linux-kernel - Re: [RFC PATCH net-next 1/4] net: ti: icssg-prueth: Add helper functions to configure FDB

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Message-ID: <edfbaf8e-16df-4a25-8647-79b8730dca08@lunn.ch>
Date:   Mon, 4 Sep 2023 16:02:22 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     MD Danish Anwar <danishanwar@...com>
Cc:     Simon Horman <horms@...nel.org>, Roger Quadros <rogerq@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Richard Cochran <richardcochran@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org, srk@...com,
        r-gunasekaran@...com
Subject: Re: [RFC PATCH net-next 1/4] net: ti: icssg-prueth: Add helper
 functions to configure FDB

> +int icssg_send_fdb_msg(struct prueth_emac *emac, struct mgmt_cmd *cmd,
> +		       struct mgmt_cmd_rsp *rsp)
> +{
> +	struct prueth *prueth = emac->prueth;
> +	int slice = prueth_emac_slice(emac);
> +	int i = 10000;
> +	int addr;
> +
> +	addr = icssg_queue_pop(prueth, slice == 0 ?
> +			       ICSSG_CMD_POP_SLICE0 : ICSSG_CMD_POP_SLICE1);
> +	if (addr < 0)
> +		return addr;
> +
> +	/* First 4 bytes have FW owned buffer linking info which should
> +	 * not be touched
> +	 */
> +	memcpy_toio(prueth->shram.va + addr + 4, cmd, sizeof(*cmd));
> +	icssg_queue_push(prueth, slice == 0 ?
> +			 ICSSG_CMD_PUSH_SLICE0 : ICSSG_CMD_PUSH_SLICE1, addr);
> +	while (i--) {
> +		addr = icssg_queue_pop(prueth, slice == 0 ?
> +				       ICSSG_RSP_POP_SLICE0 : ICSSG_RSP_POP_SLICE1);
> +		if (addr < 0) {
> +			usleep_range(1000, 2000);
> +			continue;
> +		}

Please try to make use of include/linux/iopoll.h.

> +	if (i <= 0) {
> +		netdev_err(emac->ndev, "Timedout sending HWQ message\n");
> +		return -EINVAL;

Using iopoll.h will fix this, but -ETIMEDOUT, not -EINVAL.

      Andrew