netdev - Re: [PATCH bpf-next v3 1/2] xsk: store struct xdp_sock as a flexible array member of the XSKMAP

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Message-ID: <20191028110056.17eea9fb@cakuba.hsd1.ca.comcast.net>
Date:   Mon, 28 Oct 2019 11:00:56 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Björn Töpel <bjorn.topel@...il.com>
Cc:     netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        Björn Töpel <bjorn.topel@...el.com>,
        bpf@...r.kernel.org, magnus.karlsson@...il.com,
        magnus.karlsson@...el.com, maciej.fijalkowski@...el.com,
        jonathan.lemon@...il.com, toke@...hat.com
Subject: Re: [PATCH bpf-next v3 1/2] xsk: store struct xdp_sock as a
 flexible array member of the XSKMAP

On Fri, 25 Oct 2019 11:32:18 +0200, Björn Töpel wrote:
> From: Björn Töpel <bjorn.topel@...el.com>
> 
> Prior this commit, the array storing XDP socket instances were stored
> in a separate allocated array of the XSKMAP. Now, we store the sockets
> as a flexible array member in a similar fashion as the arraymap. Doing
> so, we do less pointer chasing in the lookup.
> 
> Signed-off-by: Björn Töpel <bjorn.topel@...el.com>

Damn, looks like I managed to reply to v2. 

I think the size maths may overflow on 32bit machines on the addition.