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35 lines
1.4 KiB
Diff
35 lines
1.4 KiB
Diff
From 3983dc1674fec43beb8ce9d9bfdd6302fef86eae Mon Sep 17 00:00:00 2001
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From: Andrew MacIntyre <andymac@pcug.org.au>
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Date: Mon, 4 Nov 2024 22:41:25 +1100
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Subject: [PATCH] vrx518_tc: allow larger MTU to support RFC4638
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vrx518_tc currently sets the interface maximum MTU to the ethernet default
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of 1500 bytes by default via ether_setup() called from ptm_setup().
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To support 1508 byte baby jumbo frames (RFC4638) for PPPoE connections
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over VDSL links as already supported by the VR9 ltq_ptm driver ([1], [2])
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set the interface maximum MTU to MAX_MTU.
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MAX_MTU is defined in dcdp/inc/tc_common.h to 2002 bytes and this value is
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used in ptm_change_mtu() and elsewhere as the maximum MTU, however this is
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short circuited by checks against the interface maximum MTU.
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[1]: https://forum.openwrt.org/t/fritzbox-7530-and-rfc4638-baby-jumbo-frames/181327
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[2]: https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=8a2a20e71e2909f84dab47e51dfda9e292a6c1ae
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Signed-off-by: Andrew MacIntyre <andymac@pcug.org.au>
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---
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dcdp/ptm_tc.c | 1 +
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1 file changed, 1 insertion(+)
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--- a/dcdp/ptm_tc.c 2023-12-17 16:11:22.503500398 +1100
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+++ b/dcdp/ptm_tc.c 2024-01-26 16:48:49.881623474 +1100
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@@ -657,6 +657,7 @@ static void ptm_setup(struct net_device
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ether_setup(dev);
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dev->watchdog_timeo = 10 * HZ;
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dev->netdev_ops = &g_ptm_netdev_ops;
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+ dev->max_mtu = MAX_MTU;
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}
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static int ptm_dev_init(struct tc_priv *tc_priv, u32 id,
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