Question on TSO/LSO Transmit Frames

[David Somayajulu]

Hi All,
Is it safe to assume that when a driver receives an Ethernet frame to transmit with CSUM_TSO bit  set in

m_head->m_pkthdr.csum_flags  ; where m_head is the first (struct mbuf) in the mbuf chain

that the [Ethernet Header] + [VLAN Tag if present] + [IP Header] + [TCP Header] are all present in one physically contiguous segment ?

In other words is

Size of ([Ethernet Header] + [VLAN Tag if present] + [IP Header] + [TCP Header]) <= m_head->m_len

When ((m_head->m_pkthdr.csum_flags   & CSUM_TSO) != 0)

Thanks
David S.


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