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Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

Browse source 
* master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6:
  [NET]: Allow skb headroom to be overridden
  [TCP]: Kill unused extern decl for tcp_v4_hash_connecting()
  [NET]: add SO_RCVBUF comment
  [NET]: Deinline some larger functions from netdevice.h
  [DCCP]: Use NULL for pointers, comfort sparse.
  [DECNET]: Fix refcount
This commit is contained in:
Linus Torvalds 2006-03-31 12:52:30 -08:00
commit 4b75679f60
8 changed files with 117 additions and 63 deletions
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55
include/linux/netdevice.h
View file

@ -598,20 +598,7 @@ DECLARE_PER_CPU(struct softnet_data,softnet_data);
#define HAVE_NETIF_QUEUE
static inline void __netif_schedule(struct net_device *dev)
{
if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
unsigned long flags;
struct softnet_data *sd;
local_irq_save(flags);
sd = &__get_cpu_var(softnet_data);
dev->next_sched = sd->output_queue;
sd->output_queue = dev;
raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_restore(flags);
}
}
extern void __netif_schedule(struct net_device *dev);
static inline void netif_schedule(struct net_device *dev)
{
@ -675,13 +662,7 @@ static inline void dev_kfree_skb_irq(struct sk_buff *skb)
/* Use this variant in places where it could be invoked
* either from interrupt or non-interrupt context.
*/
static inline void dev_kfree_skb_any(struct sk_buff *skb)
{
if (in_irq() || irqs_disabled())
dev_kfree_skb_irq(skb);
else
dev_kfree_skb(skb);
}
extern void dev_kfree_skb_any(struct sk_buff *skb);
#define HAVE_NETIF_RX 1
extern int netif_rx(struct sk_buff *skb);
@ -768,22 +749,9 @@ static inline int netif_device_present(struct net_device *dev)
return test_bit(__LINK_STATE_PRESENT, &dev->state);
}
static inline void netif_device_detach(struct net_device *dev)
{
if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
netif_running(dev)) {
netif_stop_queue(dev);
}
}
extern void netif_device_detach(struct net_device *dev);
static inline void netif_device_attach(struct net_device *dev)
{
if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
netif_running(dev)) {
netif_wake_queue(dev);
__netdev_watchdog_up(dev);
}
}
extern void netif_device_attach(struct net_device *dev);
/*
* Network interface message level settings
@ -851,20 +819,7 @@ static inline int netif_rx_schedule_prep(struct net_device *dev)
* already been called and returned 1.
*/
static inline void __netif_rx_schedule(struct net_device *dev)
{
unsigned long flags;
local_irq_save(flags);
dev_hold(dev);
list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
if (dev->quota < 0)
dev->quota += dev->weight;
else
dev->quota = dev->weight;
__raise_softirq_irqoff(NET_RX_SOFTIRQ);
local_irq_restore(flags);
}
extern void __netif_rx_schedule(struct net_device *dev);
/* Try to reschedule poll. Called by irq handler. */

29
include/linux/skbuff.h
View file

@ -941,6 +941,25 @@ static inline void skb_reserve(struct sk_buff *skb, int len)
#define NET_IP_ALIGN 2
#endif
/*
* The networking layer reserves some headroom in skb data (via
* dev_alloc_skb). This is used to avoid having to reallocate skb data when
* the header has to grow. In the default case, if the header has to grow
* 16 bytes or less we avoid the reallocation.
*
* Unfortunately this headroom changes the DMA alignment of the resulting
* network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive
* on some architectures. An architecture can override this value,
* perhaps setting it to a cacheline in size (since that will maintain
* cacheline alignment of the DMA). It must be a power of 2.
*
* Various parts of the networking layer expect at least 16 bytes of
* headroom, you should not reduce this.
*/
#ifndef NET_SKB_PAD
#define NET_SKB_PAD 16
#endif
extern int ___pskb_trim(struct sk_buff *skb, unsigned int len, int realloc);
static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
@ -1030,9 +1049,9 @@ static inline void __skb_queue_purge(struct sk_buff_head *list)
static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
gfp_t gfp_mask)
{
struct sk_buff *skb = alloc_skb(length + 16, gfp_mask);
struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD, gfp_mask);
if (likely(skb))
skb_reserve(skb, 16);
skb_reserve(skb, NET_SKB_PAD);
return skb;
}
#else
@ -1070,13 +1089,15 @@ static inline struct sk_buff *dev_alloc_skb(unsigned int length)
*/
static inline int skb_cow(struct sk_buff *skb, unsigned int headroom)
{
int delta = (headroom > 16 ? headroom : 16) - skb_headroom(skb);
int delta = (headroom > NET_SKB_PAD ? headroom : NET_SKB_PAD) -
skb_headroom(skb);
if (delta < 0)
delta = 0;
if (delta || skb_cloned(skb))
return pskb_expand_head(skb, (delta + 15) & ~15, 0, GFP_ATOMIC);
return pskb_expand_head(skb, (delta + (NET_SKB_PAD-1)) &
~(NET_SKB_PAD-1), 0, GFP_ATOMIC);
return 0;
}