--------------------------------------------------
From: "Jürgen Lambrecht" <[EMAIL PROTECTED]>
Sent: Wednesday, March 26, 2008 8:30 PM
To: "venice" <[EMAIL PROTECTED]>; <[email protected]>
Subject: Re: [ECOS] How does the freebsd socket call the drivers?
venice wrote:
Hi, I'm writing a net driver and I have a driver template to do that
but I still do not know how the applications call the drivers through
the freebsd stack. So can you explain the calling functions of the
freebsd stack to the drivers?
eg:
HRDWR_send() can send data by the hardware but who will call this
function and provide the data buffer to be transported?
Your driver implements it in
ecos\packages\devs\eth\[family]\[platform]\current\src\xxx.c
There a macro fills in the function pointer HRDWR_send(), in my case
stdims_eth_send:
ETH_DRV_SC(stdims_eth_sc0,
(void*) &stdims_eth0,
"eth0",
stdims_eth_start,
stdims_eth_stop,
stdims_eth_control,
stdims_eth_can_send,
stdims_eth_send,
stdims_eth_recv,
stdims_eth_deliver,
stdims_eth_poll,
stdims_eth_intvector);
NETDEVTAB_ENTRY(stdims_eth_netdev0,
"stdims_eth0",
stdims_eth_init,
&stdims_eth_sc0);
In the documentation you can read the calling order.
Jürgen Lambrecht
Thank Jürgen. My template is something like yours', but I don't know which
function will call "stdims_eth_send"? you know the the function is
declared :
stdims_eth_send(struct eth_drv_sc *sc, struct eth_drv_sg *sg_list, int
sg_len,
int total_len, unsigned long key)
The function just sends data out by hardware, so there must be a data
buffer created by stack and if the stack want to send data it will put data
to the buffer and the will call this function.
Well, I haven't enough time to through out the source code of freebsd
stack but I think the stack will work in this way. But I don't know the
interface of the stack, maybe the data buffer? If I have more time I will
trace the stack for that.
Anyway, thanks!
Regards,
Venice
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