Hi, I have debugged the issue mentioned in the original message further and found a couple of bugs in the DPDK memif driver. There's a bug in mbuf chaining code [1] and also another bug in memif_stats_get() function [2] for which I made downstream PRs for TRex [3][4]. This is not in any way a VPP problem, but I hope if someone trying to use TRex or another DPDK app with VPP and memifs stumbles upon this message it might be of some help (as far as I know, TRex is used in VPP CSIT to some degree).
[1] https://bugs.dpdk.org/show_bug.cgi?id=729 [2] https://bugs.dpdk.org/show_bug.cgi?id=734 [3] https://github.com/cisco-system-traffic-generator/trex-core/pull/723 [4] https://github.com/cisco-system-traffic-generator/trex-core/pull/728 On Wed, Apr 21, 2021 at 5:08 PM Ivan Shvedunov via lists.fd.io <ivan4th= gmail....@lists.fd.io> wrote: > Hello, > > I've been struggling with the following issue (observed with VPP 21.01): > when trying any of ASTF TRex profiles with VPP, I get multiple errors: > "ip4 length > l2 length". > These don't happen with each packet but rather with some of them. It looks > like the TCP payload is truncated down to 600 bytes for some reason, while > looking at the TRex simulation, it should be 1448 bytes. > I have collected a snippet from dispatch trace dissected by Wireshark > and other info here: > https://gist.github.com/ivan4th/e0130dac619f91a6bb8e7987550c2466 > I'm not really sure this is VPP and not a TRex issue, especially given > that it's only seen in ASTF mode of TRex, but I'm asking it here b/c > (1) TRex is used for CSIT > (2) There's an old open ticket for a similar CSIT problem: > https://jira.fd.io/browse/VPP-1676 > Not sure if it was resolved somehow already. > > Passing --tso-disable --lro-disable --checksum-offload-disable flags to > TRex doesn't change anything. > > If there's no known solution for this issue, I'll dig into it myself, > but I'd like to ask if maybe it was already solved by someone. Thanks! > > -- > Ivan Shvedunov <ivan...@gmail.com> > ;; My GPG fingerprint is: 2E61 0748 8E12 BB1A 5AB9 F7D0 613E C0F8 0BC5 > 2807 > > > > -- Ivan Shvedunov <ivan...@gmail.com> ;; My GPG fingerprint is: 2E61 0748 8E12 BB1A 5AB9 F7D0 613E C0F8 0BC5 2807
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