KSZ9477 : multi_dev=1 on FEC about evb-ksz9477 HOT 4 OPEN

Please find attached :
dsti.txt

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Hi,

I am having the similar issue on iperf . Please check #77 .
Do you have a solution already?

from evb-ksz9477.

Hi @jeghub ,
Are you able to solve the crash with attached dtsi file?

from evb-ksz9477.

No. For me the device tree is not related to this bug.
For the iperf bug, see my first comment. I had error that lead to Tx_rind_dump and the crash.

I've made a change that seems to correct the first issue with iperf : in fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id), the ndev pointer is no longer use directly, a local var is use instead so ndev is not changed.
Find attached a patch for im-linux-4.14 fec_main.c : fec_main_tx_ring_dump.patch.txt

With this patch, I'm able to use iperf with the chip in multi-dev=0;

My problem is that for some application I need to have an iface for each port (that's what the driver do when set in multi-dev=1) but in this mode, I've kernel OOPS at random times. That's this issue with multi-dev=1 that I'm not able to resolve. (And I've the same issue (bad memory free that leads to kernel oops) when enabling STP in multi-dev=0 mode.

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