linux-kernel - Re: [PATCH v4 6/7] nvme-tcp: Allow userspace to trigger a KeyUpdate with debugfs

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Message-ID: <20251017043157.GB30271@lst.de>
Date: Fri, 17 Oct 2025 06:31:57 +0200
From: Christoph Hellwig <hch@....de>
To: alistair23@...il.com
Cc: chuck.lever@...cle.com, hare@...nel.org,
	kernel-tls-handshake@...ts.linux.dev, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-nvme@...ts.infradead.org, linux-nfs@...r.kernel.org,
	kbusch@...nel.org, axboe@...nel.dk, hch@....de, sagi@...mberg.me,
	kch@...dia.com, hare@...e.de,
	Alistair Francis <alistair.francis@....com>
Subject: Re: [PATCH v4 6/7] nvme-tcp: Allow userspace to trigger a
 KeyUpdate with debugfs

On Fri, Oct 17, 2025 at 02:23:11PM +1000, alistair23@...il.com wrote:
> +#ifdef CONFIG_NVME_TCP_TLS
> +#define NVME_DEBUGFS_RW_ATTR(field) \
> +	static int field##_open(struct inode *inode, struct file *file) \
> +	{ return single_open(file, field##_show, inode->i_private); } \

Please use normal indentation in the macro, but do not add an extra
level of indentation just for being inside a macro.

Then again the macro is only used once anyway, so why add it at all?

> +static ssize_t nvme_ctrl_key_update_write(struct file *file, const char __user *buf,

Please avoid the overly long line.

> +					  size_t count, loff_t *ppos)
> +{
> +	struct seq_file *m = file->private_data;
> +	struct nvme_ctrl *nctrl = m->private;
> +	struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
> +	char kbuf[16] = {0};
> +	int queue_nr, rc;
> +	struct nvme_tcp_queue *queue;
> +
> +	if (count > sizeof(kbuf) - 1)
> +		return -EINVAL;
> +	if (copy_from_user(kbuf, buf, count))
> +		return -EFAULT;
> +	kbuf[count] = 0;
> +
> +	rc = kstrtouint(kbuf, 10, &queue_nr);
> +	if (rc)
> +		return rc;

kstrtoint_from_user?