[PATCH] Decrease number of pointer derefs in nfnetlink_queue.c
From: Jesper Juhl
Date: Thu Dec 08 2005 - 17:35:18 EST
Hi,
Here's a small patch to decrease the number of pointer derefs in
net/netfilter/nfnetlink_queue.c
Benefits of the patch:
- Fewer pointer dereferences should make the code slightly faster.
- Size of generated code is smaller
- improved readability
Please consider applying.
Signed-off-by: Jesper Juhl <jesper.juhl@xxxxxxxxx>
---
net/netfilter/nfnetlink_queue.c | 79 ++++++++++++++++++++++------------------
1 files changed, 44 insertions(+), 35 deletions(-)
orig:
text data bss dec hex filename
5357 244 64 5665 1621 net/netfilter/nfnetlink_queue.o
patched:
text data bss dec hex filename
5335 244 64 5643 160b net/netfilter/nfnetlink_queue.o
--- linux-2.6.15-rc5-git1-orig/net/netfilter/nfnetlink_queue.c 2005-12-04 18:48:58.000000000 +0100
+++ linux-2.6.15-rc5-git1/net/netfilter/nfnetlink_queue.c 2005-12-08 19:47:22.000000000 +0100
@@ -345,6 +345,10 @@ nfqnl_build_packet_message(struct nfqnl_
struct nfqnl_msg_packet_hdr pmsg;
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
+ struct nf_info *entinf = entry->info;
+ struct sk_buff *entskb = entry->skb;
+ struct net_device *indev;
+ struct net_device *outdev;
unsigned int tmp_uint;
QDEBUG("entered\n");
@@ -361,6 +365,8 @@ nfqnl_build_packet_message(struct nfqnl_
+ NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hw))
+ NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_timestamp));
+ outdev = entinf->outdev;
+
spin_lock_bh(&queue->lock);
switch (queue->copy_mode) {
@@ -370,15 +376,15 @@ nfqnl_build_packet_message(struct nfqnl_
break;
case NFQNL_COPY_PACKET:
- if (entry->skb->ip_summed == CHECKSUM_HW &&
- (*errp = skb_checksum_help(entry->skb,
- entry->info->outdev == NULL))) {
+ if (entskb->ip_summed == CHECKSUM_HW &&
+ (*errp = skb_checksum_help(entskb,
+ outdev == NULL))) {
spin_unlock_bh(&queue->lock);
return NULL;
}
if (queue->copy_range == 0
- || queue->copy_range > entry->skb->len)
- data_len = entry->skb->len;
+ || queue->copy_range > entskb->len)
+ data_len = entskb->len;
else
data_len = queue->copy_range;
@@ -402,29 +408,30 @@ nfqnl_build_packet_message(struct nfqnl_
NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
sizeof(struct nfgenmsg));
nfmsg = NLMSG_DATA(nlh);
- nfmsg->nfgen_family = entry->info->pf;
+ nfmsg->nfgen_family = entinf->pf;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(queue->queue_num);
pmsg.packet_id = htonl(entry->id);
- pmsg.hw_protocol = htons(entry->skb->protocol);
- pmsg.hook = entry->info->hook;
+ pmsg.hw_protocol = htons(entskb->protocol);
+ pmsg.hook = entinf->hook;
NFA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg);
- if (entry->info->indev) {
- tmp_uint = htonl(entry->info->indev->ifindex);
+ indev = entinf->indev;
+ if (indev) {
+ tmp_uint = htonl(indev->ifindex);
#ifndef CONFIG_BRIDGE_NETFILTER
NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint);
#else
- if (entry->info->pf == PF_BRIDGE) {
+ if (entinf->pf == PF_BRIDGE) {
/* Case 1: indev is physical input device, we need to
* look for bridge group (when called from
* netfilter_bridge) */
NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV, sizeof(tmp_uint),
&tmp_uint);
/* this is the bridge group "brX" */
- tmp_uint = htonl(entry->info->indev->br_port->br->dev->ifindex);
+ tmp_uint = htonl(indev->br_port->br->dev->ifindex);
NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint),
&tmp_uint);
} else {
@@ -432,9 +439,9 @@ nfqnl_build_packet_message(struct nfqnl_
* physical device (when called from ipv4) */
NFA_PUT(skb, NFQA_IFINDEX_INDEV, sizeof(tmp_uint),
&tmp_uint);
- if (entry->skb->nf_bridge
- && entry->skb->nf_bridge->physindev) {
- tmp_uint = htonl(entry->skb->nf_bridge->physindev->ifindex);
+ if (entskb->nf_bridge
+ && entskb->nf_bridge->physindev) {
+ tmp_uint = htonl(entskb->nf_bridge->physindev->ifindex);
NFA_PUT(skb, NFQA_IFINDEX_PHYSINDEV,
sizeof(tmp_uint), &tmp_uint);
}
@@ -442,19 +449,19 @@ nfqnl_build_packet_message(struct nfqnl_
#endif
}
- if (entry->info->outdev) {
- tmp_uint = htonl(entry->info->outdev->ifindex);
+ if (outdev) {
+ tmp_uint = htonl(outdev->ifindex);
#ifndef CONFIG_BRIDGE_NETFILTER
NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint);
#else
- if (entry->info->pf == PF_BRIDGE) {
+ if (entinf->pf == PF_BRIDGE) {
/* Case 1: outdev is physical output device, we need to
* look for bridge group (when called from
* netfilter_bridge) */
NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint),
&tmp_uint);
/* this is the bridge group "brX" */
- tmp_uint = htonl(entry->info->outdev->br_port->br->dev->ifindex);
+ tmp_uint = htonl(outdev->br_port->br->dev->ifindex);
NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint),
&tmp_uint);
} else {
@@ -462,9 +469,9 @@ nfqnl_build_packet_message(struct nfqnl_
* physical output device (when called from ipv4) */
NFA_PUT(skb, NFQA_IFINDEX_OUTDEV, sizeof(tmp_uint),
&tmp_uint);
- if (entry->skb->nf_bridge
- && entry->skb->nf_bridge->physoutdev) {
- tmp_uint = htonl(entry->skb->nf_bridge->physoutdev->ifindex);
+ if (entskb->nf_bridge
+ && entskb->nf_bridge->physoutdev) {
+ tmp_uint = htonl(entskb->nf_bridge->physoutdev->ifindex);
NFA_PUT(skb, NFQA_IFINDEX_PHYSOUTDEV,
sizeof(tmp_uint), &tmp_uint);
}
@@ -472,27 +479,27 @@ nfqnl_build_packet_message(struct nfqnl_
#endif
}
- if (entry->skb->nfmark) {
- tmp_uint = htonl(entry->skb->nfmark);
+ if (entskb->nfmark) {
+ tmp_uint = htonl(entskb->nfmark);
NFA_PUT(skb, NFQA_MARK, sizeof(u_int32_t), &tmp_uint);
}
- if (entry->info->indev && entry->skb->dev
- && entry->skb->dev->hard_header_parse) {
+ if (indev && entskb->dev
+ && entskb->dev->hard_header_parse) {
struct nfqnl_msg_packet_hw phw;
phw.hw_addrlen =
- entry->skb->dev->hard_header_parse(entry->skb,
+ entskb->dev->hard_header_parse(entskb,
phw.hw_addr);
phw.hw_addrlen = htons(phw.hw_addrlen);
NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw);
}
- if (entry->skb->tstamp.off_sec) {
+ if (entskb->tstamp.off_sec) {
struct nfqnl_msg_packet_timestamp ts;
- ts.sec = cpu_to_be64(entry->skb->tstamp.off_sec);
- ts.usec = cpu_to_be64(entry->skb->tstamp.off_usec);
+ ts.sec = cpu_to_be64(entskb->tstamp.off_sec);
+ ts.usec = cpu_to_be64(entskb->tstamp.off_usec);
NFA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts);
}
@@ -510,7 +517,7 @@ nfqnl_build_packet_message(struct nfqnl_
nfa->nfa_type = NFQA_PAYLOAD;
nfa->nfa_len = size;
- if (skb_copy_bits(entry->skb, 0, NFA_DATA(nfa), data_len))
+ if (skb_copy_bits(entskb, 0, NFA_DATA(nfa), data_len))
BUG();
}
@@ -667,12 +674,14 @@ nfqnl_set_mode(struct nfqnl_instance *qu
static int
dev_cmp(struct nfqnl_queue_entry *entry, unsigned long ifindex)
{
- if (entry->info->indev)
- if (entry->info->indev->ifindex == ifindex)
+ struct nf_info *entinf = entry->info;
+
+ if (entinf->indev)
+ if (entinf->indev->ifindex == ifindex)
return 1;
- if (entry->info->outdev)
- if (entry->info->outdev->ifindex == ifindex)
+ if (entinf->outdev)
+ if (entinf->outdev->ifindex == ifindex)
return 1;
return 0;
-
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