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Old 04-15-2009, 04:07 AM   #1
Registered: Jun 2008
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when sk_buff is allocated while sending packaet

When a frame is received at NIC, interrupt handler of NIC , allocate sk_buff struct and copy data from Device to struct.
When I send packet (using send function of socket), where this struct is initialized and who allocate this struct....

Old 04-16-2009, 08:44 PM   #2
Registered: May 2007
Location: New Zealand
Distribution: Ubuntu
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I'm not sure exactly where, but the driver receives the skb from the upper layers - so somewhere up there
Old 04-17-2009, 09:37 PM   #3
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UDP ip_append_data() user data is copied to SKB
TCP do_tcp_sendpages() user data is copied to SKB
sendfile ip_append_page() zero copy. Update SKB pointers to user data.

They are in L4 layer and sit under net/ipv4 (or ipv6). SKBs are pushed down to L3 IP later.

Last edited by titan22; 04-17-2009 at 09:44 PM.


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