netdev - Re: [PATCH bpf-next] xdp: report rx queue index in xdp

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Date:   Tue, 16 Aug 2022 11:45:30 +0200
From:   Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, netdev@...r.kernel.org, davem@...emloft.net,
        kuba@...nel.org, edumazet@...gle.com, pabeni@...hat.com,
        hawk@...nel.org, john.fastabend@...il.com
Subject: Re: [PATCH bpf-next] xdp: report rx queue index in xdp_frame

> Report rx queue index in xdp_frame according to the xdp_buff xdp_rxq_info
> pointer. xdp_frame queue_index is currently used in cpumap code to covert
> the xdp_frame into a xdp_buff.
> xdp_frame size is not increased adding queue_index since an alignment padding
> in the structure is used to insert queue_index field.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  include/net/xdp.h   | 2 ++
>  kernel/bpf/cpumap.c | 2 +-
>  2 files changed, 3 insertions(+), 1 deletion(-)


Hi Alexei and Daniel,

this patch is marked as 'new, archived' in patchwork.
Do I need to rebase and repost it?

Regards,
Lorenzo

> 
> diff --git a/include/net/xdp.h b/include/net/xdp.h
> index 04c852c7a77f..3567866b0af5 100644
> --- a/include/net/xdp.h
> +++ b/include/net/xdp.h
> @@ -172,6 +172,7 @@ struct xdp_frame {
>  	struct xdp_mem_info mem;
>  	struct net_device *dev_rx; /* used by cpumap */
>  	u32 flags; /* supported values defined in xdp_buff_flags */
> +	u32 queue_index;
>  };
>  
>  static __always_inline bool xdp_frame_has_frags(struct xdp_frame *frame)
> @@ -301,6 +302,7 @@ struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp)
>  
>  	/* rxq only valid until napi_schedule ends, convert to xdp_mem_info */
>  	xdp_frame->mem = xdp->rxq->mem;
> +	xdp_frame->queue_index = xdp->rxq->queue_index;
>  
>  	return xdp_frame;
>  }
> diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
> index f4860ac756cd..09a792d088b3 100644
> --- a/kernel/bpf/cpumap.c
> +++ b/kernel/bpf/cpumap.c
> @@ -228,7 +228,7 @@ static int cpu_map_bpf_prog_run_xdp(struct bpf_cpu_map_entry *rcpu,
>  
>  		rxq.dev = xdpf->dev_rx;
>  		rxq.mem = xdpf->mem;
> -		/* TODO: report queue_index to xdp_rxq_info */
> +		rxq.queue_index = xdpf->queue_index;
>  
>  		xdp_convert_frame_to_buff(xdpf, &xdp);
>  
> -- 
> 2.37.1
> 

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