netdev - Fw: [Bug 103991] New: skb legth doesn't match the sum of all the fragments length

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Message-ID: <20150903103743.56271574@urahara>
Date:	Thu, 3 Sep 2015 10:37:43 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	netdev@...r.kernel.org
Subject: Fw: [Bug 103991] New: skb legth doesn't match the sum of all the
 fragments length


There is really not enough information here to make a real evaluation.
kernel is old, hardware is unspecified, and the real problem is not well
identified.


Begin forwarded message:

Date: Thu, 3 Sep 2015 10:51:44 +0000
From: "bugzilla-daemon@...zilla.kernel.org" <bugzilla-daemon@...zilla.kernel.org>
To: "shemminger@...ux-foundation.org" <shemminger@...ux-foundation.org>
Subject: [Bug 103991] New: skb legth doesn't match the sum of all the fragments length


https://bugzilla.kernel.org/show_bug.cgi?id=103991

            Bug ID: 103991
           Summary: skb legth doesn't match the sum of all the fragments
                    length
           Product: Networking
           Version: 2.5
    Kernel Version: 3.13.0-62-generic
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: IPV4
          Assignee: shemminger@...ux-foundation.org
          Reporter: tht1234@...linator.com
        Regression: No

The DUT has 2 interfaces with the same 10GB Ethernet card .
The driver and H/W support TSO at 10G speed.
IP forwarding on the DUT is enabled.
Run iperf from a system connected to one interface to a system connedted to the
second interface:

      system A -------> DUT -------> system B

Watch the outgoing skbs on the DUT to system B:

  On packets with nr_frags == MAX_SKB_FRAGS (17) skb_len is *NOT* equal the
some of the skb->len - skb->data_len + all of its frag->size.

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