Author: loos
Date: Thu Jul 3 20:16:48 2014
New Revision: 268235
URL: http://svnweb.freebsd.org/changeset/base/268235
Log:
Properly advertise that if_arge can handle long frames (if_arge is set to
handle packets up to 1536 bytes)
This fixes the need to frag that could happen when using vlans on top of
if_arge (which is a common case for the use the switch ports as individual
NICs).
Previously to this commit any vlan setup with if_arge as parent would have
the MTU of the parent interface reduced by the size of dot1q header
(4 bytes).
Tested on TP-Link 1043ND (where the WAN port is just a switch port setup to
tag packets in a different VLAN than the LAN ports).
Reported and tested by: Harm Weites (harm at weites.com)
Modified:
head/sys/mips/atheros/if_arge.c
Modified: head/sys/mips/atheros/if_arge.c
==============================================================================
--- head/sys/mips/atheros/if_arge.c Thu Jul 3 20:10:30 2014
(r268234)
+++ head/sys/mips/atheros/if_arge.c Thu Jul 3 20:16:48 2014
(r268235)
@@ -703,6 +703,9 @@ arge_attach(device_t dev)
ifp->if_snd.ifq_maxlen = ifqmaxlen;
IFQ_SET_READY(&ifp->if_snd);
+ /* Tell the upper layer(s) we support long frames. */
+ ifp->if_capabilities |= IFCAP_VLAN_MTU;
+
ifp->if_capenable = ifp->if_capabilities;
#ifdef DEVICE_POLLING
ifp->if_capabilities |= IFCAP_POLLING;
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