linux-kernel - Re: [PATCH 1/6] Drivers: net: hyperv: Enable scatter gather I/O

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Date:	Thu, 06 Mar 2014 14:29:19 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	kys@...rosoft.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	jasowang@...hat.com
Subject: Re: [PATCH 1/6] Drivers: net: hyperv: Enable scatter gather I/O

From: "K. Y. Srinivasan" <kys@...rosoft.com>
Date: Thu,  6 Mar 2014 03:13:05 -0800

> @@ -140,21 +140,125 @@ static void netvsc_xmit_completion(void *context)
>  		dev_kfree_skb_any(skb);
>  }
>  
> +static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
> +			struct hv_page_buffer *pb)
> +{
> +	int j = 0;
> +	/*
> +	 * Deal with compund pages by ignoring unused part
> +	 * of the page.
> +	 */
> +	page += offset  >> PAGE_SHIFT;
> +	offset &= ~PAGE_MASK;

Please put an empty line between local variable declarations and
the code.

Please format comments:

	/* Like
	 * this.
	 */

> +	while (len > 0) {
> +		unsigned long bytes;
> +		bytes = PAGE_SIZE - offset;

Empty line between local variable declarations and code.

> +	/*
> +	 * The packet is laid out thus:
> +	 * 1. hdr
> +	 * 2. skb linear data
> +	 * 3. skb fragment data
> +	 */

Fix comment formatting as explained above.

> +	if (hdr != NULL) {
> +		slots_used += fill_pg_buf(virt_to_page(hdr),
> +					offset_in_page(hdr),
> +					len, &pb[slots_used]);
> +	}

Single statment basic blocks do not need surrounding braces.

> +	/*
> +	 * We will atmost need two pages to describe the rndis
> +	 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
> +	 * of pages in a single packet.
> +	 */

Comment formatting.
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