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To: ecos-bugs@sources.redhat.com
Subject: [Bug 1000347]  New: FreeBSD Network Thread misses incoming packet enque in ether_demux
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Date: Sat, 09 Dec 2006 21:09:00 -0000
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http://bugzilla.ecoscentric.com/show_bug.cgi?id=1000347

           Summary: FreeBSD Network Thread misses incoming packet enque in
                    ether_demux
           Product: eCos
           Version: unknown
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: high
         Component: TCPIP
        AssignedTo: gary@mlbassoc.com
        ReportedBy: bugzilla_rmvthis@ds3switch.com
         QAContact: ecos-bugs@sources.redhat.com


If the priority of the ethernet driver thread is lower (higher #) than the FreeBSD Network Thread, then the Network Thread can get prematurely woken up to process an incoming ethernet pkt before the packet is fully enqued.  Specifically:

if_ethersubr:ether_demux() calls schednetisr() (which wakes up network thread) prior to the pkt being enqued with that call to IF_ENQUEUE().

This might not be obvious because a subsequent incoming packet can (partially) process the queue.

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