Re: [PATCH net-next v3 6/7] net: lan966x: Add support for XDP_TX

Alexander Lobakin
2022-11-22T16:57:07Z

From: Horatiu Vultur <horatiu.vultur@microchip.com>
Date: Mon, 21 Nov 2022 22:28:49 +0100

> Extend lan966x XDP support with the action XDP_TX. In this case when the
> received buffer needs to execute XDP_TX, the buffer will be moved to the
> TX buffers. So a new RX buffer will be allocated.
> When the TX finish with the frame, it would give back the buffer to the
> page pool.
>
> Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
> ---
> .../ethernet/microchip/lan966x/lan966x_fdma.c | 78 +++++++++++++++++--
> .../ethernet/microchip/lan966x/lan966x_main.c | 4 +-
> .../ethernet/microchip/lan966x/lan966x_main.h | 8 ++
> .../ethernet/microchip/lan966x/lan966x_xdp.c | 8 ++
> 4 files changed, 90 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
> index f8287a6a86ed5..b14fdb8e15e22 100644
> --- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
> +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
> @@ -411,12 +411,18 @@ static void lan966x_fdma_tx_clear_buf(struct lan966x *lan966x, int weight)
> dcb_buf->dev->stats.tx_bytes += dcb_buf->len;
>
> dcb_buf->used = false;
> - dma_unmap_single(lan966x->dev,
> - dcb_buf->dma_addr,
> - dcb_buf->len,
> - DMA_TO_DEVICE);
> - if (!dcb_buf->ptp)
> - dev_kfree_skb_any(dcb_buf->skb);
> + if (dcb_buf->skb) {
> + dma_unmap_single(lan966x->dev,
> + dcb_buf->dma_addr,
> + dcb_buf->len,
> + DMA_TO_DEVICE);
> +
> + if (!dcb_buf->ptp)
> + dev_kfree_skb_any(dcb_buf->skb);

Damn, forgot to remind you you wanted to switch to
napi_consume_skb() :s

> + }
> +
> + if (dcb_buf->xdpf)
> + xdp_return_frame_rx_napi(dcb_buf->xdpf);
>
> clear = true;
> }

[...]

> --
> 2.38.0

Thanks,
Olek