Hi,
I've written a ethernet device driver based on 2.6.4
sis190.c, and I am testing it on my 2.4.25 machine. I
am currently testing the transmit part and couldn't
figure out the scenorio I've seen. Can someone shed
some light PLEASE !
After I configure the ethernet interface(it's a PCI
card plugged in my debian PC), I run command ' ping -c
1 192.168.0.100', (the interface is configured with IP
address 192.168.0.35), I used smartbit to look at the
wire and found 3 ping packets. From the debugging
info, I can see dev->hard_start_xmit is called three
times, the DMA engine seems to be acting correctly,
and each time hard_start_xmit is invoked the skb
address is different. How can this happen? Could it be
sth related to tx timeout? I am not very clear about
what happens between IP send and dev->hard_start_xmit
besides knowing there is a queue for skb, and if
device is busy, the skb will be re-queued? Can someone
give me some idea about how the driver communicate
with the upper layer software about the status of its
transmit ? There used to be tbusy I remember, but I've
lost track of what happen there after.
Btw, I run different number of ping packets, here is
some result, Haven't been able to make sense out of it
yet.
ping -c 1/2/3 -> recv 3 packets
ping -c 4/5/6 -> recv 6 packets
ping -c 7 -> recv 8 packets
Thanks & your help is greatly appreciated !
Zi
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ZI> After I configure the ethernet interface(it's a PCI card
ZI> plugged in my debian PC), I run command ' ping -c 1
ZI> 192.168.0.100', (the interface is configured with IP address
ZI> 192.168.0.35), I used smartbit to look at the wire and found 3
ZI> ping packets. From the debugging info, I can see
ZI> dev->hard_start_xmit is called three times, the DMA engine
ZI> seems to be acting correctly, and each time hard_start_xmit is
ZI> invoked the skb address is different. How can this happen?
Are any of the 3 packets actually arp packets?
- Roland
>
> Are any of the 3 packets actually arp packets?
>
> - Roland
Yes, they are arp packets and are exactly the same.
Zi
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