On 11/09/2017 02:37 PM, Andrew Lunn wrote: > On Thu, Nov 09, 2017 at 02:26:04PM -0800, Florian Fainelli wrote: >> In preparation for enabling Broadcom tags with b53, pad packets to a >> minimum size of 64 bytes (sans FCS) in order for the Broadcom switch to >> accept ingressing frames. Without this, we would typically be able to >> DHCP, but not resolve with ARP because packets are too small and get >> rejected by the switch. > > Hi Florian > > Is the MAC sending runt packets in its default configuration? Is this > a general issue, and not just an issue when there is a switch directly > attached?
The MAC is sending 64 bytes (with FCS) padded packets by default, but this apparently gets mis-calculated when Broadcom tags are enabled, such that we need to pad before to avoid that. -- Florian
