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

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Message-ID: <qvqwedtmzv55.fsf@dev0134.prn3.facebook.com>
Date:   Mon, 28 Nov 2022 12:22:19 -0800
From:   Stefan Roesch <shr@...kernel.io>
To:     Ammar Faizi <ammarfaizi2@...weeb.org>
Cc:     Facebook Kernel Team <kernel-team@...com>,
        Jens Axboe <axboe@...nel.dk>,
        Olivier Langlois <olivier@...llion01.com>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev Mailing List <netdev@...r.kernel.org>,
        io-uring Mailing List <io-uring@...r.kernel.org>
Subject: Re: [PATCH v5 2/3] io_uring: add api to set / get napi configuration.


Ammar Faizi <ammarfaizi2@...weeb.org> writes:

> On 11/22/22 2:14 AM, 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
>> +}
>> +
> I suggest allowing users to pass a NULL as the arg in case they
> don't want to care about the old values.
>
> Something like:
>
>    io_uring_unregister_napi(ring, NULL);
>
> What do you think?

Sounds good, i can make that change in the next version.