> On 25 Oct 2016, at 16:31, Mike Belopuhov <m...@belopuhov.com> wrote: > > On 25 October 2016 at 08:25, Mike Belopuhov <m...@belopuhov.com> wrote: >> On 25 October 2016 at 02:34, David Gwynne <da...@gwynne.id.au> wrote: >>>> I see. I will double check this tomorrow but your approach >>>> looks solid. >>> >>> it's obviously an interaction between intel nics that do not align >>> their ethernet headers correctly, and the M_PREPEND which i just >>> changed (and you oked) in src/sys/net/if_ethersubr.c r1.240). >>> >>> basically the stack strips the 6 byte ethernet header before pushing >>> the packet into the ip stack, and forwarding causes it to be output >>> as an ethernet packet. the M_PREPEND of 8 bytes in ether_output >>> causes an mbuf to be prefixed cos the frame has 6 bytes free, not >>> 8. >>> >> >> Ah right, it's the same cluster we're transmitting as we have Rx'ed... >> > > You need to get your mcl2k2 change in then.
ill put it in tonight. cheers, dlg > >>> the good news is that at least the prepended mbuf gets its ethernet >>> header correctly aligned. >>> >>> dlg
