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SubjectRe: [RFC PATCH 34/35] Add the Xen virtual network device driver.
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> +#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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