All, So I am in the process of debugging my newly established HDLC driver. More or less modeled after a simplified gianfar / ucc_geth idea.
However, after loading, etc. and using the following commands -> insmod hdlc-8360.ko -> sethdlc hdlc0 hdlc-eth -> ifconfig hdlc0 up 192.168.1.100 All is well, and I am seeing IDL interrupts. Great. Now I go to ping an address like, ping 192.168.1.101 I can see that I get the start_xmit function, the IRQ from the QE comes back and reports the TXBD as successfully sent. Here is the problem, when I goto free the skb in the tx_handler, I get a 'Unable to Handle Kernel Paging Request for data at address 0x00000000' Even though for the life of me, I can't see any pointers that are at address zero. I have checked the pointer value I am passing in, and indeed it is the exact same pointer I am receiving from the original start-xmit call.. Are we supposed to copy the skb? And free it immediately in the start_xmit? Some special way to store the pointer? I have tried txbd->buf = skb->data; txbd->buf = virt_to_phys(skb->data); etc.. and various other ways to save that I have seen in the gianfar and ucc_geth drivers. My tx_sk_buff** is identical as alloced the same way. Anyone have any ideas? -Russ
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