[FS#4116] qca9560-eth supports jumbo frames but is limited to 1516

OpenWrt Bugs openwrt-bugs at lists.openwrt.org
Sat Oct 30 05:18:34 PDT 2021


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The following task has a new comment added:

FS#4116 - qca9560-eth supports jumbo frames but is limited to 1516
User who did this - Geoffrey McRae (gnif)

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Correction, the limit of 1516 is caused by the following code:

dev->max_mtu = max_frame_len - ag71xx_max_frame_len(0);

static inline unsigned int ag71xx_max_frame_len(unsigned int mtu)
{
	return ETH_SWITCH_HEADER_LEN + ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
}

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4116#comment10255

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