netdev - Re: [PATCH v5 2/3] io_uring: add api to set / get napi configuration.

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Message-ID: <35168b29-a81c-e1b2-7ec9-b5f0b896ee74@kernel.dk>
Date:   Mon, 21 Nov 2022 12:46:40 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Stefan Roesch <shr@...kernel.io>, kernel-team@...com
Cc:     olivier@...llion01.com, netdev@...r.kernel.org,
        io-uring@...r.kernel.org, kuba@...nel.org
Subject: Re: [PATCH v5 2/3] io_uring: add api to set / get napi configuration.

On 11/21/22 12:14?PM, Stefan Roesch wrote:
> +static int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
> +{
> +#ifdef CONFIG_NET_RX_BUSY_POLL
> +	const struct io_uring_napi curr = {
> +		.busy_poll_to = ctx->napi_busy_poll_to,
> +	};
> +
> +	if (copy_to_user(arg, &curr, sizeof(curr)))
> +		return -EFAULT;
> +
> +	WRITE_ONCE(ctx->napi_busy_poll_to, 0);
> +	return 0;
> +#else
> +	return -EINVAL;
> +#endif
> +}

Should probably check resv/pad here as well, maybe even the
'busy_poll_to' being zero?

-- 
Jens Axboe