netdev - Re: [PATCH net v2 1/1] tipc: move fragment importance field to new header position

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Date:	Wed, 14 Oct 2015 19:11:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jon.maloy@...csson.com
Cc:	netdev@...r.kernel.org, paul.gortmaker@...driver.com,
	parthasarathy.xx.bhuvaragan@...csson.com,
	richard.alpe@...csson.com, ying.xue@...driver.com,
	maloy@...jonn.com, tipc-discussion@...ts.sourceforge.net
Subject: Re: [PATCH net v2 1/1] tipc: move fragment importance field to new
 header position

From: Jon Maloy <jon.maloy@...csson.com>
Date: Wed, 14 Oct 2015 09:23:18 -0400

> In commit e3eea1eb47a ("tipc: clean up handling of message priorities")
> we introduced a field in the packet header for keeping track of the
> priority of fragments, since this value is not present in the specified
> protocol header. Since the value so far only is used at the transmitting
> end of the link, we have not yet officially defined it as part of the
> protocol.
> 
> Unfortunately, the field we use for keeping this value, bits 13-15 in
> in word 5, has turned out to be a poor choice; it is already used by the
> broadcast protocol for carrying the 'network id' field of the sending
> node. Since packet fragments also need to be transported across the
> broadcast protocol, the risk of conflict is obvious, and we see this
> happen when we use network identities larger than 2^13-1. This has
> escaped our testing because we have so far only been using small network
> id values.
> 
> We now move this field to bits 0-2 in word 9, a field that is guaranteed
> to be unused by all involved protocols.
> 
> Fixes: e3eea1eb47a ("tipc: clean up handling of message priorities")
> Signed-off-by: Jon Maloy <jon.maloy@...csson.com>
> Acked-by: Ying Xue <ying.xue@...driver.com>

Applied and queued up for -stable, thanks.
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