[PATCH v2 0/7] net: mvneta: Switch to per-CPU irq and make rxq_def useful

From: Gregory CLEMENT
Date: Fri Sep 25 2015 - 12:10:25 EST


As stated in the first version: "this patchset reworks the Marvell
neta driver in order to really support its per-CPU interrupts, instead
of faking them as SPI, and allow the use of any RX queue instead of
the hardcoded RX queue 0 that we have currently."

Following the review which has been done, Maxime started adding the
CPU hotplug support. I continued his work a few weeks ago and here is
the result.

Since the 1st version the main change is this CPU hotplug support, in
order to validate it I powered up and down the CPUs while performing
iperf. I ran the tests during hours: the kernel didn't crash and the
network interfaces were still usable. Of course it impacted the
performance, but continuously power down and up the CPUs is not
something we usually do.

I also reorganized the series, the 3 first patches should go through
the irq subsystem, whereas the 4 others should go to the network

However, there is a runtime dependency between the two parts. Patch 5
depend on the patch 3 to be able to use the percpu irq.



PS: Thanks to Willy who gave me some pointers on how to deal with the

Maxime Ripard (7):
genirq: Fix the documentation of request_percpu_irq
irq: Export per-cpu irq allocation and de-allocation functions
irqchip: armada-370-xp: Rework per-cpu interrupts handling
net: mvneta: Fix CPU_MAP registers initialisation
net: mvneta: Handle per-cpu interrupts
net: mvneta: Allow different queues
net: mvneta: Statically assign queues to CPUs

drivers/irqchip/irq-armada-370-xp.c | 14 +-
drivers/net/ethernet/marvell/mvneta.c | 316 +++++++++++++++++++++++-----------
kernel/irq/manage.c | 9 +-
3 files changed, 226 insertions(+), 113 deletions(-)


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