[PATCH net v2 2/3] net: stmmac: Limit FIFO size by hardware capability
Yanteng Si
si.yanteng at linux.dev
Tue Jan 21 09:14:25 PST 2025
在 1/21/25 12:41, Kunihiko Hayashi 写道:
> Tx/Rx FIFO size is specified by the parameter "{tx,rx}-fifo-depth" from
> stmmac_platform layer.
>
> However, these values are constrained by upper limits determined by the
> capabilities of each hardware feature. There is a risk that the upper
> bits will be truncated due to the calculation, so it's appropriate to
> limit them to the upper limit values and display a warning message.
>
> Fixes: e7877f52fd4a ("stmmac: Read tx-fifo-depth and rx-fifo-depth from the devicetree")
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko at socionext.com>
> ---
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 251a8c15637f..da3316e3e93b 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -7245,6 +7245,19 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
> priv->plat->tx_queues_to_use = priv->dma_cap.number_tx_queues;
> }
>
> + if (priv->plat->rx_fifo_size > priv->dma_cap.rx_fifo_size) {
> + dev_warn(priv->device,
> + "Rx FIFO size exceeds dma capability (%d)\n",
> + priv->plat->rx_fifo_size);
> + priv->plat->rx_fifo_size = priv->dma_cap.rx_fifo_size;
I executed grep and found that only dwmac4 and dwxgmac2 have initialized
dma_cap.rx_fifo_size. Can this code still work properly on hardware
other than these two?
Thanks,
Yanteng
More information about the linux-arm-kernel
mailing list