netdev - RE: [PATCH net-next 02/12] tipc: Add "max

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B725E@saturn3.aculab.com>
Date:	Fri, 31 May 2013 10:25:34 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Erik Hugne" <erik.hugne@...csson.com>,
	"David Miller" <davem@...emloft.net>
Cc:	<paul.gortmaker@...driver.com>, <netdev@...r.kernel.org>,
	<jon.maloy@...csson.com>, <ying.xue@...driver.com>
Subject: RE: [PATCH net-next 02/12] tipc: Add "max_ports" configuration parameter

> > We never shrink the hash tables once we've grown them.  That's a
> > reasonable way to behave.
> 
> Very well.
> Currently, the refs/portID's are built up of a random part, and an index
> part. The index is obtained by masking against the table size.
> If the table is allowed to grow, we must remove the random part from the
> portID. Otherwise we would index out a nonexistant or wrong port
> from a received packet..

No - you just copy the entry into the correct location in the
new array.
One of the 'random' bits becomes an 'index' bit.

	David



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