprio = skb->priority; /* avoid having to cast skb->priority*/
30 
31 	return ife_encode_meta_u32(ifeprio, skbdata, e);
32 }
33 
skbprio_decode(struct sk_buff * skb,void * data,u16 len)34 static int skbprio_decode(struct sk_buff *skb, void *data, u16 len)
35 {
36 	u32 ifeprio = *(u32 *)data;
37 
38 	skb->priority = ntohl(ifeprio);
39 	return 0;
40 }
41 
42 static struct tcf_meta_ops ife_prio_ops = {
43 	.metaid = IFE_META_PRIO,
44 	.metatype = NLA_U32,
45 	.name = "skbprio",
46 	.synopsis = "skb prio metadata",
47 	.check_presence = skbprio_check,
48 	.encode = skbprio_encode,
49 	.decode = skbprio_decode,
50 	.get = ife_get_meta_u32,
51 	.alloc = ife_alloc_meta_u32,
52 	.owner = THIS_MODULE,
53 };
54 
ifeprio_init_module(void)55 static int __init ifeprio_init_module(void)
56 {
57 	return register_ife_op(&ife_prio_ops);
58 }
59 
ifeprio_cleanup_module(void)60 static void __exit ifeprio_cleanup_module(void)
61 {
62 	unregister_ife_op(&ife_prio_ops);
63 }
64 
65 module_init(ifeprio_init_module);
66 module_exit(ifeprio_cleanup_module);
67 
68 MODULE_AUTHOR("Jamal Hadi Salim(2015)");
69 MODULE_DESCRIPTION("Inter-FE skb prio metadata action");
70 MODULE_LICENSE("GPL");
71 MODULE_ALIAS_IFE_META("skbprio");
72