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


From: Tobias Fiebig
Subject: RE: [PATCH for-7.2] rtl8139: honor large send MSS value
Date: Wed, 16 Nov 2022 12:20:23 +0100

Heho,
Quick follow-up; Applied the change you suggested, but there are still some 
things to test.

While this now works (mostly), MSS values are still off; Especially the 
behavior below <=1036 is difficult, as for v4 the minimum MTU is 576 and 
minimum MSS is 536:

Requested    DPRINT
1320              1292
1319              1291
1100              1024
1036              1024
1035                271
1000                268

So, I guess there is something else amiss; Will test more in-depth later 
tonight and shift the bits a bit; Also, I will look into behavior when forcing 
>1500 MTUs (in case that works with the rtl8139).

Sidenote: This all seems to be a non-issue for v6, as the RTL8139 does not 
support TSO for v6, so at least one thing less to worry about. ;-)

With best regards,
Tobias




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