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FS#2287 - Jumbo frames not working on MT7530 #7159

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openwrt-bot opened this issue May 16, 2019 · 3 comments
Open

FS#2287 - Jumbo frames not working on MT7530 #7159

openwrt-bot opened this issue May 16, 2019 · 3 comments
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@openwrt-bot
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Porterhouse:

DISTRIB_ID='OpenWrt'
DISTRIB_RELEASE='SNAPSHOT'
DISTRIB_REVISION='r9992-86fd8cb'
DISTRIB_TARGET='ramips/mt7620'
DISTRIB_ARCH='mipsel_24kc'
DISTRIB_DESCRIPTION='OpenWrt SNAPSHOT r9992-86fd8cb'
DISTRIB_TAINTS=''

system type : MediaTek MT7620A ver:2 eco:6
machine : Edimax BR-6478AC v2
processor : 0
cpu model : MIPS 24KEc V5.0
BogoMIPS : 385.84
wait instruction : yes
microsecond timers : yes
tlb_entries : 32
extra interrupt vector : yes
hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
isa : mips1 mips2 mips32r1 mips32r2
ASEs implemented : mips16 dsp
Options implemented : tlb 4kex 4k_cache prefetch mcheck ejtag llsc pindexed_dcache userlocal vint perf_cntr_intr_bit nan_legacy nan_2008 perf
shadow register sets : 1
kscratch registers : 0
package : 0
core : 0
VCED exceptions : not available
VCEI exceptions : not available

root@ap-02:# ifconfig eth0 mtu 1500
root@ap-02:
# ifconfig eth0 mtu 1501
ifconfig: SIOCSIFMTU: Invalid argument
root@ap-02:# ifconfig eth0 mtu 9000
ifconfig: SIOCSIFMTU: Invalid argument
root@ap-02:
# ifconfig eth0 mtu 1400
root@ap-02:~#

Should support 9k frames (https://files.iczoom.com/hjiczoom/images/public/basicproduct/1478829119360_MT7530W.pdf)

@antermin
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See also #6638 - MT7621 also uses MT7530 and the "9K jumbo frame support" in the datasheet might be wrong.

@visualage
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Looks like MT7530 supports jumbo frame, but the GMAC in MT7621 only supports 2K MTU.
Reference: https://patchwork.ozlabs.org/project/lede/patch/CAAVoXJRMKCV2h1pt35hw8JSbtMHQbrAuReEpynBY6H+60GAEdQ@mail.gmail.com/

@romanrm
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romanrm commented Mar 27, 2024

GMAC fine, but it would be really useful if router could pass 9K jumbo frames unmangled between its LAN ports. So far this does not appear to be the case. Testing on a different product (Netis N6) but the SoC and switch chip seem to be the same.

Does anyone have success with Jumbo Frames in LAN on this switch?

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