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<p class=MsoNormal><span lang=EN-US>HI All:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US> As the title. I
saw someone mentioned that NIC should support S/G DMA, TCP checksum offload and
auto insert IP header,TCP header. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>The S/G DMA is easy to understand since
large mount of data can¡¯t be allocated into one single page, but why it need
hardware to auto insert TCP header?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>As I know, the TCP header should only exist
in the first fragments, and it ¡®s already in skb->data, for other fragments,
it¡¯s in skb->frags, hardware only need to insert IP header for them, so I don¡¯t
see such need to auto insert TCP header by<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Hardware.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>And another question about checksum offload
is that, how can hardware support rx checksum verification if received packets
are fragmented?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thanks for your answer in advance.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Rick<o:p></o:p></span></p>
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