[PATCH v2 03/18] net/r8169: add hardware registers access routines

[Stephen Hemminger]

On Thu, 17 Oct 2024 14:31:45 +0800
Howard Wang <howard_wang at realsil.com.cn> wrote:

> +u32
> +rtl_csi_read(struct rtl_hw *hw, u32 addr)
> +{
> +	u32 cmd;
> +	int i;
> +	u32 value = 0;
> +
> +	cmd = CSIAR_Read | CSIAR_ByteEn << CSIAR_ByteEn_shift |
> +	      (addr & CSIAR_Addr_Mask);
> +
> +	RTL_W32(hw, CSIAR, cmd);
> +
> +	for (i = 0; i < 10; i++) {
> +		udelay(100);

With DPDK drivers, it is preferred to use rte_delay instead of usleep.
Usleep ends up being a system call (nanosleep) and that can take much
longer than you want. rte_delay_us() is a spin loop.