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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2007-04-20 05:29:13 +0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-26 07:26:28 +0200 |
| commit | 27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 (patch) | |
| tree | 5a267e40f9b94014be38dad5de0a52b6628834e0 /net/sched/sch_atm.c | |
| parent | [VLAN] vlan_dev: Use skb_reset_network_header(). (diff) | |
| download | linux-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.tar.xz linux-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.zip | |
[SK_BUFF]: Convert skb->tail to sk_buff_data_t
So that it is also an offset from skb->head, reduces its size from 8 to 4 bytes
on 64bit architectures, allowing us to combine the 4 bytes hole left by the
layer headers conversion, reducing struct sk_buff size to 256 bytes, i.e. 4
64byte cachelines, and since the sk_buff slab cache is SLAB_HWCACHE_ALIGN...
:-)
Many calculations that previously required that skb->{transport,network,
mac}_header be first converted to a pointer now can be done directly, being
meaningful as offsets or pointers.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_atm.c')
| -rw-r--r-- | net/sched/sch_atm.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c index baca8743c12b..1d7bb1632138 100644 --- a/net/sched/sch_atm.c +++ b/net/sched/sch_atm.c @@ -631,7 +631,7 @@ static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, { struct atm_qdisc_data *p = PRIV(sch); struct atm_flow_data *flow = (struct atm_flow_data *) cl; - unsigned char *b = skb->tail; + unsigned char *b = skb_tail_pointer(skb); struct rtattr *rta; DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n", @@ -661,7 +661,7 @@ static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(zero),&zero); } - rta->rta_len = skb->tail-b; + rta->rta_len = skb_tail_pointer(skb) - b; return skb->len; rtattr_failure: |