From: Daniel Borkmann <daniel@iogearbox•net>
To: Jamal Hadi Salim <jhs@mojatatu•com>, davem@davemloft•net
Cc: netdev@vger•kernel.org, xiyou.wangcong@gmail•com,
alexei.starovoitov@gmail•com
Subject: Re: [net-next PATCH 4/5] Support to encoding decoding skb hashid on IFE action
Date: Mon, 22 Feb 2016 17:56:53 +0100 [thread overview]
Message-ID: <56CB3DD5.8090906@iogearbox.net> (raw)
In-Reply-To: <1456147304-13355-5-git-send-email-jhs@emojatatu.com>
On 02/22/2016 02:21 PM, Jamal Hadi Salim wrote:
[...]
> diff --git a/net/sched/act_meta_skbhash.c b/net/sched/act_meta_skbhash.c
> new file mode 100644
> index 0000000..c3140ea
> --- /dev/null
> +++ b/net/sched/act_meta_skbhash.c
> @@ -0,0 +1,87 @@
> +/*
> + * net/sched/act_meta_skbhash.c IFE skb->hash metadata module
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version
> + * 2 of the License, or (at your option) any later version.
> + *
> + * copyright Jamal Hadi Salim (2015)
> + *
> +*/
> +
> +#include <linux/types.h>
> +#include <linux/kernel.h>
> +#include <linux/string.h>
> +#include <linux/errno.h>
> +#include <linux/skbuff.h>
> +#include <linux/rtnetlink.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <net/netlink.h>
> +#include <net/pkt_sched.h>
> +#include <uapi/linux/tc_act/tc_ife.h>
> +#include <net/tc_act/tc_ife.h>
> +
> +static int skbhash_check(struct sk_buff *skb, struct tcf_meta_info *e)
> +{
> + u32 skbhash = skb->hash;
> +
> + if (e->metaval) {
> + skbhash = *(u32 *)e->metaval;
> + }
> + if (!skbhash)
> + return 0;
> +
> + return 8;
What's magic number 8?
> +}
> +
> +static int skbhash_encode(struct sk_buff *skb, void *skbdata,
> + struct tcf_meta_info *e)
> +{
> + u32 skbhash = skb->hash;
> +
> + return encode_meta_u32(skbhash, skbdata, e);
> +}
> +
> +static int skbhash_decode(struct sk_buff *skb, void *data, u16 len)
> +{
> + u32 skbhash = *(u32 *) data;
> +
> + skb->hash = ntohl(skbhash);
Depending on your scenario/use case, the next skb_get_hash() call
could overwrite what you've transferred and set here.
> + return 0;
> +}
> +
> +static struct tcf_meta_ops ife_skbhash_ops = {
> + .metaid = IFE_META_HASHID,
> + .metatype = NLA_U32,
> + .name = "skbhash",
> + .synopsis = "skb hash metadata",
MODULE_DESCRIPTION()?
> + .check_presence = skbhash_check,
> + .encode = skbhash_encode,
> + .decode = skbhash_decode,
> + .get = get_meta_u32,
> + .alloc = alloc_meta_u32,
> + .owner = THIS_MODULE,
> +};
> +
> +static int __init ifeskbhash_init_module(void)
> +{
> + pr_info("Loaded IFE skbhash\n");
Leftover pr_info()?
> + return register_ife_op(&ife_skbhash_ops);
> +}
> +
> +static void __exit ifeskbhash_cleanup_module(void)
> +{
> + pr_info("Unloaded IFE skb hash\n");
Ditto?
> + unregister_ife_op(&ife_skbhash_ops);
> +}
> +
> +module_init(ifeskbhash_init_module);
> +module_exit(ifeskbhash_cleanup_module);
> +
> +MODULE_AUTHOR("Jamal Hadi Salim(2015)");
> +MODULE_DESCRIPTION("Inter-FE skb hash meta action");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS_IFE_META(IFE_META_HASHID);
>
next prev parent reply other threads:[~2016-02-22 16:56 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-22 13:21 [net-next PATCH 0/5] net_sched: Add support for IFE action Jamal Hadi Salim
2016-02-22 13:21 ` [net-next PATCH 1/5] introduce " Jamal Hadi Salim
2016-02-22 13:21 ` [net-next PATCH 2/5] Support to encoding decoding skb mark on " Jamal Hadi Salim
2016-02-22 13:21 ` [net-next PATCH 3/5] Support to encoding decoding skb prio " Jamal Hadi Salim
2016-02-22 17:01 ` Daniel Borkmann
2016-02-22 13:21 ` [net-next PATCH 4/5] Support to encoding decoding skb hashid " Jamal Hadi Salim
2016-02-22 16:56 ` Daniel Borkmann [this message]
2016-02-22 13:21 ` [net-next PATCH 5/5] Support to encoding decoding skb queue map " Jamal Hadi Salim
2016-02-22 16:59 ` Daniel Borkmann
2016-02-22 21:03 ` John Fastabend
2016-02-23 12:17 ` Jamal Hadi Salim
2016-02-23 19:33 ` John Fastabend
2016-02-22 16:47 ` [net-next PATCH 0/5] net_sched: Add support for " Daniel Borkmann
2016-02-23 12:09 ` Jamal Hadi Salim
2016-02-23 13:20 ` Daniel Borkmann
2016-02-23 14:28 ` Jamal Hadi Salim
2016-02-23 15:34 ` Daniel Borkmann
2016-02-24 12:49 ` Jamal Hadi Salim
2016-02-24 17:48 ` Daniel Borkmann
2016-02-25 12:23 ` Jamal Hadi Salim
2016-02-25 21:34 ` Daniel Borkmann
2016-02-25 22:40 ` Jamal Hadi Salim
2016-02-26 0:03 ` Daniel Borkmann
2016-02-24 17:58 ` Daniel Borkmann
2016-02-25 12:35 ` Jamal Hadi Salim
2016-02-23 7:00 ` Cong Wang
2016-02-23 12:18 ` Jamal Hadi Salim
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