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Message-ID: <1319036228.2829.14.camel@bwh-desktop> Date: Wed, 19 Oct 2011 15:57:08 +0100 From: Ben Hutchings <bhutchings@...arflare.com> To: Stephen Hemminger <shemminger@...tta.com> Cc: Yevgeny Petrilin <yevgenyp@...lanox.co.il>, Eric Dumazet <eric.dumazet@...il.com>, "davem@...emloft.net" <davem@...emloft.net>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: [PATCH 6/7] mlx4_en: Adding rxhash support On Tue, 2011-10-18 at 20:35 +0100, Ben Hutchings wrote: [...] > There was also a proposal a while back that we should try to make the > hash symmetric w.r.t. RX and TX addresses, so that both directions of a > flow through a router/bridge are aligned. I think this was to be done > by repeating a 16-bit pattern across the key. Not sure whether that's > worthwhile. That also makes it relatively cheap to calculate in software, which DragonflyBSD does: http://gitweb.dragonflybsd.org/dragonfly.git/blob/master:/sys/net/toeplitz.c http://gitweb.dragonflybsd.org/dragonfly.git/blob/master:/sys/net/toeplitz2.h (the latter file appears to assume that in_addr_t/in_port_t are byte- swapped i.e. the host is little-endian). Ben. -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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