On Fri, Aug 02, 2024 at 11:59:31AM +0200, Louis Peens wrote:
> From: Kyle Xu <zhenbing.xu@xxxxxxxxxxxx>
>
> Add a new kernel module ‘nfp_vdpa’ for the NFP vDPA networking driver.
>
> The vDPA driver initializes the necessary resources on the VF and the
> data path will be offloaded. It also implements the ‘vdpa_config_ops’
> and the corresponding callback interfaces according to the requirement
> of kernel vDPA framework.
>
> Signed-off-by: Kyle Xu <zhenbing.xu@xxxxxxxxxxxx>
> Signed-off-by: Louis Peens <louis.peens@xxxxxxxxxxxx>
...
> diff --git a/drivers/vdpa/netronome/nfp_vdpa_main.c b/drivers/vdpa/netronome/nfp_vdpa_main.c
...
> +static int nfp_vdpa_map_resources(struct nfp_vdpa_net *ndev,
> + struct pci_dev *pdev,
> + const struct nfp_dev_info *dev_info)
> +{
> + unsigned int bar_off, bar_sz, tx_bar_sz, rx_bar_sz;
> + unsigned int max_tx_rings, max_rx_rings, txq, rxq;
> + u64 tx_bar_off, rx_bar_off;
> + resource_size_t map_addr;
> + void __iomem *tx_bar;
> + void __iomem *rx_bar;
Hi Kyle and Louis,
A minor nit from my side: rx_bar is set but otherwise unused in this function.
> + int err;
> +
> + /* Map CTRL BAR */
> + ndev->ctrl_bar = ioremap(pci_resource_start(pdev, NFP_NET_CTRL_BAR),
> + NFP_NET_CFG_BAR_SZ);
> + if (!ndev->ctrl_bar)
> + return -EIO;
> +
> + /* Find out how many rings are supported */
> + max_tx_rings = readl(ndev->ctrl_bar + NFP_NET_CFG_MAX_TXRINGS);
> + max_rx_rings = readl(ndev->ctrl_bar + NFP_NET_CFG_MAX_RXRINGS);
> + /* Currently, only one ring is supported */
> + if (max_tx_rings != NFP_VDPA_QUEUE_RING_MAX || max_rx_rings != NFP_VDPA_QUEUE_RING_MAX) {
> + err = -EINVAL;
> + goto ctrl_bar_unmap;
> + }
> +
> + /* Map Q0_BAR as a single overlapping BAR mapping */
> + tx_bar_sz = NFP_QCP_QUEUE_ADDR_SZ * max_tx_rings * NFP_VDPA_QUEUE_SPACE_STRIDE;
> + rx_bar_sz = NFP_QCP_QUEUE_ADDR_SZ * max_rx_rings * NFP_VDPA_QUEUE_SPACE_STRIDE;
> +
> + txq = readl(ndev->ctrl_bar + NFP_NET_CFG_START_TXQ);
> + tx_bar_off = nfp_qcp_queue_offset(dev_info, txq);
> + rxq = readl(ndev->ctrl_bar + NFP_NET_CFG_START_RXQ);
> + rx_bar_off = nfp_qcp_queue_offset(dev_info, rxq);
> +
> + bar_off = min(tx_bar_off, rx_bar_off);
> + bar_sz = max(tx_bar_off + tx_bar_sz, rx_bar_off + rx_bar_sz);
> + bar_sz -= bar_off;
> +
> + map_addr = pci_resource_start(pdev, NFP_NET_Q0_BAR) + bar_off;
> + ndev->q_bar = ioremap(map_addr, bar_sz);
> + if (!ndev->q_bar) {
> + err = -EIO;
> + goto ctrl_bar_unmap;
> + }
> +
> + tx_bar = ndev->q_bar + (tx_bar_off - bar_off);
> + rx_bar = ndev->q_bar + (rx_bar_off - bar_off);
> +
> + /* TX queues */
> + ndev->vring[txq].kick_addr = ndev->ctrl_bar + NFP_VDPA_NOTIFY_AREA_BASE
> + + txq * NFP_VDPA_QUEUE_NOTIFY_OFFSET;
> + /* RX queues */
> + ndev->vring[rxq].kick_addr = ndev->ctrl_bar + NFP_VDPA_NOTIFY_AREA_BASE
> + + rxq * NFP_VDPA_QUEUE_NOTIFY_OFFSET;
> + /* Stash the re-configuration queue away. First odd queue in TX Bar */
> + ndev->qcp_cfg = tx_bar + NFP_QCP_QUEUE_ADDR_SZ;
> +
> + return 0;
> +
> +ctrl_bar_unmap:
> + iounmap(ndev->ctrl_bar);
> + return err;
> +}
...
