From: Oliver Hartkopp <socketcan@hartkopp.net>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Subject: Re: [RFC davem] revert: net: Make skb->skb_iif always track skb->dev
Date: Sun, 13 Jan 2013 12:01:53 +0100 [thread overview]
Message-ID: <50F29421.1090405@hartkopp.net> (raw)
In-Reply-To: <20130112.133630.257139657732337147.davem@davemloft.net>
On 12.01.2013 22:36, David Miller wrote:
> As per your problem with CAN, that's also rediculous. You have an SKB
> control block in skb->cb[] that you can put whatever values with
> whatever semantics you want.
>
> Use it.
I'm not writing a RFC to you, when i'm not sure having checked several options
before.
In the tx path already net/sched is using cb[] for it's purposes.
Adding the information somewhere at the end of cb[] to not interfere with
sched becomes tricky. See users of qdisc_cb_private_validate().
So the 'incoming interface index' could be stored safely in the tx path in
- skb->data
- skb_shared_info
- skb_iif
skb_iif was the obvious choice then. And the question why a seven year old
if-statement in net/core/dev.c has been removed must be allowed.
Networking is not only IP networking.
Oliver
next prev parent reply other threads:[~2013-01-13 11:01 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-12 13:48 [RFC davem] revert: net: Make skb->skb_iif always track skb->dev Oliver Hartkopp
2013-01-12 18:13 ` Jiri Pirko
2013-01-12 18:40 ` Oliver Hartkopp
2013-01-12 19:37 ` Jiri Pirko
2013-01-12 20:14 ` Oliver Hartkopp
2013-01-12 21:23 ` David Miller
2013-01-12 21:36 ` David Miller
2013-01-13 3:06 ` [PATCH net-next] pkt_sched: namespace aware ifb Eric Dumazet
2013-01-13 3:50 ` Benjamin LaHaise
2013-01-13 5:49 ` Eric Dumazet
2013-01-13 14:44 ` Jamal Hadi Salim
2013-01-13 16:41 ` Benjamin LaHaise
2013-01-13 16:57 ` Eric Dumazet
2013-01-13 17:25 ` Jamal Hadi Salim
2013-01-14 5:40 ` Eric Dumazet
2013-01-13 17:46 ` [PATCH net-next] ifb: dont hard code inet_net use Eric Dumazet
2013-01-14 13:13 ` Jamal Hadi Salim
2013-01-14 15:15 ` [PATCH net-next] pkt_sched: namespace aware act_mirred Benjamin LaHaise
2013-01-14 20:10 ` David Miller
2013-01-14 20:13 ` [PATCH net-next] ifb: dont hard code inet_net use David Miller
2013-01-13 14:59 ` [PATCH net-next] pkt_sched: namespace aware ifb Benjamin LaHaise
2013-01-13 16:35 ` Eric Dumazet
2013-01-13 11:01 ` Oliver Hartkopp [this message]
2013-01-13 13:20 ` [RFC davem] revert: net: Make skb->skb_iif always track skb->dev David Miller
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