linux-kernel - Re: [PATCH V3 2/4] misc: vop: do not allocate and reassign the used ring

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Message-ID: <20201023092650.GB29066@infradead.org>
Date:   Fri, 23 Oct 2020 10:26:50 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Sherry Sun <sherry.sun@....com>
Cc:     hch@...radead.org, sudeep.dutt@...el.com, ashutosh.dixit@...el.com,
        arnd@...db.de, gregkh@...uxfoundation.org, kishon@...com,
        lorenzo.pieralisi@....com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-imx@....com
Subject: Re: [PATCH V3 2/4] misc: vop: do not allocate and reassign the used
 ring

On Thu, Oct 22, 2020 at 01:06:36PM +0800, Sherry Sun wrote:
> We don't need to allocate and reassign the used ring here and remove the
> used_address_updated flag.Since RC has allocated the entire vring,
> including the used ring. Simply add the corresponding offset can get the
> used ring address.

Someone needs to verify this vs the existing intel implementations.

> -	used = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
> -					get_order(vdev->used_size[index]));
> +	used = va + PAGE_ALIGN(sizeof(struct vring_desc) * le16_to_cpu(config.num) +

This adds an over 80 char line.

> +	vdev->used[index] = config.address + PAGE_ALIGN(sizeof(struct vring_desc) * le16_to_cpu(config.num) +

Again.