Date: Thu, 16 Feb 2012 10:22:51 -0800 From: David Somayajulu <david.somayajulu@qlogic.com> To: "freebsd-current@freebsd.org" <freebsd-current@FreeBSD.org>, "freebsd-drivers@freebsd.org" <freebsd-drivers@freebsd.org> Subject: Question on TSO/LSO Transmit Frames Message-ID: <75E1A2A7D185F841A975979B0906BBA67C79BD85F7@AVEXMB1.qlogic.org>
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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.
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