RE: [PATCH for-7.2] rtl8139: honor large send MSS value

["Tobias Fiebig" <tobias@fiebig.nl>]

Heho,
I just tested around with the patch;
Good news: Certainly my builds are being executed. Also, if I patch the old code to have a MAX_MTU <= the max MTU on my path, throughput is ok.

Bad news: Something is wrong with getting the MSS in the patch you shared. When enabling DPRINT, values are off (sent MSS vs. printed MSS):
600 2060
800 2308
1000 2316
1023 2307
1200 3076
1400 3340 (most likely clamped to 1320)

Fiddling around a bit more, I found txdw0 printed earlier in the stack as hex (sent MSS, txdw0):
769 900502f5
1000 900503dc
1280 900504f4
1281 900504f5
1301 90050509
1317 90050519
1320 9005051c

This maps rather well to:
MSS = txdw0 - 2416246772 
MSS = txdw0 - 9004FFF4

Sadly, my C is 'non-existent' and it is kind-of 4AM, so also not in the brainspace to fill those gaps. But if one of you could look at the patch again, that would be nice. Otherwise, I should have some brainspace for this tomorrow night (UTC) again.

With best regards,
Tobias