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Update BridgeUnix.c

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On FreeBSD the stock code will attempt to expand the interface MTU any time a packet is to be sent that exceeds the current MTU.  This results in a down/up on the interface that is wildly disruptive to existing services on that adapter and, eventually, is likely to run into MTU limits and start logging failures, even with jumbo-frame capable adapters.  Thus if compiling on a FreeBSD machine disable this capability.  Tested against 12.3-STABLE and 13.1-STABLE on v4.38-9760 from the FreeBSD ports tree but likely applies here as well; see bug report https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267178
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tickerguy 2022-10-19 12:39:32 -04:00 committed by GitHub
parent 8ae0a932da
commit 0643ae70f5
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src/Cedar/BridgeUnix.c
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@ -805,7 +805,12 @@ bool EthIsChangeMtuSupported(ETH *e)
return false; return false;
} }
// FreeBSD seriously dislikes MTU changes; disable if compiled on that platform
#ifndef __FreeBSD__
return true; return true;
#else
return false;
#endif
#else // defined(UNIX_LINUX) || defined(UNIX_BSD) || defined(UNIX_SOLARIS) #else // defined(UNIX_LINUX) || defined(UNIX_BSD) || defined(UNIX_SOLARIS)
return false; return false;
#endif // defined(UNIX_LINUX) || defined(UNIX_BSD) || defined(UNIX_SOLARIS) #endif // defined(UNIX_LINUX) || defined(UNIX_BSD) || defined(UNIX_SOLARIS)