linux-kernel - Re: [PATCH net-next] net: lan966x: Improve the CPU TX bitrate.

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Date:   Tue, 8 Mar 2022 22:36:09 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        UNGLinuxDriver@...rochip.com, davem@...emloft.net, kuba@...nel.org
Subject: Re: [PATCH net-next] net: lan966x: Improve the CPU TX bitrate.

>  static int lan966x_port_inj_ready(struct lan966x *lan966x, u8 grp)
>  {
> -	u32 val;
> +	unsigned long time = jiffies + usecs_to_jiffies(READL_TIMEOUT_US);
> +	int ret = 0;
>  
> -	return readx_poll_timeout_atomic(lan966x_port_inj_status, lan966x, val,
> -					 QS_INJ_STATUS_FIFO_RDY_GET(val) & BIT(grp),
> -					 READL_SLEEP_US, READL_TIMEOUT_US);
> +	while (!(lan_rd(lan966x, QS_INJ_STATUS) &
> +		 QS_INJ_STATUS_FIFO_RDY_SET(BIT(grp)))) {
> +		if (time_after(jiffies, time)) {
> +			ret = -ETIMEDOUT;
> +			break;
> +		}

Did you try setting READL_SLEEP_US to 0? readx_poll_timeout_atomic()
explicitly supports that.

    Andrew