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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/irda/qos.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/irda/qos.c')
| -rw-r--r-- | net/irda/qos.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/net/irda/qos.c b/net/irda/qos.c index 349012c926b7..aeb18cf1dcae 100644 --- a/net/irda/qos.c +++ b/net/irda/qos.c @@ -469,49 +469,49 @@ int irlap_insert_qos_negotiation_params(struct irlap_cb *self, int ret; /* Insert data rate */ - ret = irda_param_insert(self, PI_BAUD_RATE, skb->tail, + ret = irda_param_insert(self, PI_BAUD_RATE, skb_tail_pointer(skb), skb_tailroom(skb), &irlap_param_info); if (ret < 0) return ret; skb_put(skb, ret); /* Insert max turnaround time */ - ret = irda_param_insert(self, PI_MAX_TURN_TIME, skb->tail, + ret = irda_param_insert(self, PI_MAX_TURN_TIME, skb_tail_pointer(skb), skb_tailroom(skb), &irlap_param_info); if (ret < 0) return ret; skb_put(skb, ret); /* Insert data size */ - ret = irda_param_insert(self, PI_DATA_SIZE, skb->tail, + ret = irda_param_insert(self, PI_DATA_SIZE, skb_tail_pointer(skb), skb_tailroom(skb), &irlap_param_info); if (ret < 0) return ret; skb_put(skb, ret); /* Insert window size */ - ret = irda_param_insert(self, PI_WINDOW_SIZE, skb->tail, + ret = irda_param_insert(self, PI_WINDOW_SIZE, skb_tail_pointer(skb), skb_tailroom(skb), &irlap_param_info); if (ret < 0) return ret; skb_put(skb, ret); /* Insert additional BOFs */ - ret = irda_param_insert(self, PI_ADD_BOFS, skb->tail, + ret = irda_param_insert(self, PI_ADD_BOFS, skb_tail_pointer(skb), skb_tailroom(skb), &irlap_param_info); if (ret < 0) return ret; skb_put(skb, ret); /* Insert minimum turnaround time */ - ret = irda_param_insert(self, PI_MIN_TURN_TIME, skb->tail, + ret = irda_param_insert(self, PI_MIN_TURN_TIME, skb_tail_pointer(skb), skb_tailroom(skb), &irlap_param_info); if (ret < 0) return ret; skb_put(skb, ret); /* Insert link disconnect/threshold time */ - ret = irda_param_insert(self, PI_LINK_DISC, skb->tail, + ret = irda_param_insert(self, PI_LINK_DISC, skb_tail_pointer(skb), skb_tailroom(skb), &irlap_param_info); if (ret < 0) return ret; |