netdev - Re: [PATCH] Software receive packet steering

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Message-ID: <20090408160842.6c2b1983@s6510>
Date:	Wed, 8 Apr 2009 16:08:42 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: [PATCH] Software receive packet steering

On Wed, 8 Apr 2009 15:48:12 -0700
Tom Herbert <therbert@...gle.com> wrote:

> 	if (skb->protocol == __constant_htons(ETH_P_IP)) {
> +		struct iphdr *iph = (struct iphdr *)skb->data;
> +		__be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
> +
> +		hash = 0;
> +		if (!(iph->frag_off &
> +		      __constant_htons(IP_MF|IP_OFFSET)) &&
> +		    ((iph->protocol == IPPROTO_TCP) ||
> +		     (iph->protocol == IPPROTO_UDP)))
> +			hash = ntohs(*layer4hdr ^ *(layer4hdr + 1));
> +
> +		hash ^= (ntohl(iph->saddr ^ iph->daddr)) & 0xffff;
> +		goto got_hash;

The hash could should be same as existing Tx hash?

What about using hardware RSS values?
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