netdev - Re: [PATCH bpf-next 08/10] [bpf]: make netronome nfp compatible w/ bpf_xdp_adjust

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Date:   Tue, 17 Apr 2018 16:08:29 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     "Nikita V. Shirokov" <tehnerd@...nerd.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next 08/10] [bpf]: make netronome nfp compatible w/
 bpf_xdp_adjust_tail

On Mon, Apr 16, 2018 at 11:51:29PM -0700, Nikita V. Shirokov wrote:
> w/ bpf_xdp_adjust_tail helper xdp's data_end pointer could be changed as
> well (only "decrease" of pointer's location is going to be supported).
> changing of this pointer will change packet's size.
> for nfp driver we will just calculate packet's length unconditionally
> 
> Signed-off-by: Nikita V. Shirokov <tehnerd@...nerd.com>
> ---
>  drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
> index 1eb6549f2a54..d9111c077699 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
> +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
> @@ -1722,7 +1722,7 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
>  
>  			act = bpf_prog_run_xdp(xdp_prog, &xdp);
>  
> -			pkt_len -= xdp.data - orig_data;
> +			pkt_len = xdp.data_end - xdp.data;

Looks correct, but Jakub please review.