Document tunable dev.sis.%unit.manual_pad
While I'm here Xref vlan(4) as sis(4) supports VLAN oversized frames.
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@ -30,7 +30,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 28, 2006
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.Dd September 2, 2010
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.Dt SIS 4
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.Os
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.Sh NAME
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@ -145,6 +145,22 @@ SiS 630, 635, and 735 motherboard chipsets
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.It
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Soekris Engineering net45xx, net48xx, lan1621, and lan1641
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.El
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.Sh SYSCTL VARIABLES
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The following variable is available as both
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.Xr sysctl 8
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variable and
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.Xr loader 8
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tunable:
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.Bl -tag -width indent
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.It Va dev.sis.%unit.manual_pad
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This variable controls how to pad short frames for DP83815/DP83816
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controllers on the specified device.
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DP83815/DP83816 controllers are known to pad 0xFF for short frames
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which is violation of RFC 1042.
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A non-zero value have driver manually pad zeros for short frames
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with the cost of extra CPU cycles.
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The default valus is 0 to let hardware automatically pad short frames.
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.El
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "sis%d: couldn't map ports/memory"
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@ -190,6 +206,7 @@ the card should be configured correctly.
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.Xr netintro 4 ,
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.Xr ng_ether 4 ,
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.Xr polling 4 ,
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.Xr vlan 4 ,
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.Xr ifconfig 8
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.Rs
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.%T SiS 900 and SiS 7016 datasheets
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