Difference between revisions of "Llk-packet-diagram"

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<div style="position: relative">[[Image:packet-diagram.png]]
 
<div style="position: relative">[[Image:packet-diagram.png]]
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<div style="position: absolute; left: 180px; top: 67px">[[#1]]</div>
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<div style="position: absolute; left: 420px; top: 67px">[[#2]]</div>
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<div style="position: absolute; left: 660px; top: 67px">3</div>
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<div style="position: absolute; left: 660px; top: 67px">[[#3]]</div>
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<div style="position: absolute; left: 900px; top: 67px">[[#4]]</div>
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<div style="position: absolute; left: 1100px; top: 67px">[[#5]]</div>
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<div style="position: absolute; left: 1100px; top: 310px">[[#6]]</div>
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<div style="position: absolute; left: 900px; top: 310px">[[#7]]</div>
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<div style="position: absolute; left: 660px; top: 310px">[[#8]]</div>
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<div style="position: absolute; left: 420px; top: 310px">[[#9]]</div>
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<div style="position: absolute; left: 180px; top: 310px">[[#10]]</div>
  
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</div>
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<div id="1">
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1.  Timer location: net/socket.c:1551, sys_send. 
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Data is copied from user to kernel space via copy_from_user.
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</div>
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<div id="2">
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2.  Timer location: net/ipv4/af_inet.c:661, inet_sendmsg. 
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Kernel buffer is wrapped into a BSD socket data structure.
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</div>
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<div id="3">
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3.  Timer location: net/ipv4/tcp_output.c:374, tcp_transmit_skb.
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TCP wrapper placed around data.
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</div>
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<div id="4">
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4.  Timer location: net/ipv4/ip_output.c:240, ip_finish_output.
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IP wrapper placed around data.
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</div>
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<div id="5">
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5.  Timer location: net/ipv4/ip_output.c:224, tp_hard_start_xmit.
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Data is copied from kernel memory to card memory and transmitted over the line.  This begins in hard_start_xmit, which is a function defined by the driver.
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</div>
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<div id="6">
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6.  Timer location: net/core/dev.c:1843,1849, process_backlog. 
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Data is taken from line to card memory by driver then copied from card memorty to kernel memory via skb buffer dequeuing (skb_dequeue).
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</div>
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<div id="7">
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7.  Timer location: net/ipv4/ip_input.c:293, ip_rcv_finish. 
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</div>
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<div id="8">
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8.  Timer location: net/ipv4/tcp_ipv4.c:1744, tcp_v4_rcv. 
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</div>
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<div id="9">
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9.  Timer location: net/ipv4/tcp_input.c:4362,4398,4449, tcp_rcv_established. 
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</div>
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<div id="10">
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10.  Timer location:  net/socket.c:1601, sys_recvfrom. 
 
</div>
 
</div>

Latest revision as of 12:45, 11 October 2005

Packet-diagram.png


1. Timer location: net/socket.c:1551, sys_send. Data is copied from user to kernel space via copy_from_user.

2. Timer location: net/ipv4/af_inet.c:661, inet_sendmsg. Kernel buffer is wrapped into a BSD socket data structure.

3. Timer location: net/ipv4/tcp_output.c:374, tcp_transmit_skb. TCP wrapper placed around data.

4. Timer location: net/ipv4/ip_output.c:240, ip_finish_output. IP wrapper placed around data.

5. Timer location: net/ipv4/ip_output.c:224, tp_hard_start_xmit. Data is copied from kernel memory to card memory and transmitted over the line. This begins in hard_start_xmit, which is a function defined by the driver.

6. Timer location: net/core/dev.c:1843,1849, process_backlog. Data is taken from line to card memory by driver then copied from card memorty to kernel memory via skb buffer dequeuing (skb_dequeue).

7. Timer location: net/ipv4/ip_input.c:293, ip_rcv_finish.

8. Timer location: net/ipv4/tcp_ipv4.c:1744, tcp_v4_rcv.

9. Timer location: net/ipv4/tcp_input.c:4362,4398,4449, tcp_rcv_established.

10. Timer location: net/socket.c:1601, sys_recvfrom.

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