2 messages, 2 authors, 2002-11-20 · open the first message on its own page
From: Seong Moon <hidden>
Date: 2002-11-20 02:46:20
In Layer 3 Protocols(eg. IP, IPv6, ...), they calls dev_queue_xmit() to send their data. Before calling dev_queue_xmit(), does the layer 3 protocols always call dev->hard_header ? Actually, I'm not sure when dev->hard_header is called. I think dev->hard_start_xmit can include the part of dev->hard_header. Why did the developer seperate the header building and sending frame fucntion ? thanks in advance.
From: Ben Greear <hidden>
Date: 2002-11-20 05:06:01
Seong Moon wrote:
In Layer 3 Protocols(eg. IP, IPv6, ...), they calls dev_queue_xmit() to send their data. Before calling dev_queue_xmit(), does the layer 3 protocols always call dev->hard_header ? Actually, I'm not sure when dev->hard_header is called. I think dev->hard_start_xmit can include the part of dev->hard_header. Why did the developer seperate the header building and sending frame fucntion ?
It's not always called, this way user-space (or other parts of the kernel) can build the headers if desired. This at least works for ethernet and VLAN interfaces. Ben
thanks in advance.
-- Ben Greear [off-list ref] <Ben_Greear AT excite.com> President of Candela Technologies Inc http://www.candelatech.com ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear