On 05.12.20 04:44, Jakub Kicinski wrote:
On Fri, 4 Dec 2020 14:35:08 +0100 Marc Kleine-Budde wrote:
From: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
When CAN_ISOTP_SF_BROADCAST is set in the CAN_ISOTP_OPTS flags the CAN_ISOTP
socket is switched into functional addressing mode, where only single frame
(SF) protocol data units can be send on the specified CAN interface and the
given tp.tx_id after bind().
In opposite to normal and extended addressing this socket does not register a
CAN-ID for reception which would be needed for a 1-to-1 ISOTP connection with a
segmented bi-directional data transfer.
Sending SFs on this socket is therefore a TX-only 'broadcast' operation.
Unclear from this patch what is getting fixed. Looks a little bit like
a feature which could be added in a backward compatible way, no?
Is it only added for completeness of the ISOTP implementation?
Yes, the latter.
It's a very small and simple tested addition and I hope it can still go
into the initial upstream process.
Many thanks,
Oliver
