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Toke Høiland-Jørgensen dfcb63ce1d fq_codel: generalise ce_threshold marking for subset of traffic Commit `e72aeb9ee0` ("fq_codel: implement L4S style ce_threshold_ect1 marking") expanded the ce_threshold feature of FQ-CoDel so it can be applied to a subset of the traffic, using the ECT(1) bit of the ECN field as the classifier. However, hard-coding ECT(1) as the only classifier for this feature seems limiting, so let's expand it to be more general. To this end, change the parameter from a ce_threshold_ect1 boolean, to a one-byte selector/mask pair (ce_threshold_{selector,mask}) which is applied to the whole diffserv/ECN field in the IP header. This makes it possible to classify packets by any value in either the ECN field or the diffserv field. In particular, setting a selector of INET_ECN_ECT_1 and a mask of INET_ECN_MASK corresponds to the functionality before this patch, and a mask of ~INET_ECN_MASK allows using the selector as a straight-forward match against a diffserv code point: # apply ce_threshold to ECT(1) traffic tc qdisc replace dev eth0 root fq_codel ce_threshold 1ms ce_threshold_selector 0x1/0x3 # apply ce_threshold to ECN-capable traffic marked as diffserv AF22 tc qdisc replace dev eth0 root fq_codel ce_threshold 1ms ce_threshold_selector 0x50/0xfc Regardless of the selector chosen, the normal rules for ECN-marking of packets still apply, i.e., the flow must still declare itself ECN-capable by setting one of the bits in the ECN field to get marked at all. v2: - Add tc usage examples to patch description Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/20211019174709.69081-1-toke@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2021-10-20 15:24:36 -07:00
arch
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Documentation	dt-bindings: net: dsa: sja1105: add {rx,tx}-internal-delay-ps	2021-10-20 11:32:28 +01:00
drivers	phy: micrel: ksz8041nl: do not use power down mode	2021-10-20 14:38:12 +01:00
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include	fq_codel: generalise ce_threshold marking for subset of traffic	2021-10-20 15:24:36 -07:00
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net	fq_codel: generalise ce_threshold marking for subset of traffic	2021-10-20 15:24:36 -07:00
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tools	selftests: mlxsw: Add a test for un/offloadable qdisc trees	2021-10-19 12:24:52 +01:00
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MAINTAINERS	MAINTAINERS: adjust file entry for of_net.c after movement	2021-10-18 14:19:49 -07:00
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README

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.