netdev - Re: [PATCH net v2] nfp: bpf: relax prog rejection for mtu check through max_pkt

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Date:   Thu, 28 Oct 2021 07:58:35 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Simon Horman <simon.horman@...igine.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        oss-drivers@...igine.com, Yu Xiao <yu.xiao@...igine.com>,
        Yinjun Zhang <yinjun.zhang@...igine.com>,
        Niklas Soderlund <niklas.soderlund@...igine.com>
Subject: Re: [PATCH net v2] nfp: bpf: relax prog rejection for mtu check
 through max_pkt_offset

On Thu, 28 Oct 2021 12:00:36 +0200 Simon Horman wrote:
> From: Yu Xiao <yu.xiao@...igine.com>
> 
> MTU change is refused whenever the value of new MTU is bigger than
> the max packet bytes that fits in NFP Cluster Target Memory (CTM).
> However, an eBPF program doesn't always need to access the whole
> packet data.
> 
> The maximum direct packet access (DPA) offset has always been
> caculated by verifier and stored in the max_pkt_offset field of prog
> aux data.
> 
> Signed-off-by: Yu Xiao <yu.xiao@...igine.com>
> Reviewed-by: Yinjun Zhang <yinjun.zhang@...igine.com>
> Reviewed-by: Niklas Soderlund <niklas.soderlund@...igine.com>
> Signed-off-by: Simon Horman <simon.horman@...igine.com>

Looks fine, not sure why it's tagged for net but okay..