netdev - Re: [PATCH v3 net-next 2/8] net: mvneta: introduce page pool API for sw buffer manager

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Date:   Tue, 15 Oct 2019 15:41:07 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, lorenzo.bianconi@...hat.com,
        davem@...emloft.net, thomas.petazzoni@...tlin.com,
        brouer@...hat.com, ilias.apalodimas@...aro.org,
        matteo.croce@...hat.com, mw@...ihalf.com
Subject: Re: [PATCH v3 net-next 2/8] net: mvneta: introduce page pool API
 for sw buffer manager

On Mon, 14 Oct 2019 12:49:49 +0200, Lorenzo Bianconi wrote:
> +static int mvneta_create_page_pool(struct mvneta_port *pp,
> +				   struct mvneta_rx_queue *rxq, int size)
> +{
> +	struct page_pool_params pp_params = {
> +		.order = 0,
> +		.flags = PP_FLAG_DMA_MAP,
> +		.pool_size = size,
> +		.nid = cpu_to_node(0),
> +		.dev = pp->dev->dev.parent,
> +		.dma_dir = DMA_FROM_DEVICE,
> +	};
> +	int err;
> +
> +	rxq->page_pool = page_pool_create(&pp_params);
> +	if (IS_ERR(rxq->page_pool)) {
> +		err = PTR_ERR(rxq->page_pool);
> +		rxq->page_pool = NULL;
> +		return err;
> +	}
> +
> +	err = xdp_rxq_info_reg(&rxq->xdp_rxq, pp->dev, 0);

The queue_index is always passed as 0, is there only a single queue?
XDP programs can read this field.

> +	if (err < 0)
> +		goto err_free_pp;
> +
> +	err = xdp_rxq_info_reg_mem_model(&rxq->xdp_rxq, MEM_TYPE_PAGE_POOL,
> +					 rxq->page_pool);
> +	if (err)
> +		goto err_unregister_rxq;
> +
> +	return 0;
> +
> +err_unregister_rxq:
> +	xdp_rxq_info_unreg(&rxq->xdp_rxq);
> +err_free_pp:
> +	page_pool_destroy(rxq->page_pool);
> +	return err;
> +}