On Sun, Apr 29, 2007 at 10:29:02AM -0700, Jeremy Fitzhardinge wrote:
> +#include <linux/version.h>
not needed.
> +#include <xen/xenbus.h>
> +#include <xen/interface/io/netif.h>
> +#include <xen/interface/memory.h>
> +#ifdef CONFIG_XEN_BALLOON
> +#include <xen/balloon.h>
> +#endif
> +#include <xen/interface/grant_table.h>
Please don't try to put such a fucked up include hierachy in.
Just move everything under include/xen or you will soon get
problems with the 80 line length limit for your includes..
Also please make sure that <xen/balloon.h> can be included unconditionally,
as we really don't like ifdefs around includes.
> +struct netfront_info {
> + struct list_head list;
> + struct net_device *netdev;
> +
> + struct net_device_stats stats;
> +
> + struct netif_tx_front_ring tx;
> + struct netif_rx_front_ring rx;
> +
> + spinlock_t tx_lock;
> + spinlock_t rx_lock;
> +
> + unsigned int evtchn, irq;
> + unsigned int copying_receiver;
> + unsigned int carrier;
This doesn't not look like exactly smart cacheline alignment :)
> + grant_ref_t gref_tx_head;
What's a grant_ref_t? Should this really be a typedef or better
a struct type? Also it really wants a xen_ prefix instead of someting
so generic.
> + * Implement our own carrier flag: the network stack's version causes delays
> + * when the carrier is re-enabled (in particular, dev_activate() may not
> + * immediately be called, which can cause packet loss).
> + */
Did you talk to the networking folks about these problems?
> +#define netfront_carrier_on(netif) ((netif)->carrier = 1)
> +#define netfront_carrier_off(netif) ((netif)->carrier = 0)
> +#define netfront_carrier_ok(netif) ((netif)->carrier)
Please use proper symbolic names for the ctal states and kill these
wrappers.
> +static int setup_device(struct xenbus_device *, struct netfront_info *);
> +static struct net_device *create_netdev(struct xenbus_device *);
> +
> +static void end_access(int, void *);
> +static void netif_disconnect_backend(struct netfront_info *);
> +
> +static int network_connect(struct net_device *);
> +static void network_tx_buf_gc(struct net_device *);
> +static void network_alloc_rx_buffers(struct net_device *);
> +
> +static irqreturn_t netif_int(int irq, void *dev_id);
Any chance you could avoid these forward-prototypes by reordering
the functions a little?
Also a lot of these names are horribly generic. A proper xennet_
prefix would probably help.
> +static inline int xennet_can_sg(struct net_device *dev)
> +{
> + return dev->features & NETIF_F_SG;
> +}
totally useless wrapper.
> +static int __devexit netfront_remove(struct xenbus_device *dev)
> +{
> + struct netfront_info *info = dev->dev.driver_data;
> +
> + dev_dbg(&dev->dev, "%s\n", dev->nodename);
> +
> + netif_disconnect_backend(info);
> +
> + del_timer_sync(&info->rx_refill_timer);
> +
> + xennet_sysfs_delif(info->netdev);
> +
> + unregister_netdev(info->netdev);
> +
> + free_netdev(info->netdev);
This looks like very wrong ordering to me. unregister_netdev should
be the first thing in the remove function.
> + SHARED_RING_INIT(rxs);
> + FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE);
Can you replace these shouting macros with proper named functions?
> + * receive ring. This creates a less bursty demand on the memory
> + * allocator, so should reduce the chance of failed allocation requests
> + * both for ourself and for other kernel subsystems.
> + */
> + batch_target = np->rx_target - (req_prod - np->rx.rsp_cons);
> + for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) {
> + /*
> + * Allocate an skb and a page. Do not use __dev_alloc_skb as
> + * that will allocate page-sized buffers which is not
> + * necessary here.
> + * 16 bytes added as necessary headroom for netif_receive_skb.
> + */
> + skb = alloc_skb(RX_COPY_THRESHOLD + 16 + NET_IP_ALIGN,
> + GFP_ATOMIC | __GFP_NOWARN);
This comment doesn't make any sense, __dev_alloc_skb is:
static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
gfp_t gfp_mask)
{
struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD, gfp_mask);
if (likely(skb))
skb_reserve(skb, NET_SKB_PAD);
return skb;
}
then again what you really should be using here is __netdev_alloc_skb.
> +#ifdef CONFIG_XEN_BALLOON
> + /* Tell the ballon driver what is going on. */
> + balloon_update_driver_allowance(i);
> +#endif
This should be a noop for !CONFIG_XEN_BALLOON in the header,
and there should be no need for ifdefs here.
> + skb->nh.raw = (void *)skb_shinfo(skb)->frags[0].page;
> + skb->h.raw = skb->nh.raw + rx->offset;
Stuff like this won't compile anymore in the current tree.
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