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microudp.c: avoid redundant accesses into multi-level structures

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Werner Almesberger 2013-04-16 13:55:20 -03:00 committed by Sebastien Bourdeauducq
parent 0d21711c1b
commit 65b807b63f
1 changed files with 32 additions and 28 deletions
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60
software/bios/microudp.c
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@ -128,39 +128,42 @@ static unsigned int cached_ip;
static void process_arp(void) static void process_arp(void)
{ {
const struct arp_frame *rx_arp = &rxbuffer->frame.contents.arp;
struct arp_frame *tx_arp = &txbuffer->frame.contents.arp;
if(rxlen < 68) return; if(rxlen < 68) return;
if(rxbuffer->frame.contents.arp.hwtype != ARP_HWTYPE_ETHERNET) return; if(rx_arp->hwtype != ARP_HWTYPE_ETHERNET) return;
if(rxbuffer->frame.contents.arp.proto != ARP_PROTO_IP) return; if(rx_arp->proto != ARP_PROTO_IP) return;
if(rxbuffer->frame.contents.arp.hwsize != 6) return; if(rx_arp->hwsize != 6) return;
if(rxbuffer->frame.contents.arp.protosize != 4) return; if(rx_arp->protosize != 4) return;
if(rxbuffer->frame.contents.arp.opcode == ARP_OPCODE_REPLY) { if(rx_arp->opcode == ARP_OPCODE_REPLY) {
if(rxbuffer->frame.contents.arp.sender_ip == cached_ip) { if(rx_arp->sender_ip == cached_ip) {
int i; int i;
for(i=0;i<6;i++) for(i=0;i<6;i++)
cached_mac[i] = rxbuffer->frame.contents.arp.sender_mac[i]; cached_mac[i] = rx_arp->sender_mac[i];
} }
return; return;
} }
if(rxbuffer->frame.contents.arp.opcode == ARP_OPCODE_REQUEST) { if(rx_arp->opcode == ARP_OPCODE_REQUEST) {
if(rxbuffer->frame.contents.arp.target_ip == my_ip) { if(rx_arp->target_ip == my_ip) {
int i; int i;
fill_eth_header(&txbuffer->frame.eth_header, fill_eth_header(&txbuffer->frame.eth_header,
rxbuffer->frame.contents.arp.sender_mac, rx_arp->sender_mac,
my_mac, my_mac,
ETHERTYPE_ARP); ETHERTYPE_ARP);
txlen = 68; txlen = 68;
txbuffer->frame.contents.arp.hwtype = ARP_HWTYPE_ETHERNET; tx_arp->hwtype = ARP_HWTYPE_ETHERNET;
txbuffer->frame.contents.arp.proto = ARP_PROTO_IP; tx_arp->proto = ARP_PROTO_IP;
txbuffer->frame.contents.arp.hwsize = 6; tx_arp->hwsize = 6;
txbuffer->frame.contents.arp.protosize = 4; tx_arp->protosize = 4;
txbuffer->frame.contents.arp.opcode = ARP_OPCODE_REPLY; tx_arp->opcode = ARP_OPCODE_REPLY;
txbuffer->frame.contents.arp.sender_ip = my_ip; tx_arp->sender_ip = my_ip;
for(i=0;i<6;i++) for(i=0;i<6;i++)
txbuffer->frame.contents.arp.sender_mac[i] = my_mac[i]; tx_arp->sender_mac[i] = my_mac[i];
txbuffer->frame.contents.arp.target_ip = rxbuffer->frame.contents.arp.sender_ip; tx_arp->target_ip = rx_arp->sender_ip;
for(i=0;i<6;i++) for(i=0;i<6;i++)
txbuffer->frame.contents.arp.target_mac[i] = rxbuffer->frame.contents.arp.sender_mac[i]; tx_arp->target_mac[i] = rx_arp->sender_mac[i];
send_packet(); send_packet();
} }
return; return;
@ -171,6 +174,7 @@ static const unsigned char broadcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
int microudp_arp_resolve(unsigned int ip) int microudp_arp_resolve(unsigned int ip)
{ {
struct arp_frame *arp = &txbuffer->frame.contents.arp;
int i; int i;
int tries; int tries;
int timeout; int timeout;
@ -190,17 +194,17 @@ int microudp_arp_resolve(unsigned int ip)
my_mac, my_mac,
ETHERTYPE_ARP); ETHERTYPE_ARP);
txlen = 68; txlen = 68;
txbuffer->frame.contents.arp.hwtype = ARP_HWTYPE_ETHERNET; arp->hwtype = ARP_HWTYPE_ETHERNET;
txbuffer->frame.contents.arp.proto = ARP_PROTO_IP; arp->proto = ARP_PROTO_IP;
txbuffer->frame.contents.arp.hwsize = 6; arp->hwsize = 6;
txbuffer->frame.contents.arp.protosize = 4; arp->protosize = 4;
txbuffer->frame.contents.arp.opcode = ARP_OPCODE_REQUEST; arp->opcode = ARP_OPCODE_REQUEST;
txbuffer->frame.contents.arp.sender_ip = my_ip; arp->sender_ip = my_ip;
for(i=0;i<6;i++) for(i=0;i<6;i++)
txbuffer->frame.contents.arp.sender_mac[i] = my_mac[i]; arp->sender_mac[i] = my_mac[i];
txbuffer->frame.contents.arp.target_ip = ip; arp->target_ip = ip;
for(i=0;i<6;i++) for(i=0;i<6;i++)
txbuffer->frame.contents.arp.target_mac[i] = 0; arp->target_mac[i] = 0;
send_packet(); send_packet();
/* Do we get a reply ? */ /* Do we get a reply ? */