This patch series implements support for Tx queue selection based on Rx queue(s) map. This is done by configuring Rx queue(s) map per Tx-queue using sysfs attribute. If the user configuration for Rx queues does not apply, then the Tx queue selection falls back to XPS using CPUs and finally to hashing.
XPS is refactored to support Tx queue selection based on either the CPUs map or the Rx-queues map. The config option CONFIG_XPS needs to be enabled. By default no receive queues are configured for the Tx queue. - /sys/class/net/<dev>/queues/tx-*/xps_rxqs This is to enable sending packets on the same Tx-Rx queue pair as this is useful for busy polling multi-threaded workloads where it is not possible to pin the threads to a CPU. This is a rework of Sridhar's patch for symmetric queueing via socket option: https://www.spinics.net/lists/netdev/msg453106.html v2: - Added documentation in networking/scaling.txt - Added a simple routine to replace multiple ifdef blocks. --- Amritha Nambiar (4): net: Refactor XPS for CPUs and Rx queues net: Enable Tx queue selection based on Rx queues net-sysfs: Add interface for Rx queue map per Tx queue Documentation: Add explanation for XPS using Rx-queue map Documentation/networking/scaling.txt | 58 +++++++- include/linux/cpumask.h | 11 +- include/linux/netdevice.h | 72 ++++++++++ include/net/sock.h | 18 +++ net/core/dev.c | 242 +++++++++++++++++++++++----------- net/core/net-sysfs.c | 85 ++++++++++++ net/core/sock.c | 5 + net/ipv4/tcp_input.c | 7 + net/ipv4/tcp_ipv4.c | 1 net/ipv4/tcp_minisocks.c | 1 10 files changed, 404 insertions(+), 96 deletions(-) --
