netdev - Re: [net-next, PATCH 2/2, v1] net: socionext: add AF

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Message-ID: <20180910162132.GA16240@apalos>
Date:   Mon, 10 Sep 2018 19:21:32 +0300
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Cc:     netdev@...r.kernel.org, jaswinder.singh@...aro.org,
        ard.biesheuvel@...aro.org, masami.hiramatsu@...aro.org,
        arnd@...db.de, mykyta.iziumtsev@...aro.org, bjorn.topel@...el.com,
        magnus.karlsson@...el.com
Subject: Re: [net-next, PATCH 2/2, v1] net: socionext: add AF_XDP support

> > @@ -707,6 +731,26 @@ static int netsec_process_rx(struct netsec_priv *priv, int budget)
> >  		if (unlikely(!buf_addr))
> >  			break;
> >  
> > +		if (xdp_prog) {
> > +			xdp_result = netsec_run_xdp(desc, priv, xdp_prog,
> > +						    pkt_len);
> > +			if (xdp_result != NETSEC_XDP_PASS) {
> > +				xdp_flush |= xdp_result & NETSEC_XDP_REDIR;
> > +
> > +				dma_unmap_single_attrs(priv->dev,
> > +						       desc->dma_addr,
> > +						       desc->len, DMA_TO_DEVICE,
> > +						       DMA_ATTR_SKIP_CPU_SYNC);
> > +
> > +				desc->len = desc_len;
> > +				desc->dma_addr = dma_handle;
> > +				desc->addr = buf_addr;
> > +				netsec_rx_fill(priv, idx, 1);
> > +				nsetsec_adv_desc(&dring->tail);
> > +			}
> > +			continue;
> 
> Continue even on XDP_PASS? Is this really correct?
> 
> Also seems there is no handling of adjust_head/tail for XDP_PASS case.
> 
A question on this. Should XDP related frames be allocated using 1 page
per packet?

Thanks

Ilias