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SubjectRe: [patch 37/44] xen: add virtual network device driver

> +struct netfront_info {
> + struct list_head list;
> + struct net_device *netdev;
> +
> + struct net_device_stats stats;

There is now a net_device_stats element inside net_device on
2.6.21 or later.

> +
> + struct xen_netif_tx_front_ring tx;
> + struct xen_netif_rx_front_ring rx;
> +
> + spinlock_t tx_lock;
> + spinlock_t rx_lock;

It might be a performance advantage to reorder/align these
structure elements to put transmit hot elements together, and
put tx and rx on different cache lines?

> + unsigned int evtchn;
> +
> + /* Receive-ring batched refills. */
> +#define RX_MIN_TARGET 8
> +#define RX_DFL_MIN_TARGET 64
> +#define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256)
> + unsigned rx_min_target, rx_max_target, rx_target;
> + struct sk_buff_head rx_batch;
> +
> + struct timer_list rx_refill_timer;
> +
> + /*
> + * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries
> + * are linked from tx_skb_freelist through skb_entry.link.
> + *
> + * NB. Freelist index entries are always going to be less than
> + * PAGE_OFFSET, whereas pointers to skbs will always be equal or
> + * greater than PAGE_OFFSET: we use this property to distinguish
> + * them.
> + */
> + union skb_entry {
> + struct sk_buff *skb;
> + unsigned link;
> + } tx_skbs[NET_TX_RING_SIZE];
> + grant_ref_t gref_tx_head;
> + grant_ref_t grant_tx_ref[NET_TX_RING_SIZE];
> + unsigned tx_skb_freelist;
> +
> + struct sk_buff *rx_skbs[NET_RX_RING_SIZE];
> + grant_ref_t gref_rx_head;
> + grant_ref_t grant_rx_ref[NET_RX_RING_SIZE];
> +
> + struct xenbus_device *xbdev;
> + int tx_ring_ref;
> + int rx_ring_ref;
> +
> + unsigned long rx_pfn_array[NET_RX_RING_SIZE];
> + struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1];
> + struct mmu_update rx_mmu[NET_RX_RING_SIZE];
> +};
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