Hi Andrew, > > (A side question - DSA uses switchdev, so when one shall use > > switchdev standalone?) > > DSA gives you a framework for an Ethernet switch connected to a host > via Ethernet for the data plane. Generally, that Ethernet link to the > switch is a MAC to MAC connection. It can be PHY to PHY. But those are > just details. The important thing is you use an Ethernet driver on the > host. > > If you look at pure switchdev devices, they generally DMA frames > directly into the switch. There is either one DMA queue per switch > port, or there is a way to multiplex frames over one DMA queue, > generally by additional fields in the buffer descriptor. > > For this device, at the moment, it is hard to say which is the best > fit. A lot will depend on how the FEC driver works, if you can reuse > it, while still having the degree of control you need over the DMA > channel. If you can reuse the FEC driver, then a DSA driver might > work. If the coupling it too loose, and you have to take control of > the DMA, then a pure switchdev driver seems more appropriate. > > Andrew >
Thanks for the detailed explanation. Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lu...@denx.de
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