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guk
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Posts: 19
Joined: Mon May 25, 2009 3:34 pm

HW Offload drops packets

Thu Nov 15, 2018 2:59 am

Hello,

I have many RB951UI-2HnD

after changing to bridge + hw offload setting during the recent cfg change instead of master-port settings packets gets dropped:

all ports lan + wlan in 1 bridge

packet from wlan to uplink ok
packet via bridge (ether2) out ok
return packet via bridge received ok
return packet to wlan missing


i had to adjust my cfg to disable hw offload to get it working again:

/interface bridge
add fast-forward=no name=my_bridge

/interface bridge port
add bridge=my_bridge interface=wlan1
add bridge=my_bridge interface=ether1
add bridge=my_bridge comment=uplink--no-HW-OFFLOAD hw=no interface=ether2-uplink
add bridge=my_bridge interface=ether3
add bridge=my_bridge interface=ether4
add bridge=my_bridge interface=ether5

is this a bug or by design?
 
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sebastia
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Re: HW Offload drops packets

Sat Nov 17, 2018 2:16 am

hi

wlan is not part of the hw bridge/switch, see Image

hence, bridging it all will not work in hardware
 
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mkx
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Re: HW Offload drops packets

Sat Nov 17, 2018 5:28 pm

It shouldn't be necessary to force all traffic from one ether port to go through RB's CPU to get (some of) it to wlan interface (that's what setting hw=no on given ether port is all about). I can think of only one reason why the workaround fixes the problem: somehow MAC of wifi-client stays in the switch MAC table for a wired port and outgoing frame gets transmited over wrong ether port while it should have been passed to RB's CPU.

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