netdev - Re: [PATCH net-next] liquidio: store the L4 hash of rx packets in skb

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Date:   Mon, 9 Jan 2017 10:45:05 -0800
From:   Felix Manlunas <felix.manlunas@...ium.com>
To:     David Miller <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <raghu.vatsavayi@...ium.com>,
        <derek.chickles@...ium.com>, <satananda.burla@...ium.com>
Subject: Re: [PATCH net-next] liquidio: store the L4 hash of rx packets in skb

David Miller <davem@...emloft.net> wrote on Sun [2017-Jan-08 17:09:41 -0500]:
> From: Felix Manlunas <felix.manlunas@...ium.com>
> Date: Fri, 6 Jan 2017 16:55:42 -0800
> 
> >  
> > +		if (rh->r_dh.has_hash) {
> > +			u32 hash = be32_to_cpu(*(u32 *)(skb->data + r_dh_off));
> 
> Is the checksum defined to be in the first 4-bytes of the 8-byte DHLEN unit,
> or the second 4-bytes?  Is the answer to this question endian-dependent?

The hash is always in the first 4-bytes.  The location of the hash is endian
independent.  The hash itself (in its original form) is big endian.