netdev - Re: [PATCH v6 10/15] io_uring/zcrx: add io_zcrx

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Message-ID: <3aebbd91-6f2f-4c8c-82db-4d09e39e7946@kernel.dk>
Date: Mon, 21 Oct 2024 09:35:26 -0600
From: Jens Axboe <axboe@...nel.dk>
To: David Wei <dw@...idwei.uk>, io-uring@...r.kernel.org,
 netdev@...r.kernel.org
Cc: Pavel Begunkov <asml.silence@...il.com>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jesper Dangaard Brouer <hawk@...nel.org>, David Ahern <dsahern@...nel.org>,
 Mina Almasry <almasrymina@...gle.com>,
 Stanislav Fomichev <stfomichev@...il.com>, Joe Damato <jdamato@...tly.com>,
 Pedro Tammela <pctammela@...atatu.com>
Subject: Re: [PATCH v6 10/15] io_uring/zcrx: add io_zcrx_area

On 10/16/24 12:52 PM, David Wei wrote:
> +static int io_zcrx_create_area(struct io_ring_ctx *ctx,
> +			       struct io_zcrx_ifq *ifq,
> +			       struct io_zcrx_area **res,
> +			       struct io_uring_zcrx_area_reg *area_reg)
> +{
> +	struct io_zcrx_area *area;
> +	int i, ret, nr_pages;
> +	struct iovec iov;
> +
> +	if (area_reg->flags || area_reg->rq_area_token)
> +		return -EINVAL;
> +	if (area_reg->__resv1 || area_reg->__resv2[0] || area_reg->__resv2[1])
> +		return -EINVAL;
> +	if (area_reg->addr & ~PAGE_MASK || area_reg->len & ~PAGE_MASK)
> +		return -EINVAL;
> +
> +	iov.iov_base = u64_to_user_ptr(area_reg->addr);
> +	iov.iov_len = area_reg->len;
> +	ret = io_buffer_validate(&iov);
> +	if (ret)
> +		return ret;
> +
> +	ret = -ENOMEM;
> +	area = kzalloc(sizeof(*area), GFP_KERNEL);
> +	if (!area)
> +		goto err;
> +
> +	area->pages = io_pin_pages((unsigned long)area_reg->addr, area_reg->len,
> +				   &nr_pages);
> +	if (IS_ERR(area->pages)) {
> +		ret = PTR_ERR(area->pages);
> +		area->pages = NULL;
> +		goto err;
> +	}
> +	area->nia.num_niovs = nr_pages;
> +
> +	area->nia.niovs = kvmalloc_array(nr_pages, sizeof(area->nia.niovs[0]),
> +					 GFP_KERNEL | __GFP_ZERO);
> +	if (!area->nia.niovs)
> +		goto err;
> +
> +	area->freelist = kvmalloc_array(nr_pages, sizeof(area->freelist[0]),
> +					GFP_KERNEL | __GFP_ZERO);
> +	if (!area->freelist)
> +		goto err;
> +
> +	for (i = 0; i < nr_pages; i++) {
> +		area->freelist[i] = i;
> +	}
> +
> +	area->free_count = nr_pages;
> +	area->ifq = ifq;
> +	/* we're only supporting one area per ifq for now */
> +	area->area_id = 0;
> +	area_reg->rq_area_token = (u64)area->area_id << IORING_ZCRX_AREA_SHIFT;
> +	spin_lock_init(&area->freelist_lock);
> +	*res = area;
> +	return 0;
> +err:
> +	if (area)
> +		io_zcrx_free_area(area);
> +	return ret;
> +}

Minor nit, but I think this would be nicer returning area and just using
ERR_PTR() for the errors.

Outside of that:

Reviewed-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe