On 06/13/2018 04:37 PM, Mark Jonas wrote: > From: Zhu Yi <yi.zhu5@xxxxxxxxxxxx> > > The existing SocketCAN implementation provides alloc_candev() to > allocate a CAN device using a single Tx and Rx queue. This can lead to > priority inversion in case the single Tx queue is already full with low > priority messages and a high priority message needs to be sent while the > bus is fully loaded with medium priority messages. > > This problem can be solved by using the existing multi-queue support of > the network subsytem. The commit makes it possible to use multi-queue in > the CAN subsystem in the same way it is used in the Ethernet subsystem > by adding an alloc_candev_mqs() call and accompanying macros. With this > support a CAN device can use multi-queue qdisc (e.g. mqprio) to avoid > the aforementioned priority inversion. > > The exisiting functionality of alloc_candev() is the same as before. > > CAN devices need to have prioritized multiple hardware queues or are > able to abort waiting for arbitration to make sensible use of > multi-queues. > > Signed-off-by: Zhu Yi <yi.zhu5@xxxxxxxxxxxx> > Signed-off-by: Mark Jonas <mark.jonas@xxxxxxxxxxxx> > Reviewed-by: Heiko Schocher <hs@xxxxxxx> Applied to linux-can-next. Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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