[U-Boot] [PATCH] net/arp: account for ARP delay, avoid duplicate packets on timeout
Stefan Brüns
stefan.bruens at rwth-aachen.de
Sun Aug 30 17:46:54 CEST 2015
eth_rx() in the main reception loop may trigger sending a packet which
is already timed out (or will immediately) upon reception of an ARP reply.
As long as the ARP reply is pending, the timeout handler of a packet
should be postponed.
Happens on TFTP with bad network (e.g. WLAN).
Signed-off-by: Stefan Brüns <stefan.bruens at rwth-aachen.de>
---
net/arp.c | 5 +++--
net/arp.h | 2 +-
net/net.c | 4 +++-
3 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/net/arp.c b/net/arp.c
index b1f12bf..824d2e9 100644
--- a/net/arp.c
+++ b/net/arp.c
@@ -96,12 +96,12 @@ void arp_request(void)
arp_raw_request(net_ip, net_null_ethaddr, net_arp_wait_reply_ip);
}
-void arp_timeout_check(void)
+int arp_timeout_check(void)
{
ulong t;
if (!net_arp_wait_packet_ip.s_addr)
- return;
+ return 0;
t = get_timer(0);
@@ -118,6 +118,7 @@ void arp_timeout_check(void)
arp_request();
}
}
+ return 1;
}
void arp_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
diff --git a/net/arp.h b/net/arp.h
index 43c6296..a288d61 100644
--- a/net/arp.h
+++ b/net/arp.h
@@ -25,7 +25,7 @@ void arp_init(void);
void arp_request(void);
void arp_raw_request(struct in_addr source_ip, const uchar *targetEther,
struct in_addr target_ip);
-void arp_timeout_check(void);
+int arp_timeout_check(void);
void arp_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len);
#endif /* __ARP_H__ */
diff --git a/net/net.c b/net/net.c
index 2a6efd8..6c56e52 100644
--- a/net/net.c
+++ b/net/net.c
@@ -569,7 +569,9 @@ restart:
goto done;
}
- arp_timeout_check();
+ if (arp_timeout_check() > 0) {
+ time_start = get_timer(0);
+ }
/*
* Check for a timeout, and run the timeout handler
--
2.1.4
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