Joe Damato wrote:
Add an epoll busy poll test using netdevsim.
This test is comprised of:
- busy_poller (via busy_poller.c)
- busy_poll_test.sh which loads netdevsim, sets up network namespaces, and runs busy_poller to receive data and socat to send data.
The selftest tests two different scenarios:
- busy poll (the pre-existing version in the kernel)
- busy poll with suspend enabled (what this series adds)
The data transmit is a 1MiB temporary file generated from /dev/urandom and the test is considered passing if the md5sum of the input file to socat matches the md5sum of the output file from busy_poller.
netdevsim was chosen instead of veth due to netdevsim's support for netdev-genl.
For now, this test uses the functionality that netdevsim provides. In the future, perhaps netdevsim can be extended to emulate device IRQs to more thoroughly test all pre-existing kernel options (like defer_hard_irqs) and suspend.
Signed-off-by: Joe Damato jdamato@fastly.com Co-developed-by: Martin Karsten mkarsten@uwaterloo.ca Signed-off-by: Martin Karsten mkarsten@uwaterloo.ca Acked-by: Stanislav Fomichev sdf@fomichev.me
Reviewed-by: Willem de Bruijn willemb@google.com
minor nit that ULONG_MAX can not be true with uint32_t on 64-bit platforms. Definitely no need to respin just for that.