linux-kernel - Re: [PATCH net-next 1/8] net: hns3: Add HNS3 VF IMP(Integrated Management Proc) cmd interface

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Message-Id: <20171205.113744.2040678170803031734.davem@davemloft.net>
Date:   Tue, 05 Dec 2017 11:37:44 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     salil.mehta@...wei.com
Cc:     yisen.zhuang@...wei.com, lipeng321@...wei.com,
        mehta.salil.lnk@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        linuxarm@...wei.com
Subject: Re: [PATCH net-next 1/8] net: hns3: Add HNS3 VF IMP(Integrated
 Management Proc) cmd interface

From: Salil Mehta <salil.mehta@...wei.com>
Date: Sun, 3 Dec 2017 12:33:00 +0000

> +static int hclgevf_ring_space(struct hclgevf_cmq_ring *ring)
> +{
> +	int ntu = ring->next_to_use;
> +	int ntc = ring->next_to_clean;
> +	int used = (ntu - ntc + ring->desc_num) % ring->desc_num;

Order local variables from longest to shortest line, please.

Audit your entire submission for this issue.

> +static int hclgevf_cmd_csq_done(struct hclgevf_hw *hw)
> +{
> +	u32 head = hclgevf_read_dev(hw, HCLGEVF_NIC_CSQ_HEAD_REG);
> +	return head == hw->cmq.csq.next_to_use;
> +}

Please return bool from this function.

> +void hclgevf_cmd_setup_basic_desc(struct hclgevf_desc *desc,
> +				  enum hclgevf_opcode_type opcode, bool is_read)
> +{
> +	memset((void *)desc, 0, sizeof(struct hclgevf_desc));

You never need casts like this, when the functions argument is void any
pointer can be passed in as-is.

> +
> +	/* If the command is sync, wait for the firmware to write back,
> +	 * if multi descriptors to be sent, use the first one to check
> +	 */
> +	if (HCLGEVF_SEND_SYNC(le16_to_cpu(desc->flag))) {
> +		do {
> +			if (hclgevf_cmd_csq_done(hw))
> +				break;
> +			udelay(1);
> +			timeout++;
> +		} while (timeout < hw->cmq.tx_timeout);
> +	}

This is potentially a long timeout with a spinlock held.  Consider using
sleeping and completions.