mpc52xx: Correct calculation of FEC RX errors???

Miguel Angel Alvarez ma.alvarez at
Wed Jul 18 21:39:47 EST 2007


We are showing figures of more than 4 billion error frames in our 
ethernet interfaces. We have tested that the problem is in a 
substraction (the number of errors decrements with the number of frames).

So... looking in the fec driver (fec.c) for the calculations we have 
seen that the number of multicast packets is added to the number of 
correct frames in order to get the frame errors...

But the interesting thing is that we have checked that this calculation 
is something that we have added with a patch by Grzegorz Bernacki in 
this list.

So... The funny thing is... Why a patch that solves the problem for 
Grzegorz produces "the same problem" for us?

And... by the way... I have seen IEEE802.3, and when they talk about 
aFramesReceivedOK (which I suppose is the ieee_r_frame_ok in the 
driver), and they do not say a word about not including multicast 
packets in it...

Any comment will be appreciate.

Miguel Ángel Álvarez
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