Very Computer

by **Fernando Orteg** » Sat, 28 Aug 1999 04:00:00

I need to know how the networking manages to get data from a process
and passes it to the sk_buff struct , so that, this is the struct used to
pass the data to the devices(for example to Ethernet).

I know the last call made , before passing the data to the device is:

dev->hard_start_xmit(skb,dev)

but which is the way data get into skb?

I mean,

How many packets for each skb? ----> It depends? , What about?
How many priority queue buffers per device? ----> 3?

So, as you can see I am a bit lost.
If you know any thing, that helps, please let me know.

Any help will be wellcome.

Thanks in advance

--
Fernando Ortega Bellosta

by **Joy** » Sun, 29 Aug 1999 04:00:00

> I need to know how the networking manages to get data from a process
> and passes it to the sk_buff struct , so that, this is the struct used to
> pass the data to the devices(for example to Ethernet).

> I know the last call made , before passing the data to the device is:

> dev->hard_start_xmit(skb,dev)

> but which is the way data get into skb?

> I mean,

> How many packets for each skb? ----> It depends? , What about?
> How many priority queue buffers per device? ----> 3?

> So, as you can see I am a bit lost.
> If you know any thing, that helps, please let me know.

> Any help will be wellcome.

> Thanks in advance

> --
> Fernando Ortega Bellosta

the data is copied from user space to kernel space using memcpy_from_fs.
Actually fs is the segment reg pointing to user segment. After copying to
kernel space the data is packed in skbuffs( simplistic description ).

bye

Joy

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Very Computer

Struct SK_BUFF(Networking code)

Struct SK_BUFF(Networking code)

Struct SK_BUFF(Networking code)