On 1/13/21 3:35 PM, Vincent MAILHOL wrote: >> My understanding is that having a queue size being a power of two is >> required in order not to use spinlocks (else, modulo operations would >> break when the index wraparound back to zero). I tried to minimize the >> number of spinlock: only one per bulk send or bulk receive. > > Or do you mean to round up the skb_echo array length to the next power > of two in the driver despite the actual size of the device FIFO? Did > not think about that in the past but that should work. > > I am going to think a bit more of how to improve that. For the echo_skb rounding up might work, but you should round down, so that your can directly use the masked value. Marc -- Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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