On Mon, Dec 15, 2014 at 10:20 PM, Helmut Sim <simhelmut at gmail.com> wrote: > > Hi, > > While working on TSO based solution I faced the following two questions: > > 1. > is there a maximum pkt_len to be used with TSO?, e.g. let's say if seg_sz > is 1400 can the entire segmented pkt be 256K (higer than 64K) ?, then the > driver gets a list of chanined mbufs while the first mbuf is set to TSO > offload. >
TSO segments a TCP packet into mtu sied bits. The TCP/IP protocols are limited to 64K due to the length fields being 16bit wide. You can't build a valid packet longer then 64K regardless of the NIC. > 2. > I wonder, Is there a specific reason why TSO is supported only for IXGBE > and not for IGB ? the 82576 NIC supports TSO though. > Is it due to a kind of tecnical barrier or is it because of priorities? > > It will be great if someone from the forum could address this. > > Thanks, > Sim >
