netdev - Re: [RFC PATCH v2 2/2] net: ixgbe: implement af

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Date:	Tue, 13 Jan 2015 13:05:30 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	netdev@...r.kernel.org, danny.zhou@...el.com,
	nhorman@...driver.com, dborkman@...hat.com, john.ronciak@...el.com,
	brouer@...hat.com
Subject: Re: [RFC PATCH v2 2/2] net: ixgbe: implement af_packet direct queue
 mappings

On Mo, 2015-01-12 at 20:35 -0800, John Fastabend wrote:
> +static int
> +ixgbe_ndo_qpair_page_map(struct vm_area_struct *vma, struct net_device *dev)
> +{
> +	struct ixgbe_adapter *adapter = netdev_priv(dev);
> +	phys_addr_t phy_addr = pci_resource_start(adapter->pdev, 0);
> +	unsigned long pfn_rx = (phy_addr + RX_DESC_ADDR_OFFSET) >> PAGE_SHIFT;
> +	unsigned long pfn_tx = (phy_addr + TX_DESC_ADDR_OFFSET) >> PAGE_SHIFT;
> +	unsigned long dummy_page_phy;
> +	pgprot_t pre_vm_page_prot;
> +	unsigned long start;
> +	unsigned int i;
> +	int err;
> +
> +	if (!dummy_page_buf) {
> +		dummy_page_buf = kzalloc(PAGE_SIZE_4K, GFP_KERNEL);
> +		if (!dummy_page_buf)
> +			return -ENOMEM;
> +
> +		for (i = 0; i < PAGE_SIZE_4K / sizeof(unsigned int); i++)
> +			dummy_page_buf[i] = 0xdeadbeef;
> +	}
> +
> +	dummy_page_phy = virt_to_phys(dummy_page_buf);
> +	pre_vm_page_prot = vma->vm_page_prot;
> +	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
> +
> +	/* assume the vm_start is 4K aligned address */
> +	for (start = vma->vm_start;
> +	     start < vma->vm_end;
> +	     start += PAGE_SIZE_4K) {
> +		if (start == vma->vm_start + RX_DESC_ADDR_OFFSET) {
> +			err = remap_pfn_range(vma, start, pfn_rx, PAGE_SIZE_4K,
> +					      vma->vm_page_prot);
> +			if (err)
> +				return -EAGAIN;
> +		} else if (start == vma->vm_start + TX_DESC_ADDR_OFFSET) {
> +			err = remap_pfn_range(vma, start, pfn_tx, PAGE_SIZE_4K,
> +					      vma->vm_page_prot);
> +			if (err)
> +				return -EAGAIN;
> +		} else {
> +			unsigned long addr = dummy_page_phy > PAGE_SHIFT;

I guess you have forgotten to delete this line?

> +
> +			err = remap_pfn_range(vma, start, addr, PAGE_SIZE_4K,
> +					      pre_vm_page_prot);
> +			if (err)
> +				return -EAGAIN;
> +		}
> +	}
> +	return 0;
> +}


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