xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[SK_BUFF]: Convert skb->tail to sk_buff_data_t

Browse Source 
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>
This commit is contained in:
Arnaldo Carvalho de Melo
2007-04-19 20:29:13 -07:00
committed by David S. Miller
parent be8bd86321
commit 27a884dc3c
110 changed files with 396 additions and 329 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wan/hdlc_fr.c
View File

@@ -533,7 +533,7 @@ static void fr_lmi_send(struct net_device *dev, int fullrep)
skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
}
data = skb->tail;
data = skb_tail_pointer(skb);
data[i++] = LMI_CALLREF;
data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
if (lmi == LMI_ANSI)

4
drivers/net/wan/lmc/lmc_main.c
View File

@@ -1636,7 +1636,7 @@ static int lmc_rx (struct net_device *dev) /*fold00*/
if (nsb) {
sc->lmc_rxq[i] = nsb;
nsb->dev = dev;
sc->lmc_rxring[i].buffer1 = virt_to_bus (nsb->tail);
sc->lmc_rxring[i].buffer1 = virt_to_bus(skb_tail_pointer(nsb));
}
sc->failed_recv_alloc = 1;
goto skip_packet;
@@ -1679,7 +1679,7 @@ static int lmc_rx (struct net_device *dev) /*fold00*/
if (nsb) {
sc->lmc_rxq[i] = nsb;
nsb->dev = dev;
sc->lmc_rxring[i].buffer1 = virt_to_bus (nsb->tail);
sc->lmc_rxring[i].buffer1 = virt_to_bus(skb_tail_pointer(nsb));
/* Transferred to 21140 below */
}
else {