On Thu, Nov 09, 2017 at 03:03:16PM -0800, Florian Fainelli wrote: > 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.
Hi Florian Ah, so maybe when the tag is stripped off it then becomes a runt packet and so gets dropped. Andrew
