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gnu_linux: MMAP cannot handle properly VLANs (including MTU) #9

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msune opened this issue May 14, 2014 · 2 comments
Open

gnu_linux: MMAP cannot handle properly VLANs (including MTU) #9

msune opened this issue May 14, 2014 · 2 comments
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bug gnu-linux wontfix
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Unscheduled

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@msune
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msune commented May 14, 2014

There seems to be two different issues with PF_PACKET TX/RX rings:

  • There is no proper way to recover the ether_type of the original frame from the struct tpacket2_hdr, so only 0x8100 can be assumed
  • TX ring does not handle properly MTU with VLANs; e.g. with an MTU of 1500, only up to 1514 packets are accepted instead of 1518.
@msune msune added bug labels May 14, 2014
@msune msune changed the title ioport_mmap cannot handle properly VLANs (including MTU) gnu_linux::ioport_mmap cannot handle properly VLANs (including MTU) May 14, 2014
@msune msune added this to the Unscheduled milestone May 21, 2014
@msune msune added the wontfix label May 21, 2014
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msune commented May 21, 2014

Marking as won't fix, as apparently there is no proper way of doing it in PACKET_MMAP. Leaving issue open for reference.

This was referenced Jul 31, 2014
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msune commented Mar 1, 2015

More information here: http://pdos.csail.mit.edu/pipermail/click/2007-February/005675.html

msune pushed a commit to msune/xdpd that referenced this issue May 12, 2015
Adding .travis.yml; checking if it times out bisdn#9
7774671
@msune msune changed the title gnu_linux::ioport_mmap cannot handle properly VLANs (including MTU) gnu_linux:: MMAP cannot handle properly VLANs (including MTU) Jul 28, 2015
@msune msune changed the title gnu_linux:: MMAP cannot handle properly VLANs (including MTU) gnu_linux: MMAP cannot handle properly VLANs (including MTU) Jul 28, 2015
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