Question on TSO/LSO Transmit Frames

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

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

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

In other words is

Size of ([Ethernet Header] + [VLAN Tag if present] + [IP Header] + [TCP Hea=
der]) <=3D m_head->m_len

When ((m_head->m_pkthdr.csum_flags   & CSUM_TSO) !=3D 0)

Thanks
David S.

This message and any attached documents contain information from QLogic Cor=
poration or its wholly-owned subsidiaries that may be confidential. If you =
are not the intended recipient, you may not read, copy, distribute, or use =
this information. If you have received this transmission in error, please n=
otify the sender immediately by reply e-mail and then delete this message.

_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"