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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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5
include/asm-powerpc/system.h
View File

@ -365,8 +365,11 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
* powers of 2 writes until it reaches sufficient alignment).
*
* Based on this we disable the IP header alignment in network drivers.
* We also modify NET_SKB_PAD to be a cacheline in size, thus maintaining
* cacheline alignment of buffers.
*/
#define NET_IP_ALIGN 0
#define NET_IP_ALIGN 0
#define NET_SKB_PAD L1_CACHE_BYTES
#endif
#define arch_align_stack(x) (x)

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;
}

3
include/net/tcp.h
View File

@ -405,9 +405,6 @@ extern int tcp_disconnect(struct sock *sk, int flags);
extern void tcp_unhash(struct sock *sk);
extern int tcp_v4_hash_connecting(struct sock *sk);
/* From syncookies.c */
extern struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
struct ip_options *opt);

64
net/core/dev.c
View File

@ -1080,6 +1080,70 @@ void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
rcu_read_unlock();
}
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);
}
}
EXPORT_SYMBOL(__netif_schedule);
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);
}
EXPORT_SYMBOL(__netif_rx_schedule);
void dev_kfree_skb_any(struct sk_buff *skb)
{
if (in_irq() || irqs_disabled())
dev_kfree_skb_irq(skb);
else
dev_kfree_skb(skb);
}
EXPORT_SYMBOL(dev_kfree_skb_any);
/* Hot-plugging. */
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);
}
}
EXPORT_SYMBOL(netif_device_detach);
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);
}
}
EXPORT_SYMBOL(netif_device_attach);
/*
* Invalidate hardware checksum when packet is to be mangled, and
* complete checksum manually on outgoing path.

16
net/core/sock.c
View File

@ -385,7 +385,21 @@ set_sndbuf:
val = sysctl_rmem_max;
set_rcvbuf:
sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
/* FIXME: is this lower bound the right one? */
/*
* We double it on the way in to account for
* "struct sk_buff" etc. overhead. Applications
* assume that the SO_RCVBUF setting they make will
* allow that much actual data to be received on that
* socket.
*
* Applications are unaware that "struct sk_buff" and
* other overheads allocate from the receive buffer
* during socket buffer allocation.
*
* And after considering the possible alternatives,
* returning the value we actually used in getsockopt
* is the most desirable behavior.
*/
if ((val * 2) < SOCK_MIN_RCVBUF)
sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
else

6
net/dccp/feat.c
View File

@ -204,7 +204,7 @@ static int dccp_feat_reconcile(struct sock *sk, struct dccp_opt_pend *opt,
if (rc) {
kfree(opt->dccpop_sc->dccpoc_val);
kfree(opt->dccpop_sc);
opt->dccpop_sc = 0;
opt->dccpop_sc = NULL;
return rc;
}
@ -322,7 +322,7 @@ static void dccp_feat_empty_confirm(struct dccp_minisock *dmsk,
opt->dccpop_type = type == DCCPO_CHANGE_L ? DCCPO_CONFIRM_R :
DCCPO_CONFIRM_L;
opt->dccpop_feat = feature;
opt->dccpop_val = 0;
opt->dccpop_val = NULL;
opt->dccpop_len = 0;
/* change feature */
@ -523,7 +523,7 @@ int dccp_feat_clone(struct sock *oldsk, struct sock *newsk)
* once...
*/
/* the master socket no longer needs to worry about confirms */
opt->dccpop_sc = 0; /* it's not a memleak---new socket has it */
opt->dccpop_sc = NULL; /* it's not a memleak---new socket has it */
/* reset state for a new socket */
opt->dccpop_conf = 0;

2
net/decnet/dn_dev.c
View File

@ -620,7 +620,7 @@ int dn_dev_set_default(struct net_device *dev, int force)
}
write_unlock(&dndev_lock);
if (old)
dev_put(dev);
dev_put(old);
return rv;
}