Hi Ivan,
>From below code snippets, it looks like you only allocated 1 page_pool
and sharing it with several RX-queues, as I don't have the full context
and don't know this driver, I might be wrong?
To be clear, a page_pool object is needed per RX-queue, as it is
accessing a small RX page cache (which protected by NAPI/softirq).
On Thu, 30 May 2019 21:20:39 +0300
Ivan Khoronzhuk <ivan.khoronz...@linaro.org> wrote:
> @@ -1404,6 +1711,14 @@ static int cpsw_ndo_open(struct net_device *ndev)
> enable_irq(cpsw->irqs_table[0]);
> }
>
> + pool_size = cpdma_get_num_rx_descs(cpsw->dma);
> + cpsw->page_pool = cpsw_create_page_pool(cpsw, pool_size);
> + if (IS_ERR(cpsw->page_pool)) {
> + ret = PTR_ERR(cpsw->page_pool);
> + cpsw->page_pool = NULL;
> + goto err_cleanup;
> + }
On Thu, 30 May 2019 21:20:39 +0300
Ivan Khoronzhuk <ivan.khoronz...@linaro.org> wrote:
> @@ -675,10 +742,33 @@ int cpsw_set_ringparam(struct net_device *ndev,
> if (cpsw->usage_count)
> cpdma_chan_split_pool(cpsw->dma);
>
> + for (i = 0; i < cpsw->data.slaves; i++) {
> + struct net_device *ndev = cpsw->slaves[i].ndev;
> +
> + if (!(ndev && netif_running(ndev)))
> + continue;
> +
> + cpsw_xdp_unreg_rxqs(netdev_priv(ndev));
> + }
> +
> + page_pool_destroy(cpsw->page_pool);
> + cpsw->page_pool = pool;
> +
On Thu, 30 May 2019 21:20:39 +0300
Ivan Khoronzhuk <ivan.khoronz...@linaro.org> wrote:
> +void cpsw_xdp_unreg_rxqs(struct cpsw_priv *priv)
> +{
> + struct cpsw_common *cpsw = priv->cpsw;
> + int i;
> +
> + for (i = 0; i < cpsw->rx_ch_num; i++)
> + xdp_rxq_info_unreg(&priv->xdp_rxq[i]);
> +}
On Thu, 30 May 2019 21:20:39 +0300
Ivan Khoronzhuk <ivan.khoronz...@linaro.org> wrote:
> +int cpsw_xdp_reg_rxq(struct cpsw_priv *priv, int ch)
> +{
> + struct xdp_rxq_info *xdp_rxq = &priv->xdp_rxq[ch];
> + struct cpsw_common *cpsw = priv->cpsw;
> + int ret;
> +
> + ret = xdp_rxq_info_reg(xdp_rxq, priv->ndev, ch);
> + if (ret)
> + goto err_cleanup;
> +
> + ret = xdp_rxq_info_reg_mem_model(xdp_rxq, MEM_TYPE_PAGE_POOL,
> + cpsw->page_pool);
> + if (ret)
> + goto err_cleanup;
> +
> + return 0;
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
