From 00f33268ab02984a5fa8b3783b6096d4ce6c48c7 Mon Sep 17 00:00:00 2001
From: Joe Hershberger <joe.hershberger@ni.com>
Date: Wed, 23 May 2012 07:59:09 +0000
Subject: [PATCH] net: Refactor packet length computations
Save the length when it is computed instead of forgetting it and
subtracting pointers to figure it out again.
Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Simon Glass <sjg@chromium.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
---
net/arp.c | 13 ++++++++-----
net/ping.c | 7 ++++---
net/rarp.c | 6 ++++--
3 files changed, 16 insertions(+), 10 deletions(-)
diff --git a/net/arp.c b/net/arp.c
index 5ed875ca707..e58a074512d 100644
--- a/net/arp.c
+++ b/net/arp.c
@@ -52,12 +52,14 @@ void ArpRequest(void)
{
uchar *pkt;
struct arp_hdr *arp;
+ int eth_hdr_size;
debug("ARP broadcast %d\n", NetArpWaitTry);
pkt = NetTxPacket;
- pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP);
+ eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_ARP);
+ pkt += eth_hdr_size;
arp = (struct arp_hdr *) pkt;
@@ -86,7 +88,7 @@ void ArpRequest(void)
}
NetWriteIP(&arp->ar_tpa, NetArpWaitReplyIP);
- (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
+ (void) eth_send(NetTxPacket, eth_hdr_size + ARP_HDR_SIZE);
}
void ArpTimeoutCheck(void)
@@ -118,6 +120,7 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
struct arp_hdr *arp;
IPaddr_t reply_ip_addr;
uchar *pkt;
+ int eth_hdr_size;
/*
* We have to deal with two types of ARP packets:
@@ -155,14 +158,14 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
/* reply with our IP address */
debug("Got ARP REQUEST, return our IP\n");
pkt = (uchar *)et;
- pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
+ eth_hdr_size = NetSetEther(pkt, et->et_src, PROT_ARP);
+ pkt += eth_hdr_size;
arp->ar_op = htons(ARPOP_REPLY);
memcpy(&arp->ar_tha, &arp->ar_sha, ARP_HLEN);
NetCopyIP(&arp->ar_tpa, &arp->ar_spa);
memcpy(&arp->ar_sha, NetOurEther, ARP_HLEN);
NetCopyIP(&arp->ar_spa, &NetOurIP);
- (void) eth_send((uchar *)et,
- (pkt - (uchar *)et) + ARP_HDR_SIZE);
+ (void) eth_send((uchar *)et, eth_hdr_size + ARP_HDR_SIZE);
return;
case ARPOP_REPLY: /* arp reply */
diff --git a/net/ping.c b/net/ping.c
index c5256356690..939f8ff6fce 100644
--- a/net/ping.c
+++ b/net/ping.c
@@ -42,6 +42,7 @@ static int ping_send(void)
{
static uchar mac[6];
uchar *pkt;
+ int eth_hdr_size;
/* XXX always send arp request */
@@ -53,13 +54,13 @@ static int ping_send(void)
NetArpWaitPacketMAC = mac;
pkt = NetArpWaitTxPacket;
- pkt += NetSetEther(pkt, mac, PROT_IP);
+ eth_hdr_size = NetSetEther(pkt, mac, PROT_IP);
+ pkt += eth_hdr_size;
set_icmp_header(pkt, NetPingIP);
/* size of the waiting packet */
- NetArpWaitTxPacketSize =
- (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + 8;
+ NetArpWaitTxPacketSize = eth_hdr_size + IP_ICMP_HDR_SIZE;
/* and do the ARP request */
NetArpWaitTry = 1;
diff --git a/net/rarp.c b/net/rarp.c
index da50961d630..a715c2c7fd6 100644
--- a/net/rarp.c
+++ b/net/rarp.c
@@ -88,11 +88,13 @@ void RarpRequest(void)
{
uchar *pkt;
struct arp_hdr *rarp;
+ int eth_hdr_size;
printf("RARP broadcast %d\n", ++RarpTry);
pkt = NetTxPacket;
- pkt += NetSetEther(pkt, NetBcastAddr, PROT_RARP);
+ eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_RARP);
+ pkt += eth_hdr_size;
rarp = (struct arp_hdr *)pkt;
@@ -108,7 +110,7 @@ void RarpRequest(void)
/* dest IP addr set to broadcast */
memset(&rarp->ar_data[16], 0xff, 4);
- NetSendPacket(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
+ NetSendPacket(NetTxPacket, eth_hdr_size + ARP_HDR_SIZE);
NetSetTimeout(TIMEOUT, RarpTimeout);
}
--
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