Re: [RFC PATCH 34/35] Add the Xen virtual network device driver.

[Arjan van de Ven <arjan@infradead.org>]

> +#ifdef CONFIG_XEN_BALLOON
> +#include <xen/balloon.h>
> +#endif

such ifdefs are butt-ugly and should be inside the header at least

> +#ifndef __GFP_NOWARN
> +#define __GFP_NOWARN 0
> +#endif

eehhh why?


> +#define alloc_xen_skb(_l) __dev_alloc_skb((_l), GFP_ATOMIC|__GFP_NOWARN)

why does xen need it's own alloc_skb variant?

> +static unsigned long rx_pfn_array[NET_RX_RING_SIZE];
> +static struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1];
> +static struct mmu_update rx_mmu[NET_RX_RING_SIZE];

does this mean you can only have 1 network interface? that sounds silly


> +
> +/* Access macros for acquiring freeing slots in {tx,rx}_skbs[]. */
> +#define ADD_ID_TO_FREELIST(_list, _id)			\
> +	(_list)[(_id)] = (_list)[0];			\
> +	(_list)[0]     = (void *)(unsigned long)(_id);
> +#define GET_ID_FROM_FREELIST(_list)				\
> +	({ unsigned long _id = (unsigned long)(_list)[0];	\
> +	   (_list)[0]  = (_list)[_id];				\
> +	   (unsigned short)_id; })

these should be inlines at leas

> +
> +/** Send a packet on a net device to encourage switches to learn the
> + * MAC. We send a fake ARP request.

why is this inside a driver?????

> +	if (unlikely((((unsigned long)skb->data & ~PAGE_MASK) + skb->len) >=
> +		     PAGE_SIZE)) {
> +		struct sk_buff *nskb;
> +		if (unlikely((nskb = alloc_xen_skb(skb->len)) == NULL))
> +			goto drop;
> +		skb_put(nskb, skb->len);
> +		memcpy(nskb->data, skb->data, skb->len);
> +		nskb->dev = skb->dev;
> +		dev_kfree_skb(skb);
> +		skb = nskb;
> +	}

hmm this smells fishy

> +
> +static int xennet_proc_read(


why is this device driver adding new own /proc crud ?


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