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Tony Nguyen says:
====================
100GbE Intel Wired LAN Driver Updates 2021-10-20
Sudheer Mogilappagari says:
This series introduces initial support for Application Device Queues(ADQ)
in ice driver. ADQ provides traffic isolation for application flows in
hardware and ability to steer traffic to a given traffic class. This
helps in aligning NIC queues to application threads.
Traffic classes are configured using mqprio framework of tc command
and mapped to HW channels(VSIs) in the driver. The queue set of each
traffic class is managed by corresponding VSI. Each traffic channel
can be configured with bandwidth rate-limiting limits and is offloaded
to the hardware through the mqprio framework by specifying the mode
option as 'channel' and shaper option as 'bw_rlimit'.
Next, the flows of application can be steered into a given traffic class
using "tc filter" command. The option "skip_sw hw_tc x" indicates
hw-offload of filtering and steering filtered traffic into specified TC.
Non-matching traffic flows through TC0.
When channel configuration are removed queue configuration is set to
default and filters configured on individual traffic classes are deleted.
example:
$ ethtool -K eth0 hw-tc-offload on
Configure 3 traffic classes and map priority 0,1,2 to TC0, TC1 and TC2
respectively. TC0 has 2 queues from offset 0 & TC1 has 8 queues from
offset 2 and TC2 has 4 queues from offset 10. Enable hardware offload
of channels.
$ tc qdisc add dev eth0 root mqprio num_tc 3 map 0 1 2 queues \
2@0 8@2 4@10 hw 1 mode channel
$ tc qdisc show dev eth0
qdisc mqprio 8001: root tc 2 map 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0
queues:(0:1) (2:9) (10:13)
mode:channel
Configure two filters to match based on dst ipaddr, dst tcp port and
redirect to TC1 and TC2.
$ tc qdisc add dev eth0 clsact
$ tc filter add dev eth0 protocol ip ingress prio 1 flower\
dst_ip 192.168.1.1/32 ip_proto tcp dst_port 80\
skip_sw hw_tc 1
$ tc filter add dev eth0 protocol ip ingress prio 1 flower\
dst_ip 192.168.1.1/32 ip_proto tcp dst_port 5001\
skip_sw hw_tc 2
$ tc filter show dev eth0 ingress
Delete traffic classes configuration:
$ sudo tc qdisc del dev eth0 root
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.