netdev - Re: [RFC, PATCH 1/2, net-next] net: netsec: Use page

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Date:   Thu, 27 Jun 2019 11:37:08 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc:     netdev@...r.kernel.org, jaswinder.singh@...aro.org,
        ard.biesheuvel@...aro.org, bjorn.topel@...el.com,
        magnus.karlsson@...el.com, daniel@...earbox.net, ast@...nel.org,
        makita.toshiaki@....ntt.co.jp, jakub.kicinski@...ronome.com,
        john.fastabend@...il.com, davem@...emloft.net, brouer@...hat.com
Subject: Re: [RFC, PATCH 1/2, net-next] net: netsec: Use page_pool API

On Tue, 25 Jun 2019 18:06:18 +0300
Ilias Apalodimas <ilias.apalodimas@...aro.org> wrote:

> @@ -1059,7 +1059,23 @@ static void netsec_setup_tx_dring(struct netsec_priv *priv)
>  static int netsec_setup_rx_dring(struct netsec_priv *priv)
>  {
>  	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
> -	int i;
> +	struct page_pool_params pp_params = { 0 };
> +	int i, err;
> +
> +	pp_params.order = 0;
> +	/* internal DMA mapping in page_pool */
> +	pp_params.flags = PP_FLAG_DMA_MAP;
> +	pp_params.pool_size = DESC_NUM;
> +	pp_params.nid = cpu_to_node(0);
> +	pp_params.dev = priv->dev;
> +	pp_params.dma_dir = DMA_FROM_DEVICE;

I was going to complain about this DMA_FROM_DEVICE, until I noticed
that in next patch you have:

 pp_params.dma_dir = xdp_prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;

Making a note here to help other reviewers.

> +	dring->page_pool = page_pool_create(&pp_params);
> +	if (IS_ERR(dring->page_pool)) {
> +		err = PTR_ERR(dring->page_pool);
> +		dring->page_pool = NULL;
> +		goto err_out;
> +	}
>  


-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer