MT7621 raeth tx/rx fail if enable HW_TSO

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What steps will reproduce the problem?
1.Use MT7621 raeth Enable HW_TSO
2. Android phone play video on minidlna about half an hour,then all ethernet 
not work,ping is unreachable
3. Disabke HW_TSO in raerh then problem fixed.

What is the expected output? What do you see instead?
no 

What version of the product are you using? On what operating system?
netgear R6220

Please describe the problem as detailed as it's possible.
If you have connection problem, then syslog file is required. (please do
attach it as a file)
Note that if there will be a poor problem description the issue status will
be changed to 'Invalid'!

Original issue reported on code.google.com by lintel.h...@gmail.com on 13 Jul 2015 at 3:09

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No issue in MTK SDK4320

Original comment by lintel.h...@gmail.com on 14 Jul 2015 at 5:27

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MT7621A/S rev 0103 work perfectly with TSOv4/TSOv6. 

All fixes from SDK4320 already included. 

Original comment by andy.pad...@gmail.com on 17 Jul 2015 at 4:28

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MT7621A/S rev0103, QDMA port with TSO is 100% works. 

Tested 3 hours + hard case: transmission to cifs share.

QDMA tx_ring txd_info4 dump look like 0xf2000000, TSO bit is set.

Original comment by andy.pad...@gmail.com on 17 Jul 2015 at 9:29

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hello,andy

pls try samba r/w with two pair,
one for read,and the other for write,
after about an hour later,MT7621 CPU halted.

Original comment by lintel.h...@gmail.com on 18 Jul 2015 at 7:06

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MT7620 rev < 0205 has bug with TSO, Frame Engine really hungs (after 1-3 min on 
SMB/FTP copy). Not CPU. After reset FE via reg 0x34, FE works again.

-
To more complexity testing, I need sample MT7621 with USB3. Now I used Buffalo 
WSR-1166DHP, this is fairy router on MT7621A + DDR3, but not have USB ports. 

Early, I worked with R6220 (and full adapted this firmware, only Uboot replace 
needed), but I already gave back R6220 to owner.

Original comment by andy.pad...@gmail.com on 18 Jul 2015 at 8:15