The following series introduces a new harware offload mode in tc/mqprio where
the TCs, the queue configurations and bandwidth rate limits are offloaded to
the hardware.
The i40e driver enables the new mqprio hardware offload mechanism factoring the
TCs, queue configuration and bandwidth rates by creating HW channel VSIs.
In this mode, the priority to traffic class mapping and the user specified
queue ranges are used to configure the traffic class when the 'hw' option is
set to 2. This is achieved by creating HW channels(VSI). A new channel is
created for each of the traffic class configuration offloaded via mqprio
framework except for the first TC (TC0) which is for the main VSI. TC0 for the
main VSI is also reconfigured as per user provided queue parameters. Finally,
bandwidth rate limits are set on these traffic classes through the mqprio
offload framework by sending these rates in addition to the number of TCs and
the queue configurations.
Example:
# tc qdisc add dev eth0 root mqprio num_tc 2 map 0 0 0 0 1 1 1 1\
queues 4@0 4@4 min_rate 0Mbit 0Mbit max_rate 55Mbit 60Mbit hw 2
To dump the bandwidth rates:
# tc qdisc show dev eth0
qdisc mqprio 804a: root tc 2 map 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0
queues:(0:3) (4:7)
min rates:0bit 0bit
max rates:55Mbit 60Mbit
---
Amritha Nambiar (4):
[next-queue]net: mqprio: Introduce new hardware offload mode in mqprio
for offloading full TC configurations
[next-queue]net: i40e: Add infrastructure for queue channel support with
the TCs and queue configurations offloaded via mqprio scheduler
[next-queue]net: i40e: Enable mqprio full offload mode in the i40e driver
for configuring TCs and queue mapping
[next-queue]net: i40e: Add support to set max bandwidth rates for TCs
offloaded via tc/mqprio
drivers/net/ethernet/intel/i40e/i40e.h | 42 +
drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 6
drivers/net/ethernet/intel/i40e/i40e_main.c | 1365 +++++++++++++++++++++---
drivers/net/ethernet/intel/i40e/i40e_txrx.h | 2
include/linux/netdevice.h | 2
include/net/pkt_cls.h | 7
include/uapi/linux/pkt_sched.h | 13
net/sched/sch_mqprio.c | 169 +++
8 files changed, 1449 insertions(+), 157 deletions(-)
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